CN119340573A

CN119340573A - End plate assembly, battery module, battery and electrical device

Info

Publication number: CN119340573A
Application number: CN202310896123.7A
Authority: CN
Inventors: 章华; 周新华; 彭浩然; 耿正炜; 王晓
Original assignee: Contemporary Amperex Technology Co Ltd
Current assignee: Contemporary Amperex Technology Co Ltd
Priority date: 2023-07-20
Filing date: 2023-07-20
Publication date: 2025-01-21

Abstract

An embodiment of the present application provides an end plate assembly, a battery module, a battery, and an electrical device, wherein the end plate assembly includes a first end plate and a second end plate. The first end plate includes a first plate body and two curling structures, and the two curling structures are located at opposite ends of the first plate body along a first direction. The second end plate is attached to the first plate body, and the side of the second end plate away from the first end plate is used to connect to a battery cell. The curling structure extends from the first end plate to the second end plate, and is surrounded by the first plate body to form a receiving space, at least a portion of the second end plate is located in the receiving space and attached to the first plate body, and the second end plate and at least one curling structure are abutted or gapped in the first direction, and the first direction intersects with the arrangement direction of the first end plate and the second end plate. The present application can extend the service life of the battery cell.

Description

End plate assembly, battery module, battery and power utilization device

Technical Field

The present application relates to the field of battery technology, and more particularly, to an end plate assembly, a battery module, a battery, and an electric device.

Background

Battery cells are widely used in electronic devices such as cellular phones, notebook computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy vehicles, electric toy ships, electric toy airplanes, electric tools, and the like.

In the development of battery technology, how to extend the service life of a battery cell is one research direction in battery technology.

Disclosure of Invention

The application provides an end plate assembly, a battery module, a battery and an electric device, which can prolong the service life of a battery cell.

An embodiment of the application provides an end plate assembly, which comprises a first end plate and a second end plate. The first end plate comprises a first plate body and two hemming structures, wherein the two hemming structures are positioned at two opposite ends of the first plate body along a first direction. The second end plate is attached to the first plate body, and one side, deviating from the first end plate, of the second end plate is used for being connected with the battery cell. The hemming structure extends along the direction from the first end plate to the second end plate and forms an accommodating space with the first plate body in a surrounding mode, at least part of the second end plate is located in the accommodating space and is attached to the first plate body, the second end plate abuts against or is arranged in a gap with at least one hemming structure in the first direction, and the first direction intersects with the arrangement direction of the first end plate and the second end plate.

In the above technical scheme, the second end plate can play a supporting role on at least one hemming structure in the first direction, so that deformation of the hemming structure in the first direction is reduced, and accordingly supporting capacity of the first end plate in the first direction is improved, deformation of a structure for limiting expansion, such as a limiting belt, in the arrangement direction of the first end plate and the second end plate is reduced, limiting effect of the end plate assembly on expansion of the battery cell is improved, deformation of the battery cell is reduced, and service life of the battery cell is prolonged.

In some embodiments, the second end plate includes a second plate body and a filling structure connected, the second plate body is used for fitting to the battery cell, the filling structure is disposed on one side of the second plate body facing the first end plate, at least part of the filling structure is located in the accommodating space and fitted to the first plate body, two hemming structures are located on two sides of the filling structure in the first direction, and at least one hemming structure is disposed in a manner of abutting or clearance with the filling structure in the first direction.

In the above technical scheme, the second plate body for connecting the battery cells is arranged, so that the arrangement of the filling structure can be more flexible, namely, a hollow structure can be adopted, and a solid structure or other structures can be adopted.

In some embodiments, two bead structures are disposed against or in gaps with the filler structure in a first direction, respectively.

In the above technical scheme, the filling structure can play a supporting role on the two hemming structures in the first direction, so that deformation of the hemming structures in the first direction is further reduced, supporting capacity of the first end plate in the first direction is further improved, deformation of the expansion limiting structure such as a limiting belt in the second direction of the battery module is further reduced, limiting effect of the end plate assembly on expansion of the battery is improved, deformation of the battery is reduced, and service life of the battery is prolonged.

In some embodiments, the second plate body protrudes from opposite ends of the filling structure in the first direction, and the two hemming structures are attached to and connected to opposite ends of the second plate body in the first direction.

In the above technical solution, the fastening property of the connection of the first end plate and the second end plate can be improved.

In some embodiments, the hemming structure includes a first wall, a second wall, and a third wall that are sequentially connected at an angle along a bending direction of the hemming structure, where the first wall, the second wall, and the third wall enclose a receiving cavity, the first wall and the third wall are disposed opposite along a second direction, the first wall is connected to the first plate body, one end of the third wall facing away from the second wall abuts against the filling structure or has a gap, and the second direction is parallel to an arrangement direction of the first end plate and the second end plate.

In the technical scheme, the existence of the accommodating cavity can enable the crimping structure to have better supporting force in the second direction, reduce deformation of the crimping structure in the second direction after being stressed, and have good protection effect on the battery cell. And when using spacing bringing to restrict the free inflation of battery, the limit area can be played in the second direction and support and tensioning effect to limit area, improves limit area to the free restriction effect of the free inflation of battery, reduces the free deformation of battery.

In some embodiments, the second plate body protrudes from opposite ends of the filling structure in the first direction, and the third wall is bonded and connected to the second plate body.

In the above technical solution, the fastening property of the connection between the first end plate and the second end plate can be improved by such arrangement.

In some embodiments, at least a portion of the first wall protrudes from the first plate body in a direction in which the second end plate points toward the first end plate.

In the above technical scheme, when using spacing area cooperation end plate subassembly to use, so set up, when the battery monomer takes place to expand, reducible first board body bears the local pressure that spacing area brought in the second direction, evenly transmits the pressure for first board body through the turn-up structure to further improve the homogeneity of first board body atress, reduce the deformation of first board body, improve the restriction effect of first end plate to the battery monomer expansion then, reduce battery monomer's deformation.

In some embodiments, at least a portion of the second wall protrudes from the second end plate in the first direction.

In the above technical scheme, when the limiting belt is used in cooperation with the end plate assembly, at least part of the second wall body protrudes out of the second end plate along the first direction, so that the supporting effect of the second wall body in the second direction is further improved, the pressure applied by the limiting belt to the side surface area of the die body is reduced, the protecting effect on the battery monomer is formed, and meanwhile, the limiting belt is further tensioned, so that the limiting effect of the end plate assembly on the expansion of the battery monomer is improved.

In some embodiments, the first wall and the second wall transition smoothly.

In the technical scheme, the first wall body and the second wall body are set to be in smooth transition, so that the limit belt is in contact with a smooth curved surface, and damage to the limit belt can be reduced.

In some embodiments, the hemming structure further includes at least one fourth wall connected to at least one end of the third wall in the third direction at an included angle, the fourth wall covering at least a portion of the accommodating cavity and having a first through hole through which the target connector passes, and the third direction, the first direction, and the second direction intersect two by two.

In the above technical scheme, set up the fourth wall, at the one end that sets up the fourth wall, can need not to set up other transitional coupling members on the turn-up structure, improve because the middle mechanical properties weak problem that increases transitional coupling member and lead to, the target connection piece directly pass the fourth wall can, it is comparatively convenient to use.

In some embodiments, the number of the fourth walls is two, the two fourth walls are connected to two opposite ends of the third wall in the third direction, and the two first through holes are aligned along the third direction.

In the technical scheme, the fourth wall bodies are arranged to be two, other structures are not required to be placed on the hemming structure, the problem that the middle mechanical property is weak due to the fact that the transitional connecting component is added is further improved, and the target connecting piece directly penetrates through the two fourth wall bodies to achieve locking attachment with the box body, so that the box body is convenient to use.

In some embodiments, the projection of the fourth wall onto the first wall in the third direction covers at least part of the first wall and abuts or has a gap with an end of the first wall.

In the above technical scheme, so set up, then the target connection spare is when the lock attaches, and first wall can provide the supporting role to the fourth wall to reduce the deformation of fourth wall, improve the tightness that end plate assembly and box lock attach.

In some embodiments, the endplate assembly further includes a support member at least partially positioned in the receiving cavity and coupled to the first wall and the third wall.

In the above technical scheme, when the limit belt is used in cooperation with the end plate assembly, the supporting piece is supported between the first wall body and the third wall body, so that the supporting capacity of the hemming structure in the second direction can be improved, the deformation of the hemming structure in the second direction after being stressed is reduced, the tensioning capacity of the hemming structure on the limit belt is improved, and the limiting effect of the end plate assembly on the expansion of the battery cell is improved.

In some embodiments, the support member includes a support body and protrusions disposed on two opposite sides of the support body along the second direction, the first wall and the third wall are both provided with second through holes, and the protrusions are in plug-in fit with the second through holes.

In the technical scheme, the support piece and the hemming structure are in an inserting and matching mode, so that the support piece is convenient to install and detach.

In some embodiments, when the hemming structure includes a fourth wall, the fourth wall protrudes from the first wall along the direction from the second end plate to the first end plate, the plurality of protrusions disposed on the supporting body include first protrusions, the first protrusions are in plug-in fit with the first wall and protrude from the first wall, and a spacing space for spacing the spacing belt is formed between the first protrusions and the fourth wall at intervals.

In the technical scheme, the first bulge and the fourth wall form a limiting function of the limiting belt, so that the possibility of falling off of the limiting belt is reduced.

In some embodiments, the side of the second plate body facing away from the filling structure is planar.

In the above technical scheme, set up the one side that the second board body deviates from the filling structure into the plane, the plane is more laminated with the free surface of battery, and is more fastening of connection.

In some embodiments, the filling structure includes a plurality of staggered ribs surrounding the second plate body to form a plurality of grooves opening toward the first end plate.

In the technical scheme, the filling structure is arranged into a structure form that a plurality of reinforcing ribs are mutually staggered, and a plurality of grooves are formed by surrounding the filling structure and the second plate body, so that the weight of the second end plate can be reduced, and the light-weight design is realized.

In some embodiments, the filling structure is a solid structure.

In the technical scheme, the filling structure is set to be a solid structure, so that the end plate assembly can uniformly transmit expansion-inhibiting pressure to the battery cells, the local stress of the battery cells is reduced, and the uniformity of the stress of the battery cells is improved.

In some embodiments, the first plate body has two ends opposite in a third direction, the hemming structure extending from one end of the first plate body to the other end, the first direction intersecting the third direction.

In the above technical scheme, with the hemming structure from one of them end extension to the other end of first board body, not only can improve the flexibility that spacing area position set up, moreover, the pressure that hemming structure received can directly transmit more regions of first board body, improves the restriction effect of first board body to battery cell's inflation.

In some embodiments, the first plate body includes a base plate and a first protrusion protruding from the base plate in a direction from the second end plate to the first end plate, a concave space is formed at a side of the first protrusion facing the second end plate, and the second end plate is attached to the base plate and the first protrusion.

In the above technical solution, the second end plate in the embodiment of the present application transfers the expansion force to the first end plate after receiving the expansion force of the battery cell, and the first end plate combines with other structures for limiting deformation, for example, the limiting belt limits the expansion of the battery cell via the second end plate.

In some embodiments, the number of the first protrusions is a plurality, and the plurality of first protrusions are arranged at intervals along the third direction and extend along the first direction, the third direction and the second direction intersect with the first direction in pairs, and the second direction is parallel to the arrangement direction of the first end plate and the second end plate.

In the above technical scheme, the plurality of first protruding portions are arranged at intervals along the third direction and extend along the first direction, and the substrate is also in an extending state along the first direction, so that for the battery cells arranged along the third direction at the top end and the bottom end, a good limiting effect on the expansion of the battery cells can be achieved. Specifically, experiments show that the middle area of the battery cell along the first direction is easy to expand, so that the first convex part and the substrate are arranged to extend along the first direction, and the expansion of the battery cell can be better limited.

In some embodiments, one of the first end plate and the second end plate is provided with a limit protrusion, and the other one is provided with a limit hole, and the limit protrusion and the limit hole are in plug-in fit.

In the technical scheme, the limiting convex parts and the limiting holes are arranged, so that the limiting effect can be achieved in the assembly process of the first end plate and the second end plate and the subsequent use process, and the relative displacement of the first end plate and the second end plate is reduced.

In some embodiments, the second plate body is an insulator.

In the technical scheme, the second plate body is arranged as the insulating piece, so that the insulating performance of the end plate assembly and the battery cells can be improved, and the reliability of the battery module is improved.

In a second aspect, an embodiment of the present application further provides a battery module, including the above end plate assembly and a module body, where the module body includes a plurality of battery cells, and the plurality of battery cells are sequentially disposed along a second direction, and the end plate assembly is disposed at least one end of the module body in the second direction, and the second direction is parallel to an arrangement direction of the first end plate and the second end plate.

In some embodiments, the battery module further comprises a spacing strap that sleeves the module body and the end plate assembly together.

In the technical scheme, the module body and the end plate assembly are sleeved together by the limiting belt, the module body and the end plate assembly have strong tensile capacity, the expansion of the battery cells can be effectively limited, and the manufacturing cost is low. Besides, the limiting belt is connected with the end plate assembly and the module body in a sleeved mode, the installation steps are simple, and the production efficiency is high.

In a third aspect, an embodiment of the present application further provides a battery, including the above battery module.

In a fourth aspect, an embodiment of the present application further provides an electrical device, including the above battery, where the battery is used to provide electrical energy.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for a person skilled in the art.

FIG. 1 is a schematic illustration of a vehicle according to some embodiments of the present application;

Fig. 2 is a schematic structural diagram of a battery according to some embodiments of the present application;

Fig. 3 is a schematic structural view of a battery module according to some embodiments of the present application;

FIG. 4 is a schematic illustration of one of the end cap assemblies provided in accordance with some embodiments of the present application;

FIG. 5 is an exploded view of the end cap assembly of FIG. 4;

FIG. 6 is a schematic view of the first end plate of the end cap assembly shown in FIG. 5;

FIG. 7 is a schematic view of the second end plate of the end cap assembly shown in FIG. 5;

FIG. 8 is a cross-sectional view of the end cap assembly shown in FIG. 4;

FIG. 9 is a schematic structural view of a support member of the end cap assembly shown in FIG. 5;

FIG. 10 is a schematic illustration of another configuration of an end cap assembly provided in accordance with some embodiments of the present application;

Fig. 11 is an exploded view of the endplate assembly of fig. 10.

Reference numerals of the specific embodiments are as follows:

1.2, a battery, 3, a controller, 4, a motor, 5, a battery module, 21 and a box body;

6. a module body 61, a battery cell;

7. An end plate assembly;

71. The first end plate 711, the first plate body, 7111, a base plate, 7112, a first convex part, 7113, a concave space, 712, a hemming structure, 7121, a first wall, 7122, a second wall, 7123, a third wall, 7124, a containing cavity, 7125, a fourth wall, 7126, a first through hole, 7127, a second through hole, 7128, a lifting hole, 7129, and a positioning hole;

72. A second end plate 721, a second plate body 722, a filling structure 7221, reinforcing ribs 7222, grooves 7223, first reinforcing ribs 7224, second reinforcing ribs 7225, third reinforcing ribs 7226, fourth reinforcing ribs 723, and positioning grooves;

73. support piece 731, support body 732, protrusion 7321, first protrusion;

74. a limit protrusion;

75. A limiting hole;

76. a first adhesive layer;

77. a second adhesive layer;

78. A mounting cavity;

8. a limit belt;

9. An output electrode base;

x, a first direction, Y, a second direction, Z and a third direction.

Detailed Description

For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.

Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs, the terms used in the description of this application in this application are for the purpose of describing particular embodiments only and are not intended to be limiting of the application, and the terms "comprising" and "having" and any variations thereof in the description of this application and the claims and the above description of the drawings are intended to cover non-exclusive inclusions. The terms first, second and the like in the description and in the claims or in the above-described figures, are used for distinguishing between different objects and not necessarily for describing a particular sequential or chronological order.

Reference in the specification to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearances of such phrases in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.

In the description of the present application, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "attached" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected, directly connected, indirectly connected through an intermediary, or may be in communication with the interior of two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art according to the specific circumstances.

The term "and/or" in the present application is merely an association relation describing the association object, and indicates that three kinds of relations may exist, for example, a and/or B may indicate that a exists alone, while a and B exist together, and B exists alone. In the present application, the character "/" generally indicates that the front and rear related objects are an or relationship.

In the embodiments of the present application, the same reference numerals denote the same components, and detailed descriptions of the same components are omitted in different embodiments for the sake of brevity. It should be understood that the thickness, length, width, etc. dimensions of the various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length, width, etc. dimensions of the integrated device, are merely illustrative and should not be construed as limiting the application in any way.

The term "plurality" as used herein refers to two or more (including two).

In the present application, the battery cells may include a lithium ion secondary battery cell, a lithium ion primary battery cell, a lithium sulfur battery cell, a sodium lithium ion battery cell, a sodium ion battery cell, or a magnesium ion battery cell, which is not limited in the embodiment of the present application. The battery cell may be in a cylindrical shape, a flat shape, a rectangular parallelepiped shape, or other shapes, which is not limited in this embodiment of the application.

Reference to a battery in accordance with an embodiment of the present application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in the present application may include a battery module or a battery pack, or the like. The battery generally includes a case for enclosing one or more battery cells. The case body can prevent liquid or other foreign matters from affecting the charge or discharge of the battery cells.

The battery cell comprises an electrode assembly and electrolyte, wherein the electrode assembly comprises a positive electrode plate, a negative electrode plate and a separator. The battery cell mainly relies on metal ions to move between the positive pole piece and the negative pole piece to work. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, wherein the positive electrode active material layer is coated on the surface of the positive electrode current collector, the positive electrode current collector comprises a positive electrode coating area and a positive electrode lug connected to the positive electrode coating area, the positive electrode coating area is coated with the positive electrode active material layer, and the positive electrode lug is not coated with the positive electrode active material layer. Taking a lithium ion battery monomer as an example, the material of the positive electrode current collector can be aluminum, the positive electrode active material layer comprises a positive electrode active material, and the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium or lithium manganate and the like. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is coated on the surface of the negative electrode current collector, the negative electrode current collector comprises a negative electrode coating area and a negative electrode tab connected with the negative electrode coating area, the negative electrode coating area is coated with the negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The material of the separator may be PP (polypropylene) or PE (polyethylene), etc.

The battery cell further includes a case inside which a receiving chamber for receiving the electrode assembly is formed. The case may protect the electrode assembly from the outside to prevent foreign substances from affecting the charge or discharge of the electrode assembly.

When a plurality of battery monomers are sequentially arranged and combined to form a battery module, an end plate is usually required to be arranged at least one end of the battery module in the length direction, and the end plate is attached to the battery monomers so as to form limiting and protecting effects on the battery monomers.

When the battery monomer expands in the process of charge-discharge circulation, the length of the battery module is prolonged, the structure limiting expansion with the end plate is subjected to tensile force, the tensile force acts on the two ends of the end plate in the width direction of the battery module, the end plate is easy to deform, so that the supporting effect in the width direction is weakened, the structure limiting expansion is deformed in the length direction of the battery module, the limiting effect of the end plate on the expansion of the battery monomer is reduced, the battery monomer is deformed, and the service life is shortened.

In view of this, the application provides an end plate assembly, it is through setting up first end plate and the second end plate of laminating, and set up two turn-up structures at the both ends of first board body along the first direction, two turn-up structures enclose with first board body and establish and form accommodation space, at least part of second end plate is located accommodation space and offsets or the clearance setting with at least one turn-up structure in the first direction, in this way, the second end plate can play the supporting role to first end plate in the first direction, reduce the deformation of first end plate in the first direction, thereby improve the support ability of first end plate in the first direction, then reduce the deformation of structure in battery module length direction that restricts the inflation, thereby improve the restriction effect of end plate assembly to the inflation of battery cell, reduce the deformation of battery cell, improve battery cell's life.

The end plate assembly described in the embodiments of the present application is applicable to a battery and an electric device using the battery.

The electric device may be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, an electric tool, or the like. The vehicle may be a fuel oil vehicle, a gas vehicle or a new energy vehicle, the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc., the spacecraft includes an airplane, a rocket, a space plane, a spacecraft, etc., the electric toy includes a fixed or movable electric toy such as a game machine, an electric vehicle toy, an electric ship toy, an electric plane toy, etc., and the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool such as an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator, an electric planer, etc. The embodiment of the application does not limit the electric device in particular.

For convenience of explanation, the following examples will be described taking an electric device as an example of a vehicle.

Fig. 1 is a schematic structural diagram of a vehicle according to some embodiments of the present application.

As shown in fig. 1, the interior of the vehicle 1 is provided with a battery 2, and the battery 2 may be provided at the bottom or at the head or at the tail of the vehicle 1. The battery 2 may be used for power supply of the vehicle 1, for example, the battery 2 may serve as an operating power source of the vehicle 1.

The vehicle 1 may further comprise a controller 3 and a motor 4, the controller 3 being arranged to control the battery 2 to power the motor 4, for example for operating power requirements during start-up, navigation and driving of the vehicle 1.

In some embodiments of the application, the battery 2 may not only serve as an operating power source for the vehicle 1, but also as a driving power source for the vehicle 1, instead of or in part instead of fuel oil or natural gas, to provide driving power for the vehicle 1.

As shown in fig. 2, the battery 2 includes a case 21 and a battery module 5, the case 21 having an accommodation space, and the battery module 5 being disposed in the accommodation space.

In the battery 2, the number of battery modules 5 may be one or a plurality. If there are a plurality of battery modules 5, the plurality of battery modules 5 may be connected in series or parallel or series-parallel to form a whole and fixed to the case 21. Series-parallel connection means that a plurality of battery modules 5 are connected in series or in parallel.

Fig. 3 is a schematic structural diagram of a battery module according to some embodiments of the present application.

As shown in fig. 3, the present application further provides a battery module 5, which includes a module body 6 and an end plate assembly 7, wherein the module body 6 includes a plurality of battery cells 61, the plurality of battery cells 61 are sequentially arranged along the second direction Y, and the end plate assembly 7 is disposed at least one end of the module body 6 in the second direction Y.

In the module body 6, the plurality of battery cells 61 may be connected in series or parallel or a series-parallel connection, wherein a series-parallel connection refers to that the plurality of battery cells 61 are connected in series or parallel.

The endplate assembly 7 and the module body 6 may be bonded or otherwise connected.

The number of the end plate assemblies 7 is two, and two end plate assemblies 7 are disposed at two ends of the module body 6 in the second direction Y.

Fig. 4 is a schematic structural view of one of the end cap assemblies according to some embodiments of the present application, fig. 5 is an exploded structural view of the end cap assembly shown in fig. 4, and fig. 6 is a structural view of a first end plate of the end cap assembly shown in fig. 5.

As shown in fig. 4-6, the present application further provides an end plate assembly 7, which includes a first end plate 71 and a second end plate 72, wherein the first end plate 71 includes a first plate body 711 and two hemming structures 712, and the two hemming structures 712 are located at opposite ends of the first plate body 711 along the first direction X. The second end plate 72 is attached to the first plate body 711, and a side of the second end plate 72 facing away from the first end plate 71 is used for connection with the battery cell 61. The hemming structure 712 extends along the direction from the first end plate 71 to the second end plate 72, and encloses an accommodating space with the first plate body 711, at least a portion of the second end plate 72 is located in the accommodating space and is attached to the first plate body 711, the second end plate 72 is disposed against or in a gap with the at least one hemming structure 712 in a first direction X, and the first direction X intersects an arrangement direction of the first end plate 71 and the second end plate 72.

The end plate assembly 7 of the present embodiment may be connected to a side plate or the like, or may be fitted with a stopper band 8 such as an annular steel band or the like to restrict expansion of the battery cell 61. When the end plate assembly 7 is matched with the limit belt 8, the limit belt is sleeved on the outer peripheral sides of the module body 6 and the end plate assembly 7, and the end plate assembly 7 is pressed on at least one end of the module body 6 in the second direction Y. Wherein the second direction Y intersects the first direction X. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72. Further, the second direction Y is perpendicular to the first direction X.

The first end plate 71 of the embodiment of the present application is located at the side of the second end plate 72 facing away from the battery cell 61, i.e., the first end plate 71 is located at the outer side of the second end plate 72.

The second end plate 72 of the embodiment of the present application may be connected to the battery cell 61 by means of adhesion, clamping, or the like. The side of the second end plate 72 facing away from the first end plate 71 in the embodiment of the present application may be a plane, a curved surface, or an irregularly shaped surface combining a plane and a curved surface.

In the embodiment of the present application, the second end plate 72 is attached to the first end plate 71, and the two may be in direct contact, or may be attached after sandwiching other interlayer.

The first plate body 711 of the embodiment of the present application may have a flat plate structure, a wave plate structure, or other shapes.

The hemming structure 712 of the embodiment of the present application is curved, and may extend to a side facing the second end plate 72 or to a side facing away from the second end plate 72.

The hemming structure 712 of the embodiment of the present application may be formed by bending and connecting multiple sections of straight walls, or may be a curved wall structure, or may be a structure in which a straight wall and a curved wall are combined.

Optionally, the first plate body 711 and the hemming structure 712 are integrally formed.

The hemming structure 712 extends in a direction from the first end plate 71 to the second end plate 72, that is, the hemming structure 712 protrudes from the first plate body 711 so as to enclose an accommodating space with the first plate body 711.

In the embodiment of the present application, the second end plate 72 is disposed against or spaced from the at least one hemming structure 712 in the first direction X, that is, a portion of the hemming structure 712 protruding from the first plate body 711 and a portion of the second end plate located in the accommodating space are aligned along the first direction X, and are disposed against or spaced from each other.

Alternatively, the first direction X is perpendicular to the arrangement direction of the first end plate 71 and the second end plate 72.

According to the end plate assembly 7 of the embodiment of the application, the first end plate 71 and the second end plate 72 are bonded, the two curled edges 712 are respectively arranged at two ends of the first plate body 711 along the first direction X, the two curled edges 712 and the first plate body 711 are enclosed to form an accommodating space, at least part of the second end plate 72 is positioned in the accommodating space and is propped against or arranged in a gap with at least one curled edge 712 along the first direction X, so that the second end plate can support at least one curled edge 712 along the first direction X, the deformation of the curled edge 712 along the first direction X is reduced, the supporting capacity of the first end plate 71 along the first direction X is improved, the deformation of a structure for limiting expansion, such as a limit belt 8, along the second direction Y of the battery module 5 is reduced, the limiting effect of the end plate assembly 7 on the expansion of the battery cell 61 is improved, the deformation of the battery cell 61 is reduced, and the service life of the battery cell 61 is prolonged.

Fig. 7 is a schematic view of the second end plate of the end cap assembly of fig. 5.

Referring to fig. 7, in some embodiments, the second end plate 72 includes a second plate body 721 and a filling structure 722, the second plate body 721 is used for being attached to the battery cell 61, the filling structure 722 is disposed on a side of the second plate body 721 facing the first end plate 71, at least a portion of the filling structure 722 is located in the accommodating space and attached to the first plate body 711, two curled structures 712 are located on two sides of the filling structure 722 in the first direction X, and at least one curled structure 712 is disposed against or in a gap with the filling structure 722 in the first direction X.

The material of the filling structure 722 in the embodiment of the application can be metal, foaming material, plastic and the like.

The side of the second plate body 721 facing away from the filling structure 722 may be a plane, a curved surface, or a plane or a combination of curved surfaces.

The filling structure 722 in the embodiment of the application can be a solid block structure or a hollow structure.

The second plate body 721 and the filling structure 722 may be integrally formed, welded, bonded, or the like.

The filling structure 722 in the embodiment of the application is attached to the first board body 711, and the filling structure 722 and the first board body can be in direct contact or can be attached after other interlayers are arranged.

The hemming structure 712 is disposed against or in a gap with the filling structure 722 in the first direction X, that is, a portion of the hemming structure 712 protruding from the first plate body 711 is aligned with the filling structure 722 in the first direction X, and the two are disposed against or in a gap.

The second plate body 721 for connecting the battery cells 61 is provided, and thus the filling structure 722 may be provided more flexibly, i.e., may have a hollow structure, or may have a solid structure or other structures.

Optionally, the projection of the second plate body 721 onto the filling structure 722 along the second direction Y covers the filling structure 722. In this way, the area of the second plate body 721 is large, and the connection area with the battery cell 61 can be increased, thereby improving the fastening property with the battery cell 61. The second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

Optionally, all of the filling structures 722 are located in the receiving space.

In some embodiments, two bead structures 712 are disposed against or in gaps with the filler structure 722 in the first direction X, respectively.

The two hemming structures 712 of the embodiment of the present application may be disposed in a gap with the filling structure 722, and the other may be abutted against the filling structure 722, or both the two hemming structures 712 may have a gap with the filling structure 722.

So set up, then filling structure 722 can play the supporting role to two turn-up structures 712 in first direction X, further reduce the deformation of turn-up structure 712 in first direction X, further improve first terminal plate 71's support ability in first direction X, then reduce the deformation of structure that restricts the inflation such as spacing area 8 in battery module 5 second direction Y, thereby improve the restriction effect of end plate assembly 7 to the inflation of battery cell 61, reduce the deformation of battery cell 61, improve battery cell 61's life.

In some embodiments, the second plate body 721 protrudes from opposite ends of the filling structure 722 along the first direction X, and the two hemming structures 712 are attached and connected to opposite ends of the second plate body 721 along the first direction.

The hemming structure 712 of the embodiment of the present application is attached to the second board body 721, and the two may be directly contacted, or may be attached after sandwiching other sandwich structures. Illustratively, the hemming structure 712 and the second plate body 721 are bonded by a second glue layer 77. The two can also be connected by adopting a welding mode and the like.

By doing so, the fastening of the first end plate 71 and the second end plate 72 can be improved.

FIG. 8 is a cross-sectional view of the end cap assembly shown in FIG. 4.

Referring to fig. 8, in some embodiments, the hemming structure 712 includes a first wall 7121, a second wall 7122 and a third wall 7123 that are sequentially connected at an angle along a bending direction thereof, the first wall 7121, the second wall 7122 and the third wall 7123 enclose a receiving cavity 7124, the first wall 7121 and the third wall 7123 are oppositely disposed along a second direction Y, the first wall 7121 is connected to the first plate body 711, an end of the third wall 7123 facing away from the second wall 7122 abuts against the filling structure 722 or has a gap, and the second direction Y is parallel to an arrangement direction of the first end plate 71 and the second end plate 72.

The first wall 7121, the second wall 7122 and the third wall 7123 in the embodiment of the present application are enclosed to form a semi-annular structure. The shape of the first wall 7121, the second wall 7122 or the third wall 7123 is not limited in the embodiment of the present application, and may be a straight wall, a curved wall or an irregularly shaped wall formed by combining a straight wall and a curved wall.

The first wall 7121 and the second wall 7122 and the third wall 7123 of the embodiment of the present application may be connected at an acute angle, an obtuse angle, or a right angle.

The first wall 7121 and the third wall 7123 according to the embodiment of the present application are disposed opposite to each other along the second direction Y, which does not necessarily mean that they are parallel to each other, and one may be inclined relative to the other.

The first wall 7121 and the first plate body 711 according to the embodiment of the present application may be connected by welding or integrally molding. Illustratively, the first wall 7121, the second wall 7122, the third wall 7123, and the first plate body 711 are integrally formed.

The second direction Y of the embodiment of the present application intersects the first direction X. Further, the second direction Y is perpendicular to the first direction X.

The accommodating cavity 7124 can enable the hemming structure 712 to have better supporting force in the second direction Y, reduce deformation of the hemming structure 712 in the second direction Y after being stressed, and have good protection effect on the battery cell. And, when using the spacing area 8 to restrict the inflation of battery cell 61, the turn-up structure 712 can play support and tensioning effect to the spacing area 8 in second direction Y, improves the restriction effect of spacing area 8 to the inflation of battery cell 61, reduces the deformation of battery cell 61.

In some embodiments, the second plate body 721 protrudes from opposite ends of the filling structure 722 along the first direction, and the third wall 7123 is adhered to and connected to the second plate body 721.

The third wall 7123 in the embodiment of the present application is attached to the second plate body 721, and may be directly contacted with the second plate body or attached to the second plate body after sandwiching other sandwich structures. Illustratively, the third wall 7123 and the second plate body 721 are bonded by a second adhesive layer 77. The two can also be connected by adopting a welding mode and the like.

In some embodiments, at least a portion of the first wall 7121 protrudes from the first plate body 711 in a direction in which the second end plate 72 points toward the first end plate 71.

Specifically, at least part of the first wall 7121 protrudes from the first plate body 711, which may be a curved wall or a bent wall of the first wall 7121, and the first wall 7121 may be partially protruded from the first plate body 711 by bending or bending, or the whole first wall 7121 may be located on a side of the first plate body 711 away from the second end plate 72, or other cases.

When using spacing area 8 cooperation end plate assembly 7, so set up, when battery cell 61 takes place to expand, reducible first board body 711 bears the local pressure that spacing area 8 brought in second direction Y, evenly transmits the pressure for first board body 711 through turn-up structure 712 to further improve the homogeneity of first board body 711 atress, reduce the deformation of first board body 711, then improve the restriction effect of first end plate 71 to battery cell 61's inflation, reduce battery cell 61's deformation.

In some embodiments, at least a portion of the second wall 7122 protrudes from the second end plate 72 in the first direction X.

In the embodiment of the present application, the second wall 7122 protrudes from the second end plate 72 in a direction away from the first plate body 711. Specifically, at least a part of the second wall 7122 protrudes from the second end plate 72, which may be that the second wall 7122 itself is a curved wall or a bent wall, and the second wall 7122 is bent or bent to protrude from the second end plate 72, or the whole second wall 7122 may protrude from the second end plate 72 along the second direction Y, or other cases.

When the spacing belt 8 is used in cooperation with the end plate assembly 7, since at least part of the second wall 7122 protrudes from the second end plate 72 along the first direction X, the supporting effect of the second wall 7122 in the second direction Y is further improved, the pressure applied by the spacing belt 8 to the side surface area of the module body 6 is reduced, thereby protecting the battery cell 61, and the spacing belt 8 is further tensioned, thereby improving the limiting effect of the end plate assembly 7 on the expansion of the battery cell 61.

In some embodiments, the first wall 7121 and the second wall 7122 transition smoothly.

When the first wall 7121 and the second wall 7122 are set to be in smooth transition, the limit belt 8 is in contact with a smooth curved surface, so that damage to the limit belt 8 can be reduced.

In some embodiments, the hemming structure 712 further includes at least one fourth wall 7125, the fourth wall 7125 is connected to at least one end of the third wall 7123 in the third direction Z at an angle, the fourth wall covers at least part of the accommodating cavity 7124 and is provided with a first through hole 7126 through which the target connector passes, and the third direction Z, the first direction X, and the second direction Y intersect two by two.

Optionally, the third direction Z, the first direction X and the second direction Y are perpendicular to each other.

Optionally, the first wall 7121, the second wall 7122, the third wall 7123, and the fourth wall 7125 are integrally formed.

The fourth wall 7125 and the third wall 7123 of the embodiments of the present application may be connected at an acute angle, an obtuse angle, or a right angle. Illustratively, the fourth wall 7125 is connected at right angles to the third wall 7123. Further alternatively, the fourth wall 7125 smoothly transitions with the third wall 7123.

Optionally, the fourth wall 7125 is plate-shaped and perpendicular to the third direction Z. Of course, the fourth wall 7125 may be a curved wall.

The target connection member of the embodiment of the present application may be a bolt which is screwed with the case 21 through the first through hole 7126 of the fourth wall 7125. Of course, other target connectors are also possible.

The fourth wall 7125 is provided, and at the end where the fourth wall 7125 is provided, there is no need to provide other transition connecting members on the hemming structure 712, so that the problem of weak middle mechanical properties caused by adding the transition connecting members is solved, and the target connecting member only needs to directly penetrate through the fourth wall 7125, so that the use is convenient.

In some embodiments, the number of the fourth walls 7125 is two, the two fourth walls 7125 are connected to two ends of the third wall 7123 opposite to each other in the third direction Z, and the two first through holes 7126 are aligned along the third direction Z.

Alternatively, the fourth wall 7125 is plate-shaped, and two fourth walls 7125 are disposed in parallel and perpendicular to the third direction Z.

The two fourth walls 7125 are arranged, so that other structures are not required to be placed on the hemming structure 712, the problem of weak middle mechanical property caused by adding a transitional connecting component is further improved, and the target connecting piece directly penetrates through the two fourth walls 7125 to realize locking attachment with the box body 21, so that the use is convenient.

In some embodiments, the projection of the fourth wall 7125 onto the first wall 7121 in the third direction Z covers at least a portion of the first wall 7121 and abuts or has a gap to an end of the first wall 7121.

By the arrangement, when the target connecting piece is locked, the first wall 7121 can provide a supporting function for the fourth wall 7125, so that deformation of the fourth wall 7125 is reduced, and the locking tightness of the end plate assembly 7 and the box body 21 is improved.

Fig. 9 is a schematic structural view of a support member of the end cap assembly shown in fig. 5.

Referring to fig. 8 and 9, in some embodiments, the endplate assembly 7 further includes a support 73, at least a portion of the support 73 being located in the receiving cavity 7124 and being connected to the first wall 7121 and the third wall 7123.

The support 73 of the embodiment of the present application may be a plate, a bar or a block.

The support 73 and the first wall 7121 or the third wall 7123 may be connected by a fastening, bonding, welding, or the like.

When the limit belt 8 is used in combination with the end plate assembly 7, the supporting member 73 is supported between the first wall 7121 and the third wall 7123, so that the supporting capability of the hemming structure 712 in the second direction Y can be improved, the deformation of the hemming structure 712 in the second direction Y after being stressed is reduced, the tensioning capability of the hemming structure 712 on the limit belt 8 is improved, and the limiting effect of the end plate assembly 7 on the expansion of the battery cell 61 is improved.

In some embodiments, the supporting member 73 includes a supporting body 731 and protrusions 732 disposed on two opposite sides of the supporting body 731 along the second direction Y, each of the first wall 7121 and the third wall 7123 is provided with a second through hole 7127, and the protrusions 732 are in plug-fit with the second through holes 7127.

In the embodiment of the present application, the number of the protrusions 732 on one side of the supporting body 731 may be one or more. Alternatively, the projections 732 are in one-to-one plug-fit with the second through holes 7127. Of course, two projections 732 on the same side of the supporting body 731 may be inserted into one second through hole 7127.

The projection 732 and the second through hole 7127 are snap-fit, i.e. are matched in size, such that the second through hole 7127 forms a stop for the projection 732, thereby reducing displacement of the support 73 during use.

The support piece 73 and the hemming structure 712 are in a plug-in fit mode, so that the assembly and the disassembly are convenient.

In some embodiments, when the hemming structure 712 includes the fourth wall 7125, the fourth wall 7125 protrudes from the first wall 7121 along the second end plate 72 to the first end plate 71, the plurality of protrusions 732 disposed on the supporting body 731 includes a first protrusion 7321, the first protrusion 7321 is in plug-fit with the first wall 7121 and protrudes from the first wall 7121, and the first protrusion 7321 and the fourth wall 7125 are disposed at a distance from each other and form a spacing space therebetween for spacing the spacing belt 8.

In the embodiment of the present application, the fourth wall 7125 protrudes from the first wall 7121 along the second end plate 72 to the first end plate 71, which means that a part of the fourth wall 7125 protrudes from the first wall 7121.

The first protrusion 7321 and the fourth wall 7125 of the embodiment of the present application protrude from the first wall 7121, thereby forming a limiting effect on both ends of the limiting band 8.

Optionally, the supporting member 73 has two first protrusions 7321 in plug-in fit with the first wall 7121, the number of the fourth walls 7125 is two, the two fourth walls 7125 are connected to two ends of the third wall 7123 opposite to each other in the third direction Z, and the two fourth walls 7125 are in one-to-one fit with the two first protrusions 7321 to form two limiting spaces for limiting the upper and lower limiting bands 8.

Alternatively, when the support 73 has a plurality of projections 732 that are inserted into the first wall 7121, among the plurality of projections 732, the projections 732 other than the first projection 7321 are located in the second through hole 7127.

By the arrangement, the first protrusion 7321 and the fourth wall 7125 can form a limiting function on the limiting belt 8, so that the possibility of falling off the limiting belt 8 is reduced.

In some embodiments, the side of the second plate body 721 facing away from the filling structure 722 is planar.

Optionally, the second plate body 721 is adhered to the battery cell 61 using the first adhesive layer 76.

Optionally, the second plate body 721 is a plate-like structure.

The side of the second plate body 721 facing away from the filling structure 722 is set to be a plane, and the plane is more adhered to the surface of the battery cell 61 and is more fastened.

In some embodiments, the filling structure 722 includes a plurality of reinforcing ribs 7221 disposed in a staggered manner, the plurality of reinforcing ribs 7221 are in concave-convex fit with the first end plate 71, and the plurality of reinforcing ribs 7221 and the second plate body 721 enclose a plurality of grooves 7222 forming openings toward the first end plate 71.

The included angle formed by the intersecting and matching of the reinforcing ribs 7221 in the embodiment of the application can be an acute angle, an obtuse angle or a right angle. Optionally, the plurality of reinforcing ribs 7221 form a right angle after intersecting.

Optionally, the surface of the plurality of reinforcing ribs 7221 matching the second end plate 72 is a wavy curved surface.

Alternatively, the plurality of reinforcing ribs 7221 includes a plurality of first reinforcing ribs 7223 and a plurality of second reinforcing ribs 7224, the plurality of first reinforcing ribs 7223 are arranged along the third direction Z and extend along the first direction X, the plurality of second reinforcing ribs 7224 are arranged along the first direction X and extend along the third direction Z, and the plurality of first reinforcing ribs 7223 and the plurality of second reinforcing ribs 7224 are staggered.

The filling structure 722 is in a structure form that a plurality of reinforcing ribs 7221 are staggered with each other, and a plurality of grooves 7222 are formed by surrounding the second plate body 721, so that the weight of the second end plate 72 can be reduced, and the light-weight design can be realized.

In some embodiments, the stiffener 7221, the second plate body 721, and the first end plate 71 enclose a mounting cavity 78 for mounting the output pole mount 9. Further alternatively, the plurality of reinforcing ribs 7221 includes third reinforcing ribs 7225 and fourth reinforcing ribs 7226 disposed opposite to each other in the first direction X, the second plate body 721 and the first end plate 71 are disposed opposite to each other in the second direction Y, and the third reinforcing ribs 7225, the fourth reinforcing ribs 7226, the second plate body 721 and the first end plate 71 enclose a mounting cavity 78 having a quadrangular opening.

The enclosing arrangement forms the installation cavity 78, can make things convenient for the installation of output pole base 9, plays spacing effect to it.

Further alternatively, the third bead 7225, the fourth bead 7226 and the end face of the first end plate 71 at the opening of the mounting chamber 78 are on the same plane. So set up, can with output polar base 9 looks adaptation, make its installation more firm.

Fig. 10 is a schematic view of another construction of an end cap assembly according to some embodiments of the present application, and fig. 11 is an exploded construction of the end cap assembly of fig. 10.

Referring to fig. 10 and 11, in some embodiments, the fill structure 722 is a solid structure.

The filling structure 722 of the present embodiment is a solid structure, but may have a groove or hole structure disposed thereon, i.e., a substantially solid structure. Alternatively, the filling structure 722 is made of a polymer material.

By arranging the filling structure 722 to be a solid structure, the end plate assembly 7 can more uniformly transmit expansion-inhibiting pressure to the battery cells 61, reduce local stress of the battery cells 61, and improve uniformity of stress of the battery cells 61.

In some embodiments, the first plate body 711 has opposite ends in the third direction Z, and the hemming structure 712 extends from one end of the first plate body 711 to the other end, the first direction X and the third direction Z intersecting.

Alternatively, the third direction Z is parallel to the arrangement direction of the top and bottom ends of the battery cells 61, wherein the top ends of the battery cells 61 are provided with poles. Further alternatively, the first direction X, the second direction Y, and the third direction Z are perpendicular to each other.

Extending the hemming structure 712 from one end of the first plate body 711 to the other end thereof can not only improve the flexibility of the position setting of the limit belt 8, but also directly transfer the pressure applied to the hemming structure 712 to more areas of the first plate body 711, thereby improving the restriction of the expansion of the first plate body 711 to the battery cell 61.

In some embodiments, the first plate body 711 includes a base plate 7111 and a first protrusion 7112, the first protrusion 7112 protrudes from the base plate 7111 in a direction from the second end plate 72 to the first end plate 71, a concave space 7113 is formed on a side of the first protrusion 7112 facing the second end plate 72, and the second end plate 72 is attached to the base plate 7111 and the first protrusion 7112.

When the number of the first protruding portions 7112 is plural, the shapes of the plural first protruding portions 7112 may be the same or different. The plurality of first protruding portions 7112 may be arranged in an array or may be arranged in a disordered manner.

Alternatively, the first end plate 71 is made of a metal material and is integrally formed by stamping. The manufacturing efficiency can be improved.

The second end plate 72 in the embodiment of the application transfers the expansion force to the first end plate 71 after receiving the expansion force of the battery cell 61, and the first end plate 71 combines with other structures for limiting deformation, such as the limiting belt 8, to limit the expansion of the battery cell 61 through the second end plate 72, and since the first end plate 71 has the first convex portion 7112, the first end plate 71 has good bending resistance and is not easy to bend, and is not easy to deform compared with a flat plate structure, the deformation of the battery cell 61 can be effectively limited when the battery cell 61 expands, thereby reducing the deformation degree of the battery cell 61 after expansion and prolonging the service life of the battery cell 61.

In some embodiments, the number of the first protruding portions 7112 is plural, and the plurality of first protruding portions 7112 are disposed at intervals along the third direction Z and extend along the first direction X, and the third direction Z and the second direction Y intersect the first direction X in pairs, and the second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

The first protruding portion 7112 of the embodiment of the present application may extend along the first direction X to the entire substrate 7111, or may extend along the first direction X to a portion of the substrate 7111.

Optionally, the first direction X and the second direction Y are perpendicular to the third direction Z.

The plurality of first protruding portions 7112 are disposed at intervals along the third direction Z and extend along the first direction X, and the substrate 7111 is also in an extended state along the first direction X, so that the expansion of the battery cells 61 can be well restricted for the battery cells 61 whose top and bottom ends are arranged along the third direction Z. Specifically, it has been found through experiments that the battery cell 61 is easily expanded in the middle region of the first direction X, and thus the first protrusion 7112 and the substrate 7111 are disposed to extend in the first direction X, which can better limit the expansion of the battery cell 61.

In some embodiments, one of the first end plate 71 and the second end plate 72 is provided with a limit protrusion 74, and the other is provided with a limit hole 75, and the limit protrusion 74 and the limit hole 75 are in plug-fit.

Optionally, the first end plate 71 is provided with a limiting aperture 75 and the second end plate 72 is provided with a limiting protrusion 74.

The limit projection 74 of the embodiment of the present application may be a square bar, a pin bar, or the like.

The dimensions of the limit projection 74 and the limit hole 75 of the embodiment of the present application are matched.

The limiting protrusion 74 and the limiting hole 75 can play a limiting role in the assembly process of the first end plate 71 and the second end plate 72 and the subsequent use process, and the relative displacement of the first end plate 71 and the second end plate 72 is reduced.

In some embodiments, the second plate body 721 is an insulator.

The second plate body 721 may be made of plastic or an insulating composite material, for example.

Further alternatively, fill structure 722 is an insulator.

The second plate body 721 is provided as an insulating member, which increases the insulating performance of the end plate assembly 7 and the battery cells 61, and improves the reliability of the battery module 5.

In some embodiments, the first end plate 71 is provided with a positioning hole 7129 penetrating itself in the second direction Y, and the second end plate 72 is provided with a positioning groove 723 opening toward the first end plate 71, the positioning groove 723 being disposed opposite to and communicating with the positioning hole 7129.

Illustratively, the locating aperture 7129 is a circular aperture and the opening of the locating slot 723 is circular. Alternatively, the diameter of the positioning hole 7129 is smaller than the diameter of the opening of the positioning groove 723. Of course, the openings of the positioning holes 7129 and the positioning grooves 723 may be other shapes, such as rectangular.

Positioning holes 7129 and positioning grooves 723 are provided for use in positioning the first end plate 71 and the second end plate 72 when the battery modules 5 are grouped, improving the positional accuracy of the first end plate 71 and the second end plate 72.

In some embodiments, the first wall 7121 is provided with a lifting hole 7128, and the lifting hole 7128 is used when lifting the battery module 5.

The embodiment of the application also provides a battery module 5, which comprises the end plate assembly 7 and the module body 6. The module body 6 includes a plurality of battery cells 61, the plurality of battery cells 61 are sequentially arranged along a second direction Y, and the end plate assembly 7 is disposed at least one end of the module body 6 along the second direction Y, and the second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72.

In some embodiments, the battery module 5 further includes a spacing strap 8, the spacing strap 8 nesting the module body 6 and the end plate assembly 7 together.

The limit band 8 can be made of steel or other materials.

The module body 6 and the end plate assembly 7 are sleeved together by the limiting belt 8, so that the module has strong tensile capacity, can effectively limit the expansion of the battery cell 61, and is low in manufacturing cost. Besides, the limiting belt 8 is connected with the end plate assembly 7 and the module body 6 in a sleeved mode, the installation steps are simple, and the production efficiency is high.

The embodiment of the application also provides a battery 2, which comprises the battery module 5.

The embodiment of the application also provides an electric device, which comprises the battery 2, wherein the battery 2 is used for providing electric energy.

Referring to fig. 4-11, an embodiment of the present application provides an end plate assembly 7, wherein the end plate assembly 7 includes a first end plate 71 and a second end plate 72, the first end plate 71 includes a first plate body 711 and two hemming structures 712, and the two hemming structures 712 are located at opposite ends of the first plate body 711 along a first direction X. The second end plate 72 is attached to the first plate body 711, and a side of the second end plate 72 facing away from the first end plate 71 is used for connection with the battery cell 61. The hemming structure 712 extends along the direction from the first end plate 71 to the second end plate 72, and encloses an accommodating space with the first plate body 711, at least a portion of the second end plate 72 is located in the accommodating space and is attached to the first plate body 711, the second end plate 72 is disposed against or in a gap with the at least one hemming structure 712 in a first direction X, and the first direction X intersects an arrangement direction of the first end plate 71 and the second end plate 72. The second end plate 72 includes a second plate body 721 and a filling structure 722, the second plate body 721 is used for being attached to the battery cell 61, the filling structure 722 is disposed on one side of the second plate body 721 facing the first end plate 71, at least part of the filling structure 722 is located in the accommodating space and attached to the first plate body 711, two curled structures 712 are located on two sides of the filling structure 722 in the first direction X, and the two curled structures 712 are respectively disposed against or in a gap with the filling structure 722 in the first direction X. The second plate body 721 protrudes from opposite ends of the filling structure 722 along the first direction X, and the two hemming structures 712 are attached to and connected to opposite ends of the second plate body 721 along the first direction. The hemming structure 712 includes a first wall 7121, a second wall 7122 and a third wall 7123 which are sequentially connected at an angle along the bending direction of the first wall 7121, the second wall 7122 and the third wall 7123 enclose to form a containing cavity 7124, the first wall 7121 and the third wall 7123 are oppositely arranged along a second direction Y, the first wall 7121 is connected to the first plate body 711, one end of the third wall 7123 facing away from the second wall 7122 abuts against the filling structure 722 or has a gap, and the second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72. The third wall 7123 is adhered to and connected to the second plate body 721. At least part of the first wall 7121 protrudes from the first plate body 711 in a direction in which the second end plate 72 is directed toward the first end plate 71. At least a portion of the second wall 7122 protrudes from the second end plate 72 in the first direction X. The first wall 7121 and the second wall 7122 smoothly transition. The hemming structure 712 further includes two fourth walls 7125, where the two fourth walls 7125 are connected to opposite ends of the third wall 7123 in the third direction Z at an included angle, the fourth walls cover at least part of the accommodating cavity 7124 and are provided with a first through hole 7126 through which the target connection member passes, and the third direction Z, the first direction X, and the second direction Y intersect two by two. The projection of the fourth wall 7125 onto the first wall 7121 in the third direction Z covers at least part of the first wall 7121 and abuts against an end of the first wall 7121 or has a gap. The end plate assembly 7 further comprises a support 73, at least part of the support 73 being located in the receiving cavity 7124 and being connected to the first wall 7121 and the third wall 7123. The supporting member 73 includes a supporting body 731 and protrusions 732 disposed on two opposite sides of the supporting body 731 along the second direction Y, and the first wall 7121 and the third wall 7123 are respectively provided with a second through hole 7127, and the protrusions 732 are in plug-in fit with the second through holes 7127. The fourth wall 7125 protrudes from the first wall 7121 along the second end plate 72 to the first end plate 71, the plurality of protrusions 732 disposed on the supporting body 731 includes a first protrusion 7321, the first protrusion 7321 is in plug-in fit with the first wall 7121 and protrudes from the first wall 7121, and the first protrusion 7321 and the fourth wall 7125 are disposed at intervals to form a spacing space therebetween for spacing the spacing band 8. The side of the second plate body 721 facing away from the filling structure 722 is planar. The first plate body 711 has opposite ends in the third direction Z, and the hemming structure 712 extends from one end to the other end of the first plate body 711, and the first direction X and the third direction Z intersect. The first plate body 711 includes a base plate 7111 and a first protrusion 7112, the first protrusion 7112 protrudes from the base plate 7111 in a direction from the second end plate 72 to the first end plate 71, a concave space 7113 is formed on a side of the first protrusion 7112 facing the second end plate 72, and the second end plate 72 is bonded to the base plate 7111 and the first protrusion 7112. The number of the first protruding portions 7112 is plural, and the plurality of first protruding portions 7112 are disposed at intervals along the third direction Z and extend along the first direction X, and the third direction Z and the second direction Y intersect with the first direction X two by two, and the second direction Y is parallel to the arrangement direction of the first end plate 71 and the second end plate 72. The second plate body 721 is an insulating member. Fill structure 722 is an insulator.

It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other.

It should be noted that the above-mentioned embodiments are merely for illustrating the technical solution of the present application, and not for limiting the same, and although the present application has been described in detail with reference to the above-mentioned embodiments, it should be understood by those skilled in the art that the technical solution described in the above-mentioned embodiments may be modified or some technical features may be equivalently replaced, and these modifications or substitutions do not make the essence of the corresponding technical solution deviate from the spirit and scope of the technical solution of the embodiments of the present application.

Claims

1. An end plate assembly, comprising:

A first end plate, comprising a first plate body and two curling structures, wherein the two curling structures are located at opposite ends of the first plate body along a first direction;

A second end plate, attached to the first plate body, wherein a side of the second end plate facing away from the first end plate is used for connecting with a battery cell;

The curling structure extends from the first end plate to the second end plate, and is surrounded by the first plate body to form a receiving space. At least part of the second end plate is located in the receiving space and is attached to the first plate body. The second end plate and at least one of the curling structures are abutted against or gapped in the first direction, and the first direction intersects with the arrangement direction of the first end plate and the second end plate.

2. The end plate assembly according to claim 1, characterized in that the second end plate comprises a second plate body and a filling structure connected to each other, the second plate body is used to fit the battery cell, the filling structure is arranged on a side of the second plate body facing the first end plate, at least part of the filling structure is located in the accommodating space and fits the first plate body,

The two curling structures are located on both sides of the filling structure in the first direction, and at least one of the curling structures is disposed against or with a gap between the filling structure and the filling structure in the first direction.

3 . The end plate assembly according to claim 2 , wherein the two curling structures are respectively arranged to abut against or have a gap with the filling structure in the first direction.

4. The end plate assembly according to claim 2 is characterized in that the second plate body protrudes from the opposite ends of the filling structure along the first direction, and the two curling structures are attached to and connected to the opposite ends of the second plate body along the first direction.

5. The end plate assembly according to claim 2 is characterized in that the curling structure includes a first wall body, a second wall body and a third wall body which are connected at angles in sequence along its own bending direction, the first wall body, the second wall body and the third wall body are arranged to form a accommodating cavity, the first wall body and the third wall body are arranged relatively to each other along a second direction, the first wall body is connected to the first plate body, and one end of the third wall body which faces away from the second wall body is against the filling structure or has a gap, and the second direction is parallel to the arrangement direction of the first end plate and the second end plate.

6. The end plate assembly according to claim 5, characterized in that the second plate body protrudes from opposite ends of the filling structure along the first direction, and the third wall body is attached to and connected to the second plate body.

7. The end plate assembly according to claim 5, characterized in that at least a portion of the first wall protrudes from the first plate body along a direction from the second end plate to the first end plate.

8 . The end plate assembly according to claim 5 , wherein at least a portion of the second wall protrudes from the second end plate along the first direction.

9 . The end plate assembly according to claim 5 , wherein the first wall body and the second wall body are smoothly transitioned.

10. An end plate assembly according to any one of claims 5-9, characterized in that the curling structure also includes at least one fourth wall body, the fourth wall body is connected to at least one end of the third wall body in a third direction at an angle, the fourth wall body covers at least part of the accommodating cavity, and is provided with a first through hole for the target connecting part to pass through, and the third direction, the first direction and the second direction intersect each other.

11. The end plate assembly according to claim 10, characterized in that the number of the fourth wall bodies is two, the two fourth wall bodies are connected to two opposite ends of the third wall body in the third direction, and the two first through holes are aligned along the third direction.

12 . The end plate assembly according to claim 10 , wherein a projection of the fourth wall on the first wall along the third direction covers at least a portion of the first wall and abuts against or has a gap with an end of the first wall.

13. The end plate assembly according to any one of claims 5 to 12, further comprising a support member, at least a portion of which is located in the accommodating cavity and connected to the first wall body and the third wall body.

14. The end plate assembly according to claim 13, wherein the support member comprises a support body and protrusions disposed on opposite sides of the support body along the second direction,

The first wall body and the third wall body are both provided with a second through hole, and the protrusion is plug-fitted into the second through hole.

15. The end plate assembly according to claim 14, wherein when the curling structure comprises a fourth wall, the fourth wall protrudes from the first wall along the direction from the second end plate to the first end plate,

The plurality of protrusions arranged on the supporting body include a first protrusion, which is plugged into and fits with the first wall and protrudes from the first wall, and the first protrusion is spaced apart from the fourth wall to form a limiting space for limiting the limiting belt.

16. The end plate assembly according to any one of claims 2 to 15, characterized in that a side of the second plate body facing away from the filling structure is flat.

17. The end plate assembly according to any one of claims 2 to 16, characterized in that the filling structure comprises a plurality of staggered reinforcing ribs, and the plurality of reinforcing ribs and the second plate body are arranged to form a plurality of grooves opening toward the first end plate.

18. The end plate assembly according to any one of claims 2 to 16, wherein the filling structure is a solid structure.

19. The end plate assembly according to any one of claims 1-18, characterized in that the first plate body has two ends facing each other in a third direction, the curling structure extends from one end of the first plate body to the other end, and the first direction and the third direction intersect.

20. The end plate assembly according to any one of claims 1-19 is characterized in that the first plate body includes a base plate and a first protrusion, the first protrusion protrudes from the base plate along the direction from the second end plate to the first end plate, a recessed space is formed on the side of the first protrusion facing the second end plate, and the second end plate is attached to the base plate and the first protrusion.

21. The end plate assembly according to claim 20 is characterized in that the number of the first protrusions is multiple, the multiple first protrusions are arranged at intervals along the third direction and extend along the first direction, the third direction and the second direction intersect with the first direction in pairs, and the second direction is parallel to the arrangement direction of the first end plate and the second end plate.

22. The end plate assembly according to any one of claims 1-21, characterized in that one of the first end plate and the second end plate is provided with a limiting protrusion, and the other is provided with a limiting hole, and the limiting protrusion and the limiting hole are plug-fitted.

23. The end plate assembly according to claim 2, wherein the second plate body is an insulating member.

24. A battery module, comprising:

The end plate assembly according to any one of claims 1 to 23;

The module body includes a plurality of battery cells, which are arranged in sequence along a second direction. The end plate assembly is arranged at least at one end of the module body in the second direction, and the second direction is parallel to the arrangement direction of the first end plate and the second end plate.

25 . The battery module according to claim 24 , further comprising a limiting belt, wherein the limiting belt sleeves the module body and the end plate assembly together.

26. A battery, characterized by comprising the battery module according to claim 24 or 25.

27. An electrical device, comprising the battery as claimed in claim 26, wherein the battery is used to provide electrical energy.