CN114583398A - Busbar, electric core acquisition assembly and battery module - Google Patents

Abstract

The invention belongs to the technical field of batteries, and discloses a bus bar, a battery cell collection component and a battery module. The bus bar is used to electrically connect a plurality of cells to form a cell group, and the bus bar includes a plurality of bus bar bodies, a base material and pins. Each bus bar body includes a first conductive portion and a second conductive portion, the first conductive portion is electrically connected to the first electrode of one cell, and the second conductive portion is electrically connected to the second electrode of the other cell. The first conductive portion and the second conductive portion are electrically connected through the connecting portion, and the adjacent busbar main bodies are electrically connected through the base material. The pins are connected to the main body of the bus bar for data connection with the BMS. The busbar has a simple structure and good versatility. It is connected to the BMS by setting pins, and no FPC/FFC transfer is required, which reduces the weight of the battery module and occupies a small space in the battery system. The energy density of the battery module formed by the connection big.

Description

A busbar, cell collection component and battery module

technical field

The invention relates to the technical field of batteries, in particular to a bus bar, a battery cell collection component and a battery module.

Background technique

The battery module is the core component of the battery system. The battery module includes a plurality of cells, and a bus bar is usually used to electrically connect the cells between the plurality of cells.

Most of the busbar structures in the prior art have complex shapes and are difficult to manufacture. In order to collect signals such as voltage or temperature of the cell, it is usually necessary to use FPC (Flexible Printed Circuit, flexible circuit board)/FFC (Flexible Flat Cable, flexible flat cable) , lead out a nickel sheet on the FPC/FFC and weld it on the bus bar, the nickel sheet collects the voltage or temperature signal of the cell, and then transmits the signal to the BMS (Battery Management System, battery management system), and the setting of FPC/FFC is increased. The production cost of the battery system is increased, and the assembly process is complicated, which occupies too much space inside the battery system, and the overall space utilization rate is low.

Therefore, there is an urgent need to propose a busbar with a simple structure, which is beneficial to increase the energy density of the battery module, to solve the above problems.

SUMMARY OF THE INVENTION

One object of the present invention is to provide a busbar, which has a simple structure, and is connected to a signal acquisition element by setting pins without using FPC/FFC switching, thereby reducing the weight of the battery module and occupying space in the battery system Small, the battery module formed by connection has high energy density.

For this purpose, the present invention adopts the following technical solutions:

A bus bar for electrically connecting a plurality of battery cells to form a battery cell group, comprising:

A plurality of busbar bodies, each of which includes a first conductive portion and a second conductive portion, the first conductive portion is electrically connected to the first electrode of one of the battery cells, and the second conductive portion is electrically connected to the second electrode of the other battery core, and the first conductive portion and the second conductive portion are electrically connected through a connecting portion;

a base material, through which the adjacent busbar main bodies are electrically connected;

pins, the pins are connected to the main body of the bus bar and are used for data connection with the battery management system.

Optionally, the pins are in a sheet-like structure.

Optionally, the pin includes a first part and a second part, the first part and the second part are connected at an angle, the busbar main body is connected to the first part, the battery management A system is connected to the second part.

Optionally, the first part is parallel to the end face of the battery cell, and the second part extends along the height direction of the battery core.

Optionally, the pins are connected to the main body of the bus bar at at least one end of the two ends of the bus bar.

Optionally, the bus bar is an integral structure.

Optionally, an insulating layer is provided on the surface of the connecting portion and the base material.

Optionally, both ends of the base material are respectively connected to the connecting portions of two adjacent busbar bodies.

Optionally, the base material includes a main body segment and two connection segments, the two connection segments are connected by the main body segment, the connection segment and the main body segment are arranged at an angle, and the bus bar The main body is connected to the connecting segment.

Optionally, a through hole is provided at the connection between the connecting section and the main body section.

Optionally, the connection between the connecting section and the main body section is rounded.

Optionally, the base material and the busbar body are connected to form a wave shape, and the busbar body is located on a wave crest or a wave trough.

Optionally, the adjacent bus bar main bodies are arranged at intervals along a first direction, and are arranged in a staggered manner along a second direction, and the first direction and the second direction are arranged at an included angle.

Optionally, there is a height difference between the first conductive portion and the second conductive portion.

Another object of the present invention is to provide a cell collection assembly, which does not require FPC/FFC switching, saves the internal space of the battery pack, and is beneficial to improve the energy density of the battery pack.

For this purpose, the present invention adopts the following technical solutions:

A battery cell collection assembly includes a signal collection element and the above-mentioned bus bar, and the pins are data-connected with the signal collection element.

Optionally, the signal acquisition element is a temperature sensor.

Optionally, a voltage signal summary board is connected to the pins.

Another object of the present invention is to provide a battery module, in which the cells are closely arranged, the energy density is high, the weight is light, and the safety performance is high.

For this purpose, the present invention adopts the following technical solutions:

A battery module includes a plurality of battery cells and at least one of the above-mentioned battery cell collection components, and a bus bar of the battery cell collection component electrically connects the plurality of battery cells.

Beneficial effects:

The bus bar provided by the present invention is electrically connected to the first electrode of the cell by providing the first conductive portion, the second conductive portion is electrically connected to the second electrode of the cell, and the first conductive portion and the second conductive portion are connected through the connecting portion Electrically connecting, and then electrically connecting a plurality of busbar main bodies through a base material, so that a plurality of battery cells are connected in series or in parallel to form a battery cell group. The use of pins to connect the BMS eliminates the use of FPC/FFC, saves the internal space of the battery system, thereby improving the energy density of the battery system, and at the same time, improves the integration degree of the electrical connection of the battery cells, reduces the weight of the battery system, and the bus bar The structure is simple, the manufacture and assembly are convenient, and the production cost is low.

The battery cell acquisition assembly provided by the present invention includes the above-mentioned bus bar. By setting pins at one end of the bus bar, the pins are used for data connection with the BMS directly, without using FPC/FFC for switching, saving the Z-direction space of the battery system. It is also beneficial to realize the lightweight of the battery system.

The battery module provided by the present invention adopts the above-mentioned cell collection assembly, connects a plurality of cells in series or in parallel through the busbar of the cell collection assembly, and connects the BMS through pins, with a high degree of integration. By disposing an insulating layer to avoid conductive contact between the bus bars, the risk of short circuit between the bus bars is reduced, and the complex bus bar structure and the plastic wire harness isolation plate structure in the prior art are replaced. The connection between the busbar and the cell is convenient and reliable, the structure is simple, the current loss is small, the heat generation is low, and the safety performance is high. The bus bars and pins are light in weight, saving the internal space of the battery system. The structural form can make a plurality of battery cells compactly arranged, which greatly improves the energy density of the battery module, and the manufacturing cost of the battery module is low.

Description of drawings

Fig. 1 is the structural representation of the busbar provided by the present invention;

FIG. 2 is an assembly diagram of the bus bar and the cell provided by the present invention.

In the picture:

100, cell; 110, first electrode; 120, second electrode; 200, main body of bus bar; 210, first conductive part; 220, second conductive part; 230, connection part; 300, base material; 310, main body segment; 320, connection segment; 330, through hole; 400, pin; 500, signal acquisition element; 600, voltage signal summary board.

Detailed ways

The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the accompanying drawings, which is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation or a specific orientation. construction and operation, and therefore should not be construed as limiting the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed to indicate or imply relative importance. Wherein, the terms "first position" and "second position" are two different positions, and the first feature being "above", "over" and "above" the second feature includes the first feature being "over" the second feature Directly above and diagonally above, or simply means that the first feature is level higher than the second feature. The first feature is "below", "below" and "below" the second feature includes the first feature being directly below and diagonally below the second feature, or simply means that the first feature has a lower level than the second feature.

In the description of the present invention, it should be noted that the terms "installed", "connected" and "connected" should be understood in a broad sense, unless otherwise expressly specified and limited, for example, it may be a fixed connection or a detachable connection Connection, or integral connection; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium, can be internal communication between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood in specific situations.

The following describes in detail the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals refer to the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary, only used to explain the present invention, and should not be construed as a limitation of the present invention.

FIG. 1 is a schematic structural diagram of a bus bar provided in this embodiment. FIG. 2 is an assembly diagram of the bus bar and the battery cell 100 provided in this embodiment. Referring to FIG. 1 and FIG. 2 , the bus bar is used to electrically connect a plurality of cells 100 to form a cell group, and the bus bar includes a plurality of bus bar bodies 200 , a base material 300 and pins 400 . Each bus bar body 200 includes a first conductive portion 210 and a second conductive portion 220 , the first conductive portion 210 is electrically connected to the first electrode 110 of one cell 100 , and the second conductive portion 220 is electrically connected to the first electrode 110 of the other cell 100 . The second electrode 120 is electrically connected, and the first conductive portion 210 and the second conductive portion 220 are electrically connected through the connection portion 230 . The adjacent bus bar bodies 200 are electrically connected through the base material 300 . The pins 400 are connected to the bus bar body 200 for data connection with the BMS. In this embodiment, the first electrode is a positive electrode, and the second electrode is a negative electrode. In other embodiments, the first electrode is a negative electrode, and the second electrode is a positive electrode, which can be set according to actual needs.

The above-mentioned bus bar is electrically connected by the first conductive portion 210 of the bus bar main body 200 and the first electrode 110 of the battery cell 100 , and the second conductive portion 220 and the second electrode 120 of the battery cell 100 are electrically connected through the base material 300 The two adjacent bus bar bodies 200 are electrically connected, so as to realize parallel or series connection of a plurality of battery cells 100 to form a battery cell group. Signal acquisition is achieved by arranging pins 400 on the main body 200 of the bus bar. The busbar adopts this structure, which has a simple structure and small footprint. The pin 400 can be connected to the BMS, and the information such as voltage and temperature of the cells connected to the busbar can be directly transmitted to the BMS, thereby replacing the traditional FPC/FFC. , thereby reducing the use of components, reducing the weight of the battery system, and at the same time, saving the use of the Z-direction space of the battery system, and improving the energy density of the battery system.

Continue to refer to Fig. 1 and Fig. 2, the busbar as a whole is a sheet-like structure, and the sheet-like structure can greatly reduce the weight of the busbar, reduce the overall weight of the battery module, and minimize the amount of the busbar in the battery system. The space occupied is beneficial to improve the energy density of the battery module. The bus bar can be an integral structure, which is made by stamping or other processes, or a split structure, and the components are connected by welding or bonding. In this embodiment, the corners of the busbar body 200 are all rounded, and the rounded corners can reduce stress concentration and increase the structural strength of the busbar body 200 . Of course, the shape of the bus bar body 200 is not limited to this, and can be set to other shapes as required. The material of the bus bar body 200 may be metal materials such as aluminum (alloy), copper (alloy), nickel, or other conductive materials. The bus bar main body 200 in this embodiment has a simple structure, is easy to process, and is easy to connect with the battery cell 100 .

Further, the pin 400 is a sheet-like structure, including a first part and a second part, the first part and the second part are connected at an angle, the bus bar body 200 is connected to the first part, and the battery management system is connected to the second part . In this embodiment, in order to facilitate the layout of components in the battery system, the first part is parallel to the end face of the battery cell 100 , and the second part extends along the height direction of the battery cell 100 , that is, the first part and the second part are vertically connected form an L shape. Optionally, according to the internal space layout of the battery system, the second portion extends downward along the height direction of the battery cell 100 . In this embodiment, the first part and the second part are both in-line, and in other embodiments, they may also be in other shapes. The angle between the first part and the second part can be 0°, and the connection can form a straight line, or it can be other angles, which can be set according to the internal space layout of the battery system. The pins 400 are connected to the main body 200 of the bus bar at least at one end of the two ends of the bus bar. Further, the second part is arranged outside the cell group and connected to the connecting part 230 to facilitate connection with the signal acquisition element. In other embodiments, the second part may also be arranged between two adjacent rows of cells 100 or at other positions, which can be arranged according to actual needs. It can be understood that the pins 400 are made of conductive material, and can be integrally formed with the connecting portion 230 by stamping, or can be fixedly connected by welding or riveting.

Further, in order to effectively avoid the risk of short circuit due to contact between the bus bars, an insulating layer is provided on the surface of the connection portion 230 and the substrate 300 . By providing insulating layers on the surfaces of the base material 300 and the connecting portion 230 , the safety of the battery system is improved. The arrangement of the insulating layer can replace the plastic wire harness isolation plate in the prior art, which saves its internal space compared with the traditional battery system, thereby effectively improving the energy density of the battery system. At the same time, the insulating layer is arranged on the surface of the base material 300 and the connection part 230, which improves the integration degree of the electrical connection of the battery cell 100, reduces the number of parts used, thereby reduces the weight of the battery system and reduces its heat generation. Manufacturing has also been simplified and production costs reduced. Optionally, the insulating layer is an insulating film coated on the surface of the connecting portion 230 and the base material 300, such as a PET blue film, which can also be made by spraying insulating materials on the connecting portion 230 and the base material 300, or other methods. , as long as it is a structure capable of insulating the connection portion 230 and the base material 300 , it is within the protection scope of the present application.

Further, the first conductive portion 210 and the battery cell 100 and the second conductive portion 220 and the battery cell 100 may be connected by welding. Since there is a certain height difference between the two electrodes of the battery cell 100 , in order to match the structure of the battery cell 100 , the connecting portion 230 and the first conducting portion 210 are in the same plane, and the second conducting portion 220 and the connecting portion are in the same plane. The 230 is arranged in a stepped shape, so as to facilitate the connection between the bus bar main body 200 and the battery cell 100 .

Further, the adjacent bus bar bodies 200 are arranged at intervals along the first direction, and are arranged in a staggered manner along the second direction, and the first direction and the second direction are arranged at an included angle. In this embodiment, the first direction is the width direction of the bus bar body 200 , the second direction is the length direction of the bus bar body 200 , the first direction and the second direction are perpendicular, that is, two adjacent bus bar bodies 200 are Its length direction is misaligned. With this structural design, the connected cells 100 are arranged alternately in dislocation, and the cells 100 in a cell group are arranged in a dislocation, so that a plurality of cells 100 can be closely spliced together, so as to make full use of the internal space of the battery system , to improve the energy density of the battery module. In other embodiments, the first direction and the second direction are set as required. Of course, the bus bar bodies 200 can also be arranged side by side along a straight line, so that the connected cell groups are arranged in a matrix.

Further, both ends of the base material 300 are respectively connected to the connecting portions 230 of two adjacent bus bar bodies 200 , so as to facilitate the installation of the insulating layer. In this embodiment, the base material 300 and the bus bar main body 200 are connected to form a wave shape, and the bus bar main body 200 is located on the crest or the trough of the wave. The base material 300 includes a main body section 310 and two connecting sections 320. The two connecting sections 320 are connected by the main section 310. The bus bar main body 200 is connected to the connecting sections 320. The connecting sections 320 and the main section 310 are arranged at an angle. , so that the bus bar main body 200 can be dislocated. In other embodiments, the substrate 300 may also have an inline structure or other structural forms, as long as it is a structural form capable of electrically connecting adjacent bus bar bodies 200 , it is within the protection scope of the present application.

Further, through holes 330 may be provided on the main body section 310 for positioning and increasing structural strength. Rounding is performed at the connection between the main body section 310 and the connection section 320 to reduce stress concentration and make the connection more reliable. The material of the base material 300 may be a metal material such as aluminum (alloy), copper (alloy), nickel, or other conductive materials. The materials of the base material 300 and the bus bar body 200 may be the same or different. The base material 300 and the bus bar main body 200 may be integrally formed by stamping, or may be fixedly connected by welding or riveting.

Continuing to refer to FIG. 2 , this embodiment further provides a cell collection component, including the above-mentioned bus bar and the signal collection element 500 , and the pins 400 and the signal collection element 500 are connected in data. The signal collection element 500 can be a temperature sensor, of course, it can also be a voltage collection element, a pressure sensor, a humidity sensor, etc. The signal collection element 500 is connected to the BMS to output cell information. Further, the pin 400 can be connected to the voltage signal summarizing board 600, and the voltage signal summarizing board 600 is connected to the BMS, so as to output the voltage information of the cell.

This embodiment also provides a battery module, which includes a plurality of battery cells 100 and at least one of the above-mentioned battery cell collection components, and the battery cells 100 are electrically connected by a bus bar of the battery cell collection component. The BMS is connected through pins, which has a high degree of integration. The bus bar and the pins 400 adopt a thin sheet structure, which is light in weight and saves the internal space of the battery system. Its structural form enables a plurality of battery cells 100 to be compactly arranged, which greatly improves the energy density of the battery module, and the manufacturing cost of the battery module is low. By disposing the insulating layer to avoid the conductive contact between the bus bars, the risk of short circuit is reduced, and the complex bus bar structure and the plastic wire harness isolation plate structure in the prior art are replaced. The busbars at the output of the cell pack can be cut out of complete busbars or produced individually. The battery cell 100 and the BMS are connected through the pin 400 for data connection, which is convenient and reliable. The battery module has a simple structure, less current loss, low heat generation and high safety performance.

Obviously, the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those of ordinary skill in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. There is no need and cannot be exhaustive of all implementations here. Any modification, equivalent replacement and improvement made within the spirit and principle of the present invention shall be included within the protection scope of the claims of the present invention.

Claims (18)

1. A bus bar for electrically connecting a plurality of battery cells (100) to form a battery cell group, characterized in that, comprising: A plurality of bus bar bodies (200), each of the bus bar bodies (200) includes a first conductive part (210) and a second conductive part (220), the first conductive part (210) and one of the The first electrode (110) of the battery cell (100) is electrically connected, the second conductive part (220) is electrically connected with the second electrode (120) of the other battery core (100), and the first conductive part (210) is electrically connected with the second conductive portion (220) through a connecting portion (230); a base material (300), the adjacent busbar main bodies (200) are electrically connected through the base material (300); A pin (400), the pin (400) is connected to the busbar body (200) for data connection with the battery management system. 2 . The bus bar according to claim 1 , wherein the pins ( 400 ) are of sheet-like structures. 3 . 3. The busbar according to claim 1, wherein the pin (400) comprises a first part and a second part, the first part and the second part are connected at an angle, and the The busbar body (200) is connected to the first part, and the battery management system is connected to the second part. 4. The busbar according to claim 3, characterized in that the first part is parallel to the end face of the cell (100), and the second part extends along the height direction of the cell (100). . 5. The busbar according to claim 1, wherein the pins (400) are connected to the busbar body (200) on at least one end of the two ends of the busbar. 6 . The bus bar according to claim 1 , wherein the bus bar is an integral structure. 7 . 7. The bus bar according to claim 1, wherein an insulating layer is provided on the surface of the connecting portion (230) and the base material (300). 8 . The bus bar according to claim 1 , wherein two ends of the base material ( 300 ) are respectively connected to the connecting portions ( 230 ) of two adjacent bus bar main bodies ( 200 ). 9 . 9. The busbar according to any one of claims 1-8, wherein the base material (300) comprises a main body section (310) and two connecting sections (320), the two connecting sections ( 320) are connected by the main body section (310), the connection section (320) and the main body section (310) are arranged at an angle, and the busbar main body (200) is connected to the connection section (320) ). 10. The bus bar according to claim 9, characterized in that, a through hole (330) is provided at the connection between the connecting segment (320) and the main body segment (310). 11. The bus bar according to claim 9, characterized in that, the connection between the connection section (320) and the main body section (310) is rounded. 12. The busbar according to any one of claims 1-8, wherein the base material (300) and the busbar body (200) are connected to form a wave shape, and the busbar body (200) on the crest or trough of the wave. 13. The busbar according to any one of claims 1-8, wherein the adjacent busbar bodies (200) are arranged at intervals along a first direction, and are arranged in a dislocation along a second direction, and the first direction It is arranged at an included angle with the second direction. 14. The bus bar according to any one of claims 1-8, wherein there is a height difference between the first conductive portion (210) and the second conductive portion (220). 15. A cell collection assembly, characterized in that it comprises a signal collection element (500) and the busbar according to any one of claims 1-14, the pin (400) and the signal collection element ( 500) Data connection. 16. The cell collection assembly according to claim 15, wherein the signal collection element (500) is a temperature sensor. 17. The cell collection assembly according to claim 15, characterized in that, a voltage signal summary board (600) is connected to the pins (400). 18. A battery module, characterized by comprising a plurality of cells (100) and at least one cell collection assembly according to any one of claims 15-17, wherein the busbars of the cell collection assembly connect A plurality of the battery cells (100) are electrically connected.

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