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WO2018126438A1 - Structure de couvercle supérieur de batterie d'alimentation, batterie d'alimentation et module de batterie - Google Patents

Structure de couvercle supérieur de batterie d'alimentation, batterie d'alimentation et module de batterie Download PDF

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Publication number
WO2018126438A1
WO2018126438A1 PCT/CN2017/070418 CN2017070418W WO2018126438A1 WO 2018126438 A1 WO2018126438 A1 WO 2018126438A1 CN 2017070418 W CN2017070418 W CN 2017070418W WO 2018126438 A1 WO2018126438 A1 WO 2018126438A1
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WO
WIPO (PCT)
Prior art keywords
connecting block
top cover
limiting
electrode assembly
power battery
Prior art date
Application number
PCT/CN2017/070418
Other languages
English (en)
Chinese (zh)
Inventor
李全坤
朱凌波
郭剑
王鹏
朱涛声
Original Assignee
宁德时代新能源科技股份有限公司
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 宁德时代新能源科技股份有限公司 filed Critical 宁德时代新能源科技股份有限公司
Priority to PCT/CN2017/070418 priority Critical patent/WO2018126438A1/fr
Priority to CN201780070006.8A priority patent/CN109964336B/zh
Publication of WO2018126438A1 publication Critical patent/WO2018126438A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/147—Lids or covers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries

Definitions

  • the present application relates to the field of energy storage devices, and in particular, to a power battery top cover structure, a power battery, and a battery module.
  • the Busbar is made thicker, basically in the range of 2 to 3 mm. To achieve easy deformation, it is necessary to make an " ⁇ " shape with a high arch in the middle. Thus, for the same module space, since the portion of the Busbar arch occupies a large space in the height direction, the space available for the battery is reduced.
  • the application provides a power battery top cover structure, a power battery and a battery module, which can solve the above problems.
  • a first aspect of the embodiment of the present application provides a power battery top cover structure, including a top cover sheet, a first electrode assembly, a second electrode assembly, a first flexible electrical connector, a first connecting block, and a first limiting member ,
  • the first electrode assembly and the second electrode assembly are both attached to the top cover sheet, and At least one of the first electrode assembly and the second electrode assembly is insulated from the top cover sheet,
  • the first connecting block is located above the first electrode assembly, and the first connecting block is electrically connected to the first electrode assembly through the first flexible electrical connector, and the first flexible electrical connector is provided a first electrode assembly connecting portion, a first deformation portion, and a first connecting block connecting portion, the first electrode assembly connecting portion being electrically connected to the first electrode assembly, the first connecting block connecting portion and the first The connection block is electrically connected, and the first deformation portion connects the first electrode assembly connection portion and the first connection block connection portion,
  • the first connecting block is displaceable relative to the first electrode assembly under an external force, and the first connecting block connecting portion is movable together with the first connecting block and pulling the first deformation portion Deformation,
  • the first connecting block is provided with a first limiting engaging portion, the first limiting engaging portion is coupled with the first limiting member, and the first limiting member can limit the first connecting block The amount of movement.
  • the three-dimensional Cartesian coordinate system includes an X-axis, a Y-axis, and a Z-axis perpendicular to each other, and the length direction of the top cover sheet is an X-axis, a width direction is a Y-axis, and a thickness direction is a Z-axis.
  • the first limiting portion is a first limiting hole
  • the first limiting member includes a first limiting post and a first limiting cap
  • the first limiting post is fixed relative to the top cover sheet And being fixedly connected to the first limiting cap after passing through the first limiting hole along the Z axis, wherein the first limiting cap is located in the first connecting block away from the top cover piece side.
  • the diameter of the first limiting hole is larger than the diameter of the first limiting column.
  • an annular gap can be formed between the first limiting hole and the first limiting post.
  • the first limiting post and the first limiting hole are relatively movable along the Z axis.
  • the first limiting hole is provided with a blocking portion for blocking the first limiting cap from being disengaged from the first limiting hole from below.
  • the first limiting cap is located in the first limiting hole, and an upper surface of the first limiting cap does not exceed an upper surface of the first connecting block.
  • the number of the first limiting members is plural, and the first connecting block is provided with a plurality of the first limiting engaging portions.
  • the first limiting member is coupled to the first limiting engagement portion one by one.
  • the number of the first limiting member and the first limiting engaging portion is an even number, and Symmetrical distribution on both sides of the first flexible electrical connector along the X axis.
  • the first flexible electrical connector further has a first extension, and the first extension is located on the first deformation.
  • a first receiving cavity is defined between the first connecting block and the first electrode assembly, the first electrode assembly connecting portion is located in the first receiving cavity, and the first deformation portion extends along the Y axis Out of the first receiving cavity, the first extension is located outside the first receiving cavity and extends along the X axis.
  • the first deformation portion is provided with at least one first bending portion, and the projection of the first bending portion in the YZ plane is a bending structure.
  • At least one of the first bent portions protrudes from the first receiving cavity along a Y axis, and the first extending portion is coupled to the first bent portion.
  • the first connecting block connecting portion further includes a first connecting block auxiliary connecting portion
  • the first electrode assembly connecting portion further includes a first electrode assembly auxiliary connecting portion
  • the first connecting block auxiliary connecting portion extends to a side of the first extending portion
  • the first electrode assembly auxiliary connecting portion extends to a side of the first extension.
  • the first connecting block connecting portion is fixedly connected to an upper surface or a lower surface of the first connecting block.
  • an upper surface of the first connecting block has a first connecting groove, the first connecting groove extends to an edge of the first connecting block, and the first connecting block connecting portion is fixed to the first connection a groove, and the upper surface of the first connecting block connecting portion after the connecting does not exceed the upper surface of the first connecting block.
  • the first limiting member is fixed on the top cover sheet.
  • the first limiting member is fixed on the first electrode assembly.
  • the first flexible electrical connector is a sheet-like structure.
  • the first flexible electrical connector comprises a plurality of flexible connecting pieces, and the plurality of flexible connecting pieces are sequentially stacked and fixedly connected to each other at least at both ends.
  • a second aspect of an embodiment of the present application provides a power battery including the power battery top cover structure.
  • a third aspect of the embodiments of the present application provides a battery module including a bus bar and a plurality of the power batteries, and the plurality of first connection blocks are electrically connected by the bus bar.
  • the bus bar is a straight plate structure, and an upper surface of the first connecting block and the sink The flow row fits the connection.
  • the power battery top cover structure provided by the embodiment of the present application can displace the first connecting block relative to the first electrode assembly under external force, and perform relative displacement to absorb the force between the bus bar and the bus bar.
  • the power battery top cover structure provided by the example can use the bus bar of the straight plate structure to perform series or parallel connection of the power batteries, thereby improving the space utilization rate of the battery module.
  • FIG. 1 is a schematic top plan view of a power battery top cover structure according to Embodiment 1 of the present application;
  • FIG. 2 is a schematic exploded view of a first power battery top cover structure according to Embodiment 1 of the present application;
  • FIG. 3 is a cross-sectional structural view of the power battery top cover structure shown in FIG. 2 taken along line A-A of FIG. 1;
  • FIG. 4 is a schematic exploded view of a second power battery top cover structure according to Embodiment 1 of the present application.
  • Figure 5 is a cross-sectional structural view of the power battery top cover structure shown in Figure 4 taken along line A-A of Figure 1;
  • Figure 6 is a cross-sectional structural view of the power battery top cover structure shown in Figure 4 taken along line B-B of Figure 1;
  • Figure 7 is a cross-sectional structural view of the power battery top cover structure shown in Figure 4 taken along line C-C of Figure 1;
  • FIG. 8 is a schematic exploded view of a third power battery top cover structure according to Embodiment 1 of the present application.
  • Figure 9 is a cross-sectional structural view of the power battery top cover structure of Figure 8 taken along line A-A of Figure 1;
  • Figure 10 is a cross-sectional structural view of the power battery top cover structure of Figure 8 taken along line B-B of Figure 1;
  • Figure 11 is a cross-sectional structural view of the power battery top cover structure of Figure 8 taken along line C-C of Figure 1;
  • FIG. 12 is a schematic exploded view of a fourth power battery top cover structure according to Embodiment 1 of the present application.
  • Figure 13 is a cross-sectional view of the power battery top cover structure shown in Figure 12 taken along line A-A of Figure 1 Figure
  • FIG. 14 is a schematic exploded view of a fifth power battery top cover structure according to Embodiment 1 of the present application.
  • 15 is a side view showing the first flexible electrical connector/second flexible electrical connector of the first embodiment of the present application.
  • FIG. 16 is a side view showing the structure of a second first flexible electrical connector according to Embodiment 1 of the present application.
  • Figure 17 is a partial cross-sectional view of the power battery cap structure employing the first flexible electrical connector of Figure 16 taken along the line A-A of Figure 1 in the vicinity of the first electrode assembly;
  • FIG. 18 is a side view showing a structure of a third first flexible electrical connector according to Embodiment 1 of the present application.
  • Figure 19 is a partial cross-sectional view of the power battery top cover structure of the first flexible electrical connector shown in Figure 18 taken along the line A-A of Figure 1 in the vicinity of the first electrode assembly;
  • FIG. 20 is a side view showing a structure of a fourth first flexible electrical connector/second flexible electrical connector according to Embodiment 1 of the present application;
  • Figure 21 is a partial cross-sectional view of the power battery top cover structure of the first flexible electrical connector shown in Figure 20 taken along the line A-A of Figure 1 in the vicinity of the first electrode assembly;
  • Figure 22 is a partial cross-sectional view of the power battery cap structure employing the first flexible electrical connector of Figure 20 taken along line B-B of Figure 1 in the vicinity of the first electrode assembly;
  • FIG. 23 is a top plan view showing the structure of a first power battery top cover according to Embodiment 2 of the present application.
  • FIG. 24 is a schematic exploded view of a first power battery top cover structure according to Embodiment 2 of the present application.
  • Figure 25 is a cross-sectional structural view of the power battery top cover structure of Figure 24 taken along line A-A of Figure 23;
  • 26 is a schematic top plan view of a second power battery top cover structure according to Embodiment 2 of the present application.
  • FIG. 27 is a schematic exploded view of a second power battery top cover structure according to Embodiment 2 of the present application.
  • Figure 28 is a cross-sectional view showing the power battery top cover structure shown in Figure 27 taken along line A-A of Figure 26; intention;
  • FIG. 29 is a schematic structural diagram of a first flexible electrical connector/second flexible electrical connector according to Embodiment 2 of the present application.
  • FIG. 30 is a schematic top plan view of a power battery top cover structure according to Embodiment 3 of the present application.
  • FIG. 31 is a schematic exploded view of a power battery top cover structure according to Embodiment 3 of the present application.
  • FIG. 32 is a cross-sectional structural view of the power battery top cover structure shown in FIG. 31 taken along line A-A of FIG.
  • the embodiment of the present application defines an X-axis, a Y-axis, and a Z-axis which are perpendicular to each other in a three-dimensional orthogonal coordinate system.
  • the embodiment of the present application provides a power battery top cover structure including a first electrode.
  • the top cover sheet 30 has an X-axis in the longitudinal direction, a Y-axis in the width direction, and a Z-axis in the thickness direction.
  • the first electrode assembly 10, the first flexible electrical connector 12 and the first connection block 14 are responsible for one pole output of the power battery, and the second electrode assembly 20, the second flexible electrical connector 22 and the second connection block 24 are responsible for the power battery The other pole output.
  • the first electrode assembly 10 is connected to the positive electrode of the power battery
  • the second electrode assembly 20 is connected to the negative electrode of the power battery as an example.
  • the first electrode assembly 10 is The connection objects of the second electrode assembly 20 can also be interchanged. It should be noted that the self-structures of the first electrode assembly 10 and the second electrode assembly 20 described below may also be reversed according to the exchange of their connection objects.
  • the first electrode assembly 10 is sealingly connected to the top cover sheet 30 to prevent liquid leakage, and at the same time, the first electrode assembly 10 and the top cover sheet 30 can be insulated and electrically connected.
  • the first electrode assembly 10 is electrically connected to the top cover sheet 30 to positively charge the top cover sheet 30 to prevent the top cover sheet 30 from being corroded.
  • the second electrode assembly 20 is electrically insulated from the top cover sheet 30 to prevent the positive and negative electrodes of the power battery from being directly turned on. Of course, sealing is also required to prevent leakage.
  • the first connection block 14 is located above the first electrode assembly 10 as a component connected to the bus bar.
  • the position of the first connecting block 14 is not fixed, but can be moved within a certain range.
  • the first flexible electrical connector 12 is used to ensure electrical conduction between the first electrode assembly 10 and the first connecting block 14 after the position of the first connecting block 14 is changed.
  • the first flexible electrical connector 12 is provided with a first electrode assembly connecting portion 120, a first connecting block connecting portion 122, and a first deforming portion (not labeled), the first electrode
  • the component 10 is electrically connected to the first electrode assembly connecting portion 120.
  • the first connecting block 14 is electrically connected to the first connecting block connecting portion 122, and the first deforming portion connects the first electrode assembly connecting portion 120 and the first connecting block connecting portion 122.
  • the first deformation portion has a flexible deformation ability and is deformable by an external force.
  • the bus bar When a plurality of power batteries using the power battery top cover structure form a battery module, the bus bar is simultaneously connected to the upper surfaces of the plurality of first connecting blocks 14 by the bus bar, because the first connecting block 14 and the bus bar are fixed. Connected together, the bus bar adopts a straight plate structure that is not easily deformed, so that the first connecting block 14 is fixed at this time, and when the power battery expands, if the power battery top cover structure of the prior art is used (the first electrode assembly The relative displacement between the first connecting block 14 and the first connecting block 14 is not generated. As the expansion force increases, the breaking occurs in the weak area (for example, at the junction of the bus bar and the first connecting block 14), so that the power battery cannot be output. With the power battery top cover structure of the embodiment of the present application, since the relative displacement between the first connecting block 14 and the first electrode assembly 10 occurs, the power battery does not affect its output when it expands.
  • the first connecting block 14 when the first connecting block 14 is relatively displaced relative to the top cover sheet 30, since the first connecting block connecting portion 122 is connected with the first connecting block 14, the first connecting block is connected.
  • the portion 122 will move together with the first connecting block 14, and at this time, the first electrode assembly 10 is fixed relative to the top cover sheet 30, so the first electrode assembly connecting portion 120 is also Immobilized, such that a relative displacement occurs between the first electrode assembly connecting portion 120 and the first connecting block connecting portion 122, and the offset of the relative displacement is absorbed and supplemented by the deformation of the first deforming portion, thereby avoiding
  • the first flexible electrical connector 12 breaks directly and loses electrical conductivity.
  • the first flexible electrical connector 12 In the use of the power battery, a large current is often used. In order to ensure the overcurrent capability, the first flexible electrical connector 12 generally needs to have a large overcurrent area, and the excessive overcurrent area causes the first flexible electrical connector.
  • the three-dimensional size of 12 is too large to be deformed, and therefore, in order to smoothly deform the first flexible electrical connector 12, the first flexible electrical connector 12 is smaller in size in at least one dimension (for example, thickness) so that Perform bending deformation.
  • the first deformation portion generally includes at least one first bending portion 124.
  • the projection of the first bending portion 124 in one of the XY plane, the YZ plane, and the XZ plane is a bending structure according to a direction in which deformation is required. .
  • the first bent portion 124 can generate a shape variable along the X axis and the Y axis.
  • the projection in the YZ plane is a bent structure, and the shape variables along the Y-axis and the Z-axis can be generated.
  • the projection in the XZ plane is a bent structure, which can generate along the X-axis and the Z-axis. Shape variable. It should be noted that if the projection of the first bent portion 124 in the XY plane is a bent structure, in order to have a large overcurrent area, the first bent portion 124 needs to have a larger size in the Z-axis direction. This will take up a lot of space.
  • a first bending portion 124 can generally ensure that two dimensional deformation variables are generated.
  • the first deformation portion needs to be along The X-axis, the Y-axis, and the Z-axis generate a deformation amount, so if only one first bent portion 124 is used, either the first flexible electrical connector 12 has other deformation structures, or the first deformation portion can be simultaneously along the X The axis, the Y axis, and the Z axis produce a shape variable.
  • the first flexible electrical connector 12 also has other deformation structures
  • a twisting may generate a large tearing force, which may occur between the first electrode assembly connecting portion 120 and the first electrode assembly 10, or between the first connecting block connecting portion 122 and the first connecting block 14. Tearing, weakening the joint strength, or even completely disconnecting.
  • the twisting ability of the first flexible electrical connector 12 can be increased to some extent (see FIGS. 16 to 19), and the first can also be added. The deformability of the flexible electrical connector 12.
  • the first deformation portion can simultaneously generate a shape variable along the X axis, the Y axis, and the Z axis
  • the bent portion 124 is designed in the form of a wire or a strip so that the first bent portion 124 is also bent in the third dimension.
  • this design may cause the strength of the first flexible electrical connector 12 to decrease on the one hand, and on the other hand, the overcurrent area of the first flexible electrical connector 12 may be too small, the resistance is too high, and there is a risk of being blown. .
  • the first flexible electrical connector 12 is entirely in the form of a sheet, and the first deformation portion is provided with the first connecting portion 126 and the two first bent portions 124a, 124b.
  • the projections of the bent portions 124a, 124b in different planes respectively have a bent structure, and the plane in which the bent structures formed by the first bent portions 124a, 124b are projected and the first bent portions 124a, 124b themselves
  • the thickness directions are parallel, thereby achieving a shape variable in three dimensions.
  • the projection of the first bent portion 124a in the XZ plane is a bent structure, and the thickness direction of the first bent portion 124a changes with the shape of the first bent portion, but is always parallel to the XZ.
  • the plane, and the projection of the first bent portion 124b in the YZ plane is a bent structure, while the thickness direction of the first bent portion 124b is always parallel to the YZ direction.
  • the first bent portion 124a, 124b is connected to the first connecting portion 126 through one end, and the first electrode assembly connecting portion 120 is connected to one end of the first bent portion 124a away from the first connecting portion 126.
  • the first connecting block connecting portion 122 It is connected to one end of the first bent portion 124b away from the first connecting portion 126.
  • the first bent portion 124a can be deformed, and when the first connecting block 14 is displaced in the Y-axis direction, the first bent portion 124b can be deformed.
  • the first bent portions 124a, 124b can be simultaneously deformed.
  • the first flexible electrical connector 12 may be formed by using a single piece of sheet material, or may be formed by sequentially laminating a plurality of flexible connecting pieces.
  • the first flexible electrical connecting member 12 The total thickness is preferably maintained in the range of 0.1 to 1 mm, preferably in the range of 0.2 to 0.6 mm.
  • the flexible connecting pieces are fixedly connected to each other at least at both end positions, and the intermediate portions, particularly the portions at the first bent portion 124a, are independently movable to each other to improve the deformability of the first flexible electrical connecting member 12.
  • the first flexible electrical connector 12 in the embodiment does not participate in the sealed connection of the first electrode assembly 10 and the top cover sheet 30 because the shape of the first flexible electrical connector 12 The change does not affect the sealing performance of the top cover sheet 30.
  • the first electrode assembly 10 is directly integrated with the top cover sheet 30, for example, the first electrode assembly 10 is formed on the top cover sheet 30 by stamping or other processing. Since the first electrode assembly 10 and the top cover sheet 30 are integrated, the problems of sealing and electrical connection can be completely solved, and this manner can greatly simplify the assembly process and reduce the space occupied by the first electrode assembly 10. At this time, the first electrode assembly 10 only needs to be provided with the first pole 100 without other components.
  • the first electrode assembly 10 includes a first pole 100, a first pole seal 102, and a first electrical connector 104.
  • the first pole 100 passes through the top cover sheet 30 and passes through the first pole seal. 102 is sealingly connected to the top cover sheet 30.
  • the first pole 100 is electrically connected to the top cover sheet 30 through the first electrical connector 104 to positively charge the top cover sheet 30.
  • the first electrode assembly connecting portion 120 and the first portion The poles 100 are electrically connected.
  • the first electrical connector 104 may be located above the top cover sheet 30 or below the top cover sheet 30. Generally, the first electrical connector 104 and the top cover sheet 30 are in direct contact electrical connection.
  • the first electrical connector 104 is located below the top cover sheet 30 and between the bottom of the first pole 100 and the lower surface of the top cover sheet 30, thereby placing the first pole 100 The bottom is electrically connected to the lower surface of the top cover sheet 30.
  • the first connecting block 14 and the top cover sheet 30 may be insulated by a first upper insulating member 106 disposed between the first connecting block 14 and the top cover sheet 30 while leaving the first flexible electrical connecting member. 12 assembly space.
  • the first electrical connector 104 is located above the top cover sheet 30, more specifically between the top cover sheet 30 and the first connecting block 14, and the first pole 100 passes through at the same time.
  • the top cover sheet 30 and the first electrical connector 104 At this time, the first electrical connector 104 is in contact with and electrically connected to the side of the first pole 100, and the first electrode assembly connecting portion 120 and the top of the first pole 100 are electrically connected. connection.
  • the first electrical connector 104 may also be indirectly electrically connected to the first pole 100 through the first flexible electrical connector 12, the first connecting block 14, and the like. connection.
  • the first pole 100 is passed through the first electrical connector 104 but is not directly electrically connected thereto.
  • the first electrode assembly connecting portion 120 is in electrical contact with the first pole 100, first.
  • the connecting block connecting portion 122 is in electrical contact with the first connecting block 14
  • the first electrical connecting member 104 is simultaneously in contact with and electrically connected to the top cover sheet 30 and the first connecting block 14 , so that the first electrical connecting member 104 passes through the first connection.
  • the block 14 and the first flexible electrical connector 12 are in indirect electrical connection with the first pole 100.
  • the power battery forms a threading circuit through the top cover sheet 30 and the first electrode assembly 10. If the resistance in the nailing circuit is too small, the current in the nailing circuit is too large, and the nailing point is easy. Sparking, causing the battery to run out of control, so when wearing the nail, a large resistance is required in the nailing circuit. Therefore, the first electrical connector 104 in the second mode can be designed as a resistor having a large resistance (1 to 100,000 ⁇ ), thereby increasing the resistance in the circuit and reducing the current.
  • the first electrical connector 104 When the first electrical connector 104 is located below the top cover sheet 30, it is actually located inside the power battery, because the first electrical connector 104 can take the form of a resistor block in view of reducing the volume. When the first electrical connector 104 is located above the top cover sheet 30, conductive plastic can be used to protect the first flexible electrical connector 12 on the one hand and to buffer the movement of the first connecting block 14 on the other hand.
  • a first lower insulation may be provided between the bottom of the first pole 100 and the lower surface of the top cover sheet 30.
  • the piece 103 is insulated.
  • the first electrode assembly 10 and the top cover sheet 30 can be optimally designed in this embodiment, as shown in FIGS. 12 to 14. At this time, the first electrode assembly 10 includes the conductive sheet 101 and the first lower portion.
  • the insulating member 103, the first electrical connecting member 104 and the inverting sheet 105 are provided with a flipping plate connecting hole 300 on the top cover sheet 30, the flipping sheet 105 sealing the flipping sheet connecting hole 300, and the first lower insulating member 103 is located on the top cover sheet Below the 30, and connected to the top cover sheet 30, the conductive sheet 101 is insulated from the top cover sheet 30 by the first lower insulating member 103, and at the same time, the conductive sheet 30 is also electrically connected to the flip sheet 105.
  • the first electrical connector 104 is located above the top cover sheet 30 and covers the flip chip connection hole 300.
  • the first electrical connector 104 is electrically connected to the top cover sheet 30.
  • the first electrode assembly connecting portion 120 and the first electrical connector 104 are electrically connected. Electrical connection.
  • the power of the positive pole of the power battery is outputted by the conductive sheet 101, and then sent to the top cover sheet 30 via the flip sheet 105, and then transported to the first electrical connector 104 by the top cover sheet 30, and finally passed through the first flexible portion.
  • the electrical connector 12 is delivered to the first connection block 14.
  • the flipping sheet 105 can reverse and disconnect the electrical connection with the conductive sheet 101, thereby causing the interruption of the transport path of the positive electrode and releasing the overcharge state of the power battery.
  • the conductive sheet 101 is preferably provided with a weakened area. When the flipping sheet 105 is turned over, the weakened area may be broken due to stress concentration, thereby causing the flipping sheet to be turned over. 105 went up smoothly.
  • the first connecting block connecting portion 122 may be connected to the lower surface of the first connecting block 14, for example, between the first connecting block 14 and the first electrode assembly 10.
  • a first receiving cavity 11 is disposed in the first receiving cavity 11.
  • the volume and structure of the first flexible electrical connector 12 in the above structure need to be restricted by the first accommodating cavity 11, and thus may affect the magnitude of movement of the first connecting block 14.
  • the space of the first accommodating cavity 11 can be expanded by providing the relief portion 148 on the lower surface of the first connecting block 14 (see FIGS. 17, 19), but since the thickness of the first connecting block 14 itself is limited, the evasing portion The depth of 148 is not too large, and at most, it can only penetrate through the first connecting block 14, and the space expansion capability for the first receiving cavity 11 is limited.
  • the first connection block connecting portion 122 may be electrically connected to the upper surface of the first connection block 14, that is, the first flexible electrical connector.
  • a portion of the 12 can extend beyond the area between the first electrode assembly 10 and the first connecting block 14, so that the first flexible electrical connector 12 can have a larger size and a more complicated structure, thereby being able to accommodate the first connecting block. 14 more substantial movement.
  • a first connecting hole 140 may be disposed on the first connecting block 14 , first The connection block connecting portion 122 is electrically connected to the upper surface of the first connection block 14 after passing through the first connection hole 140. As shown in FIGS. 1 to 7, 12 to 13, 20 to 22, the first connection block connecting portion 122 may also be wound from the lower side of the first connection block 14 to the first connection block 14 via one side of the first connection block 14. The surface is electrically connected to the upper surface of the first connection block 14.
  • the first connecting block connecting portion 122 is directly wound from one side of the first connecting block 14 to the upper surface of the first connecting block 14, it may cause a portion of the first flexible electrical connector 12 to protrude outside the first connecting block 14 This part is easily damaged by external influences.
  • the structure of the first connecting block 14 can be optimized such that it forms a first recess that is recessed toward the inside on one side (in the figure) Unnumbered), the first flexible electrical connector 12 can be bypassed by the first gap 14 so as not to protrude beyond the first connecting block 14, thereby obtaining good protection.
  • the first gap and the first flexible electrical connector 12 are preferably conformal.
  • the upper surface of the first connecting block 14 is preferably kept flat. Therefore, the upper surface of the first connecting block 14 preferably has a first connecting groove 142, when the first When the connecting block connecting portion 122 is connected to the upper surface of the first connecting block 14, the first connecting block connecting portion 122 is electrically connected to the first connecting groove 142, so that the upper surface of the first connecting block connecting portion 122 does not exceed the first connection The upper surface of block 14.
  • the first connecting groove 142 and the first connecting block connecting portion 122 are conformal.
  • the second connection block 24 is located above the second electrode assembly 20 and also serves as a component connected to the bus bar.
  • the bus bar connected to the second connecting block 24 also adopts a straight plate structure, and when the power battery expands, the position between the second connecting block 24 and the bus bar is fixed. In order to prevent the second connecting block 24 from being displaced by the expansion of the power battery, the weakened area between the second connecting block 24 and the bus bar is broken.
  • the second flexible electrical connector 22 is utilized. The second electrode assembly 20 and the second connection block 24 are connected such that the relative position between the second connection block 24 and the second electrode assembly 20 can be changed so as not to affect the output of the power battery when it expands.
  • the second flexible electrical connector 22 is provided with a second electrode assembly connecting portion 220, a second connecting block connecting portion 222, and a second deformation portion (
  • the second electrode assembly 20 is electrically connected to the second electrode assembly connecting portion 220
  • the second connecting block 24 is electrically connected to the second connecting block connecting portion 222.
  • the second deformation portion has a flexible deformation ability and is deformable by an external force.
  • the bus bar is also simultaneously connected to the upper surfaces of the plurality of second connecting blocks 24, and when the power battery expands, the second The electrode assembly 20 is also displaced, and since the second connection block 24 is coupled to the bus bar, the second connection block 24 is stationary, which results in the connection between the second connection block 24 and the second electrode assembly 20. Relative displacement also occurs.
  • the second flexible electrical connector 22 In order to reduce the resistance, the second flexible electrical connector 22 generally needs to have a large overcurrent area, and the excessive overcurrent area may cause the three-dimensional size of the second flexible electrical connector 22 to be too large, which is disadvantageous for deformation. In order to smoothly deform the second flexible electrical connector 22, the second flexible electrical connector 22 is smaller in size in at least one dimension (e.g., thickness) for bending deformation.
  • the second flexible electrical connector 22 can also adopt a sheet-like structure, and the second deformation portion can also be provided with the second bending portion 224 and the second connecting portion 226, and the second bending portion
  • the number, arrangement, and function of the folded portions 224 can also be designed with reference to the first bent portion 124, for example, the second bent portion 224a and the second bent portion 224b.
  • the second flexible electrical connector 22 may be formed by using a single piece of sheet material, or may be formed by laminating a plurality of flexible connecting pieces in a thin manner, and details are not described herein.
  • the second flexible electrical connector 22 in this embodiment also does not participate in the sealed connection of the second electrode assembly 20 and the top cover sheet 30, the deformation of the second flexible electrical connector 22 does not affect the cover sheet 30. Sealing performance.
  • the second electrode assembly 20 includes a second pole 200, a second pole seal 202, and a second upper insulator 206.
  • the second pole 200 passes through the top cover sheet 30 and passes through the second pole.
  • the sealing member 202 is sealed and insulated from the top cover sheet 30.
  • the second upper insulating member 206 is located between the second connecting block 24 and the top cover sheet 30 to ensure electrical insulation between the second connecting block 24 and the top cover sheet 30.
  • the two electrode assembly connecting portion 220 is electrically connected to the second pole 200.
  • a second lower insulator 203 may be provided between the bottom of the second pole 200 and the lower surface of the cover sheet 30 for insulation.
  • the second connection block connection portion 222 of the second flexible electrical connector 22 can be coupled to the lower surface of the second connection block 24, such as at the second connection block 24 and the second electrode assembly 20.
  • a second receiving cavity 21 is defined between the second flexible electrical connectors 22 and placed in the second receiving cavity 21.
  • the second connecting block connecting portion 222 and the upper surface of the second connecting block 24 can also be electrically
  • a second connecting hole 240 is disposed on the second connecting block 24, and the second connecting block connecting portion 222 is electrically connected to the upper surface of the second connecting block 24 after passing through the second connecting hole 140.
  • the second connecting block connecting portion 222 is wound from the lower side of the second connecting block 24 to the upper surface of the second connecting block 24 via the side of the second connecting block 24, and is electrically connected to the upper surface of the second connecting block 24.
  • a second notch (not labeled) may be provided on the side of the second connecting block 24 in the same manner and function as the first notch on the first connecting block 14.
  • the upper surface of the second connecting block 24 is preferably kept flat, and the upper surface of the second connecting block 14 preferably also has a second connecting groove 242, and the second connecting block
  • the connecting portion 222 is electrically connected to the second connecting groove 242 such that the upper surface of the second connecting block connecting portion 222 does not exceed the upper surface of the second connecting block 24.
  • first connecting block 14 and the second connecting block 24 are flexibly connected by the first flexible electrical connector 12 and the second flexible electrical connector 22, so that the first connecting block 14 and the first connecting block 14 can be maintained while maintaining the electrical connection state.
  • the two connecting blocks 24 obtain a certain amount of displacement along the X-axis, the Y-axis, and the Z-axis, thereby better absorbing the force with the bus bar caused by the expansion and absorption of the battery.
  • the second embodiment of the present application performs structural improvement on the basis of the first embodiment.
  • the first connecting block 14 is provided with the moving capability, if the moving amount of the first connecting block 14 exceeds the deforming ability of the first flexible electrical connector 12, the first flexible electrical connector 12 has The breakage may occur, or the electrical connection with the first connection block 14 and the first electrode assembly 10 may be disengaged, and whatever happens, the first connection block 14 may no longer be in communication with the positive electrode of the power battery.
  • the second connection block 24 also has the possibility of this happening. Therefore, it is necessary to limit the specific movement range of the first connection block 14 and the second connection block 24 so that it can only be within a reasonable range. Move.
  • the power battery top cover structure provided in this embodiment further includes a first limiting member 16 and a second limiting member 26 in addition to the structure of the first embodiment.
  • the first connecting block 14 is provided with a first limiting engaging portion 144.
  • the first limiting engaging portion 144 can be coupled with the first limiting member 16 and the two can be mutually restrained after the connecting, so that the first limiting member The movement of the first limit fitting portion 144 can be restricted. Due to the first connection block
  • the connecting portion 122 is electrically connected to the first connecting block 14 and the two are moved together, and the first limiting engaging portion 144 is restricted, which means that the amount of movement of the first connecting block 14 is restricted.
  • the first limiting engagement portion 144 is a first limiting hole (for ease of understanding, hereinafter referred to by reference numeral 144), the first limiting member 16 includes a first limiting post 160 and a first limiting position.
  • the cap 162, the first limiting post 160 is fixedly disposed relative to the top cover sheet 30, for example, directly to the top cover sheet 30, or to the first electrical connector 104 or the first upper insulating member 106 of the first electrode assembly 10.
  • the first limit post 160 can accommodate the first electrode assembly 10 of various structures in the first embodiment, and is not limited to the first electrode assembly 10 including the conductive sheet 101 and the flip sheet 105.
  • the first limiting cap 162 is located on a side of the first connecting block 14 away from the top cover sheet 30.
  • the first limiting post 160 passes through the first limiting hole 144 along the Z axis and is riveted and welded to the first limiting cap 162.
  • the first limiting post 160 and the first limiting cap 162 can limit the movement of the first connecting block 14 in the Z-axis direction.
  • the first upper insulating member 106 is generally made of insulating plastic, the first limiting member 16 and the first upper insulating member 106 can be integrally formed to improve assembly efficiency, and the first limiting member 16 is insulated from the first upper portion.
  • the pieces 106 can be the same material or different materials.
  • the manner of limiting the movement of the first limiting hole 144 is mainly divided into two categories.
  • the first type is the movement of the first limiting hole 144 along the X axis and the Y axis, that is, the radial movement relative to the first limiting column 160.
  • the second type is the movement of the first limiting hole 144 in the Z direction, that is, the axial movement relative to the first limiting post 160.
  • the first limiting member 16 can completely restrict one of the movements of the first limiting hole 144 as needed (for example, the first limiting hole 144 is completely unable to move along the X axis, the Y axis, or can not be performed at all).
  • the diameter of the first limiting hole 144 needs to be larger than the diameter of the first limiting post 160, and a first ring may be formed between the first limiting hole 144 and the first limiting post 160.
  • the gap 164 due to the presence of the first annular gap 164, the first limiting hole 144 can move along the radial direction of the first limiting post 160, and the amplitude of the movement is equal to the first limiting hole 144 and the first limiting post The difference in radial dimension of 160, thereby achieving the purpose of limiting the amount of movement of the first stop hole 144 in the XY direction.
  • the size in the Z-axis direction can be adopted.
  • a limiting post 160 is coupled to the first limiting hole 144 having a smaller Z-axis direction, so that the first limiting hole 144 can move along the axial direction of the first limiting post 160, and at the same time, due to the first limit One end of the post 160 is fixed, and the other end fixes the first limiting cap 162, so the first connecting block 14 can not actually disengage from the first limiting post 160, but only the axis of the first limiting post 160 Move to the size range.
  • the first limiting cap 142 is located in the first limiting hole 144, and the blocking is disposed in the first limiting hole 144.
  • the portion 146 is configured to block the first limiting cap 142 from being separated from the first limiting hole 144 by the lower portion. Since the first limiting cap 142 is located in the first limiting hole 144, the upper surface of the first limiting cap 142 may not exceed the upper surface of the first connecting block 14.
  • the first connecting block 14 may not be restricted from rotating in the XY plane, and if the plurality of first limiting members 16 are simultaneously disposed, The first connecting block 14 is provided with a plurality of first limiting engaging portions 144.
  • the first limiting member 16 is coupled with the first limiting engaging portion 144 one by one, thereby solving the problem and making the first connecting block
  • the rotation of 14 in the XY plane is also limited.
  • the number of the first limiting member 16 and the first limiting portion 144 is even, for example two, symmetrically distributed on both sides of the first flexible electrical connector 12 along the X axis, if the first electrode assembly 10 and the first A first receiving cavity 11 is formed between the connecting blocks 14, and the first limiting member 16 can also be disposed directly relative to the first receiving cavity 11. Since the length direction of the top cover sheet 30 is along the X-axis direction, the space in the X-axis direction is relatively abundant, so that on the one hand, the first flexible electrical connector 12 can be avoided, and on the other hand, the first flexible electrical connector can also be used. 12 forms protection.
  • a first extension 128 may be disposed on the first flexible electrical connector 12, the first extension 128 being located between the first electrode assembly connection portion 120 and the first connection block connection portion 122, as shown in FIGS. 26 to 28, assembled
  • 16 is disposed on both sides of the first flexible electrical connector 12 along the X axis, so in order to avoid the first limiting member 16, at least a portion of the first flexible electrical connector 12 is along the Y axis.
  • the first accommodating cavity 11 is extended, and the first extending portion 128 is located outside the first accommodating cavity 11 and extends along the X axis to increase the heat dissipating area and improve the heat dissipating efficiency.
  • the first deforming portion has the first bent portion 124a projected in the XZ plane as a bent structure, at least one of the first bent portions 124a extends beyond the first receiving cavity 11, and this The first extension portion 128 is connected to the first bent portion 124a that extends beyond the first accommodation front 11.
  • This design can not only increase the heat dissipation area by the first extension portion 128, but also increase the strength of the bent portion.
  • the first connecting block connecting portion 122 is further provided with a first connecting block auxiliary connecting portion 122a while being connected at the first electrode assembly.
  • the portion 120 further includes a first electrode assembly auxiliary connecting portion 120a.
  • the first connecting block auxiliary connecting portion 122a can extend all the way to the side of the first extending portion 128 to increase the contact area of the first connecting block connecting portion 122 with the first connecting block 14, and similarly, the first electrode assembly auxiliary connection
  • the portion 120a also extends to the side of the first extension portion 128 for increasing the contact area of the first electrode assembly connecting portion 120 with the first electrode assembly 10. When the contact area is increased, the overcurrent capability can be enhanced.
  • the first indentation on the side of the first connection block 14 can accommodate the first bend 124 and the first extension 128 together.
  • the second limiting member 26 is similar in structure and function to the first limiting member 16 , and may include a second limiting post 260 and a second limiting cap 262 . And the second limit block fitting portion 244 (for example, the second limit hole) disposed on the second connecting block 24 is engaged to limit the displacement amplitude of the second connecting block 24.
  • the second limiting member 26 may be fixed to the top cover sheet 30 like the first limiting member 16, or may be fixed to the second upper insulating member 206 of the second electrode assembly 20 of various configurations in the first embodiment. At the same time, the second electrode assembly 20 may also be integrally formed with the second upper insulator 206.
  • the second flexible electrical connector 22 in this embodiment may further include a second extension portion 228 for dissipating heat, and the second electrode assembly auxiliary connection portion 220a and the second connection block auxiliary connection portion 222a are second.
  • the overall overcurrent capability of the flexible electrical connector 22 is the same as that of the first flexible electrical connector 12, and will not be described herein.
  • the third embodiment of the present application performs structural improvement on the basis of the second embodiment.
  • the first connecting block 14 and the second connecting block 24 are both displaceable relative to the cover sheet 30, but the first connecting block 14 and the second connecting block 24 are connected to the bus bar.
  • the connection is made, if both the first connection block 14 and the second connection block 24 are free to move, assembly will be troublesome.
  • the power battery top cover structure provided in this embodiment further includes a first elastic member 18 and a second elastic member 28 in addition to the structure of the second embodiment.
  • the first elastic member 18 and the second elastic member 28 function to elastically deform when the first connecting block 14 and the second connecting block 24 move relative to the top cover sheet 30, and rebound after the external force is removed, and While rebounding, the first connecting block 14 and the second connecting block 24 are pushed back to the position before the movement, thereby ensuring that the first connecting block 14 and the second connecting block 24 can have a substantially fixed position for assembly.
  • the first elastic member 18 includes a first radial elastic member 180 and a first axial elastic member 182.
  • the first radial elastic member 180 is embedded in the first annular gap 164, and can be in the first A connecting block 14 is crushed and deformed when moved along the X-axis or the Y-axis by an external force.
  • the first radial elastic member 180 may be blocked by the blocking portion 146 in the embodiment, that is, at the time of assembly, the first The radial elastic member 180 is disposed between the blocking portion 146 and the first limit cap 162. At this time, it is preferable to ensure that the upper surface of the first limiting cap 142 does not exceed the upper surface of the first connecting block 14.
  • the structure of the blocking portion 146 may take the form of a limiting block, preferably an annular baffle.
  • the first axial elastic member 182 is disposed below the first connecting block 14, for example, between the first connecting block 14 and the top cover sheet 30, or at the first connecting block 14 and the first electrode. Between components 10. When the first connecting block 14 moves downward in the Z-axis direction by an external force, the first axial elastic member 182 can be compressed, and after the external force is removed, the first connecting block 14 can be lifted by the first axial elastic member 182 Jack up until it is restrained by the first limit cap 162. At this time, the first connecting block 14 is restrained by the first limiting cap 162 and the first axial elastic member 182 from opposite directions.
  • the first axial elastic member 182 may be disposed at any position below the first connecting block 14, only It is to be noted that other components can be avoided. However, in view of space saving and ease of assembly, it is preferable to sleeve the first axial elastic member 182 on the first limit post 160. Moreover, a first recess portion (not labeled) may be disposed on the top cover sheet 30, the first electrical connector 104 or the first upper insulator 106, and the bottom of the first limiting post 160 is fixed to the first recess. a second annular gap 166 is formed between the first recess and the first recessed portion 166 to reduce the occupation of the first axial elastic member 182 in the Z-axis direction. The space simultaneously causes the upper surface of the first axial elastic member 182 to extend beyond the first recess to contact the first connecting block 14 and provide a force.
  • the first limiting post 160 may include a lower fitting section 160a and an upper fitting section 160b.
  • the diameter of the lower fitting section 160a is larger than the diameter of the upper fitting section 160b, and the first axial elastic component 182 sets are disposed on the lower mating section 160a, and the first radial elastic member 180 is sleeved on the upper mating section 160b.
  • the thicker lower fitting section 160a can increase the structural strength and the joint strength of the first limiting post 160, and the movement of the first limiting block 14 along the X-axis and the Y-axis is mainly restricted by the upper fitting section 160b, and therefore, is smaller.
  • the upper mating segment 160b is advantageous for increasing the magnitude of movement of the first connecting block 14.
  • the first radial elastic member 180 and the first axial elastic member 182 may take various forms, for example, a spring extending around the first limiting post 160 along the radial direction of the first limiting post 160 serves as the first radial direction.
  • the elastic member 180 is provided with a spring extending in the axial direction of the first limiting member 160 to serve as the first axial elastic member 182.
  • the assembly of this method is difficult and the reliability is poor. Therefore, in the present embodiment, the first radial elastic member 180 and the first axial elastic member 182 are preferably formed of an annular structure made of an elastic material.
  • the structure and function of the second elastic member 28 in this embodiment are similar to those of the first elastic member 18, and may include a second radial elastic member 280 and a second axial elastic member 282, according to the second limit.
  • the position of the position post 260 may be disposed on the top cover sheet 30 or the second upper insulating member 206.
  • the bottom of the second limiting post 260 is fixed in the second recessed portion, and the second axial elastic member 282 is fixed. Inserting between the second recessed portion and the second limiting post 260 to reduce the space occupied by the second axial elastic member 282 in the Z-axis direction while the upper surface of the second axial elastic member 282 is beyond the second recessed portion To contact the second connecting block 24 and provide a force.
  • the second limit column 260 can also adopt a two-stage structure similar to the first limit column 160 to achieve the same technical effect, and details are not described herein again.
  • the power battery top cover structure provided by the embodiment of the present application can make the first connecting block and the first The two connecting blocks are relatively displaced to absorb the force between the bus bar and the displacement of the first connecting block and the second connecting block, and can enable the first connecting block and the second connecting block in a natural state. Go back to the initial position.

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

L'invention concerne une structure de couvercle supérieur de batterie d'alimentation, une batterie d'alimentation et un module de batterie, se rapportant au domaine des dispositifs de stockage d'énergie. La structure de couvercle supérieur de batterie d'alimentation comprend une pièce de couvercle supérieur (30), un premier ensemble d'électrodes (10), un second ensemble d'électrodes (20), une première pièce de connexion électrique flexible (12), un premier bloc de connexion (14) et une première pièce de limitation (16). Le premier bloc de connexion (14) est électriquement connecté au premier ensemble d'électrodes (10) par l'intermédiaire de la première pièce de connexion électrique flexible (12), le premier bloc de connexion (14) peut subir un déplacement par rapport au premier ensemble d'électrodes (10), une première partie d'adaptation de limitation (144) est disposée sur le premier bloc de liaison (14), et la première partie d'adaptation de limitation (144) est mise en correspondance avec la première pièce de limitation (16) et reliée à celle-ci. La batterie d'alimentation comprend la structure de couvercle supérieur de batterie d'alimentation. Le module de batterie comprend un bus et une pluralité de batteries d'alimentation, la pluralité des premiers blocs de connexion (14) étant électriquement connectés par l'intermédiaire du bus. La structure de couvercle supérieur de batterie d'alimentation permet au premier bloc de connexion (14) de subir un déplacement par rapport au premier ensemble d'électrodes (10) sous l'effet d'une force externe.
PCT/CN2017/070418 2017-01-06 2017-01-06 Structure de couvercle supérieur de batterie d'alimentation, batterie d'alimentation et module de batterie WO2018126438A1 (fr)

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PCT/CN2017/070418 WO2018126438A1 (fr) 2017-01-06 2017-01-06 Structure de couvercle supérieur de batterie d'alimentation, batterie d'alimentation et module de batterie
CN201780070006.8A CN109964336B (zh) 2017-01-06 2017-01-06 动力电池顶盖结构、动力电池及电池模组

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