Composite busbar and battery pack

Abstract

The utility model discloses a kind of composite wiring row and battery pack, it is related to battery technical field.The composite wiring row includes rigid connection row and flexible connection row, the rigid connection row includes two first connecting plates connected;The flexible connection row includes flexible connecting portion and two second connecting plates, the hardness of the flexible connecting portion is less than the hardness of the rigid connection row, two the second connecting plate is connected with the flexible connecting portion, one the second connecting plate is connected with one the first connecting plate, another the second connecting plate is connected with another the first connecting plate.The composite wiring row improves the overcurrent capacity, can be applied to the battery pack of high-power output, and can be through slight deformation and absorb the displacement after compensating battery swelling, avoid security risk.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and in particular to a composite terminal block and battery pack. Background Technology

[0002] With the rapid development of new energy vehicles, users have increasingly higher performance requirements, and correspondingly, the power of new energy vehicles is also becoming stronger to improve their market competitiveness. To achieve this increased power, the power battery pack needs to be able to output electricity at high power.

[0003] However, the terminal blocks connecting the cells in the power battery pack are rigid. In order for the terminal blocks to deform slightly to absorb and compensate for the displacement after the expansion of the cells, the thickness of the terminal blocks is small, making it difficult to output high power. If the thickness of the terminal blocks is increased, the terminal blocks will not be able to absorb and compensate for the displacement after the expansion of the cells, resulting in desoldering or damage to the terminals of the cells, which poses a safety hazard. Utility Model Content

[0004] The purpose of this invention is to propose a composite terminal block and battery pack, which improves the overcurrent capacity, is applicable to high-power output battery packs, and can absorb and compensate for the displacement after the expansion of the battery cells through slight deformation, thus avoiding safety hazards.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] A composite terminal block, comprising:

[0007] A rigid connecting bar, the rigid connecting bar comprising two connected first connecting plates;

[0008] A flexible connecting strip includes a flexible connecting part and two second connecting plates. The hardness of the flexible connecting part is less than that of the rigid connecting strip. Both second connecting plates are connected to the flexible connecting part. One second connecting plate is connected to one first connecting plate, and the other second connecting plate is connected to the other first connecting plate.

[0009] As an alternative to the aforementioned composite terminal block, the rigid terminal block is configured as a terminal connecting two battery cells, and the flexible terminal block is located on the side of the rigid terminal block away from the battery cells.

[0010] As an alternative to the above-mentioned composite terminal block, the rigid connection block further includes an arch bridge, which is located between and connected to the two first connection plates, and the flexible connection portion overlaps the top surface of the arch bridge.

[0011] As an alternative to the above-mentioned composite terminal block, the flexible connection block includes a plurality of connecting pieces stacked sequentially, one end of the plurality of connecting pieces being fixedly connected to form a second connecting plate, the other end of the plurality of connecting pieces being fixedly connected to form another second connecting plate, and the middle portions of the plurality of connecting pieces being stacked sequentially to form the flexible connection portion.

[0012] As an optional solution for the aforementioned composite terminal block, the multiple layers of connecting pieces are fixedly connected by heat pressing; and / or,

[0013] The connecting piece is fixedly connected to the first connecting plate by heat pressing.

[0014] As an optional solution for the above-mentioned composite terminal block, the first connecting plate has a first through hole, the second connecting plate has a second through hole, the diameter of the second through hole is larger than the diameter of the first through hole, and the terminal of the battery cell passes through the first through hole and is connected to the first connecting plate in the second through hole.

[0015] As an alternative to the above-mentioned composite terminal block, the diameter of the second through hole gradually decreases along the direction close to the first connecting plate.

[0016] As an alternative to the above-mentioned composite terminal block, the rigid terminal block is made of the same material as the flexible terminal block.

[0017] As an alternative to the above-mentioned composite terminal block, along the thickness direction of the composite terminal block, the orthographic projection of the second connecting plate onto the rigid connecting block is located within the first connecting plate.

[0018] A battery pack, characterized in that it includes the aforementioned composite terminal block, and further includes a plurality of battery cells, wherein the plurality of battery cells are connected in series and / or in parallel through the plurality of the composite terminal block.

[0019] The beneficial effects of this utility model are:

[0020] This invention provides a composite terminal block and battery pack. The composite terminal block consists of a rigid connecting strip and a flexible connecting strip. The rigid connecting strip connects the terminals of the battery cells, while the flexible connecting strip connects to the first connecting plate of the rigid connecting strip via a second connecting plate. This significantly improves the current-carrying capacity of the composite terminal block, while still allowing for slight deformation to absorb and compensate for displacement caused by cell expansion. Therefore, the composite terminal block is suitable for high-power output battery packs. Furthermore, the flexible connecting strip can be directly connected to existing rigid connecting strips, eliminating the need to adjust existing welding equipment and parameters, thus reducing costs.

[0021] This composite terminal block improves overcurrent capacity, making it suitable for high-power battery packs. It can also absorb and compensate for cell displacement after expansion through slight deformation, thus avoiding safety hazards. Attached Figure Description

[0022] Figure 1 This is an exploded view of a composite terminal block provided in one embodiment of this utility model;

[0023] Figure 2 This is a cross-sectional view of a composite terminal block provided in one embodiment of this utility model.

[0024] In the picture:

[0025] 1. Rigid connecting strip; 11. First connecting plate; 12. Arch bridge; 13. First through hole;

[0026] 2. Flexible connecting strip; 21. Second connecting plate; 22. Flexible connecting part; 23. Second through hole. Detailed Implementation

[0027] The embodiments of this utility model are described in detail below. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote 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 and intended to explain this utility model, and should not be construed as limiting this utility model.

[0028] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "first position" and "second position" refer to two different positions.

[0029] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, they can refer to fixed connections or detachable connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and connections within two components or interactions between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0030] Unless otherwise expressly specified and limited, "above" or "below" a second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of a second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" of a second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0031] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0032] This embodiment provides a battery pack, which includes multiple battery cells. Each battery cell includes a body and a positive terminal and a negative terminal disposed on the body. The multiple battery cells are connected in series or in parallel so that the battery pack can supply power to a new energy vehicle with a preset current and voltage.

[0033] It is worth noting that, for safety reasons, multiple battery cells are connected in series and / or parallel via multiple terminal blocks. These terminal blocks have a large cross-sectional area, preventing overheating even when carrying large currents, thus ensuring safety and reducing the risk of thermal runaway. Furthermore, the flat shape of the terminal blocks provides a larger surface area, reducing the skin effect.

[0034] With the rapid development of new energy vehicles, users have increasingly higher performance requirements, leading to more powerful vehicles to enhance their market competitiveness. Higher power output means that the terminal blocks need to carry greater current, necessitating larger cross-sectional areas to ensure safety.

[0035] However, the terminal blocks connecting the cells in the power battery pack are rigid. If the thickness of the terminal blocks is increased, the terminal blocks cannot absorb and compensate for the displacement after the cells expand, which may lead to desoldering or damage to the cell terminals, posing a safety hazard.

[0036] This embodiment also provides a composite terminal block, which is used to connect the terminals of two battery cells with the same electrical polarity to connect the two battery cells in parallel, or to connect the terminals of two battery cells with opposite electrical polarities to connect the two battery cells in series. Figure 1 and Figure 2As shown, the composite terminal block includes a rigid connection block 1 and a flexible connection block 2. The rigid connection block 1 includes two connected first connection plates 11. The flexible connection block 2 includes a flexible connection part 22 and two second connection plates 21. The rigidity of the flexible connection part 22 is less than that of the rigid connection block 1. Both second connection plates 21 are connected to the flexible connection part 22. One second connection plate 21 is connected to one first connection plate 11, and the other second connection plate 21 is connected to the other first connection plate 11.

[0037] The composite terminal block consists of a rigid connecting block 1 and a flexible connecting block 2. The rigid connecting block 1 is used to connect the terminals of the battery cells, while the flexible connecting block 2 is connected to the first connecting plate 11 of the rigid connecting block 1 through a second connecting plate 21. This is equivalent to increasing the cross-sectional area on the basis of the existing rigid connecting block 1, thereby significantly improving the current carrying capacity of the composite terminal block. It can still slightly deform to absorb and compensate for the displacement after the expansion of the battery cells, so that the composite terminal block can be used for high-power output battery packs.

[0038] This composite terminal block improves overcurrent capacity, making it suitable for high-power battery packs. It can also absorb and compensate for cell displacement after expansion through slight deformation, thus avoiding safety hazards.

[0039] It is worth noting that the rigid connector 1 and the flexible connector 2 are made of the same material, meaning they have the same electrical conductivity. This prevents the formation of electrochemical couples and avoids electrochemical corrosion that could affect electrical performance. Both the rigid connector 1 and the flexible connector 2 are made of copper or aluminum.

[0040] In this embodiment, the rigid connector 1 is configured to connect the terminals of two battery cells, and the flexible connector 2 is located on the side of the rigid connector 1 facing away from the battery cells. This structure allows the composite connector to be connected to the terminals of the battery cells through the rigid connector 1, ensuring connection strength, and eliminating the need to adjust existing welding equipment and welding parameters, thus reducing costs.

[0041] like Figure 1 and Figure 2 As shown, in order to improve the ability of the rigid connecting bus 1 to withstand slight deformation, the rigid connecting bus 1 also includes an arch bridge 12. The arch bridge 12 is located between and connected to the two first connecting plates 11. When the terminal of the battery cell moves due to the bulging of the battery cell, it will pull the arch bridge 12 through the first connecting plates 11, so that the rigid connecting bus 1 can compensate for the displacement of the battery cell after expansion by changing the height of the arch bridge 12.

[0042] To improve the stability of the flexible connecting strip 2, the flexible connecting part 22 overlaps the top surface of the arch bridge 12. That is, when the two second connecting plates 21 of the flexible connecting strip 2 are fixed to the corresponding first connecting plates 11, the flexible connecting part 22 is straightened as much as possible so that the flexible connecting part 22 is supported by the arch bridge 12.

[0043] In this embodiment, the flexible connecting strip 2 includes a plurality of connecting pieces stacked sequentially. One end of the plurality of connecting pieces is fixedly connected to form a second connecting plate 21, and the other end of the plurality of connecting pieces is fixedly connected to form another second connecting plate 21. The middle portions of the plurality of connecting pieces are stacked sequentially to form a flexible connecting portion 22.

[0044] This structure can significantly improve the flexibility of the flexible connector 2, ensuring that the flexible connector 2 has sufficient deformation capacity while being made of the same material as the rigid connector 1 and having sufficient thickness, thus ensuring the normal use of the composite connector in high-power battery packs.

[0045] In this embodiment, the multilayer connecting pieces are fixedly connected by hot pressing. Hot pressing breaks down the oxide film on the metal surface, allowing adjacent connecting pieces to make direct contact, reducing contact resistance, and resulting in higher connection strength and improved reliability.

[0046] Similarly, the connecting piece and the first connecting plate 11 are fixedly connected by hot pressing, so that when connecting the flexible connecting strip 2 and the rigid connecting strip 1, one end of the multi-layer connecting piece can be placed on the first connecting plate 11, and the multi-layer connecting piece and the first connecting plate 11 can be fixed together by hot pressing. The other end of the multi-layer connecting piece and another first connecting plate 11 can be fixed in the same way.

[0047] Multiple connecting pieces are thermo-pressed together with rigid connecting strip 1, which serves as a substrate. Both ends of one connecting piece are fixed to rigid connecting strip 1, and the two ends of another connecting piece are fixed to the ends of the previous connecting piece, and so on, thus fixing multiple connecting pieces together to form a complete composite connecting strip. The thickness of this composite connecting strip is the sum of the thickness of rigid connecting strip 1 and the thickness of the multiple connecting pieces, denoted as H. This structure allows the composite connecting strip to carry the same current as a conventional connecting strip with a thickness of H, making it suitable for battery packs with higher power output. Furthermore, the composite connecting strip has the ability to deform slightly, similar to thinner connecting pieces with the same thickness as rigid connecting strip 1, thereby absorbing and compensating for displacement after cell expansion.

[0048] In other words, this composite connector can carry a large current while still having the ability to absorb and compensate for the displacement caused by the expansion of the battery cell by slight deformation. At the same time, it can be welded to the electrode post with existing welding equipment and welding parameters, which reduces costs.

[0049] Preferably, along the thickness direction of the composite terminal block, the projection of the second connecting plate 21 onto the rigid connecting plate 1 is located within the first connecting plate 11. This structure ensures that the second connecting plate 21 and the first connecting plate 11 have a sufficiently large contact area, and the first connecting plate 11 has high rigidity, which also ensures the overall stability of the composite terminal block and avoids the risk of the flexible connecting plate 2 extending beyond the contour of the rigid connecting plate 1 and coming into contact with other structures.

[0050] like Figure 1 and Figure 2 As shown, to facilitate welding and fixing the composite terminal block and the battery cell's terminal post, the first connecting plate 11 has a first through hole 13, and the second connecting plate 21 has a second through hole 23. The diameter of the second through hole 23 is larger than that of the first through hole 13. The battery cell's terminal post passes through the first through hole 13 and connects to the first connecting plate 11 within the second through hole 23. Since the first connecting plate 11 is rigid, welding the terminal post to the first connecting plate 11 provides the best fixing effect. Furthermore, having the terminal post pass through the first through hole 13 and connect to the first connecting plate 11 within the second through hole 23 increases the connection area between the terminal post and the first connecting plate 11, thereby improving the connection strength. This also reduces the difficulty of operation for the operator and improves welding efficiency.

[0051] Preferably, the diameter of the second through hole 23 gradually decreases along the direction close to the first connecting plate 11. That is, the second through hole 23 is open, which facilitates the welding of the pole post to the first connecting plate 11 by operators or welding equipment. Specifically, all layers of connecting pieces are provided with openings, and the diameter of the openings in each layer of connecting pieces gradually increases along the direction away from the first connecting plate 11.

[0052] The above description is only a preferred embodiment of this utility model. For those skilled in the art, there will be changes in the specific implementation method and application scope based on the idea of ​​this utility model. The content of this specification should not be construed as a limitation of this utility model.

Claims

1. A composite terminal block, characterized in that, include: A rigid connecting bar (1), the rigid connecting bar (1) comprising two first connecting plates (11) connected to each other; The flexible connecting strip (2) includes a flexible connecting part (22) and two second connecting plates (21). The hardness of the flexible connecting part (22) is less than that of the rigid connecting strip (1). Both second connecting plates (21) are connected to the flexible connecting part (22). One second connecting plate (21) is connected to one first connecting plate (11), and the other second connecting plate (21) is connected to the other first connecting plate (11).

2. The composite terminal block according to claim 1, characterized in that, The rigid connecting bar (1) is configured as a terminal post connecting two battery cells, and the flexible connecting bar (2) is located on the side of the rigid connecting bar (1) away from the battery cells.

3. The composite terminal block according to claim 1, characterized in that, The rigid connecting bar (1) also includes an arch bridge (12), which is located between and connected to the two first connecting plates (11), and the flexible connecting part (22) overlaps the top surface of the arch bridge (12).

4. The composite terminal block according to claim 1, characterized in that, The flexible connecting strip (2) includes a plurality of connecting pieces stacked in sequence. One end of the plurality of connecting pieces is fixedly connected to form a second connecting plate (21), and the other end of the plurality of connecting pieces is fixedly connected to form another second connecting plate (21). The middle portions of the plurality of connecting pieces are stacked in sequence to form the flexible connecting part (22).

5. The composite terminal block according to claim 4, characterized in that, The multiple connecting pieces are fixedly connected by heat pressing; and / or, The connecting piece is fixedly connected to the first connecting plate (11) by hot pressing.

6. The composite terminal block according to claim 1, characterized in that, The first connecting plate (11) has a first through hole (13), and the second connecting plate (21) has a second through hole (23). The diameter of the second through hole (23) is larger than that of the first through hole (13). The electrode of the battery cell passes through the first through hole (13) and is connected to the first connecting plate (11) in the second through hole (23).

7. The composite terminal block according to claim 6, characterized in that, Along the direction close to the first connecting plate (11), the diameter of the second through hole (23) gradually decreases.

8. The composite terminal block according to claim 1, characterized in that, The rigid connecting bar (1) is made of the same material as the flexible connecting bar (2).

9. The composite terminal block according to claim 1, characterized in that, Along the thickness direction of the composite terminal block, the second connecting plate (21) is located within the first connecting plate (11) in the orthographic projection of the rigid connecting plate (1).

10. A battery pack, characterized in that, The device includes multiple composite terminal blocks as described in any one of claims 1 to 9, and also includes multiple battery cells, wherein the multiple battery cells are connected in series and / or in parallel through the multiple composite terminal blocks.

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