Electrical connection structure, cell assembly and battery pack

Abstract

This invention provides an electrical connection structure, a battery cell assembly, and a battery pack. The electrical connection structure includes: a substrate with a first side and a second side disposed opposite to each other along its height; the first side having two spaced-apart connection areas along its length; and a protruding member connected to the area on the first side excluding the connection areas. The protruding member extends along its height in a direction away from the second side to increase the current-carrying capacity of the electrical connection structure. The protruding member includes multiple spaced-apart protrusions to increase the heat dissipation area of ​​the electrical connection structure. This invention solves the problem in existing electrical connection structures where insufficient current and severe heat generation in super-fast charging or space-constrained scenarios affect the normal operation of the battery cell.

Description

Technical Field

[0001] This utility model relates to the field of battery technology, and more specifically, to an electrical connection structure, a cell assembly, and a battery pack. Background Technology

[0002] In existing technologies, electrical connectors are generally formed by bending aluminum or copper plates. Although they can achieve electrical connection between two battery cells, in super-fast charging or in scenarios with limited space, the aforementioned electrical connectors will experience problems such as insufficient overcurrent and severe overheating. Furthermore, the heat generated by the electrical connectors will be transferred to the inside of the battery cells through the tabs, which will affect the normal operation of the battery cells. Utility Model Content

[0003] The main objective of this invention is to provide an electrical connection structure, a cell assembly, and a battery pack to solve the problem that the electrical connection structure in the prior art suffers from insufficient overcurrent and severe heat generation in super-fast charging or space-constrained scenarios, which affects the normal operation of the cell.

[0004] To achieve the above objectives, this utility model provides an electrical connection structure, comprising: a substrate, having a first side and a second side disposed opposite to each other along the height direction of the substrate, and having two connection areas disposed at intervals along the length direction of the substrate; and a protruding member, connected to the area on the first side other than the connection areas, the protruding member extending along the height direction in a direction away from the second side to increase the current carrying capacity of the electrical connection structure, the protruding member including a plurality of protrusions disposed at intervals to increase the heat dissipation area of ​​the electrical connection structure.

[0005] Furthermore, multiple protrusions are spaced apart along the width direction of the substrate.

[0006] Furthermore, the plurality of protrusions are first protrusions and second protrusions, with at least two first protrusions and two second protrusions. The first protrusions and the connecting area are both located between the two second protrusions. Along the length direction, the second protrusions extend from one end of the substrate to the other end of the substrate.

[0007] Furthermore, the height h2 of the second protrusion is greater than or equal to the height h1 of the first protrusion.

[0008] Furthermore, multiple protrusions are spaced apart along the length of the substrate.

[0009] Furthermore, the substrate includes a first flat plate, an arched plate, and a second flat plate connected in sequence, with two connecting regions located on the first flat plate and the second flat plate, respectively.

[0010] Furthermore, a recessed portion is provided on the connecting area, and the recessed portion is recessed into the substrate from the direction of the first side to the second side.

[0011] Furthermore, the protruding member is provided with two clearance grooves, which pass through the protruding member along the height direction. The two clearance grooves are respectively connected to two recesses. The projected area of ​​the clearance grooves on the first side is greater than the projected area of ​​the recesses on the first side; and / or, the bottom wall of the recess is provided with a viewing hole.

[0012] According to another aspect of the present invention, the present invention provides a battery cell assembly, including multiple battery cells and the above-mentioned electrical connection structure, wherein the multiple battery cells are arranged in sequence, and the tabs of two adjacent battery cells are electrically connected through the electrical connection structure.

[0013] According to another aspect of the present invention, the present invention provides a battery pack, including a battery box and the above-mentioned cell assembly, wherein the cell assembly is installed inside the battery box.

[0014] By applying the technical solution of this utility model, two spaced-apart connection areas are used to connect two battery cells. By providing a protruding member extending away from the second side in the non-connection area on the first side, the cross-sectional area of ​​the electrical connection structure is increased, thereby increasing its current-carrying area and enhancing its current-carrying capacity. Furthermore, the protruding member includes multiple spaced-apart protrusions, increasing the heat dissipation area of ​​the electrical connection structure and reducing the risk of battery cell performance degradation due to heat generation. Therefore, this technical solution not only improves the current-carrying capacity of the electrical connection structure but also optimizes heat dissipation performance, ensuring the normal operation of the battery cells, making it particularly suitable for applications requiring fast charging and space constraints. Attached Figure Description

[0015] The accompanying drawings, which form part of this application, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an undue limitation of the present invention. In the drawings:

[0016] Figure 1 A schematic diagram of an embodiment of the battery cell assembly of this utility model is shown;

[0017] Figure 2 It shows Figure 1 A partial enlarged view of the battery cell assembly;

[0018] Figure 3 It shows Figure 1 A schematic diagram of an embodiment of the electrical connection structure of a battery cell assembly;

[0019] Figure 4 A side view of the electrical connection structure of 3 is shown;

[0020] Figure 5 It shows Figure 1 A schematic diagram of another embodiment of the electrical connection structure of the battery cell assembly.

[0021] The above figures include the following reference numerals:

[0022] 1. Electrical connection structure; 2. Battery cell; 10. Substrate; 11. First side surface; 12. Second side surface; 13. First flat plate; 14. Arched plate; 15. Second flat plate; 16. Recess; 161. Viewing hole; 20. Protruding member; 21. First protrusion; 211. Positioning hole; 212. Electrode; 22. Second protrusion; 23. Clearance groove. Detailed Implementation

[0023] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0024] like Figures 1 to 5 As shown, an embodiment of the present invention provides an electrical connection structure, including: a base 10, having a first side 11 and a second side 12 disposed opposite to each other along the height direction Z of the base 10, and having two connection areas disposed at intervals along the length direction X of the base 10; and a protruding member 20, connected to the area on the first side 11 other than the connection areas, the protruding member 20 extending in the height direction Z toward the direction away from the second side 12 to increase the current carrying capacity of the electrical connection structure, the protruding member 20 including a plurality of protrusions disposed at intervals to increase the heat dissipation area of ​​the electrical connection structure.

[0025] In the above technical solution, two spaced-apart connection areas are used to connect two battery cells 2. By providing a protruding member 20 extending away from the second side 12 in the non-connection area of ​​the first side 11, the cross-sectional area of ​​the electrical connection structure 1 is increased, thereby increasing its current-carrying area and enhancing its current-carrying capacity. In addition, the protruding member 20 includes multiple spaced-apart protrusions, increasing the heat dissipation area of ​​the electrical connection structure 1 and reducing the risk of performance degradation of the battery cell 2 due to heat generation. Therefore, this technical solution not only improves the current-carrying capacity of the electrical connection structure but also optimizes heat dissipation performance, ensuring the normal operation of the battery cell 2, and is particularly suitable for applications requiring fast charging and space constraints.

[0026] Furthermore, by setting multiple protrusions, not only can the heat dissipation area be increased, but the current carrying capacity per unit cross-sectional area can also be improved.

[0027] In some embodiments, the electrical connection structure is an electrical connection bus.

[0028] like Figures 1 to 4 As shown, in some embodiments, multiple protrusions are spaced apart along the width direction Y of the substrate 10.

[0029] In the above technical solution, by distributing protrusions at intervals along the width direction Y, not only is the current-carrying area increased, thereby improving the current transmission capability, but the heat dissipation area is also effectively increased, accelerating the dissipation of heat and reducing its temperature.

[0030] like Figures 1 to 4 As shown, in some embodiments, the multiple protrusions are first protrusions 21 and second protrusions 22. There are at least two first protrusions 21 and two second protrusions 22. The first protrusions 21 and the connecting area are both located between the two second protrusions 22. Along the length direction X, the second protrusions 22 extend from one end of the base 10 to the other end of the base 10.

[0031] In the above technical solution, the second protrusion 22 is not cut by the recess 16 and the relief groove 23, but extends from one end of the base 10 to the other end of the base 10, which can achieve full coverage. This not only increases the mechanical strength of the electrical connection structure, but also provides better current conduction.

[0032] like Figures 1 to 4 As shown, in some embodiments, the height h2 of the second protrusion 22 is greater than or equal to the height h1 of the first protrusion 21. This effectively provides flow capacity.

[0033] like Figure 5 As shown, in some embodiments, multiple protrusions are spaced apart along the length direction X of the base 10.

[0034] In the above technical solution, by distributing protrusions at intervals along the length direction X, not only is the current-carrying area increased, thereby improving the current transmission capability, but the heat dissipation area is also effectively increased, accelerating the dissipation of heat and reducing its temperature.

[0035] It should be noted that, Figure 5 Implementation examples and Figure 4 The embodiments differ in orientation; similarly, these protrusions can serve a heat dissipation function, helping to improve the current-carrying capacity of the electrical connection structure; and Figure 4 and Figure 5 All embodiments can meet large current requirements in a small space. They can achieve greater current capacity by increasing the height of multiple protrusions, achieving more than twice the current capacity of existing solutions, and meeting the requirements of high-rate fast charging (2C and above fast charging).

[0036] like Figure 5 As shown, in some embodiments, the substrate 10 includes a first plate 13, an arched plate 14, and a second plate 15 connected in sequence, with two connecting regions located on the first plate 13 and the second plate 15, respectively.

[0037] In the above technical solution, when the battery cell 2 expands during charging and discharging, the thickness of the battery cell 2 increases, which will generate tensile forces F1 and F2 on the electrical connection structure. When F1 and F2 are large enough, the arched plate 14 will deform. The arched plate 14 can absorb the tensile forces F1 and F2 generated by the expansion, so as to lengthen the electrical connection structure 1 and avoid the failure of the solder joint between the electrical connection structure 1 and the electrode tab 212 of the battery cell 2.

[0038] like Figures 1 to 5 As shown, in some embodiments, a recess 16 is provided on the connection area, and the recess 16 is recessed into the substrate 10 from the first side 11 toward the second side 12. In this way, the thickness of the welding plane between the electrical connection structure 1 and the electrode tab 212 of the battery cell 2 can be reduced to ensure that the laser welding can penetrate the electrical connection structure 1.

[0039] like Figures 1 to 5 As shown, in some embodiments, the protruding member 20 is provided with two clearance grooves 23. Along the height direction Z, the clearance grooves 23 penetrate the protruding member 20, and the two clearance grooves 23 are respectively connected to two recesses 16. The projected area of ​​the clearance grooves 23 on the first side surface 11 is larger than the projected area of ​​the recesses 16 on the first side surface 11. Since the electrical connector busbar needs to be pressed tightly to the electrode lug by a tool during welding, in this application, two clearance grooves 23 are provided on the electrical connection structure 1. The stepped surface between the clearance grooves 23 and the recesses 16 can provide a pressing platform for the tooling.

[0040] In some embodiments, depending on the actual tooling design, the clearance groove 23 may not be required.

[0041] like Figures 1 to 5 As shown, in some embodiments, a viewing hole 161 is provided on the bottom wall of the recess 16. In this way, the viewing hole 161 can correspond to the positioning hole 211 of the battery cell, so as to facilitate the installation of the electrical connection structure 1 on the battery cell 2.

[0042] In some embodiments, the cross-sectional area S of the electrical connection structure 1 is determined according to the magnitude of the overcurrent. Generally, the unit cross-sectional area can carry a current of 2A to 8A, that is, the overcurrent capacity of the electrical connection structure 1 is 2A / mm². 2 ~8A / mm 2 In actual design, the cross-sectional area of ​​the electrical connection structure 1 can be adjusted by adjusting the number and height of the first protrusion 21 and the second protrusion 22.

[0043] In some embodiments, when the width W of the electrical connection structure 1 is small, the current carrying capacity can be increased by increasing the height of the first protrusion 21 and the second protrusion 22, thereby satisfying a larger current carrying requirement in a smaller space.

[0044] like Figure 1As shown, an embodiment of the present invention provides a battery cell assembly, including multiple battery cells 2 and the aforementioned electrical connection structure 1. The multiple battery cells 2 are arranged in sequence, and the tabs 212 of two adjacent battery cells 2 are electrically connected through the electrical connection structure 1.

[0045] In some embodiments, the electrical connection structure 1 is installed on the upper part of the battery cell 2, and the electrical connection structure 1 is fixed to the electrode tab 212 of the battery cell 2 by means of welding, bolt connection or other means to realize the conduction of current.

[0046] It should be noted that in the embodiments of this utility model, the length direction X, width direction Y, and height direction Z of the base are arranged at angles to each other.

[0047] The above-mentioned battery cell assembly has all the advantages of the above-mentioned electrical connection structure 1, which will not be repeated here.

[0048] like Figure 1 As shown, an embodiment of the present invention provides a battery pack, including a battery box and the aforementioned cell assembly, wherein the cell assembly is installed inside the battery box.

[0049] The battery pack described above has all the advantages of the aforementioned cell assembly, which will not be elaborated here.

[0050] As can be seen from the above description, the embodiments of this utility model achieve the following technical effects: two spaced-apart connection areas are used to connect two battery cells. By providing a protruding member extending away from the second side in the non-connection area on the first side, the cross-sectional area of ​​the electrical connection structure is increased, thereby increasing its current-carrying area and enhancing its current-carrying capacity. In addition, the protruding member includes multiple spaced-apart protrusions, increasing the heat dissipation area of ​​the electrical connection structure and reducing the risk of battery cell performance degradation due to heat generation. Therefore, this technical solution not only improves the current-carrying capacity of the electrical connection structure but also optimizes heat dissipation performance, ensuring the normal operation of the battery cells, and is particularly suitable for applications requiring fast charging and space constraints.

[0051] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An electrical connection structure, characterized in that, include: The substrate (10) has a first side surface (11) and a second side surface (12) disposed opposite to each other along the height direction (Z) of the substrate (10). Along the length direction (X) of the substrate (10), the first side surface (11) has two connecting regions disposed at intervals. The protruding member (20) is connected to the area on the first side (11) other than the connection area. The protruding member (20) extends in the height direction (Z) away from the second side (12) to increase the current carrying capacity of the electrical connection structure. The protruding member (20) includes a plurality of protrusions spaced apart to increase the heat dissipation area of ​​the electrical connection structure.

2. The electrical connection structure according to claim 1, characterized in that, The plurality of protrusions are spaced apart along the width direction (Y) of the base (10).

3. The electrical connection structure according to claim 2, characterized in that, The plurality of the protrusions are first protrusions (21) and second protrusions (22), there are at least two first protrusions (21) and two second protrusions (22), the first protrusions (21) and the connecting area are both located between the two second protrusions (22), along the length direction (X), the second protrusions (22) extend from one end of the base (10) to the other end of the base (10).

4. The electrical connection structure according to claim 3, characterized in that, The height h2 of the second protrusion (22) is greater than or equal to the height h1 of the first protrusion (21).

5. The electrical connection structure according to claim 1, characterized in that, The plurality of protrusions are spaced apart along the length direction (X) of the base (10).

6. The electrical connection structure according to claim 5, characterized in that, The substrate (10) includes a first plate (13), an arched plate (14), and a second plate (15) connected in sequence, with the two connecting areas located on the first plate (13) and the second plate (15), respectively.

7. The electrical connection structure according to any one of claims 1 to 6, characterized in that, The connecting area is provided with a recess (16), which is recessed into the substrate (10) from the first side (11) toward the second side (12).

8. The electrical connection structure according to claim 7, characterized in that, The protruding member (20) is provided with two clearance grooves (23), which penetrate the protruding member (20) along the height direction (Z). The two clearance grooves (23) are respectively connected to the two recesses (16). The projected area of ​​the clearance groove (23) on the first side surface (11) is greater than the projected area of ​​the recess (16) on the first side surface (11); and / or, A viewing hole (161) is provided on the bottom wall of the recess (16).

9. A battery cell assembly, characterized in that, It includes a plurality of battery cells (2) and an electrical connection structure (1) according to any one of claims 1 to 8, wherein the plurality of battery cells (2) are arranged in sequence, and the tabs of two adjacent battery cells (2) are electrically connected through the electrical connection structure (1).

10. A battery pack, characterized in that, It includes a battery box and the cell assembly as described in claim 9, wherein the cell assembly is installed inside the battery box.

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