Chip used for being connected with power battery and power battery module

Abstract

The utility model discloses a piece used for being connected with a power battery, the piece is provided with a first end used for being connected with the power battery, the first end is provided with a folding portion formed by folding towards the upper portion of the piece, the folding portion is arranged on the first portion of the piece in an overlapped mode, and a first through hole is formed in the middle of the folding portion. According to the utility model, the sheet is folded to increase the thickness of the welding position of the sheet, so that the ultrathin sheet base material is selected on the premise of meeting the charging and discharging overcurrent requirements of the power battery, the structural strength of the laser welding position of the sheet and the heat dissipation capability of the welding position are ensured, the sheet can be thinned, the weight of the module can be reduced, and the production cost is reduced. The manufacturing cost of the module is reduced, and the weight of the module is reduced, so that the cruising ability of the new energy vehicle is correspondingly improved.

Description

Technical Field

[0001] The utility model relates to the field of power batteries, and in particular to a bar used for connecting to a power battery and a power battery module. Background Art

[0002] At present, lithium-ion / sodium-ion cylindrical batteries have gradually become mainstream products in the new energy industry due to their high energy density, good capacity consistency, and support for high-rate charge and discharge. More and more manufacturers are pursuing the simplification of cylindrical battery / module structures to achieve cost reduction, weight reduction, and increased range. Common problems: 1. For cylindrical power battery busbars, generally considering welding strength, busbars will use thicker aluminum, copper or nickel sheets, etc., which have higher manufacturing costs; 2. Thicker busbars will make the battery module heavier, affecting the long range of new energy vehicles. 3. Generally, thinner busbars can meet the battery charge and discharge overcurrent requirements, but considering the welding strength, thickening the busbars is an over-designed nature, and a balance needs to be found, that is, thinning while meeting the welding strength of the busbars. Summary of the invention

[0003] The utility model aims to provide a tab connected to a power battery and a power battery module, so as to solve the problem that the thickness of the existing tab is relatively thick, resulting in a heavier battery module.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a tab for connecting to a power battery, wherein the tab is provided with a first end for connecting to the power battery, the first end is provided with a folding portion folded upwardly of the tab, the folding portion is stacked on the first portion of the tab, and a first through hole is provided in the middle of the folding portion.

[0005] Preferably, the thickness of the bar sheet is greater than or equal to 0.1 mm and less than or equal to 0.6 mm.

[0006] Preferably, a second through hole is formed on the first portion corresponding to the first through hole.

[0007] Preferably, the bar is made of aluminum, copper or nickel.

[0008] Preferably, the bar sheet is in a strip-shaped structure.

[0009] The utility model also provides a battery module, including a power battery and the above-mentioned bar for connecting to the power battery, one end of the power battery is provided with a pole and the other end of the power battery is provided with a bottom shell, the first part is attached to the pole, the folded part and the first part are both connected to the pole by laser welding, and a first welding track formed by the folded part and the first part being connected to the pole by laser welding is arranged around the first through hole.

[0010] Preferably, the first welding track is in the shape of a circular ring.

[0011] The utility model also provides another battery module, including a power battery and the above-mentioned bar for connecting to the power battery, one end of the power battery is provided with a pole and the other end of the power battery is provided with a bottom shell, the first part is attached to the bottom shell, and the folded part and the first part are both laser welded to the bottom shell, and a second welding track formed by the folded part and the first part being laser welded to the bottom shell is arranged around the first through hole.

[0012] Preferably, the second welding track is in a spiral structure.

[0013] Compared with the prior art, the utility model folds the bar to increase the thickness at the bar welding position, so that an ultra-thin bar substrate can be selected while meeting the overcurrent requirements of the power battery charge and discharge. This not only ensures the structural strength of the bar laser welding position and the heat dissipation capacity of the welding position, but also achieves the purpose of thinning the bar, reduces the weight of the module, reduces the module manufacturing cost, and the module weight reduction also correspondingly increases the endurance of the new energy vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a structural diagram of the bar in the embodiment of the utility model.

[0015] Figure 2 It is a cross-sectional view of a bar in an embodiment of the utility model.

[0016] Figure 3 It is a structural diagram of a bar overlapped on a power battery pole in an embodiment of the utility model.

[0017] Figure 4 for Figure 3 sectional view of .

[0018] Figure 5 for Figure 4 Enlarged view of point A in the middle.

[0019] Figure 6 This is a structural diagram of the welding of the bar and the pole in the embodiment of the utility model.

[0020] Figure 7 This is a structural diagram of the bar plate overlapped on the bottom shell in an embodiment of the utility model.

[0021] Figure 8 This is a structural diagram of the welding of the bar plate and the bottom shell in the embodiment of the utility model. DETAILED DESCRIPTION

[0022] In order to explain the technical content, structural features and effects achieved by the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0023] like Figures 1 to 8 As shown, an embodiment of the utility model provides a tab for connecting to a power battery, the tab 1 is provided with a first end for connecting to a power battery 10, the first end is provided with a folding portion 11 formed by folding upwards of the tab 1, the folding portion 11 is stacked on the first portion 12 of the tab 1, and a first through hole 13 is provided in the middle of the folding portion 11. Specifically, the first portion 12 refers to a portion of the tab 1 that is located below the folding portion 11 and is in contact with the folding portion 11, one end of the power battery 10 is provided with a pole 21 and the other end of the power battery 10 is provided with a bottom shell 4, the pole 21 is specifically provided on the top cover 2 of the power battery 10, the folded folding portion 11 and the first portion 12 can be used for welding connection with the pole 21 of the power battery 10, and can also be used for welding connection with the bottom shell 4 of the power battery 10, the tab 1 and the power battery 10 are specifically connected by laser welding, and the thickness of the tab 1 at the welding position can be increased by folding the tab 1, so that An ultra-thin substrate can be selected for the bar piece 1 without affecting the structural strength of the welding position, and the process is relatively simple and the design is ingenious. In addition, the first through hole 13 set in the middle of the folding portion 11 can be used for positioning during laser welding and can facilitate heat dissipation. The embodiment of the utility model uses an ultra-thin bar piece 1 substrate on the premise of meeting the overcurrent requirements of the power battery 10 for charging and discharging, which not only ensures the structural strength of the laser welding position of the bar piece 1 and the heat dissipation capacity of the welding position, but also achieves the purpose of thinning the bar piece 1, which can reduce the weight of the module, reduce the manufacturing cost of the module, and the weight reduction of the module also correspondingly increases the endurance of the new energy vehicle.

[0024] In the embodiment of the utility model, the thickness of the bar sheet 1 is greater than or equal to 0.1 mm and less than or equal to 0.6 mm. Therefore, the sum of the heights of the welding positions formed by the folded portion 11 and the first portion 12 is greater than or equal to 0.2 mm and less than or equal to 1.2 mm. Under the premise of meeting the overcurrent requirements of the power battery 10 for charging and discharging, the structural strength of the laser welding position of the bar sheet 1 is ensured, and the cost is lower and the design is ingenious. Of course, the thickness of the bar sheet 1 is not limited to this and can be selected according to actual needs.

[0025] In the embodiment of the utility model, a second through hole 14 is formed on the first portion 12 corresponding to the first through hole 13. Figure 2 As shown, the first through hole 13 and the second through hole 14 are arranged in alignment to form a through hole. The arrangement of the second through hole 14 can further reduce the weight of the module and increase the heat dissipation performance.

[0026] In the embodiment of the present invention, the material of the bar plate 1 is aluminum, copper or nickel. Of course, the specific material of the bar plate 1 is not limited thereto and can be selected according to actual needs.

[0027] In the embodiment of the utility model, the tab 1 is in a strip-shaped structure. Specifically, the tab 1 is in a strip-shaped structure for connecting different power batteries 10. Of course, the specific structure of the tab 1 is not limited, as long as the end connected to the power battery 10 is provided with a folding portion 11 that can be welded to the power battery 10.

[0028] An embodiment of the utility model also provides a battery module, including a power battery 10 and the above-mentioned bar 1 for connecting to the power battery 10, one end of the power battery 10 is provided with a pole 21 and the other end of the power battery 10 is provided with a bottom shell 4, the first part 12 is attached to the pole 21, the folding part 11 and the first part 12 are both laser-welded to the pole 21, and the first welding track 31 formed by the laser-welding connection between the folding part 11 and the first part 12 and the pole 21 is arranged around the first through hole 13. Specifically, in the embodiment of the utility model, the power battery 10 is a cylindrical power battery, one end of the power battery 10 is provided with a positive pole 21, and the other end is provided with a negative bottom shell 4, the bottom shell 4 is the bottom of the shell of the power battery 10, the bottom shell 4 can be the bottom of an integrally formed shell, or it can be a separately arranged bottom welding piece and welded to the bottom of the shell, when the tab 1 is welded to the pole 21, the tab 1 is first overlapped on the pole 21, and then the first welding track 31 is used to laser weld and fix it to the pole 21 from the folding portion 11 to the pole 21. The first welding track 31 is circular ring-shaped so that the tab 1 and the pole 21 are welded more firmly and the welding effect is better.

[0029] The embodiment of the utility model further provides a battery module, including a power battery 10 and the above-mentioned bar sheet 1 for connecting with the power battery 10, one end of the power battery 10 is provided with a pole 21 and the other end of the power battery 10 is provided with a bottom shell 4, the first part 12 is attached to the bottom shell 4, and the folding part 11 and the first part 12 are both laser-welded to the bottom shell 4, and the second welding track 32 formed by the laser welding connection between the folding part 11 and the first part 12 and the bottom shell 4 is arranged around the first through hole 13. Specifically, the bar sheet 1 is used to connect a plurality of power batteries 10, and the bar sheet 1 can be used to connect the pole 21, and can also be used to connect the bottom shell 4. When the bar sheet 1 is welded to the bottom shell 4, the bar sheet 1 is first overlapped on the bottom shell 4, and then the second welding track 32 is used to laser-weld and fix with the bottom shell 4 from the folding part 11 to the bottom shell 4, and the second welding track 32 is in a spiral structure, the welding area can be larger, and the welding effect is good.

[0030] The battery module of the utility model embodiment folds the bar piece 1 to increase the thickness of the bar piece 1 at the welding position, so that the bar piece 1 can use an ultra-thin substrate without affecting the structural strength of the welding position. The process is relatively simple to implement and the design is ingenious. In addition, a first through hole 13 is provided in the middle of the folding portion 11, which can be used for centering during laser welding and convenient heat dissipation. Under the premise of meeting the overcurrent requirements of the cylindrical power battery for charging and discharging, the utility model embodiment uses an ultra-thin bar piece 1 substrate, which not only ensures the structural strength of the laser welding position of the bar piece 1 and the heat dissipation capacity of the welding position, but also achieves the purpose of thinning the bar piece 1, which can reduce the weight of the module, reduce the manufacturing cost of the module, etc. The weight reduction of the module also correspondingly increases the endurance of the new energy vehicle, and the design is ingenious.

[0031] The above disclosure is only a preferred example of the present invention, and certainly cannot be used to limit the scope of rights of the present invention. Therefore, equivalent changes made according to the scope of the patent application of the present invention still fall within the scope covered by the present invention.

Claims

1. A bar for connecting to a power battery, characterized in that: The tab is provided with a first end for connecting to the power battery, the first end is provided with a folding portion folded upwardly from the tab, the folding portion is stacked on the first portion of the tab, and a first through hole is provided in the middle of the folding portion.

2. The bar for connecting to a power battery according to claim 1, characterized in that: The thickness of the bar sheet is greater than or equal to 0.1 mm and less than or equal to 0.6 mm.

3. The bar for connecting to a power battery according to claim 1, characterized in that: The first portion is provided with a second through hole corresponding to the first through hole.

4. The bar for connecting to a power battery according to claim 1, characterized in that: The material of the bar is aluminum, copper or nickel.

5. The bar for connecting to a power battery according to claim 1, characterized in that: The bar sheet is in a strip-shaped structure.

6. A battery module, characterized in that: It includes a power battery and a bar for connecting to the power battery as described in any one of claims 1 to 5, wherein a pole is provided at one end of the power battery and a bottom shell is provided at the other end of the power battery, the first part is attached to the pole, the folded part and the first part are both laser-welded to the pole, and a first welding track formed by the laser-welding connection between the folded part and the first part and the pole is arranged around the first through hole.

7. The battery module according to claim 6, characterized in that: The first welding track is in a circular ring shape.

8. A battery module, characterized in that: It includes a power battery and a bar for connecting to the power battery as described in any one of claims 1 to 5, wherein one end of the power battery is provided with a pole and the other end of the power battery is provided with a bottom shell, the first part is attached to the bottom shell, and the folded part and the first part are both laser-welded to the bottom shell, and a second welding track formed by the folded part and the first part being laser-welded to the bottom shell is arranged around the first through hole.

9. The battery module according to claim 8, characterized in that: The second welding track is in a spiral structure.

Images