Collecting plate and battery thereof

Abstract

The utility model provides a collector plate and a battery thereof. The collector plate comprises a connecting piece, one end of the connecting piece is used for being electrically connected with a shell of the battery, the other end of the connecting piece is used for being electrically connected with a tab of the battery, the connecting piece comprises at least one bending area, and a strength reducing structure is arranged on the bending area and used for reducing the strength of the bending area. In the application, the strength of the bending area can be reduced by the strength reducing structure, and when the connecting piece is bent, the bending area is easier to deform, so that the difficulty of bending operation is favorably reduced, and the battery assembly efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, specifically to a current collector and its battery. Background Technology

[0002] In the current battery manufacturing process, the current collector is typically placed on the end face of the cell, and then the current collector and the cell are welded together as a whole. The cell with the current collector welded on is then placed into the battery casing, and the connectors on the current collector are then welded to the battery casing.

[0003] In related technologies, when welding the current collector to the battery casing, the connector needs to be bent first to improve the compatibility between the connector and the battery casing and the welding effect. However, bending the connector is difficult, which affects the battery assembly efficiency. Utility Model Content

[0004] The embodiments of this application provide a current collector and its battery, which can solve the technical problem that the connector has high strength and requires greater external force to achieve the expected bending effect during the bending process, thus increasing the difficulty of bending the connector.

[0005] In a first aspect, embodiments of this application provide a data collection disk, comprising:

[0006] A connector, one end of which is used for electrical connection with the battery casing and the other end of which is used for electrical connection with the battery tabs, the connector including at least one bending area, the bending area having a reinforcing structure for reducing the strength of the bending area.

[0007] In one embodiment, the connector further includes a first connecting portion and a second connecting portion, the second connecting portion being used for electrical connection with the battery casing, the first connecting portion being used for electrical connection with the battery tabs, and the bending area being bent between the first connecting portion and the second connecting portion so that the first connecting portion and the second connecting portion are set at an angle.

[0008] In one embodiment, the reinforcing structure includes openings.

[0009] In one embodiment, the aperture of the opening is R, where 0 < R ≤ 10 mm.

[0010] In one embodiment, the area of ​​the opening is S1, the total area of ​​the connector is S0, and 2% ≤ S1 / S0 ≤ 40%.

[0011] In one embodiment, the number of openings is multiple.

[0012] In one embodiment, the plurality of openings are spaced apart.

[0013] In one embodiment, the centroid distance between two adjacent openings is D1, where 0.5mm ≤ D1 ≤ 62mm.

[0014] In one embodiment, the bending area has a crease, and the plurality of openings are arranged along the crease.

[0015] In one embodiment, the plurality of openings are distributed at equal intervals on the bending area.

[0016] In one embodiment, the reinforcing structure includes a groove.

[0017] In one embodiment, the groove has a bottom wall with a thickness of T1, and the thickness of the first connecting portion or the second connecting portion is T0, where 20% ≤ T1 / T0 ≤ 95%.

[0018] In one embodiment, the groove has a bottom wall with an area of ​​S2, and the total area of ​​the connector is S0, where 2% ≤ S2 / S0 ≤ 40%.

[0019] In one embodiment, the number of grooves is multiple.

[0020] In one embodiment, the bending area has a crease, and the plurality of grooves are arranged along the crease.

[0021] In one embodiment, the plurality of grooves are distributed at equal intervals on the bending area.

[0022] In one embodiment, the reinforcing structure includes openings and grooves.

[0023] In one embodiment, the included angle between the first connecting portion and the second connecting portion is greater than 0° and less than 180°.

[0024] In one embodiment, the collector plate further includes a plate body, and the first connecting portion is integrally formed with the plate body, or the first connecting portion is welded to the plate body.

[0025] Secondly, embodiments of this application provide a battery, including a cell and a current collector as described above.

[0026] In one embodiment, the current collector includes a disk body, the disk body including a first metal layer and a second metal layer connected to each other, the first metal layer being connected to the battery cell, the second metal layer being located on the side of the first metal layer away from the battery cell, and the first metal layer and the second metal layer being made of different materials.

[0027] In one embodiment, the material of the first metal layer is copper; and / or

[0028] The material of the second metal layer is nickel metal; and / or

[0029] The connector is made of nickel metal.

[0030] In one embodiment, the sum of the thicknesses of the first metal layer and the second metal layer is T2, the thickness of the first metal layer is T3, and 0% < T3 / T2 ≤ 99%.

[0031] In one embodiment, 40% ≤ T3 / T2 ≤ 60%.

[0032] In one embodiment, the current collector further includes a disk body, the outer diameter of the disk body is D2, and the outer diameter of the battery cell is D3, where 50% ≤ D2 / D3 ≤ 150%.

[0033] In one embodiment, 80% ≤ D2 / D3 ≤ 120%.

[0034] In one embodiment, the overlap area between the current collector and the battery cell along the axial direction of the battery cell is S3, and the welding area between the current collector and the battery cell is S4, where 0 < S4 / S3 ≤ 100%.

[0035] In one embodiment, 5% < S4 / S3 ≤ 50%.

[0036] The beneficial effects of the embodiments of this application are as follows:

[0037] The current collector in this embodiment includes a connector. One end of the connector is electrically connected to the battery casing, and the other end is electrically connected to the battery tabs. The connector includes at least one bending region with a reinforcing structure to reduce the strength of the bending region. In this application, the reinforcing structure reduces the strength of the bending region, making it easier for the bending region to deform when the connector is bent. This helps reduce the difficulty of the bending operation and improves battery assembly efficiency. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This is a top view of the manifold provided in an embodiment of this application;

[0040] Figure 2 This is a perspective view of the connector provided in an embodiment of this application;

[0041] Figure 3This is a perspective view of a connector provided in another embodiment of this application;

[0042] Figure 4 This is a cross-sectional view of the connector provided in the embodiments of this application;

[0043] Figure 5 This is a perspective view of a connector provided in another embodiment of this application;

[0044] Figure 6 This is a front view of the battery provided in an embodiment of this application;

[0045] Figure 7 This is a cross-sectional view of the battery provided in an embodiment of this application;

[0046] Figure 8 This application Figure 7 A magnified view of a portion of point A in the middle.

[0047] Figure label:

[0048] 100. Battery; 1. Current collector; 11. Disk body; 111. First metal layer; 112. Second metal layer; 12. Connector; 121. First connecting part; 122. Bending area; 1220. Reinforcing structure; 1221. Opening; 1222. Groove; 1223. Bottom wall; 1224. Crease; 123. Second connecting part; 2. Cell; 21. Tab; 3. Casing. Detailed Implementation

[0049] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application. In addition, it should be understood that the specific embodiments described herein are only for illustration and explanation of this application and are not intended to limit this application. In this application, unless otherwise stated, directional terms such as "upper" and "lower" generally refer to the upper and lower positions of the device in actual use or operation, specifically the drawing directions in the accompanying drawings; while "inner" and "outer" refer to the outline of the device.

[0050] Please refer to Figures 1 to 5The current collector 1 of this application includes a connector 12. One end of the connector 12 is electrically connected to the outer casing 3 of the battery 100, and the other end is electrically connected to the electrode tab 21 of the battery 100. The connector 12 includes at least one bending region 122, and a reinforcing structure 1220 is provided on the bending region 122 to reduce the strength of the bending region 122. In this application, the reinforcing structure 1220 can reduce the strength of the bending region 122. When bending the connector 12, the bending region 122 is more likely to deform, which helps to reduce the difficulty of bending operations and improve the assembly efficiency of the battery 100.

[0051] In this embodiment, the number of connectors 12 is not limited; there may be one, two, or more connectors 12. The specific shape of the connectors 12 is not limited; they may be fan-shaped, rectangular, or other shapes. The material of the connectors 12 is not limited; they may be nickel metal, stainless steel, or other conductive materials.

[0052] In one embodiment, please refer to Figure 4 The connector 12 also includes a first connecting portion 121 and a second connecting portion 123. The second connecting portion 123 is used for electrical connection with the outer casing 3 of the battery 100, and the first connecting portion 121 is used for electrical connection with the tab 21 of the battery 100. The bending area 122 is bent and connected between the first connecting portion 121 and the second connecting portion 123 so that the first connecting portion 121 and the second connecting portion 123 are set at an angle.

[0053] In one specific embodiment, please refer to Figures 6 to 8 The current collector 1 includes a disk body 11, which is connected to the electrode tab 21. A first connecting part 121 is fixed on the disk body 11 and is electrically connected to the electrode tab 21 through the disk body 11. A second connecting part 123 is connected to the outer casing 3 of the battery.

[0054] In one embodiment, please refer to Figure 3 The reinforcing structure 1220 includes an opening 1221. By providing the opening 1221 in the bending area 122, the strength of the bending area 122 can be reduced, allowing the bending area 122 to bend more smoothly and reducing the difficulty of bending the connector 12. In this embodiment, the shape of the opening 1221 is not limited; the shape of the opening 1221 can be circular, rectangular, triangular, or other shapes. The number of openings 1221 is also not limited; the number of openings 1221 can be one, two, or more.

[0055] In one embodiment, the aperture of the opening 1221 is R, where 0 < R ≤ 10 mm. Optionally, the aperture R of the opening 1221 can be any one or any two of the following: 0.01 mm, 0.06 mm, 0.1 mm, 0.5 mm, 1.0 mm, 3.0 mm, 5.0 mm, 8.0 mm, 10.0 mm, etc.

[0056] In one embodiment, the area of ​​the opening 1221 is S1, the total area of ​​the connector 12 is S0, and 2% ≤ S1 / S0 ≤ 40%. Optionally, the value of S1 / S0 can be any one or any two of 2%, 5%, 8%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, etc.

[0057] In this embodiment, if the value of S1 / S0 is too small, the area of ​​the opening 1221 will be too small, and the effect of the opening 1221 in reducing the strength of the bending region 122 will not be ideal. If the value of S1 / S0 is too large, the area of ​​the opening 1221 will be too large, and the overall strength and current carrying capacity of the bending region 122 will be too small. When processing the connector 12, the connector 12 is prone to breakage at the bending region 122. In addition, the low current carrying capacity of the bending region 122 can limit the performance of the battery 100. Setting the value of S1 / S0 between 2% and 40% can reduce the strength of the bending region 122 while ensuring the overall strength and current carrying capacity of the bending region 122.

[0058] In one embodiment, please refer to Figure 3 There are multiple openings 1221. Multiple openings 1221 can more effectively disperse the stress generated during bending and avoid stress concentration leading to breakage of the bending area 122.

[0059] In one embodiment, please refer to Figure 3 Multiple openings 1221 are spaced apart, with the centroid distance between two adjacent openings 1221 being D1, where 0.5mm ≤ D1 ≤ 62mm. Optionally, the value of D1 can be any one or any two of the following: 0.5mm, 1.0mm, 2.0mm, 4.0mm, 7.0mm, 10.0mm, 15.0mm, 30.0mm, 40.0mm, 50.0mm, 60.0mm, and 62.0mm. In this embodiment, the centroid is the geometric center of the opening 1221. In this embodiment, if the value of D1 is too small, the connection between two adjacent openings 1221 may break, resulting in insufficient overall strength of the bending area 122. If the value of D1 is too large, the effect of the openings 1221 in reducing the strength of the bending area 122 may be unsatisfactory.

[0060] In one embodiment, please refer to Figure 3A crease 1224 is provided on the bending area 122, and multiple openings 1221 are arranged along the crease 1224. In this embodiment, the crease 1224 on the bending area 122 can serve as a guide line for the bending operation, indicating the direction and angle of the bend, which helps to improve the accuracy and effect of bending the connector 12; the multiple openings 1221 arranged along the crease 1224 can reduce the strength at the crease 1224, making the bending operation easier.

[0061] In one embodiment, please refer to Figure 3 Multiple openings 1221 are evenly distributed on the bending area 122. The even distribution of multiple openings 1221 can ensure that the stress distribution in all directions of the bending area 122 is relatively balanced during the bending process, thereby reducing the occurrence of bending deformation or twisting caused by uneven stress.

[0062] In one embodiment, please refer to Figure 2 The reinforcing structure 1220 includes a groove 1222. By providing a groove 1222 on the bending area 122, the strength of the bending area 122 can be reduced, allowing the bending area 122 to bend more smoothly and reducing the difficulty of bending the connector 12. In this embodiment, the shape of the groove 1222 is not limited; the shape of the groove 1222 can be circular, rectangular, trapezoidal, or other shapes. The number of grooves 1222 is also not limited; the number of grooves 1222 can be one, two, or more.

[0063] In one embodiment, the groove 1222 has a bottom wall 1223 with a thickness of T1, and the thickness of the first connecting portion 121 or the second connecting portion 123 is T0, where 20% ≤ T1 / T0 ≤ 95%. Optionally, the value of T1 / T0 can be any one or any two of 20%, 30%, 40%, 50%, 60%, 70%, 80%, 90%, 95%, etc.

[0064] In this embodiment, if the value of T1 / T0 is too small, the thickness of the bottom wall 1223 of the groove 1222 will be too small, resulting in insufficient overall strength and current carrying capacity of the bending area 122. During the processing of the connector 12, the connector 12 is prone to breakage at the bending area 122. Furthermore, the low current carrying capacity of the bending area 122 can limit the performance of the battery 100. Conversely, if the value of T1 / T0 is too large, the thickness of the bottom wall 1223 of the groove 1222 will be too large, and the effect of the groove 1222 in reducing the strength of the bending area 122 will be unsatisfactory. Setting the value of T1 / T0 between 20% and 95% ensures both the overall strength and current carrying capacity of the bending area 122 while reducing its strength.

[0065] In one embodiment, the area of ​​the bottom wall 1223 of the groove 1222 is S2, and the total area of ​​the connector 12 is S0, where 2% ≤ S2 / S0 ≤ 40%. Optionally, the value of S2 / S0 can be any one or any two of 2%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, etc.

[0066] In this embodiment, if the value of S2 / S0 is too small, the area of ​​the bottom wall 1223 of the groove 1222 will be too small, and the effect of the groove 1222 in reducing the strength of the bending area 122 will not be ideal. If the value of S2 / S0 is too large, the area of ​​the bottom wall 1223 of the groove 1222 will be too large, and the overall strength and current carrying capacity of the bending area 122 will be too small. When processing the connector 12, the connector 12 is prone to breakage at the bending area 122. In addition, the current carrying capacity of the bending area 122 is too low, which can limit the performance of the battery 100.

[0067] In one embodiment, there are multiple grooves 1222. In this embodiment, multiple grooves 1222 can more effectively disperse the stress generated during bending, avoiding stress concentration that could lead to breakage of the bending area 122.

[0068] In one embodiment, a crease 1224 is provided on the bending area 122, and multiple grooves 1222 are arranged along the crease 1224. In this embodiment, the crease 1224 on the bending area 122 can serve as a guide line for the bending operation, indicating the direction and angle of the bend, which helps to improve the accuracy and effect of bending the connector 12; the multiple grooves 1222 arranged along the crease 1224 can reduce the strength at the crease 1224, making the bending operation easier.

[0069] In one embodiment, a plurality of grooves 1222 are equally spaced on the bending area 122. In this embodiment, the equal distribution of the plurality of grooves 1222 can ensure that the stress distribution in all directions of the bending area 122 is relatively balanced during the bending process, thereby reducing the occurrence of bending deformation or twisting caused by uneven stress.

[0070] In one embodiment, reference Figure 5 The reinforcing structure 1220 may include both an opening 1221 and a groove 1222. The positional relationship between the opening 1221 and the groove 1222 is not limited. The opening 1221 and the groove 1222 may be set alternately, and the opening 1221 may also be set in the groove 1222.

[0071] In one embodiment, reference Figure 4The included angle between the first connecting part 121 and the second connecting part 123 is α, where α is greater than 0° and less than 180°. Optionally, the included angle α between the first connecting part 121 and the second connecting part 123 can be any one or any two of the following: 0.01°, 1°, 5°, 10°, 30°, 60°, 90°, 120°, 150°, 179°.

[0072] In one embodiment, the collector plate 1 further includes a plate body 11, and the first connecting part 121 is integrally formed with the plate body 11. The integrally formed connection method can simplify the connection process between the first connecting part 121 and the plate body 11, and at the same time, can increase the overall structural stability of the collector plate 1.

[0073] In one embodiment, the first connecting part 121 is welded to the disk body 11. In this embodiment, the welding connection can directly connect the first connecting part 121 to the disk body 11, which can simplify the production process and improve the yield of the manifold 1. Optionally, the type of welding connection is not limited, and the welding connection can be laser welding, ultrasonic welding, arc welding or other types of welding methods.

[0074] This application also provides a battery 100, for reference. Figure 4 and Figure 5 The battery 100 includes a cell 2 and a current collector 1 as described above.

[0075] In one embodiment, reference Figure 6 The disk body 11 includes a first metal layer 111 and a second metal layer 112 connected to each other. The first metal layer 111 is connected to the battery cell 2, and the second metal layer 112 is located on the side of the first metal layer 111 away from the battery cell 2. The first metal layer 111 and the second metal layer 112 are made of different materials. In this embodiment, the second metal layer 112 can protect the first metal layer 111, improving the oxidation resistance and wear resistance of the first metal layer 111.

[0076] In this embodiment, the material type of the first metal layer 111 is not limited, and the first metal layer 111 can be made of materials such as copper, copper alloy, aluminum alloy, and aluminum. The material type of the second metal layer 112 is not limited, and the second metal layer 112 can be made of materials such as nickel alloy, stainless steel, and titanium alloy.

[0077] In one embodiment, the first metal layer 111 is made of copper, the second metal layer 112 is made of nickel, and the connector 12 is made of nickel.

[0078] In one embodiment, the sum of the thicknesses of the first metal layer 111 and the second metal layer 112 is T2, the thickness of the first metal layer 111 is T3, and 0% < T3 / T2 ≤ 99%. Optionally, the value of T3 / T2 can be any one or any two of the following: 0.01%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80%, 90%, 99%.

[0079] In one embodiment, 40% ≤ T3 / T2 ≤ 60%. Optionally, the value of T3 / T2 can be any one or any two of 40%, 45%, 50%, 55%, 60%, etc. In this embodiment, if the value of T3 / T2 is too small, the thickness of the first metal layer 111 may be too small. When welding the first metal layer 111 and the battery cell 2, heat sources such as lasers and electric arcs may easily penetrate the first metal layer 111 and come into contact with the battery cell 2, damaging the structure of the battery cell 2. If the value of T3 / T2 is too large, the thickness of the first metal layer 111 may be too large. When welding the first metal layer 111 and the battery cell 2, higher energy input and welding time are required to ensure the penetration of the weld, increasing the time and material costs of welding.

[0080] In one embodiment, the current collector 1 further includes a disk body 11, the outer diameter of the disk body 11 is D2, and the outer diameter of the cell 2 is D3, where 50% ≤ D2 / D3 ≤ 150%. Optionally, the value of D2 / D3 can be any one or any two of 50%, 60%, 70%, 80%, 90%, 100%, 110%, 120%, 130%, 140%, 150%, etc. In this embodiment, if the value of D2 / D3 is too small, the outer diameter of the disk body 11 is too small, reducing the current carrying capacity of the current collector 1; if the value of D2 / D3 is too large, the outer diameter of the disk body 11 is too large, requiring a larger outer casing 3 to assemble with the current collector 1, resulting in wasted space in the battery 100 and increasing the volume of the battery 100, which is not conducive to the miniaturization of the battery 100.

[0081] In one embodiment, 80% ≤ D2 / D3 ≤ 120%. Optionally, the value of D2 / D3 can be any one or any two of 80%, 90%, 100%, 110%, 120%, etc. In this embodiment, controlling the value of D2 / D3 within the range of 80%-120% can further ensure the current carrying capacity of the current collector 1, while saving space in the battery 100 and facilitating the miniaturization of the battery 100.

[0082] In one embodiment, the overlap area between the current collector 1 and the battery cell 2 along the axial direction of the battery cell 2 is S3, and the welding area between the current collector 1 and the battery cell 2 is S4, where 0 < S4 / S3 ≤ 100%. Optionally, the value of S4 / S3 can be any one or any two of the following: 0.01%, 1%, 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, 60%, 70%, 80%, 90%, 100%.

[0083] In one embodiment, 5% < S4 / S3 ≤ 50%. Optionally, the value of S4 / S3 can be any one or any two of 5%, 10%, 15%, 20%, 25%, 30%, 35%, 40%, 50%, etc. In this embodiment, controlling the value of S4 / S3 within the range of 5%-50% ensures the current carrying capacity between the current collector 1 and the battery cell 2 while saving welding time and welding material costs.

[0084] The embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of this application. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A current collector plate, characterized by, The connecting piece comprises at least one bending area, and a strength-reducing structure is arranged on the bending area, and the strength-reducing structure is used to reduce the strength of the bending area. The connecting piece further comprises a first connecting part and a second connecting part, the second connecting part is used to be electrically connected with the shell of the battery, the first connecting part is used to be electrically connected with the tab of the battery, and the bending area is bent and connected between the first connecting part and the second connecting part, so that the first connecting part and the second connecting part are arranged at an included angle.

2. The current plate of claim 1, wherein The strength-reducing structure comprises a hole.

3. The current plate of claim 1, wherein, The hole diameter of the hole is R, and 0 < R ≤ 10 mm.

4. The current plate of claim 3, wherein, The area of the hole is S1, the total area of the connecting piece is S0, and 2% ≤ S1 / S0 ≤ 40%.

5. The current plate according to claim 3 or 4, characterized in that The number of the holes is multiple.

6. The current plate according to claim 3 or 4, characterized in that The multiple holes are distributed at intervals.

7. The current plate of claim 6, wherein, The centroid distance between two adjacent holes is D1, and 0.5 mm ≤ D1 ≤ 62 mm.

8. The current plate of claim 6, wherein, The bending area is provided with a crease, and the multiple holes are arranged along the crease.

9. The current plate of claim 6, wherein, The multiple holes are distributed at equal intervals on the bending area.

10. The current plate of claim 6, wherein, The strength-reducing structure comprises a groove.

11. The current plate of claim 2, wherein, The groove has a bottom wall, the thickness of the bottom wall is T1, the thickness of the first connecting part or the second connecting part is T0, and 20% ≤ T1 / T0 ≤ 95%.

12. The current plate of claim 11, wherein, The groove has a bottom wall, the area of the bottom wall is S2, and the total area of the connecting piece is S0, and 2% ≤ S2 / S0 ≤ 40%.

13. The current plate according to claim 11 or 12, characterized in that 14. The current collector according to claim 11 or 12, wherein The number of the grooves is multiple. The bending area is provided with a crease, and the multiple grooves are arranged along the crease.

15. The current plate of claim 14, wherein, The multiple grooves are distributed at equal intervals on the bending area.

16. The current plate of claim 14, wherein, The strength-reducing structure comprises a hole and a groove.

17. The current plate of claim 1 or 2, wherein The included angle between the first connecting part and the second connecting part is greater than 0° and less than 180°.

18. The current plate of claim 2, wherein, The current collector further comprises a disc body, the first connecting part is integrally formed with the disc body, or the first connecting part is welded to the disc body.

19. The current plate of claim 2, wherein, The battery comprises an electric core and a current collector according to any one of claims 1 to 19.

20. A battery, characterized by 21. The battery according to claim 20, wherein The current collector comprises a disc body, the disc body comprises a first metal layer and a second metal layer connected to each other, the first metal layer is connected to the electric core, the second metal layer is located on the side of the first metal layer away from the electric core, and the materials of the first metal layer and the second metal layer are different.

22. The battery according to claim 21, wherein The material of the first metal layer is copper metal; and / or The material of the second metal layer is nickel metal; and / or The material of the connecting piece is nickel metal. The sum of the thicknesses of the first metal layer and the second metal layer is T2, the thickness of the first metal layer is T3, and 0% < T3 / T2 ≤ 99%.

23. The battery of claim 21 or 22, wherein, 40% ≤ T3 / T2 ≤ 60%.

24. The battery of claim 23, wherein, The current collector further comprises a disc body, the outer diameter of the disc body is D2, the outer diameter of the electric core is D3, and 50% ≤ D2 / D3 ≤ 150%.

25. The battery of claim 20, wherein, ​ 26. The battery of claim 25, wherein, 80%≤D2 / D3≤120%.

27. The battery of any one of claims 20 to 22, wherein, The overlapping area of the current collector and the battery cell along the axial direction of the battery cell is S3, the welding area between the current collector and the battery cell is S4, and 0 28. The battery of claim 27, wherein, 5%<S4 / S3≤50%.

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