Collector plate for power battery and power battery

Abstract

The utility model provides a current collector plate for power battery and power battery, current collector plate includes main part, extension part and bending part, the extension part faces the main part and is connected to the edge of main part through the bending part, and the main part face back to the extension part is configured to be welded with the full tab of roll core. One surface, back to the main body part, of the extension part is configured to be welded with the shell bottom, and the bending part can be elastically deformed. After the main body part is welded with the full tab of the roll core and the extension part is welded with the shell bottom, the bending part can generate elastic deformation to release the generated stress, so that the phenomenon that the welding position of the main body part and the full tab is directly pulled is avoided, and in addition, when the roll core jumps and the main body part jumps together due to loading vibration and the like of the assembled power battery, the power battery is prevented from being damaged. And the bending part can also generate elastic deformation to release impact stress, so that the risk of open circuit at the welding position of the extension part and the shell bottom is reduced, and the anti-seismic property of the power battery is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of power batteries, and in particular to a current collecting plate for a power battery and a power battery. Background Art

[0002] At present, lithium-ion / sodium-ion cylindrical power batteries have gradually become mainstream products in the new energy industry due to their high energy density, good capacity consistency, and ability to support high-rate charge and discharge. More and more manufacturers continue to pursue the compactness optimization of cylindrical power battery structures to improve energy density. However, there are currently the following problems with cylindrical power batteries on the collector plate:

[0003] (1) The current collectors commonly used in cylindrical power batteries are more complex in design and use more metal materials, which leads to higher production costs for cylindrical power batteries.

[0004] (2) For the newly emerging current collector with a simple strip structure, when it is first laser welded to the full-pole ear of the winding core and then the middle part of the current collector is welded to the shell bottom by resistance welding, the full-pole ear welding position will be pulled. In addition, due to the rigid connection between the full-pole ear and the current collector, and between the current collector and the shell bottom, the winding core will directly impact the welding position during the vibration during loading (the larger winding core inside will jump), which is easy to fall off, resulting in the risk of open circuit failure of the cylindrical power battery.

[0005] (3) When resistance welding is performed on the collector plate and the shell bottom, if a pure nickel collector plate is used, it is expensive and has a high resistance (resulting in a large current temperature rise, bringing safety risks). If a pure copper collector plate or a copper-nickel composite belt collector plate is used, the copper surface facing up in contact with the welding needle cannot avoid the problem of needle sticking. Utility Model Content

[0006] The purpose of the utility model is to provide a current collecting plate for a power battery and a power battery, which can solve at least one technical problem mentioned in the background technology.

[0007] In order to achieve the above-mentioned purpose, the utility model provides a current collecting plate for a power battery, comprising a main body, an extension portion and a bending portion, the extension portion faces the main body and is connected to the edge of the main body through the bending portion, the side of the main body facing away from the extension portion is configured to be welded to the full pole ear of the winding core, the side of the extension portion facing away from the main body is configured to be welded to the bottom of the shell, and the bending portion is elastically deformable.

[0008] The current collecting disk of the utility model is formed with an extension portion facing the main body, and the extension portion and the main body are connected by an elastically deformable bending portion. After the main body is welded to the full-pole ear of the winding core, when the extension is welded to the bottom of the shell, the bending portion can be elastically deformed to release the generated stress, thereby avoiding direct pulling of the welding position between the main body and the full-pole ear. In addition, when the winding core of the power battery after assembly jumps due to the vibration of loading and the like and drives the main body to jump together, the bending portion can also be elastically deformed to release the impact stress, thereby reducing the risk of open circuit at the welding position of the extension portion and the bottom of the shell, thereby improving the seismic performance of the power battery.

[0009] Optionally, the bending portion is U-shaped.

[0010] Optionally, a through hole is formed on the main body, the through hole is configured to correspond to the through hole of the winding core for the soldering pin to pass through, and the extension portion faces the through hole.

[0011] Optionally, the main body is strip-shaped, the through hole is located in the middle of the main body in the length direction, the main body has ear welding areas formed on both sides of the through hole in the length direction, and the bending portion extends from an edge of the main body in the width direction.

[0012] Optionally, both sides of the extension portion in the length direction of the main body portion extend beyond the through hole, and a projection of the extension portion on the main body portion completely covers the through hole.

[0013] Optionally, the collecting plate is formed by bending a sheet of copper-nickel composite material, the side of the main body facing away from the extension part is a copper layer, and the side facing the extension part is a nickel layer, the side of the extension part facing away from the main body is a copper layer, and the side facing the main body is a nickel layer.

[0014] Optionally, the collecting plate is formed by bending a sheet of aluminum-nickel composite material, the side of the main body facing away from the extension part is an aluminum layer, and the side facing the extension part is a nickel layer, the side of the extension part facing away from the main body is an aluminum layer, and the side facing the main body is a nickel layer.

[0015] Optionally, the extension portion and the main body portion are spaced apart.

[0016] In order to achieve the above-mentioned purpose, the utility model provides a current collecting plate for a power battery, comprising a main body, an extension and a bending portion, the extension facing the main body and connected to the edge of the main body through the bending portion, the side of the main body facing away from the extension is configured to be welded to the full pole ear of the winding core, the side of the extension facing away from the main body is configured to be welded to the bottom of the shell, a position of the extension close to the bending portion is attached to the main body and welded and fixed, and the extension is elastically deformable.

[0017] The current collecting plate of the utility model is formed with an extension portion facing the main body, the extension portion and the main body are connected by a bending portion, a position of the extension portion close to the bending portion is attached to the main body and welded and fixed, the extension portion can be elastically deformed, and then after the main body is welded to the full pole ear of the winding core, when the extension portion is welded to the shell bottom, the extension portion can be elastically deformed to release the generated stress, thereby avoiding direct pulling of the welding position between the main body and the full pole ear.

[0018] Optionally, a through hole is formed on the main body, the through hole is configured to correspond to the through hole of the winding core for the soldering pin to pass through, and the extension portion faces the through hole.

[0019] Optionally, the collecting plate is formed by bending a sheet of copper-nickel composite material, the side of the main body facing away from the extension portion is a copper layer, and the side facing the extension portion is a nickel layer, and the side of the extension portion facing away from the main body portion is a copper layer, and the side facing the main body portion is a nickel layer; or

[0020] The collecting plate is formed by bending a sheet of aluminum-nickel composite material, the side of the main body facing away from the extension part is an aluminum layer, and the side facing the extension part is a nickel layer, the side of the extension part facing away from the main body is an aluminum layer, and the side facing the main body is a nickel layer.

[0021] In order to achieve the above-mentioned purpose, the utility model also provides a power battery, including a winding core, a shell and a current collecting plate as described above, wherein the winding core is sleeved in the shell, the current collecting plate is welded between the full pole ear of the winding core and the shell bottom of the shell, the main body is welded to the full pole ear of the winding core, and the extension part is welded to the shell bottom of the shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a three-dimensional structural schematic diagram of the current collecting plate of the embodiment of the utility model.

[0023] Figure 2 It is a three-dimensional structural schematic diagram of the current collecting plate of the embodiment of the utility model from another perspective.

[0024] Figure 3 It is a schematic diagram of the exploded structure of the current collecting plate of the embodiment of the utility model.

[0025] Figure 4 It is a three-dimensional structural schematic diagram of the current collecting disk assembled to the winding core according to an embodiment of the utility model.

[0026] Figure 5 It is a three-dimensional structural schematic diagram of another perspective of the current collecting plate of the embodiment of the utility model being assembled to the winding core.

[0027] Figure 6It is a schematic diagram of the cross-sectional structure of the power battery of the embodiment of the utility model.

[0028] Figure 7 It is a three-dimensional structural schematic diagram of a current collecting plate according to another embodiment of the utility model.

[0029] Figures 8 to 10 It is a structural schematic diagram of the main body and the extension part of the current collecting plate of the embodiment of the utility model being fixed by laser welding or ultrasonic welding. DETAILED DESCRIPTION

[0030] In order to explain the technical content, structural features and achieved effects of the present invention in detail, the following is a detailed description in conjunction with the implementation modes and the accompanying drawings.

[0031] In order to make the above-mentioned purposes, features and advantages of the utility model more obvious and easy to understand, the specific implementation methods of the utility model are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the utility model, so the utility model is not limited by the specific embodiments disclosed below.

[0032] Embodiment 1

[0033] See also Figures 1 to 6 The utility model discloses a current collecting plate 1 for a power battery, comprising a main body 10, an extension portion 20 and a bending portion 30, wherein the extension portion 20 faces the main body 10 and is connected to the edge of the main body 10 through the bending portion 30, and the side of the main body 10 facing away from the extension portion 20 is configured to be welded to the full pole ear of the winding core 4, and the side of the extension portion 20 facing away from the main body 10 is configured to be welded to the shell bottom 51, and the bending portion 30 can be elastically deformed.

[0034] The current collecting plate 1 of the utility model is formed with an extension portion 20 facing the main body 10, and the extension portion 20 and the main body 10 are connected by an elastically deformable bending portion 30. After the main body 10 is welded to the full-pole ear of the winding core 4, when the extension portion 20 is welded to the shell bottom 51, the bending portion 30 can be elastically deformed to release the generated stress, thereby avoiding direct pulling of the welding position between the main body 10 and the full-pole ear. In addition, when the winding core 4 of the assembled power battery jumps due to the vibration of loading and the like and drives the main body 10 to jump together, the bending portion 30 can also be elastically deformed to release the impact stress, thereby reducing the risk of open circuit at the welding position of the extension portion 20 and the shell bottom 51, thereby improving the seismic performance of the power battery.

[0035] In some embodiments, the bending portion 30 is U-shaped, but it is not limited to this, as long as it can play the role of elastic deformation. In addition, the U-shape here should not be understood in a narrow sense, such as the two arms of the U-shaped structure must be parallel. Various U-shaped structures should belong to the U-shape referred to in this application, such as arc shape, parabola shape, etc. For example, Figure 3 and Figure 7 Two types of U-shaped bending portions 30 are provided, wherein Figure 7 The middle bending portion 30 is in an arc shape. In this example, the bending portion 30 has a better effect of preventing tip discharge.

[0036] In some embodiments, the extension portion 20 is parallel to the main body 10. However, this is not a limitation. It should be explained that the extension portion 20 and the main body 10 are parallel when they are naturally parallel.

[0037] In some embodiments, the extension portion 20 and the main body 10 are spaced apart. However, this is not limited thereto. For example, Figure 7 In the collecting plate 1, the extension part 20 is fitted with the main body 10. It should be noted that here, the extension part 20 and the main body 10 are not limited to being fitted as a whole, but can also be partially fitted.

[0038] In some embodiments, a through hole 11 is formed on the main body 10, and the through hole 11 is configured to correspond to the core through hole 41 for the welding needle to pass through, and the extension 20 faces the through hole 11. Since the main body 10 is provided with a through hole 11 corresponding to the core through hole 41, and the extension 20 faces the through hole 11, when the collector plate 1 and the full pole ear of the core 4 are welded and assembled into the shell 5, the welding needle can be used to pass through the core through hole 41 and the through hole 11 to perform resistance welding on the extension 20 and the shell bottom 51. It can be understood that the extension 20 and the shell bottom 51 are not limited to being welded by resistance welding.

[0039] Specifically, the diameter of the through hole 11 is greater than the diameter of the winding core through hole 41 .

[0040] Specifically, the main body 10 is strip-shaped, the through hole 11 is located in the middle of the main body 10 in the length direction, the main body 10 is formed with a tab welding area 12 for welding with the full tab of the winding core 4 on both sides of the through hole 11 in the length direction, and the bent portion 30 extends from an edge in the width direction of the main body 10. Since the main body 10 is strip-shaped, the material used can be significantly reduced compared to the commonly used complex structure of the collector 1, which is more conducive to reducing the production cost.

[0041] Furthermore, both sides of the extension part 20 in the length direction of the main body 10 exceed the through hole 11, and the projection of the extension part 20 on the main body 10 completely covers the through hole 11, which is conducive to reliable resistance welding. Of course, it is not limited to this.

[0042] Furthermore, the tab welding area 12 forms at least one welding track 13, and the welding track 13 is used to conduct at least part of the entire tab from the inner circle to the outer circle of the winding core 4. The welding track 13 can be in a straight line or spiral appearance, etc., which is not limited.

[0043] Specifically, the collector plate 1 is formed by bending a sheet of copper-nickel composite material. The so-called copper-nickel composite material sheet is a sheet formed by superimposing a copper layer and a nickel layer. After the collector plate 1 is formed by bending, the side of the main body 10 facing away from the extension part 20 is a copper layer, and the side facing the extension part 20 is a nickel layer. The side of the extension part 20 facing away from the main body 10 is a copper layer, and the side facing the main body 10 is a nickel layer. Since the side of the main body 10 facing away from the extension part 20 is a copper layer, it is convenient to weld with the full pole ear of the winding core 4 (specifically laser welding), and the side of the extension part 20 facing away from the main body 10 is a copper layer, which is convenient for welding with the shell bottom 51, and the problem of high resistance between the nickel layer and the shell bottom 51 can be solved. The side of the extension part 20 facing the main body 10 is a nickel layer, and then when the extension part 20 and the shell bottom 51 are resistance welded by using a welding needle, the occurrence of the needle sticking problem can be avoided. Further, the shell 5 is a steel shell.

[0044] Specifically, the collector plate 1 is formed by bending a sheet of aluminum-nickel composite material, and the so-called aluminum-nickel composite material sheet is a sheet formed by superimposing an aluminum layer and a nickel layer. After the collector plate 1 is formed by bending, the side of the main body 10 facing away from the extension part 20 is an aluminum layer, and the side facing the extension part 20 is a nickel layer. The side of the extension part 20 facing away from the main body 10 is an aluminum layer, and the side facing the main body 10 is a nickel layer. Since the side of the main body 10 facing away from the extension part 20 is an aluminum layer, it is convenient to weld with the full pole ear of the winding core 4 (specifically laser welding), and the side of the extension part 20 facing away from the main body 10 is an aluminum layer, which is convenient to weld with the shell bottom 51, which can solve the problem of high resistance of the nickel layer and the shell bottom 51. The side of the extension part 20 facing the main body 10 is a nickel layer, and then when the extension part 20 and the shell bottom 51 are resistance welded by using a welding needle, the occurrence of the needle sticking problem can be avoided. Further, the shell 5 is an aluminum shell.

[0045] Specifically, the collecting plate 1 can be formed by bending the sheet material before the material is received.

[0046] Embodiment 2

[0047] Please combine Figures 1 to 6The utility model also discloses a power battery, including a winding core 4, a shell 5 and a current collecting plate 1 as described in the first embodiment, wherein the winding core 4 is sleeved in the shell 5, and the current collecting plate 1 is welded between the full pole ear of the winding core 4 and the shell bottom 51 of the shell 5, wherein the main body 10 is welded to the full pole ear of the winding core 4, and the extension part 20 is welded to the shell bottom 51 of the shell 5.

[0048] The current collecting plate 1 of the power battery of the utility model is formed with an extension portion 20 facing the main body 10 by bending, and the extension portion 20 and the main body 10 are connected by an elastically deformable bending portion 30. Therefore, when the winding core 4 of the assembled power battery jumps due to the vibration of loading and the like and drives the main body 10 to jump together, the bending portion 30 can be elastically deformed to release the impact stress, thereby reducing the risk of open circuit at the welding position of the extension portion 20 and the shell bottom 51, and improving the anti-seismic performance of the power battery.

[0049] Embodiment 3

[0050] See also Figures 6 to 10 The utility model discloses a current collecting plate 1 for a power battery, comprising a main body 10, an extension 20 and a bending portion 30, wherein the extension 20 faces the main body 10 and is connected to the edge of the main body 10 through the bending portion 30, and the side of the main body 10 facing away from the extension 20 is configured to be welded to the full-pole ear of the winding core 4, and the side of the extension 20 facing away from the main body 10 is configured to be welded to the shell bottom 51, and a position of the extension 20 close to the bending portion 30 is attached to the main body 10 and fixed by welding, and the extension 20 can be elastically deformed.

[0051] It should be explained that the extension portion 20 is attached to the main body 10 at a position close to the bent portion 30 and is welded and fixed, which does not mean that only this position is attached to the main body 10. The extension portion 20 and the main body 10 can be attached as a whole (such as Figure 7 ), or they may be partially matched.

[0052] The above-mentioned collecting plate is formed with an extension portion 20 facing the main body 10, and the extension portion 20 and the main body 10 are connected by a bending portion 30. A position of the extension portion 20 close to the bending portion 30 is attached to the main body 10 and welded and fixed. The extension portion 20 can be elastically deformed. After the main body 10 is welded to the full pole ear of the winding core, when the extension portion 20 is welded to the bottom of the shell, the extension portion 20 can be elastically deformed to release the generated stress, thereby avoiding direct pulling of the welding position between the main body 10 and the full pole ear.

[0053] Please combine Figures 8 to 10 The extension portion 20 may be welded and fixed to the main body 10 at a position close to the bending portion 30 by laser welding, ultrasonic welding, or other methods.

[0054] In some embodiments, a through hole 11 is formed on the main body 10, and the through hole 11 is configured to correspond to the core through hole 41 for the welding needle to pass through, and the extension 20 faces the through hole 11. Since the main body 10 is provided with a through hole 11 corresponding to the core through hole 41, and the extension 20 faces the through hole 11, when the collector plate 1 and the full pole ear of the core 4 are welded and assembled into the shell 5, the welding needle can be used to pass through the core through hole 41 and the through hole 11 to perform resistance welding on the extension 20 and the shell bottom 51. It can be understood that the extension 20 and the shell bottom 51 are not limited to being welded by resistance welding.

[0055] Specifically, the diameter of the through hole 11 is greater than the diameter of the winding core through hole 41 .

[0056] Specifically, the main body 10 is strip-shaped, the through hole 11 is located in the middle of the main body 10 in the length direction, the main body 10 is formed with a tab welding area 12 for welding with the full tab of the winding core 4 on both sides of the through hole 11 in the length direction, and the bent portion 30 extends from an edge in the width direction of the main body 10. Since the main body 10 is strip-shaped, the material used can be significantly reduced compared to the commonly used complex structure of the collector 1, which is more conducive to reducing the production cost.

[0057] Furthermore, both sides of the extension part 20 in the length direction of the main body 10 exceed the through hole 11, and the projection of the extension part 20 on the main body 10 completely covers the through hole 11, which is conducive to reliable resistance welding. Of course, it is not limited to this.

[0058] Specifically, the collector plate 1 is formed by bending a sheet of copper-nickel composite material. The so-called copper-nickel composite material sheet is a sheet formed by superimposing a copper layer and a nickel layer. After the collector plate 1 is formed by bending, the side of the main body 10 facing away from the extension part 20 is a copper layer, and the side facing the extension part 20 is a nickel layer. The side of the extension part 20 facing away from the main body 10 is a copper layer, and the side facing the main body 10 is a nickel layer. Since the side of the main body 10 facing away from the extension part 20 is a copper layer, it is convenient to weld with the full pole ear of the winding core 4 (specifically laser welding), and the side of the extension part 20 facing away from the main body 10 is a copper layer, which is convenient for welding with the shell bottom 51, and the problem of high resistance between the nickel layer and the shell bottom 51 can be solved. The side of the extension part 20 facing the main body 10 is a nickel layer, and then when the extension part 20 and the shell bottom 51 are resistance welded by using a welding needle, the occurrence of the needle sticking problem can be avoided. Further, the shell 5 is a steel shell.

[0059] Specifically, the collector plate 1 is formed by bending a sheet of aluminum-nickel composite material, and the so-called aluminum-nickel composite material sheet is a sheet formed by superimposing an aluminum layer and a nickel layer. After the collector plate 1 is formed by bending, the side of the main body 10 facing away from the extension part 20 is an aluminum layer, and the side facing the extension part 20 is a nickel layer. The side of the extension part 20 facing away from the main body 10 is an aluminum layer, and the side facing the main body 10 is a nickel layer. Since the side of the main body 10 facing away from the extension part 20 is an aluminum layer, it is convenient to weld with the full pole ear of the winding core 4 (specifically laser welding), and the side of the extension part 20 facing away from the main body 10 is an aluminum layer, which is convenient to weld with the shell bottom 51, which can solve the problem of high resistance of the nickel layer and the shell bottom 51. The side of the extension part 20 facing the main body 10 is a nickel layer, and then when the extension part 20 and the shell bottom 51 are resistance welded by using a welding needle, the occurrence of the needle sticking problem can be avoided. Further, the shell 5 is an aluminum shell.

[0060] Specifically, the collecting plate 1 can be formed by bending the sheet material before the material is received.

[0061] Embodiment 4

[0062] Please combine Figures 6 to 10 The utility model also discloses a power battery, including a winding core 4, a shell 5 and a current collecting plate 1 as described in the third embodiment, wherein the winding core 4 is sleeved in the shell 5, and the current collecting plate 1 is welded between the full pole ear of the winding core 4 and the shell bottom 51 of the shell 5, wherein the main body 10 is welded to the full pole ear of the winding core 4, and the extension part 20 is welded to the shell bottom 51 of the shell 5.

[0063] The current collecting plate 1 of the power battery of the present invention is formed with an extension portion 20 facing the main body 10, and the extension portion 20 and the main body 10 are connected by a bending portion 30. A position of the extension portion 20 close to the bending portion 30 is attached to the main body 10 and welded and fixed. The extension portion 20 can be elastically deformed. After the main body 10 is welded to the full pole ear of the winding core, when the extension portion 20 is welded to the bottom of the shell, the extension portion 20 can be elastically deformed to release the generated stress, thereby avoiding direct pulling of the welding position of the main body 10 and the full pole ear, and ensuring a reliable connection between the main body 10 and the full pole ear.

[0064] The utility model also discloses a method for assembling a power battery as described in the second embodiment and the fourth embodiment, comprising:

[0065] The main body 10 of the current collecting plate 1 is fitted with the full pole ear of the winding core 4, so that the through hole 11 of the current collecting plate 1 corresponds to the winding core through hole 41 of the winding core 4;

[0066] Welding the main body 10 of the current collecting plate 1 to the full pole lug of the winding core 4;

[0067] Place the winding core 4 into the housing 5 so that the extension portion 20 faces the housing bottom 51;

[0068] After the welding needle is passed through the winding core through hole 41 and the through hole 11 in sequence, the extension portion 20 and the shell bottom 51 are resistance welded.

[0069] After the main body 10 is welded to the full tab of the winding core 4 , when the extension portion 20 is welded to the shell bottom 51 , the bent portion 30 can be elastically deformed to release the stress generated thereby, thereby avoiding direct pulling of the welding position between the main body 10 and the full tab.

[0070] Specifically, the assembly method may further include a pre-processing step. In the pre-processing step, the entire tab of the winding core 4 may be flattened / flattened before the aforementioned steps are performed.

[0071] The above disclosure is only a preferred example of the present invention, and its role is to facilitate the technical personnel in this field to understand and implement it. Of course, it 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 current collecting plate for a power battery, characterized in that: It includes a main body, an extension and a bending part, the extension part faces the main body and is connected to the edge of the main body through the bending part, the side of the main body facing away from the extension part is configured to be welded to the full pole ear of the winding core, the side of the extension part facing away from the main body is configured to be welded to the bottom of the shell, and the bending part is elastically deformable.

2. The collecting plate according to claim 1, characterized in that: The bent portion is U-shaped.

3. The collecting plate according to claim 1, characterized in that: A through hole is formed on the main body, and the through hole is configured to correspond to the winding core through hole for the soldering pin to pass through, and the extending portion faces the through hole.

4. The collecting plate according to claim 3, characterized in that: The main body is strip-shaped, the through hole is located in the middle of the main body in the length direction, the main body is formed with tab welding areas on both sides of the through hole in the length direction, and the bent portion extends from an edge of the main body in the width direction.

5. The collecting plate according to claim 4, characterized in that: Both sides of the extension portion in the length direction of the main body portion extend beyond the through hole, and a projection of the extension portion on the main body portion completely covers the through hole.

6. The collecting plate according to claim 3, characterized in that: The collecting plate is formed by bending a sheet of copper-nickel composite material, the side of the main body facing away from the extension is a copper layer, and the side facing the extension is a nickel layer, the side of the extension facing away from the main body is a copper layer, and the side facing the main body is a nickel layer; or The collecting plate is formed by bending a sheet of aluminum-nickel composite material, the side of the main body facing away from the extension part is an aluminum layer, and the side facing the extension part is a nickel layer, the side of the extension part facing away from the main body is an aluminum layer, and the side facing the main body is a nickel layer.

7. The collecting plate according to claim 1, characterized in that: The extension portion and the main body portion are spaced apart or at least partially fitted together.

8. A current collecting plate for a power battery, characterized in that: It includes a main body, an extension part and a bending part, the extension part faces the main body and is connected to the edge of the main body through the bending part, the side of the main body facing away from the extension part is configured to be welded to the full pole ear of the winding core, and the side of the extension part facing away from the main body is configured to be welded to the bottom of the shell, a position of the extension part close to the bending part is attached to the main body and welded and fixed, and the extension part is elastically deformable.

9. The collecting plate according to claim 8, characterized in that: A through hole is formed on the main body, and the through hole is configured to correspond to the winding core through hole for the soldering pin to pass through, and the extending portion faces the through hole.

10. The collecting plate according to claim 9, characterized in that: The collecting plate is formed by bending a sheet of copper-nickel composite material, the side of the main body facing away from the extension is a copper layer, and the side facing the extension is a nickel layer, the side of the extension facing away from the main body is a copper layer, and the side facing the main body is a nickel layer; or The collecting plate is formed by bending a sheet of aluminum-nickel composite material, the side of the main body facing away from the extension part is an aluminum layer, and the side facing the extension part is a nickel layer, the side of the extension part facing away from the main body is an aluminum layer, and the side facing the main body is a nickel layer.

11. A power battery, characterized in that: It comprises a winding core, a shell and a current collecting disk as described in any one of claims 1 to 10, wherein the winding core is sleeved in the shell, the current collecting disk is welded between the full pole ear of the winding core and the shell bottom of the shell, the main body is welded to the full pole ear of the winding core, and the extension part is welded to the shell bottom of the shell.

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