Collector plate for power battery and power battery

Abstract

The present application discloses a collector plate for a power battery and a power battery, the power battery includes a core group and a shell for placing the core group, the full pole lugs at the same end of each core of the core group are located in the same plane, the collector plate is used to weld between the full pole lugs and the shell of each core located in the same plane, the collector plate includes a plurality of strip branches, the plurality of strip branches are sequentially connected to form a closed or open hollow area, the collector plate is configured to pass through the central through hole of each core in turn, the collector plate is formed with a shell welding area and a full pole lug welding area corresponding to each core, and a plurality of hollow grooves are formed on each strip branch of the collector plate, and by setting each hollow groove, the shell welding area and the full pole lug welding area corresponding to each core can be elastically deformed, and the adjacent welding areas corresponding to adjacent cores can be elastically deformed. The present application can not only limit the stress transfer between the full pole lug welding area and the shell welding area of ​​each core, but also limit the stress transfer between adjacent cores.

Description

Technical Field

[0001] The present application 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 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 battery structures to improve energy density. However, there are currently the following problems with cylindrical batteries on the collector plate:

[0003] (1) The current collectors commonly used in cylindrical batteries are more complex in design and use more metal materials, resulting in higher battery production costs.

[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 bottom wall of the shell 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 bottom of the shell, the winding core will directly impact the welding position during the vibration of 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 battery.

[0005] In addition, a one-shell multi-core structure has emerged, that is, multiple cores are placed in the same shell to optimize the internal compactness of the battery and increase the battery energy density. The multiple cores of the current one-shell multi-core structure are all connected to their respective collector plates, which is not conducive to rapid assembly and cost reduction. Summary of the invention

[0006] The purpose of the present application 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 objectives, the present application provides a current collecting disk for a power battery, the power battery comprising a core group formed by arranging multiple cores and a shell for placing the core group, the full pole ears at the same end of each core of the core group are located in the same plane, the current collecting disk is used to be welded between the full pole ears of each core located in the same plane and the shell, the current collecting disk comprises multiple strip branches, the multiple strip branches are connected in sequence to form a closed or open hollow area, the current collecting disk is configured to pass through the central through hole of each core in sequence, the current collecting disk is formed with a shell welding area and a full pole ear welding area corresponding to each core, and a number of hollow grooves are formed on each of the strip branches of the current collecting disk, and by setting the hollow grooves, the shell welding area and the full pole ear welding area corresponding to each core can be elastically deformed and the adjacent welding areas corresponding to adjacent cores can be elastically deformed.

[0008] Optionally, a corner area is formed between two adjacent strip branches, and the corner area forms the shell welding area corresponding to the central through hole of the winding core located at the corner, and the positions of the two adjacent strip branches close to the corner area correspond to the winding core located at the corner to form the full-ear welding area respectively.

[0009] Optionally, at least one of the strip branches connects at least three of the winding cores arranged in sequence, and the strip branch corresponds to the middle winding core to form the shell welding area corresponding to the central through hole and two full-ear welding areas located on both sides of the shell welding area along the extension direction of the strip branch.

[0010] Optionally, each of the strip-like branches connects at least two of the cores arranged in sequence, wherein every two adjacent cores are defined as a first core and a second core, and mutually close areas of the first core and the second core are defined as a first area and a second area, respectively, and the strip-like branch forms a first notch at a position corresponding to the first area, and forms a second notch at a position corresponding to the second area, the first notch and the second notch are staggered in the extension direction of the strip-like branch and one of them opens inward and the other opens outward, and an elastically deformable position is formed between the first notch and the second notch; the hollow groove includes the first notch and the second notch.

[0011] Optionally, the lengths of the first notch and the second notch in the width direction of the strip-shaped branch are 1 / 2 to 2 / 3 of the overall width of the strip-shaped branch.

[0012] Optionally, the strip-shaped branch is formed with a lateral protrusion at a side position opposite to the first notch and at a side position opposite to the second notch.

[0013] Optionally, the collecting disk is formed with the shell welding area corresponding to the central through hole and two full-ear welding areas located on both sides of the shell welding area in the extension direction of the collecting disk corresponding to each of the winding cores. The full-ear welding area is provided with a welding track, and one end of the welding track away from the shell welding area exceeds the corresponding first notch or the second notch.

[0014] Optionally, corresponding to the winding core, two spacing grooves are formed on the current collecting disk as the hollow grooves and are located on both sides of the shell welding area. The two spacing grooves are located between the two notches corresponding to the winding core. By setting the two spacing grooves and the two notches corresponding to the winding core, two connecting arms and two full-pole lug welding areas are formed, which are respectively located on both sides of the shell welding area. The connecting arms and the full-pole lug welding areas on the same side of the shell welding area are located on both sides of the current collecting disk in the width direction, wherein one end of the connecting arm extends out from the shell welding area, and the other end terminates at the corresponding notch, and the end of the connecting arm close to the notch is connected to the full-pole lug welding area, and the full-pole lug welding area forms a free end spaced apart from the shell welding area and the connecting arm, and the connection area between the connecting arm and the full-pole lug welding area can be elastically deformed.

[0015] Optionally, a corner area is formed between two adjacent strip branches, and the corner area forms the shell welding area corresponding to the central through hole of the winding core located at the corner, and the positions of the two adjacent strip branches close to the corner area correspond to the winding core located at the corner to form the full-ear welding areas respectively, and a hollow groove is provided between one of the two full-ear welding areas corresponding to the winding core at the corner and the corresponding shell welding area to enable elastic deformation between the two.

[0016] In order to achieve the above-mentioned purpose, the present application also provides a power battery, including a core group and a current collecting plate as described above, wherein the core group is formed by arranging multiple cores, and the full pole ears at the same end of each core of the core group are located in the same plane, and the current collecting plate is used to be welded between the full pole ears of each core located in the same plane and the shell.

[0017] In the present application, the current collector plate is formed with a shell welding area and a full-pole lug welding area for each core of the core group, so that one current collector plate can be welded with the full-pole lug and shell of each core, without the need to set a current collector plate for each core, thereby facilitating rapid assembly and reducing costs. Since the current collector plate is formed by connecting multiple strip-shaped branches, it can save materials. Moreover, by setting up each hollow groove, the shell welding area and the full-pole lug welding area corresponding to each core can be elastically deformed, and the adjacent welding areas corresponding to adjacent cores can also be elastically deformed. After the full-pole lug welding area is welded to the full-pole lug of the core, when the shell welding area is welded to the shell, the shell welding area and the full-pole lug welding area can be elastically deformed to release the generated stress, avoiding direct pulling of the full-pole lug welding position. When the assembled power battery causes the core to jump due to loading vibration and drives the full-pole lug welding area to jump together, the shell welding area and the full-pole lug welding area can also be elastically deformed to release the impact stress, avoiding the risk of open circuit between the shell welding area and the welding position of the shell. At the same time, since the adjacent welding areas corresponding to adjacent cores can also be elastically deformed, the present application can also limit the stress transfer between adjacent cores. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the structure of the current collecting plate of an embodiment of the present application.

[0019] Figure 2 It is a schematic diagram of the structure of the current collecting disk and the winding core group in the embodiment of the present application.

[0020] Figure 3 It is a schematic diagram of the exploded structure of the collecting plate, the winding core group and the shell of the embodiment of the present application.

[0021] Figure 4 It is a schematic diagram of the cross-sectional structure of the collecting plate, the winding core group and the shell of the embodiment of the present application.

[0022] Figure 5 It is a schematic structural diagram of a current collecting plate according to another embodiment of the present application.

[0023] Figure 6 It is a schematic structural diagram of a current collecting disk and a winding core assembly according to another embodiment of the present application. DETAILED DESCRIPTION

[0024] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application 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 present application. However, the present application 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 present application, so the present application is not limited by the specific embodiments disclosed below.

[0025] See also Figures 1 to 6 The embodiment of the present application discloses a current collecting plate 1 for a power battery, the power battery comprising a core group formed by arranging a plurality of cores 8 and a shell 9 for placing the core group, the full pole ears at the same end of each core 8 of the core group are located in the same plane, the current collecting plate 1 is used to be welded between the full pole ears and the shell 9 of each core 8 located in the same plane, the current collecting plate 1 comprises a plurality of strip branches 10, the plurality of strip branches 10 are sequentially connected to form a closed hollow area 30 or a hollow area 30 having an opening 20, the current collecting plate 1 is configured to pass through the central through hole 81 of each core 8 in sequence, the current collecting plate 1 is formed with a shell welding area 41 and a full pole ear welding area 42 corresponding to each core 8, and a plurality of hollow grooves 11 are formed on each strip branch 10 of the current collecting plate 1, by setting the hollow grooves 11, the shell welding area 41 and the full pole ear welding area 42 corresponding to each core 8 can be elastically deformed and the adjacent welding areas corresponding to adjacent cores 8 can be elastically deformed. In a specific example, the adjacent welding areas corresponding to every two adjacent winding cores 8 are all full-tab welding areas 42. Figure 1 and Figure 2In the example of , a plurality of strip-shaped branches 10 are connected end to end in sequence to form a closed hollow area 30. Figure 5 and Figure 6 In the example, a plurality of strip branches 10 are sequentially connected end to end to form a hollow area 30 having an opening 20 , that is, the first and last strip branches are not connected to each other to form an opening 20 .

[0026] It should be explained that when there is more than one full-tab welding area 42 corresponding to the winding core 8, the shell welding area 41 and the full-tab welding area 42 can be elastically deformed, and it is not limited to that the shell welding area 41 needs to be elastically deformable with each full-tab welding area 42. For example, in the example shown in the accompanying drawings, only one of the two full-tab welding areas 42 near the corner area 50 is provided with a hollow groove 11 between the shell welding area 41 in the corner area 50 to achieve elastic deformation between the two, and the other full-tab welding area 42 is not provided with a hollow groove 11 between the shell welding area 41 in the corner area 50 to ensure the required width for flow.

[0027] In the present application, the current collecting plate 1 is formed with a shell welding area 41 and a full-pole-ear welding area 42 corresponding to each winding core 8 of the winding core group, and then one current collecting plate 1 can be welded with the full-pole-ear and shell 9 of each winding core 8, and there is no need to set a current collecting plate 1 for each winding core 8, thereby facilitating rapid assembly and reducing costs. Since the current collecting plate 1 is formed by connecting a plurality of strip branches 10, it can save materials. Moreover, by setting up each hollow groove 11, the shell welding area 41 and the full-pole lug welding area 42 corresponding to each core 8 can be elastically deformed, and the adjacent welding areas corresponding to adjacent cores 8 can also be elastically deformed. Then, after the full-pole lug welding area 42 is welded to the full-pole lug of the core 8, when the shell welding area 41 is welded to the shell 9, the shell welding area 41 and the full-pole lug welding area 42 can be elastically deformed to release the generated stress, avoiding direct pulling of the full-pole lug welding position. When the assembled power battery causes the core 8 to jump due to loading vibration and drives the full-pole lug welding area 42 to jump together, the shell welding area 41 and the full-pole lug welding area 42 can also be elastically deformed to release the impact stress, avoiding the risk of open circuit at the welding position of the shell welding area 41 and the shell 9. At the same time, since the adjacent welding areas corresponding to adjacent cores 8 can also be elastically deformed, the present application can also limit the stress transfer between adjacent cores 8.

[0028] In some embodiments, a corner region 50 is formed between two adjacent shaped branches 10, and the corner region 50 forms a shell welding area 41 corresponding to the central through hole 81 of the winding core 8 located at the corner, and the positions of the two adjacent shaped branches 10 near the corner region 50 correspond to the winding core 8 located at the corner to form full-ear welding areas 42. Here, the "corner region 50" can be regarded as the common part of the two adjacent shaped branches 10. Figure 1 and Figure 2In the example of FIG. 5 , the collecting plate 1 forms a closed loop structure having three corner areas 50 . Figure 5 and Figure 6 In the example, the first and last strip branches 10 of the current collecting plate 1 are not connected together to form an opening 20 , and the current collecting plate 1 has two corner areas 50 .

[0029] In some embodiments, at least one strip-shaped branch 10 connects at least three winding cores 8 arranged in sequence, and the strip-shaped branch 10 corresponds to the middle winding core 8 to form a shell welding area 41 corresponding to the central through hole 81 and two full-ear welding areas 42 located on both sides of the shell welding area 41 along the extension direction of the strip-shaped branch 10. Here, the "middle winding core 8" refers to all winding cores 8 located between the two outermost winding cores 8. Figure 1 and Figure 2 In the example, three strip branches 10 are connected to three winding cores 8 arranged in sequence. Figure 5 and Figure 6 In the example, two of the strip branches 10 are respectively connected to three winding cores 8 arranged in sequence, and another winding core 8 is connected to two winding cores 8 arranged together.

[0030] In some embodiments, each strip branch 10 connects at least two winding cores 8 arranged in sequence, wherein each two adjacent winding cores 8 are defined as a first winding core and a second winding core, and the mutually adjacent areas of the first winding core and the second winding core are defined as a first area 82 and a second area 83, respectively. The strip branch 10 forms a first notch 12 at a position corresponding to the first area 82, and forms a second notch 13 at a position corresponding to the second area 83. The first notch 12 and the second notch 13 are staggered in the extension direction of the strip branch 10, and one of them opens inwardly and the other opens outwardly, and an elastically deformable position is formed between the first notch 12 and the second notch 13; the hollow groove 11 includes a first notch 12 and a second notch 13. Here, "opening inwardly" means opening to the hollow area 30 inside the collecting plate 1, and "opening outwardly" means opening in the opposite direction.

[0031] By setting the first notch 12 and the second notch 13 , an elastically deformable position is formed between the first notch 12 and the second notch 13 . Since elastic deformation can occur between the first notch 12 and the second notch 13 , the impact stress between adjacent winding cores 8 can be released.

[0032] Specifically, the length of the first notch 12 and the second notch 13 in the width direction of the strip-shaped branch 10 is 1 / 2 to 2 / 3 of the entire width of the strip-shaped branch 10 , but it is not limited thereto.

[0033] Specifically, the first notch 12 and the second notch 13 are straight notches extending in the width direction of the strip-shaped branch 10 , but the present invention is not limited thereto.

[0034] Specifically, the strip branch 10 is formed with a lateral convex portion 14 at one side position opposite to the first notch 12 and at one side position opposite to the second notch 13. By forming the lateral convex portion 14 at one side position opposite to the first notch 12 and at one side position opposite to the second notch 13, the corresponding position of the notch can have a sufficient width to achieve high-rate charge and discharge overcurrent. In a specific example, the lateral convex portion 14 is arc-shaped, but is not limited to this.

[0035] Specifically, the current collecting disk 1 is formed with a shell welding area 41 corresponding to the central through hole 81 and two full-ear welding areas 42 located on both sides of the shell welding area 41 in the extension direction of the current collecting disk 1 for each winding core 8, and the full-ear welding area 42 is provided with a welding track 43, and the end of the welding track 43 away from the shell welding area 41 exceeds the corresponding first notch 12 or second notch 13. Since the end of the welding track 43 away from the shell welding area 41 exceeds the corresponding first notch 12 or second notch 13, it is conducive to the welding track 43 to conduct the full-ears of each layer from the inner circle to the outer circle of the winding core 8.

[0036] Specifically, a full-tab welding area 42 can form one or more welding tracks 43 , and the welding track 43 can be in a straight line or spiral appearance, etc., which is not limited.

[0037] Specifically, corresponding to at least part of the winding core 8, two spacing grooves 15 are formed on the current collecting plate 1 as hollow grooves 11 located on both sides of the shell welding area 41, and the two spacing grooves 15 are located between the two notches corresponding to the winding core 8. By setting the two spacing grooves 15 and the two notches corresponding to the winding core 8, two connecting arms 44 and two full-polar lug welding areas 42 are formed, respectively, which are located on both sides of the shell welding area 41. The connecting arm 44 and the full-polar lug welding area 42 located on the same side of the shell welding area 41 are located on both sides of the current collecting plate 1 in the width direction, wherein one end of the connecting arm 44 extends from the shell welding area 41, and the other end is terminated at the corresponding notch, and the end of the connecting arm 44 close to the notch is connected to the full-polar lug welding area 42, and the full-polar lug welding area 42 forms a free end spaced from the shell welding area 41 and the connecting arm 44, and the connection area between the connecting arm 44 and the full-polar lug welding area 42 can be elastically deformed. Through this setting, the stress transfer between the shell welding area 41 and the full-polar lug welding area 42 of the winding core 8 can be effectively limited.

[0038] exist Figure 1 and Figure 2 In the example of , the at least part of the winding core 8 refers to the winding core 8 located at a non-corner position, and its corresponding two full-tab welding areas 42 are located at opposite sides of its shell welding area 41. Figure 5 and Figure 6 In the example, the at least part of the winding core 8 refers to the winding core 8 located at a corner and the winding core 8 located at a non-corner, and the corresponding two full-tab welding areas 42 are located at opposite sides of the shell welding area 41 thereof.

[0039] Specifically, a corner area 50 is formed between two adjacent shaped branches 10, and the corner area 50 forms a shell welding area 41 corresponding to the central through hole 81 of the winding core 8 located at the corner. The positions of the two adjacent shaped branches 10 near the corner area 50 correspond to the winding core 8 located at the corner to form full-ear welding areas 42 respectively, and a hollow groove 11 is provided between one of the two full-ear welding areas 42 corresponding to the winding core 8 at the corner and the corresponding shell welding area 41 to enable elastic deformation between the two.

[0040] In a specific example, the spacing groove 15 is L-shaped, but is not limited thereto.

[0041] In some embodiments, the multiple cores 8 of the core group are arranged in an isosceles triangle, and the collecting plate 1 is surrounded by three strip branches 10 to form a substantially triangular hollow area 30. Of course, the multiple cores 8 of the core group are not limited to being arranged in an isosceles triangle, for example, they can also be arranged in a rectangular shape, etc.

[0042] In some embodiments, the material of the current collecting plate 1 is copper, nickel, copper-nickel composite strip or aluminum. Of course, the current collecting plate 1 can also be made of other materials.

[0043] Please combine Figures 1 to 6 The present application also discloses a power battery, including a core group and a current collecting plate 1 as described above, wherein the core group is formed by arranging a plurality of cores 8, and the full pole ears at the same end of each core 8 of the core group are located in the same plane, and the current collecting plate 1 is used for welding between the full pole ears of each core 8 located in the same plane and the shell 9.

[0044] In the present application, when the power battery core 8 jumps due to the vibration of loading, etc. and causes the full-pole lug welding area 42 to jump together, elastic deformation can occur between the shell welding area 41 and the full-pole lug welding area 42 to release impact stress and avoid the risk of open circuit at the welding position of the shell welding area 41 and the shell 9. At the same time, since the adjacent welding areas corresponding to adjacent cores 8 can be elastically deformed, the present application can also limit the stress transfer between adjacent cores 8.

[0045] In order to facilitate a better understanding of the present application, the assembly process of the power battery in the example of the present application is described below.

[0046] The full-electrode lug welding areas 42 of the collector plate 1 are respectively fitted with the corresponding full-electrode lugs of each winding core 8, so that the shell welding area 41 of the collector plate 1 corresponds to the central through hole 81 of the winding core 8;

[0047] Welding each full-electrode tab welding area 42 of the current collecting plate 1 to the corresponding full-electrode tab of each winding core 8 (specifically, by laser welding);

[0048] Place the coil core assembly with the collector plate 1 welded into the housing 9, with the collector plate 1 facing the bottom of the housing 9;

[0049] A welding needle is passed through the central through hole 81 of each winding core 8 to perform resistance welding on the shell welding area 41 and the bottom of the shell 9 .

[0050] Specifically, the assembly process may further include a pre-treatment step. In the pre-treatment step, the entire tab of the winding core 8 may be flattened.

[0051] The above disclosure is only a preferred example of the present application, 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 application. Therefore, equivalent changes made according to the scope of the patent application of the present application still fall within the scope covered by the present application.

Claims

1. A current collector for a power battery, the power battery comprising a core group formed by arranging a plurality of cores and a shell for placing the core group, wherein all the tabs at the same end of each core of the core group are located in the same plane, It is characterized in that The current collecting disk is used for welding between the full-pole ears and the shell of each winding core located in the same plane. The current collecting disk includes a plurality of strip branches, and the plurality of strip branches are connected in sequence to form a closed or open hollow area. The current collecting disk is configured to pass through the central through hole of each winding core in sequence. The current collecting disk is formed with a shell welding area and a full-pole ear welding area corresponding to each winding core, and a plurality of hollow grooves are formed on each of the strip branches of the current collecting disk. By setting the hollow grooves, the shell welding area and the full-pole ear welding area corresponding to each winding core can be elastically deformed, and the adjacent welding areas corresponding to adjacent winding cores can be elastically deformed.

2. The collecting plate according to claim 1, It is characterized in that A corner area is formed between two adjacent strip branches, and the corner area forms the shell welding area corresponding to the central through hole of the winding core located at the corner. The positions of the two adjacent strip branches close to the corner area correspond to the winding core located at the corner to form the full-ear welding area respectively.

3. The collecting plate according to claim 1 or 2, It is characterized in that At least one strip-shaped branch connects at least three sequentially arranged winding cores, and the strip-shaped branch corresponds to the winding core in the middle to form the shell welding area corresponding to the central through hole and two full-ear welding areas located on both sides of the shell welding area along the extension direction of the strip-shaped branch.

4. The collecting plate according to claim 1, It is characterized in that Each of the strip-like branches connects at least two of the cores arranged in sequence, wherein every two adjacent cores are defined as a first core and a second core, and mutually adjacent areas of the first core and the second core are defined as a first area and a second area, respectively. The strip-like branch forms a first notch at a position corresponding to the first area, and forms a second notch at a position corresponding to the second area. The first notch and the second notch are staggered in the extension direction of the strip-like branch, and one of them opens inwardly and the other opens outwardly, and an elastically deformable position is formed between the first notch and the second notch; the hollow groove includes the first notch and the second notch.

5. The collecting plate according to claim 4, It is characterized in that The lengths of the first notch and the second notch in the width direction of the strip-shaped branch are 1 / 2 to 2 / 3 of the entire width of the strip-shaped branch.

6. The collecting plate according to claim 4, It is characterized in that The strip-shaped branch is formed with a lateral protrusion at a side position opposite to the first notch and at a side position opposite to the second notch.

7. The collecting plate according to claim 4, It is characterized in that The collecting disk is formed with the shell welding area corresponding to the central through hole and two full-ear welding areas located on both sides of the shell welding area in the extension direction of the collecting disk corresponding to each of the winding cores. The full-ear welding area is provided with a welding track, and one end of the welding track away from the shell welding area exceeds the corresponding first notch or the second notch.

8. The collecting plate according to claim 4, It is characterized in that Corresponding to at least part of the winding core, two spacing grooves are formed on the current collecting disk as the hollow grooves, and the two spacing grooves are located between the two notches corresponding to the winding core. By setting the two spacing grooves and the two notches corresponding to the winding core, two connecting arms and two full-pole lug welding areas are formed, which are respectively located on both sides of the shell welding area. The connecting arms and the full-pole lug welding areas on the same side of the shell welding area are located on both sides of the current collecting disk in the width direction, wherein one end of the connecting arm extends out from the shell welding area, and the other end terminates at the corresponding notch, and the end of the connecting arm close to the notch is connected to the full-pole lug welding area, and the full-pole lug welding area forms a free end spaced apart from the shell welding area and the connecting arm, and the connection area between the connecting arm and the full-pole lug welding area can be elastically deformed.

9. The collecting plate according to claim 4, It is characterized in that A corner area is formed between two adjacent strip branches, and the corner area forms the shell welding area corresponding to the central through hole of the winding core located at the corner. The positions of the two adjacent strip branches close to the corner area correspond to the winding core located at the corner to form the full-ear welding areas respectively. A hollow groove is provided between one of the two full-ear welding areas corresponding to the winding core at the corner and the corresponding shell welding area to enable elastic deformation between the two.

10. A power battery, It is characterized in that It comprises a core group and a current collecting disk as claimed in any one of claims 1 to 9, wherein the core group is formed by arranging a plurality of cores, the full pole ears at the same end of each core of the core group are located in the same plane, and the current collecting disk is used for welding between the full pole ears of each core located in the same plane and the shell.

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