Collecting plate and battery

Abstract

The invention discloses a current collecting plate and a battery, the current collecting plate comprises a body part, the body part is provided with a through hole, and the through hole is arranged on the outer side of the axis of the body part; the protruding part is arranged on one surface of the body part in a protruding mode, and the protruding part is located on the circumferential edge of the through hole. The battery comprises a battery cell, tab parts and a collector plate, the tab parts are arranged at the two axial ends of the battery cell, and the surfaces, back on to the battery cell, of the tab parts are welded to a body part of the collector plate; tabs are convexly arranged on the tab parts opposite to the battery cell, correspond to the convex parts, penetrate through the through holes and are welded with the convex parts in an attached manner. According to the invention, the effective welding area of the collector plate and the tab can be increased, so that the overcurrent capability of the battery is improved, and the internal resistance of the battery is reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a current collecting plate and a battery. Background Art

[0002] As the size and capacity of cylindrical batteries continue to increase, the traditional way of leading out the pole ears can no longer meet the overcurrent requirements of large cylindrical batteries. At present, in order to meet the overcurrent capacity of the battery cell and improve the rate performance of the cylindrical battery, the battery cells of cylindrical batteries mostly adopt a full-pole ear flattening design, specifically: after the battery cell is completed, the positive and negative pole ears at both ends of the battery cell are flattened, and then the pole ears at both ends of the battery cell are welded to the positive collector plate and the negative collector plate respectively, and finally the battery cell is packaged into a shell to form a battery. For example, the patent with publication number CN114361555A discloses a method for flattening a cylindrical battery with full pole ears, which is to blend the originally upright pole ears so that each pole ear is in contact to the maximum extent to play a better current collection role, and the full pole ears are directly led out of the battery, which can effectively reduce the internal resistance of the battery. At the same time, the full pole ears are flattened in the same plane, which is convenient for subsequent current collector plate welding and ensures the current conduction effect.

[0003] However, the prior art generally flattens the entire pole ear and welds it to the current collecting plate through laser intermittent spot welding and / or laser continuous line welding. These two welding methods result in a smaller effective welding area between the current collecting plate and the pole ear, resulting in poor current carrying capacity of the battery and higher internal resistance of the battery. Summary of the invention

[0004] In order to solve the above-mentioned defects in the prior art, the purpose of the present application is to provide a current collecting plate and a battery to increase the effective welding area between the current collecting plate and the pole ear, thereby improving the current carrying capacity of the battery and reducing the internal resistance of the battery.

[0005] A first aspect of the present application provides a current collecting plate, comprising:

[0006] A main body, wherein the main body is provided with a through hole, and the through hole is arranged outside the axis of the main body;

[0007] The protrusion is protruding from a surface of the main body and is located at the circumferential edge of the through hole.

[0008] As a preferred embodiment, in the first aspect of the present application, the main body includes an inner zone and an outer zone that are coaxially arranged, the outer zone surrounds the circumference of the inner zone, and a through hole is formed between the outer zone and the inner zone, and the protrusion is arranged on the circumferential edge of the inner zone.

[0009] As a preferred embodiment, in the first aspect of the present application, the protruding portion is obtained by punching and folding the main body portion or punching, cutting and folding the main body portion, and forms an inner area, an outer area and a through hole.

[0010] As a preferred embodiment, in the first aspect of the present application, two protrusions are provided, the two protrusions are protruding from the same surface of the main body, and the two protrusions are both located at the circumferential edge of the through hole.

[0011] As a preferred embodiment, in the first aspect of the present application, the two protrusions are both located at the radial inner arc edge of the through hole, and the two protrusions are radially symmetrically arranged.

[0012] As a preferred embodiment, in the first aspect of the present application, the two protrusions are arranged at an interval, and a gap is provided between the two protrusions, and the gap is connected with the through hole to form an integrated structure.

[0013] As a preferred embodiment, in the first aspect of the present application, the degree of the center angle corresponding to the notch is 30°-60°, and the degree of the center angle corresponding to the protrusion is 75°-105°.

[0014] As a preferred embodiment, in the first aspect of the present application, a connecting piece is provided on the circumferential edge of the main body, and the connecting piece can be bent away from the main body relative to a surface of the main body so that the protrusion is located between the connecting piece and the main body.

[0015] As a preferred embodiment, in the first aspect of the present application, the central angle corresponding to the inner zone is 360°, and the central angle corresponding to the outer zone is 210°-240°, so as to form an opening on the circumferential side of the inner zone, and a connecting piece is arranged at the opening and connected to the inner zone and the outer zone.

[0016] A second aspect of the present application provides a battery, comprising: a battery cell, a pole ear portion and the above-mentioned current collecting plate, wherein the pole ear portion is arranged at both axial ends of the battery cell, and a surface of the pole ear portion facing away from the battery cell is welded to the main body of the current collecting plate;

[0017] A pole ear is protruded on the pole ear portion facing away from the battery cell, the pole ear is arranged corresponding to the protruding portion, the pole ear passes through the through hole and is welded to the protruding portion.

[0018] As a preferred embodiment, in the second aspect of the present application, the tab is bent to form an "n"-shaped structure, and the tab is attached to two opposite surfaces of the protrusion.

[0019] As a preferred embodiment, in the second aspect of the present application, the main body portion and the pole ear portion are connected by spot welding or line welding, and the pole ear and the protruding portion are connected by contact welding.

[0020] As a preferred embodiment, in the second aspect of the present application, two pole tabs are provided, the number of protrusions is equal to the number of pole tabs and the positions correspond one to one, and both pole tabs pass through the through holes and are welded to the corresponding two protrusions.

[0021] As a preferred implementation, in the second aspect of the present application, the two pole tabs are spaced apart and radially symmetrical.

[0022] The current collecting plate and battery provided by the present application have the following technical effects:

[0023] The main body of the current collector is provided with a through hole, and a protrusion is provided on a surface of the main body relative to the circumferential edge of the through hole. When the current collector is applied to the battery, the current collector is correspondingly arranged on the side of the pole ear away from the battery cell, and the main body of the current collector is welded to the pole ear, and the pole ear can pass through the through hole to be welded with the protrusion. In this way, based on the welding of the main body and the pole ear of the current collector in the prior art, the present application utilizes the welding of the pole ear and the protrusion, which greatly increases the effective welding area between the current collector and the pole ear, thereby improving the current carrying capacity of the battery and reducing the internal resistance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the structure of the battery of this application;

[0025] Figure 2 A top view of the battery of the present application;

[0026] Figure 3 A front view of the battery of the present application;

[0027] Figure 4 An exploded view of the battery of the present application;

[0028] Figure 5 A top view of the current collector of the present application;

[0029] Figure 6 A process flow chart of welding the tab and the protrusion of the present application;

[0030] Figure 7 This is a schematic diagram of the structure of the welding of the pole ear and the current collecting plate of the present application.

[0031] Reference numerals:

[0032] 1. Current collecting plate; 11. Main body; 111. Internal area; 112. External area; 113. Center hole; 12. Through hole; 13. Protrusion; 14. Notch; 15. Connecting piece; 2. Battery cell; 3. Pole ear; 31. Pole ear; 311. Pole ear unit; 32. Through hole. DETAILED DESCRIPTION

[0033] For better understanding and implementation, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application.

[0034] In the description of the present application, it should be noted that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application belongs. The terms used herein in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application.

[0036] Example 1

[0037] See also Figure 4 and Figure 5 The present embodiment provides a current collecting plate, including a main body 11 and a protruding portion 13. The main body 11 is provided with a through hole 12, and the through hole 12 is arranged outside the axis of the main body 11. The protruding portion 13 is protruded on a surface of the main body 11, and the protruding portion 13 is located at the circumferential edge of the through hole 12.

[0038] This embodiment is described by taking a circular collector plate as an example. Of course, in actual applications, the collector plate can also be square or other shapes, and only the structure needs to be adaptively adjusted. The collector plate is applied to cylindrical batteries. Therefore, the main body of the collector plate, that is, the main body 11, is a circular structure. The main body 11 is used to correspond to the pole ear end of the battery cell 2. The main body 11 has two opposite surfaces. One surface of the main body 11 is used for the protrusion 13 to protrude and extend, and the other surface of the main body 11 is used to face the pole ear end of the battery cell 2 to facilitate welding connection with the pole ear end. The through hole 12 penetrates the two opposite surfaces of the main body 11 to facilitate the pole ear 31 at the pole ear end to pass through the through hole 12. The protrusion 13 is located at the circumferential edge of the through hole 12, so that after the pole ear 31 passes through the through hole 12, the side of the pole ear 31 can fit tightly with the side of the protrusion 13 to facilitate the fitting welding between the pole ear 31 and the protrusion 13.

[0039] It should be noted that the through hole 12 can be an arc-shaped structure, a square structure, a triangular structure, an irregular structure, etc., and its circumferential edge includes any position of the entire periphery of the through hole 12. Figure 5 Taking the arc structure as an example, the circumferential edge can be the outer arc circle, the inner arc circle of the through hole 12, or the radial edge for connecting the outer arc circle and the inner arc circle. The protrusion 13 can be arranged at any position of the outer arc circle, the inner arc circle, and the radial edge, as long as its position corresponds to the position of the pole ear 31, so as to facilitate the fitting and welding of the pole ear 31 and the protrusion 13.

[0040] It can be seen that the main body 11 of the current collecting disk 1 is provided with a through hole 12, and the circumferential edge of the through hole 12 is provided with a protrusion 13 on a surface of the main body 11. When the current collecting disk 1 is applied to a cylindrical battery, the current collecting disk 1 is correspondingly arranged on the side of the pole ear end away from the battery cell 2, and the main body 11 of the current collecting disk 1 is welded and connected to the pole ear end, and the pole ear 31 can pass through the through hole 12 to be welded with the protrusion 13. In this way, the present embodiment can not only realize the welding of the pole ear end and the main body 11, but also increase the welding of the pole ear 31 and the protrusion 13, so that the effective welding area between the current collecting disk 1 and the pole ear end can be greatly increased, so as to improve the current capacity of the cylindrical battery and reduce the internal resistance of the cylindrical battery.

[0041] It should be noted that a central hole 113 is provided at the axis of the current collecting plate 1, and the through hole 12 and the protrusion 13 are arranged at a distance from the central hole 113, that is, the through hole 12 is not arranged at the central hole 113, and there is also a distance between the circumferential edge of the through hole 12 and the central hole 113, so that the protrusion 13 is not arranged at the edge of the central hole 113, so as to avoid the winding needle used for winding the battery cell 2 in the central hole 113, and to facilitate liquid injection, exhaust, etc.

[0042] Specifically, the body 11 includes an inner area 111 and an outer area 112 which are coaxially arranged, the outer area 112 surrounds the circumference of the inner area 111, and a through hole 12 is formed between the outer area 112 and the inner area 111, and the protrusion 13 is arranged at the circumferential edge of the inner area 111. The center hole 113 is arranged at the axis of the inner area 111.

[0043] The inner area 111 and the outer area 112 are connected by a connection area. Except for the connection area, the inner area 111 and the outer area 112 are all through holes 12, so as to reduce the mass of the current collecting disc 1 on the basis of ensuring the integrity of the current collecting disc 1. Theoretically, the protrusions 13 can be set at various parts of the circumferential edge of the through hole 12, namely, the outer arc circle, the inner arc circle, and the radial edge. However, considering the reliability of the connection between the current collecting disc 1 and the pole lug end and the efficiency of current transmission, the protrusions 13 are set at the circumferential edge of the inner area 111, that is, the protrusions 13 are set at the radial inner arc circle edge of the through hole 12.

[0044] The protrusion 13 is obtained by stamping and folding the main body 11 or stamping, cutting and folding, and forms an inner area 111, an outer area 112 and a through hole 12. The appropriate position of the main body 11 of the collector plate 1 is stamped by a stamping device, and then the stamping area is adaptively cut and folded relative to one surface of the main body 11, so that the protrusion 13 is convexly provided on one surface of the main body 11, and the through hole 12 is formed at the stamping position, and the main body 11 is divided into an inner area 111 and an outer area 112 by the through hole 12. On the one hand, the stamping and cutting forming process is simple and convenient to operate; on the other hand, the protrusion 13 and the main body 11 are an integrated structure, which is conducive to improving the current capacity of the battery.

[0045] Generally, there may be one or more protrusions 13 . In this embodiment, there are two protrusions 13 , which are protruded on the same surface of the body 11 and are both located at the circumferential edge of the through hole 12 .

[0046] The protrusion 13 is punched, cut, and folded into two, and the two protrusions 13 are both located at the circumferential edge of the inner area 111. The curvature of the two protrusions 13 is relatively small, and it is not easy to overlap and wrinkle due to the arc structure when folding, so that the flatness of the side of the protrusion 13 can be ensured, which is conducive to the flatness and firmness of welding with the pole ear 31. In addition, the number of the two protrusions 13 is relatively small, which can greatly reduce the difficulty of punching and cutting, thereby effectively reducing costs.

[0047] The two protrusions 13 are both located at the radial inner arc edge of the through hole 12, and the two protrusions 13 are radially symmetrically arranged. The two protrusions 13 are radially symmetrically arranged, so that after the protrusions 13 are welded to the pole lug 31, it is beneficial to improve the stability of the connection between the collector plate 1 and the pole lug end.

[0048] The two protrusions 13 are arranged at intervals, and a notch 14 is provided between the two protrusions 13, and the notch 14 is connected to the through hole 12 as an integral structure. The two protrusions 13 are arranged at intervals on the basis of radial symmetry, which is conducive to further reducing the curvature of the protrusion 13, so as to further improve the flatness of the side of the protrusion 13, thereby improving the flatness and firmness of the welding between the protrusion 13 and the tab 31.

[0049] Theoretically, the two protrusions 13 can be obtained by stamping, cutting and folding twice, but this will significantly increase the complexity of the molding process and increase the cost. Therefore, in this embodiment, a continuous through hole 12 is obtained by stamping once, and the stamping area is correspondingly cut and folded into two spaced and radially symmetrical protrusions 13, so that a cut notch 14 is formed between the two protrusions 13, and the notch 14 is connected to the through hole 12 as an integral structure, which can greatly simplify the molding process and reduce costs.

[0050] The degree of the central angle of the notch 14 is 30°-60°, and the degree of the central angle of the protrusion 13 is 75°-105°. The central angle of the notch 14 is matched with the central angle of the protrusion 13 to ensure that the two radially symmetrical protrusions 13 have a small curvature, so as to avoid stacking more wrinkles when the multi-layer tabs 31 and the corresponding protrusions 13 are bent and welded, thereby avoiding the increase of the stacking thickness and ensuring the welding strength of the tabs 31 and the protrusions 13.

[0051] In addition to welding the other surface of the collector plate 1 to the pole lug end, the collector plate 1 is also fixedly connected to the pole of the battery cover. Figure 7 A connecting piece 15 is provided on the circumferential edge of the main body 11 . The connecting piece 15 can be bent relative to a surface of the main body 11 away from the main body 11 so that the protrusion 13 is located between the connecting piece 15 and the main body 11 .

[0052] The connecting piece 15 is arranged at the circumferential edge of the main body 11, and can be bent into a "z" shape relative to a surface of the main body 11 or directly folded in half to be welded to the pole, thereby realizing the electrical connection between the battery cell 2 and the pole. After being bent, the connecting piece 15 is located above the protruding portion 13, so that the protruding portion 13 is separated from the battery cover by the connecting piece 15 to avoid affecting the structural stability of the protruding portion 13.

[0053] Specifically, the central angle corresponding to the inner area 111 is 360°, and the central angle corresponding to the outer area 112 is 210°-240°, so as to form an opening on the circumferential side of the inner area 111, and the connecting piece 15 is arranged at the opening and connected with the inner area 111 and the outer area 112. The outer area 112 is set as an arc-shaped structure, so that an opening can be reserved for the installation of the connecting piece 15, so that the connecting piece 15 extends outward from the edge of the inner area 111. In this way, when the connecting piece 15 is bent into a "z" shape or directly folded in half, it can ensure that the connecting piece 15 is stably located between the main body 11 and the pole, thereby improving the firmness of the welding between the connecting piece 15 and the pole. At the same time, the central angle of 210°-240° can ensure that the outer area 112 has a large enough area for welding, thereby facilitating the improvement of the flow capacity of the cylindrical battery and reducing the internal resistance of the cylindrical battery.

[0054] Example 2

[0055] See also Figure 1-3 This embodiment provides a cylindrical battery, comprising: a battery cell 2, a pole ear portion 3 and the current collecting plate 1 of embodiment 1, wherein the pole ear portion 3 is disposed at both axial ends of the battery cell 2, and a surface of the pole ear portion 3 facing away from the battery cell 2 is welded to the main body 11 of the current collecting plate 1. The pole ear portion 3 is provided with a pole ear 31 protruding away from the battery cell 2, and the pole ear 31 is arranged corresponding to the protruding portion 13, and the pole ear 31 passes through the through hole 12 and is welded to the protruding portion 13.

[0056] The two axial ends of the battery cell 2 are respectively the positive electrode and the negative electrode, and are respectively provided with a positive electrode ear and a negative electrode ear, and the positive electrode ear and the negative electrode ear are both connected to a current collecting plate 1. In this embodiment, the structures of the current collecting plates 1 corresponding to the positive electrode ear and the negative electrode ear are the same, so no positive and negative distinction is made, and the pole ear 3 is uniformly used instead.

[0057] When assembling the cylindrical battery, the battery cell 2 and the pole ear parts 3 at both ends of the battery cell 2 are formed by winding. The axis of the battery cell 2 and the axis of the pole ear part 3 are respectively provided with a channel and a through hole 32 for placing the winding needle, and can be used for liquid injection, exhaust, etc. The channel, the through hole 32 and the center hole 113 of the collector plate 1 are correspondingly arranged and located on the same axis. The end surface of the pole ear part 3 facing away from the battery cell 2 is welded to the main body 11, and the pole ear 31 can pass through the through hole 12 so that the side of the pole ear 31 is welded to the corresponding side of the protrusion 13, thereby realizing the welding of the pole ear part 3 and the collector plate 1. After the above-mentioned assembly is shelled, the connecting piece 15 of the collector plate 1 is bent to weld the pole of the battery cover plate, and then the battery cover plate is encapsulated at the end of the shell, thereby completing the assembly of the cylindrical battery, and the pole column and the battery cell 2 can be electrically connected through the collector plate 1.

[0058] In this way, the end face of the pole ear portion 3 of the cylindrical battery of this embodiment is not only welded to the main body portion 11, but also the pole ear 31 is welded to the protrusion 13 by fitting, which greatly increases the effective welding area between the current collecting plate 1 and the pole ear portion 3, thereby improving the current carrying capacity of the cylindrical battery and reducing the internal resistance of the cylindrical battery. In addition, when the connecting piece 15 is bent and welded to the pole, the welding of the protrusion 13 and the pole ear 31 can be avoided, which is conducive to improving the firmness of the welding between the protrusion 13 and the pole ear 31.

[0059] In this embodiment, see Figure 7 , the main body 11 and the pole ear 3 are spot-welded or line-welded, and the pole ear 31 and the protrusion 13 are contact-welded. The main body 11 and the pole ear 3 can be welded by spot welding or line welding in the prior art, so as to realize the electrical connection between the main body 11 and the pole ear 3. Since the pole ear 31 and the protrusion 13 are in surface-to-surface contact, the two are contact-welded so that the pole ear 31 and the corresponding side of the protrusion 13 are integrally welded, which not only increases the welding area, improves the firmness of the connection between the two, improves the current capacity, and reduces the internal resistance, but also the contact welding between the pole ear 31 and the protrusion 13 will not affect the main body 11 and the pole ear 3, so that there will be no cold welding or welding through, which is conducive to improving the welding efficiency and the yield rate.

[0060] Generally speaking, the tab 31 can be attached to one side of the protrusion 13, but in this embodiment, the tab 31 is attached to one side of the protrusion 13. Figure 6 The tab 31 is bent to form an “n”-shaped structure, and the tab 31 is attached to two opposite surfaces of the protrusion 13 .

[0061] The pole lug 31 includes at least two pole lug monomers 311. The plurality of pole lug monomers 311 are die-cut, overlapped and compacted to form the pole lug 31. The pole lug 31 passes through the through hole 12 and fits on one side of the protrusion 13, and then is bent and fits on the other side of the protrusion 13. In this way, the pole lug 31 is semi-enclosed and fits on the side of the protrusion 13. After the pole lug 31 and the protrusion 13 are welded, it is beneficial to improve the connection firmness between the two.

[0062] Each pole lug 31 includes at least two pole lug monomers 311 , which is beneficial to reducing the number of pole lugs 31 and protrusions 13 , reducing molding costs, and increasing the thickness of the connection between the pole lug 31 and the protrusion 13 , which is beneficial to improving the current flow capacity.

[0063] There are two pole tabs 31 , the number of the protrusions 13 is equal to the number of the pole tabs 31 and the positions are one-to-one corresponding, and the two pole tabs 31 both pass through the through holes 12 and are welded to the corresponding two protrusions 13 .

[0064] The protrusion 13 is folded into two by punching, cutting and folding. Both protrusions 13 are located at the circumferential edge of the inner area 111. The curvature of the two protrusions 13 is relatively small, and it is not easy to overlap and wrinkle due to the arc structure when folding, so that the flatness of the side of the protrusion 13 can be ensured. The pole ear 31 is arranged corresponding to the protrusion 13. Correspondingly, the curvature of the pole ear 31 is small. After the pole ear 31 passes through the through hole 12, the fitting and bending of the pole ear 31 and the side of the protrusion 13 are not easy to overlap and wrinkle, which is conducive to improving the flatness and firmness of the welding between the protrusion 13 and the pole ear 31. In addition, the number of the two protrusions 13 is relatively small, which can greatly reduce the difficulty of punching and cutting, thereby effectively reducing the cost. The number of the two pole ears 31 is relatively small, which is conducive to reducing the die-cutting compaction cost and simplifying the process.

[0065] Further, the two pole tabs 31 are arranged at intervals, and the two pole tabs 31 are radially symmetrical. Correspondingly, the two protrusions 13 are arranged at intervals and radially symmetrically. The two protrusions 13 and the two pole tabs 31 are arranged at intervals on the basis of radial symmetry, which is conducive to further reducing the curvature of the protrusions 13 and the pole tabs 31, so as to further improve the flatness of the sides of the protrusions 13 and the pole tabs 31, thereby improving the flatness and firmness of the welding of the protrusions 13 and the pole tabs 31.

[0066] The technical means disclosed in the present application are not limited to the technical means disclosed in the above-mentioned implementation methods, but also include technical solutions composed of any combination of the above technical features. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of this application, and these improvements and modifications are also regarded as the protection scope of this application.

Claims

1. A collecting plate, characterized in that: include: A main body (11), wherein the main body (11) is provided with a through hole (12), and the through hole (12) is arranged outside the axis of the main body (11); A protruding portion (13), wherein the protruding portion (13) is protruding from a surface of the main body portion (11), and the protruding portion (13) is located at the circumferential edge of the through hole (12).

2. The collecting plate according to claim 1, characterized in that: The main body (11) comprises an inner area (111) and an outer area (112) which are coaxially arranged, wherein the outer area (112) surrounds the circumference of the inner area (111), and the through hole (12) is formed between the outer area (112) and the inner area (111), and the protrusion (13) is arranged on the circumferential edge of the inner area (111).

3. The collecting plate according to claim 2, characterized in that: The protruding portion (13) is obtained by punching and folding the main body portion (11) or punching, cutting and folding the main body portion (11), and forms the inner area (111), the outer area (112) and the through hole (12).

4. The collector plate according to any one of claims 1 to 3, characterized in that: Two protruding portions (13) are provided, and the two protruding portions (13) are protruding from the same surface of the main body (11), and the two protruding portions (13) are both located at the circumferential edge of the through hole (12).

5. The collecting plate according to claim 4, characterized in that: The two protrusions (13) are both located at the radial inner arc edge of the through hole (12), and the two protrusions (13) are radially symmetrically arranged.

6. The collecting plate according to claim 5, characterized in that: The two protruding portions (13) are arranged at intervals, and a notch (14) is provided between the two protruding portions (13), and the notch (14) is connected to the through hole (12) to form an integrated structure.

7. The collecting plate according to claim 6, characterized in that: The degree of the central angle corresponding to the notch (14) is 30°-60°, and the degree of the central angle corresponding to the protrusion (13) is 75°-105°.

8. The collecting plate according to claim 2 or 3, characterized in that: A connecting piece (15) is provided on the circumferential edge of the main body (11), and the connecting piece (15) can be bent relative to a surface of the main body (11) away from the main body (11) so that the protrusion (13) is located between the connecting piece (15) and the main body (11).

9. The collecting plate according to claim 8, characterized in that: The central angle corresponding to the inner area (111) is 360°, and the central angle corresponding to the outer area (112) is 210°-240°, so as to form an opening on the circumferential side of the inner area (111), and the connecting piece (15) is arranged at the opening and connected to the inner area (111) and the outer area (112).

10. A battery, characterized in that: include: A battery cell (2), a pole ear portion (3), and a current collecting plate (1) according to any one of claims 1 to 9, wherein the pole ear portion (3) is arranged at two axial ends of the battery cell (2), and a surface of the pole ear portion (3) facing away from the battery cell (2) is welded to the main body (11) of the current collecting plate (1); The pole ear portion (3) is provided with a pole ear (31) protruding away from the battery core (2); the pole ear (31) is arranged corresponding to the protruding portion (13); the pole ear (31) passes through the through hole (12) and is welded to the protruding portion (13).

11. The battery according to claim 10, characterized in that: The pole ear (31) is bent to form an "n"-shaped structure, and the pole ear (31) is attached to two opposite surfaces of the protruding portion (13).

12. A battery according to claim 10, characterized in that: The main body (11) and the pole ear (3) are connected by spot welding or line welding, and the pole ear (31) and the protruding portion (13) are connected by contact welding.

13. The battery according to any one of claims 10 to 12, characterized in that: Two pole lugs (31) are provided, the number of the protrusions (13) is equal to the number of the pole lugs (31) and their positions correspond one to one, and both pole lugs (31) pass through the through hole (12) and are welded to the corresponding two protrusions (13).

14. The battery according to claim 12, characterized in that: The two pole lugs (31) are arranged at intervals, and the two pole lugs (31) are radially symmetrical.

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