Current collector and battery
By designing the multi-path electrolyte flow channel of the current collector, the problem of the electrolyte flow path blocked after welding is solved, the good wetting of the core-rolling electrode sheet and the improvement of the electrolyte liquid injection efficiency are achieved, and the structural strength of the current collector is ensured. .
Patent Information
- Application Number
- CN202420946642.X
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-04-30
- Publication Date
- 2025-02-18
- Estimated Expiration
- 2034-04-30
AI Technical Summary
After the current collector is welded to the core electrode sheet, the flow path of the electrolyte is blocked, which in turn leads to poor infiltration of the electrode sheet or risk of electrolyte.
A current collector is designed, with a central through hole, an edge opening and a surrounding through hole group being opened on the main body part. The edge opening and the surrounding through hole group are located on opposite sides of the central through hole, forming a multi-path electrolyte flow channel.
Through the multi-path electrolyte flow channel, the wetting effect of the core-rolling electrode sheet is improved, the liquid injection efficiency of the electrolyte is improved, and the structural strength of the current collector is ensured.
Smart Images
Figure CN222507917U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to a current collector and a battery. Background Art
[0002] The battery usually includes a core and a current collector. The current collector is mainly used to concentrate the current into the core or out of the battery cell to realize the charging and discharging of the battery. The current collector needs to be welded to the pole piece of the core (for example, the positive pole piece or the negative pole piece). However, after the two are welded, the closed welding point will hinder the flow path of the electrolyte, resulting in poor wetting of the pole piece of the core or the risk of electrolyte bubbling out when the battery is injected with electrolyte. Utility Model Content
[0003] The embodiments of the utility model provide a current collector and a battery, which can improve the technical problem in the related art that the flow path of the electrolyte is blocked after the current collector and the pole piece are welded.
[0004] In the first aspect, an embodiment of the utility model provides a current collector, which includes a main body, on which is opened a central through hole, and edge openings located on opposite sides of the central through hole and a surrounding through hole group, wherein the surrounding through hole group includes at least one surrounding through hole, and the depth direction of the edge opening is toward the central through hole.
[0005] In one embodiment, the peripheral through hole group includes a plurality of peripheral through holes, and the distance between the center point of each peripheral through hole and the center point of the central through hole is equal.
[0006] In one embodiment, the plurality of peripheral through holes are located on both sides of the edge opening in a depth direction.
[0007] In one embodiment, a ratio of a minimum distance between two adjacent peripheral through holes to a diameter of the main body is greater than or equal to 0.1 and less than or equal to 0.4.
[0008] In one embodiment, the cross-section of the central through hole on the plane of the main body is circular; the ratio of the diameter of the central through hole to the diameter of the main body is greater than or equal to 0.1 and less than or equal to 0.5.
[0009] In one embodiment, the cross-section of the peripheral through hole on the plane of the main body is circular, and the ratio of the diameter of the peripheral through hole to the diameter of the main body is greater than or equal to 0.05 and less than or equal to 0.2.
[0010] In one embodiment, a ratio of an opening size of the edge opening away from the central through hole to an opening size of the edge opening close to the central through hole is greater than 1 and less than or equal to 3.
[0011] In one embodiment, the current collector further includes a connecting portion and a tail portion, wherein two ends of the connecting portion are respectively connected to the main portion and the tail portion, an auxiliary opening is provided on at least one side of the connecting portion, and the connecting portion is configured to bend at the auxiliary opening.
[0012] In one embodiment, the connecting portion includes a first bending section, a connecting section and a second bending section connected in sequence, the second bending section is connected to the tail portion, the first bending section is connected to the main body portion, and the auxiliary opening is arranged on the first bending section.
[0013] In one embodiment, at least one side of the second bending section is further provided with a tail adjustment opening, and the second bending section is configured to bend at the tail adjustment opening.
[0014] In a second aspect, an embodiment of the utility model provides a battery, which includes the current collector described in any of the above embodiments.
[0015] Beneficial effects of the embodiments of the utility model:
[0016] For the current collector provided by the embodiment of the utility model, the edge opening can facilitate the electrolyte to enter one side of the core from the injection port of the battery shell, the central through hole can facilitate the electrolyte to enter the center of the core, and the peripheral through hole group can facilitate the electrolyte to enter the position on the other side of the core, which is conducive to the infiltration of the pole piece in the core over a large range, and is also conducive to improving the electrolyte injection efficiency. In addition, the edge opening and the peripheral through hole group are respectively located on opposite sides of the central through hole, which can also avoid the problem of weak structural strength of the main body caused by the peripheral through hole group and the edge opening being located on the same side of the central through hole, thereby ensuring that the main body has good structural strength. BRIEF DESCRIPTION OF THE DRAWINGS
[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.
[0018] Figure 1 It is a schematic diagram of the structure of the current collector provided by some embodiments of the utility model;
[0019] Figure 2 It is a schematic diagram of the structure of the current collector provided by other embodiments of the utility model;
[0020] Figure 3 It is a schematic diagram of the structure of batteries provided in some embodiments of the utility model. DETAILED DESCRIPTION
[0021] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application. In addition, it should be understood that the specific implementation methods described herein are only used to illustrate and explain the present application, and are not used to limit the present application. In the present application, unless otherwise stated, the directional words such as "upper" and "lower" used generally refer to the upper and lower parts of the device in actual use or working state, specifically the drawing direction in the accompanying drawings; while "inside" and "outside" refer to the outline of the device.
[0022] In the description of the specification, the terms "one embodiment", "some embodiments", "exemplary embodiments", "examples", or "some examples" are intended to indicate that a specific feature, structure, material, or characteristic associated with the embodiment or example is included in at least one embodiment or example of the present application. The schematic representation of the above terms does not necessarily refer to the same embodiment or example. In addition, the specific features, structures, materials, or characteristics may be included in any one or more embodiments or examples in any appropriate manner.
[0023] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present application, unless otherwise specified, "plurality" means two or more.
[0024] When describing some embodiments, the term "connected" and its derivative expressions may be used. For example, when describing some embodiments, the term "connected" may be used to indicate that two or more components are in direct physical or electrical contact with each other. The embodiments disclosed herein are not necessarily limited to the contents of this document.
[0025] As used herein, "approximately" includes the stated values and averages that are within an acceptable range of deviation from the particular value, where the acceptable range of deviation is determined by one of ordinary skill in the art taking into account the measurements in question and the errors associated with the measurement of the particular quantity (i.e., the limitations of the measurement system).
[0026] In the related art, after the current collector is welded to the electrode sheet (eg, positive electrode sheet or negative electrode sheet) of the winding core, the flow path of the electrolyte is often blocked, which in turn causes poor wetting of the electrode sheet of the winding core or the risk of electrolyte bubbling out when the electrolyte is injected into the battery.
[0027] Based on this, the present application embodiment provides a current collector, such as Figure 1 and Figure 2 As shown, the current collector 100 includes a main body 11 , on which a central through hole 10 , edge openings 20 located on opposite sides of the central through hole 10 , and a peripheral through hole group 30 are formed.
[0028] The peripheral through hole group 30 includes at least one peripheral through hole 31. The peripheral through hole 31 and the central through hole 10 are both arranged to penetrate along the thickness direction of the main body 11, that is, the depth directions of the peripheral through hole 31 and the central through hole 10 are consistent with the thickness direction of the main body 11. The depth direction of the edge opening 20 is toward the central through hole 10.
[0029] For the above-mentioned current collector, the edge opening 20 can facilitate the electrolyte to enter one side of the winding core from the injection port of the battery shell, the central through hole 10 can facilitate the electrolyte to enter the center position of the winding core, and the peripheral through hole group 30 can facilitate the electrolyte to enter the position on the other side of the winding core, which is conducive to the infiltration of the pole piece in the winding core over a large range, and is also conducive to improving the electrolyte injection efficiency. In addition, the edge opening 20 and the peripheral through hole group 30 are respectively located on opposite sides of the central through hole 10, which can also avoid the problem of weak structural strength of the main body 11 caused by the peripheral through hole group 30 and the edge opening 20 being located on the same side of the central through hole 10, thereby ensuring that the main body 11 has good structural strength.
[0030] In some examples, such as Figure 1 and Figure 2 As shown, the plane of the main body 11 is roughly circular. The outer periphery of the main body 11 includes a first side 111, a second side 112, a third side 113 and a fourth side 114 connected in sequence, and the fourth side 114 is located at the edge opening 20. The first side 111 and the third side 113 are arc-shaped, and the extension direction of the two is consistent with the circumference of the circle. The second side 112 is a straight line. The center point of the central through hole 10 can coincide with the center point of the first arc-shaped side 111 and the center point of the third arc-shaped side 113. The diameter of the main body 11 is twice the radius corresponding to the first arc-shaped side 111.
[0031] In some embodiments, Figure 2 As shown, the peripheral through hole group 30 includes a plurality of peripheral through holes 31 , and the distance between the center point of each peripheral through hole 31 and the center point of the central through hole 10 is equal.
[0032] In this way, multiple peripheral through holes 31 surround the central through hole 10 and are arranged in a ring shape. This is conducive to the circulation of electrolyte in multiple parts of the winding core in the same ring area, so that the electrode sheets in the winding core can be infiltrated in a larger range, and the electrolyte injection efficiency can also be improved.
[0033] In some embodiments, Figure 1 and Figure 2 As shown, the cross section of the central through hole 10 on the plane of the main body 11 is circular. At this time, the center point of the central through hole 10 coincides with the center of the circular cross section.
[0034] By setting the central through hole 10 to be circular, it is convenient to open the central through hole 10 .
[0035] In some examples, a ratio of a diameter of the central through hole 10 to a diameter of the main body 11 is greater than or equal to 0.1 and less than or equal to 0.5.
[0036] For example, the ratio of the diameter of the central through hole 10 to the diameter of the main body 11 may be 0.1, 0.2, 0.3, 0.4 or 0.5, etc., which is not limited in the embodiments of the present application.
[0037] By setting the ratio of the diameter of the central through hole 10 to the diameter of the main body 11 within the above range, on the one hand, it can be ensured that the central through hole 10 has a larger opening area, so that the electrolyte can smoothly pass through the central through hole 10 into the center position of the winding core; on the other hand, it can also be ensured that the main body 11 as a whole has better structural strength and a larger welding area (for example, the area of the main body 11 excluding the central through hole 10, the edge opening 20 and the surrounding through holes 31) to connect with the pole ears in the winding core.
[0038] In some examples, the diameter of the central through hole 10 may be greater than or equal to 1 mm and less than or equal to 10 mm.
[0039] Exemplarily, the diameter of the central through hole 10 may be 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, 10 mm, etc., which is not limited in the embodiments of the present application.
[0040] By setting the diameter of the central through hole 10 within the range of 1 mm to 10 mm, on the one hand, it can be avoided that the central through hole 10 is too small to affect the electrolyte entering the center position of the winding core; on the other hand, it can be avoided that the central through hole 10 is too large to affect the structural strength of the main body 11.
[0041] In some embodiments, Figure 1 and Figure 2As shown, the cross section of the peripheral through hole 31 on the plane of the main body 11 is circular, and at this time, the center point of the peripheral through hole 31 coincides with the center of the circular cross section.
[0042] By setting the peripheral through hole 31 to be circular, it is convenient to open the peripheral through hole 31 .
[0043] In some examples, a ratio of a diameter of the peripheral through hole 31 to a diameter of the main body portion 11 is greater than or equal to 0.05 and less than or equal to 0.2.
[0044] For example, the ratio of the diameter of the peripheral through hole 31 to the diameter of the main body 11 may be 0.05, 0.1, 0.15 or 0.2, etc., which is not limited in the embodiment of the present application.
[0045] By setting the ratio of the diameter of the peripheral through hole 31 to the diameter of the main body 11 within the above range, on the one hand, it can ensure that the peripheral through hole 31 has a larger opening area, thereby improving the efficiency of the electrolyte entering the winding core; on the other hand, it can ensure that the main body 11 has better structural strength and a larger welding area to connect with the pole ear in the winding core.
[0046] In some examples, the diameter of the peripheral through hole 31 may be greater than or equal to 1 mm and less than or equal to 10 mm.
[0047] Exemplarily, the diameter of the peripheral through hole 31 may be 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, 10 mm, etc., which is not limited in the embodiment of the present application.
[0048] By setting the diameter of the peripheral through hole 31 within the range of 1 mm to 10 mm, on the one hand, it can be avoided that the peripheral through hole 31 is too small to affect the efficiency of the electrolyte entering the winding core; on the other hand, it can be avoided that the peripheral through hole 31 is too large to affect the structural strength of the main body 11.
[0049] In some examples, the diameter of the peripheral through hole 31 may be the same as the diameter of the central through hole 10 , which can facilitate the opening of the peripheral through hole 31 and the central through hole 10 .
[0050] In other examples, the diameter of the peripheral through hole 31 and the diameter of the central through hole 10 may also be different. Figure 2 As shown, the diameter of the central through hole 10 may be larger than the diameter of the peripheral through holes 31 .
[0051] In some examples, the area where the main body 11 is located between two adjacent peripheral through holes 31, and the area between the edge opening 20 and the adjacent peripheral through hole 31 are both welding areas, which can be used to weld with the pole ear in the winding core, so that the current collector 100 can be used to introduce or conduct current.
[0052] In some embodiments, Figure 2 As shown, a plurality of peripheral through holes 31 are located on both sides of the edge opening 20 in the depth direction.
[0053] This arrangement allows the position of the main body 11 opposite to the edge opening 20 to serve as a welding area, thereby facilitating the welding stability between the main body 11 and the winding core.
[0054] In some examples, the edges on both sides of the edge opening 20 may be symmetrically arranged with respect to the depth direction of the edge opening 20 .
[0055] In some embodiments, Figure 2 As shown, the ratio of the minimum distance D3 between two adjacent peripheral through holes 31 to the diameter of the main body 11 is greater than or equal to 0.1 and less than or equal to 0.4.
[0056] Such arrangement can avoid the problem that the spacing between adjacent peripheral through holes 31 is too close, resulting in weak structural strength of the main body 11 at the position between adjacent peripheral through holes 31; at the same time, it can also avoid the problem that the spacing between adjacent peripheral through holes 31 is too large, resulting in the peripheral through holes 31 being located relatively outside the main body 11, thereby making the peripheral through holes 31 too far away from the central through hole 10 and causing a small amount of electrolyte to pass through the peripheral through holes 31, thereby affecting the wetting effect of the electrolyte on the electrode in the winding core.
[0057] It should be noted that the minimum distance D3 between two adjacent peripheral through holes 31 is the distance D3 between the hole walls of the two adjacent peripheral through holes 31 that are closest to each other.
[0058] In some examples, the ratio of the minimum distance D3 between two adjacent peripheral through holes 31 to the diameter of the main body 11 may be 0.1, 0.2, 0.3 or 0.4, etc., which is not limited in the embodiments of the present application.
[0059] In some examples, the minimum distance D3 between two adjacent peripheral through holes 31 is greater than or equal to 1 mm and less than or equal to 20 mm.
[0060] This arrangement can, on the one hand, avoid the problem of the main body 11 having a weak structural strength due to the spacing between adjacent peripheral through holes 31 being too close; on the other hand, it can also avoid the problem of the surrounding through holes 31 being too large due to the spacing between adjacent peripheral through holes 31 being located relatively outside the main body 11, thereby making the surrounding through holes 31 too far away from the central through hole 10 and causing a small amount of electrolyte to pass through the surrounding through holes 31, thereby affecting the wetting effect of the electrolyte on the electrode in the winding core.
[0061] In some examples, the minimum distance between two adjacent peripheral through holes 31 among the multiple peripheral through holes 31 may be 1 mm, 3 mm, 5 mm, 7 mm, 9 mm, 10 mm, 11 mm, 13 mm, 15 mm, 17 mm, 19 mm, 20 mm, etc., which is not limited to the embodiments of the present application.
[0062] In some examples, the minimum distance between two adjacent peripheral through holes 31 in the plurality of peripheral through holes 31 may be greater than or equal to 5 mm and less than or equal to 10 mm. By setting the minimum distance between two adjacent peripheral through holes 31 within this interval, on the one hand, the main body 11 can be effectively guaranteed to have good structural strength, and on the other hand, the electrolyte can be effectively guaranteed to have an infiltration effect on the electrode in the winding core.
[0063] In some embodiments, Figure 2 As shown, the peripheral through hole group 30 may include two peripheral through holes 31 , and the two peripheral through holes may be symmetrically arranged with respect to the depth direction of the edge opening 20 .
[0064] In some embodiments, Figure 1 and Figure 2 As shown, the ratio of the opening size D1 of the edge opening 20 away from the central through hole 10 to the opening size D2 of the edge opening 20 close to the central through hole 10 is greater than 1 and less than or equal to 3.
[0065] Since the ratio of the opening size D1 of the edge opening 20 away from the end of the central through hole 10 to the opening size D2 of the edge opening 20 close to the central through hole 10 is greater than 1, that is, the opening size D1 of the edge opening 20 away from the end of the central through hole 10 is greater than the opening size D2 of the edge opening 20 close to the central through hole 10. In this way, along the depth direction of the edge opening 20, the edge opening 20 has a structure that is large outside and small inside. With this arrangement, the edge opening 20 can facilitate the electrolyte to enter the side of the winding core to a greater extent from the injection port of the battery shell. In addition, since the ratio of the opening size D1 of the edge opening 20 away from the end of the central through hole 10 to the opening size D2 of the edge opening 20 close to the central through hole 10 is less than or equal to 3, this can also prevent the opening size D1 of the edge opening 20 away from the end of the central through hole 10 from being too large and affecting the structural strength of the current collector 100.
[0066] In some examples, the ratio of the opening size D1 of the edge opening 20 away from the central through hole 10 to the opening size D2 of the edge opening 20 close to the central through hole 10 can be 1.5, 2, 2.5 or 3, etc., which is not limited in the embodiments of the present application.
[0067] In some examples, the cross-section of the edge opening 20 at one end close to the central through hole 10 on the plane of the main body 11 is arc-shaped, which is conducive to widening the size of the edge opening 20, thereby making it more convenient for the electrolyte to pass through the edge opening 20 from the liquid filling port of the battery shell into one side of the winding core.
[0068] In some examples, the edges on both sides of the edge opening 20 are arranged in straight lines. In this case, the opening size of the edge opening 20 gradually decreases along the direction in which the edge opening 20 approaches the central through hole 10. There is an angle between the edges on both sides of the edge opening 20, and the angle is greater than or equal to 10° and less than or equal to 90°. This helps to avoid the area occupied by the edge opening 20 being too large, thereby avoiding the problems of poor structural stability of the main body 11 and poor connection stability between the main body 11 and the winding core due to the small welding surface of the main body 11.
[0069] In some embodiments, Figure 1 and Figure 2 As shown, the current collector 100 further includes a connecting portion 12 and a tail portion 13 , wherein two ends of the connecting portion 12 are respectively connected to the main portion 11 and the tail portion 13 , an auxiliary opening 40 is provided on at least one side of the connecting portion 12 , and the connecting portion 12 is configured to be bent at the auxiliary opening 40 .
[0070] The tail 13 can be used for welding with the cover plate, and the current can be conducted through the connection part 12 and the main body 11, so that the current can be introduced or exported to the core. In addition, the auxiliary opening 40 is used to help bend the connection part 12, so that it is easy to weld the tail 13 and the cover plate, and the tail 13 can be folded behind the main body 11, which is conducive to the final formation of the battery. In addition, the auxiliary opening 40 can also be used as a positioning point to facilitate the production of the current collector 100 and the assembly with other related structural parts.
[0071] In some examples, auxiliary openings 40 are provided on both sides of the connection portion 12, which is conducive to bending the connection portion 12 along the line between the two auxiliary openings 40, thereby facilitating the solidification of the bending line and improving the accuracy of bending the connection portion 12. In addition, the auxiliary openings 40 on both sides can further improve the positioning accuracy, thereby facilitating the production of the current collector 100 and the assembly with other related structural parts.
[0072] In some examples, the connecting portion 12 , the tail portion 13 , and the main body portion 11 may be located in the same extending direction, and the extending direction may be consistent with the depth direction of the edge opening 20 .
[0073] In some examples, the connecting portion 12 , the tail portion 13 , and the main body 11 may be integrally formed, which helps to enhance the structural stability of the current collector 100 .
[0074] In some examples, the tail portion 13 is further provided with a welding through hole 60, which facilitates welding between the tail portion 13 and the cover plate. For example, when the tail portion 13 is folded to the back of the main body 11, the welding through hole 60 is arranged opposite to the central through hole 10.
[0075] In some embodiments, Figure 1 and Figure 2 As shown, the connecting portion 12 includes a first bending segment 121 , a connecting segment 122 and a second bending segment 123 connected in sequence, the second bending segment 123 is connected to the tail portion 13 , the first bending segment 121 is connected to the main body 11 , and the auxiliary opening 40 is disposed on the first bending segment 121 .
[0076] By arranging the auxiliary opening 40 on the first bending section 121 close to the main body 11, it is helpful to reduce the area occupied by the current collector 100 after bending, thereby helping to reduce the size of the battery including the current collector 100. In addition, the position of the cover plate can also be adjusted by using the second bending section 123, which is helpful to arrange the cover plate vertically.
[0077] In some embodiments, Figure 1 and Figure 2 As shown, at least one side of the second bending section 123 is further provided with a tail adjustment opening 50 , and the second bending section 123 is configured to bend at the tail adjustment opening 50 .
[0078] The tail adjustment opening 50 is used to help bend the second bending section 123, thereby facilitating the adjustment of the cover plate position and realizing the relative arrangement of the welding through hole 60 and the central through hole 10. In addition, the tail adjustment opening 50 can also be used as a positioning point to facilitate the production of the current collector 100 and the assembly with other related structural parts.
[0079] In some examples, tail adjustment openings 50 are disposed on both sides of the second bending section 123 .
[0080] In some embodiments, a cross section of at least one of the tail regulating opening 50 and the auxiliary opening 40 on the plane of the connecting portion 12 is semicircular, and a diameter of the semicircle is greater than or equal to 0.1 mm and less than or equal to 5 mm.
[0081] This size setting can, on the one hand, help prevent the opening size from being too small to achieve a good bending effect; on the other hand, it can also prevent the opening size from being too large to affect the structural strength of the connecting portion 12.
[0082] In some examples, the thickness of the current collector 100 may be set within a range of 0.1 mm to 1 mm.
[0083] Some embodiments of the present application also provide a battery, such as Figure 3 As shown, the battery 200 includes the current collector 100 described in any of the above embodiments.
[0084] Since the battery includes the current collector 100 , the battery has the technical effects possessed by the current collector 100 , which will not be described in detail here.
[0085] In some examples, the battery also includes a winding core and a shell, the winding core includes a positive electrode sheet, a negative electrode sheet and a separator located between the positive electrode sheet and the negative electrode sheet, the welding area of the main body 11 of the current collector 100 can be welded to the ear of the negative electrode sheet, and the tail 13 of the current collector 100 can be welded to the cover plate of the battery.
[0086] The above is a detailed introduction to the embodiments of the present invention. Specific examples are used in this article to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core idea of the present invention. At the same time, for technicians in this field, according to the idea of the present invention, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present invention.
Claims
1. A current collector, characterized in that: It comprises a main body, which is provided with a central through hole, edge openings on opposite sides of the central through hole, and a peripheral through hole group, wherein the peripheral through hole group comprises at least one peripheral through hole, and the depth direction of the edge opening faces the central through hole.
2. The current collector according to claim 1, characterized in that: The peripheral through hole group includes a plurality of peripheral through holes, and the distance between the center point of each peripheral through hole and the center point of the central through hole is equal.
3. The current collector according to claim 2, characterized in that: The plurality of peripheral through holes are located on both sides of the edge opening in a depth direction.
4. The current collector according to claim 2, characterized in that: The ratio of the minimum distance between two adjacent peripheral through holes to the diameter of the main body is greater than or equal to 0.1 and less than or equal to 0.
4.
5. The current collector according to claim 1, characterized in that: The cross section of the central through hole on the plane of the main body is circular; the ratio of the diameter of the central through hole to the diameter of the main body is greater than or equal to 0.1 and less than or equal to 0.5; and / or The cross section of the peripheral through hole on the plane of the main body is circular, and the ratio of the diameter of the peripheral through hole to the diameter of the main body is greater than or equal to 0.05 and less than or equal to 0.
2.
6. The current collector according to claim 1, characterized in that: The ratio of the opening size of the edge opening away from the end of the central through hole to the opening size of the edge opening close to the end of the central through hole is greater than 1 and less than or equal to 3.
7. The current collector according to any one of claims 1 to 6, characterized in that: It also includes a connecting portion and a tail portion, wherein two ends of the connecting portion are respectively connected to the main body portion and the tail portion, at least one side of the connecting portion is provided with an auxiliary opening, and the connecting portion is configured to be bent at the auxiliary opening.
8. The current collector according to claim 7, characterized in that: The connecting portion includes a first bending section, a connecting section and a second bending section which are connected in sequence, the second bending section is connected to the tail portion, the first bending section is connected to the main body portion, and the auxiliary opening is arranged on the first bending section.
9. The current collector according to claim 8, characterized in that: At least one side of the second bending section is further provided with a tail adjustment opening, and the second bending section is configured to bend at the tail adjustment opening.
10. A battery, characterized in that: include: The current collector according to any one of claims 1 to 9.