Current collector and battery

Abstract

The utility model provides a current collector and a battery, relates to the technical field of batteries, and aims to solve the technical problem that an electrolyte circulation path is blocked after the current collector and a pole piece are welded in the related technology. The current collector is provided with a plurality of open pore areas arranged around the center point of the current collector, at least one open pore area is a reference open pore area, the reference open pore area is in a sector ring shape, a through hole set is arranged in the reference open pore area, the through hole set comprises a plurality of through hole sets arranged in the direction away from the center point of the current collector, and the through hole sets are arranged in the direction away from the center point of the current collector. Each through hole group comprises a plurality of through holes which are arranged in a penetrating manner along the thickness direction of the current collector, and the distances between the through holes in the same through hole group and the central point of the current collector are equal.

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 has a plurality of opening areas arranged around the center point of the current collector, at least one of the opening areas is a reference opening area, the reference opening area is fan-shaped, and a through-hole set is provided in the reference opening area, the through-hole set includes a plurality of through-hole groups arranged in a direction away from the center point of the current collector, each of the through-hole groups includes a plurality of through-holes arranged along the thickness direction of the current collector, and each of the through-holes in the same through-hole group is at an equal distance from the center point of the current collector.

[0005] In one embodiment, the distances between the center points of two adjacent through holes in the same through hole group are equal.

[0006] In one embodiment, the distance between the center points of two adjacent through holes in the same through hole group is M1, the center point of each through hole in the through hole group is located on an arc segment, the center of the arc segment coincides with the center point of the collector, both ends of the arc segment are connected to the boundary of the reference opening area, and the length of the arc segment is M2, 1 / 7≤M1 / M2≤1 / 5.

[0007] In one embodiment, the cross-section of the through hole in the plane direction of the current collector is circular, and the ratio of the diameter of the through hole to the minimum spacing distance between two adjacent through hole groups is greater than or equal to 0.25 and less than or equal to 0.5.

[0008] In one embodiment, the cross-section of the through hole in the plane direction of the current collector is circular, and the ratio of the diameter of the through hole to the diameter of the current collector is greater than or equal to 0.02 and less than or equal to 0.15.

[0009] In one embodiment, an edge opening group is further provided in the reference opening area, and the edge opening group includes at least one edge opening, the cross section of the edge opening in the plane direction of the current collector is semicircular, and the diameter of the edge opening is the same as the diameter of the through hole.

[0010] In one embodiment, the edge opening group includes a plurality of edge openings, and a center point of one edge opening corresponds to a center point of one through hole in each through hole group and a center point of the current collector on the same straight line.

[0011] In one embodiment, the current collector further has a plurality of first welding areas arranged around the center point of the current collector, each of the first welding areas is in a fan ring shape and is adjacent to two adjacent opening areas.

[0012] In one embodiment, the current collector includes a raised portion located in the first welding area and a planar portion located in the opening area, the raised portion has a welding surface, and the planar portion has a reference surface arranged on the same side as the welding surface, and the vertical distance between the plane where the welding surface is located and the plane where the reference surface is located is greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

[0013] In one embodiment, the current collector further has a second welding area, the center point of the current collector is located in the second welding area, and the second welding area is adjacent to the plurality of opening areas and the plurality of first welding areas.

[0014] In one embodiment, the ratio of the total area of ​​the plurality of open areas to the area of ​​the current collector is greater than or equal to 0.35 and less than or equal to 0.65.

[0015] 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.

[0016] Beneficial effects of the embodiments of the utility model:

[0017] For the current collector provided by the embodiment of the utility model, since the reference opening area is in the shape of a fan ring, multiple through-hole groups can divide the fan-ring area into multiple layout areas, and each layout area is provided with a corresponding through-hole group; and for each layout area, all the through-holes in the through-hole group are arranged in a ring array around the center point of the current collector, so that all the through-holes in the through-hole group can be arranged relatively evenly in the area. On the one hand, this is conducive to ensuring that there are a large number of through-holes, so that there is a larger opening area on the current collector for the electrolyte to flow, and effectively ensuring that the electrolyte can enter the inside of the winding core, thereby enhancing the wetting effect of the electrode and accelerating the injection efficiency of the electrolyte; on the other hand, it can also effectively ensure the structural strength of the current collector, and avoid the problem of low structural strength of the local position of the current collector due to the scattered opening of through-holes. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] 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.

[0019] Figure 1 It is a schematic diagram of the structure of the current collector provided by an embodiment of the utility model;

[0020] Figure 2 is a schematic top view of a current collector provided in an embodiment of the utility model;

[0021] Figure 3 yes Figure 1 A cross-sectional view along the A-A' direction;

[0022] Figure 4 It is a schematic diagram of the structure of a battery provided in an embodiment of the utility model. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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).

[0028] “A and / or B” includes the following three combinations: A only, B only, and a combination of A and B.

[0029] 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.

[0030] Based on this, the present application embodiment provides a current collector, such as Figure 1 and Figure 2 As shown, the current collector 100 has a plurality of opening areas 10 arranged around the center point O of the current collector 100, at least one opening area 10 is a reference opening area, the reference opening area is in a fan ring shape, and a through hole set 11 is provided in the reference opening area.

[0031] The through hole set 11 includes a plurality of through hole groups 110 arranged in a direction away from the center point O of the current collector 100, and each through hole group 110 includes a plurality of through holes 101 arranged to penetrate the current collector 100 in the thickness direction of the current collector 100. The distance between each through hole 101 in the same through hole group 110 and the center point O of the current collector 100 is equal. That is, for all through holes 101 in the same through hole group 110, they are all located on a circular arc with the center point O of the current collector 100 as the center.

[0032] It is worth noting that the distance between each through hole 101 in the same through hole group 110 and the center point O of the current collector 100 is equal, which can mean that the distance between the characteristic point of each through hole 101 and the center point O of the current collector 100 is equal. When the cross section of the through hole 101 on the plane of the current collector 100 is circular, the characteristic point can be the center point of the circle. When the cross section of the through hole 101 on the plane of the current collector 100 is elliptical, the characteristic point can be the focus of the ellipse.

[0033] Figure 2 4 through hole groups 110 are shown, which are the first through hole group 102, the second through hole group 103, the third through hole group 104 and the fourth through hole group 105. The first through hole group 102, the second through hole group 103, the third through hole group 104 and the fourth through hole group 105 are arranged in sequence in a direction away from the center point O of the current collector 100. For the convenience of illustration, Figure 2 The reference numbers 102-105 only indicate one through hole in the corresponding through hole group, and do not limit the number of through holes in the through hole group.

[0034] Since the reference opening area is in the shape of a fan ring, a plurality of through hole groups 110 can divide the fan ring area into a plurality of arrangement areas, each arrangement area being provided with a corresponding through hole group; and for each arrangement area, all through holes 101 in the through hole group 110 are arranged in a ring array around the center point O of the current collector 100, so that all through holes 101 in the through hole group 110 can be arranged relatively uniformly in the area. This is beneficial for ensuring that there are a large number of through holes 101, so that the current collector has a larger opening area for the electrolyte to flow, and effectively ensures that the electrolyte can enter the inside of the winding core, thereby enhancing the wetting effect of the electrode and accelerating the injection efficiency of the electrolyte; on the other hand, it can also effectively ensure the structural strength of the current collector 100, and avoid the problem of low structural strength of the local position of the current collector 100 due to the scattered opening of the through holes 101.

[0035] Exemplarily, the plane of the current collector 100 is circular, so that it can have a larger contact area with the top surface of the winding core after winding.

[0036] In some embodiments, Figure 2As shown, the distance between the midpoints of two adjacent through holes 101 in the same through hole group 110 is equal. This arrangement can improve the arrangement uniformity of all through holes 101 in the same through hole group 110, thereby further improving the structural strength in the arrangement area corresponding to the through hole group 110.

[0037] Figure 2 The fourth through hole group 105 is used as an example. The fourth through hole group 105 includes three through holes 101, wherein the distance between the middle points of two adjacent through holes 101 is D1, and the distance between the middle points of two adjacent through holes 101 is D2, and D1=D2.

[0038] In some embodiments, Figure 2 As shown, the distance between the midpoints of two adjacent through holes 101 in the same through hole group 110 is M1, and the center point of each through hole 101 in the through hole group 110 is located at a circular arc segment (the circular arc segment is as shown in FIG. Figure 2 The center of the arc segment coincides with the center of the current collector 100, and both ends of the arc segment are connected to the boundary 111 of the reference opening area. The extension line of the boundary 111 of the reference opening area passes through the center of the current collector 100. The length of the arc segment is M2, 1 / 7≤M1 / M2≤1 / 5.

[0039] This arrangement can prevent the spacing between the center points of two adjacent through holes 101 from being too large, which would affect the efficiency of the electrolyte entering the core through the through hole 101. It can also prevent the spacing between the center points of two adjacent through holes 101 from being too small, which would weaken the structural strength of the reference opening area.

[0040] In some examples, M1 / M2 may be 1 / 7, 1 / 6, or 1 / 5, etc.

[0041] In some embodiments, Figure 2 As shown, the reference opening area is provided with a plurality of arrangement areas arranged in a direction away from the center point O of the current collector 100 , each arrangement area is in a fan ring shape and corresponds to a through hole group 110 .

[0042] Figure 2 Four arrangement areas are shown, which are a first arrangement area 12 corresponding to the first through hole group 102, a second arrangement area 13 corresponding to the second through hole group 103, a third arrangement area 14 corresponding to the third through hole group 104, and a fourth arrangement area 15 corresponding to the fourth through hole group 105.

[0043] Among them, all through holes 101 in each through hole group 110 are evenly arranged in the layout area corresponding to the through hole group 110. That is, the distance between the center points of two adjacent through holes 101 in the through hole group 110 is equal to the distance between the layout area boundary and the center point of the through hole closest to the layout area boundary. Figure 2 As shown, for the fourth arrangement area 15 , the distance between one boundary thereof and the center point of the through hole closest to the boundary is D3 , and D3 = D2 .

[0044] Such an arrangement can improve the uniformity of the through holes 101 in the arrangement area, thereby being more conducive to improving the structural strength of the current collector 100 in the arrangement area.

[0045] In some examples, the boundaries of each layout area at both ends in its extension direction overlap with the boundary 111 of the reference opening area. When the boundaries 111 on both sides of the reference opening area are adjacent to the welding area 20, the boundaries on both sides of the layout area are also adjacent to the welding area 20.

[0046] Therefore, for all through holes 101 in the same through hole group 110, they are arranged in a circular array about the center point O of the current collector 100, and the angle range of the arrangement of the circular array is less than or equal to the fan-shaped angle range corresponding to the reference opening area. Through this arrangement, the distribution uniformity of the through holes 101 in the same through hole group 110 can be effectively guaranteed, thereby ensuring the structural strength of the current collector 100 in the arrangement area corresponding to the through hole group 110.

[0047] In some embodiments, Figure 2 As shown, the cross section of the through hole 101 in the plane direction of the current collector 100 is circular, and the plane direction is perpendicular to the thickness direction of the current collector 100. By providing a circular through hole 101, the difficulty of processing and manufacturing the through hole 101 can be reduced, which helps to improve the manufacturing stability.

[0048] In some embodiments, Figure 2 As shown, the minimum spacing distance between two adjacent through-hole groups 110 is D4, and the ratio of the diameter L1 of the through-hole 101 to the minimum spacing distance D4 is greater than or equal to 0.25 and less than or equal to 0.5.

[0049] This arrangement can ensure that the minimum spacing distance between adjacent through-hole groups 110 and the size of the through-hole 101 are relatively reasonable. This avoids the problem that the minimum spacing distance between the through-hole groups 110 is too small when the through-holes are set larger, thereby causing the structural strength of the current collector 100 to be weak; on the other hand, it also avoids the problem that the minimum spacing distance between the through-hole groups 110 is too large when the through-holes are set smaller, thereby causing the efficiency of the electrolyte entering the core to be too low.

[0050] It should be noted that the minimum spacing distance D4 between two adjacent through-hole groups 110 refers to the distance between the hole walls of the two through-holes 101 that are closest to each other in the two adjacent through-hole groups 110 .

[0051] For example, Figure 2 As shown, for the third through hole group 104 and the fourth through hole group 105 , the minimum spacing distance therebetween may refer to the distance between the hole walls of two through holes 101 closest to the same side boundary of the third arrangement area 14 and the fourth arrangement area 15 .

[0052] In some examples, the ratio of the diameter L1 of the through hole 101 to the minimum spacing distance D4 may be 0.25, 0.3, 0.35, 0.4, 0.45, or 0.5, etc.

[0053] In some examples, the minimum spacing distance D4 between two adjacent through-hole groups 110 is greater than or equal to 1 mm and less than or equal to 10 mm.

[0054] This arrangement can ensure that there is a certain distance between adjacent through hole groups 110, thereby avoiding the problem that the spacing between the through holes 101 in adjacent through hole groups 110 is too small, which leads to weak structural strength of the current collector 100 at this position, and on the other hand, avoiding the problem that the spacing between adjacent through hole groups 110 is too large, which makes the area of ​​all through holes 101 too small and affects the efficiency of the electrolyte entering the interior of the core through the through holes 101.

[0055] In some examples, the minimum spacing distance D4 between two adjacent through-hole groups 110 may be 1 mm, 3 mm, 5 mm, 7 mm, 8 mm, or 10 mm.

[0056] In some examples, the center points of some through holes 101 in different through hole groups 110 may be located on a straight line passing through the center point O of the current collector 100 , which helps to improve the arrangement uniformity of the through holes 101 .

[0057] For example, for a plurality of sequentially adjacent through-hole groups 110 , the center point of each through-hole 101 is located on a straight line passing through the center point O of the current collector 100 . For example, Figure 2 The center points of the through holes 101 in the middle of the second through hole group 103 , the third through hole group 104 and the fourth through hole group 105 are all located on a straight line passing through the center point O of the current collector 100 .

[0058] Exemplarily, the center points of the through holes of all through hole groups 110 closest to the same side boundary of the corresponding arrangement area are located on a straight line passing through the center point O of the current collector 100. For example, Figure 2The center points of the through holes 101 located on the same side in the first through hole group 102 , the second through hole group 103 , the third through hole group 104 and the fourth through hole group 105 are all located on a straight line passing through the center point O of the current collector 100 .

[0059] In some examples, the ratio of the diameter L1 of the through hole 101 to the diameter L2 of the current collector 100 is greater than or equal to 0.02 and less than or equal to 0.15. This arrangement ensures that the through hole 101 has a larger area, which is convenient for process manufacturing, and on the other hand, it can also prevent the through hole 101 from having a larger diameter, which may have a greater impact on the structural strength of the current collector 100; in addition, the above ratio range can also ensure that the through hole 101 has a larger area on the current collector 100, thereby effectively ensuring that the electrolyte can enter the interior of the winding core, enhancing the wetting effect of the pole piece and accelerating the injection efficiency of the electrolyte.

[0060] Exemplarily, the ratio of the diameter L1 of the through hole 101 to the diameter L2 of the current collector 100 can be 0.02, 0.04, 0.06, 0.08, 0.1, 0.12, 0.14, 0.15, etc. The above values ​​are only for example, and the ratio of L1 and L2 is not limited to the above-mentioned values, as long as the ratio is within the range of 0.02 and 0.15.

[0061] In some examples, the diameter L1 of the through hole 101 may be greater than or equal to 0.5 mm and less than or equal to 2.5 mm. For example, the diameter L1 of the through hole 101 may be 0.5 mm, 1 mm, 1.5 mm, 2 mm or 2.5 mm, etc. By setting the diameter L1 of the through hole 101 within the above range, it is possible to ensure that the through hole 101 has a larger area, thereby facilitating process manufacturing, and on the other hand, it is possible to avoid the through hole 101 having a large diameter, which may cause a greater impact on the structural strength of the current collector 100.

[0062] In some embodiments, Figure 2 As shown, an edge opening group 16 is further provided in the reference opening area, and the edge opening group 16 includes at least one edge opening 106 . The cross section of the edge opening 106 in the plane direction of the current collector 100 is semicircular, and the diameter of the edge opening 106 is the same as the diameter of the through hole 101 .

[0063] By setting the diameter of the edge opening 106 to be consistent with the through hole 101, it is convenient to open the edge opening 106. In addition, the edge opening 106 is used to help load the current collector 100 onto the automatic line, thereby improving its processing efficiency; on the other hand, it also allows the electrolyte to enter the core from the side opening, thereby enhancing the wetting effect of the electrode and accelerating the electrolyte injection efficiency.

[0064] Exemplarily, the concave direction of the edge opening 106 is toward the center point O of the current collector 100 .

[0065] In some embodiments, the edge opening group 16 includes a plurality of edge openings 106 , and a center point of one edge opening 106 corresponds to a center point of one through hole 101 of each through hole group 110 in the plurality of through hole groups 110 and a center point O of the current collector 100 on the same straight line.

[0066] This arrangement can, on the one hand, effectively ensure the structural strength of the current collector 100, and on the other hand, ensure the uniformity of the arrangement of the edge openings 106, thereby improving the effect of the electrolyte entering the interior of the winding core from the side openings, thereby enhancing the wetting effect of the electrode and accelerating the electrolyte injection efficiency.

[0067] In some examples, the center points of the central through holes 101 in the second through hole group 103 , the third through hole group 104 , and the fourth through hole group 105 and the center points of the central edge openings 106 in the edge opening group 16 are located on a straight line passing through the center point O of the current collector 100 .

[0068] In some examples, the center points of the through holes 101 located on the same side in the first through hole group 102, the second through hole group 103, the third through hole group 104 and the fourth through hole group 105 and the center points of the edge openings 106 located on the same side in the edge opening group 16 are located on a straight line passing through the center point O of the current collector 100.

[0069] In some embodiments, Figure 2 As shown, all the opening areas 10 are reference opening areas, which can not only ensure the structural strength of the current collector 100 but also further improve the effect of the electrolyte entering the inner part of the winding core, thereby enhancing the wetting effect of the electrode sheet and accelerating the injection efficiency of the electrolyte.

[0070] In some embodiments, Figure 2 As shown, the current collector 100 also has a plurality of first welding areas 20 arranged around the center point O of the current collector 100, each first welding area 20 is in a fan ring shape, and each first welding area 20 is adjacent to two adjacent opening areas 10. In this case, each first welding area 20 shares the same boundary with the adjacent opening areas 10.

[0071] With such an arrangement, the first welding area 20 can be fan-shaped, so that it can have a better welding surface, thereby better welding with the pole ear of the winding core after winding; in addition, the fan-shaped first welding area 20 can also flexibly select welding shapes, such as strip or spiral welding shapes, thereby increasing the welding tolerance rate.

[0072] In some embodiments, Figure 1As shown, the current collector 100 includes a protruding portion 21 located in the first welding area 20 and a planar portion 17 located in the opening area 10 . The protruding portion 21 has a welding surface 210 , and the planar portion 17 has a reference surface 170 disposed on the same side as the welding surface 210 .

[0073] like Figure 3 As shown, the vertical distance H between the plane where the welding surface 210 is located and the plane where the reference surface 170 is located is greater than or equal to 0.05 mm and less than or equal to 0.2 mm. That is, the welding surface 210 and the reference surface 170 are located at different heights, and the height difference is greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

[0074] With this arrangement, an air chamber space can be formed between the protrusion 21 and the winding core, so that the gas inside the battery is accumulated in the air chamber space, thereby facilitating the opening of the battery valve to release pressure.

[0075] In some examples, the vertical distance H between the plane where the welding surface 210 is located and the plane where the reference surface 170 is located can be 0.05 mm, 0.1 mm, 0.15 mm, or 0.2 mm, etc.

[0076] In some examples, the fan-shaped angles of the first welding area 20 and the opening area 10 may be equal or different, and the present application does not limit them. For example, the fan-shaped angle of the first welding area 20 may be greater than or equal to 30° and less than or equal to 80°; the fan-shaped angle of the opening area 10 may be greater than or equal to 30° and less than or equal to 80°. Of course, the present application does not limit the number of the first welding area 20 and the opening area 10.

[0077] In some embodiments, Figure 2 As shown, the current collector 100 further has a second welding area 30 . The center point O of the current collector 100 is located in the second welding area 30 , and the second welding area 30 is adjacent to the plurality of opening areas 10 and the plurality of first welding areas 20 .

[0078] The first welding area 20 can be used for welding with the pole lug of the winding core, and the second welding area 30 is used for welding with the battery shell, so that the current can be extracted or imported into the battery.

[0079] In some examples, the second welding area 30 may be arranged in a circular shape, and the edges of the circle are adjacent to the opening area 10 and the first welding area 20 respectively.

[0080] In some embodiments, Figure 2 As shown, the ratio of the total area of ​​the plurality of opening regions 10 to the area of ​​the current collector 100 is greater than or equal to 0.35 and less than or equal to 0.65, which is beneficial to ensure that the through hole 101 has a larger opening area, thereby facilitating the smooth entry of the electrolyte into the core.

[0081] In some examples, the ratio of the total area of ​​the plurality of first welding areas 20 and the second welding areas 30 to the area of ​​the current collector 100 is greater than or equal to 0.35 and less than or equal to 0.65, which is beneficial in ensuring a larger welding area between the current collector 100 and the winding core and the shell, thereby improving the welding stability of the current collector 100.

[0082] Some embodiments of the present application also provide a battery, such as Figure 4 As shown, the battery 200 includes the current collector 100 described in any of the above embodiments.

[0083] 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.

[0084] 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 first welding area of ​​the current collector 100 can be used to weld to the electrode tab of the positive electrode sheet, and the second welding area of ​​the current collector 100 can be used to weld to the shell.

[0085] 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 has a plurality of opening areas arranged around the center point of the current collector, at least one of the opening areas is a reference opening area, the reference opening area is fan-shaped, and a through-hole set is provided in the reference opening area, the through-hole set includes a plurality of through-hole groups arranged in a direction away from the center point of the current collector, each of the through-hole groups includes a plurality of through-holes arranged along the thickness direction of the current collector, and each of the through-holes in the same through-hole group is at an equal distance from the center point of the current collector.

2. The current collector according to claim 1, characterized in that: The distances between the center points of two adjacent through holes in the same through hole group are equal.

3. The current collector according to claim 2, characterized in that: The distance between the center points of two adjacent through holes in the same through hole group is M1, the center point of each through hole in the through hole group is located on an arc segment, the center of the arc segment coincides with the center point of the collector, the two ends of the arc segment are connected to the boundary of the reference opening area, the length of the arc segment is M2, 1 / 7≤M1 / M2≤1 / 5.

4. The current collector according to claim 1, characterized in that: The cross section of the through hole in the plane direction of the current collector is circular, and the ratio of the diameter of the through hole to the minimum spacing distance between two adjacent through hole groups is greater than or equal to 0.25 and less than or equal to 0.

5.

5. The current collector according to claim 1, characterized in that: The cross section of the through hole in the plane direction of the current collector is circular, and the ratio of the diameter of the through hole to the diameter of the current collector is greater than or equal to 0.02 and less than or equal to 0.

15.

6. The current collector according to any one of claims 1 to 5, characterized in that: An edge opening group is also provided in the reference opening area, and the edge opening group includes at least one edge opening, the cross section of the edge opening in the plane direction of the current collector is semicircular, and the diameter of the edge opening is the same as the diameter of the through hole.

7. The current collector according to claim 6, characterized in that: The edge opening group includes a plurality of edge openings, and a center point of one edge opening corresponds to a center point of one through hole in each through hole group and a center point of the current collector on the same straight line.

8. The current collector according to any one of claims 1 to 5, characterized in that: The current collector also has a plurality of first welding areas arranged around the center point of the current collector, each of the first welding areas is in a fan ring shape and is adjacent to two adjacent opening areas.

9. The current collector according to claim 8, characterized in that: The current collector includes a raised portion located in the first welding area and a planar portion located in the opening area, the raised portion has a welding surface, the planar portion has a reference surface arranged on the same side as the welding surface, and the vertical distance between the plane where the welding surface is located and the plane where the reference surface is located is greater than or equal to 0.05 mm and less than or equal to 0.2 mm.

10. The current collector according to claim 8, characterized in that: The current collector further has a second welding area, the center point of the current collector is located in the second welding area, and the second welding area is adjacent to the plurality of opening areas and the plurality of the first welding areas; and / or The ratio of the total area of ​​the plurality of open areas to the area of ​​the current collector is greater than or equal to 0.35 and less than or equal to 0.

65.

11. A battery, characterized in that: include: The current collector according to any one of claims 1 to 10.

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