Current collector disc and cylindrical battery

Abstract

The present application provides a current collector disc and a cylindrical battery. The current collector disc comprises a disc body portion adapted to be connected to a battery cell; the disc body portion is provided with one or more electrolyte permeation through holes; the area of any end surface of the disc body portion in the thickness direction thereof is S1, the sum of the areas of the liquid permeation through holes is S2, and S2 / (S1+S2)<0.04. The current collector disc may be further provided with a connection portion, the connection portion comprises a first corner section and a second corner section, and in a flattened state, the first corner section and the second corner section are both arc-shaped. The current collector disc may be further provided with wrapping portions, and the wrapping portions wrap bend portions of the current collector disc. The structural strength of the disc body portion of the current collector disc is relatively high, and the risk of cracking at the bend portions of the current collector disc is relatively low.

Description

Collector and cylindrical battery Technical Field

[0001] This application relates to the field of battery technology, and in particular to a current collector and a cylindrical battery. Background Technology

[0002] In cylindrical batteries, the current collector is used to achieve electrical connection between the cell and the terminals. Both the terminals and the cell's tabs are welded to the current collector. During the assembly of a cylindrical battery, the current collector and cell are typically placed into the battery casing first, and then electrolyte is injected into the casing. In existing technology, to facilitate electrolyte injection and contact with the cell, the current collector's disc portion (the part used to connect with the cell) has leakage holes through which the electrolyte can pass.

[0003] However, too many or too large leakage through-holes will reduce the structural strength of the disc section. This makes the disc section prone to denting during battery assembly. Furthermore, after the battery is impacted, the disc section is also prone to denting and damage, leading to battery failure. Summary of the Invention

[0004] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a current collector plate with high structural strength.

[0005] This application also proposes a cylindrical battery including the aforementioned collector disk.

[0006] According to a first aspect embodiment of the present application, a current collector includes a disk body portion for connecting with a battery cell. The disk body portion is provided with one or more leakage through holes. The area of ​​any end face of the disk body portion in its thickness direction is S1, and the sum of the areas of the leakage through holes is S2, where S2 / (S1+S2)<0.04.

[0007] The current collector according to the first aspect embodiment of this application has at least the following beneficial effects: S2 / (S1+S2)<0.04 can prevent the opening area of ​​the plate body from being too large, thereby improving the structural strength of the plate body. At the same time, this arrangement allows for a larger area of ​​the plate body to be used for connection with the battery cell.

[0008] According to some embodiments of this application, the seepage through hole is a circular hole with a diameter of D, where 1mm ≤ D ≤ 2mm.

[0009] According to some embodiments of this application, the current collector further includes a connecting portion, extending from one end of the connecting portion near the disk body to the other end of the connecting portion away from the disk body. The connecting portion sequentially includes a first corner segment, a first stacked segment, a second corner segment, and a second stacked segment, the second stacked segment being used to connect with the electrode post. When the current collector is in a bent state, the disk body, the first stacked segment, and the second stacked segment are stacked on top of each other. The disk body includes a first surface and a second surface facing each other, the first surface facing the battery cell and the second surface facing the electrode post. When the current collector is in a flattened state, both the first corner segment and the second corner segment are arc-shaped, the first corner segment protruding relative to the first surface and the second corner segment protruding relative to the second surface.

[0010] According to some embodiments of this application, the first stacked segment, the second stacked segment, and the disk portion are all flat, the thickness of the first stacked segment, the second stacked segment, and the disk portion is H, the radius of the first corner segment is R1, the radius of the second corner segment is R2, R1>H, and R2>H.

[0011] According to some embodiments of this application, the collector plate further includes a connecting portion, extending from one end of the connecting portion near the plate body to the end of the connecting portion away from the plate body. The connecting portion sequentially includes a first corner segment, a first stacked segment, a second corner segment, and a second stacked segment, wherein the second stacked segment is used to connect to the pole post. The collector plate also includes two wrapping portions spaced apart from each other. The wrapping portions are flexible, with one wrapping portion wrapping the first corner segment and the other wrapping portion wrapping the second corner segment. When the collector plate is in a bent state, the plate body, the first stacked segment, and the second stacked segment are stacked on top of each other.

[0012] According to some embodiments of this application, the collector plate further includes a connecting portion, extending from one end of the connecting portion near the plate body to the other end of the connecting portion away from the plate body. The connecting portion sequentially includes a first corner segment, a first stacked segment, a second corner segment, and a second stacked segment, wherein the second stacked segment is used to connect to the pole post. The collector plate further includes a wrapping portion, which is flexible and wraps the first corner segment, the first stacked segment, and the second corner segment. When the collector plate is in a bent state, the plate body, the first stacked segment, and the second stacked segment are stacked on top of each other.

[0013] According to some embodiments of this application, the wrapping part is adhesive tape; or, the wrapping part is made of an elastic material.

[0014] According to some embodiments of this application, the outer edge of the disk portion includes an arc edge, a first straight edge, and a second straight edge. The central angle corresponding to the arc edge is greater than 180°. The two ends of the arc edge are respectively connected to the first straight edge portion and the second straight edge portion. The first straight edge and the second straight edge are located on the same straight line, which is a secant of the circle containing the arc edge. The collector disk also includes a connecting portion. One end of the connecting portion is connected to the first straight edge portion and the second straight edge portion, and the other end of the connecting portion is used to connect to the pole post.

[0015] According to some embodiments of this application, there are multiple seepage through holes, one of which is a central through hole and the rest are peripheral through holes. The central through hole is located at the center of the disk body, and the peripheral through holes are arranged around the central through hole. For any two peripheral through holes, the peripheral through hole that is farther away from the first straight edge has a larger area.

[0016] A cylindrical battery according to a second aspect of this application includes a casing; a current collector as described in the first aspect embodiment, the current collector being disposed within the casing; a battery cell, the battery cell being disposed within the casing and connected to the current collector portion; and a terminal post, a portion of which protrudes outside the casing; wherein the terminal post is connected to the current collector portion; or, the current collector further includes a connecting portion, the connecting portion being bent, one end of the connecting portion being connected to the current collector portion, and the terminal post being connected to the other end of the connecting portion.

[0017] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0018] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:

[0019] Figure 1 is a cross-sectional view of the battery according to the first embodiment of this application;

[0020] Figure 2 is a top view of the collector plate of the first embodiment;

[0021] Figure 3 is a schematic diagram of the end face area S1 of the disk body;

[0022] Figure 4 is a perspective view of the collector plate of the first embodiment;

[0023] Figure 5 is a front view of the collector plate in the first embodiment;

[0024] Figure 6 is a perspective view of the manifold of the second embodiment of this application;

[0025] Figure 7 is a top view of the collector plate in the second embodiment;

[0026] Figure 8 is a perspective view of the manifold of the third embodiment of this application;

[0027] Figure 9 is a top view of the collector plate in the third embodiment;

[0028] Reference numerals: 101-Current collector, 102-Disc body, 103-Connecting part, 104-First corner segment, 105-First stacked segment, 106-Second corner segment, 107-Second stacked segment, 108-Leakage through hole, 109-First peripheral through hole, 110-Second peripheral through hole, 111-Third peripheral through hole, 112-Center through hole, 113-Circular edge, 114-First straight edge, 115-Second straight edge, 116-Second surface, 117-First surface, 118-Wrapping part, 119-Cylindrical battery, 120-Outer shell, 121-Cylinder body, 122-Cover plate, 123-Terminal post, 124-Cell, 125-Center space, 126-Fourth peripheral through hole. Detailed Implementation

[0029] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.

[0030] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0031] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0032] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.

[0033] Figure 1 illustrates a cylindrical battery 119 according to a first embodiment of this application. The cylindrical battery 119 includes a casing 120, a current collector 101, a battery cell 124, and terminals 123. The casing 120 includes a cylindrical body 121 and a cover plate 122, which can be welded to one end of the body 121. The battery cell 124 is cylindrical and is a wound battery cell. The battery cell 124 and the current collector 101 are disposed inside the casing 120, and the battery cell 124 is connected to the disk portion 102 of the current collector 101 (e.g., by welding). The terminals 123 are riveted to the cover plate 122, and a portion of the terminals 123 protrudes outside the casing 120. The portion of the terminals 123 located inside the casing 120 is connected to the connection portion 103 of the current collector 101 (e.g., by welding).

[0034] It should be noted that the cylindrical battery 119 may also include an electrolyte and an insulating component (not shown), and the top cover may also have an injection hole (not shown). The electrolyte can enter the interior of the casing through the injection hole, and after injection, the injection hole is sealed. The insulating component is fitted over the outside of the terminal 123 and separates the terminal 123 from the cover plate 122 to prevent direct conductivity between the terminal 123 and the cover plate 122. The positive electrode tab of the cell 124 can be welded to the current collector 101, and the negative electrode tab of the cell 124 can be directly welded to the bottom end of the cylinder 121. The bottom end of the cylinder 121 can serve as the negative electrode of the cylindrical battery 119, and the terminal 123 serves as the positive electrode of the cylindrical battery 119.

[0035] Figures 2 to 5 illustrate a current collector 101 according to a first embodiment of this application. The current collector 101 includes a disk body 102 for connection to a battery cell 124. More specifically, the disk body 102 is used for welding to the tabs of the battery cell 124 (tabs not shown). As shown in Figure 2, the disk body 102 has a plurality of leakage through holes 108. When the cylindrical battery 119 is filled with electrolyte, the leakage through holes 108 allow the electrolyte to pass through, thereby allowing the electrolyte to contact and penetrate into the battery cell 124. The area of ​​any end face of the disk body 102 in its thickness direction is S1, and the sum of the areas of the leakage through holes 108 is S2. S1 and S2 satisfy: S2 / (S1+S2)<0.04. This formula is also equivalent to S2<S1 / 24. This arrangement can prevent the opening area of ​​the disk body 102 from being too large, thereby improving the structural strength of the disk body 102. At the same time, this design allows for a larger area of ​​the disc body 102 that can be used for welding to the electrode tabs.

[0036] S1 and S2 will be explained below. The thickness direction of the disk portion 102 is also the axial direction of the disk portion 102. Referring to Figures 2 and 5, in the first embodiment, the thickness direction of the disk portion 102 is the up-down direction. The two end faces of the disk portion 102 in its own thickness direction are the upper surface and the lower surface of the disk portion 102, respectively, which are the first surface 117 and the second surface 116 in Figure 5. The first surface 117 and the second surface 116 have the same shape and size, so the area of ​​the first surface 117 and the second surface 116 is S1. As shown in Figure 3, the area filled with the shaded line is S1, and the area filled with the shaded line can be used for welding with the electrode tab.

[0037] The area of ​​a single seepage hole 108 refers to the area enclosed by the outer edge of the seepage hole 108 when the disk body 102 is viewed along its thickness direction. For example, in Figure 3, to reduce the machining difficulty of the collecting disk 101, the seepage hole 108 is a circular hole; the diameter of the seepage hole 108 is D (not marked in the figure), and the area of ​​a single seepage hole 108 is equal to πD. 2 / 4. The sum of the areas of the seepage holes 108 is the sum of the areas of all seepage holes 108. For example, assuming that the disc body 102 has four seepage holes 108 of the same size, then S2 = πD 2 .

[0038] It should be noted that, in addition to circular holes, the seepage through holes 108 can also be rectangular, hexagonal, or other shapes, as long as the electrolyte can pass through them. In some embodiments not shown, the disc body 102 may also have only one seepage through hole 108. When the disc body 102 has two or more seepage through holes 108, all seepage through holes can be the same in size and shape; or, different seepage through holes 108 can be different in at least one aspect of size and shape.

[0039] When the seepage through-hole 108 is a circular hole, the diameter D of the seepage through-hole 108 can satisfy: 1mm ≤ D ≤ 2mm. D greater than or equal to 1mm can prevent a single seepage through-hole 108 from being too small, thereby ensuring that the electrolyte can pass through the seepage through-hole 108 smoothly. D less than or equal to 2mm can prevent a single seepage through-hole 108 from being too large, thereby preventing the local strength of the disk body 102 from being too low.

[0040] As shown in Figure 2, the disk body 102 is also provided with multiple leakage through holes 108, one of which is a central through hole 112, and the remaining leakage through holes 108 are peripheral through holes. The central through hole 112 is located at the center of the disk body 102, and the center of the central through hole 112 coincides with the center of the circle containing the arc edge 113 of the disk body 102. The leakage through holes 108 are arranged around the central through hole 112. In the cylindrical battery 119, the cell 124 is a wound cell 124 and is cylindrical. The central through hole 112 is aligned with the central space 125 of the cell 124, and the diameter of the central through hole 112 matches the diameter of the central space 125 of the cell 124 (as shown in Figure 1). The electrolyte passing through the central through hole 112 mainly enters the central space 125.

[0041] As shown in Figure 3, the collector plate 101 also includes a connecting portion 103. One end of the connecting portion 103 is connected to the plate body portion 102, and the other end of the connecting portion 103 is used to connect to the pole post 123. The outer edge of the plate body portion 102 includes an arc edge 113, a first straight edge 114, and a second straight edge 115. The central angle corresponding to the arc edge 113 is greater than 180°, and the two ends of the arc edge 113 are connected to the first straight edge 114 and the second straight edge 115, respectively. The first straight edge 114 and the second straight edge 115 are located on the same straight line, and this straight line is a secant of the circle containing the arc edge 113. In the cylindrical battery 119, the connecting part 103 is bent (as shown in Figure 1). The inner circumferential surface of the outer shell 120 of the cylindrical battery 119 matches the arc edge 113. A gap can be formed between the first straight edge 114 and the second straight edge 115 and the inner circumferential surface of the outer shell 120. This gap can accommodate the junction of the connecting part 103 and the disk part 102 (i.e., the first corner segment 104, which will be introduced below), thereby facilitating the bending of the connecting part 103 and facilitating the placement of the current collector 101 into the outer shell 120.

[0042] The direction perpendicular to the plane of the paper in Figure 3 is the thickness direction of the disk body 102. As shown in Figure 3, for any two peripheral through holes, the peripheral through hole farther from the first straight edge 114 has a larger area. For example, the four peripheral through holes are the first peripheral through hole 109, the second peripheral through hole 110, the third peripheral through hole 111, and the fourth peripheral through hole 126. In the left-right direction, the second peripheral through hole 110 and the fourth peripheral through hole 126 are equidistant from the first straight edge 114, and their areas are the same. In the left-right direction, the distance between the first peripheral through hole 109 and the first straight edge 114 is greater than the distance between the third peripheral through hole 111 and the first straight edge 114, and the area of ​​the first peripheral through hole 109 is greater than the area of ​​the third peripheral through hole 111. In the left-right direction, the distance between the second peripheral through hole 110 and the first straight edge 114 is greater than the distance between the third peripheral through hole 111 and the first straight edge 114 by the same amount, and the area of ​​the second peripheral through hole 110 is greater than the area of ​​the third peripheral through hole 111. More specifically, the diameter of the first peripheral through hole 109 can be 2 mm, the diameters of the second peripheral through hole 110 and the fourth peripheral through hole 126 can be 1.5 mm, and the diameter of the third peripheral through hole 111 can be 1 mm.

[0043] Because a large gap is formed between the inner circumferential surface of the outer casing 120 of the cylindrical battery 119 and the first straight edge 114 and the second straight edge 115, this large gap allows a significant amount of electrolyte to pass through, enabling the electrolyte to permeate into the cell 124. Assuming the permeation hole 108 is not provided, the electrolyte flow rate near the first straight edge 114 is higher, while the electrolyte flow rate at the other end of the disk portion 102 is lower. Therefore, by providing the permeation hole 108, the diameter of the permeation hole 108 near the first straight edge 114 can be appropriately reduced, thereby balancing the electrolyte flow rate in different areas of the disk portion 102, improving the uniformity of electrolyte flow rate in each area of ​​the collector disk 101, and ensuring that the electrolyte can permeate evenly into the cell 124. Therefore, in order to improve the uniformity of electrolyte flow in each region of the manifold 101, in this embodiment, the peripheral through holes closer to the first straight edge 114 are smaller, and the electrolyte flow in the peripheral through holes closer to the first straight edge 114 is smaller; the peripheral through holes farther from the first straight edge 114 are larger, and the electrolyte flow in the peripheral through holes farther from the first straight edge 114 is larger.

[0044] As shown in Figure 2, in the first embodiment, from the end of the connecting portion 103 near the disk body portion 102 to the end of the connecting portion 103 away from the disk body portion 102, the connecting portion 103 sequentially includes a first corner segment 104, a first stacked segment 105, a second corner segment 106, and a second stacked segment 107. As shown in Figure 1, the second stacked segment 107 is used to connect with the electrode post 123. When the current collector 101 is in a bent state, the disk body portion 102, the first stacked segment 105, and the second stacked segment 107 are stacked on top of each other. As shown in Figure 5, the disk body portion 102 includes a first surface 117 and a second surface 116 facing each other. The first surface 117 faces the cell 124 (first surface 117 facing down), and the second surface 116 faces the electrode post 123 (second surface 116 facing up). When the collector plate 101 is in a flattened state, both the first corner segment 104 and the second corner segment 106 are arc-shaped. The first corner segment 104 protrudes relative to the first surface 117, and the second corner segment 106 protrudes relative to the second surface 116.

[0045] During the assembly of the cylindrical battery 119, the connecting portion 103 of the current collector 101 needs to be bent, thereby changing the current collector 101 from a flat state to a bent state. In this application, the current collector 101 being in a flat state means that the first stacked segment 105, the second stacked segment 107, and the disk body 102 are on the same plane. If, in the flat state (as shown in Figure 5), the first corner segment 104 and the second corner segment 106 are both flat, then after bending the connecting portion 103 of the current collector 101, the junctions of the first stacked segment 105 and the disk body 102, and the junctions of the second stacked segment 107 and the first stacked segment 105, are prone to excessive bending. The metal fatigue caused by excessive bending makes the above two junctions prone to cracking.

[0046] In this embodiment, since the first corner segment 104 and the second corner segment 106 were already arc-shaped before the connecting portion 103 was bent, the shape change of the first corner segment 104 itself is small after the connecting portion 103 is bent (basically maintaining an arc shape), and the shape change of the second corner segment 106 itself is also small (basically maintaining an arc shape). Therefore, the junction of the first stacked segment 105 and the disc portion 102, and the junction of the second stacked segment 107 and the first stacked segment 105 are not excessively bent, and the above two junctions are not prone to cracking due to excessive bending.

[0047] The first stacked segment 105, the second stacked segment 107, and the disk portion 102 are all flat. The thickness of the first stacked segment 105, the second stacked segment 107, and the disk portion 102 is H. The radius of the first corner segment 104 is R1, and the radius of the second corner segment 106 is R2, where R1 > H and R2 > H. The aforementioned thicknesses and radii are not shown in the accompanying drawings. Taking Figure 5 as an example, the thickness direction is the up-down direction, and the thickness of the first stacked segment 105 refers to the dimension of the first stacked segment 105 in the up-down direction. The thickness of the second stacked segment 107 is defined similarly to the thickness of the disk portion 102, and will not be repeated here. The radius of the first corner segment 104 refers to the radius of the concave side surface of the first corner segment 104. For example, as shown in Figure 5, the first corner segment 104 protrudes downwards, and its upper side is a concave side. The upper surface of the first corner segment 104 is a concave arc surface, and the radius of this concave arc surface is R1. Similarly, the radius R2 of the second corner segment 106 refers to the radius of the concave side surface of the second corner segment 106, that is, the radius of the lower arc surface of the second corner segment 106. R1 > H and R2 > H ensure that the first corner segment 104 and the second corner segment 106 have a large protrusion distance, thereby guaranteeing the crack-resistant effect of the first corner segment 104 and the second corner segment 106.

[0048] Figures 6 and 7 illustrate the current collector 101 according to the second embodiment of this application. The main difference between the second embodiment and the first embodiment is that the second embodiment further includes a wrapping portion 118. The wrapping portion 118 is flexible, and the second embodiment reduces the risk of cracking at the bending point of the current collector 101 through the wrapping portion 118. Referring to Figures 6 and 7, there are two wrapping portions 118, one wrapping portion 118 wrapping the first corner segment 104 and the other wrapping portion 118 wrapping the second corner segment 106. The wrapping portion 118 wrapping the corner segment means that the wrapping portion 118 surrounds the corner segment at least once. When the current collector 101 of the second embodiment is in a bent state, its disk body portion 102, the first stacked segment 105 and the second stacked segment 107 are also stacked on top of each other, and their stacking method is the same as that of the first embodiment (refer to Figure 1). The connection method between the current collector 101 and the pole post 123 and the cell 124 is also the same as that of the first embodiment. Since the wrapping part 118 wraps the bent part of the collector plate 101, the bent part of the collector plate 101 is supported and restrained by flexible material. This avoids metal fatigue caused by excessive bending of the bent part, thereby reducing the risk of cracking of the bent part of the collector plate 101.

[0049] To improve the support effect of the wrapping portion 118 on the bent portion of the manifold 101, the wrapping portion 118 wrapping the first corner segment 104 can also wrap one end of the first stacked segment 105, and the wrapping portion 118 wrapping the second corner segment 106 can also wrap the other end of the first stacked segment 105 and a portion of the second stacked segment 107. To further enhance the support effect of the wrapping portion 118 on the bent portion of the manifold 101, in some embodiments, the wrapping portion 118 can be made of an elastic material, such as TPE (Thermoplastic Elastomer), rubber, etc. The elasticity of the elastic material helps to enhance the support and restraint of the wrapping portion 118 on the bent portion of the manifold 101. In other embodiments, to reduce costs and the processing difficulty of the manifold 101, the wrapping portion 118 can also be made of adhesive tape.

[0050] When the package 118 is provided, the first corner section 104 and the second corner section 106 can be flat or curved when the collector plate 101 is in a flat state.

[0051] Figures 8 and 9 illustrate a collector plate 101 according to a third embodiment of this application. The collector plate 101 of the third embodiment is similar to that of the second embodiment, with the main difference being the number of wrapping portions 118. In the third embodiment, only one wrapping portion 118 is provided, and this portion wraps both a corner segment and a second corner segment 106. Due to the supporting and binding effect of the wrapping portion 118, the risk of cracking at the bending portion of the collector plate 101 in the third embodiment is lower. Furthermore, in the third embodiment, the wrapping portion 118 can also wrap the entire first stacked segment 105 and a portion of the second stacked segment 107.

[0052] It should be noted that in some embodiments not shown, the current collector 101 may only include the disk body 102 without the connecting part 103, and both the terminal post 123 and the cell 124 are connected to the disk body 102. For example, the upper surface of the disk body 102 is welded to the bottom end of the terminal post 123, and the lower surface of the disk body 102 is welded to the tab of the cell 124. In this configuration, the cover plate 122 of the cylindrical battery 119 needs to be provided with both an injection hole and a welding port (not shown in the figures), through which the welding torch tip can pass. During the assembly of the cylindrical battery 119, the terminal post 123 can be connected to the cover plate 122 first, and then the terminal post 123 can be welded to the disk body 102; after the terminal post 123 is welded, the cover plate 122 can be connected to the cylinder 121, and then the disk body 102 can be welded to the tab of the cell 124 through the welding port. After the battery cell 124 is welded to the disk body 102, the weld joint on the cover plate 122 is sealed.

[0053] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

Claims

1. A collector disk, characterized in that, It includes a disc body for connecting to the battery cell, the disc body having one or more leakage through holes, the area of ​​any end face of the disc body in its thickness direction being S1, the sum of the areas of the leakage through holes being S2, and S2 / (S1+S2)<0.

04.

2. The collector disk according to claim 1, characterized in that, The seepage orifice is a circular orifice with a diameter of D, where 1 mm ≤ D ≤ 2 mm.

3. The collector disk according to claim 1, characterized in that, The collector also includes a connecting portion, which extends from one end of the connecting portion near the disk body to the other end of the connecting portion away from the disk body. The connecting portion includes a first corner segment, a first stacked segment, a second corner segment, and a second stacked segment in sequence. The second stacked segment is used to connect to the pole post. When the collector is in a bent state, the disk body, the first stacked segment and the second stacked segment are stacked on top of each other. The disk body includes a first surface and a second surface facing each other. The first surface faces the battery cell, and the second surface faces the electrode post. When the current collector is in a flattened state, both the first corner segment and the second corner segment are arc-shaped. The first corner segment protrudes relative to the first surface, and the second corner segment protrudes relative to the second surface.

4. The collector disk according to claim 3, characterized in that, The first stacked segment, the second stacked segment, and the disk body are all flat. The thickness of the first stacked segment, the second stacked segment, and the disk body is H. The radius of the first corner segment is R1, and the radius of the second corner segment is R2, where R1 > H and R2 > H.

5. The collector disk according to claim 1, characterized in that, The collector also includes a connecting portion, which extends from one end of the connecting portion near the disk body to the other end of the connecting portion away from the disk body. The connecting portion includes a first corner segment, a first stacked segment, a second corner segment, and a second stacked segment in sequence. The second stacked segment is used to connect to the pole post. The collector plate also includes two wrapping parts arranged at intervals between each other. The wrapping parts are flexible, with one wrapping part wrapping the first corner segment and the other wrapping part wrapping the second corner segment. When the collector plate is in a bent state, the plate body, the first stacked segment, and the second stacked segment are stacked on top of each other.

6. The collector disk according to claim 1, characterized in that, The collector also includes a connecting portion, which extends from one end of the connecting portion near the disk body to the other end of the connecting portion away from the disk body. The connecting portion includes a first corner segment, a first stacked segment, a second corner segment, and a second stacked segment in sequence. The second stacked segment is used to connect to the pole post. The collector plate also includes a wrapping part, which is flexible and wraps the first corner segment, the first stacked segment, and the second corner segment. When the collector plate is in a bent state, the plate body, the first stacked segment, and the second stacked segment are stacked on top of each other.

7. The collector disk according to claim 5 or 6, characterized in that, The wrapping part is adhesive tape; or, the wrapping part is made of an elastic material.

8. The collector disk according to claim 1, characterized in that, The outer edge of the disk body includes an arc edge, a first straight edge, and a second straight edge. The central angle corresponding to the arc edge is greater than 180°. The two ends of the arc edge are respectively connected to the first straight edge and the second straight edge. The first straight edge and the second straight edge are located on the same straight line, which is a secant of the circle containing the arc edge. The collector disk also includes a connecting part. One end of the connecting part is connected to the first straight edge and the second straight edge, and the other end of the connecting part is used to connect to the pole post.

9. The collector disk according to claim 8, characterized in that, The liquid seepage through holes are provided in multiple ways, one of which is a central through hole and the rest are peripheral through holes. The central through hole is located at the center of the disk body, and the peripheral through holes are arranged around the central through hole. For any two peripheral through holes, the one that is farther away from the first straight edge has a larger area.

10. A cylindrical battery, characterized in that, include: shell; The collector plate as described in any one of claims 1 to 9, wherein the collector plate is disposed within the housing; A battery cell, wherein the battery cell is disposed within the outer casing and is connected to the disk body portion; A terminal post, a portion of which protrudes outside the housing; The electrode post is connected to the disk body; or the collector disk further includes a connecting part, which is bent and connected at one end to the disk body, and the electrode post is connected to the other end of the connecting part.

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