Current collector disc, cover plate assembly, battery cell, battery module and electric device

Abstract

The present application discloses a current collector disc, a cover plate assembly, a battery cell, a battery module and an electric device. The current collector disc comprises a first connection portion, the first connection portion comprises a connection area adapted for electric connection with a cell, and the width of the connection area is increased from inside to outside in a direction moving away from the geometric center of the current collector disc. According to the current collector disc provided by embodiments of the present application, the connection area with the cell is larger near the edge of the current collector disc, thereby ensuring the connection strength of the current collector disc and the cell, while reducing the connection impedance, which is conducive to improving the working performance of the battery cell.

Description

Collecting plate, cover plate assembly, battery cell, battery assembly and electrical device

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on March 27, 2024, with application number 202420621670.4 and invention name “Collecting plate, cover assembly, battery cell, battery assembly and electrical device”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of battery technology, and in particular to a collecting plate, a cover plate assembly, a battery cell, a battery assembly and an electrical device. Background Art

[0003] In the prior art, in order to achieve electrical connection between the cover plate and the pole core, a current collecting plate is usually provided between the cover plate and the pole core.

[0004] However, when the existing current collecting disc is connected to the pole core, the welding area between the current collecting disc and the outer pole piece of the pole core is small, resulting in reduced connection strength between the current collecting disc and the pole core and increased impedance, which affects the working performance of the battery cell.

[0005] Summary of the Invention

[0006] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the first object of the present application is to provide a current collector disk that can ensure a connection area between the current collector disk and the outer pole piece of the pole core, improve the connection strength between the current collector disk and the pole core, and reduce the connection impedance. This solves the technical problems of the prior art in which the current collector disk and the pole core have small connection area, low connection strength, and high connection impedance.

[0007] The second objective of the present application is to provide a cover plate assembly having the above-mentioned collecting plate.

[0008] A third objective of the present application is to provide a battery cell having the above-mentioned cover plate assembly.

[0009] A fourth objective of the present application is to provide a battery assembly having the above-mentioned battery cell.

[0010] The fifth objective of the present application is to provide an electrical device having the above-mentioned battery assembly.

[0011] According to an embodiment of the current collecting disk of the present application, the current collecting disk includes a first connecting portion, the first connecting portion including a connecting area suitable for electrically connecting to the pole core, and the width of the connecting area increases from the inside to the outside in a direction away from the geometric center of the current collecting disk.

[0012] According to the current collecting disk of the embodiment of the present application, a connection area is provided on the first connection portion, and the width of the connection area is set to increase from the inside to the outside in the direction away from the geometric center of the current collecting disk. In this way, while the current collecting disk is used to realize the electrical connection between the cover plate and the pole core, thereby ensuring the working performance of the battery cell, the connection area and the outer pole piece of the pole core in the direction away from the geometric center of the current collecting disk can have a larger connection area, thereby ensuring the connection area between the current collecting disk and the outer pole piece of the pole core, improving the connection strength between the current collecting disk and the pole core, and reducing the connection impedance at the same time, which is beneficial to improving the working performance of the battery cell.

[0013] In some embodiments, the connection area has a maximum width near the edge of the current collecting disk and a minimum width near the geometric center of the current collecting disk, and the difference between the minimum width and the maximum width ranges from 2 mm to 6 mm.

[0014] In some embodiments, the minimum width ranges from 1 mm to 10 mm.

[0015] In some embodiments, the first connection portion includes a plurality of connection areas, and the plurality of connection areas are spaced apart along the circumference of the collecting plate.

[0016] In some embodiments, there are two connection areas and they are symmetrically arranged relative to the geometric center of the collecting plate.

[0017] In some embodiments, a portion of the collecting plate is bent to define a connection area.

[0018] In some embodiments, the current collecting plate further includes a second connecting portion and an intermediate portion, the second connecting portion is suitable for being electrically connected to the cover plate, and the two ends of the intermediate portion are respectively connected to the first connecting portion and the second connecting portion, and in the thickness direction of the current collecting plate, the first connecting portion, the intermediate portion and the second connecting portion are stacked.

[0019] In some embodiments, the first connecting portion further includes an identification area, and the identification area is disposed near a connection between the middle portion and the first connecting portion.

[0020] In some embodiments, in the first direction, the line connecting the opposite side walls of the middle portion and the connection point of the first connecting portion is the first line, and the minimum distance between the identification area and the first line ranges from -2 mm to +2 mm; and / or, in the first direction, the maximum width of the identification area is D3, and the minimum width of the middle portion is D4, wherein 0.2<D3 / D4<1.

[0021] In some embodiments, the marking area is a through hole passing through the first connecting portion or a groove provided in the first connecting portion.

[0022] In some embodiments, the current collecting disk includes a disk body, a portion of which protrudes toward the pole core to form a first connecting portion protruding toward the pole core and a second connecting portion protruding toward the cover plate on the disk body.

[0023] In some embodiments, the thickness of the second connecting portion is greater than the thickness of the first connecting portion.

[0024] In some embodiments, the thickness of the first connecting portion is L1, and the thickness of the disk excluding the first connecting portion is L2, wherein 0 mm < L2 - L1 ≤ 0.5 mm.

[0025] According to an embodiment of the present application, a cover plate assembly for a battery cell includes: a cover plate, the cover plate includes an electrical lead-out terminal; a current collecting plate, the current collecting plate is the aforementioned current collecting plate, and the current collecting plate is electrically connected to the cover plate.

[0026] According to the cover plate assembly of the embodiment of the present application, by adopting the aforementioned current collecting plate, the connection area between the cover plate and the pole core can be increased, the connection strength can be improved, and the connection impedance can be reduced, which is beneficial to improving the working performance of the battery cell.

[0027] In some embodiments, the cover plate is provided with a liquid injection hole, and the first connecting portion further includes a avoidance opening for avoiding the liquid injection hole.

[0028] In some embodiments, the minimum distance between the avoidance port and the liquid injection hole ranges from 0 mm to 10 mm.

[0029] According to the battery cell of the embodiment of the present application, it includes: a shell, a accommodating cavity with an opening is formed in the shell; a pole core, the pole core is provided with a pole ear, and the pole core is arranged in the accommodating cavity; the cover plate assembly, the cover plate assembly is the aforementioned cover plate assembly, the cover plate is arranged at the opening, the current collecting plate is arranged between the pole ear and the cover plate, and the current collecting plate is electrically connected to the pole ear and the cover plate respectively.

[0030] According to the battery cell of the embodiment of the present application, the aforementioned cover plate assembly is adopted to realize the electrical connection between the cover plate and the pole core using the aforementioned collecting plate, thereby increasing the connection area between the cover plate and the pole core, thereby improving the connection strength between the cover plate and the pole core, and at the same time reducing the connection impedance, thereby improving the working performance of the battery cell.

[0031] In some embodiments, the connection area is welded to the tab, and a weld mark is provided at the connection area.

[0032] In some embodiments, multiple rows of weld lines are provided in the connection area in the width direction of the connection area, each row of weld lines includes multiple weld points, and the weld points in adjacent rows are staggered.

[0033] In some embodiments, the number of weld marks near the edge of the current collecting plate is greater than the number of weld marks near the geometric center of the current collecting plate.

[0034] In some embodiments, the battery cells are cylindrical batteries.

[0035] The battery assembly according to the embodiment of the present application includes a plurality of the aforementioned battery cells.

[0036] According to the battery assembly of the embodiment of the present application, the operating performance of the battery assembly is improved by adopting the aforementioned battery cells.

[0037] An electrical device according to an embodiment of the present application includes the aforementioned battery assembly.

[0038] According to the electric device of the embodiment of the present application, the operating performance of the electric device is improved by adopting the aforementioned battery assembly.

[0039] Additional aspects and advantages of the present application will become apparent from the following description or may be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0041] FIG1 is a schematic diagram of a current collecting plate before folding in some embodiments of the first aspect of the present application.

[0042] FIG2 is a schematic diagram of a current collecting plate according to some embodiments of the second aspect of the present application.

[0043] FIG3 is a schematic diagram of a cover plate assembly according to some embodiments of the first aspect of the present application, wherein the collecting plate is in an unfolded state.

[0044] FIG4 is a schematic diagram of a cover plate assembly according to some embodiments of the third aspect of the present application, wherein the collecting plate is in an unfolded state.

[0045] FIG5 is a schematic diagram of the cover plate assembly of some embodiments of the first aspect of the present application from another angle, wherein the collecting plate is in a folded state.

[0046] FIG6 is a schematic diagram of the cover plate assembly of some embodiments of the first aspect of the present application from another angle, wherein the collecting plate is in a folded state.

[0047] FIG. 7 is a front view of a battery cell according to some embodiments of the present application.

[0048] FIG8 is a schematic diagram of a battery cell according to some embodiments of the present application.

[0049] FIG9 is an exploded view of a battery cell according to some embodiments of the present application.

[0050] FIG10 is a schematic diagram of a battery assembly according to some embodiments of the present application.

[0051] FIG11 is a schematic diagram of an electrical device according to some embodiments of the present application.

[0052] Figure numerals: 1. electrical device; 10. battery assembly; 1000. battery cell; 100. current collecting plate; 110. second connecting portion; 120. first connecting portion; 121. connection area; 1211. opposite side walls; 1212. weld line; 1213. welding point; 122. identification area; 123. avoidance port; 130. middle portion; 140. disk body; 200. cover plate assembly; 210. cover plate; 211. liquid filling hole; 220. sealing pin; 230. sealing cover; 240. boss; 250. pole; 300. shell; 310. accommodating cavity; 311. opening; 320. pole core; 321. pole ear. Specific embodiments

[0053] The following describes in detail embodiments of the present application. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application and are not to be construed as limiting the present application.

[0054] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0055] The current collecting tray 100 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0056] As shown in FIG. 1 and FIG. 2 , a current collecting plate 100 according to an embodiment of the present application includes a first connecting portion 120 .

[0057] As shown in FIG1 and FIG2 , the first connecting portion 120 includes a connecting area 121 adapted to be electrically connected to the pole core 320 . In a direction away from the geometric center of the current collecting disk 100 , the width of the connecting area 121 increases from the inside to the outside.

[0058] By providing a connection area 121 electrically connected to the pole core 320 on the first connection portion 120, the electrical connection between the first connection portion 120 and the pole core 320 can be achieved, that is, the electrical connection between the collecting plate 100 and the pole core 320 can be achieved. The specific structure of the pole core 320 can be seen in Figure 9.

[0059] It should be noted that the geometric center of the collecting disc 100 mentioned above can be understood as a position close to the radial middle of the collecting disc 100, and the width of the connecting area 121 can be understood as the distance between the two opposite side walls of the connecting area 121 in the circumferential direction of the collecting disc 100. The width of the connecting area 121 increases from the inside to the outside, which means that the width of the portion of the connecting area 121 close to the edge of the collecting disc 100 is greater than the width of the portion of the connecting area 121 close to the geometric center of the collecting disc 100. In the prior art, especially For a cylindrical pole core, as the diameter of the pole core 320 increases, the circumference of the outer pole piece of the pole core 320 close to the edge of the collecting disk 100 will also increase accordingly. When the width of the portion of the connection area 121 close to the edge of the collecting disk 100 is set to be consistent with the width of the portion of the connection area 121 close to the geometric center of the collecting disk 100, the connection area between the outer pole piece of the pole core 320 and the collecting disk 100 will be smaller, resulting in low connection strength between the outer pole piece of the pole core 320 and the collecting disk 100 and increased impedance.

[0060] In order to solve the above problems, the present application sets the width of the connection area 121 to increase from the inside to the outside in the direction away from the geometric center of the current collecting disk 100, so as to set the width of the part of the connection area 121 close to the edge of the current collecting disk 100 to be larger than the width of the part of the connection area 121 close to the geometric center of the current collecting disk 100. This can solve the technical problem of the small connection area between the outer pole piece and the current collecting disk 100 to a certain extent, thereby improving the connection strength between the current collecting disk 100 and the pole core 320, and reducing the connection impedance.

[0061] That is to say, the present application adaptively adjusts the width of the connection area 121 according to the position of the connection area 121 on the current collecting disk 100, so that the connection area 121 has a small width near the geometric center of the current collecting disk 100 and a large width near the edge of the current collecting disk 100, so as to effectively solve the technical problem of the small connection area between the current collecting disk 100 and the outer pole piece of the pole core 320 in the prior art.

[0062] It can be seen from the above structure that the current collecting disk 100 in the embodiment of the present application, by setting the width of the connection area 121 to increase from the inside to the outside in the direction away from the geometric center of the current collecting disk 100, can make the width of the portion of the connection area 121 close to the edge of the current collecting disk 100 greater than the width of the portion of the connection area 121 close to the geometric center of the current collecting disk 100, thereby making the width of the portion of the connection area 121 close to the edge of the current collecting disk 100 larger. In this way, while ensuring the connection area between the connection area 121 and the inner pole piece of the pole core 320, the connection area between the connection area 121 and the outer pole piece of the pole core 320 can also be increased, thereby ensuring the connection area between the current collecting disk 100 and the outer pole piece of the pole core 320, improving the connection strength between the current collecting disk 100 and the pole core 320, and reducing the connection impedance, which is beneficial to improving the working performance of the battery cell 1000.

[0063] It can be understood that, compared with the prior art, the present application sets the width of the portion of the connection area 121 close to the edge of the current collecting disk 100 to be larger than the width of the portion of the connection area 121 close to the geometric center of the current collecting disk 100, so as to increase the connection area between the connection area 121 and the outer pole piece of the pole core 320, thereby ensuring the connection area between the current collecting disk 100 and the outer pole piece of the pole core 320, improving the connection strength between the current collecting disk 100 and the pole core 320, and reducing the connection impedance.

[0064] In the description of this application, features defined as "first" or "second" may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0065] In some embodiments, as shown in Figures 1 and 2, the width of the connection area 121 gradually increases from the inside to the outside in the direction away from the geometric center of the current collecting disk 100, so that the connection area 121 is formed into a "funnel" shape, so that the width of the portion of the connection area 121 close to the edge of the current collecting disk 100 is greater than the width of the portion of the connection area 121 close to the geometric center of the current collecting disk 100, thereby increasing the connection area between the connection area 121 and the outer pole piece of the pole core 320.

[0066] In some embodiments, a recess may be punched out on the first connecting portion 120 to form a connecting area 121 on the first connecting portion 120 , and the connecting area 121 may be stamped to reduce the difficulty of forming the connecting area 121 and ensure the structural strength of the connecting area 121 , while also facilitating the electrical connection between the first connecting portion 120 and the pole core 320 .

[0067] In some embodiments, the pit protrudes toward the pole core 320 so that the connection area 121 protrudes toward the pole core 320, which facilitates the electrical connection between the connection area 121 and the pole core 320 and ensures the connection yield between the connection area 121 and the pole core 320.

[0068] In some embodiments, the connection area 121 is welded to the pole core 320. This allows the connection area 121 and the pole core 320 to form an electrical connection while ensuring the connection strength between the connection area 121 and the pole core 320, and reduces the difficulty of connecting the connection area 121 and the pole core 320, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0069] In some embodiments, the current collecting disk 100 includes a positive current collecting disk and a negative current collecting disk. The positive current collecting disk is electrically connected to the positive electrode tab 321 of the pole core 320 , and the negative current collecting disk is electrically connected to the negative electrode tab 321 of the pole core 320 to ensure the working performance of the pole core 320 .

[0070] The positive electrode current collecting disc is made of aluminum, and the negative electrode current collecting disc is made of copper.

[0071] Of course, in some other embodiments, the material of the negative electrode current collecting plate is not limited to copper, but may also be steel. When the battery cell 1000 is a sodium battery, the material of the negative electrode current collecting plate may also be aluminum. No specific limitation is made here.

[0072] In some embodiments, as shown in Figures 1 and 2, the connection area 121 includes two spaced-apart opposite side walls 1211, and the distance between the two opposite side walls 1211 is the width of the connection area 121. The width of the portion of the connection area 121 close to the edge of the current collecting disk 100 is greater than the width of the portion of the connection area 121 close to the geometric center of the current collecting disk 100, so that in the direction away from the geometric center of the current collecting disk 100, the width of the connection area 121 increases from the inside to the outside, so as to increase the connection area between the connection area 121 and the outer pole piece of the pole core 320, thereby ensuring the connection area between the current collecting disk 100 and the outer pole piece of the pole core 320, improving the connection strength between the current collecting disk 100 and the pole core 320, and reducing the connection impedance, which is beneficial to improving the working performance of the battery cell 1000.

[0073] In some embodiments, the connection area 121 has a maximum width near the edge of the current collecting disk 100 and a minimum width near the geometric center of the current collecting disk 100, and the difference between the minimum width and the maximum width ranges from 2mm to 6mm. That is, the connection area 121 has a maximum width near the edge of the current collecting disk 100, and the connection area 121 has a minimum width near the geometric center of the current collecting disk 100, wherein the minimum width of the connection area 121 mentioned here can be understood as D1 shown in Figure 1, and the maximum width of the connection area 121 can be understood as D2 shown in Figure 1. When the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 is less than 2mm, under the premise that the minimum width of the connection area 121 is certain, the connection area between the connection area 121 and the outer pole piece of the pole core 320 cannot be effectively increased; when the minimum width of the connection area 121 and the maximum width of the connection area 121 are greater than 2mm .... 21 is greater than 6 mm, under the premise that the minimum width of the connection area 121 is certain, the maximum width of the connection area 121 will be wider. When the collecting disc 100 is formed as the collecting disc 100 in Figure 1, the connection area between the second connection part 110 and the first connection part 120 will be reduced. When the collecting disc 100 is formed as the collecting disc 100 in Figure 2, the area of ​​the second connection part 110 will be reduced, thereby reducing the connection strength between the collecting disc 100 and the cover plate 210. Under the premise that the maximum width of the connection area 121 is certain, the minimum width of the connection area 121 will be narrower, affecting the connection area between the connection area 121 and the inner pole piece of the pole core 320.

[0074] Therefore, the present application sets the value range of the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 to 2mm~6mm. In this way, while ensuring the connection area between the connection area 121 and the outer pole piece of the pole core 320, the connection area between the connection area 121 and the inner pole piece of the pole core 320 can also be ensured, thereby ensuring the connection area between the collecting disk 100 and the pole core 320, improving the connection strength between the collecting disk 100 and the pole core 320, and reducing the connection impedance.

[0075] In a specific example, the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 is 2 mm, 3 mm, 4 mm, 5 mm, or 6 mm, etc.

[0076] In some embodiments, the minimum width ranges from 1 mm to 10 mm. That is, the value range of D1 is 1 mm to 10 mm. When D1 is less than 1 mm, on the one hand, the difficulty of forming the connection area 121 increases, and on the other hand, the connection area between the connection area 121 and the inner pole piece of the pole core 320 is reduced. When D1 is greater than 10 mm, because the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 ranges from 2 mm to 6 mm, the maximum width D2 of the connection area 121 is wider. In this way, when the collecting disc 100 is formed as the collecting disc 100 in FIG. 1 , the connection area between the second connecting portion 110 and the first connecting portion 120 is reduced. When the collecting disc 100 is formed as the collecting disc 100 in FIG. 2 , the area of ​​the second connecting portion 110 is reduced, thereby reducing the connection strength between the collecting disc 100 and the cover plate 210.

[0077] Therefore, the present application sets the minimum width of the connection area 121 to a value range of 1mm to 10mm. While reducing the difficulty of forming the connection area 121 and increasing the connection area between the connection area 121 and the inner pole piece of the pole core 320, it can also ensure the connection area between the second connection part 110 and the first connection part 120 and improve the connection strength between the collecting plate 100 and the cover plate 210, thereby ensuring the working performance of the battery cell 1000.

[0078] In specific examples, the minimum width of the connection region 121 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0079] In some embodiments, as shown in Figures 1 and 2, the first connection portion 120 includes a plurality of connection areas 121, which are spaced apart along the circumference of the current collecting disk 100. This increases the connection area between the first connection portion 120 and the pole core 320, thereby improving the connection strength between the first connection portion 120 and the pole core 320, ensuring the current flow capacity of the current collecting disk 100, and reducing impedance.

[0080] In the description of the present application, unless otherwise specified, “plurality” means two or more.

[0081] In some embodiments, as shown in Figures 1 and 2 , there are two connection areas 121 symmetrically arranged relative to the geometric center of the current collecting plate 100. This ensures that the connection area between the first connection portion 120 and the pole core 320 is sufficient, simplifies the structure of the current collecting plate 100, reduces the manufacturing difficulty of the current collecting plate 100, and ensures that the connection points between the current collecting plate 100 and the pole core 320 are evenly distributed on the pole core 320.

[0082] In some embodiments, a portion of the current collecting plate 100 is bent to define the connection region 121. This reduces the difficulty of forming the connection region 121 while ensuring the connection strength between the connection region 121 and the current collecting plate 100, stabilizes the position of the connection region 121, and thus ensures the working performance of the connection region 121, ensuring that the connection region 121 can effectively achieve electrical connection between the first connecting portion 120 and the pole core 320.

[0083] In a specific example, a portion of the current collecting plate 100 may be stamped to define the connection area 121 , so that the connection area 121 is stamped and formed, thereby reducing the difficulty of forming the connection area 121 .

[0084] In some embodiments, as shown in conjunction with FIG1 and FIG5 , the current collecting tray 100 further includes a second connecting portion 110 and an intermediate portion 130. The intermediate portion 130 is connected at both ends to the first connecting portion 120 and the second connecting portion 110, respectively. The first connecting portion 120, the intermediate portion 130, and the second connecting portion 110 are stacked in the thickness direction of the current collecting tray 100. The thickness direction referred to herein can also be understood as the vertical direction shown in FIG1 . By stacking the first connecting portion 120, the intermediate portion 130, and the second connecting portion 110 in the thickness direction of the current collecting tray 100, it is possible to facilitate the use of the current collecting tray 100 to connect two structural members (such as the cover plate 210 and the pole core 320) disposed in the vertical direction, thereby reducing the difficulty of connecting the cover plate 210 and the pole core 320 that are spaced apart in the vertical direction.

[0085] At the same time, by arranging the first connecting part 120, the middle part 130 and the second connecting part 110 to be stacked in the thickness direction of the collecting plate 100, the size of the collecting plate 100 in the thickness direction can also be reduced, thereby reducing the axial size of the battery cell 1000 and reducing the difficulty of assembling the battery cell 1000.

[0086] In some embodiments, the second connection portion 110 is adapted to be electrically connected to the cover plate 210. This allows for electrical connection between the current collecting plate 100 and the cover plate 210, and thus between the pole core 320 and the cover plate 210. This facilitates current extraction from the pole core 320 using the cover plate 210, thereby ensuring the operating performance of the pole core 320, and thus ensuring the operating performance of the battery cell 1000.

[0087] It should be noted that the cover plate 210 mentioned above can be understood as the cover plate 210 located on the cover plate assembly 200 in the battery cell 1000. The specific structure of the cover plate 210 can be seen in Figures 3, 4, 5 or 6, thereby realizing the electrical connection between the collecting plate 100 and the cover plate assembly 200.

[0088] In some embodiments, the second connection portion 110 is welded to the cover plate 210. This allows the second connection portion 110 and the cover plate 210 to form an electrical connection while ensuring the connection strength between the second connection portion 110 and the cover plate 210, and reduces the difficulty of connecting the second connection portion 110 and the cover plate 210, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0089] In some embodiments, as shown in FIG. 3 , FIG. 4 and FIG. 5 , a pole 250 is provided on the cover plate 210 , and the pole 250 passes through the cover plate 210 . The second connecting portion 110 is adapted to be electrically connected to the pole 250 .

[0090] In some embodiments, during the processing of the collecting plate 100, the collecting plate 100 is first formed into the shape of Figure 1. After the processing of the collecting plate 100 is completed, the collecting plate 100 is folded (as shown in Figure 5) so that the collecting plate 100 is formed into the shape shown in Figure 6, so that the first connecting portion 120, the middle portion 130 and the second connecting portion 110 of the collecting plate 100 are stacked in the thickness direction of the collecting plate 100, which facilitates the use of the collecting plate 100 to realize the electrical connection between the cover plate 210 and the pole core 320, reduces the difficulty of connecting the cover plate 210 and the pole core 320, reduces the occupied space of the collecting plate 100, and reduces the molding difficulty of the collecting plate 100.

[0091] In some embodiments, as shown in Figures 1 and 5, the first connecting portion 120 further includes an identification area 122, which is provided near the connection between the middle portion 130 and the first connecting portion 120. In other words, the identification area 122 is provided near the connection between the middle portion 130 and the first connecting portion 120. The identification area 122 helps workers quickly determine the position of the connection between the middle portion 130 and the first connecting portion 120, thereby facilitating folding the current collecting tray 100 from the shape of Figure 1 to the shape shown in Figure 5, reducing the molding difficulty of the current collecting tray 100, and ensuring the structural accuracy of the current collecting tray 100 after molding, thereby avoiding the connection between the middle portion 130 and the first connecting portion 120 being formed on the connection area 121. This can also ensure the area of ​​the connection area 121, thereby ensuring the connection area between the current collecting tray 100 and the pole core 320, and improving the operating performance of the battery cell 1000.

[0092] That is to say, by setting the identification area 122, the present application can reduce the difficulty of molding the collecting plate 100 while limiting the folding position of the collecting plate 100, thereby avoiding the connection between the middle part 130 and the first connecting part 120 from being formed on the connecting area 121, so as to ensure the connection area between the connecting area 121 and the pole core 320.

[0093] In some embodiments, as shown in Figures 1 and 5, the identification area 122 is located between two adjacent connection areas 121 to achieve rational utilization of the space on the collecting plate 100 and ensure that the identification area 122 can be set close to the connection between the middle part 130 and the first connection part 120.

[0094] In some embodiments, as shown in FIG5 , in the first direction, the line connecting the opposite sidewalls of the middle portion 130 and the connection point of the first connecting portion 120 is the first connecting line T1, and the minimum distance between the marking area 122 and the first connecting line T1 ranges from -2 mm to +2 mm. It can also be understood that the line connecting the middle portion 130 and the first connecting portion 120 is the first connecting line T1, and there are multiple distances between the marking area 122 and the first connecting line T1, the minimum distance of which ranges from -2 mm to +2 mm. The minimum distance between the marking area 122 and the first connecting line T1 can also be understood as T2 shown in FIG5 .

[0095] It should be noted that, since the identification area 122 is arranged between two adjacent connection areas 121, when the minimum distance between the identification area 122 and the first connection line T1 is less than -2 mm, the first connection line T1 will be formed on the connection area 121, reducing the connection area between the connection area 121 and the pole core 320; when the minimum distance between the identification area 122 and the first connection line T1 is greater than 2 mm, the area of ​​the middle part 130 will be reduced, reducing the structural strength of the middle part 130, and will also cause the second connection part 110, the middle part 130 and the first connection part 120 to be unable to be stacked in the thickness direction of the collecting plate 100, affecting the performance of the collecting plate 100.

[0096] Therefore, the present application sets the value range of the minimum distance between the identification area 122 and the first connecting line T1 to -2mm to +2mm, while ensuring the connection area between the connection area 121 and the pole core 320, and at the same time ensuring the area of ​​the middle part 130, so that the second connection part 110, the middle part 130 and the first connection part 120 can be effectively stacked in the thickness direction of the collecting plate 100, thereby ensuring the performance of the collecting plate 100.

[0097] In a specific example, the minimum distance between the marking area 122 and the first connecting line T1 is -2 mm, -1 mm, 0 mm, 1 mm, or 2 mm.

[0098] Optionally, as shown in FIG1 , in the first direction, the maximum width of the identification area 122 is D3, and the minimum width of the middle portion 130 is D4, where 0.2<D3 / D4<1. In other words, the maximum width of the identification area 122 is less than the minimum width of the middle portion 130, and the ratio of the maximum width of the identification area 122 to the minimum width of the middle portion 130 is greater than 0.2. This prevents the structural strength of the collector tray 100 from being reduced by the provision of the identification area 122 while ensuring that the identification area 122 has a certain width, thereby facilitating the use of limiting the folding position of the collector tray 100 and reducing the difficulty of molding the collector tray 100.

[0099] In some embodiments, the ratio of the maximum width of the logo area 122 to the minimum width of the middle portion 130 is 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, or 0.9, etc.

[0100] In some embodiments, as shown in conjunction with Figures 1 and 5 , the identification area 122 is a through hole extending through the first connecting portion 120 or a groove provided in the first connecting portion 120. In other words, the identification area 122 can be formed as a through hole extending through the first connecting portion 120 or as a groove provided in the first connecting portion 120. There is no specific limitation here, as long as the position of the identification area 122 can be visually observed by the operator so that the identification area 122 can be used to determine the folding position of the collecting tray 100.

[0101] The figure shows that the shape of the identification area 122 is a triangle, but in some other embodiments, the shape of the identification area 122 may also be a rectangle, a circle, an ellipse or an irregular shape.

[0102] In some embodiments, as shown in FIG. 2 , the current collecting plate 100 includes a plate body 140 , a portion of which protrudes toward the pole core 320 to form a first connecting portion 120 protruding toward the pole core 320 and a second connecting portion 110 protruding toward the cover plate 210 . That is to say, it is not limited to setting the collecting plate 100 to include a first connecting portion 120, an intermediate portion 130 and a second connecting portion 110, and setting the first connecting portion 120, the intermediate portion 130 and the second connecting portion 110 to be stacked in the thickness direction of the collecting plate 100. The collecting plate 100 can also be set as a plate body 140, and a part of the plate body 140 protrudes toward the pole core 320 to realize the formation of a first connecting portion 120 protruding toward the pole core 320 and a second connecting portion 110 protruding toward the cover plate 210 on the plate body 140. Here, the collecting plate 100 can also be used to realize the electrical connection between the cover plate 210 and the pole core 320, thereby reducing the difficulty of connecting the cover plate 210 and the pole core 320 and ensuring the connection quality of the cover plate 210 and the pole core 320.

[0103] In some embodiments, the thickness of the second connection portion 110 is greater than the thickness of the first connection portion 120. This means that when both the second connection portion 110 and the first connection portion 120 are formed on the disk body 140, the thickness of the second connection portion 110 is greater than the thickness of the first connection portion 120, so that the second connection portion 110 is thicker, and thus the main body of the current collecting disk 100 is thicker. This facilitates directly forming the second connection portion 110 and the first connection portion 120 on the current collecting disk 100, preventing the current collecting disk 100 from breaking during the molding process. It also prevents the second connection portion 110 from affecting the pole core 320 when welding to the cover plate 210, thereby extending the service life of the pole core 320.

[0104] At the same time, by setting the thickness of the second connection part 110 to be greater than the thickness of the first connection part 120, it is also beneficial to set the thickness of the first connection part 120 to be thinner, which facilitates the welding of the first connection part 120 and the pole core 320 and increases the welding yield.

[0105] In some embodiments, as shown in FIG2 , the thickness L1 of the first connection portion 120 is 0.1 mm to 0.8 mm. When the thickness of the first connection portion 120 is less than 0.1 mm, the structural strength of the first connection portion 120 is reduced, making the current collecting plate 100 more susceptible to breakage and shortening the service life of the current collecting plate 100. When the thickness of the first connection portion 120 is greater than 0.8 mm, welding the first connection portion 120 to the pole core 320 becomes more difficult.

[0106] Therefore, the present application sets the thickness L1 of the first connection portion 120 to 0.1 mm to 0.8 mm, which can prevent the current collecting plate 100 from breaking while facilitating welding of the first connection portion 120 and the pole core 320 and increasing welding yield.

[0107] In a specific example, the thickness of the first connection portion 120 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, or 0.8 mm.

[0108] Optionally, as shown in FIG2 , the thickness of the disc body 140 excluding the first connecting portion 120 is L2, where 0 mm < L2 - L1 ≤ 0.5 mm. In other words, the thickness of the second connecting portion 110 is greater than the thickness of the first connecting portion 120, and the difference in thickness between the second connecting portion 110 and the first connecting portion 120 is less than 0.5 mm. This prevents the first connecting portion 120 from being too thick, thereby preventing portions of the disc body 140 from effectively protruding toward the pole core 320 to form the first connecting portion 120. This reduces the molding difficulty, weight, and production cost of the current collecting disc 100.

[0109] In a specific example, the thickness of the disk body 140 excluding the first connection portion 120 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0110] The cap plate assembly 200 for the battery cell 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0111] 3 to 6 , a cover plate assembly 200 for a battery cell 1000 according to an embodiment of the present application includes a cover plate 210 and a current collecting plate 100 .

[0112] The cover plate 210 includes an electrical lead-out terminal, which may be a pole 250 or the cover plate 210 itself.

[0113] As shown in Figures 3-6 , the current collecting tray 100 is the aforementioned current collecting tray 100 . The specific structure of the current collecting tray 100 is not described here. The current collecting tray 100 is connected to the electrical lead-out terminal, thereby achieving electrical connection between the current collecting tray 100 and the cover plate 210 , thereby facilitating the extraction of current from the pole core 320 .

[0114] In some embodiments, the second connection portion 110 of the current collecting tray 100 is connected to the electrical lead-out terminal, which not only realizes the electrical connection between the current collecting tray 100 and the cover plate 210 , but also reduces the difficulty of the electrical connection between the current collecting tray 100 and the cover plate 210 .

[0115] As can be seen from the above structure, the cover plate assembly 200 of the embodiment of the present application, by adopting the aforementioned collecting plate 100, can increase the connection area between the cover plate 210 and the pole core 320, improve the connection strength, and at the same time reduce the connection impedance, which is beneficial to improving the working performance of the battery cell 1000.

[0116] In some embodiments, as shown in Figures 3, 5, and 6, the cover plate 210 is provided with a liquid injection hole 211, and the first connecting portion 120 further includes a bypass opening 123 for avoiding the liquid injection hole 211. Specifically, by providing the liquid injection hole 211 on the cover plate 210, liquid injection toward the pole core 320 through the liquid injection hole 211 can be facilitated, thereby ensuring the working performance of the pole core 320; by providing the bypass opening 123 for avoiding the liquid injection hole 211 on the first connecting portion 120, the first connecting portion 120 can be prevented from obstructing the liquid injection from the liquid injection hole 211, thereby ensuring that the electrolyte flowing through the liquid injection hole 211 can effectively flow to the pole core 320, thereby ensuring the liquid injection effect.

[0117] Therefore, the above can also be understood as that by providing the avoidance opening 123 for avoiding the injection hole 211 on the first connecting portion 120, the injection space can be increased, the electrolyte can be prevented from rebounding and overflowing during injection, and the injection efficiency can be improved.

[0118] It is worth noting that based on the structural form of the collecting plate 100 of the present application and to avoid opening a hole on the pole 250, the present application has an offset design for the injection hole 211. However, after the offset design, there will still be a phenomenon that the collecting plate 100 hinders the injection of liquid through the injection hole 211. Therefore, the present application provides an avoidance port 123 on the first connecting part 120 for avoiding the injection hole 211 to ensure the injection effect, thereby improving the injection efficiency.

[0119] In some embodiments, as shown in Figures 5 and 6, a boss 240 is provided on one side of the cover plate 210 and is arranged around the periphery of the injection hole 211. The boss 240 can guide the electrolyte flowing out of the injection hole 211 to flow toward the pole core 320 to further improve the injection effect.

[0120] In some embodiments, the minimum spacing between the avoidance opening 123 and the injection hole 211 ranges from 0 mm to 10 mm. This prevents interference between the collecting plate 100 and the injection hole 211 while ensuring the area of ​​the collecting plate 100, thereby ensuring the welding area between the collecting plate 100 and the pole core 320 and improving the welding effect.

[0121] It should be noted that, as shown in Figures 5 and 6, when a boss 240 is provided on the outer periphery of the liquid injection hole 211, the above-mentioned minimum distance between the avoidance port 123 and the liquid injection hole 211 can be understood as the minimum distance between the avoidance port 123 and the boss 240, that is, T3 shown in Figure 6. In this way, while avoiding the collecting plate 100 from blocking the liquid injection hole 211, it can also prevent the collecting plate 100 from interfering with the boss 240, thereby reducing the welding thermal deformation of the connection area 121.

[0122] In a specific example, the minimum distance between the avoidance opening 123 and the liquid injection hole 211 is 1 mm, 3 mm, 5 mm, or 10 mm.

[0123] In some embodiments, in combination with Figures 3, 8 and 9, the injection hole 211 is formed as an injection channel, and the injection channel has an inlet and an outlet. The cover assembly 200 also includes a sealing pin 220 and a sealing cover 230. The sealing pin 220 is formed by injection molding, and the sealing cover 230 is formed by stamping. After the injection of the injection hole 211 is completed, the sealing pin 220 is first used to seal the outlet of the injection hole 211, and then the sealing cover 230 is laser welded to the inlet of the injection hole 211 to achieve sealing of the injection hole 211.

[0124] At the same time, by using the sealing nail 220 to block the outlet of the liquid injection hole 211, it is also possible to prevent welding slag from falling into the pole core 320 during the welding process of the sealing cover 230, thereby avoiding the risk of short circuit of the pole core 320.

[0125] In some embodiments, the cover plate assembly 200 includes a positive cover plate assembly and a negative cover plate assembly, the positive cover plate assembly includes a positive current collecting plate, the negative cover plate assembly includes a negative current collecting plate, and both the positive current collecting plate and the negative current collecting plate are provided with a avoidance port 123, and both the positive cover plate assembly and the negative cover plate assembly are provided with a liquid injection hole 211 and a boss 240. This allows the structures of the positive cover plate assembly and the negative cover plate assembly to be consistent, thereby facilitating processing using a unified mold and reducing the difficulty of forming the cover plate assembly 200.

[0126] The battery cell 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0127] 7 , 8 and 9 , a battery cell 1000 according to an embodiment of the present application includes: a housing 300 , a pole core 320 and a cover plate assembly 200 .

[0128] As shown in FIG. 9 , a receiving cavity 310 having an opening 311 is formed in the housing 300 .

[0129] As shown in FIG9 , the pole core 320 is provided with a pole ear 321 and is disposed in the accommodating cavity 310 . Thus, the pole core 320 is disposed in the housing 300 , which facilitates the use of the housing 300 to protect the pole core 320 , prolong the service life of the pole core 320 , and improve the safety of the pole core 320 .

[0130] As shown in FIG9 , the cover plate assembly 200 is the aforementioned cover plate assembly 200 . The specific structure of the cover plate assembly 200 is not described in detail here. The cover plate 210 is disposed at the opening 311 , and the current collecting plate 100 is disposed between the tab 321 and the cover plate 210 . The current collecting plate 100 is electrically connected to the tab 321 and the cover plate 210 , respectively. This achieves electrical connection between the tab 321 and the cover plate 210 , that is, between the electrode core 320 and the cover plate 210 , thereby ensuring the operating performance of the battery cell 1000 .

[0131] In some embodiments, the second connection portion 110 of the collecting plate 100 is connected to the cover plate 210, and the first connection portion 120 of the collecting plate 100 is electrically connected to the pole lug 321. In this way, while achieving electrical connection between the collecting plate 100, the pole lug 321 and the cover plate 210, the difficulty of electrical connection between the collecting plate 100, the pole lug 321 and the cover plate 210 can be reduced, and the quality of electrical connection between the collecting plate 100, the pole lug 321 and the cover plate 210 can be ensured.

[0132] The electrical connection between the current collecting plate 100 and the cover plate 210 mentioned here can be understood as the electrical connection between the current collecting plate 100 and the electrical lead-out terminal.

[0133] As can be seen from the above structure, the battery cell 1000 of the embodiment of the present application adopts the aforementioned cover plate assembly 200 to realize the electrical connection between the cover plate 210 and the pole core 320 using the aforementioned collecting plate 100, thereby increasing the connection area between the cover plate 210 and the pole core 320, thereby improving the connection strength between the cover plate 210 and the pole core 320, and at the same time reducing the connection impedance, thereby improving the working performance of the battery cell 1000.

[0134] In some embodiments, the housing 300 is formed by stamping or welding, and the material of the housing 300 is aluminum or steel.

[0135] In some embodiments, the connection area 121 is welded to the tab 321, and a weld mark 1212 is provided at the connection area 121 (the specific structure of the weld mark 1212 can be seen in Figures 1 and 2). It can also be understood here that after the connection area 121 and the tab 321 are welded, a weld mark 1212 is formed at the connection area 121, wherein the weld connection not only achieves an electrical connection between the connection area 121 and the tab 321, but also ensures the connection strength between the connection area 121 and the tab 321, so that the relative position of the connection area 121 and the tab 321 is stable, thereby ensuring the operating performance of the battery cell 1000.

[0136] In some embodiments, the connection region 121 and the tab 321 are welded together by pulse spot welding.

[0137] When the connection area 121 and the tab 321 are welded together by pulse spot welding, as shown in FIG1 and FIG2 , the weld line 1212 includes a plurality of welding points 1213 , and the plurality of welding points 1213 cooperate to achieve a fixed connection between the connection area 121 and the tab 321 .

[0138] In some other embodiments, the connection area 121 and the tab 321 are welded by laser beam welding. When the connection area 121 and the tab 321 are welded by laser beam welding, the weld line 1212 is formed into a weld line (not shown in the figure).

[0139] In some embodiments, as shown in FIG. 1 and FIG. 2 , multiple rows of weld lines 1212 are provided in the connection area 121 in the width direction of the connection area 121 , each row of weld lines 1212 includes multiple weld points 1213 , and the weld points 1213 in adjacent rows are staggered. Among them, by arranging multiple rows of weld marks 1212 in the connection area 121, the connection area between the connection area 121 and the pole core 320 is increased, thereby improving the connection strength between the connection area 121 and the pole core 320 and ensuring the connection effect between the connection area 121 and the pole core 320; by staggering the weld points 1213 in adjacent rows, on the one hand, the weld points 1213 in adjacent rows can be avoided from interfering with each other, thereby reducing the thermal influence between the weld points 1213 and improving the welding yield, and can also make the distribution of multiple weld points 1213 more uniform and the impedance lower. On the other hand, it can also ensure that the cooperation of the multiple weld points 1213 in adjacent rows can enable each layer of the pole piece of the pole core 320 to be electrically connected to the collecting plate 100, thereby ensuring the connection quality between the pole core 320 and the collecting plate 100.

[0140] It should be noted that the staggered arrangement of the adjacent rows of welds 1213 mentioned above can also be understood as, in two adjacent rows of weld lines 1212, in the width direction of the connection area 121, the weld points 1213 of one row of weld lines 1212 are directly opposite to the position between the two weld points 1213 of the other row of weld lines 1212, thereby avoiding mutual interference between the weld points 1213 in the adjacent rows during the welding process, reducing the thermal impact between the weld points 1213, improving the welding yield, and at the same time ensuring that each layer of pole pieces in the radial direction of the pole core 320 can be electrically connected to the collecting plate 100.

[0141] Of course, in some other embodiments, under the premise that the width of the connection area 121 is large enough, the welding points 1213 in adjacent rows may also be arranged to face each other in the width direction of the connection area 121 .

[0142] It should be noted that when adjacent rows of welding points 1213 are arranged opposite each other, in the radial direction of the pole core 320, the welding points 1213 on at least one row of weld lines 1212 are consistent with the number of pole pieces of the pole core 320 and correspond one to one, thereby ensuring that each layer of pole pieces in the radial direction of the pole core 320 can be electrically connected to the collecting disk 100, ensuring the connection quality between the pole core 320 and the collecting disk 100, and helping to improve the working performance of the pole core 320.

[0143] In some embodiments, as shown in conjunction with FIG1 and FIG2 , the number of weld lines 1212 near the edge of the current collecting disk 100 is greater than the number of weld lines 1212 near the geometric center of the current collecting disk 100. In other words, the number of weld lines 1212 near the edge of the current collecting disk 100 is greater than the number of weld lines 1212 near the geometric center of the current collecting disk 100, thereby effectively ensuring that the connection area between the connection region 121 and the outer pole piece of the pole core 320 is increased, improving the connection strength between the current collecting disk 100 and the pole core 320, and reducing the connection impedance.

[0144] It should be noted that Figures 1 and 2 both show the example of the number of weld marks 1212 near the edge of the collecting plate 100 being three rows and the number of weld marks 1212 near the geometric center of the collecting plate 100 being two rows. However, in some other embodiments, the number of weld marks 1212 near the edge of the collecting plate 100 can be set to four rows and the number of weld marks 1212 near the geometric center of the collecting plate 100 can be set to three rows, or the number of weld marks 1212 near the edge of the collecting plate 100 can be set to four rows and the number of weld marks 1212 near the geometric center of the collecting plate 100 can be set to two rows. No specific restriction is made here, as long as the number of weld marks 1212 near the edge of the collecting plate 100 is greater than the number of weld marks 1212 near the geometric center of the collecting plate 100.

[0145] In some embodiments, as shown in FIG7 , FIG8 and FIG9 , the battery cell 1000 is a cylindrical battery, so that the battery cell 1000 has advantages such as high capacity, long cycle life, and wide operating temperature range, thereby ensuring the working performance of the battery cell 1000 .

[0146] The battery assembly 10 according to an embodiment of the present application is described below.

[0147] As shown in FIG. 10 , a battery assembly 10 according to an embodiment of the present application includes: a plurality of battery cells 1000 .

[0148] The battery cell 1000 is the aforementioned battery cell 1000 , and the specific structure of the battery cell 1000 is not described in detail here.

[0149] As can be seen from the above structure, the battery assembly 10 of the embodiment of the present application improves the working performance of the battery assembly 10 by adopting the aforementioned battery cell 1000 .

[0150] It should be noted that the battery assembly 10 mentioned here can be a battery pack or a battery module.

[0151] The following describes the electrical device 1 according to an embodiment of the present application.

[0152] As shown in FIG11 , an electrical device 1 according to an embodiment of the present application includes: a battery assembly 10 .

[0153] The battery assembly 10 is the aforementioned battery assembly 10 , and the specific structure of the battery assembly 10 is not described here in detail.

[0154] As can be seen from the above structure, the electrical device 1 of the embodiment of the present application improves the working performance of the electrical device 1 by adopting the aforementioned battery assembly 10 .

[0155] It should be noted that the electrical device 1 mentioned here can be but is not limited to a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc.

[0156] Among them, electric toys may include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys; spacecraft may include airplanes, rockets, space shuttles and spacecraft; power tools include metal cutting power tools, grinding power tools, assembly power tools and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0157] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0158] Figures 1 and 2 both show two connection areas 121 for illustrative purposes, but after reading the above technical solution, ordinary technicians can obviously understand that the solution can be applied to a technical solution with three or more connection areas 121, which also falls within the scope of protection of this application.

[0159] The specific structures of the collecting plate 100, the cover plate assembly 200, the battery cell 1000, the battery assembly 10 and other components of the electrical device 1, such as the pole core 320, according to the embodiment of the present application are well known to ordinary technicians in this field and will not be described in detail here.

[0160] Throughout this specification, references to terms such as "embodiment" and "example" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present application. In this specification, schematic representations 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 any one or more embodiments or examples.

[0161] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and intent of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A collecting plate (100), wherein: include: A first connecting portion (120) includes a connecting area (121) adapted for electrical connection to the pole core (320), wherein the width of the connecting area (121) increases from the inside to the outside in a direction away from the geometric center of the collecting disk (100).

2. The collecting tray (100) according to claim 1, wherein: The connection area (121) has a maximum width close to the edge of the collecting plate (100) and a minimum width close to the geometric center of the collecting plate (100), and the difference between the minimum width and the maximum width ranges from 2 mm to 6 mm.

3. The collecting tray (100) according to claim 2, wherein: The minimum width ranges from 1 mm to 10 mm.

4. The collecting tray (100) according to any one of claims 1 to 3, wherein: The first connection portion (120) includes a plurality of connection areas (121), and the plurality of connection areas (121) are arranged at intervals along the circumference of the current collecting plate (100).

5. The collecting tray (100) according to claim 4, wherein: There are two connection areas (121) and they are symmetrically arranged relative to the geometric center of the collecting plate (100).

6. The collecting tray (100) according to claim 4 or 5, wherein: A portion of the collecting plate (100) is bent to define the connecting area (121).

7. The collecting tray (100) according to any one of claims 1 to 6, wherein: The collecting plate (100) further comprises a second connecting portion (110) and an intermediate portion (130), wherein the second connecting portion (110) is suitable for being electrically connected to the cover plate (210), and the two ends of the intermediate portion (130) are respectively connected to the first connecting portion (120) and the second connecting portion (110), and in the thickness direction of the collecting plate (100), the first connecting portion (120), the intermediate portion (130) and the second connecting portion (110) are stacked.

8. The collecting tray (100) according to claim 7, wherein: The first connecting portion (120) further includes a marking area (122), and the marking area (122) is arranged near the connection between the middle portion (130) and the first connecting portion (120).

9. The collecting tray (100) according to claim 8, wherein: In the first direction, a line connecting the opposite side walls (1211) of the middle portion (130) and the connection point of the first connecting portion (120) is a first line, and a value range of a minimum distance between the marking area (122) and the first line is -2 mm to +2 mm; And / or, in the first direction, the maximum width of the identification area (122) is D3, and the minimum width of the middle portion (130) is D4, wherein 0.2<D3 / D4<1.

10. The collecting tray (100) according to claim 8 or 9, wherein: The identification area (122) is a through hole that passes through the first connecting portion (120) or a groove provided in the first connecting portion (120).

11. The collecting tray (100) according to any one of claims 1 to 10, wherein: The collecting disk (100) includes a disk body (140), a portion of which protrudes toward the pole core (320) to form a first connecting portion (120) protruding toward the pole core (320) and a second connecting portion (110) protruding toward the cover plate (210) on the disk body (140).

12. The collecting tray (100) according to claim 11, wherein: The thickness of the second connecting portion (110) is greater than the thickness of the first connecting portion (120).

13. The collecting tray (100) according to claim 11 or 12, wherein: The thickness of the first connecting portion (120) is L1, and the thickness of the disc body (140) excluding the first connecting portion (120) is L2, wherein 0mm<L2-L1≤0.5mm.

14. A cover plate assembly (200) for a battery cell (1000), wherein: include: A cover plate (210), the cover plate (210) comprising an electrical lead-out terminal; A current collecting disk (100), wherein the current collecting disk (100) is the current collecting disk (100) according to any one of claims 1 to 13, and the current collecting disk (100) is connected to the electrical lead-out terminal.

15. The cover plate assembly (200) according to claim 14, wherein: The cover plate (210) is provided with a liquid injection hole (211), and the first connecting portion (120) further comprises a relief opening (123) for avoiding the liquid injection hole (211).

16. The cover plate assembly (200) according to claim 15, wherein: The minimum distance between the avoidance opening (123) and the liquid injection hole (211) ranges from 0 mm to 10 mm.

17. A battery cell (1000), wherein: include: A housing (300), wherein a receiving cavity (310) having an opening (311) is formed in the housing (300); A pole core (320), the pole core (320) being provided with a pole ear (321), and the pole core (320) being arranged in the accommodating cavity (310); A cover plate assembly (200), wherein the cover plate assembly (200) is the cover plate assembly (200) according to any one of claims 14 to 16, wherein the cover plate (210) is arranged at the opening (311), the collecting plate (100) is arranged between the pole lug (321) and the cover plate (210), and the collecting plate (100) is electrically connected to the pole lug (321) and the cover plate (210), respectively.

18. The battery cell (1000) according to claim 17, wherein: The connection area (121) is welded to the tab (321), and a welding mark (1212) is provided at the connection area (121).

19. The battery cell (1000) according to claim 18, wherein: In the width direction of the connection area (121), a plurality of rows of welding lines (1212) are provided in the connection area (121), each row of welding lines (1212) includes a plurality of welding points (1213), and the welding points (1213) in adjacent rows are staggered.

20. The battery cell (1000) according to claim 19, wherein: The number of weld lines (1212) near the edge of the current collecting plate (100) is greater than the number of weld lines (1212) near the geometric center of the current collecting plate (100).

21. The battery cell (1000) according to any one of claims 17 to 20, wherein: The battery cell (1000) is a cylindrical battery.

22. A battery assembly (10), wherein: The invention comprises a plurality of battery cells (1000) according to any one of claims 17 to 21.

23. An electrical device (1), wherein: Comprising a battery assembly (10) according to claim 22.

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