Collecting plate, cover plate assembly, battery monomer, battery assembly and electric device

Abstract

The utility model discloses a collector plate, cover plate subassembly, battery monomer, battery pack and electric device, the collector plate includes first connecting portion, the first connecting portion includes connecting area suitable for being electrically connected with pole core, in the direction far away from the geometric center of collector plate, the width of connecting area increases from inside to outside. According to the current collecting plate disclosed by the embodiment of the utility model, the connecting area of the current collecting plate close to the edge and the pole core is relatively large, so that the connecting strength of the current collecting plate and the pole core is ensured, the connecting impedance can be reduced, and the working performance of a single battery is favorably improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a current collecting plate, a cover plate assembly, a battery cell, a battery assembly and an electrical device. Background Art

[0002] In the prior art, in order to achieve electrical connection between the cover plate and the pole core, a current collecting plate is usually arranged between the cover plate and the pole core.

[0003] However, when the existing current collector is connected to the pole core, the welding area between the current collector and the outer pole piece of the pole core is small, resulting in reduced connection strength between the current collector and the pole core and increased impedance, which affects the working performance of the battery cell. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of the utility model is to provide a current collector, which can ensure the connection area between the current collector and the outer pole piece of the pole core, improve the connection strength between the current collector and the pole core, and reduce the connection impedance, thereby solving the technical problems of the current collector and the pole core in the prior art, such as small connection area, low connection strength and high connection impedance.

[0005] The second objective of the present invention is to provide a cover plate assembly having the above-mentioned collecting plate.

[0006] The third objective of the present utility model is to provide a battery cell having the above-mentioned cover plate assembly.

[0007] A fourth objective of the present invention is to provide a battery assembly having the above-mentioned battery cell.

[0008] The fifth objective of the present utility model is to provide an electrical device having the above-mentioned battery assembly.

[0009] According to an embodiment of the present invention, the current collecting disk comprises: a first connecting portion, wherein the first connecting portion comprises a connecting area suitable for being electrically connected 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.

[0010] According to the current collecting disk of the embodiment of the utility model, a connection area is provided on the first connection part, 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, the working performance of the battery cell is ensured, and 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 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.

[0011] In some embodiments, the connection area has a maximum width close to the edge of the current collecting disk and a minimum width close to 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.

[0012] In some embodiments, the minimum width ranges from 1 mm to 10 mm.

[0013] In some embodiments, the first connection portion includes a plurality of the connection areas, and the plurality of the connection areas are spaced apart along the circumference of the collecting plate.

[0014] In some embodiments, there are two connection areas and they are symmetrically arranged relative to the geometric center of the collecting plate.

[0015] In some embodiments, a portion of the collecting plate is bent to define the connecting area.

[0016] In some embodiments, the current collecting plate further includes a second connecting portion and a middle portion, the second connecting portion is suitable for being electrically connected to the cover plate, both ends of the middle 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 middle portion and the second connecting portion are stacked.

[0017] 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.

[0018] In some embodiments, in the first direction, a line connecting the connection between the opposite side walls of the middle portion and the first connecting portion is a first line, and a minimum distance between the identification area and the first line ranges from -2 mm to +2 mm; and / or, in the first direction, a maximum width of the identification area is D3, and a minimum width of the middle portion is D4, wherein 0.2<D3 / D4<1.

[0019] In some embodiments, the identification area is a through hole penetrating the first connecting portion or a groove provided in the first connecting portion.

[0020] In some embodiments, the current collecting plate includes a plate body, a portion of which protrudes toward the pole core to form the first connecting portion protruding toward the pole core and the second connecting portion protruding toward the cover plate on the plate body.

[0021] In some embodiments, the thickness of the second connecting portion is greater than the thickness of the first connecting portion.

[0022] In some embodiments, the thickness of the first connecting portion is L1, and the thickness of the disk body excluding the first connecting portion is L2, wherein 0mm<L2-L1≤0.5mm.

[0023] According to an embodiment of the utility model, 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.

[0024] According to the cover plate assembly of the embodiment of the utility model, 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.

[0025] In some embodiments, the cover plate is provided with a liquid injection hole, and the first connecting portion further includes an avoidance opening for avoiding the liquid injection hole.

[0026] In some embodiments, the minimum distance between the avoidance opening and the injection hole ranges from 0 mm to 10 mm.

[0027] According to the battery cell of the embodiment of the utility model, it includes: a shell, in which a accommodating cavity with an opening is formed; a pole core, the pole core is provided with a pole ear, and the pole core is arranged in the accommodating cavity; a 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.

[0028] According to the battery cell of the embodiment of the utility model, the aforementioned cover plate assembly is adopted to realize the electrical connection between the cover plate and the pole core by 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.

[0029] In some embodiments, the connection area is welded to the tab, and a weld mark is provided at the connection area.

[0030] In some embodiments, in the width direction of the connection area, a plurality of rows of the weld marks are provided in the connection area, each row of the weld marks includes a plurality of weld spots, and the weld spots in adjacent rows are staggered.

[0031] 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.

[0032] In some embodiments, the battery cells are cylindrical batteries.

[0033] The battery assembly according to the embodiment of the present invention includes a plurality of the aforementioned battery cells.

[0034] According to the battery assembly of the embodiment of the utility model, the working performance of the battery assembly is improved by adopting the aforementioned battery monomer.

[0035] The electric device according to the embodiment of the utility model includes the aforementioned battery assembly.

[0036] According to the electric device of the embodiment of the utility model, the working performance of the electric device is improved by adopting the aforementioned battery assembly.

[0037] Additional aspects and advantages of the present invention will become apparent from the following description or will be understood through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0039] Figure 1 This is a schematic diagram of the current collecting plate of some embodiments of the first aspect of the utility model before being folded.

[0040] Figure 2 Schematic diagram of the current collecting plate of some embodiments of the second aspect of the utility model.

[0041] Figure 3 It is a schematic diagram of the cover plate assembly of some embodiments of the first aspect of the utility model, wherein the collecting plate is in an unfolded state.

[0042] Figure 4 It is a schematic diagram of the cover plate assembly of some embodiments of the third aspect of the utility model, wherein the collecting plate is in an unfolded state.

[0043] Figure 5 It is a schematic diagram of the cover plate assembly of some embodiments of the first aspect of the utility model from another angle, wherein the collecting plate is in a folded state.

[0044] Figure 6 It is a schematic diagram of the cover plate assembly of some embodiments of the first aspect of the utility model from another angle, wherein the collecting plate is in a folded state.

[0045] Figure 7 It is a front view of a battery cell according to some embodiments of the present invention.

[0046] Figure 8 Schematic diagram of battery cells according to some embodiments of the present invention.

[0047] Fig. 9 Exploded diagram of a battery cell according to some embodiments of the present invention.

[0048] Reference numerals:

[0049] 1000, battery cell;

[0050] 100. Collecting plate;

[0051] 110. second connecting portion;

[0052] 120. a first connecting portion;

[0053] 121. Connection area;

[0054] 1211, opposite side wall;

[0055] 1212, weld pattern; 1213, weld point;

[0056] 122. Logo area;

[0057] 123. Avoidance;

[0058] 130, middle part; 140, plate body;

[0059] 200, cover plate assembly;

[0060] 210, cover plate; 211, liquid injection hole;

[0061] 220, sealing nail; 230, sealing cover; 240, boss; 250, pole;

[0062] 300, housing;

[0063] 310, accommodating cavity; 311, opening;

[0064] 320, core. DETAILED DESCRIPTION

[0065] The embodiments of the present invention are described in detail below, and 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 invention, and cannot be understood as limiting the present invention.

[0066] In the description of the present invention, 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 invention and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0067] The current collecting plate 100 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0068] like Figure 1 and Figure 2 As shown, a current collecting plate 100 according to an embodiment of the present utility model includes: a first connecting portion 120 .

[0069] Among them, Figure 1 and Figure 2 As shown, the first connecting portion 120 includes a connecting area 121 suitable for being electrically connected to the pole core 320 , and the width of the connecting area 121 increases from the inside to the outside in a direction away from the geometric center of the current collecting plate 100 .

[0070] 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 collector plate 100 and the pole core 320 can be achieved. The specific structure of the pole core 320 can be seen in Fig. 9 .

[0071] It should be noted that the geometric center of the collector plate 100 mentioned above can be understood as a position close to the radial middle of the collector plate 100, and the width of the connection area 121 can be understood as the distance between the two opposite side walls of the connection area 121 in the circumferential direction of the collector plate 100. The width of the connection area 121 increases from the inside to the outside, which means that the width of the portion of the connection area 121 close to the edge of the collector plate 100 is greater than the width of the portion of the connection area 121 close to the geometric center of the collector plate 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 near the edge of the current collecting disk 100 will also increase accordingly. When the width of the portion of the connection area 121 near the edge of the current collecting disk 100 is set to be consistent with the width of the portion of the connection area 121 near the geometric center of the current collecting disk 100, the connection area between the outer pole piece of the pole core 320 and the current collecting disk 100 will be smaller, resulting in low connection strength between the outer pole piece of the pole core 320 and the current collecting disk 100 and increased impedance.

[0072] 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 achieve that the width of the portion of the connection area 121 close to the edge of the current collecting disk 100 is set 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. 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.

[0073] 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 close to the geometric center of the current collecting disk 100 and a large width close to 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.

[0074] It can be seen from the above structure that the current collecting disk 100 of the embodiment of the utility model can make the width of the connection area 121 close to the edge of the current collecting disk 100 greater than the width of the connection area 121 close to the geometric center of the current collecting disk 100 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, so that the width of the connection area 121 close to the edge of the current collecting disk 100 is larger, so that 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.

[0075] 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 collecting disk 100 to be larger than the width of the portion of the connection area 121 close to the geometric center of the 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 collecting disk 100 and the outer pole piece of the pole core 320, improving the connection strength between the collecting disk 100 and the pole core 320, and reducing the connection impedance.

[0076] In the description of the present utility model, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe the features, without any distinction in order or importance.

[0077] In some embodiments, Figure 1 and Figure 2As shown, in the direction away from the geometric center of the current collecting disk 100, the width of the connection area 121 gradually increases from the inside to the outside, 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.

[0078] 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 .

[0079] 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.

[0080] In some embodiments, the connection area 121 is welded to the pole core 320, so that while the connection area 121 and the pole core 320 can form an electrical connection, the connection strength between the connection area 121 and the pole core 320 can be ensured, and the connection difficulty between the connection area 121 and the pole core 320 can be reduced, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0081] In some embodiments, the current collecting plate 100 includes a positive current collecting plate and a negative current collecting plate. The positive current collecting plate is electrically connected to the positive electrode tab of the pole core 320 , and the negative current collecting plate is electrically connected to the negative electrode tab of the pole core 320 to ensure the working performance of the pole core 320 .

[0082] The positive electrode current collector is made of aluminum, and the negative electrode current collector is made of copper.

[0083] 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, and no specific limitation is made here.

[0084] In some embodiments, Figure 1 and Figure 2As shown, the connection area 121 includes two relative side walls 1211 spaced apart, the distance between the two relative side walls 1211 is the width of the connection area 121, and 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.

[0085] 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 2 mm to 6 mm. In other words, the connection area 121 has a maximum width near the edge of the current collecting disk 100, and has a minimum width near the geometric center of the current collecting disk 100. The minimum width of the connection area 121 mentioned here can be understood as Figure 1 As shown in D1, the maximum width of the connection area 121 can be understood as Figure 1 As shown in D2, when the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 is less than 2 mm, under the premise of a certain minimum width of the connection area 121, the connection area between the connection area 121 and the outer pole piece of the pole core 320 cannot be effectively increased; when the difference between the minimum width of the connection area 121 and the maximum width of the connection area 121 is greater than 6 mm, under the premise of a certain minimum width of the connection area 121, the maximum width of the connection area 121 is wider, and when the current collecting plate 100 is formed as Figure 1 When the current collecting plate 100 is formed as Figure 2 When the current collecting plate 100 is removed, the area of ​​the second connecting portion 110 will be reduced, thereby reducing the connection strength between the current collecting plate 100 and the cover plate 210. Under the premise that the maximum width of the connection area 121 is constant, 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.

[0086] 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 to 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.

[0087] 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, 6 mm, or the like.

[0088] In some embodiments, the minimum width ranges from 1 mm to 10 mm. That is, D1 ranges from 1 mm to 10 mm, where, when D1 < 1 mm, on the one hand, the difficulty of forming the connection area 121 will increase, and on the other hand, the connection area between the connection area 121 and the inner pole piece of the pole core 320 can be reduced; when D1 > 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 will be wider, so when the collector plate 100 is formed Figure 1 When the current collecting plate 100 is formed as Figure 2 When the collecting plate 100 is removed, the area of ​​the second connecting portion 110 will be reduced, thereby reducing the connection strength between the collecting plate 100 and the cover plate 210.

[0089] Therefore, the present application sets the minimum width of the connection area 121 to a value range of 1 mm to 10 mm, which reduces the difficulty of forming the connection area 121 and increases the connection area between the connection area 121 and the inner pole piece of the pole core 320. At the same time, 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.

[0090] In specific examples, the minimum width of the connection area 121 is 1 mm, 2 mm, 3 mm, 4 mm, 5 mm, 6 mm, 7 mm, 8 mm, 9 mm, or 10 mm.

[0091] In some embodiments, Figure 1 and Figure 2As shown, 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 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, and can ensure the current flow capacity of the current collecting disk 100, thereby reducing impedance.

[0092] In the description of the present invention, unless otherwise specified, “plurality” means two or more.

[0093] In some embodiments, Figure 1 and Figure 2 As shown, there are two connection areas 121 and they are symmetrically arranged relative to the geometric center of the current collecting plate 100. In this way, while ensuring the connection area between the first connection portion 120 and the pole core 320, the structure of the current collecting plate 100 can be simplified, the manufacturing difficulty of the current collecting plate 100 can be reduced, and the connection points between the current collecting plate 100 and the pole core 320 can be evenly distributed on the pole core 320.

[0094] In some embodiments, a portion of the current collecting plate 100 is bent to define the connection area 121. The difficulty of forming the connection area 121 is reduced, and the connection strength between the connection area 121 and the current collecting plate 100 can be ensured, so that the position of the connection area 121 is stable, thereby ensuring the working performance of the connection area 121, and ensuring that the connection area 121 can effectively realize the electrical connection between the first connection portion 120 and the pole core 320.

[0095] In a specific example, a portion of the 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 .

[0096] In some embodiments, in combination Figure 1 and Figure 5 As shown, the collector plate 100 further includes a second connection portion 110 and a middle portion 130, and both ends of the middle portion 130 are connected to the first connection portion 120 and the second connection portion 110, respectively. In the thickness direction of the collector plate 100, the first connection portion 120, the middle portion 130 and the second connection portion 110 are stacked. The thickness direction mentioned here can also be understood as Figure 1 As shown in the up and down directions, by arranging the first connecting portion 120, the middle portion 130 and the second connecting portion 110 to be stacked in the thickness direction of the current collecting plate 100, it is convenient to use the current collecting plate 100 to connect two structural members (such as the cover plate 210 and the pole core 320) arranged in the up and down directions, thereby reducing the difficulty of connecting the cover plate 210 and the pole core 320 spaced apart in the up and down directions.

[0097] 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.

[0098] In some embodiments, the second connection portion 110 is suitable for being electrically connected to the cover plate 210. Thus, the electrical connection between the current collecting plate 100 and the cover plate 210 is realized, that is, the electrical connection between the pole core 320 and the cover plate 210 is realized, so that the current of the pole core 320 is led out by the cover plate 210, thereby ensuring the working performance of the pole core 320, that is, ensuring the working performance of the battery cell 1000.

[0099] 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 found in Figure 3 , Figure 4 , Figure 5 or Figure 6 , thereby achieving electrical connection between the collecting plate 100 and the cover plate assembly 200.

[0100] In some embodiments, the second connection portion 110 is welded to the cover plate 210, so that while the second connection portion 110 and the cover plate 210 can form an electrical connection, the connection strength between the second connection portion 110 and the cover plate 210 can be ensured, and the connection difficulty between the second connection portion 110 and the cover plate 210 can be reduced, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0101] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, a pole 250 is disposed on the cover plate 210 , the pole 250 penetrates the cover plate 210 , and the second connecting portion 110 is suitable for being electrically connected to the pole 250 .

[0102] In some embodiments, during the processing of the collecting plate 100, the collecting plate 100 is first formed into Figure 1 After the collecting plate 100 is processed, the collecting plate 100 is folded (such as Figure 5 As shown), so that the collecting plate 100 is formed as Figure 6 The shape shown in the figure makes the first connecting portion 120, the middle portion 130 and the second connecting portion 110 of the collecting plate 100 stacked in the thickness direction of the collecting plate 100, which is convenient for realizing the electrical connection between the cover plate 210 and the pole core 320 by using the collecting plate 100, 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 difficulty of molding the collecting plate 100.

[0103] In some embodiments, Figure 1 and Figure 5 As shown, the first connection portion 120 further includes an identification area 122, which is arranged near the connection between the middle portion 130 and the first connection portion 120. That is, the identification area 122 is arranged near the connection between the middle portion 130 and the first connection portion 120, and the identification area 122 helps the staff to quickly determine the position of the connection between the middle portion 130 and the first connection portion 120, so as to facilitate the removal of the collecting plate 100 from the Figure 1 Folded to the shape Figure 5 The shape shown reduces the difficulty of molding the collecting plate 100 and ensures the structural accuracy of the collecting plate 100 after molding, so as to avoid the connection between the middle part 130 and the first connecting part 120 being formed on the connecting area 121. In this way, the area of ​​the connecting area 121 can be guaranteed, thereby ensuring the connection area between the collecting plate 100 and the pole core 320, thereby improving the working performance of the battery cell 1000.

[0104] 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, avoiding the connection between the middle part 130 and the first connecting part 120 to be formed on the connecting area 121, so as to ensure the connection area between the connecting area 121 and the pole core 320.

[0105] In some embodiments, in combination Figure 1 and Figure 5 As shown, the identification area 122 is located between two adjacent connection areas 121 to achieve rational use of the space on the collecting plate 100 and ensure that the identification area 122 can be arranged close to the connection between the middle part 130 and the first connection part 120 .

[0106] In some embodiments, Figure 5 As shown, in the first direction, the line between the opposite side walls of the middle part 130 and the connection point of the first connecting part 120 is the first connecting line T1, and the value range of the minimum distance between the marking area 122 and the first connecting line T1 is -2mm to +2mm. It can also be understood here that the line between the middle part 130 and the first connecting part 120 is the first connecting line T1, and there are multiple distances between the marking area 122 and the first connecting line T1, and the minimum distance is -2mm to +2mm, wherein the minimum distance between the marking area 122 and the first connecting line T1 can also be understood as Figure 5 T2 shown in FIG.

[0107] 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 connecting line T1 is less than -2 mm, the first connecting 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 connecting 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 also causing 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.

[0108] 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, the area of ​​the middle part 130 can also be ensured, 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 disk 100 to ensure the performance of the collecting disk 100.

[0109] 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.

[0110] Alternatively, if Figure 1 As shown, in the first direction, the maximum width of the identification area 122 is D3, and the minimum width of the middle part 130 is D4, wherein 0.2<D3 / D4<1. That is, the maximum width of the identification area 122 is smaller than the minimum width of the middle part 130, and the ratio of the maximum width of the identification area 122 to the minimum width of the middle part 130 is greater than 0.2, so that while avoiding the reduction of the structural strength of the collector plate 100 due to the provision of the identification area 122, it is also possible to ensure that the identification area 122 has a certain width, so as to facilitate the use of limiting the folding position of the collector plate 100 and reduce the difficulty of molding the collector plate 100.

[0111] 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.

[0112] In some embodiments, in combination Figure 1 and Figure 5As shown, the identification area 122 is a through hole penetrating the first connection part 120 or a groove provided on the first connection part 120. That is to say, the identification area 122 can be formed as a through hole penetrating the first connection part 120, or can be formed as a groove provided on the first connection part 120. No specific limitation is made here, as long as it is ensured that the position of the identification area 122 can be visually observed by the staff, so as to facilitate the use of the identification area 122 to determine the folding position of the collecting plate 100.

[0113] 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.

[0114] In some embodiments, Figure 2 As shown, 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 on the plate body 140 . That is to say, it is not limited to setting the collecting plate 100 to include a first connecting portion 120, a middle portion 130 and a second connecting portion 110, and setting the first connecting portion 120, the middle 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, so as 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 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, reduce the difficulty of connecting the cover plate 210 and the pole core 320, and ensure the connection quality between the cover plate 210 and the pole core 320.

[0115] In some embodiments, the thickness of the second connection portion 110 is greater than the thickness of the first connection portion 120. Here, it means that when the second connection portion 110 and the first connection portion 120 are both 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 thickness of the second connection portion 110 is thicker, thereby making the thickness of the main part of the current collecting disk 100 thicker, which is conducive to directly forming the second connection portion 110 and the first connection portion 120 on the current collecting disk 100, avoiding the current collecting disk 100 from breaking during the molding process, and also avoiding the second connection portion 110 from affecting the pole core 320 when welding with the cover plate 210, thereby extending the service life of the pole core 320.

[0116] 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.

[0117] In some embodiments, Figure 2 As shown, 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 will be reduced, causing the collector plate 100 to be easily broken, thereby shortening the service life of the collector plate 100; when the thickness of the first connection portion 120 is greater than 0.8 mm, the difficulty of welding the first connection portion 120 and the pole core 320 will increase.

[0118] 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 and facilitate welding of the first connection portion 120 and the pole core 320, thereby increasing the welding yield.

[0119] 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.

[0120] Alternatively, if Figure 2 As shown, the thickness of the disc body 140 excluding the first connection portion 120 is L2, wherein 0mm<L2-L1≤0.5mm. That is, the thickness of the second connection portion 110 is greater than the thickness of the first connection portion 120, and the difference in thickness between the second connection portion 110 and the first connection portion 120 is less than 0.5mm, which can avoid the first connection portion 120 being thicker, thereby avoiding that part of the structure of the disc body 140 cannot effectively protrude toward the direction of the pole core 320 to form the first connection portion 120, reducing the difficulty of molding the collector disc 100, and also reducing the weight of the collector disc 100 and the production cost of the collector disc 100.

[0121] 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.

[0122] The cap plate assembly 200 for the battery cell 1000 according to an embodiment of the present invention will be described below with reference to the accompanying drawings.

[0123] Combination Figure 3-Figure 6 As shown, a cap plate assembly 200 for a battery cell 1000 according to an embodiment of the present invention includes: a cap plate 210 and a current collecting plate 100 .

[0124] The cover plate 210 includes an electrical lead-out terminal, which may be a pole 250 or the cover plate 210 itself.

[0125] Combination Figure 3-Figure 6As shown, the current collecting plate 100 is the aforementioned current collecting plate 100, and the specific structure of the current collecting plate 100 is not described here, and the current collecting plate 100 is connected to the electrical lead-out terminal, thereby realizing electrical connection between the current collecting plate 100 and the cover plate 210, so as to lead out the current of the pole core 320.

[0126] In some embodiments, the second connection portion 110 of the current collecting tray 100 is connected to the electrical lead-out terminal, which can reduce the difficulty of electrical connection between the current collecting tray 100 and the cover plate 210 while achieving electrical connection between the current collecting tray 100 and the cover plate 210 .

[0127] It can be seen from the above structure that the cover plate assembly 200 of the embodiment of the utility model, 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 reduce the connection impedance, which is beneficial to improving the working performance of the battery cell 1000.

[0128] In some embodiments, Figure 3 , Figure 5 and Figure 6 As shown, the cover plate 210 is provided with a liquid injection hole 211, and the first connection part 120 further includes a avoidance opening 123 for avoiding the liquid injection hole 211. Among them, by providing the liquid injection hole 211 on the cover plate 210, it is convenient to inject liquid toward the pole core 320 through the liquid injection hole 211, thereby ensuring the working performance of the pole core 320; by providing the avoidance opening 123 for avoiding the liquid injection hole 211 on the first connection part 120, it is possible to avoid the first connection part 120 blocking the liquid injection of 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.

[0129] 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 rebounding and overflowing during injection can be prevented, and the injection efficiency can be improved.

[0130] 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 portion 120 for avoiding the injection hole 211 to ensure the injection effect, thereby improving the injection efficiency.

[0131] In some embodiments, Figure 5 and Figure 6 As shown, a boss 240 is provided on one side of the cover plate 210 and is arranged around the outer 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.

[0132] In some embodiments, the minimum spacing between the avoidance opening 123 and the injection hole 211 ranges from 0 mm to 10 mm. In this way, while avoiding interference between the collecting plate 100 and the injection hole 211, the area of ​​the collecting plate 100 can be ensured, thereby ensuring the welding area between the collecting plate 100 and the pole core 320, and improving the welding effect.

[0133] It should be noted that if Figure 5 and Figure 6 As shown, when the outer periphery of the injection hole 211 is provided with a boss 240, the minimum distance between the avoidance opening 123 and the injection hole 211 mentioned above can be understood as the minimum distance between the avoidance opening 123 and the boss 240, that is, Figure 6 As shown in T3 , this can prevent the collecting plate 100 from blocking the injection hole 211 and prevent the collecting plate 100 from interfering with the boss 240 , thereby reducing the welding thermal deformation of the connection area 121 .

[0134] In a specific example, the minimum distance between the avoidance opening 123 and the injection hole 211 is 1 mm, 3 mm, 5 mm, or 10 mm.

[0135] In some embodiments, in combination Figure 3 , Figure 8 and Fig. 9 As shown, 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 block 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.

[0136] At the same time, by sealing the outlet of the injection hole 211 with the sealing nail 220, 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.

[0137] 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, 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. In this way, the structures of the positive cover plate assembly and the negative cover plate assembly are consistent, thereby facilitating processing using a unified mold and reducing the molding difficulty of the cover plate assembly 200.

[0138] The battery cell 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0139] Combination Figure 7 , Figure 8 and Fig. 9 As shown, a battery cell 1000 according to an embodiment of the present invention includes: a housing 300 , a pole core 320 and a cover plate assembly 200 .

[0140] Among them, Fig. 9 As shown, a receiving cavity 310 having an opening 311 is formed in the housing 300 .

[0141] like Fig. 9 As shown, the pole core 320 is provided with a pole ear, and the pole core 320 is arranged in the accommodating cavity 310. Thus, the pole core 320 is arranged in the shell 300, so that the shell 300 is used to protect the pole core 320, prolong the service life of the pole core 320, and improve the safety of the use of the pole core 320.

[0142] like Fig. 9 As shown, the cover plate assembly 200 is the aforementioned cover plate assembly 200, and the specific structure of the cover plate assembly 200 is not described here in detail. The cover plate 210 is arranged at the opening 311, and the current collecting plate 100 is arranged between the pole ear and the cover plate 210, and the current collecting plate 100 is respectively electrically connected to the pole ear and the cover plate 210. Thus, the pole ear and the cover plate 210 are electrically connected, that is, the pole core 320 and the cover plate 210 are electrically connected, and the working performance of the battery cell 1000 is ensured.

[0143] In some embodiments, the second connection portion 110 of the current collecting plate 100 is connected to the cover plate 210, and the first connection portion 120 of the current collecting plate 100 is electrically connected to the pole ear. In this way, while achieving electrical connection between the current collecting plate 100 and the pole ear and the cover plate 210, it can also reduce the difficulty of electrical connection between the current collecting plate 100 and the pole ear and the cover plate 210, and ensure the quality of electrical connection between the current collecting plate 100 and the pole ear and the cover plate 210.

[0144] The electrical connection between the collecting plate 100 and the cover plate 210 mentioned here can be understood as the electrical connection between the collecting plate 100 and the electrical lead-out terminal.

[0145] It can be seen from the above structure that the battery cell 1000 of the embodiment of the utility model 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, while reducing the connection impedance and improving the working performance of the battery cell 1000.

[0146] In some embodiments, the housing 300 is formed by stamping or welding, and the housing 300 is made of aluminum or steel.

[0147] In some embodiments, the connection area 121 is welded to the tab, and a welding mark 1212 is provided at the connection area 121 (the specific structure of the welding mark 1212 can be seen in Figure 1 and Figure 2 ). It can also be understood here that after the connection area 121 is welded to the pole ear, a weld mark 1212 is formed at the connection area 121, wherein the welding connection can not only realize the electrical connection between the connection area 121 and the pole ear, but also ensure the connection strength between the connection area 121 and the pole ear, so that the relative position of the connection area 121 and the pole ear is stable, thereby ensuring the working performance of the battery cell 1000.

[0148] In some embodiments, the connection area 121 and the tab are welded together by pulse spot welding.

[0149] When the connection area 121 and the tab are welded together by pulse spot welding, Figure 1 and Figure 2 As shown, the welding pattern 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 pole ear.

[0150] In some other embodiments, the connection area 121 and the tab are welded by laser beam. When the connection area 121 and the tab are welded by laser beam, the weld line 1212 is formed into a weld line (not shown in the figure).

[0151] In some embodiments, in combination Figure 1 and Figure 2 As shown, in the width direction of the connection area 121, multiple rows of weld lines 1212 are provided in the connection area 121, each row of weld lines 1212 includes multiple welding points 1213, and the welding points 1213 in adjacent rows are arranged in a staggered manner. Among them, by arranging multiple rows of weld lines 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 welding points 1213 in adjacent rows, on the one hand, the welding points 1213 in adjacent rows can be prevented from interfering with each other, thereby reducing the thermal influence between the welding points 1213, improving the welding yield, and making the distribution of the multiple welding points 1213 more uniform and lower in impedance, and on the other hand, it can also ensure that the cooperation of the multiple welding points 1213 in adjacent rows can make each layer of the pole piece of the pole core 320 electrically connected to the current collecting plate 100, thereby ensuring the connection quality between the pole core 320 and the current collecting plate 100.

[0152] 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 marks 1212, in the width direction of the connection area 121, the welds 1213 of one row of weld marks 1212 are directly opposite to the position between the two welds 1213 of the other row of weld marks 1212, thereby avoiding mutual interference between the welds 1213 in the adjacent rows during the welding process, reducing the thermal influence between the welds 1213, and improving the welding yield, while also ensuring that each layer of the pole piece in the radial direction of the pole core 320 can be electrically connected to the collecting plate 100.

[0153] 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 opposite to each other in the width direction of the connection area 121 .

[0154] It should be noted that when adjacent rows of welding points 1213 are arranged opposite to 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 plate 100, ensuring the connection quality between the pole core 320 and the collecting plate 100, and facilitating improving the working performance of the pole core 320.

[0155] In some embodiments, in combination Figure 1 and Figure 2 As shown, 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 area 121 and the outer pole piece of the pole core 320 is increased, the connection strength between the current collecting disk 100 and the pole core 320 is improved, and the connection impedance is reduced.

[0156] It should be noted that Figure 1 and Figure 2 The example in which the number of weld marks 1212 near the edge of the current collecting plate 100 is three rows and the number of weld marks 1212 near the geometric center of the current collecting plate 100 is two rows is shown for illustration. However, in some other embodiments, the number of weld marks 1212 near the edge of the current collecting plate 100 can be set to four rows and the number of weld marks 1212 near the geometric center of the current collecting plate 100 can be set to three rows, or the number of weld marks 1212 near the edge of the current collecting plate 100 can be set to four rows and the number of weld marks 1212 near the geometric center of the current collecting plate 100 can be set to two rows. No specific limitation is made here, as long as the number of weld marks 1212 near the edge of the current collecting plate 100 is greater than the number of weld marks 1212 near the geometric center of the current collecting plate 100.

[0157] In some embodiments, in combination Figure 7 , Figure 8 and Fig. 9 As shown, the battery cell 1000 is a cylindrical battery, so that the battery cell 1000 has the advantages of high capacity, long cycle life, and wide operating environment temperature range, thereby ensuring the working performance of the battery cell 1000.

[0158] The battery assembly of the embodiment of the utility model is described below.

[0159] A battery assembly according to an embodiment of the present invention includes: a plurality of battery cells 1000 .

[0160] The battery cell 1000 is the aforementioned battery cell 1000 , and the specific structure of the battery cell 1000 is not described in detail herein.

[0161] It can be seen from the above structure that the battery assembly of the embodiment of the present invention improves the working performance of the battery assembly by adopting the aforementioned battery cell 1000.

[0162] It should be noted that the battery assembly mentioned here can be a battery pack or a battery module.

[0163] The electrical device of the embodiment of the utility model is described below.

[0164] An electrical device according to an embodiment of the utility model includes: a battery assembly.

[0165] Among them, the battery assembly is the aforementioned battery assembly, and the specific structure of the battery assembly is not described here.

[0166] It can be seen from the above structure that the electrical device of the embodiment of the utility model improves the working performance of the electrical device by adopting the above-mentioned battery assembly.

[0167] It should be noted that the electrical devices mentioned here may be but are not limited to mobile phones, tablets, laptops, electric toys, electric tools, battery vehicles, electric vehicles, ships, spacecraft, etc.

[0168] 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.

[0169] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0170] Figure 1 and Figure 2 Two connection areas 121 are shown 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 protection scope of the present utility model.

[0171] The specific structures of the current collecting plate 100, the cover plate assembly 200, the battery cell 1000, the battery assembly and other components of the electrical device such as the pole core 320 according to the embodiment of the utility model are well known to ordinary technicians in the field and will not be described in detail here.

[0172] In the description of this specification, the description with reference to the terms "embodiment", "example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0173] Although the embodiments of the present invention 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 spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A collecting plate, characterized in that: include: The first connecting portion includes a connecting area suitable for being electrically connected 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 collecting plate.

2. The collecting plate according to claim 1, characterized in that: The connection area has a maximum width close to the edge of the current collecting disk and a minimum width close to 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.

3. The collecting plate according to claim 2, characterized in that: The minimum width has a value range of 1 mm to 10 mm.

4. The collecting plate according to claim 1, characterized in that: The first connection portion includes a plurality of connection areas, and the plurality of connection areas are arranged at intervals along the circumference of the current collecting plate.

5. The collecting plate according to claim 4, characterized in that: There are two connection areas, which are symmetrically arranged relative to the geometric center of the collecting plate.

6. The collecting plate according to claim 5, characterized in that: A portion of the collecting plate is bent to define the connecting area.

7. The current collecting plate according to any one of claims 1 to 6, characterized in that: It also includes a second connection part and a middle part, the second connection part is suitable for being electrically connected to the cover plate, both ends of the middle part are respectively connected to the first connection part and the second connection part, and in the thickness direction of the collecting plate, the first connection part, the middle part and the second connection part are stacked.

8. The collecting plate according to claim 7, characterized in that: The first connecting portion further includes a marking area, and the marking area is arranged close to a connection between the middle portion and the first connecting portion.

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

10. The collecting plate according to claim 8, characterized in that: The marking area is a through hole penetrating the first connecting portion or a groove provided in the first connecting portion.

11. The current collecting plate according to any one of claims 1 to 6, characterized in that: The current collecting plate includes a plate body, a portion of which protrudes toward the pole core to form the first connecting portion protruding toward the pole core and the second connecting portion protruding toward the cover plate on the plate.

12. The collecting plate according to claim 11, characterized in that: The second connection portion has a thickness greater than that of the first connection portion.

13. The collecting plate according to claim 11, characterized in that: The thickness of the first connection portion is L1, and the thickness of the disk body excluding the first connection portion is L2, wherein 0mm<L2-L1≤0.5mm.

14. A cover plate assembly, characterized in that: include: A cover plate, the cover plate comprising an electrical lead-out terminal; A current collecting disk, wherein the current collecting disk is the current collecting disk according to any one of claims 1 to 13, and the current collecting disk is connected to the electrical lead-out terminal.

15. The cover plate assembly according to claim 14, characterized in that: The cover plate is provided with a liquid injection hole, and the first connecting portion further comprises an avoidance opening for avoiding the liquid injection hole.

16. The cover plate assembly according to claim 15, characterized in that: The minimum distance between the avoidance opening and the injection hole ranges from 0 mm to 10 mm.

17. A battery cell, characterized in that: include: A housing having an opening formed in the housing; A pole core, wherein the pole core is provided with a pole ear, and the pole core is arranged in the accommodating cavity; A cover plate assembly, wherein the cover plate assembly is the cover plate assembly according to any one of claims 14-16, wherein 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.

18. The battery cell according to claim 17, characterized in that: The connection area is welded to the pole ear, and a welding mark is provided at the connection area.

19. The battery cell according to claim 18, characterized in that: In the width direction of the connection area, a plurality of rows of the welding lines are arranged in the connection area, each row of the welding lines includes a plurality of welding spots, and the welding spots in adjacent rows are arranged in a staggered manner.

20. The battery cell according to claim 19, characterized in that: 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.

21. The battery cell according to any one of claims 17 to 20, characterized in that: The battery cell is a cylindrical battery.

22. A battery assembly, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 17 to 21.

23. An electrical device, characterized in that: Comprising a battery assembly according to claim 22.

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