Cover plate assembly for battery cell, battery cell, battery assembly, and electric device

Abstract

A cover plate assembly (200) for a battery cell (1000), a battery cell (1000), a battery assembly (10), and an electric device (1). The cover plate assembly (200) for the battery cell (1000) comprises a cover plate body (210), a terminal post (250), an insulating member (400), and a buffer member (500); a mounting opening (212) is formed on the cover plate body (210); the terminal post (250) passes through the mounting opening (212); the insulating member (400) is arranged at the mounting opening (212) and is located between the terminal post (250) and the cover plate body (210) so that the cover plate body (210) and the terminal post (250) are insulated and spaced; the terminal post (250) is provided with a first limiting portion (251) located on one side of the cover plate body (210); the first limiting portion (251) is used for limiting and fixing the terminal post (250) and the insulating member (400) relative to the cover plate body (210); and the buffer member (500) is arranged between the insulating member (400) and the first limiting portion (251). The cover plate assembly (200) for the battery cell (1000) can, to a certain extent, prevent the first limiting portion (251) from directly pressing the insulating member (400) during a molding process, and distribute and buffer the pressing force exerted by the first limiting portion (251) on the insulating member (400), thereby preventing the insulating member (400) from being cracked, ensuring the working performance of the insulating member (400); moreover, said cover plate assembly can also support the first limiting portion (251), thereby improving the structural strength of the first limiting portion (251) after molding.

Description

Battery cell cover 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 202420635714.9 and application name “Cover assembly of battery cell, 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 battery cell cover assembly, a battery cell, a battery assembly, and an electrical device. Background Art

[0003] In the existing battery cell cover assembly, in order to achieve insulation cooperation between the pole and the cover body, an insulating member is usually provided between the pole and the cover body.

[0004] However, the insulating parts of the existing poles are easily damaged during the molding process, which shortens the service life of the insulating parts and reduces the insulation performance of the insulating parts.

[0005] Summary of the Invention

[0006] This application aims to solve at least one of the technical problems existing in the prior art. To this end, the first purpose of this application is to provide a cover plate assembly for a battery cell. The cover plate assembly can, to a certain extent, prevent the terminal from damaging the insulating part during the molding process and facilitates the fixed support of the terminal, thus solving the technical problem in the prior art that the insulating part is easily damaged during the molding process of the terminal.

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

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

[0009] The fourth objective of the present application is to provide an electrical device having the above-mentioned battery assembly.

[0010] According to the embodiment of the present application, the cover assembly of the battery cell includes: a cover body, which is provided with a mounting opening; a pole, which is passed through the mounting opening; an insulating member, which is provided at the mounting opening and located between the pole and the cover body to insulate the cover body and the pole, and the pole has a first limiting portion located on one side of the cover body, and the first limiting portion is used to limit and fix the pole and the insulating member to the cover body; a buffer member, which is provided between the insulating member and the first limiting portion.

[0011] According to the cover plate assembly of the battery cell in the embodiment of the present application, a buffer member is provided between the insulating member and the first limiting portion. In this way, during the molding process of the first limiting portion, the buffer member can be used to limit and support the first limiting portion, thereby improving the structural strength of the first limiting portion and ensuring the position stability of the first limiting portion, thereby improving the position stability of the pole and ensuring the performance of the pole; at the same time, because the buffer member is provided between the insulating member and the first limiting portion, it can also avoid the first limiting portion from directly squeezing the insulating member during the molding process to a certain extent, and can also use the buffer member to disperse and buffer the extrusion force applied to the insulating member by the first limiting portion during the molding process, thereby avoiding the first limiting portion from damaging the insulating member to a certain extent, extending the service life of the insulating member, and ensuring the insulation performance of the insulating member.

[0012] In some embodiments, the buffer member is provided with a receiving groove, and at least a portion of the first limiting portion is provided in the receiving groove, so that at least a portion of the buffer member is located at the periphery of the first limiting portion.

[0013] In some embodiments, the thickness H1 of the first limiting portion ranges from 0.5 mm to 1.5 mm.

[0014] In some embodiments, the thickness H2 of at least part of the buffer located at the periphery of the first limiting portion is greater than the thickness H1 of the first limiting portion; and / or the width H3 of at least part of the buffer located at the periphery of the first limiting portion is in the range of 1mm-3mm.

[0015] In some embodiments, the outer surface of the first limiting portion is flush with the outer surface of the buffer component located at the outer periphery of the first limiting portion.

[0016] In some embodiments, the width H4 of the accommodating groove ranges from 0.2 mm to 2 mm; and / or the distance H5 between the bottom wall of the accommodating groove and the bottom wall of the buffer member ranges from 0.4 mm to 2.5 mm.

[0017] In some embodiments, the pole and the buffer are connected by welding.

[0018] In some embodiments, the pole is a hollow member to define a liquid injection channel, the liquid injection channel is provided with an inlet and an outlet, and at least one of the inlet and the outlet is provided with a blocking member for closing the inlet and the outlet.

[0019] In some embodiments, both the inlet and the outlet are provided with blocking members.

[0020] In some embodiments, in the radial direction of the pole, the buffer component and the insulating component are positionally matched to limit the movement of the buffer component.

[0021] In some embodiments, the insulating member is provided with a first annular protrusion, and the first protrusion is arranged around the outer peripheral wall of the buffer member.

[0022] In some embodiments, the insulating member is provided with a second protrusion protruding toward the buffer member, and the insulating member is provided with a stop surface located on the inner side of the second protrusion facing the installation opening; the buffer member is provided with a mating groove, the second protrusion cooperates with the mating groove, and a portion of the buffer member is mated with the stop surface.

[0023] In some embodiments, the depth H6 of the mating groove ranges from 0.3 mm to 1 mm.

[0024] In some embodiments, the matching groove and the accommodating groove are spaced apart in the thickness direction of the buffer.

[0025] In some embodiments, in the radial direction of the buffer, the minimum spacing H7 between the mating groove and the accommodating groove is 0.35mm-1.5mm; and / or, in the axial direction of the buffer, the recessed depth of the mating groove is smaller than the distance between the bottom wall of the accommodating groove and the bottom wall of the buffer.

[0026] According to the battery cell of the embodiment of the present application, it includes: a shell; a cover plate assembly, the cover plate assembly is arranged at the end of the shell, and the cover plate assembly is the aforementioned cover plate assembly; a pole core, the pole core is arranged in the shell, and the pole core is provided with a first connecting pole ear, and the first connecting pole ear is electrically connected to the pole column.

[0027] According to the battery cell of the embodiment of the present application, the operating performance of the battery cell can be guaranteed by adopting the aforementioned cover plate assembly.

[0028] In some embodiments, the battery cell further includes a current collecting plate, which is disposed between the first connecting tab and the cover plate assembly, and is electrically connected to the first connecting tab and the pole, respectively.

[0029] In some embodiments, the current collecting disk includes a disk body, at least a portion of which protrudes toward the pole core to form a first connecting portion protruding toward the cover plate assembly and a second connecting portion protruding toward the pole core on the disk body, the first connecting portion being electrically connected to the pole column, and the second connecting portion being electrically connected to the first connecting pole ear.

[0030] In some embodiments, the thickness of the first connection portion is greater than the thickness of the second connection portion; and / or, the thickness of the second connection portion L1 = 0.1 mm to 0.8 mm, and the thickness of the first connection portion is L2, wherein 0 mm < L2 - L1 ≤ 0.5 mm.

[0031] In some embodiments, the current collecting plate includes a first connecting portion, an intermediate portion, and a second connecting portion. The first connecting portion, the intermediate portion, and the second connecting portion are stacked axially in the pole core. The first connecting portion is electrically connected to the pole column, and the second connecting portion is electrically connected to the first connecting pole ear.

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

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

[0034] According to the battery assembly of the embodiment of the present application, the aforementioned battery cells are adopted to ensure the working performance of the battery assembly.

[0035] An electrical device according to an embodiment of the present application includes the aforementioned battery assembly.

[0036] According to the electric device of the embodiment of the present application, the aforementioned battery assembly is adopted to ensure the working performance of the electric device and enhance the user experience.

[0037] 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

[0038] 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:

[0039] FIG1 is a schematic diagram of a cover assembly and a housing in some embodiments of the present application.

[0040] FIG2 is an exploded view of the cover assembly and the housing according to some embodiments of the present application.

[0041] FIG3 is a cross-sectional view of a portion of a battery cell according to some embodiments of the present application.

[0042] FIG4 is a partial enlarged view of area I in FIG3 .

[0043] FIG5 is a schematic diagram of a buffer member according to some embodiments of the present application.

[0044] FIG. 6 is a schematic diagram of a buffer member according to some embodiments of the present application from another angle.

[0045] FIG. 7 is an exploded view of a battery cell according to some embodiments of the present application.

[0046] FIG8 is a schematic diagram of a current collecting plate according to some embodiments of the present application.

[0047] FIG9 is a schematic diagram of the current collecting disk and the negative electrode cover plate in some other embodiments of the present application, wherein the current collecting disk is in an unfolded state.

[0048] FIG10 is a schematic diagram of a current collecting tray according to some other embodiments of the present application, wherein the current collecting tray is in a folding process.

[0049] FIG11 is a schematic diagram of a battery assembly according to some embodiments of the present application.

[0050] FIG12 is a schematic diagram of an electrical device according to some embodiments of the present application.

[0051] 1. Electrical device; 10. Battery assembly; 1000. Battery cell; 100. Current collecting tray; 110. First connecting portion; 120. Second connecting portion; 122. Identification area; 130. Intermediate portion; 140. Tray body; 200. Cover assembly; 210. Cover body; 212. Mounting port; 250. Post; 251. First limiting portion; 252. Second limiting portion; 211. Liquid injection channel; 2111. Inlet; 2112. Outlet; 260. Negative electrode cover; 270. Top spacer; 400. Insulator; 410. First protrusion; 420. Second protrusion; 421. Stop surface; 430. Insulator sheet; 440. Sealing ring; 500. Buffer; 510. Accommodating groove; 520. Matching groove; 300, outer shell; 320, pole core; 321, first connecting pole ear; 600, sealing piece; 220, sealing nail; 230, sealing cover; 700, explosion-proof valve; 800, protective sheet. Specific embodiments

[0052] 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.

[0053] 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.

[0054] The cap plate assembly 200 of the battery cell 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0055] 1 , 2 and 3 , the cap plate assembly 200 of the battery cell 1000 according to an embodiment of the present application includes a cap plate body 210 , a terminal post 250 , an insulating member 400 and a buffer member 500 .

[0056] As shown in FIG. 2 , a mounting opening 212 is provided on the cover body 210 .

[0057] 1 , 2 and 3 , the pole 250 is passed through the mounting opening 212 . It can also be understood that the pole 250 is mounted on the cover body 210 through the mounting opening 212 , thereby reducing the difficulty of assembling the pole 250 and the cover body 210 .

[0058] In some embodiments, the pole 250 is made of aluminum, which is connected to the collecting plate 100 (the specific structure of the collecting plate 100 can be seen in Figure 7), and the collecting plate 100 is connected to the pole core 320, thereby realizing the electrical connection between the pole 250 and the pole core 320, making it convenient to use the pole 250 to draw out the current of the pole core 320 to ensure the working performance of the pole core 320.

[0059] As shown in Figures 2 and 3 , an insulating member 400 is disposed in the mounting opening 212 and is located between the terminal post 250 and the cover body 210 to insulate the cover body 210 from the terminal post 250. The terminal post 250 has a first stopper 251 located on one side of the cover body 210. The first stopper 251 is used to positionally secure the terminal post 250 and the insulating member 400 to the cover body 210. The insulating member 400 provides an insulated separation between the cover body 210 and the terminal post 250, thereby preventing electrical connection between the cover body 210 and the terminal post 250 to a certain extent, thereby ensuring the operating performance of the battery cell 1000.

[0060] At the same time, by providing a first limiting portion 251 on the pole 250 on one side of the cover body 210, and configuring the first limiting portion 251 to be used for limiting and fixing the pole 250 and the insulating member 400 to the cover body 210, the limiting cooperation of the pole 250 and the cover body 210 and the limiting cooperation of the insulating member 400 and the cover body 210 are achieved, so as to achieve the fixing of the pole 250 and the insulating member 400 on the cover body 210, so that the position of the pole 250 and the insulating member 400 is stable, thereby ensuring the working performance of the pole 250 and the insulating member 400.

[0061] In some embodiments, as shown in Figure 3, the pole 250 also has a second limiting portion 252 located on the other side of the cover body 210, and the first limiting portion 251 and the second limiting portion 252 are respectively arranged on opposite sides of the cover body 210, so as to achieve the fixation of the pole 250 on the cover body 210, facilitate the use of the cover body 210 to support the pole 250, improve the position stability of the pole 250, and also achieve the use of the pole 250 to limit and fix the insulating member 400 on the cover body 210, and at the same time facilitate the use of the pole 250 to lead out the current of the pole core 320.

[0062] 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.

[0063] In some embodiments, the pole 250 is formed by piercing to form a first limiting portion 251 and a second limiting portion 252 on the pole 250 , and the first limiting portion 251 and the second limiting portion 252 can be respectively arranged on opposite sides of the cover body 210 .

[0064] In some embodiments, as shown in Figures 2 and 3, the insulating member 400 includes an insulating sheet 430 and a sealing ring 440. The insulating sheet 430 is arranged on one side of the cover body 210 and part of the structure of the insulating sheet 430 extends into the installation opening 212. The sealing ring 440 is arranged on the other side of the cover body 210 and part of the structure of the sealing ring 440 extends into the installation opening 212, so as to realize that the insulating member 400 is arranged in the installation opening 212 and is located between the pole 250 and the cover body 210, thereby realizing the insulation spacing between the cover body 210 and the pole 250, and reducing the difficulty of installing the insulating member 400 and the cover body 210.

[0065] In some embodiments, as shown in FIG. 3 and FIG. 5 , the insulating sheet 430 is disposed on the outer side of the cover body 210 , and the sealing ring 440 is disposed on the inner side of the cover body 210 .

[0066] In some embodiments, the insulating sheet 430 is injection molded with a high-performance thermoplastic resin, such as polyphenylene sulfide, to ensure the insulating performance of the insulating sheet 430, so that the cover body 210 and the pole 250 can effectively form an insulating gap, thereby improving the working performance of the battery cell 1000; the sealing ring 440 is made of fluororubber, EPDM rubber or fusible polytetrafluoroethylene, so that while ensuring the insulating performance of the sealing ring 440, the sealing ring 440 can also have a certain sealing performance, provide a sealing function for the pole 250, and to a certain extent avoid the overflow of electrolyte in the battery cell 1000.

[0067] As shown in FIG. 3 , the buffer member 500 is disposed between the insulating member 400 and the first limiting portion 251 .

[0068] It should be noted that since the pole 250 is made through a pier forming process, during the forming process of the pole 250, part of the pole 250 needs to be bent toward the insulating part 400 to form the first limiting portion 251. However, due to the low structural strength of the insulating part 400, the first limiting portion 251 cannot be supported during the forming process of the first limiting portion 251, which reduces the structural strength of the first limiting portion 251 after forming. In addition, there is also the problem of squeezing the insulating part 400 during the forming process of the first limiting portion 251, which can easily cause damage to the insulating part 400.

[0069] Therefore, the present application sets a buffer part 500 between the insulating part 400 and the first limiting part 251, so that during the molding process of the first limiting part 251, the buffer part 500 can be used to limit and support the first limiting part 251, thereby improving the structural strength of the first limiting part 251 after molding, and ensuring the position stability of the first limiting part 251, thereby improving the position stability of the pole 250 and ensuring the performance of the pole 250. At the same time, it can also avoid the first limiting part 251 from directly squeezing the insulating part 400 during the molding process to a certain extent, and can also use the buffer part 500 to disperse and buffer the extrusion force applied by the first limiting part 251 to the insulating part 400 during the molding process, thereby avoiding the first limiting part 251 from squeezing the insulating part 400 to a certain extent, extending the service life of the insulating part 400, and ensuring the insulation performance of the insulating part 400.

[0070] That is to say, by providing the buffer part 500, the present application can, to a certain extent, avoid the first limiting part 251 from directly squeezing the insulating part 400 during the forming process while ensuring the structural strength of the first limiting part 251 after forming. At the same time, the buffer part 500 can also be used to disperse and buffer the squeezing force applied by the first limiting part 251 on the insulating part 400, thereby avoiding damage to the insulating part 400 to a certain extent, so as to ensure the insulation performance of the insulating part 400, thereby ensuring the working performance of the battery cell 1000.

[0071] It can be seen from the above structure that the cover plate assembly 200 of the battery cell 1000 of the embodiment of the present application can ensure the structural strength of the first limiting part 251 after molding by setting the buffer part 500 between the insulating part 400 and the first limiting part 251. At the same time, it is convenient to use the buffer part 500 to support the first limiting part 251, thereby improving the position stability of the first limiting part 251, and can also make the force of the first limiting part 251 during the molding process applied to the buffer part 500, and use the buffer part 500 to disperse and buffer the extrusion force applied by the first limiting part 251 on the insulating part 400. At the same time, it can also avoid the first limiting part 251 directly squeezing the insulating part 400 during the molding process to cause damage to the insulating part 400 to a certain extent, so as to ensure the insulation performance of the insulating part 400, thereby ensuring the working performance of the battery cell 1000.

[0072] It can be understood that compared with the prior art, the present application sets a buffer part 500 between the insulating part 400 and the first limiting part 251 to ensure the structural strength of the first limiting part 251 after molding, and to a certain extent avoid the first limiting part 251 directly squeezing the insulating part 400 during the molding process to cause damage to the insulating part 400, and to achieve the dispersion and buffering of the extrusion force applied by the first limiting part 251 on the insulating part 400, thereby ensuring the insulation performance of the insulating part 400.

[0073] In some embodiments, the buffer member 500 is stamped and formed from aluminum. While reducing the difficulty of forming the buffer member 500, it can also make the buffer member 500 have a certain structural strength, so that it is convenient to use the buffer member 500 to limit and support the first limiting portion 251, thereby improving the structural strength of the first limiting portion 251 after forming, and to a certain extent avoiding the first limiting portion 251 directly squeezing the insulating member 400 during the forming process to cause damage to the insulating member 400, thereby extending the service life of the insulating member 400.

[0074] It should be noted that the aluminum material mentioned above can be 1 series aluminum or other series aluminum, and is not specifically limited here.

[0075] In some embodiments, as shown in Figure 2, the cover assembly 200 also includes an explosion-proof valve 700, which is provided on the cover body 210. The explosion-proof valve 700 is used to rupture when the internal pressure of the battery cell 1000 is large, so as to discharge the pressure in the battery cell 1000, thereby improving the safety of the battery cell 1000.

[0076] In some embodiments, as shown in Figures 1 and 2, the cover assembly 200 also includes a protective sheet 800, which is arranged on the outside of the explosion-proof valve 700 to protect the explosion-proof valve 700 and to a certain extent prevent external foreign matter from damaging the explosion-proof valve 700, thereby ensuring the performance of the explosion-proof valve 700.

[0077] In some embodiments, in combination with Figures 2 and 3, the cover assembly 200 also includes a top spacer 270, which is made of polypropylene and is arranged on the other side of the cover body 210, and part of the structure of the top spacer 270 is located between the second limiting portion 252 of the pole 250 and the cover body 210, so that the top spacer 270 can be used to provide insulation function for the pole 250 and the cover body 210. At the same time, the top spacer 270 can also be used to protect the explosion-proof valve 700, to a certain extent prevent the pole core 320 from causing damage to the explosion-proof valve 700, thereby ensuring the performance of the explosion-proof valve 700.

[0078] In some embodiments, the pole 250 and the buffer 500 are welded to achieve a fixed connection between the pole 250 and the buffer 500, while also ensuring the connection strength between the pole 250 and the buffer 500, making it easier to use the buffer 500 to support the pole 250, improve the positional stability of the pole 250, and ensure the structural strength of the pole 250 after forming.

[0079] The welding mentioned here may be laser welding.

[0080] In some embodiments, as shown in conjunction with Figures 3, 4, and 5, the buffer member 500 is provided with a receiving groove 510, and at least a portion of the first limiting portion 251 is provided in the receiving groove 510, so that at least a portion of the buffer member 500 is located on the periphery of the first limiting portion 251. This means that when at least a portion of the first limiting portion 251 is provided in the receiving groove 510, at least a portion of the buffer member 500 can be provided on the periphery of the first limiting portion 251, so that the buffer member 500 can be used to isolate the pole 250, to a certain extent preventing the pole 250 from directly squeezing the insulating member 400 during the molding process and causing the insulating member 400 to crack, thereby to a certain extent avoiding the risk of leakage and poor insulation withstand voltage.

[0081] In some embodiments, the pole 250 is riveted to the buffer 500. By providing a receiving groove 510 on the buffer 500, during the matching process between the pole 250 and the buffer 500, the receiving groove 510 can be used to provide space for the flipping of the first limiting portion 251, thereby reducing the difficulty of forming the first limiting portion 251. In addition, during the flipping process of the first limiting portion 251, it can be ensured that the flanging force of the pole 250 can be applied to the buffer 500, thereby dispersing and buffering the extrusion force applied by the pole 250 on the insulating part 400, and to a certain extent avoiding the buffer 500 directly squeezing the insulating part 400 to crack the insulating part 400, thereby to a certain extent avoiding the risk of leakage and poor insulation withstand voltage.

[0082] At the same time, due to the presence of the buffer member 500 , it is also possible to avoid, to a certain extent, the first limiting portion 251 from being riveted and causing the side of the insulating member 400 to be squeezed and cracked due to interference with the riveting.

[0083] In some embodiments, the thickness of the first limiting portion 251 ranges from 0.5 mm to 1.5 mm. The thickness of the first limiting portion 251 mentioned here can be understood as H1 shown in FIG4 . When the thickness of the first limiting portion 251 is thin, the structural strength of the first limiting portion 251 is reduced, thereby reducing the fit strength between the pole 250 and the buffer 500. When the thickness of the first limiting portion 251 is thick, the difficulty of forming the first limiting portion 251 during the riveting process of the pole 250 is increased, and the sealing gap between the riveting forming of the first limiting portion 251 and the buffer 500 is larger, affecting the fit between the pole 250 and the buffer 500.

[0084] Therefore, the present application sets the thickness of the first limiting portion 251 to be within the range of 0.5 mm to 1.5 mm. This ensures the structural strength of the first limiting portion 251 while reducing the difficulty of forming the first limiting portion 251 and ensuring the sealing effect of the riveted forming of the first limiting portion 251 and the buffer 500, thereby ensuring the effective fit between the terminal 250 and the buffer 500.

[0085] In some embodiments, the thickness of the first limiting portion 251 ranges from 0.5 mm to 0.9 mm.

[0086] In a specific example, the thickness of the first limiting portion 251 is 0.5 mm, 0.7 mm, 0.9 mm, 1 mm, 1.2 mm, or 1.5 mm.

[0087] In some embodiments, the thickness of at least a portion of the buffer member 500 located outside the first limiting portion 251 is greater than the thickness of the first limiting portion 251. The thickness of at least a portion of the buffer member 500 located outside the first limiting portion 251 mentioned here can be understood as H2 shown in FIG.

[0088] That is, as shown in FIG4 , H2>H1. When H2≤H1, there is a risk that the welding penetration of the pole 250 and the buffer 500 may burn the insulating member 400 to a certain extent, thereby reducing the working performance of the insulating member 400.

[0089] Therefore, by setting the thickness of at least part of the buffer member 500 located on the periphery of the first limiting portion 251 to be greater than the thickness of the first limiting portion 251, the welding penetration of the pole 250 and the buffer member 500 during the welding process can be avoided to a certain extent to avoid burning the insulating member 400, thereby extending the service life of the insulating member 400 and ensuring the working performance of the insulating member 400.

[0090] The weld penetration refers to the depth of the welded material melted on the cross section of the weld joint between the electrode 250 and the buffer 500 .

[0091] In some embodiments, the width of at least a portion of the buffer 500 located on the periphery of the first limiting portion 251 ranges from 1 mm to 3 mm. The width of at least a portion of the buffer 500 located on the periphery of the first limiting portion 251 mentioned herein can be understood as H3 shown in FIG4 . When the width of at least a portion of the first limiting portion 251 is narrow, there is a risk of scalding the insulating member 400 located on the periphery of the buffer 500 during welding of the pole 250 and the buffer 500, thereby reducing the working performance of the insulating member 400 and the structural strength of the buffer 500. When the width of at least a portion of the first limiting portion 251 is wide, the manufacturing cost of the buffer 500 is increased, and the buffer 500 occupies a larger space, thereby reducing space utilization.

[0092] Therefore, the present application sets the width of at least part of the buffer 500 located on the periphery of the first limiting portion 251 to a value range of 1mm-3mm. In this way, during the welding process of the pole 250 and the buffer 500, burns to the insulating part 400 located on the periphery of the buffer 500 can be avoided to a certain extent, thereby ensuring the working performance of the insulating part 400. At the same time, the structural strength of the buffer 500 can be ensured, the manufacturing cost of the buffer 500 can be reduced, and the space occupied by the buffer 500 can be reduced, thereby improving space utilization.

[0093] In some embodiments, the width of at least a portion of the buffer member 500 located at the periphery of the first limiting portion 251 is in the range of 1.5 mm to 2 mm.

[0094] In a specific example, the width of at least a portion of the buffer member 500 located at the periphery of the first limiting portion 251 is 1 mm, 1.5 mm, 2 mm, 2.5 mm, or 3 mm.

[0095] In some embodiments, as shown in Figures 3 and 4 , the outer surface of the first limiting portion 251 is flush with the outer surface of the buffer 500 located on the outer periphery of the first limiting portion 251. This allows the outer surface of the first limiting portion 251 and the outer surface of the buffer 500 located on the outer periphery of the first limiting portion 251 to be on the same plane, thereby reducing the connection strength between the terminal 250 and the buffer 500 and ensuring the connection quality.

[0096] In some embodiments, the width of the receiving groove 510 ranges from 0.2 mm to 2 mm. The width of the receiving groove 510 mentioned here can be understood as H4 shown in FIG. 4 . When the width of the receiving groove 510 is too narrow, the connection strength between the pole 250 and the buffer 500 is reduced, while the difficulty of forming the receiving groove 510 is increased, and the flatness of the receiving groove 510 cannot be effectively guaranteed. Because the receiving groove 510 is generally formed during the riveting process between the pole 250 and the buffer 500, when the width of the receiving groove 510 is too wide, the buffer 500 is likely to crack after the riveting process between the pole 250 and the buffer 500, thereby affecting the working performance of the buffer 500.

[0097] Therefore, the present application sets the width range of the accommodating groove 510 to 0.2mm-2mm. This ensures the connection strength between the pole 250 and the buffer 500 while reducing the difficulty of forming the accommodating groove 510, and to a certain extent avoids the cracking of the buffer 500 after the accommodating groove 510 is formed. It is also beneficial to ensure the flatness of the accommodating groove 510, thereby ensuring the connection strength between the pole 250 and the buffer 500.

[0098] In a specific example, the width of the receiving groove 510 is 0.2 mm, 0.5 mm, 1 mm, 1.5 mm, or 2 mm.

[0099] In some embodiments, the distance between the bottom wall of the receiving groove 510 and the bottom wall of the buffer 500 ranges from 0.4 mm to 2.5 mm. The distance between the bottom wall of the receiving groove 510 and the bottom wall of the buffer 500 mentioned here can be understood as H5 shown in FIG4 . When the distance between the bottom wall of the receiving groove 510 and the bottom wall of the buffer 500 is small, the structural strength of the buffer 500 is reduced, and there is a risk that the buffer 500 is deformed and crushes the insulating member 400 during the riveting process between the pole 250 and the buffer 500. When the distance between the bottom wall of the receiving groove 510 and the bottom wall of the buffer 500 is large, the manufacturing cost of the buffer 500 is increased, and the buffer 500 occupies a large space, thereby reducing space utilization.

[0100] Therefore, the present application sets the distance between the bottom wall of the accommodating groove 510 and the bottom wall of the buffer 500 to 0.4mm-2.5mm. In this way, while ensuring the structural strength of the buffer 500, it can also reduce the manufacturing cost of the buffer 500, reduce the space occupied by the buffer 500, and improve space utilization.

[0101] In some embodiments, the distance between the bottom wall of the receiving groove 510 and the bottom wall of the buffer member 500 ranges from 0.8 mm to 1.2 mm.

[0102] In a specific example, the distance between the bottom wall of the receiving groove 510 and the bottom wall of the buffer 500 is 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, 1.2 mm, 1.5 mm, 2 mm, or 2.5 mm.

[0103] In some embodiments, as shown in FIG2 and FIG3 , the pole 250 is a hollow member to define a liquid injection channel 211 , the liquid injection channel 211 is provided with an inlet 2111 and an outlet 2112 , and at least one of the inlet 2111 and the outlet 2112 is provided with a blocking member 600 for closing the same. That is to say, an injection channel 211 having an inlet 2111 and an outlet 2112 is formed in the pole 250, and at least one of the inlet 2111 and the outlet 2112 is provided with a sealing member 600. By providing the injection channel 211, it is convenient to inject liquid toward the pole core 320 through the injection channel 211, thereby ensuring the working performance of the pole core 320. At the same time, by providing the sealing member 600 on at least one of the inlet 2111 and the outlet 2112, the injection channel 211 can be blocked by the sealing member 600. On the one hand, it is possible to prevent external foreign matter from entering the battery cell 1000 through the injection channel 211 to a certain extent. On the other hand, it is also possible to prevent the electrolyte in the battery cell 1000 from overflowing through the injection channel 211 to a certain extent, thereby ensuring the working performance of the battery cell 1000.

[0104] At the same time, by setting the pole 250 as a hollow part to define the injection channel 211, it is also possible to avoid opening the injection channel 211 on the cover body 210, thereby reducing the difficulty of forming the injection channel 211. Moreover, when the pole core 320 is formed into a cylinder, by setting the injection channel 211 on the pole 250, it is also beneficial to set the injection channel 211 directly opposite the winding hole of the pole core 320, thereby ensuring the injection effect.

[0105] In some embodiments, as shown in FIG3 , both the inlet 2111 and the outlet 2112 are provided with a blocking member 600 . The blocking member 600 blocks the injection channel 211 , thereby preventing foreign matter from entering the battery cell 1000 through the injection channel 211 to a certain extent. Furthermore, the blocking member 600 can also prevent the electrolyte in the battery cell 1000 from overflowing through the injection channel 211 to a certain extent, thereby ensuring the operating performance of the battery cell 1000 .

[0106] In a specific example, after the injection of liquid through the injection channel 211 is completed, the blocking member 600 is used to block the inlet 2111 and the outlet 2112 of the injection channel 211 .

[0107] In some embodiments, in combination with Figures 1, 3 and 7, the sealing member 600 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 through the injection channel 211 is completed, the sealing pin 220 is first used to seal the outlet 2112 of the injection channel 211, and then the sealing cover 230 is laser welded to the inlet 2111 of the injection channel 211 to achieve sealing and blocking of the injection channel 211 by the sealing member 600.

[0108] At the same time, by using the sealing nail 220 to block the outlet 2112 of the liquid injection channel 211, it is also possible to avoid, to a certain extent, the welding slag from falling into the pole core 320 during the welding process of the sealing cover 230, thereby avoiding, to a certain extent, the risk of causing a short circuit in the pole core 320.

[0109] In some embodiments, the buffer 500 and the insulating member 400 cooperate to limit the movement of the buffer 500 in the radial direction of the pole 250. In other words, the cooperation between the buffer 500 and the insulating member 400 can, to a certain extent, prevent the buffer 500 from moving in the radial direction of the pole 250, thereby ensuring the positional stability of the buffer 500. This ensures that the first limiting portion 251 can accurately act on the buffer 500 during the molding process of the pole 250, thereby maintaining the structural strength of the first limiting portion 251 after molding and, to a certain extent, preventing the first limiting portion 251 from directly pressing on the insulating member 400 and causing damage to the insulating member 400.

[0110] In some embodiments, as shown in FIG3 , the insulating member 400 is provided with an annular first protrusion 410, which is disposed around the outer peripheral wall of the buffer member 500. This allows the insulating member 400 to limit the position of the buffer member 500, thereby preventing the buffer member 500 from being displaced in the radial direction of the pole 250 to a certain extent, thereby achieving a position-limiting fit between the buffer member 500 and the insulating member 400.

[0111] In addition, the above arrangement can also realize a wrapping design for the buffer member 500 on the insulating member 400 , thereby avoiding the risk of high-voltage breakdown to a certain extent.

[0112] In some embodiments, in combination with Figures 3 and 6, the insulating member 400 is provided with a second protrusion 420 protruding toward the buffer member 500, and the insulating member 400 is provided with a stop surface 421 located on the inner side of the second protrusion 420 facing the installation opening 212; the buffer member 500 is provided with a mating groove 520, the second protrusion 420 is mated with the mating groove 520, and a portion of the buffer member 500 is mated with the stop surface 421. That is to say, the insulating part 400 is not only provided with a first annular protrusion 410, but also provided with a second protrusion 420 protruding toward the buffer part 500, and a stop surface 421 is formed on the inner side of the second protrusion 420 facing the mounting opening 212. The mating groove 520 on the buffer part 500 is mated with the second protrusion 420, and a part of the buffer part 500 is mated with the stop surface 421, thereby realizing the limited mating of the insulating part 400 and the buffer part 500, further improving the position stability of the buffer part 500, and avoiding displacement of the buffer part 500 to a certain extent, thereby ensuring the relative position stability of the insulating part 400 and the buffer part 500.

[0113] In some embodiments, as shown in FIG6 , the mating grooves 520 are spaced apart on opposite sides of the buffer member 500 . In this way, when the mating grooves 520 are limitedly engaged with the second protrusions 420 , the buffer member 500 can be prevented from rotating relative to the insulating member 400 to a certain extent, thereby preventing the pole 250 from rotating during the movement of the cover assembly 200 , thereby providing torsional strength for the pole 250 .

[0114] That is to say, by providing a second protrusion 420 on the insulating member 400 that protrudes toward the buffer member 500 and providing a mating groove 520 on the buffer member 500, the second protrusion 420 cooperates with the mating groove 520, which not only stabilizes the relative position of the insulating member 400 and the buffer member 500, but also provides torsional strength for the pole 250, thereby improving the position stability of the pole 250.

[0115] In some embodiments, the depth of the mating groove 520 ranges from 0.3 mm to 1 mm. The depth of the mating groove 520 mentioned here can be understood as H6 shown in FIG4 . A smaller depth of the mating groove 520 will affect the ability of the buffer 500 to provide torsional strength to the pole 250 . A larger depth of the mating groove 520 will reduce the structural strength of the buffer 500 and require a corresponding increase in the height of the second protrusion 420 , increasing manufacturing costs.

[0116] Therefore, the present application sets the depth of the matching groove 520 to be within the range of 0.3 mm to 1 mm. This improves the performance of the buffer 500 in providing torsional strength to the pole 250 while ensuring the structural strength of the buffer 500 and reducing the manufacturing cost of the second protrusion 420.

[0117] In some embodiments, the depth of the mating groove 520 ranges from 0.5 mm to 0.8 mm.

[0118] In a specific example, the recessed depth of the matching groove 520 is 0.3 mm, 0.5 mm, 0.8 mm, or 1 mm.

[0119] In some embodiments, as shown in Figures 4, 5, and 6, the mating groove 520 and the receiving groove 510 are spaced apart in the thickness direction of the buffer 500. The thickness direction of the buffer 500 mentioned here can be understood as the up-down direction shown in Figure 2. This improves the structural strength of the buffer 500 and, to a certain extent, prevents the welding penetration of the pole 250 and the buffer 500 from burning the insulating member 400, thereby extending the service life of the insulating member 400 and ensuring the working performance of the insulating member 400.

[0120] In some embodiments, the minimum spacing between the mating groove 520 and the receiving groove 510 in the radial direction of the buffer 500 is 0.35 mm to 1.5 mm. The radial direction of the buffer 500 referred to herein can be understood as the X-direction shown in FIG. 4 . The above description means that in the X-direction, there are multiple distances between the mating groove 520 and the receiving groove 510, and the minimum spacing between the mating groove 520 and the receiving groove 510 is defined as the shortest distance between the mating groove 520 and the receiving groove 510 in the X-direction.

[0121] Therefore, the above-mentioned minimum spacing between the mating groove 520 and the accommodating groove 510 can also be understood as H7 shown in Figure 4. When the minimum spacing between the mating groove 520 and the accommodating groove 510 is small, not only will the structural strength of the buffer 500 be reduced, but the welding penetration during the welding process of the pole 250 and the buffer 500 will also pose a risk of scalding the insulating part 400, affecting the working performance of the insulating part 400; when the minimum spacing between the mating groove 520 and the accommodating groove 510 is large, under the premise that the radial size of the buffer 500 is certain, the working performance of the mating groove 520 and / or the accommodating groove 510 will be reduced.

[0122] In summary, the present application sets the minimum spacing between the mating groove 520 and the accommodating groove 510 to 0.35mm-1.5mm. In this way, while improving the structural strength of the buffer 500, it can also avoid the welding penetration of the pole 250 and the buffer 500 during the welding process to a certain extent and burn the insulating part 400, thereby extending the service life of the insulating part 400 and ensuring the working performance of the insulating part 400. At the same time, it can also ensure the mating effect of the mating groove 520 and the second protrusion 420 and the mating effect of the accommodating groove 510 and the first limiting portion 251, thereby ensuring the isolation effect of the buffer 500.

[0123] In some embodiments, in the radial direction of the buffer 500 , the minimum distance between the matching groove 520 and the receiving groove 510 is 0.5 mm-0.7 mm.

[0124] In a specific example, in the radial direction of the buffer 500 , the minimum distance between the matching groove 520 and the receiving groove 510 is 0.35 mm, 0.5 mm, 0.7 mm, 1 mm, 1.2 mm, or 1.5 mm.

[0125] In some embodiments, in the axial direction of the buffer 500, the depth of the mating groove 520 is less than the distance between the bottom wall of the receiving groove 510 and the bottom wall of the buffer 500. The axial direction of the buffer 500 mentioned here can be understood as the up-down direction shown in FIG. This arrangement effectively allows the mating groove 520 and the receiving groove 510 to be spaced apart in the thickness direction of the buffer 500, thereby further improving the structural strength of the buffer 500 and, to a certain extent, preventing the insulating member 400 from being burned by the welding penetration of the terminal 250 and the buffer 500 during the welding process, thereby extending the service life of the insulating member 400.

[0126] In summary, in the radial direction of the buffer component 500 and in the axial direction of the buffer component 500 , the matching groove 520 and the accommodating groove 510 are arranged at intervals.

[0127] The battery cell 1000 according to an embodiment of the present application will be described below with reference to the accompanying drawings.

[0128] As shown in FIG. 7 , a battery cell 1000 according to an embodiment of the present application includes: a housing 300 , a cap assembly 200 , and a pole core 320 .

[0129] As shown in FIG. 7 , the cover assembly 200 is disposed at the end of the housing 300 . The cover assembly 200 is the aforementioned cover assembly 200 , and the specific structure of the cover assembly 200 is not described herein.

[0130] As shown in Figures 3 and 7 , the pole core 320 is disposed within the housing 300 and is provided with a first connecting tab 321. The first connecting tab 321 is electrically connected to the pole post 250. This allows for electrical connection between the pole post 250 and the pole core 320, facilitating current extraction from the pole core 320 using the pole post 250 and ensuring the operating performance of the pole core 320.

[0131] At the same time, by arranging the pole core 320 in the shell 300, the shell 300 can be used to protect the pole core 320, thereby extending the service life of the pole core 320 and improving the safety of the pole core 320.

[0132] 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 ensure the working performance of the battery cell 1000.

[0133] In some embodiments, the housing 300 is formed by stamping or welding, and the material of the housing 300 is aluminum or steel.

[0134] The outer shell 300 and the cover body 210 may be two separate parts connected by welding, or the outer shell 300 and the cover body 210 may be an integral part formed by stamping.

[0135] In some embodiments, as shown in FIG7 , the battery cell 1000 further includes a current collecting plate 100 disposed between the first connecting tab 321 and the cover plate assembly 200 . The current collecting plate 100 is electrically connected to the first connecting tab 321 and the electrode post 250 , respectively. This allows for electrical connection between the electrode core 320 and the electrode post 250 , allowing current to be drawn from the electrode core 320 via the electrode post 250 , thereby ensuring the operating performance of the electrode core 320 and, in turn, the operating performance of the battery cell 1000 .

[0136] In some embodiments, the collecting plate 100 is respectively penetrated and welded to the first connecting pole ear 321 and the pole post 250. In this way, while the pole core 320 and the pole post 250 can be electrically connected, the connection strength between the collecting plate 100 and the first connecting pole ear 321 and the pole post 250 can be ensured, and the connection difficulty between the collecting plate 100 and the first connecting pole ear 321 and the pole post 250 can be reduced, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0137] In some embodiments, as shown in conjunction with FIG7 and FIG8 , the current collecting plate 100 includes a plate body 140, at least a portion of which protrudes toward the pole core 320 to form a first connecting portion 110 protruding toward the cover plate assembly 200 and a second connecting portion 120 protruding toward the pole core 320. The first connecting portion 110 is electrically connected to the pole post 250, and the second connecting portion 120 is electrically connected to the first connecting tab 321. This achieves electrical connection between the pole post 250 and the pole core 320, reduces the difficulty of connecting the pole post 250 and the pole core 320, and ensures the quality of the connection between the pole post 250 and the pole core 320.

[0138] In some embodiments, the collecting plate 100 is formed by stamping to form a first connecting portion 110 protruding toward the cover plate assembly 200 and a second connecting portion 120 protruding toward the pole core 320 on the collecting plate 100, thereby reducing the difficulty of forming the collecting plate 100.

[0139] At the same time, by configuring the collecting plate 100 to include a plate body 140, the collecting plate 100 can also be formed into a single-layer structure, thereby reducing the space occupied by the collecting plate 100, improving the space utilization of the battery cell 1000, shortening the flow path of the current, reducing impedance and heat generation, ensuring the working performance of the battery cell 1000, and improving the safety of the battery cell 1000.

[0140] In some embodiments, the thickness of the first connecting portion 110 is greater than the thickness of the second connecting portion 120. The thicker first connecting portion 110 makes the main body of the current collecting plate 100 thicker, which facilitates forming the first connecting portion 110 and the second connecting portion 120 directly on the current collecting plate 100, thereby preventing the current collecting plate 100 from breaking during the molding process. Furthermore, the welding of the first connecting portion 110 to the pole 250 can also prevent the pole core 320 from being affected, thereby extending the service life of the pole core 320.

[0141] At the same time, by setting the thickness of the first connecting part 110 to be greater than the thickness of the second connecting part 120, it is also beneficial to set the thickness of the second connecting part 120 to be thinner, which facilitates the welding of the second connecting part 120 and the pole core 320 and increases the welding yield.

[0142] Optionally, as shown in FIG8 , the thickness L1 of the second connection portion 120 is 0.1 mm to 0.8 mm. When the thickness of the second connection portion 120 is less than 0.1 mm, the structural strength of the second connection portion 120 is reduced, making the current collecting plate 100 susceptible to breakage and shortening the service life of the current collecting plate 100. When the thickness of the second connection portion 120 is greater than 0.8 mm, welding the second connection portion 120 to the pole core 320 becomes more difficult.

[0143] Therefore, the present application sets the thickness L1 of the second connection portion 120 to 0.1 mm to 0.8 mm, which can prevent the current collecting plate 100 from breaking to a certain extent, and can also facilitate welding of the second connection portion 120 and the pole core 320, thereby increasing the welding yield.

[0144] In a specific example, the thickness of the second 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.

[0145] Optionally, as shown in FIG8 , the thickness of the first connecting portion 110 is L2, where 0 mm < L2 - L1 ≤ 0.5 mm. That is, the thickness of the first connecting portion 110 is greater than the thickness of the second connecting portion 120, and the difference in thickness between the first connecting portion 110 and the second connecting portion 120 is less than 0.5 mm. This can, to a certain extent, prevent the second 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 second connecting portion 120. This reduces the difficulty of molding the current collecting disc 100, while also reducing its weight and production cost.

[0146] In a specific example, the thickness of the second connection portion 120 is 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, or 0.5 mm.

[0147] In some embodiments, as shown in Figures 9 and 10, the collecting plate 100 includes a first connecting portion 110, an intermediate portion 130 and a second connecting portion 120. The first connecting portion 110, the intermediate portion 130 and the second connecting portion 120 are stacked in the axial direction of the pole core 320. The first connecting portion 110 is electrically connected to the pole 250, and the second connecting portion 120 is electrically connected to the first connecting pole ear 321. That is to say, the current collecting disk 100 is not limited to being formed to include a disk body 140, and the first connecting portion 110 and the second connecting portion 120 are directly formed on the disk body 140. The current collecting disk 100 can also be formed to include a first connecting portion 110, an intermediate portion 130, and a second connecting portion 120, wherein the axial direction of the pole core 320 mentioned here can also be understood as the up and down direction shown in Figure 7. By arranging the first connecting portion 110, the intermediate portion 130, and the second connecting portion 120 to be stacked in the axial direction of the pole core 320, it is convenient to use the current collecting disk 100 to connect two structural members (such as the pole 250 and the pole core 320) arranged in the up and down directions, reducing the difficulty of connecting the pole 250 and the pole core 320 spaced apart in the up and down directions, thereby realizing electrical connection between the pole core 320 and the pole 250, so as to facilitate using the pole 250 to lead the current of the pole core 320, thereby ensuring the working performance of the pole core 320, that is, ensuring the working performance of the battery cell 1000.

[0148] At the same time, by arranging the first connecting part 110, the middle part 130 and the second connecting part 120 to be stacked in the axial direction of the pole core 320, 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.

[0149] In some embodiments, during the processing of the collecting disc 100, the collecting disc 100 is first formed into the shape of Figure 9. After the processing of the collecting disc 100 is completed, the collecting disc 100 is folded (as shown in Figure 10), so that the first connecting portion 110, the middle portion 130 and the second connecting portion 120 of the collecting disc 100 are stacked axially with the pole core 320, which facilitates the use of the collecting disc 100 to achieve electrical connection between the pole 250 and the pole core 320, reduces the difficulty of connecting the pole 250 and the pole core 320, reduces the space occupied by the collecting disc 100, and reduces the difficulty of forming the collecting disc 100.

[0150] In some embodiments, as shown in Figures 7 and 9, the battery cell 1000 also includes a negative electrode cover 260, and the negative electrode cover 260 and the cover body 210 are arranged on opposite sides of the pole core 320. The pole core 320 also includes a second connecting electrode ear. The electrical connection between the negative electrode cover 260 and the second connecting electrode ear facilitates the use of the negative electrode cover 260 to draw out the current of the pole core 320 to ensure the working performance of the pole core 320.

[0151] Optionally, one of the first connecting tab 321 and the second connecting tab is a positive tab of the electrode core 320 , and the other is a negative tab of the electrode core 320 .

[0152] Optionally, in combination with Figures 7 and 9, the current collecting plate 100 formed as a plate body 140 is arranged on the cover plate assembly 200, and the current collecting plate 100 including the first connecting portion 110, the middle portion 130 and the second connecting portion 120 is arranged on the negative electrode cover plate 260, so that the battery cell 1000 adopts a single-layer and double-layer current collecting plate design, which is beneficial to reducing impedance and improving the space utilization and process feasibility of the battery cell 1000.

[0153] In some embodiments, the current collecting disc 100 formed into a disc body 140 is a positive current collecting disc, and the current collecting disc 100 including the first connecting portion 110, the middle portion 130 and the second connecting portion 120 is a negative current collecting disc, wherein the positive current collecting disc is made of aluminum and the negative current collecting disc is made of copper.

[0154] 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.

[0155] In some embodiments, as shown in Figures 9 and 10 , when the current collecting tray 100 includes a first connecting portion 110, a middle portion 130, and a second connecting portion 120, the second connecting portion 120 further includes an identification area 122, which is disposed near the connection between the middle portion 130 and the second connecting portion 120. In other words, the identification area 122 is disposed near the connection between the middle portion 130 and the second connecting portion 120. The identification area 122 helps a worker quickly locate the connection between the middle portion 130 and the second connecting portion 120, thereby facilitating folding the current collecting tray 100 from the shape shown in Figure 9 to the shape shown in Figure 10 , reducing the molding difficulty of the current collecting tray 100 and ensuring the structural accuracy of the molded current collecting tray 100. This avoids reducing the area of ​​the second connecting portion 120 to a certain extent, thereby ensuring the connection area between the current collecting tray 100 and the electrode core 320, and improving the operating performance of the battery cell 1000.

[0156] That is, by providing the identification area 122 , the present application can reduce the difficulty of forming the collecting disc 100 while limiting the folding position of the collecting disc 100 to ensure the connection area between the second connecting portion 120 and the pole core 320 .

[0157] In some embodiments, as shown in FIG10 , the line connecting the opposite sidewalls of the middle portion 130 and the connection point of the second connecting portion 120 is a 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 second 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 FIG10 .

[0158] It should be noted that when the minimum distance between the identification area 122 and the first connecting line T1 is less than -2 mm, the area of ​​the second connecting portion 120 will be reduced, thereby reducing the connection area between the second connecting portion 120 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 portion 130 will be reduced, reducing the structural strength of the middle portion 130, and also causing the first connecting portion 110, the middle portion 130 and the second connecting portion 120 to be unable to be stacked in the axial direction of the pole core 320, affecting the performance of the collecting plate 100.

[0159] 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 second connecting part 120 and the pole core 320, and at the same time ensuring the area of ​​the middle part 130, so that the first connecting part 110, the middle part 130 and the second connecting part 120 can be effectively stacked in the axial direction of the pole core 320, thereby ensuring the performance of the collecting plate 100.

[0160] 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.

[0161] Optionally, as shown in FIG9 , 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 identification area 122 from reducing the structural strength of the collector tray 100 to a certain extent, while also ensuring that the identification area 122 has a certain width. This facilitates the use of the identification area 122 to limit the folding position of the collector tray 100, thereby reducing the difficulty of forming the collector tray 100.

[0162] 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.

[0163] In some embodiments, as shown in conjunction with Figures 9 and 10 , the identification area 122 is a through hole extending through the second connecting portion 120 or a groove provided in the second connecting portion 120. In other words, the identification area 122 can be formed as a through hole extending through the second connecting portion 120 or as a groove provided in the second 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.

[0164] 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.

[0165] In some embodiments, as shown in FIG7 , 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 .

[0166] As shown in FIG11 , the battery assembly 10 according to an embodiment of the present application is described below.

[0167] A battery assembly 10 according to an embodiment of the present application includes: a plurality of battery cells 1000 .

[0168] 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.

[0169] 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 .

[0170] It should be noted that the battery assembly 10 here can be a battery pack or a battery module, etc.

[0171] As shown in FIG12 , the electric device 1 according to an embodiment of the present application is described below.

[0172] An electrical device 1 according to an embodiment of the present application includes: a battery assembly 10.

[0173] 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.

[0174] 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 .

[0175] 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.

[0176] 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.

[0177] In the description of this application, it should be noted that, unless otherwise specified or limited, the terms "installation" and "connection" should be understood broadly. For example, they can refer to fixed connection, detachable connection, or integral connection; they can refer to mechanical connection or electrical connection. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0178] The specific structures of the cover plate assembly 200 of the battery cell 1000 according to the embodiment of the present application, the battery cell 1000, the battery assembly 10 and other components of the electrical device 1, such as the pole core 320, are well known to ordinary technicians in this field and will not be described in detail here.

[0179] 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.

[0180] 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 cover plate assembly (200) of a battery cell (1000), wherein: include: A cover plate body (210), wherein the cover plate body (210) is provided with a mounting opening (212); A pole (250), the pole (250) being passed through the mounting opening (212); an insulating member (400), the insulating member (400) being arranged in the mounting opening (212) and being located between the pole (250) and the cover body (210) so as to insulate the cover body (210) and the pole (250); the pole (250) having a first limiting portion (251) located on one side of the cover body (210); the first limiting portion (251) being used to limit and fix the pole (250) and the insulating member (400) to the cover body (210); A buffer member (500) is provided between the insulating member (400) and the first limiting portion (251).

2. The cover plate assembly (200) of the battery cell (1000) according to claim 1, wherein: The buffer member (500) is provided with a receiving groove (510), and at least a portion of the first limiting portion (251) is provided in the receiving groove (510), so that at least a portion of the buffer member (500) is located on the periphery of the first limiting portion (251).

3. The cover plate assembly (200) of the battery cell (1000) according to claim 1 or 2, wherein: The thickness H1 of the first limiting portion (251) has a value range of 0.5 mm to 1.5 mm.

4. The cover plate assembly (200) of the battery cell (1000) according to claim 3, wherein: The thickness H2 of at least a portion of the buffer member (500) located on the periphery of the first limiting portion (251) is greater than the thickness H1 of the first limiting portion (251); And / or, the width H3 of at least a portion of the buffer member (500) located on the periphery of the first limiting portion (251) is in the range of 1 mm to 3 mm.

5. The cover plate assembly (200) of the battery cell (1000) according to any one of claims 2 to 4, wherein: The outer surface of the first limiting portion (251) is flush with the outer surface of the buffer component (500) located at the periphery of the first limiting portion (251).

6. The cover plate assembly (200) of the battery cell (1000) according to any one of claims 2 to 5, wherein: The width H4 of the accommodating groove (510) ranges from 0.2 mm to 2 mm; And / or, the distance H5 between the bottom wall of the accommodating groove (510) and the bottom wall of the buffer member (500) is in the range of 0.4 mm to 2.5 mm.

7. The cover plate assembly (200) of the battery cell (1000) according to any one of claims 1 to 6, wherein: The pole (250) and the buffer (500) are connected by welding.

8. The cover plate assembly (200) of the battery cell (1000) according to any one of claims 1 to 7, wherein: The pole (250) is a hollow part to define a liquid injection channel (211); the liquid injection channel (211) is provided with an inlet (2111) and an outlet (2112); at least one of the inlet (2111) and the outlet (2112) is provided with a blocking member (600) for closing the inlet (2111) and the outlet (2112).

9. The cover plate assembly (200) of the battery cell (1000) according to claim 8, wherein: The inlet (2111) and the outlet (2112) are both provided with the blocking member (600).

10. The cover plate assembly (200) of the battery cell (1000) according to any one of claims 2 to 9, wherein: In the radial direction of the pole (250), the buffer member (500) and the insulating member (400) are positionally matched to limit the movement of the buffer member (500).

11. The cap plate assembly (200) of the battery cell (1000) according to claim 10, wherein: The insulating member (400) is provided with an annular first protrusion (410), and the first protrusion (410) is arranged around the outer peripheral wall of the buffer member (500).

12. The cap plate assembly (200) of the battery cell (1000) according to claim 10, wherein: The insulating member (400) is provided with a second protrusion (420) protruding toward the buffer member (500), and the insulating member (400) is provided with a stop surface (421) located on the inner side of the second protrusion (420) facing the installation opening (212); The buffer member (500) is provided with a matching groove (520), the second protrusion (420) matches with the matching groove (520), and a portion of the buffer member (500) is in abutment with the abutment surface (421).

13. The cap plate assembly (200) of the battery cell (1000) according to claim 12, wherein: The recess depth H6 of the matching groove (520) has a value range of 0.3 mm to 1 mm.

14. The cap plate assembly (200) of the battery cell (1000) according to claim 12, wherein: The matching groove (520) and the accommodating groove (510) are spaced apart in the thickness direction of the buffer (500).

15. The cap plate assembly (200) of the battery cell (1000) according to claim 14, wherein: In the radial direction of the buffer (500), the minimum distance H7 between the matching groove (520) and the accommodating groove (510) is 0.35 mm to 1.5 mm; And / or, in the axial direction of the buffer (500), the recessed depth of the matching groove (520) is smaller than the distance between the bottom wall of the accommodating groove (510) and the bottom wall of the buffer (500).

16. A battery cell (1000), wherein: include: Housing (300); a cover plate assembly (200), the cover plate assembly (200) being arranged at an end portion of the housing (300), the cover plate assembly (200) being the cover plate assembly (200) according to any one of claims 1 to 15; A pole core (320), the pole core (320) is arranged in the housing (300), the pole core (320) is provided with a first connecting pole lug (321), and the first connecting pole lug (321) is electrically connected to the pole column (250).

17. The battery cell (1000) according to claim 16, wherein: It also includes a current collecting plate (100), which is arranged between the first connecting pole lug (321) and the cover plate assembly (200), and the current collecting plate (100) is electrically connected to the first connecting pole lug (321) and the pole (250) respectively.

18. The battery cell (1000) according to claim 17, wherein: The collecting disk (100) includes a disk body (140), at least a portion of the disk body (140) protrudes toward the pole core (320) to form a first connecting portion (110) protruding toward the cover plate assembly (200) and a second connecting portion (120) protruding toward the pole core (320) on the disk body (140), the first connecting portion (110) being electrically connected to the pole (250), and the second connecting portion (120) being electrically connected to the first connecting pole lug (321).

19. The battery cell (1000) according to claim 18, wherein: The thickness of the first connecting portion (110) is greater than the thickness of the second connecting portion (120); And / or, the thickness of the second connection portion (120) is L1 = 0.1 mm to 0.8 mm, and the thickness of the first connection portion (110) is L2, wherein 0 mm < L2 - L1 ≤ 0.5 mm.

20. The battery cell (1000) according to any one of claims 17 to 19, wherein: The collecting plate (100) comprises a first connecting portion (110), an intermediate portion (130) and a second connecting portion (120), wherein the first connecting portion (110), the intermediate portion (130) and the second connecting portion (120) are stacked in the axial direction of the pole core (320), the first connecting portion (110) is electrically connected to the pole (250), and the second connecting portion (120) is electrically connected to the first connecting pole lug (321).

21. The battery cell (1000) according to any one of claims 16 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 16 to 21.

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

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