Cover plate assembly of battery monomer, battery monomer, battery assembly and electric device

Abstract

The utility model discloses a cover plate assembly of a battery monomer, the battery monomer, a battery assembly and an electric device, the cover plate assembly of the battery monomer comprises a cover plate body, a pole, an insulating piece and a buffer piece, the cover plate body is provided with an installation port, the pole penetrates through the installation port, and the buffer piece is arranged on the pole. The insulating part is arranged at the mounting port and located between the pole and the cover plate body to insulate and separate the cover plate body from the pole, the pole is provided with a first limiting part located on one side of the cover plate body, the first limiting part is used for limiting and fixing the pole, the insulating part and the cover plate body, and the buffering part is arranged between the insulating part and the first limiting part. According to the cover plate assembly of the single battery, the first limiting part can be prevented from directly extruding the insulating part in the forming process to a certain extent, and the extrusion force of the first limiting part on the insulating part is dispersed and buffered, so that the insulating part is prevented from being cracked by extrusion, the working performance of the insulating part is ensured, the first limiting part can be supported, and the service life of the insulating part is prolonged. And the structural strength of the formed first limiting part is improved.

Description

Technical Field

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

[0002] In the existing battery cell cover assembly, in order to achieve insulation matching between the pole and the cover body, an insulating member is usually provided between the pole and the cover body.

[0003] However, the existing poles are prone to damage the insulating parts during the molding process, which shortens the service life of the insulating parts and reduces the insulation performance of the insulating parts. 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 cover plate assembly for a battery cell, which can prevent the pole from damaging the insulating part during the molding process to a certain extent, and is conducive to fixing and supporting the pole, thus solving the technical problem that the pole is easy to damage the insulating part during the molding process in the prior art.

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

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

[0007] The fourth objective of the present utility model is to provide an electrical device having the above-mentioned battery assembly.

[0008] According to the embodiment of the utility model, 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.

[0009] According to the cover plate assembly of the battery cell of the embodiment of the utility model, a buffer is arranged between the insulating part and the first limiting part. In this way, during the molding process of the first limiting part, the buffer can be used to limit and support the first limiting part, thereby improving the structural strength of the first limiting part and ensuring the position stability of the first limiting part, thereby improving the position stability of the pole and ensuring the performance of the pole; at the same time, because the buffer is arranged between the insulating part and the first limiting part, it can also avoid the first limiting part directly squeezing the insulating part during the molding process to a certain extent, and the buffer can also be used to disperse and buffer the squeezing force applied to the insulating part by the first limiting part during the molding process, thereby avoiding the first limiting part to cause damage to the insulating part to a certain extent, extending the service life of the insulating part, and ensuring the insulation performance of the insulating part.

[0010] 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.

[0011] In some embodiments, the thickness H1 of the first limiting portion ranges from 0.5 mm to 1.5 mm.

[0012] 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.

[0013] In some embodiments, an outer surface of the first limiting portion is flush with an outer surface of the buffer component located at an outer periphery of the first limiting portion.

[0014] In some embodiments, the width H4 of the receiving groove is in the range of 0.2 mm to 2 mm; and / or the distance H5 between the bottom wall of the receiving groove and the bottom wall of the buffer is in the range of 0.4 mm to 2.5 mm.

[0015] In some embodiments, the pole and the buffer are connected by welding.

[0016] 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.

[0017] In some embodiments, both the inlet and the outlet are provided with the blocking member.

[0018] In some embodiments, in the radial direction of the pole, the buffer and the insulating member are limitedly matched to limit the movement and displacement of the buffer.

[0019] 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.

[0020] 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 port; the buffer member is provided with a mating groove, the second protrusion is mated with the mating groove, and a portion of the buffer member is mated with the stop surface.

[0021] In some embodiments, the recess depth H6 of the mating groove ranges from 0.3 mm to 1 mm.

[0022] In some embodiments, the mating groove and the accommodating groove are spaced apart in the thickness direction of the buffer.

[0023] 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.

[0024] According to the battery cell of the embodiment of the utility model, it includes: a shell; a cover plate assembly, which is arranged at the end of the shell, and the cover plate assembly is the aforementioned cover plate assembly; a pole core, which 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.

[0025] According to the battery cell of the embodiment of the utility model, the working performance of the battery cell can be guaranteed by adopting the aforementioned cover plate assembly.

[0026] 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 the current collecting plate is electrically connected to the first connecting tab and the pole, respectively.

[0027] In some embodiments, the current collecting plate includes a plate 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 plate 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.

[0028] 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.

[0029] In some embodiments, the collecting plate includes a first connecting portion, a middle portion, and a second connecting portion, wherein the first connecting portion, the middle portion, and the second connecting portion are stacked in the axial direction of 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.

[0030] In some embodiments, the battery cells are cylindrical batteries.

[0031] The battery assembly according to the embodiment of the present invention includes a plurality of the aforementioned battery cells.

[0032] According to the battery assembly of the embodiment of the utility model, the working performance of the battery assembly is ensured by adopting the aforementioned battery monomer.

[0033] The electric device according to the embodiment of the utility model includes the aforementioned battery assembly.

[0034] According to the electric device of the embodiment of the utility model, the aforementioned battery assembly is adopted to ensure the working performance of the electric device and improve the user experience.

[0035] 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

[0036] 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:

[0037] Figure 1 This is a schematic diagram of the cover assembly and the housing in some embodiments of the present invention.

[0038] Figure 2 It is an exploded view between the cover assembly and the housing in some embodiments of the present invention.

[0039] Figure 3 It is a cross-sectional view of a part of the structure of a battery cell according to some embodiments of the present invention.

[0040] Figure 4 for Figure 3 A partial enlarged view of area Ⅰ in the middle.

[0041] Figure 5 Schematic diagrams of buffer components according to some embodiments of the present invention.

[0042] Figure 6 It is a schematic diagram of the buffer member of some embodiments of the present invention from another angle.

[0043] Figure 7Exploded diagram of a battery cell according to some embodiments of the present invention.

[0044] Figure 8 Schematic diagram of current collecting plates according to some embodiments of the present invention.

[0045] Fig. 9 It is a schematic diagram of the current collecting disk and the negative electrode cover plate in other embodiments of the utility model, wherein the current collecting disk is in an unfolded state.

[0046] Fig.10 Schematic diagrams of current collecting plates of other embodiments of the present invention, wherein the current collecting plates are in the folding process.

[0047] Reference numerals:

[0048] 1000, battery cell;

[0049] 100. Collecting plate;

[0050] 110. a first connecting portion;

[0051] 120, second connecting portion; 122, identification area;

[0052] 130, middle part;

[0053] 140, plate body;

[0054] 200, cover plate assembly;

[0055] 210, cover body; 212, installation opening;

[0056] 250, pole;

[0057] 251, first limiting portion; 252, second limiting portion;

[0058] 211, liquid injection channel; 2111, inlet; 2112, outlet;

[0059] 260, negative electrode cover;

[0060] 270, top spacer;

[0061] 400, insulation parts;

[0062] 410, first protrusion;

[0063] 420, second protrusion; 421, stop surface;

[0064] 430, insulation sheet;

[0065] 440, sealing ring;

[0066] 500, buffer parts;

[0067] 510, receiving tank;

[0068] 520, matching groove;

[0069] 300, housing;

[0070] 320, pole core;

[0071] 600, blocking member; 220, sealing nail; 230, sealing cover;

[0072] 700, explosion-proof valve;

[0073] 800. Protective film. DETAILED DESCRIPTION

[0074] 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.

[0075] 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.

[0076] The cap plate assembly 200 of the battery cell 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0077] Combination Figure 1 , Figure 2 and Figure 3 As shown, the cap plate assembly 200 of the battery cell 1000 according to the embodiment of the present invention includes: a cap plate body 210 , a pole 250 , an insulating member 400 and a buffer member 500 .

[0078] Among them, Figure 2 As shown, a mounting opening 212 is provided on the cover body 210 .

[0079] Combination Figure 1 , Figure 2 and Figure 3As shown, the pole 250 is inserted into the mounting opening 212. It can also be understood that the pole 250 is disposed on the cover body 210 through the mounting opening 212, thereby reducing the difficulty of assembling the pole 250 and the cover body 210.

[0080] In some embodiments, the pole 250 is made of aluminum, and the aluminum is connected to the collector plate 100 (the specific structure of the collector plate 100 can be seen in Figure 7 ), 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 lead out the current of the pole core 320 to ensure the working performance of the pole core 320.

[0081] Combination Figure 2 and Figure 3 As shown, the insulating member 400 is provided at the mounting opening 212 and is located between the pole 250 and the cover body 210 to insulate the cover body 210 and the pole 250. The pole 250 has a first limiting portion 251 located on one side of the cover body 210. The first limiting portion 251 is used to limit and fix the pole 250 and the insulating member 400 to the cover body 210. Among them, by providing the insulating member 400 to achieve the insulation interval between the cover body 210 and the pole 250, the electrical connection between the cover body 210 and the pole 250 can be avoided to a certain extent, so as to ensure the working performance of the battery cell 1000.

[0082] At the same time, by providing a first limiting portion 251 located on one side of the cover body 210 on the pole 250, 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 between the pole 250 and the cover body 210 and the limiting cooperation between the insulating member 400 and the cover body 210 are achieved, so as to fix 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.

[0083] In some embodiments, Figure 3 As shown, 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 the opposite sides of the cover body 210, so as to realize fixing the pole 250 on the cover body 210, making it convenient to use the cover body 210 to support the pole 250, improve the position stability of the pole 250, and realize using the pole 250 to limit and fix the insulating member 400 on the cover body 210, and at the same time, it is also beneficial to use the pole 250 to lead out the current of the pole core 320.

[0084] 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.

[0085] 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 disposed on opposite sides of the cover body 210 .

[0086] In some embodiments, Figure 2 and Figure 3 As shown, 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 a 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 a 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 at 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.

[0087] In some embodiments, Figure 3 and Figure 5 As shown, 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 .

[0088] 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 avoid the electrolyte in the battery cell 1000 from overflowing to a certain extent.

[0089] like Figure 3 As shown, the buffer member 500 is disposed between the insulating member 400 and the first limiting portion 251 .

[0090] It should be noted that since the pole 250 is made through a pier forming process, during the forming process of the pole 250, it is necessary to bend part of the pole 250 toward the direction of the insulating part 400 to form the first limiting portion 251. However, since the structural strength of the insulating part 400 is relatively low, 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.

[0091] Therefore, the present application sets a buffer member 500 between the insulating member 400 and the first limiting portion 251, so that during the molding process of the first limiting portion 251, the buffer member 500 can be used to limit and support the first limiting portion 251, thereby improving the structural strength of the first limiting portion 251 after molding, and ensuring the position stability of the first limiting portion 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 portion 251 from directly squeezing the insulating member 400 during the molding process to a certain extent, and the buffer member 500 can also be used to disperse and buffer the squeezing force applied to the insulating member 400 by the first limiting portion 251 during the molding process, thereby avoiding the first limiting portion 251 from squeezing and cracking the insulating member 400 to a certain extent, extending the service life of the insulating member 400, and ensuring the insulation performance of the insulating member 400.

[0092] That is to say, by providing the buffer component 500, the present application can, to a certain extent, avoid the first limiting portion 251 from directly squeezing the insulating component 400 during the molding process while ensuring the structural strength of the first limiting portion 251 after molding. At the same time, the buffer component 500 can also be used to disperse and buffer the squeezing force applied by the first limiting portion 251 on the insulating component 400, thereby avoiding damage to the insulating component 400 to a certain extent, so as to ensure the insulation performance of the insulating component 400, thereby ensuring the working performance of the battery cell 1000.

[0093] It can be seen from the above structure that the cover plate assembly 200 of the battery cell 1000 of the embodiment of the utility model can ensure the structural strength of the first limiting portion 251 after molding by setting the buffer member 500 between the insulating member 400 and the first limiting portion 251, and at the same time, it is convenient to use the buffer member 500 to support the first limiting portion 251, thereby improving the position stability of the first limiting portion 251, and can also make the force of the first limiting portion 251 during the molding process applied to the buffer member 500, and use the buffer member 500 to disperse and buffer the extrusion force applied by the first limiting portion 251 on the insulating member 400. At the same time, it can also avoid the first limiting portion 251 directly squeezing the insulating member 400 during the molding process to cause damage to the insulating member 400 to a certain extent, so as to ensure the insulation performance of the insulating member 400, thereby ensuring the working performance of the battery cell 1000.

[0094] 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 portion 251 to ensure the structural strength of the first limiting portion 251 after molding, and to a certain extent avoid the first limiting portion 251 directly squeezing the insulating part 400 during the molding process to cause damage to the insulating part 400, and achieve the purpose of dispersing and buffering the extrusion force applied by the first limiting portion 251 on the insulating part 400, thereby ensuring the insulation performance of the insulating part 400.

[0095] In some embodiments, the buffer component 500 is stamped and formed from aluminum material, which reduces the difficulty of forming the buffer component 500 and also allows the buffer component 500 to have a certain structural strength, thereby facilitating the use of the buffer component 500 to provide limiting support for 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 component 400 during the forming process to cause damage to the insulating component 400, thereby extending the service life of the insulating component 400.

[0096] It should be noted that the aluminum material mentioned above can be 1 series aluminum or other series aluminum, and no specific limitation is made here.

[0097] In some embodiments, Figure 2 As shown, the cover assembly 200 also includes an explosion-proof valve 700, which is arranged on the cover body 210. The explosion-proof valve 700 is used to rupture when the internal pressure of the battery cell 1000 is relatively high, so as to discharge the pressure in the battery cell 1000, thereby improving the safety of the battery cell 1000.

[0098] In some embodiments, in combination Figure 1 and Figure 2 As shown, the cover plate assembly 200 further includes a protective sheet 800 , which is disposed on the outside of the explosion-proof valve 700 to protect the explosion-proof valve 700 and prevent external foreign matter from damaging the explosion-proof valve 700 to a certain extent, thereby ensuring the performance of the explosion-proof valve 700 .

[0099] In some embodiments, in combination Figure 2 and Figure 3 As shown, 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 a 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, avoid the pole core 320 from causing damage to the explosion-proof valve 700, thereby ensuring the performance of the explosion-proof valve 700.

[0100] In some embodiments, the pole 250 and the buffer 500 are connected by welding, so as to realize the fixed connection between the pole 250 and the buffer 500, and at the same time ensure the connection strength between the pole 250 and the buffer 500, so as to facilitate the use of the buffer 500 to support the pole 250, improve the position stability of the pole 250, and at the same time facilitate the use of the buffer 500 to ensure the structural strength of the pole 250 after forming.

[0101] The welding mentioned here may be laser welding.

[0102] In some embodiments, in combination Figure 3 , Figure 4 and Figure 5 As shown, the buffer 500 is provided with a receiving groove 510, and at least part of the first limiting portion 251 is provided in the receiving groove 510, so that at least part of the buffer 500 is located at the periphery of the first limiting portion 251. Here, it means that when at least part of the first limiting portion 251 is provided in the receiving groove 510, at least part of the buffer 500 can be provided at the periphery of the first limiting portion 251, so as to utilize the buffer 500 to isolate the pole 250, to a certain extent, avoid the pole 250 directly squeezing the insulating member 400 during the molding process and squeezing the insulating member 400 to crack, thereby to a certain extent avoiding the risk of leakage and poor insulation withstand voltage.

[0103] In some embodiments, the pole 250 is riveted to the buffer 500, and a receiving groove 510 is provided on the buffer 500. In this way, during the cooperation 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 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 member 400, and to a certain extent, avoiding the buffer 500 from directly squeezing the insulating member 400 to crack the insulating member 400, thereby to a certain extent avoiding the risk of leakage and poor insulation withstand voltage.

[0104] At the same time, due to the existence of the buffer member 500, it is also possible to avoid, to a certain extent, the first limiting portion 251 being riveted, and the side of the insulating member 400 being squeezed and cracked due to the interference fit during riveting.

[0105] In some embodiments, the thickness of the first limiting portion 251 ranges from 0.5 mm to 1.5 mm. Figure 4As shown in H1, when the thickness of the first limiting portion 251 is relatively thin, the structural strength of the first limiting portion 251 will be reduced, thereby reducing the matching strength between the pole 250 and the buffer 500; when the thickness of the first limiting portion 251 is relatively thick, the molding difficulty of the first limiting portion 251 will be increased during the riveting process of the pole 250, and at the same time, the sealing gap between the riveting molding of the first limiting portion 251 and the buffer 500 will be larger, affecting the matching effect of the pole 250 and the buffer 500.

[0106] Therefore, the present application sets the thickness of the first limiting portion 251 to be in the range of 0.5 mm to 1.5 mm. In this way, while ensuring the structural strength of the first limiting portion 251, the difficulty of forming the first limiting portion 251 can be reduced, and the sealing effect of the riveting forming of the first limiting portion 251 and the buffer 500 can be ensured, thereby ensuring the matching effect of the pole 250 and the buffer 500.

[0107] In some embodiments, the thickness of the first limiting portion 251 ranges from 0.5 mm to 0.9 mm.

[0108] 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, etc.

[0109] In some embodiments, the thickness of at least a portion of the buffer member 500 located at the periphery of 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 at the periphery of the first limiting portion 251 mentioned here can be understood as Figure 4 H2 shown in .

[0110] That is to say, Figure 4 As shown, 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.

[0111] Therefore, by setting the thickness of at least part of the buffer member 500 located at the periphery of the first limiting portion 251 to be greater than the thickness of the first limiting portion 251, it is possible to avoid, to a certain extent, the welding depth of the pole 250 and the buffer member 500 during the welding process 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.

[0112] The welding penetration refers to the melting depth of the welded material on the cross section of the weld joint between the pole 250 and the buffer 500 .

[0113] In some embodiments, the width of at least a portion of the buffer 500 located at the periphery of the first limiting portion 251 ranges from 1 mm to 3 mm. Figure 4 As shown in H3, when the width of at least part of the first limit portion 251 is narrow, there is a risk of scalding the insulating member 400 located at the periphery of the buffer member 500 during the welding process of the pole 250 and the buffer member 500, thereby reducing the working performance of the insulating member 400 and the structural strength of the buffer member 500; when the width of at least part of the first limit portion 251 is wide, the manufacturing cost of the buffer member 500 will be increased, and the buffer member 500 will occupy a larger space, thereby reducing the space utilization rate.

[0114] Therefore, the present application sets the width of at least part of the buffer 500 located at 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 component 400 located at the periphery of the buffer 500 can be avoided to a certain extent, thereby ensuring the working performance of the insulating component 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.

[0115] 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.

[0116] 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.

[0117] In some embodiments, in combination Figure 3 and Figure 4 As shown, the outer surface of the first limiting portion 251 is flush with the outer surface of the buffer 500 located at the outer periphery of the first limiting portion 251. In this way, the outer surface of the first limiting portion 251 and the outer surface of the buffer 500 located at the outer periphery of the first limiting portion 251 can be on the same plane, so as to reduce the connection strength between the pole 250 and the buffer 500 and ensure the connection quality.

[0118] In some embodiments, the width of the receiving groove 510 ranges from 0.2 mm to 2 mm. Figure 4As shown in H4, when the width of the receiving groove 510 is too narrow, the connection strength between the pole 250 and the buffer 500 will be reduced, and the difficulty of forming the receiving groove 510 will be 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 will easily crack after the riveting process between the pole 250 and the buffer 500, affecting the working performance of the buffer 500.

[0119] Therefore, the present application sets the width range of the receiving groove 510 to 0.2mm-2mm. This can ensure the connection strength between the pole 250 and the buffer 500 while reducing the difficulty of forming the receiving groove 510, and to a certain extent avoid the cracking of the buffer 500 after the receiving groove 510 is formed. It is also beneficial to ensure the flatness of the receiving groove 510, thereby ensuring the connection strength between the pole 250 and the buffer 500.

[0120] 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, etc.

[0121] 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. Figure 4 As shown in H5, when the distance between the bottom wall of the accommodating groove 510 and the bottom wall of the buffer 500 is small, the structural strength of the buffer 500 will be reduced, so that there is a risk of the buffer 500 being deformed and crushing 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 accommodating groove 510 and the bottom wall of the buffer 500 is large, the manufacturing cost of the buffer 500 will be increased, and at the same time, the buffer 500 will occupy a larger space, thereby reducing the space utilization rate.

[0122] 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. This can not only ensure the structural strength of the buffer 500, but also reduce the manufacturing cost of the buffer 500, reduce the space occupied by the buffer 500, and improve space utilization.

[0123] 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.

[0124] 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, etc.

[0125] In some embodiments, in combination Figure 2 and Figure 3 As shown, the pole 250 is a hollow member to define a liquid injection channel 211 , and 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 inlet 2111 and the outlet 2112 . 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, and on the other hand, it is 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.

[0126] 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, so as to reduce 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.

[0127] In some embodiments, Figure 3 As shown, both the inlet 2111 and the outlet 2112 are provided with a blocking piece 600. The blocking piece 600 is used to block the injection channel 211, thereby preventing foreign matter from entering the battery cell 1000 through the injection channel 211 to a certain extent, and also preventing 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.

[0128] In a specific example, after the injection 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 .

[0129] In some embodiments, in combination Figure 1 , Figure 3 and Figure 7As shown, 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 the sealing and blocking of the injection channel 211 by the sealing member 600.

[0130] At the same time, by using the sealing nail 220 to block the outlet 2112 of the injection channel 211, it is also possible to avoid, to a certain extent, 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 short circuiting the pole core 320.

[0131] In some embodiments, in the radial direction of the pole 250, the buffer 500 and the insulating member 400 are limited to cooperate to limit the movement displacement of the buffer 500. That is to say, the cooperation between the buffer 500 and the insulating member 400 can prevent the buffer 500 from being displaced in the radial direction of the pole 250 to a certain extent, thereby ensuring the position stability of the buffer 500, so that during the molding process of the pole 250, it can be ensured that the first limiting portion 251 can accurately act on the buffer 500, ensure the structural strength of the first limiting portion 251 after molding, and to a certain extent avoid the first limiting portion 251 directly squeezing the insulating member 400 to cause damage to the insulating member 400.

[0132] In some embodiments, Figure 3 As shown, 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. In order to facilitate the use of the insulating member 400 to limit the buffer member 500, to a certain extent, the buffer member 500 is prevented from being displaced in the radial direction of the pole 250, thereby achieving the limiting cooperation between the buffer member 500 and the insulating member 400.

[0133] In addition, the above arrangement can also realize a edging design for the buffer member 500 on the insulating member 400 , thereby avoiding the risk of high-voltage breakdown to a certain extent.

[0134] In some embodiments, in combination Figure 3 and Figure 6As shown, 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 part of the buffer member 500 is matched 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 installation 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 the 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.

[0135] In some embodiments, Figure 6 As shown, the mating grooves 520 are spaced apart on opposite sides of the buffer member 500, so that 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 to a certain extent, thereby achieving the purpose of providing torsional strength for the pole 250.

[0136] 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 can stabilize the relative position of the insulating member 400 and the buffer member 500 while providing torsional strength for the pole 250, thereby improving the position stability of the pole 250.

[0137] In some embodiments, the depth of the matching groove 520 ranges from 0.3 mm to 1 mm. Figure 4 As shown in H6, when the depression depth of the mating groove 520 is small, it will affect the performance of the buffer 500 in providing torsional strength for the pole 250; when the depression depth of the mating groove 520 is large, the structural strength of the buffer 500 will be reduced, and at the same time, the protrusion height of the second protrusion 420 needs to be increased accordingly, increasing the manufacturing cost.

[0138] 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 for the pole 250 while ensuring the structural strength of the buffer 500 and reducing the manufacturing cost of the second protrusion 420.

[0139] In some embodiments, the depth of the mating groove 520 ranges from 0.5 mm to 0.8 mm.

[0140] 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.

[0141] In some embodiments, in combination Figure 4 , Figure 5 and Figure 6 As shown, the matching groove 520 and the receiving groove 510 are arranged at intervals in the thickness direction of the buffer 500. The thickness direction of the buffer 500 mentioned here can be understood as Figure 2 The up and down directions shown in the figure can improve the structural strength of the buffer 500 and, to a certain extent, avoid the welding depth of the pole 250 and the buffer 500 during the welding process from scalding the insulating part 400, thereby extending the service life of the insulating part 400 and ensuring the working performance of the insulating part 400.

[0142] In some embodiments, in the radial direction of the buffer 500, the minimum spacing between the matching groove 520 and the receiving groove 510 is 0.35 mm-1.5 mm. Figure 4 The X direction shown in the above means that in the X direction, there are multiple distances between the mating groove 520 and the receiving groove 510, and the shortest distance between the mating groove 520 and the receiving groove 510 in the X direction is defined as the minimum spacing between the mating groove 520 and the receiving groove 510.

[0143] Therefore, the minimum distance between the matching groove 520 and the receiving groove 510 mentioned above can also be understood as Figure 4 As shown in H7, when the minimum spacing between the mating groove 520 and the receiving groove 510 is small, not only will the structural strength of the buffer 500 be reduced, but there will also be a risk of scalding the insulating part 400 due to the welding depth during the welding of the pole 250 and the buffer 500, thereby affecting the working performance of the insulating part 400; when the minimum spacing between the mating groove 520 and the receiving 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 receiving groove 510 will be reduced.

[0144] 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 depth of the pole 250 and the buffer 500 during the welding process from scalding the insulating part 400 to a certain extent, 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, as well as the mating effect of the accommodating groove 510 and the first limiting portion 251, thereby ensuring the isolation effect of the buffer 500.

[0145] In some embodiments, in the radial direction of the buffer 500 , the minimum spacing between the matching groove 520 and the receiving groove 510 is 0.5 mm-0.7 mm.

[0146] In a specific example, in the radial direction of the buffer 500 , the minimum spacing 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, etc.

[0147] In some embodiments, in the axial direction of the buffer 500, the recessed depth of the matching 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 Figure 2 As shown in the up and down directions, the above arrangement can effectively make the mating groove 520 and the accommodating groove 510 spaced apart in the thickness direction of the buffer 500, so as to further enhance the structural strength of the buffer 500, and at the same time avoid the welding depth of the pole 250 and the buffer 500 during the welding process from scalding the insulating part 400 to a certain extent, thereby extending the service life of the insulating part 400.

[0148] In summary, in the radial direction of the buffer 500 and in the axial direction of the buffer 500 , the matching groove 520 and the accommodating groove 510 are arranged at intervals.

[0149] The battery cell 1000 according to the embodiment of the present invention will be described below with reference to the accompanying drawings.

[0150] like Figure 7 As shown, a battery cell 1000 according to an embodiment of the present invention includes: a housing 300 , a cover plate assembly 200 and a pole core 320 .

[0151] Among them, Figure 7 As shown, 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 in detail herein.

[0152] Combination Figure 3 and Figure 7 As shown, the pole core 320 is arranged in the housing 300, and the pole core 320 is provided with a first connecting pole ear, and the first connecting pole ear is electrically connected to the pole post 250. Thus, the pole post 250 and the pole core 320 are electrically connected, so that the current of the pole core 320 can be led out by using the pole post 250, thereby ensuring the working performance of the pole core 320.

[0153] At the same time, by arranging the pole core 320 in the outer shell 300 , the outer 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 .

[0154] It can be known from the above structure that the battery cell 1000 of the embodiment of the utility model adopts the aforementioned cover plate assembly 200 to ensure the working performance of the battery cell 1000.

[0155] In some embodiments, the housing 300 is formed by stamping or welding, and the housing 300 is made of aluminum or steel.

[0156] 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.

[0157] In some embodiments, Figure 7 As shown, the battery cell 1000 further includes a current collecting plate 100, which is disposed between the first connecting pole lug and the cover plate assembly 200, and the current collecting plate 100 is electrically connected to the first connecting pole lug and the pole 250, respectively. Thus, the pole core 320 is electrically connected to the pole 250, so that the current of the pole core 320 can be led out by the pole 250, thereby ensuring the working performance of the pole core 320, that is, ensuring the working performance of the battery cell 1000.

[0158] In some embodiments, the current collecting plate 100 is respectively penetrated and welded with the first connecting pole lug and the pole post 250. This ensures that the pole core 320 and the pole post 250 are electrically connected, while also ensuring the connection strength between the current collecting plate 100 and the first connecting pole lug and the pole post 250, and reducing the difficulty of connecting the current collecting plate 100 and the first connecting pole lug and the pole post 250, thereby improving the assembly efficiency and structural stability of the battery cell 1000.

[0159] In some embodiments, in combination Figure 7 and Figure 8As shown, the current collecting plate 100 includes a plate body 140, at least a portion of the plate body 140 protrudes toward the pole core 320 to form a first connection portion 110 protruding toward the cover plate assembly 200 and a second connection portion 120 protruding toward the pole core 320 on the plate body 140, the first connection portion 110 is electrically connected to the pole 250, and the second connection portion 120 is electrically connected to the first connection pole ear. In this way, the pole 250 is electrically connected to the pole core 320, the difficulty of connecting the pole 250 to the pole core 320 is reduced, and the connection quality of the pole 250 to the pole core 320 is ensured.

[0160] In some embodiments, the current collecting plate 100 is formed by stamping to form a first connection portion 110 protruding toward the cover plate assembly 200 and a second connection portion 120 protruding toward the pole core 320 on the current collecting plate 100 , thereby reducing the difficulty of forming the current collecting plate 100 .

[0161] 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.

[0162] In some embodiments, the thickness of the first connection portion 110 is greater than the thickness of the second connection portion 120. The first connection portion 110 is thicker, so that the main body of the current collecting plate 100 is thicker, which is conducive to directly forming the first connection portion 110 and the second connection portion 120 on the current collecting plate 100, and to a certain extent, avoiding the breakage of the current collecting plate 100 during the molding process, and to a certain extent, avoiding the influence of the first connection portion 110 on the pole 250 when welding, thereby extending the service life of the pole core 320.

[0163] At the same time, by setting the thickness of the first connection part 110 to be greater than the thickness of the second connection part 120, it is also beneficial to set the thickness of the second connection part 120 to be thinner, which facilitates the welding of the second connection part 120 and the pole core 320 and increases the welding yield.

[0164] Alternatively, if Figure 8 As shown, 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 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 second connection portion 120 is greater than 0.8 mm, the difficulty of welding the second connection portion 120 and the pole core 320 will increase.

[0165] Therefore, the present application sets the thickness L1 of the second connection portion 120 to 0.1 mm to 0.8 mm, which can avoid the breakage of the collecting plate 100 to a certain extent, and also facilitate the welding of the second connection portion 120 and the pole core 320, thereby increasing the welding yield.

[0166] 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.

[0167] Alternatively, if Figure 8 As shown, the thickness of the first connection part 110 is L2, where 0mm<L2-L1≤0.5mm. That is, the thickness of the first connection part 110 is greater than the thickness of the second connection part 120, and the difference in thickness between the first connection part 110 and the second connection part 120 is less than 0.5mm, which can avoid the second connection part 120 being thicker to a certain extent, thereby avoiding that part of the structure of the disc body 140 cannot effectively bulge toward the direction of the pole core 320 to form the second connection part 120, reducing the difficulty of molding the collector disc 100, and at the same time reducing the weight of the collector disc 100 and reducing the production cost of the collector disc 100.

[0168] 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.

[0169] In some embodiments, in combination Fig. 9 and Fig.10 As shown, the collector plate 100 includes a first connection portion 110, an intermediate portion 130, and a second connection portion 120. The first connection portion 110, the intermediate portion 130, and the second connection portion 120 are stacked in the axial direction of the pole core 320. The first connection portion 110 is electrically connected to the pole column 250, and the second connection portion 120 is electrically connected to the first connection pole ear. In other words, the collector plate 100 is not limited to being formed to include a plate body 140, and the first connection portion 110 and the second connection portion 120 are directly formed on the plate body 140. The collector plate 100 can also be formed to include a first connection portion 110, an intermediate portion 130, and a second connection portion 120, wherein the axial direction of the pole core 320 mentioned here can also be understood as Figure 7As shown in the upper and lower directions, by arranging the first connecting portion 110, the middle 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 collecting plate 100 to connect two structural members (such as the pole 250 and the pole core 320) arranged in the upper and lower directions, thereby reducing the difficulty of connecting the pole 250 and the pole core 320 spaced apart in the upper and lower directions, thereby realizing the electrical connection between the pole core 320 and the pole 250, so as to facilitate the use of 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.

[0170] 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.

[0171] In some embodiments, during the processing of the collecting plate 100, the collecting plate 100 is first formed into Fig. 9 After the collecting plate 100 is processed, the collecting plate 100 is folded (such as Fig.10 As shown), the first connection portion 110, the middle portion 130, and the second connection portion 120 of the collecting plate 100 are stacked in the axial direction of the pole core 320, which facilitates the use of the collecting plate 100 to realize the 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 occupied space of the collecting plate 100, and reduces the difficulty of molding the collecting plate 100.

[0172] In some embodiments, in combination Figure 7 and Fig. 9 As shown, the battery cell 1000 also includes a negative electrode cover plate 260, and the negative electrode cover plate 260 and the cover plate body 210 are arranged on opposite sides of the pole core 320. The pole core 320 also includes a second connecting pole ear. The negative electrode cover plate 260 is electrically connected to the second connecting pole ear, so as to facilitate the use of the negative electrode cover plate 260 to lead out the current of the pole core 320 to ensure the working performance of the pole core 320.

[0173] Optionally, one of the first connecting electrode tab and the second connecting electrode tab is a positive electrode tab of the electrode core 320 , and the other is a negative electrode tab of the electrode core 320 .

[0174] Optionally, combined Figure 7 and Fig. 9As shown, 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 part 110, the middle part 130 and the second connecting part 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 reduce impedance and improve the space utilization and process feasibility of the battery cell 1000.

[0175] 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.

[0176] 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.

[0177] In some embodiments, Fig. 9 and Fig.10 As shown, when the current collecting plate 100 includes the first connecting portion 110, the middle portion 130 and the second connecting portion 120, the second connecting portion 120 further includes an identification area 122, and the identification area 122 is arranged near the connection between the middle portion 130 and the second connecting portion 120. That is, the identification area 122 is arranged near the connection between the middle portion 130 and the second connecting 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 second connecting portion 120, so as to facilitate the current collecting plate 100 to be removed from the Fig. 9 Folded to the shape Fig.10 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 reducing the area of ​​the second connecting portion 120 to a certain extent, thereby ensuring the connection area between the collecting plate 100 and the pole core 320 and improving the working performance of the battery cell 1000.

[0178] That is to say, by providing the identification area 122 , the present application can reduce the difficulty of molding the collecting plate 100 and limit the folding position of the collecting plate 100 to ensure the connection area between the second connecting portion 120 and the pole core 320 .

[0179] In some embodiments, Fig.10As shown, the line between the opposite side walls of the middle part 130 and the connection point of the second connecting part 120 is the first connecting line T1, and the minimum distance between the marking area 122 and the first connecting line T1 ranges from -2mm to +2mm. It can also be understood here that the line between the middle part 130 and the second 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 Fig.10 T2 shown in FIG.

[0180] 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.

[0181] 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 portion 120 and the pole core 320, the area of ​​the middle portion 130 can also be ensured, so that the first connecting portion 110, the middle portion 130 and the second connecting portion 120 can be effectively stacked in the axial direction of the pole core 320 to ensure the performance of the collecting plate 100.

[0182] 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.

[0183] Alternatively, if Fig. 9 As shown, 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, which can avoid to some extent the reduction of the structural strength of the collector plate 100 due to the setting of the identification area 122, and can also ensure that the identification area 122 has a certain width, so that it is convenient to use the identification area 122 to limit the folding position of the collector plate 100, and reduce the difficulty of molding the collector plate 100.

[0184] 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.

[0185] In some embodiments, in combination Fig. 9 and Fig.10 As shown, the identification area 122 is a through hole penetrating the second connection part 120 or a groove provided on the second connection part 120. That is to say, the identification area 122 can be formed as a through hole penetrating the second connection part 120, or can be formed as a groove provided on the second 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.

[0186] 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.

[0187] In some embodiments, Figure 7 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.

[0188] The battery assembly of the embodiment of the utility model is described below.

[0189] A battery assembly according to an embodiment of the present invention includes: a plurality of battery cells 1000 .

[0190] 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.

[0191] 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.

[0192] It should be noted that the battery assembly here can be a battery pack or a battery module, etc.

[0193] The electrical device of the embodiment of the utility model is described below.

[0194] An electrical device according to an embodiment of the utility model includes: a battery assembly.

[0195] Among them, the battery assembly is the aforementioned battery assembly, and the specific structure of the battery assembly is not described here.

[0196] 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.

[0197] 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.

[0198] 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.

[0199] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation" 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0200] The specific structures of the cover plate assembly 200 of the battery cell 1000 according to the embodiment of the utility model, the battery cell 1000, the battery assembly and other components of the electrical device such as the pole core 320 are known to ordinary technicians in the field and will not be described in detail here.

[0201] 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.

[0202] 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 cover plate assembly for a battery cell, characterized in that: include: A cover plate body, wherein the cover plate body is provided with a mounting opening; A pole, the pole being passed through the mounting opening; An insulating member, the insulating member is arranged at the mounting opening and is located between the pole and the cover body to insulate the cover body and the pole, the pole having a first limiting portion located on one side of the cover body, the first limiting portion being used to limit and fix the pole and the insulating member to the cover body; A buffer component is arranged between the insulating component and the first limiting portion.

2. The cover plate assembly of the battery cell according to claim 1, characterized in that: 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.

3. The cover plate assembly of the battery cell according to claim 2, characterized in that: The thickness H1 of the first limiting portion ranges from 0.5 mm to 1.5 mm.

4. The cover plate assembly of the battery cell according to claim 3, characterized in that: The thickness H2 of at least a portion of the buffer member located at the periphery of the first limiting portion is greater than the thickness H1 of the first limiting portion; And / or, a width H3 of at least a portion of the buffer component located at the periphery of the first limiting portion is in the range of 1 mm to 3 mm.

5. The cover plate assembly of the battery cell according to claim 2, characterized in that: The outer surface of the first limiting portion is flush with the outer surface of the buffer member located at the outer periphery of the first limiting portion.

6. The cover plate assembly of the battery cell according to claim 2, characterized in that: The width H4 of the receiving groove has a value range of 0.2 mm to 2 mm; And / or, a distance H5 between a bottom wall of the accommodating groove and a bottom wall of the buffer member is in a range of 0.4 mm to 2.5 mm.

7. The cover plate assembly of the battery cell according to claim 1, characterized in that: The pole and the buffer are connected by welding.

8. The cover plate assembly of the battery cell according to claim 1, characterized in that: 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.

9. The cover plate assembly of the battery cell according to claim 8, characterized in that: The blocking member is provided on both the inlet and the outlet.

10. The cover plate assembly of the battery cell according to claim 2, characterized in that: In the radial direction of the pole, the buffer member and the insulating member are limitedly matched to limit the movement and displacement of the buffer member.

11. The cover plate assembly of the battery cell according to claim 10, characterized in that: 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.

12. The cover plate assembly of the battery cell according to claim 10, characterized in that: 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 matching groove, the second protrusion matches with the matching groove, and a part of the buffer member is matched with the stop surface.

13. The cover plate assembly of the battery cell according to claim 12, characterized in that: The depression depth H6 of the matching groove has a value range of 0.3 mm to 1 mm.

14. The cover plate assembly of the battery cell according to claim 12, characterized in that: The matching groove and the accommodating groove are arranged at intervals in the thickness direction of the buffer member.

15. The cover plate assembly of the battery cell according to claim 14, characterized in that: In the radial direction of the buffer, the minimum spacing H7 between the matching groove and the accommodating groove is 0.35 mm-1.5 mm; And / or, in the axial direction of the buffer, the recessed depth of the matching groove is smaller than the distance between the bottom wall of the accommodating groove and the bottom wall of the buffer.

16. A battery cell, characterized in that: include: shell; A cover plate assembly, the cover plate assembly being arranged at an end of the housing, the cover plate assembly being the cover plate assembly according to any one of claims 1 to 15; A pole core is disposed in the shell, and the pole core is provided with a first connecting pole lug, and the first connecting pole lug is electrically connected to the pole column.

17. The battery cell according to claim 16, characterized in that: It also includes a current collecting plate, which is arranged between the first connecting electrode lug and the cover plate assembly, and the current collecting plate is electrically connected to the first connecting electrode lug and the pole respectively.

18. The battery cell according to claim 17, characterized in that: The current collecting plate includes a plate 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 plate 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.

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

20. The battery cell according to claim 17, characterized in that: The current collecting plate includes a first connecting portion, a middle portion, and a second connecting portion, wherein the first connecting portion, the middle portion, and the second connecting portion are stacked in the axial direction of 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 lug.

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

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

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