Battery cell, battery, and electrical apparatus

Abstract

A battery cell, a battery, and an electrical apparatus, relating to the technical field of batteries. The battery cell comprises a casing, a pole body, and a pole cover plate; a mounting hole is formed on the casing; an accommodating cavity is defined in the casing; the pole body penetrates through the mounting hole, and comprises an abutment portion abutting against the outer portion of the casing; a recess is formed on the end of the pole body away from the accommodating cavity; the recess is arranged close to the central axis of the mounting hole relative to the abutment portion; the pole cover plate covers the pole body, and comprises a connecting portion connected to the pole body; the connecting portion is arranged in the recess and is connected to the portion of the pole body that is located on the side of the recess close to the accommodating cavity, and is spaced apart from the wall of the side of the recess close to the abutment portion.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311204427.9 and application date 2023-09-18, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a battery cell, a battery, and an electrical device. Background Art

[0004] In recent years, new energy vehicles have experienced rapid development. In the electric vehicle sector, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Power batteries consist of several battery cells, but the reliability of these cells needs to be improved.

[0005] Summary of the Invention

[0006] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can improve the reliability of the battery cell.

[0007] In the first aspect, an embodiment of the present application provides a battery cell, comprising a shell, a pole body and a pole cover plate, the shell having a mounting hole, a housing cavity defined therein, the pole body passing through the mounting hole, and comprising a supporting portion that supports against the outside of the shell, a recessed groove being formed at the end of the pole body away from the housing cavity, the recessed groove being arranged relative to the supporting portion close to the central axis of the mounting hole, the pole cover plate being covered on the pole body, and comprising a connecting portion connected to the pole body, the connecting portion being arranged in the recessed groove and connected to a portion of the pole body located on the side of the recessed groove close to the housing cavity, and spaced apart from a side wall of the recessed groove close to the supporting portion.

[0008] In the above technical solution, by connecting the connecting portion to the portion of the pole body located near the accommodating cavity of the recessed groove, and separating the connecting portion from the groove wall of the recessed groove near the abutting portion to form a spacing space, this arrangement not only meets the connection requirements between the pole cover and the pole body, but also the force generated by the connection between the pole cover and the pole body can be blocked by the spacing space, thereby reducing the transmission of this force to the abutting portion, thereby facilitating the improvement of the problem of the abutting portion tilting due to this force, improving the reliability of the abutment between the abutment portion and the housing, and further improving the connection reliability and sealing tightness of the pole body and the housing, thereby improving the reliability of the battery cell. Moreover, since the problem of the abutment portion tilting can be improved, it is conducive to improving the problem of the assembly and connection of the busbar component affected by the tilting of the abutment portion, thereby improving the smoothness and reliability of the connection between the busbar component and the pole cover. In addition, since the connection portion between the pole cover and the pole body is spaced apart from the side wall of the recessed groove close to the abutting portion, the assembly clearance requirement between the pole cover and the pole body can be reduced, the processing accuracy requirement for the pole cover can be reduced, and the compatibility of the pole body can be increased.

[0009] In some embodiments, the connecting portion is welded to a portion of the pole body located on a side of the sink close to the accommodating cavity.

[0010] In the above technical solution, welding the connection portion to the pole body improves the connection reliability between the pole body and the pole cover, eliminates other connection components, simplifies the structure, and reduces costs. Furthermore, because the connection portion is welded to the portion of the pole body located near the accommodating cavity of the sink, and the molten pool formed on the connection portion solidifies and is separated from the side wall of the sink near the abutment portion, the shrinkage stress generated by the solidification of the molten pool is blocked, making it difficult or less likely to be transmitted to the abutment portion, thereby alleviating the problem of warping of the abutment portion.

[0011] In some embodiments, the pole body includes a penetration portion penetrated through the mounting hole, and at least a portion of the connecting portion is disposed on and connected to the penetration portion.

[0012] In the above technical solution, by disposing at least a portion of the connecting portion on and connected to the penetration portion, the penetration portion penetrates the mounting hole, thereby allowing the penetration portion to have a relatively sufficient size in the axial direction of the mounting hole to connect with the connecting portion. This can help improve the connection reliability between the pole body and the pole cover. For example, when the connecting portion and the penetration portion are welded, sufficient penetration can be achieved, thereby improving the welding reliability of the two.

[0013] In some embodiments, the penetration portion is formed in a ring shape, and the radial width of the connecting portion covering the pole body is smaller than the radial wall thickness of the penetration portion.

[0014] In the above technical solution, when the penetration portion is annular, the radial width of the connecting portion covering the pole body is set to be smaller than the radial wall thickness of the penetration portion, so that the radial wall thickness of the penetration portion is sufficient to support and connect the connecting portion to the connecting portion, thereby improving the connection reliability between the pole body and the pole cover. For example, when the connecting portion and the penetration portion are welded, the connecting portion can be welded only to the penetration portion, and a sufficient weld width is provided at the connection, thereby improving the welding reliability of the two.

[0015] In some embodiments, the supporting portion is connected to the piercing portion and extends relative to the piercing portion in a direction away from the central axis of the mounting hole. The supporting portion protrudes from the piercing portion in a direction away from the accommodating cavity to define a groove between the surface of the supporting portion close to the central axis of the mounting hole and the surface of the piercing portion away from the accommodating cavity.

[0016] In the above technical solution, the countersunk groove is defined by the supporting portion and the penetrating portion, simplifying the structure of the pole body and making the groove easier to design and manufacture. Furthermore, compared to the solution in which the penetrating portion's surface, facing away from the accommodating cavity, is partially recessed to form the groove, the radial outer boundary of the groove can extend away from the central axis of the mounting hole, facilitating mating with the connecting portion of the pole cover and facilitating the spacing requirement between the sidewalls of the groove and the connecting portion.

[0017] In some embodiments, the depth of the countersunk groove in the axial direction of the mounting hole is one third to two thirds of the thickness of the abutting portion in the axial direction of the mounting hole.

[0018] In the above technical solution, the depth of the sinking groove is not too deep to ensure that the connection position between the supporting portion and the penetration portion has a relatively sufficient wall thickness, so as to improve the structural strength of the weak point of the pole body, and the depth of the sinking groove is not too shallow, so that the connecting portion can be accommodated in the sinking groove to a large extent, thereby reducing the volume of the connecting portion protruding outside the sinking groove, and improving the interference problem caused by the protrusion of the connecting portion to the assembly and connection of the confluence component.

[0019] In some embodiments, the penetration portion is formed in an annular shape, and one side of the sinking groove close to the central axis of the mounting hole is open to communicate with the inner annular area of ​​the penetration portion.

[0020] In the above technical solution, when the penetration portion is formed into a ring shape, the side of the sinking groove close to the central axis of the mounting hole is opened to connect with the inner ring area of ​​the penetration portion, which can further simplify the design and processing of the sinking groove. Compared with the solution of "when the penetration portion is formed into a ring shape, the side of the sinking groove close to the central axis of the mounting hole is closed", the radial inner boundary of the sinking groove can be extended in the direction close to the central axis of the mounting hole, which is convenient for cooperation with the pole cover plate, and is conducive to simplifying the structural design of the pole cover plate.

[0021] In some embodiments, the supporting portion includes a first section and a second section arranged in sequence along a direction away from the penetrating portion, with a surface perpendicular to the axial direction of the mounting hole as the projection surface, and the axial direction of the mounting hole as the projection direction. The projection of the first section on the projection surface is located within the projection of the mounting hole on the projection surface, and the projection of the second section on the projection surface is located outside the projection of the mounting hole on the projection surface.

[0022] In the above technical solution, the second section can be abutted against the shell to meet the abutment and matching requirements of the pole body and the shell. Moreover, since there is a first section between the second section and the recessed groove that is not used to abut against the shell, the first section is used to define the side wall of the recessed groove, thereby improving the problem of the second section tilting due to the connection between the connecting part and the penetrating part, which is beneficial to improving the reliability of the abutment and matching between the abutting part and the shell.

[0023] In some embodiments, the abutment portion of the pole body is formed by riveting with flanges.

[0024] In the above technical solution, the pole body is easy to process and the recess can be easily obtained. Moreover, when the abutting portion is connected to the penetration portion, the connection reliability of the abutting portion and the penetration portion is improved, and the assembly reliability of the pole body and the housing is improved.

[0025] In some embodiments, the distance between the connecting portion and a side wall of the sinking groove close to the abutting portion gradually increases in a direction away from the accommodating cavity.

[0026] In the above technical solution, the assembly of the connecting part to the sink groove is facilitated, and at positions with larger intervals, corresponding to positions where the solidification shrinkage deformation of the welding molten pool is larger, by setting larger intervals, it is beneficial to further improve the warping problem of the supporting part. In addition, at positions with smaller intervals, it is beneficial to improve the structural strength of the pole body at the position where the wall thickness is smaller due to the setting of the groove.

[0027] In some embodiments, the cross-sectional area of ​​the sink gradually increases in a direction away from the accommodating cavity.

[0028] In the above technical solution, the recessed groove is flared, which facilitates the assembly of the connection portion of the pole cover plate and the recessed groove, improving the assembly efficiency of the pole cover plate and the pole body. Furthermore, the flared recessed groove facilitates a design in which the distance between the connection portion and the side of the recessed groove near the abutting portion gradually increases as it moves away from the accommodating cavity.

[0029] In some embodiments, the pole cover includes a cover body, the connecting portion is located at an edge of the cover body, and a side surface of the cover body away from the accommodating cavity protrudes from a side surface of the connecting portion away from the accommodating cavity.

[0030] In the above technical solution, interference with the assembly of the busbar component caused by the protrusion of the connecting portion from the cover body can be avoided, thereby improving the assembly convenience of the busbar component and the connection reliability between the busbar component and the pole cover.

[0031] In some embodiments, the thickness of the supporting portion in the axial direction of the mounting hole is greater than the thickness of the connecting portion in the axial direction of the mounting hole.

[0032] In the above technical solution, since the thickness of the supporting portion is larger than that of the connecting portion, deformation of the supporting portion is reduced, and the problem of warping of the supporting portion caused by the connection between the connecting portion and the pole body is further improved.

[0033] In some embodiments, the thickness of the connecting portion in the axial direction of the mounting hole is three quarters to five quarters of the depth of the countersunk groove in the axial direction of the mounting hole.

[0034] In the above technical solution, the thickness H2 of the connecting portion in the axial direction of the mounting hole is close to the depth H3 of the recess in the axial direction of the mounting hole, and the connecting portion can be roughly received in the recess to reduce the interference effect on the assembly of the conduit component caused by the connecting portion protruding from the outer surface of the supporting portion.

[0035] In some embodiments, a surface of the connecting portion away from the accommodating cavity extends obliquely along a direction away from the central axis of the mounting hole toward a direction close to the accommodating cavity.

[0036] In the above technical solution, since the thickness of the connection part near the cover body is relatively thick, and the thickness near the side wall of the groove is relatively thin, the processing and forming of the connection part of the pole cover is facilitated, material waste is reduced, and costs are reduced. Moreover, since the thickness of the connection part near the cover body is relatively thick, and the thickness of the side wall of the groove near the groove is relatively thin, the reliability of the connection part formed to connect the pole cover and the pole body can be improved. Moreover, since the wall thickness of the pole cover at the connection part is reduced, it is helpful to avoid the interference caused by the connection between the connection part and the pole body on the assembly of the convergence component. In addition, when the connection part is connected to the pole body by laser welding, by setting the connection part to the above-mentioned inclined form, the laser reflection path and the laser incident path can form an angle, thereby improving the problem of laser reflection damaging the laser and having the effect of protecting the laser.

[0037] In some embodiments, the pole body includes a penetration portion that is penetrated through the mounting hole, the supporting portion is connected to the penetration portion and extends relative to the penetration portion in a direction away from the central axis of the mounting hole, and the battery cell also includes an insulating sealing structure for insulating and sealing the shell and the pole body, and the insulating sealing structure includes a portion provided between the penetration portion and the shell and a portion provided between the supporting portion and the shell.

[0038] In the above technical solution, the provision of an insulating sealing structure allows indirect contact between the pole body and the housing, ensuring an insulated and sealed connection between the housing and the pole body. This eliminates the need to design the housing or pole body into a complex composite structure for insulation and sealing, thereby simplifying the design and processing of the housing and pole body. Furthermore, because the insulating sealing structure includes both a portion disposed between the penetration portion and the housing and a portion disposed between the abutment portion and the housing, the stability of the insulating sealing structure and the adequacy of the insulating seal can be improved, thereby enhancing the reliability of the insulating sealing effect achieved by the insulating sealing structure.

[0039] In some embodiments, the connection between the supporting portion and the penetrating portion has a first corner set toward the shell, the corner of the shell set close to the first corner is the second corner, the insulating sealing structure includes a third corner set corresponding to the first corner, and a fourth corner set corresponding to the second corner, and at least one of the first corner, the second corner, the third corner and the fourth corner is formed as a chamfer.

[0040] In the above technical solution, by using chamfers instead of right angles, the force-bearing area or force-applying area can be increased, local pressure and stress concentration can be reduced, the risk of cracking of the insulating sealing structure at the third corner or the fourth corner, which are prone to cracking, can be reduced, the structural stability of the insulating sealing structure can be improved, and the reliability of the insulating sealing structure in achieving the insulating sealing effect can be improved.

[0041] In some embodiments, the connection between the supporting portion and the penetrating portion has a first corner set toward the shell, and the corner of the shell set close to the first corner is the second corner. The insulating sealing structure includes a third corner set corresponding to the first corner, and a fourth corner set corresponding to the second corner. There is a fitting gap between the first corner and the third corner, and / or there is a fitting gap between the second corner and the fourth corner.

[0042] In the above technical solution, when there is a matching clearance between the first corner and the third corner, the first corner can reduce the pressure on the third corner, thereby reducing the risk of the insulating sealing structure cracking at the third corner. When there is a matching clearance between the second corner and the fourth corner, the second corner can reduce the pressure on the fourth corner, thereby reducing the risk of the insulating sealing structure cracking at the fourth corner.

[0043] In some embodiments, the connection between the supporting portion and the penetrating portion has a first corner set toward the shell, and the corner of the shell set close to the first corner is a second corner. The insulating sealing structure includes a first part and a second part. The material hardness of the first part is less than the material hardness of the second part. The first part is set relative to the second part close to at least one of the first corner and the second corner.

[0044] In the above technical solution, when the pole body is assembled and fixed to the shell, the insulating sealing structure is easily cracked at the first part with a relatively soft material hardness. The first part is easily compressed and deformed under force and absorbs the force, thereby reducing the risk of cracking here.

[0045] In some embodiments, the first part includes a first sub-part, which is arranged near the first corner relative to the second part, and the first sub-part defines a portion of the side surface of the insulating sealing structure facing the supporting part, and / or defines a portion of the side surface of the insulating sealing structure facing the penetrating part.

[0046] In the above technical solution, the first sub-section is exposed on the outer surface of the insulating sealing structure near the first corner, so that it can better undergo compression deformation under stress, which is more beneficial to alleviating the cracking problem at this location. In addition, it can reduce the difficulty of combining the first sub-section and the second part for processing.

[0047] In some embodiments, the end of the penetration portion connected to the supporting portion and the supporting portion constitute a first pole portion, the insulating sealing structure includes a first insulating seal fitted between the first pole portion and the shell, and a gasket is provided between the first pole portion and the shell for buffering the force applied by the first pole portion to the first insulating seal.

[0048] In the above technical solution, by providing a gasket, the force applied by the first pole part to the first insulating seal can be reduced, which can reduce the damage to the first insulating seal, thereby protecting the first insulating seal and improving the cracking problem of the first insulating seal.

[0049] In some embodiments, the gasket is provided between the housing and the first insulating seal, and / or between the first pole portion and the first insulating seal.

[0050] In the above technical solution, the assembly of the gasket is facilitated, the production difficulty is reduced, and the first insulating seal can be an integral part, which facilitates the processing and assembly of the first insulating seal.

[0051] In some embodiments, the gasket includes at least one of a first gasket, a second gasket and a third gasket, the first gasket is arranged between the supporting portion and the first insulating seal, the second gasket is arranged between the penetrating portion and the first insulating seal, and the third gasket is arranged between the first insulating seal and the outer surface of the shell, and the material hardness of the third gasket is less than the material hardness of the first insulating seal.

[0052] In the above technical solution, when a first gasket is provided between the first insulating seal and the abutting portion, when the pole body is mounted on the housing and the abutting portion presses the first insulating seal toward the housing, the first gasket can reduce the force transmitted to the first insulating seal, thereby reducing damage to the first insulating seal. When a second gasket is provided between the first insulating seal and the penetration portion, when the pole body is mounted on the housing and the penetration portion presses the first insulating seal toward the housing, the second gasket can reduce the force transmitted to the first insulating seal, thereby reducing damage to the first insulating seal. When a third gasket is provided between the first insulating seal and the housing, when the pole body is mounted on the housing and the pole body presses the first insulating seal toward the housing, the first insulating seal can transmit the force to the third gasket. Since the material hardness of the third gasket is relatively low, it can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the first insulating seal. This acts to buffer the force applied by the first pole portion to the first insulating seal, thereby reducing damage to the first insulating seal.

[0053] In some embodiments, a receiving groove is formed on the pole body, which is open in a direction away from the receiving cavity. The sink groove is arranged around the receiving groove and is connected to the receiving groove. The pole body has a connecting hole, which passes through the groove wall on one side of the receiving groove close to the receiving cavity and connects the receiving cavity and the receiving groove.

[0054] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving tank and then flow toward the receiving cavity through the connecting hole, wherein the receiving tank can play the role of buffering the electrolyte to improve the problems of electrolyte splashing, overflowing, etc. Moreover, the side wall of the receiving tank (i.e., the tank wall extending from the notch of the receiving tank toward the receiving cavity) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell, there is no need to perform special processing on the shell, which is conducive to reducing the structural complexity and processing difficulty of the shell.

[0055] In some embodiments, the battery cell includes a cell assembly, which includes an active material coating portion received in a receiving cavity, and a conductive portion connected to the active material coating portion, wherein the conductive portion is passed through a connecting hole to be at least partially received in the receiving groove.

[0056] In the above technical solution, by accommodating at least part of the conductive part in the receiving groove, at least part of the conductive part occupies the space in the receiving groove, thereby reducing the space occupied by the conductive part in the receiving cavity, saving space in the receiving cavity to accommodate a larger volume of active material coating part, which is beneficial to improving the energy density of the battery cell, or when the energy density of the battery cell remains unchanged, it is beneficial to reduce the size of the battery cell.

[0057] In some embodiments, a liquid injection hole that can communicate with the receiving groove is formed on the pole cover, and the battery cell further includes a sealing structure for sealing the liquid injection hole.

[0058] In the above technical solution, by processing the injection hole on the pole cover, the opening is relatively small and located outside, so that the injection inlet can be reliably sealed more easily through the sealing structure, thereby improving the working reliability of the battery cell and realizing flexible and diversified design of the sealing structure.

[0059] In the second aspect, the embodiment of the present application also provides a battery cell, including a shell, a pole body and a pole cover plate, the shell having a mounting hole, and a accommodating cavity defined in the shell, the pole body including a penetration portion penetrating the mounting hole and a supporting portion supported on the outside of the shell, the supporting portion being connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, a recessed groove open in a direction away from the accommodating cavity is formed between the supporting portion and the penetration portion, the pole cover plate being covered on the pole body, the edge of the pole cover plate being arranged in the recessed groove, and being penetrated and welded to the penetration portion, and the welding structure formed by the welding is spaced apart from the supporting portion.

[0060] In the above technical solution, since the edge of the pole cover is arranged in the recessed groove and is penetrated and welded with the penetration portion, and the welding structure formed by welding is separated from the supporting portion, it is beneficial to improve the problem of the supporting portion warping caused by welding, improve the reliability of the supporting portion and the shell, and then improve the connection reliability and sealing tightness of the pole body and the shell, thereby improving the reliability of the battery cell.

[0061] On the third aspect, an embodiment of the present application also provides a battery cell, including a shell, a pole body and a pole cover plate, the shell has a mounting hole, the pole body is passed through the mounting hole, and includes a supporting portion that supports the outside of the shell, the pole cover plate is covered on the pole body, and includes a connecting portion connected to the pole body, with a surface perpendicular to the axial direction of the mounting hole as the projection surface, and the axial direction of the mounting hole as the projection direction, and the projection of the part of the supporting portion that abuts against the shell on the projection surface is separated from the projection of the connecting portion on the projection surface.

[0062] In the above technical solution, since the projection of the part of the supporting portion that abuts against the shell on the projection surface is separated from the projection of the connecting portion on the projection surface, it is beneficial to improve the problem of the supporting portion being lifted up due to the connection between the connecting portion and the pole body, and improve the reliability of the abutment between the supporting portion and the shell, thereby improving the connection reliability and sealing tightness between the pole body and the shell, thereby improving the reliability of the battery cell.

[0063] In some embodiments, the pole body includes a penetration portion that is penetrated by the mounting hole, the supporting portion is connected to the penetration portion and extends relative to the penetration portion in a direction away from the central axis of the mounting hole, a projection of the supporting portion on the projection surface is partially located within the projection range of the mounting hole on the projection surface, the projection of the connecting portion on the projection surface is located within the projection range of the penetration portion on the projection surface, and the connecting portion is provided on the penetration portion and connected to the penetration portion.

[0064] In the above technical solution, the connecting portion can be further away from the portion of the supporting portion abutting against the shell, thereby further improving the warping problem of the portion of the supporting portion abutting against the shell.

[0065] In a fourth aspect, an embodiment of the present application further provides a battery comprising a battery cell according to any of the above solutions.

[0066] In the above technical solution, since the reliability of the battery cell according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery.

[0067] In a fifth aspect, an embodiment of the present application further provides an electrical device comprising a battery according to any of the above-mentioned solutions.

[0068] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0069] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0070] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0071] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0072] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0073] FIG4 is a schematic orthographic projection diagram of a battery cell provided in some embodiments of the present application;

[0074] FIG5 is a cross-sectional view along line AA in FIG4 ;

[0075] FIG6 is a partial enlarged view of FIG5;

[0076] FIG7 is a partial enlarged view of the circled portion B in FIG6 ;

[0077] FIG8 is a partial enlarged view of the circled portion C in FIG7 ;

[0078] FIG9 is an assembly cross-sectional view of a pole body and a pole cover plate, etc., provided in some embodiments of the present application;

[0079] FIG10 is a partial enlarged view of the circled portion D in FIG9 ;

[0080] FIG11 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0081] FIG12 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0082] FIG13 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0083] FIG14 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0084] FIG15 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0085] FIG16 is a cross-sectional view of an assembly of a pole cover and a sealing structure provided by some embodiments of the present application;

[0086] FIG17 is an assembly diagram of a pole cover and a sealing structure provided in some embodiments of the present application;

[0087] FIG18 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0088] FIG19 is a schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0089] : Vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; housing 101; first housing body 1011; second housing body 1012; battery cell 102; current collector 103; housing 1; accommodating chamber 11; mounting hole 12; central axis L; first housing wall 13; second corner 131; second housing wall 14; pole 2; pole body 3; recess 31; recess side wall 311; recess bottom wall 312; supporting portion 32; first section 321; second section 322; penetration portion 33; upper end portion 331; lower end portion 332; first corner 34; first pole portion 35; accommodating groove 36; communicating hole 37; flange portion 38; second pole portion 39; pole cover 4; connecting portion 41; outer surface of the connecting portion 411; cover body 42; injection hole 43; first hole section 431; second hole section 432; third hole section 433; spacing space S; welding structure 5; sealing structure 6; first sealing member 61; second sealing member 62; battery cell assembly 7; active material coating portion 71; conductive portion 72; insulating sealing structure 8; third corner 81; fourth corner 82; first part 83; first sub-portion 831; second sub-portion 832; second part 84; first insulating seal 85; second insulating seal 86; third insulating seal 87; gasket 9; first gasket 91; second gasket 92; third gasket 93. DETAILED DESCRIPTION

[0090] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0091] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0092] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0093] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0094] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0095] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0096] The term "plurality" used in this application refers to two or more (including two).

[0097] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0098] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a casing for enclosing one or more battery cells or one or more battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0099] A battery cell consists of a housing, a cell assembly, and an electrolyte. The housing holds the cell assembly and electrolyte. The cell assembly includes at least one electrode assembly, which consists of a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly can be a wound or stacked structure. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0100] A positive electrode sheet generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The uncoated positive current collector protrudes from the coated positive current collector, serving as the positive tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

[0101] A negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon, silicon, or other materials.

[0102] To ensure that high currents can pass without melting, the positive electrode tabs are multiple and stacked together to form the positive electrode tab portion, and the negative electrode tabs are multiple and stacked together to form the negative electrode tab portion. The housing is provided with a pole post, and the positive electrode tab portion is electrically connected to the positive electrode post, and the negative electrode tab portion is electrically connected to the negative electrode post. For example, the tab portion can be connected to the pole post to form a direct electrical connection between the tab portion and the pole post. For another example, the battery cell assembly can include an adapter plate, the tab portion is connected to the adapter plate, and the adapter plate is connected to the pole post to form an indirect electrical connection between the tab portion and the pole post.

[0103] The material of the isolation film is not limited, and can be, for example, polypropylene or polyethylene.

[0104] Some battery cells in the related art have poles on their shells, which are electrically connected to the battery cell components inside the shell to achieve electrode output. When the pole includes a pole body and a pole cover, the pole body is mounted on the shell, the pole cover is mounted on the pole body, and the edge of the pole cover is welded to the edge of the pole body. When the molten pool formed by welding shrinks, it is easy to cause the edge of the pole body to warp, which has an adverse effect on the connection reliability and sealing tightness between the pole body and the shell. Moreover, when it is necessary to weld a busbar component on the pole cover, if the edge of the pole body warps, it will affect the assembly and connection of the busbar component to the pole cover.

[0105] To this end, an embodiment of the present application proposes a battery cell, including a shell, a pole body and a pole cover plate, the shell having a mounting hole, a accommodating cavity defined in the shell, the pole body passing through the mounting hole, and including a supporting portion that abuts against the outside of the shell, a recessed groove is formed at the end of the pole body away from the accommodating cavity, the recessed groove is arranged relative to the supporting portion and close to the central axis of the mounting hole, the pole cover plate is covered on the pole body, and includes a connecting portion connected to the pole body, the connecting portion is arranged in the recessed groove and connected to a portion of the pole body located on the side of the recessed groove close to the accommodating cavity, and is spaced apart from a side groove wall of the recessed groove close to the supporting portion.

[0106] Therefore, by connecting the connecting portion to the portion of the pole body located on the side of the recessed groove close to the accommodating cavity, and separating the connecting portion from the groove wall on one side of the recessed groove close to the supporting portion to form a spacing space, such an arrangement can not only meet the connection requirements of the pole cover and the pole body, but also the force generated by the connection between the pole cover and the pole body can be blocked by the spacing space to reduce the force transmitted to the supporting portion, thereby helping to improve the problem of the supporting portion tilting due to the force, improving the reliability of the supporting portion and the shell, and then improving the connection reliability and sealing tightness of the pole body and the shell, thereby improving the reliability of the battery cell.

[0107] Furthermore, since the problem of warping of the abutment portion can be improved, the problem of the abutment portion warping affecting the assembly and connection of the busbar assembly can be alleviated, thereby improving the smoothness and reliability of the connection between the busbar assembly and the pole cover. In addition, since the connection portion between the pole cover and the pole body is separated from the side wall of the recessed groove near the abutment portion, the assembly clearance requirement between the pole cover and the pole body can be reduced, the processing accuracy requirement for the pole cover can be reduced, and the compatibility of the pole body can be increased.

[0108] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0109] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0110] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0111] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0112] Please refer to Figure 2, which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the box body 101. The box body 101 is used to provide an assembly space for the battery cells 102, and the box body 101 can adopt a variety of structures. In some embodiments, the box body 101 may include a first box body 1011 and a second box body 1012, and the first box body 1011 and the second box body 1012 cover each other, and the first box body 1011 and the second box body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 can be a hollow structure with one end open, and the first box body 1011 can be a plate-like structure. The first box body 1011 covers the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define an assembly space. The first box body 1011 and the second box body 1012 can also be hollow structures with one side open, and the open side of the first box body 1011 covers the open side of the second box body 1012. Of course, the box body 101 formed by the first box body 1011 and the second box body 1012 can be of various shapes, such as a cylinder, a cuboid, etc.

[0113] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the multiple battery cells 102. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 102 is housed within the housing 101. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 102 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 101. The battery 100 may also include other structures, such as a busbar assembly for electrically welding the multiple battery cells 102 together.

[0114] Each battery cell 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 can be cylindrical, flat, or rectangular. For example, referring to the embodiment shown in FIG3 , the length of the battery cell 102 is a first direction X, the width of the battery cell 102 is a second direction Y, and the height of the battery cell 102 is a third direction Z. The first direction X, the second direction Y, and the third direction Z are mutually perpendicular.

[0115] According to the first embodiment of the present application, a battery cell 102 is proposed. In conjunction with Figures 4 to 6, the battery cell 102 includes: a shell 1 and a pole 2. The pole 2 is provided in the shell 1, and a receiving cavity 11 is formed inside the shell 1. Exemplarily, the battery cell 102 includes a cell assembly 7. The cell assembly 7 may include an active material coating portion 71 and a conductive portion 72 connected to the active material coating portion 71. The active material coating portion 71 is received in the receiving cavity 11. The conductive portion 72 is welded to the pole 2 so that the conductive portion 72 is electrically connected between the active material coating portion 71 and the pole 2. In conjunction with Figures 6 and 7, the pole 2 includes a pole body 3 and a pole cover 4 provided on the pole body 3. The conductive portion 72 may be welded to the pole body 3, or the conductive portion 72 may be welded to the pole cover 4, so that the conductive portion 72 and the pole 2 can be electrically connected.

[0116] 6 and 7 , the housing 1 has a mounting hole 12. When the housing 1 is not assembled with other components, the mounting hole 12 is in communication with the accommodating cavity 11. The pole body 3 is inserted through the mounting hole 12 and includes a supporting portion 32 that abuts against the outside of the housing 1. Specifically, at least a portion of the supporting portion 32 directly or indirectly contacts a side wall of the housing 1 facing away from the accommodating cavity 11 (i.e., the outer wall of the housing 1), thereby forming a supporting relationship. Thus, under the resisting action of the housing 1, the pole body 3 is prevented from moving relative to the housing 1 toward the accommodating cavity 11. Exemplarily, the housing 1 includes a first housing wall 13. The mounting hole 12 is formed in the first housing wall 13. With the axial direction of the mounting hole 12 as the projection direction and the plane perpendicular to the axial direction of the mounting hole 12 as the projection plane, the projection of the supporting portion 32 on the projection plane and the projection of the first housing wall 13 on the projection plane have an intersection area. The portion of the supporting portion 32 corresponding to the intersection area directly or indirectly contacts the housing 1, thereby forming a supporting relationship.

[0117] It is worth noting that the pole body 3 may abut against the outer wall of the housing 1 not only through the abutting portion 32. For example, in some embodiments, a local structure of the pole body 3 located outside the housing 1 and used to define the bottom wall 312 of the recessed groove 31 also abuts against the outer wall of the housing 1. Therefore, in the embodiments of the present application, the pole body 3 may abut against the outer wall of the housing 1 only through the abutting portion 32, or may abut against the outer wall of the housing 1 through the abutting portion 32 and other portions other than the abutting portion 32.

[0118] In addition, in some embodiments of the present application, the pole body 3 may also have a portion that is supported by the shell 1, that is, a portion of the pole body 3 is in direct or indirect contact with a side wall of the shell 1 close to the accommodating cavity 11 (that is, the inner wall surface of the shell 1), or the pole body 3 may not extend into the shell 1, and only include a portion that passes through the mounting hole 12 and a portion located outside the shell 1, which is not limited here.

[0119] 6 and 7 , a recessed groove 31 is formed at the end of the pole body 3 away from the accommodating cavity 11. The recessed groove 31 is positioned relative to the abutting portion 32 and closer to the central axis L of the mounting hole 12. The recessed groove 31 is recessed toward the accommodating cavity 11 and open in a direction away from the accommodating cavity 11. The notch of the recessed groove 31 is located on a side surface of the pole body 3 away from the accommodating cavity 11. The recessed groove 31 is positioned around the central axis L of the mounting hole 12, and the abutting portion 32 is positioned relative to the recessed groove 31 and further away from the central axis L of the mounting hole 12.

[0120] 6 and 7 , the pole cover 4 is provided on the pole body 3 and includes a connecting portion 41 connected to the pole body 3 . The connecting portion 41 is provided in the sink 31 and is connected to a portion of the pole body 3 located on the side of the sink 31 close to the accommodating cavity 11 , and the connecting portion 41 is spaced apart from a side wall of the sink 31 close to the abutting portion 32 . Exemplarily, a portion of the pole cover plate 4 can be arranged on the bottom wall 312 of the groove 31, and the bottom wall 312 is a side surface of the groove 31 close to the accommodating cavity 11. The portion of the pole cover plate 4 is connected to the pole body 3, for example, by welding through the bottom wall 312, or bonding to the bottom wall 312, or connecting through fasteners passing through the bottom wall 312, so as to realize the connection between the pole cover plate 4 and the pole body 3. The portion of the pole cover plate 4 is the connecting portion 41, and there is a spacing S between the connecting portion 41 and the groove side wall 311 of the groove 31. The groove side wall 311 is a side surface of the groove 31 close to the supporting portion 32. It is worth noting that when this part of the pole cover 4 is connected to the pole body 3 by welding through the bottom wall 312 of the groove, the connecting portion 41 can be formed into a solidified structure formed by solidification of the molten pool. At this time, the connecting portion 41 is separated from the groove wall on one side of the groove 31 close to the abutting portion 32, which means that the solidified structure is separated from the groove wall on one side of the groove 31 close to the abutting portion 32.

[0121] Therefore, by connecting the connecting portion 41 to the portion of the pole body 3 located on the side of the recess 31 close to the accommodating cavity 11, and separating the connecting portion 41 from the groove wall on one side of the recess 31 close to the supporting portion 32 to form a spacing space S, such an arrangement can not only meet the connection requirements between the pole cover 4 and the pole body 3, but also the force generated by the connection between the pole cover 4 and the pole body 3 can be blocked by the spacing space S to reduce the force transmitted to the supporting portion 32, thereby helping to improve the problem of the supporting portion 32 being tilted due to the force, improving the reliability of the supporting portion 32 and the shell 1, and then improving the connection reliability and sealing tightness of the pole body 3 and the shell 1, thereby improving the reliability of the battery cell 102.

[0122] Furthermore, since the problem of warping of the abutting portion 32 can be improved, the problem of the warping of the abutting portion 32 affecting the assembly and connection of the current collecting component 103 can be alleviated, thereby improving the smoothness and reliability of the connection between the current collecting component 103 and the pole cover 4. In addition, since the connecting portion 41 connecting the pole cover 4 to the pole body 3 is separated from the side groove wall of the recess 31 near the abutting portion 32, the assembly clearance requirement between the pole cover 4 and the pole body 3 can be reduced, the processing accuracy requirement of the pole cover 4 can be reduced, and the compatibility of the pole body 3 can be increased.

[0123] In some embodiments of the present application, the connecting portion 41 is welded to the portion of the pole body 3 located on the side of the recess 31 close to the accommodating cavity 11. Thus, by welding the connecting portion 41 to the pole body 3, the connection reliability between the pole body 3 and the pole cover 4 can be improved, and other connection components can be omitted, thereby simplifying the structure and reducing costs.

[0124] It is worth noting that if the pole cover plate is welded to the side of the sink trough near the abutment to form a molten pool, the shrinkage stress generated by the solidification of the molten pool will be directly transmitted to the abutment. Since the solidification shrinkage stress on the side of the molten pool away from the accommodating cavity is greater, it is easy to cause the abutment to warp. Moreover, if the pole cover plate needs to be welded to the side of the sink trough near the abutment, it is necessary to ensure that the assembly gap between the pole cover plate and the pole body meets the welding requirements, resulting in poor compatibility of the pole body and high processing precision requirements for the pole body and the pole cover plate.

[0125] In the embodiment of the present application, the connecting portion 41 is welded to the portion of the pole body 3 located on the side of the sink 31 near the accommodating cavity 11, and after the molten pool formed and solidified, the connecting portion 41 is separated from the side wall of the sink 31 near the abutting portion 32. This prevents the shrinkage stress generated by the solidification of the molten pool from being transmitted to the abutting portion 32, thereby alleviating the warping problem of the abutting portion 32. Furthermore, since the connecting portion 41 is penetrated and welded to the bottom wall 312 rather than butt-welded to the side wall 311, there is no need to ensure an assembly gap between the connecting portion 41 and the side wall 311 to meet butt welding requirements. This allows for a larger gap between the connecting portion 41 and the side wall 311, thereby improving the compatibility of the pole body 3 and facilitating the reduction of the machining accuracy of the pole cover 4 and the pole body 3.

[0126] In some embodiments of the present application, with reference to Figures 6 and 7 , the edge of the pole cover 4 is formed as a connecting portion 41, that is, the connecting portion 41 is located at the edge of the pole cover 4. Therefore, when the connecting portion 41 is used to connect to the pole body 3, the pole cover 4 does not have a groove wall located on one side of the outer portion of the connecting portion 41 near the recessed groove 31 and near the abutting portion 32, thereby further improving the problem of the force generated by the connection between the pole cover 4 and the pole body 3 being transmitted to the abutting portion 32, causing the abutting portion 32 to tilt.

[0127] In some embodiments of the present application, with reference to Figures 6 and 7 , the pole body 3 includes a penetration portion 33 that penetrates the mounting hole 12, and at least a portion of the connecting portion 41 is disposed on and connected to the penetration portion 33. With the axial direction of the mounting hole 12 as the projection direction and a plane perpendicular to the axial direction of the mounting hole 12 as the projection plane, the projection of the penetration portion 33 on the projection plane falls within the projection range of the mounting hole 12 on the projection plane, and a surface of the penetration portion 33 on a side away from the accommodating cavity 11 defines at least a portion of the bottom wall 312 of the recess 31.

[0128] Thus, by arranging at least a portion of the connecting portion 41 on the penetration portion 33 and connecting to the penetration portion 33, since the penetration portion 33 is penetrated by the mounting hole 12, the penetration portion 33 can have a relatively sufficient size in the axial direction of the mounting hole 12 to connect to the connecting portion 41, which can help improve the connection reliability between the pole body 3 and the pole cover 4. For example, when the connecting portion 41 and the penetration portion 33 are welded, they can have sufficient penetration depth, thereby improving the welding reliability of the two. For another example, when the penetration portion 33 and the connecting portion 41 are connected by a fastener, the depth of the fastener extending into the penetration portion 33 is sufficient, thereby improving the connection reliability of the pole body 3 and the pole cover 4. Moreover, since the connection position of the connecting portion 41 and the penetration portion 33 is close to the mounting hole 12, it can be relatively far away from the position where the abutting portion 32 abuts against the housing 1, thereby further improving the problem of the abutting portion 32 tilting.

[0129] In some embodiments of the present application, with reference to FIG7 , the penetration portion 33 is formed in an annular shape, and the radial width D2 of the connection portion 41 covering the pole body 3 is smaller than the radial wall thickness D1 of the penetration portion 33. The radial wall thickness D1 is the radial wall thickness of the penetration portion 33 at the end away from the accommodating cavity 11, and the radial width D2 is the width of the connection portion 41 on one side of the penetration portion 33 along the radial direction of the penetration portion 33. Thus, when the penetration portion 33 is annular, by setting the radial width D2 of the connection portion 41 covering the pole body 3 to be smaller than the radial wall thickness D1 of the penetration portion 33, the radial wall thickness of the penetration portion 33 is sufficient to support and connect with the connection portion 41, thereby improving the connection reliability between the pole body 3 and the pole cover 4. For example, when the connection portion 41 and the penetration portion 33 are welded, the connection portion 41 can be welded only to the penetration portion 33, leaving a sufficient weld width at the connection, thereby improving the welding reliability between the two.

[0130] Of course, the present application is not limited to this. For example, in other embodiments of the present application, when the penetration portion 33 is formed in an annular shape, the radial dimension D2 of the connecting portion 41 covering the penetration portion 33 may also be greater than the radial wall thickness D1 of the penetration portion 33. In this case, only a portion of the connecting portion 41 is provided on the penetration portion 33, and this portion is connected to the penetration portion 33. At the same time, a portion of the connecting portion 41 may also extend to a side of the penetration portion 33 away from the central axis L of the mounting hole 12 and be connected to this portion of the pole body 3. In this case, the surface of the side of the penetration portion 33 away from the accommodating cavity 11 defines a portion of the bottom wall 312 of the recess 31, and the remaining portion of the bottom wall 312 of the recess 31 is defined by other structures of the pole body 3.

[0131] For example, in some other embodiments, the pole body 3 also includes a connecting portion (not shown) connected between the supporting portion 32 and the penetration portion 33, and the connecting portion also abuts against the outer wall surface of the shell 1. The connecting portion and the penetration portion 33 jointly define the bottom wall 312 of the sinking groove 31, and the connecting portion 41 is arranged on the connecting portion and the penetration portion 33, and is welded to the connecting portion and the penetration portion 33 respectively.

[0132] In some embodiments of the present application, with reference to FIG7 , the abutting portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The abutting portion 32 protrudes from the penetration portion 33 in a direction away from the accommodating cavity 11 (i.e., a side surface of the abutting portion 32 away from the accommodating cavity 11 protrudes relative to a side surface of the penetration portion 33 away from the accommodating cavity 11, or in short, an outer surface of the abutting portion 32 protrudes outwardly relative to an outer surface of the penetration portion 33), thereby defining a recessed groove 31 between a surface of the abutting portion 32 near the central axis L of the mounting hole 12 and a surface of the penetration portion 33 away from the accommodating cavity 11. In this case, the sidewall 311 of the recessed groove 31 can be defined by a side surface of the abutting portion 32 near the central axis L of the mounting hole 12, and the bottom wall 312 of the recessed groove 31 can be defined by a side surface of the penetration portion 33 away from the accommodating cavity 11.

[0133] Thus, the countersunk groove 31 is defined by the abutting portion 32 and the penetrating portion 33, simplifying the structure of the pole body 3 and making the penetrating groove 31 easier to design and manufacture. Furthermore, compared to the solution of "forming the penetrating groove 31 by partially recessing the surface of the penetrating portion 33 on the side away from the accommodating cavity 11," the radial outer boundary of the penetrating groove 31 can extend away from the central axis L of the mounting hole 12, facilitating mating with the connecting portion 41 of the pole cover 4 and facilitating the spacing between the sidewall 311 of the penetrating groove 31 and the connecting portion 41.

[0134] In some embodiments, as shown in FIG7 , the depth H3 of the recess 31 in the axial direction of the mounting hole 12 is one-third to two-thirds the thickness H1 of the abutting portion 32 in the axial direction of the mounting hole 12. That is, H3 is 1 / 3 to 2 / 3 times H1. This prevents the recess 31 from being too deep, ensuring sufficient wall thickness at the connection point between the abutting portion 32 and the penetration portion 33, thereby enhancing the structural strength of the weak points of the pole body 3. Furthermore, the recess 31 is not too shallow, allowing the connecting portion 41 to be largely accommodated within the recess 31, thereby reducing the volume of the connecting portion 41 protruding outside the recess 31 and improving the interference caused by the protruding connecting portion 41 during the assembly and connection of the conduit component 103.

[0135] In some embodiments of the present application, as shown in Figures 7 and 8, when the axial depth H3 of the groove 31 in the mounting hole 12 is less than the axial thickness H1 of the supporting portion 32 in the mounting hole 12, if the axial thickness H2 of the connecting portion 41 in the mounting hole 12 is close to the axial depth H3 of the groove 31 in the mounting hole 12, the connecting portion 41 can be basically received in the groove 31 to reduce the interference effect on the assembly of the conduit component 103 caused by the connecting portion 41 protruding from the outer surface of the supporting portion 32.

[0136] In some embodiments, when the penetration portion 33 is formed into an annular shape, the side of the sink 31 near the central axis L of the mounting hole 12 can be open to communicate with the inner ring area of ​​the penetration portion 33. Therefore, when the penetration portion 33 is formed into an annular shape, opening the side of the sink 31 near the central axis L of the mounting hole 12 to communicate with the inner ring area of ​​the penetration portion 33 can further simplify the design and processing of the sink 31. Compared to the solution of "when the penetration portion 33 is formed into an annular shape, the side of the sink 31 near the central axis L of the mounting hole 12 is closed", the radial inner boundary of the sink 31 can extend in the direction near the central axis L of the mounting hole 12, which facilitates cooperation with the pole cover 4 and helps to simplify the structural design of the pole cover 4.

[0137] In some embodiments, as shown in Figure 7, the supporting portion 32 includes a first segment 321 (for example, the portion on the right side of the auxiliary line L1 shown in Figure 7) and a second segment 322 (for example, the portion on the left side of the auxiliary line L1 shown in Figure 7) arranged in sequence along the direction away from the penetration portion 33. The surface perpendicular to the axial direction of the mounting hole 12 is used as the projection surface, and the axial direction of the mounting hole 12 is used as the projection direction. The projection of the first segment 321 on the projection surface is located within the projection of the mounting hole 12 on the projection surface, and the projection of the second segment 322 on the projection surface is located outside the projection of the mounting hole 12 on the projection surface.

[0138] Thus, the second section 322 can be abutted against the shell 1 to meet the abutting and matching requirements of the pole body 3 and the shell 1. Moreover, since there is a first section 321 between the second section 322 and the recessed groove 31 that is not used to abut against the shell 1, the first section 321 is used to define the groove side wall 311 of the recessed groove 31, thereby improving the problem of the second section 322 tilting due to the connection between the connecting portion 41 and the penetrating portion 33, which is beneficial to improving the reliability of the abutting and matching between the abutting portion 32 and the shell 1.

[0139] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the supporting portion 32 can also be arranged so that the projection on the projection surface is entirely located outside the projection of the mounting hole 12 on the projection surface. At this time, the supporting portion 32 and the penetration portion 33 can be connected through a connecting portion (not shown in the figure). At this time, the supporting portion 32 still defines the groove side wall 311 of the sinking groove 31, but the connecting portion and the penetration portion 33 jointly define the groove bottom wall 312 of the sinking groove 31. The connecting portion 41 is arranged on the connecting portion and the penetration portion 33, and is welded to the connecting portion and the penetration portion 33 respectively.

[0140] In some embodiments of the present application, as shown in FIG7 , the pole body 3 is formed with a supporting portion 32 by flanging and riveting. That is, after the pole body 3 is assembled to the mounting hole 12, the flanging and riveting process is adopted to produce the supporting portion 32. As a result, the pole body 3 is easy to process, and the sinking groove 31 can be obtained relatively easily. Moreover, when the supporting portion 32 is connected to the penetration portion 33, it is beneficial to improve the connection reliability of the supporting portion 32 and the penetration portion 33, and improve the assembly reliability of the pole body 3 and the housing 1. Of course, the present application is not limited to this. For example, in other embodiments of the present application, the pole body 3 can also be formed by welding two parts together, for example, the two parts are respectively assembled to the mounting hole 12, and then the two parts are welded together.

[0141] In some embodiments of the present application, as shown in FIG7 , the spacing between the connecting portion 41 and the sidewall of the recessed groove 31 near the abutting portion 32 gradually increases in a direction away from the accommodating cavity 11 (e.g., from bottom to top as shown in FIG7 ). Thus, since the spacing between the connecting portion 41 and the sidewall 311 of the recessed groove 31 gradually increases in a direction away from the accommodating cavity 11, this facilitates assembly of the connecting portion 41 into the recessed groove 31. Furthermore, at locations where the spacing is larger, corresponding to locations where the weld pool experiences greater solidification shrinkage and deformation, a larger spacing further reduces the warping of the abutting portion 32. Furthermore, at locations where the spacing is smaller, the structural strength of the pole body 3 is enhanced at locations where the wall thickness is smaller due to the recessed groove. It is understood that when the connecting portion 41 and the penetrating portion 33 are welded to form a molten pool, the shrinkage stress at the end of the molten pool away from the accommodating cavity 11 is greater. Therefore, a larger spacing at this location can help reduce the warping of the abutting portion 32 caused by heat and shrinkage stress at this location.

[0142] In some embodiments of the present application, as shown in FIG7 , the cross-sectional area of ​​the sink 31 gradually increases in the direction away from the accommodating cavity 11 (for example, from bottom to top as shown in FIG7 ). Thus, the sink 31 is in a flared form, which is beneficial to the assembly of the connection portion 41 of the pole cover 4 and the sink 31, and improves the assembly efficiency of the pole cover 4 and the pole body 3. Moreover, when the sink 31 is in a flared form, it is beneficial to realize the design in which the distance between the connection portion 41 and the side wall of the sink 31 close to the abutting portion 32 gradually increases in the direction away from the accommodating cavity 11. It is worth noting that when the cross-sectional area of ​​the sink 31 gradually increases in the direction away from the accommodating cavity 11, the side wall 311 of the sink 31 can be a curved surface or an inclined surface, which can be specifically set according to actual conditions.

[0143] In some embodiments of the present application, as shown in FIG8 , the pole cover 4 includes a cover body 42, a connecting portion 41 is located at the edge of the cover body 42, and a side surface of the cover body 42 away from the accommodating cavity 11 protrudes from (i.e., protrudes in a direction away from the accommodating cavity 11) a side surface of the connecting portion 41 away from the accommodating cavity 11. For example, the upper surface of the cover body 42 shown in FIG8 protrudes upward relative to the upper surface of the connecting portion 41. In this way, the interference effect on the assembly of the convergence component 103 caused by the protrusion of the connecting portion 41 from the cover body 42 can be avoided, thereby improving the assembly convenience of the convergence component 103 and the connection reliability between the convergence component 103 and the pole cover 4.

[0144] For example, when the pole cover 4 is connected to the pole body 3 by welding, a sink can be set at the edge of the cover body 42 when processing the pole cover 4. When the part of the pole cover 4 where the sink is set is welded to the pole body 3, the excess height of the connection portion 41 formed by welding will not exceed the outer surface of the cover body 42, thereby avoiding the interference caused by the connection portion 41 protruding from the cover body 42 on the assembly of the convergence component 103, improving the assembly convenience of the convergence component 103 and the connection reliability between the convergence component 103 and the pole cover 4. It is worth noting that the sinking depth of the sink is not limited, for example, it can be about 0.2 mm, so that while avoiding the excess height of the weld, the thickness of the connection portion 41 can be ensured to be sufficient, thereby improving the connection reliability of the pole cover 4 and the pole body 3.

[0145] In some embodiments of the present application, as shown in FIG7 , the pole cover 4 includes a cover body 42, a connecting portion 41 is located at an edge of the cover body 42, and a side surface of the cover body 42 away from the accommodating cavity 11 protrudes in a direction away from the accommodating cavity 11 from a side surface of the supporting portion 32 away from the accommodating cavity 11. For example, the upper surface of the cover body 42 shown in FIG7 protrudes upward relative to the upper surface of the supporting portion 32. Thus, by setting the supporting portion 32 of the pole body 3 to be sunken relative to the cover body 42, the interference effect on the assembly of the confluence component 103 caused by the protrusion of the supporting portion 32 can be avoided, thereby improving the assembly convenience of the confluence component 103 and the connection reliability between the confluence component 103 and the pole cover 4.

[0146] In some embodiments, as shown in Figures 7 and 8 , the thickness H1 of the abutting portion 32 in the axial direction of the mounting hole 12 is greater than the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12. Therefore, since the thickness of the abutting portion 32 is greater than the thickness of the connecting portion 41, deformation of the abutting portion 32 is reduced, further alleviating the problem of warping of the abutting portion 32 caused by the connection between the connecting portion 41 and the pole body 3.

[0147] In some embodiments of the present application, as shown in Figures 7 and 8 , the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12 is three-quarters to five-quarters of the depth H3 of the recessed groove 31 in the axial direction of the mounting hole 12. That is, H2 is 3 / 4 to 5 / 4 times H3. As a result, the axial thickness H2 of the connecting portion 41 in the mounting hole 12 is close to the axial depth H3 of the recessed groove 31 in the mounting hole 12, allowing the connecting portion 41 to be substantially contained within the recessed groove 31, thereby minimizing interference with the assembly of the conduit component 103 caused by the connecting portion 41 protruding from the outer surface of the abutting portion 32.

[0148] In some embodiments of the present application, when the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12 is less than or equal to the depth H3 of the recessed groove 31 in the axial direction of the mounting hole 12, this helps avoid interference with the assembly of the current collecting component 103 caused by the protrusion of the connecting portion 41. For example, when the connecting portion 41 is welded to the pole body 3, the depth of the recessed groove 31 can avoid the excess height generated by the formation of the connecting portion 41, thereby helping avoid interference with the assembly of the current collecting component 103 caused by the protrusion of the connecting portion 41.

[0149] In some embodiments of the present application, as shown in Figures 9 and 10, the surface of the connecting portion 41 away from the accommodating cavity 11 intersects an acute angle with the cross section of the mounting hole 12. It is worth noting that when the connecting portion 41 is welded to the pole body 3, "the surface of the connecting portion 41 away from the accommodating cavity 11 intersects an acute angle with the cross section of the mounting hole 12" means that before the connecting portion 41 is welded to the pole body 3, the surface of the connecting portion 41 away from the accommodating cavity 11 intersects an acute angle with the cross section of the mounting hole 12.

[0150] Specifically, the surface of the connection portion 41 away from the accommodating cavity 11 is the outer surface 411 of the connection portion 41. The outer surface 411 of the connection portion 41 intersects the cross-section of the mounting hole 12 at an acute angle. Therefore, the outer surface 411 of the connection portion 41 is not parallel to the cross-section of the mounting hole 12, and the outer surface 411 of the connection portion 41 is not perpendicular to the axial direction of the mounting hole 12. In this way, when the laser welds the connection portion 41 and the pole body 3 along a direction parallel to the central axis L of the mounting hole 12, due to the aforementioned inclined setting of the outer surface 411 of the connection portion 41, the reflected laser light will not return to the laser along the axial direction of the mounting hole 12, thereby improving the problem of laser damage caused by laser return and having the effect of protecting the laser.

[0151] For example, when the connection portion 41 of the pole cover 4 is made of copper, when it is connected by laser irradiation, if the incident path of the laser is perpendicular to the surface to be connected, the reflection path of the laser is also perpendicular to the surface to be connected, which easily forms a high reflection of copper and damages the laser. The above embodiment of the present application sets the outer surface 411 of the connection portion 41 to be not perpendicular to the incident path of the laser, so that the reflection path of the laser deviates from the incident path of the laser, that is, the laser reflection path and the laser incident path form an angle, thereby avoiding the problem of reflected laser damaging the laser.

[0152] In some embodiments, as shown in FIG10 , the surface of the connection portion 41 away from the accommodating cavity 11 extends obliquely along a direction away from the central axis L of the mounting hole 12 toward the accommodating cavity 11. Thus, because the connection portion 41 is relatively thick near the cover body 42 and relatively thin near the sidewall 311 of the recessed groove 31, the processing and forming of the connection portion 41 of the pole cover 4 is facilitated, reducing material waste and lowering costs. Furthermore, because the connection portion 41 is relatively thick near the cover body 42 and relatively thin near the sidewall 311 of the recessed groove 31, the reliability of the connection portion 41 connecting the pole cover 4 and the pole body 3 can be improved.

[0153] Moreover, since the wall thickness of the pole cover 4 at the connecting portion 41 is reduced, it is helpful to avoid interference with the assembly of the convergence component 103 due to the connection between the connecting portion 41 and the pole body 3, such as the excess height formed by welding, the increase in height caused by bonding, or the protrusion of fasteners caused by the provision of fasteners, which may all cause interference with the assembly of the convergence component 103. By reducing the wall thickness at the connecting portion 41, the above problems can be improved, and the assembly smoothness and connection reliability of the convergence component 103 can be improved.

[0154] In addition, since the surface of the connecting portion 41 away from the accommodating cavity 11 extends obliquely along the direction away from the central axis L of the mounting hole 12 toward the accommodating cavity 11, the outer surface 411 of the connecting portion 41 intersects the cross-section of the mounting hole 12 at an acute angle. Therefore, when the connecting portion 41 is connected to the pole body 3 by laser welding, by setting the connecting portion 41 to the above-mentioned inclined form, the laser reflection path and the laser incident path can form an angle, thereby improving the problem of laser reflection damaging the laser and protecting the laser.

[0155] In addition, it is worth noting that when the outer surface 411 of the connecting portion 41 intersects the cross-section of the mounting hole 12 at an acute angle, in some embodiments, the outer surface 411 of the connecting portion 41 can also be configured to extend obliquely in the direction away from the central axis L of the mounting hole 12 and away from the accommodating cavity 11.

[0156] In some embodiments of the present application, as shown in Figures 6 and 7, the pole body 3 includes a penetration portion 33 penetrated through the mounting hole 12, the supporting portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12, and the battery cell 102 also includes an insulating sealing structure 8 for insulating and sealing the shell 1 and the pole body 3, and the insulating sealing structure 8 includes a portion provided between the penetration portion 33 and the shell 1 and a portion provided between the supporting portion 32 and the shell 1.

[0157] Thus, by providing the insulating sealing structure 8, the pole body 3 is indirectly in contact with the housing 1, so that the housing 1 and the pole body 3 are insulated and sealed. This eliminates the need to design the housing 1 or the pole body 3 as a complex composite structure for insulation and sealing, thereby simplifying the design and processing of the housing 1 and the pole body 3. Furthermore, because the insulating sealing structure 8 includes both a portion provided between the penetration portion 33 and the housing 1 and a portion provided between the abutting portion 32 and the housing 1, the stability of the insulating sealing structure 8 and the adequacy of the insulating seal can be improved, thereby improving the reliability of the insulating sealing effect of the insulating sealing structure 8.

[0158] It is worth noting that the insulating sealing structure 8 can be one piece or multiple pieces. When it is one piece, one piece can be of the same material or a combination of multiple materials. When it is composed of multiple pieces, the materials of the multiple pieces can be the same or different, and any one of the multiple pieces can be of the same material or a combination of multiple materials. All can be flexibly set and there is no restriction here.

[0159] In some embodiments of the present application, as shown in FIG7 , the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 disposed toward the housing 1 , the corner of the housing 1 disposed near the first corner 34 is a second corner 131 , the insulating sealing structure 8 includes a third corner 81 disposed corresponding to the first corner 34 , and a fourth corner 82 disposed corresponding to the second corner 131 , and at least one of the first corner 34 , the second corner 131 , the third corner 81 , and the fourth corner 82 is formed as a chamfer. The chamfer may be a rounded corner or a chamfered corner, which is not limited here.

[0160] Therefore, by using chamfers instead of right angles, the force-bearing area or force-applying area can be increased, local pressure and stress concentration can be reduced, the risk of cracking of the insulating sealing structure 8 at the third corner 81 or the fourth corner 82, which are prone to cracking, can be reduced, the structural stability of the insulating sealing structure 8 can be improved, and the reliability of the insulating sealing structure 8 in achieving the insulating sealing effect can be improved.

[0161] For example, when the pole body 3 is assembled and fixed to the shell 1, the first corner 34 is likely to squeeze the third corner 81, causing the insulating sealing structure 8 to crack from the position of the third corner 81. If the first corner 34 is set to a chamfered form, the area where the first corner 34 applies force to the third corner 81 can be increased, so that the force application position is dispersed, thereby reducing the force concentration on the position of the third corner 81 and reducing the risk of the insulating sealing structure 8 cracking from the position of the third corner 81; if the third corner 81 is set to a chamfered form, when the first corner 34 applies force to the third corner 81, the force area of ​​the third corner 81 can be increased, so that the force at the position of the third corner 81 is dispersed, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the third corner 81.

[0162] For example, when the pole body 3 is assembled and fixed to the shell 1, the second corner 131 easily squeezes the fourth corner 82, causing the insulating sealing structure 8 to crack from the position of the fourth corner 82. If the second corner 131 is set to a chamfered form, the area where the second corner 131 applies force to the fourth corner 82 can be increased, so that the force application position is dispersed, thereby reducing the force concentration on the position of the fourth corner 82, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the fourth corner 82; if the fourth corner 82 is set to a chamfered form, when the second corner 131 applies force to the fourth corner 82, the force area of ​​the fourth corner 82 can be increased, so that the force at the position of the fourth corner 82 is dispersed, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the fourth corner 82.

[0163] It is worth noting that when the insulating sealing structure 8 is formed as an annular structure surrounding the central axis L of the mounting hole 12, and when the third corner 81 is chamfered, the third corner 81 can be chamfered along the entire circumference of the insulating sealing structure 8, or can be chamfered at a portion of the circumference of the insulating sealing structure 8, with the remaining positions being right angles. In addition, the chamfered shapes of the third corner 81 at different positions along the circumference of the insulating sealing structure 8 can be the same or different. For example, the third corner 81 can be rounded at some positions along the circumference of the insulating sealing structure 8 and chamfered at other positions.

[0164] Similarly, when the fourth corner 82 is chamfered, the fourth corner 82 can be chamfered along the entire circumference of the insulating sealing structure 8, or it can be chamfered at a portion of the circumference of the insulating sealing structure 8, with the remaining positions being right angles. In addition, the chamfered shapes of the fourth corner 82 at different positions along the circumference of the insulating sealing structure 8 can be the same or different. For example, the fourth corner 82 can be rounded at some positions along the circumference of the insulating sealing structure 8 and chamfered at the remaining positions.

[0165] In some embodiments of the present application, as shown in Figure 7, regardless of whether at least one of the first corner 34 and the third corner 81 is processed into a chamfered form, the first corner 34 and the third corner 81 can be set to have a fitting gap. In this way, the extrusion of the first corner 34 on the third corner 81 can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the third corner 81.

[0166] In some embodiments of the present application, as shown in Figure 7, regardless of whether at least one of the second corner 131 and the fourth corner 82 is processed into a chamfered form, the second corner 131 and the fourth corner 82 can be set to have a fitting gap. In this way, the extrusion of the second corner 131 on the fourth corner 82 can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the fourth corner 82.

[0167] In some embodiments of the present application, as shown in FIG7 , the first corner 34 and the third corner 81 are chamfered corners with matching shapes, that is, the first corner 34 and the third corner 81 are both chamfered corners or both rounded corners. This facilitates processing and facilitates achieving surface contact between the two, or helps improve the uniformity of the fitting gap between the two, thereby helping to reduce the squeezing of the first corner 34 on the third corner 81, thereby reducing the risk of cracking of the insulating sealing structure 8 at the position of the third corner 81. Of course, the present application is not limited to this, for example, the first corner 34 and the third corner 81 can also be set to have mismatched shapes.

[0168] For example, as shown in Figure 7, the first corner 34 and the third corner 81 are both chamfered corners, and the chamfer radius of the first corner 34 is smaller than the chamfer radius of the third corner 81, which is beneficial to increase the fitting clearance between the first corner 34 and the third corner 81 while improving the compactness of the fitting, reduce the extrusion of the first corner 34 on the third corner 81, and thus reduce the risk of cracking of the insulating sealing structure 8 from the position of the third corner 81.

[0169] In some embodiments of the present application, as shown in FIG7 , the second corner 131 and the fourth corner 82 are chamfers of matching shapes, that is, the second corner 131 and the fourth corner 82 are both chamfered or rounded. This facilitates processing and facilitates surface contact between the two, or helps improve the uniformity of the fit gap between the two, thereby helping to reduce the squeezing of the second corner 131 on the fourth corner 82, thereby reducing the risk of cracking of the insulating sealing structure 8 at the position of the fourth corner 82. Of course, the present application is not limited to this, for example, the second corner 131 and the fourth corner 82 can also be set to have mismatched shapes.

[0170] For example, as shown in FIG7 , the third corner 81 and the fourth corner 82 are both chamfered. When the third corner 81 is rounded, the fourth corner 82 is beveled. This allows the wall thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 to be sufficient, thereby improving the insulating sealing reliability of the insulating sealing structure 8. Alternatively, the fourth corner 82 can be rounded while the third corner 81 can be beveled.

[0171] In some embodiments of the present application, as shown in Figure 11, the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 set toward the shell 1, and the corner of the shell 1 set close to the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a first part 83 and a second part 84. The material hardness of the first part 83 is less than the material hardness of the second part 84. The first part 83 is set relative to the second part 84 close to at least one of the first corner 34 and the second corner 131.

[0172] For example, in combination with Figures 11 and 12, the first part 83 may include at least one of a first sub-part 831 and a second sub-part 832. In combination with Figure 11, the first sub-part 831 is arranged near the first corner 34 relative to the second part 84, and the material hardness of the first sub-part 831 is less than the material hardness of the second part 84. In combination with Figure 12, the second sub-part 832 is arranged near the second corner 131 relative to the second part 84, and the material hardness of the second sub-part 832 is less than the material hardness of the second part 84.

[0173] In this way, when the pole body 3 is assembled and fixed to the shell 1, the position corresponding to the first corner 34 of the insulating sealing structure 8 is prone to cracking. This place is set to the first sub-section 831 with a relatively soft material hardness. The first sub-section 831 is easily compressed and deformed by force and absorbs the force, thereby reducing the risk of cracking here; or, the position corresponding to the second corner 131 of the insulating sealing structure 8 is prone to cracking. This place is set to the second sub-section 832 with a relatively soft material hardness. The second sub-section 832 is easily compressed and deformed by force and absorbs the force, thereby reducing the risk of cracking here.

[0174] It is worth noting that the materials of the first portion 83 and the second portion 84 are not limited and can be selected according to actual requirements. For example, the material of the second portion 84 can be selected to be an insulating material with higher hardness, such as PPS (i.e., polyphenylene sulfide, a new high-performance thermoplastic resin) or LCP (i.e., liquid crystal polymer), so that the second portion 84 has better hardness and plays a supporting role, so that the compression of the insulating sealing material can be better controlled, thereby improving the sealing performance. The material of the first portion 83 can be selected to be a compressible rubber material or plastic material, such as PFA (i.e., perfluoroalkyl), PP (i.e., polypropylene), FKM (i.e., fluororubber), or EPDM (i.e., ethylene propylene diene monomer), so that the first portion 83 has better compression deformation performance and can more effectively improve the cracking problem. In addition, when the first portion 83 includes both the first sub-portion 831 and the second sub-portion 832, the materials of the first sub-portion 831 and the second sub-portion 832 can be the same or different, and can be specifically set according to actual conditions.

[0175] In some embodiments, as shown in FIG11 , the first portion 83 includes a first sub-portion 831 . The first sub-portion 831 is positioned relative to the second portion 84 near the first corner 34 . The first sub-portion 831 defines a portion of the surface of the insulating sealing structure 8 facing the abutting portion 32 and / or defines a portion of the surface of the insulating sealing structure 8 facing the penetration portion 33 . As a result, the first sub-portion 831 is exposed to the outer surface of the insulating sealing structure 8 near the first corner 34 , allowing for better compression deformation under load, which is more beneficial in alleviating cracking issues in this area. Furthermore, the difficulty of combining the first sub-portion 831 with the second portion 84 can be reduced.

[0176] In some embodiments, as shown in Figures 13 and 14, the end of the penetration portion 33 connected to the abutting portion 32 (for example, the upper end 331 of the penetration portion 33 shown in Figure 13) and the abutting portion 32 form a first pole portion 35, and the insulating sealing structure 8 includes a first insulating seal 85 fitted between the first pole portion 35 and the housing 1. A gasket 9 is provided between the first pole portion 35 and the housing 1 for buffering the force applied to the first insulating seal 85 by the first pole portion 35 and / or the housing 1. Thus, by providing the gasket 9, the force applied to the first insulating seal 85 by the first pole portion 35 and / or the reaction force applied to the first insulating seal 85 by the housing 1 can be reduced, thereby reducing damage to the first insulating seal 85, thereby protecting the first insulating seal 85 and improving the cracking problem of the first insulating seal 85.

[0177] It is worth noting that the location and buffering method of the gasket 9 are not limited, as long as the damage to the first insulating seal 85 can be reduced during the assembly of the pole body 3 to the shell 1. For example, in some embodiments, as shown in Figures 13 and 14, the gasket 9 can be arranged between the shell 1 and the first insulating seal 85, and / or between the first pole portion 35 and the first insulating seal 85. In other words, the gasket 9 can be arranged at least one of the positions between the shell 1 and the first insulating seal 85 and between the first pole portion 35 and the first insulating seal 85. As a result, the assembly of the gasket 9 is facilitated, the production difficulty is reduced, and the first insulating seal 85 can be made into an integral part, which facilitates the processing and assembly of the first insulating seal 85.

[0178] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the gasket 9 can also be set at other positions. For example, the first insulating seal 85 is set in a component form. At this time, the gasket 9 can be set between multiple components of the first insulating seal 85, and the material hardness of the gasket 9 is set to be less than the material hardness of the first insulating seal 85. When the force generated by the assembly of the pole body 3 and the shell 1 is applied to the first insulating seal 85, the gasket 9 can be compressed and deformed to absorb the force, thereby reducing the damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0179] In some embodiments, referring to FIG13 , the gasket 9 may include a first gasket 91, which is disposed between the abutting portion 32 and the first insulating seal 85. At this time, the material hardness of the first gasket 91 and the material hardness of the first insulating seal 85 are not limited. Thus, when the pole body 3 is installed on the housing 1, when the abutting portion 32 presses the first insulating seal 85 toward the housing 1 (for example, the first insulating seal 85 is pressed along the axial direction of the mounting hole 12), since the first gasket 91 is provided between the first insulating seal 85 and the abutting portion 32, the first gasket 91 can reduce a portion of the force, thereby reducing the force transmitted to the first insulating seal 85, thereby reducing damage to the first insulating seal 85, and protecting the first insulating seal 85.

[0180] In some embodiments, referring to FIG14 , the gasket 9 may include a second gasket 92, which is disposed between the penetration portion 33 and the first insulating seal 85. At this time, the material hardness of the second gasket 92 is not limited to the material hardness of the first insulating seal 85. Thus, when the pole body 3 is installed in the housing 1, when the penetration portion 33 presses the first insulating seal 85 in the direction of the housing 1 (for example, the first insulating seal 85 is pressed radially along the mounting hole 12), since the second gasket 92 is disposed between the first insulating seal 85 and the penetration portion 33, the second gasket 92 can reduce a portion of the force, thereby reducing the force transmitted to the first insulating seal 85, thereby reducing damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0181] In some embodiments, referring to FIG. 14 , the gasket 9 may include a third gasket 93 disposed between the first insulating seal 85 and the outer surface of the housing 1 , and the material hardness of the third gasket 93 is less than the material hardness of the first insulating seal 85. Thus, when the pole body 3 is mounted on the housing 1 , when the pole body 3 presses the first insulating seal 85 toward the housing 1 (e.g., presses the first insulating seal 85 along the axial direction of the mounting hole 12 ), the first insulating seal 85 can transmit the applied force to the third gasket 93. Since the material hardness of the third gasket 93 is relatively low, it can be compressed and deformed, absorbing the applied force, thereby reducing the reaction force fed back to the first insulating seal 85. This buffers the force applied to the first insulating seal 85 by the first pole portion 35 , reduces damage to the first insulating seal 85 , and protects the first insulating seal 85 .

[0182] In some embodiments, the gasket 9 may include at least two of the first gasket 91, the second gasket 92 and the third gasket 93, that is, the gasket 9 may include any two of the first gasket 91, the second gasket 92 and the third gasket 93, or may also include the first gasket 91, the second gasket 92 and the third gasket 93 at the same time, so as to protect the first insulating seal 85 from multiple angles and better reduce the damage caused by the first insulating seal 85.

[0183] In some embodiments, when the gasket 9 includes both a first gasket 91 and a second gasket 92, the first gasket 91 and the second gasket 92 can be made into an integral piece, thereby reducing the difficulty of installing and fixing the second gasket 92, and the first gasket 91 and the second gasket 92 can be installed together, thereby improving the overall assembly efficiency.

[0184] In some embodiments, when the gasket 9 does not include the second gasket 92, a fitting gap can be set between the first insulating seal 85 and the penetration portion 33. In this way, when the pole body 3 is installed to the shell 1, when the penetration portion 33 squeezes the first insulating seal 85 toward the shell 1 (for example, the first insulating seal 85 is squeezed along the radial direction of the mounting hole 12), since a fitting gap is set between the first insulating seal 85 and the penetration portion 33, the penetration portion 33 is not easily squeezed directly into the first insulating seal 85, thereby reducing the force transmitted to the first insulating seal 85, reducing damage to the first insulating seal 85, and protecting the first insulating seal 85.

[0185] It is worth noting that in the embodiment of the present application, in order to protect the first insulating seal 85 and prevent it from cracking due to stress, at least two of the above-mentioned measures of setting chamfers, distinguishing the materials of the first part 83 and the second part 84, and setting a gasket 9 can be adopted simultaneously, so as to better protect the first insulating seal 85 and improve its problems such as cracking and damage due to stress.

[0186] It is worth noting that the specific composition of the insulating sealing structure 8 is not limited. For example, in addition to the above-mentioned first insulating seal 85, it can also include other edge seals. In this way, by combining multiple insulating seals, it is possible to ensure the insulating and sealed connection between the pole body 3 and the shell 1 while taking into account other beneficial technical effects.

[0187] For example, in some embodiments, in combination with Figure 13, the pole body 3 also includes a flange portion 38 that is supported in the shell 1, the flange portion 38 is connected to the end of the penetration portion 33 close to the accommodating cavity 11, the supporting portion 32 is connected to the end of the penetration portion 33 away from the accommodating cavity 11, and the end of the penetration portion 33 connected to the flange portion 38 (for example, the lower end portion 332 of the penetration portion 33 shown in Figure 13) and the flange portion 38 form a second pole portion 39, and the insulating sealing structure 8 includes a second insulating seal 86 that is fitted between the second pole portion 39 and the shell 1.

[0188] For example, the material hardness of the first insulating seal 85 is greater than that of the second insulating seal 86, and the second insulating seal 86 is more easily compressed and deformed than the first insulating seal 85, thereby providing a better sealing effect. However, the first insulating seal 85 has a stronger heat resistance than the second insulating seal 86. For example, the first insulating seal 85 is a plastic component, while the second insulating seal 86 is a rubber component. As a result, when the pole body 3 and the pole cover 4 are welded, the thermal impact on the second insulating seal 86 can be minimized, thereby improving the sealing reliability between the housing 1 and the pole body 3. It is understandable that when the supporting portion 32 is tilted, the amount of compression of the second insulating seal 86 by the flange portion 38 becomes insufficient, affecting the sealing reliability.

[0189] In addition, in some embodiments, in conjunction with FIG13 , the insulating sealing structure 8 may further include a third insulating seal 87. The third insulating seal 87 may be provided between the flange portion 38 and the housing 1 and abut the active material coating portion 71 of the cell assembly 7, thereby not only improving the insulation between the cell assembly 7 and the housing 1, but also improving the stability of the fit between the cell assembly 7 and the housing 1, thereby improving the reliability of the battery cell 102. Alternatively, the third insulating seal 87 may be eliminated, and an insulating bracket (not shown) may be provided at the end of the active material coating portion 71. The insulating bracket abuts the inner wall of the housing 1, thereby facilitating protection of the cell assembly 7 when the cell assembly 7 is installed in the housing 1, preventing the housing 1 from scratching the cell assembly 7, and improving the insulation between the cell assembly 7 and the housing 1. At the same time, it may improve the stability of the fit between the cell assembly 7 and the housing 1, thereby improving the reliability of the battery cell 102.

[0190] In some embodiments, as shown in FIG15 , a receiving groove 36 is formed on the pole body 3 and is open in a direction away from the receiving cavity 11, that is, the notch of the receiving groove 36 is formed on a side surface of the pole body 3 away from the receiving cavity 11, the sink 31 is arranged around the receiving groove 36 and is connected to the receiving groove 36, and the pole body 3 has a connecting hole 37, which passes through the groove wall of the receiving groove 36 on one side close to the receiving cavity 11 and connects the receiving cavity 11 with the receiving groove 36.

[0191] Thus, when the electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving groove 36 and then flow toward the receiving cavity 11 through the connecting hole 37, wherein the receiving groove 36 can play the role of buffering the electrolyte to improve the problems of electrolyte splashing, overflowing, etc. Moreover, the side wall of the receiving groove 36 (that is, the groove wall extending from the notch of the receiving groove 36 toward the receiving cavity 11) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell 1, there is no need to perform special processing on the shell 1, which is conducive to reducing the structural complexity and processing difficulty of the shell 1.

[0192] Exemplarily, as shown in Figure 15, the pole body 3 includes a penetration portion 33 that is penetrated by the mounting hole 12, and the penetration portion 33 is formed in a ring shape, and the accommodating groove 36 is located in the inner ring area of ​​the penetration portion 33. For example, the accommodating groove 36 can be jointly defined by the penetration portion 33 and the supporting portion located in the inner ring area of ​​the penetration portion 33. When the side of the sinking groove 31 close to the central axis L of the mounting hole 12 is open, the sinking groove 31 can be connected with the inner ring area of ​​the penetration portion 33, that is, connected with the accommodating groove 36. Therefore, when the pole cover 4 is covered on the pole body 3, the compactness of the fit between the pole cover 4 and the pole body 3 can be improved, and the cover body 42 of the pole cover 4 and the connecting part 41 do not need to be connected through a concave-convex structure, and the cover body 42 can be embedded in the accommodating groove 36, thereby improving the compactness of the fit between the pole body 3 and the pole cover 4, and improving the connection reliability of the cover body 42 of the pole cover 4 and the connecting part 41, and simplifying the structure of the pole cover 4.

[0193] In some embodiments, as shown in Figure 15, the battery cell 102 includes a battery cell assembly 7, the battery cell assembly 7 includes an active material coating portion 71 received in the accommodating cavity 11, and a conductive portion 72 connected to the active material coating portion 71, and the conductive portion 72 is passed through the connecting hole 37 to be at least partially received in the accommodating groove 36.

[0194] It is worth noting that there may be one or more communicating holes 37, and the conductive portion 72 may be provided through at least one of the communicating holes 37. For example, at least one communicating hole 37 is capable of passing electrolyte. For example, at least one communicating hole 37 is left vacant (i.e., not provided with the conductive portion 72), thereby enabling electrolyte to pass through without being obstructed by the conductive portion 72. For another example, at least one communicating hole 37 is still capable of passing electrolyte after being provided with the conductive portion 72.

[0195] Therefore, by accommodating at least a portion of the conductive part 72 in the receiving groove 36, at least a portion of the conductive part 72 occupies the space in the receiving groove 36, thereby reducing the space occupied by the conductive part 72 in the receiving cavity 11, saving space in the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, thereby facilitating the improvement of the energy density of the battery cell 102, or reducing the size of the battery cell 102 when the energy density of the battery cell 102 remains unchanged.

[0196] It is understandable that the active material coating portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only the pole ear portion, or may include the pole ear portion and an adapter electrically connected to the pole ear portion, etc., which is not limited here.

[0197] In some embodiments, the conductive portion 72 is welded to the pole body 3 to form an electrical connection, thereby enabling the battery cell assembly 7 to output from the electrode at the pole body 3. For example, as shown in FIG15 , the conductive portion 72 is welded to the side wall of the accommodating groove 36 close to the accommodating cavity 11, thereby improving the compactness of the fit and facilitating the welding operation between the two. Of course, the present application is not limited to this. In other embodiments, the conductive portion 72 can also be configured to be welded to the pole cover plate 4 to form an electrical connection, which is not limited here.

[0198] In some embodiments, as shown in Figures 15 and 16, an injection hole 43 is formed on the terminal cover plate 4, which can be connected to the receiving groove 36. The battery cell 102 also includes a sealing structure 6 for sealing the injection hole 43. In this way, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43 first, or the sealing structure 6 is in a state of opening the injection hole 43. At this time, the electrolyte can be injected into the receiving groove 36 through the injection hole 43. After the injection, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a state of closing the injection hole 43, thereby sealing and closing the injection hole 43 to prevent the electrolyte from overflowing and prevent foreign matter from entering the receiving cavity 11 through the injection hole 43, thereby improving the reliability of the battery cell 102.

[0199] Therefore, by processing the injection hole 43 on the pole cover 4, the opening is relatively small and located outside, and the injection inlet can be reliably sealed more easily through the sealing structure 6, thereby improving the working reliability of the battery cell 102 and realizing a flexible and diversified design of the sealing structure 6.

[0200] In some embodiments, as shown in Figures 15 and 16, the pole cover plate 4 does not have a portion that stops on the outside of the sealing structure 6 (i.e., the side away from the accommodating cavity 11), so that the sealing structure 6 is suitable for being installed on the pole cover plate 4 from the outside of the pole cover plate 4 (i.e., the side away from the accommodating cavity 11). In this way, by setting the sealing structure 6 to be installed on the pole cover plate 4 from the outside to seal the liquid injection hole 43, the sealing structure 6 can be installed after liquid injection, which can ensure the sealing of the liquid injection hole 43. The installation position is close to the outside, which facilitates the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 will not adversely affect the connection between the pole body 3 and the pole cover plate 4, thereby ensuring the reliability of the connection between the pole cover plate 4 and the pole body 3.

[0201] Among them, the sealing structure 6 can be in a detachable form or in a non-detachable fixed form. For example, as shown in Figure 17, when the sealing structure 6 is in a detachable form, it is convenient for the maintenance of the injection hole 43. For example, when the electrolyte needs to be replenished, the sealing structure 6 can be removed, the injection hole 43 can be opened, and the electrolyte can be replenished and injected into the accommodating cavity 11 through the injection hole 43. Then, the sealing structure 6 can be put back. For example, the sealing structure 6 can be detachably connected to the pole cover 4 by means of threads or screw buckles, thereby facilitating disassembly and assembly. For example, as shown in Figure 16, when the sealing structure 6 is in a non-detachable fixed form, the sealing structure 6 can be fixed to the pole cover 4 by means of welding, riveting, etc., thereby improving the sealing reliability of the sealing structure 6 to the injection hole 43.

[0202] In some embodiments of the present application, as shown in FIG16 , at least a portion of the sealing structure 6 is embedded in the liquid injection hole 43. That is, the sealing structure 6 can be entirely embedded in the liquid injection hole 43, or only a portion of the sealing structure 6 can be embedded in the liquid injection hole 43. Thus, on the one hand, the space within the liquid injection hole 43 can be fully utilized, thereby improving the sealing reliability of the sealing structure 6 on the liquid injection hole 43. On the other hand, the height of the sealing structure 6 protruding from the liquid injection hole 43 can be reduced, reducing the space occupied by the sealing structure 6 outside the pole cover 4, thereby reducing the interference effect on the confluence component 103, increasing the connection area between the confluence component 103 and the pole cover 4, and improving the flow efficiency.

[0203] In some embodiments of the present application, as shown in Figures 15 and 16 , the sealing structure 6 includes both a first sealing member 61 and a second sealing member 62. At least a portion of the first sealing member 61 is embedded in the liquid injection hole 43 and has an interference fit with the liquid injection hole 43 to seal the liquid injection hole 43. The second sealing member 62 is located on the side of the first sealing member 61 away from the accommodating cavity 11, and the edge of the second sealing member 62 is welded and sealed to the pole cover plate 4. Thus, the first sealing member 61 can effectively seal the liquid injection hole 43, and the second sealing member 62 can not only seal the liquid injection hole 43 but also prevent the first sealing member 61 from escaping from the liquid injection hole 43, thereby improving the sealing reliability of the sealing structure 6 on the liquid injection hole 43.

[0204] Illustratively, the first seal 61 can be made of plastic, rubber, or other materials, which facilitates an interference fit and improves sealing. Illustratively, the second seal 62 can be made of the same metal as the pole cover 4, such as aluminum, thereby improving the welding yield between the second seal 62 and the pole cover 4. Furthermore, it is worth noting that the welding method between the second seal 62 and the pole cover 4 is not limited, and for example, hot melt welding or brazing can be used. Illustratively, pulsed laser welding can be used to improve manufacturing efficiency and automation.

[0205] It is worth noting that laser welding has high requirements on the cleanliness of the injection hole 43. If there is residual electrolyte in the injection hole 43, the electrolyte will easily vaporize due to heat, and the waste gas generated by vaporization will rush out of the welding pool, causing defects such as pinholes and explosion points in the welding area. In some embodiments of the present application, with reference to FIG15 , the injection hole 43 includes a first hole segment 431, a second hole segment 432, and a third hole segment 433, sequentially arranged along the injection flow direction. The flow area of ​​the first hole segment 431 gradually decreases from the first hole segment 431 to the second hole segment 432. The flow area of ​​the second hole segment 432 gradually decreases from the second hole segment 432 to the third hole segment 433. The flow area of ​​the second hole segment 432 is equal to the flow area of ​​the inlet of the third hole segment 433. The third hole segment 433 is a hole segment of uniform cross-section. The first sealing member 61 has an interference fit with the third hole segment 433. This can alleviate the problem of liquid accumulation in the first and second hole segments 431, 432 of the injection hole 43, thereby improving the welding yield of the second sealing member 62 and the pole cover plate 4 and enhancing the sealing performance. Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the injection hole 43 may omit the third hole segment 433 and only include the first hole segment 431 and the second hole segment 432 , and so on.

[0206] Alternatively, in some embodiments, the second sealing member 62 may be configured to be detachably connected to the pole cover 4 by means of a screw-on fastener, so as to restrict the first sealing member 61 to a position where it is interference-fitted with the liquid injection hole 43 .

[0207] In some embodiments of the present application, as shown in FIG15 , the housing 1 includes a first housing wall 13, the mounting hole 12 is formed in the first housing wall 13, and the first housing wall 13 is an integrally formed cover plate. Alternatively, as shown in FIG6 , the housing 1 further includes a second housing wall 14, the first housing wall 13 and at least one second housing wall 14 are integrally formed, and the second housing wall 14 extends toward one side in the thickness direction of the first housing wall 13. Thus, flexible design of the structural position of the terminal 2 can be achieved, thereby increasing the applicability of the battery cell 102 of the embodiments of the present application.

[0208] It is worth noting that the second shell wall 14 can extend from an edge of the first shell wall 13. When the first shell wall 13 is rectangular, at least one of the four edges of the first shell wall 13 can extend into the second shell wall 14. For example, only one edge of the first shell wall 13 extends into the second shell wall 14. Alternatively, only two edges of the first shell wall 13 can extend into the second shell wall 14. Alternatively, three edges of the first shell wall 13 can extend into the second shell wall 14. Alternatively, all four edges of the first shell wall 13 can extend into the second shell wall 14. For example, when the housing 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 13.

[0209] For example, the shell 1 may include a shell body and a cover plate, the shell body defines a space open on one side, and the cover plate is arranged on the open side of the shell body to form a accommodating cavity 11 between the shell body and the cover plate. At this time, the wall surface of the shell body opposite to the cover plate is the first shell wall 13, and the wall surface of the shell body connected between the first shell wall 13 and the cover plate is the second shell wall 14, or, the wall surface of the shell body opposite to the cover plate is the second shell wall 14, and the wall surface of the shell body connected between the second shell wall 14 and the cover plate is the first shell wall 13, or, the cover plate is the first shell wall 13, either way.

[0210] According to the second embodiment of the present application, a battery cell 102 is proposed. The battery cell 102 may include: a shell 1, a pole body 3 and a pole cover 4. The shell 1 has a mounting hole 12, and an accommodating cavity 11 is defined in the shell 1. The pole body 3 includes a penetration portion 33 penetrated in the mounting hole 12 and a supporting portion 32 supported outside the shell 1. The supporting portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. A recessed groove 31 open in a direction away from the accommodating cavity 11 is formed between the supporting portion 32 and the penetration portion 33. The pole cover 4 is covered on the pole body 3. The edge of the pole cover 4 is arranged in the recessed groove 31 and is penetrated and welded to the penetration portion 33. The welding structure 5 formed by welding is spaced apart from the supporting portion 32.

[0211] For example, the edge of the pole cover 4 has a connecting portion 41, which is welded to the pole body 3 to form a welding structure 5. When the welding structure 5 is formed, the shrinkage stress generated by the solidification of the molten pool can be blocked by the spaced position and is difficult or less likely to be transmitted to the supporting portion 32, thereby improving the warping problem of the supporting portion 32.

[0212] It is worth noting that, unless there is any contradiction, the embodiments according to the first aspect of the present application can be combined with the embodiments according to the second aspect of the present application. For example, in the embodiments according to the second aspect of the present application, the following technical solutions can be combined, and the technical effects of the following technical solutions can refer to the description of the embodiments according to the first aspect above, so they will not be described in detail.

[0213] For example, in some embodiments, the penetration portion 33 is formed in a ring shape, and the maximum radial width of the welding structure 5 is smaller than the radial wall thickness D1 of the penetration portion 33 .

[0214] For example, in some embodiments, the depth H3 of the recess 31 in the axial direction of the mounting hole 12 is one third to two thirds of the thickness H1 of the supporting portion 32 in the axial direction of the mounting hole 12 .

[0215] For example, in some embodiments, the penetration portion 33 is formed in an annular shape, and one side of the recess 31 close to the central axis L of the mounting hole 12 is open to communicate with the inner annular area of ​​the penetration portion 33 .

[0216] For example, in some embodiments, the supporting portion 32 includes a first section 321 and a second section 322 arranged in sequence along a direction away from the penetrating portion 33, with a plane perpendicular to the axial direction of the mounting hole 12 as a projection plane, and the axial direction of the mounting hole 12 as a projection direction. The projection of the first section 321 on the projection plane is located within the projection of the mounting hole 12 on the projection plane, and the projection of the second section 322 on the projection plane is located outside the projection of the mounting hole 12 on the projection plane.

[0217] For example, in some embodiments, the pole body 3 is formed with the abutting portion 32 by flanging and riveting.

[0218] For example, in some embodiments, the distance between the welding structure 5 and the abutting portion 32 gradually increases in a direction away from the accommodating cavity 11 .

[0219] For example, in some embodiments, the cross-sectional area of ​​the sink 31 gradually increases in a direction away from the accommodating cavity 11 .

[0220] For example, in some embodiments, the pole cover 4 includes a cover body 42, and a connecting portion 41 is provided at the edge of the cover body 42. The connecting portion 41 is welded to the pole body 3 to form a welding structure 5. Before welding, the side surface of the cover body 42 away from the accommodating cavity 11 protrudes from the side surface of the connecting portion 41 away from the accommodating cavity 11 in the direction away from the accommodating cavity 11.

[0221] For example, in some embodiments, the thickness H1 of the supporting portion 32 in the axial direction of the mounting hole 12 is greater than the thickness of the welding structure 5 in the axial direction of the mounting hole 12 .

[0222] For example, in some embodiments, the thickness of the welding structure 5 in the axial direction of the mounting hole 12 is three-quarters to five-quarters of the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12 .

[0223] For example, in some embodiments, the pole cover 4 includes a cover body 42, and a connecting portion 41 is provided on the edge of the cover body 42. The connecting portion 41 is welded to the pole body 3 to form a welding structure 5. Before welding, the surface of the connecting portion 41 away from the accommodating cavity 11 extends obliquely along the direction away from the central axis L of the mounting hole 12 toward the direction close to the accommodating cavity 11.

[0224] For example, in some embodiments, the battery cell 102 also includes an insulating sealing structure 8 for insulating and sealing the shell 1 and the pole body 3. The insulating sealing structure 8 includes a portion arranged between the penetration portion 33 and the shell 1 and a portion arranged between the supporting portion 32 and the shell 1.

[0225] For example, in some embodiments, the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 set toward the shell 1, and the corner of the shell 1 close to the first corner 34 is the second corner 131. The insulating sealing structure 8 includes a third corner 81 set corresponding to the first corner 34, and a fourth corner 82 set corresponding to the second corner 131. At least one of the first corner 34, the second corner 131, the third corner 81 and the fourth corner 82 is formed as a chamfer.

[0226] For example, in some embodiments, the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 set toward the shell 1, and the corner of the shell 1 set close to the first corner 34 is the second corner 131. The insulating sealing structure 8 includes a third corner 81 set corresponding to the first corner 34, and a fourth corner 82 set corresponding to the second corner 131. There is a fitting gap between the first corner 34 and the third corner 81, and / or there is a fitting gap between the second corner 131 and the fourth corner 82.

[0227] For example, in some embodiments, the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 set toward the shell 1, and the corner of the shell 1 set close to the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a first part 83 and a second part 84. The material hardness of the first part 83 is less than the material hardness of the second part 84. The first part 83 is set relative to the second part 84 close to at least one of the first corner 34 and the second corner 131.

[0228] For example, in some embodiments, the first part 83 includes a first sub-part 831, which is arranged relative to the second part 84 near the first corner 34, and the first sub-part 831 defines a portion of the side surface of the insulating sealing structure 8 facing the supporting portion 32, and / or defines a portion of the side surface of the insulating sealing structure 8 facing the penetrating portion 33.

[0229] For example, in some embodiments, the end of the penetration portion 33 connected to the supporting portion 32 and the supporting portion 32 form a first pole portion 35, and the insulating sealing structure 8 includes a first insulating seal 85 fitted between the first pole portion 35 and the shell 1, and a gasket 9 is provided between the first pole portion 35 and the shell 1 for buffering the force applied by the first pole portion 35 to the first insulating seal 85.

[0230] For example, in some embodiments, the gasket 9 is disposed between the housing 1 and the first insulating seal 85 , and / or between the first pole portion 35 and the first insulating seal 85 .

[0231] For example, in some embodiments, the gasket 9 includes at least one of a first gasket 91, a second gasket 92 and a third gasket 93, the first gasket 91 is arranged between the supporting portion 32 and the first insulating seal 85, the second gasket 92 is arranged between the penetrating portion 33 and the first insulating seal 85, and the third gasket 93 is arranged between the first insulating seal 85 and the shell 1, and the material hardness of the third gasket 93 is less than the material hardness of the first insulating seal 85.

[0232] For example, in some embodiments, a receiving groove 36 is formed on the pole body 3, which is open in a direction away from the receiving cavity 11. The sink 31 is arranged around the receiving groove 36 and is connected to the receiving groove 36. The pole body 3 has a connecting hole 37, which passes through the groove wall of the receiving groove 36 on one side close to the receiving cavity 11 and connects the receiving cavity 11 with the receiving groove 36.

[0233] For example, in some embodiments, the battery cell 102 includes a cell assembly 7, which includes an active material coating portion 71 received in the accommodating cavity 11, and a conductive portion 72 connected to the active material coating portion 71, and the conductive portion 72 is passed through the connecting hole 37 to be at least partially received in the accommodating groove 36.

[0234] For example, in some embodiments, a liquid injection hole 43 that can communicate with the accommodating groove 36 is formed on the pole cover 4 , and the battery cell 102 further includes a sealing structure 6 for sealing the liquid injection hole 43 .

[0235] According to the third embodiment of the present application, a battery cell 102 is proposed. In conjunction with Figure 18, the battery cell 102 includes: a shell 1, a pole body 3 and a pole cover 4, the shell 1 has a mounting hole 12, the pole body 3 is passed through the mounting hole 12, and includes a supporting portion 32 that is supported on the outside of the shell 1, the pole cover 4 is covered on the pole body 3, and includes a connecting portion 41 connected to the pole body 3, with the surface perpendicular to the axial direction of the mounting hole 12 as the projection surface, and the axial direction of the mounting hole 12 as the projection direction, the projection of the part of the supporting portion 32 that is in contact with the shell 1 on the projection surface is separated from the projection of the connecting portion 41 on the projection surface.

[0236] It is worth noting that the part of the supporting portion 32 that abuts against the shell 1 refers to the part that the supporting portion 32 directly or indirectly contacts the shell 1. For example, the shell 1 includes a first shell wall 13, and the mounting hole 12 is formed on the first shell wall 13. The axial direction of the mounting hole 12 is used as the projection direction, and the surface perpendicular to the axial direction of the mounting hole 12 is used as the projection surface. The projection of the supporting portion 32 on the projection surface and the projection of the first shell wall 13 on the projection surface have an intersection area. The part of the supporting portion 32 corresponding to the intersection area is in direct or indirect contact with the shell 1, that is, the part of the supporting portion 32 that abuts against the shell 1.

[0237] It can be seen that, in the third embodiment of the present application, compared with the first and second embodiments described above, the recessed groove 31 may not be provided on the pole body 3. By setting the projection of the portion where the supporting portion 32 abuts against the shell 1 on the projection plane to be spaced apart from the projection of the connecting portion 41 on the projection plane, the force generated by the connection between the connecting portion 41 and the pole body 3 can be reduced and transmitted to the portion of the supporting portion 32 abutting against the shell 1, thereby improving the problem of the warping of the portion of the supporting portion 32 abutting against the shell 1.

[0238] It is worth noting that, ignoring the sink 31 and assuming no inconsistencies, the embodiment according to the first aspect of the present application can be combined with the embodiment according to the third aspect of the present application. For example, the embodiment according to the third aspect of the present application can be combined with the following technical solutions, and the technical effects of the following technical solutions can be referenced to the description of the embodiment according to the first aspect above, and therefore will not be elaborated on here.

[0239] For example, in some embodiments, the pole body 3 includes a penetration portion 33 that penetrates the mounting hole 12, the abutting portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12, a portion of the projection of the abutting portion 32 on the projection surface is located within the projection range of the mounting hole 12 on the projection surface, and thus, the remaining portion of the projection of the abutting portion 32 on the projection surface is located outside the projection range of the mounting hole 12 on the projection surface, so as to achieve abutment with the housing 1, the projection of the connecting portion 41 on the projection surface is located within the projection range of the penetration portion 33 on the projection surface, and the connecting portion 41 is provided on the penetration portion 33 and connected to the penetration portion 33. In this way, the connecting portion 41 can be further away from the portion of the abutting portion 32 that abuts the housing 1, thereby further improving the warping problem of the portion of the abutting portion 32 that abuts the housing 1.

[0240] For example, in some embodiments, the connecting portion 41 is welded to the penetration portion 33. Alternatively, in other embodiments, the connecting portion 41 and the penetration portion 33 may be connected by bonding or fasteners.

[0241] For example, in some embodiments, the edge of the pole cover 4 is formed as a connecting portion 41 .

[0242] For example, in some embodiments, the penetration portion 33 is formed in a ring shape, and the radial width D2 of the connecting portion 41 covering the pole body 3 is smaller than the radial wall thickness D1 of the penetration portion 33 .

[0243] For example, in some embodiments, the pole body 3 is formed with the abutting portion 32 by flanging and riveting.

[0244] For example, in some embodiments, the pole cover 4 includes a cover body 42, the connecting portion 41 is located at the edge of the cover body 42, and the side surface of the cover body 42 away from the accommodating cavity 11 protrudes from the side surface of the connecting portion 41 away from the accommodating cavity 11 in the direction away from the accommodating cavity 11.

[0245] For example, in some embodiments, the surface of the connecting portion 41 away from the accommodating cavity 11 extends obliquely along a direction away from the central axis L of the mounting hole 12 toward a direction close to the accommodating cavity 11 .

[0246] For example, in some embodiments, the battery cell 102 also includes an insulating sealing structure 8 for insulating and sealing the shell 1 and the pole body 3. The insulating sealing structure 8 includes a portion arranged between the penetration portion 33 and the shell 1 and a portion arranged between the supporting portion 32 and the shell 1.

[0247] For example, in some embodiments, the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 set toward the shell 1, and the corner of the shell 1 close to the first corner 34 is the second corner 131. The insulating sealing structure 8 includes a third corner 81 set corresponding to the first corner 34, and a fourth corner 82 set corresponding to the second corner 131. At least one of the first corner 34, the second corner 131, the third corner 81 and the fourth corner 82 is formed as a chamfer.

[0248] For example, in some embodiments, the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 set toward the shell 1, and the corner of the shell 1 set close to the first corner 34 is the second corner 131. The insulating sealing structure 8 includes a third corner 81 set corresponding to the first corner 34, and a fourth corner 82 set corresponding to the second corner 131. There is a fitting gap between the first corner 34 and the third corner 81, and / or there is a fitting gap between the second corner 131 and the fourth corner 82.

[0249] For example, in some embodiments, the connection between the supporting portion 32 and the penetrating portion 33 has a first corner 34 set toward the shell 1, and the corner of the shell 1 set close to the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a first part 83 and a second part 84. The material hardness of the first part 83 is less than the material hardness of the second part 84. The first part 83 is set relative to the second part 84 close to at least one of the first corner 34 and the second corner 131.

[0250] For example, in some embodiments, the first part 83 includes a first sub-part 831, which is arranged relative to the second part 84 near the first corner 34, and the first sub-part 831 defines a portion of the side surface of the insulating sealing structure 8 facing the supporting portion 32, and / or defines a portion of the side surface of the insulating sealing structure 8 facing the penetrating portion 33.

[0251] For example, in some embodiments, the end of the penetration portion 33 connected to the supporting portion 32 and the supporting portion 32 form a first pole portion 35, and the insulating sealing structure 8 includes a first insulating seal 85 fitted between the first pole portion 35 and the shell 1, and a gasket 9 is provided between the first pole portion 35 and the shell 1 for buffering the force applied by the first pole portion 35 to the first insulating seal 85.

[0252] For example, in some embodiments, the gasket 9 is disposed between the housing 1 and the first insulating seal 85 , and / or between the first pole portion 35 and the first insulating seal 85 .

[0253] For example, in some embodiments, the gasket 9 includes at least one of a first gasket 91, a second gasket 92 and a third gasket 93, the first gasket 91 is arranged between the supporting portion 32 and the first insulating seal 85, the second gasket 92 is arranged between the penetrating portion 33 and the first insulating seal 85, and the third gasket 93 is arranged between the first insulating seal 85 and the shell 1, and the material hardness of the third gasket 93 is less than the material hardness of the first insulating seal 85.

[0254] For example, in some embodiments, a receiving groove 36 is formed on the pole body 3, which is open in a direction away from the receiving cavity 11, and the supporting portion 32 is arranged around the receiving groove 36. The pole body 3 has a connecting hole 37, which passes through the groove wall of the receiving groove 36 on one side close to the receiving cavity 11 and connects the receiving cavity 11 with the receiving groove 36.

[0255] For example, in some embodiments, the battery cell 102 includes a cell assembly 7, which includes an active material coating portion 71 received in the accommodating cavity 11, and a conductive portion 72 connected to the active material coating portion 71, and the conductive portion 72 is passed through the connecting hole 37 to be at least partially received in the accommodating groove 36.

[0256] For example, in some embodiments, a liquid injection hole 43 that can communicate with the accommodating groove 36 is formed on the pole cover 4 , and the battery cell 102 further includes a sealing structure 6 for sealing the liquid injection hole 43 .

[0257] According to a fourth embodiment of the present application, a battery 100 is provided, comprising a battery cell 102 according to any of the above-described solutions. It is worth noting that the battery 100 according to the embodiment of the present application may or may not include a housing. As a result, the reliability of the battery cell 102 according to the embodiment of the present application is improved, thereby facilitating improved performance of the battery 100.

[0258] For example, as shown in FIG19 , the battery 100 may further include a busbar 103 , and there are multiple battery cells 102 , and at least two of them are electrically connected via the busbar 103 . Thus, multiple battery cells 102 can be connected in series and / or in parallel. For example, when multiple battery cells 102 are connected in series, the anode pole cover 4 of one battery cell 102 is connected to the cathode pole cover 4 of the next battery cell 102 via one busbar 103 , while the cathode pole cover 4 of the battery cell 102 is connected to the anode pole cover 4 of the previous battery cell 102 via another busbar 103 .

[0259] According to a fifth embodiment of the present application, an electrical device is provided, comprising a battery 100 according to any of the aforementioned solutions, wherein the battery 100 is configured to provide electrical energy to the electrical device. The electrical device may be any of the aforementioned devices or systems employing the battery 100. The improved performance of the battery 100 facilitates improved operating performance of the electrical device.

[0260] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0261] 3-8 , the battery cell 102 includes a housing 1, a terminal body 3, a terminal cover 4, and a cell assembly 7. The housing 1 has a mounting hole 12, which defines a receiving cavity 11. The terminal body 3 is disposed in the mounting hole 12 and includes a penetration portion 33 that penetrates the mounting hole 12 and a supporting portion 32 that abuts against the outside of the housing 1. The supporting portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The supporting portion 32 protrudes from the penetration portion 33 in a direction away from the receiving cavity 11, thereby defining a recess 31 between a surface of the supporting portion 32 that is adjacent to the central axis L of the mounting hole 12 and a surface of the penetration portion 33 that is distal to the receiving cavity 11. An insulating sealing structure 8 is provided between the housing 1 and the terminal body 3 to provide an insulated and sealed fit between the housing 1 and the terminal body 3.

[0262] 3 to 8 , the pole cover 4 is covered on the pole body 3 , and includes a cover body 42 and a connecting portion 41 . The connecting portion 41 is located at the edge of the cover body 42 . The connecting portion 41 is disposed on the penetration portion 33 and is welded to the penetration portion 33 . After welding, the connecting portion 41 can be formed into a solidified structure formed by solidification of the molten pool, and the solidified structure is spaced apart from the side wall of the sink 31 close to the abutting portion 32 .

[0263] In the embodiment of the present application, since the connecting portion 41 is welded to the penetration portion 33, and the connecting portion 41 forms a molten pool and is separated from the supporting portion 32 after solidification, the shrinkage stress generated by the solidification of the molten pool can be blocked, and is difficult or less likely to be transmitted to the supporting portion 32, thereby improving the warping problem of the supporting portion 32, and further improving the reliability of the support between the supporting portion 32 and the shell 1, so that the compression amount of the insulating sealing structure 8 can meet the requirements, and the sealing between the pole body 3 and the shell 1 is improved, thereby effectively improving the connection reliability and sealing tightness of the pole body 3 and the shell 1, and thus the reliability of the battery cell 102 can be improved.

[0264] Furthermore, since the problem of warping of the abutting portion 32 can be improved, the problem of the warping of the abutting portion 32 affecting the assembly and connection of the current collecting component 103 can be alleviated, thereby improving the smoothness and reliability of the connection between the current collecting component 103 and the pole cover 4. In addition, since the connecting portion 41 connecting the pole cover 4 to the pole body 3 is separated from the side groove wall of the recess 31 near the abutting portion 32, the assembly clearance requirement between the pole cover 4 and the pole body 3 can be reduced, the processing accuracy requirement of the pole cover 4 can be reduced, and the compatibility of the pole body 3 can be increased.

[0265] 3-8 , the penetration portion 33 is formed in an annular shape, and the receiving groove 36 is located in the inner ring area of ​​the penetration portion 33. The side of the recessed groove 31 near the central axis L of the mounting hole 12 is open to communicate with the receiving groove 36. The pole body 3 has a connecting hole 37, which passes through the groove wall of the receiving groove 36 near the receiving cavity 11 and connects the receiving cavity 11 with the receiving groove 36. The battery cell assembly 7 includes an active material coating portion 71 and a conductive portion 72. The active material coating portion 71 is received in the receiving cavity 11. The conductive portion 72 connects the active material coating portion 71 with the pole body 3. The conductive portion 72 is passed through the connecting hole 37 to be at least partially received in the receiving groove 36. The portion of the conductive portion 72 located in the receiving groove 36 is connected to the pole body 3.

[0266] Therefore, by accommodating at least a portion of the conductive part 72 in the receiving groove 36, at least a portion of the conductive part 72 occupies the space in the receiving groove 36, thereby reducing the space occupied by the conductive part 72 in the receiving cavity 11, saving space in the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, thereby facilitating the improvement of the energy density of the battery cell 102, or reducing the size of the battery cell 102 when the energy density of the battery cell 102 remains unchanged.

[0267] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0268] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: A housing having a mounting hole, wherein a receiving cavity is defined in the housing; A pole body is passed through the mounting hole and includes a supporting portion that supports the outside of the housing. A sink groove is formed at the end of the pole body away from the accommodating cavity. The sink groove is arranged relative to the supporting portion and close to the central axis of the mounting hole. A pole cover plate is arranged on the pole body and includes a connecting portion connected to the pole body. The connecting portion is arranged in the sink and connected to a portion of the pole body located on the side of the sink close to the accommodating cavity, and is spaced apart from a side wall of the sink close to the abutting portion.

2. The battery cell according to claim 1, wherein: The connecting portion is welded to a portion of the pole body located on a side of the sink close to the accommodating cavity.

3. The battery cell according to any one of claims 1 to 2, wherein: The pole body comprises a penetration portion penetrated through the mounting hole, and at least a portion of the connecting portion is disposed on and connected to the penetration portion.

4. The battery cell according to claim 3, wherein: The penetration portion is formed in a ring shape, and the radial width of the connecting portion covering the pole body is smaller than the radial wall thickness of the penetration portion.

5. The battery cell according to claim 3 or 4, wherein: The supporting portion is connected to the penetration portion and extends relative to the penetration portion in a direction away from the central axis of the mounting hole. The supporting portion protrudes from the penetration portion in a direction away from the accommodating cavity to define the recessed groove between a surface of the supporting portion close to the central axis of the mounting hole and a surface of the penetration portion away from the accommodating cavity.

6. The battery cell according to claim 5, wherein: The depth of the countersunk groove in the axial direction of the mounting hole is one third to two thirds of the thickness of the abutting portion in the axial direction of the mounting hole.

7. The battery cell according to any one of claims 3 to 6, wherein: The penetration portion is formed in a ring shape, and one side of the sink groove close to the central axis of the mounting hole is open to communicate with the inner ring area of ​​the penetration portion.

8. The battery cell according to any one of claims 3 to 7, wherein: The supporting portion includes a first section and a second section which are sequentially arranged in a direction away from the penetration portion, with a plane perpendicular to the axial direction of the mounting hole as a projection plane, and the axial direction of the mounting hole as a projection direction. The projection of the first section on the projection plane is located within the projection of the mounting hole on the projection plane, and the projection of the second section on the projection plane is located outside the projection of the mounting hole on the projection plane.

9. The battery cell according to any one of claims 1 to 8, wherein: The pole body forms the abutting portion by flanging and riveting.

10. The battery cell according to any one of claims 1 to 9, wherein: The distance between the connecting portion and a groove wall of the sinking groove close to the abutting portion gradually increases along a direction away from the accommodating cavity.

11. The battery cell according to any one of claims 1 to 10, wherein: The cross-sectional area of ​​the sink gradually increases in a direction away from the accommodating cavity.

12. The battery cell according to any one of claims 1 to 11, wherein: The pole cover comprises a cover body, the connection portion is located at an edge of the cover body, and a side surface of the cover body away from the accommodating cavity protrudes from a side surface of the connection portion away from the accommodating cavity.

13. The battery cell according to any one of claims 1 to 12, wherein: The thickness of the abutting portion in the axial direction of the mounting hole is greater than the thickness of the connecting portion in the axial direction of the mounting hole.

14. The battery cell according to any one of claims 1 to 13, wherein: The thickness of the connecting portion in the axial direction of the mounting hole is three quarters to five quarters of the depth of the countersunk groove in the axial direction of the mounting hole.

15. The battery cell according to any one of claims 1 to 14, wherein: The surface of the connecting portion away from the accommodating cavity extends obliquely along a direction away from the central axis of the mounting hole toward a direction close to the accommodating cavity.

16. The battery cell according to any one of claims 1 to 15, wherein: The pole body includes a penetration portion that penetrates the mounting hole, the supporting portion is connected to the penetration portion and extends relative to the penetration portion in a direction away from the central axis of the mounting hole, and the battery cell also includes an insulating sealing structure for insulating and sealing the shell and the pole body, and the insulating sealing structure includes a portion arranged between the penetration portion and the shell and a portion arranged between the supporting portion and the shell.

17. The battery cell according to claim 16, wherein: The connection between the supporting portion and the penetration portion has a first corner set toward the shell, and the corner of the shell set close to the first corner is a second corner. The insulating sealing structure includes a third corner set corresponding to the first corner, and a fourth corner set corresponding to the second corner, and at least one of the first corner, the second corner, the third corner and the fourth corner is formed as a chamfer.

18. The battery cell according to claim 16 or 17, wherein: The connection between the supporting portion and the penetration portion has a first corner set toward the shell, and the corner of the shell set close to the first corner is the second corner. The insulating sealing structure includes a third corner set corresponding to the first corner, and a fourth corner set corresponding to the second corner. There is a fitting gap between the first corner and the third corner, and / or there is a fitting gap between the second corner and the fourth corner.

19. The battery cell according to any one of claims 16 to 18, wherein: The connection between the supporting portion and the penetration portion has a first corner set toward the shell, and the corner of the shell set close to the first corner is the second corner. The insulating sealing structure includes a first part and a second part. The material hardness of the first part is less than the material hardness of the second part, and the first part is set relative to the second part close to at least one of the first corner and the second corner.

20. The battery cell according to claim 19, wherein: The first part includes a first sub-part, which is arranged near the first corner relative to the second part. The first sub-part defines a part of the side surface of the insulating sealing structure facing the supporting part, and / or defines a part of the side surface of the insulating sealing structure facing the penetrating part.

21. The battery cell according to any one of claims 16 to 20, wherein: The end of the penetration portion connected to the supporting portion and the supporting portion form a first pole portion, and the insulating sealing structure includes a first insulating seal fitted between the first pole portion and the shell, and a cushion is provided between the first pole portion and the shell for buffering the force applied to the first insulating seal by the first pole portion and / or the shell.

22. The battery cell according to claim 21, wherein: The gasket is arranged between the housing and the first insulating seal, and / or between the first pole portion and the first insulating seal.

23. The battery cell according to claim 22, wherein: The gasket includes at least one of a first gasket, a second gasket and a third gasket, wherein the first gasket is arranged between the supporting portion and the first insulating seal, the second gasket is arranged between the penetrating portion and the first insulating seal, and the third gasket is arranged between the first insulating seal and the outer surface of the shell, and the material hardness of the third gasket is less than the material hardness of the first insulating seal.

24. The battery cell according to any one of claims 1 to 23, wherein: The pole body is formed with a receiving groove which is open in a direction away from the receiving cavity, the sink groove is arranged around the receiving groove and is connected with the receiving groove, and the pole body is provided with a connecting hole which passes through a groove wall on one side of the receiving groove close to the receiving cavity and connects the receiving cavity with the receiving groove.

25. The battery cell according to claim 24, wherein: The battery cell comprises a cell assembly, the cell assembly comprises an active material coating portion received in the receiving cavity, and a conductive portion connected to the active material coating portion, the conductive portion is passed through the connecting hole to be at least partially received in the receiving groove.

26. The battery cell according to claim 24 or 25, wherein: A liquid injection hole that can communicate with the receiving groove is formed on the pole cover plate, and the battery cell also includes a sealing structure for sealing the liquid injection hole.

27. A battery cell, wherein: include: A housing having a mounting hole, wherein a receiving cavity is defined in the housing; The pole body comprises a penetration portion penetrated through the mounting hole and a supporting portion supported outside the housing, the supporting portion is connected to the penetration portion and extends relative to the penetration portion in a direction away from the central axis of the mounting hole, and a sink groove is formed between the supporting portion and the penetration portion and is open in a direction away from the accommodating cavity; A pole cover plate is arranged on the pole body, an edge of the pole cover plate is arranged in the sink groove, and is penetrated and welded with the penetration portion, and a welding structure formed by welding is spaced apart from the abutting portion.

28. A battery cell, wherein: include: A housing having a mounting hole; A pole body, which is passed through the mounting hole and includes a supporting portion that supports the outside of the shell; A pole cover plate is covered on the pole body and includes a connecting portion connected to the pole body, with a surface perpendicular to the axial direction of the mounting hole as a projection surface, and the axial direction of the mounting hole as a projection direction. The projection of the portion of the supporting portion that abuts against the shell on the projection surface is separated from the projection of the connecting portion on the projection surface.

29. The battery cell according to claim 28, wherein: The pole body includes a penetration portion penetrated through the mounting hole, the supporting portion is connected to the penetration portion and extends relative to the penetration portion in a direction away from the central axis of the mounting hole, a portion of the projection of the supporting portion on the projection plane is located within the projection range of the mounting hole on the projection plane, the projection of the connecting portion on the projection plane is located within the projection range of the penetration portion on the projection plane, and the connecting portion is arranged on the penetration portion and connected to the penetration portion.

30. A battery, wherein: The invention comprises a battery cell according to any one of claims 1 to 29.

31. An electrical device, wherein: Comprising a battery according to claim 30.

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