Battery cell, battery, and electric device

Abstract

The application provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The battery monomer comprises a shell, a pole body and a pole cover plate. The shell has a mounting hole, and a containing cavity is defined in the shell. The pole body is arranged in the mounting hole and comprises a bearing part arranged outside the shell. The end of the pole body away from the containing cavity is provided with a sink. The sink is arranged close to the central axis of the mounting hole relative to the bearing part. The pole cover plate is arranged on the pole body and comprises a connecting part connected with the pole body. The connecting part is arranged in the sink and connected with the part of the pole body in the sink close to the containing cavity, and is spaced apart from the side groove wall of the sink close to the bearing part. The battery monomer is beneficial to improving the warping problem of the bearing part, improving the reliability of the bearing of the bearing part and the shell, and further improving the connection reliability and sealing tightness of the pole body and the shell.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery and an electric device. BACKGROUND

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable important role. Among them, the power battery includes a plurality of battery monomers, however, the reliability of the battery monomer needs to be improved. SUMMARY

[0003] The embodiments of the present application provide a battery monomer, a battery and an electric device, which can improve the reliability of the battery monomer.

[0004] In a first aspect, the embodiments of the present application provide a battery monomer, comprising a shell, a pole post body and a pole post cover plate, the shell has a mounting hole, a containing cavity is defined in the shell, the pole post body is arranged in the mounting hole and comprises a bearing part bearing on the outside of the shell, an end of the pole post body away from the containing cavity is formed with a sink, the sink is arranged close to the central axis of the mounting hole relative to the bearing part, and the pole post cover plate is arranged on the pole post body and comprises a connecting part connected with the pole post body, the connecting part is arranged in the sink and connected with the part of the pole post body in the sink close to the containing cavity, and is spaced apart from the side groove wall of the sink close to the bearing part.

[0005] In the above technical solution, by connecting the connecting part with the part of the pole post body in the sink close to the containing cavity, and spacing the connecting part from the side groove wall of the sink close to the bearing part to form a spacing space, such arrangement not only meets the connection requirement of the pole post cover plate and the pole post body, but also the force generated by the connection of the pole post cover plate and the pole post body can be blocked by the spacing space to reduce the transmission of the force to the bearing part, thereby facilitating the improvement of the problem of the bearing part being raised due to the force, improving the reliability of the bearing of the bearing part and the shell, and further improving the connection reliability and sealing tightness of the pole post body and the shell, so that the reliability of the battery monomer can be improved. Moreover, since the problem of the bearing part being raised can be improved, the problems of affecting the assembly and connection of the busbar component due to the bearing part being raised can be improved, and the smoothness and reliability of the connection of the busbar component and the pole post cover plate can be improved. In addition, since the connecting part of the pole post cover plate and the pole post body is spaced apart from the side groove wall of the sink close to the bearing part, the assembly gap requirement between the pole post cover plate and the pole post body can be reduced, the machining precision requirement of the pole post cover plate is reduced, and the compatibility of the pole post body is increased.

[0006] In some embodiments, the connecting part is welded with the part of the pole post body in the sink close to the containing cavity.

[0007] In the technical solution, the connecting portion is connected with the pole body by welding, which improves the connection reliability of the pole body and the pole cover, and eliminates other components for connection, thus simplifying the structure and reducing the cost. In addition, the part of the connecting portion and the pole body located on the side of the sink close to the accommodating cavity is welded, and the connecting portion is spaced from the side wall of the sink close to the abutting portion after the molten pool solidifies, so that the shrinkage stress generated by the molten pool solidification is blocked and difficult or less transmitted to the abutting portion, thereby improving the warping problem of the abutting portion.

[0008] In some embodiments, the pole body includes a penetrating portion penetrating the mounting hole, and at least part of the connecting portion is arranged on the penetrating portion and connected with the penetrating portion.

[0009] In the technical solution, at least part of the connecting portion is arranged on the penetrating portion and connected with the penetrating portion. Since the penetrating portion penetrates the mounting hole, the penetrating portion can have a relatively sufficient size in the axial direction of the mounting hole to connect with the connecting portion, which is beneficial to improve the connection reliability of the pole body and the pole cover. For example, when the connecting portion and the penetrating portion are welded, the connecting portion can have a sufficient penetration depth, thereby improving the welding reliability of the two.

[0010] In some embodiments, the penetrating portion is annular, and the radial width of the connecting portion covering the pole body is less than the radial wall thickness of the penetrating portion.

[0011] In the technical solution, when the penetrating portion is annular, the radial width D2 of the connecting portion covering the pole body is less than the radial wall thickness D1 of the penetrating portion, so that the radial wall thickness of the penetrating portion is sufficient to support and connect with the connecting portion, thereby improving the connection reliability of the pole body and the pole cover. For example, when the connecting portion and the penetrating portion are welded, the connecting portion can be welded only with the penetrating portion, and the connection has a sufficient width, thereby improving the welding reliability of the two.

[0012] In some embodiments, the abutting portion is connected with the penetrating portion and extends away from the central axis of the mounting hole relative to the penetrating portion, and the abutting portion protrudes from the penetrating portion toward the direction away from the accommodating cavity, so as to define the sink between the surface of the abutting portion close to the central axis of the mounting hole and the surface of the penetrating portion away from the accommodating cavity.

[0013] In the technical solution, the sink is defined by the abutting portion and the penetrating portion, which simplifies the structure of the pole body and makes the sink easy to design and process. In addition, compared with the solution of locally recessing the side surface of the penetrating portion away from the accommodating cavity to form the sink, the radial outer boundary of the sink can extend away from the central axis of the mounting hole, which is convenient for cooperation with the connecting portion of the pole cover and is beneficial to meet the requirement that the side wall of the sink is spaced from the connecting portion.

[0014] In some embodiments, the depth of the sink 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.

[0015] In the above technical solution, the depth of the sink is not too deep to ensure that the connecting position of the abutting portion and the penetrating portion has a sufficient wall thickness, thereby improving the structural strength of the weak part of the pole body, and the depth of the sink is not too shallow to enable the connecting portion to be accommodated in the sink to a large extent, thereby reducing the volume of the connecting portion protruding outside the sink and improving the interference problem caused by the protrusion of the connecting portion during the assembly and connection of the busbar component.

[0016] In some embodiments, the penetrating portion is formed in an annular shape, and the side of the sink close to the central axis of the mounting hole is open to communicate with the inner annular area of the penetrating portion.

[0017] In the above technical solution, when the penetrating portion is formed in an annular shape, the side of the sink close to the central axis of the mounting hole is open to communicate with the inner annular area of the penetrating portion, which can further simplify the design and processing of the sink. Compared with the solution in which the side of the sink close to the central axis of the mounting hole is closed when the penetrating portion is formed in an annular shape, the radial inner boundary of the sink can extend towards 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.

[0018] In some embodiments, the abutting portion includes a first segment and a second segment arranged in sequence in a direction away from the penetrating portion, the projection plane is the plane perpendicular to the axial direction of the mounting hole, and the projection direction is the axial direction of the mounting hole. The projection of the first segment on the projection plane is located within the projection of the mounting hole on the projection plane, and the projection of the second segment on the projection plane is located outside the projection of the mounting hole on the projection plane.

[0019] In the above technical solution, the second segment can abut against the shell to meet the abutting cooperation requirement of the pole body and the shell. Moreover, since the first segment between the second segment and the sink is not used for abutting against the shell, the slot side wall of the sink is defined by the first segment, thereby improving the problem of the second segment being raised due to the connection of the connecting portion and the penetrating portion, and further improving the reliability of the abutting cooperation of the abutting portion and the shell.

[0020] In some embodiments, the pole body forms the abutting portion by flanging and riveting.

[0021] In the above technical solution, the pole body is convenient to process, and the sink can be easily obtained. Moreover, when the abutting portion is connected with the penetrating portion, the connection reliability of the abutting portion and the penetrating portion is improved, and the assembly reliability of the pole body and the shell is improved.

[0022] In some embodiments, the distance between the connecting portion and the side wall of the sink close to the abutting portion gradually increases along a direction away from the accommodating cavity.

[0023] In the above technical solution, the connecting portion is facilitated to be assembled to the sink, and at the position with a larger distance, the position corresponding to the solidification shrinkage deformation of the welding pool is larger, and by setting a larger distance, the problem of the abutting portion being warped is further improved, and in addition, at the position with a smaller distance, the structural strength of the wall thickness smaller part of the pole body due to the setting of the groove is improved.

[0024] In some embodiments, the cross-sectional area of the sink gradually increases along a direction away from the accommodating cavity.

[0025] In the above technical solution, the sink is in the form of an expansion, thereby facilitating the assembly of the connecting portion of the pole cover plate to the sink and improving the assembly efficiency of the pole cover plate and the pole body. Moreover, when the sink is in the form of an expansion, the design that the distance between the connecting portion and the side wall of the sink close to the abutting portion gradually increases along a direction away from the accommodating cavity is achieved.

[0026] In some embodiments, the pole cover plate comprises a cover plate body, the connecting portion is located at the edge of the cover plate body, and the side surface of the cover plate body away from the accommodating cavity is protruded from the side surface of the connecting portion away from the accommodating cavity.

[0027] In the above technical solution, the interference influence on the assembly of the current collecting component due to the protrusion of the connecting portion from the cover plate body can be avoided, and the assembly convenience of the current collecting component and the connection reliability of the current collecting component and the pole cover plate are improved.

[0028] In some embodiments, 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.

[0029] In the above technical solution, since the thickness of the abutting portion is relatively greater than the thickness of the connecting portion, the deformation of the abutting portion is reduced, and the problem of the abutting portion being warped due to the connection of the connecting portion and the pole body is further improved.

[0030] In some embodiments, the thickness of the connecting portion in the axial direction of the mounting hole is three-fourths to five-fourths of the depth of the sink in the axial direction of the mounting hole.

[0031] 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 sink in the axial direction of the mounting hole, and the connecting portion can be substantially accommodated in the sink, so as to reduce the interference influence on the assembly of the current collecting component due to the protrusion of the connecting portion from the outer surface of the abutting portion.

[0032] In some embodiments, the surface of the connecting portion away from the accommodating cavity extends obliquely in a direction away from the central axis of the mounting hole and towards the direction close to the accommodating cavity.

[0033] In the above technical solution, the thickness of the connecting portion is relatively thick near the cover plate body and relatively thin near the groove side wall of the sink, so that the processing of the connecting portion of the pole cover plate is facilitated, material waste is reduced, and cost is reduced. Moreover, the thickness of the connecting portion is relatively thick near the cover plate body and relatively thin near the groove side wall of the sink, so that the reliability of the connecting portion connecting the pole cover plate and the pole body can be improved. Moreover, the wall thickness of the pole cover plate at the connecting portion is reduced, which is beneficial to avoid interference with the assembly of the busbar caused by the connection of the connecting portion and the pole body. In addition, when the connecting portion is connected to the pole body by laser welding, the laser reflection path and the laser incidence path form an included angle by setting the connecting portion in the above inclined form, so that the problem of laser damage caused by laser reflection is improved, and the laser is protected.

[0034] In some embodiments, the pole body includes a penetrating portion penetrating the mounting hole, and the abutting portion is connected to the penetrating portion and extends away from the central axis of the mounting hole. The battery cell further includes an insulating sealing structure for insulating and sealingly connecting the shell and the pole body. The insulating sealing structure includes a portion arranged between the penetrating portion and the shell and a portion arranged between the abutting portion and the shell.

[0035] In the above technical solution, the pole body and the shell are indirectly contacted by arranging the insulating sealing structure, so that the shell and the pole body are insulated and sealed, and the connection requirement is met, so that the shell and the pole body do not need to be designed as a complex composite structure for insulation and sealing, thereby simplifying the design and processing of the shell and the pole body. Moreover, since the insulating sealing structure includes a portion arranged between the penetrating portion and the shell and a portion arranged between the abutting portion and the shell, the stability of the insulating sealing structure and the sufficiency of the insulation and sealing can be improved, thereby improving the reliability of the insulating sealing structure.

[0036] In some embodiments, the connecting portion has a first corner arranged towards the shell, a corner of the shell near the first corner is a second corner, the insulating sealing structure includes a third corner corresponding to the first corner and a fourth corner 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 chamfered corner.

[0037] In the above technical solution, by using a chamfered corner instead of a right angle, the stress area or force application area can be increased, the local pressure and stress concentration can be reduced, the cracking risk of the insulating sealing structure at the third corner or the fourth corner, which is 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 insulation and sealing effect can be improved.

[0038] In some embodiments, the connecting part between the abutting part and the penetrating part has a first corner arranged towards the shell, a corner of the shell arranged close to the first corner is a second corner, the insulating sealing structure comprises a third corner arranged corresponding to the first corner, and a fourth corner arranged corresponding to the second corner, a fitting gap is arranged between the first corner and the third corner, and / or a fitting gap is arranged between the second corner and the fourth corner.

[0039] In the above technical solution, when the fitting gap is arranged between the first corner and the third corner, the extrusion of the first corner to the third corner can be reduced, so that the risk of cracking of the insulating sealing structure from the position of the third corner can be reduced. When the fitting gap is arranged between the second corner and the fourth corner, the extrusion of the second corner to the fourth corner can be reduced, so that the risk of cracking of the insulating sealing structure from the position of the fourth corner can be reduced.

[0040] In some embodiments, the connecting part between the abutting part and the penetrating part has a first corner arranged towards the shell, a corner of the shell arranged close to the first corner is a second corner, the insulating sealing structure comprises a first part and a second part, the material hardness of the first part is less than that of the second part, and the first part is arranged close to at least one of the first corner and the second corner relative to the second part.

[0041] In the above technical solution, when the shell is assembled and fixed with the pole body, the position where the insulating sealing structure is prone to cracking is arranged as the first part with relatively soft material hardness, the first part is prone to compressive deformation under force, and the force can be absorbed, so that the risk of cracking at this position can be reduced.

[0042] In some embodiments, the first part comprises a first sub-part, the first sub-part is arranged close to the first corner relative to the second part, and the first sub-part defines a part of the side surface of the insulating sealing structure towards the abutting part and / or a part of the side surface of the insulating sealing structure towards the penetrating part.

[0043] In the above technical solution, the first sub-part is exposed to the outer surface of the insulating sealing structure at the position close to the first corner, so that the compressive deformation under force can be better, and the cracking problem at this position can be better alleviated. Moreover, the difficulty of combined processing of the first sub-part and the second part can be reduced.

[0044] In some embodiments, the end of the penetrating part connected with the abutting part and the abutting part constitute a first pole part, the insulating sealing structure comprises a first insulating sealing member fitted between the first pole part and the shell, and a cushion member is arranged between the first pole part and the shell for buffering the force applied by the first pole part to the first insulating sealing member.

[0045] In the above technical solution, by setting a gasket, the force exerted by the first pole post on the first insulating seal can be reduced, thereby reducing the damage to the first insulating seal and protecting it, thus improving the cracking problem of the first insulating seal.

[0046] In some embodiments, the gasket is disposed between the housing and the first insulating seal, and / or between the first pole portion and the first insulating seal.

[0047] In the above technical solution, the assembly of the gasket is convenient, the production difficulty is reduced, and the first insulating seal can be a single piece, which facilitates the processing and assembly of the first insulating seal.

[0048] In some embodiments, the gasket includes at least one of a first gasket, a second gasket, and a third gasket. The first gasket is disposed between the abutment portion and the first insulating seal, the second gasket is disposed between the through portion and the first insulating seal, and the third gasket is disposed between the first insulating seal and the outer surface of the housing, wherein the material hardness of the third gasket is less than that of the material hardness of the first insulating seal.

[0049] In the above technical solution, when a first gasket is provided between the first insulating seal and the supporting part, when the pole body is installed into the housing and the supporting part presses against the first insulating seal in the direction of 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 through part, when the pole body is installed into the housing and the through part presses against the first insulating seal in the direction of 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 installed into the housing and the pole body presses against the first insulating seal in the direction of the housing, the first insulating seal can transmit the force to the third gasket. Since the material of the third gasket has relatively low hardness, it can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the first insulating seal. This buffers the force applied to the first insulating seal by the first pole part, reducing damage to the first insulating seal.

[0050] In some embodiments, a receiving groove is formed on the electrode body, opening in a direction away from the receiving cavity, a sink is disposed around the receiving groove and communicates with the receiving groove, and the electrode body has a connecting hole that penetrates the side wall of the receiving groove near the receiving cavity and communicates the receiving cavity and the receiving groove.

[0051] In the above technical solution, when electrolyte is injected into a battery cell, the electrolyte can be injected into a receiving tank and then flow towards the receiving cavity through a connecting hole. The receiving tank acts as a buffer for the electrolyte, mitigating problems such as splashing and overflow. Furthermore, the sidewall of the receiving tank (i.e., the tank wall extending from the tank opening towards the receiving cavity) can, to some extent, prevent electrolyte splashing, reducing external contamination and facilitating rapid electrolyte injection. Moreover, since there is no need to create a separate injection channel on the casing, no special processing of the casing is required, which helps reduce the structural complexity and manufacturing difficulty of the casing.

[0052] In some embodiments, the battery cell includes a cell assembly, the cell assembly including an active material coating portion housed in a receiving cavity, and a conductive portion connected to the active material coating portion, the conductive portion passing through a connecting hole to be at least partially housed in the receiving groove.

[0053] In the above technical solution, by housing at least a portion of the conductive part in the receiving groove, the conductive part occupies at least a portion of the space in the receiving groove, thereby reducing the space occupied by the conductive part in the receiving cavity and 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, if the energy density of the battery cell remains unchanged, it is beneficial to reduce the size of the battery cell.

[0054] In some embodiments, an injection hole is formed on the terminal cover plate that can communicate with the receiving groove, and the battery cell also includes a sealing structure for sealing the injection hole.

[0055] In the above technical solution, by machining the liquid injection hole on the electrode cover plate, the opening is relatively small and located on the outside, so that the liquid injection inlet can be reliably sealed through the sealing structure, thereby improving the working reliability of the battery cell and enabling flexible and diversified design of the sealing structure.

[0056] Secondly, embodiments of this application also provide a battery cell, including a housing, a terminal body, and a terminal cover plate. The housing has a mounting hole and a receiving cavity is defined inside the housing. The terminal body includes a through portion passing through the mounting hole and a supporting portion abutting against the outside of the housing. The supporting portion is connected to the through portion and extends relative to the through portion in a direction away from the central axis of the mounting hole. A recessed groove is formed between the supporting portion and the through portion, opening in a direction away from the receiving cavity. The terminal cover plate covers the terminal body, and the edge of the terminal cover plate is disposed in the recessed groove and is welded through the through portion. The welded structure is spaced apart from the supporting portion.

[0057] In the above technical solution, since the edge of the pole cover plate is set in the sink and is welded through the through part, and the welded structure formed by the welding is separated from the supporting part, it is beneficial to improve the problem of the supporting part lifting due to welding, improve the reliability of the supporting part and the shell, and thus improve the connection reliability and sealing tightness between the pole body and the shell, thereby improving the reliability of the battery cell.

[0058] Thirdly, embodiments of this application also provide a battery cell, including a housing, a terminal body, and a terminal cover plate. The housing has a mounting hole, the terminal body passes through the mounting hole and includes a supporting portion that abuts against the outside of the housing, and the terminal cover plate covers the terminal body and includes a connecting portion that connects to the terminal body. The projection plane is a plane perpendicular to the axis of the mounting hole, and the projection direction is the axis of the mounting hole. The projection of the portion of the supporting portion that abuts against the housing on the projection plane is spaced apart from the projection of the connecting portion on the projection plane.

[0059] In the above technical solution, since the projection of the part of the abutting part that abuts against the shell on the projection surface is separated from the projection of the connecting part on the projection surface, it is beneficial to improve the problem of the abutting part lifting up due to the connection between the connecting part and the electrode body, improve the reliability of the abutting part and the shell, and thus improve the connection reliability and sealing tightness between the electrode body and the shell, thereby improving the reliability of the battery cell.

[0060] In some embodiments, the pole body includes a through portion passing through the mounting hole, a supporting portion connected to the through portion and extending relative to the through 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 surface is 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 through portion on the projection surface, and the connecting portion is disposed on the through portion and connected to the through portion.

[0061] In the above technical solution, the connecting part can be further moved away from the part of the supporting part that abuts against the housing, thereby further improving the problem of the lifting of the part of the supporting part that abuts against the housing.

[0062] Fourthly, embodiments of this application also provide a battery, including a battery cell of any of the above-described solutions.

[0063] In the above technical solution, the reliability of the battery cell according to the embodiment of this application is improved, which is beneficial to improving the performance of the battery.

[0064] Fifthly, embodiments of this application also provide an electrical device including a battery from any of the above-described solutions.

[0065] In the above technical solution, the improved battery performance is beneficial to enhancing the power consumption performance of the electrical device. Attached Figure Description

[0066] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0067] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0068] Figure 2 Exploded views of the battery structure provided in some embodiments of this application;

[0069] Figure 3 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0070] Figure 4 A schematic diagram of the orthographic projection of a single battery cell provided in some embodiments of this application;

[0071] Figure 5 For along Figure 4 Sectional view of line AA in the middle;

[0072] Figure 6 for Figure 5 A magnified view of a portion of the image;

[0073] Figure 7 for Figure 6 A magnified view of part B, shown in the center circle;

[0074] Figure 8 for Figure 7 A magnified view of part C, circled in the middle;

[0075] Figure 9 A cross-sectional view of the assembly of the pole body and pole cover plate, etc., provided in some embodiments of this application;

[0076] Figure 10 for Figure 9 A magnified view of part D, circled in the middle;

[0077] Figure 11 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0078] Figure 12 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0079] Figure 13 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0080] Figure 14 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0081] Figure 15 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0082] Figure 16 This is an assembly cross-sectional view of the pole post cover and sealing structure provided in some embodiments of this application;

[0083] Figure 17 Assembly diagrams of the pole cap and sealing structure provided in some embodiments of this application;

[0084] Figure 18 Partial cross-sectional view of a battery cell provided in some embodiments of this application;

[0085] Figure 19 This is a schematic diagram illustrating the interaction between a battery cell and a busbar component according to some embodiments of this application.

[0086] Reference numerals: 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; Busbar component 103; Housing 1; Receiving cavity 11; Mounting hole 12; Central axis L; First housing wall 13; Second corner 131; Second housing wall 14; Terminal post 2; Terminal post body 3; Recess trough 31; Side wall of trough 311; Bottom wall of trough 312; Supporting part 32; First section 321; Second section 322; Through part 33; Upper end 331; Lower end 332; First corner 34; First terminal post part 35; Receiving groove 36; Connecting hole 37; Flange part 38; Second pole post 39; Pole post cover plate 4; Connecting part 41; Outer surface of connecting part 411; Cover plate 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 seal 61; Second seal 62; Battery cell assembly 7; Active material coating part 71; Conductive part 72; Insulating sealing structure 8; Third corner 81; Fourth corner 82; First part 83; First sub-part 831; Second sub-part 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 Implementation

[0087] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0088] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0089] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0090] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0091] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0092] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0093] In this application, "multiple" means two or more (including two).

[0094] In this application, the battery cell 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 are not limited to these. The battery cell may be cylindrical, flat, cuboid, or other shapes, etc., and the embodiments of this application are not limited to these. Battery cells are generally divided into three types according to their packaging method: cylindrical battery cells, square battery cells, and pouch battery cells, and the embodiments of this application are not limited to these.

[0095] The battery mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned 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 housing for encapsulating one or more battery cells or one or more battery modules. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0096] A battery cell includes a casing, a cell assembly, and an electrolyte. The casing houses the cell assembly and the electrolyte. The cell assembly includes at least one electrode assembly, which consists of a positive electrode, a negative electrode, and a separator. The electrode assembly can be a wound structure or a stacked structure, etc. The battery cell primarily functions by the movement of metal ions between the positive and negative electrode plates.

[0097] A positive electrode typically includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated onto the positive current collector. The positive current collector without a positive active material layer protrudes from the one with a positive active material layer, serving as the positive electrode tab. Taking a lithium-ion battery as an example, the material of the positive current collector can be aluminum, and the material of the positive active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide, etc.

[0098] A negative electrode typically includes a negative current collector and a negative active material layer. The negative active material layer is directly or indirectly coated onto the negative current collector. The negative current collector without a negative active material layer protrudes from the negative current collector with a negative active material layer, and the negative current collector without a negative active material layer serves as the negative electrode tab. The material of the negative current collector can be copper, and the material of the negative active material layer can be carbon or silicon, etc.

[0099] To ensure that the battery can withstand high currents without melting, multiple positive electrode tabs are stacked together to form the positive electrode tab portion, and multiple negative electrode tabs are stacked together to form the negative electrode tab portion. The housing has terminals; the positive electrode tabs are electrically connected to the positive electrode terminals, and the negative electrode tabs are electrically connected to the negative electrode terminals. For example, the tabs can be connected to the terminals to form a direct electrical connection between the tabs and the terminals. Alternatively, the battery cell assembly may include an adapter plate; the tabs are connected to the adapter plate, and the adapter plate is connected to the terminals to form an indirect electrical connection between the tabs and the terminals.

[0100] The material of the separator is not limited; for example, it can be polypropylene or polyethylene.

[0101] In some battery cells of related technologies, the casing has terminals that are electrically connected to the cell assembly inside the casing to achieve electrode output. When the terminal includes a terminal body and a terminal cover, the terminal body is mounted on the casing, the terminal cover is placed on the terminal body, and the edge of the terminal cover is welded to the edge of the terminal body. When the weld pool shrinks, the edge of the terminal body is prone to warping, adversely affecting the reliability and sealing tightness of the connection between the terminal body and the casing. Furthermore, when a busbar component needs to be welded to the terminal cover, if the edge of the terminal body warps, it will affect the assembly and connection of the busbar component to the terminal cover.

[0102] Therefore, embodiments of this application propose a battery cell, including a housing, a terminal body, and a terminal cover plate. The housing has a mounting hole and defines a receiving cavity inside the housing. The terminal body passes through the mounting hole and includes a supporting portion that abuts against the outside of the housing. A groove is formed at the end of the terminal body away from the receiving cavity. The groove is disposed relative to the supporting portion and close to the central axis of the mounting hole. The terminal cover plate covers the terminal body and includes a connecting portion that connects to the terminal body. The connecting portion is disposed in the groove and connected to the portion of the terminal body located in the groove near the receiving cavity side, and is spaced apart from the groove wall of the groove near the supporting portion.

[0103] Therefore, by connecting the connecting part to the portion of the electrode body located near the receiving cavity in the sink, and separating the connecting part from the side wall of the sink near the supporting part to form a gap space, this arrangement not only meets the connection requirements between the electrode cover and the electrode body, but also prevents the force generated by the connection between the electrode cover and the electrode body from being transmitted to the supporting part by the gap space. This helps to improve the problem of the supporting part tilting due to the force, improves the reliability of the supporting part against the housing, and further improves the connection reliability and sealing tightness between the electrode body and the housing, thus improving the reliability of the battery cell.

[0104] Furthermore, since the issue of the support portion warping can be improved, it helps to alleviate the problems that affect the assembly and connection of the busbar components caused by the warping of the support portion, thereby improving the smoothness and reliability of the connection between the busbar components and the pole cover plate. In addition, since the connection part between the pole cover plate and the pole body is spaced apart from the side wall of the groove near the support portion, the assembly clearance requirement between the pole cover plate and the pole body can be reduced, the machining accuracy requirement of the pole cover plate can be reduced, and the compatibility of the pole body can be increased.

[0105] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0106] For ease of explanation, the following embodiments will be described using a vehicle 1000 as an example of an electrical device according to an embodiment of this application.

[0107] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle 1000 provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery 100 is disposed inside the vehicle 1000, and the battery 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery 100 can be used to power the vehicle 1000; for example, the battery 100 can serve as the 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 supply power to the motor 300, for example, to meet the power needs of the vehicle 1000 during startup, navigation, and driving.

[0108] In some embodiments of this application, the battery 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0109] Please refer to Figure 2 , Figure 2This is an exploded view of the structure of a battery 100 provided in some embodiments of this application. The battery 100 includes a housing 101 and a plurality of battery cells 102, the battery cells 102 being housed within the housing 101. The housing 101 provides assembly space for the battery cells 102, and the housing 101 can adopt various structures. In some embodiments, the housing 101 may include a first housing body 1011 and a second housing body 1012, the first housing body 1011 and the second housing body 1012 overlapping each other, and the first housing body 1011 and the second housing body 1012 together define an assembly space for accommodating the battery cells 102. The second box body 1012 can be a hollow structure open at one end, 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 together define the assembly space. Alternatively, the first box body 1011 and the second box body 1012 can both be hollow structures open on one side, with the open side of the first box body 1011 covering the open side of the second box body 1012. Of course, the box 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.

[0110] In battery 100, multiple battery cells 102 can be connected in series, parallel, or in a hybrid configuration. A hybrid configuration means that multiple battery cells 102 are connected in both series and parallel configurations. Multiple battery cells 102 can be directly connected in series, parallel, or in a hybrid configuration, and then the entire assembly of the multiple battery cells 102 is housed within housing 101. Alternatively, battery 100 can also be composed of multiple battery cells 102 first connected in series, parallel, or in a hybrid configuration to form a battery module, and then multiple battery modules are connected in series, parallel, or in a hybrid configuration to form a whole, which is also housed within housing 101. Battery 100 may also include other structures; for example, battery 100 may also include a busbar component for electrically welding multiple battery cells 102.

[0111] 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 to these. The battery cell 102 can be cylindrical, flat, cuboid, etc. For example, see reference... Figure 3 In the embodiment shown, the length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z. The first direction X, the second direction Y, and the third direction Z are all perpendicular to each other.

[0112] According to a first aspect embodiment of this application, a battery cell 102 is proposed, combined with... Figures 4-6The battery cell 102 includes a housing 1 and a terminal post 2, the terminal post 2 being disposed in the housing 1, and a receiving cavity 11 being formed inside the housing 1. Exemplarily, the battery cell 102 includes a cell assembly 7, which 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 housed in the receiving cavity 11, and the conductive portion 72 is welded to the terminal post 2, such that the conductive portion 72 is electrically connected between the active material coating portion 71 and the terminal post 2. Figure 6 and Figure 7 The electrode post 2 includes an electrode post body 3 and an electrode post cover plate 4 covering the electrode post body 3. The conductive part 72 can be welded to the electrode post body 3, or the conductive part 72 can also be welded to the electrode post cover plate 4, so that the conductive part 72 and the electrode post 2 can be electrically connected.

[0113] Combination Figure 6 and Figure 7 The housing 1 has a mounting hole 12, which communicates with the receiving cavity 11 when the housing 1 is not assembled with other components. The pole body 3 passes through the mounting hole 12 and includes a supporting portion 32 that abuts against the outside of the housing 1. That is, at least a portion of the supporting portion 32 directly or indirectly contacts the side wall of the housing 1 away from the receiving cavity 11 (i.e., the outer wall surface of the housing 1) to present a supporting relationship, thereby preventing the pole body 3 from moving relative to the housing 1 towards the receiving cavity 11 under the blocking action of the housing 1. Exemplarily, the housing 1 includes a first housing wall 13, and the mounting hole 12 is formed on the first housing wall 13. With the axial direction of the mounting hole 12 as the projection direction and the surface perpendicular to the axial direction of the mounting hole 12 as the projection surface, the projection of the supporting portion 32 on the projection surface and the projection of the first housing wall 13 on the projection surface have an intersection area. The portion of the supporting portion 32 corresponding to the intersection area directly or indirectly contacts the housing 1 to present a supporting relationship.

[0114] It is worth noting that the pole body 3 may not only abut against the outer wall surface of the housing 1 through the abutting part 32. For example, in some embodiments, a partial structure of the pole body 3 located outside the housing 1 and used to define the bottom wall 312 of the sink 31 also abuts against the outer wall surface of the housing 1. Therefore, in the embodiments of this application, the pole body 3 may abut against the outer wall surface of the housing 1 only through the abutting part 32, or it may abut against the outer wall surface of the housing 1 simultaneously through the abutting part 32 and other parts besides the abutting part 32.

[0115] In addition, in some embodiments of this application, the pole body 3 may also have a portion that abuts against the housing 1. That is, a portion of the pole body 3 is in direct or indirect contact with the side wall of the housing 1 near the receiving cavity 11 (i.e., the inner wall of the housing 1). Alternatively, the pole body 3 may not extend into the housing 1, but may only include the portion that passes through the mounting hole 12 and the portion located outside the housing 1. No limitation is made here.

[0116] Combination Figure 6 and Figure 7 A groove 31 is formed at the end of the pole body 3 away from the receiving cavity 11. The groove 31 is positioned relative to the supporting portion 32 near the central axis L of the mounting hole 12. The groove 31 is recessed towards the receiving cavity 11 and open towards the direction away from the receiving cavity 11. The groove opening of the groove 31 is located on the side surface of the pole body 3 away from the receiving cavity 11. The groove 31 is positioned around the central axis L of the mounting hole 12, and the supporting portion 32 is positioned relative to the groove 31 away from the central axis L of the mounting hole 12.

[0117] Combination Figure 6 and Figure 7 The pole cover plate 4 is placed on the pole body 3 and includes a connecting part 41 connected to the pole body 3. The connecting part 41 is located in the sink 31 and connected to the part of the pole body 3 located in the sink 31 near the receiving cavity 11. The connecting part 41 is spaced apart from the side wall of the sink 31 near the supporting part 32. For example, a portion of the pole cover plate 4 can be provided on the bottom wall 312 of the sink 31. The bottom wall 312 is the side surface of the sink 31 near the receiving cavity 11. This portion of the pole cover plate 4 is connected to the pole body 3, for example by welding through the bottom wall 312, bonding to the bottom wall 312, or connecting through fasteners that penetrate the bottom wall 312, thereby realizing the connection between the pole cover plate 4 and the pole body 3. This portion of the pole cover plate 4 is the connecting part 41. There is a gap S between the connecting part 41 and the side wall 311 of the sink 31. The side wall 311 is the side surface of the sink 31 near the supporting part 32. It is worth noting that when this part of the pole cover plate 4 is connected to the pole body 3 by welding through the bottom wall 312 of the penetration groove, the connection part 41 can be formed as a solidified structure formed by the solidification of the molten pool. At this time, the connection part 41 is separated from the side wall of the settling tank 31 near the supporting part 32. This means that the solidified structure is separated from the side wall of the settling tank 31 near the supporting part 32.

[0118] Therefore, by connecting the connecting part 41 to the part of the electrode body 3 located near the receiving cavity 11 in the sink 31, and separating the connecting part 41 from the sink wall near the supporting part 32 to form a gap space S, this arrangement not only meets the connection requirements between the electrode cover plate 4 and the electrode body 3, but also prevents the force generated by the connection between the electrode cover plate 4 and the electrode body 3 from being transmitted to the supporting part 32 by the gap space S. This helps to improve the problem of the supporting part 32 tilting due to the force, improves the reliability of the supporting part 32 against the housing 1, and further improves the connection reliability and sealing tightness between the electrode body 3 and the housing 1, thus improving the reliability of the battery cell 102.

[0119] Furthermore, since the problem of the support portion 32 being warped can be improved, it helps to alleviate the problem of the support portion 32 being warped, which affects the assembly and connection of the busbar component 103, and improves the smoothness and reliability of the connection between the busbar component 103 and the pole post cover plate 4. In addition, since the connection portion 41 connecting the pole post cover plate 4 and the pole post body 3 is spaced apart from the side wall of the groove 31 near the support portion 32, the assembly clearance requirement between the pole post cover plate 4 and the pole post body 3 can be reduced, the machining accuracy requirement of the pole post cover plate 4 can be reduced, and the compatibility of the pole post body 3 can be increased.

[0120] In some embodiments of this application, the connecting part 41 is welded to the portion of the pole body 3 located on the side of the sink 31 near the receiving cavity 11. Therefore, by welding the connecting part 41 to the pole body 3, the connection reliability between the pole body 3 and the pole cover plate 4 can be improved, and other connecting components can be omitted, simplifying the structure and reducing costs.

[0121] It is worth noting that if the electrode cap plate is welded to the side wall of the settling tank near the supporting part to form a molten pool, the shrinkage stress generated by the solidification of the molten pool will be directly transmitted to the supporting part. Since the solidification shrinkage stress on the side of the molten pool away from the receiving cavity is greater, it can easily cause the supporting part to warp. Moreover, if the electrode cap plate needs to be welded to the side wall of the settling tank near the supporting part, it is necessary to ensure that the assembly gap between the electrode cap plate and the electrode body meets the welding requirements, resulting in poor compatibility of the electrode body and high machining precision requirements for both the electrode body and the electrode cap plate.

[0122] In the embodiments of this application, since the connecting part 41 is welded to the portion of the pole body 3 located near the receiving cavity 11 of the sink 31, and the connecting part 41 forms a molten pool that is separated from the side wall of the sink 31 near the supporting part 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 part 32, thereby improving the problem of the supporting part 32 warping. Moreover, since the connecting part 41 is welded to the bottom wall 312 of the sink rather than butt-welded to the side wall 311 of the sink, it is not necessary to ensure the assembly gap between the connecting part 41 and the side wall 311 of the sink to meet the butt-welding requirements. This allows for a larger gap between the connecting part 41 and the side wall 311 of the sink, thereby improving the compatibility of the pole body 3 and helping to reduce the machining accuracy of the pole cover plate 4 and the pole body 3.

[0123] In some embodiments of this application, combined with Figure 6 and Figure 7The edge of the pole cover plate 4 is formed as a connecting portion 41, meaning that the connecting portion 41 is located at the edge of the pole cover plate 4. Therefore, when the connecting portion 41 is used to connect with the pole body 3, the pole cover plate 4 does not have a portion of the outer periphery of the connecting portion 41 that is close to the groove wall near the support portion 32 of the groove 31. This further improves the transmission of force generated by the connection between the pole cover plate 4 and the pole body 3 to the support portion 32, thus preventing the support portion 32 from warping.

[0124] In some embodiments of this application, combined with Figure 6 and Figure 7 The pole body 3 includes a through portion 33 that passes through the mounting hole 12, and at least a portion of the connecting portion 41 is disposed on and connected to the through portion 33. The projection direction is the axial direction of the mounting hole 12, and the projection plane is a plane perpendicular to the axial direction of the mounting hole 12. The projection of the through portion 33 onto the projection plane falls within the projection range of the mounting hole 12 onto the projection plane. The side surface of the through portion 33 away from the receiving cavity 11 defines at least a portion of the bottom wall 312 of the settling tank 31.

[0125] Therefore, by providing at least a portion of the connecting part 41 on and connecting to the through part 33, and since the through part 33 passes through the mounting hole 12, the through part 33 can have a relatively sufficient size in the axial direction of the mounting hole 12 to connect with the connecting part 41. This can help improve the connection reliability between the pole body 3 and the pole cover plate 4. For example, when the connecting part 41 and the through part 33 are welded, there can be sufficient penetration depth, thereby improving the welding reliability of the two. For another example, when the through part 33 and the connecting part 41 are connected by fasteners, the fasteners can penetrate into the through part 33 to a sufficient depth, thereby improving the connection reliability between the pole body 3 and the pole cover plate 4. Moreover, since the connection position of the connecting part 41 and the through part 33 is close to the mounting hole 12, it can be relatively far away from the position where the abutment part 32 abuts against the housing 1, thereby further improving the problem of the abutment part 32 warping.

[0126] In some embodiments of this application, combined with Figure 7The through-hole portion 33 is formed in an annular 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 through-hole portion 33. The radial wall thickness D1 is the radial wall thickness of the end of the through-hole portion 33 furthest from the receiving cavity 11, and the radial width D2 is the width of the connecting portion 41 covering the pole body 3 on one side radially along the through-hole portion 33. Therefore, when the through-hole portion 33 is annular, by setting the radial width D2 of the connecting portion 41 covering the pole body 3 to be smaller than the radial wall thickness D1 of the through-hole portion 33, the radial wall thickness of the through-hole portion 33 is sufficient to support and connect with the connecting portion 41, thereby improving the connection reliability between the pole body 3 and the pole cover plate 4. For example, when the connecting portion 41 and the through-hole portion 33 are welded, the connecting portion 41 can be welded only to the through-hole portion 33, and the connection has sufficient weld width, thereby improving the welding reliability of both.

[0127] Of course, this application is not limited to this. For example, in other embodiments of this application, when the through portion 33 is formed as an annular shape, the radial dimension D2 of the connecting portion 41 covering the through portion 33 can be greater than the radial wall thickness D1 of the through portion 33. In this case, only a portion of the connecting portion 41 is provided on the through portion 33, and this portion is connected to the through portion 33. At the same time, a portion of the connecting portion 41 can also extend to the side of the through portion 33 away from the central axis L of the mounting hole 12, and connect to this portion of the pole body 3. In this case, the side surface of the through portion 33 away from the receiving cavity 11 defines a portion of the bottom wall 312 of the sink 31, and the remaining portion of the bottom wall 312 of the sink 31 is defined by other structures of the pole body 3.

[0128] For example, in some other embodiments, the pole body 3 also includes a connecting portion (not shown) connecting the supporting portion 32 and the through portion 33. The connecting portion also abuts against the outer wall surface of the housing 1. The connecting portion and the through portion 33 together define the bottom wall 312 of the sink 31. The connecting portion 41 is disposed on the connecting portion and the through portion 33 and is welded to the connecting portion and the through portion 33 respectively.

[0129] In some embodiments of this application, combined with Figure 7The supporting portion 32 is connected to the through portion 33 and extends relative to the through portion 33 in a direction away from the central axis L of the mounting hole 12. The supporting portion 32 protrudes from the through portion 33 in a direction away from the receiving cavity 11 (i.e., the side surface of the supporting portion 32 away from the receiving cavity 11 protrudes relative to the side surface of the through portion 33 away from the receiving cavity 11 in a direction away from the receiving cavity 11, or simply put, the outer surface of the supporting portion 32 protrudes outward from the outer surface of the through portion 33), so as to define a recess 31 between the surface of the supporting portion 32 near the central axis L of the mounting hole 12 and the surface of the through portion 33 away from the receiving cavity 11. At this time, the sidewall 311 of the recess 31 can be defined by the side surface of the supporting portion 32 near the central axis L of the mounting hole 12, and the bottom wall 312 of the recess 31 can be defined by the side surface of the through portion 33 away from the receiving cavity 11.

[0130] Therefore, by defining the recess 31 together with the supporting part 32 and the through part 33, the structure of the pole body 3 can be simplified, making the recess 31 easier to design and manufacture. Moreover, compared with the solution of "partially recessing the surface of the through part 33 away from the receiving cavity 11 to form the recess 31", the radial outer boundary of the recess 31 can extend in a direction away from the central axis L of the mounting hole 12, which facilitates the cooperation with the connecting part 41 of the pole cover plate 4 and helps to meet the requirement that the groove sidewall 311 of the recess 31 and the connecting part 41 are spaced apart.

[0131] In some embodiments, such as Figure 7 As shown, 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 abutment 32 in the axial direction of the mounting hole 12. That is, H3 is 1 / 3 to 2 / 3 times H1. This ensures that the depth of the recess 31 is not too deep, so as to ensure that the connection position between the abutment 32 and the through part 33 has sufficient wall thickness to improve the structural strength of the weak part of the pole body 3, and also ensures that the depth of the recess 31 is not too shallow, so that the connecting part 41 can be accommodated in the recess 31 to a greater extent, thereby reducing the volume of the connecting part 41 protruding outside the recess 31 and improving the interference problem caused by the protrusion of the connecting part 41 to the assembly and connection of the busbar component 103.

[0132] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, when the depth H3 of the recess 31 in the axial direction of the mounting hole 12 is less than the thickness H1 of the abutment 32 in the axial direction of the mounting hole 12, if the thickness H2 of the connecting part 41 in the axial direction of the mounting hole 12 is close to the depth H3 of the recess 31 in the axial direction of the mounting hole 12, the connecting part 41 can be basically housed in the recess 31, so as to reduce the interference effect on the assembly of the busbar component 103 caused by the connecting part 41 protruding from the outer surface of the abutment 32.

[0133] In some embodiments, when the through portion 33 is formed as an annular shape, the side of the recess 31 near the central axis L of the mounting hole 12 can be opened to communicate with the inner annular region of the through portion 33. Therefore, by opening the side of the recess 31 near the central axis L of the mounting hole 12 to communicate with the inner annular region when the through portion 33 is formed as an annular shape, the design and manufacturing of the recess 31 can be further simplified. Compared to the scheme where "the side of the recess 31 near the central axis L of the mounting hole 12 is closed when the through portion 33 is formed as an annular shape," the radial inner boundary of the recess 31 can extend towards the central axis L of the mounting hole 12, facilitating its fit with the pole post cover plate 4 and simplifying the structural design of the pole post cover plate 4.

[0134] In some embodiments, such as Figure 7 As shown, the supporting portion 32 includes a first segment 321 arranged sequentially along a direction away from the penetrating portion 33 (e.g., Figure 7 The portion to the right of the auxiliary line L1 shown) and the second segment 322 (e.g. Figure 7 The portion to the left of the auxiliary line L1 shown in the figure has a projection plane perpendicular to the axis of the mounting hole 12, and the projection direction is the axis of the mounting hole 12. The projection of the first segment 321 on the projection plane is inside the projection of the mounting hole 12 on the projection plane, and the projection of the second segment 322 on the projection plane is outside the projection of the mounting hole 12 on the projection plane.

[0135] Therefore, the second segment 322 can abut against the housing 1 to meet the abutment and fit requirements between the pole body 3 and the housing 1. Moreover, since there is a first segment 321 between the second segment 322 and the sink 31 that is not used to abut against the housing 1, the first segment 321 defines the side wall 311 of the sink 31, thereby improving the problem of the second segment 322 lifting due to the connection between the connecting part 41 and the through part 33, which in turn helps to improve the reliability of the abutment and fit between the abutment part 32 and the housing 1.

[0136] Of course, this application is not limited to this. For example, in other embodiments of this application, the supporting part 32 can be configured such that the projection of the supporting part 32 on the projection surface is entirely outside the projection of the mounting hole 12 on the projection surface. In this case, the supporting part 32 and the through part 33 can be connected by a connecting part (not shown in the figure). At this time, the supporting part 32 still defines the side wall 311 of the sink 31, but the connecting part and the through part 33 together define the bottom wall 312 of the sink 31. The connecting part 41 is provided on the connecting part and the through part 33 and is welded to the connecting part and the through part 33 respectively.

[0137] In some embodiments of this application, such as Figure 7As shown, the pole body 3 forms the supporting portion 32 by flanging and riveting. That is, after the pole body 3 is assembled into the mounting hole 12, the supporting portion 32 is manufactured by flanging and riveting. Therefore, the pole body 3 is easy to process, and the groove 31 can be obtained relatively easily. Moreover, when the supporting portion 32 is connected to the through portion 33, it helps to improve the connection reliability between the supporting portion 32 and the through portion 33, and improves the assembly reliability between the pole body 3 and the housing 1. Of course, this application is not limited to this. For example, in other embodiments of this application, the pole body 3 may also be formed by welding two parts together, for example, by assembling the two parts separately into the mounting hole 12 and then welding the two parts together.

[0138] In some embodiments of this application, such as Figure 7 As shown, the distance between the connecting part 41 and the side wall of the settling tank 31 near the supporting part 32 is along the direction away from the receiving cavity 11 (e.g., Figure 7 The distance between the connecting part 41 and the side wall 311 of the groove 31 gradually increases from bottom to top. This facilitates the assembly of the connecting part 41 into the groove 31. Furthermore, at locations with larger intervals, corresponding to areas of greater shrinkage deformation during welding molten pool solidification, a larger interval helps to further mitigate the warping problem of the supporting part 32. Conversely, at locations with smaller intervals, it helps to improve the structural strength of the pole body 3 where the wall thickness is smaller due to the groove. It is understood that when the connecting part 41 and the through part 33 are welded to form a molten pool, the shrinkage stress at the end of the molten pool furthest from the receiving cavity 11 is greater. Setting a larger interval at this location helps to reduce the heat and shrinkage stress that could cause the supporting part 32 to warp.

[0139] In some embodiments of this application, such as Figure 7 As shown, the cross-sectional area of ​​the settling tank 31 is along the direction away from the receiving cavity 11 (e.g., Figure 7 As shown, the cross-sectional area gradually increases from bottom to top. Therefore, the recess 31 is flared, which facilitates the assembly of the connecting portion 41 of the pole cover plate 4 with the recess 31, improving the assembly efficiency of the pole cover plate 4 and the pole body 3. Furthermore, the flared shape of the recess 31 facilitates a design where the distance between the connecting portion 41 and the side wall of the recess 31 near the supporting portion 32 gradually increases in the direction away from the receiving cavity 11. It is worth noting that when the cross-sectional area of ​​the recess 31 gradually increases in the direction away from the receiving cavity 11, the side wall 311 of the recess 31 can be curved or inclined, depending on the specific circumstances.

[0140] In some embodiments of this application, such as Figure 8As shown, the pole cover 4 includes a cover body 42, a connecting portion 41 located at the edge of the cover body 42, and a side surface of the cover body 42 away from the receiving cavity 11 protruding (i.e. protruding in the direction away from the receiving cavity 11) from the side surface of the connecting portion 41 away from the receiving cavity 11. For example Figure 8 The upper surface of the cover body 42 shown protrudes upward relative to the upper surface of the connecting portion 41. This avoids interference with the assembly of the busbar component 103 caused by the connecting portion 41 protruding from the cover body 42, thereby improving the assembly convenience of the busbar component 103 and the connection reliability between the busbar component 103 and the pole cover 4.

[0141] For example, when the pole cover plate 4 and the pole body 3 are connected by welding, a countersunk edge can be provided at the edge of the cover plate body 42 during the processing of the pole cover plate 4. When the part of the pole cover plate 4 with the countersunk edge is welded to the pole body 3, the excess height of the connection part 41 formed by the weld will not exceed the outer surface of the cover plate body 42. This avoids interference with the assembly of the busbar component 103 caused by the connection part 41 protruding from the cover plate body 42, thereby improving the assembly convenience of the busbar component 103 and the connection reliability between the busbar component 103 and the pole cover plate 4. It is worth noting that the depth of the countersunk edge 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 part 41 is sufficient, thereby improving the connection reliability between the pole cover plate 4 and the pole body 3.

[0142] In some embodiments of this application, such as Figure 7 As shown, the pole cover 4 includes a cover body 42, a connecting portion 41 located at the edge of the cover body 42, and a side surface of the cover body 42 away from the receiving cavity 11 protruding from the side surface of the abutting portion 32 away from the receiving cavity 11 in a direction away from the receiving cavity 11. For example Figure 7 The upper surface of the cover plate body 42 shown protrudes upward relative to the upper surface of the supporting portion 32. Therefore, by setting the supporting portion 32 of the pole body 3 to be recessed relative to the cover plate body 42, interference caused by the protrusion of the supporting portion 32 to the assembly of the busbar component 103 can be avoided, thereby improving the assembly convenience of the busbar component 103 and the connection reliability between the busbar component 103 and the pole cover plate 4.

[0143] In some embodiments, such as Figure 7 and Figure 8 As shown, the thickness H1 of the supporting 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 supporting portion 32 is relatively larger than that of the connecting portion 41, it is beneficial to reduce the deformation of the supporting portion 32 and further improve the problem of the supporting portion 32 lifting up due to the connection between the connecting portion 41 and the pole body 3.

[0144] In some embodiments of this application, such as Figure 7 and Figure 8 As shown, 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 countersunk groove 31 in the axial direction of the mounting hole 12. That is, H2 is 3 / 4 to 5 / 4 times H3. Therefore, the thickness H2 of the connecting portion 41 in the axial direction of the mounting hole 12 is close to the depth H3 of the countersunk groove 31 in the axial direction of the mounting hole 12, and the connecting portion 41 can be roughly housed within the countersunk groove 31 to reduce the interference effect on the assembly of the busbar component 103 caused by the connecting portion 41 protruding from the outer surface of the supporting portion 32.

[0145] In some embodiments of this 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 countersunk groove 31 in the axial direction of the mounting hole 12, it is advantageous to avoid interference with the assembly of the busbar 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 countersunk groove 31 can accommodate the excess height generated by the connecting portion 41, thereby helping to avoid interference with the assembly of the busbar component 103 caused by the protrusion of the connecting portion 41.

[0146] In some embodiments of this application, such as Figure 9 and Figure 10 As shown, the surface of the connecting part 41 away from the receiving cavity 11 intersects the cross-section of the mounting hole 12 at an acute angle. It is worth noting that when the connecting part 41 is welded to the pole body 3, "the surface of the connecting part 41 away from the receiving cavity 11 intersects the cross-section of the mounting hole 12 at an acute angle" means that before the connecting part 41 is welded to the pole body 3, the surface of the connecting part 41 away from the receiving cavity 11 intersects the cross-section of the mounting hole 12 at an acute angle.

[0147] Specifically, the surface of the connecting portion 41 furthest from the receiving cavity 11 is the outer surface 411 of the connecting portion 41. The outer surface 411 of the connecting portion 41 intersects the cross-section of the mounting hole 12 at an acute angle. Therefore, the outer surface 411 of the connecting portion 41 is not parallel to the cross-section of the mounting hole 12, nor is it perpendicular to the axial direction of the mounting hole 12. In this way, when the laser welds the connecting portion 41 and the electrode body 3 along a direction parallel to the central axis L of the mounting hole 12, because the outer surface 411 of the connecting portion 41 is inclined as described above, the reflected laser will not return to the laser along the axial direction of the mounting hole 12. This improves the problem of laser return and damage to the laser, thus protecting the laser.

[0148] For example, when the connecting part 41 of the pole cover plate 4 is made of copper, 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 can easily lead to high reflection of copper damaging the laser. In the above embodiment of this application, the outer surface 411 of the connecting part 41 is set to be non-perpendicular to the incident path of the laser, which can make the reflection path of the laser deviate from the incident path of the laser, that is, can make the laser reflection path form an angle with the laser incident path, thereby avoiding the problem of the reflected laser damaging the laser.

[0149] In some embodiments, such as Figure 10 As shown, the surface of the connecting portion 41 away from the receiving cavity 11 extends obliquely towards the receiving cavity 11 along the direction away from the central axis L of the mounting hole 12. Therefore, since the thickness of the connecting portion 41 near the cover plate body 42 is relatively thick, and the thickness near the groove sidewall 311 of the recess 31 is relatively thin, the processing and forming of the connecting portion 41 of the pole post cover plate 4 is facilitated, reducing material waste and lowering costs. Furthermore, since the thickness of the connecting portion 41 near the cover plate body 42 is relatively thick, and the thickness near the groove sidewall 311 of the recess 31 is relatively thin, the reliability of the connection between the pole post cover plate 4 and the pole post body 3 can be improved.

[0150] Furthermore, by reducing the wall thickness of the pole cover plate 4 at the connection portion 41, it is beneficial to avoid interference with the assembly of the busbar component 103 caused by the connection between the connection portion 41 and the pole body 3. For example, problems such as excess height formed by welding, increased height caused by bonding, or fastener protrusion caused by fasteners may interfere with the assembly of the busbar component 103. By reducing the wall thickness at the connection portion 41, the above problems can be improved, and the assembly smoothness and connection reliability of the busbar component 103 can be enhanced.

[0151] Furthermore, since the surface of the connecting part 41 away from the receiving cavity 11 extends obliquely towards the receiving cavity 11 along the direction away from the central axis L of the mounting hole 12, the outer surface 411 of the connecting part 41 intersects the cross section of the mounting hole 12 at an acute angle. Thus, when the connecting part 41 is laser welded to the pole body 3, by setting the connecting part 41 in the above-mentioned oblique 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.

[0152] Additionally, 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 may also be configured to extend obliquely away from the receiving cavity 11 in a direction away from the central axis L of the mounting hole 12.

[0153] In some embodiments of this application, such as Figure 6 and Figure 7 As shown, the electrode body 3 includes a through portion 33 that passes through the mounting hole 12, and a supporting portion 32 that is connected to the through portion 33 and extends in a direction away from the central axis L of the mounting hole 12 relative to the through portion 33. The battery cell 102 also includes an insulating sealing structure 8 for insulating and sealing the housing 1 and the electrode body 3. The insulating sealing structure 8 includes a portion disposed between the through portion 33 and the housing 1 and a portion disposed between the supporting portion 32 and the housing 1.

[0154] Therefore, by setting the insulating sealing structure 8 so that the pole body 3 is in indirect contact with the housing 1, the housing 1 and the pole body 3 achieve an insulating and sealed connection. This eliminates the need to design the housing 1 or the pole body 3 as a complex composite structure for the purpose of insulation and sealing, thus simplifying the design and manufacturing of the housing 1 and the pole body 3. Moreover, since the insulating sealing structure 8 includes both the portion between the through part 33 and the housing 1 and the portion between the supporting part 32 and the housing 1, the stability of the insulating sealing structure 8 and the adequacy of the insulation seal can be improved, thereby enhancing the reliability of the insulating sealing structure 8 in achieving its insulation and sealing effect.

[0155] It is worth noting that the insulating sealing structure 8 can be a single component or composed of multiple components. When it is a single component, the component can be made of the same material or a combination of multiple materials. When it is composed of multiple components, the materials of the components can be the same or different, and any one of the components can be made of the same material or a combination of multiple materials. These can be flexibly set and there are no restrictions here.

[0156] In some embodiments of this application, such as Figure 7 As shown, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1. The corner of the housing 1 near the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 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. The chamfer can be a rounded corner or a beveled corner, and there is no limitation here.

[0157] Therefore, by using chamfers instead of right angles, the area of ​​force application or stress distribution 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 thus the reliability of the insulating sealing structure 8 in achieving the insulating sealing effect can be improved.

[0158] For example, when the pole body 3 is assembled and fixed to the housing 1, the first corner 34 is prone to pressing 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 as a chamfer, the area of ​​the force exerted by the first corner 34 on the third corner 81 can be increased, so that the force is dispersed, thereby reducing the concentrated force pressing 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 as a chamfer, when the first corner 34 exerts force on the third corner 81, the force-bearing 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.

[0159] For example, when the pole body 3 is assembled and fixed to the housing 1, the second corner 131 is prone to pressing the fourth corner 82, causing the insulating sealing structure 8 to crack at the position of the fourth corner 82. If the second corner 131 is set as a chamfer, the area of ​​the second corner 131 applying force to the fourth corner 82 can be increased, thus dispersing the force application position and reducing the concentrated force pressing the position of the fourth corner 82, thereby reducing the risk of the insulating sealing structure 8 cracking at the position of the fourth corner 82. If the fourth corner 82 is set as a chamfer, when the second corner 131 applies force to the fourth corner 82, the force-bearing area of ​​the fourth corner 82 can be increased, thus dispersing the force at the position of the fourth corner 82 and reducing the risk of the insulating sealing structure 8 cracking at the position of the fourth corner 82.

[0160] 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 a chamfer, the third corner 81 can be chamfered around the entire circumference of the insulating sealing structure 8, or it can be chamfered locally around the circumference of the insulating sealing structure 8, with the remaining positions being right angles. Furthermore, the chamfer shapes of the third corner 81 at different positions around 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 around the circumference of the insulating sealing structure 8, and beveled at the remaining positions.

[0161] Similarly, when the fourth corner 82 is a chamfer, the fourth corner 82 can be a chamfer around the entire circumference of the insulating sealing structure 8, or it can be a chamfer in a part of the circumference of the insulating sealing structure 8, with the remaining positions being right angles. Furthermore, the chamfer 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 a rounded corner at some positions along the circumference of the insulating sealing structure 8, and a beveled corner at the remaining positions.

[0162] In some embodiments of this application, such as Figure 7As shown, regardless of whether at least one of the first corner 34 and the third corner 81 is processed into a chamfered form, a fitting gap can be provided between the first corner 34 and the third corner 81. This can reduce the compression of the third corner 81 by the first corner 34 to a certain extent, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the third corner 81.

[0163] In some embodiments of this application, such as Figure 7 As shown, regardless of whether at least one of the second corner 131 and the fourth corner 82 is processed into a chamfered form, a fitting gap can be provided between the second corner 131 and the fourth corner 82. This can reduce the compression of the second corner 131 on the fourth corner 82 to a certain extent, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the fourth corner 82.

[0164] In some embodiments of this application, such as Figure 7 As shown, the first corner 34 and the third corner 81 are chamfered corners with matching shapes; that is, both the first corner 34 and the third corner 81 are chamfered or rounded corners. This facilitates processing and makes it easier to achieve surface contact between the two, or it helps to improve the uniformity of the mating gap between them, thereby reducing the compression of the third corner 81 by the first corner 34, and thus reducing the risk of the insulating sealing structure 8 cracking at the position of the third corner 81. Of course, this 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.

[0165] For example, such as Figure 7 As shown, both the first corner 34 and the third corner 81 are rounded, and the radius of the rounded corner of the first corner 34 is smaller than that of the rounded corner of the third corner 81. This helps to increase the fit gap between the first corner 34 and the third corner 81 while improving the fit tightness, thereby reducing the compression of the third corner 81 by the first corner 34 and reducing the risk of the insulating sealing structure 8 cracking at the position of the third corner 81.

[0166] In some embodiments of this application, such as Figure 7 As shown, the second corner 131 and the fourth corner 82 are chamfered corners with matching shapes; that is, both the second corner 131 and the fourth corner 82 are chamfered or rounded corners. This facilitates processing and makes it easier to achieve surface contact between the two, or it helps to improve the uniformity of the mating gap between the two, thereby reducing the compression of the fourth corner 82 by the second corner 131 and thus reducing the risk of the insulating sealing structure 8 cracking at the location of the fourth corner 82. Of course, this 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.

[0167] For example, such as Figure 11As shown, both the third corner 81 and the fourth corner 82 are chamfered. When the third corner 81 is rounded, the fourth corner 82 is beveled, thus ensuring that the wall thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 is sufficient, thereby improving the insulation sealing reliability of the insulating sealing structure 8. Alternatively, the fourth corner 82 can be rounded, while the third corner 81 can be beveled.

[0168] In some embodiments of this application, such as Figure 11 As shown, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1, and the corner of the housing 1 near 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 that of the second part 84. The first part 83 is positioned relative to the second part 84 near at least one of the first corner 34 and the second corner 131.

[0169] For example, combining Figure 12 and Figure 11 The first part 83 may include at least one of the first sub-part 831 and the second sub-part 832, in combination Figure 12 The first sub-part 831 is positioned closer to the first corner 34 relative to the second part 84. The material hardness of the first sub-part 831 is lower than that of the second part 84. Figure 11 The second sub-part 832 is positioned relative to the second part 84 and closer to the second corner 131. The material hardness of the second sub-part 832 is less than that of the second part 84.

[0170] Thus, when the pole body 3 is assembled and fixed to the housing 1, the position corresponding to the first corner 34 of the insulating sealing structure 8 is prone to cracking. By setting this position as the first sub-part 831 with relatively soft material hardness, the first sub-part 831 is easily deformed by compression and absorbs the force, thereby reducing the risk of cracking at this position. Alternatively, the position corresponding to the second corner 131 of the insulating sealing structure 8 is prone to cracking. By setting this position as the second sub-part 832 with relatively soft material hardness, the second sub-part 832 is easily deformed by compression and absorbs the force, thereby reducing the risk of cracking at this position.

[0171] It is worth noting that the materials of the first part 83 and the second part 84 are not limited and can be selected according to actual requirements. For example, the material of the second part 84 can be an insulating material with higher hardness, such as PPS (polyphenylene sulfide, a new type of high-performance thermoplastic resin) or LCP (liquid crystal polymer), so that the second part 84 has good hardness, plays a supporting role, and allows the compression of the insulating sealing material to be better controlled, thereby improving the sealing performance. The material of the first part 83 can be a compressible rubber or plastic material, such as PFA (perfluoroalkyl), PP (polypropylene), FKM (fluororubber), or EPDM (ethylene propylene diene monomer rubber), so that the first part 83 has good compression deformation performance, thereby effectively improving the cracking problem. In addition, when the first part 83 includes both the first sub-part 831 and the second sub-part 832, the materials of the first sub-part 831 and the second sub-part 832 can be the same or different, and can be set according to the actual situation.

[0172] In some embodiments, such as Figure 13 As shown, the first part 83 includes a first sub-part 831, which is disposed relative to the second part 84 near the first corner 34. The first sub-part 831 defines a portion of the surface of the insulating sealing structure 8 facing the supporting portion 32, and / or defines a portion of the surface of the insulating sealing structure 8 facing the penetrating portion 33. Therefore, the first sub-part 831 is exposed on the outer surface of the insulating sealing structure 8 near the first corner 34, allowing for better compressive deformation under stress, which is more beneficial in mitigating cracking problems at that location. Furthermore, it reduces the difficulty of assembling the first sub-part 831 with the second part 84.

[0173] In some embodiments, such as Figure 14 and Figure 13 As shown, the end of the through portion 33 that is connected to the abutment portion 32 (e.g.) Figure 13 The upper end portion 331 of the through portion 33 shown in the diagram, together with the supporting portion 32, forms the first pole portion 35. The insulating sealing structure 8 includes a first insulating sealing member 85 that fits between the first pole portion 35 and the housing 1. A pad 9 is provided between the first pole portion 35 and the housing 1 to buffer the force applied to the first insulating sealing member 85 by the first pole portion 35 and / or the housing 1. Thus, by providing the pad 9, the force applied to the first insulating sealing member 85 by the first pole portion 35 and / or the reaction force applied to the first insulating sealing member 85 by the housing 1 can be reduced, thereby reducing the damage to the first insulating sealing member 85 and protecting it, thus improving the cracking problem of the first insulating sealing member 85.

[0174] It is worth noting that the placement and cushioning method of the pad 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 housing 1. For example, in some embodiments, such as Figure 14 and Figure 13 As shown, the gasket 9 can be disposed between the housing 1 and the first insulating seal 85, and / or between the first pole post 35 and the first insulating seal 85. That is, the gasket 9 can be disposed at at least once between the housing 1 and the first insulating seal 85, and between the first pole post 35 and the first insulating seal 85. This facilitates the assembly of the gasket 9, reduces production difficulty, and allows the first insulating seal 85 to be a single piece, facilitating its processing and assembly.

[0175] Of course, this application is not limited to this. For example, in other embodiments of this application, the pad 9 can also be placed in other positions. For example, the first insulating seal 85 can be set as a component. In this case, the pad 9 can be placed between multiple components of the first insulating seal 85. The material hardness of the pad 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 housing 1 is applied to the first insulating seal 85, the pad 9 can undergo compression deformation to absorb the force, thereby reducing the damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0176] In some embodiments, refer to Figure 14 The gasket 9 may include a first gasket 91, which is disposed between the supporting portion 32 and the first insulating seal 85. The hardness of the material of the first gasket 91 is not limited to the hardness of the material of the first insulating seal 85. Therefore, when the pole body 3 is installed into the housing 1, when the supporting portion 32 presses the first insulating seal 85 toward the housing 1 (for example, pressing the first insulating seal 85 axially along the mounting hole 12), the first gasket 91, located between the first insulating seal 85 and the supporting portion 32, can reduce a portion of the force, thereby reducing the force transmitted to the first insulating seal 85 and thus reducing damage to the first insulating seal 85, effectively protecting the first insulating seal 85.

[0177] In some embodiments, refer to Figure 14The gasket 9 may include a second gasket 92, which is disposed between the through-hole 33 and the first insulating seal 85. In this case, the hardness of the material of the second gasket 92 is not limited to the hardness of the material of the first insulating seal 85. Therefore, when the pole body 3 is installed into the housing 1, when the through-hole 33 presses the first insulating seal 85 toward the housing 1 (for example, pressing the first insulating seal 85 radially along the mounting hole 12), the second gasket 92, located between the first insulating seal 85 and the through-hole 33, can reduce a portion of the force, thereby reducing the force transmitted to the first insulating seal 85 and minimizing damage to it, thus protecting the first insulating seal 85.

[0178] In some embodiments, refer to Figure 13 The gasket 9 may include a third gasket 93, which is disposed between the first insulating seal 85 and the outer surface of the housing 1. The material hardness of the third gasket 93 is less than that of the first insulating seal 85. Therefore, when the pole body 3 is installed into the housing 1, when the pole body 3 presses the first insulating seal 85 towards the housing 1 (e.g., pressing the first insulating seal 85 along the axial direction of the mounting hole 12), the first insulating seal 85 can transmit the force to the third gasket 93. Since the material hardness of the third gasket 93 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 85. This buffers the force applied to the first insulating seal 85 by the first pole portion 35, reducing damage to the first insulating seal 85 and protecting it.

[0179] 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 it may include all three of the first gasket 91, the second gasket 92, and the third gasket 93 at the same time, thereby protecting the first insulating seal 85 from multiple angles and better reducing the damage caused by the first insulating seal 85.

[0180] In some embodiments, when the pad 9 includes both a first pad 91 and a second pad 92, the first pad 91 and the second pad 92 can be made into a single piece, which helps to reduce the difficulty of installing and fixing the second pad 92, and allows the first pad 91 and the second pad 92 to be installed together, thereby improving the overall assembly efficiency.

[0181] In some embodiments, when the pad 9 does not include the second pad 92, a fitting gap can be provided between the first insulating seal 85 and the through portion 33. In this way, when the pole body 3 is installed into the housing 1, when the through portion 33 presses the first insulating seal 85 toward the housing 1 (for example, pressing the first insulating seal 85 radially along the mounting hole 12), since there is a fitting gap between the first insulating seal 85 and the through portion 33, the through portion 33 is not likely to directly press the first insulating seal 85. This can reduce the force transmitted to the first insulating seal 85, reduce the damage to the first insulating seal 85, and protect the first insulating seal 85.

[0182] It is worth noting that, in the embodiments of this application, in order to protect the first insulating seal 85 and prevent it from cracking under stress, at least two of the above-mentioned measures, such as setting a chamfer, distinguishing the materials of the first part 83 and the second part 84, and setting a pad 9, can be used simultaneously. This can better protect the first insulating seal 85 and improve its cracking and damage under stress.

[0183] It is worth noting that the specific composition of the insulating sealing structure 8 is not limited. For example, in addition to the first insulating sealing element 85 mentioned above, it may also include other insulating sealing elements. In this way, by combining multiple insulating sealing elements, other beneficial technical effects can be taken into account while ensuring the insulating and sealing connection between the pole body 3 and the housing 1.

[0184] For example, in some embodiments, combined with Figure 13 The pole body 3 also includes a flange portion 38 that abuts against the housing 1. The flange portion 38 is connected to the end of the through portion 33 near the receiving cavity 11, and the abutting portion 32 is connected to the end of the through portion 33 away from the receiving cavity 11. The end of the through portion 33 connected to the flange portion 38 (e.g.) Figure 13 The lower end portion 332 of the through portion 33 shown in the figure and the flange portion 38 form the second pole portion 39. The insulating sealing structure 8 includes a second insulating seal 86 that fits between the second pole portion 39 and the housing 1.

[0185] For example, the material hardness of the first insulating seal 85 is greater than that of the second insulating seal 86. The second insulating seal 86 is easier to compress and deform and has a better sealing effect than the first insulating seal 85. However, the heat resistance of the first insulating seal 85 is stronger than that of the second insulating seal 86. For example, the first insulating seal 85 is a plastic part, while the second insulating seal 86 is a rubber part. Therefore, when welding the pole body 3 and the pole cover plate 4, 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 part 32 warps, the compression of the second insulating seal 86 by the flange part 38 will become insufficient, affecting the sealing reliability.

[0186] Additionally, in some embodiments, combined with Figure 15 The insulating sealing structure 8 may further include a third insulating seal 87, which may be disposed between the flange 38 and the housing 1 and abut against the active material coating portion 71 of the cell assembly 7. This not only improves the insulation between the cell assembly 7 and the housing 1, but also enhances 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 omitted, and an insulating bracket (not shown) may be fitted at the end of the active material coating portion 71. The insulating bracket abuts against the inner wall of the housing 1, which helps protect the cell assembly 7 when it is installed onto the housing 1, preventing scratches between the housing 1 and the cell assembly 7. This also improves the insulation between the cell assembly 7 and the housing 1, enhances the stability of the fit between the cell assembly 7 and the housing 1, and further improves the reliability of the battery cell 102.

[0187] In some embodiments, such as Figure 15 As shown, a receiving groove 36 is formed on the pole body 3, which opens in the direction away from the receiving cavity 11. That is, the groove opening of the receiving groove 36 is formed on the side surface of the pole body 3 away from the receiving cavity 11. The sink 31 is arranged around the receiving groove 36 and communicates with the receiving groove 36. The pole body 3 has a connecting hole 37, which penetrates the side wall of the receiving groove 36 near the receiving cavity 11 and connects the receiving cavity 11 and the receiving groove 36.

[0188] Therefore, when electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving tank 36 and then flow towards the receiving cavity 11 through the connecting hole 37. The receiving tank 36 can buffer the electrolyte to improve problems such as splashing and overflow. Moreover, the sidewall of the receiving tank 36 (i.e., the tank wall extending from the opening of the receiving tank 36 towards the receiving cavity 11) can block electrolyte splashing to a certain extent, reducing electrolyte contamination to the outside and facilitating rapid electrolyte injection. Furthermore, since there is no need to separately open an injection channel on the housing 1, no special processing is required for the housing 1, which helps to reduce the structural complexity and processing difficulty of the housing 1.

[0189] For example, such as Figure 15 As shown, the pole body 3 includes a through portion 33 that passes through the mounting hole 12, and the through portion 33 is formed in an annular shape. The receiving groove 36 is located in the inner annular region of the through portion 33. For example, the receiving groove 36 can be defined by the through portion 33 and the support portion located in the inner annular region of the through portion 33. When the side of the recessed groove 31 near the central axis L of the mounting hole 12 is open, the recessed groove 31 can communicate with the inner annular region of the through portion 33, that is, with the receiving groove 36. Therefore, when the pole cover plate 4 is covered onto the pole body 3, the fit between the pole cover plate 4 and the pole body 3 can be improved, and the cover plate body 42 of the pole cover plate 4 and the connecting portion 41 do not need to be connected by a concave-convex structure, so that the cover plate body 42 can be embedded in the receiving groove 36. This improves the fit between the pole body 3 and the pole cover plate 4, enhances the connection reliability between the cover plate body 42 of the pole cover plate 4 and the connecting portion 41, and simplifies the structure of the pole cover plate 4.

[0190] In some embodiments, such as Figure 15 As shown, the battery cell 102 includes a cell assembly 7, which includes an active material coating portion 71 housed in a receiving cavity 11 and a conductive portion 72 connected to the active material coating portion 71. The conductive portion 72 passes through a connecting hole 37 to be at least partially housed in a receiving groove 36.

[0191] It is worth noting that there can be one or more connecting holes 37, and the conductive part 72 can be disposed in at least one of the connecting holes 37. For example, at least one connecting hole 37 can be used for electrolyte passage. For example, at least one connecting hole 37 is left unused (i.e., the conductive part 72 is not disposed there), so that the electrolyte can pass through without being obstructed by the conductive part 72. Or, for example, at least one connecting hole 37 can still be used for electrolyte passage even after the conductive part 72 is disposed there.

[0192] Therefore, by housing at least a portion of the conductive part 72 within the receiving groove 36, the conductive part 72 occupies at least a portion of the space within the receiving groove 36, thereby reducing the space occupied by the conductive part 72 within the receiving cavity 11. This saves space within the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, which is beneficial for increasing the energy density of the battery cell 102, or for reducing the size of the battery cell 102 while keeping the energy density of the battery cell 102 constant.

[0193] It is understood that the active material coating part 71 may include a current collector coated with an active material layer, and the conductive part 72 may only include a tab, or it may include a tab and an adapter piece electrically connected to the tab, etc. There are no limitations here.

[0194] In some embodiments, the conductive portion 72 is welded to the electrode body 3 to form an electrical connection, thereby enabling the cell assembly 7 to output from the electrode at the electrode body 3. For example, as... Figure 15 As shown, the conductive part 72 is welded to the side wall of the receiving groove 36 near the receiving cavity 11, thereby improving the fit and facilitating the welding operation. Of course, this application is not limited to this. In other embodiments, the conductive part 72 can also be welded to the pole cover plate 4 to form an electrical connection, which is not limited here.

[0195] In some embodiments, such as Figure 16 and Figure 15 As shown, the terminal cover plate 4 has an injection hole 43 that communicates with the receiving groove 36. The battery cell 102 also includes a sealing structure 6 for sealing the injection hole 43. Thus, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43, or the sealing structure 6 is in an open state, allowing electrolyte to be injected into the receiving groove 36 through the injection hole 43. After injection, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a closed state, thereby sealing and closing the injection hole 43 to prevent electrolyte overflow and to prevent external foreign objects from entering the receiving cavity 11 through the injection hole 43, thereby improving the reliability of the battery cell 102.

[0196] Therefore, by machining the liquid injection hole 43 on the terminal cover plate 4, the opening is relatively small and located on the outside, and the liquid injection inlet can be reliably sealed by the sealing structure 6, thereby improving the working reliability of the battery cell 102. Moreover, the sealing structure 6 can be designed in a flexible and diverse manner.

[0197] In some embodiments, such as Figure 16 and Figure 17As shown, the electrode cap 4 does not have a portion that stops the sealing structure 6 on the outside (i.e., the side away from the receiving cavity 11), so that the sealing structure 6 is suitable for installation onto the electrode cap 4 from the outside (i.e., the side away from the receiving cavity 11). Thus, by configuring the sealing structure 6 to be installed onto the electrode cap 4 from the outside to seal the injection hole 43, the sealing structure 6 can be installed after injection, ensuring the sealing of the injection hole 43. Furthermore, the installation position is close to the outside, facilitating quick assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 does not adversely affect the connection between the electrode body 3 and the electrode cap 4, ensuring the reliability of the connection between the electrode cap 4 and the electrode body 3.

[0198] The sealing structure 6 can be either detachable or fixed. For example, as shown... Figure 16 As shown, when the sealing structure 6 is detachable, it facilitates the maintenance of the injection port 43. For example, when electrolyte needs to be added, the sealing structure 6 can be removed, the injection port 43 opened, and electrolyte injected into the receiving cavity 11 through the injection port 43. Then, the sealing structure 6 can be reinstalled. For example, it can be detachably connected to the electrode cover plate 4 using threads or screws, thus facilitating disassembly and assembly. For example, as... Figure 16 As shown, when the sealing structure 6 is a non-removable fixed form, it can be fixed to the pole cap plate 4 by welding, riveting or other methods, thereby improving the sealing reliability of the sealing structure 6 to the injection hole 43.

[0199] In some embodiments of this application, such as Figure 15 As shown, at least a portion of the sealing structure 6 is embedded within the injection hole 43. That is, the sealing structure 6 can be entirely embedded within the injection hole 43, or only a portion of it can be embedded within the injection hole 43. This allows for full utilization of the space within the injection hole 43, improving the sealing reliability of the sealing structure 6. Furthermore, it reduces the height of the sealing structure 6 protruding beyond the injection hole 43, minimizing its impact on the space outside the electrode cover plate 4. This helps reduce interference with the manifold component 103, increases the connection area between the manifold component 103 and the electrode cover plate 4, and improves flow efficiency.

[0200] In some embodiments of this application, such as Figure 16 and Figure 15As shown, the sealing structure 6 includes a first sealing element 61 and a second sealing element 62. At least a portion of the first sealing element 61 is embedded in the injection hole 43 and is press-fitted with the injection hole 43 to seal it. The second sealing element 62 is located on the side of the first sealing element 61 away from the receiving cavity 11, and the edge of the second sealing element 62 is welded to the pole cap plate 4 for sealing. Thus, the first sealing element 61 can effectively seal the injection hole 43, and the second sealing element 62 can not only seal the injection hole 43, but also prevent the first sealing element 61 from falling out of the injection hole 43, thereby improving the sealing reliability of the sealing structure 6 for the injection hole 43.

[0201] For example, the first sealing element 61 can be made of plastic, rubber, or other materials, which facilitates interference fit and improves sealing performance. For example, the second sealing element 62 can be made of the same metal material as the pole cap 4, such as aluminum, which helps improve the welding yield between the second sealing element 62 and the pole cap 4. Furthermore, it is worth noting that the welding method between the second sealing element 62 and the pole cap 4 is not limited; for example, it can be hot-melt welding or brazing. For example, pulsed laser welding can be used to improve manufacturing efficiency and automation.

[0202] It is worth noting that laser welding requires a high degree of cleanliness in the injection hole 43. If there is residual electrolyte in the injection hole 43, the electrolyte is easily vaporized by heat, and the waste gas generated by vaporization will rush out of the weld pool, causing defects such as pinholes and bursts at the weld. In some embodiments of this application, combined with Figure 15 The injection hole 43 includes a first section 431, a second section 432, and a third section 433 arranged sequentially along the injection flow direction. The flow area of ​​the first section 431 gradually decreases from the first section 431 to the second section 432. The flow area at the outlet end of the first section 431 is greater than or equal to the flow area at the inlet end of the second section 432. The flow area of ​​the second section 432 gradually decreases from the second section 432 to the third section 433. The flow area at the outlet end of the second section 432 is equal to the flow area at the inlet end of the third section 433. The third section 433 is a section with a constant cross-section. The first sealing element 61 is interference-fitted with the third section 433. This improves the problem of liquid accumulation in the first section 431 and the second section 432 of the injection hole 43, thereby improving the welding yield of the second sealing element 62 and the electrode cap plate 4, and enhancing the sealing performance. Of course, this application is not limited to this. For example, in other embodiments of this 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, etc.

[0203] Alternatively, in some embodiments, the second seal 62 can be configured to be detachably connected to the pole cap 4 by means of a screw fastener, so as to restrict the first seal 61 to a position that is interference-fitted with the injection hole 43.

[0204] In some embodiments of this application, such as Figure 6 As shown, the housing 1 includes a first housing wall 13, and a mounting hole 12 is formed in the first housing wall 13. The first housing wall 13 is an integrally formed cover plate, or, as... Figure 18 As shown, the housing 1 includes a second housing wall 14, with the first housing wall 13 integrally formed with at least one second housing wall 14, and the second housing wall 14 extending toward one side of the first housing wall 13 in the thickness direction. This allows for flexible design of the electrode post 2's structural position, thereby increasing the applicability of the battery cell 102 in this embodiment.

[0205] It is worth noting that the second shell wall 14 can extend from the 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, the first shell wall 13 may have only one edge extending into the second shell wall 14, or it may have only two edges extending into the second shell wall 14, or it may have three edges extending into the second shell wall 14, or all four edges extending into the second shell wall 14. For example, when the shell 1 is a rectangular shell, any wall of the rectangular shell can serve as the first shell wall 13.

[0206] 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 disposed on the open side of the shell body to form a receiving cavity 11 between the shell body and the cover plate. In this case, the side wall of the shell body opposite to the cover plate is the first shell wall 13, and the wall of the shell body connecting the first shell wall 13 and the cover plate is the second shell wall 14. Alternatively, the side wall of the shell body opposite to the cover plate is the second shell wall 14, and the wall of the shell body connecting 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.

[0207] According to a second aspect of this application, a battery cell 102 is provided. The battery cell 102 may include: a housing 1, a terminal body 3, and a terminal cover plate 4. The housing 1 has a mounting hole 12 and a receiving cavity 11 is defined inside the housing 1. The terminal body 3 includes a through portion 33 that passes through 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 through portion 33 and extends in a direction away from the central axis L of the mounting hole 12 relative to the through portion 33. A recess 31 that opens in a direction away from the receiving cavity 11 is formed between the supporting portion 32 and the through portion 33. The terminal cover plate 4 covers the terminal body 3. The edge of the terminal cover plate 4 is disposed in the recess 31 and is welded through the through portion 33. The welded structure 5 formed by the welding is spaced apart from the supporting portion 32.

[0208] For example, the edge of the pole cover plate 4 has a connecting part 41, which is welded to the pole body 3 to form a welded structure 5. When the welded structure 5 is formed, the shrinkage stress generated by the solidification of the molten pool can be blocked by the spaced position, making it difficult or less likely to be transmitted to the supporting part 32, thereby improving the problem of the supporting part 32 warping.

[0209] It is worth noting that, where there is no contradiction, the embodiments according to the first aspect of this application can be combined with the embodiments according to the second aspect of this application. For example, in the second aspect of this application, the following technical solutions can be combined, and the technical effects of the following technical solutions can be referred to the description of the embodiments of the first aspect above, and therefore will not be repeated.

[0210] For example, in some embodiments, the through portion 33 is formed as an annular shape, and the maximum radial width of the welded structure 5 is less than the radial wall thickness D1 of the through portion 33.

[0211] For example, in some embodiments, the depth H3 of the groove 31 in the axial direction of the mounting hole 12 is one-third to two-thirds of the thickness H1 of the abutment 32 in the axial direction of the mounting hole 12.

[0212] For example, in some embodiments, the through portion 33 is formed as an annular shape, and the side of the recess 31 near the central axis L of the mounting hole 12 is open to communicate with the inner annular region of the through portion 33.

[0213] For example, in some embodiments, the supporting part 32 includes a first segment 321 and a second segment 322 arranged sequentially along the direction away from the through part 33, with the surface perpendicular to the axis of the mounting hole 12 as the projection surface and the axis of the mounting hole 12 as the projection direction. The projection of the first segment 321 on the projection surface is located inside 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.

[0214] For example, in some embodiments, the pole body 3 is formed into a retaining portion 32 by flanging and riveting.

[0215] For example, in some embodiments, the distance between the welded structure 5 and the supporting portion 32 gradually increases along the direction away from the receiving cavity 11.

[0216] For example, in some embodiments, the cross-sectional area of ​​the settling tank 31 gradually increases along the direction away from the receiving cavity 11.

[0217] For example, in some embodiments, the pole cover plate 4 includes a cover plate body 42, and the edge of the cover plate body 42 is provided with a connecting part 41. The connecting part 41 is welded to the pole body 3 to form a welded structure 5. Before welding, the side surface of the cover plate body 42 away from the receiving cavity 11 protrudes from the side surface of the connecting part 41 away from the receiving cavity 11 in the direction away from the receiving cavity 11.

[0218] For example, in some embodiments, the thickness H1 of the abutment portion 32 in the axial direction of the mounting hole 12 is greater than the thickness of the welded structure 5 in the axial direction of the mounting hole 12.

[0219] For example, in some embodiments, the thickness of the welded structure 5 in the axial direction of the mounting hole 12 is three-quarters to five-quarters of the depth H3 of the groove 31 in the axial direction of the mounting hole 12.

[0220] For example, in some embodiments, the pole cover plate 4 includes a cover plate body 42, and the edge of the cover plate body 42 is provided with a connecting part 41. The connecting part 41 is welded to the pole body 3 to form a welded structure 5. Before welding, the surface of the connecting part 41 away from the receiving cavity 11 extends obliquely towards the receiving cavity 11 along the direction away from the central axis L of the mounting hole 12.

[0221] For example, in some embodiments, the battery cell 102 further includes an insulating sealing structure 8 for insulatingly sealing the housing 1 and the terminal body 3. The insulating sealing structure 8 includes a portion disposed between the through portion 33 and the housing 1 and a portion disposed between the abutment portion 32 and the housing 1.

[0222] For example, in some embodiments, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1, and the corner of the housing 1 near the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 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.

[0223] For example, in some embodiments, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1, and the corner of the housing 1 near the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 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.

[0224] For example, in some embodiments, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1, and the corner of the housing 1 near 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 that of the second part 84. The first part 83 is positioned relative to the second part 84 near at least one of the first corner 34 and the second corner 131.

[0225] For example, in some embodiments, the first portion 83 includes a first sub-portion 831 disposed 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 abutment portion 32 and / or defines a portion of the surface of the insulating sealing structure 8 facing the penetration portion 33.

[0226] For example, in some embodiments, the end of the through portion 33 connected to the abutment portion 32 forms a first pole portion 35 with the abutment portion 32, and the insulating sealing structure 8 includes a first insulating sealing member 85 that fits between the first pole portion 35 and the housing 1, and a pad 9 is provided between the first pole portion 35 and the housing 1 to buffer the force applied by the first pole portion 35 to the first insulating sealing member 85.

[0227] For example, in some embodiments, the pad 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.

[0228] 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 disposed between the supporting portion 32 and the first insulating seal 85, the second gasket 92 is disposed between the through portion 33 and the first insulating seal 85, and the third gasket 93 is disposed between the first insulating seal 85 and the housing 1, and the material hardness of the third gasket 93 is less than the material hardness of the first insulating seal 85.

[0229] For example, in some embodiments, the pole body 3 has a receiving groove 36 that opens in the direction away from the receiving cavity 11, the sink 31 is arranged around the receiving groove 36 and communicates with the receiving groove 36, the pole body 3 has a connecting hole 37 that penetrates the side wall of the receiving groove 36 near the receiving cavity 11 and connects the receiving cavity 11 and the receiving groove 36.

[0230] For example, in some embodiments, the battery cell 102 includes a cell assembly 7, which includes an active material coating portion 71 housed in a receiving cavity 11 and a conductive portion 72 connected to the active material coating portion 71. The conductive portion 72 passes through a connecting hole 37 to be at least partially housed in a receiving groove 36.

[0231] For example, in some embodiments, the terminal cover plate 4 has an injection hole 43 that can communicate with the receiving groove 36, and the battery cell 102 also includes a sealing structure 6 for sealing the injection hole 43.

[0232] According to a third aspect of this application, a battery cell 102 is proposed, combined with... Figure 19 The battery cell 102 includes: a housing 1, a terminal body 3, and a terminal cover plate 4. The housing 1 has a mounting hole 12. The terminal body 3 passes through the mounting hole 12 and includes a supporting part 32 that abuts against the outside of the housing 1. The terminal cover plate 4 covers the terminal body 3 and includes a connecting part 41 that connects to the terminal body 3. The projection plane is a plane perpendicular to the axis of the mounting hole 12, and the projection direction is the axis of the mounting hole 12. The projection of the part of the supporting part 32 that abuts against the housing 1 on the projection plane is spaced apart from the projection of the connecting part 41 on the projection plane.

[0233] It is worth noting that the part of the abutting part 32 that abuts against the housing 1 refers to the part of the abutting part 32 that directly or indirectly contacts the housing 1. For example, the housing 1 includes a first housing wall 13, and a mounting hole 12 is formed on the first housing wall 13. With the axial direction of the mounting hole 12 as the projection direction and the surface perpendicular to the axial direction of the mounting hole 12 as the projection surface, the projection of the abutting part 32 on the projection surface and the projection of the first housing wall 13 on the projection surface have an intersection area. The part of the abutting part 32 corresponding to the intersection area directly or indirectly contacts the housing 1, which is the part of the abutting part 32 that abuts against the housing 1.

[0234] Therefore, in the third aspect embodiment of this application, compared with the first and second aspects embodiments described above, the groove 31 may not be provided on the pole body 3. By setting the projection of the part of the supporting part 32 that abuts against the housing 1 on the projection surface to be spaced apart from the projection of the connecting part 41 on the projection surface, the force generated by the connection between the connecting part 41 and the pole body 3 can be reduced to be transmitted to the part of the supporting part 32 that abuts against the housing 1, thereby improving the problem of the lifting of the part of the supporting part 32 that abuts against the housing 1.

[0235] It is worth noting that, without considering the settling tank 31 and without contradiction, the embodiments according to the first aspect of this application can be combined with the embodiments according to the third aspect of this application. For example, in the third aspect of this application, the following technical solutions can be combined, and the technical effects of the following technical solutions can be referred to the description of the embodiments of the first aspect above, so they will not be repeated here.

[0236] For example, in some embodiments, the pole body 3 includes a through portion 33 that passes through the mounting hole 12. A supporting portion 32 is connected to the through portion 33 and extends relative to the through portion 33 in a direction away from the central axis L of the mounting hole 12. A portion of the projection of the supporting portion 32 on the projection surface is located within the projection range of the mounting hole 12 on the projection surface. Thus, the remaining portion of the projection of the supporting portion 32 on the projection surface is located outside the projection range of the mounting hole 12 on the projection surface, thereby achieving abutment against the housing 1. The projection of the connecting portion 41 on the projection surface is located within the projection range of the through portion 33 on the projection surface. The connecting portion 41 is provided on and connected to the through portion 33. Therefore, the connecting portion 41 can be further moved away from the portion of the supporting portion 32 that abuts against the housing 1, thereby further improving the problem of the lifting of the portion of the supporting portion 32 that abuts against the housing 1.

[0237] For example, in some embodiments, the connecting portion 41 is welded to the through portion 33. Alternatively, in other embodiments, the connecting portion 41 and the through portion 33 may be connected by adhesive or fasteners.

[0238] For example, in some embodiments, the edge of the pole cover plate 4 is formed as a connecting portion 41.

[0239] For example, in some embodiments, the through portion 33 is formed as an annular 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 through portion 33.

[0240] For example, in some embodiments, the pole body 3 is formed into a retaining portion 32 by flanging and riveting.

[0241] For example, in some embodiments, the pole cover plate 4 includes a cover plate body 42, a connecting portion 41 located at the edge of the cover plate body 42, and the side surface of the cover plate body 42 away from the receiving cavity 11 protrudes from the side surface of the connecting portion 41 away from the receiving cavity 11 in a direction away from the receiving cavity 11.

[0242] For example, in some embodiments, the surface of the connecting portion 41 away from the receiving cavity 11 extends obliquely toward the receiving cavity 11 along the direction away from the central axis L of the mounting hole 12.

[0243] For example, in some embodiments, the battery cell 102 further includes an insulating sealing structure 8 for insulatingly sealing the housing 1 and the terminal body 3. The insulating sealing structure 8 includes a portion disposed between the through portion 33 and the housing 1 and a portion disposed between the abutment portion 32 and the housing 1.

[0244] For example, in some embodiments, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1, and the corner of the housing 1 near the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 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.

[0245] For example, in some embodiments, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1, and the corner of the housing 1 near the first corner 34 is a second corner 131. The insulating sealing structure 8 includes a third corner 81 corresponding to the first corner 34 and a fourth corner 82 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.

[0246] For example, in some embodiments, the connection between the supporting part 32 and the through part 33 has a first corner 34 facing the housing 1, and the corner of the housing 1 near 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 that of the second part 84. The first part 83 is positioned relative to the second part 84 near at least one of the first corner 34 and the second corner 131.

[0247] For example, in some embodiments, the first portion 83 includes a first sub-portion 831 disposed 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 abutment portion 32 and / or defines a portion of the surface of the insulating sealing structure 8 facing the penetration portion 33.

[0248] For example, in some embodiments, the end of the through portion 33 connected to the abutment portion 32 forms a first pole portion 35 with the abutment portion 32, and the insulating sealing structure 8 includes a first insulating sealing member 85 that fits between the first pole portion 35 and the housing 1, and a pad 9 is provided between the first pole portion 35 and the housing 1 to buffer the force applied by the first pole portion 35 to the first insulating sealing member 85.

[0249] For example, in some embodiments, the pad 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.

[0250] 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 disposed between the supporting portion 32 and the first insulating seal 85, the second gasket 92 is disposed between the through portion 33 and the first insulating seal 85, and the third gasket 93 is disposed between the first insulating seal 85 and the housing 1, and the material hardness of the third gasket 93 is less than the material hardness of the first insulating seal 85.

[0251] For example, in some embodiments, the pole body 3 has a receiving groove 36 that opens in the direction away from the receiving cavity 11, the supporting part 32 is arranged around the receiving groove 36, the pole body 3 has a connecting hole 37 that penetrates the side wall of the receiving groove 36 near the receiving cavity 11 and connects the receiving cavity 11 and the receiving groove 36.

[0252] For example, in some embodiments, the battery cell 102 includes a cell assembly 7, which includes an active material coating portion 71 housed in a receiving cavity 11 and a conductive portion 72 connected to the active material coating portion 71. The conductive portion 72 passes through a connecting hole 37 to be at least partially housed in a receiving groove 36.

[0253] For example, in some embodiments, the terminal cover plate 4 has an injection hole 43 that can communicate with the receiving groove 36, and the battery cell 102 also includes a sealing structure 6 for sealing the injection hole 43.

[0254] According to a fourth aspect of this application, this application also provides a battery 100, including a battery cell 102 of any of the above-described embodiments. It is worth noting that the battery 100 according to this application embodiment may or may not include a casing. Therefore, since the reliability of the battery cell 102 according to this application embodiment is improved, it is beneficial to improve the performance of the battery 100.

[0255] For example, such as Figures 3-8 As shown, the battery 100 may further include a busbar component 103, and multiple battery cells 102, with at least two connected electrically through the busbar component 103. This allows for the series connection and / or parallel connection of multiple battery cells 102. For example, when multiple battery cells 102 are connected in series, the anode terminal plate 4 of one battery cell 102 is connected to the cathode terminal plate 4 of the next battery cell 102 through a busbar component 103, while the cathode terminal plate 4 of the same battery cell 102 is connected to the anode terminal plate 4 of the previous battery cell 102 through another busbar component 103.

[0256] According to a fifth aspect embodiment of this application, this application also provides an electrical device including a battery 100 of any of the above-described embodiments, the battery 100 being used to provide electrical energy to the electrical device. The electrical device can be any of the aforementioned devices or systems using the battery 100. Because the performance of the battery 100 is improved, it is beneficial to improve the power consumption performance of the electrical device.

[0257] The following describes a specific embodiment of a battery cell 102 according to this application.

[0258] Reference Figures 3-8 The battery cell 102 includes a housing 1, a terminal body 3, a terminal cover plate 4, and a cell assembly 7. The housing 1 has a mounting hole 12, and a receiving cavity 11 is defined within the housing 1. The terminal body 3 passes through the mounting hole 12 and includes a through portion 33 passing through the mounting hole 12 and a supporting portion 32 abutting against the outside of the housing 1. The supporting portion 32 is connected to the through portion 33 and extends relative to the through portion 33 in a direction away from the central axis L of the mounting hole 12. The supporting portion 32 protrudes from the through portion 33 in a direction away from the receiving cavity 11, defining a groove 31 between the surface of the supporting portion 32 near the central axis L of the mounting hole 12 and the surface of the through portion 33 away from the receiving cavity 11. An insulating sealing structure 8 is provided between the housing 1 and the terminal body 3 to provide an insulating and sealed fit between the housing 1 and the terminal body 3.

[0259] Reference Figures 3-8 The pole cover plate 4 is placed on the pole body 3, and the pole cover plate 4 includes a cover plate body 42 and a connecting part 41. The connecting part 41 is located at the edge of the cover plate body 42. The connecting part 41 is disposed on the through part 33 and welded to the through part 33. After welding, the connecting part 41 can form a solidified structure formed by the solidification of the molten pool. This solidified structure is separated from the side wall of the settling tank 31 near the supporting part 32.

[0260] In the embodiments of this application, since the connecting part 41 is welded to the through part 33, and the connecting part 41 is separated from the supporting part 32 after the molten pool solidifies, the shrinkage stress generated by the solidification of the molten pool can be blocked, and it is difficult or less likely to be transmitted to the supporting part 32. This can improve the problem of the lifting of the supporting part 32, thereby improving the reliability of the supporting part 32 and the housing 1. It can also make the compression of the insulating sealing structure 8 meet the requirements, improve the sealing between the pole body 3 and the housing 1, and effectively improve the connection reliability and sealing tightness between the pole body 3 and the housing 1. Therefore, it can improve the reliability of the battery cell 102.

[0261] Furthermore, since the problem of the support portion 32 being warped can be improved, it helps to alleviate the problem of the support portion 32 being warped, which affects the assembly and connection of the busbar component 103, and improves the smoothness and reliability of the connection between the busbar component 103 and the pole post cover plate 4. In addition, since the connection portion 41 connecting the pole post cover plate 4 and the pole post body 3 is spaced apart from the side wall of the groove 31 near the support portion 32, the assembly clearance requirement between the pole post cover plate 4 and the pole post body 3 can be reduced, the machining accuracy requirement of the pole post cover plate 4 can be reduced, and the compatibility of the pole post body 3 can be increased.

[0262] Reference ​ The through-hole 33 is formed in an annular shape, and the receiving groove 36 is located in the inner annular region of the through-hole 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 electrode body 3 has a connecting hole 37, which penetrates the side wall of the receiving groove 36 near the receiving cavity 11 and connects the receiving cavity 11 and the receiving groove 36. The battery cell assembly 7 includes an active material coating part 71 and a conductive part 72. The active material coating part 71 is housed in the receiving cavity 11, and the conductive part 72 connects the active material coating part 71 and the electrode body 3. The conductive part 72 passes through the connecting hole 37 to be at least partially housed in the receiving groove 36, and the portion of the conductive part 72 located in the receiving groove 36 is connected to the electrode body 3.

[0263] Therefore, by housing at least a portion of the conductive part 72 within the receiving groove 36, the conductive part 72 occupies at least a portion of the space within the receiving groove 36, thereby reducing the space occupied by the conductive part 72 within the receiving cavity 11. This saves space within the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, which is beneficial for increasing the energy density of the battery cell 102, or for reducing the size of the battery cell 102 while keeping the energy density of the battery cell 102 constant.

[0264] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other.

[0265] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A battery cell, characterized in that, include: A housing having mounting holes, wherein a receiving cavity is defined within the housing; The electrode body passes through the mounting hole and includes a supporting portion that abuts against the outside of the housing. A groove is formed at the end of the electrode body away from the receiving cavity. The groove is positioned relative to the supporting portion and close to the central axis of the mounting hole. An electrode cover plate is provided on the electrode body and includes a connecting portion connected to the electrode body. The connecting portion is located in the sink and connected to the portion of the electrode body located in the sink near the receiving cavity side, and is spaced apart from the sink wall near the supporting portion.

2. The battery cell according to claim 1, characterized in that, The connecting part is welded to the portion of the pole body located in the sink near the receiving cavity.

3. The battery cell according to any one of claims 1-2, characterized in that, The pole body includes a through portion passing through the mounting hole, and at least a portion of the connecting portion is disposed on the through portion and connected to the through portion.

4. The battery cell according to claim 3, characterized in that, The through-hole is formed in a ring shape, and the radial width of the connecting part covering the pole body is smaller than the radial wall thickness of the through-hole.

5. The battery cell according to claim 3 or 4, characterized in that, The abutting portion is connected to the through portion and extends relative to the through portion in a direction away from the central axis of the mounting hole. The abutting portion protrudes from the through portion in a direction away from the receiving cavity, thereby defining the groove between the surface of the abutting portion near the central axis of the mounting hole and the surface of the through portion away from the receiving cavity.

6. The battery cell according to claim 5, characterized in that, The depth of the groove in the axial direction of the mounting hole is one-third to two-thirds of the thickness of the abutment in the axial direction of the mounting hole.

7. The battery cell according to any one of claims 3-6, characterized in that, The through-hole is formed in a ring shape, and the side of the groove near the central axis of the mounting hole is open to communicate with the inner ring area of ​​the through-hole.

8. The battery cell according to any one of claims 3-7, characterized in that, The supporting portion includes a first segment and a second segment arranged sequentially along a direction away from the through portion. The projection surface is a plane perpendicular to the axis of the mounting hole, and the projection direction is the axis of the mounting hole. The projection of the first segment on the projection surface is located within the projection of the mounting hole on the projection surface, and the projection of the second segment on the projection surface is located outside the projection of the mounting hole on the projection surface.

9. The battery cell according to any one of claims 1-8, characterized in that, The pole body is formed into the supporting part by flanging and riveting.

10. The battery cell according to any one of claims 1-9, characterized in that, The distance between the connecting part and the side wall of the sink near the supporting part gradually increases in the direction away from the receiving cavity.

11. The battery cell according to any one of claims 1-10, characterized in that, The cross-sectional area of ​​the settling tank gradually increases in the direction away from the receiving cavity.

12. The battery cell according to any one of claims 1-11, characterized in that, The pole cover plate includes a cover plate body, the connecting portion is located at the edge of the cover plate body, and the side surface of the cover plate body away from the receiving cavity protrudes from the side surface of the connecting portion away from the receiving cavity.

13. The battery cell according to any one of claims 1-12, characterized in that, The thickness of the abutment 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 1-13, characterized in that, The thickness of the connecting part in the axial direction of the mounting hole is three-quarters to five-quarters of the depth of the countersink in the axial direction of the mounting hole.

15. The battery cell according to any one of claims 1-14, characterized in that, The surface of the connecting portion away from the receiving cavity extends obliquely toward the receiving cavity along a direction away from the central axis of the mounting hole.

16. The battery cell according to any one of claims 1-15, characterized in that, The electrode post body includes a through portion passing through the mounting hole, the abutting portion being connected to the through portion and extending relative to the through portion in a direction away from the central axis of the mounting hole, and the battery cell also includes an insulating sealing structure for insulatingly sealing the housing and the electrode post body, the insulating sealing structure including a portion disposed between the through portion and the housing and a portion disposed between the abutting portion and the housing.

17. The battery cell according to claim 16, characterized in that, The connection between the supporting part and the through part has a first corner facing the housing, and the corner of the housing near the first corner is a second corner. The insulating sealing structure includes a third corner corresponding to the first corner and a fourth corner corresponding to the second corner. 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, characterized in that, The connection between the supporting part and the through part has a first corner facing the housing, and the corner of the housing near the first corner is a second corner. The insulating sealing structure includes a third corner corresponding to the first corner and a fourth corner 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 16-18, characterized in that, The connection between the supporting part and the through part has a first corner facing the housing, and the corner of the housing near 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 that of the second part. The first part is positioned relative to the second part near at least one of the first corner and the second corner.

20. The battery cell according to claim 19, characterized in that, The first portion includes a first sub-part disposed relative to the second portion near the first corner. The first sub-part defines a portion of the insulating sealing structure facing the abutment and / or a portion of the insulating sealing structure facing the penetration portion.

21. The battery cell according to any one of claims 16-20, characterized in that, The end of the through portion connected to the abutment portion forms a first pole portion with the abutment portion. The insulating sealing structure includes a first insulating sealing member that fits between the first pole portion and the housing. A pad is provided between the first pole portion and the housing to buffer the force applied by the first pole portion and / or the housing to the first insulating sealing member.

22. The battery cell according to claim 21, characterized in that, The gasket is disposed 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, characterized in that, The gasket includes at least one of a first gasket, a second gasket, and a third gasket. The first gasket is disposed between the supporting portion and the first insulating seal, the second gasket is disposed between the through portion and the first insulating seal, and the third gasket is disposed between the first insulating seal and the outer surface of the housing, wherein the material hardness of the third gasket is less than that of the first insulating seal.

24. The battery cell according to any one of claims 1-23, characterized in that, The electrode body has a receiving groove that opens away from the receiving cavity. The sink is arranged around the receiving groove and communicates with the receiving groove. The electrode body has a connecting hole that penetrates the side wall of the receiving groove near the receiving cavity and connects the receiving cavity and the receiving groove.

25. The battery cell according to claim 24, characterized in that, The battery cell includes a cell assembly, which includes an active material coating portion housed in the receiving cavity and a conductive portion connected to the active material coating portion. The conductive portion passes through the connecting hole to be at least partially housed in the receiving groove.

26. The battery cell according to claim 24 or 25, characterized in that, The electrode cap plate has an injection hole that can communicate with the receiving groove, and the battery cell also includes a sealing structure for sealing the injection hole.

27. A single battery cell, characterized in that, include: A housing having mounting holes, wherein a receiving cavity is defined within the housing; The pole body includes a through portion passing through the mounting hole and a support portion abutting against the outside of the housing. The support portion is connected to the through portion and extends relative to the through portion in a direction away from the central axis of the mounting hole. A recess is formed between the support portion and the through portion, opening in a direction away from the receiving cavity. An electrode cover plate is placed on the electrode body. The edge of the electrode cover plate is located in the sink groove and is welded through the through part. The welded structure formed by the welding is spaced apart from the supporting part.

28. A single battery cell, characterized in that, include: The housing has mounting holes; The pole body passes through the mounting hole and includes a supporting portion that abuts against the outside of the housing; An electrode cover plate is provided on the electrode body and includes a connecting part connected to the electrode body. The projection plane is a plane perpendicular to the axis of the mounting hole, and the projection direction is the axis of the mounting hole. The projection of the part of the abutting part that abuts against the housing on the projection plane is spaced apart from the projection of the connecting part on the projection plane.

29. The battery cell according to claim 28, characterized in that, The pole body includes a through portion passing through the mounting hole, a supporting portion connected to the through portion and extending relative to the through 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 surface is 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 through portion on the projection surface, and the connecting portion is disposed on the through portion and connected to the through portion.

30. A battery, characterized in that, Includes the battery cell according to any one of claims 1-29.

31. An electrical device, characterized in that, Includes the battery according to claim 30.

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