Battery cell, battery, and electric device

Abstract

A battery cell, a battery, and an electric device, relating to the technical field of batteries. The battery cell comprises: a first shell wall, a pole, a first insulating seal, and a pad, wherein the pole comprises a penetration part and a first extension part, the first extension part extends to the outer side of the outer surface of or the inner side of the inner surface of the first shell wall, the penetration part and the first extension part constitute a first pole part, the first insulating seal is matched between the first pole part and the first shell wall, and the pad is arranged between the first pole part and the first shell wall and used for buffering the acting force applied to the first insulating seal by at least one of the first pole part and the first shell wall.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311203218.2 and application date 2023-09-18, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

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

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

[0005] Summary of the Invention

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

[0007] In the first aspect, an embodiment of the present application provides a battery cell, comprising a first shell wall, a pole, a first insulating seal and a gasket, wherein the first shell wall has a mounting hole, the pole comprises a penetration portion penetrated in the mounting hole, and a first extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the first extension portion extends to the outside of the outer surface or the inside of the inner surface of the first shell wall, the penetration portion and the first extension portion constitute a first pole portion, the first insulating seal is fitted between the first pole portion and the first shell wall, the gasket is arranged between the first pole portion and the first shell wall, and is used to buffer the force applied to the first insulating seal by at least one of the first pole portion and the first shell wall.

[0008] In the above technical solution, when the pole is installed to the first shell wall, the first pole part will apply a force to the first insulating seal, so that the first insulating seal squeezes the first shell wall, and the first shell wall will apply a reaction force to the first insulating seal, so that the first insulating seal is squeezed by the first pole part and the first shell wall, causing the first insulating seal to easily crack. By arranging a gasket between the first pole part and the first shell wall to buffer the force applied by the first pole part to the first insulating seal and / or the reaction force applied by the first shell wall to the first insulating seal, the risk of cracking of the first insulating seal is reduced, which is beneficial to improving the reliability of the insulating seal fit between the first shell wall and the first pole part, and improving the reliability of the battery cell.

[0009] In some embodiments, the gasket is provided between the first shell wall and the first insulating seal, and / or between the first pole portion and the first insulating seal.

[0010] In the above technical solution, the assembly of the gasket is facilitated, the production difficulty is reduced, and the structure and processing of the first insulating seal can be simplified. For example, the first insulating seal can be manufactured as an integral part, thereby facilitating the processing and assembly of the first insulating seal.

[0011] In some embodiments, the gasket includes a first gasket disposed between the first extension and the first insulating seal.

[0012] In the above technical solution, when the pole is installed on the first shell wall, when the first extension portion squeezes the first insulating seal toward the first shell wall, since a first gasket is provided between the first insulating seal and the first extension portion, the first gasket can reduce a part of the force, thereby reducing the force transmitted to the first insulating seal, thereby reducing the damage to the first insulating seal, and protecting the first insulating seal.

[0013] In some embodiments, the material hardness of the first gasket is greater than the material hardness of the first insulating seal.

[0014] In the above technical solution, the first gasket can better attenuate the extrusion force transmitted to the first insulating seal, and more effectively improve the cracking problem of the first insulating seal.

[0015] In some embodiments, the first gasket protrudes from or is flush with a side surface of the first insulating seal member close to the penetration portion in a direction close to the penetration portion.

[0016] In the above technical solution, when the pole is installed on the first shell wall, when the penetration portion squeezes the first insulating seal toward the first shell wall, since the first gasket protrudes from or is flush with the side surface of the first insulating seal close to the center axis of the mounting hole, the first gasket can reduce part of the force, thereby reducing the force transmitted to the first insulating seal, thereby reducing damage to the first insulating seal, and protecting the first insulating seal.

[0017] In some embodiments, the gasket includes a second gasket, which is disposed between the first insulating seal and a side surface of the first shell wall facing the first extension portion, and the material hardness of the second gasket is less than the material hardness of the first insulating seal.

[0018] In the above technical solution, when the pole is installed on the first shell wall, when the pole squeezes the first insulating seal toward the first shell wall, the first insulating seal can transmit the force to the second gasket. Since the material hardness of the second gasket is relatively small, it can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the first insulating seal, reducing the damage to the first insulating seal, and protecting the first insulating seal.

[0019] In some embodiments, the gasket includes a third gasket, which is disposed between the penetration portion and the first insulating seal.

[0020] In the above technical solution, when the pole is installed on the first shell wall, when the penetration portion squeezes the first insulating seal toward the first shell wall, since a third gasket is provided between the first insulating seal and the penetration portion, the third gasket can reduce part of the force, thereby reducing the force transmitted to the first insulating seal, thereby reducing damage to the first insulating seal and protecting the first insulating seal.

[0021] In some embodiments, the gasket further includes a third gasket, which is disposed between the penetration portion and the first insulating seal, and the first gasket and the third gasket are an integral part.

[0022] In the above technical solution, it is helpful to reduce the difficulty of installing and fixing the third gasket, and the first gasket and the third gasket can be installed together, which is helpful to improve the overall assembly efficiency.

[0023] In some embodiments, the gasket is formed into an annular structure extending along the entire circumference of the mounting hole.

[0024] In the above technical solution, the processing and assembly of the cushion are facilitated.

[0025] In some embodiments, a fitting gap is provided between the penetration portion and the first insulating seal.

[0026] In the above technical solution, when the pole is installed on the first shell wall, when the penetration portion squeezes the first insulating seal toward the first shell wall, due to the matching gap between the first insulating seal and the penetration portion, the penetration portion is not easy to directly pressurize the first insulating seal, thereby reducing the force transmitted to the first insulating seal, reducing the damage to the first insulating seal, and protecting the first insulating seal.

[0027] In some embodiments, the connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, the first shell wall includes a second corner set corresponding to the first corner, and the first insulating seal includes a fourth corner set corresponding to the second corner, wherein the first insulating seal includes a second sub-portion and a second part, the material hardness of the second sub-portion is less than the material hardness of the second part, and the second sub-portion defines the fourth corner.

[0028] In the above technical solution, by setting the second sub-part with a material hardness softer than the second part, the second sub-part is easily compressed and deformed when subjected to force, and absorbs the force, thereby reducing the risk of the first insulating seal cracking from the fourth corner.

[0029] In some embodiments, the connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, the first shell wall includes a second corner set corresponding to the first corner, and the first insulating seal includes a fourth corner set corresponding to the second corner, wherein at least one of the second corner and the fourth corner is formed as a chamfer.

[0030] In the above technical solution, when the pole is assembled and fixed to the first shell wall, the second corner easily squeezes the fourth corner, causing the first insulating seal to crack at the fourth corner. If the second corner is set as a chamfer, the area where the second corner applies force to the fourth corner can be increased, so that the force is dispersed, thereby reducing the concentrated force squeezing the fourth corner and reducing the risk of the first insulating seal cracking at the fourth corner. If the fourth corner is set as a chamfer, when the second corner applies force to the fourth corner, the force area of ​​the fourth corner can be increased, so that the force is dispersed at the fourth corner, thereby reducing the risk of the first insulating seal cracking at the fourth corner. Therefore, by forming at least one of the second corner and the fourth corner as a chamfer, the risk of the first insulating seal cracking at the fourth corner can be reduced.

[0031] In some embodiments, the connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, and the first insulating seal includes a third corner set corresponding to the first corner, wherein the first insulating seal includes a first sub-portion and a second portion, the material hardness of the first sub-portion is less than the material hardness of the second portion, and the first sub-portion defines the third corner.

[0032] In the above technical solution, by setting the first sub-part with a material hardness softer than the second part, the first sub-part is easily compressed and deformed when subjected to force, and absorbs the force, thereby reducing the risk of the first insulating seal cracking from the third corner.

[0033] In some embodiments, the connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, and the first insulating seal includes a third corner set corresponding to the first corner, wherein at least one of the first corner and the third corner is formed as a chamfer.

[0034] In the above technical solution, when the pole is assembled and fixed to the first housing wall, the first corner easily squeezes the third corner, causing the first insulating seal to crack at the third corner. If the first corner is configured as a chamfer, the area where the first corner applies force to the third corner can be increased, dispersing the force application location, thereby reducing the concentrated force squeezing the third corner location and reducing the risk of the first insulating seal cracking at the third corner. If the third corner is configured as a chamfer, the force application area of ​​the third corner can be increased when the first corner applies force to the third corner, dispersing the force at the third corner location, thereby reducing the risk of the first insulating seal cracking at the third corner. Therefore, by forming at least one of the first and third corners as a chamfer, the risk of the first insulating seal cracking at the third corner can be reduced.

[0035] In some embodiments, the first extension portion of the pole is formed by riveting.

[0036] In the above technical solution, the pole is easy to process, and is conducive to improving the connection reliability between the first extension portion and the penetration portion, and improving the assembly reliability between the pole and the first shell wall.

[0037] In some embodiments, the pole also includes a second extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the second extension portion and the first extension portion extend to the inner and outer sides of the first shell wall respectively, the penetration portion and the second extension portion constitute a second pole portion, and the battery cell also includes a second insulating seal that is fitted between the second pole portion and the first shell wall and is separately arranged from the first insulating seal.

[0038] In the above technical solution, since the pole includes the first extension portion and the second extension portion disposed on the inner and outer sides of the first shell wall, the cooperation between the pole and the first shell wall can be more stable and secure. Moreover, since the insulating sealing structure includes the first insulating seal and the second insulating seal disposed separately, the first insulating seal and the second insulating seal can be installed separately, thereby reducing the difficulty of assembly and ensuring the insulating sealing cooperation effect between the pole and the first shell wall at all locations.

[0039] In some embodiments, the pole includes a pole body and a pole cover, the pole body includes a first pole portion and a second pole portion, the first extension portion extends to the outside of the outer surface of the first shell wall, the pole cover is arranged on the side of the first pole portion away from the second pole portion, and the pole body is welded to the pole cover, and the material hardness of the second insulating seal is less than the material hardness of the first insulating seal.

[0040] In the above technical solution, the material hardness of the first insulating seal is greater than that of the second insulating seal. The second insulating seal is more easily compressed and deformed than the first insulating seal and has a better sealing effect. However, the heat resistance of the first insulating seal is stronger than that of the second insulating seal. For example, the first insulating seal is a plastic part and the second insulating seal is a rubber part. Therefore, when the pole body and the pole cover are welded, the thermal impact on the second insulating seal can be minimized, thereby improving the sealing reliability between the first shell wall and the pole.

[0041] In some embodiments, the first extension portion protrudes from the penetration portion toward the outside of the first shell wall to define a recessed groove between the first extension portion and the penetration portion. The edge of the pole cover plate is arranged in the recessed groove and is penetrated and welded to the penetration portion. The welding structure formed by the welding is separated from the first extension portion.

[0042] In the above technical solution, the shrinkage stress generated by the solidification of the molten pool formed by the welding can be blocked by the above-mentioned gap, making it difficult or less likely to be transmitted to the first extension portion. This can improve the warping problem of the first extension portion, allowing the first extension portion to press against the first insulating seal and the second insulating seal, thereby improving the insulation sealing effect. Moreover, because the edge of the pole cover plate is disposed within the recessed groove and is through-welded to the penetration portion, rather than butt-welded to the first extension portion, there is no need to ensure a small assembly gap between the edge of the pole cover plate and the first extension portion to meet butt welding requirements. The gap between the edge of the pole cover plate and the first extension portion can be larger, thereby improving the compatibility of the pole body and facilitating the reduction of the processing accuracy of the pole cover plate and the pole body.

[0043] In some embodiments, the battery cell forms a accommodating cavity on the inner side of the first shell wall, the pole includes a pole body, a accommodating groove open in a direction away from the accommodating cavity is formed on the pole body, and a connecting hole is provided on the pole body, which passes through the groove wall on one side of the accommodating groove close to the accommodating cavity and connects the accommodating cavity with the accommodating groove.

[0044] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving tank and then flow toward the receiving cavity through the connecting hole. The receiving tank can serve as a buffer for the electrolyte to improve the problem of electrolyte splashing and overflow. In addition, the side walls of the receiving tank can block electrolyte splashing to a certain extent, reducing external contamination caused by the electrolyte and facilitating rapid injection. Moreover, since there is no need to open a separate injection channel on the shell, there is no need for special processing of the shell, which helps to reduce the structural complexity and processing difficulty of the shell.

[0045] In some embodiments, the battery cell includes a cell assembly, which includes an active material coating portion received in a receiving cavity, and a conductive portion connected to the active material coating portion, wherein the conductive portion is passed through a connecting hole to be at least partially received in the receiving groove.

[0046] In the above technical solution, by accommodating at least part of the conductive part in the receiving groove, at least part of the conductive part occupies the space in the receiving groove, thereby reducing the space occupied by the conductive part in the receiving cavity, saving space in the receiving cavity to accommodate a larger volume of active material coating part, which is beneficial to improving the energy density of the battery cell, or when the energy density of the battery cell remains unchanged, it is beneficial to reduce the size of the battery cell.

[0047] In some embodiments, the pole includes a pole cover plate covering the pole body, a liquid injection hole that can be communicated with the receiving groove is formed on the pole cover plate, and the battery cell also includes a sealing structure for sealing the liquid injection hole.

[0048] In the above technical solution, by processing the injection hole on the pole cover, the opening is relatively small and located outside, so that the injection inlet can be reliably sealed more easily through the sealing structure, thereby improving the working reliability of the battery cell and realizing flexible and diversified design of the sealing structure.

[0049] In a second aspect, an embodiment of the present application further provides a battery comprising a battery cell according to any of the above solutions.

[0050] In the above technical solution, since the reliability of the battery cell according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery.

[0051] In a third aspect, an embodiment of the present application further provides an electrical device comprising a battery according to any of the above solutions.

[0052] In the above technical solution, since the performance of the battery is improved, it is beneficial to improve the working power performance of the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0054] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0055] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0056] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0057] FIG4 is a schematic orthographic projection diagram of a battery cell provided in some embodiments of the present application;

[0058] FIG5 is a cross-sectional view along line AA in FIG4 ;

[0059] FIG6 is a partial enlarged view of the circled portion B in FIG5 ;

[0060] FIG7 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0061] FIG8 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0062] FIG9 is an exploded schematic diagram of an insulating sealing structure and a gasket provided in some embodiments of the present application;

[0063] FIG10 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0064] FIG11 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0065] FIG12 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0066] FIG13 is a schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0067] 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; current collector 103; housing 1; accommodating cavity 11; mounting hole 12; central axis L; first housing wall 13; second corner 131; second housing wall 14; Pole 2; pole body 3; sink 31; first extension 32; penetration portion 33; first corner 34; first pole portion 35; accommodating groove 36; communicating hole 37; second extension 38; second pole portion 39; pole cover 4; injection hole 43; sealing structure 6; first sealing member 61; second sealing member 62; battery cell assembly 7; active material coating portion 71; conductive portion 72; insulating sealing structure 8; third corner 81; fourth corner 82; first sub-portion 831; second sub-portion 832; second portion 84; first insulating seal 85; second insulating seal 86; third insulating seal 87; gasket 9; first gasket 91; third gasket 93; second gasket 92. DETAILED DESCRIPTION

[0068] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0069] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0070] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0071] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0072] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0073] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0074] The term "plurality" used in this application refers to two or more (including two).

[0075] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0076] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a casing for enclosing one or more battery cells or one or more battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0077] A battery cell consists of a housing, a cell assembly, and an electrolyte. The housing holds the cell assembly and electrolyte. The cell assembly includes at least one electrode assembly, which consists of a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly can be a wound or stacked structure. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0078] A positive electrode sheet generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The uncoated positive current collector protrudes from the coated positive current collector, serving as the positive tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

[0079] A negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon, silicon, or other materials.

[0080] To ensure that high currents can pass without melting, the positive electrode tabs are multiple and stacked together to form the positive electrode tab portion, and the negative electrode tabs are multiple and stacked together to form the negative electrode tab portion. The housing is provided with a pole post, and the positive electrode tab portion is electrically connected to the positive electrode post, and the negative electrode tab portion is electrically connected to the negative electrode post. For example, the tab portion can be connected to the pole post to form a direct electrical connection between the tab portion and the pole post. For another example, the battery cell assembly can include an adapter plate, the tab portion is connected to the adapter plate, and the adapter plate is connected to the pole post to form an indirect electrical connection between the tab portion and the pole post.

[0081] The material of the isolation film is not limited, and can be, for example, polypropylene or polyethylene.

[0082] In some battery cells in the related art, the poles are installed on the shell by riveting. In order to achieve insulation sealing between the shell and the poles, insulating plastic is usually provided between the poles and the shell before riveting the poles. However, when the poles are riveted, the poles will be deformed by force and squeeze the insulating plastic. The weak parts of the insulating plastic are easily cracked by force. Once the insulating plastic cracks, it will affect the reliability of the insulation seal between the shell and the poles, resulting in a decrease in the reliability of the battery cell.

[0083] To this end, an embodiment of the present application proposes a battery cell, comprising: a shell, a pole and an insulating sealing structure, the shell comprising a first shell wall having a mounting hole, the pole comprising a penetration portion passing through the mounting hole, and a first extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the first extension portion extending to the outside of the outer surface of the first shell wall or the inside of the inner surface, the penetration portion and the first extension portion forming a first pole portion, the insulating sealing structure comprising a first insulating seal fitted between the first pole portion and the first shell wall, a gasket being provided between the first pole portion and the first shell wall, the gasket being used to buffer the force applied to the first insulating seal by at least one of the first pole portion and the first shell wall.

[0084] Therefore, when the pole is installed on the first shell wall, the first pole part will apply an action force to the first insulating seal, and the first shell wall will apply a reaction force to the first insulating seal, so that the first insulating seal is squeezed by the first pole part and the first shell wall, resulting in the weak position of the first insulating seal being easily cracked. By arranging a gasket between the first pole part and the first shell wall to buffer the action force applied by the first pole part to the first insulating seal and / or the reaction force applied by the first shell wall to the first insulating seal, the risk of the first insulating seal cracking at the weak position is reduced, which is beneficial to improving the reliability of the insulating seal fit between the first shell wall and the first pole part, and improving the reliability of the battery cell.

[0085] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0086] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0087] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0088] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0089] Please refer to Figure 2, which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the box body 101. The box body 101 is used to provide an assembly space for the battery cells 102, and the box body 101 can adopt a variety of structures. In some embodiments, the box body 101 may include a first box body 1011 and a second box body 1012, and the first box body 1011 and the second box body 1012 cover each other, and the first box body 1011 and the second box body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 can be a hollow structure with one end open, and the first box body 1011 can be a plate-like structure. The first box body 1011 covers the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define an assembly space. The first box body 1011 and the second box body 1012 can also be hollow structures with one side open, and the open side of the first box body 1011 covers the open side of the second box body 1012. Of course, the box body 101 formed by the first box body 1011 and the second box body 1012 can be of various shapes, such as a cylinder, a cuboid, etc.

[0090] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the multiple battery cells 102. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 102 is housed within the housing 101. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 102 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 101. The battery 100 may also include other structures, such as a busbar assembly for electrically welding the multiple battery cells 102 together.

[0091] Each battery cell 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 can be cylindrical, flat, or rectangular. For example, referring to the embodiment shown in FIG3 , the length of the battery cell 102 is a first direction X, the width of the battery cell 102 is a second direction Y, and the height of the battery cell 102 is a third direction Z. The first direction X, the second direction Y, and the third direction Z are mutually perpendicular.

[0092] In some embodiments of the present application, with reference to Figures 3-6 , a battery cell 102 includes a housing 1 and a terminal 2. The terminal 2 is disposed in the housing 1, and a receiving cavity 11 is formed within the housing 1. For example, the battery cell 102 includes a cell assembly 7. The cell assembly 7 may include an active material coating portion 71 and a conductive portion 72 connected to the active material coating portion 71. The active material coating portion 71 is received in the receiving cavity 11, and the conductive portion 72 is welded to the terminal 2, such that the conductive portion 72 is electrically connected between the active material coating portion 71 and the terminal 2.

[0093] 5 and 6 , the housing 1 includes a first housing wall 13 having a mounting hole 12 therein. The pole 2 is passed through the mounting hole 12 to be mounted on the first housing wall 13. The pole 2 includes a penetration portion 33 and a first extension portion 32. The penetration portion 33 penetrates the mounting hole 12, i.e., at least a portion of the penetration portion 33 is located within the mounting hole 12. The projection of the penetration portion 33 on the projection surface falls within the projection range of the mounting hole 12 on the projection surface, with the axial direction of the mounting hole 12 as the projection direction and a plane perpendicular to the axial direction of the mounting hole 12 as the projection plane. This allows the penetration portion 33 to penetrate the mounting hole 12.

[0094] 5 and 6 , the first extension portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The first extension portion 32 extends to the outside of the outer surface or the inside of the inner surface of the first shell wall 13. The two side surfaces of the first shell wall 13 in the wall thickness direction are the outer surface and the inner surface, respectively. The inner surface is the side of the first shell wall 13 facing the accommodating cavity 11, and the outer surface is the side of the first shell wall 13 facing away from the accommodating cavity 11. The side of the outer surface facing away from the accommodating cavity 11 is the outer side of the outer surface, and the side of the inner surface facing the accommodating cavity 11 is the inner side of the inner surface. “The first extension portion 32 extends to the outside of the outer surface or the inside of the inner surface of the first shell wall 13” means: at least part of the first extension portion 32 is opposite to the first shell 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 first extension portion 32 on the projection surface and the projection of the first shell wall 13 on the projection surface have an intersection area, and the part of the first extension portion 32 corresponding to the intersection area is opposite to the first shell wall 13.

[0095] 5 and 6 , the penetration portion 33 and the first extension portion 32 constitute a first pole portion 35 , and the battery cell 102 includes a first insulating seal 85 fitted between the first pole portion 35 and the first shell wall 13 , that is, at least a portion of the first insulating seal 85 is sandwiched between the first pole portion 35 and the first shell wall 13 , so that the first pole portion 35 and the first shell wall 13 are indirectly fitted through the first insulating seal 85 , thereby achieving insulation and sealing between the first pole portion 35 and the first shell wall 13 .

[0096] 5 and 6 , the battery cell 102 further includes a gasket 9 , which is disposed between the first pole portion 35 and the first shell wall 13 and is used to buffer a force applied to the first insulating seal 85 by at least one of the first pole portion 35 and the first shell wall 13 . In this way, when the pole 2 is installed to the first shell wall 13, the first pole portion 35 will apply an action force to the first insulating seal 85, and the first shell wall 13 will apply a reaction force to the first insulating seal 85 (that is, the action force applied by the first shell wall 13 to the first insulating seal 85 can be a reaction force), so that the first insulating seal 85 is squeezed by the first pole portion 35 and the first shell wall 13, resulting in the weak position of the first insulating seal 85 being prone to cracking. By arranging a gasket 9 between the first pole portion 35 and the first shell wall 13 to buffer the action force applied by the first pole portion 35 to the first insulating seal 85 and / or the reaction force applied by the first shell wall 13 to the first insulating seal 85, the risk of the first insulating seal 85 cracking at the weak position is reduced, which is beneficial to improving the reliability of the insulating and sealing fit between the first shell wall 13 and the first pole portion 35, and improving the reliability of the battery cell 102.

[0097] In short, by providing the gasket 9, the force applied by the first pole portion 35 to the first insulating seal 85 can be reduced, and / or the reaction force applied by the first shell wall 13 to the first insulating seal 85 can be reduced, thereby reducing the damage caused to the first insulating seal 85, thereby protecting the first insulating seal 85 and improving the cracking problem of the first insulating seal 85.

[0098] It is worth noting that the location and buffering method of the gasket 9 are not limited, as long as the damage to the first insulating seal 85 can be reduced during the assembly of the pole 2 to the first shell wall 13. For example, in some embodiments, as shown in Figures 6 and 7, the gasket 9 can be arranged between the first shell wall 13 and the first insulating seal 85, and / or between the first pole portion 35 and the first insulating seal 85. In other words, the gasket 9 can be arranged at least one of the locations between the first shell wall 13 and the first insulating seal 85 and between the first pole portion 35 and the first insulating seal 85. This facilitates the assembly of the gasket 9 and reduces the difficulty of production. Moreover, the structure and processing of the first insulating seal 85 can be simplified. For example, the first insulating seal 85 can be manufactured as an integral part, thereby facilitating the processing and assembly of the first insulating seal 85.

[0099] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the gasket 9 may be disposed in other positions. For example, the first insulating seal 85 may be disposed in a component form. In this case, the gasket 9 may be disposed between multiple components of the first insulating seal 85, and the material hardness of the gasket 9 may be set to be less than the material hardness of the first insulating seal 85. When the force generated by the assembly of the pole 2 and the first shell wall 13 is applied to the first insulating seal 85, the multiple components of the first insulating seal 85 may move relative to each other, so that the gasket 9 may be compressed and deformed to absorb the force, thereby reducing damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0100] 6 and 7 , the gasket 9 may include a first gasket 91 disposed between the first extension portion 32 and the first insulating seal 85. Thus, when the pole 2 is mounted on the first housing wall 13, when the first extension portion 32 presses the first insulating seal 85 toward the first housing wall 13 (e.g., presses the first insulating seal 85 along the axial direction of the mounting hole 12), the first gasket 91 disposed between the first insulating seal 85 and the first extension portion 32 can reduce a portion of the applied force, thereby reducing the applied force transmitted to the first insulating seal 85, thereby reducing damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0101] It is worth noting that the material hardness of the first gasket 91 and the first insulating seal 85 are not limited. For example, the material hardness of the first gasket 91 can be greater than the material hardness of the first insulating seal 85. As a result, the first gasket 91 can effectively attenuate the extrusion force transmitted to the first insulating seal 85, more effectively improving the cracking problem of the first insulating seal 85. For example, the first insulating seal 85 can be a plastic component and the first gasket 91 can be a metal component, so that the material hardness of the first gasket 91 can be greater than the material hardness of the first insulating seal 85. For example, the first gasket 91 can be made of steel, such as SUS304, SUS316, SPCC, etc., or aluminum, such as Al 1060, etc.

[0102] For example, as shown in Figure 6, the thickness D of the first gasket 91 in the axial direction of the mounting hole 12 can be 0.05mm~2mm, so that the thickness of the first gasket 91 is not too thin and the strength can be better, so as to play a more effective supporting role, thereby better protecting the first insulating seal 85, and the thickness of the first gasket 91 is not too thick, which can reduce its space occupancy.

[0103] For example, as shown in FIG6 , with the axial direction of the mounting hole 12 as the projection direction and the plane perpendicular to the axial direction of the mounting hole 12 as the projection plane, the width dimension of the overlapping area of ​​the projection of the first gasket 91 on the projection plane and the projection of the first extension portion 32 on the projection plane along the radial direction of the mounting hole 12 is W1 (i.e., W1 is the projection width of the overlap between the first extension portion 32 and the first gasket 91), and the width dimension of the projection of the first extension portion 32 on the projection plane along the radial direction of the mounting hole 12 is B (i.e., B is the width of the riveted flange of the pole 2). Where W1 ≥ 0.5 mm and / or 0.05B ​​≤ W1 ≤ 0.95B, thereby providing a relatively sufficient overlap width between the first extension portion 32 and the first gasket 91, allowing the first gasket 91 to provide a relatively effective support and better protect the first insulating seal 85.

[0104] For example, as shown in Figure 6, the width dimension of the overlapping area of ​​the projection of the side surface of the first insulating seal 85 facing the first extension portion 32 on the projection plane and the projection of the first extension portion 32 on the projection plane along the radial direction of the mounting hole 12 is W2 (that is, W2 is the projection width of the overlap between the first extension portion 32 and the first insulating seal 85), 0.05B≤W2≤0.95B, so that the first extension portion 32 and the first insulating seal 85 have a relatively sufficient overlap width, and the first extension portion 32 can play a role in more effectively pressing the first insulating seal 85, so that the first insulating seal 85 can play a more effective insulating sealing effect.

[0105] For example, as shown in FIG6 , the first gasket 91 protrudes from or is flush with a side surface of the first insulating seal 85 near the penetration portion 33 in a direction close to the penetration portion 33. Thus, when the pole 2 is mounted on the first housing wall 13, when the penetration portion 33 presses the first insulating seal 85 in a direction close to the first housing wall 13 (for example, presses the first insulating seal 85 along the radial direction of the mounting hole 12), because the first gasket 91 protrudes from or is flush with a side surface of the first insulating seal 85 near the central axis L of the mounting hole 12 in a direction close to the central axis L of the mounting hole 12, the first gasket 91 can reduce a portion of the acting force, thereby reducing the acting force transmitted to the first insulating seal 85, thereby reducing damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0106] In some embodiments, the gap T between the first gasket 91 and the penetration portion 33 can be greater than or equal to 0.05 mm, thereby facilitating the assembly of the first gasket 91 with the pole 2 and meeting the assembly gap requirement. Furthermore, when the first gasket 91 protrudes from or is flush with the side surface of the first insulating seal 85 near the penetration portion 33 in the direction close to the penetration portion 33, the gap T between the first gasket 91 and the penetration portion 33 can be greater than or equal to 0.05 mm, thereby facilitating the assembly of the first gasket 91 with the pole 2 and meeting the assembly gap requirement.

[0107] In some embodiments, the battery cell 102 includes an insulating sealing structure 8 that fits between the first housing wall 13 and the terminal 2. Specifically, at least a portion of the insulating sealing structure 8 is sandwiched between the first housing wall 13 and the terminal 2, so that the terminal 2 and the first housing wall 13 are indirectly engaged through the insulating sealing structure 8, thereby achieving insulation and sealing between the first housing wall 13 and the terminal 2. The terminal 2 also includes a second extension portion 38 connected to the penetration portion 33 and extending relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The second extension portion 38 and the first extension portion 32 extend to the inner and outer sides of the first housing wall 13, respectively. The penetration portion 33 and the second extension portion 38 form a second terminal portion 39. The insulating sealing structure 8 includes a first insulating seal 85 that fits between the first terminal portion 35 and the first housing wall 13, and a second insulating seal 86 that fits between the second terminal portion 39 and the first housing wall 13. It is understood that the first and second terminal portions 35 and 39 share the penetration portion 33.

[0108] The second insulating seal 86 and the first insulating seal 85 are positioned approximately on the inner and outer sides of the first housing wall 13. The material hardness of the second insulating seal 86 is lower than that of the first insulating seal 85, thereby providing better sealing performance with easy compression and deformation. For example, the second insulating seal 86 may be a rubber member. Therefore, when the material hardness of the first gasket 91 is higher than that of the first insulating seal 85, the first gasket 91 can also provide more effective support, allowing the compression of the second insulating seal 86 to be better controlled, thereby achieving a more effective sealing effect and improving the sealing performance between the pole 2 and the first housing wall 13.

[0109] In some embodiments, referring to Figure 8, the gasket 9 may include a second gasket 92, which is arranged between the first insulating seal 85 and the side surface of the first shell wall 13 facing the first extension portion 32. For example, when the first extension portion 32 extends to the outside of the outer surface of the first shell wall 13, the second gasket 92 is arranged between the first extension portion 32 and the outer surface of the first shell wall 13. For another example, when the first extension portion 32 extends to the inside of the inner surface of the first shell wall 13, the second gasket 92 is arranged between the first extension portion 32 and the inner surface of the first shell wall 13, and the material hardness of the second gasket 92 is less than the material hardness of the first insulating seal 85.

[0110] Therefore, when the pole 2 is installed on the first shell wall 13, when the pole 2 squeezes the first insulating seal 85 toward the first shell wall 13 (for example, the first insulating seal 85 is squeezed along the axial direction of the mounting hole 12), the first insulating seal 85 can transmit the force to the second gasket 92. Since the material hardness of the second gasket 92 is relatively small, it can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the first insulating seal 85, reducing damage to the first insulating seal 85, and protecting the first insulating seal 85.

[0111] 7 and 8 , the gasket 9 may include a third gasket 93 disposed between the penetration portion 33 and the first insulating seal 85. Thus, when the pole 2 is mounted on the first housing wall 13, when the penetration portion 33 presses the first insulating seal 85 toward the first housing wall 13 (e.g., presses the first insulating seal 85 along the radial direction of the mounting hole 12), the third gasket 93 disposed between the first insulating seal 85 and the penetration portion 33 can reduce a portion of the applied force, thereby reducing the applied force transmitted to the first insulating seal 85, thereby reducing damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0112] It is worth noting that the material hardness of the third gasket 93 and the material hardness of the first insulating seal 85 are not limited. For example, the material hardness of the third gasket 93 can be greater than the material hardness of the first insulating seal 85. As a result, the third gasket 93 can effectively attenuate the extrusion force transmitted to the first insulating seal 85. For another example, the material hardness of the third gasket 93 can be less than the material hardness of the first insulating seal 85. As a result, the third gasket 93 can absorb the extrusion force from the first pole portion 35 through deformation, thereby reducing the extrusion force transmitted to the first insulating seal 85.

[0113] In some embodiments, the gasket 9 may include at least two of the first gasket 91, the third gasket 93, and the second gasket 92, that is, the gasket 9 may include any two of the first gasket 91, the third gasket 93, and the second gasket 92, or may also include the first gasket 91, the third gasket 93, and the second gasket 92 at the same time, so as to protect the first insulating seal 85 from multiple angles and better reduce the damage caused by the first insulating seal 85.

[0114] In some embodiments, when the gasket 9 includes both the first gasket 91 and the third gasket 93, the first gasket 91 and the third gasket 93 can be made into an integral part, which is conducive to reducing the difficulty of installing and fixing the third gasket 93, and the first gasket 91 and the third gasket 93 can be installed together, which is conducive to improving the overall assembly efficiency.

[0115] In some embodiments, a fitting gap is provided between the first insulating seal 85 and the penetration portion 33. In this way, when the pole 2 is installed on the first shell wall 13, when the penetration portion 33 squeezes the first insulating seal 85 in the direction of the first shell wall 13 (for example, squeezing the first insulating seal 85 along the radial direction of the mounting hole 12), due to the fitting gap between the first insulating seal 85 and the penetration portion 33, the penetration portion 33 is not easily squeezed directly onto the first insulating seal 85, thereby reducing the force transmitted to the first insulating seal 85, reducing damage to the first insulating seal 85, and protecting the first insulating seal 85. Moreover, when a fitting gap is provided between the first insulating seal 85 and the penetration portion 33, the third gasket 93 can be omitted to reduce costs. Of course, the present application is not limited to this. For example, a third gasket 93 can also be provided as needed, and a fitting gap can be provided between the third gasket 93 and the penetration portion 33.

[0116] In some embodiments, in conjunction with Figure 9, the gasket 9 is formed into an annular structure extending along the entire circumference of the mounting hole 12. For example, at least one of the first gasket 91, the second gasket 92, and the third gasket 93 is formed into an annular structure extending along the entire circumference of the mounting hole 12. Thereby, the processing and assembly of the gasket 9 are facilitated. For example, the first gasket 91 can be formed into an annular structure extending along the entire circumference of the mounting hole 12, thereby facilitating the processing and assembly of the first gasket 91. For example, the second gasket 92 can be formed into an annular structure extending along the entire circumference of the mounting hole 12, thereby facilitating the processing and assembly of the second gasket 92. For example, the third gasket 93 can be formed into an annular structure extending along the entire circumference of the mounting hole 12, thereby facilitating the processing and assembly of the third gasket 93.

[0117] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the gasket 9, such as at least one of the first gasket 91, the second gasket 92 and the third gasket 93, can also be processed into a discontinuous structure arranged at circumferential intervals along the mounting hole 12, which is beneficial to saving materials.

[0118] In some embodiments of the present application, as shown in Figures 7 and 8 , the first extension portion 32 of the terminal 2 is formed by flanging and riveting. Specifically, after the terminal 2 is assembled into the mounting hole 12 via the through-hole 33, the first extension portion 32 is formed by flanging and riveting. This facilitates the processing of the terminal 2 and helps improve the connection reliability between the first extension portion 32 and the through-hole 33, thereby enhancing the assembly reliability of the terminal 2 and the first housing wall 13.

[0119] Specifically, when the pole 2 is riveted and flanged, due to the outward turning force, the first extension portion 32 is likely to apply an axial extrusion force along the mounting hole 12 to the first insulating seal 85, and the penetration portion 33 is likely to apply a radial extrusion force along the mounting hole 12 to the first insulating seal 85, causing the first insulating seal 85 to be easily cracked due to the axial and / or radial pressure along the mounting hole 12. By providing a gasket 9 to buffer the force applied to the first insulating seal 85, the cracking problem of the first insulating seal 85 can be improved.

[0120] For example, a first gasket 91 can be arranged between the first insulating seal 85 and the first extension portion 32. In this way, when the first extension portion 32 is formed by the flanging riveting process, the first gasket 91 can play a supporting role, thereby improving the problem that the first extension portion 32 directly squeezes the first insulating seal 85, causing the first insulating seal 85 to crack.

[0121] In some embodiments of the present application, as shown in Figure 10, the connection between the first extension portion 32 and the penetration portion 33 has a first corner 34 set toward the first shell wall 13, that is, the side of the connection between the first extension portion 32 and the penetration portion 33 close to the first shell wall 13 is formed as the first corner 34, and the first shell wall 13 includes a second corner 131 set corresponding to the first corner 34, that is, the corner of the first shell wall 13 close to the first corner 34 is the second corner 131, and the first insulating seal 85 includes a fourth corner 82 set corresponding to the second corner 131, wherein the first insulating seal 85 includes a second sub-portion 832 and a second part 84, the material hardness of the first sub-portion 831 is less than the material hardness of the second part 84, and the second sub-portion 832 defines the fourth corner 82.

[0122] Since the first insulating seal 85 includes a fourth corner 82 arranged corresponding to the second corner 131, when the pole 2 is assembled and fixed to the first shell wall 13, the pole 2 will squeeze the first insulating seal 85, and the first insulating seal 85 will squeeze the first shell wall 13. The first shell wall 13 will apply a reaction force to the first insulating seal 85, and the reaction force applied to the first insulating seal 85 by the second corner 131 of the first shell wall 13 at the fourth corner 82 is relatively large, and it is easy to crack. By providing a second sub-portion 832 with a material hardness that is softer than the second part 84, the second sub-portion 832 is easily compressed and deformed under force, absorbing the force, thereby reducing the risk of the first insulating seal 85 cracking at the fourth corner 82.

[0123] In some embodiments of the present application, as shown in Figure 11, the connection between the first extension portion 32 and the penetration portion 33 has a first corner 34 set toward the first shell wall 13, the first shell wall 13 includes a second corner 131 set corresponding to the first corner 34, and the first insulating seal 85 includes a third corner 81 set corresponding to the first corner 34, wherein the first insulating seal 85 includes a first sub-portion 831 and a second portion 84, the material hardness of the first sub-portion 831 is less than the material hardness of the second portion 84, and the first sub-portion 831 defines the third corner 81.

[0124] Since the first insulating seal 85 includes a third corner 81 arranged corresponding to the first corner 34, when the pole 2 is assembled and fixed to the first shell wall 13, the pole 2 will squeeze the first insulating seal 85. The first insulating seal 85 is subjected to relatively large force at the third corner 81 and is prone to cracking. By providing a first sub-portion 831 with a material hardness that is softer than that of the second portion 84, the first sub-portion 831 is easily compressed and deformed when subjected to force, absorbing the force, thereby reducing the risk of the first insulating seal 85 cracking at the third corner 81.

[0125] It is worth noting that the materials of the first portion 83 and the second portion 84 are not limited and can be selected based on actual requirements. For example, the material of the first portion 83 can be a compressible rubber or plastic material, such as PFA (perfluoroalkyl), PP (polypropylene), FKM (fluororubber), or EPDM (ethylene propylene diene monomer), etc., so that the first portion 83 has good compression deformation performance, thereby more effectively improving the cracking problem. For example, the material of the second portion 84 can be an insulating material with higher hardness, such as PPS (polyphenylene sulfide, a new high-performance thermoplastic resin) or LCP (liquid crystal polymer), etc., so that the second portion 84 has good hardness and provides support, so that the compression of the first insulating seal 85 can be better controlled, thereby improving the sealing performance.

[0126] It is worth noting that the first portion 83 may also include a first sub-portion 831 and a second sub-portion 832, thereby more comprehensively reducing the risk of cracking of the first insulating seal 85 at weak locations and improving the structural reliability of the first insulating seal 85. Furthermore, it is worth noting that the materials of the first sub-portion 831 and the second sub-portion 832 may be the same or different, and may be specifically set according to actual circumstances.

[0127] In some embodiments of the present application, as shown in FIG10 , the connection between the first extension portion 32 and the penetration portion 33 has a first corner 34 disposed toward the first shell wall 13, the first shell wall 13 includes a second corner 131 disposed corresponding to the first corner 34, and the first insulating seal 85 includes a fourth corner 82 disposed corresponding to the second corner 131, wherein at least one of the second corner 131 and the fourth corner 82 is formed as a chamfer (such as a rounded corner or a chamfered corner). In other words, only the second corner 131 can be formed as a chamfer, and the fourth corner 82 can be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or only the fourth corner 82 can be formed as a chamfer, and the second corner 131 can be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or still further, both the second corner 131 and the fourth corner 82 can be formed as chamfers.

[0128] When the pole 2 is assembled and fixed to the first housing wall 13, the second corner 131 easily presses against the fourth corner 82, causing the first insulating seal 85 to crack at the fourth corner 82. If the second corner 131 is configured as a chamfer, the area where the second corner 131 applies force to the fourth corner 82 can be increased, dispersing the force application location, thereby reducing the concentrated force pressing the fourth corner 82 location and reducing the risk of the first insulating seal 85 cracking at the fourth corner 82. If the fourth corner 82 is configured as a chamfer, the force application area of ​​the fourth corner 82 can be increased when the second corner 131 applies force to the fourth corner 82, dispersing the force at the fourth corner 82 location and reducing the risk of the first insulating seal 85 cracking at the fourth corner 82. Therefore, by forming at least one of the second corner 131 and the fourth corner 82 as a chamfer, the risk of the first insulating seal 85 cracking at the fourth corner 82 can be reduced.

[0129] In some embodiments of the present application, regardless of whether at least one of the second corner 131 and the fourth corner 82 is processed into a chamfered form, the second corner 131 and the fourth corner 82 can be set to have a fitting gap. In this way, the extrusion of the second corner 131 on the fourth corner 82 can be reduced to a certain extent, thereby reducing the risk of the first insulating seal 85 cracking from the position of the fourth corner 82.

[0130] In some embodiments of the present application, as shown in FIG11 , the connection between the first extension portion 32 and the penetration portion 33 has a first corner 34 disposed toward the first shell wall 13, the first shell wall 13 includes a second corner 131 disposed corresponding to the first corner 34, and the first insulating seal 85 includes a third corner 81 disposed corresponding to the first corner 34, wherein at least one of the first corner 34 and the third corner 81 is formed as a chamfer (e.g., a rounded corner or a chamfered angle). In other words, only the first corner 34 can be formed as a chamfer, and the third corner 81 can be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or only the third corner 81 can be formed as a chamfer, and the first corner 34 can be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or still further, both the first corner 34 and the third corner 81 can be formed as chamfers.

[0131] When the pole 2 is assembled and fixed to the first housing wall 13, the first corner 34 easily presses against the third corner 81, causing the first insulating seal 85 to crack at the location of the third corner 81. If the first corner 34 is configured as a chamfer, the area where the first corner 34 applies force to the third corner 81 can be increased, dispersing the force application location, thereby reducing the concentrated force pressing the location of the third corner 81 and reducing the risk of the first insulating seal 85 cracking at the location of the third corner 81. If the third corner 81 is configured as a chamfer, the force application area of ​​the third corner 81 can be increased when the first corner 34 applies force to the third corner 81, dispersing the force at the location of the third corner 81, thereby reducing the risk of the first insulating seal 85 cracking at the location of the third corner 81. Therefore, by forming at least one of the first corner 34 and the third corner 81 as a chamfer, the risk of the first insulating seal 85 cracking at the location of the third corner 81 can be reduced.

[0132] In some embodiments of the present application, 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 set between the first corner 34 and the third corner 81. In this way, the extrusion of the first corner 34 on the third corner 81 can be reduced to a certain extent, thereby reducing the risk of the first insulating seal 85 cracking from the position of the third corner 81.

[0133] It is worth noting that regardless of whether the first sub-portion 831 is provided at the third corner 81, the third corner 81 can be processed into a chamfered form, and regardless of whether the second sub-portion 832 is provided at the fourth corner 82, the fourth corner 82 can be processed into a chamfered form.

[0134] It is worth noting that when the battery cell 102 includes a first gasket 91 disposed between the first extension portion 32 and the first insulating seal 85, as shown in FIG10 , if the radial dimension of the first gasket 91 is sufficient, the third corner 81 and the terminal 2 can be spaced apart to a certain extent, thereby protecting the third corner 81. Simultaneously, providing a chamfer or a second sub-portion 832 at the fourth corner 82 can also protect the fourth corner 82. Of course, when providing the first gasket 91, a chamfer or a first sub-portion 831 can also be provided at the third corner 81 to further improve the cracking problem of the third corner 81.

[0135] It is worth noting that when the battery cell 102 includes a second gasket 92 disposed between the first insulating seal 85 and the surface of the first shell wall 13 facing the first extension portion 32, as shown in FIG11 , if the radial dimension of the second gasket 92 is sufficient, it can space the fourth corner 82 from the first shell 1 to a certain extent, thereby protecting the fourth corner 82. At the same time, providing a chamfer or a first sub-portion 831 at the third corner 81 can also protect the third corner 81. Of course, when providing the second gasket 92, a chamfer or a second sub-portion 832 can also be provided at the fourth corner 82 to further improve the cracking problem of the fourth corner 82.

[0136] In some embodiments of the present application, as shown in Figure 8, the pole 2 also includes a second extension portion 38 connected to the penetration portion 33 and extending relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The second extension portion 38 and the first extension portion 32 extend to the inner and outer sides of the first shell wall 13 respectively. The penetration portion 33 and the second extension portion 38 constitute a second pole portion 39. The battery cell 102 also includes a second insulating seal 86 that is fitted between the second pole portion 39 and the first shell wall 13 and is separately arranged from the first insulating seal 85.

[0137] Thus, since the pole 2 includes the first extension portion 32 and the second extension portion 38 disposed on the inner and outer sides of the first shell wall 13, the cooperation between the pole 2 and the first shell wall 13 can be more stable and secure. Moreover, since the insulating sealing structure 8 includes the first insulating seal 85 and the second insulating seal 86 disposed separately, the first insulating seal 85 and the second insulating seal 86 can be installed separately, thereby reducing the difficulty of assembly and ensuring the insulating sealing cooperation effect of the pole 2 and the first shell wall 13 at all locations.

[0138] In addition, in some embodiments, referring to FIG8 , the battery cell 102 may further include a third insulating seal 87. The third insulating seal 87 may be disposed between the second extension 38 and the housing 1 and abut 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 improves the stability of the fit between the cell assembly 7 and the housing 1, thereby improving the reliability of the battery cell 102. Alternatively, the third insulating seal 87 may be eliminated, and an insulating bracket (not shown) may be provided at the end of the active material coating portion 71. The insulating bracket abuts the inner surface of the housing 1, thereby protecting the cell assembly 7 when it is installed in the housing 1, preventing the housing 1 from scratching the cell assembly 7, and improving the insulation between the cell assembly 7 and the housing 1. This also improves the stability of the fit between the cell assembly 7 and the housing 1, thereby improving the reliability of the battery cell 102.

[0139] In some embodiments of the present application, as shown in Figure 7, the pole 2 includes a pole body 3 and a pole cover 4, the pole body 3 includes a first pole portion 35 and a second pole portion 39, the first extension portion 32 extends to the outside of the outer surface of the first shell wall 13, the pole cover 4 is covered on the side of the first pole portion 35 away from the second pole portion 39, and the pole body 3 is welded to the pole cover 4, and the material hardness of the second insulating seal 86 is less than the material hardness of the first insulating seal 85.

[0140] Therefore, the material hardness of the first insulating seal 85 is greater than that of the second insulating seal 86, and the second insulating seal 86 is more easily compressed and deformed than the first insulating seal 85 and has a better sealing effect, but 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 and the second insulating seal 86 is a rubber part. Therefore, when the pole body 3 and the pole cover 4 are welded, the thermal impact on the second insulating seal 86 can be minimized, thereby improving the sealing reliability between the first shell wall 13 and the pole 2.

[0141] In some embodiments of the present application, as shown in Figure 7, the first extension portion 32 protrudes from the penetration portion 33 toward the outside of the first shell wall 13 to define a recessed groove 31 between the first extension portion 32 and the penetration portion 33. The edge of the pole cover plate 4 is arranged in the recessed groove 31 and is penetrated and welded to the penetration portion 33. The welded structure formed by the welding is separated from the first extension portion 32.

[0142] As a result, the shrinkage stress generated by the solidification of the molten pool formed by the welding can be blocked by the aforementioned gap, making it difficult or less likely to be transmitted to the first extension portion 32. This can improve the warping problem of the first extension portion 32, allowing the first extension portion 32 to compress the first insulating seal 85 and the second insulating seal 86, thereby improving the insulation sealing effect. Moreover, because the edge of the pole cover plate 4 is disposed within the recessed groove 31 and is penetrated and welded to the penetration portion 33, rather than being butt-welded to the first extension portion 32, there is no need to ensure a small assembly gap between the edge of the pole cover plate 4 and the first extension portion 32 to meet the butt welding requirements. This allows for a larger gap between the edge of the pole cover plate 4 and the first extension portion 32, thereby improving the compatibility of the pole body 3 and facilitating the reduction of the machining accuracy of the pole cover plate 4 and the pole body 3.

[0143] In some embodiments of the present application, as shown in FIG7 , a battery cell 102 has an accommodating cavity 11 formed on the inner side of the first shell wall 13. The electrode 2 includes a electrode body 3, which is formed with an accommodating groove 36 that opens in a direction away from the accommodating cavity 11. The electrode body 3 has a connecting hole 37 that passes through the groove wall of the accommodating groove 36 on one side near the accommodating cavity 11 and connects the accommodating cavity 11 with the accommodating groove 36. For example, when the penetration portion 33 is annular, the accommodating groove 36 is located in the inner ring region of the penetration portion 33. For example, the accommodating groove 36 can be jointly defined by the penetration portion 33 and a support portion located in the inner ring region of the penetration portion 33, and the connecting hole 37 passes through the support portion.

[0144] Thus, when the electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving groove 36 and then flow toward the receiving cavity 11 through the connecting hole 37, wherein the receiving groove 36 can play the role of buffering the electrolyte to improve the problems of electrolyte splashing, overflowing, etc. Moreover, the side wall of the receiving groove 36 (that is, the groove wall extending from the notch of the receiving groove 36 toward the receiving cavity 11) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell 1, there is no need to perform special processing on the shell 1, which is conducive to reducing the structural complexity and processing difficulty of the shell 1.

[0145] 12 , the side of the recess 31 facing the central axis L of the mounting hole 12 is open to communicate with the receiving groove 36. This improves the compactness of the coupling between the pole body 3 and the pole cover 4 and simplifies the structure and processing of the pole cover 4.

[0146] In some embodiments of the present application, as shown in Figure 7, the battery cell 102 includes a cell assembly 7, the cell assembly 7 includes an active material coating portion 71 received in the accommodating cavity 11, and a conductive portion 72 connected to the active material coating portion 71, the conductive portion 72 is passed through the connecting hole 37 to be at least partially received in the accommodating groove 36.

[0147] It is worth noting that there may be one or more communicating holes 37, and the conductive portion 72 may be provided through at least one of the communicating holes 37. For example, at least one communicating hole 37 is capable of passing electrolyte. For example, at least one communicating hole 37 is left vacant (i.e., not provided with the conductive portion 72), thereby enabling electrolyte to pass through without being obstructed by the conductive portion 72. For another example, at least one communicating hole 37 is still capable of passing electrolyte after being provided with the conductive portion 72.

[0148] Therefore, by accommodating at least a portion of the conductive part 72 in the receiving groove 36, at least a portion of the conductive part 72 occupies the space in the receiving groove 36, thereby reducing the space occupied by the conductive part 72 in the receiving cavity 11, saving space in the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, thereby facilitating the improvement of the energy density of the battery cell 102, or reducing the size of the battery cell 102 when the energy density of the battery cell 102 remains unchanged.

[0149] It is understandable that the active material coating portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only the pole ear portion, or may include the pole ear portion and an adapter electrically connected to the pole ear portion, etc., which is not limited here.

[0150] In some embodiments, the conductive portion 72 is welded to the pole body 3 to form an electrical connection, thereby enabling the battery cell assembly 7 to be output from the electrode at the pole body 3. For example, as shown in FIG7 , the conductive portion 72 is welded to the side wall of the accommodating groove 36 close to the accommodating cavity 11, thereby improving the compactness of the fit and facilitating the welding operation between the two. Of course, the present application is not limited to this. In other embodiments, the conductive portion 72 can also be configured to be welded to the pole cover plate 4 to form an electrical connection, which is not limited here.

[0151] In some embodiments of the present application, as shown in Figure 12, the pole 2 includes a pole cover 4 covering the pole body 3, and a liquid injection hole 43 that can be connected to the accommodating groove 36 is formed on the pole cover 4. The battery cell 102 also includes a sealing structure 6 for sealing the liquid injection hole 43.

[0152] Thus, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43 first, or the sealing structure 6 is in a state of opening the injection hole 43, and the electrolyte can be injected into the receiving tank 36 through the injection hole 43. After the injection, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a state of closing the injection hole 43, thereby sealing the injection hole 43 to prevent the electrolyte from overflowing and prevent foreign matter from entering the receiving cavity 11 through the injection hole 43, thereby improving the reliability of the battery cell 102.

[0153] Therefore, by processing the injection hole 43 on the pole cover 4, the opening is relatively small and located outside, and the injection inlet can be reliably sealed more easily through the sealing structure 6, thereby improving the working reliability of the battery cell 102 and realizing a flexible and diversified design of the sealing structure 6.

[0154] In some embodiments, as shown in FIG12 , the pole cover 4 does not have a portion that stops on the outside of the sealing structure 6 (i.e., the side away from the accommodating cavity 11 ), so that the sealing structure 6 is suitable for being installed on the pole cover 4 from the outside of the pole cover 4 (i.e., the side away from the accommodating cavity 11 ). In this way, by setting the sealing structure 6 to be installed on the pole cover 4 from the outside to seal the liquid injection hole 43, the sealing structure 6 can be installed after liquid injection, which can ensure the sealing of the liquid injection hole 43. The installation position is close to the outside, which facilitates the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 does not adversely affect the connection between the pole body 3 and the pole cover 4, thereby ensuring the reliability of the connection between the pole cover 4 and the pole body 3.

[0155] The sealing structure 6 can be detachable or fixed. For example, when the sealing structure 6 is detachable, it is convenient for maintaining the injection hole 43. For example, when the electrolyte needs to be replenished, the sealing structure 6 can be removed, the injection hole 43 can be opened, and the electrolyte can be replenished into the accommodating cavity 11 through the injection hole 43. Then, the sealing structure 6 can be reinstalled. For example, the sealing structure 6 can be detachably connected to the pole cover 4 by means of threads or screws, thereby facilitating disassembly and assembly.

[0156] Exemplarily, when the sealing structure 6 is in a non-detachable fixed form, the sealing structure 6 can be fixed to the pole cover 4 by welding, riveting, etc., so as to improve the sealing reliability of the sealing structure 6 to the injection hole 43. For example, the injection hole 43 can be in a multi-segment form, and the sealing structure 6 can include a first sealing member 61 that is interference fit with the injection hole 43, and a second sealing member 62 that covers the first sealing member 61 and is welded to the pole cover 4.

[0157] Alternatively, in some embodiments, the second sealing member 62 may be configured to be detachably connected to the pole cover 4 by means of a screw-on fastener, so as to restrict the first sealing member 61 to a position where it is interference-fitted with the liquid injection hole 43 .

[0158] In some embodiments of the present application, as shown in FIG12 , at least a portion of the sealing structure 6 is embedded in the liquid injection hole 43. That is, the sealing structure 6 can be entirely embedded in the liquid injection hole 43, or only a portion of the sealing structure 6 can be embedded in the liquid injection hole 43. Thus, on the one hand, the space within the liquid injection hole 43 can be fully utilized, thereby improving the sealing reliability of the sealing structure 6 on the liquid injection hole 43. On the other hand, the height of the sealing structure 6 protruding from the liquid injection hole 43 can be reduced, reducing the space occupied by the sealing structure 6 outside the pole cover 4, thereby reducing the interference effect on the confluence component 103, increasing the connection area between the confluence component 103 and the pole cover 4, and improving the flow efficiency.

[0159] In some embodiments of the present application, as shown in FIG12 , the first shell wall 13 is an integrally formed cover plate, or, as shown in FIG7 , the housing 1 further includes a second shell wall 14, the first shell wall 13 and at least one second shell wall 14 are integrally formed, and the second shell wall 14 extends toward one side in the thickness direction of the first shell wall 13. Thus, the structural position of the terminal 2 can be flexibly designed, thereby increasing the applicability of the battery cell 102 of the embodiments of the present application.

[0160] It is worth noting that the second shell wall 14 can extend from an edge of the first shell wall 13. When the first shell wall 13 is rectangular, at least one of the four edges of the first shell wall 13 can extend into the second shell wall 14. For example, only one edge of the first shell wall 13 extends into the second shell wall 14. Alternatively, only two edges of the first shell wall 13 can extend into the second shell wall 14. Alternatively, three edges of the first shell wall 13 can extend into the second shell wall 14. Alternatively, all four edges of the first shell wall 13 can extend into the second shell wall 14. For example, when the housing 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 13.

[0161] For example, the shell 1 may include a shell body and a cover plate, the shell body defines a space with one side open, and the cover plate is arranged on the open side of the shell body to form a accommodating cavity 11 between the shell body and the cover plate. At this time, the side surface of the shell body opposite to the cover plate is the first shell wall 13, and the wall surface of the shell body connected between the first shell wall 13 and the cover plate is the second shell wall 14, or, the side surface of the shell body opposite to the cover plate is the second shell wall 14, and the wall surface of the shell body connected between the second shell wall 14 and the cover plate is the first shell wall 13, or, the cover plate is the first shell wall 13, either way.

[0162] According to the second embodiment of the present application, the present embodiment further provides a battery 100, comprising a battery cell 102 according to any of the above-described solutions. It is worth noting that the battery 100 according to the embodiment of the present application may or may not include a housing. As a result, the reliability of the battery cell 102 according to the embodiment of the present application is improved, thereby facilitating improved performance of the battery 100.

[0163] For example, as shown in FIG13 , the battery 100 may further include a busbar 103 , and there may be multiple battery cells 102 , with at least two of them being electrically connected via the busbar 103 . This allows for the series and / or parallel connection of multiple battery cells 102 . For example, when multiple battery cells 102 are connected in series, the anode pole cover 4 of one battery cell 102 is connected to the cathode pole cover 4 of the next battery cell 102 via one busbar 103 , while the cathode pole cover 4 of the battery cell 102 is connected to the anode pole cover 4 of the previous battery cell 102 via another busbar 103 .

[0164] According to a third embodiment of the present application, an electrical device is provided, comprising a battery 100 according to any of the aforementioned solutions, wherein the battery 100 is configured to provide electrical energy to the electrical device. The electrical device may be any of the aforementioned devices or systems employing the battery 100. The improved performance of the battery 100 facilitates improved operating performance of the electrical device.

[0165] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0166] The battery cell 102 includes a housing 1, a terminal 2, and an insulating seal structure 8. The housing 1 includes a first housing wall 13 having a mounting hole 12 therein. The terminal 2 includes a penetration portion 33 that penetrates the mounting hole 12, a first extension portion 32 connected to the penetration portion 33 and extending relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12, and a second extension portion 38 connected to the penetration portion 33 and extending relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The first extension portion 32 extends to the outside of the outer surface of the first housing wall 13, and the second extension portion 38 extends to the inside of the inner surface of the first housing wall 13. The first extension portion 32 of the terminal 2 is formed by flanging and riveting.

[0167] The penetration portion 33 and the first extension portion 32 constitute a first pole portion 35, the insulating sealing structure 8 includes a first insulating seal 85 that is fitted between the first pole portion 35 and the first shell wall 13, the penetration portion 33 and the second extension portion 38 constitute a second pole portion 39, the insulating sealing structure 8 includes a second insulating seal 86 that is fitted between the second pole portion 39 and the first shell wall 13 and is separately arranged from the first insulating seal 85, the first insulating seal 85 is composed of a first part 83 and a second part 84 as an inseparable integral part, and the material hardness of the first part 83 is less than the material hardness of the second part 84, and the first part 83 is arranged at the corner position of the first insulating seal 85.

[0168] The battery cell 102 includes a gasket 9 arranged between the first pole portion 35 and the first shell wall 13, and used to buffer the force applied to the first insulating seal 85 by at least one of the first pole portion 35 and the first shell wall 13. The gasket 9 includes a first gasket 91 and a second gasket 92. The first gasket 91 is arranged between the first extension portion 32 and the first insulating seal 85, and the material hardness of the first gasket 91 is greater than the material hardness of the first insulating seal 85. The second gasket 92 is arranged between the first insulating seal 85 and the side surface of the first shell wall 13 facing the first extension portion 32, and the material hardness of the second gasket 92 is less than the material hardness of the first insulating seal 85.

[0169] During assembly, the first insulating seal 85, the second insulating seal 86 and the pole 2 can be first installed at the mounting hole 12 of the first shell wall 13, and then the first extension portion 32 can be processed by riveting. At this time, the pole 2 will apply a force to the first insulating seal 85, and the first shell wall 13 will apply a reaction force to the first insulating seal 85, causing the weak part of the first insulating seal 85 to crack and be damaged. By providing the first gasket 91 and the second gasket 92 to buffer the force, it is beneficial to improve the problem of cracking at the weak part of the first insulating seal 85 and improve the reliability of the battery cell 102.

[0170] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0171] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: A first shell wall, wherein the first shell wall has a mounting hole; A pole, comprising a penetration portion penetrated in the mounting hole, and a first extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, wherein the first extension portion extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall, and the penetration portion and the first extension portion constitute a first pole portion; A first insulating seal, fitted between the first pole portion and the first shell wall; The cushion is disposed between the first pole portion and the first shell wall and is used to buffer a force applied to the first insulating seal by at least one of the first pole portion and the first shell wall.

2. The battery cell according to claim 1, wherein: The gasket is arranged between the first shell wall and the first insulating seal, and / or between the first pole portion and the first insulating seal.

3. The battery cell according to claim 2, wherein: The gasket includes a first gasket disposed between the first extension portion and the first insulating seal.

4. The battery cell according to claim 3, wherein: The material hardness of the first gasket is greater than the material hardness of the first insulating seal.

5. The battery cell according to claim 3 or 4, wherein: The first gasket protrudes from or is flush with a side surface of the first insulating seal member close to the penetration portion in a direction close to the penetration portion.

6. The battery cell according to any one of claims 2 to 5, wherein: The gasket includes a second gasket, which is arranged between the first insulating seal and a surface of the first shell wall facing the first extension portion, and the material hardness of the second gasket is smaller than the material hardness of the first insulating seal.

7. The battery cell according to any one of claims 2 to 6, wherein: The gasket includes a third gasket, and the third gasket is arranged between the penetration portion and the first insulating seal.

8. The battery cell according to any one of claims 3 to 5, wherein: The gasket also includes a third gasket, which is arranged between the penetration portion and the first insulating seal, and the first gasket and the third gasket are an integral part.

9. The battery cell according to any one of claims 1 to 8, wherein: The cushion is formed into an annular structure extending along the entire circumference of the mounting hole.

10. The battery cell according to any one of claims 1 to 9, wherein: A matching gap is provided between the penetration portion and the first insulating seal.

11. The battery cell according to any one of claims 3 to 5, wherein: The connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, the first shell wall includes a second corner set corresponding to the first corner, and the first insulating seal includes a fourth corner set corresponding to the second corner, wherein the first insulating seal includes a second sub-portion and a second part, the material hardness of the second sub-portion is less than the material hardness of the second part, and the second sub-portion defines the fourth corner.

12. The battery cell according to any one of claims 3 to 5 and 11, wherein: The connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, the first shell wall includes a second corner set corresponding to the first corner, and the first insulating seal includes a fourth corner set corresponding to the second corner, wherein at least one of the second corner and the fourth corner is formed as a chamfer.

13. The battery cell according to claim 6, wherein: The connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, and the first insulating seal includes a third corner set corresponding to the first corner, wherein the first insulating seal includes a first sub-portion and a second portion, the material hardness of the first sub-portion is less than the material hardness of the second portion, and the first sub-portion defines the third corner.

14. The battery cell according to claim 6 or 13, wherein: The connection between the first extension portion and the penetration portion has a first corner arranged toward the first shell wall, and the first insulating seal includes a third corner arranged corresponding to the first corner, wherein at least one of the first corner and the third corner is formed as a chamfer.

15. The battery cell according to any one of claims 1 to 14, wherein: The first extension portion of the pole is formed by flanging and riveting.

16. The battery cell according to any one of claims 1 to 15, wherein: The pole also includes a second extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the second extension portion and the first extension portion extend to the inner and outer sides of the first shell wall respectively, the penetration portion and the second extension portion constitute a second pole portion, and the battery cell also includes a second insulating seal that is fitted between the second pole portion and the first shell wall and is separately arranged from the first insulating seal.

17. The battery cell according to claim 16, wherein: The pole includes a pole body and a pole cover plate, the pole body includes the first pole portion and the second pole portion, the first extension portion extends to the outside of the outer surface of the first shell wall, the pole cover plate is covered on a side of the first pole portion away from the second pole portion, and the pole body is welded to the pole cover plate, and the material hardness of the second insulating seal is less than the material hardness of the first insulating seal.

18. The battery cell according to claim 17, wherein: The first extension portion protrudes from the penetration portion toward the outer side of the first shell wall to define a recessed groove between the first extension portion and the penetration portion. The edge of the pole cover plate is arranged in the recessed groove and is penetrated and welded with the penetration portion. The welding structure formed by welding is spaced apart from the first extension portion.

19. The battery cell according to any one of claims 1 to 18, wherein: The battery cell is provided with a receiving cavity on the inner side of the first shell wall, the pole includes a pole body, the pole body is provided with a receiving groove which is open in a direction away from the receiving cavity, the pole body is provided with a connecting hole, the connecting hole penetrates the groove wall on one side of the receiving groove close to the receiving cavity, and connects the receiving cavity with the receiving groove.

20. The battery cell according to claim 19, wherein: The battery cell comprises a cell assembly, the cell assembly comprises an active material coating portion received in the receiving cavity, and a conductive portion connected to the active material coating portion, the conductive portion is passed through the connecting hole to be at least partially received in the receiving groove.

21. The battery cell according to any one of claims 19 to 20, wherein: The pole includes a pole cover plate which is covered on the pole body, and a liquid injection hole which can be communicated with the receiving groove is formed on the pole cover plate. The battery cell also includes a sealing structure for sealing the liquid injection hole.

22. A battery, wherein: Comprising a battery cell according to any one of claims 1-21.

23. An electrical device, wherein: Comprising a battery according to claim 22.

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