Battery cell, battery, and electric apparatus

Abstract

A battery cell, a battery, and an electric apparatus, which relate to the technical field of batteries. The battery cell comprises: a first housing wall, an electrode post, and an insulating and sealing structure; an installation hole is formed on the first housing wall; the electrode post comprises a pass-through portion that is arranged as passing through the installation hole, and a first extending portion connected to the pass-through portion and extending in the direction, relative to the pass-through portion, away from the central axis of the installation hole; the first extending portion extends to an inner side of the inner surface or an outer side of the outer surface of the first housing wall; and the insulating and sealing structure fits between the electrode post and the first housing wall; wherein the first extending portion comprises a first section and a second section which are sequentially arranged in the direction away from the central axis of the installation hole, and second section presses against the insulating and sealing structure to a greater degree than the first section.

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 202311251687.1 and application date 2023-09-26, 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 and an insulating sealing structure, the first shell wall being formed with a mounting hole, the pole comprising a penetration portion penetrating 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 or the inside of the inner surface of the first shell wall, the insulating sealing structure being fitted between the pole and the first shell wall, wherein the first extension portion comprises a first section and a second section sequentially arranged in a direction away from the central axis of the mounting hole, and the second section has a greater degree of compression on the insulating sealing structure than the first section.

[0008] In the above technical solution, the second section is set to have a greater degree of compression on the insulating sealing structure relative to the first section. In this way, when the second section outside the first section is warped due to influences such as welding, the second section has a greater degree of compression on the insulating sealing structure relative to the first section, thereby improving the problem of insufficient compression of the insulating sealing structure caused by the warping of the second section, thereby improving the sealing reliability between the pole and the shell, and improving the reliability of the battery cell.

[0009] In some embodiments, the amount of compression exerted by the second section on the insulating sealing structure is greater than the amount of compression exerted by the first section on the insulating sealing structure.

[0010] In the above technical solution, since the compression amount of the second section on the insulating sealing structure is greater than that of the first section, when the compression amount of the first section on the insulating sealing structure meets the requirements, there is a compression margin for the compression amount of the second section on the insulating sealing structure, so as to present the effect that the second section presses the insulating sealing structure more tightly than the first section. In this way, when the second section is tilted, the compression margin can be used to compensate for the compression loss caused by the tilting of the second section, so that the compression amount of the tilted second section on the insulating sealing structure still meets the compression requirement, thereby improving the sealing between the shell and the pole, improving the leakage problem, and improving the reliability of the battery cell.

[0011] In some embodiments, a side surface of the first section close to the first shell wall is a first surface, and a side surface of the second section close to the first shell wall is a second surface. The second surface protrudes relative to the first surface toward the first shell wall.

[0012] In the above technical solution, by protruding the second section toward the first housing wall, it is easier to achieve a greater compression of the insulating seal structure by the second section relative to the first section, thereby reserving a certain compression margin. Thus, when the second section tilts relative to the first section and the tilting amplitude is relatively large, the compression margin can offset the compression loss caused by the tilting of the second section, so that the compression of the insulating seal structure by the second section is still sufficient to maintain the seal, thereby alleviating the problem of poor sealing between the housing and the pole caused by the tilting of the second section. Furthermore, by increasing the thickness of the second section by protruding toward the first housing wall, it is easier to achieve a greater mass per unit area of ​​the second section relative to the first section, thereby increasing the difficulty of tilting the second section and thereby reducing the tilting amplitude of the second section, thereby alleviating the problem of the insulation seal structure being unable to be compressed due to the large tilting amplitude of the second section, resulting in poor sealing between the pole and the housing.

[0013] In some embodiments, the first surface extends obliquely along a direction away from the central axis of the mounting hole toward a direction close to the first shell wall.

[0014] In the above technical solution, the problem of a large step formed at the connection between the first surface of the first section and the second surface of the second section can be improved, and the cracking problem caused by large deformation can be improved, thereby improving the structural reliability of the first extension part.

[0015] In some embodiments, the first surface and the second surface are connected by a line or by a chamfer.

[0016] In the above technical solution, no step is formed at the connection between the first surface and the second surface, which can improve the problem of cracking of the first extension portion at the connection on the one hand, and on the other hand, it can improve the problem of cracking of the insulating sealing structure due to concentrated force at the corresponding connection, thereby protecting the insulating sealing structure.

[0017] In some embodiments, the thickness of the second section in the axial direction of the mounting hole is greater than the thickness of the first section in the axial direction of the mounting hole.

[0018] In the above technical solution, by increasing the thickness of the second section and limiting the thickening direction of the second section to the direction toward the first shell wall, the second section can achieve a greater compression of the insulating sealing structure, thereby reserving a certain compression margin to compensate for the compression loss caused by at least partial warping of the second section. At the same time, the warping difficulty of the second section can be increased by increasing the mass of the second section, thereby reducing the warping amplitude of the second section, thereby improving the problem of insufficient compression of the insulating sealing structure due to the warping of the second section, thereby improving the sealing between the pole and the shell.

[0019] In some embodiments, a side surface of the second section away from the first shell wall is flush with a side surface of the first section away from the first shell wall.

[0020] In the above technical solution, the structure and processing of the first extension portion can be simplified.

[0021] In some embodiments, at least half of an extension of the first extension portion in a direction away from the central axis of the mounting hole is in abutment engagement with the first housing wall.

[0022] In the above technical solution, the first extension portion may have a longer size to abut against the first shell wall, thereby more effectively compressing the insulating sealing structure and improving the reliability of the seal.

[0023] 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, and the insulating sealing structure includes a first insulating seal at least partially arranged between the first extension portion and the first shell wall, and a second insulating seal at least partially arranged between the second extension portion and the first shell wall, and the material hardness of the first insulating seal is greater than the material hardness of the second insulating seal.

[0024] In the above technical solution, the pressing force applied by the first extension portion to the first insulating seal can be better transmitted to the second insulating seal, so that the second insulating seal can be better compressed, so that the compression amount of the first insulating seal can be smaller than the compression amount of the second insulating seal, and both the first insulating seal and the second insulating seal can have a better sealing effect.

[0025] In some embodiments, a side surface of the first insulating seal away from the first shell wall matches a shape of a side surface of the first extending portion facing the first shell wall.

[0026] In the above technical solution, the contact area between the first insulating seal and the first extension portion can be increased, and the problem of cracking of the first insulating seal caused by local force concentration can be reduced. Moreover, when the second section protrudes relative to the first section toward the first shell wall, the first extension portion and the first insulating seal can form a concave-convex fit through shape matching, which plays a limiting role. During the vibration and impact of the battery cell, it is beneficial to improve the movement and loosening of the first insulating seal, and improve the setting stability of the first insulating seal, so that the first insulating seal can have a more reliable insulating sealing effect.

[0027] In some embodiments, the pole includes a pole body and a pole cover, the pole body includes a first extension portion and a second extension portion, the first extension portion extends to the outside of the outer surface of the first shell wall, the pole cover is covered on the outside of the pole body, and the pole body and the pole cover are welded together.

[0028] In the above technical solution, by arranging the pole cover plate on the outside of the pole body, the pole cover plate is arranged closer to the first extension portion relative to the second extension portion. The heat generated by the welding of the pole cover plate and the pole body is conducted to the first insulating seal member more than the second insulating seal member. Since the material hardness of the first insulating seal member is greater than the material hardness of the second insulating seal member, the heat resistance of the first insulating seal member is stronger than the heat resistance of the second insulating seal member. For example, the first insulating seal member is a plastic member and the second insulating seal member is a rubber member. Therefore, when the pole body and the pole cover plate are welded, the thermal impact on the second insulating seal member can be minimized, thereby improving the sealing reliability between the first shell wall and the pole.

[0029] 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.

[0030] 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. This can improve the warping problem of the first extension, allowing the first extension to compress the insulating sealing structure and improve the insulating sealing effect. Moreover, because the edge of the pole cover is disposed in the recessed groove and is through-welded to the penetration portion, rather than butt-welded to the first extension, there is no need to ensure a small assembly gap between the edge of the pole cover and the first extension to meet the requirements of butt welding. The gap between the edge of the pole cover and the first extension can be larger, thereby improving the compatibility of the pole body and facilitating the reduction of the processing accuracy of the pole cover and the pole body.

[0031] In some embodiments, the first extension portion of the pole is formed by riveting.

[0032] In the above technical solution, the electrode is easy to manufacture and is conducive to improving the connection reliability between the first extension portion and the penetration portion, and improving the assembly reliability of the electrode and the first shell wall. For example, before riveting, the first extension portion can be configured with a relatively protruding outer surface. After the first extension portion is riveted, the third surface of the first section is flush with the fourth surface of the second section, and the second surface of the second section protrudes relative to the first surface of the first section toward the first shell wall. In this way, during the riveting, the second section can achieve a large amount of compression of the insulating sealing structure relative to the first section, thereby facilitating the compression margin corresponding to the second section and improving the poor sealing problem caused by the warping of the second section.

[0033] In some embodiments, the mass per unit area of ​​the second section is greater than the mass per unit area of ​​the first section.

[0034] In the above technical solution, since the second section has a greater mass per unit area than the first section, it is easier for the second section to tilt compared to the first section, resulting in the second section having a greater degree of compression on the insulating seal structure than the first section. This can reduce the tilting amplitude of the second section to a certain extent, alleviating the problem of the second section's large tilting amplitude preventing the insulating seal structure from being compressed, resulting in a poor seal between the terminal post and the housing. This can improve the sealing between the housing and the terminal post, alleviate leakage issues, and enhance the reliability of the battery cell. Furthermore, by setting the second section to have a greater mass per unit area than the first section, it is easier to achieve a greater compression of the insulating seal structure by the second section relative to the first section. This not only allows the compression margin to compensate for the compression loss caused by the tilting of the second section, but also reduces the tilting amplitude of the second section, thereby more effectively improving the sealing between the housing and the terminal post, alleviates leakage issues, and enhances the reliability of the battery cell.

[0035] In some embodiments, the thickness of the second section is greater than the thickness of the first section; and / or the density of the second section is greater than the density of the first section.

[0036] In the above technical solution, by setting the second section to be larger than at least one of the thickness and density of the first section, it can be easily achieved that the mass of the second section per unit area is larger than that of the first section, thereby reducing the structural complexity of the first extension section and reducing the design and processing difficulty of the first extension section.

[0037] 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.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] 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.

[0042] 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.

[0043] 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.

[0044] 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.

[0045] 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.

[0046] 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

[0047] 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.

[0048] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0049] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0050] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0051] FIG4 is a schematic orthographic projection diagram of a battery cell provided in some embodiments of the present application;

[0052] FIG5 is a cross-sectional view along line AA in FIG4 ;

[0053] FIG6 is a partial enlarged view of the circled portion B in FIG5 ;

[0054] FIG7 is a partial enlarged view of the circled portion C in FIG6 ;

[0055] FIG8 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0056] FIG9 is a diagram of a pole before riveting provided by some embodiments of the present application;

[0057] FIG10 is a diagram of a pole in an unriveted state according to some embodiments of the present application;

[0058] FIG11 is a schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0059] 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 collecting component 103; housing 1; accommodating cavity 11; mounting hole 12; central axis L; first housing wall 13; second housing wall 14; pole 2; pole body 3; recess 31; first extension portion 32; first segment 321; first surface 3211; Third surface 3212; second section 322; second surface 3221; fourth surface 3222; penetration portion 33; accommodating groove 36; connecting hole 37; second extension portion 38; supporting portion 39; pole cover 4; liquid 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; first insulating sealing member 81; second insulating sealing member 82; first portion 821; second portion 822. DETAILED DESCRIPTION

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] In the embodiments of this application, identical reference numerals denote identical components, and for the sake of brevity, detailed descriptions of identical components across different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of 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 do not constitute any limitation on this application.

[0066] The term "plurality" used in this application refers to two or more (including two).

[0067] 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.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] The material of the isolation film is not limited, and can be, for example, polypropylene or polyethylene.

[0074] Some battery cells in the related art have poles installed on their housings. These poles are electrically connected to the cell assembly housed in the housing to achieve electrode output, and an insulating seal is provided between the poles and the housing. The poles extend through the housing and include stop edges that stop on both the inside and outside of the housing. These stop edges are susceptible to warping due to welding and other factors. The closer the stop edges are to the edge, the greater the warping, making it less likely to compress the insulating seal. This results in insufficient compression of the insulating seal, affecting the seal between the housing and the poles.

[0075] To this end, an embodiment of the present application proposes a battery cell, including a shell, a pole and an insulating sealing structure, the shell including a first shell wall, a mounting hole formed on the first shell wall, the pole including a penetration portion penetrating 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 or the inside of the inner surface of the first shell wall, the insulating sealing structure being fitted between the pole and the first shell wall, wherein the first extension portion includes a first section and a second section arranged in sequence along a direction away from the central axis of the mounting hole, and the second section has a greater degree of pressure on the insulating sealing structure than the first section.

[0076] Therefore, the second section is set to have a greater degree of compression on the insulating sealing structure relative to the first section. In this way, when the second section outside the first section is warped due to influences such as welding, the second section has a greater degree of compression on the insulating sealing structure relative to the first section, which can improve the problem of insufficient compression of the insulating sealing structure caused by the warping of the second section, thereby improving the sealing reliability between the pole and the shell, and improving the reliability of the battery cell.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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 .

[0081] 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.

[0082] 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.

[0083] 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.

[0084] 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.

[0085] 5 and 6 , the housing 1 includes a first housing wall 13 having a mounting hole 12 formed 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 is passed through the mounting hole 12, i.e., at least a portion of the penetration portion 33 is located within the mounting hole 12. The projection direction is the axial direction of the mounting hole 12, and the projection of the penetration portion 33 on the projection surface is within the projection range of the mounting hole 12 on the projection surface, with the axial direction of the mounting hole 12 being the projection direction and the surface perpendicular to the axial direction of the mounting hole 12 being the projection surface. This allows the penetration portion 33 to be passed through the mounting hole 12. The type of pole 2 is not limited, and it can be either a cathode pole or an anode pole.

[0086] 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.

[0087] 5 and 6 , the battery cell 102 further includes an insulating sealing structure 8 fitted between the first shell wall 13 and the pole 2. That is, at least a portion of the insulating sealing structure 8 is sandwiched between the first shell wall 13 and the pole 2, so that the pole 2 and the first shell wall 13 are indirectly fitted through the insulating sealing structure 8, thereby achieving insulation and sealing between the first shell wall 13 and the pole 2.

[0088] 6 and 7 , the first extension portion 32 includes a first section 321 and a second section 322 that are sequentially arranged along a direction away from the central axis L of the mounting hole 12 , that is, the second section 322 is arranged relative to the first section 321 and close to the edge of the first extension portion 32 . For example, the portion on the right side of the auxiliary line M shown in FIG7 is the first section 321, and the portion on the left side of the auxiliary line M is the second section 322.

[0089] For example, in conjunction with Figure 6, when the pole 2 includes a pole body 3 and a pole cover 4, and the edge of the pole cover 4 is welded to the first extension 32, the first extension 32 is susceptible to warping due to the influence of welding, and the closer the first extension 32 is to the edge, the more serious the warping. Alternatively, when the pole 2 is an integral part and is welded to the current collecting component 103 provided on the pole 2, the first extension 32 is susceptible to warping due to the influence of welding, and similarly, the closer the first extension 32 is to the edge, the more serious the warping. When the edge of the first extension 32 is warped to a large extent, the edge of the first extension 32 cannot press the insulating sealing structure 8, resulting in insufficient compression of the insulating sealing structure 8, affecting the sealing effect between the shell 1 and the pole 2.

[0090] In order to improve the above technical problems, in an embodiment of the present application, the second section 322 is set to have a greater degree of compression on the insulating sealing structure 8 relative to the first section 321. In this way, when the second section 322 outside the first section 321 is lifted up due to influences such as welding, since the second section 322 has a greater degree of compression on the insulating sealing structure 8 relative to the first section 321, the problem of insufficient compression of the insulating sealing structure 8 caused by the lifting of the second section 322 can be improved, thereby improving the sealing reliability between the pole 2 and the shell 1 and improving the reliability of the battery cell 102.

[0091] It is worth noting that there are many ways to achieve "the second section 322 exerts a greater degree of compression on the insulating sealing structure 8 relative to the first section 321". For example, in some embodiments, the second section 322 is arranged to have a greater compression amount on the insulating sealing structure 8 relative to the first section 321, so as to achieve a greater degree of compression of the second section 322 on the insulating sealing structure 8 relative to the first section 321; for another example, the mass per unit area of ​​the second section 322 is arranged to be greater relative to the first section 321, so as to achieve a greater degree of compression of the second section 322 on the insulating sealing structure 8 relative to the first section 321. Examples are given below.

[0092] In some embodiments, the amount of compression exerted by the second section 322 on the insulating sealing structure 8 is greater than the amount of compression exerted by the first section 321 on the insulating sealing structure 8, i.e., the amount of compression exerted by the second section 322 on the insulating sealing structure 8 relative to the first section 321 is greater, thereby achieving a greater degree of compression of the insulating sealing structure 8 by the second section 322 relative to the first section 321. As shown in Figures 6 and 7, the insulating sealing structure 8 includes a first portion 821 disposed opposite the first section 321 along the axial direction of the mounting hole 12, and a second portion 822 disposed opposite the second section 322 along the axial direction of the mounting hole 12. When the amount of compression exerted by the second portion 822 is greater than the amount of compression exerted by the first portion 821, it can be understood that the amount of compression exerted by the second section 322 on the insulating sealing structure 8 relative to the first section 321 is greater.

[0093] Among them, since the compression amount of the second section 322 on the insulating sealing structure 8 is larger than that of the first section 321, when the compression amount of the first section 321 on the corresponding part of the insulating sealing structure 8 (such as the first part 821) meets the requirements, the compression amount of the second section 322 on the corresponding part of the insulating sealing structure 8 (such as the second part 822) has a compression margin, so as to present the effect that the second section 322 has a larger degree of compression on the insulating sealing structure 8 relative to the first section 321. In this way, when the second section 322 is tilted, the compression loss caused by the tilting of the second section 322 can be compensated by the compression margin, so that the compression amount of the tilted second section 322 on the insulating sealing structure 8 still meets the compression requirement, thereby improving the sealing between the shell 1 and the pole 2, improving the leakage problem, and improving the reliability of the battery cell 102.

[0094] In some embodiments, the second section 322 protrudes relative to the first section 321 toward the first housing wall 13, i.e., a side surface of the second section 322 that is adjacent to the first housing wall 13 (i.e., the second surface 3221 of the second section 322) is positioned closer to the first housing wall 13 relative to a side surface of the first section 321 that is adjacent to the first housing wall 13 (i.e., the first surface 3211 of the first section 321). Thus, by protruding the second section 322 toward the first housing wall 13, the second section 322 can more effectively compress the insulating sealing structure 8 relative to the first section 321, thereby reserving a certain amount of compression margin. Thus, when the second section 322 tilts, the compression margin can offset the compression loss caused by the tilting of the second section 322, so that the compression of the insulating sealing structure 8 by the second section 322 is still sufficient to maintain sealing, thereby improving the problem of poor sealing between the housing 1 and the pole 2 caused by the tilting of the second section 322.

[0095] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the second surface 3221 of the second section 322 can also be set to be flush with the first surface 3211 of the first section 321. At this time, the insulating sealing structure 8 can be set. Before assembly, the side surface of the second part 822 facing the second section 322 is set to be protruding relative to the side surface of the first part 821 facing the first section 321. After assembly, the side surface of the second part 822 facing the second section 322 is compressed to be flush with the side surface of the first part 821 facing the first section 321, thereby indicating that the second part 822 is compressed to a greater degree relative to the first part 821. At this time, the second section 322 can also achieve a large compression of the insulating sealing structure 8 relative to the first section 321. In this way, the second part 822 can also reserve a certain compression margin. When the second section 322 is tilted, the compression margin can offset the compression loss caused by the tilting of the second section 322, so that the compression of the second section 322 on the insulating sealing structure 8 is still sufficient to maintain the sealing, thereby improving the problem of poor sealing between the shell 1 and the pole 2 caused by the tilting of the second section 322.

[0096] In some embodiments, as shown in Figures 6 and 7 , the thickness W2 of the second section 322 in the axial direction of the mounting hole 12 is greater than the thickness W1 of the first section 321 in the axial direction of the mounting hole 12. For example, when the thickness of the second section 322 increases toward the first housing wall 13, the second section 322 can protrude relative to the first section 321 toward the first housing wall 13, thereby easily achieving a greater compression of the insulating sealing structure 8 by the second section 322 relative to the first section 321, thereby reserving a certain compression margin to compensate for the compression loss caused by the warping of the second section 322, thereby improving the problem of poor sealing between the housing 1 and the pole 2 caused by the warping of the second section 322. For another example, when the direction of increasing the thickness of the second section 322 is not limited, if the materials of the first section 321 and the second section 322 are the same or the density is close, it is beneficial to achieve a larger mass per unit area of ​​the second section 322 relative to the first section 321, thereby facilitating increasing the difficulty of the second section 322 to tilt, thereby reducing the tilting amplitude of the second section 322, and improving the problem of the inability to compress the insulating sealing structure 8 due to the large tilting amplitude of the second section 322, resulting in poor sealing between the pole 2 and the shell 1.

[0097] In some embodiments, as shown in Figures 6 and 7 , a side surface of the first section 321 near the first housing wall 13 (i.e., a first surface 3211 of the first section 321) is configured to extend obliquely in a direction away from the central axis L of the mounting hole 12 toward the first housing wall 13. Thus, when the second section 322 protrudes relative to the first section 321 toward the first housing wall 13, the problem of a large step formed at the junction between the side surface of the first section 321 near the first housing wall 13 (i.e., the first surface 3211 of the first section 321) and the side surface of the second section 322 near the first housing wall 13 (i.e., the second surface 3221 of the second section 322) can be alleviated, thereby improving the problem of cracking caused by large deformation and enhancing the structural reliability of the first extension portion 32.

[0098] In some embodiments, as shown in Figures 6 and 7, the side surface of the second section 322 close to the first shell wall 13 (i.e., the second surface 3221 of the second section 322) is constructed to be parallel to the plane of the first shell wall 13, so as to facilitate processing, and can better control the compression amount of the insulating sealing structure 8, and improve the cracking problem of the insulating sealing structure 8.

[0099] In some embodiments, as shown in Figures 6 and 7, when the first surface 3211 extends obliquely along a direction away from the central axis L of the mounting hole 12 toward a direction closer to the first shell wall 13, the first surface 3211 and the second surface 3221 are connected by a line or by a chamfer (such as a rounded corner or a chamfered corner). As a result, no step is formed at the connection between the first surface 3211 and the second surface 3221. This can, on the one hand, alleviate the problem of cracking of the first extension portion 32 at this connection, and on the other hand, alleviate the problem of cracking of the insulating sealing structure 8 due to concentrated force at the corresponding connection, thereby protecting the insulating sealing structure 8.

[0100] In some embodiments, when the second section 322 protrudes relative to the first section 321 toward the first shell wall 13, the thickness W2 of the second section 322 in the axial direction of the mounting hole 12 can be set to be greater than the thickness W1 of the first section 321 in the axial direction of the mounting hole 12. When the thickness is not a constant value, the average thickness can be used as the thickness.

[0101] Therefore, by increasing the thickness of the second section 322 and limiting the thickening direction of the second section 322 to the direction toward the first shell wall 13, the second section 322 can achieve a greater compression of the insulating sealing structure 8, thereby reserving a certain compression margin to compensate for the compression loss caused by at least partial warping of the second section 322. At the same time, the warping difficulty of the second section 322 can be increased by increasing the mass of the second section 322, thereby reducing the warping amplitude of the second section 322, so as to improve the problem of insufficient compression of the insulating sealing structure 8 due to the warping of the second section 322, thereby improving the sealing between the pole 2 and the shell 1.

[0102] For example, the side surface of the second section 322 away from the first shell wall 13 (i.e., the fourth surface 3222 of the second section 322) can be set to be flush with the side surface of the first section 321 away from the first shell wall 13 (i.e., the third surface 3212 of the first section 321). This not only simplifies the structure and processing of the first extension portion 32. For example, the first extension portion 32 processed by riveting has the third surface 3212 and the fourth surface 3222 flush, but also can easily achieve that the second section 322 is set to have a thickness in the axial direction of the mounting hole 12 that is greater than the thickness of the first section 321 in the axial direction of the mounting hole 12, and the second section 322 protrudes relative to the first section 321 toward the direction close to the first shell wall 13.

[0103] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the fourth surface 3222 of the second section 322 can also be set to protrude from the third surface 3212 of the first section 321 in the direction away from the first shell wall 13, or the fourth surface 3222 of the second section 322 can also be set to be recessed in the third surface 3212 of the first section 321 in the direction close to the first shell wall 13, so as to achieve "the second section 322 is set to have a thickness in the axial direction of the mounting hole 12 greater than the thickness of the first section 321 in the axial direction of the mounting hole 12, and the second section 322 protrudes relative to the first section 321 in the direction close to the first shell wall 13".

[0104] In some embodiments, as shown in Figures 6 and 7 , at least half of the extension of the first extension portion 32 in a direction away from the central axis L of the mounting hole 12 is in abutment with the first housing wall 13. This abutment refers to indirect contact through the insulating sealing structure 8. Specifically, with the axial direction of the mounting hole 12 as the projection direction and a plane perpendicular to the axial direction of the mounting hole 12 as the projection plane, the projection of the first extension portion 32 on the projection plane and the projection of the first housing wall 13 on the projection plane have an intersection area, and the portion of the first extension portion 32 corresponding to the intersection area is in abutment with the first housing wall 13.

[0105] For example, as shown in FIG7 , the radial dimension of the portion of the first extension portion 32 corresponding to the intersection region of the mounting hole 12 is L3, and the radial dimension of the first extension portion 32 of the mounting hole 12 is L0, where L3 ≥ L0 / 2 (as shown in FIG7 ). It is worth noting that the shape of the mounting hole 12 is not limited, and can be, for example, circular, rectangular, elliptical, or racetrack-shaped. For non-circular mounting holes 12, the radial dimension of the mounting hole 12 can include both the width and length of the mounting hole 12.

[0106] In short, by making at least half of the first extension portion 32 in the extension direction abut against the first shell wall 13, the first extension portion 32 can have a longer size and abut against the first shell wall 13, so as to more effectively compress the insulating sealing structure 8 and improve the reliability of the seal.

[0107] In some embodiments, as shown in Figures 6 and 7, the portion where the first extension portion 32 abuts against the first shell wall 13 has an extension dimension L3 in the direction away from the center axis L of the mounting hole 12, and the wall thickness of the first shell wall 13 is D, where 0.5D≤L3≤2D. Thus, the size of the portion where the first extension portion 32 abuts against the first shell wall 13 is close to or greater than the thickness of the first shell wall 13, so that the first extension portion 32 can have a relatively long size to abut against the first shell wall 13, so as to more effectively compress the insulating sealing structure 8 and improve the reliability of the seal.

[0108] In some embodiments, as shown in Figures 6 and 7 , the first segment 321 extends in a direction away from the central axis L of the mounting hole 12 by a dimension L1, the second segment 322 extends in a direction away from the central axis L of the mounting hole 12 by a dimension L2, and the first surface 3211 is tilted in the axial direction of the mounting hole 12 by an amplitude H, where L2 is less than or equal to twice H, i.e., L2 ≤ 2H. As a result, the surface of the first extension 32 facing the insulating sealing structure 8 deforms more slowly, effectively preventing cracking of the insulating sealing structure 8.

[0109] In some embodiments, as shown in Figures 6 and 7, H ≤ L1 / 2, which can minimize the inclination of the first surface 3211. Due to the high structural reliability of the first section 321, the second section 322 and the penetration portion 33 can be more reliably connected, thereby improving the reliability of the first extension 32's compression of the insulating sealing structure 8. Furthermore, the minimal inclination angle of the first surface 3211 can reduce local pressure on the insulating sealing structure 8, thereby improving the cracking problem of the insulating sealing structure 8.

[0110] In some embodiments, as shown in Figures 6 and 7, L1 < L2, so that the size of the second section 322 is larger than that of the first section 321, making it less likely for the second section 322 to warp up, and thus making it easier for the second section 322 to press the insulating sealing structure 8 against the first section 321, which helps to increase the degree of compression of the second section 322 on the insulating sealing structure 8, thereby better improving the problem of insufficient compression of the insulating sealing structure 8 caused by the warping of the second section 322. Moreover, because the size of the second section 322 is larger than that of the first section 321, when the degree of compression of the second section 322 on the insulating sealing structure 8 relative to the first section 321 is greater, the pressure of the second section 322 on the insulating sealing structure 8 can be reduced, thereby improving the problem of cracking of the insulating sealing structure 8.

[0111] In some embodiments, as shown in Figures 6 and 7 , the radial dimension of the first extension portion 32 in the mounting hole 12 is L0, and the thickness of the second segment 322 in the axial direction of the mounting hole 12 is W2, where L0 ≥ 1 mm and W2 ≥ 0.5 mm. For example, L0 is 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, or 2 mm, and W2 is 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, or 1 mm, etc. Thus, the first extension portion 32 can have a relatively large extension dimension to form the second segment 322, and the second segment 322 has a relatively large thickness. This allows the second segment 322 to more effectively abut against the first shell wall 13, thereby more effectively compressing the insulating sealing structure 8 and improving sealing reliability.

[0112] When the pole body 3 and the pole cover 4 are welded, the weld seam solidifies and shrinks, which can easily cause the edge of the first extension portion 32 to warp and deform, reducing the compression of the outer ring of the insulating seal structure 8, resulting in a poor seal and leaks. In some embodiments of the present application, by defining the size and shape of the first extension portion 32 as described above, the first extension portion 32 is formed to extend in a direction away from the central axis L of the mounting hole 12, and the edge protrudes and thickens toward the first shell wall 13. This increases the compression of the insulating seal structure 8 by the edge of the first extension portion 32, and provides a certain amount of compression margin. When the edge of the first extension portion 32 warps due to welding, the compression margin can compensate for the compression loss caused by the warping of the edge of the first extension portion 32, ensuring that the compression of the insulating seal structure 8 remains sufficient. This can solve the problem of insufficient compression of the sealing ring caused by the large warping of the edge of the first extension portion 32 due to thermal contraction of the weld seam.

[0113] In some embodiments, as shown in Figures 6 and 7, the pole 2 further 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. That is, when the first extension portion 32 extends to the outer side of the outer surface of the first housing wall 13, the second extension portion 38 extends to the inner side of the inner surface of the first housing wall 13, and when the first extension portion 32 extends to the inner side of the inner surface of the first housing wall 13, the second extension portion 38 extends to the outer side of the outer surface of the first housing wall 13. The insulating sealing structure 8 includes a first insulating seal 81 at least partially disposed between the first extension portion 32 and the first housing wall 13, and a second insulating seal 82 at least partially disposed between the second extension portion 38 and the first housing wall 13. The first insulating seal 81 and the second insulating seal 82 are two separate parts, and the material hardness of the first insulating seal 81 is greater than the material hardness of the second insulating seal 82.

[0114] In this way, the compressive force applied by the first extension portion 32 to the first insulating seal 81 can be effectively transmitted to the second insulating seal 82, thereby effectively compressing the second insulating seal 82. This allows the compression of the first insulating seal 81 to be less than that of the second insulating seal 82, and both the first insulating seal 81 and the second insulating seal 82 to effectively seal. Furthermore, it is worth noting that when the insulating sealing structure 8 includes the first insulating seal 81 and the second insulating seal 82, the second segment 322 compresses the insulating sealing structure 8 more than the first segment 321. This can be understood as: the second segment 322 compresses the second insulating seal 82 more than the first segment 321.

[0115] In some embodiments, as shown in Figures 6 and 7, when the material hardness of the first insulating seal 81 is greater than the material hardness of the second insulating seal 82, the surface of the first insulating seal 81 away from the first shell wall 13 is configured to match the shape of the surface of the first extension 32 facing the first shell wall 13. This can increase the contact area between the first insulating seal 81 and the first extension 32, reducing the problem of cracking of the first insulating seal 81 caused by localized force concentration. Moreover, when the second section 322 protrudes relative to the first section 321 toward the first shell wall 13, the shape matching can form a concave-convex fit between the first extension 32 and the first insulating seal 81, acting as a limiter. This helps to reduce the problem of movement and loosening of the first insulating seal 81 during vibration and impact of the battery cell 102, so that the first insulating seal 81 will not move out of the sealed fit position, thereby improving the stability of the first insulating seal 81 and ensuring that the first insulating seal 81 provides a more reliable insulating seal.

[0116] In some embodiments of the present application, as shown in Figures 6 and 7, the pole 2 includes a pole body 3 and a pole cover 4, the pole body 3 includes a first extension portion 32 and a second extension portion 38, 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 outside of the pole body 3, and the pole body 3 and the pole cover 4 are welded together.

[0117] Thus, by covering the pole cover 4 on the outside of the pole body 3, the pole cover 4 is arranged closer to the first extension portion 32 relative to the second extension portion 38. The heat generated by the welding of the pole cover 4 and the pole body 3 is conducted more to the first insulating seal 81 than to the second insulating seal 82. Since the material hardness of the first insulating seal 81 is greater than the material hardness of the second insulating seal 82, the heat resistance of the first insulating seal 81 is stronger than the heat resistance of the second insulating seal 82. For example, the first insulating seal 81 is a plastic part and the second insulating seal 82 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 82 can be minimized, thereby improving the sealing reliability between the first shell wall 13 and the pole 2.

[0118] In some embodiments of the present application, as shown in Figure 8, 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.

[0119] As a result, 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 32, thereby improving the warping problem of the first extension portion 32, allowing the first extension portion 32 to press against the insulating sealing structure 8, thereby improving the insulating 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. The gap between the edge of the pole cover plate 4 and the first extension portion 32 can be larger, thereby improving the compatibility of the pole body 3 and facilitating the reduction of the processing accuracy of the pole cover plate 4 and the pole body 3.

[0120] In some embodiments of the present application, as shown in Figures 9 and 10 , the first extension portion 32 of the terminal 2 is formed by flanging and riveting. For example, Figure 9 shows the terminal 2 before riveting, while Figure 10 shows the terminal 2 after riveting. Specifically, after the terminal 2 is assembled into the mounting hole 12 via the penetration portion 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 penetration portion 33, thereby improving the assembly reliability of the terminal 2 and the first shell wall 13.

[0121] For example, before the first extension portion 32 is riveted, the first extension portion 32 can be set to a structure with a relatively protruding outer surface of the outer end. After the first extension portion 32 is riveted with a flanging, the third surface 3212 of the first section 321 obtained is flush with the fourth surface 3222 of the second section 322, and the second surface 3221 of the second section 322 protrudes toward the first shell wall 13 relative to the first surface 3211 of the first section 321. In this way, at the same time as the flanging is riveted, the second section 322 can achieve a large compression amount on the insulating sealing structure 8 relative to the first section 321, thereby facilitating the insulating sealing structure 8 to obtain a compression margin at the corresponding second section 322, thereby improving the poor sealing problem caused by the warping of the second section 322.

[0122] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the pole 2 may also be formed by welding two parts together. For example, the two parts are separately assembled into the mounting holes 12 and then welded together. It is understood that when the pole 2 is assembled to the first shell wall 13 by other means besides riveting, the insulating sealing structure 8 may also be squeezed.

[0123] In some embodiments of the present application, the mass per unit area of ​​the second section 322 can be set to be greater than the mass per unit area of ​​the first section 321, that is, the mass per unit area of ​​the second section 322 is greater than that of the first section 321, so that the second section 322 can exert a greater degree of pressure on the insulating sealing structure 8 than the first section 321. Since the mass per unit area of ​​the second section 322 is greater than that of the first section 321, it is more difficult for the second section 322 to tilt compared to the first section 321, thereby achieving a greater degree of pressure on the insulating sealing structure 8 than the first section 321. In this way, the tilting amplitude of the second section 322 can be reduced to a certain extent, thereby alleviating the problem of poor sealing between the terminal 2 and the housing 1 due to the large tilting amplitude of the second section 322, which prevents the insulating sealing structure 8 from being pressed tightly. This can improve the sealing between the housing 1 and the terminal 2, alleviate leakage problems, and enhance the reliability of the battery cell 102.

[0124] It is worth noting that when the second section 322 has a greater mass per unit area than the first section 321, the amount of compression of the insulating sealing structure 8 by the second section 322 relative to the first section 321 is not necessarily greater. Specifically, when the amount of compression of the insulating sealing structure 8 by the second section 322 relative to the first section 321 is greater, and the mass per unit area of ​​the second section 322 is greater than that of the first section 321, the degree of compression of the insulating sealing structure 8 by the second section 322 relative to the first section 321 can be more effectively achieved. Thus, by providing a greater mass per unit area than the first section 321, the amount of compression of the insulating sealing structure 8 by the second section 322 relative to the first section 321 is more easily achieved. This not only allows the compression margin to compensate for the compression loss caused by the warping of the second section 322, but also reduces the extent of the warping of the second section 322, thereby more effectively improving the sealing between the housing 1 and the terminal 2, alleviating leakage issues, and enhancing the reliability of the battery cell 102.

[0125] In some embodiments, the thickness of the second section 322 is greater than the thickness of the first section 321; and / or the density of the second section 322 is greater than the density of the first section 321, that is, the second section 322 is greater than at least one of the thickness and density of the first section 321, that is, the density of the second section 322 is greater than the density of the first section 321, or the thickness of the second section 322 is greater than the thickness of the first section 321, or the density and thickness of the second section 322 are respectively greater than the density and thickness of the first section 321. The thickness refers to the dimension along the axial direction of the mounting hole 12. When the thickness is not a constant value, the thickness refers to the average thickness.

[0126] Therefore, by setting the second section 322 to be larger than at least one of the thickness and density of the first section 321, it can be easily achieved that the second section 322 has a larger mass per unit area than the first section 321, thereby reducing the structural complexity of the first extension portion 32 and reducing the design and processing difficulty of the first extension portion 32.

[0127] Of course, the present application is not limited to this. For example, in other embodiments of the present application, the second section 322 or the first section 321 can be set as a composite structure composed of multiple parts, or some parts can be dug out from the first section 321, so that the mass per unit area of ​​the second section 322 is larger than that of the first section 321.

[0128] In some embodiments, the first section 321 and the second section 322 are made of the same material, a surface of the side of the second section 322 away from the first shell wall 13 is flush with a surface of the side of the first section 321 away from the first shell wall 13, and the second section 322 protrudes relative to the first section 321 toward the first shell wall 13. Therefore, by protruding toward the first shell wall 13 to increase the thickness of the second section 322, it is easy to achieve a larger mass per unit area of ​​the second section 322 relative to the first section 321, thereby not only increasing the compression amount of the second section 322 on the corresponding position of the insulating sealing structure 8, but also increasing the difficulty of the second section 322 to tilt, thereby reducing the tilting amplitude of the second section 322, and improving the problem of poor sealing between the pole 2 and the shell 1 due to the large tilting amplitude of the second section 322.

[0129] In some embodiments of the present application, as shown in Figures 5 and 6, 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 penetrates 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 39 located in the inner ring region of the penetration portion 33.

[0130] 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.

[0131] In some embodiments of the present application, as shown in Figures 5 and 6, the battery cell 102 includes a cell assembly 7, and 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, and the conductive portion 72 is provided in the connecting hole 37 to be at least partially received in the accommodating groove 36. It is worth noting that there can be one or more connecting holes 37, and the conductive portion 72 can be provided in at least one of the connecting holes 37. Exemplarily, at least one connecting hole 37 can pass through the electrolyte. For example, at least one connecting hole 37 is vacant (that is, the conductive portion 72 is not provided), so that the electrolyte can pass through without being hindered by the conductive portion 72. For another example, at least one connecting hole 37 can still pass through the electrolyte after the conductive portion 72 is provided.

[0132] 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.

[0133] 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.

[0134] 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 FIG6 , 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.

[0135] In some embodiments of the present application, as shown in Figures 5 and 6, 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.

[0136] 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.

[0137] 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.

[0138] In some embodiments, as shown in FIG6 , the pole cover plate 4 does not have a portion that stops on the outside of the sealing structure 6 (i.e., the side away from the accommodating cavity 11 ), so that the sealing structure 6 is suitable for being installed on the pole cover plate 4 from the outside of the pole cover plate 4 (i.e., the side away from the accommodating cavity 11 ). In this way, by setting the sealing structure 6 to be installed on the pole cover plate 4 from the outside to seal the liquid injection hole 43, the sealing structure 6 can be installed after liquid injection, which can ensure the sealing of the liquid injection hole 43. The installation position is close to the outside, which facilitates the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 does not adversely affect the connection between the pole body 3 and the pole cover plate 4, thereby ensuring the reliability of the connection between the pole cover plate 4 and the pole body 3.

[0139] 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.

[0140] 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.

[0141] 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 .

[0142] In some embodiments of the present application, as shown in FIG6 , 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.

[0143] In some embodiments of the present application, the first shell wall 13 is an integrally formed cover plate, or, as shown in FIG5 , 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.

[0144] 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.

[0145] 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.

[0146] 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.

[0147] For example, as shown in FIG11 , 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 .

[0148] 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.

[0149] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0150] The battery cell 102 includes a housing 1, a terminal 2, and an insulating sealing structure 8. The housing 1 includes a first housing wall 13 having a mounting hole 12 therein. The terminal 2 includes a terminal body 3 and a terminal cover 4, which is disposed on the outside of the terminal body 3. The terminal body 3 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.

[0151] The first extension portion 32 includes a first section 321 and a second section 322 that are sequentially arranged along a direction away from the central axis L of the mounting hole 12. The thickness of the second section 322 in the axial direction of the mounting hole 12 is greater than the thickness of the first section 321 in the axial direction of the mounting hole 12. A side surface of the first section 321 close to the first shell wall 13 is a first surface 3211, and a side surface of the second section 322 close to the first shell wall 13 is a second surface 3221. The first surface 3211 extends obliquely along the direction away from the central axis L of the mounting hole 12 toward the direction close to the first shell wall 13. The second surface 3221 is parallel to the first shell wall 13. The first surface 3211 and the second surface 3221 are linearly connected so that the second surface 3221 protrudes relative to the first surface 3211 toward the direction close to the first shell wall 13. For example, before the pole 2 is riveted, the portion corresponding to the first extension portion 32 can be set to a trapezoidal shape, and after riveting, the second section 322 can be protruded relative to the first section 321 toward the first shell wall 13 .

[0152] The penetration portion 33 and the first extension portion 32 form a first pole portion. The insulating sealing structure 8 includes a first insulating seal 81 that fits between the first pole portion and the first shell wall 13. The penetration portion 33 and the second extension portion 38 form a second pole portion. The insulating sealing structure 8 includes a second insulating seal 82 that fits between the second pole portion and the first shell wall 13. The second insulating seal 82 is provided separately from the first insulating seal 81. The first insulating seal 81 is a plastic component, and the second insulating seal 82 is a rubber component. The material hardness of the first insulating seal 81 is greater than that of the second insulating seal 82. The side surface of the first insulating seal 81 facing away from the first shell wall 13 matches the shape of the side surface of the first extension portion 32 facing the first shell wall 13. The second insulating seal 82 includes a first portion 821 disposed opposite the first segment 321 along the axial direction of the mounting hole 12, and a second portion 822 disposed opposite the second segment 322 along the axial direction of the mounting hole 12.

[0153] During assembly, the first insulating seal 81, the second insulating seal 82 and the pole body 3 can be first installed in 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 first extension portion 32 will apply a force to the first insulating seal 81, and the first insulating seal 81 applies a force to the second insulating seal 82 through the first shell wall 13. Since the second section 322 protrudes relative to the first section 321 in the direction close to the first shell wall 13, the compression amount of the second portion 822 is greater than the compression amount of the first portion 821.

[0154] Thus, the insulating sealing structure 8 can reserve a certain amount of compression margin at the position corresponding to the second section 322. When the pole cover 4 and the pole body 3 shrink and deform during welding, causing the second section 322 to tilt, the insulating sealing structure 8 has a compression margin at the position corresponding to the second section 322. This compression margin can be used to compensate for the compression loss caused by the tilting of the second section 322, ensuring that the compression of the insulating sealing structure 8 at the position corresponding to the second section 322 remains sufficient, thereby improving the sealing reliability and resolving the problem of sealing failure and leakage caused by excessive compression loss. In addition, because the side surface of the first insulating seal 81 facing away from the first shell wall 13 matches the shape of the side surface of the first extension 32 facing the first shell wall 13, it is helpful to reduce the risk of the first insulating seal 81 loosening under vibration and impact, thereby improving the installation stability of the first insulating seal 81 and the reliability of the insulating seal.

[0155] 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.

[0156] 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 is formed with 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, wherein the first extension portion extends to the outside of the outer surface or the inside of the inner surface of the first shell wall; An insulating sealing structure is fitted between the pole and the first shell wall, wherein the first extension portion includes a first section and a second section arranged in sequence along a direction away from the central axis of the mounting hole, and the second section has a greater degree of compression on the insulating sealing structure than the first section.

2. The battery cell according to claim 1, wherein: The compression amount of the insulating sealing structure caused by the second section is greater than the compression amount of the insulating sealing structure caused by the first section.

3. The battery cell according to claim 2, wherein: A side surface of the first section close to the first shell wall is a first surface, a side surface of the second section close to the first shell wall is a second surface, and the second surface protrudes relative to the first surface toward the first shell wall.

4. The battery cell according to claim 3, wherein: The first surface extends obliquely along a direction away from a central axis of the mounting hole toward a direction close to the first shell wall.

5. The battery cell according to claim 4, wherein: The first surface and the second surface are connected via a line or via a chamfer.

6. The battery cell according to any one of claims 3 to 5, wherein: The thickness of the second section in the axial direction of the mounting hole is greater than the thickness of the first section in the axial direction of the mounting hole.

7. The battery cell according to claim 6, wherein: A surface of one side of the second section away from the first shell wall is flush with a surface of one side of the first section away from the first shell wall.

8. The battery cell according to any one of claims 3 to 7, wherein: At least half of the extension dimension of the first extension portion in a direction away from the central axis of the mounting hole is abutted against the first shell wall.

9. The battery cell according to any one of claims 2 to 8, 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 insulating sealing structure includes a first insulating seal at least partially disposed between the first extension portion and the first shell wall, and a second insulating seal at least partially disposed between the second extension portion and the first shell wall, the material hardness of the first insulating seal being greater than the material hardness of the second insulating seal.

10. The battery cell according to claim 9, wherein: A side surface of the first insulating seal member away from the first shell wall matches a shape of a side surface of the first extending portion facing the first shell wall.

11. The battery cell according to claim 9 or 10, wherein: The pole includes a pole body and a pole cover plate, the pole body includes the first extension portion and the second extension 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 the outside of the pole body, and the pole body is welded to the pole cover plate.

12. The battery cell according to claim 11, 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.

13. The battery cell according to any one of claims 1 to 12, wherein: The first extension portion of the pole is formed by flanging and riveting.

14. The battery cell according to any one of claims 1 to 13, wherein: The mass per unit area of ​​the second section is greater than the mass per unit area of ​​the first section.

15. The battery cell according to claim 14, wherein: The thickness of the second section is greater than the thickness of the first section; and / or, The density of the second section is greater than the density of the first section.

16. The battery cell according to any one of claims 1 to 15, 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.

17. The battery cell according to claim 16, 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.

18. The battery cell according to any one of claims 16 to 17, 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.

19. A battery, wherein: The invention comprises a battery cell according to any one of claims 1 to 18.

20. An electrical device, wherein: Comprising a battery according to claim 19.

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