Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. The single battery comprises a first shell wall, a pole and an insulation sealing structure, a mounting hole is formed in the first shell wall, and the pole comprises a penetrating part penetrating through the mounting hole and a first extending part which is connected with the penetrating part and extends in the direction away from the central axis of the mounting hole relative to the penetrating part; the first extension part extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall, the insulation sealing structure is matched between the pole and the first shell wall, and the first extension part comprises a first section part and a second section part which are sequentially arranged in the direction away from the central axis of the mounting hole; and the second section part has a large compression degree on the insulation sealing structure relative to the first section part. According to the battery monomer, the sealing reliability of the insulation sealing structure is improved, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] 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

[0002] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. Among them, power batteries include several battery cells, however, the reliability of battery cells needs to be improved. Summary of the invention

[0003] 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.

[0004] In a first aspect, an embodiment of the present application provides a battery cell, comprising: a first shell wall, a pole and an insulating sealing structure, wherein the 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, the first extension portion extends to the outside of the outer surface or the inside of the inner surface of the first shell wall, and the insulating sealing structure is fitted between the pole and the first shell wall, wherein the first extension portion comprises a first section portion and a second section portion sequentially arranged along a direction away from the central axis of the mounting hole, and the second section portion has a greater degree of compression on the insulating sealing structure than the first section portion.

[0005] In the above technical solution, the second section is arranged 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 lifted up due to influences such as welding, since the second section has a greater degree of compression on the insulating sealing structure relative to the first section, the problem of insufficient compression of the insulating sealing structure caused by the lifting of the second section can be improved, thereby improving the sealing reliability between the pole and the shell, and improving the reliability of the battery cell.

[0006] 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.

[0007] In the above technical solution, since the compression amount of the insulating sealing structure by the second section is larger than that by the first section, when the compression amount of the insulating sealing structure by the first section meets the requirements, there is a compression margin for the compression amount of the insulating sealing structure by the second section, 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 warped, the compression margin can be used to compensate for the compression loss caused by the warping of the second section, so that the compression amount of the insulating sealing structure by the warped second section 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.

[0008] In some embodiments, 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.

[0009] In the above technical solution, by protruding the second section toward the direction close to the first shell wall, it is easy to achieve a large compression amount of the second section relative to the first section on the insulating sealing structure, so that a certain compression margin can be reserved. In this way, when the second section is tilted 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 amount of the second section on the insulating sealing structure is still sufficient to maintain the sealing, thereby improving the problem of poor sealing between the shell and the pole due to the tilting of the second section. And / or by protruding toward the direction close to the first shell wall to increase the thickness of the second section, it is easy to achieve a large mass per unit area of ​​the second section relative to the first section, thereby increasing the difficulty of tilting the second section, thereby reducing the tilting amplitude of the second section, and improving the problem that the insulating sealing structure cannot be pressed due to the large tilting amplitude of the second section, resulting in poor sealing between the pole and the shell.

[0010] In some embodiments, 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.

[0011] 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.

[0012] In some embodiments, the first surface and the second surface are connected by a line or by a chamfer.

[0013] In the above technical solution, no step will be formed at the connection between the first surface and the second surface, which can improve the problem of cracking of the first extension part at the connection on the one hand, and improve the problem of cracking of the insulating sealing structure due to concentrated force at the corresponding connection on the other hand, thereby protecting the insulating sealing structure.

[0014] 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.

[0015] 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, it is possible to achieve a greater compression amount of the second section on 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, so as to improve 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.

[0016] 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.

[0017] In the above technical solution, the structure and processing of the first extension portion can be simplified.

[0018] In some embodiments, 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.

[0019] In the above technical solution, the first extension portion can have a longer size to abut against the first shell wall, so as to more effectively compress the insulating sealing structure and improve the reliability of the sealing.

[0020] 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 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, and the material hardness of the first insulating seal is greater than the material hardness of the second insulating seal.

[0021] 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.

[0022] In some embodiments, a side surface of the first insulating seal away from the first shell wall matches the shape of a side surface of the first extending portion facing the first shell wall.

[0023] 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 toward the first shell wall relative to the first section, 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.

[0024] In some embodiments, the pole includes a pole body and a pole cover plate, 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 plate is covered on the outside of the pole body, and the pole body is welded to the pole cover plate.

[0025] In the above technical solution, by arranging the pole cover plate on the outside of the pole body, the pole cover plate is arranged close 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 more transmitted to the first insulating seal than to the second insulating seal. Since the material hardness of the first insulating seal is greater than the material hardness of the second insulating seal, the heat resistance of the first insulating seal is stronger than that of the second insulating seal. For example, the first insulating seal is a plastic part and the second insulating seal is a rubber part. Therefore, when the pole body and the pole cover plate are welded, the thermal impact on the second insulating seal can be minimized, thereby improving the sealing reliability between the first shell wall and the pole.

[0026] In some embodiments, the first extension portion protrudes out of 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 with the penetration portion. The welding structure formed by welding is separated from the first extension portion.

[0027] In the above technical solution, the shrinkage stress generated by the solidification of the molten pool formed by welding can be blocked by the above-mentioned interval, and is difficult or less transmitted to the first extension part, thereby improving the warping problem of the first extension part, so that the first extension part can compress the insulating sealing structure and improve the insulating sealing effect. In addition, since the edge of the pole cover plate is arranged in the sink and is penetrated and welded with the penetration part, rather than being butt-welded with the first extension part, it is not necessary to ensure that the assembly gap between the edge of the pole cover plate and the first extension part is small in order to meet the butt welding requirements, so that the interval between the edge of the pole cover plate and the first extension part can be larger, thereby improving the compatibility of the pole body, which is conducive to reducing the processing accuracy of the pole cover plate and the pole body.

[0028] In some embodiments, the first extension portion of the pole is formed by riveting with flanges.

[0029] In the above technical solution, the processing of the pole is convenient, and it is conducive to improving the connection reliability between the first extension part and the penetration part, and improving the assembly reliability of the pole and the first shell wall. For example, before the first extension part is riveted, the first extension part can be set with a relatively protruding structure on the outer surface without external support. After the first extension part is riveted by flanging, the third surface of the first section obtained is flush with the fourth surface of the second section, and the second surface of the second section protrudes toward the direction of the first shell wall relative to the first surface of the first section. In this way, when the flanging is riveted, the second section can achieve a large compression amount 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.

[0030] In some embodiments, the mass per unit area of ​​the second section is greater than the mass per unit area of ​​the first section.

[0031] In the above technical solution, since the mass per unit area of ​​the second section is larger than that of the first section, the difficulty of the second section to lift up can be increased compared with that of the first section, so as to present the effect that the second section has a greater degree of compression on the insulating sealing structure than that of the first section. In this way, the lifting amplitude of the second section can be reduced to a certain extent, and the problem that the insulating sealing structure cannot be compressed due to the large lifting amplitude of the second section, resulting in poor sealing between the pole and the shell, can be improved, thereby improving the sealing between the shell and the pole, improving the leakage problem, and improving the reliability of the battery cell. In addition, by setting the mass per unit area of ​​the second section to be larger than that of the first section, it is easy to achieve a large compression amount of the second section relative to the first section on the insulating sealing structure, so that not only can the compression margin be used to compensate for the compression loss caused by the lifting of the second section, but also the lifting amplitude of the second section can be reduced, thereby more effectively improving the sealing between the shell and the pole, improving the leakage problem, and improving the reliability of the battery cell.

[0032] 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.

[0033] 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 part and reducing the design and processing difficulty of the first extension part.

[0034] 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, the connecting hole 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.

[0035] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving groove and then flow toward the receiving cavity through the connecting hole, wherein the receiving groove can play the role of buffering the electrolyte to improve the problems of electrolyte splashing and overflow. Moreover, the side wall of the receiving groove can block the electrolyte splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell, there is no need to perform special processing on the shell, which is conducive to reducing the structural complexity and processing difficulty of the shell.

[0036] 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.

[0037] 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.

[0038] In some embodiments, the pole includes a pole cover plate that covers 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.

[0039] 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.

[0040] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell of any of the above-mentioned solutions.

[0041] 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.

[0042] 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.

[0043] 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

[0044] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. 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 related drawings can be obtained based on these drawings without paying creative work.

[0045] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0046] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0047] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0048] Figure 4 A schematic diagram of an orthographic projection of a battery cell provided in some embodiments of the present application;

[0049] Figure 5 For along Figure 4 Sectional view along line AA;

[0050] Figure 6 for Figure 5 A partial enlarged view of the B part circled in the middle;

[0051] Figure 7 for Figure 6 A partial enlarged view of the C section circled in the middle;

[0052] Figure 8 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0053] Fig. 9 A state diagram of a pole before riveting provided in some embodiments of the present application;

[0054] Fig.10 A state diagram of a pole after it is not riveted provided in some embodiments of the present application;

[0055] Fig.11 A schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0056] Reference numerals: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; box 101; first box body 1011; second box body 1012; battery cell 102; converging component 103; housing 1; accommodating cavity 11; mounting hole 12; central axis L; first shell wall 13; second shell wall 14; pole 2; pole body 3; sink 31; first extension portion 32; first section 321; first surface 3211; The third surface 3212; the second section 322; the second surface 3221; the fourth surface 3222; the penetration portion 33; the accommodating groove 36; the connecting hole 37; the second extension portion 38; the supporting portion 39; the pole cover 4; the liquid injection hole 43; the sealing structure 6; the first sealing member 61; the second sealing member 62; the battery cell assembly 7; the active material coating portion 71; the conductive portion 72; the insulating sealing structure 8; the first insulating sealing member 81; the second insulating sealing member 82; the first part 821; the second part 822. DETAILED DESCRIPTION

[0057] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0058] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. 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 and secondary relationship.

[0059] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0060] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0061] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0062] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0063] The term "plurality" used in the present application refers to two or more (including two).

[0064] In the present 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 the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0065] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. A battery module generally includes a plurality of battery cells. A battery pack generally includes a box for encapsulating one or more battery cells or one or more battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] The battery cell includes a shell, a battery cell assembly and an electrolyte. The shell is used to contain the battery cell assembly and the electrolyte. The battery cell assembly includes at least one electrode assembly, which is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrode assembly can be a wound structure or a stacked structure. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0067] The positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0068] The negative electrode sheet may generally include a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, and 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 a negative electrode tab. The material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon or silicon, etc.

[0069] In order to ensure that a large current can pass without melting, the number of positive pole ears is multiple and stacked together to form the positive pole ear portion, and the number of negative pole ears is multiple and stacked together to form the negative pole ear portion. A pole column is provided on the shell, and the positive pole ear portion is electrically connected to the positive pole column, and the negative pole ear portion is electrically connected to the negative pole column. For example, the pole ear portion can be connected to the pole column to form a direct electrical connection between the pole ear portion and the pole column. For another example, the battery cell assembly may include a transfer plate, the pole ear portion is connected to the transfer plate, and the transfer plate is connected to the pole column to form an indirect electrical connection between the pole ear portion and the pole column.

[0070] The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene.

[0071] In some battery cells in the related art, a pole is provided on the shell, and the pole is electrically connected to the battery cell assembly housed in the shell to realize the electrode output, and an insulating sealing structure is provided between the pole and the shell. Among them, the pole is passed through the shell and includes a stop edge that stops on both sides of the shell. The stop edge is prone to warping due to welding and other factors, and the closer the stop edge is to the edge, the greater the warping amplitude is, and the more difficult it is to press the insulating sealing structure, resulting in insufficient compression of the insulating sealing structure, affecting the sealing effect between the shell and the pole.

[0072] 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 being 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 portion and a second section portion sequentially arranged along a direction away from the central axis of the mounting hole, and the second section portion has a greater degree of compression on the insulating sealing structure than the first section portion.

[0073] Therefore, the second section is arranged to have a greater degree of compression on the insulating sealing structure than the first section. In this way, when the second section outside the first section is warped due to welding or the like, since the second section has a greater degree of compression on the insulating sealing structure than the first section, the problem of insufficient compression of the insulating sealing structure caused by the warping of the second section can be improved, thereby improving the sealing reliability between the pole and the shell and improving the reliability of the battery cell.

[0074] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, 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., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0075] 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.

[0076] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may 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 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and 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.

[0077] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve 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.

[0078] Please refer to Figure 2 , Figure 2 An exploded view of the structure of a battery 100 provided for some embodiments of the present application. The battery 100 includes a case 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the case 101. Among them, the case 101 is used to provide an assembly space for the battery cells 102, and the case 101 can adopt a variety of structures. In some embodiments, the case 101 may include a first case body 1011 and a second case body 1012, and the first case body 1011 and the second case body 1012 cover each other, and the first case body 1011 and the second case body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 may be a hollow structure with one end open, the first box body 1011 may be a plate-like structure, and 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 may 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 may be in various shapes, such as a cylinder, a cuboid, etc.

[0079] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 102 are connected in series and in parallel. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 102 is accommodated in the box 101; of course, the battery 100 can also be a battery module formed by multiple battery cells 102 connected in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 101. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component for realizing electrical welding between multiple battery cells 102.

[0080] Each battery cell 102 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 may be cylindrical, flat, or rectangular. Figure 3In the illustrated embodiment, the length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0081] In some embodiments of the present application, Figure 3-Figure 6 The battery cell 102 includes: a shell 1 and a pole 2, the pole 2 is arranged in the shell 1, and a receiving cavity 11 is formed inside the shell 1. Exemplarily, the battery cell 102 includes a battery cell assembly 7, and the battery cell assembly 7 may include an active material coating part 71 and a conductive part 72 connected to the active material coating part 71, the active material coating part 71 is received in the receiving cavity 11, and the conductive part 72 is welded to the pole 2, so that the conductive part 72 is electrically connected between the active material coating part 71 and the pole 2.

[0082] Combination Figure 5 and Figure 6 The shell 1 includes a first shell wall 13, and a mounting hole 12 is formed on the first shell wall 13. The pole 2 is penetrated in the mounting hole 12 to be mounted on the first shell wall 13. The pole 2 includes a penetration portion 33 and a first extension portion 32, wherein the penetration portion 33 is penetrated in the mounting hole 12, that is, at least part of the penetration portion 33 is located in the mounting hole 12, and the axial direction of the mounting hole 12 is taken as the projection direction, and the plane perpendicular to the axial direction of the mounting hole 12 is taken as the projection plane, and the projection of the penetration portion 33 on the projection plane falls within the projection range of the mounting hole 12 on the projection plane, so that the penetration portion 33 can be penetrated in the mounting hole 12. The type of the pole 2 is not limited, and it can be a cathode pole or an anode pole.

[0083] Combination Figure 5 and Figure 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 outer side of the outer surface or the inner side 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 respectively the outer surface and the inner surface, the inner surface is the side surface of the first shell wall 13 facing the accommodating cavity 11, the outer surface is the side surface of the first shell wall 13 away from the accommodating cavity 11, the side of the outer surface 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 that: at least a portion 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 portion of the first extension portion 32 corresponding to the intersection area is opposite to the first shell wall 13.

[0084] Combination Figure 5 and Figure 6 The battery cell 102 also includes an insulating sealing structure 8 that is 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.

[0085] Combination Figure 6 and Figure 7 The first extension portion 32 includes a first section 321 and a second section 322 which are sequentially arranged in 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 Figure 7 The portion on the right side of the auxiliary line M shown in FIG. 8 is the first segment 321 , and the portion on the left side of the auxiliary line M is the second segment 322 .

[0086] For example, in combination 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 portion 32, the first extension portion 32 is susceptible to warping due to the influence of welding, and the closer the first extension portion 32 is to the edge, the more serious the warping is. Alternatively, when the pole 2 is an integral part and is welded to a collector component 103 provided on the pole 2, the first extension portion 32 is susceptible to warping due to the influence of welding, and the closer the first extension portion 32 is to the edge, the more serious the warping is. When the edge of the first extension portion 32 is warped to a large extent, the edge of the first extension portion 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.

[0087] In order to improve the above technical problems, in an embodiment of the present application, the second section 322 is configured 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 welding or the like, 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.

[0088] It is worth mentioning that there are many ways to achieve "the second section 322 has 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 amount of compression 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.

[0089] In some embodiments, the compression amount of the second section 322 on the insulating sealing structure 8 is set to be greater than the compression amount of the first section 321 on the insulating sealing structure 8, that is, the compression amount of the second section 322 on the insulating sealing structure 8 is greater than that of the first section 321, so that the second section 322 can compress the insulating sealing structure 8 more tightly than the first section 321. Figure 6 and Figure 7 As shown, the insulating sealing structure 8 includes a first portion 821 arranged opposite to the first section 321 along the axial direction of the mounting hole 12, and a second portion 822 arranged opposite to the second section 322 along the axial direction of the mounting hole 12. When the compression amount of the second portion 822 is greater than the compression amount of the first portion 821, it can be understood that the compression amount of the insulating sealing structure 8 by the second section 322 is greater than that of the first section 321.

[0090] Among them, since the compression amount of the insulating sealing structure 8 by the second section 322 is larger than that of the first section 321, when the compression amount of the corresponding part of the insulating sealing structure 8 by the first section 321 (such as the first part 821) meets the requirements, the compression amount of the corresponding part of the insulating sealing structure 8 by the second section 322 (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 than 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 insulating sealing structure 8 by the tilted second section 322 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.

[0091] In some embodiments, the second section 322 protrudes relative to the first section 321 toward the direction close to the first shell wall 13, that is, the side surface of the second section 322 close to the first shell wall 13 (that is, the second surface 3221 of the second section 322) is arranged close to the first shell wall 13 relative to the side surface of the first section 321 close to the first shell wall 13 (that is, the first surface 3211 of the first section 321). Therefore, by protruding the second section 322 toward the direction close to the first shell wall 13, it is easy to achieve a large compression amount of the second section 322 on the insulating sealing structure 8 relative to the first section 321, so that a certain compression margin can be reserved, so that when the second section 322 is tilted, the compression loss caused by the tilting of the second section 322 can be offset by the compression margin, so that the compression amount 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.

[0092] 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. In this case, the insulating sealing structure 8 can be set to be, before assembly, a side surface of the second part 822 facing the second section 322 is set to be protruding relative to a side surface of the first part 821 facing the first section 321. After assembly, a side surface of the second part 822 facing the second section 322 is compressed to be flush with a side surface of the first part 821 facing the first section 321, thereby indicating that the second part 822 is more compressed relative to the first part 821. At this time, the second section 322 can also achieve a large compression amount 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 loss caused by the tilting of the second section 322 can be offset by the compression margin, 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.

[0093] In some embodiments, Figure 6 and Figure 7As shown, 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 direction close to the first shell wall 13, the second section 322 can be convex relative to the first section 321 toward the direction close to the first shell wall 13, so that it is easy to achieve a large compression amount of the second section 322 relative to the first section 321 on the insulating sealing structure 8, so as to reserve 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 shell 1 and the pole 2 caused by the warping of the second section 322. For another example, when the thickness increasing direction of the second section 322 is not limited, if the materials of the first section 321 and the second section 322 are consistent or have similar densities, 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 tighten 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.

[0094] In some embodiments, Figure 6 and Figure 7 As shown, the side surface of the first section 321 close to the first shell wall 13 (i.e., the first surface 3211 of the first section 321) is configured to extend 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. Thus, when the second section 322 protrudes relative to the first section 321 toward the direction close to the first shell wall 13, the problem of a large step formed at the connection between the side surface of the first section 321 close to the first shell wall 13 (i.e., the first surface 3211 of the first section 321) and 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) can be improved, and the cracking problem caused by large deformation can be improved, thereby improving the structural reliability of the first extension portion 32.

[0095] In some embodiments, Figure 6 and Figure 7 As shown, 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.

[0096] In some embodiments, Figure 6 and Figure 7As shown, when 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 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, so that on the one hand, the problem of cracking of the first extension portion 32 at the connection can be improved, and on the other hand, the problem of cracking of the insulating sealing structure 8 at the connection due to concentrated force can be improved, thereby playing the effect of protecting the insulating sealing structure 8.

[0097] In some embodiments, when the second section 322 protrudes relative to the first section 321 toward the direction close to the first shell wall 13, the second section 322 can be set to have a thickness W2 in the axial direction of the mounting hole 12 greater than a 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.

[0098] Therefore, by increasing the thickness of the second section 322 and limiting the thickening direction of the second section 322 to be toward the first shell wall 13, it is possible to achieve a greater compression amount of the second section 322 on 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.

[0099] For example, a 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 a 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 third surface 3212 and the fourth surface 3222 of the first extension portion 32 processed by riveting are 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 in the direction close to the first shell wall 13.

[0100] 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".

[0101] In some embodiments, Figure 6 and Figure 7 As shown, at least half of the extension dimension of the first extension portion 32 in the direction away from the central axis L of the mounting hole 12 is abutted against the first shell wall 13. The abutment means indirect contact through the insulating sealing structure 8. Specifically, 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 portion of the first extension portion 32 corresponding to the intersection area is abutted against the first shell wall 13.

[0102] For example Figure 7 As shown, the radial dimension of the portion of the first extension portion 32 corresponding to the intersection area in the mounting hole 12 is L3, and the radial dimension of the first extension portion 32 in the mounting hole 12 is L0, L3 ≥ L0 / 2 (as shown in FIG. Figure 7 It is worth noting that the shape of the mounting hole 12 is not limited, for example, it can be circular, rectangular, elliptical, racetrack-shaped, etc. For a non-circular mounting hole 12, the radial direction of the mounting hole 12 can include the width direction and the length direction of the mounting hole 12.

[0103] 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 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 sealing.

[0104] In some embodiments, Figure 6 and Figure 7As shown, the extension dimension of the portion where the first extension portion 32 abuts against the first shell wall 13 in the direction away from the central axis L of the mounting hole 12 is L3, and the wall thickness of the first shell wall 13 is D, wherein 0.5D≤L3≤2D. Thus, the dimension 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 dimension 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 sealing.

[0105] In some embodiments, Figure 6 and Figure 7 As shown, the extension dimension of the first section 321 in the direction away from the central axis L of the mounting hole 12 is L1, the extension dimension of the second section 322 in the direction away from the central axis L of the mounting hole 12 is L2, and the inclination amplitude of the first surface 3211 in the axial direction of the mounting hole 12 is H, wherein L2 is less than or equal to twice of H, that is, L2≤2H. As a result, the deformation of the surface of the first extension portion 32 facing the insulating sealing structure 8 is relatively slow, which can better restrain the cracking problem of the insulating sealing structure 8.

[0106] In some embodiments, Figure 6 and Figure 7 As shown, H≤L1 / 2, the inclination amplitude of the first surface 3211 can be not too large, and since the structural reliability of the first section 321 is good, the second section 322 and the penetration section 33 can be connected more reliably, and the pressing reliability of the first extension section 32 on the insulating sealing structure 8 is improved. Moreover, the inclination angle of the first surface 3211 is not too large, which can reduce the local pressure on the insulating sealing structure 8, so as to improve the cracking problem of the insulating sealing structure 8.

[0107] In some embodiments, Figure 6 and Figure 7 As shown, L1<L2, so that the size of the second section 322 is larger than that of the first section 321, so that the second section 322 is less likely to be lifted, and then the second section 322 can more easily press the insulating sealing structure 8 relative to the first section 321, which is conducive to increasing the degree of pressing of the second section 322 on the insulating sealing structure 8, so as to better improve the problem of insufficient pressing of the insulating sealing structure 8 caused by the lifting of the second section 322. Moreover, since the size of the second section 322 is larger than that of the first section 321, when the degree of pressing 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 to improve the cracking problem of the insulating sealing structure 8.

[0108] In some embodiments, Figure 6and Figure 7 As shown, the dimension of the first extension portion 32 in the radial direction of the mounting hole 12 is L0, and the thickness of the second section 322 in the axial direction of the mounting hole 12 is W2, L0≥1mm, W2≥0.5mm, for example, L0 is 1mm, 1.2mm, 1.4mm, 1.6mm, 1.8mm, 2mm, W2 is 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, etc. Thus, the first extension portion 32 can have a relatively large extension dimension to construct the second section 322, and the thickness dimension of the second section 322 is relatively large, and the second section 322 can be more effectively matched with the first shell wall 13 to more effectively compress the insulating sealing structure 8 and improve the reliability of the seal.

[0109] When the pole body 3 and the pole cover plate 4 are welded, after the weld solidifies and shrinks, the edge of the first extension part 32 is likely to be warped and deformed, resulting in a reduction in the compression of the outer ring of the insulating sealing structure 8, poor sealing, and easy leakage. In some embodiments of the present application, by defining the size and shape of the first extension part 32 as above, the first extension part 32 is formed into a shape that is elongated in the direction away from the central axis L of the mounting hole 12, and the edge is convex and thickened in the direction of the first shell wall 13, so that the compression of the edge of the first extension part 32 on the insulating sealing structure 8 can be increased, and a certain compression margin can be stored. When the edge of the first extension part 32 is warped due to the influence of welding, the compression margin can be used to compensate for the compression loss of the edge of the first extension part 32, so that the compression of the insulating sealing structure 8 is still sufficient, thereby solving the problem of poor sealing caused by insufficient compression of the sealing ring due to large warping of the edge of the first extension part 32 caused by the heat shrinkage of the weld solidification.

[0110] In some embodiments, Figure 6 and Figure 7 As shown, 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 shell wall 13 respectively, that is, when the first extension portion 32 extends to the outer side of the outer surface of the first shell wall 13, the second extension portion 38 extends to the inner side of the inner surface of the first shell wall 13, and when the first extension portion 32 extends to the inner side of the inner surface of the first shell wall 13, the second extension portion 38 extends to the outer side of the outer surface of the first shell 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 shell wall 13, and a second insulating seal 82 at least partially disposed between the second extension portion 38 and the first shell wall 13. The first insulating seal 81 and the second insulating seal 82 are two parts, and the material hardness of the first insulating seal 81 is greater than the material hardness of the second insulating seal 82.

[0111] In this way, the pressing force applied by the first extension portion 32 to the first insulating seal 81 can be better transmitted to the second insulating seal 82, so that the second insulating seal 82 can be better compressed, so that the compression amount of the first insulating seal 81 can be less than the compression amount of the second insulating seal 82, and the first insulating seal 81 and the second insulating seal 82 can both have a good sealing effect. In addition, 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 section 322 has a larger compression amount on the insulating sealing structure 8 relative to the first section 321, which can be understood as: the second section 322 has a larger compression amount on the second insulating seal 82 relative to the first section 321.

[0112] In some embodiments, Figure 6 and Figure 7 As shown, when the material hardness of the first insulating seal 81 is greater than the material hardness of the second insulating seal 82, the side surface of the first insulating seal 81 away from the first shell wall 13 is set to match the shape of the side surface of the first extension portion 32 facing the first shell wall 13, so that the contact area between the first insulating seal 81 and the first extension portion 32 can be increased, and the cracking problem of the first insulating seal 81 caused by local force concentration can be reduced. Moreover, when the second section 322 protrudes in the direction close to the first shell wall 13 relative to the first section 321, the first extension portion 32 and the first insulating seal 81 can form a concave-convex fit through shape matching, which plays a limiting role. It is beneficial to improve the movement and loosening of the first insulating seal 81 during the vibration and impact of the battery cell 102, so that the first insulating seal 81 will not be out of the sealing fit position, thereby improving the setting stability of the first insulating seal 81, so that the first insulating seal 81 can play a more reliable insulating sealing effect.

[0113] In some embodiments of the present application, Figure 6 and Figure 7 As shown, 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 is welded to the pole cover 4.

[0114] Therefore, by covering the pole cover 4 on the outside of the pole body 3, the pole cover 4 is arranged close to the first extension portion 32 relative to the second extension portion 38, and the heat generated by the welding of the pole cover 4 and the pole body 3 is more conducted 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.

[0115] In some embodiments of the present application, Figure 8 As shown, 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 with the penetration portion 33. The welding structure formed by welding is separated from the first extension portion 32.

[0116] Therefore, the shrinkage stress generated by the solidification of the molten pool formed by welding can be blocked by the above-mentioned interval, and is difficult or less transmitted to the first extension portion 32, so that the warping problem of the first extension portion 32 can be improved, so that the first extension portion 32 can press the insulating sealing structure 8, and improve the insulating sealing effect. In addition, since the edge of the pole cover plate 4 is arranged in the sink 31 and is penetrated and welded with the penetration portion 33, rather than being butt-welded with the first extension portion 32, it is not necessary to ensure that the assembly gap between the edge of the pole cover plate 4 and the first extension portion 32 is small in order to meet the butt welding requirements, so that the interval 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, which is conducive to reducing the processing accuracy of the pole cover plate 4 and the pole body 3.

[0117] In some embodiments of the present application, Fig. 9 and Fig.10 As shown, the pole 2 is formed into a first extension portion 32 by riveting with flanges, for example Fig. 9 The figure shows the state of the pole 2 before riveting. Fig.10 The state after the pole 2 is riveted. Specifically, after the pole 2 is assembled to the mounting hole 12 through the penetration portion 33, the first extension portion 32 is manufactured by the flanging riveting process. As a result, the pole 2 is easy to process, and is conducive to improving the connection reliability between the first extension portion 32 and the penetration portion 33, and improving the assembly reliability of the pole 2 and the first shell wall 13.

[0118] For example, before the first extension portion 32 is riveted, the first extension portion 32 can be set to a structure in which the outer surface of the outer end is relatively protruding. After the first extension portion 32 is riveted by flanging, the third surface 3212 of the first section 321 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, while 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.

[0119] 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 respectively assembled to the mounting holes 12, and then the two parts are welded together. It is understandable that when the pole 2 is assembled to the first shell wall 13 by other means other than riveting, the insulating sealing structure 8 may also be squeezed.

[0120] 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 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. Among them, since the mass per unit area of ​​the second section 322 is greater than that of the first section 321, the difficulty of the second section 322 to tilt compared with the first section 321 can be increased, so as to present the effect that the second section 322 has a greater degree of compression on the insulating sealing structure 8 relative to the first section 321. In this way, the tilting amplitude of the second section 322 can be reduced to a certain extent, and the problem of poor sealing between the pole 2 and the shell 1 caused by the large tilting amplitude of the second section 322, which leads to the inability to compress the insulating sealing structure 8, can be improved, 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.

[0121] It is worth noting that when the mass per unit area of ​​the second section 322 is large relative to the mass per unit area of ​​the first section 321, the compression amount of the second section 322 on the insulating sealing structure 8 relative to the first section 321 may not be large. When the compression amount of the second section 322 on the insulating sealing structure 8 is large relative to the first section 321, and the mass per unit area of ​​the second section 322 is large relative to the mass per unit area of ​​the first section 321, the degree of compression of the second section 322 on the insulating sealing structure 8 relative to the first section 321 can be more effectively achieved. Therefore, by setting the mass per unit area of ​​the second section 322 to be large relative to the mass per unit area of ​​the first section 321, it is easy to achieve a large compression amount of the second section 322 on the insulating sealing structure 8 relative to the first section 321, so that not only can the compression margin be used to compensate for the compression loss caused by the warping of the second section 322, but also the warping amplitude of the second section 322 can be reduced, so that the sealing between the shell 1 and the pole 2 can be more effectively improved, the leakage problem can be improved, and the reliability of the battery cell 102 can be improved.

[0122] 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 is the dimension along the axial direction of the mounting hole 12, and when the thickness is not a constant value, the thickness refers to the average thickness.

[0123] 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 mass of the second section 322 per unit area is larger than that of the first section 321, thereby reducing the structural complexity of the first extension portion 32 and reducing the difficulty of designing and processing the first extension portion 32.

[0124] 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.

[0125] 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 in a direction close to the first shell wall 13. Thus, by protruding in a direction close to 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 corresponding position of the insulating sealing structure 8 by the second section 322, 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 that the insulating sealing structure 8 cannot be pressed due to the large tilting amplitude of the second section 322, resulting in poor sealing between the pole 2 and the shell 1.

[0126] In some embodiments of the present application, Figure 5 and Figure 6 As shown, the battery cell 102 is formed with a receiving cavity 11 on the inner side of the first shell wall 13, and the pole 2 includes a pole body 3, on which is formed a receiving groove 36 which is open in a direction away from the receiving cavity 11, and on which is a connecting hole 37, which penetrates through a groove wall of the receiving groove 36 which is close to the receiving cavity 11, and connects the receiving cavity 11 with the receiving groove 36. For example, when the penetration portion 33 is annular, the receiving groove 36 is located in the inner ring region of the penetration portion 33, and for example, the receiving groove 36 can be defined by the penetration portion 33 and a supporting portion 39 located in the inner ring region of the penetration portion 33.

[0127] Thus, when injecting electrolyte 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 and overflow. Moreover, the side wall of the receiving groove 36 (i.e., 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.

[0128] In some embodiments of the present application, Figure 5 and Figure 6As shown, the battery cell 102 includes a cell assembly 7, and the cell assembly 7 includes an active material coating portion 71 received in the receiving chamber 11, and a conductive portion 72 connected to the active material coating portion 71, and the conductive portion 72 is penetrated in the connecting hole 37 to be at least partially received in the receiving groove 36. It is worth noting that the connecting hole 37 can be one or more, and the conductive portion 72 can be penetrated in at least one of the connecting holes 37. Exemplarily, at least one connecting hole 37 can pass electrolyte, for example, at least one connecting hole 37 is vacant (that is, the conductive portion 72 is not penetrated), so that the electrolyte can pass through without being hindered by the conductive portion 72, and for another example, at least one connecting hole 37 can still pass electrolyte after the conductive portion 72 is penetrated.

[0129] 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, which is beneficial to improving the energy density of the battery cell 102, or when the energy density of the battery cell 102 remains unchanged, it is beneficial to reduce the size of the battery cell 102.

[0130] 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 a pole ear portion, or may include a pole ear portion and a transition piece electrically connected to the pole ear portion, etc., which is not limited here.

[0131] In some embodiments, the conductive portion 72 is welded to the pole body 3 to form an electrical connection, thereby realizing the output of the battery cell assembly 7 from the electrode at the pole body 3. Figure 6 As shown, 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 of the two. Of course, the present application is not limited thereto, and in other embodiments, the conductive portion 72 may also be configured to be welded to the pole cover plate 4 to form an electrical connection, which is not limited here.

[0132] In some embodiments of the present application, Figure 5 and Figure 6 As shown, the pole 2 includes a pole cover plate 4 covering the pole body 3 , and a liquid injection hole 43 which can be communicated with the receiving groove 36 is formed on the pole cover plate 4 . The battery cell 102 also includes a sealing structure 6 for sealing the liquid injection hole 43 .

[0133] In this way, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43 first, or the sealing structure 6 is in a state of opening the injection hole 43, and the electrolyte can be injected into the receiving groove 36 through the injection hole 43. After the injection, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a state of closing the injection hole 43, so as to seal and close the injection hole 43 to prevent the electrolyte from overflowing and prevent foreign matter from entering the receiving cavity 11 from the injection hole 43, thereby improving the reliability of the battery cell 102.

[0134] 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 flexible and diversified design of the sealing structure 6.

[0135] In some embodiments, Figure 6 As shown, the pole cover plate 4 does not have a portion that stops at 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 to 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 to the pole cover plate 4 from the outside of the pole cover plate 4 to seal the injection hole 43, the sealing structure 6 is installed after the injection, which can ensure the sealing of the injection hole 43, and the installation position is close to the outside, which is convenient for the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 will not have an adverse effect on the connection between the pole body 3 and the pole cover plate 4, ensuring the reliability of the connection between the pole cover plate 4 and the pole body 3.

[0136] The sealing structure 6 can be in a detachable form or in a non-detachable fixed form. For example, when the sealing structure 6 is in a detachable form, it is convenient for maintaining the injection hole 43. For example, when electrolyte needs to be replenished, the sealing structure 6 can be removed, the injection hole 43 can be opened, and electrolyte can be replenished and injected into the accommodating cavity 11 through the injection hole 43, and then the sealing structure 6 can be reinstalled. For example, the sealing structure 6 can be detachably connected to the pole cover plate 4 by means of threads or screws, so as to facilitate disassembly and assembly.

[0137] 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-section 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.

[0138] Alternatively, in some embodiments, the second sealing member 62 may be configured to be detachably connected to the pole cover plate 4 by means of a screw-on, so as to restrict the first sealing member 61 to a position where it is interference-fitted with the injection hole 43 .

[0139] In some embodiments of the present application, Figure 6 As shown, at least part of the sealing structure 6 is embedded in the injection hole 43. That is, the sealing structure 6 can be fully embedded in the injection hole 43, or only part of the sealing structure 6 can be embedded in the injection hole 43. Thus, on the one hand, the space in the injection hole 43 can be fully utilized to improve the sealing reliability of the sealing structure 6 to the injection hole 43, and on the other hand, the height of the sealing structure 6 protruding outside the injection hole 43 can be reduced, and the space occupied by the sealing structure 6 outside the pole cover 4 can be reduced, which is conducive to reducing the interference effect on the converging component 103, increasing the connection area between the converging component 103 and the pole cover 4, and improving the flow efficiency.

[0140] In some embodiments of the present application, the first shell wall 13 is an integrally formed cover plate, or, as Figure 5 As shown, the housing 1 also includes a second housing wall 14, the first housing wall 13 and at least one second housing wall 14 are integrally formed, and the second housing wall 14 extends toward one side in the thickness direction of the first housing wall 13. Thus, the structural position of the pole 2 can be flexibly designed, thereby increasing the applicable scope of the battery cell 102 of the embodiment of the present application.

[0141] It is worth noting that the second shell wall 14 can extend from the edge of the first shell wall 13. When the first shell wall 13 is rectangular, at least one of the four edges of the first shell wall 13 can extend the second shell wall 14. For example, only one edge of the first shell wall 13 extends from the second shell wall 14. The first shell wall 13 can also have only two edges that extend from the second shell wall 14 respectively. The first shell wall 13 can also have three edges that extend from the second shell wall 14 respectively. The first shell wall 13 can also have four edges that extend from the second shell wall 14. Exemplarily, when the shell 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 13.

[0142] 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.

[0143] According to the second aspect of the present application, the present application also provides a battery 100, including a battery cell 102 of any of the above solutions. It is worth noting that the battery 100 according to the embodiment of the present application may include a box body or may not include a box body. Therefore, since the reliability of the battery cell 102 according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery 100.

[0144] For example, Fig.11 As shown, the battery 100 may further include a busbar 103, and there are multiple battery cells 102, and at least two of them are electrically connected through the busbar 103. In this way, multiple battery cells 102 can be connected in series and / or in parallel. For example, when multiple battery cells 102 are connected in series, the pole cover plate 4 of the anode of one battery cell 102 is connected to the pole cover plate 4 of the cathode of the next battery cell 102 through a busbar 103, and at the same time, the pole cover plate 4 of the cathode of the battery cell 102 is connected to the pole cover plate 4 of the anode of the previous battery cell 102 through another busbar 103.

[0145] According to the third aspect of the present application, the present application also provides an electric device, including the battery 100 of any of the above solutions, and the battery 100 is used to provide power to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, it is beneficial to improve the working power performance of the electric device.

[0146] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0147] The battery cell 102 includes a shell 1, a pole 2 and an insulating sealing structure 8. The shell 1 includes a first shell wall 13, which has a mounting hole 12. The pole 2 includes a pole body 3 and a pole cover 4. The pole cover 4 is covered on the outside of the pole body 3. The pole body 3 includes a penetration portion 33 penetrated through the mounting hole 12, and 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 shell wall 13, and the second extension portion 38 extends to the inside of the inner surface of the first shell wall 13. The pole 2 forms the first extension portion 32 by flanging riveting.

[0148] The first extension portion 32 includes a first section 321 and a second section 322 which are sequentially arranged along a direction away from the central axis L of the mounting hole 12, wherein 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, wherein the first surface 3211 extends obliquely along a direction away from the central axis L of the mounting hole 12 toward a direction close to the first shell wall 13, the second surface 3221 is parallel to the first shell wall 13, and the first surface 3211 is linearly connected to the second surface 3221 so that the second surface 3221 protrudes relative to the first surface 3211 toward a 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 direction close to the first shell wall 13 .

[0149] 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 fitted 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 fitted between the second pole portion and the first shell wall 13, and the second insulating seal 82 is separately arranged from the first insulating seal 81. The first insulating seal 81 is a plastic part, and the second insulating seal 82 is a rubber part. The material hardness of the first insulating seal 81 is greater than the material hardness of the second insulating seal 82. The side surface of the first insulating seal 81 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 arranged opposite to the first section 321 along the axial direction of the mounting hole 12, and a second portion 822 arranged opposite to the second section 322 along the axial direction of the mounting hole 12.

[0150] During assembly, the first insulating seal 81, the second insulating seal 82 and the pole body 3 can be first installed at the mounting hole 12 of the first shell wall 13, and then the first extension portion 32 can be processed by riveting. At this time, the first extension portion 32 will apply a force to the first insulating seal 81, and the first insulating seal 81 will apply 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 part 822 is greater than the compression amount of the first part 821.

[0151] Thus, the insulating sealing structure 8 can reserve a certain compression margin at the position corresponding to the second section 322. When the pole cover plate 4 and the pole body 3 are welded and deformed to shrink and deform, causing the second section 322 to tilt up, since the position of the insulating sealing structure 8 corresponding to the second section 322 has a compression margin, the compression margin can be used to compensate for the compression loss caused by the tilting of the second section 322, so that the compression of the insulating sealing structure 8 at the corresponding second section 322 is still sufficient, thereby improving the reliability of the seal and solving the problem of leakage caused by sealing failure due to excessive compression loss. In addition, since the side surface of the first insulating seal 81 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 problem of the first insulating seal 81 loosening under vibration and impact environment, and improve the setting stability of the first insulating seal 81 and the reliability of the insulating seal.

[0152] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0153] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The invention comprises a battery cell according to any one of claims 1 to 18.

20. An electrical device, characterized in that: Comprising a battery according to claim 19.

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