Battery cell, battery and electric device

Abstract

A battery cell, a battery and an electric device, which belongs to the technical field of batteries. The battery cell comprises: a first shell wall, a terminal and an insulating and sealing structure, wherein the terminal comprises a passing portion and a first extending portion; the first extending portion extends to the outside of an outer surface or the inside of an inner surface of the first shell wall; a first corner arranged towards the first shell wall is provided at the connection between the first extending portion and the passing portion; the first shell wall comprises a second corner corresponding to the first corner; the insulating and sealing structure is fitted between the first shell wall and the terminal, and comprises a third corner corresponding to the first corner and a fourth corner corresponding to the second corner; and at least one of the first corner, the second corner, the third corner and the fourth corner is formed as a chamfer.

Description

Battery cells, batteries and electrical devices

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application is based on the Chinese patent application with application number 202311203297.7 and application date 2023-09-18, and claims the priority of the above-mentioned Chinese patent application. The entire content of the above-mentioned Chinese patent application is hereby introduced into this application as a reference. Technical Field

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

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

[0005] Summary of the Invention

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

[0007] In the first aspect, an embodiment of the present application provides a battery cell, comprising a first shell wall, a pole and an insulating sealing structure, wherein the first shell wall has a mounting hole, the pole comprises a penetration portion penetrated in the mounting hole, and a first extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the first extension portion extends to the outside of the outer surface or the inside of the inner surface of the first shell wall, the connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, the first shell wall includes a second corner set corresponding to the first corner, the insulating sealing structure is fitted between the first shell wall and the pole, and includes a third corner set corresponding to the first corner, and a fourth corner set corresponding to the second corner, at least one of the first corner, the second corner, the third corner and the fourth corner is formed as a chamfer.

[0008] In the above technical solution, when the pole is installed on the first shell wall, the pole will apply a force to the insulating sealing structure, so that the insulating sealing structure squeezes the first shell wall, and the first shell wall will apply a reaction force to the pole. The position of the insulating sealing structure corresponding to the first corner and / or the second corner is subjected to relatively large force, which is a weak position prone to cracking. By setting at least one of the first corner, the second corner, the third corner and the fourth corner to be chamfered, the force-bearing or force-applying area can be increased, the force acting on the weak position can be dispersed, and the problem of force concentration at the weak position can be improved, thereby reducing the risk of cracking of the insulating sealing structure at the weak position, which is beneficial to improving the reliability of the insulating seal fit between the first shell wall and the pole, and improving the reliability of the battery cell.

[0009] In some embodiments, at least one of the first corner and the third corner is formed as a chamfer.

[0010] In the above technical solution, when the pole is assembled and fixed to the first housing wall, the first corner easily squeezes the third corner, causing the insulating seal structure to crack at the third corner. If the first corner is configured as a chamfer, the area where the first corner applies force to the third corner can be increased, dispersing the force application location, thereby reducing the concentrated force squeezing the third corner location and reducing the risk of the insulating seal structure cracking at the third corner. If the third corner is configured as a chamfer, the force application area of ​​the third corner can be increased when the first corner applies force to the third corner, dispersing the force at the third corner location, thereby reducing the risk of the insulating seal structure cracking at the third corner. Therefore, by forming at least one of the first and third corners as a chamfer, the risk of the insulating seal structure cracking at the third corner can be reduced.

[0011] In some embodiments, the first corner and the third corner are both formed as chamfers and the types of the chamfers are the same.

[0012] In the above technical solution, when the first corner and the third corner are in contact, it is beneficial to achieve surface contact between the first corner and the third corner, thereby dispersing the force on the third corner and improving the cracking problem of the third corner. When the first corner and the third corner are gap-fitted, it is beneficial to improve the uniformity of the gap between the first corner and the third corner, thereby helping to reduce the extrusion of the first corner on the third corner and improve the cracking problem of the third corner.

[0013] In some embodiments, the first corner and the third corner are both formed as rounded corners, and the rounded corner radius of the third corner is larger than the rounded corner radius of the first corner.

[0014] In the above technical solution, the first corner is processed into a chamfered shape, which is conducive to reducing the difficulty of processing the pole. For example, when the first extension portion is processed by riveting, it is easy to directly form the first corner with a chamfered shape. The third corner is also processed into a chamfered shape, and the chamfer radius of the third corner is set to be larger than the chamfer radius of the first corner, which is conducive to increasing the fitting clearance between the first corner and the third corner, reducing the extrusion of the first corner on the third corner, and thus reducing the risk of cracking of the insulating sealing structure from the position of the third corner. In addition, processing the third corner into a chamfered shape is conducive to reducing the problem of cracking of the insulating sealing structure from the third corner during processing, which is conducive to demolding, etc.

[0015] In some embodiments, a fitting gap is provided between the first corner and the third corner.

[0016] In the above technical solution, the extrusion of the first corner on the third corner can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure cracking at the position of the third corner.

[0017] In some embodiments, at least one of the second corner and the fourth corner is formed as a chamfer.

[0018] In the above technical solution, when the pole is assembled and fixed to the second shell wall, the second corner easily squeezes the fourth corner, causing the insulating sealing structure to crack at the fourth corner. If the second corner is set as a chamfer, the area where the second corner applies force to the fourth corner can be increased, so that the force application position is dispersed, thereby reducing the concentrated force squeezing the position of the fourth corner, thereby reducing the risk of the insulating sealing structure cracking at the fourth corner. If the fourth corner is set as a chamfer, when the second corner applies force to the fourth corner, the force area of ​​the fourth corner can be increased, so that the force at the fourth corner is dispersed, thereby reducing the risk of the insulating sealing structure cracking at the fourth corner. Therefore, by forming at least one of the second corner and the fourth corner into a chamfer, the risk of the insulating sealing structure cracking at the fourth corner can be reduced.

[0019] In some embodiments, the second corner and the fourth corner are both formed as chamfers and the types of the chamfers are the same.

[0020] In the above technical solution, when the second corner and the fourth corner are in contact, it is beneficial to achieve surface contact between the second corner and the fourth corner, thereby dispersing the force on the fourth corner and improving the cracking problem of the fourth corner. When the second corner and the fourth corner are gap-fitted, it is beneficial to improve the uniformity of the gap between the second corner and the fourth corner, thereby helping to reduce the extrusion of the second corner on the fourth corner and improve the cracking problem of the fourth corner.

[0021] In some embodiments, a fitting gap is provided between the second corner and the fourth corner.

[0022] In the above technical solution, the extrusion of the second corner on the fourth corner can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure cracking at the position of the fourth corner.

[0023] In some embodiments, the third corner and the fourth corner are both formed as chamfered corners, and the third corner is formed as a rounded corner, and the fourth corner is formed as a chamfered corner.

[0024] In the above technical solution, chamfers are provided at the third and fourth corners of the insulating seal structure to alleviate the cracking problem at the third and fourth corners, thereby more comprehensively protecting the insulating seal structure. Furthermore, the requirements for whether the first and second corners are processed as chamfers are reduced, thereby reducing the difficulty of machining the first shell wall and the pole. Furthermore, the third corner is rounded and the fourth corner is chamfered, which ensures that the wall thickness of the insulating seal structure between the third and fourth corners is sufficient, thereby improving the local structural strength of the insulating seal structure, further improving the cracking problem, and enhancing the reliability of the insulating seal.

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

[0026] In the above technical solution, the penetration portion is not easily squeezed directly onto the insulating sealing structure, thereby reducing the force transmitted to the insulating sealing structure, reducing damage to the insulating sealing structure, and protecting the insulating sealing structure.

[0027] In some embodiments, the first extension portion of the pole is formed by riveting.

[0028] In the above technical solution, the pole is easy to process, and is conducive to improving the connection reliability between the first extension portion and the penetration portion, and improving the assembly reliability between the pole and the first shell wall.

[0029] In some embodiments, the insulating sealing structure includes a first portion and a second portion integrated into one piece, the material hardness of the first portion is less than the material hardness of the second portion, and the first portion defines the third corner and / or the fourth corner.

[0030] In the above technical solution, when the pole is assembled and fixed to the first shell wall, the pole will squeeze the insulating sealing structure. The insulating sealing structure is provided with a first part at at least one corner. The first part is easily compressed and deformed relative to the second part under force, and absorbs the force, thereby reducing the risk of cracking of the insulating sealing structure.

[0031] In some embodiments, the insulating sealing structure includes a first insulating seal defining a third corner and a fourth corner, wherein a first gasket is provided between the first insulating seal and the first extension portion, and / or a second gasket is provided between the first insulating seal and a side surface of the first shell wall facing the first extension portion, and the material hardness of the second gasket is less than the material hardness of the first insulating seal.

[0032] In the above technical solution, when the pole is installed in the first housing wall, when the first extension compresses the first insulating seal toward the first housing wall, the first gasket provided between the first insulating seal and the first extension can reduce a portion of the force, thereby reducing the force transmitted to the first insulating seal, thereby reducing damage to the first insulating seal and protecting the first insulating seal. When the pole is installed in the first housing wall, when the pole compresses the first insulating seal toward the first housing wall, the first insulating seal can transmit the force to the second gasket. Since the material hardness of the second gasket is relatively low, it can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the first insulating seal, reducing damage to the first insulating seal and protecting the first insulating seal.

[0033] In some embodiments, the pole also includes a second extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the second extension portion and the first extension portion extend to the inner and outer sides of the first shell wall respectively, the penetration portion and the first extension portion constitute a first pole portion, and the penetration portion and the second extension portion constitute a second pole portion, the insulating sealing structure includes a first insulating seal fitted between the first pole portion and the first shell wall, and a second insulating seal fitted between the second pole portion and the first shell wall, and the second insulating seal and the first insulating seal are separately arranged.

[0034] In the above technical solution, since the pole includes the first extension portion and the second extension portion disposed on the inner and outer sides of the first shell wall, the cooperation between the pole and the first shell wall can be more stable and secure. Moreover, since the insulating sealing structure includes the first insulating seal and the second insulating seal disposed separately, the first insulating seal and the second insulating seal can be installed separately, thereby reducing the difficulty of assembly and ensuring the insulating sealing cooperation effect between the pole and the first shell wall at all locations.

[0035] In some embodiments, the pole includes a pole body and a pole cover, the pole body includes a first pole portion and a second pole portion, the first extension portion extends to the outside of the outer surface of the first shell wall, the pole cover is arranged on the side of the first pole portion away from the second pole portion, and the pole body is welded to the pole cover, and the material hardness of the second insulating seal is less than the material hardness of the first insulating seal.

[0036] In the above technical solution, the material hardness of the first insulating seal is greater than that of the second insulating seal. The second insulating seal is more easily compressed and deformed than the first insulating seal and has a better sealing effect. However, the heat resistance of the first insulating seal is stronger than that of the second insulating seal. For example, the first insulating seal is a plastic part and the second insulating seal is a rubber part. Therefore, when the pole body and the pole cover are welded, the thermal impact on the second insulating seal can be minimized, thereby improving the sealing reliability between the first shell wall and the pole.

[0037] In some embodiments, the first extension portion protrudes from the penetration portion toward the outside of the first shell wall to define a recessed groove between the first extension portion and the penetration portion. The edge of the pole cover plate is arranged in the recessed groove and is penetrated and welded to the penetration portion. The welding structure formed by the welding is separated from the first extension portion.

[0038] In the above technical solution, the shrinkage stress generated by the solidification of the molten pool formed by the welding can be blocked by the above-mentioned gap, making it difficult or less likely to be transmitted to the first extension. This can improve the warping problem of the first extension, allowing the first extension to compress the insulating sealing structure and improve the insulating sealing effect. Moreover, because the edge of the pole cover is disposed in the recessed groove and is through-welded to the penetration portion, rather than butt-welded to the first extension, there is no need to ensure a small assembly gap between the edge of the pole cover and the first extension to meet the requirements of butt welding. The gap between the edge of the pole cover and the first extension can be larger, thereby improving the compatibility of the pole body and facilitating the reduction of the processing accuracy of the pole cover and the pole body.

[0039] In some embodiments, the battery cell forms a accommodating cavity on the inner side of the first shell wall, the pole includes a pole body, a accommodating groove open in a direction away from the accommodating cavity is formed on the pole body, and a connecting hole is provided on the pole body, which passes through the groove wall on one side of the accommodating groove close to the accommodating cavity and connects the accommodating cavity with the accommodating groove.

[0040] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving tank and then flow toward the receiving cavity through the connecting hole. The receiving tank can serve as a buffer for the electrolyte to improve the problem of electrolyte splashing and overflow. In addition, the side walls of the receiving tank can block electrolyte splashing to a certain extent, reducing external contamination caused by the electrolyte and facilitating rapid injection. Moreover, since there is no need to open a separate injection channel on the shell, there is no need for special processing of the shell, which helps to reduce the structural complexity and processing difficulty of the shell.

[0041] 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.

[0042] 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.

[0043] In some embodiments, the pole includes a pole cover plate covering the pole body, a liquid injection hole that can be communicated with the receiving groove is formed on the pole cover plate, and the battery cell also includes a sealing structure for sealing the liquid injection hole.

[0044] 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.

[0045] In a second aspect, an embodiment of the present application further provides a battery comprising a battery cell according to any of the above solutions.

[0046] 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.

[0047] 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.

[0048] 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

[0049] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0050] FIG1 is a schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0051] FIG2 is an exploded view of the structure of a battery provided in some embodiments of the present application;

[0052] FIG3 is a schematic structural diagram of a battery cell provided in some embodiments of the present application;

[0053] FIG4 is a schematic orthographic projection diagram of a battery cell provided in some embodiments of the present application;

[0054] FIG5 is a cross-sectional view along line AA in FIG4 ;

[0055] FIG6 is a partial enlarged view of the circled portion B in FIG5 ;

[0056] FIG7 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0057] FIG8 is a partial enlarged view of the circled portion C in FIG7 ;

[0058] FIG9 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0059] FIG10 is a schematic structural diagram of an insulating sealing structure provided in some embodiments of the present application;

[0060] FIG11 is a schematic structural diagram of an insulating sealing structure provided in other embodiments of the present application;

[0061] FIG12 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0062] FIG13 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0063] FIG14 is a partial cross-sectional view of a battery cell provided in some embodiments of the present application;

[0064] FIG15 is a schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0065] Reference numerals: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; housing 101; first housing body 1011; second housing body 1012; battery cell 102; current collecting component 103; housing 1; accommodating chamber 11; mounting hole 12; central axis L; first housing wall 13; second corner 131; second housing wall 14; pole 2; pole body 3; recess 31; first extension portion 32; penetration portion 33; first corner 34; first pole portion 35; Receiving groove 36; connecting hole 37; second extension portion 38; second pole portion 39; pole cover 4; injection hole 43; sealing structure 6; first sealing member 61; second sealing member 62; battery cell assembly 7; active material coating portion 71; conductive portion 72; insulating sealing structure 8; third corner 81; fourth corner 82; first part 83; first sub-portion 831; second sub-portion 832; second part 84; first insulating seal 85; second insulating seal 86; third insulating seal 87; first gasket 91; second gasket 92. DETAILED DESCRIPTION

[0066] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0068] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0070] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0071] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0072] The term "plurality" used in this application refers to two or more (including two).

[0073] In this application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries, or magnesium-ion batteries, etc., and the embodiments of this application do not limit this. Battery cells may be cylindrical, flat, rectangular, or other shapes, etc., and the embodiments of this application do not limit this. Battery cells are generally divided into three types based on the packaging method: cylindrical battery cells, prismatic battery cells, and soft-pack battery cells, and the embodiments of this application do not limit this.

[0074] The battery referred to in the embodiments of this application refers to a single physical module that includes one or more battery cells to provide higher voltage and capacity. For example, the battery referred to in this application may include a battery module or a battery pack. A battery module generally includes multiple battery cells. A battery pack generally includes a casing for enclosing one or more battery cells or one or more battery modules. The casing prevents liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0075] A battery cell consists of a housing, a cell assembly, and an electrolyte. The housing holds the cell assembly and electrolyte. The cell assembly includes at least one electrode assembly, which consists of a positive electrode sheet, a negative electrode sheet, and a separator. The electrode assembly can be a wound or stacked structure. A battery cell primarily operates by the movement of metal ions between the positive and negative electrode sheets.

[0076] A positive electrode sheet generally includes a positive current collector and a positive active material layer. The positive active material layer is directly or indirectly coated on the positive current collector. The uncoated positive current collector protrudes from the coated positive current collector, serving as the positive tab. For lithium-ion batteries, for example, the positive current collector can be made of aluminum, and the positive active material layer can be made of lithium cobalt oxide, lithium iron phosphate, ternary lithium, or lithium manganese oxide.

[0077] A negative electrode sheet generally includes a negative electrode current collector and a negative electrode active material layer. The negative electrode active material layer is directly or indirectly coated on the negative electrode current collector. The negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as the negative electrode tab. The negative electrode current collector can be made of copper, and the negative electrode active material layer can be made of carbon, silicon, or other materials.

[0078] To ensure that high currents can pass without melting, the positive electrode tabs are multiple and stacked together to form the positive electrode tab portion, and the negative electrode tabs are multiple and stacked together to form the negative electrode tab portion. The housing is provided with a pole post, and the positive electrode tab portion is electrically connected to the positive electrode post, and the negative electrode tab portion is electrically connected to the negative electrode post. For example, the tab portion can be connected to the pole post to form a direct electrical connection between the tab portion and the pole post. For another example, the battery cell assembly can include an adapter plate, the tab portion is connected to the adapter plate, and the adapter plate is connected to the pole post to form an indirect electrical connection between the tab portion and the pole post.

[0079] The material of the isolation film is not limited, and can be, for example, polypropylene or polyethylene.

[0080] In some battery cells in the related art, the poles are installed on the shell by riveting. In order to achieve insulation sealing between the shell and the poles, insulating plastic is usually provided between the poles and the shell before riveting the poles. However, when the poles are riveted, the poles will be deformed by force and squeeze the insulating plastic. The weak parts of the insulating plastic are easily cracked by force. Once the insulating plastic cracks, it will affect the reliability of the insulation seal between the shell and the poles, resulting in a decrease in the reliability of the battery cell.

[0081] To this end, an embodiment of the present application proposes a battery cell, comprising: a shell, a pole and an insulating sealing structure, the shell comprising a first shell wall having a mounting hole, the pole comprising a penetration portion 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 of the first shell wall or the inside of the inner surface, the connection between the first extension portion and the penetration portion has a first corner set toward the first shell wall, the first shell wall includes a second corner set corresponding to the first corner, the insulating sealing structure is fitted between the first shell wall and the pole, and includes a third corner set corresponding to the first corner, and a fourth corner set corresponding to the second corner, at least one of the first corner, the second corner, the third corner and the fourth corner is formed as a chamfer.

[0082] Therefore, when the pole is installed on the first shell wall, the pole will apply a force to the insulating sealing structure, and the first shell wall will apply a reaction force to the insulating sealing structure. The position of the insulating sealing structure corresponding to the first corner and / or the second corner is subjected to relatively large force, which is a weak position and is prone to cracking. By setting at least one of the first corner, the second corner, the third corner and the fourth corner to be chamfered, the force-bearing or force-applying area can be increased, the force acting on the weak position can be dispersed, and the problem of force concentration at the weak position can be improved, thereby reducing the risk of cracking of the insulating sealing structure at the weak position, which is beneficial to improving the reliability of the insulating seal fit between the first shell wall and the pole, and improving the reliability of the battery cell.

[0083] The present invention provides an electric device that uses a battery as a power source. The electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery-powered vehicle, an electric car, a ship, a spacecraft, etc. The electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0084] 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.

[0085] Please refer to Figure 1, which is a schematic structural diagram of a vehicle 1000 provided in some embodiments of the present application. The vehicle 1000 can be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 can be provided at the bottom, head or tail of the vehicle 1000. The battery 100 can be used to power the vehicle 1000. For example, the battery 100 can serve as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300. The controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0086] In some embodiments of the present application, the battery 100 can serve not only as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0087] Please refer to Figure 2, which is an exploded view of the structure of the battery 100 provided in some embodiments of the present application. The battery 100 includes a box body 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the box body 101. The box body 101 is used to provide an assembly space for the battery cells 102, and the box body 101 can adopt a variety of structures. In some embodiments, the box body 101 may include a first box body 1011 and a second box body 1012, and the first box body 1011 and the second box body 1012 cover each other, and the first box body 1011 and the second box body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 can be a hollow structure with one end open, and the first box body 1011 can be a plate-like structure. The first box body 1011 covers the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define an assembly space. The first box body 1011 and the second box body 1012 can also be hollow structures with one side open, and the open side of the first box body 1011 covers the open side of the second box body 1012. Of course, the box body 101 formed by the first box body 1011 and the second box body 1012 can be of various shapes, such as a cylinder, a cuboid, etc.

[0088] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid configuration. A hybrid configuration refers to a combination of series and parallel connections within the multiple battery cells 102. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid configuration, and then the entire structure formed by the multiple battery cells 102 is housed within the housing 101. Alternatively, the battery 100 can be constructed by first connecting multiple battery cells 102 in series, in parallel, or in a hybrid configuration to form a battery module. The multiple battery modules are then connected in series, in parallel, or in a hybrid configuration to form a single structure, which is then housed within the housing 101. The battery 100 may also include other structures, such as a busbar assembly for electrically welding the multiple battery cells 102 together.

[0089] Each battery cell 102 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 can be cylindrical, flat, or rectangular. For example, referring to the embodiment shown in FIG3 , the length of the battery cell 102 is a first direction X, the width of the battery cell 102 is a second direction Y, and the height of the battery cell 102 is a third direction Z. The first direction X, the second direction Y, and the third direction Z are mutually perpendicular.

[0090] In some embodiments of the present application, with reference to Figures 3-6 , a battery cell 102 includes a housing 1 and a terminal 2. The terminal 2 is disposed in the housing 1, and a receiving cavity 11 is formed within the housing 1. For example, the battery cell 102 includes a cell assembly 7. The cell assembly 7 may include an active material coating portion 71 and a conductive portion 72 connected to the active material coating portion 71. The active material coating portion 71 is received in the receiving cavity 11, and the conductive portion 72 is welded to the terminal 2, such that the conductive portion 72 is electrically connected between the active material coating portion 71 and the terminal 2.

[0091] 5 and 6 , the housing 1 includes a first housing wall 13 having a mounting hole 12 therein. The pole 2 is passed through the mounting hole 12 to be mounted on the first housing wall 13. The pole 2 includes a penetration portion 33 and a first extension portion 32. The penetration portion 33 penetrates the mounting hole 12, i.e., at least a portion of the penetration portion 33 is located within the mounting hole 12. The projection of the penetration portion 33 on the projection surface falls within the projection range of the mounting hole 12 on the projection surface, with the axial direction of the mounting hole 12 as the projection direction and a plane perpendicular to the axial direction of the mounting hole 12 as the projection plane. This allows the penetration portion 33 to penetrate the mounting hole 12.

[0092] 5 and 6 , the first extension portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The first extension portion 32 extends to the outside of the outer surface or the inside of the inner surface of the first shell wall 13. The two side surfaces of the first shell wall 13 in the wall thickness direction are the outer surface and the inner surface, respectively. The inner surface is the side of the first shell wall 13 facing the accommodating cavity 11, and the outer surface is the side of the first shell wall 13 facing away from the accommodating cavity 11. The side of the outer surface facing away from the accommodating cavity 11 is the outer side of the outer surface, and the side of the inner surface facing the accommodating cavity 11 is the inner side of the inner surface. “The first extension portion 32 extends to the outside of the outer surface or the inside of the inner surface of the first shell wall 13” means: at least part of the first extension portion 32 is opposite to the first shell wall 13, with the axial direction of the mounting hole 12 as the projection direction, and the surface perpendicular to the axial direction of the mounting hole 12 as the projection surface. The projection of the first extension portion 32 on the projection surface and the projection of the first shell wall 13 on the projection surface have an intersection area, and the part of the first extension portion 32 corresponding to the intersection area is opposite to the first shell wall 13.

[0093] 5 and 6 , the battery cell 102 further includes an insulating sealing structure 8 fitted between the first shell wall 13 and the pole 2. That is, at least a portion of the insulating sealing structure 8 is sandwiched between the first shell wall 13 and the pole 2, so that the pole 2 and the first shell wall 13 are indirectly fitted through the insulating sealing structure 8, thereby achieving insulation and sealing between the first shell wall 13 and the pole 2.

[0094] As shown in Figures 6 and 7, the connection between the first extension portion 32 and the penetration portion 33 has a first corner 34 disposed toward the first shell wall 13, that is, the side of the connection between the first extension portion 32 and the penetration portion 33 close to the first shell wall 13 is formed as the first corner 34, and the first shell wall 13 includes a second corner 131 disposed corresponding to the first corner 34, that is, the corner of the first shell wall 13 close to the first corner 34 is the second corner 131. The insulating sealing structure 8 includes a third corner 81 disposed corresponding to the first corner 34, and a fourth corner 82 disposed corresponding to the second corner 131. At least one of the first corner 34, the second corner 131, the third corner 81, and the fourth corner 82 is formed as a chamfer. The chamfer can be a rounded corner or a chamfered corner, which is not limited here.

[0095] Therefore, by using chamfers instead of right angles, the force-bearing area or force-applying area can be increased, local pressure and stress concentration can be reduced, the risk of cracking of the insulating sealing structure 8 at the third corner 81 and / or the fourth corner 82, which are prone to cracking, can be reduced, the structural stability of the insulating sealing structure 8 can be improved, and the reliability of the insulating sealing structure 8 in achieving the insulating sealing effect can be improved.

[0096] Therefore, according to the above-mentioned embodiment of the present application, when the pole 2 is installed to the first shell wall 13, the pole 2 will apply a force to the insulating sealing structure 8, and the first shell wall 13 will apply a reaction force to the insulating sealing structure 8. The position of the insulating sealing structure 8 corresponding to the first corner 34 and / or the second corner 131 is subjected to relatively large force, which is a weak position and is prone to cracking. By setting at least one of the first corner 34, the second corner 131, the third corner 81 and the fourth corner 82 to be chamfered, the force receiving or force application area can be increased, the force acting on the weak position can be dispersed, and the problem of force concentration at the weak position can be improved, thereby reducing the risk of cracking of the insulating sealing structure 8 at the weak position, which is beneficial to improving the reliability of the insulating seal fit between the first shell wall 13 and the pole 2, and improving the reliability of the battery cell 102.

[0097] In some embodiments of the present application, as shown in FIG6 , the first extension portion 32 of the terminal 2 is formed by flanging and riveting. Specifically, after the terminal 2 is assembled into the mounting hole 12 via the through-hole 33, the first extension portion 32 is formed by flanging and riveting. This facilitates the processing of the terminal 2 and helps improve the connection reliability between the first extension portion 32 and the through-hole 33, thereby enhancing the assembly reliability between the terminal 2 and the first housing wall 13.

[0098] 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 welded together.

[0099] In some embodiments, as shown in Figures 7 and 8, at least one of the first corner 34 and the third corner 81 is formed as a chamfer. That is, only the first corner 34 may be formed as a chamfer, and the third corner 81 may be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or only the third corner 81 may be formed as a chamfer, and the first corner 34 may be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or, both the first corner 34 and the third corner 81 may be formed as chamfers.

[0100] When the pole 2 is assembled and fixed to the first shell wall 13, the first corner 34 easily squeezes the third corner 81, causing the insulating sealing structure 8 to crack from the position of the third corner 81. If the first corner 34 is set to a chamfered form, the area where the first corner 34 applies force to the third corner 81 can be increased, so that the force application position is dispersed, thereby reducing the force concentration on the position of squeezing the third corner 81 and reducing the risk of the insulating sealing structure 8 cracking from the position of the third corner 81; if the third corner 81 is set to a chamfered form, when the first corner 34 applies force to the third corner 81, the force area of ​​the third corner 81 can be increased, so that the force at the position of the third corner 81 is dispersed, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the third corner 81.

[0101] Thus, by forming at least one of the first corner 34 and the third corner 81 as a chamfer, the risk of the insulating sealing structure 8 cracking at the position of the third corner 81 can be reduced.

[0102] In some embodiments of the present application, as shown in Figures 7 and 8, the first corner 34 and the third corner 81 are both chamfered and of the same chamfer type. That is, the first corner 34 and the third corner 81 are both chamfered, or both are rounded. Thus, when the first corner 34 and the third corner 81 are in contact, this facilitates surface contact between the first corner 34 and the third corner 81, thereby distributing the force on the third corner 81 and improving cracking of the third corner 81. When the first corner 34 and the third corner 81 are in a clearance fit, this facilitates improving the uniformity of the clearance between the first corner 34 and the third corner 81, thereby reducing the pressure exerted by the first corner 34 on the third corner 81 and improving cracking of the third corner 81. Of course, the present application is not limited to this. For example, in other embodiments, the first corner 34 and the third corner 81 may be of different types, such as one being a chamfered corner and the other being a rounded corner.

[0103] For example, as shown in Figures 7 and 8, both the first corner 34 and the third corner 81 are formed as chamfered corners, and the chamfer radius of the third corner 81 is larger than that of the first corner 34. Thus, processing the first corner 34 into a chamfered shape helps reduce the difficulty of processing the pole 2. For example, when the first extension portion 32 is processed by riveting, it is easy to directly form the first corner 34 in a chamfered shape. Processing the third corner 81 into a chamfered shape, and setting the chamfer radius of the third corner 81 to be larger than the chamfer radius of the first corner 34, helps increase the fitting clearance between the first corner 34 and the third corner 81, reduces the pressure of the first corner 34 on the third corner 81, and thus reduces the risk of cracking of the insulating sealing structure 8 at the location of the third corner 81. In addition, processing the third corner 81 into a chamfered shape helps reduce the problem of cracking of the insulating sealing structure 8 at the third corner 81 during processing, and facilitates demolding, etc.

[0104] In some embodiments of the present application, as shown in Figures 7 and 8, regardless of whether at least one of the first corner 34 and the third corner 81 is processed into a chamfered form, a fitting gap can be set between the first corner 34 and the third corner 81. In this way, the extrusion of the first corner 34 on the third corner 81 can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the third corner 81.

[0105] In some embodiments, as shown in Figures 7 and 8, at least one of the second corner 131 and the fourth corner 82 is formed as a chamfer. That is, only the second corner 131 can be formed as a chamfer, and the fourth corner 82 can be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or only the fourth corner 82 can be formed as a chamfer, and the second corner 131 can be formed as a non-chamfered angle, such as a right angle, an acute angle, or an obtuse angle; or, both the second corner 131 and the fourth corner 82 can be formed as chamfers.

[0106] When the pole 2 is assembled and fixed to the first shell wall 13, the second corner 131 easily squeezes the fourth corner 82, causing the insulating sealing structure 8 to crack from the position of the fourth corner 82. If the second corner 131 is set to a chamfered form, the area of ​​the second corner 131 applying force to the fourth corner 82 can be increased, so that the force application position is dispersed, thereby reducing the force concentration on the position of the fourth corner 82, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the fourth corner 82; if the fourth corner 82 is set to a chamfered form, when the second corner 131 applies force to the fourth corner 82, the force area of ​​the fourth corner 82 can be increased, so that the force at the position of the fourth corner 82 is dispersed, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the fourth corner 82.

[0107] Thus, by forming at least one of the second corner 131 and the fourth corner 82 as a chamfer, the risk of the insulating sealing structure 8 cracking at the position of the fourth corner 82 can be reduced.

[0108] In some embodiments of the present application, as shown in Figures 7 and 8, the second corner 131 and the fourth corner 82 are both formed as chamfers and the chamfer types are the same. That is, the second corner 131 and the fourth corner 82 are both chamfered corners, or the second corner 131 and the fourth corner 82 are both rounded corners. Therefore, when the second corner 131 and the fourth corner 82 are in contact, it is beneficial to achieve surface contact between the second corner 131 and the fourth corner 82, thereby dispersing the force on the fourth corner 82 and improving the cracking problem of the fourth corner 82. When the second corner 131 and the fourth corner 82 are in clearance fit, it is beneficial to improve the uniformity of the fit gap between the second corner 131 and the fourth corner 82, thereby reducing the extrusion of the second corner 131 on the fourth corner 82 and improving the cracking problem of the fourth corner 82. Of course, the present application is not limited to this. For example, in other embodiments, the second corner 131 and the fourth corner 82 can also be set to different types. For example, in conjunction with Figure 9, one of the second corner 131 and the fourth corner 82 is a chamfered corner, and the other is a rounded corner.

[0109] For example, as shown in Figures 7 and 8 , both the second corner 131 and the fourth corner 82 are formed as chamfered angles. Thus, processing the second corner 131 into a chamfered angle helps reduce the difficulty of processing the first shell wall 13. Processing the fourth corner 82 into a chamfered angle also helps improve the stability and compactness of the fit between the first shell wall 13 and the insulating sealing structure 8, thereby enhancing the insulating sealing effect.

[0110] In some embodiments of the present application, as shown in Figures 7 and 8, regardless of whether at least one of the second corner 131 and the fourth corner 82 is processed into a chamfered form, the second corner 131 and the fourth corner 82 can be set to have a fitting gap. In this way, the extrusion of the second corner 131 on the fourth corner 82 can be reduced to a certain extent, thereby reducing the risk of the insulating sealing structure 8 cracking from the position of the fourth corner 82.

[0111] For example, as shown in Figures 7 and 8, the third corner 81 and the fourth corner 82 are both formed as chamfers. Thus, by setting chamfers at the positions of the third corner 81 and the fourth corner 82 of the insulating sealing structure 8, the cracking problem of the third corner 81 and the fourth corner 82 is improved, so that the insulating sealing structure 8 can be more comprehensively protected, and the requirements for whether the first corner 34 and the second corner 131 are processed as chamfers are reduced, thereby reducing the processing difficulty of the first shell wall 13 and the pole 2.

[0112] For example, as shown in Figures 7 and 8, the third corner 81 is a rounded corner, and the fourth corner 82 is a chamfered corner. This allows the wall thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 to be sufficient, thereby improving the local structural strength of the insulating sealing structure 8, further improving the cracking problem, and improving the reliability of the insulating seal. Alternatively, the fourth corner 82 can be set as a rounded corner, while the third corner 81 can be set as a chamfered corner. Alternatively, both the third corner 81 and the fourth corner 82 can be set as chamfered corners, or both can be set as rounded corners.

[0113] In addition, when the third corner 81 is formed as a chamfered corner, if the first corner 34 is set to the same chamfered form as the third corner 81, the first corner 34 can also be formed as a chamfered corner, which is beneficial to reduce the processing difficulty of the pole 2. For example, when the first extension portion 32 is processed by riveting, it is easy to directly form the first corner 34 with a chamfered shape.

[0114] In addition, when the fourth corner 82 is formed as a chamfer, if the second corner 131 is set to the same chamfer form as the fourth corner 82, the second corner 131 can also be formed as a chamfer, which is beneficial to reduce the processing difficulty of the first shell wall 13, and is beneficial to improve the matching stability and compactness of the first shell wall 13 and the insulating sealing structure 8, thereby improving the insulating sealing effect.

[0115] Exemplarily, as shown in Figure 8, the wall thickness of the insulating sealing structure 8 between the first extension portion 32 and the first shell wall 13 is H2, and the wall thickness of the insulating sealing structure 8 between the penetration portion 33 and the first shell wall 13 is H3. When the third corner 81 and the fourth corner 82 are both formed as chamfers, the wall thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 can be greater than or equal to 1.1H2 or 1.1H3, thereby improving the problem of cracking of the insulating sealing structure 8 due to insufficient local structural strength due to the formation of the third corner 81 and the fourth corner 82.

[0116] Exemplarily, the third corner 81 and the fourth corner 82 are both chamfered, and the chamfer size of the fourth corner 82 is R1, and the chamfer size of the third corner 81 is R2, wherein R2-R1≤2H2, R2-R1≤2H3, so that the wall thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 is relatively sufficient to improve the problem of cracking of the insulating sealing structure 8 due to insufficient local structural strength due to the formation of the third corner 81 and the fourth corner 82.

[0117] Exemplarily, the third corner 81 and the fourth corner 82 are both chamfered, and the chamfer size of the fourth corner 82 is C1, and the chamfer size of the third corner 81 is C2, wherein C2-C1≤2H2, C2-C1≤2H3, so that the wall thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 is relatively sufficient to improve the problem of cracking of the insulating sealing structure 8 due to insufficient local structural strength due to the formation of the third corner 81 and the fourth corner 82.

[0118] As shown in Figure 8, when the second corner 131 is formed as a chamfer, the wall thickness of the first shell wall 13 will be thinned at the position where the mounting hole 12 is defined. In some embodiments, the wall thickness of the first shell wall 13 is D1, and the minimum wall thickness of the first shell wall 13 at the second corner 131 is D2, wherein D2 can be set to be greater than 20% of D1 to avoid local deformation of the first shell wall 13 due to strength problems, causing insufficient compression of the insulating sealing structure 8, such as causing insufficient compression of the second insulating part to affect the sealing.

[0119] When the insulating sealing structure 8 is formed as an annular structure surrounding the central axis L of the mounting hole 12, and when the fourth corner 82 is formed as a chamfer, in some embodiments, as shown in FIG10 , the fourth corner 82 can be formed to be chamfered along the entire circumference of the insulating sealing structure 8; or in some embodiments, as shown in FIG11 , the fourth corner 82 can also be chamfered in a portion of the circumference of the insulating sealing structure 8, with the remaining positions being right angles, acute angles, or obtuse angles. In addition, the chamfer types of the fourth corner 82 at different positions on the circumference of the insulating sealing structure 8 can be the same or different. For example, the fourth corner 82 can be chamfered along the entire circumference of the insulating sealing structure 8, or the fourth corner 82 can be chamfered along the entire circumference of the insulating sealing structure 8, or the fourth corner 82 can be chamfered at some positions on the circumference of the insulating sealing structure 8 and chamfered at the remaining positions, and so on.

[0120] When the insulating sealing structure 8 is formed as an annular structure surrounding the central axis L of the mounting hole 12, and when the third corner 81 is formed as a chamfer, in some embodiments, the third corner 81 can be formed to be chamfered along the entire circumference of the insulating sealing structure 8; or in some embodiments, the third corner 81 can be chamfered at a portion of the circumference of the insulating sealing structure 8, and the remaining positions are right angles, acute angles, or obtuse angles. In addition, the chamfer types of the third corner 81 at different positions on the circumference of the insulating sealing structure 8 can be the same or different. For example, the third corner 81 can be chamfered along the entire circumference of the insulating sealing structure 8, or the third corner 81 can be chamfered along the entire circumference of the insulating sealing structure 8, or the third corner 81 can be chamfered at some positions on the circumference of the insulating sealing structure 8 and chamfered at the remaining positions, and so on.

[0121] Similarly, when the first corner 34 is chamfered, the first corner 34 can be chamfered in the entire circumference as described above. When the second corner 131 is chamfered, the second corner 131 can be chamfered in the entire circumference as described above.

[0122] In some embodiments, as shown in FIG11 , the insulating sealing structure 8 is formed into a runway shape (also known as an oblong) surrounding the central axis L of the mounting hole 12. The runway shape is composed of a rectangle and an arc-shaped edge located on the wide side of the rectangle. At the connection position between the long side and the arc-shaped edge of the rectangle (for example, the position P shown in FIG11 ), cracking is less likely to occur, and the third corner 81 and the fourth corner 82 may not be chamfered at the corresponding connection position.

[0123] In some embodiments, as shown in FIG11 , the insulating sealing structure 8 is formed into a racetrack shape (also known as an oblong) surrounding the central axis L of the mounting hole 12. The racetrack shape is composed of a rectangle and arcuate edges located on the wide side of the rectangle. The arcuate edges may be rounded, and the long sides may be chamfered. Alternatively, the arcuate edges may be chamfered, and the long sides may be rounded. This allows for flexible design in a variety of forms.

[0124] In some embodiments, there is a fitting gap between the penetration portion 33 and the insulating sealing structure 8, so that the penetration portion 33 is not easily directly squeezed into the insulating sealing structure 8, thereby reducing the force transmitted to the insulating sealing structure 8, reducing the damage to the insulating sealing structure 8, and protecting the insulating sealing structure 8.

[0125] In some embodiments, as shown in Figure 12, the insulating sealing structure 8 includes a first part 83 and a second part 84 integrated into a one-piece piece. For example, as shown in Figure 12, the first part 83 and the second part 84 constitute a first insulating seal 85, and the first insulating seal 85 is an inseparable one-piece piece. The material hardness of the first part 83 is less than the material hardness of the second part 84. The first part 83 defines the third corner 81 and / or the fourth corner 82, that is, the first part 83 includes a first sub-portion 831 arranged relative to the second part 84 near the third corner 81, or the first part 83 includes a second sub-portion 832 arranged relative to the second part 84 near the fourth corner 82, or the first part 83 includes a first sub-portion 831 arranged relative to the second part 84 near the third corner 81 and a second sub-portion 832 arranged relative to the second part 84 near the fourth corner 82.

[0126] When the first portion 83 includes the first sub-portion 831, the material hardness of the first sub-portion 831 is less than that of the second portion 84. When the pole 2 is assembled and fixed to the first housing wall 13, the pole 2 will squeeze the insulating sealing structure 8. The insulating sealing structure 8 is subjected to relatively large forces at the third corner 81 and is prone to cracking. By providing the first sub-portion 831, whose material hardness is softer than that of the second portion 84, at the third corner 81, the first sub-portion 831 is easily compressed and deformed when subjected to forces, absorbing the forces, thereby reducing the risk of the insulating sealing structure 8 cracking at the third corner 81.

[0127] When the first portion 83 includes the second sub-portion 832, the material hardness of the second sub-portion 832 is less than the material hardness of the second portion 84. When the pole 2 is assembled and fixed to the first shell wall 13, the pole 2 will squeeze the insulating sealing structure 8, and the insulating sealing structure 8 will squeeze the first shell wall 13. The first shell wall 13 will apply a reaction force to the insulating sealing structure 8. The reaction force applied by the second corner 131 of the first shell wall 13 to the insulating sealing structure 8 at the fourth corner 82 is relatively large, making it prone to cracking. By providing the second sub-portion 832 at the fourth corner 82, which is made of a material with a softer hardness than the second portion 84, the second sub-portion 832 is easily compressed and deformed when subjected to force, absorbing the force, thereby reducing the risk of the insulating sealing structure 8 cracking at the fourth corner 82.

[0128] It is worth noting that the materials of the first portion 83 and the second portion 84 are not limited and can be selected according to actual requirements. For example, the material of the first portion 83 can be a compressible rubber material or plastic material, such as PFA (perfluoroalkyl), PP (polypropylene), FKM (fluororubber), or EPDM (ethylene propylene diene monomer), so that the first portion 83 has good compression deformation performance, thereby more effectively improving the cracking problem. For example, the material of the second portion 84 can be an insulating material with higher hardness, such as PPS (polyphenylene sulfide, a new high-performance thermoplastic resin) or LCP (liquid crystal polymer), so that the second portion 84 has good hardness and plays a supporting role, so that the compression of the insulating sealing structure 8 can be better controlled, thereby improving the sealing performance.

[0129] It is worth noting that the first portion 83 may also include a first sub-portion 831 and a second sub-portion 832, thereby more comprehensively reducing the risk of cracking at weak locations of the insulating sealing structure 8 and improving the structural reliability of the insulating sealing structure 8. Furthermore, it is worth noting that the materials of the first sub-portion 831 and the second sub-portion 832 may be the same or different, and may be specifically set according to actual circumstances.

[0130] In some embodiments of the present application, as shown in FIG9 , the insulating seal structure 8 includes a first insulating seal 85 defining a third corner 81 and a fourth corner 82, wherein a first gasket 91 is provided between the first insulating seal 85 and the first extension 32. Thus, when the pole 2 is mounted on the first housing wall 13, when the first extension 32 presses the first insulating seal 85 toward the first housing wall 13 (e.g., presses the insulating seal structure 8 along the axial direction of the mounting hole 12), the first gasket 91 provided between the first insulating seal 85 and the first extension 32 can reduce a portion of the applied force, thereby reducing the applied force transmitted to the first insulating seal 85, thereby reducing damage to the first insulating seal 85 and protecting the first insulating seal 85.

[0131] It is worth noting that the material hardness of the first gasket 91 and the first insulating seal 85 are not limited. For example, the material hardness of the first gasket 91 can be greater than the material hardness of the first insulating seal 85. As a result, the first gasket 91 can effectively attenuate the extrusion force transmitted to the first insulating seal 85, more effectively improving the cracking problem of the first insulating seal 85. For example, the first insulating seal 85 can be plastic and the first gasket 91 can be metal, so that the material hardness of the first gasket 91 can be greater than the material hardness of the first insulating seal 85. For example, the first gasket 91 can be made of steel, such as SUS304, SUS316, SPCC, etc., or aluminum, such as Al1060, etc.

[0132] It should be noted that when the first gasket 91 is provided, the third corner 81 may or may not be chamfered. For example, when the first gasket 91 is provided, the fourth corner 82 is chamfered, thereby improving the cracking problem at the third and fourth corners 81 and 82.

[0133] In some embodiments of the present application, as shown in FIG9 , the insulating sealing structure 8 includes a first insulating seal 85 defining a third corner 81 and a fourth corner 82. A second gasket 92 is disposed between the first insulating seal 85 and a surface of the first housing wall 13 facing the first extension 32. The material hardness of the second gasket 92 is less than the material hardness of the first insulating seal 85. For example, when the first extension 32 extends to the outside of the outer surface of the first housing wall 13, the second gasket 92 is disposed between the first extension 32 and the outer surface of the first housing wall 13. For another example, when the first extension 32 extends to the inside of the inner surface of the first housing wall 13, the second gasket 92 is disposed between the first extension 32 and the inner surface of the first housing wall 13.

[0134] Therefore, when the pole 2 is installed on the first shell wall 13, when the pole 2 squeezes the first insulating seal 85 toward the first shell wall 13 (for example, the first insulating seal 85 is squeezed along the axial direction of the mounting hole 12), the first insulating seal 85 can transmit the force to the second gasket 92. Since the material hardness of the second gasket 92 is relatively small, it can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the first insulating seal 85, reducing damage to the first insulating seal 85, and protecting the first insulating seal 85.

[0135] It should be noted that when the second gasket 92 is provided, the fourth corner 82 may or may not be chamfered. For example, when the second gasket 92 is provided, the third corner 81 is chamfered, thereby improving the cracking problem at the third corner 81 and the fourth corner 82.

[0136] For example, when at least one of the first gasket 91 and the second gasket 92 is provided, the third corner 81 and / or the fourth corner 82 of the first insulating seal 85 may not be provided with the first portion 83, thereby simplifying the structure and processing of the first insulating seal 85. However, the present application is not limited thereto. For example, when at least one of the first gasket 91 and the second gasket 92 is provided, the third corner 81 and / or the fourth corner 82 of the first insulating seal 85 may also be provided with the first portion 83, thereby further improving the cracking problem of the first insulating seal 85.

[0137] In some embodiments of the present application, as shown in FIG13 , the pole 2 further includes a second extension portion 38 connected to the through-hole portion 33 and extending relative to the through-hole 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. For example, if the first extension portion 32 extends to the outer side of the first shell wall 13 , the second extension portion 38 extends to the inner side of the first shell wall 13 . If the first extension portion 32 extends to the inner side of the first shell wall 13 , the second extension portion 38 extends to the outer side of the first shell wall 13 . The through-hole portion 33 and the second extension portion 38 form a second pole portion 39 . The insulating seal structure 8 includes a second insulating seal 86 engaged between the second pole portion 39 and the first shell wall 13 . The second insulating seal 86 is provided separately from the first insulating seal 85 . It is understood that the first pole portion 35 and the second pole portion 39 share the through-hole portion 33 .

[0138] Thus, since the pole 2 includes the first extension portion 32 and the second extension portion 38 disposed on the inner and outer sides of the first shell wall 13, the cooperation between the pole 2 and the first shell wall 13 can be more stable and secure. Moreover, since the insulating sealing structure 8 includes the first insulating seal 85 and the second insulating seal 86 disposed separately, the first insulating seal 85 and the second insulating seal 86 can be installed separately, thereby reducing the difficulty of assembly and ensuring the insulating sealing cooperation effect of the pole 2 and the first shell wall 13 at all locations.

[0139] In addition, in some embodiments, with reference to FIG13 , the insulating sealing structure 8 may further include a third insulating seal 87. The third insulating seal 87 may be disposed between the second extension 38 and the housing 1 and abut the active material coating portion 71 of the cell assembly 7. This not only improves the insulation between the cell assembly 7 and the housing 1, but also improves the stability of the fit between the cell assembly 7 and the housing 1, thereby improving the reliability of the battery cell 102. Alternatively, the third insulating seal 87 may be eliminated, and an insulating bracket (not shown) may be provided at the end of the active material coating portion 71. The insulating bracket abuts the inner surface of the housing 1, thereby facilitating protection of the cell assembly 7 when the cell assembly 7 is installed in the housing 1, preventing the housing 1 from scratching the cell assembly 7, and improving the insulation between the cell assembly 7 and the housing 1. This also improves the stability of the fit between the cell assembly 7 and the housing 1, thereby improving the reliability of the battery cell 102.

[0140] In some embodiments of the present application, as shown in Figure 13, the pole 2 includes a pole body 3 and a pole cover 4, the pole body 3 includes a first pole portion 35 and a second pole portion 39, the first extension portion 32 extends to the outside of the outer surface of the first shell wall 13, the pole cover 4 is covered on the side of the first pole portion 35 away from the second pole portion 39, and the pole body 3 is welded to the pole cover 4, and the material hardness of the second insulating seal 86 is less than the material hardness of the first insulating seal 85.

[0141] Therefore, the material hardness of the first insulating seal 85 is greater than that of the second insulating seal 86, and the second insulating seal 86 is more easily compressed and deformed than the first insulating seal 85 and has a better sealing effect, but the heat resistance of the first insulating seal 85 is stronger than that of the second insulating seal 86. For example, the first insulating seal 85 is a plastic part and the second insulating seal 86 is a rubber part. Therefore, when the pole body 3 and the pole cover 4 are welded, the thermal impact on the second insulating seal 86 can be minimized, thereby improving the sealing reliability between the first shell wall 13 and the pole 2.

[0142] In some embodiments of the present application, as shown in Figure 13, the first extension portion 32 protrudes from the penetration portion 33 toward the outside of the first shell wall 13 to define a recessed groove 31 between the first extension portion 32 and the penetration portion 33. The edge of the pole cover plate 4 is arranged in the recessed groove 31 and is penetrated and welded to the penetration portion 33. The welded structure formed by the welding is separated from the first extension portion 32.

[0143] As a result, the shrinkage stress generated by the solidification of the molten pool formed by the welding can be blocked by the above-mentioned gap, making it difficult or less likely to be transmitted to the first extension portion 32, thereby improving the warping problem of the first extension portion 32, allowing the first extension portion 32 to press against the insulating sealing structure 8, thereby improving the insulating sealing effect. Moreover, because the edge of the pole cover plate 4 is disposed within the recessed groove 31 and is penetrated and welded to the penetration portion 33, rather than being butt-welded to the first extension portion 32, there is no need to ensure a small assembly gap between the edge of the pole cover plate 4 and the first extension portion 32 to meet the butt welding requirements. The gap between the edge of the pole cover plate 4 and the first extension portion 32 can be larger, thereby improving the compatibility of the pole body 3 and facilitating the reduction of the processing accuracy of the pole cover plate 4 and the pole body 3.

[0144] In some embodiments of the present application, as shown in FIG13 , a battery cell 102 has an accommodating cavity 11 formed on the inner side of the first shell wall 13. The electrode 2 includes a electrode body 3, which is formed with an accommodating groove 36 that opens in a direction away from the accommodating cavity 11. The electrode body 3 has a connecting hole 37 that passes through the groove wall of the accommodating groove 36 on one side near the accommodating cavity 11 and connects the accommodating cavity 11 with the accommodating groove 36. For example, when the penetration portion 33 is annular, the accommodating groove 36 is located in the inner ring region of the penetration portion 33. For example, the accommodating groove 36 can be jointly defined by the penetration portion 33 and a support portion located in the inner ring region of the penetration portion 33, and the connecting hole 37 passes through the support portion.

[0145] Thus, when the electrolyte is injected into the battery cell 102, the electrolyte can be injected into the receiving groove 36 and then flow toward the receiving cavity 11 through the connecting hole 37, wherein the receiving groove 36 can play the role of buffering the electrolyte to improve the problems of electrolyte splashing, overflowing, etc. Moreover, the side wall of the receiving groove 36 (that is, the groove wall extending from the notch of the receiving groove 36 toward the receiving cavity 11) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell 1, there is no need to perform special processing on the shell 1, which is conducive to reducing the structural complexity and processing difficulty of the shell 1.

[0146] 13 , the side of the recess 31 facing the central axis L of the mounting hole 12 is open to communicate with the receiving groove 36 . This improves the compactness of the coupling between the pole body 3 and the pole cover 4 and simplifies the structure and processing of the pole cover 4 .

[0147] In some embodiments of the present application, as shown in Figure 13, the battery cell 102 includes a battery cell assembly 7, the battery cell assembly 7 includes an active material coating portion 71 received in the accommodating cavity 11, and a conductive portion 72 connected to the active material coating portion 71, and the conductive portion 72 is passed through the connecting hole 37 to be at least partially received in the accommodating groove 36.

[0148] It is worth noting that there may be one or more communicating holes 37, and the conductive portion 72 may be provided through at least one of the communicating holes 37. For example, at least one communicating hole 37 is capable of passing electrolyte. For example, at least one communicating hole 37 is left vacant (i.e., not provided with the conductive portion 72), thereby enabling electrolyte to pass through without being obstructed by the conductive portion 72. For another example, at least one communicating hole 37 is still capable of passing electrolyte after being provided with the conductive portion 72.

[0149] Therefore, by accommodating at least a portion of the conductive part 72 in the receiving groove 36, at least a portion of the conductive part 72 occupies the space in the receiving groove 36, thereby reducing the space occupied by the conductive part 72 in the receiving cavity 11, saving space in the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, thereby facilitating the improvement of the energy density of the battery cell 102, or reducing the size of the battery cell 102 when the energy density of the battery cell 102 remains unchanged.

[0150] It is understandable that the active material coating portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only the pole ear portion, or may include the pole ear portion and an adapter electrically connected to the pole ear portion, etc., which is not limited here.

[0151] In some embodiments, the conductive portion 72 is welded to the pole body 3 to form an electrical connection, thereby enabling the battery cell assembly 7 to be output from the electrode at the pole body 3. For example, as shown in FIG13 , the conductive portion 72 is welded to the side wall of the accommodating groove 36 close to the accommodating cavity 11, thereby improving the compactness of the fit and facilitating the welding operation between the two. Of course, the present application is not limited to this. In other embodiments, the conductive portion 72 can also be configured to be welded to the pole cover plate 4 to form an electrical connection, which is not limited here.

[0152] In some embodiments of the present application, as shown in Figure 14, the pole 2 includes a pole cover 4 covering the pole body 3, and a liquid injection hole 43 that can be connected to the accommodating groove 36 is formed on the pole cover 4. The battery cell 102 also includes a sealing structure 6 for sealing the liquid injection hole 43.

[0153] Thus, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43 first, or the sealing structure 6 is in a state of opening the injection hole 43, and the electrolyte can be injected into the receiving tank 36 through the injection hole 43. After the injection, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a state of closing the injection hole 43, thereby sealing the injection hole 43 to prevent the electrolyte from overflowing and prevent foreign matter from entering the receiving cavity 11 through the injection hole 43, thereby improving the reliability of the battery cell 102.

[0154] Therefore, by processing the injection hole 43 on the pole cover 4, the opening is relatively small and located outside, and the injection inlet can be reliably sealed more easily through the sealing structure 6, thereby improving the working reliability of the battery cell 102 and realizing a flexible and diversified design of the sealing structure 6.

[0155] In some embodiments, as shown in FIG14 , the pole cover 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 4 from the outside of the pole cover 4 (i.e., the side away from the accommodating cavity 11 ). In this way, by setting the sealing structure 6 to be installed to the pole cover 4 from the outside to seal the liquid injection hole 43, the sealing structure 6 can be installed after liquid injection, which can ensure the sealing of the liquid injection hole 43. The installation position is close to the outside, which facilitates the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 does not adversely affect the connection between the pole body 3 and the pole cover 4, thereby ensuring the reliability of the connection between the pole cover 4 and the pole body 3.

[0156] The sealing structure 6 can be detachable or fixed. For example, when the sealing structure 6 is detachable, it is convenient for maintaining the injection hole 43. For example, when the electrolyte needs to be replenished, the sealing structure 6 can be removed, the injection hole 43 can be opened, and the electrolyte can be replenished into the accommodating cavity 11 through the injection hole 43. Then, the sealing structure 6 can be reinstalled. For example, the sealing structure 6 can be detachably connected to the pole cover 4 by means of threads or screws, thereby facilitating disassembly and assembly.

[0157] Exemplarily, when the sealing structure 6 is in a non-detachable fixed form, the sealing structure 6 can be fixed to the pole cover 4 by welding, riveting, etc., so as to improve the sealing reliability of the sealing structure 6 to the injection hole 43. For example, the injection hole 43 can be in a multi-segment form, and the sealing structure 6 can include a first sealing member 61 that is interference fit with the injection hole 43, and a second sealing member 62 that covers the first sealing member 61 and is welded to the pole cover 4.

[0158] Alternatively, in some embodiments, the second sealing member 62 may be configured to be detachably connected to the pole cover 4 by means of a screw-on fastener, so as to restrict the first sealing member 61 to a position where it is interference-fitted with the liquid injection hole 43 .

[0159] In some embodiments of the present application, as shown in FIG14 , at least a portion of the sealing structure 6 is embedded in the liquid injection hole 43. That is, the sealing structure 6 can be entirely embedded in the liquid injection hole 43, or only a portion of the sealing structure 6 can be embedded in the liquid injection hole 43. Thus, on the one hand, the space within the liquid injection hole 43 can be fully utilized, thereby improving the sealing reliability of the sealing structure 6 on the liquid injection hole 43. On the other hand, the height of the sealing structure 6 protruding from the liquid injection hole 43 can be reduced, reducing the space occupied by the sealing structure 6 outside the pole cover 4, thereby reducing the interference effect on the confluence component 103, increasing the connection area between the confluence component 103 and the pole cover 4, and improving the flow efficiency.

[0160] In some embodiments of the present application, as shown in FIG14 , the first shell wall 13 is an integrally formed cover plate, or, as shown in FIG13 , the housing 1 further includes a second shell wall 14, the first shell wall 13 and at least one second shell wall 14 are integrally formed, and the second shell wall 14 extends toward one side in the thickness direction of the first shell wall 13. Thus, the structural position of the terminal 2 can be flexibly designed, thereby increasing the applicability of the battery cell 102 of the embodiments of the present application.

[0161] It is worth noting that the second shell wall 14 can extend from an edge of the first shell wall 13. When the first shell wall 13 is rectangular, at least one of the four edges of the first shell wall 13 can extend into the second shell wall 14. For example, only one edge of the first shell wall 13 extends into the second shell wall 14. Alternatively, only two edges of the first shell wall 13 can extend into the second shell wall 14. Alternatively, three edges of the first shell wall 13 can extend into the second shell wall 14. Alternatively, all four edges of the first shell wall 13 can extend into the second shell wall 14. For example, when the housing 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 13.

[0162] 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.

[0163] According to the second embodiment of the present application, the present embodiment further provides a battery 100, comprising a battery cell 102 according to any of the above-described solutions. It is worth noting that the battery 100 according to the embodiment of the present application may or may not include a housing. As a result, the reliability of the battery cell 102 according to the embodiment of the present application is improved, thereby facilitating improved performance of the battery 100.

[0164] For example, as shown in FIG15 , the battery 100 may further include a busbar 103 , and there are multiple battery cells 102 , with at least two of them being electrically connected via the busbar 103 . This allows for the series and / or parallel connection of multiple battery cells 102 . For example, when multiple battery cells 102 are connected in series, the anode pole cover 4 of one battery cell 102 is connected to the cathode pole cover 4 of the next battery cell 102 via one busbar 103 , while the cathode pole cover 4 of the battery cell 102 is connected to the anode pole cover 4 of the previous battery cell 102 via another busbar 103 .

[0165] According to a third embodiment of the present application, an electrical device is provided, comprising a battery 100 according to any of the aforementioned solutions, wherein the battery 100 is configured to provide electrical energy to the electrical device. The electrical device may be any of the aforementioned devices or systems employing the battery 100. The improved performance of the battery 100 facilitates improved operating performance of the electrical device.

[0166] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0167] The battery cell 102 includes a housing 1, a terminal 2, and an insulating seal structure 8. The housing 1 includes a first housing wall 13 having a mounting hole 12 therein. The terminal 2 includes a penetration portion 33 that penetrates the mounting hole 12, a first extension portion 32 connected to the penetration portion 33 and extending relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12, and a second extension portion 38 connected to the penetration portion 33 and extending relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The first extension portion 32 extends to the outside of the outer surface of the first housing wall 13, and the second extension portion 38 extends to the inside of the inner surface of the first housing wall 13. The first extension portion 32 of the terminal 2 is formed by flanging and riveting.

[0168] The penetration portion 33 and the first extension portion 32 constitute a first pole portion 35, and the insulating sealing structure 8 includes a first insulating seal 85 that is fitted between the first pole portion 35 and the first shell wall 13. The penetration portion 33 and the second extension portion 38 constitute a second pole portion 39, and the insulating sealing structure 8 includes a second insulating seal 86 that is fitted between the second pole portion 39 and the first shell wall 13 and is separately arranged from the first insulating seal 85.

[0169] The connection between the first extension portion 32 and the penetration portion 33 has a first corner 34 disposed toward the first housing wall 13. The first housing wall 13 includes a second corner 131 disposed corresponding to the first corner 34. The first insulating seal 85 includes a third corner 81 disposed corresponding to the first corner 34, and a fourth corner 82 disposed corresponding to the second corner 131. At least one of the first corner 34 and the third corner 81 is formed as a chamfer, and at least one of the second corner 131 and the fourth corner 82 is formed as a chamfer.

[0170] During assembly, the first insulating seal 85, the second insulating seal 86 and the pole 2 can be first installed at the mounting hole 12 of the first shell wall 13, and then the first extension portion 32 can be processed by riveting. At this time, the pole 2 will apply a force to the first insulating seal 85, and the first shell wall 13 will apply a reaction force to the first insulating seal 85. The force on the first insulating seal 85 corresponding to the first corner 34 and / or the second corner 131 is relatively concentrated, and it is a weak position that is prone to cracking. By forming at least one of the first corner 34 and the third corner 81 as a chamfer, and forming at least one of the second corner 131 and the fourth corner 82 as a chamfer, the force on the third corner 81 and the fourth corner 82 can be dispersed, thereby reducing the risk of the first insulating seal 85 cracking from the third corner 81 and the fourth corner 82.

[0171] It should be noted that, unless there is any conflict, the embodiments and features in the embodiments of this application can be combined with each other.

[0172] The above are merely preferred embodiments of the present application and are not intended to limit the present application. Those skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery cell, wherein: include: A first shell wall, wherein the first shell wall has a mounting hole; A pole, comprising a penetration portion penetrated through the mounting hole, and a first extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, wherein the first extension portion extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall, and a connection between the first extension portion and the penetration portion has a first corner disposed toward the first shell wall, and the first shell wall includes a second corner disposed corresponding to the first corner; An insulating sealing structure is fitted between the first shell wall and the pole, and includes a third corner arranged corresponding to the first corner, and a fourth corner arranged corresponding to the second corner, and at least one of the first corner, the second corner, the third corner and the fourth corner is formed as a chamfer.

2. The battery cell according to claim 1, wherein: At least one of the first corner and the third corner is formed as a chamfer.

3. The battery cell according to claim 2, wherein: The first corner and the third corner are both formed as chamfers and the chamfers are of the same type.

4. The battery cell according to claim 3, wherein: The first corner and the third corner are both formed as rounded corners, and a rounded corner radius of the third corner is greater than a rounded corner radius of the first corner.

5. The battery cell according to any one of claims 1 to 4, wherein: A matching gap is provided between the first corner and the third corner.

6. The battery cell according to any one of claims 1 to 5, wherein: At least one of the second corner and the fourth corner is formed as a chamfer.

7. The battery cell according to claim 6, wherein: The second corner and the fourth corner are both formed as chamfers and the types of the chamfers are the same.

8. The battery cell according to any one of claims 1 to 7, wherein: A matching gap is provided between the second corner and the fourth corner.

9. The battery cell according to any one of claims 1 to 8, wherein: The third corner and the fourth corner are both formed as chamfers, the third corner is formed as a rounded corner, and the fourth corner is formed as a chamfered corner.

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

11. The battery cell according to any one of claims 1 to 10, wherein: The first extension portion of the pole is formed by flanging and riveting.

12. The battery cell according to any one of claims 1 to 11, wherein: The insulating sealing structure includes a first part and a second part integrated into one piece, the material hardness of the first part is smaller than the material hardness of the second part, and the first part defines the third corner and / or the fourth corner.

13. The battery cell according to any one of claims 1 to 12, wherein: The insulating sealing structure includes a first insulating seal defining the third corner and the fourth corner, wherein a first gasket is provided between the first insulating seal and the first extension portion, and / or a second gasket is provided between the first insulating seal and a side surface of the first shell wall facing the first extension portion, and the material hardness of the second gasket is less than the material hardness of the first insulating seal.

14. The battery cell according to any one of claims 1 to 13, wherein: The pole also includes a second extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the second extension portion and the first extension portion extend to the inner and outer sides of the first shell wall respectively, the penetration portion and the first extension portion constitute a first pole portion, the penetration portion and the second extension portion constitute a second pole portion, the insulating sealing structure includes a first insulating seal fitted between the first pole portion and the first shell wall, and a second insulating seal fitted between the second pole portion and the first shell wall, the second insulating seal and the first insulating seal are separately arranged.

15. The battery cell according to claim 14, wherein: The pole includes a pole body and a pole cover plate, the pole body includes the first pole portion and the second pole portion, the first extension portion extends to the outside of the outer surface of the first shell wall, the pole cover plate is covered on a side of the first pole portion away from the second pole portion, and the pole body is welded to the pole cover plate, and the material hardness of the second insulating seal is less than the material hardness of the first insulating seal.

16. The battery cell according to claim 15, wherein: The first extension portion protrudes from the penetration portion toward the outer side of the first shell wall to define a recessed groove between the first extension portion and the penetration portion. The edge of the pole cover plate is arranged in the recessed groove and is penetrated and welded with the penetration portion. The welding structure formed by welding is spaced apart from the first extension portion.

17. The battery cell according to any one of claims 1 to 16, wherein: The battery cell is provided with a receiving cavity on the inner side of the first shell wall, the pole includes a pole body, the pole body is provided with a receiving groove which is open in a direction away from the receiving cavity, the pole body is provided with a connecting hole, the connecting hole penetrates the groove wall on one side of the receiving groove close to the receiving cavity, and connects the receiving cavity with the receiving groove.

18. The battery cell according to claim 17, wherein: The battery cell comprises a cell assembly, the cell assembly comprises an active material coating portion received in the receiving cavity, and a conductive portion connected to the active material coating portion, the conductive portion is passed through the connecting hole to be at least partially received in the receiving groove.

19. The battery cell according to any one of claims 17 to 18, wherein: The pole includes a pole cover plate which is covered on the pole body, and a liquid injection hole which can be communicated with the receiving groove is formed on the pole cover plate. The battery cell also includes a sealing structure for sealing the liquid injection hole.

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

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

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