Battery monomer, battery and electric device

Abstract

The invention provides a battery monomer, a battery and a power utilization device, and belongs to the technical field of batteries. Wherein the battery monomer comprises a first shell wall, a pole and an insulation sealing structure, the pole comprises a penetrating part and a first extension part, the first extension part extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall, and a first corner facing the first shell wall is arranged at the joint of the first extension part and the penetrating part; the first shell wall comprises a second corner arranged corresponding to the first corner, the insulation sealing structure is matched between the first shell wall and the pole column and comprises 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 forms a chamfer. According to the battery monomer, the risk of cracking of the insulation sealing structure is reduced, the reliability of insulation sealing matching between the first shell wall and the pole is improved, and the reliability of the battery monomer is improved.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery cell, a battery and an electrical device. Background Art

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

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

[0004] In the first aspect, an embodiment of the present application provides a battery cell, including a first shell wall, a pole and an insulating sealing structure, the first shell wall having a mounting hole, the pole including a penetration portion penetrating the mounting hole, and a first extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the first extension portion extending to the outside of the outer surface 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, and at least one of the first corner, the second corner, the third corner and the fourth corner is formed as a chamfer.

[0005] 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 insulating sealing structure is subjected to relatively large force at the position corresponding to the first corner and / or the second corner, which is a weak position that 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.

[0006] In some embodiments, at least one of the first corner and the third corner is formed as a chamfer.

[0007] In the above technical solution, when the pole is assembled and fixed to the first shell wall, the first corner is easy to squeeze the third corner, so that the insulating sealing structure cracks from the position of the third corner. If the first corner is set to a chamfered form, the area where the first corner applies force to the third corner can be increased, so that the force application position is dispersed, thereby reducing the concentration of the force on the position of the third corner and reducing the risk of the insulating sealing structure cracking from the position of the third corner; if the third corner is set to a chamfered form, when the first corner applies force to the third corner, the force area of ​​the third corner can be increased, so that the force at the position of the third corner is dispersed, thereby reducing the risk of the insulating sealing structure cracking from the position of the third corner. Therefore, by forming at least one of the first corner and the third corner into a chamfer, the risk of the insulating sealing structure cracking from the position of the third corner can be reduced.

[0008] In some embodiments, the first corner and the third corner are both formed as chamfers and the types of the chamfers are the same.

[0009] 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 have a clearance fit, it is beneficial to improve the uniformity of the fitting clearance 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.

[0010] In some embodiments, the first corner and the third corner are both formed as rounded corners, and the rounded radius of the third corner is greater than the rounded radius of the first corner.

[0011] In the above technical solution, the first corner is processed into a rounded 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 rounded shape. The third corner is also processed into a rounded shape, and the rounded radius of the third corner is set to be larger than the rounded 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 rounded 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.

[0012] In some embodiments, there is a fitting gap between the first corner and the third corner.

[0013] 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 cracking of the insulating sealing structure from the position of the third corner.

[0014] In some embodiments, at least one of the second corner and the fourth corner is formed as a chamfer.

[0015] In the above technical solution, when the pole is assembled and fixed to the second shell wall, the second corner is easy to squeeze the fourth corner, so that the insulating sealing structure cracks from the position of the fourth corner. If the second corner is set to a chamfered form, 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 to squeeze the position of the fourth corner, thereby reducing the risk of the insulating sealing structure cracking from the position of the fourth corner; if the fourth corner is set to a chamfered form, 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 position of the fourth corner is dispersed, thereby reducing the risk of the insulating sealing structure cracking from the position of 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 from the position of the fourth corner can be reduced.

[0016] In some embodiments, the second corner and the fourth corner are both formed as chamfers and the types of the chamfers are the same.

[0017] In the above technical scheme, 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 have a clearance fit, it is beneficial to improve the uniformity of the fitting clearance 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.

[0018] In some embodiments, a fitting gap is provided between the second corner and the fourth corner.

[0019] 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 cracking of the insulating sealing structure at the position of the fourth corner.

[0020] In some embodiments, the third corner and the fourth corner are both formed as chamfers, and the third corner is formed as a rounded corner, and the fourth corner is formed as a chamfered corner.

[0021] In the above technical solution, by setting chamfers at the positions of the third corner and the fourth corner of the insulating sealing structure to improve the cracking problem of the third corner and the fourth corner, the insulating sealing structure can be more comprehensively protected, and the requirements for whether the first corner and the second corner are processed as chamfers are reduced, thereby reducing the difficulty of processing the first shell wall and the pole. Moreover, the third corner is a rounded corner and the fourth corner is a chamfered corner, so that the wall thickness of the insulating sealing structure between the third corner and the fourth corner is sufficient, so as to improve the local structural strength of the insulating sealing structure, further improve the cracking problem, and improve the reliability of the insulating seal.

[0022] In some embodiments, a matching gap is provided between the penetration portion and the insulating sealing structure.

[0023] In the above technical solution, the penetration portion is not easy to directly squeeze 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.

[0024] In some embodiments, the first extension portion of the pole is formed by riveting with flanges.

[0025] In the above technical solution, the processing of the pole is convenient, and it is beneficial to improve the connection reliability between the first extension portion and the penetration portion, and improve the assembly reliability of the pole and the first shell wall.

[0026] In some embodiments, the insulating sealing structure includes a first part and a second part integrated into one piece, the material hardness of the first part is less than the material hardness of the second part, and the first part defines a third corner and / or a fourth corner.

[0027] 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.

[0028] 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.

[0029] In the above technical solution, when the pole is installed on the first shell wall, when the first extension part presses the first insulating seal in the direction of the first shell wall, since the first gasket is provided between the first insulating seal and the first extension part, the first gasket can reduce a part of the force, thereby reducing the force transmitted to the first insulating seal, thereby reducing the damage to the first insulating seal, and protecting the first insulating seal. When the pole is installed on the first shell wall, when the pole presses the first insulating seal in the direction of the first shell wall, the first insulating seal can transmit the force to the second gasket. Since the material hardness of the second gasket is relatively small, it can be compressed and deformed to absorb the force, thereby reducing the reaction force fed back to the first insulating seal, reducing the damage to the first insulating seal, and protecting the first insulating seal.

[0030] 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.

[0031] In the above technical solution, since the pole includes the first extension portion and the second extension portion disposed on both sides of the first shell wall, the matching between the pole and the first shell wall can be more stable and reliable. 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 matching effect between the pole and the first shell wall at all locations.

[0032] 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 covered 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.

[0033] 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, but 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.

[0034] In some embodiments, the first extension portion protrudes out of the penetration portion toward the outside of the first shell wall to define a recessed groove between the first extension portion and the penetration portion. The edge of the pole cover plate is arranged in the recessed groove and is penetrated and welded with the penetration portion. The welding structure formed by welding is separated from the first extension portion.

[0035] In the above technical solution, the shrinkage stress generated by the solidification of the molten pool formed by welding can be blocked by the above-mentioned interval, and is difficult or less transmitted to the first extension part, thereby improving the warping problem of the first extension part, so that the first extension part can compress the insulating sealing structure and improve the insulating sealing effect. In addition, since the edge of the pole cover plate is arranged in the sink and is penetrated and welded with the penetration part, rather than being butt-welded with the first extension part, it is not necessary to ensure that the assembly gap between the edge of the pole cover plate and the first extension part is small in order to meet the butt welding requirements, so that the interval between the edge of the pole cover plate and the first extension part can be larger, thereby improving the compatibility of the pole body, which is conducive to reducing the processing accuracy of the pole cover plate and the pole body.

[0036] In some embodiments, the battery cell forms a accommodating cavity on the inner side of the first shell wall, the pole includes a pole body, a accommodating groove open in a direction away from the accommodating cavity is formed on the pole body, and a connecting hole is provided on the pole body, the connecting hole passes through the groove wall on one side of the accommodating groove close to the accommodating cavity, and connects the accommodating cavity with the accommodating groove.

[0037] In the above technical solution, when injecting electrolyte into the battery cell, the electrolyte can be injected into the receiving groove and then flow toward the receiving cavity through the connecting hole, wherein the receiving groove can play the role of buffering the electrolyte to improve the problems of electrolyte splashing and overflow. Moreover, the side wall of the receiving groove can block the electrolyte splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell, there is no need to perform special processing on the shell, which is conducive to reducing the structural complexity and processing difficulty of the shell.

[0038] 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.

[0039] 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.

[0040] In some embodiments, the pole includes a pole cover plate that covers the pole body, a liquid injection hole that can be communicated with the receiving groove is formed on the pole cover plate, and the battery cell also includes a sealing structure for sealing the liquid injection hole.

[0041] 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.

[0042] In a second aspect, an embodiment of the present application further provides a battery, comprising a battery cell of any of the above-mentioned solutions.

[0043] 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.

[0044] 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.

[0045] 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

[0046] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0047] Figure 1 A schematic diagram of the structure of a vehicle provided in some embodiments of the present application;

[0048] Figure 2 An exploded view of the structure of a battery provided in some embodiments of the present application;

[0049] Figure 3 A schematic diagram of the structure of a battery cell provided in some embodiments of the present application;

[0050] Figure 4 A schematic diagram of an orthographic projection of a battery cell provided in some embodiments of the present application;

[0051] Figure 5 For along Figure 4 Sectional view along line AA;

[0052] Figure 6 for Figure 5 A partial enlarged view of the B part circled in the middle;

[0053] Figure 7 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0054] Figure 8 for Figure 7 A partial enlarged view of the C section circled in the middle;

[0055] Fig. 9 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0056] Fig.10 A schematic diagram of the structure of the insulating sealing structure provided in some embodiments of the present application;

[0057] Fig.11 A schematic diagram of the structure of the insulating sealing structure provided in some other embodiments of the present application;

[0058] Fig.12 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0059] Fig.13 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0060] Fig.14 A partial cross-sectional view of a battery cell provided for some embodiments of the present application;

[0061] Fig.15 A schematic diagram of the cooperation between a battery cell and a busbar component provided in some embodiments of the present application.

[0062] Reference numerals: vehicle 1000; first direction X; second direction Y; third direction Z; battery 100; controller 200; motor 300; case 101; first case body 1011; second case body 1012; battery cell 102; current collecting component 103; housing 1; accommodating chamber 11; mounting hole 12; central axis L; first case wall 13; second corner 131; second case wall 14; pole 2; pole body 3; sink 31; first extension portion 32; penetration portion 33; first corner 34; first pole portion 35; Accommodating groove 36; connecting hole 37; second extension portion 38; second pole portion 39; pole cover plate 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

[0063] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0064] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0065] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0066] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0067] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0068] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0069] The term "plurality" used in the present application refers to two or more (including two).

[0070] In the present application, battery cells may include lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc., and the embodiments of the present application do not limit this. Battery cells may be cylindrical, flat, rectangular or other shapes, etc., and the embodiments of the present application do not limit this. Battery cells are generally divided into three types according to the packaging method: cylindrical battery cells, square battery cells and soft-pack battery cells, and the embodiments of the present application do not limit this.

[0071] The battery mentioned in the embodiments of the present application refers to a single physical module including one or more battery cells to provide higher voltage and capacity. For example, the battery mentioned in the present application may include a battery module or a battery pack. A battery module generally includes a plurality of battery cells. A battery pack generally includes a box for encapsulating one or more battery cells or one or more battery modules. The box can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0072] The battery cell includes a shell, a battery cell assembly and an electrolyte. The shell is used to contain the battery cell assembly and the electrolyte. The battery cell assembly includes at least one electrode assembly, which is composed of a positive electrode sheet, a negative electrode sheet and a separator. The electrode assembly can be a wound structure or a stacked structure. The battery cell mainly works by the movement of metal ions between the positive electrode sheet and the negative electrode sheet.

[0073] The positive electrode sheet can generally include a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is directly or indirectly coated on the positive electrode current collector, the positive electrode current collector not coated with the positive electrode active material layer protrudes from the positive electrode current collector coated with the positive electrode active material layer, and the positive electrode current collector not coated with the positive electrode active material layer serves as a positive electrode tab. Taking lithium-ion batteries as an example, the material of the positive electrode current collector can be aluminum, and the material of the positive electrode active material layer can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc.

[0074] The negative electrode sheet may generally include a negative electrode current collector and a negative electrode active material layer, wherein the negative electrode active material layer is directly or indirectly coated on the negative electrode current collector, and the negative electrode current collector not coated with the negative electrode active material layer protrudes from the negative electrode current collector coated with the negative electrode active material layer, and the negative electrode current collector not coated with the negative electrode active material layer serves as a negative electrode tab. The material of the negative electrode current collector may be copper, and the material of the negative electrode active material layer may be carbon or silicon, etc.

[0075] In order to ensure that a large current can pass without melting, the number of positive pole ears is multiple and stacked together to form the positive pole ear portion, and the number of negative pole ears is multiple and stacked together to form the negative pole ear portion. A pole column is provided on the shell, and the positive pole ear portion is electrically connected to the positive pole column, and the negative pole ear portion is electrically connected to the negative pole column. For example, the pole ear portion can be connected to the pole column to form a direct electrical connection between the pole ear portion and the pole column. For another example, the battery cell assembly may include a transfer plate, the pole ear portion is connected to the transfer plate, and the transfer plate is connected to the pole column to form an indirect electrical connection between the pole ear portion and the pole column.

[0076] The material of the isolation film is not limited, for example, it can be polypropylene or polyethylene.

[0077] In some battery cells in the related art, the pole is installed on the shell by riveting. In order to achieve insulation sealing between the shell and the pole, insulating plastic is usually arranged between the pole and the shell before riveting the pole. However, when riveting the pole, the pole will be deformed by force and squeeze the insulating plastic. The weak parts of the insulating plastic are prone to cracking due to force. Once the insulating plastic cracks, it will affect the reliability of the insulation sealing between the shell and the pole, resulting in a decrease in the reliability of the battery cell.

[0078] 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, the 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 outer side of the outer surface of the first shell wall or the inner side 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.

[0079] 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 insulating sealing structure is subjected to relatively large force at the position corresponding to the first corner and / or the second corner, and is prone to cracking at a weak position. By setting at least one of the first corner, the second corner, the third corner and the fourth corner to be chamfered, the force receiving 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.

[0080] The embodiment of the present application provides an electric device using a battery as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, such as a game console, an electric car toy, an electric ship toy, and an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, and a spacecraft, etc.

[0081] 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.

[0082] Please refer to Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery 100 is provided inside the vehicle 1000, and the battery 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery 100 may be used to power the vehicle 1000, for example, the battery 100 may be used as an operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 200 and a motor 300, and the controller 200 is used to control the battery 100 to power the motor 300, for example, for starting, navigating and driving the vehicle 1000.

[0083] In some embodiments of the present application, the battery 100 can not only serve as an operating power source for the vehicle 1000, but also serve as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0084] Please refer to Figure 2 , Figure 2An exploded view of the structure of a battery 100 provided for some embodiments of the present application. The battery 100 includes a case 101 and a plurality of battery cells 102, and the battery cells 102 are accommodated in the case 101. Among them, the case 101 is used to provide an assembly space for the battery cells 102, and the case 101 can adopt a variety of structures. In some embodiments, the case 101 may include a first case body 1011 and a second case body 1012, and the first case body 1011 and the second case body 1012 cover each other, and the first case body 1011 and the second case body 1012 jointly define an assembly space for accommodating the battery cells 102. The second box body 1012 may be a hollow structure with one end open, the first box body 1011 may be a plate-like structure, and the first box body 1011 covers the open side of the second box body 1012, so that the first box body 1011 and the second box body 1012 jointly define an assembly space; the first box body 1011 and the second box body 1012 may also be hollow structures with one side open, and the open side of the first box body 1011 covers the open side of the second box body 1012. Of course, the box body 101 formed by the first box body 1011 and the second box body 1012 may be in various shapes, such as a cylinder, a cuboid, etc.

[0085] In the battery 100, multiple battery cells 102 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that multiple battery cells 102 are connected in series and in parallel. Multiple battery cells 102 can be directly connected in series, in parallel, or in a hybrid connection, and then the whole formed by multiple battery cells 102 is accommodated in the box 101; of course, the battery 100 can also be a battery module formed by multiple battery cells 102 connected in series, in parallel, or in a hybrid connection, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole, and accommodated in the box 101. The battery 100 may also include other structures, for example, the battery 100 may also include a converging component for realizing electrical welding between multiple battery cells 102.

[0086] Each battery cell 102 may be a secondary battery or a primary battery; it may also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited thereto. The battery cell 102 may be cylindrical, flat, or rectangular. Figure 3 In the illustrated embodiment, the length direction of the battery cell 102 is the first direction X, the width direction of the battery cell 102 is the second direction Y, and the height direction of the battery cell 102 is the third direction Z. The first direction X, the second direction Y and the third direction Z are perpendicular to each other.

[0087] In some embodiments of the present application, Figure 3-Figure 6The battery cell 102 includes: a shell 1 and a pole 2, the pole 2 is arranged in the shell 1, and a receiving cavity 11 is formed inside the shell 1. Exemplarily, the battery cell 102 includes a battery cell assembly 7, and the battery cell assembly 7 may include an active material coating part 71 and a conductive part 72 connected to the active material coating part 71, the active material coating part 71 is received in the receiving cavity 11, and the conductive part 72 is welded to the pole 2, so that the conductive part 72 is electrically connected between the active material coating part 71 and the pole 2.

[0088] Combination Figure 5 and Figure 6 The housing 1 includes a first housing wall 13, and the first housing wall 13 has a mounting hole 12, and the pole 2 is penetrated 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, wherein the penetration portion 33 is penetrated through the mounting hole 12, that is, at least part of the penetration portion 33 is located in the mounting hole 12, and the axial direction of the mounting hole 12 is taken as the projection direction, and the plane perpendicular to the axial direction of the mounting hole 12 is taken as the projection plane, and the projection of the penetration portion 33 on the projection plane falls within the projection range of the mounting hole 12 on the projection plane, so that the penetration portion 33 can be penetrated through the mounting hole 12.

[0089] Combination Figure 5 and Figure 6 The first extension portion 32 is connected to the penetration portion 33 and extends relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12, and the first extension portion 32 extends to the outer side of the outer surface or the inner side of the inner surface of the first shell wall 13. The two side surfaces of the first shell wall 13 in the wall thickness direction are respectively the outer surface and the inner surface, the inner surface is the side surface of the first shell wall 13 facing the accommodating cavity 11, the outer surface is the side surface of the first shell wall 13 away from the accommodating cavity 11, the side of the outer surface away from the accommodating cavity 11 is the outer side of the outer surface, and the side of the inner surface facing the accommodating cavity 11 is the inner side of the inner surface. “The first extension portion 32 extends to the outside of the outer surface or the inside of the inner surface of the first shell wall 13” means that: at least a portion of the first extension portion 32 is opposite to the first shell wall 13, with the axial direction of the mounting hole 12 as the projection direction, and the surface perpendicular to the axial direction of the mounting hole 12 as the projection surface. The projection of the first extension portion 32 on the projection surface and the projection of the first shell wall 13 on the projection surface have an intersection area, and the portion of the first extension portion 32 corresponding to the intersection area is opposite to the first shell wall 13.

[0090] Combination Figure 5 and Figure 6 The battery cell 102 also includes an insulating sealing structure 8 that is fitted between the first shell wall 13 and the pole 2, that is, at least a portion of the insulating sealing structure 8 is sandwiched between the first shell wall 13 and the pole 2, so that the pole 2 and the first shell wall 13 are indirectly fitted through the insulating sealing structure 8, thereby achieving insulation and sealing between the first shell wall 13 and the pole 2.

[0091] like Figure 6 and Figure 7 As shown, 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, and 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 may be a rounded corner or a chamfered corner, which is not limited here.

[0092] 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.

[0093] 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.

[0094] In some embodiments of the present application, Figure 6 As shown, the pole 2 forms the first extension portion 32 by flanging and riveting. That is, after the pole 2 is assembled to the mounting hole 12 through the penetration portion 33, the first extension portion 32 is manufactured by the flanging and riveting process. As a result, the pole 2 is easy to process, and is conducive to improving the connection reliability between the first extension portion 32 and the penetration portion 33, and improving the assembly reliability between the pole 2 and the first shell wall 13.

[0095] Of course, the present application is not limited thereto. For example, in other embodiments of the present application, the pole 2 may also be formed by welding two parts together. For example, the two parts are respectively assembled to the mounting holes 12 and then the two parts are welded together.

[0096] In some embodiments, Figure 7 and Figure 8 As shown, 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.

[0097] When the pole 2 is assembled and fixed to the first shell wall 13, the first corner 34 is easy to squeeze the third corner 81, so that the insulating sealing structure 8 is cracked 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 and squeezing the position of the third corner 81, and reducing the risk of the insulating sealing structure 8 from the position of the third corner 81 cracking; 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 from the position of the third corner 81 cracking.

[0098] 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 being cracked at the position of the third corner 81 can be reduced.

[0099] In some embodiments of the present application, Figure 7 and Figure 8As shown, the first corner 34 and the third corner 81 are both formed as chamfers and the types of chamfers are the same. That is, the first corner 34 and the third corner 81 are both chamfered corners, or the first corner 34 and the third corner 81 are both rounded corners. Thus, when the first corner 34 and the third corner 81 are in contact, it is conducive to achieving surface contact between the first corner 34 and the third corner 81, thereby dispersing the force of the third corner 81 and improving the cracking problem of the third corner 81. When the first corner 34 and the third corner 81 are in clearance fit, it is conducive to improving the uniformity of the fit clearance between the first corner 34 and the third corner 81, thereby helping to reduce the extrusion of the first corner 34 on the third corner 81 and improve the cracking problem 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 can also be set to different types, for example, one of the first corner 34 and the third corner 81 is a chamfered corner and the other is a rounded corner.

[0100] For example, Figure 7 and Figure 8 As shown, the first corner 34 and the third corner 81 are both formed into rounded corners, and the rounded corner radius of the third corner 81 is larger than the rounded corner radius of the first corner 34. Therefore, processing the first corner 34 into a rounded corner shape is conducive to reducing 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 in a rounded corner shape. The third corner 81 is also processed into a rounded corner shape, and the rounded corner radius of the third corner 81 is set to be larger than the rounded corner radius of the first corner 34, so as to increase the matching clearance between the first corner 34 and the third corner 81, reduce the extrusion of the first corner 34 on the third corner 81, and thus reduce the risk of cracking of the insulating sealing structure 8 from the position of the third corner 81. In addition, processing the third corner 81 into a rounded corner shape is conducive to reducing the cracking problem of the insulating sealing structure 8 from the third corner 81 during processing, which is conducive to demoulding, etc.

[0101] In some embodiments of the present application, Figure 7 and Figure 8 As shown, regardless of whether at least one of the first corner 34 and the third corner 81 is processed into a chamfered form, a fitting gap can be 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 cracking of the insulating sealing structure 8 from the position of the third corner 81.

[0102] In some embodiments, Figure 7 and Figure 8As shown, 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 may be formed as a chamfer, and the fourth corner 82 may 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 may be formed as a chamfer, and the second corner 131 may 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 may be formed as chamfers.

[0103] 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 where the second corner 131 applies force to the fourth corner 82 can be increased, so that the force application position is dispersed, thereby reducing the force concentration and squeezing 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.

[0104] 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 being cracked at the position of the fourth corner 82 can be reduced.

[0105] In some embodiments of the present application, Figure 7 and Figure 8 As shown, the second corner 131 and the fourth corner 82 are both formed as chamfers and the types of chamfers 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 clearance between the second corner 131 and the fourth corner 82, thereby helping to reduce 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, such as in combination with Fig. 9 One of the second corner 131 and the fourth corner 82 is a chamfered corner, and the other is a rounded corner.

[0106] For example, Figure 7 and Figure 8As shown, the second corner 131 and the fourth corner 82 are both formed as chamfers. Therefore, processing the second corner 131 into a chamfer shape is conducive to reducing the processing difficulty of the first shell wall 13. Processing the fourth corner 82 into a chamfer shape is also conducive to improving the matching stability and matching compactness between the first shell wall 13 and the insulating sealing structure 8, and improving the insulating sealing effect.

[0107] In some embodiments of the present application, Figure 7 and Figure 8 As shown, 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 cracking of the insulating sealing structure 8 from the position of the fourth corner 82.

[0108] For example, Figure 7 and Figure 8 As shown, the third corner 81 and the fourth corner 82 are both formed as chamfers. Thus, by arranging 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 can be 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 difficulty of processing the first shell wall 13 and the pole 2.

[0109] For example, Figure 7 and Figure 8 As shown, the third corner 81 is a rounded corner, and the fourth corner 82 is a chamfered corner, so that the wall thickness of the insulating sealing structure 8 between the third corner 81 and the fourth corner 82 is sufficient to improve the local structural strength of the insulating sealing structure 8, further improve the cracking problem, and improve the reliability of the insulating seal. Alternatively, the fourth corner 82 can be set as a rounded corner, and the third corner 81 can be set as a chamfered corner. Alternatively, the third corner 81 and the fourth corner 82 can be both set as chamfered corners, or both can be set as rounded corners.

[0110] In addition, when the third corner 81 is formed as a chamfer, if the first corner 34 is set to be the same as the chamfer form of the third corner 81, the first corner 34 can also be formed as a chamfer, 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 in the form of a chamfer.

[0111] 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.

[0112] For example, Figure 8 As shown, 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 caused by the formation of the third corner 81 and the fourth corner 82.

[0113] 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 sufficient to improve the problem of cracking of the insulating sealing structure 8 due to insufficient local structural strength caused by the formation of the third corner 81 and the fourth corner 82.

[0114] 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 sufficient to improve the problem of cracking of the insulating sealing structure 8 due to insufficient local structural strength caused by the formation of the third corner 81 and the fourth corner 82.

[0115] like Figure 8 As shown, 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 defining the mounting hole 12. 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 member to affect sealing.

[0116] 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 Fig.10 As shown, the fourth corner 82 may be formed to be chamfered along the entire circumference of the insulating sealing structure 8; or in some embodiments, as shown in FIG. Fig.11 As shown, the fourth corner 82 may also be chamfered partially in the circumference of the insulating sealing structure 8, and the remaining positions may be right angles, acute angles, or obtuse angles. In addition, the chamfer types of the fourth corner 82 at different positions in the circumference of the insulating sealing structure 8 may be the same or different. For example, the fourth corner 82 may be chamfered over the entire circumference of the insulating sealing structure 8, or the fourth corner 82 may be chamfered over the entire circumference of the insulating sealing structure 8, or the fourth corner 82 may be chamfered at some positions in the circumference of the insulating sealing structure 8, and the remaining positions may be chamfered, and so on.

[0117] 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 throughout the circumference of the insulating sealing structure 8; or in some embodiments, the third corner 81 can also be chamfered partially in 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 throughout the circumference of the insulating sealing structure 8, or the third corner 81 can be chamfered throughout the 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.

[0118] Similarly, when the first corner 34 is formed as a chamfer, the chamfering form of the first corner 34 within the entire circumference can also be set as above. When the second corner 131 is formed as a chamfer, the chamfering form of the second corner 131 within the entire circumference can also be set as above.

[0119] In some embodiments, Fig.11 As shown, the insulating sealing structure 8 is formed into a racetrack shape (also called an oblong) surrounding the central axis L of the mounting hole 12. The racetrack shape is composed of a rectangle and an arc-shaped side located on the wide side of the rectangle. Fig.11 The position P shown in FIG. 1 is not prone to cracking, and the third corner 81 and the fourth corner 82 do not need to be chamfered at the corresponding connection position.

[0120] In some embodiments, Fig.11As shown, the insulating sealing structure 8 is formed into a racetrack shape (also called an oblong) surrounding the central axis L of the mounting hole 12, and the racetrack shape is composed of a rectangle and an arc edge located on the wide side of the rectangle. Among them, the arc edge can be chamfered, and the long side can be chamfered. Alternatively, the arc edge can be chamfered, and the long side can be chamfered. In this way, a variety of flexible designs can be achieved.

[0121] 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 damage to the insulating sealing structure 8, and protecting the insulating sealing structure 8.

[0122] In some embodiments, Fig.12 As shown, the insulating sealing structure 8 includes a first part 83 and a second part 84 integrated into one piece, for example Fig.12 As shown, the first part 83 and the second part 84 constitute a first insulating seal 85, and the first insulating seal 85 is an inseparable integral part. 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 near the third corner 81 relative to the second part 84, or the first part 83 includes a second sub-portion 832 arranged near the fourth corner 82 relative to the second part 84, or the first part 83 includes a first sub-portion 831 arranged near the third corner 81 relative to the second part 84 and a second sub-portion 832 arranged near the fourth corner 82 relative to the second part 84.

[0123] When the first portion 83 includes the first sub-portion 831, the material hardness of the first sub-portion 831 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. The insulating sealing structure 8 is subjected to relatively large force at the third corner 81 and is prone to cracking. By providing the first sub-portion 831 whose material hardness is softer than the second portion 84 at the third corner 81, the first sub-portion 831 is easily compressed and deformed when subjected to force, and absorbs the force, thereby reducing the risk of the insulating sealing structure 8 cracking at the third corner 81.

[0124] 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, 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, and 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, and it is easy to crack. By arranging the second sub-portion 832 with a material hardness softer than the second portion 84 at the fourth corner 82, the second sub-portion 832 is easily compressed and deformed by force, and absorbs the force, so that the risk of the insulating sealing structure 8 from the fourth corner 82 can be reduced.

[0125] It is worth noting that the materials of the first part 83 and the second part 84 are not limited and can be specifically selected according to actual requirements. For example, the material of the first part 83 can be selected from compressible rubber materials or plastic materials, such as PFA (perfluoroalkyl compound), PP (polypropylene), FKM (fluororubber), EPDM (ethylene propylene diene monomer rubber), etc., so that the first part 83 has good compression deformation performance to effectively improve the cracking problem. For example, the material of the second part 84 can be selected from insulating materials with higher hardness, such as PPS (polyphenylene sulfide, a new type of high-performance thermoplastic resin), or LCP (liquid crystal polymer), etc., so that the second part 84 has good hardness and plays a supporting role, so that the compression amount of the insulating sealing structure 8 can be better controlled and the sealing performance is improved.

[0126] It is worth noting that the first portion 83 may also include a first sub-portion 831 and a second sub-portion 832 at the same time, so as to more comprehensively reduce the risk of cracking of the insulating sealing structure 8 at a weak position and improve the structural reliability of the insulating sealing structure 8. In addition, 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 conditions.

[0127] In some embodiments of the present application, Fig. 9As shown, the insulating sealing structure 8 includes a first insulating sealing member 85 defining a third corner 81 and a fourth corner 82, wherein a first gasket 91 is provided between the first insulating sealing member 85 and the first extension portion 32. Thus, when the pole 2 is mounted on the first shell wall 13, when the first extension portion 32 presses the first insulating sealing member 85 in the direction of the first shell wall 13 (for example, presses the insulating sealing structure 8 along the axial direction of the mounting hole 12), since the first gasket 91 is provided between the first insulating sealing member 85 and the first extension portion 32, the first gasket 91 can reduce a part of the force, thereby reducing the force transmitted to the first insulating sealing member 85, thereby reducing the damage to the first insulating sealing member 85, and playing the effect of protecting the first insulating sealing member 85.

[0128] It is worth noting that the material hardness of the first gasket 91 and the material hardness of 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, thereby, the first gasket 91 can better attenuate the extrusion force transmitted to the first insulating seal 85, and more effectively improve the cracking problem of the first insulating seal 85. For example, the first insulating seal 85 can be a plastic part, and the first gasket 91 can be a metal part, so that the material hardness of the first gasket 91 can be greater than the material hardness of the first insulating seal 85. Exemplarily, the first gasket 91 can be made of steel, such as SUS304, SUS316, SPCC, etc., or aluminum, such as Al 1060, etc.

[0129] 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 corner 81 and the fourth corner 82.

[0130] In some embodiments of the present application, Fig. 9 As shown, the insulating sealing structure 8 includes a first insulating seal 85 defining a third corner 81 and a fourth corner 82, and a second gasket 92 is provided between the first insulating seal 85 and a side surface of the first shell wall 13 facing the first extension portion 32, and the material hardness of the second gasket 92 is less than the material hardness of the first insulating seal 85. For example, when the first extension portion 32 extends to the outside of the outer surface of the first shell wall 13, the second gasket 92 is arranged between the first extension portion 32 and the outer surface of the first shell wall 13, and for another example, when the first extension portion 32 extends to the inside of the inner surface of the first shell wall 13, the second gasket 92 is arranged between the first extension portion 32 and the inner surface of the first shell wall 13.

[0131] Therefore, when the pole 2 is installed on the first shell wall 13, when the pole 2 squeezes the first insulating seal 85 in the direction of 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 the damage to the first insulating seal 85, and protecting the first insulating seal 85.

[0132] 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.

[0133] Exemplarily, 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 better improving the cracking problem of the first insulating seal 85.

[0134] In some embodiments of the present application, Fig.13 As shown, the pole 2 also includes a second extension portion 38 connected to the penetration portion 33 and extending relative to the penetration portion 33 in a direction away from the central axis L of the mounting hole 12. The second extension portion 38 and the first extension portion 32 extend to the inner and outer sides of the first shell wall 13 respectively. 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 penetration portion 33 and the second extension portion 38 constitute a second pole portion 39. The insulating sealing structure 8 includes a second insulating seal 86 fitted between the second pole portion 39 and the first shell wall 13. The second insulating seal 86 is separately arranged from the first insulating seal 85. It can be understood that the first pole portion 35 and the second pole portion 39 share the penetration portion 33.

[0135] Therefore, 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 matching between the pole 2 and the first shell wall 13 can be more stable and reliable. 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 matching effect of the pole 2 and the first shell wall 13 at all locations.

[0136] In addition, in some embodiments, in combination Fig.13 , the insulating sealing structure 8 may also include a third insulating seal 87, which may be disposed between the second extension portion 38 and the shell 1 and abut the active material coating portion 71 of the battery cell assembly 7, thereby not only improving the insulation between the battery cell assembly 7 and the shell 1, but also improving the stability of the fit between the battery cell assembly 7 and the shell 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 sleeved at the end of the active material coating portion 71, and the insulating bracket abuts against the inner surface of the shell 1, thereby facilitating the protection of the battery cell assembly 7 when the battery cell assembly 7 is installed in the shell 1, avoiding the scratching between the shell 1 and the battery cell assembly 7, and improving the insulation between the battery cell assembly 7 and the shell 1, while improving the stability of the fit between the battery cell assembly 7 and the shell 1, thereby improving the reliability of the battery cell 102.

[0137] In some embodiments of the present application, Fig.13 As shown, 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.

[0138] 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 plate 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.

[0139] In some embodiments of the present application, Fig.13As shown, the first extension portion 32 protrudes from the penetration portion 33 toward the outside of the first shell wall 13 to define a recessed groove 31 between the first extension portion 32 and the penetration portion 33. The edge of the pole cover plate 4 is arranged in the recessed groove 31 and is penetrated and welded with the penetration portion 33. The welding structure formed by welding is separated from the first extension portion 32.

[0140] Therefore, the shrinkage stress generated by the solidification of the molten pool formed by welding can be blocked by the above-mentioned interval, and is difficult or less transmitted to the first extension portion 32, so that the warping problem of the first extension portion 32 can be improved, so that the first extension portion 32 can press the insulating sealing structure 8, and improve the insulating sealing effect. In addition, since the edge of the pole cover plate 4 is arranged in the sink 31 and is penetrated and welded with the penetration portion 33, rather than being butt-welded with the first extension portion 32, it is not necessary to ensure that the assembly gap between the edge of the pole cover plate 4 and the first extension portion 32 is small in order to meet the butt welding requirements, so that the interval between the edge of the pole cover plate 4 and the first extension portion 32 can be larger, thereby improving the compatibility of the pole body 3, which is conducive to reducing the processing accuracy of the pole cover plate 4 and the pole body 3.

[0141] In some embodiments of the present application, Fig.13 As shown, the battery cell 102 is formed with a receiving cavity 11 on the inner side of the first shell wall 13, and the pole 2 includes a pole body 3, on which a receiving groove 36 is formed, which is open in a direction away from the receiving cavity 11, and the pole body 3 has a connecting hole 37, which penetrates the groove wall of the receiving groove 36 on one side close to the receiving cavity 11, and connects the receiving cavity 11 with the receiving groove 36. For example, when the penetration portion 33 is annular, the receiving groove 36 is located in the inner ring area of ​​the penetration portion 33, and for example, the receiving groove 36 can be jointly defined by the penetration portion 33 and the support portion located in the inner ring area of ​​the penetration portion 33, and the connecting hole 37 penetrates the support portion.

[0142] Thus, when injecting electrolyte into the battery cell 102, the electrolyte can be injected into the receiving groove 36, and then flow toward the receiving cavity 11 through the connecting hole 37, wherein the receiving groove 36 can play the role of buffering the electrolyte to improve the problems of electrolyte splashing and overflow. Moreover, the side wall of the receiving groove 36 (i.e., the groove wall extending from the notch of the receiving groove 36 toward the receiving cavity 11) can block the electrolyte from splashing to a certain extent, reduce the pollution caused by the electrolyte to the outside, and facilitate rapid injection. Moreover, since there is no need to open a separate injection channel on the shell 1, there is no need to perform special processing on the shell 1, which is conducive to reducing the structural complexity and processing difficulty of the shell 1.

[0143] For example, Fig.13As shown, the side of the sinking groove 31 facing the central axis L of the mounting hole 12 is open to communicate with the receiving groove 36. Thus, the compactness of the matching between the pole body 3 and the pole cover 4 can be improved, and the structure and processing of the pole cover 4 can be simplified.

[0144] In some embodiments of the present application, Fig.13 As shown, the battery cell 102 includes a cell assembly 7, which includes an active material coating portion 71 received in the receiving cavity 11, and a conductive portion 72 connected to the active material coating portion 71, and the conductive portion 72 is penetrated through the connecting hole 37 to be at least partially received in the receiving groove 36.

[0145] 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. Exemplarily, at least one communicating hole 37 can pass electrolyte, for example, at least one communicating hole 37 is vacant (i.e., the conductive portion 72 is not provided), so that the electrolyte can pass through without being hindered by the conductive portion 72, and for another example, at least one communicating hole 37 can still pass electrolyte after the conductive portion 72 is provided.

[0146] Therefore, by accommodating at least a portion of the conductive part 72 in the receiving groove 36, at least a portion of the conductive part 72 occupies the space in the receiving groove 36, thereby reducing the space occupied by the conductive part 72 in the receiving cavity 11, saving space in the receiving cavity 11 to accommodate a larger volume of the active material coating part 71, which is beneficial to improving the energy density of the battery cell 102, or when the energy density of the battery cell 102 remains unchanged, it is beneficial to reduce the size of the battery cell 102.

[0147] It is understandable that the active material coating portion 71 may include a current collector coated with an active material layer, and the conductive portion 72 may include only a pole ear portion, or may include a pole ear portion and a transition piece electrically connected to the pole ear portion, etc., which is not limited here.

[0148] In some embodiments, the conductive portion 72 is welded to the pole body 3 to form an electrical connection, thereby realizing the output of the battery cell assembly 7 from the electrode at the pole body 3. Fig.13 As shown, the conductive portion 72 is welded to the side wall of the accommodating groove 36 close to the accommodating cavity 11, thereby improving the compactness of the fit and facilitating the welding operation of the two. Of course, the present application is not limited thereto, and in other embodiments, the conductive portion 72 may also be configured to be welded to the pole cover plate 4 to form an electrical connection, which is not limited here.

[0149] In some embodiments of the present application, Fig.14As shown, the pole 2 includes a pole cover plate 4 covering the pole body 3 , and a liquid injection hole 43 which can be communicated with the receiving groove 36 is formed on the pole cover plate 4 . The battery cell 102 also includes a sealing structure 6 for sealing the liquid injection hole 43 .

[0150] In this way, when electrolyte needs to be injected into the battery cell 102, the sealing structure 6 is not installed at the injection hole 43 first, or the sealing structure 6 is in a state of opening the injection hole 43, and the electrolyte can be injected into the receiving groove 36 through the injection hole 43. After the injection, the sealing structure 6 can be installed at the injection hole 43, or the sealing structure 6 can be switched to a state of closing the injection hole 43, so as to seal and close the injection hole 43 to prevent the electrolyte from overflowing and prevent foreign matter from entering the receiving cavity 11 from the injection hole 43, thereby improving the reliability of the battery cell 102.

[0151] Therefore, by processing the injection hole 43 on the pole cover 4, the opening is relatively small and located outside, and the injection inlet can be reliably sealed more easily through the sealing structure 6, thereby improving the working reliability of the battery cell 102 and realizing flexible and diversified design of the sealing structure 6.

[0152] In some embodiments, Fig.14 As shown, the pole cover plate 4 does not have a portion that stops at the outside of the sealing structure 6 (i.e., the side away from the accommodating cavity 11), so that the sealing structure 6 is suitable for being installed to the pole cover plate 4 from the outside of the pole cover plate 4 (i.e., the side away from the accommodating cavity 11). In this way, by setting the sealing structure 6 to be installed to the pole cover plate 4 from the outside of the pole cover plate 4 to seal the injection hole 43, the sealing structure 6 is installed after the injection, which can ensure the sealing of the injection hole 43, and the installation position is close to the outside, which is convenient for the rapid assembly of the sealing structure 6. Moreover, the installation of the sealing structure 6 will not have an adverse effect on the connection between the pole body 3 and the pole cover plate 4, ensuring the reliability of the connection between the pole cover plate 4 and the pole body 3.

[0153] The sealing structure 6 can be in a detachable form or in a non-detachable fixed form. For example, when the sealing structure 6 is in a detachable form, it is convenient for maintaining the injection hole 43. For example, when 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 and injected 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 plate 4 by means of threads or screws, so as to facilitate disassembly and assembly.

[0154] Exemplarily, when the sealing structure 6 is in a non-detachable fixed form, the sealing structure 6 can be fixed to the pole cover 4 by welding, riveting, etc., so as to improve the sealing reliability of the sealing structure 6 to the injection hole 43. For example, the injection hole 43 can be in a multi-section form, and the sealing structure 6 can include a first sealing member 61 that is interference fit with the injection hole 43, and a second sealing member 62 that covers the first sealing member 61 and is welded to the pole cover 4.

[0155] Alternatively, in some embodiments, the second sealing member 62 may be configured to be detachably connected to the pole cover plate 4 by means of a screw-on, so as to restrict the first sealing member 61 to a position where it is interference-fitted with the injection hole 43 .

[0156] In some embodiments of the present application, Fig.14 As shown, at least part of the sealing structure 6 is embedded in the injection hole 43. That is, the sealing structure 6 can be fully embedded in the injection hole 43, or only part of the sealing structure 6 can be embedded in the injection hole 43. Thus, on the one hand, the space in the injection hole 43 can be fully utilized to improve the sealing reliability of the sealing structure 6 to the injection hole 43, and on the other hand, the height of the sealing structure 6 protruding outside the injection hole 43 can be reduced, and the space occupied by the sealing structure 6 outside the pole cover 4 can be reduced, which is conducive to reducing the interference effect on the converging component 103, increasing the connection area between the converging component 103 and the pole cover 4, and improving the flow efficiency.

[0157] In some embodiments of the present application, Fig.14 As shown, the first shell wall 13 is an integrally formed cover plate, or, as shown in Fig.13 As shown, the housing 1 also includes a second housing wall 14, the first housing wall 13 and at least one second housing wall 14 are integrally formed, and the second housing wall 14 extends toward one side in the thickness direction of the first housing wall 13. Thus, the structural position of the pole 2 can be flexibly designed, thereby increasing the applicable scope of the battery cell 102 of the embodiment of the present application.

[0158] It is worth noting that the second shell wall 14 can extend from the edge of the first shell wall 13. When the first shell wall 13 is rectangular, at least one of the four edges of the first shell wall 13 can extend the second shell wall 14. For example, only one edge of the first shell wall 13 extends from the second shell wall 14. The first shell wall 13 can also have only two edges that extend from the second shell wall 14 respectively. The first shell wall 13 can also have three edges that extend from the second shell wall 14 respectively. The first shell wall 13 can also have four edges that extend from the second shell wall 14. Exemplarily, when the shell 1 is a rectangular shell, any wall surface of the rectangular shell can serve as the first shell wall 13.

[0159] 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.

[0160] According to the second aspect of the present application, the present application also provides a battery 100, including a battery cell 102 of any of the above solutions. It is worth noting that the battery 100 according to the embodiment of the present application may include a box body or may not include a box body. Therefore, since the reliability of the battery cell 102 according to the embodiment of the present application is improved, it is beneficial to improve the performance of the battery 100.

[0161] For example, Fig.15 As shown, the battery 100 may further include a busbar 103, and there are multiple battery cells 102, and at least two of them are electrically connected through the busbar 103. In this way, multiple battery cells 102 can be connected in series and / or in parallel. For example, when multiple battery cells 102 are connected in series, the pole cover plate 4 of the anode of one battery cell 102 is connected to the pole cover plate 4 of the cathode of the next battery cell 102 through a busbar 103, and at the same time, the pole cover plate 4 of the cathode of the battery cell 102 is connected to the pole cover plate 4 of the anode of the previous battery cell 102 through another busbar 103.

[0162] According to the third aspect of the present application, the present application also provides an electric device, including the battery 100 of any of the above solutions, and the battery 100 is used to provide power to the electric device. The electric device can be any of the above-mentioned devices or systems using the battery 100. Since the performance of the battery 100 is improved, it is beneficial to improve the working power performance of the electric device.

[0163] Next, a battery cell 102 according to a specific embodiment of the present application is described.

[0164] The battery cell 102 includes a shell 1, a pole 2 and an insulating sealing structure 8. The shell 1 includes a first shell wall 13, which has a mounting hole 12. The pole 2 includes a penetration portion 33 that penetrates the mounting hole 12, a first extension portion 32 that 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, and a second extension portion 38 that 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 of the first shell wall 13, and the second extension portion 38 extends to the inside of the inner surface of the first shell wall 13. The pole 2 forms the first extension portion 32 by riveting the flanging.

[0165] 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.

[0166] The connection between the first extension portion 32 and the penetration portion 33 has a first corner 34 disposed toward the first shell wall 13, the first shell wall 13 includes a second corner 131 disposed corresponding to the first corner 34, and the first insulating seal 85 includes a third corner 81 disposed corresponding to the first corner 34, 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.

[0167] 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 of the first insulating seal 85 corresponding to the first corner 34 and / or the second corner 131 is relatively concentrated, and the weak position 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 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.

[0168] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application may be combined with each other.

[0169] The above are only preferred embodiments of the present application and are not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A battery cell, characterized in that: include: A first shell wall, 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, characterized in that: At least one of the first corner and the third corner is formed as a chamfer.

3. The battery cell according to claim 2, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: At least one of the second corner and the fourth corner is formed as a chamfer.

7. The battery cell according to claim 6, characterized in that: 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, characterized in that: 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, characterized in that: The third corner and the fourth corner are both formed as chamfers, and 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: 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, characterized in that: The pole also includes a second extension portion connected to the penetration portion and extending relative to the penetration portion in a direction away from the central axis of the mounting hole, the second extension portion and the first extension portion extend to the inner and outer sides of the first shell wall respectively, the 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, characterized in that: 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, characterized in that: The first extension portion protrudes from the penetration portion toward the outer side of the first shell wall to define a recessed groove between the first extension portion and the penetration portion. The edge of the pole cover plate is arranged in the recessed groove and is penetrated and welded with the penetration portion. The welding structure formed by welding is spaced apart from the first extension portion.

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

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

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

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

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

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