Battery monomer, battery and electric equipment

Abstract

The utility model discloses a battery monomer, a battery and electric equipment. The battery monomer comprises a shell and an end cover, at least two side walls of the shell are unequal in thickness, the shell is provided with a first side wall in the first direction, an opening is formed in at least one end of the shell in the second direction, the second direction is perpendicular to the first direction, and the end cover covers the opening. Wherein the end cover is provided with a positioning part, and the first side wall is provided with a matching part matched with the positioning part. The positioning part and the matching part are used as fool-proof structures, so that the possibility that the end cover is assembled relative to the shell in a wrong direction can be reduced, and the assembly quality and the assembly efficiency of the battery monomer are 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] With the development of new energy technology, batteries are being used more and more widely. Batteries have high energy density, high safety, long service life, and are green and environmentally friendly to the social environment. They have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery swap stations, engineering manufacturing, smart equipment, etc. At the same time, they also promote technical development and research in communications, medical equipment, energy development, etc.

[0003] In the battery production process, how to improve the assembly quality and efficiency of battery cells is a technical problem that needs to be solved urgently. Utility Model Content

[0004] The embodiments of the present application provide a battery cell, a battery, and an electrical device, which can effectively improve the assembly quality and efficiency of the battery cell.

[0005] In a first aspect, an embodiment of the present application provides a battery cell, the battery cell comprising a shell and an end cover: at least two side walls of the shell have different thicknesses, the shell has a first side wall in a first direction, at least one end of the shell forms an opening along a second direction, and the second direction is perpendicular to the first direction; the end cover covers the opening;

[0006] Wherein, the end cover is provided with a positioning portion, and the first side wall is provided with a matching portion matching with the positioning portion.

[0007] In the above technical solution, the positioning portion and the matching portion serve as foolproof structures, which can reduce the possibility of the end cover being assembled in the wrong direction relative to the shell, and improve the assembly quality and efficiency of the battery cell.

[0008] In some embodiments, one of the positioning portion and the matching portion is a protrusion, and the other is a groove, and at least a portion of the protrusion is accommodated in the groove.

[0009] In the above technical solution, one of the positioning portion and the matching portion is a protrusion, and the other is a groove. This fool-proof structure is simple in construction and can reduce the difficulty of preparing the shell and the end cover.

[0010] In some embodiments, the protrusion and the groove are loosely matched.

[0011] In the above technical solution, a part of the protrusion can be easily accommodated in the groove, reducing the risk of interference between the protrusion and the groove.

[0012] In some embodiments, the positioning portion is a protrusion, and the matching portion is a groove.

[0013] In the above technical solution, the positioning portion is a protrusion, and providing the protrusion on the end cover can improve the structural strength of the end cover.

[0014] In some embodiments, along the first direction, the size of the protrusion is L1, satisfying 0.3mm≤L1≤1mm; and / or, along the third direction, the size of the protrusion is L2, satisfying 0.3mm≤L2≤1mm; and / or, along the second direction, the size of the protrusion is L3, satisfying 0.3mm≤L3≤2.5mm, and the first direction, the second direction and the third direction are perpendicular to each other.

[0015] In the above technical solution, 0.3mm≤L1≤1mm, along the first direction, the size of the protrusion is not too large, the space occupied is small, and the size of the protrusion is not too small, which can be used to prevent foolishness during the assembly of the end cap and the shell. 0.3mm≤L2≤1mm, along the third direction, the size of the protrusion is not too large, the space occupied is small, and the size of the protrusion is not too small, which can be used to prevent foolishness during the assembly of the end cap and the shell. 0.3mm≤L3≤2.5mm, along the second direction, the size of the protrusion is not too high, the space occupied is small, and the size of the protrusion is not too small, which can be used to prevent foolishness during the assembly of the end cap and the shell.

[0016] In some embodiments, the end cover includes a body and a boss, the boss is arranged on a side of the body facing the interior of the battery cell, the positioning portion is arranged on an outer peripheral surface of the boss, and the matching portion is arranged on an inner surface of the first side wall.

[0017] In the above technical solution, the positioning portion is arranged on the outer peripheral surface of the boss, which facilitates the positioning portion to cooperate with the matching portion on the inner surface of the first side wall, and the arrangement of the positioning portion and the matching portion does not affect the consistency of the external interface of the battery cell.

[0018] In some embodiments, the first side wall has a first end surface, the first end surface connects the inner surface and the outer surface of the first side wall, the matching portion extends to the first end surface, and the body abuts against the first end surface.

[0019] In the above technical solution, the matching portion extends to the first end surface, which can greatly reduce the difficulty of matching the positioning portion with the matching portion. The abutment between the matching portion body and the first end surface can greatly improve the assembly stability of the end cover and the housing.

[0020] In some embodiments, the shell further has a second side wall disposed opposite to the first side wall in the first direction, and the thickness of the first side wall is not equal to the thickness of the second side wall.

[0021] In the above technical solution, the first side wall and the second side wall are designed with different thicknesses, so that the side walls corresponding to the areas with high strength requirements can be of larger thickness to improve the structural strength of the battery cell, and the side walls corresponding to the areas with lower strength requirements can be of smaller thickness to reduce the space occupied by the side walls, thereby providing a larger storage space for the electrode assemblies inside the battery cell.

[0022] In some embodiments, the thickness of the first sidewall is greater than the thickness of the second sidewall.

[0023] In the above technical solution, the thickness of the first side wall is relatively large, and the structural strength is higher; the matching portion is located on the first side wall, and has little effect on the structural strength of the shell.

[0024] In some embodiments, the battery cell further includes a pressure relief mechanism, and the pressure relief mechanism is disposed on the thicker one of the first side wall and the second side wall.

[0025] In the above technical solution, the pressure relief mechanism is arranged on the thicker one of the first side wall and the second side wall, that is, the pressure relief mechanism is arranged on the side wall with higher strength between the first side wall and the second side wall, and the side wall with higher strength can provide stronger structural support for the pressure relief mechanism.

[0026] In some embodiments, the shell has a third side wall and a fourth side wall arranged opposite to each other along the third direction, the thickness of the third side wall is not equal to the thickness of the fourth side wall, and the first direction, the second direction and the third direction are perpendicular to each other.

[0027] In the above technical solution, the third side wall and the fourth side wall are designed with unequal thickness, so that the side wall corresponding to the area with high strength requirements can be thicker to improve the structural strength of the battery cell, and the side wall corresponding to the area with low strength requirements can be thinner to reduce the space occupied by the side wall, providing more storage space for the electrode assembly inside the battery cell. The positioning part and the matching part serve as foolproof structures, which can reduce the possibility of the end cover being assembled in the wrong direction relative to the third side wall and the fourth side wall.

[0028] In some embodiments, the shell also has a second side wall arranged opposite to the first side wall in the first direction, and has a third side wall and a fourth side wall arranged opposite to each other in the third direction, the outer surface areas of the third side wall and the fourth side wall are both larger than the outer surface areas of the first side wall and the second side wall, and the first direction, the second direction and the third direction are perpendicular to each other.

[0029] In the above technical solution, the third side wall and the fourth side wall are the two side walls with larger areas in the shell, and the first side wall and the second side wall are the two side walls with smaller areas in the shell. The thickness of the side walls of the shell is inconsistent, and high requirements are placed on the correct assembly direction of the end cover relative to the shell. By setting up the fool-proof structure such as the positioning part and the matching part, the possibility of the end cover being assembled in the wrong direction relative to the shell can be reduced to a great extent.

[0030] In some embodiments, the shell also has a second side wall arranged opposite to the first side wall in the first direction, and the shell has a third side wall and a fourth side wall arranged opposite to each other in the third direction, the outer surface areas of the first side wall and the second side wall are both larger than the outer surface areas of the third side wall and the fourth side wall, and the first direction, the second direction and the third direction are perpendicular to each other.

[0031] In the above technical solution, the third side wall and the fourth side wall are the two side walls with smaller areas in the shell, and the first side wall and the second side wall are the two side walls with larger areas in the shell. The thickness of the side walls of the shell is inconsistent, and high requirements are placed on the correct assembly direction of the end cover relative to the shell. By setting up the fool-proof structure such as the positioning part and the matching part, the possibility of the end cover being assembled in the wrong direction relative to the shell can be reduced to a great extent.

[0032] In some embodiments, the end cap is welded to the housing.

[0033] In the above technical solution, welding the end cap to the shell can improve the connection stability between the end cap and the shell. By setting the foolproof structure of the positioning part on the end cap and the matching part on the shell, the risk of the end cap and the shell being assembled in the wrong direction, resulting in a poor weld or difficulty in welding, can be reduced to a large extent.

[0034] In some embodiments, the shell is respectively formed with the openings at both ends along the second direction, and the two end covers are respectively covered with the two openings; the battery cell also includes a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are respectively arranged on the two end covers.

[0035] In some embodiments, the battery cell further includes a first electrode terminal and a second electrode terminal, and along the second direction, the first electrode terminal and the second electrode terminal are both disposed on the same side of the end cap.

[0036] In the above technical solution, the first electrode terminal and the second electrode terminal are located on the same side of the end cover, which facilitates the current to be drawn out from the same side of the battery cell.

[0037] In a second aspect, an embodiment of the present application provides a battery, the battery comprising a battery cell provided by any embodiment of the first aspect.

[0038] In a third aspect, an embodiment of the present application provides an electrical device, which includes a battery cell provided by any embodiment of the first aspect or a battery provided by any embodiment of the second aspect, and the battery cell or the battery is used to power the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] 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.

[0040] Figure 1 A schematic diagram of the structure of a vehicle according to some embodiments of the present application;

[0041] Figure 2 An exploded schematic diagram of a battery according to some embodiments of the present application;

[0042] Figure 3 A schematic diagram of the structure of a battery cell in some embodiments of the present application;

[0043] Figure 4 An exploded schematic diagram of a battery cell according to some embodiments of the present application;

[0044] Figure 5 A schematic structural diagram of an end cap assembly from one perspective of some embodiments of the present application;

[0045] Figure 6 A schematic structural diagram of an end cap assembly from another perspective of some embodiments of the present application;

[0046] Figure 7 A partial cross-sectional view of a battery cell according to some embodiments of the present application;

[0047] Figure 8 for Figure 7 Enlarged view of the middle C part;

[0048] Fig. 9 for Figure 6 Enlarged view of middle part B;

[0049] Fig.10 for Figure 4 Enlarged view of part A in the middle;

[0050] Fig.11 It is a partial structural schematic diagram of the end cover of some embodiments of the present application;

[0051] Fig.12 This is a schematic diagram of the housing structure of some embodiments of the present application;

[0052] Fig.13 It is a schematic diagram of the structure of the housing of some other embodiments of the present application;

[0053] Fig.14 Schematic diagram of the structure of the shell of some other embodiments of the present application.

[0054] Icons: 100-battery; 10-battery cell; 11-end cover; 111-positioning portion; 112-body; 113-boss; 1131-guide slope; 12-housing; 12a-first side wall; 1211-inner surface of the first side wall; 1212-outer surface of the first side wall; 1213-first end surface; 12b-second side wall; 12c-third side wall; 12d-fourth side wall; 121-opening; 122-matching 1-joint; 13-electrode assembly; 14-pressure relief mechanism; 15-electrode terminal; 15a-first electrode terminal; 15b-second electrode terminal; 16-first insulating member; 17-rivet block; 18-second insulating member; 20-housing; 21-first part; 22-second part; 23-accommodating space; 1000-vehicle; 200-motor; 300-controller; X-first direction; Z-second direction; Y-third direction.

[0055] The drawings are not drawn to scale. DETAILED DESCRIPTION

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] In the description of the present application, it should be noted that, unless otherwise specified, "multiple" means more than two; the terms "upper", "lower", "left", "right", "inside", "outside", etc., indicating the orientation or positional relationship, are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but is within the allowable error range. "Parallel" is not strictly parallel, but is within the allowable error range.

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

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

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

[0064] In the present application, battery cells may include but are not limited to lithium-ion secondary batteries, lithium-ion primary batteries, lithium-sulfur batteries, sodium-lithium-ion batteries, sodium-ion batteries or magnesium-ion batteries, etc. Battery cells include but are not limited to flat bodies, rectangular parallelepiped bodies or other shapes, etc. Battery cells generally include cylindrical battery cells, square battery cells, etc. according to the packaging method.

[0065] A battery cell includes an electrode assembly and an electrolyte. The electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. A battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work. Metal ions (such as lithium ions) are embedded and removed between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive electrode sheet and the negative electrode sheet from short-circuiting, while allowing active ions to pass through.

[0066] The positive electrode sheet includes a positive electrode collector and a positive electrode active material layer. The positive electrode active material layer is coated on the surface of the positive electrode collector. The positive electrode collector not coated with the positive electrode active material layer protrudes from the positive electrode collector coated with the positive electrode active material layer. The positive electrode collector not coated with the positive electrode active material layer serves as a positive electrode ear.

[0067] Taking lithium-ion batteries as an example, the positive electrode active material can be lithium cobalt oxide, lithium iron phosphate, ternary lithium or lithium manganese oxide, etc. The positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium, etc. can be used. The composite current collector may include a polymer material base and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0068] The negative electrode sheet includes a negative electrode collector and a negative electrode active material layer. The negative electrode active material layer is coated on the surface of the negative electrode collector. The negative electrode collector not coated with the negative electrode active material layer protrudes from the negative electrode collector coated with the negative electrode active material layer. The negative electrode collector not coated with the negative electrode active material layer serves as a negative electrode tab.

[0069] The negative electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, carbon electrode, carbon, nickel or titanium may be used. The negative electrode active material may be carbon or silicon.

[0070] In order to ensure that a large current does not melt, the number of positive electrode tabs is multiple and stacked together, and the number of negative electrode tabs is multiple and stacked together. The material of the separator can be PP (polypropylene) or PE (polyethylene). In addition, the electrode assembly can be a winding structure or a laminated structure.

[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. The battery generally includes a box for encapsulating one or more battery cells. The box can reduce the impact of liquid or other foreign matter on the charging or discharging of the battery cells.

[0072] In some embodiments, the battery may be a battery module. When there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0073] In some embodiments, the battery may be a battery pack, which includes a case and battery cells, wherein the battery cells or battery modules are accommodated in the case.

[0074] In some embodiments, multiple battery cells may be first integrated into at least one battery module, and then the battery module may be installed in a box to form a battery pack. In this embodiment, auxiliary structural members such as beams may be provided between the battery modules to improve the installation stability of the battery module in the box.

[0075] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0076] In some embodiments, the battery may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0077] In battery cell technology, the end cap is fitted to the opening of the shell to form the external structure of the battery cell. The wrong assembly direction of the end cap relative to the shell will affect the assembly quality and efficiency of the battery cell. Especially in the structure of the shell sidewalls with unequal thickness, the wrong assembly direction of the end cap will lead to low consistency between the end cap and the external interface of the shell (cannot be aligned), resulting in poor welding or difficulty in welding the end cap and the shell.

[0078] In view of this, in order to solve the problem that the end cover is assembled in the wrong direction relative to the shell, resulting in reduced assembly quality and assembly efficiency of the battery cell, the embodiment of the present application provides a technical solution, in which a positioning portion is provided on the end cover, and a matching portion is provided on the shell, and the positioning portion and the matching portion serve as anti-mistake structures. Through the cooperation of the positioning portion and the matching portion, the possibility of the end cover being assembled in the wrong direction relative to the shell can be reduced, thereby improving the assembly quality and assembly efficiency of the battery cell.

[0079] The technical solutions disclosed in the embodiments of the present application are applicable to but not limited to batteries and electrical equipment using batteries.

[0080] Electrical equipment can be vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys and electric tools, etc. Vehicles can be fuel vehicles, gas vehicles or new energy vehicles. New energy vehicles can be pure electric vehicles, hybrid vehicles or extended-range vehicles, etc. Spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers, etc.

[0081] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0082] Please refer to Figure 1 , Figure 1 1 is a schematic diagram of the structure of a vehicle 1000 according to some embodiments of the present application. A battery 100 is disposed inside the vehicle 1000. The battery 100 may be disposed 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.

[0083] The vehicle 1000 may further include a controller 300 and a motor 200 , wherein the controller 300 is used to control the battery 100 to supply power to the motor 200 , for example, to meet the power requirements of starting, navigating, and driving the vehicle 1000 .

[0084] 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.

[0085] In some embodiments, please refer to Figure 2 , Figure 2The battery 100 of some embodiments of the present application is an exploded schematic diagram, and the battery 100 includes a plurality of battery cells 10. The plurality of battery cells 10 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the plurality of battery cells 10 are connected in series and in parallel.

[0086] In some embodiments, the battery 100 may further include a busbar component (not shown), and the multiple battery cells 10 may be electrically connected via the busbar component to achieve series connection, parallel connection, or mixed connection of the multiple battery cells 10 .

[0087] The busbar component may be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0088] In some embodiments, the battery 100 may further include a box 20, which is used to accommodate the battery cell 10. The box 20 may include a first portion 21 and a second portion 22, which cover each other to define an accommodating space 23 for accommodating the battery cell 10. Of course, the connection between the first portion 21 and the second portion 22 may be sealed by a sealing element (not shown), which may be a sealing ring, a sealant, etc.

[0089] The first part 21 and the second part 22 may be in various shapes. The first part 21 may be a hollow structure with one side open, and the second part 22 may be a hollow structure with one side open, and the open side of the second part 22 covers the open side of the first part 21, thereby forming a box body 20 with a receiving space 23. Of course, the first part 21 may be a hollow structure with one side open, and the second part 22 may be a plate-shaped structure, and the second part 22 covers the open side of the first part 21, thereby forming a box body 20 with a receiving space 23.

[0090] Please refer to Figure 3 and Figure 4 , Figure 3 A schematic diagram of the structure of a battery cell 10 according to some embodiments of the present application; Figure 4 The exploded schematic diagram of the battery cell 10 of some embodiments of the present application. The battery cell 10 may include a housing 12, an electrode assembly 13, an end cap 11, an electrode terminal 15 and other functional components.

[0091] The shell 12 is a component for accommodating the electrode assembly 13. The shell 12 may be a hollow structure with an opening 121 formed at one end, or a hollow structure with openings 121 at both ends. The shell 12 may be made of a variety of materials, such as copper, iron, aluminum, steel, aluminum alloy, etc. The shell 12 may be in a variety of shapes. For example, in Figure 3 In the embodiment, the housing 12 is a rectangular parallelepiped.

[0092] The end cap 11 is a component that covers the opening 121 of the shell 12 to isolate the internal environment of the battery cell 10 from the external environment. The end cap 11 covers the opening 121 of the shell 12, and the end cap 11 and the shell 12 together define a sealed space for accommodating the electrode assembly 13, electrolyte and other functional components. The shape of the end cap 11 can be adapted to the shape of the shell 12. For example, the shell 12 is a rectangular parallelepiped structure, and the end cap 11 is a rectangular plate structure adapted to the shell 12. The material of the end cap 11 can also be various. Exemplarily, the end cap 11 can be a metal material, such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cap 11 can be the same as or different from the material of the shell 12.

[0093] In the battery cell 10, there can be one or two end caps 11. If the shell 12 is a hollow structure with an opening 121 formed at one end, one end cap 11 is provided accordingly; if the shell 12 is a hollow structure with openings 121 formed at both ends, two end caps 11 are provided accordingly, and the two end caps 11 cover the two openings 121 of the shell 12 respectively.

[0094] Figure 5 A schematic structural diagram of an end cap assembly from one perspective of some embodiments of the present application; Figure 6 This is a schematic structural diagram of the end cover assembly from another perspective of some embodiments of the present application.

[0095] Reference Figure 5 and Figure 6 The electrode terminal 15 is a component for extracting the current from the battery cell 10. Two electrode terminals 15 can be provided, one is a positive terminal and the other is a negative terminal. If one end cap 11 is provided, the two electrode terminals 15 can be provided on the same end cap 11. If two end caps 11 are provided, the two electrode terminals 15 can be provided on two end caps 11 respectively.

[0096] Reference Figure 5 In some embodiments, the battery cell 10 may further include a rivet block 17, which is disposed on the end cover 11, fixed to the end cover 11, and the electrode terminal 15 is riveted to the rivet block 17. The material of the rivet block 17 includes but is not limited to aluminum, copper, steel, and alloys thereof.

[0097] Reference Figure 5 In some embodiments, the battery cell 10 may further include a first insulating member 16, which is disposed between the end cover 11 and the rivet block 17 and surrounds the rivet block 17. The first insulating member 16 may be a plastic member, a rubber member, etc. Optionally, the first insulating member 16 is an upper plastic.

[0098] Reference Figure 6In some embodiments, the battery cell 10 may further include a second insulating member 18, which is disposed on the inner surface of the end cap 11 to insulate the end cap 11 from other components inside the battery cell 10. The inner surface of the end cap 11 is the side of the end cap 11 facing the inside of the battery cell 10. The second insulating member 18 may be a plastic member, a rubber member, etc. Optionally, the second insulating member 18 is a lower plastic.

[0099] The end cover 11 and the functional components disposed on the end cover 11 may be referred to as an end cover assembly.

[0100] The embodiment of the present application provides a battery cell 10 , which can improve the assembly quality and assembly efficiency of the battery cell 10 . The specific structure of the battery cell 10 is described in detail below with reference to the accompanying drawings.

[0101] Figure 7 A partial cross-sectional view of a battery cell 10 according to some embodiments of the present application; Figure 8 for Figure 7 Enlarged view of the middle C part; Fig. 9 for Figure 6 Enlarged view of middle part B; Fig.10 for Figure 4 Enlarged view of part A in the middle.

[0102] Reference Figure 4 and Figure 7 The embodiment of the present application provides a battery cell 10, which includes a shell 12 and an end cover 11. The thickness of at least two side walls of the shell 12 is unequal, the shell 12 has a first side wall 12a in a first direction X, and an opening 121 is formed at at least one end of the shell 12 along a second direction Z, and the second direction Z is perpendicular to the first direction X. The end cover 11 covers the opening 121.

[0103] Among them, refer to Figures 3 to 10 The end cover 11 is provided with a positioning portion 111 , and the first side wall 12 a is provided with a matching portion 122 matching with the positioning portion 111 .

[0104] The housing 12 may be a rectangular parallelepiped, a polygon, or an irregular shape. The side walls of the housing 12 may be of equal thickness or of unequal thickness. Taking the housing 12 as a rectangular parallelepiped as an example, the first side wall 12a may be one of the two opposite narrow sides of the housing 12 (the side wall with a smaller area, such as Fig.12 and Fig.13 The first side wall 12a may also be one of the two opposite large surfaces of the housing 12 (the side wall with a larger area, such as Fig.14 As shown), illustratively, the first side wall 12a is a narrow side of the shell 12.

[0105] The first side wall 12a may be any side wall of the housing 12. If the side walls of the housing 12 are of different thicknesses, the first side wall 12a may be the thickest side wall of the housing 12, the first side wall 12a may also be the thinnest side wall of the housing 12, or the first side wall 12a may also be a side wall of the housing 12 of medium thickness.

[0106] The positioning portion 111 and the matching portion 122 can be understood as a foolproof structure, which is used to prevent the end cover 11 from being assembled incorrectly relative to the housing 12, so that the end cover 11 is installed in the correct direction. It can be understood that if the positioning portion 111 and the matching portion 122 match successfully, it means that the assembly direction of the end cover 11 is correct. If the positioning portion 111 and the matching portion 122 do not match successfully, it means that the direction of the end cover 11 needs to be adjusted until the positioning portion 111 and the matching portion 122 match successfully. Successful matching can be that the positioning portion 111 and the matching portion 122 match in shape, such as wedging, snapping, etc. Successful matching can also be that the positioning portion 111 and the matching portion 122 are magnetically matched, etc. Successful matching can also be that the positioning portion 111 and the matching portion 122 match in position, for example, the positioning portion 111 and the matching portion 122 are two corresponding channels.

[0107] In this embodiment, the positioning portion 111 and the matching portion 122 serve as foolproof structures, which can reduce the possibility of the end cover 11 being assembled in the wrong direction relative to the housing 12 , thereby improving the assembly quality and efficiency of the battery cell 10 .

[0108] In some embodiments, one of the positioning portion 111 and the matching portion 122 is a protrusion, and the other is a groove, and at least a portion of the protrusion is received in the groove.

[0109] The positioning portion 111 may be a protrusion or a groove. If the positioning portion 111 is a protrusion, the matching portion 122 is a groove. If the positioning portion 111 is a groove, the matching portion 122 is a protrusion. Figures 8 to 10 In the embodiment, the positioning portion 111 is a protrusion and the matching portion 122 is a groove.

[0110] The protrusion can be partially accommodated in the groove, or the protrusion can be fully accommodated in the groove. The groove can be constructed as a contoured structure that matches the protrusion, or the groove can be constructed as a shape that corresponds to the protrusion but is different from the protrusion. It should be understood that the protrusion and the groove can be constructed in any shape, and the cooperation of the protrusion and the groove can play a fool-proof role so that the end cover 11 can be assembled in the correct direction. Therefore, this does not require the protrusion and the groove to be precisely matched and positioned or the shapes to match completely.

[0111] In this embodiment, one of the positioning portion 111 and the matching portion 122 is a protrusion, and the other is a groove. This fool-proof structure is a physical match with a simple structure, which can reduce the difficulty of preparing the shell 12 and the end cover 11.

[0112] In some embodiments, the protrusion and the groove have a clearance fit, that is, there is a gap between the outer peripheral surface of the protrusion and the inner surface of the groove, the groove is slightly larger than the protrusion, and the protrusion has a certain degree of freedom in the groove.

[0113] A portion of the protrusion can be easily accommodated in the groove, which can reduce the risk of interference between the protrusion and the groove.

[0114] Reference Figure 8 , Fig. 9 and Fig.10 In some embodiments, the positioning portion 111 is a protrusion and the matching portion 122 is a groove.

[0115] The positioning portion 111 is a protrusion. Providing the protrusion on the end cover 11 can improve the structural strength of the end cover 11 .

[0116] Fig.11 1 is a partial structural schematic diagram of the end cover 11 of some embodiments of the present application, which shows the inner surface of the end cover 11. Fig.11 In some embodiments, along the first direction X, the size of the protrusion is L1, satisfying 0.3 mm ≤ L1 ≤ 1 mm.

[0117] L1 can be understood as the size of the protrusion at the maximum position along the first direction X.

[0118] Illustratively, L1 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, and any value therebetween.

[0119] 0.3mm≤L1≤1mm, along the first direction X, the size of the protrusion is not too large, the occupied space is small, and the size of the protrusion is not too small, which can be used to prevent mistakes during the assembly process of the end cover 11 and the shell 12.

[0120] Reference Fig.11 In some embodiments, along the third direction Y, the size of the protrusion is L2, satisfying 0.3 mm ≤ L2 ≤ 1 mm, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0121] L2 can be understood as the dimension of the maximum position of the protrusion along the third direction Y.

[0122] Illustratively, L2 may be 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm, 1 mm, and any value therebetween.

[0123] 0.3mm≤L2≤1mm, along the third direction Y, the size of the protrusion is not too large, the occupied space is small, and the size of the protrusion is not too small, which can be used to prevent mistakes during the assembly process of the end cover 11 and the shell 12.

[0124] In some embodiments, along the second direction Z, the size of the protrusion is L3, which satisfies 0.3 mm ≤ L3 ≤ 2.5 mm. The first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0125] L3 can be understood as the size of the protrusion at the maximum position along the second direction Z.

[0126] Illustratively, L2 can be 0.3 mm, 0.5 mm, 0.7 mm, 0.8 mm, 1 mm, 1.2 mm, 1.4 mm, 1.6 mm, 1.8 mm, 2 mm, 2.3 mm, 2.5 mm, and any value therebetween.

[0127] 0.3mm≤L3≤2.5mm, along the second direction Z, the size of the protrusion is not too high, the occupied space is small, and the size of the protrusion is not too small, which can be used to prevent mistakes during the assembly of the end cover 11 and the shell 12.

[0128] Reference Figures 8 to 10 In some embodiments, the end cover 11 includes a body 112 and a boss 113, the boss 113 is arranged on a side of the body 112 facing the inside of the battery cell 10, the positioning portion 111 is arranged on the outer peripheral surface of the boss 113, and the matching portion 122 is arranged on the inner surface 1211 of the first side wall.

[0129] The boss 113 is a local protruding structure of the body 112 , and the boss 113 can improve the structural strength of the end cover 11 .

[0130] The boss 113 may contact the inner circumferential surface of the housing 12 so that the end cover 11 and the housing 12 are precisely positioned.

[0131] The positioning portion 111 is disposed on the outer peripheral surface of the boss 113 to facilitate the positioning portion 111 to cooperate with the matching portion 122 on the inner surface 1211 of the first side wall, and the arrangement of the positioning portion 111 and the matching portion 122 does not affect the consistency of the external interface of the battery cell 10.

[0132] Reference Figure 8 and Fig.10 In some embodiments, the first side wall 12a has a first end surface 1213 , the first end surface 1213 connects the inner surface 1211 of the first side wall and the outer surface 1212 of the first side wall, the matching portion 122 extends to the first end surface 1213 , and the body 112 abuts against the first end surface 1213 .

[0133] The first end surface 1213 can be understood as the end surface of the first side surface close to the end cover 11 .

[0134] The matching portion 122 extends to the first end surface 1213 . If the matching portion 122 is a protrusion, the protrusion extends to the first end surface 1213 . If the positioning portion 111 is a groove, a portion of the opening 121 of the groove is located at the first end surface 1213 .

[0135] In this embodiment, the matching portion 122 extends to the first end surface 1213, which can greatly reduce the difficulty of matching the positioning portion 111 with the matching portion 122. The abutment between the body 112 of the matching portion 122 and the first end surface 1213 can greatly improve the assembly stability of the end cover 11 and the housing 12.

[0136] Reference Figure 8 , Fig. 9 and Fig.11 In some embodiments, the boss 113 is provided with a guiding slope 1131 , and the guiding slope 1131 facilitates guiding the boss 113 into the shell, thereby reducing the difficulty of assembling the end cover 11 and the shell 12 .

[0137] Fig.12 Schematic diagram of the structure of the housing 12 according to some embodiments of the present application.

[0138] Reference Fig.12 In some embodiments, the shell 12 further includes a second side wall 12b disposed opposite to the first side wall 12a in the first direction X, and the thickness of the first side wall 12a is not equal to the thickness of the second side wall 12b.

[0139] The thickness of the first side wall 12 a may be greater than the thickness of the second side wall 12 b , or the thickness of the second side wall 12 b may be greater than the thickness of the first side wall 12 a .

[0140] The first side wall 12a and the second side wall 12b are designed with different thicknesses, so that the side walls corresponding to the areas with high strength requirements can be of larger thickness to improve the structural strength of the battery cell 10, and the side walls corresponding to the areas with lower strength requirements can be of smaller thickness to reduce the space occupied by the side walls, thereby providing a larger storage space for the electrode assembly 13 inside the battery cell 10.

[0141] The housing 12 formed by the first side wall 12a and the second side wall 12b having different thicknesses has a higher requirement for the correct assembly direction of the end cover 11, and it is particularly important to limit the end cover 11 to be assembled in the correct direction. The foolproof structure of the positioning portion 111 and the matching portion 122 can greatly reduce the possibility of assembling the end cover 11 and the housing 12 having different side walls in the wrong direction.

[0142] Reference Fig.12In some embodiments, the thickness of the first side wall 12a is greater than the thickness of the second side wall 12b.

[0143] The first side wall 12 a has a greater thickness and a higher structural strength. The matching portion 122 is located on the first side wall 12 a and has a smaller impact on the structural strength of the housing 12 .

[0144] Reference Figure 3 and Figure 4 In some embodiments, the battery cell 10 further includes a pressure relief mechanism 14 , which is disposed on the thicker one of the first side wall 12 a and the second side wall 12 b .

[0145] The pressure relief mechanism 14 is used to release the pressure inside the battery cell 10 when the pressure or temperature inside the battery cell 10 reaches a threshold value. The threshold value varies according to different design requirements. The threshold value may depend on one or more materials of the positive electrode sheet, the negative electrode sheet, the electrolyte and the isolation membrane in the battery cell 10. The pressure relief mechanism 14 can take the form of an explosion-proof valve, an explosion-proof disk, a pressure relief valve, etc., and can specifically adopt a pressure-sensitive element or structure, that is, when the internal pressure of the battery cell 10 reaches a predetermined threshold value, the pressure relief mechanism 14 performs an action or the weak structure provided in the pressure relief mechanism 14 is destroyed, thereby forming an opening 121 or a channel for internal pressure relief.

[0146] In this embodiment, the pressure relief mechanism 14 is arranged on the thicker one of the first side wall 12a and the second side wall 12b, that is, the pressure relief mechanism 14 is arranged on the side wall with higher strength between the first side wall 12a and the second side wall 12b, and the side wall with higher strength can provide stronger structural support for the pressure relief mechanism 14.

[0147] The foolproof structure is also applicable to other battery cells 10 formed by outer shells with side walls of unequal thickness, and can greatly improve the possibility of assembling the end cover 11 and the shell 12 with unequal side walls in the wrong direction.

[0148] Fig.13 Schematic diagram of the structure of the housing 12 of other embodiments of the present application.

[0149] Reference Fig.13 In some embodiments, the shell 12 has a third side wall 12c and a fourth side wall 12d that are relatively arranged in the third direction Y, the thickness of the third side wall 12c is not equal to the thickness of the fourth side wall 12d, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0150] The thickness of the third side wall 12c may be larger, or the thickness of the fourth side wall 12d may be larger. Fig.13 As shown, the thickness of the third side wall 12c is greater than the thickness of the fourth side wall 12d.

[0151] It should be noted that, in this embodiment, the first side wall 12a and the second side wall 12b may have the same thickness or different thicknesses.

[0152] In this embodiment, the third side wall 12c and the fourth side wall 12d are designed with different thicknesses, so that the side wall corresponding to the area with high strength requirements can be thicker to improve the structural strength of the battery cell 10, and the side wall corresponding to the area with low strength requirements can be thinner to reduce the space occupied by the side wall, providing a larger storage space for the electrode assembly 13 inside the battery cell 10. The positioning portion 111 and the matching portion 122 serve as foolproof structures, which can reduce the possibility of the end cap 11 being assembled in the wrong direction relative to the third side wall 12c and the fourth side wall 12d.

[0153] In some embodiments, the shell 12 also has a second side wall 12b arranged opposite to the first side wall 12a in the first direction X, and the shell 12 has a third side wall 12c and a fourth side wall 12d arranged opposite to each other in the third direction Y, and the outer surface areas of the third side wall 12c and the fourth side wall 12d are both larger than the outer surface areas of the first side wall 12a and the second side wall 12b, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0154] That is, the outer surface area of ​​the third side wall 12c is larger than the outer surface area of ​​the first side wall 1212 and larger than the outer surface area of ​​the second side wall 12b. The outer surface area of ​​the fourth side wall 12d is larger than the outer surface area of ​​the first side wall 1212 and larger than the outer surface area of ​​the second side wall 12b.

[0155] The outer surface area of ​​the third side wall 12c may be equal to or different from the outer surface area of ​​the fourth side wall 12d. The outer surface area of ​​the first side wall 1212 may be equal to or different from the outer surface area of ​​the second side wall 12b.

[0156] The outer surface refers to the side of the side wall facing the outside of the battery cell 10. Taking the case 12 as a rectangular parallelepiped as an example, the area of ​​the outer surface of the third side wall 12c is the area of ​​the third side wall 12c in the XZ plane, the area of ​​the outer surface of the fourth side wall 12d is the area of ​​the fourth side wall 12d in the XZ plane, the area of ​​the outer surface 1212 of the first side wall is the area of ​​the first side wall 12a in the YZ plane, and the area of ​​the outer surface of the second side wall 12b is the area of ​​the second wall in the YZ plane.

[0157] It can be understood that the third side wall 12c and the fourth side wall 12d are the two side walls with larger areas in the shell, and the first side wall 12a and the second side wall 12b are the two side walls with smaller areas in the shell. The thickness of the side walls of the shell is inconsistent, and the correct assembly direction of the end cover 11 relative to the shell 12 is required to be high. The setting of the fool-proof structure such as the positioning portion 111 and the matching portion 122 can greatly reduce the possibility of the end cover 11 being assembled in the wrong direction relative to the shell 12.

[0158] Fig.14 Schematic diagram of the structure of the housing 12 of some other embodiments of the present application.

[0159] In some embodiments, reference Fig.14 The shell 12 also has a second side wall 12b arranged opposite to the first side wall 12a in the first direction X, and the shell 12 has a third side wall 12c and a fourth side wall 12d arranged opposite to each other in the third direction Y, the outer surface areas of the first side wall 12a and the second side wall 12b are both larger than the outer surface areas of the third side wall 12c and the fourth side wall 12d, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0160] It can be understood that, in the present embodiment, the third side wall 12c and the fourth side wall 12d are the two side walls with smaller areas in the shell, and the first side wall 12a and the second side wall 12b are the two side walls with larger areas in the shell. The thickness of the side walls of the shell is inconsistent, and the requirements for the correct assembly direction of the end cover 11 relative to the shell 12 are high. By setting the fool-proof structure such as the positioning portion 111 and the matching portion 122, the possibility of the end cover 11 being assembled in the wrong direction relative to the shell 12 can be reduced to a great extent.

[0161] In some embodiments, the end cap 11 is welded to the shell 12. The weld mark formed by welding the end cap 11 and the shell 12 is arranged around the outer circumference of the end cap 11.

[0162] Welding methods include but are not limited to laser welding, friction welding, etc.

[0163] The welding of the end cap 11 and the shell 12 can improve the connection stability of the end cap 11 and the shell 12. The setting of the foolproof structure of the positioning portion 111 on the end cap 11 and the matching portion 122 on the shell 12 can greatly reduce the risk of the end cap 11 and the shell 12 being assembled in the wrong direction, resulting in a poor weld or difficulty in welding.

[0164] Reference Figure 4In some embodiments, the housing 12 has openings 121 at both ends along the second direction Z, and the two end covers 11 cover the two openings 121 . The battery cell 10 further includes a first electrode terminal 15a and a second electrode terminal 15b, which are disposed on the two end covers 11 , respectively.

[0165] Of course, the two electrode terminals 15 can also be disposed on the same end cap 11. In some embodiments, the battery cell 10 further includes a first electrode terminal 15a and a second electrode terminal 15b, and along the second direction Z, the first electrode terminal 15a and the second electrode terminal 15b are both disposed on the same side of the end cap 11. This facilitates the current to be drawn out from the same side of the battery cell 10.

[0166] The embodiment of the present application further provides a battery 100 , and the battery 100 includes the battery cell 10 provided in any of the above embodiments.

[0167] An embodiment of the present application further provides an electrical device, which includes the battery cell 10 provided in any of the above embodiments or the battery 100 provided in any of the above embodiments, and the battery cell 10 or the battery 100 is used to supply power to the electrical device.

[0168] Reference Figures 3 to 12, the embodiment of the present application also provides a battery cell 10, the battery cell 10 includes a shell, two end covers 11, two electrode terminals 15 with opposite polarities, a first insulating member 16, a second insulating member 18, a first insulating member 16 and a second insulating member 18. The shell 12 includes four side walls connected end to end, and the four side walls enclose a hollow structure with openings 121 at both ends. The two openings 121 are arranged relatively along the second direction Z. The four side walls are respectively a first side wall 12a, a second side wall 12b, a third side wall 12c and a fourth side wall 12d, the first side wall 12a and the second side wall 12b are arranged relatively along the first direction X, and the third side wall 12c and the fourth side wall 12d are arranged relatively along the third direction Y. The thickness of the first side wall 12a is greater than the thickness of the second side wall 12b, and the thickness of the second side wall 12b, the fourth side wall 12d and the fourth side wall 12d are equal. The first side wall 12a, the second side wall 12b, the third side wall 12c and the fourth side wall 12d are integrally formed. The pressure relief mechanism 14 is arranged on the first side wall 12a. The two electrode terminals 15 are fixed to the two end covers 11 by riveting blocks 17 respectively. The first insulating member 16 is an upper plastic, which is arranged between the end cover 11 and the riveting block 17 and is arranged around the riveting block 17. The second insulating member 18 is arranged on the inner surface of the end cover 11, and the second insulating member 18 is a lower plastic. The end cover 11 includes a body 112 and a boss 113, the boss 113 is arranged on the side of the body 112 facing the inside of the battery cell 10, the outer peripheral surface of the boss 113 contacts the inner peripheral surface of the shell, and the outer peripheral surface of the boss 113 is provided with a protrusion, the first side wall 12a has a first end face 1213, the first end face 1213 connects the inner surface 1211 and the outer surface of the first side wall, the inner surface 1211 of the first side wall is provided with a groove matching the protrusion, the groove extends to the first end face 1213, and the body 112 abuts against the first end face 1213. The protrusion is received in the groove. The boss 113 is provided with a guiding slope 1131 .

[0169] 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.

[0170] The above embodiments are only used to illustrate the technical solution of the present application and are not used 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 shell, wherein at least two side walls of the shell have unequal thicknesses, the shell has a first side wall in a first direction, and an opening is formed at at least one end of the shell along a second direction, the second direction being perpendicular to the first direction; An end cover, covering the opening; Wherein, the end cover is provided with a positioning portion, and the first side wall is provided with a matching portion matching with the positioning portion.

2. The battery cell according to claim 1, characterized in that: One of the positioning portion and the matching portion is a protrusion, and the other is a groove. At least a portion of the protrusion is accommodated in the groove.

3. The battery cell according to claim 2, characterized in that: The protrusion is loosely matched with the groove.

4. The battery cell according to claim 2, characterized in that: The positioning portion is a protrusion, and the matching portion is a groove.

5. The battery cell according to claim 2, characterized in that: Along the first direction, the size of the protrusion is L1, which satisfies 0.3 mm ≤ L1 ≤ 1 mm; and / or, Along the third direction, the size of the protrusion is L2, satisfying 0.3mm≤L2≤1mm; and / or, Along the second direction, the size of the protrusion is L3, satisfying 0.3mm≤L3≤2.5mm, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery cell according to any one of claims 1 to 5, characterized in that: The end cover includes a body and a boss, wherein the boss is arranged on a side of the body facing the inside of the battery cell, the positioning portion is arranged on an outer peripheral surface of the boss, and the matching portion is arranged on an inner surface of the first side wall.

7. The battery cell according to claim 6, characterized in that: The first side wall has a first end surface, the first end surface connects the inner surface and the outer surface of the first side wall, the matching portion extends to the first end surface, and the body abuts against the first end surface.

8. The battery cell according to any one of claims 1 to 5, characterized in that: The housing further comprises a second side wall disposed opposite to the first side wall in the first direction, and the thickness of the first side wall is not equal to the thickness of the second side wall.

9. The battery cell according to claim 8, characterized in that: The thickness of the first side wall is greater than the thickness of the second side wall.

10. The battery cell according to claim 8, characterized in that: The battery cell further comprises: The pressure relief mechanism is arranged on the thicker one of the first side wall and the second side wall.

11. The battery cell according to any one of claims 1 to 4, characterized in that: The shell has a third side wall and a fourth side wall that are oppositely arranged in the third direction, the thickness of the third side wall is not equal to the thickness of the fourth side wall, and the first direction, the second direction and the third direction are perpendicular to each other.

12. The battery cell according to any one of claims 1 to 4, characterized in that: The shell also has a second side wall arranged opposite to the first side wall in the first direction, and the shell has a third side wall and a fourth side wall arranged opposite to each other in the third direction, the outer surface areas of the third side wall and the fourth side wall are both larger than the outer surface areas of the first side wall and the second side wall, and the first direction, the second direction and the third direction are perpendicular to each other.

13. The battery cell according to any one of claims 1 to 4, characterized in that: The shell also has a second side wall arranged opposite to the first side wall in the first direction, and the shell has a third side wall and a fourth side wall arranged opposite to each other in the third direction, the outer surface areas of the first side wall and the second side wall are both larger than the outer surface areas of the third side wall and the fourth side wall, and the first direction, the second direction and the third direction are perpendicular to each other.

14. The battery cell according to any one of claims 1 to 5, characterized in that: The end cover is welded to the shell.

15. The battery cell according to any one of claims 1 to 5, characterized in that: The shell is provided with openings at both ends along the second direction, and two end covers are provided, and the two end covers cover the two openings respectively; The battery cell further includes a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are respectively disposed on the two end covers.

16. The battery cell according to any one of claims 1 to 5, characterized in that: The battery cell further includes a first electrode terminal and a second electrode terminal, and along the second direction, the first electrode terminal and the second electrode terminal are both disposed on the same side of the end cover.

17. A battery, characterized in that: A battery cell comprising the battery cell according to any one of claims 1 to 16.

18. An electrical equipment, characterized in that: It comprises the battery cell according to any one of claims 1 to 16 or the battery according to claim 17, wherein the battery cell or the battery is used to supply power to the electrical device.

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