Battery cell, battery, and electrical device

Abstract

A battery cell (10), a battery (100), and an electrical device, relating to the technical field of batteries. The battery cell (10) comprises: a casing (12), at least two side walls of the casing (12) having different thicknesses, the casing (12) having a first side wall (12a) in a first direction (X), at least one end of the casing (12) in a second direction (Z) being provided with an opening (121), and the second direction (Z) being perpendicular to the first direction (X); and an end cover (11), which covers the opening (121), the end cover (11) being provided with a positioning portion (111), and the first side wall (12a) being provided with a mating portion (122) mating with the positioning portion (111). The positioning portion (111) and the mating portion (122) serve as fool-proof structures, which can reduce the possibility of the end cover (11) being assembled in a wrong direction relative to the casing (12), thereby improving the assembly quality and assembly efficiency of the battery cell (10).

Description

Battery cell, battery and electric device

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application 202421305327.5, filed on June 7, 2024, entitled “Battery cell, battery and electric device”, the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular to a battery cell, a battery and an electric device. BACKGROUND

[0004] With the development of new energy technology, batteries are increasingly widely used. Batteries have high energy density, high reliability, long service life and green environmental protection to the society, and have been widely used in passenger cars, commercial vehicles, electric bicycles, heavy trucks, energy storage facilities, battery replacement stations, engineering manufacturing, intelligent instruments and the like, and also promote the development and research of communication terminals, medical instruments, energy development and the like.

[0005] In the battery production process, how to improve the assembly quality and efficiency of the battery cell is a technical problem to be solved.

[0006] SUMMARY

[0007] The embodiments of the present application provide a battery cell, a battery and an electric device, which can effectively improve the assembly quality and efficiency of the battery cell.

[0008] In a first aspect, the embodiments of the present application provide a battery cell, which comprises a shell and an end cover: the thicknesses of at least two side walls of the shell are not equal, the shell has a first side wall in a first direction, and the shell forms an opening at at least one end along a second direction, the second direction being perpendicular to the first direction; the end cover covers the opening.

[0009] 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.

[0010] In the above technical solution, the positioning part and the matching part serve as foolproof structures, which can reduce the possibility of assembling the end cover in the wrong direction relative to the shell, and improve the assembly quality and efficiency of the battery cell.

[0011] In some embodiments, one of the positioning part and the matching part is a protrusion, and the other is a groove, and at least a part of the protrusion is accommodated in the groove.

[0012] In the technical solution, one of the positioning part and the matching part is a protrusion, and the other is a groove, which is a fool-proof structure with simple structure and low difficulty in manufacturing the shell and the end cover.

[0013] In some embodiments, the protrusion and the groove are in clearance fit.

[0014] In the technical solution, a part of the protrusion is easily accommodated in the groove, reducing the risk of interference between the protrusion and the groove.

[0015] In some embodiments, the positioning part is a protrusion, and the matching part is a groove.

[0016] In the technical solution, the positioning part is a protrusion, and the protrusion on the end cover can improve the structural strength of the end cover.

[0017] In some embodiments, along the first direction, the size of the protrusion is L1, which satisfies 0.3mm≤L1≤1mm; and / or, along the third direction, the size of the protrusion is L2, which satisfies 0.3mm≤L2≤1mm; and / or, along the second direction, the size of the protrusion is L3, which satisfies 0.3mm≤L3≤2.5mm, and the first direction, the second direction and the third direction are perpendicular to each other.

[0018] In the technical solution, 0.3mm≤L1≤1mm, along the first direction, the size of the protrusion is not too large, occupying less space, and the size of the protrusion is not too small, which can be used for fool-proofing in the assembly process of the end cover and the shell. 0.3mm≤L2≤1mm, along the third direction, the size of the protrusion is not too large, occupying less space, and the size of the protrusion is not too small, which can be used for fool-proofing in the assembly process of the end cover and the shell. 0.3mm≤L3≤2.5mm, along the second direction, the size of the protrusion is not too high, occupying less space, and the size of the protrusion is not too small, which can be used for fool-proofing in the assembly process of the end cover and the shell.

[0019] In some embodiments, the end cover comprises a body and a boss, the boss is arranged on the side of the body facing the inside of the battery monomer, the positioning part is arranged on the outer circumferential surface of the boss, and the matching part is arranged on the inner surface of the first side wall.

[0020] In the technical solution, the positioning part is arranged on the outer circumferential surface of the boss, which facilitates the cooperation between the positioning part and the matching part on the inner surface of the first side wall, and the arrangement of the positioning part and the matching part does not affect the consistency of the external interface of the battery monomer.

[0021] In some embodiments, the first side wall has a first end face connecting the inner surface and the outer surface of the first side wall, the matching part extends to the first end face, and the body abuts against the first end face.

[0022] In the technical solution, the matching part extends to the first end face, which can greatly reduce the matching difficulty of the positioning part and the matching part. The abutment of the matching part body and the first end face can greatly improve the assembly stability of the end cover and the shell.

[0023] In some embodiments, the shell further has a second side wall opposite to the first side wall in a first direction, and the thickness of the first side wall is not equal to the thickness of the second side wall.

[0024] In the technical solution, the first side wall and the second side wall are designed with different thicknesses. The side wall corresponding to the area with high strength requirement has a larger thickness to improve the structural strength of the battery monomer, and the side wall corresponding to the area with low strength requirement has a smaller thickness to reduce the space occupation of the side wall and provide more storage space for the electrode assembly inside the battery monomer.

[0025] In some embodiments, the thickness of the first side wall is greater than the thickness of the second side wall.

[0026] In the technical solution, the first side wall has a larger thickness and higher structural strength, and the matching part is located on the first side wall, which has less effect on the structural strength of the shell.

[0027] In some embodiments, the battery monomer further comprises a pressure relief mechanism, and the pressure relief mechanism is arranged on one of the first side wall and the second side wall with a larger thickness.

[0028] In the technical solution, the pressure relief mechanism is arranged on one of the first side wall and the second side wall with a larger thickness, i.e. the pressure relief mechanism is arranged on the side wall with higher strength among the first side wall and the second side wall, which can provide stronger structural support for the pressure relief mechanism.

[0029] In some embodiments, the shell has a third side wall and a fourth side wall opposite to each other in a 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.

[0030] In the technical solution, the third side wall and the fourth side wall are designed with different thicknesses. The side wall corresponding to the area with high strength requirement has a larger thickness to improve the structural strength of the battery monomer, and the side wall corresponding to the area with low strength requirement has a smaller thickness to reduce the space occupation of the side wall and provide more storage space for the electrode assembly inside the battery monomer. The positioning part and the matching part as the foolproof structure can reduce the possibility of assembling the end cover in the wrong direction relative to the third side wall and the fourth side wall.

[0031] In some embodiments, the shell further has a second side wall opposite to the first side wall in a first direction, and has a third side wall and a fourth side wall opposite to each other in a third direction, the outer surface areas of the third side wall and the fourth side wall are both greater 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.

[0032] In the above technical solution, the third side wall and the fourth side wall are two side walls with larger areas in the shell, and the first side wall and the second side wall are two side walls with smaller areas in the shell. The shell has inconsistent thicknesses of the side walls, and has a high requirement for the correct assembly direction of the end cover relative to the shell. By means of the anti-fumble structure of 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 greatly reduced.

[0033] In some embodiments, the shell further has a second side wall opposite to the first side wall in a first direction, and has a third side wall and a fourth side wall opposite to each other in a third direction, the outer surface areas of the third side wall and the fourth side wall are both greater 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.

[0034] In the above technical solution, the third side wall and the fourth side wall are two side walls with smaller areas in the shell, and the first side wall and the second side wall are two side walls with larger areas in the shell. The shell has inconsistent thicknesses of the side walls, and has a high requirement for the correct assembly direction of the end cover relative to the shell. By means of the anti-fumble structure of 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 greatly reduced.

[0035] In some embodiments, the end cover is welded to the shell.

[0036] In the above technical solution, the welding of the end cover to the shell can improve the connection stability of the end cover and the shell. By means of the anti-fumble structure of the positioning part on the end cover and the matching part on the shell, the risk of the end cover being welded to the shell in the wrong direction can be greatly reduced.

[0037] In some embodiments, the shell is formed with the openings at both ends in the second direction, and the two end covers are respectively covered on the two openings; the battery monomer further comprises 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.

[0038] In some embodiments, the battery monomer further comprises a first electrode terminal and a second electrode terminal, and the first electrode terminal and the second electrode terminal are both arranged on the same side of the end cover in the second direction.

[0039] In the technical solution described above, the first electrode terminal and the second electrode terminal are located on the same side of the end cover, facilitating the current to be led out from the same side of the battery monomer.

[0040] In a second aspect, the embodiments of the present application provide a battery, which comprises the battery monomer provided by any of the embodiments of the first aspect.

[0041] In a third aspect, the embodiments of the present application provide a power consumption device, which comprises the battery monomer provided by any of the embodiments of the first aspect or the battery provided by any of the embodiments of the second aspect, and the battery monomer or the battery is used to supply power to the power consumption device. BRIEF DESCRIPTION OF DRAWINGS

[0042] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings needed in the embodiments will be briefly introduced as follows. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0043] FIG. 1 is a structural schematic diagram of a vehicle according to some embodiments of the present application;

[0044] FIG. 2 is an exploded schematic diagram of a battery according to some embodiments of the present application;

[0045] FIG. 3 is a structural schematic diagram of a battery monomer according to some embodiments of the present application;

[0046] FIG. 4 is an exploded schematic diagram of a battery monomer according to some embodiments of the present application;

[0047] FIG. 5 is a structural schematic diagram of an end cover assembly from one perspective according to some embodiments of the present application;

[0048] FIG. 6 is a structural schematic diagram of an end cover assembly from another perspective according to some embodiments of the present application;

[0049] FIG. 7 is a partial sectional view of a battery monomer according to some embodiments of the present application;

[0050] FIG. 8 is an enlarged view of part C in FIG. 7;

[0051] FIG. 9 is an enlarged view of part B in FIG. 6;

[0052] FIG. 10 is an enlarged view of part A in FIG. 4;

[0053] FIG. 11 is a partial structural schematic diagram of an end cover according to some embodiments of the present application;

[0054] FIG. 12 is a structural schematic diagram of a shell according to some embodiments of the present application;

[0055] FIG. 13 is a structural schematic diagram of a shell according to some embodiments of the present application;

[0056] FIG. 14 is a structural schematic diagram of a shell according to some other embodiments of the present application.

[0057] FIG. 13 is a structural schematic diagram of a shell according to some embodiments of the present application;

[0058] The accompanying drawings are not drawn to scale. In the drawings: DETAILED DESCRIPTION

[0059] In order to make the objects, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be described clearly below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0060] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used in the specification of the present application is only for the purpose of describing the specific embodiments of the present application and is not intended to limit the present application; the terms “include” and “have” and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover the non-exclusive inclusion. The terms “first”, “second”, and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0061] Reference to "an embodiment" or "the embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" or "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily referring to a single, alternative embodiment planarly or exclusively, unless explicitly so defined.

[0062] In the description of the application, it is necessary to explain that, unless otherwise explicitly specified and limited, the terms "mounting", "connecting", "connecting", "attaching" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the communication inside two elements. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0063] In the description of the application, it is necessary to explain that, unless otherwise specified, the meaning of "multiple" is more than two; the orientation or position relationship indicated by the terms "upper", "lower", "left", "right", "inner", "outer" and the like is only for the convenience of describing the application and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the application. In addition, the terms "first", "second", "third" and the like are only for descriptive purposes and cannot be understood as indicating or implying relative importance. "Vertical" is not strictly vertical, but within the allowable range of error. "Parallel" is not strictly parallel, but within the allowable range of error.

[0064] The term "and / or" in this application is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B can mean that A exists alone, A and B exist together, and B exists alone. In addition, the character " / " in this application generally represents that the front and rear associated objects have an "or" relationship.

[0065] In the embodiments of the application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the application shown in the drawings, as well as the overall thickness, length and width of the integrated device, are only exemplary and should not constitute any limitation on the application.

[0066] "Multiple" appearing in this application means more than two (including two).

[0067] In the present application, the battery cell can include, but is not limited to, a lithium-ion secondary battery, a lithium-ion primary battery, a lithium-sulfur battery, a sodium lithium-ion battery, a sodium-ion battery, or a magnesium-ion battery, etc. The battery cell includes, but is not limited to, a flat body, a cuboid, or other shapes, etc. The battery cell generally includes a cylindrical battery cell, a square battery cell, etc. in a packaging manner.

[0068] The battery cell includes an electrode assembly and an electrolyte, and the electrode assembly is composed of a positive electrode sheet, a negative electrode sheet, and a separator. The battery cell mainly relies on the movement of metal ions between the positive electrode sheet and the negative electrode sheet to work, and the metal ions (such as lithium ions) are embedded and extracted between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can prevent the positive electrode sheet and the negative electrode sheet from short-circuiting, and at the same time can make the active ions pass through.

[0069] The positive electrode sheet includes a positive electrode current collector and a positive electrode active material layer, the positive electrode active material layer is coated on the surface of the positive electrode current collector, and the positive electrode current collector without the positive electrode active material layer protrudes from the positive electrode current collector with the positive electrode active material layer, and the positive electrode current collector without the positive electrode active material layer serves as a positive electrode tab.

[0070] Taking a lithium-ion battery as an example, the positive electrode active material can be lithium cobaltate, lithium iron phosphate, ternary lithium, or lithium manganate, etc. The positive electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver surface plating treatment, stainless steel with silver surface plating treatment, stainless steel, copper, aluminum, a carbon electrode, carbon, nickel, or titanium, etc. can be adopted. The composite current collector can include a high polymer material base layer 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 high polymer material base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0071] The negative electrode sheet includes a negative electrode current collector and a negative electrode active material layer, the negative electrode active material layer is coated on the surface of the negative electrode current collector, and the negative electrode current collector without the negative electrode active material layer protrudes from the negative electrode current collector with the negative electrode active material layer, and the negative electrode current collector without the negative electrode active material layer serves as a negative electrode tab.

[0072] The negative electrode current collector can adopt a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver surface plating treatment, stainless steel with silver surface plating treatment, stainless steel, copper, aluminum, a carbon electrode, carbon, nickel, or titanium, etc. can be adopted. The negative electrode active material can be carbon or silicon, etc.

[0073] In order to reduce the risk of the tab being blown by a large current, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. The material of the separation film can be PP (polypropylene) or PE (polyethylene) or the like. In addition, the electrode assembly can be a winding type structure or a stacked type structure.

[0074] The battery referred to 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 referred to in the present application can include a battery module or a battery pack or the like. The battery generally includes a box for packaging one or more battery cells. The box can reduce the influence of liquid or other foreign matters on the charging or discharging of the battery cells.

[0075] In some embodiments, the battery can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0076] In some embodiments, the battery can be a battery pack, and the battery pack includes a box and battery cells, and the battery cells or battery modules are contained in the box.

[0077] In some embodiments, the multiple battery cells can be first integrated into at least one battery module, and then the battery module is installed in the box to form a battery pack. In this embodiment, auxiliary structural members such as cross beams can be provided between the battery modules to improve the installation stability of the battery modules in the box.

[0078] In some embodiments, the box can be part of the chassis structure of the vehicle. For example, part of the box can be at least part of the floor of the vehicle, or part of the box can be at least part of the cross beam and the longitudinal beam of the vehicle.

[0079] In some embodiments, the battery can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0080] In the battery cell technology, the end cover covers the opening of the shell to form the external structure of the battery cell, and the assembly direction of the end cover relative to the shell is wrong, which will affect the assembly quality and efficiency of the battery cell. Especially in the structure of the shell with unequal thickness of the side wall, the assembly direction of the end cover is wrong, which will cause the low consistency (misalignment) of the interface between the end cover and the shell, and cause the end cover and the shell to be virtual welded or difficult to be welded.

[0081] 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 battery cell assembly quality and assembly efficiency, an embodiment of the present application provides a technical solution of setting a positioning part on the end cover and a matching part on the shell, the positioning part and the matching part as foolproof structure, through the cooperation of 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, and the battery cell assembly quality and assembly efficiency can be improved.

[0082] The technical solution disclosed by the embodiments of the present application is applicable to, but not limited to, batteries and power consumption devices using batteries.

[0083] The power consumption device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy and an electric tool, etc. The vehicle can be a fuel automobile, a gas automobile or a new energy automobile, and the new energy automobile can be a pure electric automobile, a hybrid electric automobile or a range extended automobile, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, for example, a game machine, an electric automobile toy, an electric ship toy and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact electric drill, a concrete vibrator and an electric planer, etc.

[0084] The following embodiments are described taking the vehicle as an example for convenience of description.

[0085] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 according to some embodiments of the present application. The vehicle 1000 is internally provided with a battery 100, which can be arranged at the bottom, the head or the tail of the vehicle 1000. The battery 100 can be used for power supply of the vehicle 1000, for example, the battery 100 can be used as an operating power source of the vehicle 1000.

[0086] The vehicle 1000 can further include a controller 300 and a motor 200, and the controller 300 is used to control the battery 100 to supply power to the motor 200, for example, for the working power demand of the vehicle 1000 during starting, navigation and driving.

[0087] In some embodiments of the present application, the battery 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, instead of or partially instead of fuel or natural gas to provide driving power for the vehicle 1000.

[0088] In some embodiments, referring to FIG. 2, which is an exploded schematic view of a battery 100 including a plurality of battery cells 10 according to some embodiments of the present application, the plurality of battery cells 10 can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 10 are connected in both series and parallel.

[0089] In some embodiments, the battery 100 can further include a busbar component (not shown in the figure) to electrically connect the plurality of battery cells 10 to achieve the series, parallel, or mixed connection of the plurality of battery cells 10.

[0090] The busbar component can be a metal conductor, such as copper, iron, aluminum, steel, aluminum alloy, etc.

[0091] In some embodiments, the battery 100 can further include a box 20 to accommodate the battery cells 10. The box 20 can include a first part 21 and a second part 22, which are coupled to each other to define an accommodation space 23 for accommodating the battery cells 10. Of course, the connection between the first part 21 and the second part 22 can be sealed by a sealing element (not shown in the figure), which can be a sealing ring, sealing glue, etc.

[0092] The first part 21 and the second part 22 can be various shapes. The first part 21 can be a hollow structure with one side open, and the second part 22 can also be a hollow structure with one side open. The open side of the second part 22 is coupled to the open side of the first part 21 to form the box 20 with the accommodation space 23. Of course, the first part 21 can be a hollow structure with one side open, and the second part 22 can be a plate structure. The second part 22 is coupled to the open side of the first part 21 to form the box 20 with the accommodation space 23.

[0093] Referring to FIG. 3 and FIG. 4, FIG. 3 is a structural schematic view of a battery cell 10 according to some embodiments of the present application, and FIG. 4 is an exploded schematic view of the battery cell 10 according to some embodiments of the present application. The battery cell 10 can include a housing 12, an electrode assembly 13, an end cover 11, an electrode terminal 15, and other functional components.

[0094] The housing 12 is a component for accommodating the electrode assembly 13. The housing 12 can be a hollow structure with one end open 121, or a hollow structure with both ends open 121. The material of the housing 12 can be various, such as copper, iron, aluminum, steel, aluminum alloy, etc. The housing 12 can be various shapes. For example, in FIG. 3, the housing 12 is a cuboid.

[0095] The end cover 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 cover 11 covers the opening 121 of the shell 12, and the end cover 11 and the shell 12 together define a sealed space for accommodating the electrode assembly 13, the electrolyte, and other functional components. The shape of the end cover 11 can be adapted to the shape of the shell 12, for example, the shell 12 is a cuboid structure, and the end cover 11 is a rectangular plate structure adapted to the shell 12. The material of the end cover 11 can also be various, for example, the end cover 11 can be a metal material such as copper, iron, aluminum, steel, aluminum alloy, etc. The material of the end cover 11 can be the same as or different from the material of the shell 12.

[0096] In the battery cell 10, the end cover 11 can be one or two. If the shell 12 is a hollow structure with an opening 121 formed at one end, one end cover 11 is correspondingly provided; if the shell 12 is a hollow structure with openings 121 formed at both ends, two end covers 11 are correspondingly provided, and the two end covers 11 cover the two openings 121 of the shell 12, respectively.

[0097] FIG. 5 is a structural schematic diagram of an end cover assembly of some embodiments of the present application from one viewing angle; and FIG. 6 is a structural schematic diagram of an end cover assembly of some embodiments of the present application from another viewing angle.

[0098] Referring to FIGS. 5 and 6, the electrode terminal 15 is a component that leads out the current of the battery cell 10, and the electrode terminal 15 can be provided with two, which are the positive electrode terminal and the negative electrode terminal, respectively. If the end cover 11 is provided with one, the two electrode terminals 15 can be provided on the same end cover 11. If the end cover 11 is provided with two, the two electrode terminals 15 can be provided on the two end covers 11, respectively.

[0099] Referring to FIG. 5, in some embodiments, the battery cell 10 can further include a riveting block 17, which is provided on the end cover 11, fixed to the end cover 11, and on which the electrode terminal 15 is riveted. The material of the riveting block 17 includes but is not limited to aluminum, copper, steel, and alloys thereof, etc.

[0100] Referring to FIG. 5, in some embodiments, the battery cell 10 can further include a first insulating member 16, which is provided between the end cover 11 and the riveting block 17 and surrounds the riveting block 17. The first insulating member 16 can be a plastic member, a rubber member, etc. Optionally, the first insulating member 16 is an upper plastic.

[0101] Referring to FIG. 6, in some embodiments, the battery monomer 10 can further include a second insulating piece 18 arranged on an inner surface of the end cover 11 to insulate the end cover 11 from other components inside the battery monomer 10. The inner surface of the end cover 11 is a side of the end cover 11 facing the inside of the battery monomer 10. The second insulating piece 18 can be a plastic piece, a rubber piece, or the like. Optionally, the second insulating piece 18 is a lower plastic.

[0102] The end cover 11 and the functional components arranged on the end cover 11 can be referred to as an end cover assembly.

[0103] Embodiments of the present application provide a battery monomer 10 capable of improving the assembly quality and efficiency of the battery monomer 10. The specific structure of the battery monomer 10 is described in detail below in conjunction with the accompanying drawings.

[0104] FIG. 7 is a partial cross-sectional view of the battery monomer 10 according to some embodiments of the present application; FIG. 8 is an enlarged view of part C in FIG. 7; FIG. 9 is an enlarged view of part B in FIG. 6; and FIG. 10 is an enlarged view of part A in FIG. 4.

[0105] Referring to FIGS. 4 and 7, embodiments of the present application provide a battery monomer 10 including a housing 12 and an end cover 11. At least two side walls of the housing 12 are of unequal thickness, the housing 12 has a first side wall 12a in a first direction X, and the housing 12 is formed with an opening 121 at at least one end in a second direction Z perpendicular to the first direction X. The end cover 11 covers the opening 121.

[0106] In which, referring to FIGS. 3 to 10, the end cover 11 is provided with a positioning portion 111, and the first side wall 12a is provided with a cooperating portion 122 cooperating with the positioning portion 111.

[0107] The housing 12 can be a cuboid, a polygon, or a special-shaped housing, etc. The side walls of the housing 12 can be of equal thickness or of unequal thickness. Taking the housing 12 as a cuboid for example, the first side wall 12a can be one of the two opposite narrow faces of the housing 12 (a smaller side wall, as shown in FIGS. 12 and 13), or the first side wall 12a can be one of the two opposite large faces of the housing 12 (a larger side wall, as shown in FIG. 14). Exemplarily, the first side wall 12a is a narrow face of the housing 12.

[0108] The first side wall 12a can be any one of the side walls of the housing 12. If the side walls of the housing 12 are of unequal thickness, the first side wall 12a can be the thickest side wall of the housing 12, or the first side wall 12a can be the thinnest side wall of the housing 12, or the first side wall 12a can also be a side wall of the housing 12 with an intermediate thickness.

[0109] The positioning portion 111 and the cooperating portion 122 can be understood as a fool-proof structure for preventing the end cover 11 from being assembled in a wrong direction relative to the shell 12, so that the end cover 11 is mounted in a correct direction. It can be understood that if the positioning portion 111 and the cooperating portion 122 are successfully matched, it means that the end cover 11 is assembled in a correct direction, and if the positioning portion 111 and the cooperating portion 122 are not successfully matched, it means that the end cover 11 needs to be adjusted until the positioning portion 111 and the cooperating portion 122 are successfully matched. Successful matching can be that the positioning portion 111 and the cooperating portion 122 are matched in shape, such as wedging, snapping, etc. Successful matching can also be that the positioning portion 111 and the cooperating portion 122 are matched in magnetism, etc. Successful matching can also be that the positioning portion 111 and the cooperating portion 122 are matched in position, for example, the positioning portion 111 and the cooperating portion 122 are two corresponding holes.

[0110] In the embodiment, the positioning portion 111 and the cooperating portion 122 as a fool-proof structure can reduce the possibility of the end cover 11 being assembled in a wrong direction relative to the shell 12, and improve the assembly quality and efficiency of the battery monomer 10.

[0111] In some embodiments, one of the positioning portion 111 and the cooperating portion 122 is a protrusion, and the other is a groove, and at least a part of the protrusion is accommodated in the groove.

[0112] The positioning portion 111 can be a protrusion, and the positioning portion 111 can also be a groove. If the positioning portion 111 is a protrusion, the cooperating portion 122 is a groove, and if the positioning portion 111 is a groove, the cooperating portion 122 is a protrusion. Exemplarily, in FIGS. 8-10, the positioning portion 111 is a protrusion, and the cooperating portion 122 is a groove.

[0113] The protrusion can be partially accommodated in the groove, and the protrusion can also be fully accommodated in the groove. The groove can be configured as a profile structure matched with the protrusion, and the groove can also be configured as a shape corresponding to the protrusion but different from the protrusion. It should be understood that the protrusion and the groove can be configured in any shape, and the cooperation of the protrusion and the groove can play a fool-proof role to enable the end cover 11 to be assembled in a correct direction, and therefore, it is not required that the protrusion and the groove are accurately matched in position or completely matched in shape.

[0114] In the embodiment, one of the positioning portion 111 and the cooperating portion 122 is a protrusion, and the other is a groove, and such a fool-proof structure is a physical cooperation, simple in structure, and capable of reducing the difficulty in manufacturing the shell 12 and the end cover 11.

[0115] In some embodiments, the protrusion and the groove are matched with a gap. 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.

[0116] A part of the protrusion is easily accommodated in the groove, and the risk of interference between the protrusion and the groove can be reduced.

[0117] Referring to FIGS. 8, 9 and 10, in some embodiments, the positioning portion 111 is a protrusion and the cooperating portion 122 is a groove.

[0118] The positioning portion 111 is a protrusion, and the protrusion provided on the end cover 11 can improve the structural strength of the end cover 11.

[0119] FIG. 11 is a schematic diagram of a partial structure of the end cover 11 of some embodiments of the present application, showing the inner surface of the end cover 11. Referring to FIG. 11, in some embodiments, along the first direction X, the size of the protrusion is L1, which satisfies 0.3mm≤L1≤1mm.

[0120] L1 can be understood as the size at the maximum position of the protrusion along the first direction X.

[0121] Exemplarily, L1 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and any value therebetween, etc.

[0122] 0.3mm≤L1≤1mm, the size of the protrusion along the first direction X is not too large, occupies less space, and the size of the protrusion is also not too small, which can be used for foolproofing during assembly of the end cover 11 and the shell 12.

[0123] Referring to FIG. 11, in some embodiments, along the third direction Y, the size of the protrusion is L2, which satisfies 0.3mm≤L2≤1mm, and the first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0124] L2 can be understood as the size at the maximum position of the protrusion along the third direction Y.

[0125] Exemplarily, L2 can be 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, 1mm, and any value therebetween, etc.

[0126] 0.3mm≤L2≤1mm, the size of the protrusion along the third direction Y is not too large, occupies less space, and the size of the protrusion is also not too small, which can be used for foolproofing during assembly of the end cover 11 and the shell 12.

[0127] In some embodiments, along the second direction Z, the size of the protrusion is L3, which satisfies 0.3mm≤L3≤2.5mm. The first direction X, the second direction Z and the third direction Y are perpendicular to each other.

[0128] L3 can be understood as the size at the maximum position of the protrusion along the second direction Z.

[0129] Exemplarily, 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.

[0130] 0.3 mm≤L3≤2.5 mm, along the second direction Z, the size of the protrusion is not too high, occupying less space, and the size of the protrusion is not too small, which can be used to prevent the end cover 11 and the shell 12 from being assembled.

[0131] Referring to FIGS. 8-10, in some embodiments, 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 monomer 10, the positioning part 111 is arranged on the outer circumferential surface of the boss 113, and the matching part 122 is arranged on the inner surface 1211 of the first side wall.

[0132] The boss 113 is a local protruding structure of the body 112, which can improve the structural strength of the end cover 11.

[0133] The boss 113 can be in contact with the inner circumferential surface of the shell 12, so as to accurately position the end cover 11 and the shell 12.

[0134] The positioning part 111 is arranged on the outer circumferential surface of the boss 113, which facilitates the cooperation of the positioning part 111 and the matching part 122 on the inner surface 1211 of the first side wall, and the arrangement of the positioning part 111 and the matching part 122 does not affect the consistency of the external interface of the battery monomer 10.

[0135] Referring to FIGS. 8 and 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 part 122 extends to the first end surface 1213, and the body 112 abuts against the first end surface 1213.

[0136] The first end surface 1213 can be understood as the end surface of the first side surface close to the end cover 11.

[0137] The matching part 122 extends to the first end surface 1213. If the matching part 122 is a protrusion, the protrusion extends to the first end surface 1213. If the positioning part 111 is a groove, a part of the opening 121 of the groove is located on the first end surface 1213.

[0138] In the embodiment, the matching part 122 extends to the first end surface 1213, which can greatly reduce the cooperation difficulty of the positioning part 111 and the matching part 122. The abutment of the body 112 and the first end surface 1213 of the matching part 122 can greatly improve the assembly stability of the end cover 11 and the shell 12.

[0139] Referring to FIG. 8, FIG. 9 and FIG. 11, in some embodiments, the boss 113 is provided with a guide slope 1131, which facilitates guiding the boss 113 into the shell, and reduces the difficulty of assembling the end cover 11 and the shell 12.

[0140] FIG. 12 is a schematic diagram of the structure of the shell 12 according to some embodiments of the present application.

[0141] Referring to FIG. 12, in some embodiments, the shell 12 further has a second side wall 12b 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.

[0142] In some embodiments, the thickness of the first side wall 12a can be greater than the thickness of the second side wall 12b, or the thickness of the second side wall 12b can be greater than the thickness of the first side wall 12a.

[0143] The first side wall 12a and the second side wall 12b are designed to have different thicknesses, so that the side wall corresponding to the area with high strength requirement has a greater thickness to improve the structural strength of the battery monomer 10, and the side wall corresponding to the area with low strength requirement has a smaller thickness to reduce the space occupation of the side wall and provide more storage space for the electrode assembly 13 inside the battery monomer 10.

[0144] The shell 12 with 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 assembly of the end cover 11 in the correct direction. The fool-proof structure of the positioning part 111 and the cooperating part 122 can greatly improve the possibility of assembling the end cover 11 and the shell 12 with different thicknesses of the side walls in the wrong direction.

[0145] Referring to FIG. 12, in some embodiments, the thickness of the first side wall 12a is greater than the thickness of the second side wall 12b.

[0146] The first side wall 12a has a greater thickness and higher structural strength, and the cooperating part 122 is located on the first side wall 12a, which has less impact on the structural strength of the shell 12.

[0147] Referring to FIG. 3 and FIG. 4, in some embodiments, the battery monomer 10 further comprises a pressure relief mechanism 14, which is arranged on the side wall with a greater thickness among the first side wall 12a and the second side wall 12b.

[0148] The pressure relief mechanism 14 is configured 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 can depend on the material of one or more of the positive plate, the negative plate, the electrolyte, and the separator in the battery cell 10. The pressure relief mechanism 14 can take the form of, for example, a burst valve, a burst disk, a pressure relief valve, and the like, and can specifically take the form of a pressure-sensitive element or structure that is activated when the internal pressure of the battery cell 10 reaches a predetermined threshold value, or a weak structure provided in the pressure relief mechanism 14 that is broken when the internal pressure of the battery cell 10 reaches a predetermined threshold value, thereby forming an opening 121 or passage through which the internal pressure can be released.

[0149] In this embodiment, the pressure relief mechanism 14 is provided on the one of the first side wall 12a and the second side wall 12b that has a greater thickness, i.e., the pressure relief mechanism 14 is provided on the one of the first side wall 12a and the second side wall 12b that has a greater strength, which can provide stronger structural support for the pressure relief mechanism 14.

[0150] The fool-proof structure can also be applied to a battery cell 10 having a housing 12 with side walls of unequal thickness, and can greatly reduce the likelihood of the end cover 11 being assembled in the wrong direction relative to the housing 12 with side walls of unequal thickness.

[0151] FIG. 13 is a structural schematic view of a housing 12 according to some embodiments of the present application.

[0152] Referring to FIG. 13, in some embodiments, the housing 12 has a third side wall 12c and a fourth side wall 12d disposed opposite each other in a third direction Y, the third side wall 12c and the fourth side wall 12d have unequal thicknesses, and the first direction X, the second direction Z, and the third direction Y are perpendicular to each other.

[0153] The third side wall 12c can have a greater thickness, or the fourth side wall 12d can have a greater thickness. For example, as shown in FIG. 13, the third side wall 12c has a greater thickness than the fourth side wall 12d.

[0154] It should be noted that in this embodiment, the first side wall 12a and the second side wall 12b can have equal thicknesses or unequal thicknesses.

[0155] In this embodiment, the third side wall 12c and the fourth side wall 12d have unequal thicknesses, which can be used to increase the thickness of the side wall corresponding to a region with a high strength requirement to improve the structural strength of the battery cell 10, and to decrease the thickness of the side wall corresponding to a region with a low strength requirement to reduce the space occupied by the side wall and provide a larger storage space for the electrode assembly 13 inside the battery cell 10. The positioning portion 111 and the cooperating portion 122 as the fool-proof structure can reduce the likelihood of the end cover 11 being assembled in the wrong direction relative to the third side wall 12c and the fourth side wall 12d.

[0156] In some embodiments, the shell 12 further has a second side wall 12b opposite to the first side wall 12a in the first direction X, and has a third side wall 12c and a fourth side wall 12d opposite to each other in the third direction Y, the outer surface areas of the third side wall 12c and the fourth side wall 12d are both greater 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.

[0157] That is, the outer surface area of the third side wall 12c is greater than the outer surface area of the first side wall 12a and greater than the outer surface area of the second side wall 12b. The outer surface area of the fourth side wall 12d is greater than the outer surface area of the first side wall 12a and greater than the outer surface area of the second side wall 12b.

[0158] The outer surface area of the third side wall 12c and the outer surface area of the fourth side wall 12d can be equal or different. The outer surface area of the first side wall 12a and the outer surface area of the second side wall 12b can be equal or different.

[0159] The outer surface refers to the side of the side wall facing the outside of the battery cell 10. Taking the shell 12 as a cuboid for 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 of the first side wall 12a 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 side wall in the YZ plane.

[0160] It can be understood that the third side wall 12c and the fourth side wall 12d are two side walls with larger areas in the shell, and the first side wall 12a and the second side wall 12b are two side walls with smaller areas in the shell. The shell has inconsistent side wall thicknesses, and the correct assembly direction of the end cover 11 relative to the shell 12 is required. By providing the fool-proof structure of the positioning portion 111 and the matching portion 122, the possibility of assembling the end cover 11 relative to the shell 12 in the wrong direction can be greatly reduced.

[0161] FIG. 14 is a structural schematic diagram of the shell 12 of some embodiments of the present application.

[0162] In some embodiments, referring to FIG. 14, the shell 12 further has a second side wall 12b opposite to the first side wall 12a in the first direction X, and has a third side wall 12c and a fourth side wall 12d 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 greater 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.

[0163] It can be understood that, in the embodiment, the third side wall 12c and the fourth side wall 12d are two side walls with smaller areas in the shell, the first side wall 12a and the second side wall 12b are two side walls with larger areas in the shell, the shell has inconsistent side wall thicknesses, and the correct assembly direction of the end cover 11 relative to the shell 12 is required to be high. Through the setting of the fool-proof structure of 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 greatly reduced.

[0164] In some embodiments, the end cover 11 is welded with the shell 12. The welding mark formed by welding the end cover 11 with the shell 12 is arranged around the outer periphery of the end cover 11.

[0165] The welding mode includes but is not limited to laser welding, friction welding, etc.

[0166] Welding the end cover 11 with the shell 12 can improve the connection stability of the end cover 11 and the shell 12. Through the setting of the fool-proof structure of the positioning portion 111 on the end cover 11 and the matching portion 122 on the shell 12, the risk of the end cover 11 being difficult to weld or false welding with the shell 12 due to the end cover 11 being assembled in the wrong direction relative to the shell 12 can be greatly reduced.

[0167] Referring to FIG. 4, in some embodiments, the shell 12 is formed with openings 121 at both ends along the second direction Z, and two end covers 11 are respectively covered on the two openings 121. The battery monomer 10 further includes a first electrode terminal 15a and a second electrode terminal 15b, and the first electrode terminal 15a and the second electrode terminal 15b are respectively arranged on the two end covers 11.

[0168] Of course, the two electrode terminals 15 can also be arranged on the same end cover 11. In some embodiments, the battery monomer 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 arranged on the same side of the end cover 11. It is convenient to lead out the current from the same side of the battery monomer 10.

[0169] The embodiments of the present application also provide a battery 100, which includes the battery monomer 10 provided by any of the above embodiments.

[0170] The embodiments of the present application also provide a power consumption device, which includes the battery monomer 10 provided by any of the above embodiments or the battery 100 provided by any of the above embodiments, and the battery monomer 10 or the battery 100 is used to supply power to the power consumption device.

[0171] With reference to FIGS. 3-12, the application also provides a battery cell 10, which includes a housing, two end covers 11, two electrode terminals 15 of opposite polarity, a first insulating member 16, a second insulating member 18, and the first insulating member 16 and the second insulating member 18. The housing 12 includes four side walls connected end to end, which enclose a hollow structure with two openings 121. The two openings 121 are oppositely arranged 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 oppositely arranged along the first direction X, and the third side wall 12c and the fourth side wall 12d are oppositely arranged 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 thicknesses of the second side wall 12b, the third side wall 12c, 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 respectively fixed to the two end covers 11 by riveting blocks 17. The first insulating member 16 is an upper plastic, which is arranged between the end cover 11 and the riveting block 17 and surrounds 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 is in contact with the inner peripheral surface of the housing, the outer peripheral surface of the boss 113 is provided with a protrusion, the first side wall 12a has a first end surface 1213, the first end surface 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 matched with the protrusion, the groove extends to the first end surface 1213, and the body 112 abuts against the first end surface 1213. The protrusion is accommodated in the groove. The boss 113 is provided with a guide inclined surface 1131.

[0172] It should be noted that the embodiments and the features in the embodiments in the application can be combined with each other without conflict.

[0173] The above embodiments are only used to illustrate the technical solutions of the application, and are not used to limit the application. For those skilled in the art, the application can have various modifications and changes. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A battery cell, characterized by, The battery monomer comprises: a shell, thicknesses of at least two side walls of the shell are not equal, the shell has a first side wall in a first direction, at least one end of the shell along a second direction forms an opening, the second direction is perpendicular to the first direction; an end cover covering 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.

2. The battery cell of claim 1, wherein, One of the positioning part and the matching part is a protrusion, and the other is a groove, and at least a part of the protrusion is accommodated in the groove.

3. The battery cell of claim 2, wherein, The protrusion and the groove are gap matched.

4. The battery cell according to claim 2 or 3, characterized in that, The positioning part is a protrusion, and the matching part is a groove.

5. The battery cell of any one of claims 2-4, wherein, In the first direction, a size of the protrusion is L1, and 0.3mm≤L1≤1mm is satisfied; and / or, In a third direction, a size of the protrusion is L2, and 0.3mm≤L2≤1mm is satisfied; and / or, In the second direction, a size of the protrusion is L3, and 0.3mm≤L3≤2.5mm is satisfied, and the first direction, the second direction and the third direction are perpendicular to each other.

6. The battery cell of any one of claims 1-5, wherein, The end cover comprises a body and a boss, the boss is arranged on a side of the body facing the inside of the battery monomer, the positioning part is arranged on an outer circumferential surface of the boss, and the matching part is arranged on an inner surface of the first side wall.

7. The battery cell of claim 6, wherein, The first side wall has a first end surface connecting an inner surface and an outer surface of the first side wall, the matching part extends to the first end surface, and the body abuts against the first end surface.

8. The battery cell of any one of claims 1-7, wherein, The shell further has a second side wall arranged opposite to the first side wall in the first direction, and thicknesses of the first side wall and the second side wall are not equal.

9. The battery cell of claim 8, wherein, The thickness of the first side wall is greater than that of the second side wall.

10. The battery cell according to claim 8 or 9, characterized in that, The battery monomer further comprises: a pressure relief mechanism arranged on one of the first side wall and the second side wall with a greater thickness.

11. The battery cell of any one of claims 1-10, wherein, The shell has a third side wall and a fourth side wall arranged opposite to each other in a third direction, thicknesses of the third side wall and the fourth side wall are not equal, and the first direction, the second direction and the third direction are perpendicular to each other.

12. The battery cell of any one of claims 1-11, wherein, The shell further 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, outer surface areas of the third side wall and the fourth side wall are greater than those 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 of any one of claims 1-11, wherein, The shell further 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, outer surface areas of the first side wall and the second side wall are greater than those 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 of any one of claims 1-13, wherein, The end cover is welded with the shell.

15. The battery cell of any one of claims 1-14, wherein, The shell forms the opening at two ends along the second direction respectively, and the end cover is provided with two end covers covering two openings respectively. The battery cell further comprises a first electrode terminal and a second electrode terminal, which are respectively arranged on the two end covers.

16. The battery cell of any one of claims 1-15, wherein, The battery cell further comprises a first electrode terminal and a second electrode terminal, which are both arranged on the same side of the end cover along the second direction.

17. A battery, characterized by A battery comprising the battery cell of any one of claims 1-16.

18. An electrical device, characterized by A battery comprising the battery cell of any one of claims 1-16 or the battery of claim 17, which is used to power the electrical device.

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