Battery cell, battery device and electric device

Abstract

The utility model discloses a battery monomer, a battery device and a power utilization device. The battery monomer comprises a shell, a cover body, an electrode assembly, an insulating part and an adapter, the electrode assembly is arranged in the shell and comprises a tab; the insulating part is arranged on one side, facing the electrode assembly, of the cover body; a limiting bulge is arranged on one side, facing the electrode assembly, of the insulating part; the adapter is at least partially arranged between the electrode assembly and the insulating part, one side of the adapter is connected with the tab, the side, away from the tab, of the adapter is connected with the cover body and the insulating part, and the limiting protrusion is arranged adjacent to the side face, close to the edge of the insulating part, of the adapter so as to be used for limiting the adapter to move towards the edge of the insulating part. And the limiting bulge can reduce the probability that the cover body and the shell are overlapped through the adapter, or reduce the probability that the electrode assembly and the shell are overlapped, so that the probability that the battery monomer is short-circuited can be reduced, and the working performance of the battery monomer can be improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of batteries, in particular to a battery monomer, a battery device and a power consumption device. BACKGROUND

[0002] The battery monomer comprises a cover body, a shell, an electrode assembly, an insulating piece and a switching piece. The insulating piece is used for isolating the cover body and the shell. The switching piece is used for connecting with the tab of the electrode assembly, so as to facilitate the output of the current of the electrode assembly. In the manufacturing process of the battery monomer, the switching piece is first connected with the tab, and then connected with the insulating piece and the cover body. However, the switching piece is prone to deviation in the process of being connected with the insulating piece and the cover body, which will affect the working performance of the battery monomer. CONTENT OF THE UTILITY MODEL

[0003] In view of the above problems, the embodiments of the present application provide a battery monomer, a battery device and a power consumption device, which can solve the problem that the switching piece is prone to deviation in the process of being connected with the insulating piece and the cover body, thereby affecting the working performance of the battery monomer.

[0004] The battery monomer of the embodiments of the present application comprises a shell, a cover body, an electrode assembly, an insulating piece and a switching piece. The electrode assembly is arranged in the shell, and the electrode assembly comprises a tab. The insulating piece is arranged on the side of the cover body facing the electrode assembly, and the insulating piece is provided with a limiting protrusion on the side facing the electrode assembly. The switching piece is at least partially arranged between the electrode assembly and the insulating piece. One side of the switching piece is connected with the tab, and the side of the switching piece away from the tab is connected with the cover body and the insulating piece. The limiting protrusion is arranged adjacent to the side surface of the switching piece close to the edge of the insulating piece, so as to limit the movement of the switching piece towards the edge of the insulating piece.

[0005] In the battery monomer of the embodiments of the present application, the position deviation of the switching piece is limited by the limiting protrusion, which can effectively avoid the position deviation of the tab caused by the deviation of the switching piece, thereby preventing the overall position deviation of the electrode assembly and reducing the risk of short circuit between the electrode assembly and the shell. At the same time, the limiting protrusion can limit the position deviation of the switching piece in the process of being connected with the insulating piece and the cover body, thereby avoiding the interference between the switching piece and the cover body or the shell, reducing the probability of the cover body and the shell being overlapped, and further reducing the risk of short circuit between the cover body and the shell. Therefore, the limiting protrusion can reduce the probability of the cover body and the shell being overlapped through the switching piece, or reduce the probability of the electrode assembly and the shell being overlapped, thereby reducing the probability of short circuit of the battery monomer, and further improving the working performance of the battery monomer.

[0006] In some embodiments, the extending direction of the limiting protrusion is parallel to the side surface of the switching piece close to the edge of the insulating piece.

[0007] Thus, the movement of the adapter in the extension direction of the limiting protrusions can be effectively limited.

[0008] In some embodiments, the insulating member comprises a first side and a second side connected to the first side, the length of the first side is greater than the length of the second side; the limiting protrusions extend in a first direction, the first side is parallel to the side of the adapter close to the edge of the insulating member, and the first direction is parallel to the extension direction of the first side.

[0009] Thus, the extension design of the limiting protrusions can enhance the limiting effect of the limiting protrusions on the adapter in the first direction.

[0010] In some embodiments, the limiting protrusions extend in a second direction, the second side is parallel to the side of the adapter close to the edge of the insulating member, and the second direction is parallel to the extension direction of the second side.

[0011] Thus, the extension design of the limiting protrusions can enhance the limiting effect of the limiting protrusions on the adapter in the second direction.

[0012] In some embodiments, part of the limiting protrusions extend in a first direction, the first side is parallel to the side of the adapter close to the edge of the insulating member, and the other part of the limiting protrusions extend in a second direction, the second side is parallel to the side of the adapter close to the edge of the insulating member. The first direction is parallel to the extension direction of the first side, and the second direction is parallel to the extension direction of the second side.

[0013] Thus, by extending the limiting protrusions in the first direction and the second direction, the position deviation of the adapter during the connection with the insulating member and the cover can be more effectively limited. Since the first direction is parallel to the extension direction of the first side, and the second direction is parallel to the extension direction of the second side, this design enables the limiting protrusions to limit the adapter from multiple directions, thereby enhancing the limiting effect.

[0014] In some embodiments, the limiting protrusions are adjacent to the side of the adapter close to the second side, and the limiting protrusions extend in the second direction to limit the movement of the adapter towards the second side.

[0015] Thus, the limiting protrusions are adjacent to the side of the adapter close to the second side, and extend in the second direction, which can effectively limit the movement of the adapter towards the second side. This helps to reduce the probability of the cover and the shell being overlapped due to the deviation of the adapter, thereby reducing the risk of short circuit of the battery monomer.

[0016] In some embodiments, the insulating member is provided with a first through hole, the adapter includes an adapter body and a protruding portion, the protruding portion protrudes from a side of the adapter body facing the insulating member, the protruding portion is arranged in the first through hole and connected with the cover, and the protruding portion is adapted to the shape of the first through hole.

[0017] In this way, the protruding portion is arranged to enable the adapter to be accurately aligned with the first through hole of the insulating member during installation, thereby improving the installation accuracy of the adapter. Moreover, since the protruding portion is adapted to the shape of the first through hole, the protruding portion and the first through hole are more easily accurately aligned during assembly.

[0018] In some embodiments, the first through hole has a size K1 along the first direction, a size K2 along the second direction, the protruding portion has a size K3 along the first direction, and a size K4 along the second direction; the relationship between K1, K2, K3 and K4 is: K1-K3≤3mm, and K2-K4≤3mm.

[0019] In this way, by setting the above size relationship, the assembly problems caused by size mismatch can be reduced, thereby reducing the deviation or jamming of the adapter during assembly due to size difference, and improving the assembly efficiency.

[0020] In some embodiments, the protruding portion is circular in shape.

[0021] In this way, the manufacturing process of the circular protruding portion is relatively simple, easy to process and form. This design can reduce manufacturing cost, improve production efficiency, and at the same time ensure the consistency of product quality.

[0022] In some embodiments, the distance from the center of the first through hole to the side of the adapter close to the second edge is D1, the distance from the center of the protruding portion to the side of the limiting protrusion close to the adapter is D2; the relationship between D1, D2, K1 and K3 is: D2-D1≤K1-K3.

[0023] In this way, by setting the above size relationship, the accuracy of the adapter during installation is ensured. This design enables the adapter to be more accurately positioned when cooperating with the insulating member and the limiting protrusion, reducing assembly problems caused by positional deviation. This helps to reduce battery cell failures caused by improper installation or positional deviation of the adapter, and prolongs the service life of the battery cell.

[0024] In some embodiments, the limiting protrusion is arranged adjacent to the side of the adapter close to the first edge, and the limiting protrusion extends along the first direction to limit the movement of the adapter towards the first edge.

[0025] Thus, the limiting protrusion is arranged adjacent to the side of the adapter close to the first edge and extends in the first direction, which can effectively limit the movement of the adapter towards the first edge. This can effectively avoid the tab position deviation caused by the adapter deviation, thereby preventing the overall position deviation of the electrode assembly and reducing the risk of short circuit between the electrode assembly and the shell.

[0026] In some embodiments, the limiting protrusion comprises a first protrusion and a second protrusion, the first protrusion is arranged adjacent to the side of the adapter close to the first edge, and the first protrusion extends in the first direction to limit the movement of the adapter towards the first edge.

[0027] The second protrusion is arranged adjacent to the side of the adapter close to the second edge, and the second protrusion extends in the second direction to limit the movement of the adapter towards the second edge.

[0028] Thus, the first protrusion can effectively limit the movement of the adapter towards the first edge. This can effectively avoid the tab position deviation caused by the adapter deviation, thereby preventing the overall position deviation of the electrode assembly and reducing the risk of short circuit between the electrode assembly and the shell.

[0029] The second protrusion can effectively limit the movement of the adapter towards the second edge. This helps to reduce the probability of the cover and the shell overlapping due to the adapter deviation, thereby reducing the risk of short circuit of the battery cell.

[0030] By arranging the first protrusion and the second protrusion to limit the movement of the adapter towards the first edge and the second edge respectively, the deviation of the adapter can be more comprehensively limited. This design improves the limiting effect and ensures the stability of the adapter during the connection with the insulating piece and the cover.

[0031] In some embodiments, the limiting protrusion comprises a first portion, a second portion and a third portion, the first portion extends in the second direction, the second portion is angularly connected to one end of the first portion, and the third portion is angularly connected to the other end of the first portion.

[0032] The adapter comprises a first side, a second side and a third side, the first side is close to the second edge, the second side and the third side are located on opposite sides of the adapter and are close to the first edge, the first side is arranged adjacent to the first portion, the second side is arranged adjacent to the second portion, and the third side is arranged adjacent to the third portion.

[0033] Thus, by setting multiple parts on the limiting protrusion and respectively setting them adjacent to different sides of the adapter, the limiting of the adapter in multiple directions can be achieved. This design can effectively prevent the adapter from deviating in different directions, ensuring its stability during installation and use. Moreover, by setting multiple parts on the limiting protrusion to achieve multi-directional limiting, precise limiting of the adapter can be achieved without significantly increasing manufacturing costs.

[0034] In some embodiments, the limiting protrusion abuts the side of the adapter close to the edge of the insulating piece.

[0035] Thus, by directly abutting, the limiting protrusion can more effectively prevent the adapter from deviating during installation and use, ensuring the stability of its position.

[0036] In some embodiments, the limiting protrusion is symmetrically arranged about the center line of the insulating piece.

[0037] Thus, the symmetrically arranged limiting protrusion can make the adapter force uniform, thereby avoiding the adapter from deviating during contact with the limiting protrusion, ensuring the stability of the position of the adapter.

[0038] In some embodiments, in the direction away from the insulating piece, the surface of the limiting protrusion is lower than the surface of the adapter, or the surface of the limiting protrusion is flush with the surface of the adapter.

[0039] Thus, the limiting protrusion provides limiting function while not occupying too much space inside the battery monomer. This helps to optimize the space utilization inside the battery monomer, improve its energy density and overall performance.

[0040] In some embodiments, the battery monomer further comprises a pole post welded with the cover body, the cover body is provided with a second through hole, the adapter comprises an adapter body and a protruding part, the protruding part is protruding from the side of the adapter body facing the insulating piece, the protruding part is arranged in the second through hole and welded with the pole post.

[0041] Thus, by welding the protruding part with the pole post, the connection stability between the adapter and the pole post is enhanced. This helps to ensure the reliability of current transmission and reduce performance problems caused by loose connection. Moreover, the setting of the protruding part makes the connection between the adapter and the pole post more direct and simple. During assembly, the protruding part can be directly arranged in the second through hole and welded with the pole post, reducing the complex assembly steps and improving the assembly efficiency.

[0042] The battery device of the embodiments of the present application comprises the battery monomer of any one of the above embodiments.

[0043] Since the battery device includes the above-described battery cell, at least all the advantages of the above-described battery cell are included, and thus a detailed description thereof will not be repeated here.

[0044] The electric device of the embodiments of the present application includes the battery cell of any one of the above-described embodiments or the battery device described in the above-described embodiments.

[0045] Since the electric device includes the above-described battery cell or battery device, at least all the advantages of the above-described battery cell or battery device are included, and thus a detailed description thereof will not be repeated here.

[0046] The above description is only a summary of the technical solutions of the present application. In order to enable the technical means of the present application to be more clearly understood, and to be implemented according to the contents of the description, and in order to enable the above and other purposes, characteristics and advantages of the present application to be more apparent and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0047] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a description of the preferred embodiments, and are not meant to limit the present application. Moreover, the same reference numerals in all the drawings represent the same or similar elements. In the drawings:

[0048] Figure 1 is a structural schematic diagram of an electric device provided by some embodiments of the present application;

[0049] Figure 2 is a partial structural schematic diagram of a battery device provided by some embodiments of the present application;

[0050] Figure 3 is a structural schematic diagram of a battery cell provided by some embodiments of the present application;

[0051] Figure 4 is a structural schematic diagram of a battery cell of Figure 3 ;

[0052] Figure 5 is a sectional view of A-A direction of Figure 4 ;

[0053] Figure 6 is an enlarged view of a portion of Figure 5 ;

[0054] Figure 7 is a schematic diagram of the positional relationship between the adapter piece and the limiting protrusion provided by some embodiments of the present application;

[0055] Figure 8 is a schematic diagram of the positional relationship between the adapter piece and the limiting protrusion provided by some other embodiments of the present application;

[0056] Figure 9 is a schematic diagram of the positional relationship between the adapter piece and the limiting protrusion provided by some embodiments of the present application;

[0057] Figure 10 is a sectional view of the battery monomer in the B-B direction of Figure 5

[0058] Figure 11 is an enlarged view of the b part of Figure 10

[0059] Figure 12 is a partial structural schematic diagram of the battery monomer provided by some embodiments of the present application.

[0060] Explanation of Reference Signs:

[0061] Battery monomer 100; shell 10; cover 20; electrode assembly 30; tab 31; insulating piece 40; limiting protrusion 50; adapter piece 60; first edge 41; second edge 42; first via 43; adapter main body 61; protruding part 62; first protrusion 51; second protrusion 52; first part 53; second part 54; third part 55; first side surface 63; second side surface 64; third side surface 65; pole 70; first pole 71; second pole 72; second via 21; first adapter piece 66; second adapter piece 67; sealing piece 80; pressure relief piece 90; pressure relief protection piece 101; battery device 1000; power consuming device 2000; controller 2001; motor 2002; box 200; first box 201; first box 202. DETAILED DESCRIPTION

[0062] The embodiments of the technical solutions of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0063] 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 the present application belongs; the terms used herein are only for the purpose of describing specific embodiments and are 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 non-exclusive inclusion.

[0064] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is two or more, unless otherwise explicitly and specifically limited.​​

[0065] Reference within this document to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in an embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are they necessarily mutually exclusive of one another. It is expressly understood that any of the embodiments described herein can be combined with any of the other embodiments unless explicitly stated otherwise.

[0066] In the description of the embodiments of the present application, the term "and / or" is merely used to describe associated objects, that is, there can be three relationships, for example, A and / or B, which means that there are three cases of A alone, A and B together, and B alone. In addition, the character " / " in this document generally represents an "or" relationship between the front and rear associated objects.

[0067] In the description of the embodiments of the present application, the term "a plurality of" refers to two or more (including two), and similarly, "a plurality of groups" refers to two or more groups (including two groups), and "a plurality of pieces" refers to two or more pieces (including two pieces).

[0068] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the devices or elements 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 embodiments of the present application.

[0069] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing", and the like should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrated; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium; it can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0070] At present, from the development of market situation, the application of battery is more and more extensive. The battery is not only applied to the energy storage power supply system of hydropower, thermal power, wind power and solar power station, but also widely used in electric bicycles, electric motorcycles, electric vehicles and other electric vehicles, and aerospace and other fields. With the continuous expansion of the application field of battery, the demand of its market is also increasing.

[0071] The battery cell usually includes a cover, a shell, an electrode assembly, an insulating piece and a connecting piece. The main function of the insulating piece is to isolate the cover and the shell to prevent short circuit between them. The connecting piece is used to connect with the tab of the electrode assembly, so as to realize the current output of the electrode assembly.

[0072] In the manufacturing process of the battery cell, the connecting piece is first connected with the tab, and then connected with the insulating piece and the cover. However, in the process of connecting the connecting piece with the insulating piece and the cover, the connecting piece is easy to deviate. This deviation will cause the deviation of the tab position, and further cause the deviation of the overall position of the electrode assembly, increase the risk of short circuit between the electrode assembly and the shell. In addition, the deviation of the connecting piece may also cause the overlap of the cover and the shell, thereby causing short circuit and other problems, which seriously affects the working performance of the battery cell.

[0073] In order to solve the above problems, an improved battery cell design is proposed in the present application. Specifically, a limiting protrusion is arranged on the insulating piece, and the limiting protrusion is arranged adjacent to the side surface of the connecting piece. The design of the limiting protrusion can effectively limit the movement of the connecting piece in the process of connecting with the insulating piece and the cover, thereby avoiding the deviation of the tab position and the overall position of the electrode assembly caused by the deviation of the connecting piece. In this way, the present application can significantly reduce the risk of short circuit between the electrode assembly and the shell and the overlap of the cover and the shell, thereby improving the working performance of the battery cell.

[0074] Please refer to Figure 1 , Figure 1 is the structural schematic diagram of the power utilization device 2000 provided by some embodiments of the present application. The technical solutions described in the embodiments of the present application are applicable to various power utilization devices 2000 using the battery device 1000, for example, mobile phones, portable devices, notebook computers, electric vehicles, electric toys, electric tools, vehicles, ships and spacecraft, etc. For example, the spacecraft includes airplanes, rockets, space shuttles and spacecraft, etc.

[0075] The following embodiments are described for convenience with a power utilization device 2000 as a vehicle as an example.

[0076] The vehicle is provided with a battery apparatus 1000, which can be arranged at the bottom, head or tail of the vehicle. The battery apparatus 1000 can be used for power supply of the vehicle, for example, as the operating power source of the vehicle.

[0077] The vehicle can further include a controller 2001 and a motor 2002, the controller 2001 being used to control the battery apparatus 1000 to supply power to the motor 2002, for example, for the power demand of the vehicle during starting, navigation and driving.

[0078] In the embodiments of the present application, the battery apparatus 1000 can not only be used as the operating power source of the vehicle, but also as the driving power source of the vehicle, replacing or partially replacing the fuel or natural gas to provide driving power for the vehicle.

[0079] Please refer to Figure 2 , Figure 2 is a partial structure diagram of the battery apparatus 1000 provided by some embodiments of the present application. The battery apparatus 1000 mentioned in the embodiments of the present application can include one or more battery cell 100 assemblies for providing voltage and capacity. The battery cell 100 assembly can include a plurality of battery cells 100 connected in series, parallel or mixed connection through busbar components.

[0080] In the embodiments of the present application, the battery cell 100 can be a secondary battery, which refers to a battery cell 100 that can be activated by charging after discharging.

[0081] The battery cell 100 can be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a lithium metal battery, a sodium metal battery, a lithium sulfur battery, a magnesium ion battery, a nickel hydrogen battery, a nickel cadmium battery, a lead-acid battery, etc., which is not limited in the embodiments of the present application.

[0082] In some embodiments, the battery cell 100 assembly is usually formed by arranging a plurality of battery cells 100.

[0083] As an example, the battery cell 100 assembly can be a battery module formed by arranging and fixing a plurality of battery cells 100 into an independent module. As an example, the battery module can be formed by binding a plurality of battery cells 100 with a cable tie.

[0084] In some embodiments, the battery device 1000 can be a battery pack, which includes a box 200 and one or more battery cell 100 assemblies accommodated in the box 200.

[0085] As an example, the battery cell 100 assembly can be a battery module, which can be accommodated in the box 200 by fixing the battery module in the box 200.

[0086] As an example, the box 200 can include a first box 201 and a second box 202. The first box 201 and the second box 202 are buckled so that an enclosed space is formed inside the box 200 to accommodate the battery cell 100 assembly. Here, the enclosed means covered or closed, which can be sealed or unsealed. The first box 201 can be a top cover or a bottom plate.

[0087] As an example, the box 200 can include a top cover, a frame and a bottom plate. The top cover and the bottom plate are respectively connected with the frame so that an enclosed space is formed inside the box 200 to accommodate the battery cell 100 assembly.

[0088] As an example, the battery cell 100 assembly can also be accommodated in the box 200 by fixing a plurality of battery cells 100 directly to the box 200.

[0089] In some embodiments, the box 200 can be part of a chassis structure of a vehicle. For example, part of the box 200 can be at least part of a floor of the vehicle, or part of the box 200 can be at least part of a cross beam and a longitudinal beam of the vehicle.

[0090] In some embodiments, the battery device 1000 can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0091] Please refer to Figures 3 to 6 . Figure 3 is a structural schematic diagram of the battery cell 100 provided by some embodiments of the present application; Figure 4 is a schematic diagram of another view of the battery cell 100 of Figure 3 ; Figure 5 is a sectional view of the A-A direction of the battery cell 100 of Figure 4 ; Figure 6 is a sectional view of the B-B direction of the battery cell 100 of Figure 5The battery cell 100 of the embodiment of the present application comprises a shell 10, a cover 20, an electrode assembly 30, an insulating piece 40 and an adapter 60. The electrode assembly 30 is arranged in the shell 10, the electrode assembly 30 comprises a tab 31; the insulating piece 40 is arranged on the side of the cover 20 facing the electrode assembly 30, the insulating piece 40 is provided with a limiting protrusion 50 on the side facing the electrode assembly 30; the adapter 60 is at least partially arranged between the electrode assembly 30 and the insulating piece 40, one side of the adapter 60 is connected with the tab 31, the side of the adapter 60 facing away from the tab 31 is connected with the cover 20 and the insulating piece 40, and the limiting protrusion 50 is arranged adjacent to the side of the adapter 60 close to the edge of the insulating piece 40, so as to limit the movement of the adapter 60 towards the edge of the insulating piece 40.

[0092] Specifically, the shell 10 is a component for cooperating with the cover 20 to form an internal environment of the battery cell 100, wherein the formed internal environment can be used to accommodate the electrode assembly 30, the electrolyte and other components. The shell 10 and the cover 20 can be independent components, and an opening can be provided on the shell 10, and the cover 20 is made to cover the opening to form the internal environment of the battery cell 100. Without limitation, the cover 20 and the shell 10 can also be integrated, specifically, the cover 20 and the shell 10 can first form a common connecting surface before other components enter the shell, and when it is necessary to seal the inside of the shell 10, the cover 20 is made to cover the shell 10.

[0093] The shell 10 can be of various shapes and sizes, such as a cuboid, a cylinder, a hexagonal prism, etc. Specifically, the shape of the shell 10 can be determined according to the specific shape and size of the electrode assembly 30. The material of the shell 10 can be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and the embodiments of the present application do not make special limitations thereon.

[0094] The electrode assembly 30 is a component in which electrochemical reactions occur in the battery cell 100. One or more electrode assemblies 30 can be contained in the shell 10. The electrode assembly 30 can be formed by winding or stacking a positive electrode sheet and a negative electrode sheet, and a separator is usually arranged between the positive electrode sheet and the negative electrode sheet.

[0095] The positive electrode sheet and the negative electrode sheet have a portion with active material constituting the main body of the electrode assembly 30, and a portion without active material constituting the tab 31 respectively. The tab 31 can be divided into a positive tab 31 and a negative tab 31, and the positive tab 31 and the negative tab 31 can be located at one end of the main body together, or at two ends of the main body respectively. The tab 31 is used to conduct current and realize the connection between the electrode assembly 30 and the external circuit.

[0096] The insulating member 40 is a component for isolating current. The insulating member 40 can be used to isolate the electrode assembly 30 from the cover 20, and the insulating member 40 can also be used to isolate the electrode assembly 30 from the housing 10 to reduce the risk of short circuit. The insulating member 40 can be plastic, rubber, etc.

[0097] The limiting protrusion 50 is a protruding structure provided on the insulating member 40, which is used to limit the movement of the adapter 60. The limiting protrusion 50 is provided adjacent to the side surface of the adapter 60, limiting the movement of the adapter 60 towards the edge of the insulating member 40, and preventing the adapter 60 from being offset.

[0098] The limiting protrusion 50 can be a circular protrusion, a square protrusion, a long strip-shaped protrusion, or other shaped protruding structures. The number of limiting protrusions 50 can be one or more, and multiple limiting protrusions 50 can enhance the limiting effect.

[0099] The limiting protrusion 50 can be integrally formed with the insulating member 40. For example, injection molding or die molding processes can be used to form the insulating member 40 and the limiting protrusion 50 at one time. The one-piece forming process simplifies the manufacturing process and reduces the assembly steps. In the production process, the limiting protrusion 50 does not need to be manufactured separately and assembled with the insulating member 40, thereby improving the production efficiency and reducing the manufacturing cost.

[0100] The limiting protrusion 50 can also be formed separately from the insulating member 40. For example, injection molding, die molding or mechanical processing processes can be used to manufacture the insulating member 40 and the limiting protrusion 50 respectively, and the limiting protrusion 50 is fixed on the insulating member 40 by bonding, ultrasonic welding or other methods to ensure the connection between the two is firm.

[0101] The adapter 60 is a component for connecting the electrode assembly 30 and the cover 20. For example, the cover 20 can be provided with an electrode terminal, and the adapter 60 can be connected to the bottom of the electrode terminal. The adapter 60 is connected to the tab 31 to achieve electrical connection between the electrode assembly 30 and the cover 20. The adapter 60 can be connected to the insulating member 40 and the cover 20 to ensure structural stability.

[0102] The adjacent arrangement means that the limiting protrusion 50 is close to or in contact with the side surface of the adapter 60 near the edge of the insulating member 40. The distance of the adjacent arrangement can be adjusted according to actual needs to ensure that the limiting protrusion 50 can provide effective limiting effect when the adapter 60 moves. For example, the distance between the limiting protrusion 50 and the side surface of the adapter 60 can range from 0mm to 1mm, etc.

[0103] In the battery monomer 100 of the embodiment of the utility model, the position offset of adapter 60 is limited by setting limiting protrusion 50, which can effectively avoid the position offset of tab 31 caused by the offset of adapter 60, and further prevent the overall position offset of electrode assembly 30, and reduce the risk of short circuit of electrode assembly 30 and shell 10.

[0104] Meanwhile, limiting protrusion 50 can limit the position offset of adapter 60 during the connection with insulating piece 40 and cover 20, thereby avoiding the interference between adapter 60 and cover 20 or shell 10, reducing the probability of the overlap of cover 20 and shell 10, and further reducing the risk of short circuit of cover 20 and shell 10. Therefore, limiting protrusion 50 can reduce the probability of the overlap of cover 20 and shell 10 through adapter 60, or reduce the probability of the overlap of electrode assembly 30 and shell 10, thereby reducing the probability of short circuit of battery monomer 100, and further improving the working performance of battery monomer 100.

[0105] In some embodiments, the extension direction of limiting protrusion 50 is parallel to the side of adapter 60 close to the edge of insulating piece 40.

[0106] In this way, the movement of adapter 60 in the extension direction of limiting protrusion 50 can be effectively limited.

[0107] In some embodiments, insulating piece 40 includes first edge 41 and second edge 42 connected with first edge 41, the length of first edge 41 is greater than the length of second edge 42; limiting protrusion 50 extends along first direction F1, first edge 41 is parallel to the side of adapter 60 close to the edge of insulating piece 40, and first direction F1 is parallel to the extension direction of first edge.

[0108] Specifically, first edge 41 can be the long edge of insulating piece 40, and second edge 42 can be the short edge of insulating piece 40. The ratio of the lengths of first edge 41 and second edge 42 can be set arbitrarily according to requirements.

[0109] In this way, the extension design of limiting protrusion 50 can enhance the limiting effect of limiting protrusion 50 on adapter 60 in first direction F1.

[0110] Please refer to Figure 7 , Figure 7 is the position relationship diagram of adapter and limiting protrusion 50 provided by some embodiments of the application. In some embodiments, limiting protrusion 50 extends along second direction F2, second edge 42 is parallel to the side of adapter 60 close to the edge of insulating piece 40, and second direction F2 is parallel to the extension direction of second edge 42.

[0111] In this way, the extension design of limiting protrusion 50 can enhance the limiting effect of limiting protrusion 50 on adapter 60 in second direction F2.

[0112] Referring to Figure 8 , Figure 8 is a schematic diagram of the positional relationship between the adapter piece and the limiting protrusions 50 according to some embodiments of the present application. In some embodiments, a portion of the limiting protrusions 50 extends along a first direction F1, and the first edge 41 is parallel to the side of the adapter piece 60 adjacent to the edge of the insulating piece 40. Another portion of the limiting protrusions 50 extends along a second direction F2, and the second edge 42 is parallel to the side of the adapter piece 60 adjacent to the edge of the insulating piece 40. The first direction F1 is parallel to the extension direction of the first edge 41, and the second direction F2 is parallel to the extension direction of the second edge 42.

[0113] In this way, by extending the limiting protrusions 50 along the first direction F1 and the second direction F2, the positional deviation of the adapter piece 60 during the connection with the insulating piece 40 and the cover 20 can be more effectively limited. Since the first direction F1 is parallel to the extension direction of the first edge 41, and the second direction F2 is parallel to the extension direction of the second edge 42, this design enables the limiting protrusions 50 to limit the adapter piece 60 from multiple directions, thereby enhancing the limiting effect.

[0114] Referring to Figure 7 In some embodiments, the limiting protrusions 50 are arranged adjacent to the side of the adapter piece 60 adjacent to the second edge 42, and the limiting protrusions 50 extend along the second direction F2 to limit the movement of the adapter piece 60 towards the second edge 42.

[0115] Specifically, the limiting protrusions 50 can be long strip-shaped structures extending along the second direction F2. The limiting protrusions 50 can extend to the edge of the insulating piece 40, or the length of the limiting protrusions 50 can be equal to the length of the second edge 42. In this way, the movement of the adapter piece 60 towards the second edge 42 can be completely limited.

[0116] In this way, the limiting protrusions 50 are arranged adjacent to the side of the adapter piece 60 adjacent to the second edge 42 and extend along the second direction F2, which can effectively limit the movement of the adapter piece 60 towards the second edge 42. This helps to reduce the probability of the cover 20 and the shell 10 being overlapped due to the deviation of the adapter piece 60, thereby reducing the risk of short circuit of the battery cell 100.

[0117] Referring to Figure 6 In some embodiments, the insulating piece 40 is provided with a first via hole 43, the adapter piece 60 includes an adapter body 61 and a protruding portion 62, the protruding portion 62 is protruded from the side of the adapter body 61 facing the insulating piece 40, the protruding portion 62 is arranged in the first via hole 43 and connected with the cover 20, and the shape of the protruding portion 62 is adapted to the shape of the first via hole 43.

[0118] Specifically, the first via hole 43 can be a through hole penetrating the insulating piece 40. The shape of the first via hole 43 can be a regular-shaped hole such as a circular hole, a square hole, an oval hole, etc., or an irregular-shaped hole.

[0119] The adapter body 61 can be connected with the tab 31 to realize the current output of the electrode assembly 30. The adapter body 61 can be integrally formed with the protruding part 62 to improve the structural strength of the protruding part 62. The current of the adapter body 61 can be transmitted to the protruding part 62.

[0120] The protruding part 62 can be a protruding structure of different shapes such as a circular protrusion, a square protrusion, a triangular protrusion, etc. The size and shape of the protruding part 62 can be optimally designed according to the size and shape of the first via hole 43 to ensure that the protruding part 62 can be smoothly arranged and welded. For example, for the circular first via hole 43, the protruding part 62 can be adaptively arranged as a circular shape. The connection between the protruding part 62 and the cover 20 can be indirect connection. For example, the protruding part 62 can be connected with the cover 20 through an electrode terminal.

[0121] In this way, the arrangement of the protruding part 62 enables the adapter 60 to be accurately aligned with the first via hole 43 of the insulating piece 40 through the protruding part 62 during the installation process, thereby improving the installation accuracy of the adapter 60. Moreover, since the protruding part 62 is adapted to the shape of the first via hole 43, the protruding part 62 and the first via hole 43 are more easily accurately aligned during assembly.

[0122] Please refer to Figure 6 and Figure 7 In some embodiments, the size of the first via hole 43 along the first direction F1 is K1, the size of the first via hole 43 along the second direction F2 is K2, the size of the protruding part 62 along the first direction F1 is K3, and the size of the protruding part 62 along the second direction F2 is K4; the relationship between K1, K2, K3 and K4 is: K1-K3≤3mm, and K2-K4≤3mm.

[0123] Specifically, for the circular first via hole 43, K1 and K2 can both be the diameter of the first via hole 43. For the first via hole 43 of other shapes, K1 can be the minimum distance between the hole walls oppositely arranged along the first direction F1. K2 can be the minimum distance between the hole walls oppositely arranged along the second direction F2.

[0124] For the circular protruding part 62, K3 and K4 can both be the diameter of the protruding part 62. For the protruding part 62 of other shapes, K3 can be the minimum distance between the two sides oppositely arranged along the first direction F1. K4 can be the minimum distance between the two sides oppositely arranged along the second direction F2.

[0125] Therefore, by setting the above size relationship, the assembly problem caused by size mismatch can be reduced, so that the deviation or jam of the adapter 60 caused by size difference during assembly can be reduced, and the assembly efficiency can be improved.

[0126] Referring to Figure 7 In some embodiments, the protrusion 62 is circular in shape.

[0127] Therefore, the manufacturing process of the circular protrusion 62 is relatively simple and easy to process and form. This design can reduce manufacturing cost, improve production efficiency, and at the same time ensure the consistency of product quality.

[0128] Referring to Figure 7 In some embodiments, the distance from the center of the first via 43 to the side of the adapter 60 close to the second edge 42 is D1, and the distance from the center of the protrusion 62 to the side of the limiting protrusion 50 close to the adapter 60 is D2; the relationship between D1, D2, K1 and K3 is: D2-D1≤K1-K3.

[0129] Specifically, the center of the first via 43 refers to the geometric center of the first via 43. For example, for a circular first via 43, the center of the first via 43 refers to the center of the circle of the first via 43.

[0130] The center of the protrusion 62 refers to the geometric center of the protrusion 62. For example, for a circular protrusion 62, the center of the protrusion 62 refers to the center of the circle of the protrusion 62.

[0131] The center of the first via 43 can coincide with the center of the protrusion 62, or can be offset from the center of the protrusion 62 by a certain distance. The side of the adapter 60 close to the second edge 42 can be oppositely arranged relative to the side of the limiting protrusion 50 close to the adapter 60. The side of the adapter 60 close to the second edge 42 can be attached or spaced apart from the side of the limiting protrusion 50 close to the adapter 60.

[0132] Therefore, by setting the above size relationship, the accuracy of the adapter 60 during installation is ensured. This design allows the adapter 60 to be more accurately positioned when cooperating with the insulating member 40 and the limiting protrusion 50, reducing assembly problems caused by positional deviation. This helps to reduce battery cell 100 failure caused by improper installation or positional deviation of the adapter 60, and prolongs the service life of the battery cell 100.

[0133] Referring to Figure 8 In some embodiments, the limiting protrusion 50 is arranged adjacent to the side of the adapter 60 close to the first edge 41, and the limiting protrusion 50 extends in the first direction F1 to limit the movement of the adapter 60 towards the first edge 41.

[0134] Specifically, the limiting protrusion 50 can be a strip-shaped structure extending along the first direction F1.

[0135] In this way, the limiting protrusion 50 is arranged adjacent to the side of the adapter 60 close to the first edge 41 and extends along the first direction F1, which can effectively limit the movement of the adapter 60 towards the first edge 41. This can effectively avoid the position deviation of the tab 31 caused by the deviation of the adapter 60, thereby preventing the overall position deviation of the electrode assembly 30 and reducing the risk of short circuit between the electrode assembly 30 and the shell 10.

[0136] Please refer to Figure 8 In some embodiments, the limiting protrusion 50 includes a first protrusion 51 and a second protrusion 52, the first protrusion 51 is arranged adjacent to the side of the adapter 60 close to the first edge 41, and the first protrusion 51 extends along the first direction F1 to limit the movement of the adapter 60 towards the first edge 41.

[0137] The second protrusion 52 is arranged adjacent to the side of the adapter 60 close to the second edge 42, and the second protrusion 52 extends along the second direction F2 to limit the movement of the adapter 60 towards the second edge 42.

[0138] Specifically, the first protrusion 51 can be a round protrusion, a square protrusion, a triangular protrusion, or other different shapes of protrusion structures. The second protrusion 52 can be a round protrusion, a square protrusion, a triangular protrusion, or other different shapes of protrusion structures. The shape of the first protrusion 51 can be the same as or different from the shape of the second protrusion 52. For example, the first protrusion 51 can be a strip-shaped structure extending along the first direction F1. The second protrusion 52 can be a strip-shaped structure extending along the second direction F2.

[0139] As an example, please refer to Figure 8 For one adapter 60, the number of first protrusions 51 can be two, and the number of second protrusions 52 can be one. The two first protrusions 51 can be arranged at intervals on both sides of the adapter 60.

[0140] In this way, the first protrusion 51 can effectively limit the movement of the adapter 60 towards the first edge 41. This can effectively avoid the position deviation of the tab 31 caused by the deviation of the adapter 60, thereby preventing the overall position deviation of the electrode assembly 30 and reducing the risk of short circuit between the electrode assembly 30 and the shell 10.

[0141] The second protrusion 52 can effectively limit the movement of the adapter 60 towards the second edge 42. This can help to reduce the probability of the cover 20 and the shell 10 being overlapped due to the deviation of the adapter 60, thereby reducing the risk of short circuit of the battery monomer 100.

[0142] By setting the first protrusion 51 and the second protrusion 52 to limit the movement of the adapter 60 towards the first edge 41 and the second edge 42 respectively, the deviation of the adapter 60 can be more comprehensively limited. This design improves the limiting effect and ensures the stability of the adapter 60 during the connection with the insulating piece 40 and the cover 20.

[0143] Please refer to Figure 9 , Figure 9 is a schematic diagram of the position relationship between the adapter piece and the limiting protrusion 50 provided by some embodiments of the present application. In some embodiments, the limiting protrusion 50 includes a first portion 53, a second portion 54 and a third portion 55, the first portion 53 extends along the second direction F2, the second portion 54 is connected to one end of the first portion 53 at an angle, and the third portion 55 is connected to the other end of the first portion 53 at an angle.

[0144] The adapter 60 includes a first side 63, a second side 64 and a third side 65, the first side 63 is close to the second edge 42, the second side 64 and the third side 65 are located on the opposite sides of the adapter 60 and are close to the first edge 41, the first side 63 is adjacent to the first portion 53, the second side 64 is adjacent to the second portion 54, and the third side 65 is adjacent to the third portion 55.

[0145] For example, the insulating piece 40 can be rectangular. The insulating piece 40 can include two first edges 41 opposite along the second direction F2. The second side 64 can be close to one of the first edges 41. The third side 65 can be close to the other first edge 41.

[0146] The first side 63 is adjacent to the first portion 53 of the limiting protrusion 50, for limiting the movement of the adapter 60 towards the second edge 42. The second side 64 is adjacent to the second portion 54 of the limiting protrusion 50, for limiting the movement of the adapter 60 towards one of the first edges 41. The third side 65 is adjacent to the third portion 55 of the limiting protrusion 50, for limiting the movement of the adapter 60 towards the other first edge 41.

[0147] In this way, by setting multiple portions on the limiting protrusion 50 and respectively adjacent to different sides of the adapter 60, the limiting of the adapter 60 in multiple directions can be achieved. This design can effectively prevent the deviation of the adapter 60 in different directions and ensure its stability during installation and use. Moreover, by setting multiple portions on the limiting protrusion 50 to achieve multi-directional limiting, the precise limiting of the adapter 60 can be achieved without significantly increasing the manufacturing cost.

[0148] Please refer to Figure 7 , Figure 8 and Figure 9In some embodiments, the limiting protrusion 50 abuts against the side of the adapter 60 close to the edge of the insulating member 40.

[0149] In this way, by directly abutting, the limiting protrusion 50 can more effectively prevent the adapter 60 from being deviated during installation and use, ensuring the stability of its position.

[0150] Please refer to Figure 7 , Figure 8 and Figure 9 In some embodiments, the limiting protrusion 50 is symmetrically arranged about the center line z of the insulating member 40.

[0151] Specifically, for one limiting protrusion 50, two parts of the limiting protrusion 50 located on both sides of the center line z of the insulating member 40 are symmetrically arranged. For multiple limiting protrusions 50, two or two groups of limiting protrusions 50 located on both sides of the center line z of the insulating member 40 are symmetrically arranged.

[0152] It should be noted that the center line z of the insulating member 40 is shown by a dashed line in the figure, but this is only a schematic for easy understanding and cannot be regarded as a limitation on the embodiments of the present application.

[0153] In this way, the symmetrically arranged limiting protrusion 50 can make the adapter 60 bear force evenly, thereby avoiding the adapter 60 from being deviated during contact with the limiting protrusion 50, ensuring the stability of the position of the adapter 60.

[0154] Please refer to Figure 6 In some embodiments, in the direction F3 away from the insulating member 40, the surface of the limiting protrusion 50 is lower than the surface of the adapter 60, or the surface of the limiting protrusion 50 is flush with the surface of the adapter 60.

[0155] In this way, the limiting protrusion 50 can provide limiting function while not occupying too much space inside the battery monomer 100. This helps to optimize the space utilization inside the battery monomer 100, improve its energy density and overall performance.

[0156] Please refer to Figure 6 , Figure 10 and Figure 11 , Figure 10 is a sectional view of the battery monomer 100 of Figure 5 in the B-B direction; Figure 11 is an enlarged view of the b part of the battery monomer 100 of Figure 10 In some embodiments, the battery monomer 100 further comprises a pole 70, the pole 70 is welded with the cover 20, the cover 20 is provided with a second through hole 21, the adapter 60 comprises an adapter main body 61 and a protruding part 62, the protruding part 62 is protruded on the side of the adapter main body 61 facing the insulating member 40, the protruding part 62 is arranged in the second through hole 21 and welded with the pole 70.

[0157] Specifically, the pole 70 can be a round pole 70, a square pole 70, or a pole 70 of other shapes. The pole 70 can be manufactured using a material with good thermal conductivity, such as copper, aluminum, or other metal alloys. In the same battery cell 100, poles 70 of different materials can be adopted. For example, the battery cell 100 includes copper poles 70 and aluminum poles 70 arranged at intervals to adapt to the output of the negative and positive poles of the battery cell 100. The pole 70 can be the main body part of the electrode terminal described above.

[0158] Referring to Figure 12 , Figure 12 is a partial structure diagram of the battery cell 100 provided by some embodiments of the present application. The pole 70 can include a first pole 71 and a second pole 72. The first pole 71 and the second pole 72 can be welded on the cover 20 at intervals. The first pole 71 and the second pole 72 are different in polarity. For example, the first pole 71 can be a positive pole 70. The second pole 72 can be a negative pole 70. The positive pole 70 is a metal component for outputting a positive current in the battery cell 100, which can be made of copper or copper alloy. The positive pole 70 can be connected to the adapter 60 of the positive electrode assembly 30 to realize the output of the positive current.

[0159] The negative pole 70 is a metal component for outputting a negative current in the battery cell 100, which can be made of copper or copper alloy. The negative pole 70 is connected to the adapter 60 of the negative electrode assembly 30 to realize the output of the negative current.

[0160] The adapter 60 can include a first adapter 66 and a second adapter 67. The first adapter 66 can be used to connect the positive electrode assembly 30 and the positive pole 70, which can be made of aluminum or aluminum alloy. The first adapter 66 is connected to the tab 31 of the positive electrode assembly 30 to realize the transmission of the positive current, and is connected to the positive pole 70 to output the current to the external circuit.

[0161] The second adapter 67 can be used to connect the negative electrode assembly 30 and the negative pole 70, which can be made of copper or copper alloy. The second adapter 67 is connected to the tab 31 of the negative electrode assembly 30 to realize the transmission of the negative current, and is connected to the negative pole 70 to output the current to the external circuit.

[0162] The second via hole 21 can be a through hole through the cover 20. The second via hole 21 can be a circular hole, a square hole, an oval hole, or a hole of other shapes. The shape of the second via hole 21 can be adapted to the shape of the protruding part 62 to facilitate the welding of the protruding part 62 and the pole 70.

[0163] In this way, the protrusion 62 is fixed to the pole 70 by welding, enhancing the stability of the connection between the adapter 60 and the pole 70. This helps to ensure the reliability of current transmission and reduce performance problems caused by loose connections. Moreover, the protrusion 62 makes the connection between the adapter 60 and the pole 70 more direct and simple. During assembly, the protrusion 62 can be directly inserted into the second via hole 21 and welded to the pole 70, reducing complex assembly steps and improving assembly efficiency.

[0164] Referring to Figure 11 and Figure 12 In some embodiments, a seal 80 can be provided between the hole wall of the second via hole 21 and the protrusion 62. The seal 80 not only seals the gap between the insulating member 40 and the protrusion 62, but also isolates the protrusion 62 and the insulating member 40. The seal 80 can be a sealing ring or a sealing glue layer coated on the hole wall of the second via hole 21. For example, the seal 80 can be a sealing ring made of rubber, plastic, or the like.

[0165] Referring to Figure 12 In some embodiments, the battery cell 100 can further include a pressure relief member 90 installed on the cover 20 of the battery cell 100 and communicating with the electrolyte and gas cavity inside the battery.

[0166] The pressure relief member 90 can be an explosion-proof valve or a notch provided on the cover 20. For example, the pressure relief member 90 can be an explosion-proof sheet, which can be made of a thin metal sheet and has a certain strength and elasticity. When abnormal conditions (such as overcharging, over-discharging, short circuit, etc.) occur in the battery cell 100, a large amount of gas will be generated inside the battery, causing the internal pressure to rise rapidly. The explosion-proof sheet can automatically open when the pressure reaches a certain threshold, releasing the internal gas and preventing the battery from exploding due to excessive pressure.

[0167] The pressure relief protection member 101 can prevent external objects (such as foreign matter, dust, etc.) from entering the opening mechanism of the pressure relief member 90, avoiding false triggering of the pressure relief member 90 under normal working conditions. For example, during transportation and installation of the battery cell 100, the pressure relief protection member 101 can prevent the pressure relief member 90 from being accidentally triggered, ensuring the safety of the battery before use.

[0168] The pressure relief protection member 101 can be an explosion-proof sheet protection patch. The explosion-proof sheet protection patch can protect the surface of the explosion-proof sheet, preventing it from being physically damaged (such as scratches, wear, etc.), and ensuring that the explosion-proof sheet can work normally when needed. The explosion-proof sheet protection patch can be designed as a detachable structure, which is convenient to remove after the installation of the battery cell 100 is completed, ensuring that the function of the explosion-proof sheet is not affected.

[0169] Referring to Figure 6 and Figure 8In one specific embodiment, the battery cell 100 comprises a shell 10, a cover 20, an electrode assembly 30, an insulating piece 40, a pole 70 and an adapter 60: the electrode assembly 30 is arranged in the shell 10, the electrode assembly 30 comprises a tab 31. The insulating piece 40 is arranged on the side of the cover 20 facing the electrode assembly 30, and the insulating piece 40 is provided with a limiting protrusion 50 on the side facing the electrode assembly 30.

[0170] The adapter 60 is at least partially arranged between the electrode assembly 30 and the insulating piece 40, and one side of the adapter 60 is connected with the tab 31. The pole 70 is welded with the cover 20, the cover 20 is provided with a second through hole 21, the adapter 60 comprises an adapter body 61 and a protruding part 62, the protruding part 62 protrudes from the side of the adapter body 61 facing the insulating piece 40, the protruding part 62 is arranged in the second through hole 21 and is welded with the pole 70.

[0171] The limiting protrusion 50 comprises a first protrusion 51 and a second protrusion 52, the first protrusion 51 abuts against the side of the adapter 60 close to the first edge 41, and the first protrusion 51 extends along the first direction F1 to limit the movement of the adapter 60 towards the first edge 41.

[0172] The second protrusion 52 abuts against the side of the adapter 60 close to the second edge 42, and the second protrusion 52 extends along the second direction F2 to limit the movement of the adapter 60 towards the second edge 42.

[0173] One adapter 60 is provided with two first protrusions 51 and one second protrusion 52. The two first protrusions 51 are respectively arranged on the opposite sides of the adapter 60 along the second direction F2. Moreover, the two first protrusions 51 are symmetrically arranged about the center line of the insulating piece 40. The second protrusion 52 is symmetrically arranged on the part of the insulating piece 40 on both sides of the center line.

[0174] In the direction F3 away from the insulating piece 40, the surfaces of the first protrusion 51 and the second protrusion 52 are flush with the surface of the adapter 60.

[0175] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the description of the present application. Especially, as long as there is no structural conflict, each technical feature mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized by, The battery cell comprises: a shell; a cover; an electrode assembly arranged in the shell, the electrode assembly comprising a tab; an insulating piece arranged on a side of the cover facing the electrode assembly, the insulating piece being provided with a limiting protrusion on a side facing the electrode assembly; an adapter piece arranged at least partially between the electrode assembly and the insulating piece, one side of the adapter piece being connected with the tab, a side of the adapter piece facing away from the tab being connected with both the cover and the insulating piece, the limiting protrusion being arranged adjacent to a side of the adapter piece close to the edge of the insulating piece, for limiting movement of the adapter piece towards the edge of the insulating piece.

2. The battery cell of claim 1, wherein, The extending direction of the limiting protrusion is parallel to the side of the adapter piece close to the edge of the insulating piece.

3. The battery cell of claim 2, wherein, The insulating piece comprises a first edge and a second edge connected with the first edge, the length of the first edge being greater than the length of the second edge; the limiting protrusion extends in a first direction, the first edge being parallel to the side of the adapter piece close to the edge of the insulating piece; and / or, the limiting protrusion extends in a second direction, the second edge being parallel to the side of the adapter piece close to the edge of the insulating piece; The first direction is parallel to the extending direction of the first edge, and the second direction is parallel to the extending direction of the second edge.

4. The battery cell of claim 3, wherein, The limiting protrusion is arranged adjacent to the side of the adapter piece close to the second edge, and the limiting protrusion extends in the second direction, for limiting movement of the adapter piece towards the second edge.

5. The battery cell of claim 4, wherein, The insulating piece is provided with a first via hole, the adapter piece comprises an adapter main body and a protruding portion, the protruding portion being protruded on a side of the adapter main body facing the insulating piece, the protruding portion being arranged in the first via hole and connected with the cover, and the shape of the protruding portion is adapted to the shape of the first via hole.

6. The battery cell of claim 5, wherein, The size of the first via hole in the first direction is K1, the size of the first via hole in the second direction is K2, the size of the protruding portion in the first direction is K3, and the size of the protruding portion in the second direction is K4; The relationship between K1, K2, K3 and K4 is: K1-K3≤3mm, and K2-K4≤3mm.

7. The battery cell of claim 6, wherein, The shape of the protruding portion is circular.

8. The battery cell of claim 6, wherein, The distance from the center of the first via hole to the side of the adapter piece close to the second edge is D1, and the distance from the center of the protruding portion to the side of the limiting protrusion close to the adapter piece is D2; the relationship between D1, D2, K1 and K3 is: D2-D1≤K1-K3.

9. The battery cell of claim 3, wherein, The limiting protrusion is arranged adjacent to the side of the adapter piece close to the first edge, and the limiting protrusion extends in the first direction, for limiting movement of the adapter piece towards the first edge.

10. The battery cell of claim 3, wherein, The limiting protrusion comprises a first protrusion and a second protrusion, the first protrusion is arranged adjacent to the side of the adapter piece close to the first edge, and the first protrusion extends in the first direction, for limiting movement of the adapter piece towards the first edge; The second protrusion is adjacent to the side of the adapter close to the second edge, and extends in the second direction to limit movement of the adapter towards the second edge.

11. The battery cell of claim 3, wherein, The limiting protrusion comprises a first part, a second part and a third part, the first part extends in the second direction, the second part is connected to one end of the first part at an angle, and the third part is connected to the other end of the first part at an angle. The adapter comprises a first side, a second side and a third side, the first side is close to the second edge, the second side and the third side are located on opposite sides of the adapter and are close to the first edge, the first side is adjacent to the first part, the second side is adjacent to the second part, and the third side is adjacent to the third part.

12. The battery cell of claim 1, wherein, The limiting protrusion abuts the side of the adapter close to the edge of the insulating member.

13. The battery cell of claim 1, wherein, The limiting protrusion is symmetrically arranged about the center line of the insulating member.

14. The battery cell of claim 1, wherein, In a direction away from the insulating member, the surface of the limiting protrusion is lower than the surface of the adapter, or the surface of the limiting protrusion is flush with the surface of the adapter.

15. The battery cell of claim 1, wherein, The battery monomer further comprises a pole column, the pole column is welded with the cover body, the cover body is provided with a second through hole, the adapter comprises an adapter main body and a protruding part, the protruding part is protruded on the side of the adapter main body towards the insulating member, the protruding part is arranged in the second through hole and welded with the pole column.

16. A battery device characterized by comprising: The battery device comprises the battery monomer of any one of claims 1-15.

17. An electrical device, comprising: The power utilization device comprises the battery monomer of any one of claims 1-15 or the battery device of claim 16.

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