Battery monomer, battery device and electric equipment

Abstract

The invention discloses a battery monomer, a battery device and electric equipment. The battery cell comprises a housing, an electrode assembly, a first adapter, a first electrode terminal, a sealing member and a first conductive member. The first adapter is connected to the first tab of the electrode assembly. The first electrode terminal is fixedly arranged on the wall part of the shell and is welded with the first adapter to form a first welding part; at least a portion of the seal is disposed between the first electrode terminal and the wall portion. The first conductive part is arranged on one side of the first welding part away from the main body part and used for covering the first welding part. The first conductive part comprises a first conductive part and a second conductive part which are connected with each other and are different in base metal, the first conductive part is welded to the first electrode terminal, and the second conductive part is at least partially located on the side, away from the main body part of the electrode assembly, of the first conductive part and used for being connected with the confluence component. According to the invention, the influence of the first conductive member on the sealing effect between the first electrode terminal and the wall part can be reduced, and the reliability and the sealing performance are improved.

Description

Technical Field

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

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric boats, electric toy cars, electric toy boats, electric toy airplanes and power tools, etc.

[0003] In the development of battery technology, how to improve the reliability and sealing performance of battery cells is a research direction in battery technology. Summary of the invention

[0004] The embodiments of the present application provide a battery cell, a battery device and an electrical equipment, which are beneficial to improving the reliability and sealing performance of the battery cell.

[0005] According to a first aspect of the present application, the present application provides a battery cell, which includes a housing, an electrode assembly, a first electrode terminal, a sealing member and a first conductive member. The housing includes a wall portion, and the wall portion is provided with an electrode lead-out hole. The electrode assembly is accommodated in the housing, and the electrode assembly includes a main body portion and a first pole lug led out from the main body portion. The first adapter is connected to the first pole lug. The first electrode terminal is fixedly arranged on the wall portion and partially accommodated in the electrode lead-out hole. The first electrode terminal is welded with the first adapter and forms a first welding portion, and the first welding portion is exposed on the side of the first electrode terminal away from the main body portion. The sealing member is along the thickness direction of the wall portion, and at least part of the sealing member is arranged between the first electrode terminal and the wall portion. The first conductive member is arranged on the side of the first welding portion away from the main body portion and is used to cover the first welding portion. The first conductive member includes a first conductive portion and a second conductive portion connected to each other, the base metals of the first conductive portion and the second conductive portion are different, and the base metals of the first conductive portion and the first electrode terminal are the same, the first conductive portion is welded to the first electrode terminal, and along the thickness direction of the wall portion, at least part of the second conductive portion is located on the side of the first conductive portion away from the main body portion and is used to connect with the current collecting component.

[0006] The first adapter and the first electrode terminal are welded from the outside, which is beneficial to reduce the possibility of welding particles generated during welding falling into the outer shell, reduce the risk of internal short circuit, and improve the reliability of the battery cell. The first conductive member can cover the first welding portion exposed from the outside of the first electrode terminal, reducing the risk of corrosion of the first welding portion. The first electrode terminal is fixed to the wall portion, and the seal between the first electrode terminal and the wall portion does not rely on the first conductive member, which is beneficial to reduce the influence of the first conductive member on the sealing interface between the first electrode terminal and the wall portion, reduce the risk of sealing failure between the first electrode terminal and the wall portion caused by the fracture of the connection interface between the first conductive portion and the second conductive portion, and improve the reliability of the battery cell.

[0007] In some embodiments, the first electrode terminal includes a terminal body, a first limiting portion and a second limiting portion, the first limiting portion is at least partially disposed on a side of the wall away from the main body, the second limiting portion is at least partially disposed on a side of the wall close to the main body, at least a portion of the terminal body is accommodated in the electrode lead-out hole and connects the first limiting portion and the second limiting portion; along the thickness direction, at least a portion of the sealing member is disposed between the wall and the second limiting portion; the terminal body is welded to the first adapter and forms a first welding portion, and the first conductive portion is welded to the terminal body. At least a portion of the first limiting portion and at least a portion of the second limiting portion are respectively disposed on both sides of the wall along the thickness direction, so that the first electrode terminal can be limited in the thickness direction, which is beneficial for fixing the first electrode terminal relative to the housing.

[0008] In some embodiments, a first recess is provided on a side of the terminal body away from the main body, the first conductive member covers the first recess, the first bottom wall of the first recess is welded to the first adapter and forms a first welding portion, and the first welding portion is exposed in the first recess. The first bottom wall of the first recess is closer to the side of the wall facing the main body, which is conducive to reducing the difficulty of welding the first electrode terminal and the first adapter and improving the welding effect; it is also conducive to reducing the thickness of the portion of the terminal body used for welding with the first adapter, reducing welding power, and reducing welding heat generation.

[0009] In some embodiments, the first conductive part and the first welding part are spaced apart in the thickness direction. The first welding part does not contact the first conductive part, which is beneficial to reduce the risk of interference between the first conductive part and the first welding part and improve the connection stability between the first conductive part and the first electrode terminal.

[0010] In some embodiments, the first welding portion is spaced apart from the side wall of the first recess, thereby reducing the difficulty of welding the first electrode terminal and the first adapter and improving assembly efficiency.

[0011] In some embodiments, the terminal body is provided with a first through hole, and the first through hole penetrates the first bottom wall of the first recess in the thickness direction; a portion of the first adapter is accommodated in the first through hole and welded with the terminal body to form a first welding portion. This is conducive to determining the welding position during the welding operation and reducing the welding difficulty. The first through hole can limit the first adapter, which is conducive to reducing the risk of relative displacement between the terminal body and the first adapter during the welding operation and improving the welding stability.

[0012] In some embodiments, a second recess is provided on one side of the terminal body close to the main body, and the terminal body includes a partition wall, and the partition wall separates the first recess from the second recess along the thickness direction; at least part of the first adapter is accommodated in the second recess, and the first adapter is welded to the partition wall to form a first welding portion. Thus, it is beneficial to reduce the thickness of the partition wall used for welding with the first adapter, reduce the welding power of the first electrode terminal and the first adapter, reduce welding heat generation, and improve welding stability.

[0013] In some embodiments, in the same plane perpendicular to the thickness direction, the orthographic projection range of the first recess exceeds the orthographic projection range of the second recess. The orthographic projection range of the first recess is larger, which is conducive to increasing the distance between the first welding portion and the side wall of the first recess, reducing the welding difficulty, and reducing the welding heat transferred to the side wall of the first recess, reducing the risk of deformation of the terminal body.

[0014] In some embodiments, the first conductive portion is at least partially contained in the first recess and welded to the sidewall of the first recess. The first conductive portion and the first electrode terminal can share part of the space in the thickness direction, which is beneficial to saving the space occupied by the battery cell in the thickness direction and improving the energy density of the battery cell.

[0015] In some embodiments, the first recess includes a first sub-recess and a second sub-recess, the first sub-recess and the second sub-recess are arranged along the direction from the main body to the wall, and in the same plane perpendicular to the thickness direction, the orthographic projection range of the second sub-recess exceeds the orthographic projection range of the first sub-recess; the first conductive part is at least partially accommodated in the second sub-recess and welded to the side wall of the second sub-recess. Part of the surface of the first recess can support the first conductive part, which is conducive to improving the support stability of the first conductive part and improving the connection stability between the first conductive part and the terminal body.

[0016] In some embodiments, the first recess includes a third sub-recess, and the first sub-recess, the second sub-recess and the third sub-recess are arranged in sequence along the direction from the main body to the wall, and in the same plane perpendicular to the thickness direction, the orthographic projection range of the third sub-recess exceeds the orthographic projection range of the second sub-recess; the first conductive part is welded with the terminal body to form a second welding part, the second welding part is connected to the side of the second sub-recess and the first outer peripheral surface of the first conductive part, and a part of the second welding part is accommodated in the third sub-recess. During welding, the third sub-recess can provide a clearance space for the molten part of the first conductive part and the terminal body, so that at least part of the molten part flows in a direction away from the first outer peripheral surface of the first conductive part, which is conducive to reducing the size of the second welding part formed after the molten part solidifies in the thickness direction, reducing the possibility of the second welding part exceeding the third sub-recess, and reducing the risk of the second welding part being worn and causing the connection between the first electrode terminal and the first conductive member to fail. The combination of the first welding part and the second welding part can play a double sealing role, which is conducive to improving the sealing performance of the battery cell.

[0017] In some embodiments, the first conductive part includes a first conductive sub-part and a second conductive sub-part, the first conductive sub-part and the second conductive part are stacked in a direction from the main body to the wall part, the second conductive sub-part surrounds the first conductive sub-part and protrudes from the second outer peripheral surface of the second conductive part, and the second conductive sub-part is welded to the side wall of the first recess; a third recess is provided on the side of the second conductive sub-part facing the second conductive part. The third recess can provide a stress release space, which is conducive to relieving and releasing the stress suffered by the first conductive part and the terminal body during welding, and reducing the risk of the first conductive part and the terminal body being broken.

[0018] In some embodiments, the thickness of the second limiting portion is greater than that of the first limiting portion. On the one hand, it is beneficial to improve the structural strength of the first electrode terminal and improve the stability of the first electrode terminal relative to the wall; on the other hand, the second limiting portion can share part of the space in the thickness direction with the first tab and / or the first adapter, reducing the additional space occupied in the thickness direction.

[0019] In some embodiments, the first adapter includes an adapter body, a first convex portion and a second convex portion. Along the first direction, the adapter body is connected between the first convex portion and the second convex portion, and the first direction is perpendicular to the thickness direction; at least part of the adapter body is arranged on the side of the second limiting portion away from the wall portion, the first convex portion and the second convex portion both protrude from the surface of the adapter body facing the second limiting portion, the first convex portion is welded with the terminal body to form a first welding portion, and the second convex portion is arranged on one side of the second limiting portion along the first direction; at least part of the first pole ear is located on the side of the second convex portion close to the main body and connected to the second convex portion. A storage space can be formed on the side of the second convex portion facing the main body for accommodating at least part of the first pole ear. The second convex portion and the first pole ear can share part of the space in the thickness direction with the second limiting portion, which is conducive to improving space utilization and increasing the energy density of the battery cell.

[0020] In some embodiments, along the thickness direction, a portion of the first pole lug is located between the second limiting portion and the first adapter, and is connected to the first adapter and the second limiting portion. A current flow path is formed between the first pole lug and the first adapter, and between the first pole lug and the second limiting portion, and part of the current can be directly transmitted between the first pole lug and the first electrode terminal, which is beneficial to improving the current flow capacity of the battery cell.

[0021] In some embodiments, the first electrode terminal includes a first surface facing away from the main body along the thickness direction, and at least a portion of the second conductive portion extends beyond the first surface along the direction of the main body toward the wall portion. This is beneficial for reducing the risk of interference between the busbar component and the first electrode terminal when connecting the busbar component and the second conductive portion, and improving the connection reliability of the busbar component and the second conductive portion.

[0022] In some embodiments, the first conductive part and the second conductive part are connected by at least one of cold rolling, hot rolling, explosive compounding, and explosive rolling, thereby improving the connection strength and stability between the first conductive part and the second conductive part and reducing the risk of separation of the connection surfaces of the first conductive part and the second conductive part.

[0023] In some embodiments, the electrode assembly includes a second pole lug extending from the main body, the second pole lug has a polarity opposite to that of the first pole lug; the battery cell also includes a second electrode terminal and a second adapter, the second electrode terminal is electrically connected to the second pole lug and the second adapter; the base metal of the second electrode terminal is the same as the base metal of the second conductive portion. The second conductive portion of one battery cell and the second electrode terminal of another battery cell can be welded to the same busbar, which is conducive to realizing the series connection between the two battery cells and reducing the difficulty of connection.

[0024] In some embodiments, a fourth recess is provided on a side of the second electrode terminal away from the main body, the second electrode terminal is provided with a second through hole, the second through hole penetrates the second bottom wall of the fourth recess in the thickness direction, at least part of the second adapter is accommodated in the second through hole and welded with the second electrode terminal to form a third welding portion, and the third welding portion is exposed in the fourth recess; the battery cell includes a second conductive member, the second conductive member is welded to the second electrode terminal, and is used to connect with the current collection component, and the second conductive member covers the fourth recess in the thickness direction. The second adapter and the second electrode terminal are welded from the outside, which is conducive to reducing the possibility of welding particles generated during welding falling into the shell, reducing the risk of internal short circuit, and improving the reliability of the battery cell. The second conductive member can cover the third welding portion exposed from the outside of the second electrode terminal, reducing the risk of corrosion of the third welding portion.

[0025] In some embodiments, the base metal of the first conductive part and the base metal of the first electrode terminal are both copper; and the base metal of the second conductive part is aluminum.

[0026] In some embodiments, the housing includes a shell and an end cover, the shell has an opening, the end cover is connected to the shell and covers the opening, and the wall portion is the end cover. This is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0027] According to the second aspect of the present application, the present application provides a battery device, which includes a battery cell and a busbar component provided according to any embodiment of the first aspect, the base metal of the busbar component is the same as the base metal of the second conductive part, and the busbar component is welded to the second conductive part.

[0028] According to a third aspect of the present application, the present application provides an electrical device, which includes a battery device provided according to any embodiment of the second aspect of the present application, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0030] Figure 1 It is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.

[0031] Figure 2 It is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0032] Figure 3 It is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0033] Figure 4 yes Figure 3 A schematic top view of a battery cell is shown.

[0034] Figure 5 is along Figure 4 A cross-sectional view taken along direction AA.

[0035] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of area B in the middle.

[0036] Figure 7 It is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0037] Figure 8 yes Figure 6 Schematic diagram of the decomposition structure.

[0038] Fig. 9 yes Figure 6 Schematic diagram of the enlarged structure of area C in the middle.

[0039] Fig.10 is a cross-sectional view of a first electrode terminal of a battery cell provided in some embodiments of the present application.

[0040] Fig.11 4 is a cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0041] Fig.12 is along Figure 4 A cross-sectional view of a portion of the structure taken along direction DD.

[0042] Fig.13 is a cross-sectional view of a battery device provided in some embodiments of the present application.

[0043] In the attached figure: Vehicle 1, battery device 2, controller 3, motor 4, busbar component 7; Box body 5, first box body part 5a, second box body part 5b, accommodating space 5c; Battery cell 6, electrode assembly 10, main body 11, first pole ear 12, second pole ear 13, shell 20, shell 21, opening 211, end cover 22, wall 23, electrode lead hole 231, second surface 23a, first electrode terminal 30, first surface 30a, terminal body 31, first recess 311, first sub-recess 3111, first inner circumferential surface 3111a, second sub-recess 3112, second inner circumferential surface 3112a, third sub-recess 3113, third inner circumferential surface 3113a, first step surface 311a, second step surface 311b, first bottom wall 312, first through hole 313, second recess 311 14, partition wall 315, first limiting portion 32, second limiting portion 33, first adapter 40, adapter body 41, first convex portion 42, second convex portion 43, first conductive member 60, first conductive portion 61, first conductive sub-portion 611, second conductive sub-portion 612, third recess 613, first outer peripheral surface 61a, second conductive portion 62, second outer peripheral surface 62a, connecting surface 63, second electrode terminal 70, fourth recess 71, second through hole 72, second bottom wall 73, second adapter 80, second conductive member 90, first welding portion W1, second welding portion W2, third welding portion W3, thickness direction X, first direction Y. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0045] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as those commonly understood by technicians in the technical field of this application; the terms used in the specification of this application are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned drawings and any variations thereof are intended to cover non-exclusive inclusions. The terms "first", "second", etc. in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary and secondary relationship.

[0046] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. The appearance of the phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments.

[0047] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", and "attached" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be the internal communication of two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0048] The term "and / or" in this application is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this application generally indicates that the associated objects before and after are in an "or" relationship.

[0049] In the embodiments of the present application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width and other dimensions of various components in the embodiments of the present application shown in the drawings, as well as the overall thickness, length, width and other dimensions of the integrated device are only exemplary descriptions and should not constitute any limitation to the present application.

[0050] The term “plurality” used in this application refers to two or more (including two).

[0051] In the embodiments of the present application, "parallel" includes not only the absolutely parallel situation, but also the roughly parallel situation conventionally recognized in engineering; at the same time, "vertical" includes not only the absolutely vertical situation, but also the roughly vertical situation conventionally recognized in engineering.

[0052] In the embodiment of the present application, the battery cell may be a secondary battery cell, which refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0053] The battery cells can be lithium-ion battery cells, sodium-ion battery cells, sodium-lithium-ion battery cells, lithium metal battery cells, sodium metal battery cells, lithium-sulfur battery cells, magnesium-ion battery cells, nickel-hydrogen battery cells, nickel-cadmium battery cells, lead-acid battery cells, etc., which are not limited in the embodiments of the present application.

[0054] A battery cell generally includes an electrode assembly, a housing, and an electrode terminal. The electrode assembly is contained in the housing, and the electrode terminal is disposed in the housing. The housing is used to encapsulate the electrode assembly and components such as the electrolyte. The electrode assembly includes a tab, which is electrically connected to the electrode terminal through an adapter or directly electrically connected to the electrode terminal. The electrode terminal can be used to electrically connect the electrode assembly to a circuit outside the battery cell to realize charging or discharging of the battery cell.

[0055] The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and released back and forth between the positive electrode and the negative electrode. The separator is set between the positive electrode and the negative electrode to prevent the positive and negative electrodes from short-circuiting, while allowing active ions to pass through.

[0056] In some embodiments, the positive electrode may be a positive electrode sheet, and the positive electrode sheet may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0057] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0058] In some embodiments, a separator is disposed between the positive electrode and the negative electrode.

[0059] In some embodiments, the separator is a separator. The present application has no particular limitation on the type of separator, and any known separator with a porous structure having good chemical stability and mechanical stability can be selected.

[0060] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transmit ions and isolate the positive and negative electrodes.

[0061] In some embodiments, the electrode assembly is a wound structure, wherein the positive electrode sheet and the negative electrode sheet are wound into a wound structure.

[0062] In some embodiments, the electrode assembly is a laminate structure.

[0063] The battery device mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include a plurality of battery cells, and the plurality of battery cells are connected in series, in parallel or in mixed connection through a busbar.

[0064] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0065] A battery device generally includes a box for encapsulating one or more battery cells, which can prevent liquid or other foreign matter from affecting the charging or discharging of the battery cells.

[0066] As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells by cable ties. The battery cell assembly may be accommodated in the box by fixing the battery module in the box. As an example, the box may include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0067] In some embodiments, the box body can be used as a part of the chassis structure of the vehicle. For example, part of the box body can become at least a part of the floor of the vehicle, or part of the box body can become at least a part of the cross beam and longitudinal beam of the vehicle.

[0068] In some embodiments, the battery device may be an energy storage device, which includes an energy storage container, an energy storage cabinet, and the like.

[0069] The electrode terminal usually electrically connects the electrode assembly to the circuit outside the battery cell through the busbar. When the busbar and the electrode assembly are made of different materials, the electrode terminal needs to be made of a composite material based on the limitation of the connection process. In the related art, the electrode terminal includes a first part and a second part of different materials, and the first part and the second part can be combined together by friction welding or other connection methods. The first part is at least partially arranged inside the shell and connected to the lug through an adapter; the second part is at least partially arranged outside the shell and used to connect the busbar. Through the connection between the first part and the second part, the first part can form a seal with the shell of the battery cell. However, the composite interface of the first part and the second part is subject to the tensile force of the busbar and the adapter, and there is a risk of breaking. After the first part and the second part are broken, the first part lacks support, and the sealing interface between the first part and the shell is prone to failure, and there are risks of leakage, short circuit, fire, etc., which affect the reliability of the battery cell.

[0070] In view of this, the present application provides a technical solution, which is to fix the first electrode terminal to the wall of the housing, weld the first electrode terminal and the first adapter to form a first welding part, and set the first conductive part used to cover the first welding part to a composite structure including a first conductive part and a second conductive part with different base metals, and the first conductive part and the second conductive part can be welded to the first electrode terminal and the busbar component respectively to achieve electrical connection between the battery cell and the external circuit. The seal between the first electrode terminal and the wall does not rely on the first conductive part, which is conducive to reducing the influence of the first conductive part on the sealing interface between the first electrode terminal and the wall, reducing the risk of sealing failure between the first electrode terminal and the wall due to the fracture of the composite interface between the first conductive part and the second conductive part, and improving the reliability of the battery cell.

[0071] The technical solution provided in the embodiments of the present application is applicable to battery cells, battery devices, and electrical equipment using the battery devices.

[0072] The battery device disclosed in the embodiments of the present application can be used in various energy storage systems that use the battery device as a power source or use the battery device as an energy storage element. The electrical device can be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, and the like. Among them, the electric toy can include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, and an electric airplane toy, and the like, and the spacecraft can include an airplane, a rocket, a space shuttle, and a spacecraft, and the like.

[0073] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0074] Figure 1 is a schematic diagram of the structure of a vehicle provided by some embodiments of the present application. Figure 1 The vehicle 1 may be a fuel vehicle, a gas vehicle or a new energy vehicle, and the new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 2 is provided inside the vehicle 1, and the battery device 2 may be provided at the bottom, head or tail of the vehicle 1. The battery device 2 may be used to power the vehicle 1, for example, the battery device 2 may be used as an operating power source for the vehicle 1. The vehicle 1 may also include a controller 3 and a motor 4, and the controller 3 is used to control the battery device 2 to power the motor 4, for example, for starting, navigating and driving the vehicle 1.

[0075] In some embodiments of the present application, the battery device 2 can not only serve as an operating power source for the vehicle 1 , but also serve as a driving power source for the vehicle 1 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1 .

[0076] Figure 2 is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application. Figure 2The battery device 2 includes a box body 5 and a battery cell 6, and the battery cell 6 is accommodated in the box body 5. The box body 5 is used to provide a storage space for the battery cell 6, and the box body 5 can adopt a variety of structures. In some embodiments, the box body 5 may include a first box body part 5a and a second box body part 5b, the first box body part 5a and the second box body part 5b cover each other, and the first box body part 5a and the second box body part 5b jointly define a storage space 5c for accommodating the battery cell 6. The second box body part 5b may be a hollow structure with one end open, the first box body part 5a may be a plate-shaped structure, the first box body part 5a covers the open side of the second box body part 5b, so that the first box body part 5a and the second box body part 5b jointly define the storage space 5c; the first box body part 5a and the second box body part 5b may also be hollow structures with one side open, and the open side of the first box body part 5a covers the open side of the second box body part 5b. Of course, the box body 5 formed by the first box body part 5a and the second box body part 5b can be in various shapes, such as a cylinder, a cuboid, etc.

[0077] In order to improve the sealing performance after the first box body part 5a and the second box body part 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0078] Assuming that the first box body portion 5a covers the top of the second box body portion 5b, the first box body portion 5a can also be called an upper box cover, and the second box body portion 5b can also be called a lower box.

[0079] In the battery device 2, there can be multiple battery cells 6, and the multiple battery cells 6 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 6 are both connected in series and in parallel. The multiple battery cells 6 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 6 is accommodated in the box 5; of course, the battery device 2 can also be a battery module formed by connecting multiple battery cells 6 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the box 5. The battery device 2 can also include other structures, for example, the battery device 2 can also include a busbar component for realizing electrical connection between the multiple battery cells 6.

[0080] For example, the battery cell 6 may be the smallest unit constituting the battery device 2 .

[0081] Figure 3 Schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application. Figure 3 The battery cell 6 includes an electrode assembly 10 and a shell 20 , and the electrode assembly 10 is disposed in the shell 20 .

[0082] The housing 20 is used to encapsulate the electrode assembly 10 and the electrolyte and other components. The housing 20 can be a steel housing, an aluminum housing, a plastic housing (such as polypropylene), a composite metal housing (such as a copper-aluminum composite housing) or an aluminum-plastic film.

[0083] In some embodiments, the housing 20 is a hollow structure, and a space for accommodating the electrode assembly 10 and the electrolyte is formed therein. The shape of the housing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a rectangular parallelepiped structure, a rectangular housing can be selected.

[0084] The material of the housing 20 can be various, for example, the material of the housing 20 can be metal or plastic. Optionally, the material of the housing 20 can be copper, iron, aluminum, steel, aluminum alloy, etc. Exemplarily, the housing 20 can be a steel shell, an aluminum shell, a plastic shell (such as polypropylene), a composite metal shell (such as a copper-aluminum composite shell) or an aluminum-plastic film, etc.

[0085] As an example, the housing 20 includes a shell 21 and an end cover 22 . The shell 21 has an opening 211 , and the end cover 22 is used to cover the opening 211 .

[0086] The housing 21 is a component used to cooperate with the end cover 22 to form an internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, electrolyte and other components.

[0087] The housing 21 and the end cap 22 may be independent components. For example, an opening 211 may be provided on the housing 21 , and the end cap 22 may cover the opening 211 at the opening 211 to form an internal cavity of the battery cell 6 .

[0088] The shape of the end cap 22 can be adapted to the shape of the housing 21 to match the housing 21. The material of the end cap 22 can be the same as or different from that of the housing 21.

[0089] The end cover 22 can be connected to the housing 21 by welding, bonding, clamping or other methods.

[0090] The shell 21 may have an opening 211 at one end or at both ends. Exemplarily, the shell 21 has an opening 211 at one end, and one end cap 22 is provided to cover the opening 211 of the shell 21. As another example, the shell 21 may also have an opening 211 at both ends, and two end caps 22 are provided, and the two end caps 22 cover the two openings 211 of the shell 21, respectively.

[0091] Figure 4 yes Figure 3 A schematic top view of a battery cell is shown, Figure 5 is along Figure 4 A cross-sectional view taken along the AA direction, Figure 6 yes Figure 5Schematic diagram of the enlarged structure of area B in the middle. Figure 7 is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application, Figure 8 yes Figure 6 Schematic diagram of the decomposition structure, Fig. 9 yes Figure 6 Schematic diagram of the enlarged structure of area C in the middle. Fig.10 is a cross-sectional view of a first electrode terminal of a battery cell provided in some embodiments of the present application, Fig.11 is a cross-sectional view of a battery cell provided in some other embodiments of the present application, Fig.12 is along Figure 4 A cross-sectional view of a portion of the structure taken along direction DD.

[0092] Reference Figures 3 to 12 In some embodiments, the battery cell 6 includes an electrode assembly 10, a housing 20, a first electrode terminal 30, a first adapter 40, a sealing member 50 and a first conductive member 60. The housing 20 includes a wall portion 23, and the wall portion 23 is provided with an electrode lead-out hole 231. The electrode assembly 10 is accommodated in the housing 20, and the electrode assembly 10 includes a main body 11 and a first pole tab 12 led out from the main body 11. The first adapter 40 is connected to the first pole tab 12. The first electrode terminal 30 is fixedly arranged on the wall portion 23 and partially accommodated in the electrode lead-out hole 231. The first electrode terminal 30 is welded to the first adapter 40 to form a first welding portion W1, and the first welding portion W1 is exposed on a side of the first electrode terminal 30 away from the main body 11. Along the thickness direction X of the wall portion 23, at least a portion of the sealing member 50 is arranged between the first electrode terminal 30 and the wall portion 23. The first conductive member 60 is arranged on a side of the first welding portion W1 away from the main body 11 and is used to cover the first welding portion W1. The first conductive member 60 includes a first conductive portion 61 and a second conductive portion 62 connected to each other, the base metals of the first conductive portion 61 and the second conductive portion 62 are different, the base metals of the first conductive portion 61 and the first electrode terminal 30 are the same, and the first conductive portion 61 is welded to the first electrode terminal 30. Along the thickness direction X of the wall portion 23, at least a portion of the second conductive portion 62 is located on a side of the first conductive portion 61 away from the main body portion 11 and is used to connect to the busbar component.

[0093] The wall portion 23 may be the end cover 22, or may be one of the shell walls of the shell 21. Figure 3 and Figure 4 In the illustrated embodiment, the wall portion 23 is an end cap 22 .

[0094] The main body 11 is the core part of the electrode assembly 10 to realize the charging and discharging functions. The first electrode tab 12 can be led out from one end of the main body 11 close to the wall 23, or from other ends of the main body 11. Figure 3In the illustrated embodiment, the first electrode tab 12 is led out from one end of the main body 11 close to the wall 23 , which is helpful to simplify the structure of the first adapter 40 .

[0095] The first adapter 40 can be connected to the first electrode tab 12 by welding, bonding or other suitable methods.

[0096] The first electrode terminal 30 is disposed on the wall portion 23 and fixed relative to the wall portion 23. Optionally, the first electrode terminal 30 may be fixed on the wall portion 23 by riveting, or may be fixed on the wall portion 23 by a fixing member.

[0097] The seal 50 is used to seal the first electrode terminal 30 and the wall portion 23 . A portion of the first electrode terminal 30 is disposed on one side of the wall portion 23 along the thickness direction X, and at least a portion of the seal 50 may be sandwiched between the first electrode terminal 30 and the wall portion 23 .

[0098] At least a portion of the sealing member 50 may be disposed around the electrode lead-out hole 231 to achieve sealing of the first electrode terminal 30 and the wall portion 23 in the entire circumference of the electrode lead-out hole 231 .

[0099] The first electrode terminal 30 and the first adapter 40 may be welded by penetration welding or butt welding. Alternatively, the first electrode terminal 30 and the first adapter 40 may be heated by irradiating a laser so that a portion of the first electrode terminal 30 and a portion of the first adapter 40 are melted and fused together, and the fused portions are solidified to form a first welding portion W1.

[0100] The number of the first welding part W1 may be one or more.

[0101] The first welding portion W1 may be in a ring shape, an arc shape, a strip shape or other suitable shapes.

[0102] The first welding portion W1 is exposed on the side of the first electrode terminal 30 away from the main body 11, which means that the first welding portion W1 can be exposed from the side of the first electrode terminal 30 away from the main body 11. The side of the first electrode terminal 30 away from the main body 11 is the outer side of the first electrode terminal 30 facing away from the inside of the housing 20. The first welding portion W1 is exposed from the outer side of the first electrode terminal 30.

[0103] When performing the welding operation, the first electrode terminal 30 and the first adapter 40 can be heated from the outside of the first electrode terminal 30, so that the first welding portion W1 is exposed on the outside of the first electrode terminal 30, which is beneficial to reduce the possibility of welding particles generated during the welding process falling into the side of the first adapter 40 facing the main body 11, reduce the risk of internal short circuit in the battery cell 6, and improve the reliability of the battery cell 6.

[0104] In the same plane perpendicular to the thickness direction X, the orthographic projection of the first welding portion W1 may be located within the orthographic projection of the first conductive member 60. The first conductive member 60 may cover the first welding portion W1 from the outside to reduce the risk of corrosion of the first welding portion W1.

[0105] The first conductive portion 61 and the second conductive portion 62 may be connected by welding, rolling or other suitable methods.

[0106] In the embodiment of the present application, "base metal" refers to the main metal component. The main metal component of the first conductive part 61 is different from the main metal component of the second conductive part 62, and the main metal component of the first conductive part 61 is the same as the main metal component of the first electrode terminal 30, so as to facilitate welding of the first conductive part 61 and the first electrode terminal 30.

[0107] Optionally, the first electrode tab 12 is a negative electrode tab. The first conductive portion 61 and the first electrode terminal 30 may be made of aluminum or an aluminum alloy, and the base metal of the first conductive portion 61 and the first electrode terminal 30 is aluminum. The second conductive portion 62 may be made of copper or a copper alloy, and the base metal of the second conductive portion 62 is copper.

[0108] Optionally, the base metal of the first adapter 40 is the same as the base metal of the first electrode terminal 30 to facilitate welding of the two.

[0109] The second conductive portion 62 is used to connect to the current collecting component. The second conductive portion 62 can be connected to the current collecting component by welding, bonding or other appropriate methods.

[0110] Optionally, the base metal of the second conductive part 62 may be the same as the base metal of the busbar component, so that the two can be connected by welding, which is beneficial to improving the connection strength and connection stability.

[0111] The second conductive part 62 may be located entirely on the side of the first conductive part 61 away from the main body 11 , or only a portion of the second conductive part 62 may be located on the side of the first conductive part 61 away from the main body 11 . The other portion of the second conductive part 62 may, for example, cover a portion of the outer periphery of the first conductive part 61 .

[0112] During assembly, the first pole ear 12 can be first connected to the first adapter 40 and the first pole ear 12 can be bent; then the electrode assembly 10 and the first adapter 40 are installed as a whole in the shell 21, and the wall portion 23 is assembled to the shell 21; then the first adapter 40 and the first electrode terminal 30 are welded from the side of the first electrode terminal 30 away from the main body 11; finally, the first conductive member 60 is assembled to the first electrode terminal 30, and the first conductive portion 61 and the first electrode terminal 30 are welded.

[0113] The first adapter 40 and the first electrode terminal 30 are welded from the outside, which is beneficial to reduce the possibility of welding particles generated during welding falling into the outer shell 20, reduce the risk of internal short circuit, and improve the reliability of the battery cell 6. The first conductive member 60 can cover the first welding portion W1 exposed from the outside of the first electrode terminal 30, reducing the risk of corrosion of the first welding portion W1.

[0114] In the embodiment of the present application, the first conductive member 60 is set as a composite structure including a first conductive part 61 and a second conductive part 62 with different base metals, and the electrical connection between the battery cell 6 and the external circuit can be achieved by welding the first conductive part 61 and the first electrode terminal 30, and connecting the second conductive part 62 and the current collecting component. The first electrode terminal 30 is fixedly arranged on the wall portion 23, and the sealing between the first electrode terminal 30 and the wall portion 23 does not rely on the first conductive member 60, which is conducive to reducing the influence of the first conductive member 60 on the sealing interface between the first electrode terminal 30 and the wall portion 23, reducing the risk of sealing failure between the first electrode terminal 30 and the wall portion 23 caused by the fracture of the connection interface between the first conductive part 61 and the second conductive part 62, and improving the reliability of the battery cell 6.

[0115] In some embodiments, the battery cell 6 further includes an insulating support member, which is disposed on the main body 11 and between the main body 11 and the first adapter 40. The insulating support member can be used to support the first adapter 40, which is beneficial to improve the welding effect between the first adapter 40 and the first electrode terminal 30.

[0116] Optionally, the insulating support member may be an insulating film, an insulating bracket or other components that can perform insulating and supporting functions.

[0117] In some embodiments, reference Figure 6 , Figure 8 and Fig. 9 The first electrode terminal 30 includes a terminal body 31, a first limiting portion 32, and a second limiting portion 33. The first limiting portion 32 is at least partially disposed on a side of the wall portion 23 away from the main body 11, and the second limiting portion 33 is at least partially disposed on a side of the wall portion 23 close to the main body 11. At least a portion of the terminal body 31 is accommodated in the electrode lead-out hole 231 and connects the first limiting portion 32 and the second limiting portion 33. Along the thickness direction X, at least a portion of the sealing member 50 is disposed between the wall portion 23 and the second limiting portion 33. The terminal body 31 is welded to the first adapter 40 to form a first welding portion W1, and the first conductive portion 61 is welded to the terminal body 31.

[0118] The terminal body 31 is inserted into the electrode lead-out hole 231, and a portion of the terminal body 31 may extend out of the electrode lead-out hole 231 along the thickness direction X. The first stopper 32 may be connected to one end of the terminal body 31 away from the main body 11 along the thickness direction X, and the second stopper 33 may be connected to the other end of the terminal body 31 close to the main body 11 along the thickness direction X.

[0119] Optionally, the terminal body 31, the first limiting portion 32 and the second limiting portion 33 are an integrally formed structure. At least one of the first limiting portion 32 and the second limiting portion 33 can be formed by riveting.

[0120] The terminal body 31 may be a cylindrical structure or a columnar structure. The terminal body 31 has an outer peripheral surface surrounding its central axis, and the first limiting portion 32 and the second limiting portion 33 may be connected and protrude from the outer peripheral surface of the terminal body 31 .

[0121] Optionally, the dimension of the second limiting portion 33 protruding from the outer circumferential surface of the terminal body 31 is larger than the dimension of the first limiting portion 32 protruding from the outer circumferential surface of the terminal body 31, which is beneficial to increase the size of the seal 50, thereby increasing the contact area between the second limiting portion 33 and the seal 50 and improving the sealing effect.

[0122] Optionally, a first recess 311 is provided on a side of the terminal body 31 away from the main body 11, and the first adapter 40 is welded to the first bottom wall 312 of the first recess 311 to form a first welding portion W1, which is exposed on a side of the first electrode terminal 30 away from the main body 11 through the first recess 311.

[0123] Alternatively, the terminal body 31 is provided with a through hole, which passes through the terminal body 31 along the thickness direction X, and at least a portion of the first adapter 40 is accommodated in the through hole and welded to the hole wall of the through hole, thereby forming a first welding portion W1. The first welding portion W1 is exposed on the side of the first electrode terminal 30 away from the main body 11 through the through hole.

[0124] At least part of the first limiting portion 32 and at least part of the second limiting portion 33 are respectively arranged on both sides of the wall portion 23 along the thickness direction X, so as to limit the first electrode terminal 30 in the thickness direction X, which is beneficial for fixing the first electrode terminal 30 relative to the housing 20.

[0125] In some embodiments, reference Figures 6 to 8 A first recess 311 is provided on one side of the terminal body 31 away from the main body 11 , the first conductive member 60 covers the first recess 311 , the first bottom wall 312 of the first recess 311 is welded to the first adapter 40 and forms a first welding portion W1 , and the first welding portion W1 is exposed in the first recess 311 .

[0126] The first recess 311 is open at a side of the terminal body 31 away from the main body 11 . The first conductive member 60 covers the first recess 311 , which means that the first conductive member 60 covers the opening of the first recess 311 away from the main body 11 .

[0127] In some examples, the first conductive member 60 is entirely contained in the first recess 311. In other examples, the first conductive member 60 is entirely disposed outside the first recess 311. In still other examples, a portion of the first conductive member 60 is contained in the first recess 311, and another portion is disposed outside the first recess 311.

[0128] When the terminal body 31 and the first adapter 40 are welded from the outside of the first electrode terminal 30, a portion of the first welding portion W1 may protrude from the bottom surface of the first recess 311. The first recess 311 can provide a receiving space for the portion of the first welding portion W1 protruding from the bottom surface, which is beneficial to reduce the risk of interference between the first welding portion W1 and the first conductive portion 61.

[0129] In the embodiment of the present application, the first recess 311 is provided, and the first bottom wall 312 of the first recess 311 is closer to the side of the wall portion 23 facing the main body portion 11, which is beneficial to reducing the difficulty of welding the first electrode terminal 30 and the first adapter 40 and improving the welding effect; it is also beneficial to thinning the thickness of the portion of the terminal body 31 used for welding with the first adapter 40, reducing the welding power and reducing the welding heat generation.

[0130] In some embodiments, reference Figure 6 and Figure 7 , along the thickness direction X, the first conductive portion 61 and the first welding portion W1 are arranged at intervals.

[0131] A portion of the first welding portion W1 protrudes from the bottom surface of the first recess 311 and is received in the first recess 311 .

[0132] The first conductive part 61 and the first welding part W1 are spaced apart, and the first welding part W1 does not contact the first conductive part 61 , which helps to reduce the risk of interference between the first conductive part 61 and the first welding part W1 and improve the connection stability between the first conductive part 61 and the first electrode terminal 30 .

[0133] In some embodiments, reference Figure 6 and Figure 7 The first welding portion W1 is spaced apart from the side wall of the first recess 311 .

[0134] The portion of the terminal body 31 disposed around the first recess 311 forms a side wall of the first recess 311 .

[0135] The first welding portion W1 is not connected to the side wall of the first recess 311 , which helps to reduce the difficulty of welding the first electrode terminal 30 and the first adapter 40 and improve assembly efficiency.

[0136] In some embodiments, reference Figure 6 The terminal body 31 is provided with a first through hole 313, which penetrates the first bottom wall 312 of the first recess 311 along the thickness direction X. A portion of the first adapter 40 is received in the first through hole 313 and is welded to the terminal body 31 to form a first welding portion W1.

[0137] In the same plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 313 is located within the orthographic projection of the first bottom wall 312. The orthographic projection area of ​​the first through hole 313 is smaller than the orthographic projection area of ​​the first bottom wall 312. The hole wall of the first through hole 313 is spaced apart from the side wall of the first recess 311.

[0138] The terminal body 31 and the first adapter 40 are welded by butt welding. The first welding portion W1 is connected to the hole wall of the first through hole 313 and the outer peripheral surface of the portion of the first adapter 40 accommodated in the first through hole 313. Optionally, the first welding portion W1 is connected to the bottom surface of the first recess 311. Optionally, the first welding portion W1 is connected to the surface of the portion of the first adapter 40 accommodated in the first through hole 313 close to the first recess 311.

[0139] Optionally, the first welding portion W1 is annular, which is beneficial to improving the uniformity of the current sealing distribution between the first electrode terminal 30 and the first adapter 40 .

[0140] In the embodiment of the present application, the first through hole 313 is opened in the first bottom wall 312, and the portion of the first adapter 40 accommodated in the first through hole 313 is welded to the terminal body 31, which is conducive to determining the welding position during the welding operation and reducing the welding difficulty. The first through hole 313 can limit the first adapter 40, which is conducive to reducing the risk of relative displacement between the terminal body 31 and the first adapter 40 during the welding operation and improving the welding stability.

[0141] In some embodiments, reference Figure 7 The terminal body 31 has a second recess 314 on one side close to the main body 11, and the terminal body 31 includes a partition wall 315, and the partition wall 315 separates the first recess 311 and the second recess 314 along the thickness direction X. At least part of the first adapter 40 is accommodated in the second recess 314, and the first adapter 40 is welded to the partition wall 315 to form a first welding portion W1.

[0142] The orthographic projection of the first recess 311 and the orthographic projection of the second recess 314 partially overlap in the same plane perpendicular to the thickness direction X. The overlapping portion of the orthographic projection of the first recess 311 and the orthographic projection of the second recess 314 corresponds to the partition wall 315 .

[0143] In some examples, in the same plane perpendicular to the thickness direction X, the orthographic projection area of ​​the first recess 311 is greater than the orthographic projection area of ​​the second recess 314 , and the partition wall 315 forms the bottom wall of the second recess 314 and forms a portion of the first bottom wall 312 of the first recess 311 .

[0144] In other examples, in the same plane perpendicular to the thickness direction X, the orthographic projection area of ​​the first recess 311 is smaller than the orthographic projection area of ​​the second recess 314 , and the partition wall 315 forms the first bottom wall 312 of the first recess 311 and forms a part of the bottom wall of the second recess 314 .

[0145] In some other examples, in the same plane perpendicular to the thickness direction X, the orthographic projection area of ​​the first recess 311 is equal to the orthographic projection area of ​​the second recess 314, and the orthographic projection of the first recess 311 and the orthographic projection of the second recess 314 just completely overlap. The partition wall 315 forms the first bottom wall 312 of the first recess 311 and forms the bottom wall of the second recess 314.

[0146] At least a portion of the first adapter 40 received in the first recess 311 is stacked and welded with the partition wall 315. The first adapter 40 and the partition wall 315 are welded by penetration welding.

[0147] The embodiment of the present application provides the second recess 314, which is beneficial to reducing the thickness of the partition wall 315 used for welding with the first adapter 40, reducing the welding power of the first electrode terminal 30 and the first adapter 40, reducing welding heat generation, and improving welding stability.

[0148] In some embodiments, reference Figure 7 , in the same plane perpendicular to the thickness direction X, the orthographic projection range of the first recess 311 exceeds the orthographic projection range of the second recess 314 .

[0149] In the same plane perpendicular to the thickness direction X, the orthographic projection range of the first bottom wall 312 of the first recessed portion 311 exceeds the orthographic projection range of the partition wall 315 .

[0150] Optionally, in the same plane perpendicular to the thickness direction X, the orthographic projection of the first bottom wall 312 and the orthographic projection of the partition wall 315 are both circular, and the radius of the orthographic projection of the first bottom wall 312 is greater than the radius of the orthographic projection of the partition wall 315 .

[0151] The implementation of the present application sets a larger positive projection range of the first recess 311, which is beneficial to increase the distance between the first welding portion W1 and the side wall of the first recess 311, reduce the welding difficulty, and reduce the welding heat transferred to the side wall of the first recess 311, thereby reducing the risk of deformation of the terminal body 31.

[0152] In some embodiments, reference Figure 6 , Figure 7 and Fig. 9 The first conductive portion 61 is at least partially accommodated in the first recess 311 and welded to the side wall of the first recess 311 .

[0153] The first conductive portion 61 may be entirely accommodated in the first recess 311 , or only a portion of the first conductive portion 61 may be accommodated in the first recess 311 , and the other portion of the first conductive portion 61 may be located on a side of the first recess 311 away from the main body 11 .

[0154] The first conductive portion 61 and the side wall of the first recess 311 may be welded by butt welding.

[0155] The first conductive portion 61 is at least partially accommodated in the first recess 311 , and the first conductive portion 61 and the first electrode terminal 30 can share part of the space in the thickness direction X, which is beneficial to saving the space occupied by the battery cell 6 in the thickness direction X and improving the energy density of the battery cell 6 .

[0156] In some embodiments, reference Figure 8 and Fig.10 The first recess 311 includes a first sub-recess 3111 and a second sub-recess 3112, which are arranged along the direction from the main body 11 to the wall 23, and in the same plane perpendicular to the thickness direction X, the orthographic projection range of the second sub-recess 3112 exceeds the orthographic projection range of the first sub-recess 3111. The first conductive portion 61 is at least partially accommodated in the second sub-recess 3112 and welded to the side wall of the second sub-recess 3112.

[0157] Along the thickness direction X, the first sub-recess 3111 is closer to the main body 11 than the second sub-recess 3112. In the same plane perpendicular to the thickness direction X, the orthographic projection area of ​​the second sub-recess 3112 is larger than the orthographic projection area of ​​the first sub-recess 3111.

[0158] The first conductive portion 61 is located on one side of the first sub-recess 3111 close to the second sub-recess 3112 and is at least partially accommodated in the second sub-recess 3112. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first sub-recess 3111 is located within the orthographic projection of the first conductive portion 61.

[0159] The first sub-recess 3111 includes a first inner circumferential surface 3111a surrounding the inner space of the first sub-recess 3111. The second sub-recess 3112 includes a second inner circumferential surface 3112a surrounding the inner space of the second sub-recess 3112.

[0160] Optionally, the first recess 311 includes a first stepped surface 311a, and the first stepped surface 311a connects the first inner circumferential surface 3111a and the second inner circumferential surface 3112a. A portion of the first conductive portion 61 may be supported on the first stepped surface 311a.

[0161] Alternatively, the first inner circumferential surface 3111 a intersects with the second inner circumferential surface 3112 a , the second inner circumferential surface 3112 a is inclined with respect to the thickness direction X, and a portion of the first conductive portion 61 may be supported by the second inner circumferential surface 3112 a .

[0162] In the embodiment of the present application, by providing the first sub-recess 3111 and the second sub-recess 3112 of different sizes, a portion of the surface of the first recess 311 can support the first conductive part 61 , which is beneficial to improving the supporting stability of the first conductive part 61 and improving the connection stability between the first conductive part 61 and the terminal body 31 .

[0163] In some embodiments, reference Figure 8 and Fig.10 The first recess 311 includes a third sub-recess 3113, and the first sub-recess 3111, the second sub-recess 3112 and the third sub-recess 3113 are arranged in sequence along the direction from the main body 11 to the wall 23. In the same plane perpendicular to the thickness direction X, the orthographic projection range of the third sub-recess 3113 exceeds the orthographic projection range of the second sub-recess 3112. The first conductive portion 61 is welded to the terminal body 31 to form a second welding portion W2, and the second welding portion W2 is connected to the side surface of the second sub-recess 3112 and the first outer peripheral surface 61a of the first conductive portion 61, and a part of the second welding portion W2 is accommodated in the third sub-recess 3113.

[0164] The third sub-recess 3113 includes a third inner circumferential surface 3113a, which surrounds the inner space of the third sub-recess 3113. The first recess 311 includes a second step surface 311b, which connects the third inner circumferential surface 3113a and the second inner circumferential surface 3112a. The second welding portion W2 can also be connected to the second step surface 311b.

[0165] Optionally, the first conductive portion 61 and the terminal body 31 may be welded by butt welding.

[0166] Optionally, the second welding portion W2 is annular, which is beneficial to improving the uniformity of current sealing distribution between the first electrode terminal 30 and the first conductive member 60 , and is also beneficial to improving the sealing performance between the terminal body 31 and the first conductive portion 61 .

[0167] Optionally, along the direction of the main body 11 pointing to the wall portion 23, the second welding portion W2 does not exceed the third sub-recess 3113, which is beneficial to reduce the possibility of the second welding portion W2 being worn and reduce the risk of connection failure between the first electrode terminal 30 and the first conductive member 60.

[0168] During welding, the third sub-recess 3113 can provide a clearance space for the molten part of the first conductive part 61 and the terminal body 31, so that at least part of the molten part flows in the direction away from the first outer peripheral surface 61a of the first conductive part 61, which is conducive to reducing the size of the second welding part W2 formed after the molten part solidifies along the thickness direction X, reducing the possibility of the second welding part W2 exceeding the third sub-recess 3113, and reducing the risk of the second welding part W2 being worn and causing the connection between the first electrode terminal 30 and the first conductive member 60 to fail. The combination of the first welding part W1 and the second welding part W2 can play a double sealing role, which is conducive to improving the sealing performance of the battery cell 6.

[0169] In some embodiments, reference Figures 6 to 9 The first conductive part 61 includes a first conductive sub-part 611 and a second conductive sub-part 612. The first conductive sub-part 611 and the second conductive part 62 are stacked in a direction from the main body 11 to the wall 23. The second conductive sub-part 612 surrounds the first conductive sub-part 611 and protrudes from the second outer peripheral surface 62a of the second conductive part 62. The second conductive sub-part 612 is welded to the side wall of the first recess 311. A third recess 613 is provided on the side of the second conductive sub-part 612 facing the second conductive part 62.

[0170] Optionally, the third recess 613 is an annular groove surrounding the first conductive portion 611 .

[0171] Optionally, the third recess 613 may be formed by partially thinning the second conductive portion 612 by stamping, cutting or other suitable methods.

[0172] The third recess 613 can provide a stress release space, which is helpful to relieve and release the stress on the first conductive part 61 and the terminal body 31 during welding, and reduce the risk of the first conductive part 61 and the terminal body 31 being broken.

[0173] In some embodiments, the thickness of the second limiting portion 33 is greater than the thickness of the first limiting portion 32 .

[0174] The first limiting portion 32 has a relatively small thickness, which is beneficial to reducing the size of the first limiting portion 32 in the thickness direction X, reducing the space occupied by the battery cell 6 in the thickness direction X, and improving its energy density.

[0175] The thickness of the second limiting portion 33 is relatively large. On the one hand, it is beneficial to improve the structural strength of the first electrode terminal 30 and enhance the stability of the first electrode terminal 30 relative to the wall portion 23. On the other hand, the second limiting portion 33 can share part of the space in the thickness direction X with the first tab 12 and / or the first adapter 40, reducing the extra space occupied in the thickness direction X.

[0176] In some embodiments, referring to Figures 6 to 8 , the first adapter 40 includes an adapter body 41, a first protrusion 42, and a second protrusion 43. Along the first direction Y, the adapter body 41 is connected between the first protrusion 42 and the second protrusion 43, and the first direction Y is perpendicular to the thickness direction X. At least part of the adapter body 41 is disposed on the side of the second limiting portion 33 away from the wall portion 23. Both the first protrusion 42 and the second protrusion 43 protrude from the surface of the adapter body 41 facing the second limiting portion 33. The first protrusion 42 is welded to the terminal body 31 to form a first welding portion W1. The second protrusion 43 is disposed on one side of the second limiting portion 33 along the first direction Y. At least part of the first tab 12 is located on the side of the second protrusion 43 close to the main body portion 11 and is connected to the second protrusion 43.

[0177] In some examples, at least part of the first protrusion 42 is received in the first through hole 313 and welded to the terminal body 31. The first welding portion W1 is connected to the outer peripheral surface of the first protrusion 42 and the hole wall of the first through hole 313.

[0178] In some other examples, a part of the first protrusion 42 is laminated and welded with the partition wall 315. The first welding portion W1 is connected to the surface of the first protrusion 42 facing the partition wall 315. Along the thickness direction X, the second limiting portion 33 and the adapter body 41 are spaced apart to reduce interference, which is beneficial to the first protrusion 42 being welded in contact with the partition wall 315.

[0179] In some examples, the second protrusion 43 is one and is disposed on either side of the second limiting portion 33 along the first direction Y.

[0180] In some other examples, the second protrusion 43 is two, and the two second protrusions 43 are respectively disposed on both sides of the second limiting portion 33 along the first direction Y.

[0181] The second protrusion 43 protrudes from the adapter body 41 towards the direction close to the wall portion 23. The surface of the adapter body 41 facing the main body portion 11 is closer to the main body portion 11 than the surface of the second protrusion 43 facing the main body portion 11. A receiving space can be formed on the side of the second protrusion 43 facing the main body portion 11 for receiving at least part of the first tab 12. The second protrusion 43 and the first tab 12 can share part of the space in the thickness direction X with the second limiting portion 33, which is beneficial to improving the space utilization rate and enhancing the energy density of the battery cell 6.

[0182] In other embodiments, referring to Fig.11 Along the thickness direction X, a portion of the first electrode tab 12 is located between the second limiting portion 33 and the first adapter 40 , and is connected to the first adapter 40 and the second limiting portion 33 .

[0183] A portion of the first tab 12 can be folded to a side of the first adapter 40 away from the main body 11. The bent portion of the first tab 12 can be located on one side of the first adapter 40 along the first direction Y, and share the space in the thickness direction X with the first adapter 40, which is beneficial to improve space utilization and energy density.

[0184] The first pole lug 12 is electrically connected to the first adapter 40 and the second limit portion 33. A current flow path is formed between the first pole lug 12 and the first adapter 40, and between the first pole lug 12 and the second limit portion 33. Part of the current can be directly transmitted between the first pole lug 12 and the first electrode terminal 30, which is beneficial to improving the current flow capacity of the battery cell 6.

[0185] In some embodiments, reference Figure 6 and Figure 7 The first electrode terminal 30 includes a first surface 30 a facing away from the main body 11 along the thickness direction X, and at least a portion of the second conductive portion 62 extends beyond the first surface 30 a along the direction from the main body 11 to the wall 23 .

[0186] Optionally, the first surface 30 a is a surface of the first limiting portion 32 facing away from the main body 11 .

[0187] The surface of the second conductive part 62 facing away from the main body 11 is farther away from the main body 11 than the first surface 30a, which is beneficial to reduce the risk of interference between the busbar component and the first electrode terminal 30 when connecting the busbar component and the second conductive part 62, and improve the connection reliability between the busbar component and the second conductive part 62.

[0188] In some embodiments, the first electrode terminal 30 includes a first surface 30a facing away from the main body 11 along the thickness direction X. The connection surface 63 of the first conductive portion 61 and the second conductive portion 62 is closer to the main body 11 than the first surface 30a, which is beneficial to reduce the possibility of the connection surface 63 being worn or bumped, reduce the risk of the connection surface 63 being broken, and improve the connection stability of the first conductive portion 61 and the second conductive portion 62.

[0189] In some embodiments, reference Figure 6 and Figure 7The wall portion 23 includes a second surface 23a facing away from the main body 11, and the first conductive member 60 is further away from the main body 11 than the second surface 23a. The first conductive member 60 is located outside the housing 20 as a whole, which is beneficial to the welding between the first conductive portion 61 and the first electrode terminal 30, and is beneficial to increasing the distance between the busbar component and the wall portion 23, thereby reducing the risk of short circuit caused by the overlap between the busbar component and the wall portion 23.

[0190] In some embodiments, the first conductive part 61 and the second conductive part 62 are connected by at least one of cold rolling, hot rolling, explosive compounding, and explosive rolling. This helps to improve the connection strength and stability between the first conductive part 61 and the second conductive part 62, and reduces the risk of the connection surfaces 63 of the first conductive part 61 and the second conductive part 62 being separated from each other.

[0191] In some embodiments, reference Figure 3 and Fig.12 The electrode assembly 10 includes a second pole tab 13 extending from the main body 11, and the second pole tab 13 has a polarity opposite to that of the first pole tab 12. The battery cell also includes a second electrode terminal 70 and a second adapter 80, and the second electrode terminal 70 is electrically connected to the second pole tab 13 and the second adapter 80. The base metal of the second electrode terminal 70 is the same as the base metal of the second conductive portion 62.

[0192] The first pole tab 12 and the second pole tab 13 may be led out from the same end of the main body 11 or from different ends of the main body 11. Optionally, the first pole tab 12 and the second pole tab 13 are both led out from the end of the main body 11 facing the wall 23.

[0193] Optionally, the first electrode tab 12 is a negative electrode tab, and the second electrode tab 13 is a positive electrode tab. The second electrode terminal 70 and the second conductive part 62 can be made of aluminum or aluminum alloy. The base metal of the second electrode terminal 70 and the base metal of the second conductive part 62 can both be aluminum.

[0194] The second electrode terminal 70 is used to be directly or indirectly connected to the busbar component. The base metal of the second electrode terminal 70 is the same as the base metal of the second conductive portion 62. The second conductive portion 62 of one battery cell 6 and the second electrode terminal 70 of another battery cell 6 can be welded to the same busbar component, which is conducive to realizing the series connection between the two battery cells 6 and reducing the difficulty of connection.

[0195] In some embodiments, reference Fig.12, a fourth recess 71 is provided on a side of the second electrode terminal 70 away from the main body 11. The second electrode terminal 70 is provided with a second through hole 72, and the second through hole 72 penetrates the second bottom wall 73 of the fourth recess 71 along the thickness direction X. At least part of the second adapter 80 is accommodated in the second through hole 72 and is welded with the second electrode terminal 70 to form a third welding portion W3, and the third welding portion W3 is exposed in the fourth recess 71. The battery cell 6 includes a second conductive member 90, which is welded to the second electrode terminal 70 and is used to connect to the busbar component. Along the thickness direction X, the second conductive member 90 covers the fourth recess 71.

[0196] The portion of the second adapter 80 received in the second through hole 72 is welded to the second electrode terminal 70 by butt welding. The third welding portion W3 emerges and is exposed from the fourth recess 71 .

[0197] During assembly, the second pole ear 13 can be first connected to the second adapter 80 and bent; then the electrode assembly 10 and the first adapter 40 are installed as a whole in the shell 21, and the wall portion 23 is assembled to the shell 21; then the second adapter 80 and the second electrode terminal 70 are welded from the side of the second electrode terminal 70 away from the main body 11; finally, the second conductive member 90 is assembled to the second electrode terminal 70, and the second conductive member 90 and the second electrode terminal 70 are welded.

[0198] The second adapter 80 and the second electrode terminal 70 are welded from the outside, which is beneficial to reduce the possibility of welding particles generated during welding falling into the housing 20, reduce the risk of internal short circuit, and improve the reliability of the battery cell 6. The second conductive member 90 can cover the third welding portion W3 exposed from the outside of the second electrode terminal 70, reducing the risk of corrosion of the third welding portion W3.

[0199] Optionally, the structure of the second adapter 80 is the same as that of the first adapter 40 , and will not be described in detail herein.

[0200] In some embodiments, the base metal of the first conductive portion 61 and the base metal of the first electrode terminal 30 are both copper. The base metal of the second conductive portion 62 is aluminum.

[0201] Accordingly, the base metal of the first adapter 40 is copper, and the base metal of the second conductive part 62 is aluminum. The base metals of the second electrode terminal 70, the second adapter 80, and the second conductive member 90 are all aluminum.

[0202] In some embodiments, the housing 20 includes a shell 21 and an end cover 22, wherein the shell 21 has an opening 211, and the end cover 22 is connected to the shell 21 and covers the opening 211. The wall portion 23 is the end cover 22.

[0203] The end cover 22 may be connected to the housing 21 by welding, clamping, bonding or other suitable methods.

[0204] The shell 21 and the end cover 22 are separate structures, and the first electrode terminal 30 is arranged on the end cover 22. During assembly, the electrode assembly 10 and the first adapter 40 can be installed in the shell 21 through the opening 211, and then the end cover 22 is covered on the opening 211, and then the first adapter 40 and the first electrode terminal 30 are welded, which is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0205] According to the second aspect of the present application, an embodiment of the present application provides a battery device 2, referring to Figure 2 and Fig.13 The battery device 2 includes a busbar component 7 and a battery cell 6 provided according to some embodiments of the first aspect of the present application. The base metal of the busbar component 7 is the same as the base metal of the second conductive part 62 , and the busbar component 7 is welded to the second conductive part 62 .

[0206] Optionally, the first pole ear 12 is a negative pole ear, and the negative pole ear is made of copper. The first electrode terminal 30 and the first adapter 40 can be made of copper or copper alloy, and the base metals of the first electrode terminal 30, the first adapter 40 and the first conductive part 61 are all copper, which is convenient for welding. The second conductive part 62 and the converging part 7 can be made of aluminum or aluminum alloy, and the base metals of the second conductive part 62 and the converging part 7 are aluminum, which is convenient for welding the two.

[0207] In the embodiment of the present application, the base metal of the busbar component 7 and the base metal of the second conductive part 62 are set to be the same, which is conducive to welding the two and improves welding efficiency and welding effect.

[0208] In some embodiments, the battery device 2 includes a plurality of battery cells 6 . The busbar component 7 is welded to the second conductive portion 62 of one battery cell 6 and the second conductive member 90 of another battery cell 6 .

[0209] According to the third aspect of the present application, an embodiment of the present application further provides an electrical device, the electrical device comprising a battery device 2 provided according to any embodiment of the second aspect of the present application, the battery device 2 being used to provide electrical energy.

[0210] The battery cell 6 provided in the embodiment of the present application includes an electrode assembly 10, a shell 20, a first electrode terminal 30, a first adapter 40, a sealing member 50 and a first conductive member 60. The shell 20 includes a wall portion 23, and the wall portion 23 is provided with an electrode lead-out hole 231. The electrode assembly 10 is accommodated in the shell 20, and the electrode assembly 10 includes a main body 11 and a first pole ear 12 led out from the main body 11. The first adapter 40 is connected to the first pole ear 12. The first electrode terminal 30 is fixedly arranged on the wall portion 23. The first electrode terminal 30 includes a terminal body 31, a first limiting portion 32 and a second limiting portion 33. The first limiting portion 32 is at least partially arranged on a side of the wall portion 23 away from the main body 11, and the second limiting portion 33 is at least partially arranged on a side of the wall portion 23 close to the main body 11. At least a portion of the terminal body 31 is accommodated in the electrode lead-out hole 231 and connects the first limiting portion 32 and the second limiting portion 33. Along the thickness direction X, at least part of the sealing member 50 is disposed between the wall portion 23 and the second limiting portion 33. A first recess 311 is disposed on the side of the terminal body 31 away from the main body 11, and the first conductive member 60 covers the first recess 311. The terminal body 31 is provided with a first through hole 313, and the first through hole 313 penetrates the first bottom wall 312 of the first recess 311 along the thickness direction X. A portion of the first adapter 40 is accommodated in the first through hole 313 and is welded with the terminal body 31 to form a first welding portion W1, and the first welding portion W1 is exposed in the first recess 311. The first conductive portion 61 is welded to the terminal body 31. Along the thickness direction X of the wall portion 23, at least part of the sealing member 50 is disposed between the first electrode terminal 30 and the wall portion 23. The first conductive member 60 is disposed on the side of the first welding portion W1 away from the main body 11 and is used to cover the first welding portion W1. The first conductive member 60 includes a first conductive portion 61 and a second conductive portion 62 connected to each other, the base metals of the first conductive portion 61 and the second conductive portion 62 are different, the base metals of the first conductive portion 61 and the first electrode terminal 30 are the same, and the first conductive portion 61 is welded to the first electrode terminal 30. Along the thickness direction X of the wall portion 23, at least a portion of the second conductive portion 62 is located on a side of the first conductive portion 61 away from the main body portion 11 and is used to connect to the busbar component.

[0211] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents; 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 all be included in the scope of the claims and specification of the present application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way. The present application is not limited to the specific embodiments disclosed herein, but includes all technical solutions that fall within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a wall portion, wherein the wall portion is provided with an electrode lead-out hole; An electrode assembly is contained in the housing, and includes a main body and a first electrode tab extending from the main body; A first adapter, connected to the first pole lug; a first electrode terminal fixedly disposed on the wall portion and partially accommodated in the electrode lead-out hole, the first electrode terminal and the first adapter being welded to form a first welding portion, the first welding portion being exposed on a side of the first electrode terminal away from the main body portion; a sealing member, along a thickness direction of the wall portion, wherein at least a portion of the sealing member is disposed between the first electrode terminal and the wall portion; as well as A first conductive member is arranged on a side of the first welding portion away from the main body and is used to cover the first welding portion, the first conductive member includes a first conductive portion and a second conductive portion connected to each other, the base metals of the first conductive portion and the second conductive portion are different, the base metals of the first conductive portion and the first electrode terminal are the same, the first conductive portion is welded to the first electrode terminal, and along the thickness direction of the wall portion, at least a portion of the second conductive portion is located on a side of the first conductive portion away from the main body and is used to be connected to the busbar component.

2. The battery cell according to claim 1, characterized in that: The first electrode terminal comprises a terminal body, a first limiting portion and a second limiting portion, wherein the first limiting portion is at least partially disposed on a side of the wall portion away from the main portion, and the second limiting portion is at least partially disposed on a side of the wall portion close to the main portion, and at least a portion of the terminal body is accommodated in the electrode lead-out hole and connects the first limiting portion and the second limiting portion; Along the thickness direction, at least a portion of the sealing member is disposed between the wall portion and the second limiting portion; The terminal body and the first adapter are welded to form the first welding portion, and the first conductive portion is welded to the terminal body.

3. The battery cell according to claim 2, characterized in that: A first recess is provided on one side of the terminal body away from the main body, the first conductive member covers the first recess, a first bottom wall of the first recess is welded to the first adapter and forms the first welding portion, and the first welding portion is exposed in the first recess.

4. The battery cell according to claim 3, characterized in that: Along the thickness direction, the first conductive portion and the first welding portion are arranged at intervals.

5. The battery cell according to claim 3 or 4, characterized in that: The first welding portion is spaced apart from a side wall of the first recess.

6. The battery cell according to claim 3 or 4, characterized in that: The terminal body is provided with a first through hole, and the first through hole penetrates the first bottom wall of the first recess along the thickness direction; A portion of the first transition member is received in the first through hole and is welded to the terminal body to form the first welding portion.

7. The battery cell according to claim 3 or 4, characterized in that: A second recess is provided on one side of the terminal body close to the main body, and the terminal body includes a partition wall, and along the thickness direction, the partition wall separates the first recess and the second recess; At least a portion of the first transition member is accommodated in the second recess, and the first transition member is welded to the partition wall to form the first welding portion.

8. The battery cell according to claim 7, characterized in that: In the same plane perpendicular to the thickness direction, the orthographic projection range of the first recess exceeds the orthographic projection range of the second recess.

9. The battery cell according to claim 3 or 4, characterized in that: The first conductive portion is at least partially accommodated in the first recess and welded to a side wall of the first recess.

10. The battery cell according to claim 3 or 4, characterized in that: The first recess includes a first sub-recess and a second sub-recess, the first sub-recess and the second sub-recess are arranged along a direction from the main body to the wall, and in the same plane perpendicular to the thickness direction, an orthographic projection range of the second sub-recess exceeds an orthographic projection range of the first sub-recess; The first conductive portion is at least partially accommodated in the second sub-recess and is welded to a side wall of the second sub-recess.

11. The battery cell according to claim 10, characterized in that: The first concave portion includes a third sub-concave portion, the first sub-concave portion, the second sub-concave portion and the third sub-concave portion are arranged in sequence along a direction from the main body portion to the wall portion, and in the same plane perpendicular to the thickness direction, an orthographic projection range of the third sub-concave portion exceeds an orthographic projection range of the second sub-concave portion; The first conductive portion is welded to the terminal body to form a second welded portion, the second welded portion is connected to a side surface of the second sub-recess and a first outer peripheral surface of the first conductive portion, and a portion of the second welded portion is accommodated in the third sub-recess.

12. The battery cell according to claim 9, characterized in that: The first conductive portion includes a first conductive sub-portion and a second conductive sub-portion, the first conductive sub-portion and the second conductive sub-portion are stacked in a direction from the main body portion to the wall portion, the second conductive sub-portion surrounds the first conductive sub-portion and protrudes from a second outer peripheral surface of the second conductive portion, and the second conductive sub-portion is welded to the side wall of the first recess; A third recess is disposed on a side of the second conductive portion facing the second conductive portion.

13. The battery cell according to any one of claims 2 to 4, characterized in that: The thickness of the second limiting portion is greater than the thickness of the first limiting portion.

14. The battery cell according to any one of claims 2 to 4, characterized in that: The first adapter comprises an adapter body, a first convex portion and a second convex portion, and the adapter body is connected between the first convex portion and the second convex portion along a first direction, and the first direction is perpendicular to the thickness direction; At least a portion of the adapter body is disposed on a side of the second limiting portion away from the wall portion, the first convex portion and the second convex portion both protrude from a surface of the adapter body facing the second limiting portion, the first convex portion is welded with the terminal body to form the first welding portion, and the second convex portion is disposed on a side of the second limiting portion along the first direction; At least a portion of the first electrode tab is located on a side of the second protrusion close to the main body and is connected to the second protrusion.

15. The battery cell according to any one of claims 2 to 4, characterized in that: Along the thickness direction, a portion of the first electrode tab is located between the second limiting portion and the first adapter, and is connected to the first adapter and the second limiting portion.

16. The battery cell according to any one of claims 1 to 4, characterized in that: The first electrode terminal includes a first surface facing away from the main body along the thickness direction, and at least a portion of the second conductive portion extends beyond the first surface along a direction from the main body to the wall.

17. The battery cell according to any one of claims 1 to 4, characterized in that: The first conductive part and the second conductive part are connected by at least one of cold rolling, hot rolling, explosive composite method and explosive rolling method.

18. The battery cell according to any one of claims 1 to 4, characterized in that: The electrode assembly includes a second electrode tab extending from the main body, wherein the second electrode tab has a polarity opposite to that of the first electrode tab; The battery cell further includes a second electrode terminal and a second adapter, wherein the second electrode terminal is electrically connected to the second electrode tab and the second adapter; A base metal of the second electrode terminal is the same as a base metal of the second conductive portion.

19. The battery cell according to claim 18, characterized in that: A fourth recess is provided on a side of the second electrode terminal away from the main body, the second electrode terminal is provided with a second through hole, the second through hole penetrates through the second bottom wall of the fourth recess along the thickness direction, at least a portion of the second adapter is accommodated in the second through hole and is welded with the second electrode terminal to form a third welding portion, and the third welding portion is exposed in the fourth recess; The battery cell includes a second conductive member, which is welded to the second electrode terminal and used to be connected to the busbar component. The second conductive member covers the fourth recess along the thickness direction.

20. The battery cell according to any one of claims 1 to 4, characterized in that: The base metal of the first conductive part and the base metal of the first electrode terminal are both copper; The base metal of the second conductive part is aluminum.

21. The battery cell according to any one of claims 1 to 4, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, and the end cover is connected to the shell and covers the opening; The wall portion is the end cover.

22. A battery device, characterized in that: include: A battery cell according to any one of claims 1 to 21; as well as A busbar component, wherein a base metal of the busbar component is the same as a base metal of the second conductive portion, and the busbar component is welded to the second conductive portion.

23. An electrical equipment, characterized in that: Comprising a battery device according to claim 22, the battery device is used to provide electrical energy.

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