Battery monomer, battery device and electric equipment

Abstract

The invention discloses a battery monomer, a battery device and electric equipment. The battery cell includes a housing, an electrode assembly, a first electrode terminal, and a first adapter. The shell comprises a wall part, and the wall part is provided with an electrode lead-out hole. The electrode assembly is accommodated in the shell and comprises a main body part and a first tab; the first electrode terminal comprises a first terminal part and a second terminal part which are connected with each other and are different in base metal, the first terminal part is provided with a first through hole which penetrates through the first terminal part in the thickness direction of the wall part, and the second terminal part is arranged on the side, opposite to the main body part, of the wall part and is used for being connected with the confluence component; the second terminal portion is provided along an outer periphery of a portion of the first terminal portion, and is laminated with another portion of the first terminal portion in a thickness direction. The first adapter is connected to the first tab, the base metal of the first adapter is the same as the base metal of the first terminal part, and at least part of the first adapter is accommodated in the first through hole and welded to the first terminal part.

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 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 of the battery cell.

[0005] According to the first aspect of the present application, the present application provides a battery cell, which includes a shell, an electrode assembly, a first electrode terminal and a first adapter. The shell includes a wall portion, and the wall portion is provided with an electrode lead-out hole. The electrode assembly is accommodated in the shell, and the electrode assembly includes a main body portion and a first pole ear led out from the main body portion. The first electrode terminal includes a first terminal portion and a second terminal portion connected to each other, the base metal of the first terminal portion and the base metal of the second terminal portion are different, the first terminal portion is at least partially arranged in the electrode lead-out hole, the first terminal portion is provided with a first through hole, the first through hole penetrates the first terminal portion along the thickness direction of the wall portion, the second terminal portion is arranged on the side of the wall portion facing away from the main body portion and is used to connect with the current collection component, the second terminal portion is arranged along the outer periphery of a part of the first terminal portion, and is stacked with another part of the first terminal portion along the thickness direction. The first adapter is connected to the first pole ear, the base metal of the first adapter is the same as the base metal of the first terminal portion, and at least a part of the first adapter is accommodated in the first through hole and welded to the first terminal portion.

[0006] During assembly, the first pole ear can be connected to the first adapter first, and the first pole ear can be bent; then the electrode assembly and the first adapter can be installed as a whole on the shell; then the wall can be assembled to the shell, and finally the first adapter and the first terminal can be welded. Specifically, the first terminal can be welded to the seam by heating the part of the first adapter that is accommodated in the first through hole from the outside of the first terminal back to the main body by laser or other means, which can reduce the possibility of welding particles generated during welding falling into the side of the first adapter facing the electrode assembly, reduce the risk of internal short circuit of the battery cell, and help improve the reliability of the battery cell. In addition, the first pole ear and the first adapter are first inserted into the shell, and then the first adapter and the first terminal are welded. On the one hand, the length of the first pole ear drawn out from the main body can be shortened, saving the space required for bending the first pole ear, which is conducive to improving the energy density of the battery cell; on the other hand, the first pole ear and the first adapter are in a natural state, which can reduce external force pulling and reduce the risk of cracking of the first pole ear.

[0007] In some embodiments, the first terminal portion includes a first terminal body and a first limiting portion, the first through hole is provided in the first terminal body and penetrates the first terminal body in the thickness direction, the first adapter is welded to the first terminal body, the first limiting portion is connected to the first terminal body and protrudes from the outer peripheral surface of the first terminal body, and the first limiting portion is located on the side of the wall portion facing away from the main body; the second terminal portion is stacked with the first limiting portion and connected to the side of the first limiting portion facing away from the wall portion; along the direction of the main body pointing to the wall portion, the first terminal body exceeds the surface of the first limiting portion facing away from the wall portion, and the second terminal portion is located on the outer periphery of the portion of the first terminal body that exceeds the first limiting portion. In the thickness direction, there is no thickness overlap between the second terminal portion and the wall portion, which can increase the distance between the surface of the second terminal portion facing away from the wall portion and the wall portion. After the second terminal portion is connected to the confluence component, the second terminal portion can prop up the confluence component to a certain height in the thickness direction to increase the spacing between the confluence component and the wall portion, which is conducive to reducing the risk of overlap between the confluence component and the wall portion.

[0008] In some embodiments, the second terminal portion is connected to the first terminal body. The second terminal portion is connected to the first limit portion and the first terminal body at the same time, and there are at least two connection surfaces between the second terminal portion and the first terminal portion, which is conducive to increasing the connection area and flow area between the two, enhancing the connection strength and connection stability between the two, and improving the flow capacity.

[0009] In some embodiments, the second terminal portion is provided with a second through hole, the second through hole penetrates the second terminal portion along the thickness direction of the wall portion, a portion of the first terminal body is accommodated in the second through hole and connected to at least a portion of the hole wall of the second through hole. Thus, the connection area and the flow area of ​​the first terminal body and the second terminal portion can be further increased, which is conducive to further enhancing the connection strength and connection stability between the two and improving the flow capacity.

[0010] In some embodiments, along the thickness direction, the second through hole has a first end close to the first limiting portion and a second end away from the first limiting portion, and in the same plane perpendicular to the thickness direction, the orthographic projection of the first end is located within the orthographic projection of the second end, and the orthographic projection range of the second end exceeds the orthographic projection range of the first end. In the thickness direction, a portion of the first terminal body may be located on the side of a portion of the second terminal portion facing away from the wall portion, and the portion of the first terminal body may have a limiting effect on the portion of the second terminal portion, so that the second terminal portion presses the first limiting portion along the thickness direction, which is beneficial to improving the connection strength and connection stability between the first terminal portion and the second terminal portion.

[0011] In some embodiments, the cross section of the second through hole perpendicular to the thickness direction is circular, and the hole wall of the second through hole is inclined inwardly along the radial direction of the second through hole in the direction of the wall portion pointing to the main body. The first terminal body can not only generate a force on the second terminal portion toward the first limiting portion along the thickness direction, which is conducive to the second terminal portion pressing the first limiting portion along the thickness direction, but also the first terminal body can generate a force on the second terminal portion in the radial direction of the second through hole, which is conducive to the first terminal body pressing the second terminal portion along the radial direction of the second through hole, thereby improving the overall connection strength and connection stability of the first terminal portion and the second terminal portion.

[0012] In some embodiments, the portion of the first adapter accommodated in the first through hole has a first surface facing away from the main body, and the first terminal body has a second surface facing away from the main body; the portion of the first adapter accommodated in the first through hole is welded with the first terminal part to form a first welding portion, and the first welding portion connects the first surface and the second surface. In the thickness direction, the first surface and the second surface can be arranged flush, which is conducive to reducing the difficulty of seam welding between the first adapter and the first terminal body and improving the welding effect.

[0013] In some embodiments, at least a portion of the first terminal body is accommodated in the electrode lead-out hole; the first electrode terminal further includes a second limiting portion, the second limiting portion protrudes from the outer peripheral surface of the first terminal body, and a portion of the wall portion is located between the first limiting portion and the second limiting portion along the thickness direction of the wall portion. At least a portion of the first limiting portion and at least a portion of the second limiting portion are respectively arranged on both sides of the wall portion along the thickness direction, so that the first terminal portion can be limited in the thickness direction, reducing the risk of the first terminal portion falling into or outside the housing.

[0014] In some embodiments, along the thickness direction, a portion of the first pole tab is located between the second limiting portion and the first adapter, and a portion of the first pole tab is more likely to contact the second limiting portion, thereby forming a current path between the first pole tab and the second limiting portion.

[0015] In some embodiments, the portion of the first pole tab located between the second limit portion and the first adapter is connected to the second limit portion. The portion of the first pole tab located between the second limit portion and the first adapter may contact the second limit portion, thereby being electrically connected to the second limit portion, and a flow path may be formed between the first pole tab and the first terminal portion, so that part of the current may be directly transmitted between the first pole tab and the first terminal portion, which is beneficial to improving the flow capacity of the battery cell.

[0016] In some embodiments, the first pole ear includes a folded section, a bent section, and an extended section. The folded section is located on the side of the first adapter facing the main body and connected to the main body. The bent section is located on the side of the first adapter along the width direction of the wall. The bent section is connected between the folded section and the extended section. The extended section extends from the bent section to between the second limit portion and the first adapter. The extended section is welded to the first adapter and attached to the surface of the second limit portion facing the main body. The bent section and the first adapter can share at least part of the space in the thickness direction, which is beneficial to improve space utilization. In addition, the first pole ear only needs to be bent once, and there is no need to reserve a large bending space for the first pole ear between the first adapter and the main body, which is beneficial to improve the space utilization in the shell and improve the energy density of the battery cell.

[0017] In some embodiments, the battery cell includes a fixing member, the fixing member is at least partially disposed on a side of the first limiting portion away from the wall portion, and the fixing member is connected to the wall portion. A portion of the fixing member is disposed on a side of the first electrode terminal away from the wall portion, and the fixing member can apply a force toward the wall portion to the first electrode terminal, which is conducive to pressing the first electrode terminal against the wall portion, realizing the assembly of the first electrode terminal and the wall portion, and can also improve the sealing performance of the battery cell.

[0018] In some embodiments, the fixing member includes a first fixing portion and a second fixing portion connected to each other, the first fixing portion is at least partially arranged on a side of the first limiting portion away from the wall portion, and the second fixing portion is fixed to the wall portion; along the thickness direction of the wall portion, a portion of the first limiting portion and / or a portion of the second terminal portion is located between the first fixing portion and the wall portion. The first fixing portion can apply a force toward the wall portion to the first terminal portion and / or the second terminal portion, thereby directly pressing the first terminal portion against the wall portion, or indirectly pressing the first terminal portion against the wall portion through the second terminal portion. When a portion of the second terminal portion is located between the first fixing portion and the wall portion, or when a portion of the first terminal portion and a portion of the second terminal portion are both located between the first fixing portion and the wall portion, the first fixing portion can also cause the second terminal portion to be pressed against the first terminal portion, which is beneficial to improving the connection strength and connection stability between the first terminal portion and the second terminal portion.

[0019] In some embodiments, the first adapter includes a first adapter body and a first protrusion, the first adapter body is arranged on the side of the wall portion facing the main body and connected to the first pole ear, the first protrusion protrudes from the surface of the first adapter body facing the wall portion, and at least part of the first protrusion is accommodated in the first through hole and welded to the first terminal portion. Thus, it is beneficial to shorten the length of the first pole ear led out from the main body, and it is convenient to connect the first adapter body and the first pole ear. The first protrusion protrudes from the first adapter body, which can enhance the overall structural strength of the first adapter and reduce the risk of deformation during welding.

[0020] In some embodiments, the first convex portion is a solid structure, thereby increasing the flow area of ​​the first convex portion and improving the deformation resistance of the first convex portion, which is beneficial to improving the flow capacity and overall strength of the first adapter.

[0021] In some embodiments, along the thickness direction of the wall portion, a portion of the first pole lug is located between the first terminal portion and the first adapter body, and is connected to the first adapter body. Thus, a portion of the first pole lug can be accommodated by utilizing the gap between the first adapter body and the first terminal portion, which is beneficial to saving the folded pole lug space between the first adapter body and the main body portion. In addition, the possibility of the first pole lug contacting the first terminal portion to directly form a current path between the first pole lug and the first terminal portion can also be increased.

[0022] In some embodiments, the second terminal portion has a third surface away from the main body portion in the thickness direction, and the first terminal portion and the first adapter do not extend beyond the third surface in the direction from the main body portion to the wall portion. When the second terminal portion is connected to the busbar component, the first terminal portion and the first adapter are not likely to interfere with the busbar component, which is beneficial to reducing the gap between the second terminal portion and the busbar component and improving the connection effect between the two.

[0023] In some embodiments, the first adapter is welded to the first terminal portion to form a first welding portion; the second terminal portion has a third surface away from the main portion along the thickness direction, and the first welding portion does not extend beyond the third surface along the direction from the main portion to the wall portion. When the second terminal portion is connected to the busbar component, the first welding portion is not likely to interfere with the busbar component, which is beneficial to reducing the gap between the second terminal portion and the busbar component and improving the connection effect between the two.

[0024] 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 adapter connects the second pole lug and the second electrode terminal; the base metal of the second electrode terminal is the same as the base metal of the second terminal portion. The second terminal 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.

[0025] In some embodiments, the battery cell includes a busbar, at least part of which is located on a side of the second electrode terminal away from the main body; the busbar, the second adapter and the second electrode terminal are welded, and the base metal of the busbar, the base metal of the second adapter and the base metal of the second electrode terminal are the same. Thus, it is convenient to weld the busbar, the second adapter and the second electrode terminal together through a single welding process, which is conducive to simplifying the welding operation and improving the welding efficiency. In addition, the busbar can be directly electrically connected to the second adapter through the second welding portion, which is conducive to improving the current carrying capacity.

[0026] In some embodiments, the base metal of the first terminal portion and the base metal of the first adapter are both copper, and the base metal of the second terminal portion is aluminum. This facilitates welding between the first adapter and the first tab, welding between the first terminal portion and the first adapter, welding between the second terminal portion and the busbar, and welding between the busbar and the positive electrode of another battery cell.

[0027] In some embodiments, the first terminal portion and the second terminal portion 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 terminal portion and the second terminal portion and reducing the risk of the connection surfaces of the first terminal portion and the second terminal portion being separated from each other.

[0028] In some embodiments, the housing includes a shell and an end cap, the shell has an opening, the end cap is connected to the shell and covers the opening; the wall portion is the end cap. During assembly, the electrode assembly and the first adapter can be installed in the shell through the opening, and then the end cap is covered on the opening, and then the first adapter and the first terminal are welded, which is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0029] According to the second aspect of the present application, an embodiment of the present application provides a battery device, which includes a battery cell and a busbar component provided according to some embodiments of the first aspect. The base metal of the busbar component is the same as the base metal of the second terminal portion, and the busbar component is welded to the second terminal portion.

[0030] 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, the second electrode terminal is electrically connected to the second pole lug, the base metal of the second electrode terminal, the base metal of the second terminal portion, and the metal base of the busbar are the same; there are multiple battery cells; the busbar is welded to at least the second terminal portion of one battery cell and the second electrode terminal of another battery cell. The second terminal 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.

[0031] According to the second aspect of the present application, embodiments of the present application provide a battery device, which includes the battery cells provided by some embodiments of the first aspect of the present application.

[0032] According to the third aspect of the present application, an embodiment of the present application provides an electrical device, which includes a battery device provided by 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

[0033] 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 creative work.

[0034] Figure 1 It is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.

[0035] Figure 2 It is a schematic diagram of the exploded structure of a battery device provided in some embodiments of the present application.

[0036] Figure 3 It is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0037] Figure 4 yes Figure 3 A schematic cross-sectional view of a battery cell is shown.

[0038] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of area A in the middle.

[0039] Figure 6 yes Figure 5 An exploded view of the local structure in .

[0040] Figure 7 is along Figure 4 Schematic cross-sectional view taken along direction BB.

[0041] Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of area C in the middle.

[0042] Fig. 9 It is a schematic diagram of the structure of the electrode assembly of the battery cell provided in some embodiments of the present application.

[0043] Fig.10 yes Fig. 9 Schematic diagram of the enlarged structure of area D in the middle.

[0044] Fig.11It is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0045] Fig.12 yes Fig.11 Schematic diagram of the enlarged structure of area E in the middle.

[0046] Fig.13 yes Figure 4 Schematic diagram of the enlarged structure of area F in the middle.

[0047] Fig.14 It is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0048] Fig.15 It is a partial structural schematic diagram of a battery device provided in some embodiments of the present application.

[0049] In the attached figure: Vehicle 1, battery device 2, controller 3, motor 4; Box body 5, first box body part 5a, second box body part 5b, accommodating space 5c; Electrode assembly 10, main body 11, first pole ear 12, folded section 121, bent section 122, extended section 123, second pole ear 13, shell 20, shell 21, opening 211, end cover 22, wall 23, electrode lead hole 231, first electrode terminal 30, first terminal portion 31, first through hole 311, first terminal body 312, second surface 312a, first limiting portion 313, second limiting portion 314, second terminal portion 32, second through hole 321, first end 3 21a, second end 321b, hole wall 321c, second terminal body 322, step portion 323, step surface 323a, third surface 32a, first adapter 40, first adapter body 41, first protrusion 42, first surface 42a, fixing member 51, first fixing portion 511, second fixing portion 512, insulating member 52, second electrode terminal 60, second adapter 70, busbar component 80, first welding portion W1, second welding portion W2, thickness direction X, width direction Y. DETAILED DESCRIPTION

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The term “plurality” used in this application refers to two or more (including two).

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] In some embodiments, a separator is disposed between the positive electrode and the negative electrode.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In some embodiments, the electrode assembly is a laminate structure.

[0069] 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.

[0070] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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.

[0075] The electrode assembly usually includes a main body and a tab extending from the main body, and the tab is usually connected to the electrode terminal through an adapter. In the related art, the tab can be welded to the adapter first, and the adapter can be welded to the electrode terminal from one side of the adapter, and then the adapter, the electrode terminal and the electrode assembly are installed into the shell. However, welding particles generated during the welding process may remain on the adapter and then enter the interior of the shell, which may cause a short circuit inside the battery cell, thereby affecting the reliability of the battery cell.

[0076] In view of this, an embodiment of the present application provides a technical solution, which, by configuring the first electrode terminal to include a first terminal portion and a second terminal portion with different base metals, and configuring at least a portion of the first adapter in the first through hole of the first terminal portion and welded to the first terminal portion, can firstly install the electrode assembly and the first adapter to the outer shell, and then butt weld the first terminal portion and the first adapter from the outside of the first terminal portion facing away from the electrode assembly by laser or other suitable means, thereby reducing the possibility of welding particles generated during the welding process falling into the inner side of the first adapter facing the electrode assembly, reducing the risk of internal short circuit in the battery cell, and helping to improve the reliability of the battery cell.

[0077] 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.

[0078] 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.

[0079] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0080] Figure 1 is a schematic diagram of the structure of a vehicle provided in 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.

[0081] 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.

[0082] 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.

[0083] In order to improve the sealing performance after the first box body 5a and the second box body 5b are connected, a sealing member, such as a sealant, a sealing ring, etc., may also be provided between the first box body 5a and the second box body 5b.

[0084] 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.

[0085] 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.

[0086] For example, the battery cell 6 may be the smallest unit constituting the battery device 2 .

[0087] 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 housing 20 , and the electrode assembly 10 is disposed in the housing 20 .

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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 .

[0092] 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.

[0093] 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 .

[0094] 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.

[0095] The end cover 22 can be connected to the housing 21 by welding, bonding, clamping or other methods.

[0096] 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.

[0097] Figure 4 yes Figure 3 A schematic cross-sectional view of a battery cell is shown, Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of area A in the middle. Figure 6 yes Figure 5The exploded view of the local structure in Figure 7 is along Figure 4 A cross-sectional view taken along the direction BB in FIG. Figure 8 yes Figure 7 Schematic diagram of the enlarged structure of area C in the middle. Fig. 9 is a schematic diagram of the structure of an electrode assembly of a battery cell provided in some embodiments of the present application, Fig.10 yes Fig. 9 Schematic diagram of the enlarged structure of area D in the middle. Fig.11 is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application, Fig.12 yes Fig.11 Schematic diagram of the enlarged structure of area E in the middle. Fig.13 yes Figure 4 Schematic diagram of the enlarged structure of the middle area F, Fig.14 It is a partial structural cross-sectional view of a battery cell provided in some other embodiments of the present application.

[0098] Reference Figures 3 to 14 The embodiment of the present application provides a battery cell 6, which includes an electrode assembly 10, a shell 20, a first electrode terminal 30 and a first adapter 40. 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 electrode tab 12 led out from the main body 11. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 connected to each other, and the base metal of the first terminal portion 31 and the base metal of the second terminal portion 32 are different. The first terminal portion 31 is at least partially arranged in the electrode lead-out hole 231. The first terminal portion 31 is provided with a first through hole 311, and the first through hole 311 penetrates the first terminal portion 31 along the thickness direction X of the wall portion 23. The second terminal portion 32 is arranged on the side of the wall portion 23 facing away from the main body 11 and is used to connect with the current collection component. The second terminal portion 32 is arranged along the outer periphery of a part of the first terminal portion 31 and is stacked with another part of the first terminal portion 31 along the thickness direction X. The first adapter 40 is connected to the first tab 12 . The base metal of the first adapter 40 is the same as the base metal of the first terminal portion 31 . At least a portion of the first adapter 40 is accommodated in the first through hole 311 and welded to the first terminal portion 31 .

[0099] 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 .

[0100] 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 .

[0101] The first electrode tab 12 can be connected to the first adapter 40 by welding, abutment or other suitable methods.

[0102] In the embodiment of the present application, “base metal” refers to the main metal component. The main metal component of the first terminal portion 31 is different from the main metal component of the second terminal portion 32, and the main metal component of the first adapter 40 is the same as the main metal component of the first terminal portion 31, so as to facilitate welding of the first adapter 40 and the first terminal portion 31.

[0103] Optionally, the first electrode tab 12 is a negative electrode tab. The first terminal portion 31 and the first adapter 40 may be made of copper or copper alloy, and the base metals of the first terminal portion 31 and the first adapter 40 are both copper. The second terminal portion 32 may be made of aluminum or aluminum alloy, and the base metal of the second terminal portion 32 is aluminum.

[0104] The first terminal portion 31 may be partially accommodated in the electrode lead-out hole 231 , or may be partially disposed on at least one side of the electrode lead-out hole 231 along the thickness direction X.

[0105] The first terminal portion 31 may be a ring-shaped structure surrounding the first through hole 311. Optionally, in a projection plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 311 may be a circle, a rectangle or other shapes.

[0106] The second terminal portion 32 is integrally disposed on the outer side of the wall portion 23 facing away from the main body portion 11, which is convenient for connection with the busbar component. The second terminal portion 32 can be connected to the busbar component by welding, bonding or other appropriate methods.

[0107] Optionally, the base metal of the second terminal portion 32 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.

[0108] The first adapter 40 may be entirely accommodated in the first through hole 311 , or only a portion of the first adapter 40 may be accommodated in the first through hole 311 . The other portion of the first adapter 40 may, for example, be disposed on a side of the wall portion 23 facing the main body portion 11 to facilitate connection with the first electrode tab 12 .

[0109] The portion of the first adapter 40 received in the first through hole 311 is welded to the first terminal portion 31 to form a first welding portion W1 . The first welding portion W1 is directly connected to the outer peripheral wall of the portion of the first adapter 40 received in the first through hole 311 and the hole wall of the first through hole 311 .

[0110] Optionally, the first welding portion W1 may be an annular structure to increase the welding area between the first adapter 40 and the first terminal portion 31, improve the welding strength and welding stability between the two, and enhance the current carrying capacity. In addition, the annular first welding portion W1 may also form a seal between the mating interface of the first adapter 40 and the first terminal portion 31, which is beneficial to improving the sealing performance of the battery cell 6.

[0111] The first adapter 40 and the first terminal portion 31 can be welded by butt welding. Specifically, the outer peripheral wall of the portion of the first adapter 40 accommodated in the first through hole 311 and the hole wall of the first through hole 311 can be heated by laser or other suitable methods, so that the portion of the first adapter 40 accommodated in the first through hole 311 and the hole wall of the first through hole 311 are partially melted and fused together, and the fused parts are solidified to form the first welding portion W1.

[0112] Optionally, in the same plane perpendicular to the thickness direction X, the orthographic projection of the second terminal portion 32 and the orthographic projection of the first through hole 311 do not overlap. The second terminal portion 32 does not cover the first through hole 311 along the thickness direction X, which is conducive to welding the first adapter 40 and the first terminal portion 31. A portion of the first welding portion W1 formed by welding the first adapter 40 and the first terminal portion 31 may be exposed on the side of the second terminal portion 32 away from the wall portion 23 along the thickness direction X.

[0113] Exemplarily, the second terminal portion 32 may be provided with a through hole, a through groove or other structure that passes through the second terminal portion 32 along the thickness direction X, and a portion of the first welding portion W1 may be exposed on the side of the first electrode terminal 30 away from the electrode assembly 10 along the thickness direction X through the through hole, through groove or other structure of the second terminal portion 32.

[0114] In some examples, the second terminal portion 32 may surround a portion of the first terminal portion 31 , and the second terminal portion 32 may be an annular structure. In other examples, the second terminal portion 32 may also include a plurality of sub-portions spaced apart along the outer circumference of a portion of the first terminal portion 31 .

[0115] During assembly, the first pole tab 12 may be connected to the first adapter 40 and the first pole tab 12 may be bent; then the electrode assembly 10 and the first adapter 40 may be installed as a whole on the housing 21; then the wall portion 23 may be assembled to the housing 21, and finally the first adapter 40 and the first terminal portion 31 may be welded. Specifically, the portion of the first adapter 40 accommodated in the first through hole 311 and the first terminal portion 31 may be heated from the outside of the first terminal portion 31 facing away from the main body 11 by laser or other means, so that the first terminal portion 31 and the first adapter 40 are butt welded, which may reduce the possibility of welding particles generated during welding falling into the side of the first adapter 40 facing the electrode assembly 10, reduce the risk of internal short circuit of the battery cell 6, and help improve the reliability of the battery cell 6.

[0116] Furthermore, the first pole lug 12 and the first adapter 40 are first inserted into the shell, and then the first adapter 40 and the first terminal portion 31 are welded. On the one hand, the length of the first pole lug 12 led out from the main body 11 can be shortened, saving the space required for bending the first pole lug 12, which is beneficial to improving the energy density of the battery cell 6; on the other hand, the first pole lug 12 and the first adapter 40 are in a natural state, which can reduce external force pulling and reduce the risk of cracking of the first pole lug 12.

[0117] The second terminal portion 32 is arranged along the outer periphery of a portion of the first terminal portion 31. The second terminal portion 32 and the first terminal portion 31 can share part of the space in the thickness direction X, which can reduce the overall thickness of the first electrode terminal 30 in the thickness direction X, which is beneficial to reducing the space occupied by the battery cell 6 and improving the energy density.

[0118] In some embodiments, the battery cell 6 further includes an insulating support member, which is disposed on the main body 11 and is located between the main body 11 and the first adapter 40. The insulating support member can be used to support the first adapter 40 so that a portion of the first adapter 40 abuts against the first terminal portion 31, which is beneficial to improving the welding effect of the first adapter 40 and the first terminal portion 31.

[0119] Optionally, the insulating support member may be an insulating film, an insulating bracket or other components that can perform insulating and supporting functions.

[0120] In some embodiments, reference Figure 5 and Fig.11The first terminal portion 31 includes a first terminal body 312 and a first limiting portion 313. The first through hole 311 is provided in the first terminal body 312 and penetrates the first terminal body 312 along the thickness direction X. The first adapter 40 is welded to the first terminal body 312. The first limiting portion 313 is connected to the first terminal body 312 and protrudes from the outer peripheral surface of the first terminal body 312. The first limiting portion 313 is located on the side of the wall portion 23 facing away from the main body 11. The second terminal portion 32 is stacked with the first limiting portion 313 and connected to the side of the first limiting portion 313 facing away from the wall portion 23. Along the direction from the main body 11 to the wall portion 23, the first terminal body 312 exceeds the surface of the first limiting portion 313 facing away from the wall portion 23, and the second terminal portion 32 is located on the outer periphery of the portion of the first terminal body 312 that exceeds the first limiting portion 313.

[0121] The first terminal body 312 may be a hollow cylindrical structure, and the hollow portion inside the first terminal body 312 forms the first through hole 311. The first terminal body 312 has an outer peripheral surface surrounding its central axis, and the first limiting portion 313 is connected to and protrudes from the outer peripheral surface of the first terminal body 312.

[0122] Optionally, the first limiting portion 313 and the first terminal body 312 may be an integrally formed structure.

[0123] In some examples, reference Figure 5 , the first terminal body 312 can be inserted into the electrode lead-out hole 231, and one end of the first terminal body 312 away from the main body 11 along the thickness direction X can extend out of the electrode lead-out hole 231 along the thickness direction X to facilitate connection with the first limiting portion 313. Fig.11 The first terminal body 312 may also be disposed on a side of the electrode lead-out hole 231 away from the main body 11 along the thickness direction X.

[0124] The second terminal portion 32 is disposed on a side of the first limiting portion 313 away from the wall portion 23 and is stacked and connected with the first limiting portion 313 , which can increase the connection area between the first terminal portion 31 and the second terminal portion 32 and improve the connection stability between the two.

[0125] The surface of the second terminal portion 32 facing the wall portion 23 can be attached to and connected to the surface of the first limiting portion 313 facing away from the wall portion 23. Along the direction from the main body 11 to the wall portion 23, the first terminal body 312 can exceed the surface of the second terminal portion 32 facing the wall portion 23. The second terminal portion 32 is located at the periphery of the portion of the first terminal body 312 that exceeds the first limiting portion 313.

[0126] The second terminal portion 32 may be directly connected to the first terminal body 312 , or may not be connected to the first terminal body 312 .

[0127] Along the thickness direction X, the second terminal portion 32 is located as a whole on the side of the first limiting portion 313 away from the wall portion 23. In the thickness direction X, there is no thickness overlap between the second terminal portion 32 and the wall portion 23, which can increase the distance between the surface of the second terminal portion 32 facing away from the wall portion 23 and the wall portion 23. After the second terminal portion 32 is connected to the busbar component, the second terminal portion 32 can prop up the busbar component to a certain height along the thickness direction X to increase the distance between the busbar component and the wall portion 23, which is conducive to reducing the risk of overlapping of the busbar component and the wall portion 23.

[0128] In some embodiments, reference Figure 5 , Figure 6 and Fig.11 , the second terminal portion 32 is connected to the first terminal body 312 .

[0129] Optionally, the second terminal portion 32 may be disposed around the first terminal body 312 , and an inner circumferential surface of the second terminal portion 32 may be connected to an outer circumferential surface of the first terminal body 312 .

[0130] The outer peripheral surface of the first terminal body 312 may extend along the thickness direction X, or may be inclined relative to the thickness direction X.

[0131] Along the direction of the main body 11 pointing to the wall portion 23, a portion of the first terminal body 312 exceeds the surface of the first limiting portion 313 facing away from the wall portion 23, and the second terminal portion 32 can be arranged along the outer periphery of the portion of the first terminal body 312 exceeding the first limiting portion 313, and connected to the portion of the first terminal body 312 exceeding the first limiting portion 313.

[0132] The second terminal portion 32 is connected to the first limiting portion 313 and the first terminal body 312 at the same time. There are at least two connecting surfaces between the second terminal portion 32 and the first terminal portion 31, which is beneficial to increase the connection area and flow area between the two, enhance the connection strength and connection stability between the two, and improve the flow capacity.

[0133] In some embodiments, reference Figure 5 , Figure 6 and Fig.11 The second terminal portion 32 is provided with a second through hole 321, which penetrates the second terminal portion 32 along the thickness direction X of the wall portion 23, and a portion of the first terminal body 312 is accommodated in the second through hole 321 and connected to at least a portion of the hole wall 321c of the second through hole 321.

[0134] Along the direction from the main body 11 to the wall 23 , the portion of the first terminal body 312 that exceeds the first limiting portion 313 can be accommodated in the second through hole 321 and connected to at least a portion of the hole wall 321 c of the second through hole 321 .

[0135] Optionally, the orthographic projection of the second through hole 321 may be circular, rectangular or other shapes in the projection plane perpendicular to the thickness direction X. The outer contour of the portion of the first terminal body 312 accommodated in the second through hole 321 is adapted to the shape of the second through hole 321 to increase the connection area between the first terminal body 312 and the second terminal portion 32.

[0136] The second terminal portion 32 is an annular structure surrounding the second through hole 321. The portion of the first terminal body 312 accommodated in the second through hole 321 can be attached to and connected to the hole wall of the second through hole 321. Thus, the connection area and flow area between the first terminal body 312 and the second terminal portion 32 can be further increased, which is conducive to further enhancing the connection strength and connection stability between the two and improving the flow capacity.

[0137] In some embodiments, reference Figure 6 Along the thickness direction X, the second through hole 321 has a first end 321a close to the first limiting portion 313 and a second end 321b away from the first limiting portion 313. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first end 321a is located within the orthographic projection of the second end 321b, and the orthographic projection range of the second end 321b exceeds the orthographic projection range of the first end 321a.

[0138] In a projection plane perpendicular to the thickness direction X, an orthographic projection area of ​​the first end 321 a is smaller than an orthographic projection area of ​​the second end 321 b .

[0139] Optionally, along the direction from the second end 321b to the first end 321a, the cross-sectional area of ​​the second through hole 321 may be gradually reduced. Along the direction from the second end 321b to the first end 321a, the cross-sectional area of ​​the second through hole 321 may be gradually reduced in a balanced manner, or may be gradually reduced in a stepped and segmented manner. For example, the hole wall 321c of the second through hole 321 may be inclined relative to the thickness direction X, so that the cross-sectional area of ​​the second through hole 321 is gradually reduced in a balanced manner along the direction from the second end 321b to the first end 321a. For another example, the hole wall of the second through hole 321 may be provided with at least one step portion, each step portion having a step surface facing the first limiting portion 313, so that the cross-sectional area of ​​the second through hole 321 is gradually reduced in a segmented manner along the direction from the second end 321b to the first end 321a.

[0140] Since a portion of the first terminal body 312 is accommodated in the second through hole 321 and connected to the hole wall 321c of the second through hole 321, the shape of the outer circumference of the portion of the first terminal body 312 accommodated in the second through hole 321 can be adapted to the shape of the hole wall 321c of the second through hole 321. Along the direction from the second end 321b to the first end 321a, the circumferential length of the outer circumference of the portion of the first terminal body 312 accommodated in the second through hole 321 tends to be gradually reduced.

[0141] In the thickness direction X, a portion of the first terminal body 312 may be located on the side of a portion of the second terminal portion 32 that is away from the wall portion 23. This portion of the first terminal body 312 may have a limiting effect on this portion of the second terminal portion 32, so that the second terminal portion 32 presses the first limiting portion 313 along the thickness direction X, which is beneficial to improving the connection strength and connection stability between the first terminal portion 31 and the second terminal portion 32.

[0142] In some embodiments, the cross section of the second through hole 321 perpendicular to the thickness direction X is circular, and along the direction of the wall portion 23 pointing toward the main body 11 , the hole wall 321 c of the second through hole 321 is inclined inwardly along the radial direction of the second through hole 321 .

[0143] The hole wall 321 c of the second through hole 321 may be inclined relative to the thickness direction X, and the cross-sectional area of ​​the second through hole 321 gradually decreases in a balanced manner along the direction from the second end 321 b to the first end 321 a .

[0144] During assembly, pressure can be applied to the end of the first terminal body 312 away from the main body 11 by riveting or other means, so that the end of the first terminal body 312 expands radially outward along the second through hole 321 and abuts against the hole wall 321c of the second through hole 321, thereby making the mating interface between the second terminal portion 32 and the first terminal body 312 inclined relative to the thickness direction X.

[0145] The hole wall 321c of the second through hole 321 is inclined inwardly along the radial direction of the second through hole 321. The first terminal body 312 can not only generate a force on the second terminal part 32 toward the first limiting part 313 along the thickness direction X, which is beneficial for the second terminal part 32 to press the first limiting part 313 along the thickness direction X, but also the first terminal body 312 can also generate a radial outward force on the second terminal part 32 along the second through hole 321, which is beneficial for the first terminal body 312 to press the second terminal part 32 along the radial direction of the second through hole 321, thereby improving the overall connection strength and connection stability of the first terminal part 31 and the second terminal part 32.

[0146] In some embodiments, reference Figure 5 and Fig.11 The portion of the first adapter 40 received in the first through hole 311 has a first surface 42a facing away from the main body 11, and the first terminal body 312 has a second surface 312a facing away from the main body 11. The portion of the first adapter 40 received in the first through hole 311 is welded with the first terminal portion 31 to form a first welding portion W1, and the first welding portion W1 connects the first surface 42a and the second surface 312a.

[0147] A portion of the first welding portion W1 is directly connected to the outer peripheral wall of the portion of the first adapter 40 accommodated in the first through hole 311, and the hole wall of the first through hole 311, and another portion of the first welding portion W1 is directly connected to the first surface 42a and the second surface 312a, which is beneficial to improving the welding strength between the first adapter 40 and the first terminal body 312.

[0148] The first welding portion W1 connects the first surface 42a and the second surface 312a. Along the thickness direction X, the first surface 42a and the second surface 312a can be flush with each other, which is beneficial to reduce the difficulty of butt welding between the first adapter 40 and the first terminal body 312 and improve the welding effect.

[0149] In some embodiments, at least a portion of the first terminal body 312 is accommodated in the electrode lead-out hole 231. The first electrode terminal 30 further includes a second stopper 314, which protrudes from the outer peripheral surface of the first terminal body 312, and a portion of the wall portion 23 is located between the first stopper 313 and the second stopper 314 along the thickness direction X of the wall portion 23.

[0150] The first terminal body 312 may be entirely accommodated in the electrode lead-out hole 231 , or only a portion of the first terminal body 312 may be accommodated in the electrode lead-out hole 231 , and both ends of the first terminal body 312 along the thickness direction X may extend to the outside of the electrode lead-out hole 231 .

[0151] The second limiting portion 314 may be connected to an end of the first terminal body 312 along the thickness direction X close to the main body 11 .

[0152] Optionally, the first terminal body 312, the first limiting portion 313 and the second limiting portion 314 are an integrally formed structure. At least one of the first limiting portion 313 and the second limiting portion 314 can be formed by riveting.

[0153] Along the thickness direction X, a portion of the wall portion 23 is located between the first limiting portion 313 and the second limiting portion 314, and at least a portion of the first limiting portion 313 and at least a portion of the second limiting portion 314 are respectively arranged on both sides of the wall portion 23 along the thickness direction X. The first terminal portion 31 can be limited in the thickness direction X, reducing the risk of the first terminal portion 31 falling into the inside or outside of the housing 20.

[0154] In some embodiments, along the thickness direction X, a portion of the first electrode tab 12 is located between the second limiting portion 314 and the first transition component 40 .

[0155] At least a portion of the second limiting portion 314 is located on the side of the wall portion 23 facing the main body portion 11, and the gap between the second limiting portion 314 and the first adapter 40 is relatively small. In the embodiment of the present application, a portion of the first pole ear 12 is disposed between the second limiting portion 314 and the first adapter 40, and a portion of the first pole ear 12 is more likely to contact the second limiting portion 314, thereby forming a current path between the first pole ear 12 and the second limiting portion 314.

[0156] In some embodiments, reference Figures 7 to 10 The portion of the first electrode tab 12 located between the second limiting portion 314 and the first adapter 40 is connected to the second limiting portion 314 .

[0157] The portion of the first pole lug 12 located between the second limiting portion 314 and the first adapter 40 can contact the second limiting portion 314, thereby being electrically connected to the second limiting portion 314. A current flow path can be formed between the first pole lug 12 and the first terminal portion 31, and part of the current can be directly transmitted between the first pole lug 12 and the first terminal portion 31, which is beneficial to improving the current flow capacity of the battery cell 6.

[0158] In some embodiments, reference Figures 7 to 10 The first pole tab 12 includes a folded section 121, a bent section 122 and an extended section 123. The folded section 121 is located on the side of the first adapter 40 facing the main body 11 and connected to the main body 11. The bent section 122 is located on the side of the first adapter 40 along the width direction Y of the wall 23. The bent section 122 is connected between the folded section 121 and the extended section 123. The extended section 123 extends from the bent section 122 to between the second limit portion 314 and the first adapter 40. The extended section 123 is welded to the first adapter 40 and attached to the surface of the second limit portion 314 facing the main body 11.

[0159] The gathered section 121 is a portion of the first electrode tab 12 used for direct connection with the main body 11. The gathered section 121 may extend from one end of the main body 11 facing the wall 23 to one side of the first adapter 40 along the width direction Y of the wall 23.

[0160] The bending section 122 is bent relative to the gathering section 121 and the extending section 123. Optionally, the bending section 122 may be bent into an arc shape.

[0161] Along the thickness direction X, at least a portion of the extension section 123 may be sandwiched between the first adapter 40 and the second limiting portion 314 .

[0162] Optionally, the number of electrode assemblies 10 may be two, and the two electrode assemblies 10 are stacked along the width direction Y of the wall portion 23. The first pole tabs 12 of the two electrode assemblies 10 are both connected to the first adapter 40. The bending sections 122 of the first pole tabs 12 of the two electrode assemblies 10 are respectively located on opposite sides of the first adapter 40 along the width direction Y, and the extension sections 123 of the first pole tabs 12 of the two electrode assemblies 10 extend toward each other along the width direction Y.

[0163] The extension section 123 can be welded to the first adapter 40 by laser welding or other suitable methods.

[0164] The extension section 123 is attached to the surface of the second limiting portion 314 facing the main body 11 , which can increase the contact area between the extension section 123 and the second limiting portion 314 , and further improve the flow capacity.

[0165] The folded section 121 and the extended section 123 of the first pole tab 12 are respectively located on both sides of the first adapter 40 along the thickness direction X, and the bent section 122 connected between the folded section 121 and the extended section 123 is located on one side of the first adapter 40 along the width direction Y. The bent section 122 and the first adapter 40 can share at least part of the space in the thickness direction X, which is beneficial to improve space utilization. In addition, the first pole tab 12 only needs to be bent once, and there is no need to reserve a large bending space for the first pole tab 12 between the first adapter 40 and the main body 11, which is beneficial to improve the space utilization in the housing 20 and improve the energy density of the battery cell 6.

[0166] In some embodiments, reference Fig.11 and Fig.12 The battery cell 6 includes a fixing member 51 . The fixing member 51 is at least partially disposed on a side of the first limiting portion 313 away from the wall portion 23 . The fixing member 51 is connected to the wall portion 23 .

[0167] The fixing member 51 may be an annular structure. For example, the fixing member 51 is a rotating body.

[0168] In some examples, a portion of the fixing member 51 may directly abut against the first electrode terminal 30 along the thickness direction X. The wall portion 23 may be electrically connected to the first electrode terminal 30 through the fixing member 51, so that the wall portion 23 is charged. In other examples, an insulating member may also be provided between a portion of the fixing member 51 and the first electrode terminal 30 along the thickness direction X, and a portion of the fixing member 51 may be indirectly pressed and fitted with the first electrode terminal 30 through the insulating member, and the fixing member 51 may be insulated and isolated from the first electrode terminal 30 through the insulating member.

[0169] In some examples, along the thickness direction X, a portion of the fixing member 51 may be disposed on a side of the first terminal portion 31 away from the wall portion 23 and surround the second terminal portion 32, and the fixing member 51 may press the first terminal portion 31 toward the wall portion 23. In other examples, along the thickness direction X, a portion of the fixing member 51 may be disposed on a side of the second terminal portion 32 at least partially away from the wall portion 23, and the fixing member 51 may press the second terminal portion 32 and the first terminal portion 31 toward the wall portion 23.

[0170] Optionally, the fixing member 51 may be made of metal to improve the connection strength and stability between the fixing member 51 and the wall portion 23 .

[0171] The fixing member 51 and the wall portion 23 can be connected and relatively fixed by welding or other suitable means.

[0172] The first electrode terminal 30 is disposed on the side of the wall portion 23 away from the electrode assembly 10, and does not occupy the internal space of the housing 20, so that the size of the electrode assembly 10 can be increased within a limited space, thereby increasing the capacity of the battery cell 6. In addition, a portion of the fixing member 51 is disposed on the side of the first electrode terminal 30 away from the wall portion 23, and the fixing member 51 can apply a force toward the wall portion 23 to the first electrode terminal 30, which is conducive to pressing the first electrode terminal 30 against the wall portion 23, realizing the assembly of the first electrode terminal 30 and the wall portion 23, and can also improve the sealing performance of the battery cell 6.

[0173] In some embodiments, reference Fig.12 The fixing member 51 includes a first fixing portion 511 and a second fixing portion 512 connected to each other, the first fixing portion 511 is at least partially disposed on a side of the first limiting portion 313 away from the wall portion 23, and the second fixing portion 512 is fixed to the wall portion 23. Along the thickness direction of the wall portion 23, a portion of the first limiting portion 313 and / or a portion of the second terminal portion 32 is located between the first fixing portion 511 and the wall portion 23.

[0174] The first fixing portion 511 may be disposed around at least a portion of the second terminal portion 32. The second fixing portion 512 may be bent or curved from the first fixing portion 511 toward the wall portion 23. The second fixing portion 512 may be disposed along the outer periphery of the first electrode terminal 30, and a portion of the second fixing portion 512 may be attached to a surface of the wall portion 23 that is away from the main body portion 11, so as to increase the connection area between the second fixing portion 512 and the wall portion 23, and improve the connection strength and stability.

[0175] In some examples, only a portion of the first terminal portion 31 is located between the first fixing portion 511 and the wall portion 23 , and at least a portion of the first fixing portion 511 is located on a side of the first terminal portion 31 away from the wall portion 23 .

[0176] In some other examples, only a portion of the second terminal portion 32 is located between the first fixing portion 511 and the wall portion 23 , and at least a portion of the first fixing portion 511 is located on a side of the second terminal portion 32 away from the wall portion 23 .

[0177] In some other examples, a portion of the first terminal portion 31 and a portion of the second terminal portion 32 are both located between the first fixing portion 511 and the wall portion 23 , and at least a portion of the first fixing portion 511 is located on a side of the second terminal portion 32 and the first terminal portion 31 away from the wall portion 23 .

[0178] Optionally, refer to Fig.12 The second terminal portion 32 has a second terminal body 322 and a step portion 323, and the step portion 323 protrudes from the outer peripheral surface of the second terminal body 322. Along the thickness direction X, at least part of the step portion 323 is located between the first terminal portion 31 and the first fixing portion 511. The step portion 323 has a step surface 323a facing away from the first terminal portion 31 along the thickness direction X. The first fixing portion 511 can directly abut against the step surface 323a, or can be indirectly pressed and matched with the step surface 323a through other structures (such as an insulating member).

[0179] The first fixing portion 511 can apply a force toward the wall portion 23 to the first terminal portion 31 and / or the second terminal portion 32, thereby directly pressing the first terminal portion 31 against the wall portion 23, or indirectly pressing the first terminal portion 31 against the wall portion 23 through the second terminal portion 32. When a portion of the second terminal portion 32 is located between the first fixing portion 511 and the wall portion 23, or when a portion of the first terminal portion 31 and a portion of the second terminal portion 32 are both located between the first fixing portion 511 and the wall portion 23, the first fixing portion 511 can also cause the second terminal portion 32 to be pressed against the first terminal portion 31, which is beneficial to improving the connection strength and connection stability between the first terminal portion 31 and the second terminal portion 32.

[0180] In some embodiments, reference Fig.11 and Fig.12 The battery cell 6 further includes an insulating member 52, which at least partially surrounds the first electrode terminal 30 and is fixed relative to the first electrode terminal 30. The first fixing portion 511 can be embedded in the insulating member 52. The second fixing portion 512 can be entirely disposed on the outer periphery of the insulating member 52, a portion of the second fixing portion 512 can also be embedded in the insulating member 52, and another portion of the second fixing portion 512 is connected to the wall portion 23.

[0181] The insulating member 52 may be made of a high temperature resistant insulating material. Optionally, the insulating member 52 may be a plastic member. The insulating member 52 may be disposed on the outer periphery of the first electrode terminal 30 by integral injection molding.

[0182] The insulating member 52 can cover the first fixing portion 511 and a portion of the second fixing portion 512. On the one hand, it is beneficial to enhance the installation stability of the fixing member 51. On the other hand, it can also reduce the possibility of overlapping between the first fixing portion 511 and the first electrode terminal 30 or the busbar component, reduce the possibility of overlapping between the second fixing portion 512 and the first electrode terminal 30, and reduce the risk of short circuit.

[0183] In some embodiments, reference Figure 5 and Fig.11 The first adapter 40 includes a first adapter body 41 and a first protrusion 42. The first adapter body 41 is arranged on the side of the wall portion 23 facing the main body portion 11 and is connected to the first pole ear 12. The first protrusion 42 protrudes from the surface of the first adapter body 41 facing the wall portion 23. At least a portion of the first protrusion 42 is accommodated in the first through hole 311 and welded to the first terminal portion 31.

[0184] The portion of the first convex portion 42 accommodated in the first through hole 311 is welded with the first terminal portion 31 to form a first welding portion W1, and the first welding portion W1 is directly connected to the outer peripheral surface of the first convex portion 42 and the hole wall of the first through hole 311. Optionally, the first welding portion W1 can also be directly connected to the surface of the first convex portion 42 facing away from the main body portion 11 and the second surface 312a, and the surface of the first convex portion 42 facing away from the main body portion 11 forms the first surface 42a.

[0185] The first adapter body 41 can be connected to the first electrode tab 12 by welding or other suitable methods.

[0186] In the embodiment of the present application, the first adapter body 41 is disposed on the side of the wall portion 23 facing the main body portion 11, which is conducive to shortening the length of the first pole tab 12 led out from the main body portion 11, and is convenient for connecting the first adapter body 41 and the first pole tab 12. The first protrusion 42 protrudes from the first adapter body 41, which can enhance the overall structural strength of the first adapter 40 and reduce the risk of deformation thereof during welding.

[0187] In some embodiments, the first protrusion 42 is a solid structure.

[0188] The surface of the first adapter body 41 facing the main body portion 11 may be a continuous surface.

[0189] The first convex portion 42 is not provided with a recessed portion, a through hole or other structures, which can increase the flow area of ​​the first convex portion 42 and enhance the deformation resistance of the first convex portion 42 itself, thereby facilitating the improvement of the flow capacity and overall strength of the first adapter 40 .

[0190] In some embodiments, reference Figures 7 to 10 Along the thickness direction X of the wall portion 23 , a portion of the first electrode tab 12 is located between the first terminal portion 31 and the first adapter body 41 , and is connected to the first adapter body 41 .

[0191] Optionally, a portion of the first electrode tab 12 may be located between the second limiting portion 314 and the first transition body 41 .

[0192] A portion of the first pole tab 12 is connected to the side of the first adapter body 41 facing the wall portion 23. Thus, a portion of the first pole tab 12 can be accommodated in the gap between the first adapter body 41 and the first terminal portion 31, which is beneficial to saving the folded pole tab space between the first adapter body 41 and the main body 11. In addition, the possibility of the first pole tab 12 contacting the first terminal portion 31 to directly form a current path between the first pole tab 12 and the first terminal portion 31 can also be increased.

[0193] In some embodiments, reference Figure 5 and Fig.11 The second terminal portion 32 has a third surface 32 a away from the main body portion 11 along the thickness direction X. In the direction from the main body portion 11 to the wall portion 23 , the first terminal portion 31 and the first adapter 40 do not extend beyond the third surface 32 a .

[0194] Along the thickness direction X, the third surface 32 a may be flush with the second surface 312 a of the first terminal body 312 facing away from the main body 11 , or the third surface 32 a may extend beyond the second surface 312 a along the direction from the main body 11 to the wall 23 .

[0195] Along the thickness direction X, the first surface 42a of the first adapter 40 received in the first through hole 311 facing away from the main body 11 can be flush with the third surface 32a, and the third surface 32a can also extend beyond the first surface 42a along the direction from the main body 11 to the wall 23.

[0196] The first terminal portion 31 and the first adapter 40 do not extend beyond the third surface 32a. When the second terminal portion 32 is connected to the busbar component, the first terminal portion 31 and the first adapter 40 are not likely to interfere with the busbar component, which is beneficial to reducing the gap between the second terminal portion 32 and the busbar component and improving the connection effect between the two.

[0197] In some embodiments, reference Figure 5 and Fig.11 The first adapter 40 is welded to the first terminal portion 31 to form a first welding portion W1. The second terminal portion 32 has a third surface 32a away from the main body portion 11 along the thickness direction X. The first welding portion W1 does not exceed the third surface 32a along the direction from the main body portion 11 to the wall portion 23.

[0198] In some examples, the first welding portion W1 may be directly connected only to the outer peripheral surface of the portion of the first adapter 40 accommodated in the first through hole 311 and the hole wall of the first through hole 311, and the first welding portion W1 does not exceed the first surface 42a of the first adapter 40 and the second surface 312a of the first terminal body 312 along the direction from the main body 11 to the wall 23. Optionally, along the thickness direction X, the first surface 42a and the second surface 312a may be both flush with the third surface 32a.

[0199] In other examples, the first welding portion W1 is not only directly connected to the outer circumference of the portion of the first adapter 40 accommodated in the first through hole 311 and the hole wall of the first through hole 311, but also directly connected to the first surface 42a and the second surface 312a. Along the direction from the main body 11 to the wall 23, the first welding portion W1 may extend beyond the first surface 42a and the second surface 312a, and the third surface 32a may extend beyond the first surface 42a and the second surface 312a.

[0200] The first welding portion W1 does not extend beyond the third surface 32a. When the second terminal portion 32 is connected to the busbar component, the first welding portion W1 is not likely to interfere with the busbar component, which is beneficial to reducing the gap between the second terminal portion 32 and the busbar component and improving the connection effect between the two.

[0201] In some embodiments, reference Figure 3 , Fig.13 and Fig.14 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 6 also includes a second electrode terminal 60 and a second adapter 70, and the second adapter 70 connects the second pole tab 13 and the second electrode terminal 60. The base metal of the second electrode terminal 60 is the same as the base metal of the second terminal portion 32.

[0202] 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.

[0203] 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 60 and the second terminal portion 32 may be made of aluminum or aluminum alloy. The base metal of the second electrode terminal 60 and the base metal of the second terminal portion 32 may both be aluminum.

[0204] The second electrode terminal 60 is used to connect to the busbar component. The base metal of the second electrode terminal 60 is the same as the base metal of the second terminal portion 32. The second terminal portion 32 of one battery cell 6 and the second electrode terminal 60 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.

[0205] In some embodiments, reference Figure 3 , Fig.13 and Fig.14 The battery cell 6 includes a busbar component 80, at least part of which is located on a side of the second electrode terminal 60 away from the main body 11. The busbar component 80, the second adapter 70 and the second electrode terminal 60 are welded, and the base metal of the busbar component 80, the base metal of the second adapter 70 and the base metal of the second electrode terminal 60 are the same.

[0206] The busbar component 80, the second adapter 70 and the second electrode terminal 60 are welded to form a second welding portion W2. At least a portion of the second welding portion W2 is exposed on the side of the busbar component 80 that faces away from the second electrode terminal 60. Thus, the busbar component 80, the second adapter 70 and the second electrode terminal 60 can be welded from the side of the busbar component 80 that faces away from the wall portion 23, which is conducive to reducing the possibility of welding particles falling into the interior of the housing 20 and reducing the risk of short circuit.

[0207] The busbar component 80 , the second adapter 70 , and the second electrode terminal 60 may be welded together by penetration welding, butt welding, or other suitable methods.

[0208] In some examples, reference Fig.14 Along the thickness direction X, at least a portion of the busbar component 80, at least a portion of the second electrode terminal 60, and at least a portion of the second adapter 70 are sequentially abutted and welded together by penetration welding.

[0209] In other examples, refer to Fig.13 The current collecting component 80 and the second electrode terminal 60 respectively have a second through hole and a third through hole, and at least a portion of the second adapter 70 is accommodated in the second through hole and the third through hole and welded to the hole wall of the second through hole and the hole wall of the third through hole. In other words, a portion of the second welding portion W2 connects the second adapter 70 and the hole wall of the second through hole, and another portion of the second welding portion W2 connects the second adapter 70 and the hole wall of the third through hole.

[0210] Alternatively, the base metal of the busbar member 80 , the base metal of the second adapter 70 , and the base metal of the second electrode terminal 60 may all be aluminum.

[0211] In the embodiment of the present application, the busbar component 80 is pre-connected to the first electrode terminal 30 and the second adapter 70 . After the battery cells 6 are stacked, the busbar component 80 can be received and positioned, which is beneficial to simplifying the assembly process.

[0212] In the embodiment of the present application, the base metal of the current collecting component 80, the base metal of the second adapter 70 and the base metal of the second electrode terminal 60 are set to be the same, so that the current collecting component 80, the second adapter 70 and the second electrode terminal 60 can be welded together through a single welding process, which is conducive to simplifying the welding operation and improving the welding efficiency. In addition, the current collecting component 80 can be directly electrically connected to the second adapter 70 through the second welding portion W2, which is conducive to improving the current carrying capacity.

[0213] In some embodiments, the base metal of the first terminal portion 31 and the base metal of the first transition member 40 are both copper. The base metal of the second terminal portion 32 is aluminum.

[0214] The first pole tab 12 is a negative pole tab, and the negative pole tab is made of copper. In the embodiment of the present application, the base metal of the first adapter 40 is set to copper, which is convenient for welding between the first adapter 40 and the first pole tab 12. In the embodiment of the present application, the base metal of the first terminal portion 31 is set to copper, which is convenient for welding between the first terminal portion 31 and the first adapter 40.

[0215] The second terminal portion 32 is used to connect to the busbar component, which is used to connect to the positive electrode of another battery cell 6. The positive electrode is usually made of aluminum. In the embodiment of the present application, the base metal of the second terminal portion 32 is set to aluminum, which is convenient for welding between the second terminal portion 32 and the busbar component, and also convenient for welding between the busbar component and the positive electrode of another battery cell 6.

[0216] In some embodiments, the first terminal portion 31 and the second terminal portion 32 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 terminal portion 31 and the second terminal portion 32 and reduce the risk of the connection surfaces of the first terminal portion 31 and the second terminal portion 32 being separated from each other.

[0217] 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.

[0218] The end cover 22 may be connected to the housing 21 by welding, clamping, bonding or other suitable methods.

[0219] 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 terminal part 31 are welded, which is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0220] According to the second aspect of the present application, the embodiment of the present application further provides a battery device 2, Fig.15 is a partial structural schematic diagram of a battery device provided in some embodiments of the present application, referring to Figure 2 and Fig.15 The battery device 2 includes a busbar component 80 and a battery cell 6 provided according to some embodiments of the first aspect of the present application. The battery cell 6 does not include the busbar component 80. The base metal of the busbar component 80 is the same as the base metal of the second terminal portion 32, and the busbar component 80 is welded to the second terminal portion 32.

[0221] Optionally, the first pole ear 12 is a negative pole ear, and the negative pole ear is made of copper. The first terminal portion 31 and the first adapter 40 can be made of copper or copper alloy, and the base metal of the first terminal portion 31 and the first adapter 40 is copper, which is convenient for welding. The second terminal portion 32 and the busbar component 80 can be made of aluminum or aluminum alloy, and the base metal of the second terminal portion 32 and the busbar component 80 is aluminum.

[0222] In the embodiment of the present application, the base metal of the busbar component 80 and the base metal of the second terminal portion 32 are set to be the same, which is beneficial to simplify the welding operation of the busbar component 80 and the second terminal portion 32 and improve the welding efficiency and welding effect.

[0223] In some embodiments, 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 6 also includes a second electrode terminal 60, which is electrically connected to the second pole tab 13, and the base metal of the second electrode terminal 60, the base metal of the second terminal portion 32, and the metal base of the busbar 80 are the same. There are multiple battery cells 6, and the busbar 80 is welded to at least the second terminal portion 32 of one battery cell 6 and the second electrode terminal 60 of another battery cell 6.

[0224] The second electrode terminal 60 is connected to the busbar component 80. The base metal of the second electrode terminal 60, the base metal of the second terminal portion 32 and the metal base of the busbar component 80 are the same. The second terminal portion 32 of one battery cell 6 and the second electrode terminal 60 of another battery cell 6 can be welded to the same busbar component 80, which is conducive to realizing the series connection between the two battery cells 6 and reducing the difficulty of connection.

[0225] According to the second aspect of the present application, the present application embodiment further provides a battery device 2, referring to Figure 2 and Fig.15 The battery device 2 includes a battery cell 6 provided according to some embodiments of the first aspect of the present application. The battery cell 6 includes an electrode assembly 10, a housing 20, a first electrode terminal 30, a first adapter 40, a second electrode terminal 60, a second adapter 70 and a busbar component 80. The electrode assembly 10 includes a main body 11, and a first pole tab 12 and a second pole tab 13 led out from the main body 11. The first electrode terminal 30 and the second electrode terminal 60 are arranged on the wall portion 23. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 connected to each other, and the base metal of the first terminal portion 31 and the base metal of the second terminal portion 32 are different. In the thickness direction X of the wall portion 23, the second terminal portion 32 is arranged on the side of the wall portion 23 facing away from the main body 11 and is used to connect with the busbar component. The first adapter 40 connects the first pole tab 12 and the first terminal portion 31, and the base metal of the first adapter 40 is the same as the base metal of the first terminal portion 31. In the thickness direction X of the wall portion 23, the first adapter 40 is at least partially accommodated in the first through hole 311 and welded to the first terminal portion 31. The second adapter 70 connects the second pole tab 13 and the second electrode terminal 60. The base metal of the second electrode terminal 60 is the same as the base metal of the second terminal portion 32. At least part of the busbar 80 is located on the side of the second electrode terminal 60 away from the main body 11. The busbar 80, the second adapter 70 and the second electrode terminal 60 are welded, and the base metal of the busbar 80, the base metal of the second adapter 70 and the base metal of the second electrode terminal 60 are the same.

[0226] In some embodiments, the battery device 2 includes a plurality of battery cells 6, and at least some of the battery cells 6 include an electrode assembly 10, a housing 20, a first electrode terminal 30, a first adapter 40, a second electrode terminal 60, a second adapter 70, and a busbar 80. The first adapter 40 connects the first pole tab 12 and the first terminal portion 31. The second adapter 70 connects the second pole tab 13 and the second electrode terminal 60. The busbar 80, the second adapter 70, and the second electrode terminal 60 are welded.

[0227] 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.

[0228] 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 second electrode terminal 60, a second adapter 70 and a current collecting component 80. The shell 20 includes a shell 21 and an end cap 22. 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 and a second pole ear 13 led out from the main body 11. The first electrode terminal 30 and the second electrode terminal 60 are arranged on the end cap 22. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 connected to each other, and the base metal of the first terminal portion 31 and the base metal of the second terminal portion 32 are different. The first terminal portion 31 is provided with a first through hole 311, and the first through hole 311 penetrates the first terminal portion 31 along the thickness direction X of the end cap 22. The second terminal portion 32 is arranged on the side of the end cap 22 facing away from the main body 11 and is used to connect with the current collecting component. The first adapter 40 is connected to the first pole tab 12, the base metal of the first adapter 40 is the same as the base metal of the first terminal portion 31, and at least a portion of the first adapter 40 is accommodated in the first through hole 311 and welded to the first terminal portion 31. The second electrode terminal 60, the second adapter 70 and the busbar component 80 are welded by external laser penetration and form a second welding portion W2, and a portion of the second welding portion W2 is exposed on the side of the busbar component 80 facing away from the end cover 22. Along the thickness direction X of the end cover 22, a portion of the first pole tab 12 is located between the first terminal portion 31 and the first adapter 40, and is connected to the first adapter 40 and the first terminal portion 31.

[0229] 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 electrode terminal, comprising a first terminal portion and a second terminal portion connected to each other, the base metal of the first terminal portion and the base metal of the second terminal portion are different, the first terminal portion is at least partially disposed in the electrode lead-out hole, the first terminal portion is provided with a first through hole, the first through hole penetrates the first terminal portion along the thickness direction of the wall portion, the second terminal portion is disposed on a side of the wall portion facing away from the main body portion and is used to connect to the current collecting component, the second terminal portion is disposed along the outer periphery of a portion of the first terminal portion, and is stacked with another portion of the first terminal portion along the thickness direction; as well as The first adapter is connected to the first tab, the base metal of the first adapter is the same as the base metal of the first terminal portion, and at least a portion of the first adapter is accommodated in the first through hole and welded to the first terminal portion.

2. The battery cell according to claim 1, characterized in that: The first terminal portion includes a first terminal body and a first limiting portion, the first through hole is provided in the first terminal body and penetrates the first terminal body along the thickness direction, the first adapter is welded to the first terminal body, the first limiting portion is connected to the first terminal body and protrudes from the outer peripheral surface of the first terminal body, and the first limiting portion is located on a side of the wall portion facing away from the main body; The second terminal portion is stacked with the first limiting portion and connected to a side of the first limiting portion away from the wall portion; Along the direction from the main body to the wall, the first terminal body exceeds the surface of the first limiting portion facing away from the wall, and the second terminal portion is located at the periphery of the portion of the first terminal body exceeding the first limiting portion.

3. The battery cell according to claim 2, characterized in that: The second terminal portion is connected to the first terminal body.

4. The battery cell according to claim 3, characterized in that: The second terminal portion is provided with a second through hole, which penetrates the second terminal portion along the thickness direction of the wall portion, and a portion of the first terminal body is accommodated in the second through hole and connected to at least a portion of the hole wall of the second through hole.

5. The battery cell according to claim 4, characterized in that: Along the thickness direction, the second through hole has a first end close to the first limiting portion and a second end away from the first limiting portion. In the same plane perpendicular to the thickness direction, the orthographic projection of the first end is located within the orthographic projection of the second end, and the orthographic projection range of the second end exceeds the orthographic projection range of the first end.

6. The battery cell according to claim 5, characterized in that: The cross section of the second through hole perpendicular to the thickness direction is circular, and along the direction from the wall portion to the main body portion, the hole wall of the second through hole is inclined inwardly along the radial direction of the second through hole.

7. The battery cell according to any one of claims 2 to 6, characterized in that: The portion of the first adapter accommodated in the first through hole has a first surface facing away from the main body, and the first terminal body has a second surface facing away from the main body; The portion of the first adapter accommodated in the first through hole is welded to the first terminal portion to form a first welding portion, and the first welding portion connects the first surface and the second surface.

8. The battery cell according to any one of claims 2 to 6, characterized in that: At least a portion of the first terminal body is accommodated in the electrode lead-out hole; The first electrode terminal further includes a second limiting portion, which protrudes from the outer peripheral surface of the first terminal body, and a portion of the wall portion is located between the first limiting portion and the second limiting portion along the thickness direction of the wall portion.

9. The battery cell according to claim 8, 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.

10. The battery cell according to claim 9, characterized in that: A portion of the first electrode tab located between the second limiting portion and the first adapter is connected to the second limiting portion.

11. The battery cell according to claim 10, characterized in that: The first pole ear comprises a folded section, a bent section and an extended section, the folded section is located on a side of the first adapter facing the main body and connected to the main body, the bent section is located on a side of the first adapter along the width direction of the wall, the bent section is connected between the folded section and the extended section, and the extended section extends from the bent section to between the second limiting portion and the first adapter; The extension section is welded to the first adapter and is attached to a surface of the second limiting portion facing the main body.

12. The battery cell according to any one of claims 2 to 6, characterized in that: The battery cell includes a fixing member, which is at least partially disposed on a side of the first limiting portion away from the wall portion, and is connected to the wall portion.

13. The battery cell according to claim 12, characterized in that: The fixing member comprises a first fixing portion and a second fixing portion connected to each other, the first fixing portion is at least partially disposed on a side of the first limiting portion away from the wall portion, and the second fixing portion is fixed to the wall portion; Along the thickness direction of the wall portion, a portion of the first limiting portion and / or a portion of the second terminal portion is located between the first fixing portion and the wall portion.

14. The battery cell according to any one of claims 1 to 6, characterized in that: The first adapter includes a first adapter body and a first protrusion. The first adapter body is arranged on the side of the wall portion facing the main body and is connected to the first pole ear. The first protrusion protrudes from the surface of the first adapter body facing the wall portion. At least a portion of the first protrusion is accommodated in the first through hole and welded to the first terminal portion.

15. The battery cell according to claim 14, characterized in that: The first convex portion is a solid structure.

16. The battery cell according to claim 14, characterized in that: Along the thickness direction of the wall portion, a portion of the first electrode tab is located between the first terminal portion and the first transfer body, and is connected to the first transfer body.

17. The battery cell according to any one of claims 1 to 6, characterized in that: The second terminal portion has a third surface away from the main body portion along the thickness direction, and along the direction from the main body portion to the wall portion, the first terminal portion and the first adapter do not extend beyond the third surface.

18. The battery cell according to any one of claims 1 to 6, characterized in that: The first adapter and the first terminal portion are welded to form a first welding portion; The second terminal portion has a third surface away from the main body portion along the thickness direction, and the first welding portion does not extend beyond the third surface along a direction from the main body portion to the wall portion.

19. The battery cell according to any one of claims 1 to 6, 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 adapter connects the second electrode tab and the second electrode terminal; A base metal of the second electrode terminal is the same as a base metal of the second terminal portion.

20. The battery cell according to claim 19, characterized in that: The battery cell includes a busbar component, at least a portion of which is located on a side of the second electrode terminal away from the main body; The busbar component, the second adapter, and the second electrode terminal are welded, and the base metal of the busbar component, the base metal of the second adapter, and the base metal of the second electrode terminal are the same.

21. The battery cell according to any one of claims 1 to 6, characterized in that: The base metal of the first terminal portion and the base metal of the first adapter are both copper; The base metal of the second terminal portion is aluminum.

22. The battery cell according to any one of claims 1 to 6, characterized in that: The first terminal portion and the second terminal portion are connected by at least one of cold rolling, hot rolling, explosive compounding, and explosive rolling.

23. The battery cell according to any one of claims 1 to 6, 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.

24. A battery device, characterized in that: include: A battery cell according to any one of claims 1-19, 21-23; as well as A busbar component, the base metal of the busbar component is the same as the base metal of the second terminal portion, and the busbar component is welded to the second terminal portion.

25. The battery device according to claim 24, 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, the second electrode terminal is electrically connected to the second electrode tab, and the base metal of the second electrode terminal, the base metal of the second terminal portion and the metal base of the busbar component are the same; There are multiple battery cells; The busbar member is welded to at least the second terminal portion of one of the battery cells and the second electrode terminal of another of the battery cells.

26. A battery device, characterized in that: Comprising the battery cell according to claim 20.

27. An electrical equipment, characterized in that: Comprising a battery device according to any one of claims 24-26, the battery device is used to provide electrical energy.

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