Battery monomer, battery device and electric equipment

Abstract

The invention discloses a battery monomer, a battery device and electric equipment. The battery monomer comprises a shell, an electrode assembly, a first electrode terminal, a fixing piece, a first adapter and a sealing piece, the electrode assembly includes a main body portion and a first tab. The first electrode terminal is at least partially arranged on the side, back to the main body part, of the wall part of the shell, the first electrode terminal is provided with a first through hole, and the orthographic projection of the first through hole is located in the orthographic projection of the electrode leading-out hole of the wall part. The fixing piece comprises a limiting part and a fixing part connected to the wall part, the limiting part is located on the side, away from the main body part, of the wall part, and a part of the first electrode terminal is located between the limiting part and the wall part in the thickness direction. The first adapter is partially accommodated in the first through hole and welded to the first electrode terminal. The sealing member partially abuts between the first electrode terminal and the wall portion, and partially abuts between the first electrode terminal and the first adapter. The structure and the assembly process of the battery monomer are simplified, and the sealing performance of the battery monomer is improved.

Description

Technical Field

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

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

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

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

[0005] According to 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, a fixing member, a first adapter and a sealing member. 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 and a first pole ear led out from the main body. The first electrode terminal is at least partially arranged on the side of the wall portion facing away from the main body, and the first electrode terminal is provided with a first through hole, and the first through hole penetrates the first electrode terminal along the thickness direction of the wall portion. In the same plane perpendicular to the thickness direction, the orthographic projection of the first through hole is located within the orthographic projection of the electrode lead-out hole. The fixing member includes a limiting portion and a fixing portion connected to each other, the limiting portion is located on the side of the wall portion facing away from the main body, and along the thickness direction, a part of the first electrode terminal is located between the limiting portion and the wall portion, and the fixing portion is connected to the wall portion. The first adapter is connected to the first pole ear, and the first adapter is partially accommodated in the first through hole and welded to the first electrode terminal. Along the thickness direction, the sealing member partially abuts between the first electrode terminal and the wall portion, and partially abuts between the first electrode terminal and the first transition member.

[0006] Along the thickness direction, the first electrode terminal and the wall portion can clamp a portion of the seal, which can improve the sealing effect between the first electrode terminal and the wall portion, and reduce the risk of electrolyte leakage from the mating interface between the first electrode terminal and the wall portion. Along the thickness direction, the first electrode terminal and the first adapter can clamp a portion of the seal, which can improve the sealing effect between the first electrode terminal and the first adapter, and reduce the risk of electrolyte leakage from the mating interface between the first electrode terminal and the first adapter, and can also reduce the risk of welding slag between the first electrode terminal and the first adapter entering the interior of the shell and causing a short circuit. The embodiment of the present application can improve the sealing effect of two places, between the first electrode terminal and the wall portion, and between the first electrode terminal and the first adapter, through a seal, which is conducive to simplifying the structure and assembly process of the battery cell and improving the sealing performance of the battery cell.

[0007] In some embodiments, the first adapter includes an adapter body, a first convex portion and a second convex portion, the adapter body is arranged on the side of the wall portion facing the main body and connected to the first electrode ear, the first convex portion protrudes from the surface of the adapter body facing the wall portion, and the second convex portion is arranged on the side of the adapter body facing the first convex portion and protrudes from the outer peripheral surface of the first convex portion; the first electrode terminal is arranged around the first convex portion and welded to the outer peripheral edge of the first convex portion, along the thickness direction, at least part of the first electrode terminal is arranged on the side of the second convex portion away from the adapter body, and the sealing member partially abuts between the second convex portion and the first electrode terminal. The first convex portion protrudes in a direction away from the main body relative to the adapter body, and the welding area of ​​the first convex portion and the first electrode terminal is more toward the outer side of the wall portion away from the main body, which is conducive to reducing the difficulty of the welding operation and improving the welding efficiency. The first convex portion and the second convex portion can also enhance the overall strength of the first adapter to a certain extent, reduce the risk of the first adapter being deformed by heat during welding, and help improve the sealing effect between the first electrode terminal and the first adapter. The second protrusion is closer to the first electrode terminal than the adapter body, which is beneficial for compressing the portion of the seal located between the second protrusion and the first electrode terminal, thereby improving the sealing effect.

[0008] In some embodiments, the first convex portion includes a first sub-portion and a second sub-portion connected to each other, along the thickness direction, at least part of the first sub-portion is arranged on the side of the second sub-portion facing away from the main body, and the second sub-portion, the second convex portion and the adapter body are integrally formed; the base metals of the first sub-portion and the second sub-portion are different, and the first electrode terminal surrounds the first sub-portion and is welded to the first sub-portion. Thus, the first adapter can be respectively connected to the first electrode terminal and the first tab with different base metals by welding, which is conducive to reducing the difficulty of welding and improving the connection strength and connection stability.

[0009] In some embodiments, along the direction from the main body to the wall, the second sub-section exceeds the surface of the second convex section facing away from the adapter body. The surface of the second convex section facing away from the adapter body is a sealing surface of the second convex section for abutting against the sealing member, which can increase the distance between the connecting surface of the first sub-section and the second sub-section and the sealing surface of the second convex section in the thickness direction, extend the penetration path of the electrolyte, and help reduce the possibility of the electrolyte contacting the connecting surface of the first sub-section and the second sub-section, and reduce the risk of the first sub-section and the second sub-section being corroded.

[0010] In some embodiments, the first electrode terminal includes a first terminal portion and a second terminal portion connected to each other, and along the thickness direction, at least part of the first terminal portion is located on the side of the second terminal portion facing away from the main body portion; the base metals of the first terminal portion and the second terminal portion are different, the base metals of the first terminal portion and the first sub-portion are the same, the first terminal portion surrounds the first sub-portion and is welded to the first sub-portion; the sealing member partially abuts between the second terminal portion and the second convex portion. On the one hand, it is helpful to reduce the welding difficulty of the first terminal portion and the first sub-portion and improve the welding effect; on the other hand, the base metals of the second terminal portion and the second convex portion used to form the seal can be the same, and the base metals of the second terminal portion and the second sub-portion can be the same, which is helpful to reduce the phenomenon of different base metals of adjacent surfaces and reduce the risk of corrosion of the first electrode terminal and the first adapter due to reaction with the electrolyte.

[0011] In some embodiments, along the thickness direction, the first terminal portion and the second terminal portion are stacked, the first sub-portion and the second sub-portion are stacked, and the first interface between the first terminal portion and the second terminal portion is flush with the second interface between the first sub-portion and the second sub-portion. It is not easy to form a mating interface with different base metals between the first terminal portion and the first sub-portion, and between the second terminal portion and the second sub-portion, which is conducive to reducing the risk of the first electrode terminal and the first adapter being corroded due to reaction with the electrolyte.

[0012] In some embodiments, the base metal of the first sub-unit is aluminum, and the base metal of the second sub-unit is copper. On the one hand, it is convenient to connect the adapter body and the first pole ear by welding, which is beneficial to improve the connection strength between the two; on the other hand, it is convenient to weld the first electrode terminal to the first sub-unit and the current collecting component, which is beneficial to improve the connection strength and reduce the cost.

[0013] In some embodiments, the first protrusion is a solid structure, thereby increasing the flow area of ​​the first protrusion and improving the deformation resistance of the first protrusion itself, which is beneficial to improving the flow capacity and overall strength of the first adapter and reducing the risk of thermal deformation of the first adapter during welding.

[0014] In some embodiments, along the direction from the main body to the wall, the surface of the first protrusion facing away from the main body exceeds the first electrode terminal. Thus, a current path is directly formed between the first adapter and the current collector, which is beneficial to improving the current capacity of the battery cell. In addition, the portion of the first protrusion extending out of the first through hole can also be accommodated in the through hole of the current collector, which is convenient for positioning the current collector and beneficial to improving assembly efficiency.

[0015] In some embodiments, the seal comprises an integrally formed first seal portion and a second seal portion, wherein along the thickness direction, the first seal portion abuts between the first electrode terminal and the first adapter, and the second seal portion is at least partially disposed on a side of the wall away from the main body portion and abuts between the first electrode terminal and the wall portion. The integrally formed first seal portion and the second seal portion are conducive to improving the sealing effect of the seal itself and further reducing the risk of liquid leakage.

[0016] In some embodiments, at least a portion of the first adapter is accommodated in the electrode lead-out hole; the seal includes a first positioning portion, the first positioning portion is connected to the first sealing portion and / or the second sealing portion, and protrudes from the surface of the second sealing portion facing the wall portion, and the first positioning portion is at least partially accommodated in the electrode lead-out hole and is located between the hole wall of the electrode lead-out hole and the outer peripheral surface of the first adapter. The first positioning portion can insulate and isolate the wall portion and the first adapter, extend the creepage distance of the current between the wall portion and the first adapter, and help reduce the risk of short circuit caused by the overlap of the wall portion and the first adapter. On the other hand, the seal can also be pre-positioned in the radial direction of the electrode lead-out hole by the first positioning portion, which helps to improve the assembly efficiency of the seal.

[0017] In some embodiments, the seal includes a second positioning portion, the second positioning portion is connected to the first sealing portion and protrudes from the surface of the first sealing portion facing the first electrode terminal, and the second positioning portion is at least partially located between the hole wall of the first through hole and the outer peripheral surface of the first adapter. During assembly, the second positioning portion can be arranged on the outer periphery of the first adapter, which can increase the area of ​​the mating interface between the seal and the first adapter, which is conducive to accurately positioning the seal and improving assembly efficiency.

[0018] In some embodiments, the first electrode terminal includes a first terminal portion and a second terminal portion connected to each other, the base metals of the first terminal portion and the second terminal portion are different, and along the thickness direction of the wall portion, at least part of the first terminal portion is located on the side of the second terminal portion that is away from the main body portion; the first adapter is welded to the first terminal portion or the second terminal portion, and along the thickness direction, the sealing member partially abuts between the second terminal portion and the wall portion, and partially abuts between the second terminal portion and the first adapter. As a result, it is convenient to connect the first terminal portion to the current collection component by welding, and the first adapter can also be selectively welded to the first terminal portion or the second terminal portion according to the structure of the first adapter, reducing the difficulty of connecting the first electrode terminal and the first adapter and improving the connection strength between the two.

[0019] In some embodiments, a portion of the first terminal portion and a portion of the second terminal portion are located between the limiting portion and the wall portion. The limiting portion can apply a force toward the wall portion to the first terminal portion and the second terminal portion, thereby pressing the first terminal portion and the second terminal portion against the wall portion. The limiting portion can also cause the first terminal portion to be pressed against the second terminal portion, which is beneficial to improving the connection strength and connection stability between the first terminal portion and the second terminal portion, and reducing the risk of cracking of the connection surface between the first terminal portion and the second terminal portion.

[0020] In some embodiments, the base metal of the first terminal is aluminum and the base metal of the second terminal is copper. On the one hand, it is convenient to weld the second terminal and the first adapter; on the other hand, it is convenient to weld the first terminal and the busbar, and also convenient to weld the busbar and the positive electrode of another battery cell.

[0021] In some embodiments, the battery cell further includes a busbar, at least part of which is located on a side of the first electrode terminal away from the wall; the busbar is welded to at least one of the first adapter and the first electrode terminal. In the embodiment of the present application, the busbar is pre-connected to the first electrode terminal and / or the first adapter, and after the battery cells are stacked, the busbar can be received and positioned, which is conducive to simplifying the assembly process.

[0022] In some embodiments, the current collecting component, the first adapter and the first electrode terminal are welded. This helps to reduce the number of welding times and improve welding efficiency. A current flow path is formed between the current collecting component and the first adapter, and a current flow path is formed between the current collecting component, the first electrode terminal and the first adapter, which can increase the current flow area and improve the current flow capacity of the battery cell.

[0023] In some embodiments, the converging component is disposed around the first adapter and welded to the outer periphery of the first adapter. The converging component and the first adapter can be welded by butt welding, which is beneficial to reduce welding power, reduce welding heat generation, and improve welding effect.

[0024] In some embodiments, the surface of the current collecting component facing the wall portion abuts against the first electrode terminal and the first adapter. On the one hand, it is conducive to achieving sealing between the portion of the first adapter accommodated in the first through hole and the hole wall of the first through hole, improving the sealing performance of the battery cell; on the other hand, it can also increase the contact area between the current collecting component and the first electrode terminal, and between the current collecting component and the first adapter, thereby increasing the flow area, which is conducive to improving the flow capacity.

[0025] In some embodiments, the busbar component includes a busbar body and a weak portion, the thickness of the weak portion is less than the thickness of the busbar body, and the weak portion, the first electrode terminal and the first adapter are welded. Since the thickness of the weak portion is relatively thin, the heat penetration efficiency can be improved, thereby reducing the welding power, reducing the welding heat generation, and improving the welding effect.

[0026] In some embodiments, the electrode assembly further includes a second pole lug extending from the main body, the second pole lug having a polarity opposite to that of the first pole lug; the battery cell further includes a second adapter and a second electrode terminal, the second adapter being connected to the second pole lug and the second electrode terminal.

[0027] In some embodiments, the housing includes a shell and an end cover, the shell has an opening, the end cover is connected to the shell and covers the opening, and the wall portion is the end cover. This is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0028] According to a second aspect of the present application, the present application provides a battery device, which includes a plurality of battery cells provided according to any embodiment of the first aspect of the present application.

[0029] According to a third aspect of the present application, the present application provides an electrical device, which includes a battery device provided according to any embodiment of the second aspect of the present application, and the battery device is used to provide electrical energy. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 It is a schematic diagram of the structure of a vehicle provided in some embodiments of the present application.

[0032] Figure 2 It is a schematic diagram of the exploded structure of the battery provided in some embodiments of the present application.

[0033] Figure 3 It is a schematic diagram of the exploded structure of a battery cell provided in some embodiments of the present application.

[0034] Figure 4 yes Figure 3 A schematic cross-sectional view of a battery cell is shown.

[0035] Figure 5 yes Figure 4 Schematic diagram of the enlarged structure of area A in the middle.

[0036] Figure 6 yes Figure 5 Schematic diagram of the enlarged structure of area B in the middle.

[0037] Figure 7 It is a partial structural cross-sectional view of a battery cell provided in the second embodiment of the present application.

[0038] Figure 8 It is a partial structural cross-sectional view of a battery cell provided in the third embodiment of the present application.

[0039] Fig. 9 It is a partial structural cross-sectional view of a battery cell provided in the fourth embodiment of the present application.

[0040] Fig.10 It is a partial structural cross-sectional view of a battery cell provided in the fifth embodiment of the present application.

[0041] Fig.11 It is a partial structural cross-sectional view of a battery cell provided in the sixth embodiment of the present application.

[0042] Fig.12 It is a partial structural schematic diagram of a battery device provided in some embodiments of the present application.

[0043] In the attached figure: Vehicle 1, battery device 2, controller 3, motor 4; Box body 5, first box body part 5a, second box body part 5b, accommodating space 5c; Battery cell 6, electrode assembly 10, main body 11, first pole ear 12, second pole ear 13, shell 20, shell 21, opening 211, end cover 22, wall 23, electrode lead hole 231, first electrode terminal 30, first through hole 31, first hole section 311, second hole section 312, first terminal portion 32, terminal body 321, step portion 322, step surface 322a, second terminal portion 33, first interface 34, first adapter 40, adapter body 41, first convex portion 42, first sub-portion 4 21, second sub-portion 422, second interface 423, first surface 42a, second convex portion 43, first step surface 43a, sealing member 50, first sealing portion 51, second sealing portion 52, first positioning portion 53, second positioning portion 54, fixing member 61, limiting portion 611, fixing portion 612, insulating member 62, busbar component 70, second surface 70a, busbar body 71, weak portion 72, second adapter 80, second electrode terminal 90, first welding portion W1, second welding portion W2, thickness direction X. DETAILED DESCRIPTION

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0069] The electrode 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. During assembly, the tab is first welded to the adapter, and the adapter is welded to the electrode terminal from one side of the adapter, and then the adapter, electrode terminal and electrode assembly are placed 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.

[0070] In some embodiments of the present application, a through hole may be provided in the electrode terminal. During assembly, the adapter and the electrode assembly are first connected and then placed into the shell together, and the adapter is at least partially accommodated in the through hole of the electrode terminal, and then the adapter and the electrode terminal are welded, which can reduce the possibility of welding particles generated during welding falling into the shell, which is conducive to reducing the risk of internal short circuit. However, after the through hole is provided in the electrode terminal, there may be a risk of electrolyte leakage between the electrode terminal and the adapter.

[0071] In view of this, an embodiment of the present application provides a technical solution, which provides a seal so that the seal partially abuts between the electrode terminal and the adapter, and can form a seal between the electrode terminal and the adapter, which is beneficial to reduce the risk of electrolyte leakage from the mating interface between the two, and can also reduce the risk of welding slag from the electrode terminal and the adapter entering the housing and causing a short circuit. In addition, the seal also partially abuts between the electrode terminal and the wall, and the seal can also form a seal between the electrode terminal and the wall, reducing the risk of electrolyte leakage from the mating interface between the electrode terminal and the wall. The embodiment of the present application can achieve two seals between the electrode terminal and the adapter, and between the electrode terminal and the wall, through a seal, which is beneficial to simplify the structure and assembly process of the battery cell and improve the sealing effect of the battery cell.

[0072] 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.

[0073] 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.

[0074] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0075] 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.

[0076] 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.

[0077] 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.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] For example, the battery cell 6 may be the smallest unit constituting the battery device 2 .

[0082] 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 .

[0083] 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.

[0084] 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.

[0085] 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.

[0086] 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 .

[0087] 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.

[0088] 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 .

[0089] 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.

[0090] The end cover 22 can be connected to the housing 21 by welding, bonding, clamping or other methods.

[0091] 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.

[0092] 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 5Schematic diagram of the enlarged structure of area B in the middle. Figure 7 is a partial structural cross-sectional view of a battery cell provided in the second embodiment of the present application, Figure 8 is a partial structural cross-sectional view of a battery cell provided in the third embodiment of the present application, Fig. 9 is a partial structural cross-sectional view of a battery cell provided in the fourth embodiment of the present application, Fig.10 is a partial structural cross-sectional view of a battery cell provided in the fifth embodiment of the present application, Fig.11 is a partial structural cross-sectional view of a battery cell provided in the sixth embodiment of the present application. It can be understood that: Figures 5 to 11 The dotted straight line in the figure is used to indicate the boundary between two adjacent components and is not the physical structure of the component.

[0093] Reference Figures 3 to 11 In some embodiments, the battery cell 6 includes an electrode assembly 10, a housing 20, a first electrode terminal 30, a first adapter 40, a seal 50 and a fixing member 61. The housing 20 includes a wall portion 23, and the wall portion 23 is provided with an electrode lead-out hole 231. The electrode assembly 10 is accommodated in the housing 20, and the electrode assembly 10 includes a main body 11 and a first electrode tab 12 led out from the main body 11. The first electrode terminal 30 is at least partially disposed on a side of the wall portion 23 facing away from the main body 11, and the first electrode terminal 30 is provided with a first through hole 31, and the first through hole 31 penetrates the first electrode terminal 30 along the thickness direction X of the wall portion 23. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 31 is located within the orthographic projection of the electrode lead-out hole 231. The fixing member 61 includes a stopper 611 and a fixing member 612 connected to each other, the stopper 611 is located on the side of the wall portion 23 away from the main body portion 11, along the thickness direction X, a portion of the first electrode terminal 30 is located between the stopper 611 and the wall portion 23, and the fixing member 612 is connected to the wall portion 23. The first adapter 40 is connected to the first electrode tab 12, the first adapter 40 is partially accommodated in the first through hole 31, and is welded to the first electrode terminal 30. Along the thickness direction X, the sealing member 50 partially abuts between the first electrode terminal 30 and the wall portion 23, and partially abuts between the first electrode terminal 30 and the first adapter 40.

[0094] 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 .

[0095] 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 pole tab 12 is led out from one end of the main body 11 close to the wall 23 , which helps to simplify the structure of the first adapter 40 and facilitates the connection between the first pole tab 12 and the first adapter 40 .

[0096] The first electrode tab 12 can be connected to the first adapter 40 by welding, abutment or other suitable methods.

[0097] In the thickness direction X, the first electrode terminal 30 may be disposed as a whole on the side of the wall portion 23 facing away from the main body portion 11, or only a portion of the first electrode terminal 30 may be disposed on the side of the wall portion 23 facing away from the main body portion 11, and the other portion of the first electrode terminal 30 may be accommodated in the electrode lead-out hole 231, for example.

[0098] A portion of the first adapter 40 is received in the first through hole 31 , and another portion of the first adapter 40 may be located on a side of the first electrode terminal 30 close to the main body 11 , so as to facilitate connection with the first electrode tab 12 .

[0099] The portion of the first adapter 40 accommodated in the first through hole 31 and the first electrode terminal 30 are welded to form a first welding portion W1. The portion of the first adapter 40 accommodated in the first through hole 31 and the first electrode terminal 30 can be butt welded. The hole wall of the first through hole 31 and the portion of the first adapter 40 accommodated in the first through hole 31 can be heated by laser or other means, so that the contacting portion of the first electrode terminal 30 and the first adapter 40 melts and fuses together, and the fused portion solidifies to form the first welding portion W1. The first welding portion W1 can be directly connected to the hole wall of the first through hole 31 and the outer periphery of the portion of the first adapter 40 accommodated in the first through hole 31.

[0100] The first welding portion W1 may be exposed on the side of the first electrode terminal 30 facing away from the main body 11, and the side of the first electrode terminal 30 facing away from the main body 11 along the thickness direction X is the outer side of the first electrode terminal 30. The first welding portion W1 may be revealed and exposed from the outer side of the first electrode terminal 30. During welding, the first electrode terminal 30 and the first adapter 40 may receive welding heat (e.g., receiving irradiated laser) from the outer side of the first electrode terminal 30. During assembly, the first adapter 40 and the electrode assembly 10 may be connected first and then put into the shell together, and a part of the first adapter 40 may be accommodated in the first through hole 31, and then the first adapter 40 and the first electrode terminal 30 may be welded, which may reduce the possibility of welding particles generated during welding falling into the outer shell 20, and is conducive to reducing the risk of internal short circuit.

[0101] The number of the first welding portion W1 may be one or more.

[0102] The first welding portion W1 may be in a strip, ring, arc or other suitable shape. Optionally, the first welding portion W1 is in a ring shape, which is beneficial to improve the sealing effect between the first electrode terminal 30 and the first adapter 40 through the first welding portion W1.

[0103] The limiting portion 611 may be disposed around a portion of the first electrode terminal 30. The fixing portion 612 may be bent or curved from the limiting portion 611 toward the wall portion 23 and extend. The fixing portion 612 may be disposed along the outer circumference of the first electrode terminal 30.

[0104] The fixing portion 612 can be connected to the wall portion 23 by welding, bonding or other suitable methods, and fixed relative to the wall portion 23 .

[0105] Along the thickness direction X, a portion of the first electrode terminal 30 is located between the limiting portion 611 and the wall portion 23. The limiting portion 611 can apply a force toward the wall portion 23 to the first electrode terminal 30, which is beneficial for pressing the first electrode terminal 30 against the wall portion 23, thereby 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.

[0106] Optionally, the limiting portion 611 and the fixing portion 612 may be an integrally formed structure.

[0107] Optionally, the fixing member 61 may be made of metal to improve the structural strength of the fixing member 61 itself, thereby improving the connection strength and stability between the fixing portion 612 and the wall portion 23 , and the limiting effect of the limiting portion 611 on the first electrode terminal 30 .

[0108] In some examples, the stopper 611 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 61, so that the wall portion 23 is charged. In other examples, an insulating member may also be provided between the stopper 611 and the first electrode terminal 30 along the thickness direction X, and the stopper 611 may be indirectly pressed and matched with the first electrode terminal 30 through the insulating member, and the fixing member 61 may be insulated and isolated from the first electrode terminal 30 through the insulating member.

[0109] The first electrode terminal 30 is arranged on the wall portion 23 through the fixing member 61, which is conducive to simplifying the assembly of the first electrode terminal 30. In addition, the first electrode terminal 30 can be arranged as a whole on the side of the wall portion 23 away from the main body portion 11, which can reduce the space occupied in the outer shell 20, which is conducive to increasing the size of the electrode assembly 10 within a limited space and increasing the capacity of the battery cell 6.

[0110] The electrode lead-out hole 231 penetrates the wall portion 23 along the thickness direction X. In the same plane perpendicular to the thickness direction X, the orthographic projection area of ​​the first through hole 31 may be smaller than the orthographic projection area of ​​the electrode lead-out hole 231, and the orthographic projection of the first electrode terminal 30 and the orthographic projection of the electrode lead-out hole 231 partially overlap.

[0111] At least a portion of the first adapter 40 may be inserted into the electrode lead-out hole 231 to be connected to the first electrode terminal 30. In the same plane perpendicular to the thickness direction X, the orthographic projections of the first adapter 40, the electrode lead-out hole 231, and the orthographic projections of the first electrode terminal 30 partially overlap.

[0112] The sealing member 50 is an integrally formed structure. Along the thickness direction X, a portion of the sealing member 50 may be disposed between the first electrode terminal 30 and the wall portion 23 and abut against the first electrode terminal 30 and the wall portion 23, and a portion of the sealing member 50 may be disposed between the first electrode terminal 30 and the first adapter 40 and abut against the first electrode terminal 30 and the first adapter 40.

[0113] The seal 50 may be disposed along the outer circumference of a portion of the first adapter 40. Optionally, the seal 50 may be an annular structure, and the seal 50 is disposed around a portion of the first adapter 40 to improve the sealing uniformity between the first electrode terminal 30 and the first adapter 40.

[0114] The seal 50 may be made of plastic, rubber or other suitable materials so that the seal 50 can be deformed appropriately, thereby improving its sealing effect. Optionally, the seal 50 may be an insulating member, and the seal 50 may also insulate and isolate the first electrode terminal 30 from the wall portion 23 .

[0115] Along the thickness direction X, the first electrode terminal 30 and the wall portion 23 can clamp a portion of the seal 50, which can improve the sealing effect between the first electrode terminal 30 and the wall portion 23, and reduce the risk of electrolyte leakage from the matching interface between the first electrode terminal 30 and the wall portion 23. Along the thickness direction X, the first electrode terminal 30 and the first adapter 40 can clamp a portion of the seal 50, which can improve the sealing effect between the first electrode terminal 30 and the first adapter 40, reduce the risk of electrolyte leakage from the matching interface between the first electrode terminal 30 and the first adapter 40, and also reduce the risk of welding slag between the first electrode terminal 30 and the first adapter 40 entering the interior of the housing 20 and causing a short circuit.

[0116] The embodiment of the present application can improve the sealing effect between the first electrode terminal 30 and the wall portion 23 and between the first electrode terminal 30 and the first adapter 40 through a seal 50, which is beneficial to simplify the structure and assembly process of the battery cell 6 and improve the sealing performance of the battery cell 6.

[0117] In some embodiments, the battery cell 6 further includes an insulating support member, which is disposed on the main body 11 and between the main body 11 and the first adapter 40. The insulating support member can be used to support the first adapter 40, which is conducive to reducing the difficulty of connecting the first electrode terminal 30 and the first adapter 40 and improving the connection effect between the two.

[0118] Optionally, the insulating support member may be an insulating film, an insulating bracket or other components that can perform insulating and supporting functions.

[0119] In some embodiments, reference Figures 5 to 11 The first adapter 40 includes an adapter body 41, a first convex portion 42, and a second convex portion 43. The adapter body 41 is disposed on the side of the wall portion 23 facing the main body 11 and connected to the first electrode tab 12. The first convex portion 42 protrudes from the surface of the adapter body 41 facing the wall portion 23. The second convex portion 43 is disposed on the side of the adapter body 41 facing the first convex portion 42 and protrudes from the outer peripheral surface of the first convex portion 42. The first electrode terminal 30 is disposed around the first convex portion 42 and welded to the outer peripheral edge of the first convex portion 42. Along the thickness direction X, at least a portion of the first electrode terminal 30 is disposed on the side of the second convex portion 43 facing away from the adapter body 41, and the sealing member 50 partially abuts between the second convex portion 43 and the first electrode terminal 30.

[0120] exist Figure 5 , Figures 7 to 11 In the figure, the adapter body 41, the first protrusion 42 and the second protrusion 43 can be divided by a virtual straight line.

[0121] The first protrusion 42 is at least partially received in the first through hole 31 , and the outer periphery of the first protrusion 42 is welded to the hole wall of the first through hole 31 .

[0122] The first protrusion 42 matches the shape of the first through hole 31. Optionally, the first protrusion 42 may be a cylinder, and the second protrusion 43 is located radially outside the first protrusion 42 and protrudes outwardly from the outer peripheral surface of the first protrusion 42 in the radial direction of the first protrusion 42.

[0123] The second protrusion 43 may protrude from the surface of the adapter body 41 facing the wall portion 23 along the thickness direction X. The first protrusion 42 is connected to the adapter body 41, and the second protrusion 43 is connected to the adapter body 41 and the first protrusion 42. The second protrusion 43 may form a step-like structure, and a side of the second protrusion 43 facing away from the adapter body 41 may form a first step surface 43a, and a portion of the sealing member 50 is located between the first electrode terminal 30 and the first step surface 43a, and abuts against the first electrode terminal 30 and the first step surface 43a.

[0124] Optionally, along the thickness direction X, the surface of the wall portion 23 used to abut against the seal 50 and the first step surface 43a can be arranged flush. In other words, there is no height difference between the surface of the wall portion 23 and the surface of the first adapter 40 used to abut against the same side of the seal 50. When the seal 50 is a structure of equal thickness, the bending phenomenon of the seal 50 can be reduced, which is beneficial to improving the sealing effect.

[0125] The adapter body 41 is disposed on the side of the wall portion 23 facing the main body portion 11 , and the positional relationship between the adapter body 41 and the wall portion 23 can limit the movement of the first adapter 40 in the thickness direction X away from the main body portion 11 , thereby reducing the risk of the first adapter 40 falling out of the housing 20 .

[0126] The first protrusion 42 protrudes in a direction away from the main body 11 relative to the adapter body 41, and the welding area of ​​the first protrusion 42 and the first electrode terminal 30 is more toward the wall portion 23 away from the outside of the main body 11, which is conducive to reducing the difficulty of the welding operation and improving the welding efficiency. The first protrusion 42 and the second protrusion 43 can also enhance the overall strength of the first adapter 40 to a certain extent, reduce the risk of the first adapter 40 being deformed by heat during welding, and help improve the sealing effect between the first electrode terminal 30 and the first adapter 40. The second protrusion 43 is closer to the first electrode terminal 30 than the adapter body 41, which is conducive to compressing the portion of the sealing member 50 located between the second protrusion 43 and the first electrode terminal 30, thereby improving the sealing effect.

[0127] In some embodiments, reference Figures 5 to 7 The first protrusion 42 includes a first sub-section 421 and a second sub-section 422 connected to each other. Along the thickness direction X, at least part of the first sub-section 421 is arranged on the side of the second sub-section 422 facing away from the main body 11. The second sub-section 422, the second protrusion 43 and the adapter body 41 are integrally formed. The base metals of the first sub-section 421 and the second sub-section 422 are different. The first electrode terminal 30 surrounds the first sub-section 421 and is welded to the first sub-section 421.

[0128] Optionally, the first sub-section 421 and the second sub-section 422 may be 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 sub-section 421 and the second sub-section 422 and reducing the risk of separation or fracture of the connection surfaces of the first sub-section 421 and the second sub-section 422.

[0129] The second sub-portion 422 , the second convex portion 43 and the adapter body 41 are integrally formed, and the base metal of the second sub-portion 422 , the second convex portion 43 and the adapter body 41 is the same.

[0130] In the present embodiment, “base metal” refers to the main metal component. For example, the main metal component of the first sub-section 421 is different from the main metal component of the second sub-section 422, and the main metal component of the second sub-section 422, the second protrusion 43 and the adapter body 41 is the same.

[0131] At least a portion of the base metal of the first electrode terminal 30 is the same as the base metal of the first sub-portion 421 , so as to reduce the difficulty of welding therebetween and improve the welding strength.

[0132] In some examples, reference Figure 7 , the first electrode terminal 30 is an integrally formed structure, and the base metal of the first electrode terminal 30 is the same as the base metal of the first sub-portion 421. In other examples, referring to Figure 5 and Figure 6 The first electrode terminal 30 includes two parts with different base metals, wherein the base metal of the part of the first electrode terminal 30 surrounding the first sub-portion 421 is different from the base metal of the first sub-portion 421 .

[0133] Optionally, the first pole tab 12 is a negative pole tab. The second sub-portion 422, the second protrusion 43 and the transition body 41 may be made of copper or copper alloy, and the base metals of the second sub-portion 422, the second protrusion 43 and the transition body 41 are all copper, so that the transition body 41 is welded to the first pole tab 12 by welding. At least part of the first electrode terminal 30 and the first sub-portion 421 may be made of aluminum or aluminum alloy, and the base metals of at least part of the first electrode terminal 30 and the first sub-portion 421 are aluminum, so as to facilitate the connection of the busbar component whose base metal is aluminum.

[0134] In the embodiment of the present application, the first protrusion 42 is configured to include a first sub-portion 421 and a second sub-portion 422 with different base metals. The first adapter 40 can be respectively connected to the first electrode terminal 30 and the first electrode tab 12 with different base metals by welding, which is beneficial to reduce the welding difficulty and improve the connection strength and connection stability.

[0135] In some embodiments, reference Figures 5 to 7 , along the direction from the main body 11 to the wall 23, the second sub-portion 422 exceeds the surface of the second convex portion 43 facing away from the adapter body 41. In other words, along the direction from the main body 11 to the wall 23, the connecting surface of the first sub-portion 421 and the second sub-portion 422 is farther away from the adapter body 41 than the first step surface 43a.

[0136] The first electrode terminal 30 may be disposed only around the first sub-portion 421 , or may be disposed around the first sub-portion 421 and a portion of the second sub-portion 422 .

[0137] The second protrusion 43 may be connected to the second sub-portion 422 and protrude from the outer circumference of the second sub-portion 422. The second protrusion 43 and the second sub-portion 422 form a step structure.

[0138] The base metals of the first sub-section 421 and the second sub-section 422 are different, and a connection surface with different base metals, such as a copper-aluminum composite surface, is formed between the first sub-section 421 and the second sub-section 422. If the electrolyte penetrates into the connection surface of the first sub-section 421 and the second sub-section 422, it may produce an electrochemical reaction with the two different base metals, thereby corroding the first sub-section 421 and the second sub-section 422.

[0139] To this end, in the embodiment of the present application, the second sub-portion 422 is arranged to extend beyond the surface of the second protrusion 43 facing away from the adapter body 41 along the direction from the main body 11 to the wall portion 23. The surface of the second protrusion 43 facing away from the adapter body 41 is a sealing surface of the second protrusion 43 for abutting against the seal 50. This can increase the distance between the connecting surface of the first sub-portion 421 and the second sub-portion 422 and the sealing surface of the second protrusion 43 along the thickness direction X, extend the penetration path of the electrolyte, and help reduce the possibility of the electrolyte contacting the connecting surface of the first sub-portion 421 and the second sub-portion 422, thereby reducing the risk of corrosion of the first sub-portion 421 and the second sub-portion 422.

[0140] In some alternative embodiments, along the thickness direction X, the surface of the second sub-portion 422 facing the first sub-portion 421 may also be flush with the first step surface 43 a.

[0141] In some embodiments, reference Figure 5 and Figure 6 The first electrode terminal 30 includes a first terminal portion 32 and a second terminal portion 33 connected to each other. Along the thickness direction X, at least a portion of the first terminal portion 32 is located on the side of the second terminal portion 33 facing away from the main body portion 11. The base metals of the first terminal portion 32 and the second terminal portion 33 are different, and the base metals of the first terminal portion 32 and the first sub-portion 421 are the same. The first terminal portion 32 surrounds the first sub-portion 421 and is welded to the first sub-portion 421. The sealing member 50 partially abuts between the second terminal portion 33 and the second protrusion 43.

[0142] Optionally, the first terminal portion 32 and the second terminal portion 33 may be 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 32 and the second terminal portion 33, and reduces the risk of the connection surfaces of the first terminal portion 32 and the second terminal portion 33 being separated or broken from each other.

[0143] Along the thickness direction X, the first terminal portion 32 may be located as a whole on the side of the second terminal portion 33 facing away from the main body portion 11, or only a portion of the first terminal portion 32 may be located on the side of the second terminal portion 33 facing away from the main body portion 11, and the other portion of the first terminal portion 32 may be arranged on the periphery of the second terminal portion 33, for example.

[0144] The second terminal portion 33 may surround at least one of the first sub-portion 421 and the second sub-portion 422. Optionally, the second terminal portion 33 may surround the first sub-portion 421, or may be completely offset from the first sub-portion 421 along the thickness direction X. The second terminal portion 33 and the first sub-portion 421, and the second terminal portion 33 and the second sub-portion 422 may be connected or not connected.

[0145] The first through hole 31 penetrates the first terminal portion 32 and the second terminal portion 33 along the thickness direction X. Figure 6 The first through hole 31 may include a first hole section 311 and a second hole section 312, wherein the first hole section 311 is formed in the first terminal portion 32, and the second hole section 312 is formed in the second terminal portion 33. At least a portion of the first sub-portion 421 is accommodated in the first hole section 311 and welded to the hole wall of the first hole section 311. The first sub-portion 421 and the first terminal portion 32 are welded to form a first welding portion W1, which is directly connected to the outer periphery of the first sub-portion 421 and the hole wall of the first hole section 311. A portion of the second sub-portion 422 may be accommodated in the second hole section 312.

[0146] A portion of the sealing member 50 may be disposed between the second terminal portion 33 and the second protrusion 43 , and abut against the second terminal portion 33 and the second protrusion 43 .

[0147] The base metals of the second terminal portion 33, the second sub-portion 422, the second protrusion 43 and the transition body 41 are the same. Optionally, the base metals of the first terminal portion 32 and the first sub-portion 421 are aluminum, and the base metals of the second terminal portion 33 and the second sub-portion 422 are copper.

[0148] In the embodiment of the present application, the first electrode terminal 30 is configured to include a first terminal portion 32 and a second terminal portion 33 with different base metals, which is conducive to reducing the difficulty of welding the first terminal portion 32 and the first sub-portion 421 and improving the welding effect. In addition, the base metals of the second terminal portion 33 and the second convex portion 43 used to form a seal can be the same, and the base metals of the second terminal portion 33 and the second sub-portion 422 can be the same, which is conducive to reducing the phenomenon of different base metals of adjacent surfaces and reducing the risk of corrosion of the first electrode terminal 30 and the first adapter 40 due to reaction with the electrolyte.

[0149] In some embodiments, reference Figure 5Along the thickness direction X, the first terminal portion 32 and the second terminal portion 33 are stacked, the first sub-portion 421 and the second sub-portion 422 are stacked, and the first interface 34 between the first terminal portion 32 and the second terminal portion 33 is flush with the second interface 423 between the first sub-portion 421 and the second sub-portion 422.

[0150] The first interface 34 between the first terminal portion 32 and the second terminal portion 33 is a connection surface between the first terminal portion 32 and the second terminal portion 33. The second interface 423 between the first sub-portion 421 and the second sub-portion 422 is a connection surface between the first sub-portion 421 and the second sub-portion 422.

[0151] Optionally, both the first interface 34 and the second interface 423 may be perpendicular to the thickness direction X.

[0152] The first terminal portion 32 is only arranged around the first sub-portion 421, and the second terminal portion 33 is only arranged around the second sub-portion 422. The base metal of the first terminal portion 32 and the first sub-portion 421 is the same, and the base metal of the second terminal portion 33 and the second sub-portion 422 is the same. It is not easy to form a matching interface with different base metals between the first terminal portion 32 and the first sub-portion 421, and between the second terminal portion 33 and the second sub-portion 422, which is conducive to reducing the risk of the first electrode terminal 30 and the first adapter 40 being corroded due to reaction with the electrolyte.

[0153] In some embodiments, the base metal of the first sub-portion 421 is aluminum, and the base metal of the second sub-portion 422 is copper.

[0154] Accordingly, the base metal of the second protrusion 43 and the adapter body 41 is copper, and the base metal of the adapter body 41 is the same as that of the first pole tab 12, so that the adapter body 41 and the first pole tab 12 are connected by welding, which is beneficial to improve the connection strength between the two. The base metal of the first sub-portion 421 is aluminum, and at least part of the base metal of the first electrode terminal 30 for welding with the first sub-portion 421 can be set to aluminum, which is convenient for the first electrode terminal 30 to be welded to the first sub-portion 421 and the busbar component, which is beneficial to improve the connection strength and reduce the cost.

[0155] In some embodiments, the first protrusion 42 is a solid structure.

[0156] Optionally, the surface of the adapter body 41 facing the main body 11 may be a continuous surface.

[0157] The first protrusion 42 is not provided with a recessed portion, a through hole or other structures, which can increase the flow area of ​​the first protrusion 42 and enhance the deformation resistance of the first protrusion 42 itself, thereby improving the flow capacity and overall strength of the first adapter 40 and reducing the risk of heat deformation of the first adapter 40 during welding.

[0158] In some embodiments, reference Fig.10 , along the direction from the main body 11 to the wall 23 , the surface of the first protrusion 42 facing away from the main body 11 exceeds the first electrode terminal 30 .

[0159] Along the thickness direction X, a portion of the first protrusion 42 may protrude from a surface of the first terminal portion 32 facing away from the main body portion 11 .

[0160] Along the direction from the main body 11 to the wall 23, a portion of the first protrusion 42 can extend out of the first through hole 31, and the portion of the first protrusion 42 extending out of the first through hole 31 can be used to connect the current collecting component to directly form a flow path between the first adapter 40 and the current collecting component, which is beneficial to improving the flow capacity of the battery cell 6. In addition, the portion of the first protrusion 42 extending out of the first through hole 31 can also be accommodated in the through hole of the current collecting component, which is convenient for positioning the current collecting component and is beneficial to improving assembly efficiency.

[0161] In some embodiments, reference Figure 6 The sealing member 50 includes an integrally formed first sealing portion 51 and a second sealing portion 52. Along the thickness direction X, the first sealing portion 51 abuts between the first electrode terminal 30 and the first adapter 40, and the second sealing portion 52 is at least partially disposed on a side of the wall portion 23 away from the main body portion 11, and abuts between the first electrode terminal 30 and the wall portion 23.

[0162] Optionally, along the thickness direction X, the first sealing portion 51 may be arranged between the second terminal portion 33 and the second protrusion 43, and abut against the second terminal portion 33 and the second protrusion 43; at least part of the second sealing portion 52 is arranged between the second terminal portion 33 and the wall portion 23, and abuts against the second terminal portion 33 and the wall portion 23.

[0163] The second protrusion 43 can be at least partially accommodated in the electrode lead-out hole 231, and the outer peripheral surface of the second protrusion 43 and the hole wall of the electrode lead-out hole 231 can be spaced apart to facilitate the assembly of the first adapter 40. A portion of the second sealing portion 52 can abut between the second terminal portion 33 and the wall portion 23, and in the same plane perpendicular to the thickness direction X, the orthographic projection of another portion of the second sealing portion 52 can be located within the orthographic projection of the electrode lead-out hole 231.

[0164] The sealing member 50 may be an annular structure. The first sealing portion 51 may be disposed around the first adapter 40. The second sealing portion 52 surrounds and is connected to the outer periphery of the first sealing portion 51.

[0165] The first sealing portion 51 may be of equal thickness or unequal thickness. The second sealing portion 52 may be of equal thickness or unequal thickness. Along the thickness direction X, the thickness of the first sealing portion 51 and the thickness of the second sealing portion 52 may be the same or different.

[0166] The first sealing portion 51 can form a seal between the first electrode terminal 30 and the first adapter 40, and the second sealing portion 52 can form a seal between the first electrode terminal 30 and the wall portion 23. The first sealing portion 51 and the second sealing portion 52 are integrally formed, which is conducive to improving the sealing effect of the sealing member 50 itself and further reducing the risk of leakage.

[0167] In some embodiments, reference Figure 6 , at least part of the first adapter 40 is accommodated in the electrode lead-out hole 231. The sealing member 50 includes a first positioning portion 53, which is connected to the first sealing portion 51 and / or the second sealing portion 52 and protrudes from the surface of the second sealing portion 52 facing the wall portion 23. The first positioning portion 53 is at least partially accommodated in the electrode lead-out hole 231 and is located between the hole wall of the electrode lead-out hole 231 and the outer peripheral surface of the first adapter 40.

[0168] Optionally, at least a portion of the second protrusion 43 may be received in the electrode lead-out hole 231 . At least a portion of the first positioning portion 53 may be located between the hole wall of the electrode lead-out hole 231 and the outer circumferential surface of the second protrusion 43 .

[0169] The outer peripheral surface of the second protrusion 43 and / or the hole wall of the electrode lead-out hole 231 are spaced apart from the first positioning portion 53 to facilitate assembly of the sealing member 50 .

[0170] The first positioning portion 53 can insulate and isolate the wall portion 23 and the first adapter 40, extend the creepage distance of the current between the wall portion 23 and the first adapter 40, and help reduce the risk of short circuit caused by the overlap of the wall portion 23 and the first adapter. On the other hand, the first positioning portion 53 can also be used to pre-position the seal 50 in the radial direction of the electrode lead-out hole 231, which is conducive to improving the assembly efficiency of the seal 50.

[0171] In some embodiments, reference Figure 6 The sealing member 50 includes a second positioning portion 54, which is connected to the first sealing portion 51 and protrudes from the surface of the first sealing portion 51 facing the first electrode terminal 30. The second positioning portion 54 is at least partially located between the hole wall of the first through hole 31 and the outer peripheral surface of the first adapter 40.

[0172] exist Figure 6 In the figure, the first sealing portion 51, the second sealing portion 52, the first positioning portion 53 and the second positioning portion 54 can be divided by a virtual straight line.

[0173] Optionally, the second positioning portion 54 may be located between the hole wall of the second hole segment 312 and the outer peripheral surface of the first protrusion 42. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first hole segment 311 is located within the orthographic projection of the second hole segment 312, and the orthographic projection range of the second hole segment 312 exceeds the orthographic projection range of the first hole segment 311. The cross-section area of ​​the second hole segment 312 perpendicular to the thickness direction X is larger, and can be used to accommodate a portion of the first protrusion 42 and at least a portion of the second positioning portion 54.

[0174] The second positioning portion 54 may be disposed around the first protrusion 42 , and the outer circumferential surfaces of the second positioning portion 54 and the first protrusion 42 may be in contact with each other or may be disposed at an interval.

[0175] A portion of the first electrode terminal 30 may surround the second positioning portion 54 . Optionally, the second terminal portion 33 may be disposed around the second positioning portion 54 .

[0176] During assembly, the second positioning portion 54 may be disposed on the outer periphery of the first adapter 40 , which may increase the area of ​​the mating interface between the seal 50 and the first adapter 40 , thereby facilitating accurate positioning of the seal 50 and improving assembly efficiency.

[0177] In some embodiments, reference Figure 5 , Figure 6 and Fig. 9 The first electrode terminal 30 includes a first terminal portion 32 and a second terminal portion 33 connected to each other, and the base metals of the first terminal portion 32 and the second terminal portion 33 are different. Along the thickness direction X of the wall portion 23, at least part of the first terminal portion 32 is located on the side of the second terminal portion 33 facing away from the main body portion 11. The first adapter 40 is welded to the first terminal portion 32 or the second terminal portion 33, and along the thickness direction X, the sealing member 50 partially abuts between the second terminal portion 33 and the wall portion 23, and partially abuts between the second terminal portion 33 and the first adapter 40.

[0178] In some examples, reference Figure 8 and Fig. 9 The first adapter 40 may be an integrally formed structure, the base metal of the first adapter 40 is the same as the base metal of the second terminal portion 33 , and the first adapter 40 is welded to the second terminal portion 33 .

[0179] In other examples, refer to Figures 5 to 7 The first adapter 40 may also include two parts with different base metals, one part has the same base metal as the first terminal portion 32 and is welded to the first terminal portion 32 , and the other part has the same base metal as the second terminal portion 33 .

[0180] In the embodiment of the present application, the first electrode terminal 30 is configured to include a first terminal portion 32 and a second terminal portion 33 with different base metals, so that the first terminal portion 32 can be connected to the busbar component by welding. The first adapter 40 can also be selectively welded to the first terminal portion 32 or the second terminal portion 33 according to the structure of the first adapter 40, thereby reducing the difficulty of connecting the first electrode terminal 30 and the first adapter 40 and improving the connection strength between the two.

[0181] In some embodiments, reference Figure 6 , a portion of the first terminal portion 32 and a portion of the second terminal portion 33 are located between the limiting portion 611 and the wall portion 23 .

[0182] The first electrode terminal 30 may be disposed on a side of the wall portion 23 facing away from the main body portion 11 , and the first terminal portion 32 may be disposed on a side of the second terminal portion 33 facing away from the wall portion 23 .

[0183] Optionally, the first terminal portion 32 has a terminal body 321 and a step portion 322, and the step portion 322 protrudes from the outer peripheral surface of the terminal body 321. Along the thickness direction X, at least part of the step portion 322 is located between the second terminal portion 33 and the limiting portion 611. The step portion 322 has a step surface 322a facing away from the second terminal portion 33 along the thickness direction X, and the limiting portion 611 can directly abut against the step surface 322a, or can be indirectly pressed and matched with the step surface 322a through other structures (such as an insulating member).

[0184] The limiting portion 611 can apply a force toward the wall portion 23 to the first terminal portion 32 and the second terminal portion 33, so as to press the first terminal portion 32 and the second terminal portion 33 against the wall portion 23. The limiting portion 611 can also cause the first terminal portion 32 to be pressed against the second terminal portion 33, which is beneficial to improving the connection strength and connection stability between the first terminal portion 32 and the second terminal portion 33, and reducing the risk of cracking of the connection surface between the first terminal portion 32 and the second terminal portion 33.

[0185] In some embodiments, reference Figures 5 to 11 The battery cell 6 further includes an insulating member 62, which at least partially surrounds the first electrode terminal 30 and is fixed relative to the first electrode terminal 30. The limiting portion 611 may be embedded in the interior of the insulating member 62. The fixing portion 612 may be entirely disposed on the outer periphery of the insulating member 62, a portion of the fixing portion 612 may also be embedded in the interior of the insulating member 62, and another portion of the fixing portion 612 is connected to the wall portion 23.

[0186] The insulating member 62 may be made of a high temperature resistant insulating material. Optionally, the insulating member 62 may be a plastic member. The insulating member 62 may be disposed on the outer periphery of the first electrode terminal 30 by integral injection molding.

[0187] The insulating member 62 can cover the limiting portion 611 and a part of the fixing portion 612. On the one hand, it is beneficial to enhance the installation stability of the fixing member 61. On the other hand, it can also reduce the possibility of overlapping between the limiting portion 611 and the first electrode terminal 30 or the busbar component, reduce the possibility of overlapping between the fixing portion 612 and the first electrode terminal 30, and reduce the risk of short circuit.

[0188] In some embodiments, the base metal of the first terminal portion 32 is aluminum, and the base metal of the second terminal portion 33 is copper.

[0189] Accordingly, at least a portion of the base metal of the first adapter 40 is copper so as to be welded to the first electrode tab 12 .

[0190] The first electrode tab 12 is a negative electrode tab, and the material of the negative electrode tab is copper. In the embodiment of the present application, the base metal of the second terminal portion 33 is set to copper, which facilitates welding between the second terminal portion 33 and the first adapter 40 .

[0191] The first terminal portion 32 is used to connect the busbar, which is used to connect 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 first terminal portion 32 is set to aluminum, which is convenient for welding between the first terminal portion 32 and the busbar, and also convenient for welding between the busbar and the positive electrode of another battery cell 6.

[0192] In some embodiments, reference Fig.10 and Fig.11 The battery cell 6 further includes a current collecting component 70, at least part of which is located on a side of the first electrode terminal 30 away from the wall portion 23. The current collecting component 70 is welded to at least one of the first adapter 40 and the first electrode terminal 30.

[0193] In some examples, in the first adapter 40 and the first electrode terminal 30, the busbar component 70 is only welded to the first electrode terminal 30. A current path is formed between the busbar component 70, the first electrode terminal 30, the first adapter 40, and the first electrode tab 12. The busbar component 70 and the first adapter 40 may be electrically connected by contact, or may not be electrically connected.

[0194] In other examples, in the first adapter 40 and the first electrode terminal 30, the current collecting component 70 is only welded to the first adapter 40. A current flow path is formed between the current collecting component 70, the first adapter 40 and the first electrode tab 12. The current collecting component 70 and the first electrode terminal 30 may be electrically connected by contact, or may not be electrically connected.

[0195] In some other examples, the busbar component 70 is welded to both the first electrode terminal 30 and the first adapter 40. The busbar component 70, the first electrode terminal 30, and the first adapter 40 may be welded in one welding operation, or the busbar component 70 and the first electrode terminal 30, and the busbar component 70 and the first adapter 40 may be welded in different welding operations.

[0196] In the related art, a plurality of battery cells 6 are usually stacked first, and then the plurality of battery cells 6 are connected to a plurality of busbars to achieve electrical connection between the plurality of battery cells. The battery cells and busbars are supplied separately, and the busbars need to be positioned when assembling, which makes the assembly process complicated.

[0197] In the embodiment of the present application, the busbar component 70 is pre-connected to the first electrode terminal 30 and / or the first adapter 40 . After the battery cells 6 are stacked, the busbar component 70 can be received and positioned, which is beneficial to simplify the assembly process.

[0198] In some embodiments, reference Fig.10 and Fig.11 , the busbar component 70 , the first adapter 40 and the first electrode terminal 30 are welded.

[0199] The busbar component 70 , the first adapter 40 , and the first electrode terminal 30 are welded to form a second welding portion W2 , and the first welding portion W1 is a portion of the second welding portion W2 .

[0200] During the welding operation, the adjacent portions of the busbar component 70, the first electrode terminal 30 and the first adapter 40 can be heated by laser or other means, so that at least the adjacent portions of the busbar component 70, the first electrode terminal 30 and the first adapter 40 are melted and fused together, and the fused portions can form a second welding portion W2 after solidification.

[0201] The number of the second welding portion W2 may be one or more.

[0202] The second welding portion W2 may be in a strip, ring, arc or other suitable shapes.

[0203] The current collecting component 70, the first electrode terminal 30 and the first adapter 40 are welded simultaneously in one welding operation, which is beneficial to reducing the number of welding times and improving welding efficiency. A current flow path is formed between the current collecting component 70 and the first adapter 40, and a current flow path is formed between the current collecting component 70, the first electrode terminal 30 and the first adapter 40, which can increase the current flow area and improve the current flow capacity of the battery cell 6.

[0204] In some embodiments, reference Fig.10The conduit component 70 is disposed around the first adapter 40 and welded to the outer periphery of the first adapter 40 .

[0205] The conduit component 70 may have a second through hole, and the second through hole passes through the conduit component 70 along the thickness direction X. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 31 and the orthographic projection of the second through hole at least partially overlap. A portion of the first adapter 40 is accommodated in the second through hole, and the portion of the first adapter 40 accommodated in the second through hole is welded to the conduit component 70.

[0206] Optionally, the weld mark between the busbar component 70 and the first adapter 40 can be a ring structure surrounding the first adapter 40 to increase the flow area of ​​the weld mark, which is beneficial to improving the uniformity of the current density between the busbar component 70 and the first adapter 40, reducing the internal resistance, and improving the flow capacity.

[0207] Optionally, the first adapter 40 may be butt-welded to the busbar component 70 and the first electrode terminal 30 at the same time.

[0208] Optionally, a portion of the first protrusion 42 is received in the second through hole and welded to the busbar member 70 . A portion of the first protrusion 42 is also received in the first through hole 31 and welded to the first electrode terminal 30 .

[0209] Along the thickness direction X, the first convex portion 42 has a first surface 42a facing away from the main body 11, and the busbar component 70 has a second surface 70a facing away from the main body 11, and the first surface 42a and the second surface 70a are flush. Therefore, not only is the welding operation convenient, but also the weld marks between the busbar component 70 and the first electrode terminal 30 can be connected to the first surface 42a and the second surface 70a, which is conducive to enhancing the welding strength between the busbar component 70 and the first electrode terminal 30, increasing the weld mark area between the two, and improving the current carrying capacity.

[0210] In the embodiment of the present application, the conduit component 70 is disposed around the first adapter 40, and the conduit component 70 and the first adapter 40 can be welded by a butt-welding method, which is beneficial to reduce welding power, reduce welding heat generation, and improve welding effect.

[0211] In some embodiments, reference Fig.11 The surface of the busbar component 70 facing the wall portion 23 abuts against the first electrode terminal 30 and the first adapter 40 .

[0212] In the thickness direction X, the busbar member 70 may cover the first through hole 31 .

[0213] The confluence component 70 and the first adapter 40 can be welded by laser penetration. The weld mark between the confluence component 70 and the first adapter 40 can be connected to the surface of the first adapter 40 facing the confluence component 70 along the thickness direction X, or can be connected to the outer peripheral surface of the first adapter 40.

[0214] The busbar 70 and the first electrode terminal 30 can be welded by laser penetration. The weld mark between the busbar 70 and the first electrode terminal 30 can be connected to the surface of the first electrode terminal 30 facing the busbar 70 along the thickness direction X, or can be connected to the hole wall of the first through hole 31.

[0215] In the embodiment of the present application, the busbar component 70 is abutted against the first electrode terminal 30 and the first adapter 40. On the one hand, it is beneficial to achieve sealing between the portion of the first adapter 40 accommodated in the first through hole 31 and the hole wall of the first through hole 31, thereby improving the sealing performance of the battery cell 6; on the other hand, it can also increase the contact area between the busbar component 70 and the first electrode terminal 30, and between the busbar component 70 and the first adapter 40, thereby increasing the flow area, which is beneficial to improving the flow capacity.

[0216] In some embodiments, reference Fig.11 The busbar component 70 includes a busbar body 71 and a weak portion 72 . The thickness of the weak portion 72 is smaller than that of the busbar body 71 . The weak portion 72 , the first electrode terminal 30 , and the first adapter 40 are welded.

[0217] Along the thickness direction X, the weak portion 72 may cover the hole wall of the first through hole 31 close to the confluence component 70 . In the same plane perpendicular to the thickness direction X, the orthographic projection of the hole wall of the first through hole 31 close to the confluence component 70 is located within the orthographic projection of the weak portion 72 .

[0218] Optionally, along the thickness direction X, the weak portion 72 may cover the hole wall of the first hole segment 311 .

[0219] Optionally, a concave portion may be formed on a side of the conduit component 70 facing away from the wall portion 23 , and a portion of the conduit component 70 corresponding to the concave portion along the thickness direction X may form a weak portion 72 .

[0220] In some examples, the conduit body 71 is disposed around the weak portion 72, and the shape of the weak portion 72 may be adapted to the shape of the first through hole 31. Along the thickness direction X of the wall portion 23, the weak portion 72 may cover the entire first through hole 31.

[0221] In some other examples, the weak portion 72 may also be an annular structure, and the weak portion 72 surrounds a portion of the conduit body 71 .

[0222] During welding, welding heat can penetrate the weak portion 72 and heat the outer peripheral surface of the portion of the first adapter 40 accommodated in the first through hole 31 and the hole wall of the first through hole 31, thereby welding the weak portion 72, the first adapter 40 and the first electrode terminal 30. Since the thickness of the weak portion 72 is relatively thin, the heat penetration efficiency can be improved, thereby reducing the welding power, reducing the welding heat generation, and improving the welding effect.

[0223] In some embodiments, reference Figure 3 and Figure 4 The electrode assembly 10 further 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 further includes a second adapter 80 and a second electrode terminal 90 , and the second adapter 80 is connected to the second pole tab 13 and the second electrode terminal 90 .

[0224] In some examples, the first pole tab 12 is a positive pole tab, and the second pole tab 13 is a negative pole tab. The first electrode terminal 30 and the first adapter 40 can both be an integrally formed structure having a single base metal, and the base metal of the first electrode terminal 30 and the base metal of the first adapter 40 can be the same material as the first pole tab 12. At least one of the second adapter 80 and the second electrode terminal 90 can include two parts with different base metals, so that the second adapter 80 can be welded to the second pole tab 13, and the second electrode terminal 90 can be welded to the busbar component.

[0225] In other examples, the first pole tab 12 is a negative pole tab, and the second pole tab 13 is a positive pole tab. At least one of the first electrode terminal 30 and the first adapter 40 may include two parts with different base metals, so that the first adapter 40 is welded to the first pole tab 12, and the first electrode terminal 30 is welded to the busbar. The second adapter 80 and the second electrode terminal 90 may both be an integrally formed structure with a single base metal, and the base metal of the second adapter 80 and the base metal of the second electrode terminal 90 may be the same material as the second pole tab 13.

[0226] 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.

[0227] The end cover 22 may be connected to the housing 21 by welding, clamping, bonding or other suitable methods.

[0228] The shell 21 and the end cover 22 are separate structures. 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 with the first electrode terminal 30 installed can be covered on the opening 211, and a part of the first adapter 40 can be accommodated in the first through hole 31 of the first electrode terminal 30, and then the first electrode terminal 30 and the first adapter 40 can be welded, which is conducive to simplifying the assembly operation and reducing the difficulty of assembly.

[0229] According to the second aspect of the present application, the embodiment of the present application further provides a battery device 2, Fig.12 is a partial structural schematic diagram of a battery device provided in some embodiments of the present application, referring to Figure 2 and Fig.12 The battery device 2 includes a battery cell 6 provided according to any embodiment of the first aspect of the present application.

[0230] 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.

[0231] 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 seal 50 and a fixing member 61. The shell 20 includes a shell 21 and an end cover 22, and the end cover 22 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 is arranged on the side of the wall 23 facing away from the main body 11, and the first electrode terminal 30 is provided with a first through hole 31, and the first through hole 31 passes through the first electrode terminal 30 along the thickness direction X of the end cover 22. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 31 is located within the orthographic projection of the electrode lead-out hole 231. The fixing member 61 includes a stopper 611 and a fixing member 612 connected to each other. The stopper 611 is located on the side of the end cover 22 away from the main body 11. Along the thickness direction X, a portion of the first electrode terminal 30 is located between the stopper 611 and the end cover 22, and the fixing member 612 is connected to the end cover 22. The first adapter 40 is connected to the first electrode tab 12, and the first adapter 40 is partially accommodated in the first through hole 31 and is butt welded to the first electrode terminal 30. Along the thickness direction X, the sealing member 50 partially abuts between the first electrode terminal 30 and the end cover 22, and partially abuts between the first electrode terminal 30 and the first adapter 40.

[0232] The battery cell 6 further includes a busbar component 70 . The busbar component 70 is located on a side of the first electrode terminal 30 away from the wall portion 23 . The busbar component 70 is welded to the first adapter 40 and the first electrode terminal 30 .

[0233] 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, at least partially disposed on a side of the wall portion facing away from the main body portion, the first electrode terminal being provided with a first through hole, the first through hole penetrating the first electrode terminal along a thickness direction of the wall portion, and an orthographic projection of the first through hole being located within an orthographic projection of the electrode lead-out hole in a same plane perpendicular to the thickness direction; a fixing member, comprising a limiting portion and a fixing portion connected to each other, wherein the limiting portion is located at a side of the wall portion away from the main body portion, a portion of the first electrode terminal is located between the limiting portion and the wall portion along the thickness direction, and the fixing portion is connected to the wall portion; A first adapter connected to the first electrode tab, wherein the first adapter is partially accommodated in the first through hole and welded to the first electrode terminal; as well as A sealing member, along the thickness direction, the sealing member partially abuts between the first electrode terminal and the wall portion, and partially abuts between the first electrode terminal and the first adapter.

2. The battery cell according to claim 1, characterized in that: The first adapter comprises an adapter body, a first convex portion and a second convex portion, the adapter body is arranged on a side of the wall portion facing the main body portion and connected to the first tab, the first convex portion protrudes from a surface of the adapter body facing the wall portion, and the second convex portion is arranged on a side of the adapter body facing the first convex portion and protrudes from an outer peripheral surface of the first convex portion; The first electrode terminal is arranged around the first protrusion and welded to the outer periphery of the first protrusion. Along the thickness direction, at least part of the first electrode terminal is arranged on the side of the second protrusion away from the adapter body, and the sealing member partially abuts between the second protrusion and the first electrode terminal.

3. The battery cell according to claim 2, characterized in that: The first convex portion includes a first sub-portion and a second sub-portion connected to each other, along the thickness direction, at least a portion of the first sub-portion is arranged on a side of the second sub-portion facing away from the main body portion, and the second sub-portion, the second convex portion and the adapter body are integrally formed; The first sub-portion and the second sub-portion have different base metals, and the first electrode terminal surrounds the first sub-portion and is welded to the first sub-portion.

4. The battery cell according to claim 3, characterized in that: Along the direction from the main body portion to the wall portion, the second sub-portion exceeds a surface of the second protrusion facing away from the adapter body.

5. The battery cell according to claim 3, characterized in that: The first electrode terminal comprises a first terminal portion and a second terminal portion connected to each other, and along the thickness direction, at least a portion of the first terminal portion is located on a side of the second terminal portion facing away from the main body portion; The base metals of the first terminal portion and the second terminal portion are different, the base metals of the first terminal portion and the first sub-portion are the same, and the first terminal portion surrounds the first sub-portion and is welded to the first sub-portion; The sealing member partially abuts between the second terminal portion and the second protrusion.

6. The battery cell according to claim 5, characterized in that: Along the thickness direction, the first terminal portion and the second terminal portion are stacked, the first sub-portion and the second sub-portion are stacked, and a first interface between the first terminal portion and the second terminal portion is flush with a second interface between the first sub-portion and the second sub-portion.

7. The battery cell according to any one of claims 3 to 6, characterized in that: The base metal of the first sub-section is aluminum, and the base metal of the second sub-section is copper.

8. The battery cell according to any one of claims 2 to 6, characterized in that: The first convex portion is a solid structure.

9. The battery cell according to any one of claims 2 to 6, characterized in that: Along the direction from the main body to the wall, a surface of the first protrusion facing away from the main body exceeds the first electrode terminal.

10. The battery cell according to any one of claims 1 to 6, characterized in that: The sealing member includes a first sealing portion and a second sealing portion that are integrally formed. Along the thickness direction, the first sealing portion abuts between the first electrode terminal and the first adapter, and the second sealing portion is at least partially arranged on a side of the wall portion away from the main body portion, and abuts between the first electrode terminal and the wall portion.

11. The battery cell according to claim 10, characterized in that: At least a portion of the first adapter is accommodated in the electrode lead-out hole; The sealing member includes a first positioning portion, which is connected to the first sealing member and / or the second sealing member and protrudes from a surface of the second sealing member facing the wall portion, and the first positioning portion is at least partially accommodated in the electrode lead-out hole and is located between the hole wall of the electrode lead-out hole and the outer peripheral surface of the first adapter.

12. The battery cell according to claim 10, characterized in that: The sealing member includes a second positioning portion, which is connected to the first sealing member and protrudes from a surface of the first sealing member facing the first electrode terminal, and the second positioning portion is at least partially located between the hole wall of the first through hole and the outer peripheral surface of the first adapter.

13. The battery cell according to claim 1, characterized in that: The first electrode terminal comprises a first terminal portion and a second terminal portion connected to each other, the first terminal portion and the second terminal portion are made of different base metals, and along the thickness direction of the wall portion, at least a portion of the first terminal portion is located on a side of the second terminal portion that is away from the main body portion; The first transition piece is welded to the first terminal portion or the second terminal portion, and along the thickness direction, the sealing piece partially abuts between the second terminal portion and the wall portion, and partially abuts between the second terminal portion and the first transition piece.

14. The battery cell according to claim 5, 6 or 13, characterized in that: A portion of the first terminal portion and a portion of the second terminal portion are located between the limiting portion and the wall portion.

15. The battery cell according to claim 5, 6 or 13, characterized in that: The base metal of the first terminal portion is aluminum, and the base metal of the second terminal portion is copper.

16. The battery cell according to any one of claims 1 to 6, characterized in that: The battery cell further includes a busbar component, at least a portion of which is located on a side of the first electrode terminal away from the wall portion; The current collecting member is welded to at least one of the first adapter and the first electrode terminal.

17. The battery cell according to claim 16, characterized in that: The busbar component, the first adapter, and the first electrode terminal are welded.

18. The battery cell according to claim 16, characterized in that: The converging component is disposed around the first adapter and is welded to the outer periphery of the first adapter.

19. The battery cell according to claim 16, characterized in that: A surface of the busbar member facing the wall portion abuts against the first electrode terminal and the first adapter.

20. The battery cell according to claim 19, characterized in that: The busbar component includes a busbar body and a weak portion, the thickness of the weak portion is smaller than the thickness of the busbar body, and the weak portion, the first electrode terminal and the first transition piece are welded.

21. The battery cell according to any one of claims 1 to 6, characterized in that: The electrode assembly further 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 adapter and a second electrode terminal, wherein the second adapter is connected to the second electrode tab and the second electrode terminal.

22. 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.

23. A battery device, characterized in that: The invention comprises a plurality of battery cells according to any one of claims 1 to 22.

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

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