Battery cell, battery device and electrical equipment

Abstract

The present application discloses a battery cell, a battery device, and an electrical device. The battery cell includes a housing, an electrode assembly, a first electrode terminal, and a first adapter. The housing includes a wall portion, and the wall portion is provided with an electrode lead-out hole. The electrode assembly is accommodated in the housing, and the electrode assembly includes a main body portion and a first tab. The first electrode terminal includes a first terminal portion and a second terminal portion that are connected to each other and have different base metals. The first terminal portion is provided with a first through hole, and the first through hole penetrates the first terminal portion in the thickness direction of the wall portion. The second terminal portion is provided on a side of the wall portion facing away from the main body portion and is used to connect to a bus bar component. The second terminal portion is disposed along the outer periphery of a part of the first terminal portion and is stacked with another part of the first terminal portion in the thickness direction. The first adapter is connected to the first tab, the base metal of the first adapter is the same as the base metal of the first terminal portion, and at least a part of the first adapter is accommodated in the first through hole and welded to the first terminal portion.

Description

Technical Field

[0001] This application belongs to the technical field of batteries, and particularly relates to a battery cell, a battery device, and an electrical device. Background Art

[0002] Batteries are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc.

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

[0004] Embodiments of this application provide a battery cell, a battery device, and an electrical device, which are conducive to improving the reliability of the battery cell.

[0005] According to the first aspect of this application, this application provides a battery cell, which includes a housing, an electrode assembly, a first electrode terminal, and a first adapter. The housing includes a wall portion, and the wall portion is provided with an electrode lead-out hole. The electrode assembly is accommodated in the housing, and the electrode assembly includes a main body portion and a first tab led out from the main body portion. The first electrode terminal includes a first terminal portion and a second terminal portion connected to each other. The base metals of the first terminal portion and the second terminal portion are different. At least part of the first terminal portion is disposed in the electrode lead-out hole. The first terminal portion is provided with a first through hole, and the first through hole penetrates the first terminal portion along the thickness direction of the wall portion. The second terminal portion is disposed on the side of the wall portion facing away from the main body portion and is used for connecting to a bus bar component. The second terminal portion is disposed along the outer periphery of a part of the first terminal portion and is stacked with another part of the first terminal portion in the thickness direction. The first adapter is connected to the first tab, the base metal of the first adapter is the same as the base metal of the first terminal portion, and at least part of the first adapter is accommodated in the first through hole and welded to the first terminal portion.

[0006] During assembly, the first tab can be first connected to the first adapter and the first tab can be bent; then the whole formed by the electrode assembly and the first adapter is installed in the housing; then the wall part is assembled to the housing, and finally the first adapter and the first terminal part are welded. Specifically, the part of the first adapter received in the first through hole and the first terminal part can be heated from the outside of the first terminal part facing away from the main body part by laser or other means, so as to butt-weld the first terminal part and the first adapter, which can reduce the possibility of welding particles generated during the welding process falling to the side of the first adapter facing the electrode assembly, reduce the risk of internal short circuit of the battery cell, and is beneficial to improving the reliability of the battery cell. Moreover, the first tab and the first adapter are first inserted into the housing, and then the first adapter and the first terminal part are welded. On the one hand, it can also shorten the length of the first tab drawn out from the main body part, save the space required for bending the first tab, and is beneficial to improving the energy density of the battery cell; on the other hand, the first tab and the first adapter are in a natural state, which can reduce the external force pulling and reduce the risk of cracking of the first tab.

[0007] In some embodiments, the first terminal part includes a first terminal body and a first limiting part. The first through hole is provided in the first terminal body and penetrates the first terminal body in the thickness direction. The first adapter is welded to the first terminal body. The first limiting part is connected to the first terminal body and protrudes from the outer peripheral surface of the first terminal body. The first limiting part is located on the side of the wall part facing away from the main body part; the second terminal part is stacked with the first limiting part and is connected to the side of the first limiting part facing away from the wall part; along the direction from the main body part to the wall part, the first terminal body extends beyond the surface of the first limiting part facing away from the wall part, and the second terminal part is located on the outer periphery of the part where the first terminal body extends beyond the first limiting part. In the thickness direction, there is no thickness overlap between the second terminal part and the wall part, which can increase the distance between the surface of the second terminal part facing away from the wall part and the wall part. After the second terminal part is connected to the busbar component, the second terminal part can support the busbar component by a certain height in the thickness direction to increase the distance between the busbar component and the wall part, which is beneficial to reducing the risk of overlap between the busbar component and the wall part.

[0008] In some embodiments, the second terminal part is connected to the first terminal body. The second terminal part is connected to both the first limiting part and the first terminal body at the same time. There are at least two connection surfaces between the second terminal part and the first terminal part, which is beneficial to increasing the connection area and current-carrying area between the two, enhancing the connection strength and connection stability between the two, and improving the current-carrying capacity.

[0009] In some embodiments, the second terminal part is provided with a second through hole. The second through hole penetrates the second terminal part in the thickness direction of the wall part. A part of the first terminal body is received in the second through hole and is connected to at least part of the hole wall of the second through hole. Thereby, the connection area and current-carrying area between the first terminal body and the second terminal part can be further increased, which is beneficial to further enhancing the connection strength and connection stability between the two and improving the current-carrying capacity.

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

[0011] In some embodiments, the cross-section of the second through hole perpendicular to the thickness direction is circular, and along the direction from the wall portion to the main body portion, the hole wall of the second through hole inclines inwards along the radial direction of the second through hole. The first terminal body can not only generate a force on the second terminal portion along the thickness direction towards the first limiting portion, which is beneficial to the second terminal portion pressing against the first limiting portion along the thickness direction, but also the first terminal body can generate a force on the second terminal portion along the radial direction of the second through hole outwards, which is beneficial to the first terminal body pressing against the second terminal portion along the radial direction of the second through hole, and improving the overall connection strength and connection stability between the first terminal portion and the second terminal portion.

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

[0013] In some embodiments, at least part of the first terminal body is received in the electrode lead-out hole; the first electrode terminal further includes a second limiting portion protruding from the outer peripheral surface of the first terminal body. Along the thickness direction of the wall portion, a part of the wall portion is located between the first limiting portion and the second limiting portion. At least part of the first limiting portion and at least part of the second limiting portion are respectively arranged on both sides of the wall portion along the thickness direction, which can limit the first terminal portion in the thickness direction and reduce the risk of the first terminal portion falling into the inside or outside of the housing.

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

[0015] In some embodiments, the portion of the first tab located between the second limiting portion and the first adapter is connected to the second limiting portion. The portion of the first tab located between the second limiting portion and the first adapter may be in contact with the second limiting portion, thereby being electrically connected to the second limiting portion. An overcurrent path may be formed between the first tab and the first terminal portion, and part of the current may be directly transmitted between the first tab and the first terminal portion, which is beneficial to improving the overcurrent capacity of the battery cell.

[0016] In some embodiments, the first tab includes a converging section, a bending section, and an extending section. The converging section is located on the side of the first adapter facing the main body portion and is connected to the main body portion. The bending section is located on one side of the first adapter along the width direction of the wall portion. The bending section is connected between the converging section and the extending section. The extending section extends from the bending section to the space between the second limiting portion and the first adapter. The extending section is welded to the first adapter and is attached to the surface of the second limiting portion facing the main body portion. The bending section and the first adapter may share at least part of the space in the thickness direction, which is beneficial to improving the space utilization rate. Moreover, the first tab only needs to be bent once, and there is no need to reserve a large bending space between the first adapter and the main body portion for the first tab, which is beneficial to improving the space utilization rate inside the housing and enhancing the energy density of the battery cell.

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

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

[0019] In some embodiments, the first adapter includes a first adapter body and a first protrusion. The first adapter body is disposed on the side of the wall portion facing the main body portion and is connected to the first tab. The first protrusion protrudes from the surface of the first adapter body facing the wall portion, and at least a part of the first protrusion is received in the first through hole and welded to the first terminal portion. Thereby, it is beneficial to shorten the length of the first tab led out from the main body portion and facilitate the connection between the first adapter body and the first tab. The first protrusion protrudes from the first adapter body, which can enhance the overall structural strength of the first adapter and reduce the risk of deformation during the welding process.

[0020] In some embodiments, the first protrusion has a solid structure. Thereby, the current-carrying area of the first protrusion can be increased, the anti-deformation ability of the first protrusion itself can be improved, and it is beneficial to improve the current-carrying capacity and overall strength of the first adapter.

[0021] In some embodiments, along the thickness direction of the wall portion, a part of the first tab is located between the first terminal portion and the first adapter body and is connected to the first adapter body. Thereby, the gap between the first adapter body and the first terminal portion can be utilized to accommodate a part of the first tab, which is beneficial to saving the space for folding the tab between the first adapter body and the main body portion. Moreover, the possibility that the first tab contacts the first terminal portion to directly form a current-carrying path between the first tab and the first terminal portion can also be increased.

[0022] In some embodiments, the second terminal portion has a third surface facing away from the main body portion in the thickness direction. Along the direction from the main body portion to the wall portion, neither the first terminal portion nor the first adapter exceeds the third surface. When the second terminal portion is connected to the bus bar component, the first terminal portion and the first adapter are not likely to interfere with the bus bar component, which is beneficial to reducing the gap between the second terminal portion and the bus bar component and improving the connection effect therebetween.

[0023] In some embodiments, the first adapter and the first terminal portion are welded to form a first welded portion; the second terminal portion has a third surface facing away from the main body portion in the thickness direction. Along the direction from the main body portion to the wall portion, the first welded portion does not exceed the third surface. When the second terminal portion is connected to the bus bar component, the first welded portion is not likely to interfere with the bus bar component, which is beneficial to reducing the gap between the second terminal portion and the bus bar component and improving the connection effect therebetween.

[0024] In some embodiments, the electrode assembly includes a second tab led out from the main body portion, and the polarity of the second tab is opposite to that of the first tab; the battery cell further includes a second electrode terminal and a second adapter, and the second adapter connects the second tab and the second electrode terminal; the base metal of the second electrode terminal is the same as the base metal of the second terminal portion. The second terminal portion of one battery cell and the second electrode terminal of another battery cell can be welded to the same bus bar component, which is beneficial to realizing the series connection between the two battery cells and reducing the connection difficulty.

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

[0026] In some embodiments, the base metals of the first terminal portion and the first adapter are both copper; the base metal of the second terminal portion is aluminum. Thus, it is convenient to weld between the first adapter and the first tab, between the first terminal portion and the first adapter, between the second terminal portion and the current collecting component, and between the current collecting component and the positive electrode of another battery cell.

[0027] In some embodiments, the first terminal portion and the second terminal portion are connected by at least one of cold rolling, hot rolling, explosive cladding method, and explosive rolling method. Thus, it is beneficial to improve the connection strength and stability between the first terminal portion and the second terminal portion, and reduce the risk of the connection surfaces of the first terminal portion and the second terminal portion separating from each other.

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

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

[0030] In some embodiments, the electrode assembly includes a second tab led out from the main body portion, and the second tab has a polarity opposite to that of the first tab; the battery cell further includes a second electrode terminal, the second electrode terminal is electrically connected to the second tab, and the base metals of the second electrode terminal, the second terminal portion and the metal base of the current collecting component are the same; there are multiple battery cells; the current collecting component is welded to at least the second terminal portion of one battery cell and the second electrode terminal of another battery cell. The second terminal portion of one battery cell and the second electrode terminal of another battery cell can be welded to the same current collecting component, which is beneficial to realizing the series connection between two battery cells and reducing the connection difficulty.

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

[0032] According to a third aspect of the present application, embodiments of the present application provide an electrical equipment, which includes the battery device provided in any one of the embodiments of the second aspect of the present application, and the battery device is used to provide electric energy. Description of the Drawings

[0033] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. Obviously, the following described drawings are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

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

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

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

[0037] Figure 4 is Figure 3 a cross-sectional schematic diagram of the battery cell shown.

[0038] Figure 5 is Figure 4 an enlarged structural diagram of area A in.

[0039] Figure 6 is Figure 5 an exploded view of a partial structure in.

[0040] Figure 7 is along Figure 4 a cross-sectional schematic diagram taken along direction B-B in.

[0041] Figure 8 is Figure 7 an enlarged structural diagram of area C in.

[0042] Figure 9 is a schematic structural diagram of an electrode assembly of a battery cell provided in some embodiments of the present application.

[0043] Figure 10 is Figure 9 an enlarged structural diagram of area D in.

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

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

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

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

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

[0049] In the attached figure:

[0050] Vehicle 1, battery device 2, controller 3, motor 4;

[0051] Box body 5, first box body part 5a, second box body part 5b, accommodating space 5c;

[0052] Electrode assembly 10, main body 11, first pole ear 12, folded section 121, bent section 122, extended section 123, second pole ear 13, shell 20, shell 21, opening 211, end cover 22, wall 23, electrode lead hole 231, first electrode terminal 30, first terminal portion 31, first through hole 311, first terminal body 312, second surface 312a, first limiting portion 313, second limiting portion 314, second terminal portion 32, second through hole 321, first end 3 21a, second end 321b, hole wall 321c, second terminal body 322, step portion 323, step surface 323a, third surface 32a, first adapter 40, first adapter body 41, first protrusion 42, first surface 42a, fixing member 51, first fixing portion 511, second fixing portion 512, insulating member 52, second electrode terminal 60, second adapter 70, busbar component 80, first welding portion W1, second welding portion W2, thickness direction X, width direction Y. DETAILED DESCRIPTION

[0053] 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.

[0054] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs; 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" and any variations thereof in the specification and claims of this application and the above drawings are intended to cover non-exclusive inclusion. The terms "first", "second", etc. in the specification and claims of this application or the above drawings are used to distinguish different objects and not to describe a specific order or primary-secondary relationship.

[0055] Reference to "embodiment" in this application means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase may not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments.

[0056] In the description of this application, it should be noted that, unless otherwise clearly specified and defined, the terms "installed", "connected", "coupled", "attached" shall be construed broadly. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a direct connection, or an indirect connection through an intermediate medium, and it may be the internal communication of two components. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0057] The term "and / or" in this application is merely 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 simultaneously, and B exists alone. In addition, the character " / " in this application generally represents an "or" relationship between the associated objects before and after.

[0058] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, in different embodiments, the detailed description of the same components is omitted. It should be understood that the thickness, length, width, etc. of various components in the embodiments of this application shown in the drawings, as well as the overall thickness, length, width, etc. of the integrated device, are only for illustrative purposes and should not constitute any limitation to this application.

[0059] The term "plurality" as used in this application refers to two or more (including two).

[0060] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism but also the case of approximately parallelism as conventionally recognized in engineering; at the same time, "perpendicular" also includes not only the case of absolute perpendicularity but also the case of approximately perpendicularity as conventionally recognized in engineering.

[0061] 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.

[0062] 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.

[0063] 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.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] In some embodiments, a separator is disposed between the positive electrode and the negative electrode.

[0068] 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.

[0069] 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.

[0070] 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.

[0071] In some embodiments, the electrode assembly is a laminate structure.

[0072] 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, parallel, or in a hybrid connection through a busbar component.

[0073] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells.

[0074] The battery device generally includes a box body for encapsulating one or more battery cells. The box body can prevent liquids or other foreign objects from affecting the charging or discharging of the battery cells.

[0075] As an example, the battery cell assembly can be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells into an independent module. As an example, the battery module can be formed by bundling a plurality of battery cells with cable ties. The battery cell assembly can be accommodated in the box body by fixing the battery module in the box body. As an example, the box body can 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 body to accommodate the battery cell assembly.

[0076] In some embodiments, the box body can be part of the chassis structure of a vehicle. For example, part of the box body can become at least part of the floor of the vehicle, or part of the box body can become at least part of the cross beam and longitudinal beam of the vehicle.

[0077] In some embodiments, the battery device can be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0078] The electrode assembly generally includes a main body portion and a tab extending from the main body portion. The tab is usually connected to the electrode terminal through an adapter. In the related art, the tab can be first welded to the adapter, and then the adapter is welded to the electrode terminal from one side of the adapter, and then the adapter, the electrode terminal, and the electrode assembly are installed into the housing. However, the welding particles generated during the welding process may remain on the adapter and then enter the interior of the housing, which may cause an internal short circuit inside the battery cell, thereby affecting the reliability of the battery cell.

[0079] In view of this, the embodiments of the present application provide a technical solution. By setting the first electrode terminal to include a first terminal portion and a second terminal portion with different base metals, and arranging at least part of the first adapter in the first through hole of the first terminal portion and welding it to the first terminal portion, the electrode assembly and the first adapter can be first installed into the housing, and then the first terminal portion and the first adapter can be seam welded from the outside of the first terminal portion facing away from the electrode assembly by laser or other suitable means, which can reduce the possibility of the welding particles generated during the welding process falling into the inner side of the first adapter facing the electrode assembly, reduce the risk of internal short circuit of the battery cell, and is beneficial to improving the reliability of the battery cell.

[0080] The technical solutions provided by the embodiments of the present application are applicable to battery cells, battery devices, and electrical equipment using battery devices.

[0081] The battery device disclosed in the embodiments of the present application can be used in electrical equipment using the battery device as a power source or various energy storage systems using the battery device as an energy storage element. The electrical equipment can be, but is not limited to, mobile phones, tablets, laptop computers, electric toys, power tools, battery cars, electric vehicles, ships, spacecraft, and the like. Among them, the electric toy can include fixed or mobile electric toys, such as game consoles, electric vehicle toys, electric ship toys, and electric aircraft toys, etc. The spacecraft can include airplanes, rockets, space shuttles, and spaceships, etc.

[0082] For the convenience of description, the following embodiments will be described by taking the electrical equipment as a vehicle as an example.

[0083] Figure 1 is a schematic structural diagram of a vehicle provided by some embodiments of the present application. Refer to Figure 1 , the vehicle 1 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can 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 can be provided at the bottom, head, or tail of the vehicle 1. The battery device 2 can be used to supply power to the vehicle 1. For example, the battery device 2 can be used as the operating power source of the vehicle 1. The vehicle 1 can also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4. For example, it is used for the working power requirements during the start, navigation, and driving of the vehicle 1.

[0084] In some embodiments of the present application, the battery device 2 can not only be used as the operating power source of the vehicle 1, but also be used as the driving power source of the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0085] Figure 2 is an exploded structural diagram of a battery device provided by some embodiments of the present application. Refer to Figure 2, the battery device 2 includes a box body 5 and battery cells 6, and the battery cells 6 are accommodated in the box body 5. Among them, the box body 5 is used to provide an accommodation space for the battery cells 6, and the box body 5 can adopt various 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 are covered with each other, and the first box body part 5a and the second box body part 5b jointly define an accommodation space 5c for accommodating the battery cells 6. The second box body part 5b may be a hollow structure with one end open, and the first box body part 5a may be a plate-like structure. The first box body part 5a is covered on 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 accommodation space 5c; the first box body part 5a and the second box body part 5b may also both be hollow structures with one side open, and the open side of the first box body part 5a is covered on 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 of various shapes, such as a cylinder, a cuboid, etc.

[0086] To improve the sealing performance after the connection between the first box body part 5a and the second box body part 5b, a sealing member, such as sealant, sealing ring, etc., may also be provided between the first box body part 5a and the second box body part 5b.

[0087] Assume that the first box body part 5a is covered on the top of the second box body part 5b. The first box body part 5a can also be called the upper box cover, and the second box body part 5b can also be called the lower box body.

[0088] In the battery device 2, there may be multiple battery cells 6. The multiple battery cells 6 can be connected in series, in parallel, or in a hybrid connection. A hybrid connection means that there are both series and parallel connections among the multiple battery cells 6. The multiple battery cells 6 can be directly connected in series, in parallel, or in a hybrid connection together, and then the whole formed by the multiple battery cells 6 is accommodated in the box body 5; of course, in the battery device 2, multiple battery cells 6 can also be first connected in series, in parallel, or in a hybrid connection to form a battery module form, and then multiple battery modules are connected in series, in parallel, or in a hybrid connection to form a whole and are accommodated in the box body 5. The battery device 2 may also include other structures. For example, the battery device 2 may further include a busbar component for realizing the electrical connection among the multiple battery cells 6.

[0089] Exemplarily, the battery cell 6 can be the smallest unit constituting the battery device 2.

[0090] Figure 3 is a schematic exploded view of the battery cell provided in some embodiments of the present application. Refer to 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.

[0091] The outer casing 20 is used to encapsulate components such as the electrode assembly 10 and the electrolyte. The outer casing 20 can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum plastic film, etc.

[0092] In some embodiments, the outer casing 20 is a hollow structure, and an accommodation space for accommodating the electrode assembly 10 and the electrolyte is formed inside it. The shape of the outer casing 20 can be determined according to the specific shape of the electrode assembly 10. For example, if the electrode assembly 10 is a cuboid structure, a cuboid outer casing can be selected.

[0093] The material of the outer casing 20 can be various. For example, the material of the outer casing 20 can be metal or plastic. Optionally, the material of the outer casing 20 can be copper, iron, aluminum, steel, aluminum alloy, etc. Exemplarily, the outer casing 20 can be a steel casing, an aluminum casing, a plastic casing (such as polypropylene), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum plastic film, etc.

[0094] As an example, the outer casing 20 includes a housing 21 and an end cap 22. The housing 21 has an opening 211, and the end cap 22 is used to cover the opening 211.

[0095] The housing 21 is a component used to cooperate with the end cap 22 to form the internal cavity of the battery cell 6. The formed internal cavity can be used to accommodate the electrode assembly 10, the electrolyte, and other components.

[0096] The housing 21 and the end cap 22 can be independent components. Exemplarily, an opening 211 can be provided on the housing 21, and the end cap 22 is covered at the opening 211 to form the internal cavity of the battery cell 6.

[0097] The shape of the end cap 22 can be adapted to the shape of the housing 21 to cooperate with the housing 21. The material of the end cap 22 can be the same as or different from the material of the housing 21.

[0098] The end cap 22 can be connected to the housing 21 by welding, bonding, clamping, or other means.

[0099] The housing 21 can have an opening 211 at one end or openings 211 at both ends. Exemplarily, the housing 21 is a structure with an opening 211 on one side, and one end cap 22 is provided and covers the opening 211 of the housing 21. As another example, the housing 21 can also be a structure with openings 211 on both sides, and two end caps 22 are provided, and the two end caps 22 respectively cover the two openings 211 of the housing 21.

[0100] Figure 4 is Figure 3 a schematic cross-sectional view of the battery cell shown, Figure 5 is Figure 4 an enlarged schematic structural view of area A in Figure 6 is Figure 5Exploded view of the local structure in Figure 7 is a schematic cross-sectional view taken along Figure 4 direction B-B in Figure 8 and is Figure 7 a schematic enlarged view of region C in Figure 9 a schematic structural view of the electrode assembly of the battery cell provided in some embodiments of the present application, Figure 10 and is Figure 9 a schematic enlarged view of region D in Figure 11 a schematic cross-sectional view of the local structure of the battery cell provided in some other embodiments of the present application, Figure 12 and is Figure 11 a schematic enlarged view of region E in Figure 13 and is Figure 4 a schematic enlarged view of region F in Figure 14 a schematic cross-sectional view of the local structure of the battery cell provided in some other embodiments of the present application.

[0101] Referring to Figures 3 to 14 , embodiments of the present application provide a battery cell 6, which includes an electrode assembly 10, a housing 20, a first electrode terminal 30, and a first adapter 40. 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 portion 11 and a first tab 12 led out from the main body portion 11. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 connected to each other, and the base metals of the first terminal portion 31 and the second terminal portion 32 are different. At least a part of the first terminal portion 31 is disposed in the electrode lead-out hole 231. The first terminal portion 31 is provided with a first through hole 311, and the first through hole 311 penetrates the first terminal portion 31 along the thickness direction X of the wall portion 23. The second terminal portion 32 is disposed on a side of the wall portion 23 facing away from the main body portion 11 and is used for connecting to a busbar component. The second terminal portion 32 is disposed along the outer circumference of a part of the first terminal portion 31 and is stacked with another part of the first terminal portion 31 along the thickness direction X. The first adapter 40 is connected to the first tab 12, the base metal of the first adapter 40 is the same as that of the first terminal portion 31, and at least a part of the first adapter 40 is accommodated in the first through hole 311 and welded to the first terminal portion 31.

[0102] The wall portion 23 may be the end cap 22 or one of the shell walls of the housing 21. Optionally, in Figure 3 and Figure 4 the illustrated embodiment, the wall portion 23 is the end cap 22.

[0103] The main body portion 11 is the core part for the electrode assembly 10 to realize the charge and discharge functions. The first tab 12 may be led out from one end of the main body portion 11 close to the wall portion 23 or from other ends of the main body portion 11. Optionally, in Figure 3In the illustrated embodiment, the first tab 12 is led out from one end of the main body 11 close to the wall portion 23, which is conducive to simplifying the structure of the first adapter 40.

[0104] The first tab 12 can be connected to the first adapter 40 by welding, abutting or other suitable means.

[0105] In the embodiment of the present application, the "base metal" refers to the main metal component. The main metal components of the first terminal portion 31 are different from those of the second terminal portion 32, and the main metal components of the first adapter 40 are the same as those of the first terminal portion 31, so as to facilitate welding of the first adapter 40 and the first terminal portion 31.

[0106] Optionally, the first tab 12 is a negative tab. The materials of the first terminal portion 31 and the first adapter 40 can be copper or copper alloy, and the base metals of the first terminal portion 31 and the first adapter 40 are both copper. The material of the second terminal portion 32 can be aluminum or aluminum alloy, and the base metal of the second terminal portion 32 is aluminum.

[0107] The first terminal portion 31 can be partially received in the electrode lead-out hole 231, or can be partially disposed on at least one side of the electrode lead-out hole 231 along the thickness direction X.

[0108] The first terminal portion 31 can be an annular structure surrounding the first through hole 311. Optionally, in the projection plane perpendicular to the thickness direction X, the orthographic projection of the first through hole 311 can be circular, rectangular or other shapes.

[0109] The second terminal portion 32 is entirely disposed on the outer side of the wall portion 23 facing away from the main body 11, which is conducive to connecting with the bus bar component. The second terminal portion 32 can be connected to the bus bar component by welding, bonding or other suitable means.

[0110] Optionally, the base metal of the second terminal portion 32 can be the same as the base metal of the bus bar component, so as to facilitate their connection by welding, which is conducive to improving the connection strength and connection stability.

[0111] The first adapter 40 can be entirely received in the first through hole 311, or only a part of the first adapter 40 can be received in the first through hole 311, and the other part of the first adapter 40 can be disposed, for example, on the side of the wall portion 23 facing the main body 11, so as to facilitate connecting the first tab 12.

[0112] The part of the first adapter 40 received in the first through hole 311 is welded to the first terminal portion 31 to form a first welding portion W1, and the first welding portion W1 is directly connected to the outer peripheral wall of the part of the first adapter 40 received in the first through hole 311 and the hole wall of the first through hole 311.

[0113] Optionally, the first welding portion W1 may be an annular structure to increase the welding area between the first adapter 40 and the first terminal portion 31, improve the welding strength and welding stability therebetween, and enhance the current-carrying capacity. Moreover, the annular first welding portion W1 may also form a seal between the mating interfaces of the first adapter 40 and the first terminal portion 31, which is beneficial to improving the sealing performance of the battery cell 6.

[0114] The first adapter 40 and the first terminal portion 31 may be welded by a butt welding method. Specifically, the outer peripheral wall of the portion of the first adapter 40 received in the first through hole 311 and the hole wall of the first through hole 311 may be heated by laser or other suitable means, so that the portion of the first adapter 40 received in the first through hole 311 and the hole wall portion of the first through hole 311 are partially melted and fused together, and the fused portion forms the first welding portion W1 after solidification.

[0115] Optionally, in the same plane perpendicular to the thickness direction X, the orthographic projection of the second terminal portion 32 and the orthographic projection of the first through hole 311 do not overlap. The second terminal portion 32 does not cover the first through hole 311 along the thickness direction X, which is beneficial to welding the first adapter 40 and the first terminal portion 31. A part of the first welding portion W1 formed by welding the first adapter 40 and the first terminal portion 31 may be exposed on the side of the second terminal portion 32 away from the wall portion 23 along the thickness direction X.

[0116] Exemplarily, the second terminal portion 32 may be provided with a through hole, a through slot or other structures penetrating the second terminal portion 32 along the thickness direction X, and a part of the first welding portion W1 may be exposed on the side of the first electrode terminal 30 away from the electrode assembly 10 along the thickness direction X through the through hole, through slot and other structures of the second terminal portion 32.

[0117] In some examples, the second terminal portion 32 may surround a part of the first terminal portion 31, and the second terminal portion 32 is an annular structure. In other examples, the second terminal portion 32 may also include a plurality of sub-portions arranged at intervals along the outer periphery of a part of the first terminal portion 31.

[0118] During assembly, the first tab 12 can be first connected to the first adapter 40 and the first tab 12 can be bent; then the whole formed by the electrode assembly 10 and the first adapter 40 is installed in the housing 21; then the wall portion 23 is assembled to the housing 21, and finally the first adapter 40 and the first terminal portion 31 are welded. Specifically, the portion of the first adapter 40 received in the first through hole 311 and the first terminal portion 31 can be heated from the outside of the first terminal portion 31 facing away from the main body portion 11 by laser or other means, so as to butt-weld the first terminal portion 31 and the first adapter 40, which can reduce the possibility of welding particles generated during the welding process falling to the side of the first adapter 40 facing the electrode assembly 10, reduce the risk of internal short circuit of the battery cell 6, and is beneficial to improving the reliability of the battery cell 6.

[0119] Moreover, the first tab 12 and the first adapter 40 are first inserted into the housing, and then the first adapter 40 and the first terminal portion 31 are welded. On the one hand, it can also shorten the length of the first tab 12 led out from the main body portion 11, save the space required for bending the first tab 12, and is beneficial to improving the energy density of the battery cell 6; on the other hand, the first tab 12 and the first adapter 40 are in a natural state, which can reduce the external force pulling and reduce the risk of cracking of the first tab 12.

[0120] The second terminal portion 32 is disposed along the outer periphery of a part of the first terminal portion 31. The second terminal portion 32 and the first terminal portion 31 can share a part of the space in the thickness direction X, which can reduce the overall thickness of the first electrode terminal 30 in the thickness direction X, is beneficial to reducing the space occupied by the battery cell 6, and improving the energy density.

[0121] In some embodiments, the battery cell 6 further includes an insulating support member, which is disposed on the main body portion 11 and located between the main body portion 11 and the first adapter 40. The insulating support member can be used to support the first adapter 40 so that a part of the first adapter 40 abuts against the first terminal portion 31, which is beneficial to improving the welding effect between the first adapter 40 and the first terminal portion 31.

[0122] Optionally, the insulating support member can be an insulating film, an insulating bracket or other components that can play an insulating and supporting role.

[0123] In some embodiments, refer to Figure 5 and Figure 11, the first terminal portion 31 includes a first terminal body 312 and a first limiting portion 313. The first through hole 311 is provided in the first terminal body 312 and penetrates the first terminal body 312 along the thickness direction X. The first adapter 40 is welded to the first terminal body 312. The first limiting portion 313 is connected to the first terminal body 312 and protrudes from the outer peripheral surface of the first terminal body 312. The first limiting portion 313 is located on the side of the wall portion 23 facing away from the main body portion 11. The second terminal portion 32 is stacked with the first limiting portion 313 and is connected to the side of the first limiting portion 313 facing away from the wall portion 23. Along the direction from the main body portion 11 to the wall portion 23, the first terminal body 312 extends beyond the surface of the first limiting portion 313 facing away from the wall portion 23, and the second terminal portion 32 is located on the outer periphery of the portion where the first terminal body 312 extends beyond the first limiting portion 313.

[0124] The first terminal body 312 can be a hollow cylindrical structure, and the hollow part inside it forms the first through hole 311. The first terminal body 312 has an outer peripheral surface around its central axis, and the first limiting portion 313 is connected to and protrudes from the outer peripheral surface of the first terminal body 312.

[0125] Optionally, the first limiting portion 313 and the first terminal body 312 can be an integrally formed structure.

[0126] In some examples, referring to Figure 5 , the first terminal body 312 can be inserted into the electrode lead-out hole 231. One end of the first terminal body 312 along the thickness direction X away from the main body portion 11 can extend out of the electrode lead-out hole 231 along the thickness direction X to facilitate connecting the first limiting portion 313. In other examples, referring to Figure 11 , the first terminal body 312 can also be provided on the side of the electrode lead-out hole 231 along the thickness direction X away from the main body portion 11.

[0127] The second terminal portion 32 is provided on the side of the first limiting portion 313 facing away from the wall portion 23 and is stacked and connected with the first limiting portion 313, which can increase the connection area between the first terminal portion 31 and the second terminal portion 32 and improve the connection stability between the two.

[0128] The surface of the second terminal portion 32 facing the wall portion 23 can be attached to and connected with the surface of the first limiting portion 313 facing away from the wall portion 23. Along the direction from the main body portion 11 to the wall portion 23, the first terminal body 312 can extend beyond the surface of the second terminal portion 32 facing the wall portion 23. The second terminal portion 32 is located on the outer periphery of the portion where the first terminal body 312 extends beyond the first limiting portion 313.

[0129] The second terminal portion 32 can be directly connected to the first terminal body 312 or can be not connected to the first terminal body 312.

[0130] In the thickness direction X, the entire second terminal portion 32 is located on the side of the first limiting portion 313 away from the wall portion 23. In the thickness direction X, there is no thickness overlap between the second terminal portion 32 and the wall portion 23, which can increase the distance between the surface of the second terminal portion 32 facing away from the wall portion 23 and the wall portion 23. After the second terminal portion 32 is connected to the bus bar component, the second terminal portion 32 can support the bus bar component to a certain height in the thickness direction X, so as to increase the distance between the bus bar component and the wall portion 23, which is beneficial to reducing the risk of overlap between the bus bar component and the wall portion 23.

[0131] In some embodiments, referring to Figure 5 , Figure 6 and Figure 11 , the second terminal portion 32 is connected to the first terminal body 312.

[0132] Optionally, the second terminal portion 32 can be disposed around the first terminal body 312, and the inner peripheral surface of the second terminal portion 32 is connected to the outer peripheral surface of the first terminal body 312.

[0133] The outer peripheral surface of the first terminal body 312 can extend in the thickness direction X or can be inclined with respect to the thickness direction X.

[0134] In the direction from the main body portion 11 to the wall portion 23, a part of the first terminal body 312 extends beyond the surface of the first limiting portion 313 facing away from the wall portion 23. The second terminal portion 32 can be disposed along the outer periphery of the part of the first terminal body 312 that extends beyond the first limiting portion 313 and is connected to the part of the first terminal body 312 that extends beyond the first limiting portion 313.

[0135] The second terminal portion 32 is connected to both the first limiting portion 313 and the first terminal body 312. There are at least two connection surfaces between the second terminal portion 32 and the first terminal portion 31, which is beneficial to increasing the connection area and current-carrying area between the two, enhancing the connection strength and connection stability between the two, and improving the current-carrying capacity.

[0136] In some embodiments, referring to Figure 5 , Figure 6 and Figure 11 , the second terminal portion 32 is provided with a second through hole 321. The second through hole 321 penetrates the second terminal portion 32 in the thickness direction X of the wall portion 23. A part of the first terminal body 312 is received in the second through hole 321 and is connected to at least a part of the hole wall 321c of the second through hole 321.

[0137] In the direction from the main body portion 11 to the wall portion 23, the part of the first terminal body 312 that extends beyond the first limiting portion 313 can be received in the second through hole 321 and is connected to at least a part of the hole wall 321c of the second through hole 321.

[0138] Optionally, in the projection plane perpendicular to the thickness direction X, the orthographic projection of the second through hole 321 may be circular, rectangular or other shapes. The outer contour of the portion of the first terminal body 312 received in the second through hole 321 is adapted to the shape of the second through hole 321 to increase the connection area between the first terminal body 312 and the second terminal portion 32.

[0139] The second terminal portion 32 is an annular structure surrounding the second through hole 321. The portion of the first terminal body 312 received in the second through hole 321 can be attached to and connected to the hole wall of the second through hole 321. Thus, the connection area and the current-carrying area between the first terminal body 312 and the second terminal portion 32 can be further increased, which is beneficial to further enhancing the connection strength and connection stability between the two and improving the current-carrying capacity.

[0140] In some embodiments, referring to Figure 6 , along the thickness direction X, the second through hole 321 has a first end 321a close to the first limiting portion 313 and a second end 321b far from the first limiting portion 313. In the same plane perpendicular to the thickness direction X, the orthographic projection of the first end 321a is located within the orthographic projection of the second end 321b, and the orthographic projection range of the second end 321b exceeds the orthographic projection range of the first end 321a.

[0141] In the projection plane perpendicular to the thickness direction X, the orthographic projection area of the first end 321a is smaller than the orthographic projection area of the second end 321b.

[0142] Optionally, along the direction from the second end 321b to the first end 321a, the cross-sectional area of the second through hole 321 may show a gradually decreasing trend. Along the direction from the second end 321b to the first end 321a, the cross-sectional area of the second through hole 321 may gradually decrease evenly or may gradually decrease in a stepped and segmented manner. For example, the hole wall 321c of the second through hole 321 may be inclined with respect to the thickness direction X so that the cross-sectional area of the second through hole 321 gradually decreases evenly along the direction from the second end 321b to the first end 321a. Another example is that at least one step portion may be provided on the hole wall of the second through hole 321, and each step portion has a step surface facing the first limiting portion 313 so that the cross-sectional area of the second through hole 321 gradually decreases in a segmented manner along the direction from the second end 321b to the first end 321a.

[0143] Since a part of the first terminal body 312 is received in the second through hole 321 and connected to the hole wall 321c of the second through hole 321, the shape of the outer peripheral surface of the portion of the first terminal body 312 received in the second through hole 321 may be adapted to the shape of the hole wall 321c of the second through hole 321. Along the direction from the second end 321b to the first end 321a, the circumferential length of the outer peripheral surface of the portion of the first terminal body 312 received in the second through hole 321 shows a gradually decreasing trend.

[0144] In the thickness direction X, a part of the first terminal body 312 can be located on a side of a part of the second terminal portion 32 facing away from the wall portion 23. This part of the first terminal body 312 can limit the position of this part of the second terminal portion 32, so that the second terminal portion 32 presses the first limiting portion 313 along the thickness direction X, which is beneficial to improving the connection strength and connection stability between the first terminal portion 31 and the second terminal portion 32.

[0145] In some embodiments, the cross-section of the second through-hole 321 perpendicular to the thickness direction X is circular. Along the direction from the wall portion 23 to the main body portion 11, the hole wall 321c of the second through-hole 321 inclines inwards along the radial direction of the second through-hole 321.

[0146] The hole wall 321c of the second through-hole 321 can be inclined relative to the thickness direction X. Along the direction from the second end 321b to the first end 321a, the cross-sectional area of the second through-hole 321 gradually and evenly decreases.

[0147] During assembly, pressure can be applied to one end of the first terminal body 312 away from the main body portion 11 by riveting or other means, so that this end portion of the first terminal body 312 expands outwards along the radial direction of the second through-hole 321 and abuts against the hole wall 321c of the second through-hole 321, thereby making the mating interface between the second terminal portion 32 and the first terminal body 312 inclined relative to the thickness direction X.

[0148] The hole wall 321c of the second through-hole 321 inclines inwards along the radial direction of the second through-hole 321. The first terminal body 312 can not only exert a force on the second terminal portion 32 along the thickness direction X towards the first limiting portion 313, which is beneficial to the second terminal portion 32 pressing the first limiting portion 313 along the thickness direction X, but also the first terminal body 312 can exert a force on the second terminal portion 32 along the radial direction of the second through-hole 321 outwards, which is beneficial to the first terminal body 312 pressing the second terminal portion 32 along the radial direction of the second through-hole 321, improving the overall connection strength and connection stability between the first terminal portion 31 and the second terminal portion 32.

[0149] In some embodiments, referring to Figure 5 and Figure 11 , the part of the first adapter 40 received in the first through-hole 311 has a first surface 42a facing away from the main body portion 11, and the first terminal body 312 has a second surface 312a facing away from the main body portion 11. The part of the first adapter 40 received in the first through-hole 311 is welded to the first terminal portion 31 to form a first welding portion W1, and the first welding portion W1 connects the first surface 42a and the second surface 312a.

[0150] A part of the first welding portion W1 is directly connected to the outer peripheral wall of the portion of the first adapter 40 received in the first through hole 311 and the hole wall of the first through hole 311, and another part of the first welding portion W1 is directly connected to the first surface 42a and the second surface 312a, which is beneficial to improving the welding strength between the first adapter 40 and the first terminal body 312.

[0151] The first welding portion W1 connects the first surface 42a and the second surface 312a. Along the thickness direction X, the first surface 42a and the second surface 312a can be flush with each other, which is beneficial to reducing the difficulty of butt welding between the first adapter 40 and the first terminal body 312 and improving the welding effect.

[0152] In some embodiments, at least a part of the first terminal body 312 is received in the electrode lead-out hole 231. The first electrode terminal 30 further includes a second limiting portion 314 protruding from the outer peripheral surface of the first terminal body 312. Along the thickness direction X of the wall portion 23, a part of the wall portion 23 is located between the first limiting portion 313 and the second limiting portion 314.

[0153] The first terminal body 312 can be entirely received in the electrode lead-out hole 231, or only a part of the first terminal body 312 can be received in the electrode lead-out hole 231. The two ends of the first terminal body 312 along the thickness direction X can extend outside the electrode lead-out hole 231.

[0154] The second limiting portion 314 can be connected to one end of the first terminal body 312 along the thickness direction X close to the main body portion 11.

[0155] Optionally, the first terminal body 312, the first limiting portion 313 and the second limiting portion 314 are of an integrally formed structure. At least one of the first limiting portion 313 and the second limiting portion 314 can be formed by riveting.

[0156] Along the thickness direction X, a part of the wall portion 23 is located between the first limiting portion 313 and the second limiting portion 314. At least a part of the first limiting portion 313 and at least a part of the second limiting portion 314 are respectively arranged on both sides of the wall portion 23 along the thickness direction X, which can limit the first terminal portion 31 in the thickness direction X and reduce the risk of the first terminal portion 31 falling inside or outside the housing 20.

[0157] In some embodiments, along the thickness direction X, a part of the first tab 12 is located between the second limiting portion 314 and the first adapter 40.

[0158] At least a part of the second limiting portion 314 is located on the side of the wall portion 23 facing the main body portion 11. The gap between the second limiting portion 314 and the first adapter 40 is relatively small. In the embodiment of the present application, a part of the first tab 12 is disposed between the second limiting portion 314 and the first adapter 40, and it is easier for a part of the first tab 12 to contact the second limiting portion 314, thereby forming an overcurrent path between the first tab 12 and the second limiting portion 314.

[0159] In some embodiments, referring to Figures 7 to 10 , the part of the first tab 12 located between the second limiting portion 314 and the first adapter 40 is connected to the second limiting portion 314.

[0160] The part of the first tab 12 located between the second limiting portion 314 and the first adapter 40 can contact the second limiting portion 314, so as to be electrically connected to the second limiting portion 314. An overcurrent path can be formed between the first tab 12 and the first terminal portion 31, and part of the current can be directly transmitted between the first tab 12 and the first terminal portion 31, which is beneficial to improving the overcurrent capacity of the battery cell 6.

[0161] In some embodiments, referring to Figures 7 to 10 , the first tab 12 includes a converging section 121, a bending section 122 and an extending section 123. The converging section 121 is located on the side of the first adapter 40 facing the main body portion 11 and is connected to the main body portion 11. The bending section 122 is located on one side of the first adapter 40 along the width direction Y of the wall portion 23. The bending section 122 is connected between the converging section 121 and the extending section 123. The extending section 123 extends from the bending section 122 to between the second limiting portion 314 and the first adapter 40. The extending section 123 is welded to the first adapter 40 and is attached to the surface of the second limiting portion 314 facing the main body portion 11.

[0162] The converging section 121 is the part of the first tab 12 for directly connecting to the main body portion 11. The converging section 121 can extend from one end of the main body portion 11 facing the wall portion 23 to one side of the first adapter 40 along the width direction Y of the wall portion 23.

[0163] The bending section 122 is bent relative to the converging section 121 and the extending section 123. Optionally, the bending section 122 can be bent into an arc shape.

[0164] Along the thickness direction X, at least a part of the extending section 123 can be clamped between the first adapter 40 and the second limiting portion 314.

[0165] Optionally, the number of the electrode assemblies 10 may be two, and the two electrode assemblies 10 are stacked along the width direction Y of the wall portion 23. The first tab ears 12 of the two electrode assemblies 10 are both connected to the first adapter 40. The bent segments 122 of the first tab ears 12 of the two electrode assemblies 10 are respectively located on opposite sides of the first adapter 40 along the width direction Y, and the extending segments 123 of the first tab ears 12 of the two electrode assemblies 10 extend towards each other along the width direction Y.

[0166] The extending segment 123 can be welded to the first adapter 40 by laser welding or other suitable means.

[0167] The extending segment 123 is attached to the surface of the second limiting portion 314 facing the main body portion 11, which can increase the contact area between the extending segment 123 and the second limiting portion 314, and further improve the current-carrying capacity.

[0168] The converging segment 121 and the extending segment 123 of the first tab ear 12 are respectively located on opposite sides of the first adapter 40 along the thickness direction X, and the bent segment 122 connecting the converging segment 121 and the extending segment 123 is located on one side of the first adapter 40 along the width direction Y. The bent segment 122 and the first adapter 40 can share at least part of the space in the thickness direction X, which is beneficial to improving the space utilization rate. Moreover, the first tab ear 12 only needs to be bent once, and there is no need to reserve a large bending space for the first tab ear 12 between the first adapter 40 and the main body portion 11, which is beneficial to improving the space utilization rate inside the outer shell 20 and enhancing the energy density of the battery cell 6.

[0169] In some embodiments, referring to Figure 11 and Figure 12 , the battery cell 6 includes a fixing member 51, and at least a part of the fixing member 51 is disposed on the side of the first limiting portion 313 away from the wall portion 23, and the fixing member 51 is connected to the wall portion 23.

[0170] The fixing member 51 may be an annular structure. Exemplarily, the fixing member 51 is a rotary body.

[0171] In some examples, a part of the fixing member 51 may directly abut against the first electrode terminal 30 along the thickness direction X. The wall portion 23 can be electrically connected to the first electrode terminal 30 through the fixing member 51, so that the wall portion 23 is charged. In other examples, an insulating member may also be provided between a part of the fixing member 51 and the first electrode terminal 30 along the thickness direction X. A part of the fixing member 51 can be press-fitted with the first electrode terminal 30 indirectly through the insulating member, and the fixing member 51 can be insulated from the first electrode terminal 30 through the insulating member.

[0172] In some examples, along the thickness direction X, a part of the fixing member 51 can be disposed on a side of the first terminal portion 31 away from the wall portion 23 and surround the second terminal portion 32, and the fixing member 51 can press the first terminal portion 31 toward the wall portion 23. In other examples, along the thickness direction X, a part of the fixing member 51 can be disposed on at least a part of the second terminal portion 32 away from the wall portion 23, and the fixing member 51 can press the second terminal portion 32 and the first terminal portion 31 toward the wall portion 23.

[0173] Optionally, the fixing member 51 can be made of a metal material to improve the connection strength and stability between the fixing member 51 and the wall portion 23.

[0174] The fixing member 51 and the wall portion 23 can be connected and relatively fixed by welding or other suitable means.

[0175] The first electrode terminal 30 is disposed on a side of the wall portion 23 facing away from the electrode assembly 10, which does not occupy the internal space of the housing 20. It can increase the size of the electrode assembly 10 within a limited space and increase the capacity of the battery cell 6. Moreover, a part of the fixing member 51 is disposed on a side of the first electrode terminal 30 away from the wall portion 23, and the fixing member 51 can apply a force toward the wall portion 23 to the first electrode terminal 30, which is beneficial to pressing the first electrode terminal 30 against the wall portion 23, realizing the assembly of the first electrode terminal 30 and the wall portion 23, and also improving the sealing performance of the battery cell 6.

[0176] In some embodiments, referring to Figure 12 , the fixing member 51 includes a first fixing portion 511 and a second fixing portion 512 connected to each other. The first fixing portion 511 is at least partially disposed on a side of the first limiting portion 313 away from the wall portion 23, and the second fixing portion 512 is fixed to the wall portion 23. Along the thickness direction of the wall portion 23, a part of the first limiting portion 313 and / or a part of the second terminal portion 32 are / is located between the first fixing portion 511 and the wall portion 23.

[0177] The first fixing portion 511 can be disposed to surround at least a part of the second terminal portion 32. The second fixing portion 512 can be bent or curved and extended from the first fixing portion 511 toward the wall portion 23. The second fixing portion 512 can be disposed along the outer periphery of the first electrode terminal 30, and a part of the second fixing portion 512 can be attached to the surface of the wall portion 23 facing away from the main body portion 11 to increase the connection area between the second fixing portion 512 and the wall portion 23 and improve the connection strength and stability.

[0178] In some examples, only a part of the first terminal portion 31 is located between the first fixing portion 511 and the wall portion 23, and at least a part of the first fixing portion 511 is located on a side of the first terminal portion 31 away from the wall portion 23.

[0179] In some other examples, only a part of the second terminal portion 32 is located between the first fixing portion 511 and the wall portion 23, and at least a part of the first fixing portion 511 is located on a side of the second terminal portion 32 away from the wall portion 23.

[0180] In still other examples, a part of the first terminal portion 31 and a part of the second terminal portion 32 are both located between the first fixing portion 511 and the wall portion 23, and at least a part of the first fixing portion 511 is located on a side of the second terminal portion 32 and the first terminal portion 31 away from the wall portion 23.

[0181] Optionally, referring to Figure 12 , the second terminal portion 32 has a second terminal body 322 and a step portion 323, and the step portion 323 protrudes from the outer peripheral surface of the second terminal body 322. Along the thickness direction X, at least a part of the step portion 323 is located between the first terminal portion 31 and the first fixing portion 511. The step portion 323 has a step surface 323a facing away from the first terminal portion 31 along the thickness direction X, and the first fixing portion 511 can directly abut against the step surface 323a, or can be in pressing fit with the step surface 323a indirectly through other structures (such as an insulating member).

[0182] The first fixing portion 511 can apply a force towards the wall portion 23 to the first terminal portion 31 and / or the second terminal portion 32, so as to directly press the first terminal portion 31 against the wall portion 23, or indirectly press the first terminal portion 31 against the wall portion 23 through the second terminal portion 32. When a part of the second terminal portion 32 is located between the first fixing portion 511 and the wall portion 23, or when a part of the first terminal portion 31 and a part of the second terminal portion 32 are both located between the first fixing portion 511 and the wall portion 23, the first fixing portion 511 can also cause the second terminal portion 32 to be pressed against the first terminal portion 31, which is beneficial to improving the connection strength and connection stability between the first terminal portion 31 and the second terminal portion 32.

[0183] In some embodiments, referring to Figure 11 and Figure 12 , the battery cell 6 further includes an insulating member 52, and the insulating member 52 at least partially surrounds the first electrode terminal 30 and is fixed relative to the first electrode terminal 30. The first fixing portion 511 can be embedded inside the insulating member 52. The second fixing portion 512 can be integrally provided on the outer periphery of the insulating member 52, a part of the second fixing portion 512 can also be embedded inside the insulating member 52, and another part of the second fixing portion 512 is connected to the wall portion 23.

[0184] The insulating member 52 can be made of a heat-resistant insulating material. Optionally, the insulating member 52 can be a plastic part. The insulating member 52 can be provided on the outer periphery of the first electrode terminal 30 by an integral injection molding method.

[0185] The insulating member 52 can cover the first fixing portion 511 and also cover a part of the second fixing portion 512. On the one hand, it is beneficial to enhance the installation stability of the fixing member 51. On the other hand, it can also reduce the possibility of the first fixing portion 511 overlapping with the first electrode terminal 30 or the bus bar component, reduce the possibility of the second fixing portion 512 overlapping with the first electrode terminal 30, and reduce the short - circuit risk.

[0186] In some embodiments, referring to Figure 5 and Figure 11 , the first adapter 40 includes a first adapter body 41 and a first protrusion 42. The first adapter body 41 is disposed on the side of the wall portion 23 facing the main body portion 11 and is connected to the first tab 12. The first protrusion 42 protrudes from the surface of the first adapter body 41 facing the wall portion 23, and at least a part of the first protrusion 42 is received in the first through - hole 311 and welded to the first terminal portion 31.

[0187] The part of the first protrusion 42 received in the first through - hole 311 and the first terminal portion 31 are welded to form a first welding portion W1. The first welding portion W1 is directly connected to the outer peripheral surface of the first protrusion 42 and the hole wall of the first through - hole 311. Optionally, the first welding portion W1 can also be directly connected to the surface of the first protrusion 42 facing away from the main body portion 11 and the second surface 312a. The surface of the first protrusion 42 facing away from the main body portion 11 forms a first surface 42a.

[0188] The first adapter body 41 can be connected to the first tab 12 by welding or other suitable means.

[0189] In the embodiment of the present application, disposing the first adapter body 41 on the side of the wall portion 23 facing the main body portion 11 is beneficial to shortening the length of the first tab 12 led out from the main body portion 11, facilitating the connection between the first adapter body 41 and the first tab 12. The first protrusion 42 protrudes from the first adapter body 41, which can enhance the overall structural strength of the first adapter 40 and reduce the risk of deformation during the welding process.

[0190] In some embodiments, the first protrusion 42 is a solid structure.

[0191] The surface of the first adapter body 41 facing the main body portion 11 can be a continuous surface.

[0192] The first protrusion 42 is not provided with structures such as recesses and through - holes, which can increase the current - passing area of the first protrusion 42, improve the anti - deformation ability of the first protrusion 42 itself, and is beneficial to improving the current - passing ability and overall strength of the first adapter 40.

[0193] In some embodiments, referring to Figures 7 to 10 , along the thickness direction X of the wall portion 23, a part of the first tab 12 is located between the first terminal portion 31 and the first adapter body 41 and is connected to the first adapter body 41.

[0194] Optionally, a portion of the first electrode tab 12 may be located between the second limiting portion 314 and the first transition body 41 .

[0195] A portion of the first pole tab 12 is connected to the side of the first adapter body 41 facing the wall portion 23. Thus, a portion of the first pole tab 12 can be accommodated in the gap between the first adapter body 41 and the first terminal portion 31, which is beneficial to saving the folded pole tab space between the first adapter body 41 and the main body 11. In addition, the possibility of the first pole tab 12 contacting the first terminal portion 31 to directly form a current path between the first pole tab 12 and the first terminal portion 31 can also be increased.

[0196] In some embodiments, reference Figure 5 and Figure 11 The second terminal portion 32 has a third surface 32 a away from the main body portion 11 along the thickness direction X. In the direction from the main body portion 11 to the wall portion 23 , the first terminal portion 31 and the first adapter 40 do not extend beyond the third surface 32 a .

[0197] Along the thickness direction X, the third surface 32 a may be flush with the second surface 312 a of the first terminal body 312 facing away from the main body 11 , or the third surface 32 a may extend beyond the second surface 312 a along the direction from the main body 11 to the wall 23 .

[0198] Along the thickness direction X, the first surface 42a of the first adapter 40 received in the first through hole 311 facing away from the main body 11 can be flush with the third surface 32a, and the third surface 32a can also extend beyond the first surface 42a along the direction from the main body 11 to the wall 23.

[0199] The first terminal portion 31 and the first adapter 40 do not extend beyond the third surface 32a. When the second terminal portion 32 is connected to the busbar component, the first terminal portion 31 and the first adapter 40 are not likely to interfere with the busbar component, which is beneficial to reducing the gap between the second terminal portion 32 and the busbar component and improving the connection effect between the two.

[0200] In some embodiments, reference Figure 5 and Figure 11 The first adapter 40 is welded to the first terminal portion 31 to form a first welding portion W1. The second terminal portion 32 has a third surface 32a away from the main body portion 11 along the thickness direction X. The first welding portion W1 does not exceed the third surface 32a along the direction from the main body portion 11 to the wall portion 23.

[0201] In some examples, the first welding portion W1 may be directly connected only to the outer peripheral surface of the portion of the first adapter 40 received in the first through hole 311 and the hole wall of the first through hole 311. Along the direction from the main body portion 11 to the wall portion 23, the first welding portion W1 does not extend beyond the first surface 42a of the first adapter 40 and the second surface 312a of the first terminal body 312. Optionally, along the thickness direction X, the first surface 42a and the second surface 312a may be flush with the third surface 32a.

[0202] In other examples, the first welding portion W1 is directly connected not only to the outer peripheral surface of the portion of the first adapter 40 received in the first through hole 311 and the hole wall of the first through hole 311, but also directly connected to the first surface 42a and the second surface 312a. Along the direction from the main body portion 11 to the wall portion 23, the first welding portion W1 may extend beyond the first surface 42a and the second surface 312a, and the third surface 32a extends beyond the first surface 42a and the second surface 312a.

[0203] The first welding portion W1 does not extend beyond the third surface 32a. When the second terminal portion 32 is connected to the bus bar component, the first welding portion W1 is not likely to interfere with the bus bar component, which is beneficial to reducing the gap between the second terminal portion 32 and the bus bar component and improving the connection effect therebetween.

[0204] In some embodiments, referring to Figure 3 、 Figure 13 and Figure 14 , the electrode assembly 10 includes a second tab 13 led out from the main body portion 11, and the second tab 13 has a polarity opposite to that of the first tab 12. The battery cell 6 further includes a second electrode terminal 60 and a second adapter 70, and the second adapter 70 connects the second tab 13 and the second electrode terminal 60. The base metal of the second electrode terminal 60 is the same as the base metal of the second terminal portion 32.

[0205] The first tab 12 and the second tab 13 may be led out from the same end of the main body portion 11, or may be led out from different ends of the main body portion 11. Optionally, both the first tab 12 and the second tab 13 are led out from the end of the main body portion 11 facing the wall portion 23.

[0206] Optionally, the first tab 12 is a negative tab and the second tab 13 is a positive tab. The materials of the second electrode terminal 60 and the second terminal portion 32 may both be metal aluminum or aluminum alloy. The base metals of the second electrode terminal 60 and the second terminal portion 32 may both be aluminum.

[0207] The second electrode terminal 60 is used to connect with the bus bar component. The base metal of the second electrode terminal 60 is the same as that of the second terminal portion 32. The second terminal portion 32 of one battery cell 6 and the second electrode terminal 60 of another battery cell 6 can be welded to the same bus bar component, which is beneficial to realize the series connection between the two battery cells 6 and reduce the connection difficulty.

[0208] In some embodiments, referring to Figure 3 , Figure 13 and Figure 14 , the battery cell 6 includes a bus bar component 80. At least part of the bus bar component 80 is located on the side of the second electrode terminal 60 away from the main body portion 11. The bus bar component 80, the second adapter 70 and the second electrode terminal 60 are welded together. The base metal of the bus bar component 80, the base metal of the second adapter 70 and the base metal of the second electrode terminal 60 are the same.

[0209] The bus bar component 80, the second adapter 70 and the second electrode terminal 60 are welded to form a second welding portion W2. At least part of the second welding portion W2 is exposed on the side of the bus bar component 80 facing away from the second electrode terminal 60. Thus, the bus bar component 80, the second adapter 70 and the second electrode terminal 60 can be welded from the side of the bus bar component 80 facing away from the wall portion 23, which is beneficial to reduce the possibility of welding particles falling into the interior of the housing 20 and reduce the short-circuit risk.

[0210] The bus bar component 80, the second adapter 70 and the second electrode terminal 60 can be welded together by penetration welding, butt welding or other suitable methods.

[0211] In some examples, referring to Figure 14 , along the thickness direction X, at least part of the bus bar component 80, at least part of the second electrode terminal 60 and at least part of the second adapter 70 are abutted in sequence and welded together by penetration welding.

[0212] In some other examples, referring to Figure 13 , the bus bar component 80 and the second electrode terminal 60 are respectively provided with a second through hole and a third through hole. At least part of the second adapter 70 is received in the second through hole and the third through hole and welded to the hole walls of the second through hole and the third through hole. In other words, a part of the second welding portion W2 connects the second adapter 70 and the hole wall of the second through hole, and another part of the second welding portion W2 connects the second adapter 70 and the hole wall of the third through hole.

[0213] Optionally, the base metal of the bus bar component 80, the base metal of the second adapter 70 and the base metal of the second electrode terminal 60 can all be aluminum.

[0214] In the embodiment of the present application, the bus bar component 80 is pre-connected to the first electrode terminal 30 and the second adapter 70. After the battery cells 6 are stacked, the incoming material and positioning of the bus bar component 80 can be realized, which is beneficial to simplifying the assembly process.

[0215] In the embodiment of the present application, the base metals of the bus bar component 80, the second adapter 70, and the second electrode terminal 60 are set to be the same, which facilitates welding the bus bar component 80, the second adapter 70, and the second electrode terminal 60 together by a single welding process, is beneficial to simplifying the welding operation, and improving the welding efficiency. Moreover, the bus bar component 80 can be directly electrically connected to the second adapter 70 through the second welding part W2, which is beneficial to improving the current-carrying capacity.

[0216] In some embodiments, the base metals of the first terminal part 31 and the first adapter 40 are both copper. The base metal of the second terminal part 32 is aluminum.

[0217] The first tab 12 is a negative tab, and the material of the negative tab is copper. In the embodiment of the present application, the base metal of the first adapter 40 is set to be copper, which facilitates welding between the first adapter 40 and the first tab 12. In the embodiment of the present application, the base metal of the first terminal part 31 is set to be copper, which facilitates welding between the first terminal part 31 and the first adapter 40.

[0218] The second terminal part 32 is used to connect the bus bar component, and the bus bar component is used to connect the positive electrode of another battery cell 6. The material of the positive electrode is usually aluminum. In the embodiment of the present application, the base metal of the second terminal part 32 is set to be aluminum, which facilitates welding between the second terminal part 32 and the bus bar component, and also facilitates welding between the bus bar component and the positive electrode of another battery cell 6.

[0219] In some embodiments, the first terminal part 31 and the second terminal part 32 are connected by at least one of cold rolling, hot rolling, explosive cladding method, and explosive rolling method. Thereby, it is beneficial to improve the connection strength and stability between the first terminal part 31 and the second terminal part 32, and reduce the risk of the connection surfaces of the first terminal part 31 and the second terminal part 32 separating from each other.

[0220] In some embodiments, the housing 20 includes a housing body 21 and an end cover 22. The housing body 21 has an opening 211, and the end cover 22 is connected to the housing body 21 and covers the opening 211. The wall part 23 is the end cover 22.

[0221] The end cover 22 can be connected to the housing body 21 by welding, clamping, bonding, or other suitable means.

[0222] The housing 21 and the end cover 22 are of a split structure. The first electrode terminal 30 is provided on the end cover 22. During assembly, the whole formed by the electrode assembly 10 and the first adapter 40 can be first installed in the housing 21 through the opening 211, then the end cover 22 is covered on the opening 211, and then the first adapter 40 and the first terminal portion 31 are welded, which is beneficial to simplify the assembly operation and reduce the assembly difficulty.

[0223] According to the second aspect of the present application, an embodiment of the present application further provides a battery device 2. Figure 15 It is a partial structural schematic diagram of the battery device provided by some embodiments of the present application. Referring to Figure 2 and Figure 15 , the battery device 2 includes a bus bar component 80 and a battery cell 6 provided according to some embodiments of the first aspect of the present application. The battery cell 6 does not include the bus bar component 80. The base metal of the bus bar component 80 is the same as the base metal of the second terminal portion 32, and the bus bar component 80 is welded to the second terminal portion 32.

[0224] Optionally, the first tab 12 is a negative tab, and the material of the negative tab is copper. The materials of the first terminal portion 31 and the first adapter 40 can be copper or copper alloy, and the base metals of the first terminal portion 31 and the first adapter 40 are both copper, which is convenient for welding. The materials of the second terminal portion 32 and the bus bar component 80 can be aluminum or aluminum alloy, and the base metal of the second terminal portion 32 and the bus bar component 80 is aluminum.

[0225] In the embodiment of the present application, the base metal of the bus bar component 80 and the base metal of the second terminal portion 32 are set to be the same, which is beneficial to simplify the welding operation of the bus bar component 80 and the second terminal portion 32, and improve the welding efficiency and welding effect.

[0226] In some embodiments, the electrode assembly 10 includes a second tab 13 led out from the main body portion 11, and the polarity of the second tab 13 is opposite to that of the first tab 12. The battery cell 6 further includes a second electrode terminal 60, the second electrode terminal 60 is electrically connected to the second tab 13, and the base metal of the second electrode terminal 60, the base metal of the second terminal portion 32, and the metal base of the bus bar component 80 are the same. There are multiple battery cells 6, and the bus bar component 80 is welded to at least the second terminal portion 32 of one battery cell 6 and the second electrode terminal 60 of another battery cell 6.

[0227] The second electrode terminal 60 is connected to the bus bar component 80, and the base metal of the second electrode terminal 60, the base metal of the second terminal portion 32, and the metal base of the bus bar component 80 are the same. The second terminal portion 32 of one battery cell 6 and the second electrode terminal 60 of another battery cell 6 can be welded to the same bus bar component 80, which is beneficial to realize the series connection between two battery cells 6 and reduce the connection difficulty.

[0228] According to a second aspect of the present application, an embodiment of the present application further provides a battery device 2. Referring to Figure 2 and Figure 15 , the battery device 2 includes a battery cell 6 provided according to some embodiments of the first aspect of the present application. The battery cell 6 includes an electrode assembly 10, a housing 20, a first electrode terminal 30, a first adapter 40, a second electrode terminal 60, a second adapter 70, and a current collecting component 80. The electrode assembly 10 includes a main body portion 11, and a first tab 12 and a second tab 13 extending from the main body portion 11. The first electrode terminal 30 and the second electrode terminal 60 are disposed on a wall portion 23. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 connected to each other, and the base metals of the first terminal portion 31 and the second terminal portion 32 are different. In the thickness direction X of the wall portion 23, the second terminal portion 32 is disposed on a side of the wall portion 23 facing away from the main body portion 11 and is used for connection with the current collecting component. The first adapter 40 connects the first tab 12 and the first terminal portion 31, and the base metal of the first adapter 40 is the same as that of the first terminal portion 31. In the thickness direction X of the wall portion 23, the first adapter 40 is at least partially received in the first through hole 311 and welded to the first terminal portion 31. The second adapter 70 connects the second tab 13 and the second electrode terminal 60. The base metal of the second electrode terminal 60 is the same as that of the second terminal portion 32. At least a part of the current collecting component 80 is located on a side of the second electrode terminal 60 away from the main body portion 11. The current collecting component 80, the second adapter 70, and the second electrode terminal 60 are welded, and the base metals of the current collecting component 80, the second adapter 70, and the second electrode terminal 60 are the same.

[0229] In some embodiments, the battery device 2 includes a plurality of battery cells 6, and at least some of the plurality of battery cells 6 include an electrode assembly 10, a housing 20, a first electrode terminal 30, a first adapter 40, a second electrode terminal 60, a second adapter 70, and a current collecting component 80. The first adapter 40 connects the first tab 12 and the first terminal portion 31. The second adapter 70 connects the second tab 13 and the second electrode terminal 60. The current collecting component 80, the second adapter 70, and the second electrode terminal 60 are welded.

[0230] According to a third aspect of the present application, an embodiment of the present application further provides an electrical device, which includes the battery device 2 provided according to any one of the embodiments of the second aspect of the present application, and the battery device 2 is used to provide electrical energy.

[0231] The battery cell 6 provided by the embodiment of the present application includes an electrode assembly 10, a housing 20, a first electrode terminal 30, a first adapter 40, a second electrode terminal 60, a second adapter 70, and a bus bar component 80. The housing 20 includes a housing body 21 and an end cap 22. The electrode assembly 10 is accommodated in the housing 20. The electrode assembly 10 includes a main body portion 11, a first tab 12 and a second tab 13 extending from the main body portion 11. The first electrode terminal 30 and the second electrode terminal 60 are disposed on the end cap 22. The first electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32 connected to each other. The base metals of the first terminal portion 31 and the second terminal portion 32 are different. The first terminal portion 31 is provided with a first through hole 311, and the first through hole 311 penetrates the first terminal portion 31 along the thickness direction X of the end cap 22. The second terminal portion 32 is disposed on a side of the end cap 22 facing away from the main body portion 11 and is used for connection with the bus bar component. The first adapter 40 is connected to the first tab 12. The base metal of the first adapter 40 is the same as the base metal of the first terminal portion 31. At least a part of the first adapter 40 is accommodated in the first through hole 311 and welded to the first terminal portion 31. The second electrode terminal 60, the second adapter 70, and the bus bar component 80 are welded by external laser penetration to form a second welding portion W2, and a part of the second welding portion W2 is exposed on a side of the bus bar component 80 facing away from the end cap 22. Along the thickness direction X of the end cap 22, a part of the first tab 12 is located between the first terminal portion 31 and the first adapter 40 and is connected to the first adapter 40 and the first terminal portion 31.

[0232] 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 foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered by the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that: include: The housing comprises a wall portion, wherein the wall portion is provided with an electrode lead-out hole; An electrode assembly is contained in the housing, and includes a main body and a first electrode tab extending from the main body; A first electrode terminal, comprising a first terminal portion and a second terminal portion connected to each other, the base metal of the first terminal portion and the base metal of the second terminal portion are different, the first terminal portion is at least partially disposed in the electrode lead-out hole, the first terminal portion is provided with a first through hole, the first through hole penetrates the first terminal portion along the thickness direction of the wall portion, the second terminal portion is disposed on a side of the wall portion facing away from the main body portion and is used to connect to the current collecting component, the second terminal portion is disposed along the outer periphery of a portion of the first terminal portion, and is stacked with another portion of the first terminal portion along the thickness direction; as well as The first adapter is connected to the first tab, the base metal of the first adapter is the same as the base metal of the first terminal portion, and at least a portion of the first adapter is accommodated in the first through hole and welded to the first terminal portion.

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

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

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

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

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

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

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

9. The battery cell according to claim 8, characterized in that: Along the thickness direction, a portion of the first electrode tab is located between the second limiting portion and the first adapter.

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

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

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

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

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

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

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

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

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

19. The battery cell according to any one of claims 1 to 6, characterized in that: The electrode assembly includes a second electrode tab extending from the main body, wherein the second electrode tab has a polarity opposite to that of the first electrode tab; The battery cell further includes a second electrode terminal and a second adapter, wherein the second adapter connects the second electrode tab and the second electrode terminal; A base metal of the second electrode terminal is the same as a base metal of the second terminal portion.

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

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

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

23. The battery cell according to any one of claims 1 to 6, characterized in that: The housing comprises a shell and an end cover, the shell has an opening, and the end cover is connected to the shell and covers the opening; The wall portion is the end cover.

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

25. The battery device according to claim 24, characterized in that The electrode assembly includes a second electrode tab extending from the main body, wherein the second electrode tab has a polarity opposite to that of the first electrode tab; The battery cell further includes a second electrode terminal, the second electrode terminal is electrically connected to the second electrode tab, and the base metal of the second electrode terminal, the base metal of the second terminal portion and the metal base of the current collecting component are the same; There are multiple battery cells; The busbar member is welded to at least the second terminal portion of one of the battery cells and the second electrode terminal of another of the battery cells.

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

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

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