Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. An electrode assembly comprises a main body and a tab led from the main body. An electrode terminal is at least partially located on a side of a wall away from the main body. The electrode terminal comprises a first terminal part and a second terminal part. The second terminal part is arranged on a side of the first terminal part away from the main body. A side of the first terminal part facing the second terminal part is provided with a first protrusion and a first recess in parallel. A side of the second terminal part facing the first terminal part is provided with a second protrusion and a second recess in parallel. The first protrusion is at least partially accommodated in the second recess. The second protrusion is at least partially accommodated in the first recess. An adapter is connected to the tab. The adapter is welded to the first terminal part and forms a first welding part. A first part of the first welding part is formed on the first protrusion. The base metal of the first terminal part is different from the base metal of the second terminal part. The base metal of the adapter is the same as the base metal of the first terminal part.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to a battery cell, a battery device, and an electrical device. Background Technology

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

[0003] In the development of battery technology, how to improve the energy density of individual battery cells while meeting the reliability requirements of individual battery cells has become a research direction in battery technology. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device that can improve the energy density of the battery cell.

[0005] On one hand, embodiments of this application provide a battery cell including a casing, an electrode assembly, electrode terminals, and an adapter. The casing includes a wall portion with a through hole. The electrode assembly is disposed within the casing and includes a main body portion and tabs extending from the main body portion. The electrode terminals are at least partially located on the side of the wall portion away from the main body portion. The electrode terminals include a first terminal portion and a second terminal portion. The second terminal portion is disposed on the side of the first terminal portion facing north of the main body portion. The side of the first terminal portion facing the second terminal portion has a first protrusion and a first recess arranged side by side. The side of the second terminal portion facing the first terminal portion has a second protrusion and a second recess arranged side by side. The first protrusion is at least partially accommodated in the second recess, and the second protrusion is at least partially accommodated in the first recess.

[0006] The adapter is connected to the electrode tab and is soldered to the first terminal portion to form a first soldered portion. A first portion of the first soldered portion is formed on the first protrusion. The base metal of the first terminal portion is different from the base metal of the second terminal portion, while the base metal of the adapter is the same as the base metal of the first terminal portion.

[0007] In the above scheme, the two terminal portions of the electrode terminals do not adopt an overall thickening design, but rather a local thickening and local thinning design. In this design, the electrode terminals have a first protrusion and a second recess at the locations where they need to be welded to the adapter. The first protrusion meets the welding requirements, and the second recess accommodates the first protrusion to reduce the overall thickness of the electrode terminal. Similarly, at the locations where they need to be welded to the busbar, a second protrusion and a first recess are provided. The second protrusion meets the welding requirements, and the first recess accommodates the second protrusion to reduce the overall thickness of the electrode terminal. This design can reduce the thickness of the electrode terminals while meeting welding requirements, thereby reducing the overall size of the battery cell in the thickness direction and increasing the energy density of the battery cell.

[0008] In some embodiments, the electrical components include a support plate fixed to the outside of the housing along a first direction, a first output assembly fixed to the side of the support plate opposite to the plurality of battery cells, and a first adapter connected to the first output assembly and disposed on the side of the support plate opposite to the plurality of battery cells. The first adapter is at least partially located within the receiving space and connected to the first connector.

[0009] In the above solution, when the battery device needs to be inspected and maintained or the electrical components malfunction, the first part has a certain redundant length and is allowed to deform to a certain extent. Therefore, the first part will not hinder the movement of the first adapter. Some structures in the first part and the first adapter can be moved together to the outside of the box, thereby realizing the disassembly and separation of the two in the external environment. This helps to reduce maintenance difficulty and cost and improve maintenance efficiency.

[0010] In some embodiments, the first terminal portion is located on the outside of the wall portion, and a portion of the adapter is accommodated in the through hole.

[0011] In the above scheme, the first terminal is located on the outside of the wall, that is, the electrode terminal does not penetrate into the inside of the shell. In this way, the assembly between the electrode assembly and the shell will not be affected by the interference of the electrode terminal. This design can reduce the space occupied by the electrode terminal in the shell, which is conducive to increasing the size of the electrode assembly and increasing the capacity of the battery cell in a limited space.

[0012] In some embodiments, the battery cell further includes a fixing member, which includes a limiting part and a fixing part connected to each other. The limiting part is located on the side of the wall portion away from the main body portion. Along the thickness direction of the wall portion, a portion of the first terminal portion is located between the limiting part and the wall portion, and the fixing part is connected to the wall portion.

[0013] In the above scheme, the electrode terminals are fixed to the wall by a fastener, which helps to simplify the assembly of the first electrode terminals. Furthermore, the electrode terminals can be set as a whole on the side of the wall away from the main body, which can reduce the internal space occupied by the casing and help to increase the size of the electrode assembly and the capacity of the battery cell within a limited space.

[0014] In some embodiments, the first protrusion surrounds the second protrusion; or, the second protrusion surrounds the first protrusion.

[0015] In the above scheme, by setting the first protrusion around the second protrusion, or setting the second protrusion around the first protrusion, the orthographic projections of the first welding part and the second welding part can be misaligned in the same plane perpendicular to the thickness direction. This helps to reduce the risk of excessive electrode terminal thickness caused by the first welding part and the second welding part being concentrated in the same area of ​​the electrode terminal, thereby reducing the overall size of the battery cell in the thickness direction and increasing the energy density of the battery cell.

[0016] In some embodiments, the second terminal portion has a third recess on the side opposite to the first terminal portion, and in the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the third recess and the orthographic projection of the first protrusion at least partially overlap.

[0017] In the above solution, considering that the positioning area between the busbar and the electrode terminal is often misaligned with the welding area, the embodiment of this application sets the orthographic projection of the third concave portion to at least partially overlap with the orthographic projection of the first convex portion in the same plane perpendicular to the thickness direction of the wall portion. In this way, the welding area between the busbar and the electrode terminal, i.e. the area where the second welding part is located, can be staggered from the first convex portion, thereby reducing the risk of excessive electrode terminal thickness caused by the second welding part being located in the area where the first convex portion is located, reducing the overall size of the battery cell in the thickness direction, and increasing the energy density of the battery cell.

[0018] In some embodiments, the first protrusion is disposed around the second protrusion, and there are multiple third recesses. In the same plane perpendicular to the thickness direction, the orthographic projections of the multiple third recesses are distributed at intervals around the orthographic projection of the first recess.

[0019] In the above solution, since the first protrusion and the first portion of the second protrusion can be located in the central region of the electrode terminal, and the first welding portion can be located within the first protrusion, and the second welding portion can be located within the first portion, the first welding portion and the second welding portion can be staggered and both correspondingly located in the central region of the electrode terminal. This reduces the adverse effects of the formation process of the first welding portion and the second welding portion on the fixing parts and insulating parts located on the outer periphery of the electrode terminal, thereby improving the product yield.

[0020] In some embodiments, the first terminal portion includes a first base, and both the first protrusion and the first recess are located on the side of the first base away from the main body. The second terminal portion includes a second base, and both the second protrusion and the second recess are located on the side of the second base facing the main body, and the thickness of the second base is greater than the thickness of the first base.

[0021] In the above scheme, considering that the melting point of aluminum is often lower than that of copper, under the same welding conditions, the dimension of the first weld portion in the thickness direction is often larger than that of the second weld portion in the thickness direction. Based on this, since the first and second protrusions usually have the same dimension in the thickness direction, in order to meet the respective dimensional requirements of the first and second weld portions, the embodiment of this application sets the thickness of the second substrate to be greater than the thickness of the first substrate. This reduces the risk of the second weld portion penetrating into the first terminal portion and improves welding reliability. Furthermore, this design of setting different substrate thicknesses according to different base metals also helps to reduce the difficulty of manufacturing the electrode terminals.

[0022] In some embodiments, in the thickness direction of the wall portion, the sum of the dimensions of the first protrusion and the first base is H1, the dimension of the first base is H2, the sum of the dimensions of the second protrusion and the second base is H3, the dimension of the second base is H4, and 2.5mm≥H3>H1≥1.3mm≥H4>H2≥0.5mm.

[0023] In the above scheme, the first welding portion is partially located within the first substrate and partially within the first protrusion, while the second welding portion is partially located within the second substrate and partially within the second protrusion. Based on this, the embodiments of this application set H3 to be no less than 1.3 mm and H1 > H3, thereby satisfying the formation requirements of the first and second welding portions and reducing the risk of the first welding portion extending into the second terminal portion and the second welding portion extending into the first terminal portion. Simultaneously, the embodiments of this application also set H3 to be no greater than 2.5 mm, thereby reducing the adverse effects on the overall thickness of the electrode terminal caused by excessively large dimensions of the first and second protrusions in the thickness direction, which helps to reduce the overall size of the battery cell in the thickness direction and improve the energy density of the battery cell.

[0024] Furthermore, in this embodiment, H2 and H4 are set to H4 > H2 to satisfy the requirement that H1 > H3, thereby better matching the size requirements of the first and second welding parts. H2 is set to be no less than 0.5 mm so that the first and second substrates can have a certain thickness, improving the overall structural reliability of the electrode terminals. At the same time, H4 is set to be no more than 1.3 mm to reduce the adverse effects on the overall thickness of the electrode terminals, which helps to reduce the overall size of the battery cell in the thickness direction and improve the energy density of the battery cell.

[0025] In some embodiments, in the thickness direction of the wall portion, the sum of the dimensions of the first protrusion and the first base is H1, and the sum of the dimensions of the second protrusion and the second base is H3, where 3≥H3 / H1≥2.

[0026] In the above scheme, setting H3 / H2 to be no less than 2 helps to increase the dimensions of the second protrusion and the second substrate, as well as the size of H3, thereby better matching the formation requirements of the first and second welding parts. Simultaneously, setting H3 / H2 to be no greater than 3 helps to reduce the risk of excessive electrode terminal thickness due to an excessively large H3 size, thus helping to reduce the overall size of the battery cell in the thickness direction and improve the energy density of the battery cell.

[0027] In some embodiments, the second terminal portion includes a second base, and both the second protrusion and the second recess are located on the side of the second base facing the main body portion. In the thickness direction, the dimension of the first base is H2, and the sum of the dimensions of the second protrusion and the second base is H3, where 5 ≥ H3 / H2 ≥ 1.5.

[0028] In the above scheme, by setting H3 / H2 to not less than 1.5, the dimensions of the second protrusion and the second base, as well as the size of H3, are increased to meet the formation requirements of the second welded part. Simultaneously, setting H3 / H2 to not greater than 5 allows the first base to have a certain thickness, thus meeting the fabrication requirements of the first terminal and the load-bearing requirements of the first base for the second terminal.

[0029] In some embodiments, the first terminal portion includes a first base, and both the first protrusion and the first recess are located on the side of the first base away from the main body portion. In the thickness direction, the sum of the dimensions of the first protrusion and the first base is H1, the dimension of the second base is H4, and 5≥H1 / H4≥1.

[0030] In the above scheme, by setting H1 / H4 to be no less than 1, the dimensions of the first protrusion and the first substrate, as well as the size of H1, are increased to meet the formation requirements of the first welded portion. Simultaneously, setting H1 / H4 to be no greater than 5 allows the second substrate to have a certain thickness, thus meeting the fabrication requirements of the second terminal portion.

[0031] Secondly, embodiments of this application provide a battery device, which includes a busbar component and a battery cell as described in any of the foregoing embodiments. The busbar component is welded to a second terminal portion, and a second weld portion is formed at the second protrusion.

[0032] In the above scheme, the two terminal portions of the electrode terminals do not adopt an overall thickening design, but rather a local thickening and local thinning design. In this design, a first protrusion and a second recess are provided at the location where the first welding portion is formed. The first protrusion meets the welding requirements, and the second recess accommodates the first protrusion to reduce the overall thickness of the electrode terminal. Similarly, a second protrusion and a first recess are provided at the location where the second welding portion is to be formed. The second protrusion meets the welding requirements, and the first recess accommodates the second protrusion to reduce the overall thickness of the electrode terminal. This design can reduce the thickness of the electrode terminals while meeting welding requirements, thereby reducing the overall size of the battery cell in the thickness direction and increasing the energy density of the battery cell.

[0033] In some embodiments, the first weld portion and the second weld portion overlap in a direction perpendicular to the thickness direction of the wall portion.

[0034] In the above scheme, by adjusting the structure of the electrode terminals, the orthographic projections of the first and second welding portions can be staggered in the same plane perpendicular to the thickness direction. Furthermore, in the direction perpendicular to the thickness of the wall, the first and second welding portions can overlap, allowing them to share the same height space of the electrode terminals in the thickness direction. This reduces the overall thickness of the electrode terminals, thereby reducing the overall size of the battery cell in the thickness direction and increasing the energy density of the battery cell.

[0035] Thirdly, embodiments of this application provide an electrical device, which includes the battery device in any of the foregoing embodiments.

[0036] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0037] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0038] Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application;

[0039] Figure 2This is a schematic diagram of the structure of a battery device provided in some embodiments of this application;

[0040] Figure 3 This is a schematic diagram of the structure of a battery module in a battery device provided in some embodiments of this application;

[0041] Figure 4 This is a cross-sectional structural diagram of a battery cell provided in some embodiments of this application;

[0042] Figure 5 yes Figure 4 Enlarged structural diagram of region Q in the middle region;

[0043] Figure 6 This application provides a schematic diagram of the structure of an electrode terminal in an electric field unit according to some embodiments;

[0044] Figure 7 This application provides a schematic diagram of the cooperative structure of an electric field unit and a current collector according to some embodiments;

[0045] Figure 8 This application provides a schematic diagram of the structure of an electrode terminal in an electric field unit according to some embodiments;

[0046] Figure 9 This application provides a schematic diagram of the structure of the wall portion of an electric field unit according to some embodiments;

[0047] Figure 10 This application provides a schematic diagram of the cooperative structure of an electric field unit and a current collector according to some embodiments;

[0048] Figure 11 This application provides a schematic diagram of the structure of the first terminal portion in an electric field unit according to some embodiments;

[0049] Figure 12 This is a schematic diagram of the structure of the electrode terminal in an electric field unit provided by some embodiments of this application.

[0050] Tag name:

[0051] Vehicle 1000; Battery unit 100; Controller 200; Motor 300; Housing 400; First housing section 401; Second housing section 402; Receiving section 403; Battery cell 500; Battery module 600;

[0052] 10 outer shell; 11 wall portion; 12 through hole; 13 housing; 14 end cap; 20 electrode assembly; 21 main body portion; 22 electrode tab; 30 electrode terminal; 31 first terminal portion; 311 first protrusion; 312 first recess; 313 first base; 32 second terminal portion; 321 second protrusion; 322 second recess; 323 second base; 324 third recess; 33 first welding portion; 34 second welding portion; 40 adapter; 50 busbar component; 60 fixing component; 70 insulating component; X-direction; Y-direction. Detailed Implementation

[0053] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0056] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0057] Unless otherwise specified, all embodiments and optional embodiments of this application can be combined to form new technical solutions.

[0058] Unless otherwise specified, all technical features and optional technical features of this application may be combined to form new technical solutions.

[0059] Unless otherwise specified, all steps of this application may be performed sequentially or randomly, preferably sequentially. For example, the method includes steps (a) and (b), indicating that the method may include steps (a) and (b) performed sequentially, or it may include steps (b) and (a) performed sequentially. For example, the mention that the method may also include step (c) indicates that step (c) may be added to the method in any order; for example, the method may include steps (a), (b), and (c), or it may include steps (a), (c), and (b), or it may include steps (c), (a), and (b), etc.

[0060] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, the character " / " in this document generally indicates that the preceding and following related objects have an "or" relationship.

[0061] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0062] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0063] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0064] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0065] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0066] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator, with the separator positioned between the positive and negative electrodes. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0067] In some embodiments, the positive electrode may be a positive electrode sheet, which 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.

[0068] As an example, the positive current collector has two surfaces opposite each other in its own thickness direction, and the positive active material is disposed on either or both of the two opposite surfaces of the positive current collector.

[0069] As an example, the positive current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector can be formed by forming a metal material (aluminum, aluminum alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0070] As an example, the positive electrode active material may include at least one of the following materials: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used. These positive electrode active materials may be used alone or in combination of two or more. Examples of lithium phosphate include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), lithium iron phosphate and carbon composites, lithium manganese phosphate (such as LiMnPO4), lithium manganese phosphate and carbon composites, lithium manganese iron phosphate, and lithium manganese iron phosphate and carbon composites. Examples of lithium transition metal oxides may include, but are not limited to, lithium cobalt oxides (such as LiCoO2), lithium nickel oxides (such as LiNiO2), lithium manganese oxides (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxides, lithium manganese cobalt oxides, lithium nickel manganese oxides, lithium nickel cobalt manganese oxides (such as LiNi1 / 3Co1 / 3Mn1 / 3O2 (also abbreviated as NCM333), LiNi0.5Co0.2Mn0.3O2 (also abbreviated as NCM523), LiNi0.5Co The following are included: 0.25Mn0.25O2 (also known as NCM211), LiNi0.6Co0.2Mn0.2O2 (also known as NCM622), LiNi0.8Co0.1Mn0.1O2 (also known as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.8Co0.15Al0.05O2), and their modified compounds. Modified compounds refer to substances obtained by doping or coating, etc., based on the above-mentioned materials.

[0071] In some embodiments, the positive electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the positive electrode, the surface of the foamed metal may or may not contain a positive electrode active material. As an example, a positive electrode active material is filled and / or deposited within the foamed metal.

[0072] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0073] As an example, the negative electrode current collector can be a metal foil, a conductive polymer material, a carbon material, or a composite current collector. For example, as a metal foil, pure metals, alloys, or surface-treated metals can be used, including but not limited to stainless steel, copper, aluminum, nickel, titanium, or silver. The composite current collector may include a polymer material substrate and a metal layer. The composite current collector can be formed by forming a metal material (copper, copper alloys, nickel, nickel alloys, titanium, titanium alloys, silver, and silver alloys, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0074] As an example, 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.

[0075] As an example, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0076] As an example, the negative electrode active material may be a negative electrode active material known in the art for use in battery cells. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0077] In some embodiments, the negative electrode can be a foamed metal. The foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. When foamed metal is used as the negative electrode sheet, the surface of the foamed metal may or may not have a negative electrode active material.

[0078] As an example, negative electrode active materials can be filled or / and deposited within the negative electrode current collector.

[0079] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0080] In some embodiments, the battery cell also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes. This application does not impose specific limitations on the type of electrolyte; it can be selected according to requirements. The electrolyte may include a liquid electrolyte solution and includes an electrolyte salt and a solvent.

[0081] In some embodiments, the electrolyte salt may be selected from at least one of lithium hexafluorophosphate, lithium tetrafluoroborate, lithium perchlorate, lithium hexafluoroarsenate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium trifluoromethanesulfonate, lithium difluorophosphate, lithium difluorooxalate borate, lithium dioxalate borate, lithium difluorodioxalate phosphate, and lithium tetrafluorooxalate phosphate.

[0082] In some embodiments, the solvent may be selected from at least one of ethylene carbonate, propylene carbonate, methyl ethyl carbonate, diethyl carbonate, dimethyl carbonate, dipropyl carbonate, methyl propyl carbonate, ethyl propyl carbonate, butyl carbonate, fluoroethylene carbonate, methyl formate, methyl acetate, ethyl acetate, propyl acetate, methyl propionate, ethyl propionate, propyl propionate, methyl butyrate, ethyl butyrate, 1,4-butyrolactone, sulfolane, dimethyl sulfone, methyl ethyl sulfone, and diethyl sulfone. The solvent may also be an ether solvent. Ether solvents may include one or more of ethylene glycol dimethyl ether, ethylene glycol diethyl ether, diethylene glycol dimethyl ether, triethylene glycol dimethyl ether, tetraethylene glycol dimethyl ether, 1,3-dioxolane, tetrahydrofuran, methyl tetrahydrofuran, diphenyl ether, and crown ethers.

[0083] In some embodiments, the electrolyte may optionally include additives. For example, additives may include negative electrode film-forming additives, positive electrode film-forming additives, and additives that can improve certain properties of the battery cell, such as additives that improve the overcharge / fast charge performance of the battery cell, additives that improve the high-temperature performance of the battery cell, and additives that improve the low-temperature performance of the battery cell.

[0084] The electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0085] In some embodiments, the electrode assembly is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0086] In some implementations, the electrode assembly is a stacked structure.

[0087] As an example, multiple positive and negative electrode plates can be set, and multiple positive and multiple negative electrode plates can be stacked alternately.

[0088] As an example, multiple positive electrode sheets can be set, and negative electrode sheets are folded to form multiple stacked folded segments, with a positive electrode sheet sandwiched between adjacent folded segments.

[0089] As an example, both the positive and negative electrode sheets are folded to form multiple stacked folded segments.

[0090] As an example, multiple separators can be provided, each positioned between any adjacent positive or negative electrode plates.

[0091] As an example, the separator can be set continuously, either by folding or rolling between any adjacent positive or negative electrode plates.

[0092] In some embodiments, the electrode assembly can be cylindrical, flat, or polygonal, etc.

[0093] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0094] In some embodiments, the battery cell may include a casing. The casing may be a steel casing, an aluminum casing, a plastic casing (such as a polypropylene casing), a composite metal casing (such as a copper-aluminum composite casing), or an aluminum-plastic film, etc. In some embodiments, the casing may be a sealed structure or a non-sealed structure. As an example, when the casing is a non-sealed structure, the casing serves to protect the electrode assembly, and a sealing bag is included between the casing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag may be a bag-shaped insulating component or an aluminum-plastic film. When the casing is a sealed structure, it is used to encapsulate components such as the electrode assembly and electrolyte.

[0095] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0096] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0097] In some embodiments, at least one electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the electrode tab. The electrode terminal can be directly connected to the electrode tab, or it can be indirectly connected to the electrode tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0098] The battery apparatus mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells connected in series, parallel, or mixed connections via a busbar.

[0099] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0100] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0101] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cells housed within the housing.

[0102] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0103] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0104] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0105] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0106] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0107] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0108] Considering that the electrode terminals need to be welded to both the adapter and the busbar, and that the adapter and busbar typically consist of different materials, the negative electrode terminal requires structures with different base metals to be welded and fixed to both the adapter and the busbar to meet welding requirements. Furthermore, to reduce the likelihood of the weld pool crossing the composite cross-section of these two structures, leading to dissimilar metal welding, the two structures in the electrode terminal need to have sufficient thickness, which limits the energy density of the battery cell.

[0109] In view of this, the present application provides a battery cell, a battery device, and an electrical device. The first terminal portion has a first recess and a first protrusion, and the second terminal portion has a second recess and a second protrusion. The presence of the first protrusion can meet the welding thickness requirements with the adapter, and the presence of the second protrusion can meet the welding thickness requirements with the busbar. The presence of the first and second recesses can meet the assembly requirements of the first and second terminal portions while reducing the overall size of the electrode terminals in the thickness direction of the wall portion, thereby improving the energy density of the battery cell while meeting the welding requirements.

[0110] The technical solutions described in this application are applicable to battery cells, battery devices, and electrical devices using battery devices. Electrical devices can take many forms, such as mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft. For example, spacecraft include airplanes, rockets, space shuttles, and spacecraft.

[0111] The battery devices described in this application are not limited to the electrical devices described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0112] Please see Figure 1 , Figure 1 This is a simplified schematic diagram of a vehicle 1000 provided in an embodiment of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 can be installed inside the vehicle 1000; specifically, for example, the battery device 100 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 100 may also include a controller 200 and a motor 300. The controller 200, for example, is used to control the battery to supply power to the motor 300. The battery device 100 can be used for starting, navigation, etc., of the vehicle 1000. Of course, the battery device 100 can also be used to drive the vehicle 1000, replacing or partially replacing gasoline or natural gas to provide propulsion for the vehicle 1000.

[0113] Please refer to Figure 2 , Figure 2This is an exploded view of a battery device provided in some embodiments of this application. The battery device 100 includes a housing 400 and individual battery cells (not shown), with the individual battery cells housed within the housing 400. The housing 400 is used to house the individual battery cells, and the housing 400 can have various structures. In some embodiments, the housing 400 may include a first housing portion 401 and a second housing portion 402, which overlap each other, and the first housing portion 401 and the second housing portion 402 together define a receiving portion 403 for housing the individual battery cells. The second box portion 402 can be a hollow structure with one end open, and the first box portion 401 is a plate-like structure. The first box portion 401 covers the open side of the second box portion 402 to form a box with a receiving portion 403. Alternatively, both the first box portion 401 and the second box portion 402 can be hollow structures with one side open, and the open side of the first box portion 401 covers the open side of the second box portion 402 to form a box 400 with a receiving portion. Of course, the first box portion 401 and the second box portion 402 can be various shapes, such as cylinders, cuboids, etc.

[0114] In the battery device 100, there can be one or more battery cells. If there are multiple battery cells, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells are connected in both series and parallel configurations. Multiple battery cells can be directly connected in series, in parallel, or in a mixed configuration, and then the entire assembly of the multiple battery cells is housed within the housing 400. Alternatively, multiple battery cells can first be connected in series, in parallel, or in a mixed configuration to form a battery module 600, and then the multiple battery modules 600 can be connected in series, in parallel, or in a mixed configuration to form a whole, which is then housed within the housing 400.

[0115] Figure 3 for Figure 2 The diagram shows an exploded view of the battery module 600. In some embodiments, such as... Figure 3 As shown, there are multiple battery cells 500. These multiple battery cells 500 are first connected in series, parallel, or in a mixed manner to form a battery module 600. The multiple battery modules 600 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing.

[0116] The structure of the battery cell will then be described with reference to the accompanying drawings. Please refer to [the attached diagram]. Figures 4 to 6 This application provides a battery cell 500, which includes a housing 10, an electrode assembly 20, an electrode terminal 30, and an adapter 40. The housing 10 includes a wall portion 11 with a through hole 12. The electrode assembly 20 is disposed inside the housing 10 and includes a main body portion 21 and a tab 22 extending from the main body portion 21.

[0117] The electrode terminal 30 is at least partially located on the side of the wall portion 11 away from the main body portion 21. The electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32. The second terminal portion 32 is disposed on the side of the first terminal portion 31 facing north towards the main body portion 21. The side of the first terminal portion 31 facing the second terminal portion 32 is provided with a first protrusion 311 and a first recess 312 arranged side by side. The side of the second terminal portion 32 facing the first terminal portion 31 is provided with a second protrusion 321 and a second recess 322 arranged side by side. The first protrusion 311 is at least partially accommodated in the second recess 322, and the second protrusion 321 is at least partially accommodated in the first recess 312.

[0118] The adapter 40 is connected to the tab 22 and is soldered to the first terminal portion 31 to form a first solder portion 33. A first portion of the first solder portion 33 is formed on the first protrusion 311. The base metal of the first terminal portion 31 is different from the base metal of the second terminal portion 32, while the base metal of the adapter 40 is the same as the base metal of the first terminal portion 31.

[0119] The outer casing 10 is a shell structure in the battery cell 500 used to house and protect other components. The outer casing 10 has a hollow structure and includes multiple wall structures, with wall portion 11 being one of the shell wall structures on the outer casing 10. Optionally, the outer casing 10 includes a housing 13 and an end cap 14, with the end cap 14 covering the opening of the housing 13. The wall portion 11 can be the end cap 14, or it can be a shell wall structure on the housing 13. The attached figure shows the case where the wall portion 11 is the end cap 14.

[0120] The electrode assembly 20 is disposed within the housing 10. The electrode assembly 20 is a core component of the battery cell 500 used to realize charging and discharging functions. The electrode assembly 20 includes a main body 21 and tabs 22. The main body 21 is the main component of the electrode assembly 20, and the tabs 22 are components in the electrode assembly 20 used for electrical connection to the electrode terminals 30. The electrode assembly 20 may include two tabs 22, with at least one tab 22 extending from the end of the main body 21 facing the wall portion 11 to achieve electrical connection with the electrode terminals 30 located on the wall portion 11.

[0121] The electrode terminal 30 is used to realize the electrical connection between the battery cell 500 and other external structures. The electrode terminal 30 is at least partially located on the side of the wall portion 11 facing away from the main body portion 21. In the thickness direction Y of the wall portion 11, the electrode terminal 30 may be entirely located on the side of the wall portion 11 facing away from the main body portion 21, or only a part of the electrode terminal 30 may be located on the side of the wall portion 11 facing away from the main body portion 21, while the other part may be accommodated in the through hole 12.

[0122] The adapter 40 is used to achieve electrical connection between the tab 22 and the electrode terminal 30. The electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32. The second terminal portion 32 is disposed on the side of the first terminal portion 31 facing away from the main body portion 21. The first terminal portion 31 can directly contact and be welded to the adapter 40. Furthermore, the first terminal portion 31 and the adapter 40 are provided with the same base metal. Here, "base metal" refers to the main metal composition. For example, if the main metal composition of the first terminal portion 31 is the same as that of the adapter 40, the material consistency between the first terminal portion 31 and the adapter 40 can be improved, which helps to improve welding quality and stability.

[0123] The second terminal portion 32 is used to directly contact and weld with the busbar component 50, thereby realizing the series or parallel connection of multiple battery cells 500. Considering that the busbar component 50 and the adapter 40 typically have different base metals, this embodiment sets the base metal of the first terminal portion 31 and the base metal of the second terminal portion 32 differently, and sets the second terminal portion 32 to have the same base metal as the busbar component 50, thereby improving the welding quality between the two. Optionally, the base material of the first terminal portion 31 includes copper, and the base material of the second terminal portion 32 includes aluminum.

[0124] It should be noted that the battery cell 500 typically includes two terminals: a positive terminal and a negative terminal, with two tabs 22 electrically connected to the two terminals respectively. Based on this, the electrode terminal 30 mentioned in this embodiment refers to the negative terminal, while the wall portion 11 is the shell wall structure on the outer casing 10 that has the negative terminal.

[0125] To improve the energy density of the battery cell 500, the present application embodiment improves the structure of the first terminal portion 31 and the second terminal portion 32. Specifically, the first terminal portion 31 has a first protrusion 311 and a first recess 312 arranged side by side on the side facing the second terminal portion 32. The first protrusion 311 is a protruding structure on the first terminal portion 31, which includes a first base 313. The first protrusion 311 protrudes relative to the first base 313 along the thickness direction Y. The first recess 312 is a recessed space within the first terminal portion 31. Due to the presence of the first protrusion 311, there is a recessed space around the first protrusion 311, which is the first recess 312. The bottom wall of the first recess 312 is the surface of the first base 313 facing the second terminal portion 32. The first protrusion 311 and the first recess 312 can have various positional relationships. For example, the first recess 312 can be disposed around the periphery of the first protrusion 311, or the first protrusion 311 can be disposed around the periphery of the first recess 312.

[0126] Similar to the first terminal portion 31, the second terminal portion 32 has a second protrusion 321 and a second recess 322 arranged side by side on the side facing the first terminal portion 31. The second protrusion 321 is a protruding structure on the second terminal portion 32, which includes a second base 323. The second protrusion 321 protrudes relative to the second base 323 along the thickness direction Y. The second recess 322 is a recessed space within the second terminal portion 32. Due to the presence of the second protrusion 321, a recessed space exists around the second protrusion 321; this recessed space is the second recess 322, and its bottom wall is the surface of the first base 313 facing the second terminal portion 32. The second protrusion 321 and the second recess 322 can have various positional relationships; for example, the second recess 322 can be arranged around the periphery of the second protrusion 321, or the second protrusion 321 can be arranged around the periphery of the second recess 322.

[0127] The first protrusion 311 is used to meet the welding requirements between the adapter 40 and the first terminal portion 31. The first welding portion 33 is the molten pool structure formed by welding the adapter 40 and the first terminal portion 31. The first protrusion 311 and the first welding portion 33 are positioned correspondingly, that is, in the same plane perpendicular to the thickness direction Y, the orthographic projection of the first welding portion 33 is located within the orthographic projection of the first protrusion 311. As can be seen from the cross-sectional view, the first welding portion 33 is partially located in the first base 313 and partially located within the first protrusion 311. The arrangement of the first protrusion 311 can meet the thickness requirements for welding the adapter 40 and the first terminal portion 31, reducing the risk of the first welding portion 33 extending into the second terminal portion 32, that is, reducing the risk of dissimilar metal welding, thereby improving welding reliability.

[0128] Similar to the first protrusion 311, the second protrusion 321 is used to meet the welding requirements between the busbar 50 and the second terminal portion 32. Referring to the accompanying drawings, the second weld portion 34 is the molten pool structure formed by welding the busbar 50 and the second terminal portion 32. The second weld portion 34 corresponds to the second protrusion 321, and part of the second weld portion 34 is located in the second base 323, while part is located within the second protrusion 321. The provision of the second protrusion 321 can meet the thickness requirements for welding the busbar 50 and the second terminal portion 32, reducing the risk of the second weld portion 34 extending into the first terminal portion 31, thus reducing the risk of dissimilar metal welding and improving welding reliability.

[0129] Furthermore, at least a portion of the first protrusion 311 is accommodated in the second recess 322, and at least a portion of the second protrusion 321 is accommodated in the first recess 312. This accommodation effect of the first recess 312 on the second protrusion 321 helps to reduce the impact of the presence of the second protrusion 321 on the overall thickness of the electrode terminal 30, thus reducing the overall thickness of the electrode terminal 30. Similarly, the accommodation effect of the second recess 322 on the first protrusion 311 helps to reduce the impact of the presence of the first protrusion 311 on the overall thickness of the electrode terminal 30, thus reducing the overall thickness of the electrode terminal 30.

[0130] It should be noted that the dimension of the first protrusion 311 in the thickness direction Y can be less than or equal to the dimension of the second recess 322 in the thickness direction Y, so that the first protrusion 311 is completely accommodated within the second recess 322. Alternatively, the dimension of the first protrusion 311 in the thickness direction Y can also be greater than the dimension of the second recess 322 in the thickness direction Y, so that the first protrusion 311 is only partially located within the second recess 322. Optionally, as... Figure 6 As shown, the dimension of the first protrusion 311 in the thickness direction Y is equal to the dimension of the second recess 322 in the thickness direction Y, so that the first protrusion 311 and the second recess 322 can be perfectly assembled. The relationship between the second protrusion 321 and the first recess 312 is similar, and will not be described again in the embodiments of this application.

[0131] In summary, in this embodiment, the two terminal portions of the electrode terminal 30 are not designed with overall thickening, but rather with local thickening and local thinning. In this design, the electrode terminal 30 has a first protrusion 311 and a second recess 322 at the locations where it needs to be welded to the adapter 40. The first protrusion 311 meets the welding requirements, and the second recess 322 accommodates the first protrusion 311 to reduce the overall thickness of the electrode terminal 30. Similarly, a second protrusion 321 and a first recess 312 are provided at the locations where it needs to be welded to the busbar 50. The second protrusion 321 meets the welding requirements, and the first recess 312 accommodates the second protrusion 321 to reduce the overall thickness of the electrode terminal 30. This design can reduce the thickness of the electrode terminal 30 while meeting the welding requirements, thereby reducing the overall size of the battery cell 500 in the thickness direction Y and increasing the energy density of the battery cell 500.

[0132] In some embodiments, such as Figures 4 to 6 As shown, the first terminal portion 31 is located outside the wall portion 11, and a portion of the adapter 40 is accommodated in the through hole 12.

[0133] Since the first terminal portion 31 is located outside the wall portion 11 and the second terminal portion 32 is located on the side of the first terminal portion 31 away from the main body portion 21, both the first terminal portion 31 and the second terminal portion 32 are located outside the wall portion 11, meaning that the electrode terminal 30 will not penetrate into the interior of the outer casing 10.

[0134] A portion of the adapter 40 is accommodated in the through hole 12 for connection to the electrode terminal 30. Another portion of the adapter 40 may be located on the side of the wall portion 11 near the main body portion 21 for connection to the tab 22. The portion of the adapter 40 accommodated in the through hole 12 and the first terminal portion 31 are welded to form a first weld portion 33. The welding method used can be butt welding. Specifically, the wall of the through hole 12 and the portion of the adapter 40 accommodated in the through hole 12 can be heated by laser or other means, so that the portion of the first terminal portion 31 and the adapter 40 in contact melts and fuses together. After the fused portion solidifies, it forms the first weld portion 33.

[0135] In this embodiment, the first terminal portion 31 is located outside the wall portion 11, that is, the electrode terminal 30 does not penetrate into the interior of the housing 10. In this way, the assembly between the electrode assembly 20 and the housing 10 will not be affected by the interference of the electrode terminal 30. This design can reduce the space occupied by the electrode terminal 30 in the interior of the housing 10, which is beneficial to increase the size of the electrode assembly 20 and increase the capacity of the battery cell 500 in a limited space.

[0136] In some embodiments, such as Figures 4 to 6 As shown, the battery cell 500 also includes a fixing member 60, which includes a limiting part and a fixing part connected to each other. The limiting part is located on the side of the wall portion 11 away from the main body portion 21, along the thickness direction Y of the wall portion 11. A portion of the first terminal portion 31 is located between the limiting part and the wall portion 11, and the fixing part is connected to the wall portion 11.

[0137] The fixing member 60 can be used to limit and fix the electrode terminal 30 relative to the wall portion 11. The fixing member 60 includes a limiting part and a fixing part. The limiting part can be provided around a portion of the electrode terminal 30. The fixing part can be bent or extended from the limiting part in a direction close to the wall portion 11. In the same plane perpendicular to the thickness direction Y, the orthographic projection of the fixing part can be located on the outer periphery of the orthographic projection of the electrode terminal 30.

[0138] Along the thickness direction Y, a portion of the first terminal portion 31 is located between the limiting portion and the wall portion 11. The wall portion 11 can provide support for the first terminal portion 31 so that the first terminal portion 31 is located outside the housing 10. The limiting portion can apply a force toward the wall portion 11 to the first terminal portion 31, which is beneficial to press the first terminal portion 31 against the wall portion 11, realize the assembly of the electrode terminal 30 and the wall portion 11, and also improve the sealing performance of the battery cell 500.

[0139] In some alternative embodiments, a portion of the second terminal portion 32 is also located between the limiting portion and the wall portion 11. This limiting can apply a force toward the wall portion 11 to the second terminal portion 32, which is beneficial to press the second terminal portion 32 against the wall portion 11 and further improve the limiting fixation between the electrode terminal 30 and the wall portion 11.

[0140] The fixing part and the limiting part can be connected in various ways. For example, the fixing part can be connected to the wall part 11 by welding, bonding or other suitable means, and fixed relative to the wall part 11. Optionally, the limiting part and the fixing part can be an integrally formed structure.

[0141] The fastener 60 can be made of metal to improve its structural strength, thereby enhancing the connection strength and stability between the fastener and the wall 11, as well as the limiting effect of the limiting part on the electrode terminal 30. In some cases, the limiting part can directly abut against the electrode terminal 30 along the thickness direction Y, and the wall 11 can be electrically connected to the electrode terminal 30 through the fastener 60, thus making the wall 11 energized. Alternatively, in other cases, an insulating part 70 can be provided between the limiting part and the electrode terminal 30 along the thickness direction Y. The limiting part can be indirectly pressed against the electrode terminal 30 through the insulating part 70, and the fastener 60 can be insulated from the electrode terminal 30 through the insulating part 70.

[0142] In this embodiment, the electrode terminal 30 is disposed on the wall portion 11 by the fixing member 60, which helps to simplify the assembly of the first electrode terminal 30. Furthermore, the electrode terminal 30 can be disposed as a whole on the side of the wall portion 11 away from the main body portion 21, which can reduce the internal space occupied by the outer casing 10 and help to increase the size of the electrode assembly 20 and increase the capacity of the battery cell 500 within a limited space.

[0143] In some embodiments, please refer to Figures 4 to 8 The first protrusion 311 surrounds the second protrusion 321; or, the second protrusion 321 surrounds the first protrusion 311.

[0144] As can be seen from the foregoing, the first recess 312 and the first protrusion 311 can have various positional relationships, as can the second recess 322 and the second protrusion 321. Furthermore, the first protrusion 311 is at least partially accommodated within the second recess 322, and the second protrusion 321 is at least partially accommodated within the first recess 312. Based on this, the first protrusion 311 and the second protrusion 321 can have various positional configurations.

[0145] like Figure 5 and Figure 6As shown, the second protrusion 321 can be disposed around the first protrusion 311. In this case, the first recess 312 is disposed around the first protrusion 311, and the second protrusion 321 is disposed around the second recess 322. The first weld portion 33 formed by welding the adapter piece to the first terminal portion 31 is located in the central region of the electrode terminal 30, while the second weld portion 34 formed by welding the bus member 50 to the second terminal portion 32 is located in the edge region of the electrode terminal 30.

[0146] like Figure 7 and Figure 8 As shown, the first protrusion 311 can also be provided around the second protrusion 321. In this case, the first protrusion 311 is provided around the first recess 312, and the second recess 322 is provided around the second protrusion 321. The first welded portion 33, formed by welding the adapter piece to the first terminal portion 31, is located at the edge region of the electrode terminal 30, while the second welded portion 34, formed by welding the bus member 50 to the second terminal portion 32, is located at the central region of the electrode terminal 30.

[0147] It should be noted that, taking the second protrusion 321 surrounding the first protrusion 311 as an example, the figure illustrates the case where the orthographic center of the first protrusion 311 coincides with the orthographic center of the electrode terminal 30 in the same plane perpendicular to the thickness direction Y. In this case, the first protrusion 311 and the first welding portion 33 are completely located in the central region of the electrode terminal 30, while the second protrusion 321 and the second welding portion 34 are completely located in the edge region of the electrode terminal 30. However, in other cases, the orthographic projection of the first protrusion 311 may also be completely located on one side of the orthographic center of the electrode terminal 30. In this case, a portion of the second protrusion 321 is parallel to the first protrusion 311 and located in the central region of the electrode terminal 30 together with the first protrusion 311, while another portion is located in the edge region of the electrode terminal 30. Based on this, the second welding portion 34 may be located within the portion of the second protrusion 321 located in the central region of the electrode terminal 30, or it may be located within the portion of the second protrusion 321 located in the edge region of the electrode terminal 30.

[0148] In this embodiment, by providing the first protrusion 311 around the second protrusion 321, or by providing the second protrusion 321 around the first protrusion 311, the orthographic projections of the first welding portion 33 and the second welding portion 34 can be misaligned in the same plane perpendicular to the thickness direction Y. This helps to reduce the risk of excessive thickness of the electrode terminal 30 caused by the first welding portion 33 and the second welding portion 34 being concentrated in the same area of ​​the electrode terminal 30, thereby reducing the overall size of the battery cell 500 in the thickness direction Y and increasing the energy density of the battery cell 500.

[0149] In some embodiments, such as Figure 6 and Figure 8 As shown, the second terminal portion 32 has a third recess 324 on the side opposite to the first terminal portion 31. In the same plane perpendicular to the thickness direction Y of the wall portion 11, the orthographic projection of the third recess 324 at least partially overlaps with the orthographic projection of the first protrusion 311.

[0150] The third recess 324 is a recessed space that realizes the positioning function between the bus member 50 and the electrode terminal 30. The third recess 324 is formed by the side of the second terminal portion 32 that is opposite to the first terminal portion 31. Depending on the design layout and actual needs, the electrode terminal 30 may have only one third recess 324, or the electrode terminal 30 may have multiple third recesses 324 at the same time.

[0151] Furthermore, considering that the positioning area between the busbar 50 and the electrode terminal 30 is often misaligned with the welding area, in this embodiment, the orthographic projection of the third recess 324 is set to at least partially overlap with the orthographic projection of the first protrusion 311 in the same plane perpendicular to the thickness direction Y of the wall portion 11. In this way, the welding area of ​​the busbar 50 and the electrode terminal 30, i.e., the area where the second welding portion 34 is located, can be staggered from the first protrusion 311. This reduces the risk of the electrode terminal 30 being too thick due to the second welding portion 34 being located in the area where the first protrusion 311 is located, reduces the overall size of the battery cell 500 in the thickness direction Y, and increases the energy density of the battery cell 500.

[0152] It should be noted that the third recess 324 and the second protrusion 321 can have various positional relationships. For example, in the same plane perpendicular to the thickness direction Y of the wall portion 11, the orthographic projection of the third recess 324 can be located outside the orthographic projection of the second protrusion 321, or the orthographic projection of the third recess 324 can overlap with both the orthographic projection of the first protrusion 311 and the orthographic projection of the second protrusion 321. As long as the orthographic projection of the third recess 324 and the orthographic projection of the first protrusion 311 at least partially overlap, so that the orthographic projection of the second welded portion 34 is located outside the orthographic projection of the first protrusion 311, it is acceptable.

[0153] In some embodiments, please refer to Figures 7 to 9 The first protrusion 311 is arranged around the second protrusion 321, and there are multiple third recesses 324. In the same plane perpendicular to the thickness direction Y, the orthographic projections of the multiple third recesses 324 are distributed at intervals around the orthographic projection of the first recess 312.

[0154] by Figure 7 Taking the structure shown as an example, the first welded part 33 formed by welding the adapter 40 to the first terminal part 31 is located in the edge region of the electrode terminal 30, while the second welded part 34 formed by welding the busbar 50 to the second terminal part 32 is located in the central region of the electrode terminal 30.

[0155] In related technologies, the positioning areas of the busbar 50 and the electrode terminal 30 are typically located in the central region of the electrode terminal 30. However, in this embodiment, since the second welding portion 34 is located in the central region of the electrode terminal 30, the position of the third recess 324 is adjusted. The third recess 324 is positioned at the edge of the electrode terminal 30 to meet the positional avoidance requirement between the third recess 324 and the second welding portion 34. Furthermore, this embodiment also sets the number of third recesses 324 to multiple, with the orthographic projections of the multiple third recesses 324 distributed at intervals around the orthographic projection of the first recess 312. This helps to improve the positioning accuracy of the busbar 50 and the electrode terminal 30, thereby improving the positional reliability of the busbar 50 and the electrode terminal 30.

[0156] In some embodiments, please refer to Figures 10 to 12 The second protrusion 321 is disposed around the first protrusion 311, and the first terminal portion 31 also includes a first base 313. Both the first protrusion 311 and the first recess 312 are located on the side of the first base 313 facing away from the main body portion 21. The second protrusion 321 includes a first portion 321a disposed parallel to the first protrusion 311 in the first direction X, and a second portion 321b surrounding the first protrusion 311 and the first portion 321a. Figure 12 The dividing line between the first part 321a and the second part 321b is indicated by a dashed line.

[0157] As can be seen from the accompanying drawings, although the second protrusion 321 surrounds the first protrusion 311, the second protrusion 321 is not entirely located at the edge region of the electrode terminal 30. Specifically, the second protrusion 321 includes a first portion 321a and a second portion 321b, which can be an integral structure. The first portion 321a is arranged side-by-side with the first protrusion 311 in the first direction X, and both the first portion 321a and the first protrusion 311 are located in the central region of the electrode terminal 30. The second portion 321b is located in the edge region of the electrode terminal 30, and the second portion 321b surrounds both the first protrusion 311 and the first portion 321a. Optionally, in the same plane perpendicular to the thickness direction Y, the orthographic projection of the first portion 321a and the orthographic projection of the first protrusion 311 are located on opposite sides of the center of the electrode terminal 30.

[0158] In this embodiment, since the first portion 321a of the first protrusion 311 and the second protrusion 321 can be located in the central region of the electrode terminal 30, and the first welding portion 33 can be located within the first protrusion 311, and the second welding portion 34 can be located within the first portion 321a, the first welding portion 33 and the second welding portion 34 can be staggered and both correspondingly disposed in the central region of the electrode terminal 30. This reduces the adverse effects of the formation process of the first welding portion 33 and the second welding portion 34 on the fixing member 60 and the insulating member 70 located on the outer periphery of the electrode terminal 30, thereby improving the product yield.

[0159] In some alternative embodiments, the orthographic projection of the third recess 324 overlaps with the orthographic projections of both the first protrusion 311 and the second protrusion 321 in the same plane perpendicular to the thickness direction Y. In other words, the orthographic projection of the third recess 324 may overlap with the center of the electrode terminal 30.

[0160] In this embodiment, although the first welding portion 33 and the second welding portion 34 are both located in the central region of the electrode terminal 30, the first welding portion 33 and the second welding portion 34 are respectively located on both sides of the center of the electrode terminal 30. Based on this, even if the orthographic projection of the third recess 324 overlaps with the orthographic projection of the second protrusion 321, the third recess 324 is correspondingly located to the center of the electrode terminal 30, so the need for staggered distribution between the third recess 324 and the second welding portion 34 can still be met, thereby taking into account the welding and positioning requirements between the busbar 50 and the electrode terminal 30.

[0161] In some embodiments, the first terminal portion 31 includes a first base 313, with a first protrusion 311 and a first recess 312 both located on the side of the first base 313 facing away from the main body portion 21. The second terminal portion 32 includes a second base 323, with a second protrusion 321 and a second recess 322 both located on the side of the second base 323 facing the main body portion 21, and the thickness of the second base 323 is greater than the thickness of the first base 313.

[0162] The first base 313 and the first protrusion 311 can be an integral structure, and the first welded part 33 is partially located within the first base 313 and partially located within the first protrusion 311. The second base 323 and the second protrusion 321 can be an integral structure, and the second welded part 34 is partially located within the second base 323 and partially located within the second protrusion 321.

[0163] As can be seen from the content, the first terminal portion 31 and the second terminal portion 32 include different base materials. The base material of the first terminal portion 31 may include metallic copper, and the base material of the second terminal portion 32 may include metallic aluminum.

[0164] Furthermore, in this embodiment, considering that the melting point of aluminum is often lower than that of copper, under the same welding conditions, the dimension of the first weld portion 33 in the thickness direction Y is often larger than that of the second weld portion 34 in the thickness direction Y. Based on this, since the first protrusion 311 and the second protrusion 321 typically have the same dimension in the thickness direction Y, in order to meet the respective dimensional requirements of the first weld portion 33 and the second weld portion 34, this embodiment sets the thickness of the second substrate 323 to be greater than the thickness of the first substrate 313. This reduces the risk of the second weld portion 34 penetrating into the first terminal portion 31, thereby improving welding reliability. In addition, this design of setting different substrate thicknesses according to different base metals also helps to reduce the manufacturing difficulty of the electrode terminal 30.

[0165] In some embodiments, such as Figure 6 As shown, in the thickness direction Y of the wall portion 11, the sum of the dimensions of the first protrusion 311 and the first base 313 is H1, the dimension of the first base 313 is H2, the sum of the dimensions of the second protrusion 321 and the second base 323 is H3, the dimension of the second base 323 is H4, and 2.5mm≥H3>H1≥1.3mm≥H4>H2≥0.5mm.

[0166] The first weld portion 33 is partially located within the first base 313 and partially within the first protrusion 311. The second weld portion 34 is partially located within the second base 323 and partially within the second protrusion 321. Based on this, in this embodiment, H3 is set to be not less than 1.3 mm, and H1 > H3, thereby satisfying the formation requirements of the first weld portion 33 and the second weld portion 34 and reducing the risk of the first weld portion 33 extending into the second terminal portion 32 and the second weld portion 34 extending into the first terminal portion 31. Simultaneously, in this embodiment, H3 is set to be not greater than 2.5 mm, thereby reducing the adverse effect on the overall thickness of the electrode terminal 30 due to the excessive size of the first protrusion 311 and the second protrusion 321 in the thickness direction Y, which helps to reduce the overall size of the battery cell 500 in the thickness direction Y and improve the energy density of the battery cell 500. Optionally, H1 is one of 1.3 mm, 1.5 mm, 1.6 mm, 1.8 mm, and 2 mm. H3 is one of 1.5mm, 1.8mm, 2mm, 2.2mm, and 2.5mm.

[0167] Furthermore, in this embodiment, H2 and H4 are set to H4 > H2 to satisfy the requirement that H1 > H3, thereby better matching the size requirements of the first welding part 33 and the second welding part 34. H2 is set to be not less than 0.5mm so that the first substrate 313 and the second substrate 323 can have a certain thickness, improving the overall structural reliability of the electrode terminal 30. At the same time, H4 is set to be not greater than 1.3mm to reduce the adverse effect on the overall thickness of the electrode terminal 30, which helps to reduce the overall size of the battery cell 500 in the thickness direction Y and improve the energy density of the battery cell 500. Optionally, H2 is one of 0.5mm, 0.6mm, 0.8mm, 0.9mm, and 1mm. H4 is one of 0.8mm, 1mm, 1.2mm, 1.4mm, and 1.5mm.

[0168] In some embodiments, in the thickness direction Y of the wall portion 11, the sum of the dimensions of the first protrusion 311 and the first base 313 is H1, and the sum of the dimensions of the second protrusion 321 and the second base 323 is H3, where 3 ≥ H3 / H1 ≥ 2. Optionally, H3 / H1 is one of 2, 2.2, 2.5, 2.8, and 3.

[0169] In this embodiment, setting H3 / H2 to not less than 2 helps to increase the dimensions of the second protrusion 321 and the second base 323, as well as the size of H3, thereby better matching the formation requirements of the first welding portion 33 and the second welding portion 34. Simultaneously, setting H3 / H2 to not greater than 3 helps to reduce the risk of excessive thickness of the electrode terminal 30 due to an excessively large H3 size, thus helping to reduce the overall size of the battery cell 500 in the thickness direction Y and increasing the energy density of the battery cell 500.

[0170] In some embodiments, the second terminal portion 32 includes a second base 323, and both the second protrusion 321 and the second recess 322 are located on the side of the second base 323 facing the main body portion 21. In the thickness direction Y, the dimension of the first base 313 is H2, and the sum of the dimensions of the second protrusion 321 and the second base 323 is H3, where 5 ≥ H3 / H2 ≥ 1.5. Optionally, H3 / H2 is one of 1.5, 2, 3, 4, and 5.

[0171] In this embodiment, by setting H3 / H2 to not less than 1.5, the dimensions of the second protrusion 321 and the second base 323, as well as the size of H3, are increased to meet the formation requirements of the second welding portion 34. Simultaneously, setting H3 / H2 to not greater than 5 allows the first base 313 to have a certain thickness, thereby meeting the fabrication requirements of the first terminal portion 31 and the load-bearing requirements of the first base 313 on the second terminal portion 32.

[0172] In some embodiments, the first terminal portion 31 includes a first base 313, with a first protrusion 311 and a first recess 312 both located on the side of the first base 313 facing away from the main body portion 21. In the thickness direction Y, the sum of the dimensions of the first protrusion 311 and the first base 313 is H1, and the dimension of the second base 323 is H4, where 5 ≥ H1 / H4 ≥ 1. Optionally, H4 / H1 is one of 1, 2, 3, 4, and 5.

[0173] In this embodiment, by setting H1 / H4 to not less than 1, the dimensions of the first protrusion 311 and the first base 313, as well as the size of H1, are increased to meet the formation requirements of the first welding portion 33. Simultaneously, setting H1 / H4 to not greater than 5 allows the second base 323 to have a certain thickness, thereby meeting the fabrication requirements of the second terminal portion 32.

[0174] Secondly, this application provides a battery device 100, which includes a busbar 50 and a battery cell 500 as described in any of the preceding embodiments. The busbar 50 is welded to a second terminal portion 32 and a second weld portion 34 is formed at a second protrusion 321.

[0175] It should be noted that the battery device 100 provided in this application embodiment has the beneficial effects of the battery cell 500 in any of the aforementioned embodiments. For details, please refer to the aforementioned description of the beneficial effects of the battery cell 500. This application embodiment will not repeat the description.

[0176] In this embodiment, the two terminal portions of the electrode terminal 30 are not designed with overall thickening, but rather with local thickening and local thinning. In this design, a first protrusion 311 and a second recess 322 are provided at the location where the first welding portion 33 is formed. The first protrusion 311 meets the welding requirements, and the second recess 322 accommodates the first protrusion 311 to reduce the overall thickness of the electrode terminal 30. Similarly, a second protrusion 321 and a first recess 312 are provided at the location where the second welding portion 34 is to be formed. The second protrusion 321 meets the welding requirements, and the first recess 312 accommodates the second protrusion 321 to reduce the overall thickness of the electrode terminal 30. This design can reduce the thickness of the electrode terminal 30 while meeting the welding requirements, thereby reducing the overall size of the battery cell 500 in the thickness direction Y and increasing the energy density of the battery cell 500.

[0177] In some embodiments, the first weld portion 33 and the second weld portion 34 overlap in a direction perpendicular to the thickness direction Y of the wall portion 11.

[0178] Referring to the accompanying drawings, the first direction X is a direction perpendicular to the thickness direction Y. The overlap mentioned in this embodiment refers to the overlap between the projection of the first welding part 33 in the first direction X and the projection of the second welding part 34 in the first direction X. In other words, in the same plane perpendicular to the first direction X, there is an overlapping area between the overall orthographic projection of the first welding part 33 and the orthographic projection of the second welding part 34.

[0179] In this embodiment, the structure of the electrode terminal 30 is adjusted so that the orthographic projections of the first welding portion 33 and the second welding portion 34 are staggered in the same plane perpendicular to the thickness direction Y. Furthermore, the first welding portion 33 and the second welding portion 34 can overlap in the direction perpendicular to the thickness direction Y of the wall portion 11. This allows the first welding portion 33 and the second welding portion 34 to share the same height space of the electrode terminal 30 in the thickness direction Y, thereby reducing the overall thickness of the electrode terminal 30 and consequently reducing the overall size of the battery cell 500 in the thickness direction Y, thus increasing the energy density of the battery cell 500.

[0180] Thirdly, embodiments of this application provide an electrical device, which includes the battery device 100 in any of the foregoing embodiments.

[0181] According to some embodiments of this application, please refer to Figures 4 to 6 The battery device 100 includes a current-collecting component 50 and a battery cell 500. The battery cell 500 includes a housing 10, an electrode assembly 20, an electrode terminal 30, and an adapter 40. The housing 10 includes a wall portion 11 with a through hole 12. The electrode assembly 20 is disposed inside the housing 10 and includes a main body portion 21 and a tab 22 extending from the main body portion 21.

[0182] The electrode terminal 30 is at least partially located on the side of the wall portion 11 away from the main body portion 21. The electrode terminal 30 includes a first terminal portion 31 and a second terminal portion 32. The second terminal portion 32 is disposed on the side of the first terminal portion 31 facing north towards the main body portion 21. The side of the first terminal portion 31 facing the second terminal portion 32 is provided with a first protrusion 311 and a first recess 312 arranged side by side. The side of the second terminal portion 32 facing the first terminal portion 31 is provided with a second protrusion 321 and a second recess 322 arranged side by side. The first protrusion 311 is at least partially accommodated in the second recess 322, and the second protrusion 321 is at least partially accommodated in the first recess 312.

[0183] The adapter 40 is connected to the tab 22 and is welded to the first terminal portion 31 to form a first weld portion 33. A first portion of the first weld portion 33 is formed on the first protrusion 311. The bus member 50 is welded to the second terminal portion 32 and a second weld portion 34 is formed at the second protrusion 321. The first weld portion 33 and the second weld portion 34 overlap in the direction perpendicular to the thickness direction Y of the wall portion 11. The base metal of the first terminal portion 31 is different from the base metal of the second terminal portion 32, while the base metal of the adapter 40 is the same as the base metal of the first terminal portion 31.

[0184] The second protrusion 321 is disposed around the first protrusion 311. The second terminal portion 32 has a third recess 324 on the side opposite to the first terminal portion 31. In the same plane perpendicular to the thickness direction Y of the wall portion 11, the orthographic projection of the third recess 324 at least partially overlaps with the orthographic projection of the first protrusion 311. The first terminal portion 31 includes a first base 313, and both the first protrusion 311 and the first recess 312 are located on the side of the first base 313 opposite to the main body portion 21. The second terminal portion 32 includes a second base 323, and both the second protrusion 321 and the second recess 322 are located on the side of the second base 323 facing the main body portion 21. The thickness of the second base 323 is greater than the thickness of the first base 313.

[0185] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing includes a wall portion, wherein the wall portion is provided with a through hole; An electrode assembly is disposed within the housing, the electrode assembly including a main body and tabs extending from the main body; An electrode terminal is at least partially located on the side of the wall portion facing away from the main body portion. The electrode terminal includes a first terminal portion and a second terminal portion. The second terminal portion is disposed on the side of the first terminal portion facing away from the main body portion. The side of the first terminal portion facing the second terminal portion has a first protrusion and a first recess arranged side by side. The side of the second terminal portion facing the first terminal portion has a second protrusion and a second recess arranged side by side. At least a portion of the first protrusion is accommodated in the second recess, and at least a portion of the second protrusion is accommodated in the first recess. An adapter is connected to the electrode tab, the adapter is welded to the first terminal portion to form a first weld portion, and a portion of the first weld portion is formed on the first protrusion; The base metal of the first terminal portion is different from the base metal of the second terminal portion, while the base metal of the adapter is the same as the base metal of the first terminal portion.

2. The battery cell according to claim 1, characterized in that, The first terminal portion is located on the outside of the wall portion, and a portion of the adapter is accommodated in the through hole.

3. The battery cell according to claim 1, characterized in that, The battery cell also includes a fixing member, which includes a limiting part and a fixing part connected to each other. The limiting part is located on the side of the wall portion away from the main body portion along the thickness direction of the wall portion. A portion of the first terminal portion is located between the limiting part and the wall portion. The fixing part is connected to the wall portion.

4. The battery cell according to claim 1, characterized in that, The first protrusion surrounds the second protrusion; or, the second protrusion surrounds the first protrusion.

5. The battery cell according to claim 4, characterized in that, The second terminal portion has a third recess on the side opposite to the first terminal portion. In the same plane perpendicular to the thickness direction of the wall portion, the orthographic projection of the third recess and the orthographic projection of the first protrusion overlap at least partially.

6. The battery cell according to claim 5, characterized in that, The first protrusion surrounds the second protrusion, and there are multiple third recesses. In the same plane perpendicular to the thickness direction, the orthographic projections of the multiple third recesses are distributed at intervals around the orthographic projection of the first recess.

7. The battery cell according to claim 4, characterized in that, The second protrusion is disposed around the first protrusion, and the first terminal portion further includes a first base. Both the first protrusion and the first recess are located on the side of the first base away from the main body portion. The second protrusion includes a first portion arranged side-by-side with the first protrusion in a first direction, and a second portion surrounding the first protrusion and the first portion.

8. The battery cell according to any one of claims 1 to 7, characterized in that, The first terminal portion includes a first base, and both the first protrusion and the first recess are located on the side of the first base away from the main body portion; The second terminal portion includes a second base, and the second protrusion and the second recess are both located on the side of the second base facing the main body portion. The thickness of the second base is greater than the thickness of the first base.

9. The battery cell according to claim 8, characterized in that, In the thickness direction of the wall portion, the sum of the dimensions of the first protrusion and the first base is H1, the dimension of the first base is H2, the sum of the dimensions of the second protrusion and the second base is H3, the dimension of the second base is H4, and 2.5mm ≥ H3 > H1 ≥ 1.3mm ≥ H4 > H2 ≥ 0.5mm.

10. The battery cell according to claim 8, characterized in that, In the thickness direction of the wall portion, the sum of the dimensions of the first protrusion and the first base is H1, and the sum of the dimensions of the second protrusion and the second base is H3, where 3≥H3 / H1≥2.

11. The battery cell of any one of claims 1 to 10, wherein, The first terminal portion includes a first base, and the first protrusion and the first recess are both located on the side of the first base away from the main body portion. The second terminal portion includes a second base, and the second protrusion and the second recess are both located on the side of the second base facing the main body portion. In the thickness direction of the wall portion, the size of the first base is H2, and the sum of the sizes of the second protrusion and the second base is H3, where 5 ≥ H3 / H2 ≥ 1.

5.

12. The battery cell of any one of claims 1 to 11, wherein, The first terminal portion includes a first base, and the first protrusion and the first recess are both located on the side of the first base away from the main body portion. The second terminal portion includes a second base, and the second protrusion and the second recess are both located on the side of the second base facing the main body portion. In the thickness direction of the wall portion, the sum of the dimensions of the first protrusion and the first base is H1, the dimension of the second base is H4, and 5≥H1 / H4≥1.

13. A battery device characterized by comprising: It includes a busbar component and a battery cell as described in any one of claims 1-12, wherein the busbar component is welded to the second terminal portion and a second weld portion is formed at the second protrusion.

14. The battery device of claim 13, wherein, In a direction perpendicular to the thickness direction of the wall portion, the first weld portion overlaps with the second weld portion.

15. An electrical device, comprising: Includes the battery device as described in any one of claims 13 and 14.

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