Battery cell, battery, and electric device

Abstract

The application discloses a battery cell, a battery and a power utilization device. The battery cell comprises a shell, an electrode terminal and a blocking piece. The electrode terminal has a groove part arranged in an axial direction, the groove part comprises a first groove section and a second groove section, the first groove section is located at one end of the second groove section away from the inside of the shell, the first groove section is located in a flange part, the second groove section is at least partially located in the flange part, the radial dimension of the first groove section is greater than the radial dimension of the second groove section, and an annular mesa is formed at the connection part of the first groove section and the second groove section. The blocking piece is used for blocking the groove part, the blocking piece comprises a body part and a guide part, the body part is arranged in the first groove section and supported on the annular mesa, the guide part is arranged in the second groove section, the blocking piece is fixedly connected with the electrode terminal, and the battery cell is electrically connected with the outside through the blocking piece. In the above manner, the connection effect of the blocking piece and the electrode terminal can be improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and in particular to battery cells, batteries, and electrical devices. Background Technology

[0002] With the development of battery technology, battery cells are being applied in more and more fields, gradually replacing traditional fossil fuels in the automotive power sector. Battery cells can store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, the active materials can be reactivated through charging after discharge, allowing for continued use.

[0003] A battery cell typically includes electrode assemblies, electrode terminals, sealing components, and a housing. The housing accommodates the electrode assemblies. The electrode assemblies are electrically connected to the outside environment via the electrode terminals. The sealing components seal the recesses of the electrode terminals and connect to the electrode terminals. The electrode terminals are also electrically connected to the outside environment via the sealing components. In existing battery cell structures, the area available for supporting the sealing components at the electrode terminals is relatively small, which hinders the connection between the electrode terminals and the sealing components during assembly, thus affecting the connection effectiveness between the sealing components and the electrode terminals. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery, and an electrical device that can increase the mating area between the body of the sealing member and the electrode terminal, while maintaining sufficient connection strength between the flange and the insertion part, thereby improving the connection effect between the sealing member and the electrode terminal.

[0005] In a first aspect, this application provides a battery cell, which includes a housing, electrode terminals, and a sealing member. The housing includes a wall portion with an outlet hole; the electrode terminal includes an insertion portion and a flange portion connected to each other along the axial direction of the electrode terminal, the insertion portion being disposed within the outlet hole, the flange portion being located on the side of the insertion portion away from the interior of the housing, and the flange portion extending at least partially beyond the insertion portion in the radial direction of the electrode terminal; the electrode terminal has a groove portion disposed along the axial direction, the groove portion including a first groove segment and a second groove segment, the first groove segment being located at the end of the second groove segment away from the interior of the housing, the first groove segment being located within the flange portion, the second groove segment being at least partially located within the flange portion, the radial dimension of the first groove segment being larger than the radial dimension of the second groove segment, thereby forming an annular platform at the connection between the first groove segment and the second groove segment; the sealing member is used to seal the groove portion, the sealing member including a body portion and a guide portion, the body portion being disposed within the first groove segment and supported on the annular platform, the guide portion being disposed within the second groove segment, the sealing member being fixedly connected to the electrode terminal, and the battery cell being electrically connected to the outside through the sealing member.

[0006] By providing a first and second groove segment on the flange of the electrode terminal, and setting the radial dimension of the first groove segment to be larger than that of the second groove segment, the larger radial dimension of the first groove segment increases the mating area between the body of the sealing component and the electrode terminal. Simultaneously, the smaller radial dimension of the second groove segment helps reduce damage to the electrode terminal caused by insufficient connection strength between the flange and the insertion portion, thereby improving the connection effect between the sealing component and the electrode terminal. Furthermore, by providing the first groove segment, the axial dimension of the battery cell can be reduced, and the body segment within the first groove segment can act as a limit, reducing the risk of the sealing component slipping out of the groove during assembly.

[0007] In some embodiments, the outer end face of the body portion facing away from the interior of the housing protrudes from the outer end face of the flange portion facing away from the interior of the housing, and the body portion is welded and fixed to the flange portion.

[0008] The above method allows welding energy to be applied more directly to the body, reducing the adverse effects of welding energy on the outer end face of the flange that is away from the shell.

[0009] In some embodiments, the battery cell includes an insulating member surrounding the periphery of the electrode terminal and located between the electrode terminal and the wall portion, wherein the electrode terminal, the sealing member, and the insulating member are configured such that welding energy reflected from the outer peripheral surface of the body portion relative to the protruding portion of the flange portion and transmitted to the insulating member is blocked by the outer end surface of the flange portion.

[0010] The above methods can reduce the adverse effects of welding energy on insulating components.

[0011] In some embodiments, the outer end face of the flange protrudes beyond the outer end face of the insulating member away from the interior of the housing, and satisfies the following relationship:

[0012] arctan(H5 / ((D4-D3) / 2))>arctan((H3-H2) / ((D3-D2) / 2)),

[0013] Wherein, H5 is the protrusion height of the outer end face of the flange relative to the outer end face of the insulator, D4 is the radial dimension of the outer end face of the insulator, D3 is the radial dimension of the outer end face of the flange, H3 is the axial thickness of the body portion located in the first groove segment, H2 is the axial depth of the first groove segment, and D2 is the radial dimension of the outer end face of the body portion.

[0014] By using the above methods and reasonably setting the dimensional parameters of relevant components, the adverse effects of welding energy on insulating parts can be reduced.

[0015] In some embodiments, the axial projection height of the outer end face of the body relative to the outer end face of the flange is greater than or equal to 0.1 mm.

[0016] The above method allows welding energy to be applied more easily and directly to the body, while reducing the adverse effects of welding energy on the outer end face of the flange that is away from the inner surface of the outer shell.

[0017] In some embodiments, the axial thickness of the body portion located within the first groove segment is less than or equal to 0.5 times the difference between the axial thickness of the flange portion and the axial depth of the first groove segment, and the body portion is welded and fixed to the flange portion.

[0018] The above method can improve the welding strength between the body and the flange.

[0019] In some embodiments, the axial thickness of the body portion located within the first groove is greater than or equal to 0.3 mm, and the axial depth of the first groove is greater than or equal to 0.2 mm.

[0020] By setting the axial thickness of the body portion located in the first groove section to be greater than or equal to 0.3 mm in the above manner, the load-bearing capacity of the body portion can be improved, and the connection strength can be improved when the body portion is connected to the flange portion.

[0021] By setting the axial depth of the first groove section to be greater than or equal to 0.2 mm, the limiting effect of the groove on the sealing component is improved, and on the other hand, the axial size of the battery cell can be reduced.

[0022] In some embodiments, the difference between the radial dimension of the outer end face of the body portion and the radial dimension of the inner ring edge of the annular platform is greater than or equal to 0.3 mm.

[0023] By using the above method, the contact area between the body and the flange can be increased, thereby improving the stability of the flange's support for the body.

[0024] In some embodiments, the outer end face of the body portion away from the interior of the housing includes a central region and a welding area disposed around the central region. The central region is used to connect with an external conductive component, and the welding area is used to weld onto the flange portion.

[0025] In this way, the welding trajectory when the body part and the flange part are welded together can surround the central area, thereby forming a weld mark located in the welding area and surrounding the central area, so that the body part and the flange part are evenly connected and the connection stability is improved.

[0026] In some embodiments, the welded area is recessed toward the interior of the housing relative to the central area.

[0027] By using the above methods, the risk of solder marks protruding from the center area, thereby affecting the connection between the center area and external conductive components, can be reduced.

[0028] In some embodiments, the axial depth of the welded area relative to the central area is greater than or equal to 0.1 mm.

[0029] By using the above methods, the risk of solder marks protruding from the center area and affecting the connection between the center area and external conductive components can be reduced.

[0030] In some embodiments, the radial dimension of the inner ring edge of the welded area is less than or equal to the radial dimension of the inner ring edge of the annular platform.

[0031] The above methods can expand the area of ​​the welding zone, making welding operations easier and improving welding strength.

[0032] In some embodiments, the radial dimension of the first slot segment is less than or equal to the radial dimension of the insertion portion.

[0033] By using the above methods, the risk of damage to the flange due to axial forces can be reduced.

[0034] In some embodiments, the flange portion is integrally formed with the insertion portion and is bent relative to the insertion portion, and the first groove segment is formed by stamping.

[0035] By means of the above method, the transition radius between the flange and the insertion part can be reduced by stamping, which can increase the contact area between the flange and the body part and help the flange to support the body part.

[0036] In some embodiments, the flange portion is integrally formed with the insertion portion, and the electrode terminal includes a sealing portion integrally formed with the insertion portion, the sealing portion sealing the end of the insertion portion facing the inside of the housing to form a groove portion.

[0037] The above method simplifies the manufacturing process of electrode terminals.

[0038] In some embodiments, the groove is used to inject electrolyte into the interior of the housing.

[0039] The above methods can simplify the structural complexity of battery cells and improve the assembly efficiency of battery cells.

[0040] In some embodiments, the sealing portion is provided with an injection hole that connects the interior of the housing with the recessed portion.

[0041] The above method, due to the thinness of the sealing part, facilitates the formation of the injection hole and makes it easier to inject electrolyte.

[0042] In some embodiments, the battery cell further includes a current collector and an electrode assembly disposed inside the housing. The current collector is used to connect the tabs and electrode terminals of the electrode assembly, and the side of the sealing portion opposite to the groove portion is welded to the current collector.

[0043] The above method, by setting up a current collector, facilitates the electrical connection between the electrode terminals and the electrode assembly. Utilizing the thinness of the sealing portion, it is welded to the current collector, allowing for easy electrical connection between the electrode terminals and the current collector from the side of the electrode terminals away from the current collector.

[0044] In some embodiments, the battery cell further includes an electrode assembly, the housing includes a casing and an end cap, one end of the casing has an opening, the end cap closes to the opening, the casing includes a side wall and an end wall, the side wall surrounds the outside of the electrode assembly, the end wall is disposed opposite to the opening, and the wall portion is an end cap or an end wall.

[0045] The above methods can improve the assembly efficiency of individual battery cells.

[0046] In some embodiments, the guide section and the second groove section are respectively configured as frustoconical sections with a cross-section that gradually decreases in the direction toward the interior of the housing.

[0047] In this way, during the assembly of the battery cell, the guide part can be inserted into the second groove section for guidance, which facilitates the insertion of the sealing part into the groove and helps to improve the assembly efficiency of the battery cell.

[0048] In some embodiments, the axial depth of the first groove segment is less than the axial depth of the second groove segment.

[0049] The above method can improve the load-bearing capacity of the connection between the flange and the insertion part.

[0050] Secondly, this application provides a battery including the aforementioned battery cell.

[0051] Thirdly, this application provides an electrical device including the aforementioned battery.

[0052] 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

[0053] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiments below. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0054] Figure 1 This is a schematic diagram of the structure of a vehicle according to one or more embodiments;

[0055] Figure 2 This is an exploded structural diagram of a battery according to one or more embodiments;

[0056] Figure 3 This is a top view of a battery cell according to one or more embodiments;

[0057] Figure 4 for Figure 3 The diagram shows a cross-sectional structure of a single battery cell along the CC section.

[0058] Figure 5 for Figure 4 A schematic diagram showing part A of the battery cell with some parts hidden.

[0059] Figure 6 for Figure 5 A schematic diagram of part B of the shown battery cell;

[0060] Figure 7 for Figure 3 The diagram shows the structure of the electrode terminals.

[0061] Figure 8 This is a schematic diagram showing the structural changes of the electrode terminals during the assembly process;

[0062] Figure 9 This is a schematic flowchart of a method for manufacturing a housing assembly according to one or more embodiments.

[0063] The reference numerals in the detailed embodiments are as follows:

[0064] 1000a vehicles;

[0065] 100A battery; 200A controller; 300A motor;

[0066] 10a Enclosure; 11a First Section; 12a Second Section;

[0067] D1 Radial dimension of the inner ring edge of the annular platform; D2 Radial dimension of the outer end face of the body; D3 Radial dimension of the outer end face of the flange; D4 Radial dimension of the outer end face of the insulator; D5 Radial dimension of the first groove segment; D6 Radial dimension of the second groove segment; D7 Radial dimension of the inner ring edge of the welding area; D8 Radial dimension of the outer peripheral surface of the insertion part; H1 Axial thickness of the flange; H2 Axial depth of the first groove segment; H3 Axial thickness of the body; H4 Depth of the weld area relative to the central area; H5 Protrusion height of the outer end face of the flange relative to the outer end face of the insulator; H6 Axial depth of the second groove segment; 221 Outer end face of the flange; 311 Outer peripheral surface of the body relative to the protruding portion of the flange; 601 Outer end face of the insulator facing away from the interior of the shell.

[0068] 1. Battery cell; 100b. Housing assembly; 100. Housing; 101. Wall; 102. Lead-out hole; 110. Housing; 111. Opening; 112. Side wall; 113. End wall; 120. End cap; 200. Electrode terminal; 210. Insertion part; 220. Flange part; 230. Groove part; 231. First groove segment; 232. Second groove segment; 233. Annular platform; 240. Sealing part; 241. Injection hole; 250. Limiting flange; 260. Initial groove segment; 270. Transition fillet; 300. Sealing component; 310. Body part; 312. Central area; 313. Welding area; 320. Guide part; 400. Current collector; 500. Electrode assembly; 501. Tab; 600. Insulator; 801. Solder mark. Detailed Implementation

[0069] 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.

[0070] 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.

[0071] 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.

[0072] 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.

[0073] 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.

[0074] 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).

[0075] 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.

[0076] 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.

[0077] With the development of battery technology, battery cells are being applied in more and more fields, gradually replacing traditional fossil fuels in the automotive power sector. Battery cells can store chemical energy and controllably convert it into electrical energy. In recyclable battery cells, the active materials can be reactivated through charging after discharge, allowing for continued use.

[0078] A single battery cell typically includes electrode assemblies, electrode terminals, sealing components, and a housing. The housing accommodates the electrode assemblies. The electrode assemblies are electrically connected to the outside environment via the electrode terminals. The sealing components seal the recesses of the electrode terminals and connect to them. The electrode terminals are also electrically connected to the outside environment via the sealing components. In existing battery cell structures, the mating area between the electrode terminals and the sealing components is relatively small, which hinders the connection between the electrode terminals and the sealing components during assembly, thus affecting the connection effectiveness between the sealing components and the electrode terminals.

[0079] To improve the connection between the sealing component and the electrode terminal, the electrode terminal can be configured to include an insertion portion and a flange portion connected to each other along the axial direction of the electrode terminal. The flange portion is located on the side of the insertion portion away from the interior of the housing, and in the radial direction of the electrode terminal, the flange portion at least partially extends beyond the insertion portion. The electrode terminal has a groove portion arranged axially, the groove portion including a first groove segment and a second groove segment. The first groove segment is located at the end of the second groove segment away from the interior of the housing, the first groove segment is located within the flange portion, and the second groove segment is at least partially located within the flange portion. The radial dimension of the first groove segment is larger than the radial dimension of the second groove segment, thereby forming an annular platform at the connection between the first groove segment and the second groove segment. The sealing component can be configured to include a body portion and a guide portion. The body portion is located within the first groove segment and supported on the annular platform, and the guide portion is located within the second groove segment.

[0080] Based on the above considerations, this application provides a method for manufacturing a battery cell and a housing assembly, a battery, and an electrical device. By providing an annular platform for the body portion to abut, the mating area between the flange portion and the body portion can be increased, improving the stability of the sealing member and the electrode terminal during assembly. By providing a first groove, the axial dimension of the battery cell at the electrode terminal can be reduced, and the body portion can also act as a limit within the first groove to reduce the risk of the sealing member sliding out of the recess during assembly. Thus, the connection effect between the sealing member and the electrode terminal can be improved.

[0081] The battery cell, casing assembly manufacturing method, battery, and electrical device disclosed in this application can be used in electrical devices that use batteries as a power source or in various energy storage systems that use batteries as energy storage elements. Electrical devices can be, but are not limited to, mobile phones, tablets, laptops, electric toys, power tools, electric vehicles, electric cars, ships, spacecraft, etc. Electric toys can include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Spacecraft can include airplanes, rockets, space shuttles, and spacecraft, etc.

[0082] For ease of explanation, the following embodiments will be described using a vehicle 1000a as an example of an electrical device according to an embodiment of this application.

[0083] Please refer to Figure 1Vehicle 1000a 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 100a is internally installed in vehicle 1000a, and the battery 100a can be located at the bottom, front, or rear of vehicle 1000a. The battery 100a can be used to power vehicle 1000a; for example, the battery 100a can serve as the operating power source for vehicle 1000a. Vehicle 1000a may also include a controller 200a and a motor 300a. The controller 200a is used to control the battery 100a to supply power to the motor 300a, for example, to meet the power needs of vehicle 1000a during starting, navigation, and driving.

[0084] In some embodiments of this application, the battery 100a can not only serve as the operating power source for the vehicle 1000a, but also as the driving power source for the vehicle 1000a, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000a.

[0085] In some embodiments, battery 100a may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0086] The battery 100a mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells 1 to provide higher voltage and capacity.

[0087] In this embodiment, each battery cell 1 can be a secondary battery, which refers to a battery cell that can be recharged after discharge to activate the active materials and continue to be used. Each battery cell 1 can also be a primary battery.

[0088] Battery cell 1 includes, but is not limited to, lithium-ion batteries, sodium-ion batteries, sodium-lithium-ion batteries, lithium metal batteries, sodium metal batteries, lithium-sulfur batteries, magnesium-ion batteries, nickel-metal hydride batteries, nickel-cadmium batteries, lead-acid batteries, etc. Battery cell 1 may be cylindrical, flat, cuboid, or other shapes.

[0089] In some embodiments, the battery 100a can be a battery module. When there are multiple battery cells 1, the multiple battery cells 1 are arranged and fixed to form a battery module.

[0090] In some embodiments, please refer to Figure 2 The battery 100a can be a battery pack, which includes a housing 10a and a battery cell 1, with the battery cell 1 or battery module housed in the housing 10a.

[0091] In some embodiments, the housing 10a may be part of the chassis structure of the vehicle 1000a. For example, a portion of the housing 10a may be at least a portion of the floor of the vehicle 1000a, or a portion of the housing 10a may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000a.

[0092] Please refer to Figure 2 The battery 100a includes a housing 10a and a battery cell 1, with the battery cell 1 housed within the housing 10a. The housing 10a provides a space for the battery cell 1 and can have various structures. In some embodiments, the housing 10a may include a first portion 11a and a second portion 12a, which overlap each other, together defining a space for accommodating the battery cell 1. The second portion 12a may be a hollow structure with one open end, and the first portion 11a may be a plate-like structure, covering the open side of the second portion 12a so that the first portion 11a and the second portion 12a together define the space. Alternatively, both the first portion 11a and the second portion 12a may be hollow structures with one open side, with the open side of the first portion 11a covering the open side of the second portion 12a. Of course, the housing 10a formed by the first portion 11a and the second portion 12a can have various shapes, such as a cylinder or a cuboid.

[0093] In battery 100a, there can be multiple battery cells 1, which can be connected in series, parallel, or a combination thereof. A combination thereof means that multiple battery cells 1 are connected in both series and parallel. Multiple battery cells 1 can be directly connected in series, parallel, or a combination thereof, and then the entire assembly of the multiple battery cells 1 is housed within housing 10a. Alternatively, battery 100a can also consist of multiple battery cells 1 first connected in series, parallel, or a combination thereof to form a battery module, and then multiple battery modules connected in series, parallel, or a combination thereof to form a whole, which is also housed within housing 10a. Battery 100a may also include other structures; for example, battery 100a may also include a busbar component for realizing the electrical connection between multiple battery cells 1.

[0094] Please refer to Figure 3 and Figure 4 In this context, "battery cell 1" refers to the smallest unit that makes up the battery. In this embodiment, a cylindrical battery cell 1 is used as an example for description. Figure 3 and Figure 4 As shown, the battery cell 1 includes a housing 100, an electrode assembly 500, and other functional components.

[0095] In some embodiments, the housing 100 is used to encapsulate the electrode assembly 500 and components such as the electrolyte. The housing 100 can be a steel housing, an aluminum housing, a plastic housing (such as a polypropylene housing), a composite metal housing (such as a copper-aluminum composite housing), or an aluminum-plastic film, etc.

[0096] The housing 100 may include an end cap 120 and a housing 110. The end cap 120 is a component that closes onto the opening of the housing 110 to isolate the internal environment of the battery cell 1 from the external environment. Not limited to this, the shape of the end cap 120 may be adapted to the shape of the housing 110 to fit it. Optionally, the end cap 120 may be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 120 is less prone to deformation under pressure and impact, allowing the battery cell 1 to have higher structural strength and improved safety performance. Functional components such as electrode terminals 200 may be provided on the end cap 120. The electrode terminals 200 can be used for electrical connection with the electrode assembly 500 for outputting or inputting electrical energy from the battery cell 1. In some embodiments, the end cap 120 may also be provided with a pressure relief mechanism for releasing internal pressure when the internal pressure or temperature of the battery cell 1 reaches a threshold. The end cap 120 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic. In some embodiments, an insulating component may be provided on the inner side of the end cap 120. The insulating component can be used to isolate the electrical connection components within the housing 110 from the end cap 120 to reduce the risk of short circuits. For example, the insulating component can be plastic, rubber, etc.

[0097] The housing 110 is a component used to cooperate with the end cap 120 to form the internal environment of the battery cell 1. This internal environment can accommodate the electrode assembly 500, electrolyte, and other components. The housing 110 and the end cap 120 can be independent components. An opening 111 can be provided on the housing 110, and the end cap 120 can close the opening 111 to form the internal environment of the battery cell 1. Alternatively, the end cap 120 and the housing 110 can be integrated. Specifically, the end cap 120 and the housing 110 can form a common connecting surface before other components are inserted into the housing. When it is necessary to encapsulate the interior of the housing 110, the end cap 120 closes the housing 110. The housing 110 can have various shapes and sizes, such as cuboid, cylindrical, hexagonal prism, etc. Specifically, the shape of the housing 110 can be determined according to the specific shape and size of the electrode assembly 500. The housing 110 can be made of various materials, including but not limited to copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0098] Electrode assembly 500 is a component in the battery cell 1 where an electrochemical reaction occurs. The housing 110 may contain one or more electrode assemblies 500.

[0099] In some embodiments, the electrode assembly 500 includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, disposed between the positive and negative electrodes, serves to prevent short circuits between the positive and negative electrodes while allowing active ions to pass through.

[0100] 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.

[0101] 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.

[0102] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum or stainless steel with a silver surface treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0103] 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, at least one of 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), LiNi0.5Co0.25Mn0.25O2 (also abbreviated as NCM211), LiNi0.6Co0.2Mn0.2O2 (also abbreviated as NCM622), LiNi0.8Co0.1Mn0.1O2 (also abbreviated as NCM811), lithium nickel cobalt aluminum oxides (such as LiNi0.85Co0.15Al0.05O2) and their modified compounds.

[0104] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0105] As an example, the negative electrode current collector can be a metal foil, a foamed metal, or a composite current collector. For example, as a metal foil, it can be silver-treated aluminum or stainless steel, stainless steel, copper, aluminum, nickel, carbon electrodes, carbon, nickel, or titanium, etc. Foamed metal can be foamed nickel, foamed copper, foamed aluminum, foamed alloy, or foamed carbon, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0106] 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.

[0107] 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.

[0108] 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 battery negative electrode active materials may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0109] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0110] In some embodiments, the electrode assembly 500 further includes an isolator disposed between the positive and negative electrodes.

[0111] In some embodiments, the separator is a separator membrane. This application does not impose any particular limitation on the type of separator membrane; any known porous separator membrane with good chemical and mechanical stability can be selected.

[0112] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramic. The separator can be a single-layer film or a multi-layer composite film, without particular limitation. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular limitation. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0113] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0114] 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 can be liquid, gel, or solid.

[0115] Liquid electrolytes include electrolyte salts and solvents.

[0116] 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.

[0117] 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.

[0118] Among them, the gel electrolyte includes a polymer as the electrolyte backbone network, combined with an ionic liquid - lithium salt.

[0119] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0120] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0121] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0122] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0123] In some embodiments, the electrode assembly 500 is a wound structure. The positive electrode and the negative electrode are wound into a wound structure.

[0124] In some embodiments, the electrode assembly 500 is provided with tabs 501, which can conduct current from the electrode assembly 500. The tabs include a positive tab and a negative tab. The positive and negative tabs can be located together at one end of the main body or at opposite ends of the main body. During the charging and discharging process of the battery 100a, the positive and negative active materials react with the electrolyte, and the tabs 501 connect to the electrode terminals to form a current loop.

[0125] According to some embodiments of this application, such as Figures 3 to 5 As shown in the embodiment of battery cell 1 of this application, the battery cell 1 includes a housing 100, electrode terminals 200, and a sealing member 300. The housing 100 includes a wall portion 101 having a lead-out hole 102. The electrode terminal 200 includes an insertion portion 210 and a flange portion 220 connected to each other along the axial direction of the electrode terminal 200. The insertion portion 210 is disposed within the lead-out hole 102, and the flange portion 220 is located on the side of the insertion portion 210 away from the interior of the housing 100. In the radial direction of the electrode terminal 200, the flange portion 220 at least partially extends beyond the insertion portion 210.

[0126] The axial direction of electrode terminal 200 refers to the distance between the end of electrode terminal 200 facing the interior of housing 100 and the end facing away from the interior of housing 100, while the radial direction of electrode terminal 200 refers to the direction perpendicular to the axial direction of electrode terminal 200. Unless otherwise specified, the axial and radial directions mentioned below refer to the axial and radial directions of electrode terminal 200.

[0127] One end of the electrode terminal 200 is disposed facing the interior of the housing 100 and can be used to electrically connect to the electrode assembly 500 disposed within the housing 100. The other end of the electrode terminal 200 is disposed facing the exterior of the housing 100 and can be connected to the outside, thereby enabling the charging and discharging of the electrode assembly 500. For example, the other end of the electrode terminal 200 may have a flange portion 220, which is connected to the outside via a sealing member 300. The electrode terminal 200 can be installed in the housing 100 by means of an insertion portion 210 disposed within the lead-out hole 102.

[0128] like Figures 5 to 7 As shown, in the radial direction of the electrode terminal 200, the flange portion 220 at least partially extends beyond the insertion portion 210. This means that when the outer end face 221 of the flange portion 220 is projected onto the insertion portion 210 along the aforementioned axial direction, the outer end face 221 of the flange portion 220 is at least partially located outside the outer end face of the insertion portion 210. In other words, the radial dimension D3 of at least a portion of the outer end face 221 of the flange portion 220 is greater than the radial dimension D8 of the outer peripheral surface of the insertion portion 210. This arrangement allows the flange portion 220 and the wall portion 101 to overlap around the exit hole 102, facilitating a sealed connection between the electrode terminal 200 and the wall portion 101.

[0129] The electrode terminal 200 has an axially oriented groove 230, which includes a first groove segment 231 and a second groove segment 232. The first groove segment 231 is located at the end of the second groove segment 232 away from the interior of the outer casing 100. The first groove segment 231 is located within a flange 220, and the second groove segment 232 is at least partially located within the flange 220. The radial dimension D5 of the first groove segment 231 is greater than the radial dimension D6 of the second groove segment 232, thereby forming an annular platform 233 at the connection between the first groove segment 231 and the second groove segment 232. A sealing member 300 is used to seal the groove 230. The sealing member 300 includes a body portion 310 and a guide portion 320. The body portion 310 is disposed within the first groove segment 231 and supported on the annular platform 233. The guide portion 320 is disposed within the second groove segment 232. The sealing member 300 is fixedly connected to the electrode terminal 200.

[0130] The sealing component 300 is used to seal the groove portion 230 and can be used to alleviate electrolyte leakage inside the battery cell 1.

[0131] The annular platform 233 can be used for the body portion 310 to abut against. The annular platform 233 can be a flat surface and parallel to the surface on which the body portion 310 is supported. Since the radial dimension D5 of the first groove segment 231 is large, the mating area between the body portion 310 of the sealing member 300 and the electrode terminal 200 can be increased. At the same time, since the radial dimension D6 of the second groove segment 232 is small, it helps to reduce the problem of damage to the electrode terminal 200 caused by insufficient connection strength between the flange portion 220 and the insertion portion 210, thereby improving the connection effect between the sealing member 300 and the electrode terminal 200.

[0132] Furthermore, when the flange portion 220 is fixedly connected to the body portion 310 at the annular platform 233, the mating area when the flange portion 220 and the body portion 310 abut is increased by setting the annular platform 233, which can increase the connection area between the flange portion 220 and the body portion 310 and improve the stability of the connection between the sealing member 300 and the electrode terminal 200.

[0133] Furthermore, by providing the first groove segment 231, the axial dimension of the battery cell 1 can be reduced. Specifically, by placing the body portion 310 within the first groove segment 231, the body portion 310 and the flange portion 220 at least partially overlap in the axial direction, thereby reducing the axial dimension of the battery cell 1. Simultaneously, the body portion 310 within the first groove segment 231 acts as a limiting element, reducing the risk of the sealing member 300 slipping out of the groove portion 230 during assembly.

[0134] By placing the guide portion 320 within the second groove section 232, the guide portion 320 can block the groove portion 230 within the second groove section 232. At the same time, the guide portion 320 can also act as a limit within the second groove section 232, thereby reducing the risk of the sealing part 300 sliding out of the groove portion 230 during assembly.

[0135] Battery cell 1 is electrically connected to the outside via sealing member 300. By fixing sealing member 300 to electrode terminal 200, a current path can be formed between electrode assembly 500, electrode terminal 200, and sealing member 300. Electrode assembly 500 can be electrically connected to the outside via electrode terminal 200 and sealing member 300 in sequence. For example, battery cell 1 can be connected to busbar via sealing member 300. Busbar is a multi-layer composite structure connecting bar that can connect multiple battery cells 1 in series or parallel by welding or bolting.

[0136] Furthermore, the sealing component 300 can be electrically connected to the outside via the main body 310.

[0137] Corresponding to the fact that the radial dimension D5 of the first slot segment 231 is greater than the radial dimension D6 of the second slot segment 232, the body portion 310 extends at least partially beyond the guide portion 320 in the radial direction. The outer end face of the body portion 310 can be located on the outer surface of the battery cell 1, thereby enabling electrical connection with the outside. By providing that the body portion 310 extends at least partially beyond the guide portion 320 in the radial direction of the electrode terminal 200, the area of ​​the outer end face of the body portion 310 can be increased, which is beneficial for realizing the operation of connecting the body portion 310 to the outside.

[0138] Optionally, the sealing component 300 is an aluminum nail, and the electrode terminal 200 is a copper riveting structure.

[0139] Optionally, the electrode terminal 200 may include a limiting flange 250 located inside the housing 100 to prevent the electrode terminal 200 from detaching from the housing 100.

[0140] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, the outer end face of the main body 310, which is away from the interior of the outer shell 100, protrudes from the outer end face of the flange 220, which is away from the interior of the outer shell 100, and the main body 310 is welded and fixed to the flange 220.

[0141] In the axial direction, by setting the outer end face of the body portion 310 away from the interior of the housing 100 to protrude from the outer end face of the flange portion 220 away from the interior of the housing 100, the absorption of welding energy by the outer end face of the flange portion 220 away from the interior of the housing 100 can be reduced, so that the welding energy can be more easily and directly applied to the body portion 310, thereby improving the welding connection effect between the body portion 310 and the flange portion 220 and reducing the adverse effects of welding energy on the outer end face of the flange portion 220 away from the interior of the housing 100.

[0142] In the radial direction of the electrode terminal 200, the outer end face of the body portion 310 away from the interior of the housing 100 protrudes from the outer end face of the flange portion 220 away from the interior of the housing 100, which indicates that the body portion 310 and the flange portion 220 overlap, thus facilitating the welding connection between the body portion 310 and the flange portion 220.

[0143] During the assembly of the battery cell 1, when the sealing member 300 has been inserted into the groove 230, a welding operation can be performed axially from one side of the outer end face of the body 310. The welding process can penetrate the body 310 and extend into the flange 220, and form a molten body that penetrates the body 310 and extends into the flange 220 axially. After the molten body solidifies, the flange 220 and the body 310 can be connected.

[0144] By setting the body portion 310 to extend at least partially beyond the guide portion 320 in the radial direction, the area of ​​the outer end face of the body portion 310 can be increased, which is beneficial for realizing the operation of electrically connecting the body portion 310 and the flange portion 220.

[0145] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, the battery cell 1 includes an insulating member 600, which surrounds the periphery of the electrode terminal 200 and is located between the electrode terminal 200 and the wall portion 101. The electrode terminal 200, the sealing member 300, and the insulating member 600 are configured such that welding energy reflected by the outer peripheral surface 311 of the protruding portion of the body portion 310 relative to the flange portion 220 and transmitted to the insulating member 600 is blocked by the outer end surface 221 of the flange portion 220.

[0146] The insulating member 600 can form an insulation between the electrode terminal 200 and the wall portion 101, thereby restricting the current from flowing directly from the electrode terminal 200 into the wall portion 101 or directly from the wall portion 101 into the electrode terminal 200.

[0147] When the sealing component 300 is assembled, the energy from the welding process acts on the outer peripheral surface 311 of the protruding portion of the body portion 310 relative to the flange portion 220, thereby melting the body portion 310 and the flange portion 220. The outer peripheral surface 311 of the protruding portion of the body portion 310 relative to the flange portion 220 reflects some of the welding energy, posing a risk that the insulating component 600 may melt due to the welding energy. The welding energy source may also emit energy outward from the outer peripheral surface 311 of the protruding portion of the body portion 310 relative to the flange portion 220, posing a risk that the insulating component 600 may melt due to the welding energy. By arranging the dimensions and positional relationships of the electrode terminals 200, the sealing component 300, and the insulating component 600, the energy transmitted from the outer peripheral surface 311 of the protruding portion of the body portion 310 relative to the flange portion 220 toward the insulating component 600 can be blocked by the outer end surface 221 of the flange portion 220, thereby reducing the adverse effects of welding energy on the insulating component 600.

[0148] Optionally, when the insertion part 210 is provided in the lead-out hole 102, there is a gap between the insertion part 210 and the lead-out hole 102, and the insulating member 600 can be provided in the gap to fill the gap.

[0149] Furthermore, the insulating member 600 abuts against the wall portion 101 and the flange portion 220 at its two ends in the axial direction, respectively.

[0150] Optionally, the insulating element 600 can also serve as a seal to limit electrolyte leakage from the gap.

[0151] Optionally, the insulating element 600 may be made of insulating plastic material.

[0152] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, the outer end face 221 of the flange portion 220 protrudes from the outer end face 601 of the insulating member 600 away from the interior of the outer casing 100, and satisfies the following relationship:

[0153] arctan(H5 / ((D4-D3) / 2))>arctan((H3-H2) / ((D3-D2) / 2)),

[0154] Wherein, H5 is the protrusion height of the outer end face 221 of the flange portion 220 relative to the outer end face of the insulating member 600, D4 is the radial dimension of the outer end face of the insulating member 600, D3 is the radial dimension of the outer end face 221 of the flange portion 220, H3 is the axial thickness of the body portion 310 located in the first groove segment 231, H2 is the axial depth of the first groove segment 231, and D2 is the radial dimension of the outer end face of the body portion 310.

[0155] The value of arctan(H5 / ((D4-D3) / 2)) equals the angle α, and the value of arctan(H5 / ((D4-D3) / 2)) equals the angle β. Since the arctangent function is a direct proportional function, the value of angle α is greater than the value of angle β. By reasonably setting the dimensional parameters of the relevant components, the energy transmitted from the outer peripheral surface 311 of the protruding portion of the body part 310 relative to the flange part 220 towards the insulating member 600 can be blocked by the flange part 220, thereby reducing the adverse effects of welding energy on the insulating member 600.

[0156] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, in the axial direction, the protrusion height of the outer end face of the body portion 310 relative to the outer end face 221 of the flange portion 220 is greater than or equal to 0.1 mm.

[0157] In other words, the outer end face of the body portion 310 protrudes beyond the outer end face 221 of the flange portion 220, and the height difference between the outer end face of the body portion 310 and the outer end face 221 of the flange portion 220 is greater than or equal to 0.1 mm, i.e., H3-H2≥0.1 mm. For example, H3-H2 can be set to 0.1 mm, 0.2 mm, 0.3 mm, 0.5 mm, or 1 mm, etc.

[0158] In the axial direction, by setting the protrusion height of the outer end face of the body portion 310 relative to the outer end face 221 of the flange portion 220 to be greater than or equal to 0.1 mm, welding energy can be more easily and directly applied to the body portion 310. This arrangement can improve the welding effect between the body portion 310 and the flange portion 220, and reduce the adverse effects of welding energy on the outer end face of the flange portion 220 that is away from the interior of the outer casing 100.

[0159] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, in the axial direction, the axial thickness H3 of the body portion 310 located in the first groove segment 231 is less than or equal to 0.5 times the difference between the axial thickness H1 of the flange portion 220 and the axial depth H2 of the first groove segment 231, and the body portion 310 is welded and fixed to the flange portion 220. That is, H3≤0.5(H1-H2).

[0160] By setting H3≤0.5(H1-H2), the welding strength between the body portion 310 and the flange portion 220 can be improved.

[0161] Specifically, during the assembly of the battery cell 1, with the sealing component 300 already inserted into the groove 230, a welding operation can be performed axially from one side of the outer end face of the body portion 310. The welding process forms a molten material that penetrates the body portion 310 and extends into the flange portion 220. After the molten material solidifies, it connects the flange portion 220 and the body portion 310. The difference between the axial thickness H1 of the flange portion 220 and the axial depth H2 of the first groove segment 231 is the thickness of the flange portion 220 along the direction of molten material penetration. However, if the molten material completely penetrates the flange portion 220, it can cause poor weld penetration. Poor weld penetration of the flange portion 220 can manifest as the molten material completely penetrating the flange portion 220 and further flowing out from the flange portion 220, causing damage to other components of the battery cell 1. For example, it may damage the insulating component 600, affecting insulation and sealing performance; or, for example, the flange portion 220 may be mistakenly welded to the wall portion 101, causing a short circuit, etc.

[0162] By setting the axial thickness H3 of the body portion 310 located in the first groove segment 231 to be less than or equal to 0.5 times the thickness of the flange portion 220 that the molten material can penetrate, the molten material can more easily penetrate the body portion 310 during the welding process and stop in time when it extends further into the flange portion 220. This is beneficial for controlling the welding process, reducing the risk of the flange portion 220 being welded through, and mitigating the adverse effects caused by the flange portion 220 being welded through.

[0163] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, the axial thickness H3 of the body portion 310 located within the first groove segment 231 is greater than or equal to 0.3 mm, and the axial depth H2 of the first groove segment 231 is greater than or equal to 0.2 mm. That is, H2 ≥ 0.2 mm, H3 ≥ 0.3 mm. For example, H2 can be set to 0.3 mm, 0.4 mm, 0.5 mm, 0.8 mm, etc. For example, H3 can be set to 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, etc.

[0164] By setting the axial thickness H3 of the body portion 310 located in the first groove segment 231 to be greater than or equal to 0.3 mm, the load-bearing capacity of the body portion 310 can be improved, and the connection strength can be improved when the body portion 310 is connected to the flange portion 220.

[0165] By setting the axial depth H2 of the first groove segment 231 to be greater than or equal to 0.2 mm, on the one hand, the overlapping size of the sealing member 300 and the groove portion 230 in the axial direction can be increased, thereby improving the limiting effect of the groove portion 230 on the sealing member 300. On the other hand, the axial size of the battery cell 1 can be reduced.

[0166] According to some embodiments of this application, optionally, such as Figures 5 to 7As shown, in the radial direction, the difference between the radial dimension D2 of the outer end face of the body 310 and the radial dimension D1 of the inner ring edge of the annular platform 233 is greater than or equal to 0.3 mm. That is, D2-D1≥0.3 mm. For example, D2-D1 can be set to 0.4 mm, 0.5 mm, 0.8 mm, 1 mm, etc.

[0167] The body portion 310 is supported on the annular platform 233. In the radial direction, the body portion 310 and the flange portion 220 can contact each other from the outer end face of the body portion 310 to the inner ring edge of the annular platform 233. That is, the contact surface between the body portion 310 and the flange portion 220 is an annular shape with a width greater than or equal to 0.3 mm.

[0168] In the radial direction, by setting the difference between the radial dimension D2 of the outer end face of the body portion 310 and the radial dimension D1 of the inner ring edge of the annular platform 233 to be greater than or equal to 0.3 mm, the contact area between the body portion 310 and the flange portion 220 can be increased, thereby improving the stability of the flange portion 220 supporting the body portion 310.

[0169] Furthermore, when connecting the body portion 310 and the flange portion 220, this arrangement facilitates the connection operation, increases the connection area, improves the connection effect, and enhances the connection stability between the body portion 310 and the flange portion 220.

[0170] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, the outer end face of the body portion 310 away from the interior of the outer casing 100 includes a central region 312 and a welding area 313 surrounding the central region 312. The central region 312 is used to connect with external conductive components, and the welding area 313 is used to weld onto the flange portion 220.

[0171] The welding process can be performed from the outer end face of the body portion 310. Accordingly, the molten material generated by welding can form from the side of the body portion 310 away from the outer end face 221 of the flange portion 220, and penetrate the body portion 310 to extend further into the flange portion 220. After the molten material generated by welding cools and solidifies, it can form a weld mark 801, thereby connecting the flange portion 220 and the body portion 310.

[0172] The welding area 313 is arranged around the central area 312. Accordingly, the welding trajectory when the body part 310 and the flange part 220 are welded together can surround the central area 312, thereby forming a weld mark 801 located in the welding area 313 and surrounding the central area 312, so that the body part 310 and the flange part 220 are evenly connected and the connection stability is improved.

[0173] According to some embodiments of this application, optionally, such as Figures 5 to 7As shown, the welding area 313 is recessed towards the interior of the outer casing 100 relative to the central area 312.

[0174] After the solder mark 801 is formed, it may protrude from the surface of the material before welding. Specifically, the solder mark 801 may protrude from the surface of the welding area 313 before welding. By setting the welding area 313 to be recessed inward relative to the center area 312 toward the housing 100, the risk of the solder mark 801 protruding from the center area 312 and thus affecting the connection between the center area 312 and external conductive components can be reduced.

[0175] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, in the axial direction, the recess depth H4 of the welded area 313 relative to the central area 312 is greater than or equal to 0.1 mm. For example, H4 can be set to 0.15 mm, 0.2 mm, 0.3 mm, 0.5 mm, 0.8 mm, 1 mm, etc.

[0176] By setting the recess depth H4 of the solder area 313 relative to the center area 312 to be greater than or equal to 0.1 mm, the risk of the solder mark 801 protruding from the center area 312 and affecting the connection between the center area 312 and external conductive components can be reduced.

[0177] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5 As shown, in the radial direction, the radial dimension D7 of the inner ring edge of the welding area 313 is less than or equal to the radial dimension D1 of the inner ring edge of the annular platform 233.

[0178] By setting the radial dimension D7 of the inner ring edge of the welding area 313 to be less than or equal to the radial dimension D1 of the inner ring edge of the annular platform 233, the area of ​​the welding area 313 can be expanded, which facilitates welding operations and thus helps to improve welding strength.

[0179] On the other hand, radially, the body portion 310 and the flange portion 220 can contact each other from the outer end face of the body portion 310 to the inner ring edge of the annular platform 233. When the welding area 313 is projected axially onto the annular platform 233, the projection of the welding area 313 can cover the contact surface between the body portion 310 and the flange portion 220. In some embodiments, after the molten material penetrates the body portion 310 axially, a portion of the molten material extends from the outer side of the inner ring edge of the annular platform 233 into the flange portion 220, forming a welded connection axially between the flange portion 220 and the body portion 310. Another portion of the molten material extends from the inner side of the inner ring edge of the annular platform 233 into the guide portion 320, forming a welded connection radially between the flange portion 220 and the guide portion 320 with the aforementioned molten material extending into the flange portion 220. In this way, the welding effect between the sealing member 300 and the electrode terminal 200 can be improved.

[0180] According to some embodiments of this application, optionally, such as Figures 5 to 7 As shown, in the radial direction, the radial dimension D5 of the first groove segment 231 is less than or equal to the radial dimension D8 of the outer peripheral surface of the insertion part 210.

[0181] During the molding process of the first groove segment 231 and the annular platform 233, the flange portion 220 can be subjected to axial forces from external molding equipment at the annular platform 233. By setting the radial dimension D5 of the first groove segment 231 to be less than or equal to the radial dimension D8 of the outer peripheral surface of the insertion portion 210, when the annular platform 233 is projected axially onto the insertion portion 210, the projection of the annular platform 233 can fall within the insertion portion 210. Correspondingly, the force exerted on the flange portion 220 at the annular platform 233 can be transmitted axially to the insertion portion 210. In this way, the risk of damage to the flange portion 220 due to axial forces can be reduced.

[0182] Alternatively, the insulating member 600 may be disposed on the outer periphery of the insertion portion 210 and on the side of the flange portion 220 near the interior of the housing 100. This arrangement reduces the risk of damage to the insulating member 600.

[0183] Optionally, the first groove segment 231 and the annular platform 233 can be formed by stamping or cutting.

[0184] According to some embodiments of this application, optionally, such as Figure 8 As shown, the flange portion 220 and the insertion portion 210 are integrally formed and are bent relative to the insertion portion 210. The first groove segment 231 is formed by stamping.

[0185] like Figure 6 and Figure 8 As shown, during the forming process of the electrode terminal 200, the flange portion 220 bends relative to the insertion portion 210 to form a transition fillet 900. When the flange portion 220 supports the body portion 310, the presence of the transition fillet 900 results in an excessively small contact area between the flange portion 220 and the body portion 310, making it difficult for the flange portion 220 to provide effective support to the body portion 310.

[0186] The transition radius 900 between the flange portion 220 and the insertion portion 210 can be reduced by stamping, which can increase the contact area between the flange portion 220 and the body portion 310, and facilitate the flange portion 220 to support the body portion 310.

[0187] Compared to cutting and forming, stamping has higher production efficiency, better stability of the formed surface quality, less waste, and is more suitable for large-scale production.

[0188] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5 As shown, the flange portion 220 and the insertion portion 210 are integrally formed. The electrode terminal 200 includes a sealing portion 240 integrally formed with the insertion portion 210. The sealing portion 240 seals the end of the insertion portion 210 facing the inside of the housing 100 to form a groove portion 230.

[0189] The side of the sealing portion 240 facing away from the interior of the housing 100 can form the bottom wall of the recess 230. By providing the sealing portion 240, the manufacturing process of the electrode terminal 200 can be simplified.

[0190] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5 As shown, the groove 230 is used to inject electrolyte into the interior of the housing 100.

[0191] During the production process of battery cell 1, the groove 230 can connect to the interior of the outer casing 100, thereby allowing electrolyte to be injected into the interior of the outer casing 100 through the groove 230. By providing the groove 230, electrolyte can be injected through the groove 230 after the electrode terminals 200 are assembled and connected to the outer casing 100, and then sealed using the sealing member 300. This simplifies the structural complexity of battery cell 1 and improves the assembly efficiency of battery cell 1.

[0192] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5 As shown, the sealing part 240 is provided with a liquid injection hole 241, which connects the interior of the outer shell 100 with the groove part 230.

[0193] Furthermore, the two ends of the injection hole 241 along the axial direction can respectively connect to the groove portion 230 and the interior of the outer casing 100.

[0194] During electrolyte injection, the electrolyte flows sequentially through the groove 230 and the injection hole 241 before entering the housing 100. The injection hole 241 facilitates sealing after electrolyte injection. The sealing portion 240 is thinner than the insertion portion 210; placing the injection hole 241 within the sealing portion 240 facilitates its formation and allows for easier electrolyte injection.

[0195] Optionally, the battery cell 1 may include a sealing plug. The sealing plug can be used to seal the injection hole 241 after the electrolyte injection is completed. Further, the sealing plug is made of an elastic polymer material, such as silicone, rubber, etc.

[0196] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5As shown, the battery cell 1 also includes a current collector 400 and an electrode assembly 500 disposed inside the housing 100. The current collector 400 is used to connect the tabs 501 and the electrode terminals 200 of the electrode assembly 500. The sealing portion 240 is welded to the current collector 400 on the side opposite to the groove portion 230.

[0197] The current collector 400 can be disposed between the electrode terminal 200 and the electrode assembly 500, and serves to form a current path between the electrode terminal 200 and the electrode assembly 500. By providing the current collector 400, electrical connection between the electrode terminal 200 and the electrode assembly 500 is easily achieved. Taking advantage of the thinness of the sealing part 240, it is welded to the current collector 400, facilitating electrical connection between the electrode terminal 200 and the current collector 400 from the side of the electrode terminal 200 away from the current collector 400.

[0198] According to some embodiments of this application, optionally, such as Figure 4 and Figure 5 As shown, the battery cell 1 also includes an electrode assembly 500. The housing 100 includes a housing 110 and an end cap 120. One end of the housing 110 has an opening 111, and the end cap 120 covers the opening 111. The housing 110 includes a side wall 112 and an end wall 113. The side wall 112 surrounds the outside of the electrode assembly 500, and the end wall 113 is disposed opposite to the opening 111. The wall portion 101 is either the end cap 120 or the end wall 113.

[0199] In the above embodiment, the wall portion 101 is an end wall 113. In other embodiments, the wall portion 101 may also be an end cap 120.

[0200] Since the end cap 120 or end wall 113 is flatter than the side wall 112, the assembly efficiency of the battery cell 1 can be improved by setting the electrode terminal 200 and the sealing member 300 on the end cap 120 or end wall 113.

[0201] According to some embodiments of this application, optionally, such as Figure 6 As shown, the guide section 320 and the second groove section 232 are respectively arranged in a frustum shape with the cross-section gradually decreasing in the direction toward the interior of the outer casing 100.

[0202] By setting the guide portion 320 and the second groove segment 232 to frustoconical shapes with cross-sections gradually decreasing in the direction toward the interior of the outer casing 100, the guide portion 320 can be guided into the second groove segment 232 during the assembly process of the battery cell 1, which facilitates the insertion of the sealing member 300 into the groove portion 230 and helps to improve the assembly efficiency of the battery cell 1.

[0203] According to some embodiments of this application, optionally, such as Figure 6 and Figure 7As shown, in the axial direction, the axial depth H2 of the first groove segment 231 is less than the axial depth H6 of the second groove segment 232.

[0204] The first groove segment 231 and the second groove segment 232 respectively limit the main body 310 and the guide portion 320. The sum of the axial depth H2 of the first groove segment 231 and the axial depth H6 of the second groove segment 232 can be considered as the limiting length of the groove portion 230 on the sealing member 300. When the thickness of the flange portion 220 is constant, since the radial dimension D5 of the first groove segment 231 is greater than the radial dimension D6 of the second groove segment 232, the deeper the axial depth H2 of the first groove segment 231, the smaller the distance H1-H2 between the annular platform 233 and the surface of the flange portion 220 near the interior of the outer shell 100.

[0205] By setting the axial depth H2 of the first groove segment 231 to be less than the axial depth H6 of the second groove segment 232, the distance H1-H2 between the annular platform 233 and the surface of the flange portion 220 near the interior of the outer casing 100 can be reduced, thereby improving the load-bearing capacity of the connection between the flange portion 220 and the insertion portion 210.

[0206] According to some embodiments of this application, optionally, such as Figures 3 to 8As shown, the battery cell 1 includes a housing 100, electrode terminals 200, and a sealing member 300. The housing 100 includes a wall portion 101, which has an outlet hole 102. The electrode terminal 200 includes an insertion portion 210 and a flange portion 220 connected to each other along the axial direction of the electrode terminal 200. The insertion portion 210 is disposed in the lead-out hole 102. The flange portion 220 is located on the side of the insertion portion 210 away from the interior of the housing 100. In the radial direction of the electrode terminal 200, the flange portion 220 at least partially extends beyond the insertion portion 210. The electrode terminal 200 has a groove portion 230 disposed along the axial direction. The groove portion 230 includes a first groove segment 231 and a second groove segment 232. The first groove segment 231 is located at the end of the second groove segment 232 away from the interior of the housing 100. The first groove segment 231 is located inside the flange portion 220. The second groove segment 232 is at least partially located inside the flange portion 220. The radial dimension D5 of the first groove segment 231 is greater than the radial dimension D6 of the second groove segment 232. Thus, an annular platform 233 is formed at the connection between the first groove segment 231 and the second groove segment 232. The sealing member 300 is used to seal the groove portion 230. The sealing member 300 includes a body portion 310 and a guide portion 320. The body portion 310 is disposed in the first groove section 231 and supported on the annular platform 233. The guide portion 320 is disposed in the second groove section 232. The sealing member 300 is fixedly connected to the electrode terminal 200, and the battery cell 1 is electrically connected to the outside through the sealing member 300. The outer end face of the body portion 310 facing away from the interior of the outer casing 100 protrudes from the outer end face of the flange portion 220 facing away from the interior of the outer casing 100. The body portion 310 is welded and fixed to the flange portion 220. The battery cell 1 includes an insulating member 600, which surrounds the periphery of the electrode terminal 200 and is located between the electrode terminal 200 and the wall portion 101. The electrode terminal 200, the sealing member 300, and the insulating member 600 are configured such that welding energy reflected by the outer peripheral surface 311 of the body portion 310 relative to the protruding portion of the flange portion 220 and transmitted to the insulating member 600 is blocked by the outer end surface 221 of the flange portion 220. The outer end face 221 of the flange portion 220 protrudes from the outer end face 601 of the insulating member 600 away from the interior of the outer shell 100, and satisfies the following relationship: arctan(H5 / ((D4-D3) / 2))>arctan((H3-H2) / ((D3-D2) / 2)), where H5 is the protrusion height of the outer end face 221 of the flange portion 220 relative to the outer end face of the insulating member 600, D4 is the radial dimension of the outer end face of the insulating member 600, D3 is the radial dimension of the outer end face 221 of the flange portion 220, H3 is the axial thickness of the body portion 310 located in the first groove segment 231, H2 is the axial depth of the first groove segment 231, and D2 is the radial dimension of the outer end face of the body portion 310. In the axial direction, the protrusion height of the outer end face of the body portion 310 relative to the outer end face 221 of the flange portion 220 is greater than or equal to 0.1 mm.In the axial direction, the axial thickness H3 of the body portion 310 located within the first groove segment 231 is less than or equal to 0.5 times the difference between the axial thickness H1 of the flange portion 220 and the axial depth H2 of the first groove segment 231. The body portion 310 is welded and fixed to the flange portion 220. The axial thickness H3 of the body portion 310 located within the first groove segment 231 is greater than or equal to 0.3 mm, and the axial depth H2 of the first groove segment 231 is greater than or equal to 0.2 mm. In the radial direction, the difference between the radial dimension D2 of the outer end face of the body portion 310 and the radial dimension D1 of the inner ring edge of the annular platform 233 is greater than or equal to 0.3 mm. The outer end face of the body portion 310 facing away from the interior of the outer casing 100 includes a central region 312 and a welding area 313 surrounding the central region 312. The central region 312 is used for connection with external conductive components, and the welding area 313 is used for welding to the flange portion 220. The welding area 313 is recessed towards the interior of the outer casing 100 relative to the central area 312. Axially, the recess depth H4 of the welding area 313 relative to the central area 312 is greater than or equal to 0.1 mm. Radially, the radial dimension D7 of the inner ring edge of the welding area 313 is less than or equal to the radial dimension D1 of the inner ring edge of the annular platform 233. Radially, the radial dimension D5 of the first groove segment 231 is less than or equal to the radial dimension D8 of the outer peripheral surface of the insertion portion 210. The flange portion 220 is integrally formed with the insertion portion 210 and is bent relative to the insertion portion 210. The first groove segment 231 is formed by stamping. The flange portion 220 is integrally formed with the insertion portion 210. The electrode terminal 200 includes a sealing portion 240 integrally formed with the insertion portion 210, which seals the end of the insertion portion 210 facing the interior of the outer casing 100 to form a groove portion 230. The recess 230 is used to inject electrolyte into the interior of the housing 100. The sealing portion 240 is provided with an injection hole 241, which connects the interior of the housing 100 with the recess 230. The battery cell 1 also includes a current collector 400 and an electrode assembly 500 disposed inside the housing 100. The current collector 400 is used to connect the tabs 501 and electrode terminals 200 of the electrode assembly 500. The side of the sealing portion 240 opposite to the recess 230 is welded to the current collector 400. The battery cell 1 also includes the electrode assembly 500. The housing 100 includes a shell 110 and an end cap 120. One end of the shell 110 has an opening 111, and the end cap 120 covers the opening 111. The shell 110 includes a side wall 112 and an end wall 113. The side wall 112 surrounds the outside of the electrode assembly 500, and the end wall 113 is disposed opposite to the opening 111. The wall portion 101 is either the end cap 120 or the end wall 113. The guide section 320 and the second groove section 232 are both frustoconical in shape with their cross-sections gradually decreasing in the direction toward the interior of the outer casing 100. In the axial direction, the axial depth H2 of the first groove section 231 is less than the axial depth H6 of the second groove section 232.

[0207] The housing assembly 100b may include a housing 100 and electrode terminals 200. According to some embodiments of this application, such as... Figure 8 and Figure 9 As shown in the embodiment of the manufacturing method for housing assembly 100b of this application, the manufacturing method includes:

[0208] S100: A housing 100 is provided, the housing 100 including a wall portion 101 having an outlet hole 102.

[0209] S200: Insert the electrode terminal 200 into the lead-out hole 102, wherein the end of the electrode terminal 200 facing away from the inside of the housing 100 is cylindrical.

[0210] Optionally, the end of the electrode terminal 200 facing away from the interior of the housing 100 is provided with the aforementioned limiting flange 250 and sealing portion 240. The end of the electrode terminal 200 facing away from the interior of the housing 100 can be inserted into the lead-out hole 102 from the interior of the housing 100 and protrude from the lead-out hole 102.

[0211] S300: The end of the electrode terminal 200 located on the wall portion 101 away from the interior of the housing 100 is stamped to form an insertion portion 210 located in the lead-out hole 102 and a flange portion 220 bent and connected to the insertion portion 210. The flange portion 220 has an initial groove section 260 provided along the axial direction of the electrode terminal 200.

[0212] The insertion portion 210 and the flange portion 220 are bent together by stamping. The end of the initial groove section 260 that faces away from the interior of the outer casing 100 may have the aforementioned transition fillet 900.

[0213] S400: The end of the insertion part 210 away from the inside of the outer shell 100 is stamped a second time so that a part of the initial groove segment 260 away from the inside of the outer shell 100 is expanded into a first groove segment 231, and the remaining part of the initial groove segment 260 forms a second groove segment 232. The radial dimension D5 of the first groove segment 231 is greater than the radial dimension D6 of the second groove segment 232, thereby forming an annular platform 233 at the connection between the first groove segment 231 and the second groove segment 232.

[0214] The secondary stamping can flatten at least a portion of the aforementioned transition fillet 900 to form at least a portion of the annular platform 233.

[0215] Furthermore, the housing assembly 100b may also include a sealing member 300. The sealing member 300 can be used to seal the first groove segment 231 and the second groove segment 232, wherein the sealing member 300 includes a body portion 310 and a guide portion 320, the body portion 310 is disposed in the first groove segment 231 and supported on the annular platform 233, and the guide portion 320 is disposed in the second groove segment 232.

[0216] For any content not mentioned in the embodiments of the manufacturing method of the housing assembly in this application, please refer to the relevant descriptions of the above-mentioned battery cell embodiments, which will not be repeated here.

[0217] According to some embodiments of this application, such as Figure 2 As shown, battery 100a includes the aforementioned battery cell 1. This configuration improves the stability and reliability of battery cell 1 during operation by enhancing the connection between the electrode terminals and the sealing components, thereby improving the stability and reliability of battery 100a during operation.

[0218] According to some embodiments of this application, such as Figure 1 As shown, the electrical device includes the aforementioned battery 100a. This configuration improves the stability and reliability of the battery 100a during operation by enhancing the stability and reliability of the individual battery cells 1, thereby improving the stability and reliability of the electrical device itself.

[0219] In summary, the embodiments of this application can increase the mating area between the body portion 310 of the sealing member 300 and the electrode terminal 200 by providing an annular platform 233 for the body portion 310 to abut against, while maintaining sufficient connection strength between the flange portion 220 and the insertion portion 210, thereby improving the connection effect between the sealing member 300 and the electrode terminal 200. By providing the first groove segment 231, the axial dimension of the battery cell 1 can be reduced, and the body portion 310 can act as a limit within the first groove segment 231 to reduce the risk of the sealing member 300 slipping out of the groove portion 230 during assembly.

[0220] 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, The battery cell includes: An outer casing, the outer casing including a wall portion having an outlet hole; An electrode terminal includes an insertion portion and a flange portion connected to each other along the axial direction of the electrode terminal. The insertion portion is disposed within the lead-out hole. The flange portion is located on the side of the insertion portion away from the interior of the housing. In the radial direction of the electrode terminal, the flange portion at least partially extends beyond the insertion portion. The electrode terminal has a groove portion disposed along the axial direction. The groove portion includes a first groove segment and a second groove segment. The first groove segment is located at the end of the second groove segment away from the interior of the housing. The first groove segment is located within the flange portion. The second groove segment is at least partially located within the flange portion. The radial dimension of the first groove segment is larger than the radial dimension of the second groove segment, thereby forming an annular platform at the connection between the first groove segment and the second groove segment. A sealing component is used to seal the groove portion. The sealing component includes a body portion and a guide portion. The body portion is disposed within the first groove section and supported on the annular platform. The outer end face of the body portion facing away from the interior of the outer casing protrudes from the outer end face of the flange portion facing away from the interior of the outer casing. The body portion is welded and fixed to the flange portion. The guide portion is disposed within the second groove section. The sealing component is fixedly connected to the electrode terminal. The battery cell is electrically connected to the outside through the sealing component.

2. The battery cell according to claim 1, characterized in that, The battery cell includes an insulating member surrounding the periphery of the electrode terminal and located between the electrode terminal and the wall portion, wherein the electrode terminal, the sealing member, and the insulating member are configured such that welding energy reflected from the outer peripheral surface of the body portion relative to the protruding portion of the flange portion and transmitted to the insulating member is blocked by the outer end surface of the flange portion.

3. The battery cell according to claim 2, characterized in that, The outer end face of the flange protrudes beyond the outer end face of the insulating member that faces away from the interior of the housing, and satisfies the following relationship: arctan(H5 / ((D4-D3) / 2))>arctan( (H3-H2) / ((D3-D2) / 2) ), Wherein, H5 is the protrusion height of the outer end face of the flange relative to the outer end face of the insulator, D4 is the radial dimension of the outer end face of the insulator, D3 is the radial dimension of the outer end face of the flange, H3 is the axial thickness of the body portion located in the first groove segment, H2 is the axial depth of the first groove segment, and D2 is the radial dimension of the outer end face of the body portion.

4. The battery cell according to claim 1, characterized in that, In the axial direction, the protrusion height of the outer end face of the body portion relative to the outer end face of the flange portion is greater than or equal to 0.1 mm.

5. The battery cell according to claim 1, characterized in that, In the axial direction, the axial thickness of the body portion located within the first groove is less than or equal to 0.5 times the difference between the axial thickness of the flange portion and the axial depth of the first groove, and the body portion is welded and fixed to the flange portion.

6. The battery cell according to claim 1, characterized in that, The axial thickness of the body portion located within the first groove is greater than or equal to 0.3 mm, and the axial depth of the first groove is greater than or equal to 0.2 mm.

7. The battery cell according to claim 1, characterized in that, In the radial direction, the difference between the radial dimension of the outer end face of the body and the radial dimension of the inner ring edge of the annular platform is greater than or equal to 0.3 mm.

8. The battery cell according to claim 1, characterized in that, The outer end face of the body portion away from the interior of the outer shell includes a central region and a welding area surrounding the central region. The central region is used to connect with an external conductive component, and the welding area is used to weld onto the flange portion.

9. The battery cell according to claim 8, characterized in that, The welded area is recessed towards the interior of the outer casing relative to the central area.

10. The battery cell according to claim 9, characterized in that, In the axial direction, the depth of the recess in the welded area relative to the central area is greater than or equal to 0.1 mm.

11. The battery cell according to claim 9 or 10, characterized in that, In the radial direction, the radial dimension of the inner ring edge of the welding area is less than or equal to the radial dimension of the inner ring edge of the annular platform.

12. The battery cell according to claim 1, characterized in that, In the radial direction, the radial dimension of the first groove segment is less than or equal to the radial dimension of the outer peripheral surface of the insertion part.

13. The battery cell according to claim 1, characterized in that, The flange portion is integrally formed with the insertion portion and is bent relative to the insertion portion. The first groove segment is formed by stamping.

14. The battery cell according to claim 1, characterized in that, The flange portion is integrally formed with the insertion portion, and the electrode terminal includes a sealing portion integrally formed with the insertion portion. The sealing portion seals the end of the insertion portion facing the inside of the housing to form the groove portion.

15. The battery cell according to claim 14, characterized in that, The groove is used to inject electrolyte into the interior of the casing.

16. The battery cell according to claim 15, characterized in that, The sealing part is provided with a liquid injection hole, which connects the interior of the outer shell with the groove.

17. The battery cell according to claim 15 or 16, characterized in that, The battery cell also includes a current collector and an electrode assembly disposed inside the housing. The current collector is used to connect the tabs of the electrode assembly and the electrode terminals. The side of the sealing portion opposite to the groove portion is welded to the current collector.

18. The battery cell according to claim 1, characterized in that, The battery cell further includes an electrode assembly. The housing includes a shell and an end cap. One end of the shell has an opening, and the end cap covers the opening. The shell includes a side wall and an end wall. The side wall surrounds the outside of the electrode assembly, and the end wall is disposed opposite to the opening. The wall portion is either the end cap or the end wall.

19. The battery cell according to claim 1, characterized in that, The guide section and the second groove section are both frustoconical in shape with their cross-sections gradually decreasing in the direction toward the interior of the outer casing.

20. The battery cell according to claim 1, characterized in that, In the axial direction, the axial depth of the first groove segment is less than the axial depth of the second groove segment.

21. A battery, characterized in that, Includes the battery cell as described in any one of claims 1-20.

22. An electrical appliance, characterized in that, The electrical device includes the battery as described in claim 21.

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