Battery cell, battery device, and electric device

Abstract

The application discloses a battery monomer, a battery device and an electric equipment. The battery monomer comprises a shell, a first wall, an electrode assembly and a terminal assembly. The first wall has a first hole penetrating through in the thickness direction of the first wall. The electrode assembly is at least partially arranged in the shell. The terminal assembly comprises an electrode terminal, a first insulating piece and a second insulating piece. The terminal assembly is arranged on the first wall. The electrode terminal is arranged in the first hole and electrically connected with the electrode assembly. The first insulating piece and the second insulating piece are arranged on opposite sides of the first wall in the thickness direction. The second insulating piece is arranged around the electrode terminal. The second insulating piece is arranged on the side of the first wall close to the electrode assembly and extends to the space between the electrode terminal and the hole wall of the first hole. The battery device provided by the application can improve the insulation reliability.

Description

Technical Field

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

[0002] With the development of new energy technologies, batteries are being used more and more widely, for example in mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools.

[0003] The development of battery technology must take into account multiple design factors. For example, how to further improve the reliability of individual battery cells is an important research direction in the battery field. Utility Model Content

[0004] This application provides a battery cell, a battery device, and an electrical appliance that can improve insulation reliability.

[0005] In a first aspect, this application provides a battery device, including a housing, an electrode assembly, and a terminal assembly. The housing has a first wall with a first hole extending through it along its thickness direction. The electrode assembly is at least partially disposed in the housing. The terminal assembly includes an electrode terminal, a first insulating member, and a second insulating member. The terminal assembly is disposed on the first wall, the electrode terminal passes through the first hole and is electrically connected to the electrode assembly, and the first insulating member and the second insulating member are respectively disposed on opposite sides of the first wall in the thickness direction. The second insulating member surrounds the electrode terminal. The second insulating member is located on the side of the first wall near the electrode assembly and extends between the electrode terminal and the hole wall of the first hole. The second insulating member includes an insulator and a sealing member. The insulator surrounds the sealing member, and the sealing member is at least partially sandwiched between the hole wall of the first hole and the electrode terminal. The insulator and the sealing member abut against each other, and the orthographic projection of the sealing member and the orthographic projection of the insulator partially overlap along the thickness direction.

[0006] In the technical solution of this application embodiment, the battery cell includes a housing for providing support and housing functions, an electrode assembly disposed within the housing, and a terminal assembly disposed on the housing for electrical connection with the electrode assembly. The electrode terminals in the terminal assembly pass through the first wall of the housing and are insulated from the first wall by a first insulating member and a second insulating member. The second insulating member disposed near the electrode assembly is partially disposed on one side of the first wall in the thickness direction, and the end of the second insulating member extends to the space between the first hole wall where the terminal is located and the electrode terminal, that is, extends to the side of the electrode terminal. Therefore, it can effectively reduce the possibility of electrolyte entering the gap of the second insulating member and causing a short circuit between the electrode terminal and the first wall.

[0007] According to some embodiments of this application, the insulator and the sealing component abut against each other to form an abutment surface. The abutment surface encloses a second hole, which includes a first sub-hole and a second sub-hole arranged axially along the electrode terminal. The diameter of the first sub-hole is larger than the diameter of the second sub-hole. The second insulator may consist of two parts to facilitate installation and processing, and at least one stepped surface is formed at the abutment of the two parts to extend the electrolyte permeation path.

[0008] According to some embodiments of this application, the first sub-hole and the second sub-hole are arranged in a direction from the second insulating member to the first insulating member. This allows the sealing sub-member and the first wall to press the insulating sub-member tightly together from both sides, further improving the sealing performance.

[0009] According to some embodiments of this application, the second orifice further includes a third sub-orifice, which is located on the side of the second sub-orifice away from the first sub-orifice, and the diameter of the third sub-orifice is smaller than the diameter of the second sub-orifice. By setting more steps, the electrolyte permeation path can be further extended.

[0010] According to some embodiments of this application, the sealing component includes a first sub-part and a second sub-part arranged axially. The first sub-part abuts against the wall of a first sub-hole, and the second sub-part abuts against the wall of a second sub-hole. In the free state, the difference between the diameter of the first sub-hole and the diameter of the second sub-hole is D1, and the difference between the diameter of the first sub-part and the diameter of the second sub-part is D2. D1 and D2 satisfy: 1.2 ≤ D2 / D1 ≤ 1.5. This allows the sealing component to withstand greater compression when installed and abutting against the insulator component, and ensures that a constant contact pressure is maintained between the two under temperature variation conditions.

[0011] According to some embodiments of this application, the insulator has a first surface and a second surface that are connected in contact, and the sealing component has a third surface and a fourth surface that are connected in contact. The first surface and the third surface abut against each other to form an abutment surface; the roughness of the first surface is less than the roughness of the second surface, and the roughness of the third surface is less than the roughness of the fourth surface. This makes the two abutting surfaces smooth, thereby improving the interfacial bonding performance.

[0012] According to some embodiments of this application, the electrode terminal includes a first segment and a second segment. The second segment is connected to the end of the first segment near the electrode assembly in the axial direction of the electrode terminal. The first segment passes through a first hole, and the orthographic projection of the first wall intersects the orthographic projection of the second segment along the thickness direction. The terminal assembly also includes a sealing member surrounding the first segment, which is sandwiched between the second segment and a second insulating member along the thickness direction. The second insulating member can be integrally formed and extend to the side of the electrode terminal, and a sealing ring can be added below the second insulating member to further improve the sealing performance.

[0013] According to some embodiments of this application, the terminal assembly includes multiple seals, one of which surrounds another. Multiple layers of sequentially nested sealing rings further improve sealing performance.

[0014] According to some embodiments of this application, multiple seals include a first seal and a second seal. The diameter of the first seal is larger than the diameter of the second seal, and the first seal surrounds the second seal. In the compressed state within the battery cell, along the thickness direction, the dimensions of the first seal are H1 and the second seal are H2. In the free state, along the thickness direction, the dimensions of the first seal are H3 and the second seal are H4, where H1 / H3 < H2 / H4. This allows the outer seal to withstand greater interfacial pressure, while the inner sealing ring serves as a safety redundancy.

[0015] According to some embodiments of this application, the first seal comprises fluororubber, and the second seal comprises silicone rubber. The seal on the outer side, which makes it easier for the electrolyte to contact, is made of a more corrosion-resistant material, while the seal on the inner side, closer to the electrode terminals, is made of a more heat-resistant material.

[0016] According to some embodiments of this application, the second insulating member includes a main body and an extension. The main body is disposed on the side of the first wall facing the electrode assembly, and the extension is radially sandwiched between the hole wall of the first hole and the electrode terminal. In the thickness direction, the surface of the extension away from the electrode assembly is flush with the surface of the first wall away from the electrode assembly. Extending the second insulating member a certain dimension along the thickness direction of the first wall further reduces the possibility of short circuit between the electrode terminal and the first wall.

[0017] According to some embodiments of this application, along the thickness direction, the first insulating member is at least partially sandwiched between the electrode terminal and the first wall. The first insulating member and the second insulating member ensure that all points on the outer surface of the electrode terminal are spaced apart from and insulated from the first wall.

[0018] Secondly, according to the embodiments of this application, a battery device is provided, including: a housing and a battery cell as described in any embodiment of the first aspect, wherein the housing is enclosed to form a receiving portion; and a plurality of battery cells are disposed in the receiving cavity.

[0019] Thirdly, according to the embodiments of this application, an electrical device is provided, including the battery device in any embodiment of the second aspect, the battery device being used to provide electrical energy. Attached Figure Description

[0020] 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: Figure 1 A simplified schematic diagram of a vehicle provided for some embodiments of this application; Figure 2 This is a partial explosion diagram of a battery device provided in some embodiments of this application; Figure 3 This is an exploded schematic diagram of a battery cell provided in some embodiments of this application; Figure 4 A partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application; Figure 5 This is a partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application.

[0021] Figure label: 1000 - Vehicles; 100 - Individual battery cell; 200 - Battery assembly; 300 - Controller; 400 - Motor; 10 - Housing; 20 - Electrode assembly; 30 - Terminal assembly; 40 - Enclosure; 11-First wall; 12-First hole; 31-Electrode terminal; 32-First insulating component; 33-Second insulating component; 34-Sealing component; 41-First housing section; 42-Second housing section; 43-Receiving section; 311 - First section; 312 - Second section; 313 - Third section; 331 - Insulator component; 332 - Sealing component; 333 - Second hole; 334 - Main body; 335 - Extension; 341 - First seal; 342 - Second seal; X - Thickness direction. Detailed Implementation

[0022] 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.

[0023] 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.

[0024] 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.

[0025] 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.

[0026] 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.

[0027] 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).

[0028] 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.

[0029] 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.

[0030] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0031] The battery cell can be a lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc., and the embodiments of this application are not limited to this.

[0032] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0033] 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.

[0034] 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.

[0035] As an example, the positive current collector can be a metal foil or a composite current collector.

[0036] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0037] As an example, the negative electrode current collector can be made of metal foil, foam metal, or composite current collector.

[0038] 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.

[0039] 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.

[0040] 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.

[0041] In some embodiments, the positive current collector can be made of aluminum, and the negative current collector can be made of copper.

[0042] In some embodiments, the electrode assembly further includes an isolator disposed between the positive and negative electrodes.

[0043] 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.

[0044] As an example, the main material of the separator can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene and polyvinylidene fluoride, and ceramic.

[0045] 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.

[0046] 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.

[0047] In some embodiments, the electrode assembly is provided with tabs that allow current to be drawn from the electrode assembly. The tabs include a positive tab and a negative tab.

[0048] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0049] In some embodiments, the housing may be provided with functional components such as electrode terminals. The electrode terminals can be used to electrically connect to the electrode assembly for outputting or inputting electrical energy into the battery cell.

[0050] As an example, the battery cell can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0051] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity.

[0052] In some embodiments, the battery device can be a battery module, and when there are multiple battery cells, the multiple battery cells are arranged and fixed to form a battery module.

[0053] In some embodiments, the battery device may be a battery pack, which includes a housing and individual battery cells, with the individual battery cells or battery modules housed within the housing.

[0054] In some embodiments, the housing may be part of the vehicle's chassis structure. For example, a portion of the housing may be at least a part of the vehicle's floor, or a portion of the housing may be at least a part of the vehicle's crossbeams and longitudinal beams.

[0055] In some embodiments, the battery device may be an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0056] With the rapid development of new energy vehicles and the energy storage industry, the energy density of battery devices is constantly increasing, and users and the market are also placing higher demands on the safety performance of battery devices. As the core unit of a battery device, the safety and reliability of the battery cell directly affect the performance of the entire battery system. In existing battery cell structures, a battery cell typically includes a casing, electrode assemblies housed within the casing, and terminal assemblies electrically connected to the electrode assemblies. The terminal assemblies are mounted on the wall of the casing and are used to establish electrical conductivity between the internal electrode assemblies and the external circuitry through the electrode terminals. Simultaneously, insulating components are typically required within the battery cell to ensure electrical insulation between the electrode terminals and the casing.

[0057] In practical applications, the terminal assembly in a battery cell typically includes an upper insulating component and a lower insulating component respectively disposed on both sides of the outer casing wall, as well as a sealing ring surrounding the electrode terminals. These three components work together to achieve connection, fixation, and insulation between the electrode terminals and the outer casing.

[0058] Based on this, the applicant discovered that in the existing assembly structure, there is a physical assembly gap or interface gap between the lower insulating component and the sealing ring located inside the casing, near the electrode assembly. During use, the electrolyte inside the battery cell can easily seep in along this gap due to factors such as temperature changes and pressure fluctuations. When the electrolyte fills the gap between the lower insulating component and the sealing ring, the electrolyte, as an ion conductor, will establish an unexpected ion conduction path between the casing wall and the electrode terminals, which should be mutually insulated. This can lead to micro-short circuits or ion migration between the casing and the electrode terminals, causing problems such as decreased insulation resistance, reduced breakdown voltage, and increased self-discharge rate. In severe cases, it may even trigger internal short circuits and thermal runaway, seriously reducing the safety performance and service life of the battery cell.

[0059] In view of this, the present application provides a technical solution that can effectively improve the insulation performance at the electrode terminals and the overall reliability of the battery cell by improving the structure of the insulating component.

[0060] The technical solutions described in this application are applicable to battery devices and electrical equipment using battery devices. Electrical equipment includes, for example, mobile phones, portable devices, laptops, electric vehicles, electric cars, ships, spacecraft, electric toys, and power tools. Spacecraft include, for example, airplanes, rockets, space shuttles, and spacecraft. Electric toys include, for example, stationary or mobile electric toys, specifically, game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include, for example, metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, specifically, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0061] The battery cells and battery devices described in this application are not limited to the electrical equipment described above, but for the sake of brevity, the following embodiments are all illustrated using electric vehicles as an example.

[0062] Please see Figure 1 , Figure 1 This is a simplified schematic diagram of a vehicle provided in some embodiments of this application. The vehicle can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 200 can be installed inside the vehicle 1000; specifically, for example, the battery device 200 can be installed at the bottom, front, or rear of the vehicle 1000. The battery device 200 can be used to power the vehicle 1000; for example, the battery device 200 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 300 and a motor 400. The controller 300, for example, is used to control the battery to supply power to the motor 400. The battery device 200 can be used for starting the vehicle 1000, navigation, etc. Of course, the battery can also be used to drive the vehicle 1000, replacing or partially replacing gasoline or natural gas to provide propulsion for the vehicle 1000.

[0063] Figure 2 This is an exploded schematic diagram of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 200 includes a housing 40 and a battery cell 100, with the battery cell 100 housed within the housing 40.

[0064] The housing 40 is used to accommodate the battery cell 100, and the housing 40 can have various structures. In some embodiments, the housing 40 may include a first housing portion 41 and a second housing portion 42, which overlap each other, and together define a receiving portion 43 for accommodating the battery cell 100. The second housing portion 42 may be a hollow structure with one end open, and the first housing portion 41 may be a plate-like structure, with the first housing portion 41 covering the open side of the second housing portion 42 to form a housing 40 with the receiving portion 43; alternatively, both the first housing portion 41 and the second housing portion 42 may be hollow structures with one side open, with the open side of the first housing portion 41 covering the open side of the second housing portion 42 to form a housing 40 with the receiving portion 43. Of course, the first housing portion 41 and the second housing portion 42 can be various shapes, such as cylinders, cuboids, etc.

[0065] In a battery, there can be one or more battery cells 100. If there are multiple battery cells 100, they can be connected in series, in parallel, or in a mixed configuration. A mixed configuration means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, in parallel, or in a mixed configuration, and then the whole assembly of multiple battery cells 100 is housed in the housing 40. Alternatively, multiple battery cells 100 can first be connected in series, in parallel, or in a mixed configuration to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed configuration to form a whole assembly, which is then housed in the housing 40.

[0066] In some embodiments, there are multiple battery cells 100, which are first connected in series, parallel, or mixed to form a battery module. The multiple battery modules are then connected in series, parallel, or mixed to form a whole and housed within the housing 40.

[0067] Next, we will combine the appendix Figure 3 To be continued Figure 5 The structure of individual battery cells, battery devices, and electrical equipment is described.

[0068] Please refer to the following: Figure 3 and Figure 4 , Figure 3 This is an exploded view of a single battery cell provided in some embodiments of this application. Figure 4 This is a partial cross-sectional schematic diagram of a battery cell provided in some embodiments of this application.

[0069] In a first aspect, this application provides a battery cell 100, including a housing 10, an electrode assembly 20, and a terminal assembly 30. The housing 10 has a first wall 11, and the first wall 11 has a first hole 12 that extends through the housing along its thickness direction X. The electrode assembly 20 is at least partially disposed in the housing 10. The terminal assembly 30 includes an electrode terminal 31, a first insulating member 32, and a second insulating member 33. The terminal assembly 30 is disposed in the first wall 11, the electrode terminal 31 passes through the first hole 12 and is electrically connected to the electrode assembly 20, the first insulating member 32 and the second insulating member 33 are respectively disposed on opposite sides of the first wall 11 in the thickness direction X, and the second insulating member 33 is disposed around the electrode terminal 31. The second insulating member 33 is located on the side of the first wall 11 near the electrode assembly 20 and extends between the electrode terminal 31 and the wall of the first hole 12.

[0070] Furthermore, the second insulating member 33 includes an insulator 331 and a sealing member 332. The insulator 331 surrounds the sealing member 332, and the sealing member 332 is at least partially sandwiched between the hole wall of the first hole 12 and the electrode terminal 31. The insulator 331 and the sealing member 332 abut against each other, and along the thickness direction X, the orthographic projection of the sealing member 332 and the orthographic projection of the insulator 331 partially overlap.

[0071] This application provides a battery cell 100, which includes a housing 10 for providing protection, an electrode assembly 20 for realizing charging and discharging functions, and a terminal assembly 30 for electrically leading out the electrode assembly 20.

[0072] Specifically, the outer casing 10, serving as the external covering structure of the battery cell 100, has a first wall 11. This first wall 11 can be an end cap plate of the outer casing 10 or part of a side wall of the outer casing 10. A first hole 12 is provided on the first wall 11, extending through the casing along its thickness direction X. This first hole 12 allows at least a portion of the terminal assembly 30 to pass through. The electrode assembly 20 is the energy storage core in the battery cell 100 for electrochemical reactions. It is at least partially disposed within the internal cavity of the outer casing 10, which may also contain an electrolyte to facilitate electrochemical reactions.

[0073] Terminal assembly 30 is disposed on first wall 11 and includes electrode terminal 31, first insulating member 32, and second insulating member 33. Electrode terminal 31 passes through first hole 12 and is electrically connected to electrode assembly 20 inside housing 10 for conducting or introducing current. First insulating member 32 and second insulating member 33 are respectively at least partially disposed on opposite sides of first wall 11 in the thickness direction X. First insulating member 32 can be at least partially disposed outside housing 10, while second insulating member 33 can be at least partially disposed inside housing 10. Second insulating member 33 surrounds electrode terminal 31 to achieve insulation isolation between electrode terminal 31 and surrounding structures.

[0074] Furthermore, the second insulating member 33 extends between the electrode terminal 31 and the hole wall of the first hole 12. That is, the second insulating member 33 can be configured such that its main body 334 is located below the inner surface of the first wall 11, that is, on the side of the first wall 11 facing the electrode assembly 20. It also has a portion that extends along the axial direction of the electrode terminal 31, that is, the thickness direction X of the first wall 11, and extends into the first hole 12. This portion of the second insulating member 33 fills the annular gap between the outer wall of the electrode terminal 31 and the inner wall of the first hole 12.

[0075] In this embodiment, the second insulating member 33 can be a composite structure composed of two sub-members. Specifically, the second insulating member 33 may include an insulator sub-member 331 and a sealing sub-member 332 that abut against each other radially along the electrode terminal 31. The sealing sub-member 332 is disposed around the electrode terminal 31, and the insulator sub-member 331 is disposed around the sealing sub-member 332, forming an inner and outer sleeve structure. At the same time, the sealing sub-member 332 is also partially sandwiched radially between the hole wall of the first hole 12 and the electrode terminal 31 to provide isolation between the electrode terminal 31 and the hole wall.

[0076] The insulator 331 abuts against the sealing sub-component 332, and at the abutting ends, the two partially overlap along the orthogonal projection of the thickness direction X. That is, the abutting surface formed by the two abutting against each other can be a plane or curved surface that at least partially intersects with the thickness direction X. For example, it can be a stepped surface with at least one step structure.

[0077] By extending the second insulator 33 into the gap between the electrode terminal 31 and the wall of the first hole 12, the assembly gap that originally existed between the second insulator 33 and the individual sealing ring can be eliminated, blocked, or extended by the material of the second insulator 33 itself. In this case, for the electrolyte to penetrate from the inside of the casing 10 into the gap around the second insulator 33, it must traverse a longer path and be tightly pressed against the interface by the second insulator 33. Therefore, the potential creepage distance for electrolyte penetration can be extended, thereby increasing the breakdown voltage and improving the electrochemical stability and insulation reliability of the battery cell 100 during long-term use.

[0078] In some alternative embodiments, the insulator 331 abuts against the sealing member 332 to form an abutment surface, and the abutment surface surrounds to form a second hole 333. The second hole 333 includes a first sub-hole and a second sub-hole arranged along the axial direction of the electrode terminal 31, and the diameter of the first sub-hole is larger than the diameter of the second sub-hole.

[0079] Furthermore, the insulator 331 and the sealing sub-component 332 abut against each other, thereby forming an abutment surface. This abutment surface itself encloses a second hole 333, through which the electrode terminal 31 passes. The second hole 333 includes two sections, a first sub-hole and a second sub-hole, arranged along the thickness direction X and with different diameters. That is, the hole wall of the second hole 333 has a stepped structure.

[0080] Given the requirement to extend the second insulating element 33 into the first hole 12, configuring the second insulating element 33 as a composite structure consisting of two parts facilitates installation and processing. Furthermore, the sealing sub-element 332 can be made of a material with better elasticity and sealing performance, while the insulator sub-element 331 can be made of a material with better structural strength and insulation performance. The independent molding and subsequent assembly of both further improves insulation reliability and support reliability.

[0081] Furthermore, the contact surface between the insulator 331 and the sealing sub-component 332 forms at least one step structure, which ensures that when the electrolyte permeates along the interface between the two, it must pass through a non-straight, tortuous path with abrupt changes in the direction of extension. This effectively extends the potential permeation path of the electrolyte, increases the permeation resistance, and further improves the insulation reliability.

[0082] In some alternative embodiments, the first sub-hole and the second sub-hole are arranged in a direction from the second insulating member 33 to the first insulating member 32.

[0083] In an embodiment where the second hole 333 includes a first sub-hole and a second sub-hole with unequal diameters, the first and second sub-holes can be arranged along a direction from the second insulator 33 to the first insulator 32. That is, the larger diameter first sub-hole can be located closer to the inner side of the electrode assembly 20, while the smaller diameter second sub-hole is located closer to the outer side of the first wall 11.

[0084] By employing the aforementioned arrangement, the direction of the steps can be defined, allowing the smaller diameter portion of the sealing sub-component 332 to be positioned closer to the first wall 11, and the larger diameter portion to be positioned closer to the electrode assembly 20. In this case, the larger diameter step of the sealing sub-component 332, i.e., the portion located in the first sub-hole, can work together with the first wall 11 to clamp the insulator 331 between its opposite sides in the thickness direction X, providing a stable clamping effect.

[0085] Based on this, after assembly, the sealing component 332 is subjected to radial compression by the insulator 331 and the electrode terminal 31, while the insulator 331 is subjected to radial expansion force of the sealing component 332 and support force of the first wall 11. This enables the entire composite structure to be subjected to balanced and stable forces, thereby further improving the sealing reliability and structural integrity of the composite insulation structure under long-term use and temperature cycling conditions.

[0086] In some optional embodiments, the second hole 333 further includes a third sub-hole, which is disposed on the side of the second sub-hole away from the first sub-hole, and the diameter of the third sub-hole is smaller than the diameter of the second sub-hole.

[0087] Optionally, the second hole 333 may further include a third sub-hole, which is located on the side of the second sub-hole away from the first sub-hole and has a smaller diameter than the second sub-hole. Thus, the contact surface between the insulator 331 and the sealing element 332 can form two steps distributed sequentially along the axial direction, i.e., a structure in which the hole diameter decreases stepwise.

[0088] Understandably, given the size and processing conditions allow, more stepped surfaces can be set at the location of the second hole 333 to form a more complex interface morphology, thereby further extending the electrolyte penetration path.

[0089] By employing the aforementioned second-pore 333 structure with at least three levels of pore size variation, the potential permeation path of the electrolyte can be further extended, and the tortuosity of the path can be increased. If the electrolyte attempts to permeate along this interface, it needs to successively traverse two axial steps and two radial transition surfaces. Therefore, its actual physical crawling path can be extended exponentially, achieving a superior anti-permeation insulation effect compared to a single-step structure.

[0090] In some optional embodiments, the sealing sub-component 332 includes a first sub-part and a second sub-part arranged axially, the first sub-part abutting against the wall of the first sub-hole, and the second sub-part abutting against the wall of the second sub-hole; in the free state, the difference between the diameter of the first sub-hole and the diameter of the second sub-hole is D1, and the difference between the diameter of the first sub-part and the diameter of the second sub-part is D2, and D1 and D2 satisfy: 1.2≤D2 / D1≤1.5.

[0091] Based on the second hole 333 including a first sub-hole and a second sub-hole, the sealing sub-component 332 may correspondingly include a first sub-part and a second sub-part arranged axially. The first sub-part is positioned corresponding to and abutting against the first sub-hole, and the second sub-part is positioned corresponding to and abutting against the second sub-hole. With the second insulating member 33 assembled into the battery cell 100, along the axial direction of the electrode terminal 31, the size of the first sub-part may be the same as or similar to the size of the first sub-hole, and the size of the second sub-part may be the same as or similar to the size of the second sub-hole.

[0092] In the free state, that is, before the insulator 331 and the sealing sub-component 332 are compressed and installed, the difference between the diameter of the first sub-hole and the diameter of the second sub-hole is denoted as D1; ​​at the same time, the difference between the diameter of the first sub-part and the diameter of the second sub-part in the sealing sub-component 332 is denoted as D2. Then D1 and D2 satisfy the relationship: 1.2≤D2:D1≤1.5.

[0093] This relationship defines the relative size between the step width of the sealing sub-component 332 and the step width of the insulator 331 in the radial direction of the electrode terminal 31. Specifically, the radial dimension difference between the first sub-part and the second sub-part of the sealing sub-component 332 is greater than the radial dimension difference between the first sub-hole and the second sub-hole of the insulator 331, but within a certain multiple range.

[0094] Therefore, after the sealing sub-component 332 is pressed into the second hole 333 of the insulator 331 and the assembly is completed, since D2 is greater than D1, the first sub-component relative to the first sub-hole and the second sub-component relative to the second sub-hole will both be subjected to more significant radial compression until their radial width dimensions are equal. At this point, the compression amount of the sealing sub-component 332 is 1.2 to 1.5 times that of the insulator 331. Consequently, at the transition step between the first and second sub-holes, the sealing sub-component 332 will generate a larger amount of compressive deformation that matches that of the insulator 331.

[0095] By employing a dimensional fit that satisfies the aforementioned ratio, the sealing component 332 and the insulator 331 can each withstand a proportional amount of compression when installed and in contact with each other. Specifically, the sealing component 332 is subjected to a quantitatively amplified amount of compression, thereby ensuring that the contact interface between the two is always under high contact stress. Even when the battery operating temperature changes causing thermal expansion and contraction of the materials, this preset interference fit can still maintain a constant and sufficient contact pressure between the sealing component 332 and the insulator 331, thereby further improving insulation and sealing reliability.

[0096] In some optional embodiments, the insulator 331 has a first surface and a second surface that are connected in contact, and the sealing component 332 has a third surface and a fourth surface that are connected in contact, the first surface and the third surface abutting each other to form an abutting surface; the roughness of the first surface is less than the roughness of the second surface, and the roughness of the third surface is less than the roughness of the fourth surface.

[0097] As previously described, the insulator 331 and the sealing member 332 abut against each other to form a stepped abutment surface. Based on this, the insulator 331 may have a first surface and a second surface that are in contact with each other, wherein the first surface is the surface used to form the abutment surface; similarly, the sealing member 332 has a third surface and a fourth surface that are in contact with each other, wherein the third surface is the side surface that abuts against the first surface of the insulator 331 to form the abutment surface.

[0098] It is understood that, depending on the shape of the contact surface, the first surface and the third surface may include multiple intersecting sub-surfaces, which are joined together to form the desired stepped surface.

[0099] Based on this, the roughness of the first surface can be less than that of the second surface, and the roughness of the third surface can be less than that of the fourth surface. That is, among the numerous surfaces of the insulator 331 and the sealing sub-component 332, the two surfaces used for mutual contact are specifically designed to be smoother than the other surfaces. For example, this can be achieved by introducing a surface treatment process after the insulator 331 and the sealing sub-component 332 have been formed.

[0100] Understandably, lower surface roughness results in a larger actual contact area at the microscale between the two mating surfaces, leading to a tighter bond and greater resistance to gas or liquid molecule diffusion along the interface. By ensuring lower roughness on the first and third mating surfaces, the bonding performance of the interface can be improved, resulting in smaller and fewer microscopic gaps between the two components at the interface. This enhances the sealing ability and permeability resistance of the interface to the electrolyte. Simultaneously, other surfaces can retain moderate roughness to facilitate bonding with other components or to save manufacturing costs.

[0101] Please see Figure 5 , Figure 5 This is a partial cross-sectional schematic diagram of a battery cell provided for other embodiments of this application.

[0102] In some optional embodiments, the electrode terminal 31 includes a first segment 311 and a second segment 312. The second segment 312 is connected to the first segment 311 at one end of the electrode terminal 31 axially close to the electrode assembly 20. The first segment 311 passes through the first hole 12. Along the thickness direction X, the orthographic projection of the first wall 11 intersects the orthographic projection of the second segment 312. The terminal assembly 30 also includes a sealing member 34 disposed around the first segment 311. Along the thickness direction X, the sealing member 34 is sandwiched between the second segment 312 and the second insulating member 33.

[0103] In addition to the aforementioned embodiment in which the second insulating member 33 is configured as two independent parts, this application also provides a structural form in which the second insulating member 33 is integrally configured.

[0104] Specifically, the electrode terminal 31 may include a first segment 311 and a second segment 312 arranged along its own axial direction. The second segment 312 is connected to the end of the first segment 311 near the electrode assembly 20, and the radial dimension of the first segment 311 is smaller than that of the second segment 312, forming a stepped structure. The first segment 311 passes through the first hole 12, and the first segment 311 is radially spaced from and insulated from the hole wall of the first hole 12. The second segment 312 is located outside the first hole 12. When viewed along the thickness direction X, the orthographic projection of the first wall 11 intersects with the orthographic projection of the second segment 312, meaning the diameter of the second segment 312 is larger than the diameter of the first hole 12. The second segment 312 may be spaced from and insulated from the first wall 11 along the thickness direction X.

[0105] At this time, the second insulating member 33 can be integrally set, with its main body 334 covering the inner surface of the first wall 11, and its end part extending into the first hole 12 directly through the change of the extension direction of the second insulating member 33. The part extending into the first hole 12 can be used to achieve the barrier and support between the first section 311 and the hole wall of the first hole 12.

[0106] In addition, the terminal assembly 30 further includes at least one seal 34 disposed around the first segment 311. Along the thickness direction X, the seal 34 is sandwiched between the upper surface of the second segment 312 and the lower surface of the second insulator 33. This additional seal 34, located below the second insulator 33, acts as an additional physical barrier, reducing the possibility of electrolyte entering the gap between the second insulator 33 and the electrode terminal 31.

[0107] By employing this structure where the second insulating element 33 extends integrally and a sealing ring is added below it, a composite multi-layer sealing effect can be achieved. The second insulating element 33 itself provides a first line of insulation and sealing between the first wall 11 and the electrode terminal 31, and this line of defense is a structurally reliable integral structure. The sealing element 34, sandwiched between the second section 312 and the second insulating element 33, forms a second line of defense against the gap between the second insulating element 33 and the electrode terminal 31. This further improves the sealing performance of the terminal assembly 30.

[0108] In some alternative embodiments, the terminal assembly 30 includes a plurality of seals 34, one of which is disposed around another.

[0109] Optionally, the terminal assembly 30 may include multiple seals 34, with one of the seals 34 surrounding another, i.e., the seals 34 are arranged in a concentric inner and outer arrangement with different radii.

[0110] Optionally, the multiple seals 34 may have the same or different widths in the radial direction of the electrode terminal 31, and each seal 34 may be matched with the shape of the electrode terminal 31, that is, the cross-sectional shape formed by the electrode terminal 31 in the cross section perpendicular to its own axis is set to further improve the sealing effect and make it easier to install.

[0111] By setting multiple layers of sequentially nested sealing rings, multiple independent sealing lines can be constructed in the radial direction of the electrode terminal 31. Even if the outer sealing element 34 loses some of its sealing effect due to aging or accidental damage, the inner sealing element 34 can still maintain its complete function and independently prevent further infiltration of electrolyte. This redundant sealing structure further improves sealing performance and the long-term reliability of the sealing structure.

[0112] In some optional embodiments, the plurality of seals 34 include a first seal 341 and a second seal 342, wherein the diameter of the first seal 341 is larger than the diameter of the second seal 342, and the first seal 341 is disposed around the second seal 342; in the compressed state in the battery cell 100, along the thickness direction X, the size of the first seal 341 is H1 and the size of the second seal 342 is H2; in the free state, along the thickness direction X, the size of the first seal 341 is H3 and the size of the second seal 342 is H4, then H1 / H3 < H2 / H4.

[0113] Optionally, the terminal assembly 30 may include at least two seals 34, a first seal 341 and a second seal 342, wherein the first seal 341 has a larger diameter and is disposed around the second seal 342, that is, along the radial direction of the electrode terminal 31, the first seal 341 is disposed on the outer side and the second seal 342 is disposed on the inner side.

[0114] Based on this, the compression state of the two seals 34 is further defined. Specifically, when the battery cell 100 is assembled and the two seals 34 are compressed, the actual compressed size of the first seal 341 is denoted as H1 along the thickness direction X, and the actual compressed size of the second seal 342 is denoted as H2. Correspondingly, in the unassembled and uncompressed free state, the original size of the first seal 341 is denoted as H3, and the original size of the second seal 342 is denoted as H4.

[0115] The dimensions described above satisfy the relationship: H1 / H3 < H2 / H4. Here, H1 / H3 represents the remaining compression ratio of the first seal 341, while H2 / H4 represents the remaining compression ratio of the second seal 342. The smaller this ratio, the greater the degree of compression of the seal 34, the stronger its internal elastic restoring force, and consequently, the greater the interfacial contact pressure it withstands.

[0116] The relationship H1 / H3 < H2 / H4 indicates that the compression degree of the outer first seal 341 is greater than that of the inner second seal 342. This allows the outer first seal 341 to withstand greater interfacial pressure, becoming the primary pressure-bearing sealing line and thus providing the most reliable sealing effect. The inner second seal 342, with its relatively smaller compression degree, can be used as a safety redundancy while maintaining good contact between the surfaces on opposite sides in the thickness direction X.

[0117] Optionally, in embodiments where the terminal assembly 30 includes three or more seals 34, the aforementioned residual compression ratio of the outermost seal 34 may be less than the residual compression ratio of all other seals 34, or the residual compression ratio of each seal 34 may be decreased sequentially in a direction from the outside to the inside.

[0118] By subjecting the outer seal 34 to greater interfacial pressure and using the inner seal 34 as a safety redundancy, both sealing performance and structural reliability can be improved. The high-compression outer seal 34 effectively blocks most of the electrolyte permeation pressure. Even if a minor leak occurs in the outer seal 34, the inner seal 34 can still provide an effective supplementary protection. This avoids single-point failure from directly causing loss of sealing function, thereby further improving the overall stability and fault tolerance of the sealing structure.

[0119] In some alternative embodiments, the first seal 341 comprises fluororubber and the second seal 342 comprises silicone rubber.

[0120] Optionally, the seals 34 in the embodiments of this application may all be seals 34 made of elastic rubber material, and each seal 34 may be an integral structure, that is, the material is the same throughout.

[0121] Based on this, the first seal 341 among the multiple seals 34, which is located on the outside and is more easily in contact with the electrolyte, can be made of fluororubber. Fluororubber has excellent chemical corrosion resistance, strong resistance to organic carbonate solvents and lithium salts in the electrolyte, and is not prone to swelling or degradation.

[0122] Meanwhile, the second seal 342, located on the inner side and closer to the electrode terminal 31 among the multiple seals 34, can be made of silicone rubber. Silicone rubber has high high-temperature resistance and good elastic recovery, and can maintain stable elasticity and sealing force over a wide temperature range.

[0123] Specifically, the first seal 341 is located on the outer side, making it more likely to be in direct contact with the internal environment of the housing 10 and more susceptible to direct immersion and corrosion by the electrolyte. The second seal 342 is closer to the electrode terminal 31, which may experience a higher temperature rise during normal operation and under extreme conditions such as short circuits. Therefore, by using a more chemically resistant fluororubber material for the outer seal 34, which is more in contact with the electrolyte, and a more heat-resistant silicone rubber material for the inner seal 34, which is closer to the electrode terminal 31, a good match can be achieved between the material properties and their respective environmental conditions. This further extends the effective service life of the sealing system and improves the sealing and insulation reliability.

[0124] In some alternative embodiments, the second insulating member 33 includes a main body 334 and an extension 335. The main body 334 is disposed on the side of the first wall 11 facing the electrode assembly 20, and the extension 335 is radially sandwiched between the hole wall of the first hole 12 and the electrode terminal 31. In the thickness direction X, the surface of the extension 335 away from the electrode assembly 20 is flush with the surface of the first wall 11 away from the electrode assembly 20.

[0125] Optionally, the second insulating member 33 can be structurally divided into two connected parts, namely, a main body 334 and an extension 335. The main body 334 is disposed on the side of the first wall 11 facing the electrode assembly 20, that is, located in the internal cavity of the housing 10; the extension 335 extends into the first hole 12 along the axial direction of the electrode terminal 31, specifically, it is sandwiched between the hole wall of the first hole 12 and the outer peripheral surface of the electrode terminal 31 along the radial direction of the electrode terminal 31.

[0126] Optionally, in an embodiment where the electrode terminal 31 includes a first section 311 and a second section 312, the main body 334 is sandwiched between the second section 312 and the first wall 11 along the thickness direction X, and the extension 335 is sandwiched between the first section 311 and the hole wall of the first hole 12 along the radial direction of the electrode terminal 31.

[0127] Based on this, the surface of the extension 335 away from the electrode assembly 20, i.e., its top end face, is substantially flush with the surface of the first wall 11 away from the electrode assembly 20, i.e., the upper surface of the first wall 11, and the two are located at the same or similar positions in the thickness direction X. This allows the extension 335 of the second insulating member 33 to penetrate the entire first hole 12 from the inside to the outside along the thickness direction X, thereby completely filling the entire depth space between the hole wall of the first hole 12 and the electrode terminal 31.

[0128] By employing the aforementioned structure where the top of the extension 335 is flush with the outer surface of the first wall 11, a more comprehensive coverage of the potential discharge path between the electrode terminal 31 and the wall of the first hole 12 can be achieved by the insulating material. This allows the second insulating member 33 to more completely cover the bottom surface of the first wall 11 facing the electrode assembly 20 and the hole wall surrounding the first hole 12. This effectively extends the creepage distance between the first wall 11 and the electrode terminal 31, which may lead to electrical breakdown or ion short circuits, thereby further reducing the possibility of short circuits between the electrode terminal 31 and the first wall 11 and improving the insulation reliability of the battery cell 100.

[0129] In some alternative embodiments, along the thickness direction X, the first insulating member 32 is at least partially sandwiched between the electrode terminal 31 and the first wall 11.

[0130] Optionally, the electrode terminal 31 may also have a third section 313 on one side of the electrode assembly 20, similar to the first section 311 and the second section 312. The third section 313 may be located on the side of the first section 311 opposite to the second section 312, and both the second section 312 and the third section 313 may have a larger diameter than the first section 311, so that the overall cross-section of the electrode terminal 31 has a structure similar to the "I" shape. The orthographic projection of the third section 313 along the thickness direction X is the same as the orthographic projection of the first wall 11 along the same direction, that is, the diameter of the third section 313 is larger than the diameter of the first hole 12.

[0131] Based on this, the first insulating member 32 can be partially sandwiched between the third section 313 and the first wall 11 to achieve separation and insulation of the electrode terminal 31 from the first wall 11 on this side. Optionally, the first insulating member 32 can extend its edge near the first hole 12 to the hole wall of the first hole 12 and the first section 311, similar to the second insulating member 33. Alternatively, the first insulating member 32 can extend parallel to the first wall 11 and be sandwiched only between the third section 313 and the first wall 11.

[0132] By employing the aforementioned first insulating component 32 and second insulating component 33 in cooperation, a structure is formed in which all parts of the outer surface of the electrode terminal 31 are spaced apart from and insulated from the first wall 11, which can better achieve an all-round insulation protection effect and further improve the insulation reliability of the battery cell 100.

[0133] Secondly, according to the embodiments of this application, a battery device 200 is provided, including: a housing 40 and a battery cell 100 in any embodiment of the first aspect, wherein the housing 40 encloses to form a receiving portion 43; and a plurality of battery cells 100 are disposed in the receiving portion 43.

[0134] Thirdly, according to the embodiments of this application, an electrical device is provided, including the battery device 200 in any embodiment of the second aspect, the battery device 200 being used to provide electrical energy.

[0135] The battery device 200 and the electrical equipment in this embodiment have all the beneficial effects of the battery cell 100 in the first aspect. For details, please refer to the specific description of the battery cell 100 in the above embodiments. This embodiment will not repeat the description here.

[0136] This application provides a battery cell 100, including a housing 10, an electrode assembly 20, and a terminal assembly 30. The housing 10 has a first wall 11, and the first wall 11 has a first hole 12 that extends through the housing along its thickness direction X. The electrode assembly 20 is at least partially disposed in the housing 10. The terminal assembly 30 includes an electrode terminal 31, a first insulating member 32, and a second insulating member 33. The terminal assembly 30 is disposed on the first wall 11, the electrode terminal 31 passes through the first hole 12 and is electrically connected to the electrode assembly 20, the first insulating member 32 and the second insulating member 33 are respectively disposed on opposite sides of the first wall 11 in the thickness direction X, and the second insulating member 33 is disposed around the electrode terminal 31. The second insulating member 33 is located on the side of the first wall 11 near the electrode assembly 20 and extends between the electrode terminal 31 and the wall of the first hole 12.

[0137] The electrode terminal 31 includes a first section 311 and a second section 312. The second section 312 is connected to the first section 311 at one end of the electrode terminal 31 that is close to the electrode assembly 20 in the axial direction. The first section 311 is inserted into the first hole 12. Along the thickness direction X, the orthographic projection of the first wall 11 intersects with the orthographic projection of the second section 312. The terminal assembly 30 also includes a sealing member 34 surrounding the first section 311. Along the thickness direction X, the sealing member 34 is sandwiched between the second section 312 and the second insulating member 33.

[0138] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. These modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application, and they should all be covered within the scope of the claims and specification of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the embodiments can be combined in any way. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery cell, characterized in that, include: The outer casing has a first wall, and the first wall has a first hole that extends through it along its own thickness direction; The electrode assembly is at least partially disposed within the housing; A terminal assembly includes an electrode terminal, a first insulating member, and a second insulating member. The terminal assembly is disposed on a first wall. The electrode terminal passes through a first hole and is electrically connected to the electrode assembly. The first insulating member and the second insulating member are respectively disposed on opposite sides of the first wall in the thickness direction. The second insulating member surrounds the electrode terminal. The second insulating member is located on the side of the first wall near the electrode assembly and extends between the electrode terminal and the wall of the first hole; The second insulating element includes an insulator and a sealing element. The insulator surrounds the sealing element, and the sealing element is at least partially sandwiched between the hole wall of the first hole and the electrode terminal. The insulator and the sealing element abut against each other, and along the thickness direction, the orthographic projection of the sealing element and the orthographic projection of the insulator partially overlap.

2. The battery cell according to claim 1, characterized in that, The insulator abuts against the sealing component to form an abutment surface, and the abutment surface surrounds to form a second hole. The second hole includes a first sub-hole and a second sub-hole arranged along the axial direction of the electrode terminal. The diameter of the first sub-hole is larger than the diameter of the second sub-hole.

3. The battery cell according to claim 2, characterized in that, The first sub-hole and the second sub-hole are arranged in the direction from the second insulating member to the first insulating member.

4. The battery cell according to claim 2, characterized in that, The second hole also includes a third sub-hole, which is located on the side of the second sub-hole away from the first sub-hole, and the diameter of the third sub-hole is smaller than the diameter of the second sub-hole.

5. The battery cell according to claim 2, characterized in that, The sealing component includes a first sub-part and a second sub-part arranged along the axial direction, the first sub-part abutting against the wall of the first sub-hole, and the second sub-part abutting against the wall of the second sub-hole; In the free state, the difference between the diameter of the first sub-hole and the diameter of the second sub-hole is D1, and the difference between the diameter of the first sub-part and the diameter of the second sub-part is D2. D1 and D2 satisfy: 1.2≤D2 / D1≤1.

5.

6. The battery cell according to claim 2, characterized in that, The insulator has a first surface and a second surface that are connected to each other, and the sealing component has a third surface and a fourth surface that are connected to each other, wherein the first surface and the third surface abut against each other to form the abutting surface; The roughness of the first surface is less than that of the second surface, and the roughness of the third surface is less than that of the fourth surface.

7. The battery cell according to claim 1, characterized in that, The electrode terminal includes a first section and a second section. The second section is connected to the end of the first section that is axially close to the electrode assembly. The first section passes through the first hole. Along the thickness direction, the orthographic projection of the first wall intersects the orthographic projection of the second section. The terminal assembly further includes a seal disposed around the first section, and the seal is sandwiched between the second section and the second insulating member along the thickness direction.

8. The battery cell according to claim 7, characterized in that, The terminal assembly includes a plurality of the seals, one of which is disposed around the other.

9. The battery cell according to claim 8, characterized in that, The plurality of seals include a first seal and a second seal, wherein the diameter of the first seal is larger than the diameter of the second seal, and the first seal is disposed around the second seal; In the compressed state of the battery cell, the size of the first seal is H1 and the size of the second seal is H2 along the thickness direction. In the free state, the size of the first seal is H3 and the size of the second seal is H4 along the thickness direction. Then H1 / H3 < H2 / H4.

10. The battery cell according to claim 9, characterized in that, The first seal comprises fluororubber, and the second seal comprises silicone rubber.

11. The battery cell according to claim 7, characterized in that, The second insulating member includes a main body and an extension. The main body is disposed on the side of the first wall facing the electrode assembly, and the extension is sandwiched between the hole wall of the first hole and the electrode terminal along the radial direction of the electrode terminal. In the thickness direction, the surface of the extension away from the electrode assembly is flush with the surface of the first wall away from the electrode assembly.

12. The battery cell according to claim 1, characterized in that, Along the thickness direction, the first insulating element is at least partially sandwiched between the electrode terminal and the first wall.

13. A battery device, characterized in that, include: The box-shaped enclosure forms a receiving section; The battery cell as described in any one of claims 1-12, wherein a plurality of the battery cells are disposed in the receiving portion.

14. An electrical appliance, characterized in that, Includes the battery device as described in claim 13, the battery device being used to provide electrical energy.

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