Battery cell, battery device, and electric device

Abstract

The application provides a battery monomer, a battery device and a power utilization device. The battery monomer comprises an electrode assembly, a shell and a first insulation piece. The shell comprises a shell body and a cover body. The shell body forms a cavity with an opening. The electrode assembly is located in the cavity. The cover body covers the opening. The cover body is provided with a clamping hole with an opening facing the cavity. The first insulation piece comprises an insulation main body and a connecting structure. The insulation main body is located between the electrode assembly and the cover body. The connecting structure is connected to the surface of the insulation main body facing the cover body. The connecting structure is clamped in the clamping hole. In the above structure, the cover body is provided with the clamping hole with the opening facing the cavity. The connecting structure on the first insulation piece is clamped in the clamping hole to realize the connection of the first insulation piece on the cover body. The first insulation piece can be quickly and conveniently connected to the cover body, and the production efficiency of the battery monomer is improved.

Description

Technical Field

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

[0002] Battery devices have advantages such as high specific energy and high power density, and are widely used in electronic devices and transportation vehicles, such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships and power tools.

[0003] As the application scope of battery devices continues to expand, the market demand for them is also increasing. How to improve the production efficiency of battery devices is receiving increasing attention from those skilled in the art. Utility Model Content

[0004] In view of the above problems, this application provides a battery cell, a battery device, and an electrical device, wherein the battery cell has high production efficiency.

[0005] In a first aspect, this application provides a battery cell, which includes an electrode assembly, a housing, and a first insulating member. The housing includes a shell and a cover, the shell forming a cavity with an opening, the electrode assembly being located in the cavity, the cover being closed to the opening, and the cover having a snap-fit ​​hole with the orifice facing the cavity. The first insulating member includes an insulating body and a connecting structure, the insulating body being located between the electrode assembly and the cover, the connecting structure being connected to the surface of the insulating body facing the cover, and the connecting structure being snap-fitted into the snap-fit ​​hole.

[0006] In the above structure, since the cover is provided with a snap-fit ​​hole facing the cavity, the connection structure on the first insulating member is connected to the cover by snapping with the snap-fit ​​hole, so that the first insulating member can be quickly and easily connected to the cover, thereby improving the production efficiency of the battery cell.

[0007] According to some embodiments of this application, a battery cell has a first protrusion on the inner circumferential surface of the snap-fit ​​hole, and the first protrusion is spaced apart from the bottom surface of the snap-fit ​​hole. The connecting structure includes a protruding body and a limiting protrusion that are connected to each other. The protruding body is connected to the insulating body, and at least part of the protruding body extends into the snap-fit ​​hole. Along the radial direction of the snap-fit ​​hole, the limiting protrusion protrudes from the outer circumferential surface of the protruding body. The limiting protrusion blocks the first protrusion and the bottom surface of the snap-fit ​​hole, restricting the axial displacement of the limiting protrusion in the snap-fit ​​hole. This restricts the axial displacement of the connecting structure in the snap-fit ​​hole, making it difficult for the connecting structure to come out of the snap-fit ​​hole, and ensuring that the connecting structure can maintain a good snap-fit ​​with the snap-fit ​​hole.

[0008] According to some embodiments of this application, the protruding body includes a support portion and a deformable portion. The support portion is connected to the insulating body, and the deformable portion is connected to the end of the support portion away from the insulating body. A limiting boss is disposed on the deformable portion, and the deformable portion can elastically deform to allow the limiting boss to extend into the space between the bottom surface of the first boss and the snap-fit ​​hole.

[0009] By setting the limiting boss on the deformable part, the deformable part can change the position of the limiting boss in the radial direction of the snap-fit ​​hole through elastic deformation. This allows the limiting boss, which extends from the opening of the snap-fit ​​hole, to smoothly avoid the gap between the first boss and the bottom surface of the snap-fit ​​hole. Under the action of elastic restoring force, the limiting boss can be reset in the radial direction of the snap-fit ​​hole, allowing the limiting boss located on the side of the first boss away from the opening along the axial direction of the snap-fit ​​hole to extend into the gap between the first boss and the bottom surface of the snap-fit ​​hole. This ensures that the connecting structure can maintain the snap-fit ​​with the snap-fit ​​hole.

[0010] According to some embodiments of this application, the battery cell, including the insulating body, support, deformable part, and limiting boss, is integrally formed. This not only facilitates the processing and manufacturing of the insulating body, support, deformable part, and limiting boss, but also gives the overall structure formed by the insulating body, support, deformable part, and limiting boss good strength.

[0011] According to some embodiments of this application, the battery cell has at least two deformable portions, which are spaced apart, and each deformable portion has at least one limiting boss.

[0012] According to some embodiments of this application, the battery cell has at least two deformable portions arranged at equal intervals around the central axis of the snap-fit ​​hole. By arranging at least two deformable portions at intervals, a gap is provided between adjacent deformable portions. This gap provides deformation space for the elastic deformation of the deformable portions, allowing the deformable portions to deform in a way that allows the limiting boss to smoothly avoid the first boss. This facilitates the deformation of the deformable portions to allow the limiting boss to extend into the space between the first boss and the bottom surface of the snap-fit ​​hole through elastic deformation.

[0013] According to some embodiments of the present application, the bottom surface of the snap-fit ​​hole is provided with a protrusion, and at least part of the protrusion is engaged with the gap between two adjacent deformable parts, so that the protrusion can fill the gap between two adjacent deformable parts, blocking the deformation of the deformable parts, so that the limiting protrusion is not easy to come out of the space between the first protrusion and the bottom surface of the snap-fit ​​hole due to the deformation of the deformable parts, thereby improving the stability of the connection structure and the snap-fit ​​hole.

[0014] According to some embodiments of the present application, the battery cell is provided with a first protrusion configured as an annular structure extending circumferentially along the inner circumferential surface of the snap-fit ​​hole, such that the limiting protrusion can be inserted into the space between the first protrusion and the bottom surface of the snap-fit ​​hole at any angle in the circumferential direction of the snap-fit ​​hole, so that the connection structure can be snapped into the snap-fit ​​hole.

[0015] According to some embodiments of this application, the battery cell has a chamfered limiting boss, which can reduce the resistance of the connecting structure being inserted into the snap-fit ​​hole, and improve the convenience of connecting the first insulating member and the cover by snapping the connecting structure into the snap-fit ​​hole.

[0016] According to some embodiments of this application, the battery cell includes a cover body and a snap-fit ​​structure. The surface of the cover body facing the cavity is recessed inward to form a recess, and at least part of the snap-fit ​​structure is disposed in the recess. A snap-fit ​​hole is disposed on the snap-fit ​​structure. By disposing of the snap-fit ​​hole on the snap-fit ​​structure, forming the snap-fit ​​hole directly on the cover body is avoided, which helps to reduce the difficulty of forming the snap-fit ​​hole.

[0017] According to some embodiments of this application, the battery cell includes a first bottom surface and a first inner peripheral surface connected to the bottom surface. A second protrusion is provided on the first inner peripheral surface. The second protrusion is spaced apart from the first bottom surface. A partial snap-fit ​​structure is blocked between the second protrusion and the first bottom surface, so that the snap-fit ​​structure can be fixed by the second protrusion and the first bottom surface, thereby improving the firmness of the snap-fit ​​structure in the recess.

[0018] According to some embodiments of this application, the snap-fit ​​structure of the battery cell is an injection-molded structure. By forming the snap-fit ​​structure with snap-fit ​​holes in the recess by injection molding, the difficulty of forming the snap-fit ​​holes can be reduced.

[0019] According to some embodiments of the present application, the melting point of the first insulating component of the battery cell is set to T, where T≥200℃, so that the first insulating component is not easy to melt when the battery cell undergoes thermal runaway, thus giving the first insulating component good reliability and improving the reliability of the battery cell.

[0020] Secondly, this application provides a battery device that includes the battery cells provided by any of the above-described technical solutions. Because the battery device includes the battery cells provided by the above-described technical solutions, the battery device has high production efficiency.

[0021] Thirdly, this application provides an electrical device that includes a battery device provided by any of the above-described technical solutions, wherein the battery is used to provide electrical energy.

[0022] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0023] This application provides a battery cell comprising an electrode assembly, a housing, and a first insulating member. The housing includes a shell and a cover, the shell forming an open cavity. The electrode assembly is located in the cavity, and the cover closes to the opening. The cover has a snap-fit ​​hole with its opening facing the cavity. The first insulating member includes an insulating body and a connecting structure. The insulating body is located between the electrode assembly and the cover, and the connecting structure is connected to the surface of the insulating body facing the cover, snapping into the snap-fit ​​hole. In this structure, because the cover has a snap-fit ​​hole with its opening facing the cavity, the connecting structure on the first insulating member achieves connection of the first insulating member to the cover by snapping into the snap-fit ​​hole, allowing the first insulating member to be quickly and easily connected to the cover, thus improving the production efficiency of the battery cell.

[0024] 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

[0025] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. 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.

[0026] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0027] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application;

[0028] Figure 3 This is a split view of a battery cell provided in some embodiments of this application;

[0029] Figure 4 This is a top view of a cover with a first insulating element provided in some embodiments of this application;

[0030] Figure 5 for Figure 4 Sectional view at FF;

[0031] Figure 6 A schematic diagram of the structure of the first insulating member of a battery cell provided in some embodiments of this application from one view.

[0032] Figure 7 This is a schematic diagram of the structure of the first insulating member of a battery cell provided in some embodiments of this application from another perspective.

[0033] Figure 8 For some embodiments Figure 5 Enlarged view of point I in the middle;

[0034] Figure 9 for Figure 7 Sectional view at point GG;

[0035] Figure 10 For some embodiments Figure 9 Enlarged view of section H in the middle;

[0036] Figure 11 For some other embodiments Figure 5 Enlarged view of point I in the middle.

[0037] In the attached diagram:

[0038] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Accommodation space; 7. Battery cell; 8. Electrode assembly; 9. Outer shell; 91. Housing; 92. Cover; 921. Cover plate body; 9211. Recess; 92111. First bottom surface; 92112. First inner circumferential surface; 92113. Second boss; 922. Snap-fit ​​structure; 923. Snap-fit ​​hole; 9231. First boss; 9232. Protrusion; 10. First insulating component; 101. Insulating body; 102. Connecting structure; 1021. Protruding body; 10211. Support part; 10212. Deformable part; 1022. Limiting boss; 10221. Chamfer; 11. Cavity; 12. Opening. Detailed Implementation

[0039] 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.

[0040] It should be noted that, unless otherwise stated, the technical or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those skilled in the art to which the embodiments of this application pertain.

[0041] 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", "circumferential", etc., 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 do not 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.

[0042] Furthermore, technical terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of the embodiments of this application, "a plurality of" means two or more (including two), unless otherwise explicitly specified.

[0043] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the 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.

[0044] In the description of the embodiments of this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0045] Currently, judging from market trends, the application of battery devices is becoming increasingly widespread. Battery devices are not only used in energy storage power systems such as hydropower, thermal power, wind power, and solar power plants, but also widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in aerospace and other fields.

[0046] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cell assemblies to provide higher voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0047] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0048] A battery cell can be a rechargeable battery cell, which refers to a battery cell that can be recharged after being discharged to activate the active materials and continue to be used.

[0049] Battery cells can be lithium-ion cells, sodium-ion cells, sodium-lithium-ion cells, lithium metal cells, sodium metal cells, lithium-sulfur cells, magnesium-ion cells, nickel-metal hydride cells, nickel-cadmium cells, lead-acid cells, etc.

[0050] 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.

[0051] In some embodiments, the battery cell further 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.

[0052] In some embodiments, the electrolyte includes an electrolyte salt and a solvent.

[0053] 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.

[0054] 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.

[0055] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0056] In some embodiments, a single 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.

[0057] As an example, the battery cell can be a prismatic battery cell, including a prismatic battery cell, a blade-shaped battery cell, or a multi-prism battery, such as a hexagonal prism battery. In the embodiments of this application, the battery cell is a blade-shaped battery cell.

[0058] In some embodiments, the housing includes an end cap and a housing, the housing having an opening, and the end cap covering the opening. The housing may have one or more openings. The end cap may also have one or more.

[0059] The battery device mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells, which are connected in series, parallel, or mixed connections via a busbar.

[0060] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0061] As an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells together to form an independent module. As another example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0062] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0063] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0064] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0065] As an example, the enclosure may include a first enclosure and a second enclosure. The first enclosure and the second enclosure are fastened together to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first enclosure may be a top cover or a bottom plate.

[0066] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0067] 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.

[0068] In some embodiments, the battery device can be used in an energy storage device. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0069] Commonly used square-shell battery cells typically have electrode terminals, insulating components, and explosion-proof valves on their covers. The insulating components are installed directly below the cover, inside the battery cell, and serve to support and insulate the electrode assembly. This reduces the possibility of the cover becoming electrified due to metal components inside the battery cell (such as electrode terminals, adapters, and tabs) touching the cover.

[0070] In existing technologies, insulating components are typically injection molded from polypropylene and then heat-fused to the cover. These insulating components generally serve functions such as isolating the electrode assembly from the cover, supporting the electrode assembly, preventing electrode terminal rotation, and providing heat-fusion points for the insulating film of the electrode assembly. However, when a battery cell experiences thermal runaway, the internal temperature can rise sharply to over 150°C to 200°C. This extremely high temperature can easily melt the insulating components attached to the cover.

[0071] In some cases, the insulating component is injection molded from a high-melting-point material (melting point greater than or equal to 200°C) and then directly heat-fused onto the cover. However, in this approach, the insulating component is difficult to heat-fuse onto the cover, resulting in poor quality and low efficiency of the heat-fusion connection between the insulating component and the cover.

[0072] To improve the production efficiency of battery cells, some embodiments of this application provide a battery cell including an electrode assembly, a housing, and a first insulating member. The housing includes a shell and a cover, forming a cavity with an opening. The electrode assembly is located in the cavity, and the cover closes to the opening. The cover has a snap-fit ​​hole with its opening facing the cavity. The first insulating member includes an insulating body and a connecting structure. The insulating body is located between the electrode assembly and the cover, and the connecting structure is connected to the surface of the insulating body facing the cover, snapping into the snap-fit ​​hole. In the above structure, because the cover has a snap-fit ​​hole with its opening facing the cavity, the connecting structure on the first insulating member achieves the connection of the first insulating member to the cover by snapping into the snap-fit ​​hole, allowing the first insulating member to be quickly and easily connected to the cover, thus improving the production efficiency of the battery cell.

[0073] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0074] Electrical devices can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, among others. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc.

[0075] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0076] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0077] like Figure 1 As shown, a battery device 2 is installed inside the vehicle 1. The battery device 2 can be located at the bottom, front, or rear of the vehicle 1. The battery device 2 can be used to power the vehicle 1; for example, the battery device 2 can serve as the operating power source for the vehicle 1.

[0078] The vehicle 1 may also include a controller 3 and a motor 4. The controller 3 is used to control the battery device 2 to supply power to the motor 4, for example, for the power needs of the vehicle 1 during starting, navigation and driving.

[0079] In some embodiments of this application, the battery device 2 can not only serve as the operating power source for the vehicle 1, but also as the driving power source for the vehicle 1, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1.

[0080] Figure 2 This is a exploded view of a battery device provided in some embodiments of this application. For example... Figure 2 As shown, the battery device 2 includes a housing 5 and battery cells 7, with the battery cells 7 housed within the housing 5. The battery cell 7 can be the smallest unit that makes up a battery.

[0081] The housing 5 is used to house the battery cell 7, and the housing 5 can have various structures. In some embodiments, the housing 5 may include a first housing portion 5a and a second housing portion 5b, which overlap each other, and together define a housing space 5c for housing the battery cell 7. The second housing portion 5b may be a hollow structure with one end open, and the first housing portion 5a may be a plate-like structure, with the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c; alternatively, both the first housing portion 5a and the second housing portion 5b may be hollow structures with one side open, with the open side of the first housing portion 5a covering the open side of the second housing portion 5b to form a housing 5 with the housing space 5c. Of course, the first housing portion 5a and the second housing portion 5b can be various shapes, such as cylinders, cuboids, etc.

[0082] To improve the sealing performance after the first housing part 5a and the second housing part 5b are connected, a sealing element, such as sealant or sealing ring, can also be provided between the first housing part 5a and the second housing part 5b.

[0083] Assuming that the first box section 5a covers the top of the second box section 5b, the first box section 5a can also be called the upper box cover, and the second box section 5b can also be called the lower box.

[0084] In the battery device 2, there can be one or more battery cells 7. If there are multiple battery cells 7, they can be connected in series, in parallel, or in a mixed manner. A mixed connection means that multiple battery cells 7 are connected in both series and parallel. Multiple battery cells 7 can be directly connected in series, in parallel, or in a mixed manner, and then the whole assembly of multiple battery cells 7 is housed in the housing 5. Alternatively, multiple battery cells 7 can first be connected in series, in parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, in parallel, or in a mixed manner to form a whole assembly, which is then housed in the housing 5.

[0085] Some embodiments of this application provide a battery cell 7, see reference Figure 3The battery cell 7 includes an electrode assembly 8, a housing 9, and a first insulating member 10. The housing 9 includes a shell 91 and a cover 92. The shell 91 forms a cavity 11 with an opening 12. The electrode assembly 8 is located in the cavity 11, and the cover 92 closes to the opening 12. (Reference) Figure 4 and Figure 5 The cover 92 is provided with a snap-fit ​​hole 923 with its opening facing the cavity 11; Reference Figure 6 and Figure 7 The first insulating element 10 includes an insulating body 101 and a connecting structure 102. The insulating body 101 is located between the electrode assembly 8 and the cover 92. The connecting structure 102 is connected to the surface of the insulating body 101 facing the cover 92 and is snapped into the snap-fit ​​hole 923.

[0086] Electrode assembly 8 is a component in the battery cell 7 where an electrochemical reaction occurs. The housing 9 may contain one or more electrode assemblies 8. Electrode assembly 8 may include an electrode body and tabs. The tabs extend from the side of the electrode body facing the cover 92 and are used to connect to electrode terminals on the cover 92, enabling the electrode assembly 8 to be electrically connected to external electrical devices or charging devices via the electrode terminals.

[0087] The electrode assembly 8 may include a positive electrode, a negative electrode, and a separator. The positive and negative electrodes can serve as the positive and negative electrodes, respectively. During the charging and discharging process of the battery cell 7, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is stacked between the positive and negative electrodes to isolate them, preventing short circuits while allowing active ions to pass through.

[0088] The outer casing 9 may be a component in the battery cell 7 used to form a sealed space, which is used to house other components such as the electrode assembly 8 in the battery cell 7.

[0089] The housing 91 and the cover 92 are two interconnected parts of the outer shell 9. The housing 91 forms a cavity 11 with an opening 12 at one end, which not only allows components such as the electrode assembly 8 and the first insulating member 10 to be placed in the cavity 11, but also allows components such as the electrode assembly 8 to be easily inserted into the cavity 11 through the opening 12. The cover 92 is a part used to seal the opening 12. It seals and covers the housing 91 to form a sealed space in the cavity 11. The cover 92 can be welded to the housing 91 to seal the opening 12.

[0090] The snap-fit ​​hole 923 can be a hole-like structure for snapping the cover 92 with the first insulating member 10. The snap-fit ​​hole 923 is provided on the cover 92 and its opening is oriented towards the cavity 11, so that the first insulating member 10 can be connected to the side of the cover 92 facing the cavity 11 through the snap-fit ​​hole 923.

[0091] The first insulating member 10 may be an insulating member disposed on the side of the cover 92 facing the cavity 11, which is used to insulate and isolate the cover 92 from devices such as the electrode assembly 8 in the cavity 11.

[0092] The insulating body 101 is the main structure of the first insulating member 10, used to insulate and isolate the cover 92 from the electrode assembly 8 and other devices in the cavity 11. The connecting structure 102 is the structure in the first insulating member 10 used to connect to the cover 92. By connecting the connecting structure 102 to the surface of the insulating body 101 facing the cover 92, the first insulating member 10 can be easily connected to the cover 92 via the connecting structure 102. The connecting structure 102 snaps into the snap-fit ​​hole 923, meaning that at least a portion of the connecting structure 102 extends into and snaps into the snap-fit ​​hole 923. By having the connecting structure 102 snap into the snap-fit ​​hole 923, the first insulating member 10 can be easily and quickly connected to the side of the cover 92 facing the cavity 11 via the connecting structure 102, which helps to improve the connection efficiency of the first insulating member 10 on the cover 92.

[0093] In the above structure, since the cover 92 is provided with a snap-fit ​​hole 923 facing the cavity 11, the connection structure 102 on the first insulating member 10 is connected to the cover 92 by snapping with the snap-fit ​​hole 923, so that the first insulating member 10 can be quickly and conveniently connected to the cover 92, thereby improving the production efficiency of the battery cell 7.

[0094] In some embodiments, reference Figure 8 A first protrusion 9231 is provided on the inner circumferential surface of the snap-fit ​​hole 923, and the first protrusion 9231 is spaced apart from the bottom surface of the snap-fit ​​hole 923; Reference Figure 9 The connecting structure 102 includes a protruding body 1021 and a limiting boss 1022 that are interconnected. The protruding body 1021 is connected to the insulating body 101. (Continuing to refer to...) Figure 8 At least part of the protruding body 1021 extends into the snap-fit ​​hole 923. Along the radial direction of the snap-fit ​​hole 923, the limiting boss 1022 protrudes from the outer peripheral surface of the protruding body 1021 and blocks the first boss 9231 and the bottom surface of the snap-fit ​​hole 923.

[0095] The first protrusion 9231 can be a protruding structure on the inner circumferential surface of the snap-fit ​​hole 923, which is used to form a stepped structure on the inner circumferential surface of the snap-fit ​​hole 923 to prevent the connecting structure 102 from dislodging from the snap-fit ​​hole 923. The first protrusion 9231 and the bottom surface of the snap-fit ​​hole 923 are spaced apart, which means that a gap is formed between the first protrusion 9231 and the bottom surface of the snap-fit ​​hole 923. This gap can accommodate part of the connecting structure 102 so that the connecting structure 102 is not easily dislodged from the snap-fit ​​hole 923.

[0096] The protruding body 1021 can be the main structure in the connecting structure 102, which is used to set the limiting boss 1022 and allow the limiting boss 1022 to extend into the gap between the first boss 9231 and the bottom surface of the snap-fit ​​hole 923. By connecting the protruding body 1021 to the insulating body 101 and allowing at least a portion of the protruding body 1021 to extend into the snap-fit ​​hole 923, the protruding body 1021 can extend the limiting boss 1022 into the snap-fit ​​hole 923.

[0097] The limiting boss 1022 can be a structure that protrudes from the main body 1021 and is blocked between the bottom surface of the first boss 9231 and the snap-fit ​​hole 923, so as to reduce the possibility of the connecting structure 102 disengaging from the snap-fit ​​hole 923. By making the limiting boss 1022 protrude from the outer peripheral surface of the protruding body 1021 along the radial direction of the locking hole 923, when the limiting boss 1022 extends into the locking hole 923 along with the protruding body 1021, the limiting boss 1022 can extend to the gap between the bottom surface of the first boss 9231 and the locking hole 923 and be blocked by the bottom surface of the first boss 9231 and the locking hole 923. This restricts the axial displacement of the limiting boss 1022 in the locking hole 923, thereby limiting the axial displacement of the connecting structure 102 in the locking hole 923. As a result, the connecting structure 102 is not easy to come out of the locking hole 923, and the connecting structure 102 can maintain good engagement with the locking hole 923.

[0098] In some embodiments, reference Figure 10 The protruding body 1021 includes a support portion 10211 and a deformable portion 10212. The support portion 10211 is connected to the insulating body 101, and the deformable portion 10212 is connected to the end of the support portion 10211 away from the insulating body 101. A limiting boss 1022 is disposed on the deformable portion 10212. The deformable portion 10212 can elastically deform to allow the limiting boss 1022 to slide into the space between the bottom surface of the first boss 9231 and the snap-fit ​​hole 923.

[0099] The support portion 10211 may be a major structural part of the protruding body 1021, which is used to support the deformable portion 10212 and the limiting boss 1022. By connecting the support portion 10211 to the surface of the insulating body 101 facing the cover 92, and connecting the deformable portion 10212 to the end of the support portion 10211 away from the insulating body 101, the support portion 10211 can support the deformable portion 10212 and the limiting boss 1022 connected to the deformable portion 10212, and can allow the deformable portion 10212 and the limiting boss 1022 connected to the deformable portion 10212 to extend into the snap-fit ​​hole 923.

[0100] The deformable portion 10212 can be a structural part that protrudes from the main body 1021 and is capable of elastic deformation. By providing the limiting boss 1022 on the deformable portion 10212, the deformable portion 10212 can change the position of the limiting boss 1022 in the radial direction of the locking hole 923 through elastic deformation, so that the limiting boss 1022 extending from the opening of the locking hole 923 can smoothly avoid the gap between the first boss 9231 and the bottom surface of the locking hole 923; and under the action of elastic restoring force, the limiting boss 1022 can be reset in the radial direction of the locking hole 923, so that the limiting boss 1022 located on the side of the first boss 9231 away from the opening along the axial direction of the locking hole 923 can extend into the gap between the first boss 9231 and the bottom surface of the locking hole 923, so that the connecting structure 102 can maintain the locking with the locking hole 923.

[0101] For example, the connecting structure 102 is an injection molded part. The connecting structure 102 is formed by injection molding using plastic material, which not only gives the connecting structure 102 good overall structural strength, but also gives the deformable part 10212 made of plastic material good elastic deformation capability.

[0102] In some embodiments, the insulating body 101, the support portion 10211, the deformable portion 10212, and the limiting boss 1022 are configured as an integrally formed structure.

[0103] The insulating body 101, the support part 10211, the deformable part 10212, and the limiting boss 1022 can be manufactured by integral molding methods such as injection molding. This allows the insulating body 101, the support part 10211, the deformable part 10212, and the limiting boss 1022 to be manufactured as a whole and synchronously. This not only makes the processing and manufacturing of the insulating body 101, the support part 10211, the deformable part 10212, and the limiting boss 1022 convenient, but also makes the overall structure formed by the insulating body 101, the support part 10211, the deformable part 10212, and the limiting boss 1022 have good strength.

[0104] In some embodiments, at least two deformable portions 10212 are provided, and the at least two deformable portions 10212 are spaced apart. Each deformable portion 10212 is provided with at least one limiting boss 1022.

[0105] By providing at least two deformable portions 10212 and at least one limiting boss 1022 on each deformable portion 10212, the connecting structure 102 can be engaged with the snap-fit ​​hole 923 through at least two limiting bosses 1022, which helps to improve the connection strength between the connecting structure 102 and the snap-fit ​​hole 923.

[0106] By spaced at least two deformable portions 10212, a gap is provided between adjacent deformable portions 10212. This gap provides deformation space for the elastic deformation of the deformable portion 10212, allowing the deformable portion 10212 to deform so that the limiting boss 1022 can smoothly avoid the first boss 9231. This facilitates the deformation of the deformable portion 10212 to allow the limiting boss 1022 to extend into the space between the bottom surface of the first boss 9231 and the snap-fit ​​hole 923 through elastic deformation.

[0107] In some embodiments, at least two deformable portions 10212 are equally spaced around the central axis of the snap-fit ​​hole 923.

[0108] At least two deformable portions 10212 are equally spaced around the central axis of the snap-fit ​​hole 923. This can mean that at least two deformable portions 10212 are arranged around the same circumference with the central axis of the snap-fit ​​hole 923 as the center, and the interval between any two adjacent deformable portions 10212 is equal.

[0109] In some embodiments, the bottom surface of the snap-fit ​​hole 923 is provided with a protrusion 9232, and at least a portion of the protrusion 9232 is engaged in the gap between two adjacent deformable portions 10212.

[0110] The protrusion 9232 can be a structure used to fill the deformation space of the deformable part 10212 when the limiting protrusion 1022 extends into the space between the bottom surface of the first protrusion 9231 and the snap-fit ​​hole 923. It can reduce the possibility of deformation of the deformable part 10212 when the limiting protrusion 1022 extends into the space between the bottom surface of the first protrusion 9231 and the snap-fit ​​hole 923, and help reduce the possibility of the limiting protrusion 1022 coming out of the space between the bottom surface of the first protrusion 9231 and the snap-fit ​​hole 923.

[0111] By providing a protrusion 9232 on the bottom surface of the snap-fit ​​hole 923, and having at least a portion of the protrusion 9232 engage with the gap between two adjacent deformable parts 10212, the protrusion 9232 can fill the gap between the two adjacent deformable parts 10212, blocking the deformation of the deformable part 10212. This makes it less likely for the limiting boss 1022 to come out of the space between the first boss 9231 and the bottom surface of the snap-fit ​​hole 923 due to the deformation of the deformable part 10212, thereby improving the stability of the engagement between the connecting structure 102 and the snap-fit ​​hole 923.

[0112] In some embodiments, the first boss 9231 is configured as an annular structure extending circumferentially along the inner peripheral surface of the snap hole 923.

[0113] By configuring the first protrusion 9231 as an annular structure extending circumferentially along the inner circumferential surface of the snap-fit ​​hole 923, the first protrusion 9231 forms a complete annular step on the inner circumferential surface of the snap-fit ​​hole 923, so that the limiting protrusion 1022 can be inserted into the space between the first protrusion 9231 and the bottom surface of the snap-fit ​​hole 923 at any angle in the circumferential direction of the snap-fit ​​hole 923, so that the connection structure 102 can be snapped into the snap-fit ​​hole 923.

[0114] For example, the end face of the first protrusion 9231 near the opening of the snap-fit ​​hole 923 can be flush with the opening of the snap-fit ​​hole 923; the end face of the first protrusion 9231 near the opening of the snap-fit ​​hole 923 can be spaced apart from the opening of the snap-fit ​​hole 923.

[0115] In some embodiments, the limiting boss 1022 is provided with a chamfer 10221.

[0116] The limiting boss 1022 is provided with a chamfer 10221, which means that the end of the limiting boss 1022 away from the protruding body 1021 has a chamfer 10221 at the outer edge of the locking hole 923 in the radial direction. By providing a chamfer 10221 on the limiting boss 1022, the chamfer 10221 can play a guiding role when the limiting boss 1022 is inserted into the locking hole 923 along with the protruding body 1021. This can reduce the resistance of the connecting structure 102 being installed in the locking hole 923, and improve the convenience of connecting the first insulating member 10 and the cover 92 by engaging the connecting structure 102 with the locking hole 923.

[0117] In some embodiments, reference Figure 11 The cover body 92 includes a cover plate body 921 and a snap-fit ​​structure 922. The surface of the cover plate body 921 facing the cavity 11 is recessed inward to form a recess 9211. At least part of the snap-fit ​​structure 922 is disposed in the recess 9211, and the snap-fit ​​hole 923 is disposed in the snap-fit ​​structure 922.

[0118] The cover body 921 can be the main structure in the cover 92, and the snap-fit ​​structure 922 can be a structure in the cover for forming the snap-fit ​​hole 923. The recess 9211 can be a structure in the cover body 921 for providing the snap-fit ​​structure 922, which can form a space to accommodate at least a portion of the snap-fit ​​structure 922. By recessing the recess 9211 inward from the surface of the cover body 921 toward the cavity 11, the snap-fit ​​structure 922, which is at least partially provided in the recess 9211, can be provided close to the first insulating member 10.

[0119] The snap-fit ​​hole 923 is provided in the snap-fit ​​structure 922, which means that the snap-fit ​​hole 923 on the cover 92 is opened in the snap-fit ​​structure 922 and the opening of the snap-fit ​​hole 923 is set towards the cavity 11, so that the connecting structure 102 of the first insulating member 10 can extend into the snap-fit ​​hole 923 and snap-fit.

[0120] Because the snap-fit ​​hole 923 used for engaging with the connecting structure 102 requires the inclusion of structures such as a first boss 9231, its internal structure is relatively complex. Furthermore, the cover plate body 921, which is the main structure of the cover 92, is typically made of steel, making it difficult to directly form the snap-fit ​​hole 923 on the cover plate body 921. By placing the snap-fit ​​hole 923 on the snap-fit ​​structure 922, and setting the snap-fit ​​hole 923 on the snap-fit ​​structure 922, the direct formation of the snap-fit ​​hole 923 on the cover plate body 921 is avoided, thus reducing the difficulty of forming the snap-fit ​​hole 923.

[0121] In some embodiments, the recess 9211 includes a first bottom surface 92111 and a first inner peripheral surface 92112 connected to the bottom surface. A second protrusion 92113 is provided on the first inner peripheral surface 92112. The second protrusion 92113 is spaced apart from the first bottom surface 92111. A partial snap-fit ​​structure 922 is blocked between the second protrusion 92113 and the first bottom surface 92111.

[0122] The first bottom surface 92111 can be the bottom surface of the recess 9211 that is away from the cover plate body 921 and faces the cavity 11. The first inner peripheral surface 92112 can be the inner peripheral surface of the recess 9211 that is connected to the first bottom surface 92111. The second boss 92113 can be a structure that protrudes from the first inner peripheral surface 92112 into the recess 9211. By setting the second boss 92113 and the first bottom surface 92111 at intervals along the thickness direction of the cover plate body 921, part of the snap-fit ​​structure 922 is located in the space between the second boss 92113 and the first bottom surface 92111, so that the snap-fit ​​structure 922 can be fixed by the second boss 92113 and the first bottom surface 92111, thereby improving the firmness of the snap-fit ​​structure 922 in the recess 9211.

[0123] In some embodiments, the snap-fit ​​structure 922 is an injection-molded structure.

[0124] The snap-fit ​​structure 922 is an injection-molded structure, meaning that the snap-fit ​​structure 922 can be formed in the recess 9211 by injection molding. Since the cover plate body 921, which is the main structure of the cover body 92, is usually a high-strength structure, it is quite difficult to directly form the snap-fit ​​hole 923 in the cover plate body 921. By forming the snap-fit ​​structure 922 with the snap-fit ​​hole 923 in the recess 9211 by injection molding, the difficulty of forming the snap-fit ​​hole 923 can be reduced.

[0125] For example, the cover body 921 is a steel structure, which helps to improve the structural strength of the cover 92, thereby improving the structural strength of the outer shell 9 and improving the protective capability of the outer shell 9.

[0126] In some embodiments, the snap-fit ​​structure 922 may be formed in the recess 9211 by injection molding of polypropylene material.

[0127] In some embodiments, the melting point of the first insulating element 10 is set to T, where T ≥ 200°C.

[0128] By setting the melting point T of the first insulating component 10 to a range of T≥200℃, the first insulating component 10 is less likely to melt when the battery cell 7 experiences thermal runaway, thus giving the first insulating component 10 good reliability and improving the reliability of the battery cell 7.

[0129] For example, the first insulating element 10 can be made of materials such as polyimide, liquid crystal polymer, polytetrafluoroethylene, polyether ether ketone, polyphenylene sulfide, polyoxymethylene, and polyamide, so that the first insulating element 10 not only has good insulation properties, but also is not easy to melt when the battery cell 7 experiences thermal runaway, thereby improving the reliability of the battery cell 7.

[0130] Some embodiments of this application also provide a battery device 2, which includes the battery cell 7 provided in the above-described technical solution. Because the battery device 2 includes the battery cell 7 provided in the above-described technical solution, the battery device 2 has high production efficiency.

[0131] Some embodiments of this application also provide an electrical device, which includes the battery device 2 provided by the above-described technical solution, and the battery device 2 is used to provide electrical energy.

[0132] The electrical device can be any of the aforementioned devices or systems that utilize battery device 2.

[0133] Some embodiments of this application provide a battery cell 7, which includes an electrode assembly 8, a housing 9, and a first insulating member 10. The housing 9 includes a shell 91 and a cover 92. The shell 91 forms a cavity 11 with an opening 12. The electrode assembly 8 is located in the cavity 11. The cover 92 covers the opening 12 and has a snap-fit ​​hole 923 with its opening facing the cavity 11. A first boss 9231 is protruding from the inner circumferential surface of the snap-fit ​​hole 923, and the first boss 9231 is spaced apart from the bottom surface of the snap-fit ​​hole 923. In the connecting structure 102, a support portion 10211 protruding from the main body 1021 is connected to the insulating main body 101. A deformable portion 10212 extends into the snap-fit ​​hole 923. A limiting boss 1022 protrudes radially from the outer circumferential surface of the deformable portion 10212 of the snap-fit ​​hole 923, and the limiting boss 1022 blocks the first boss 9231 and the bottom surface of the snap-fit ​​hole 923. In the above structure, since the cover 92 is provided with a snap-fit ​​hole 923 facing the cavity 11, the connection structure 102 on the first insulating member 10 is connected to the cover 92 by snapping with the snap-fit ​​hole 923, so that the first insulating member 10 can be quickly and conveniently connected to the cover 92, thereby improving the production efficiency of the battery cell 7.

[0134] 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: Electrode assembly; The housing includes a shell and a cover, the shell forming a cavity with an opening, the electrode assembly being located in the cavity, the cover closing onto the opening, and the cover having a snap-fit ​​hole with an opening facing the cavity; The first insulating element includes an insulating body and a connecting structure. The insulating body is located between the electrode assembly and the cover. The connecting structure is connected to the surface of the insulating body facing the cover and is snapped into the snap-fit ​​hole.

2. The battery cell according to claim 1, characterized in that, A first boss is provided on the inner circumferential surface of the snap-fit ​​hole, and the first boss is spaced apart from the bottom surface of the snap-fit ​​hole; the connecting structure includes a protruding body and a limiting boss connected to each other, the protruding body is connected to the insulating body, at least part of the protruding body extends into the snap-fit ​​hole, and along the radial direction of the snap-fit ​​hole, the limiting boss protrudes from the outer circumferential surface of the protruding body, and the limiting boss blocks the space between the first boss and the bottom surface of the snap-fit ​​hole.

3. The battery cell according to claim 2, characterized in that, The protruding body includes a support portion and a deformable portion. The support portion is connected to the insulating body, and the deformable portion is connected to the end of the support portion away from the insulating body. The limiting boss is disposed on the deformable portion, and the deformable portion can elastically deform to allow the limiting boss to extend into the space between the bottom surface of the first boss and the snap-fit ​​hole.

4. The battery cell according to claim 3, characterized in that, The insulating body, support, deformation part and limiting boss are integrally formed.

5. The battery cell according to claim 3 or 4, characterized in that, The deformable part is provided in at least two, and the at least two deformable parts are arranged at intervals. Each deformable part is provided with at least one limiting boss.

6. The battery cell according to claim 5, characterized in that, The at least two deformable portions are arranged at equal intervals around the central axis of the snap-fit ​​hole.

7. The battery cell according to claim 5, characterized in that, The bottom surface of the snap-fit ​​hole is provided with a protrusion, and at least part of the protrusion is fitted into the gap between two adjacent deformable parts.

8. The battery cell according to claim 2, characterized in that, The first boss is configured as an annular structure extending circumferentially along the inner peripheral surface of the snap-fit ​​hole.

9. The battery cell according to claim 2, characterized in that, The limiting boss has a chamfer.

10. The battery cell according to claim 1, characterized in that, The cover includes a cover plate body and a snap-fit ​​structure. The surface of the cover plate body facing the cavity is recessed inward to form a recess. At least part of the snap-fit ​​structure is disposed in the recess, and the snap-fit ​​hole is disposed in the snap-fit ​​structure.

11. The battery cell according to claim 10, characterized in that, The recess includes a first bottom surface and a first inner peripheral surface connected to the bottom surface. A second protrusion is provided on the first inner peripheral surface. The second protrusion is spaced apart from the first bottom surface. Part of the snap-fit ​​structure is blocked between the second protrusion and the first bottom surface.

12. The battery cell according to claim 10, characterized in that, The snap-fit ​​structure is an injection-molded structure.

13. The battery cell according to claim 1, characterized in that, The melting point of the first insulating component is set to T, where T ≥ 200℃.

14. A battery device, characterized in that, The battery cell as described in any one of claims 1-13.

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

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