Battery cell, battery device, and electric device

Abstract

Some embodiments of the present application provide a battery cell, a battery device and a power consumption device. The first insulation member of the battery cell comprises a first main body part and a first folded part. The first main body part covers the outer circumferential surface of the shell. The first folded part is bent relative to the first main body part and covers the outer side of the cover. The connecting part of the second insulation member is located on the outer side of the shell and attached to the first main body part. The main body part is located on the outer side of the cover and across the edge of the first folded part. The main body part forms a notch groove or the main body part forms a notch groove. The notch groove is in communication with the outer surface of the cover and used to accommodate the adhesive member adhered to the cover. Since the connecting part connected on the main body part is attached to the first main body part, it can provide additional connecting force for the second insulation member, so that the second insulation member can press the first folded part more firmly on the outer surface of the cover, so that the first insulation member is not easy to be raised, which is beneficial to improve the reliability of the battery cell.

Description

Technical Field

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

[0002] Battery 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 battery devices are used more frequently in people's lives, improving their reliability is attracting 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 first insulating member of the battery cell is not easy to lift, so that the battery cell has good reliability.

[0005] In a first aspect, some embodiments of this application provide a battery cell, which includes an electrode assembly, a housing, a first insulating member, and a second insulating member. The housing includes a shell and a cover, the shell forming a first cavity with a first opening, the cover closing the first opening, and the electrode assembly located in the first cavity. The first insulating member includes a first main body portion and a first folded portion, the first main body portion covering the outer peripheral surface of the shell, and the first folded portion bending relative to the first main body portion and covering the outside of the cover. The second insulating member includes a main body portion and a connecting portion connected to each other, the connecting portion being located outside the shell and attached to the first main body portion, the main body portion being located outside the cover, a portion of the main body portion covering the cover from the outside, and another portion of the main body portion covering the first folded portion from the outside, the main body portion and the first folded portion forming a notch or groove, or the main body portion forming a notch or groove, the notch or groove communicating with the outer surface of the cover, and the notch or groove being used to accommodate an adhesive member bonded to the cover.

[0006] In the above structure, the main body of the second insulating member is located on the outside of the cover. A portion of the main body covers the cover, and another portion covers the first folded portion, thus covering the first folded portion and making it less prone to lifting. Because the connecting portion on the main body is attached to the first main body, it provides additional connecting force to the second insulating member, allowing it to more firmly press the first folded portion onto the outer surface of the cover. This enables the first insulating member to stably perform its insulating and isolating function, reducing the possibility of short circuits between the casing and external devices, and improving the reliability of the battery cell.

[0007] According to some embodiments of this application, the battery cell includes a cover comprising a first part, a second part, and a third part. The second part is closer to the electrode assembly than the first part, and the third part is bent toward the electrode assembly relative to the first part. The third part is connected between the first part and the second part. The first part, the third part, and the second part are arranged sequentially along the length of the cover. The main body includes a first cover part, a second cover part, and a third cover part. The third cover part is connected between the first cover part and the second cover part. The first cover part is located outside the first part, the second cover part is located outside the second part, and the third cover part is located outside the third part. A connecting part is connected to the third cover part. By connecting the connecting part to the third cover part, the third cover part can better receive the additional connecting force provided by the connecting part, allowing the third cover part to more firmly press the first folded part onto the outer surface of the third part, thus improving the effect of reducing the lifting of the first folded part.

[0008] According to some embodiments of this application, the area of ​​the connecting portion of the battery cell is set to D = 25 mm. 2 ≤D≤100mm 2 This not only ensures that the connecting part has sufficient area to provide enough connecting force to apply pressure to the main body, enabling the main body to effectively press the first folding part, but also prevents the connecting part from wasting material due to excessive area and affecting the arrangement of other surrounding components.

[0009] According to some embodiments of the present application, the battery cell has the size of the first covering part set to E and the size of the first part set to F in the length direction of the cover, with 0.3≤E / F≤0.7. This not only allows the first covering part to cover enough area of ​​the first part to cover and press the first folded part on the first part, reducing the possibility of the first folded part lifting, but also allows enough area to be exposed on the outer surface of the first part to bond the adhesive, so that the adhesive can be firmly connected to the cover.

[0010] According to some embodiments of the present application, the size of the first covering part in the length direction of the cover is set to E, 5mm≤E≤12mm. This not only allows the first covering part to cover a sufficient area of ​​the first part to cover and press the first folded part on the first part, reducing the possibility of the first folded part lifting up, but also allows sufficient area to be exposed on the outer surface of the first part to bond the adhesive, so that the adhesive can be firmly connected to the cover.

[0011] According to some embodiments of the present application, the battery cell has a first cover portion including a main cover portion and an extension portion. The extension portion extends from the main cover portion along the length direction of the cover body. A portion of the main cover portion covers the first portion, and another portion of the main cover portion covers the first folded portion. A portion of the extension portion covers the first portion, and another portion of the extension portion covers the first folded portion, so that the extension portion can cross the edge of the first folded portion, further reducing the possibility of the edge of the first folded portion lifting up.

[0012] According to some embodiments of this application, the battery cell has two extensions arranged opposite each other along the width direction of the cover. The two extensions are respectively arranged on both sides of the notch, so that the space formed by the notch can be concentrated between the two extensions. This is beneficial to the fact that the adhesive can be concentrated in the space formed by the notch instead of being scattered, which helps to improve the convenience of the adhesive installation.

[0013] According to some embodiments of the present application, the battery cell has an extension portion with a length of G in the length direction of the cover, where 1mm≤G≤10mm. This not only enables the extension portion to effectively cover the first fold portion and reduce the possibility of the first fold portion lifting, but also reduces material waste caused by the excessive size of the extension portion.

[0014] According to some embodiments of the present application, in the length direction of the cover, the end face of the extension away from the main cover is flush with the outer surface of the first main body, so that the extension can cover more of the edge of the pressed first fold, which helps to further reduce the possibility of the edge of the first fold on the first part lifting up.

[0015] According to some embodiments of the present application, the size of the first folded portion in the width direction of the cover is set to H, and the size of the extension portion is set to I, where I < H, 1.5mm ≤ H ≤ 4.5mm, and 2.5mm ≤ I ≤ 5.5mm. This makes the size of the extension portion in the width direction of the cover larger than the size of the first folded portion in the width direction of the cover. This ensures that the extension portion can not only cover and press the edge of the first folded portion located on the first portion, but also that the notch formed by the extension portion has sufficient space to accommodate the adhesive.

[0016] According to some embodiments of this application, the battery cell has a first folded portion forming a second opening, a main body portion covering the edge of the second opening, and a through hole communicating with the surface of the cover, the through hole serving as a notch. By using the through hole as a notch, an adhesive member can be placed in the through hole to bond external components such as pressure strips to the outer surface of the cover.

[0017] According to some embodiments of the present application, the end face of the main body is flush with the outer surface of the first main body in the width direction of the cover, so that the main body can cover a larger area of ​​the first folded portion, which is beneficial to improving the covering and pressing effect of the main body on the first folded portion and reducing the possibility of the first folded portion lifting up.

[0018] According to some embodiments of the battery cell provided in this application, the thickness of the second insulating member is greater than the thickness of the first insulating member. By setting the thickness of the second insulating member to be greater than the thickness of the first insulating member, the second insulating member has greater structural strength, and the second insulating member has a better covering effect on the first folded portion, which helps to further reduce the possibility of the first folded portion lifting.

[0019] According to some embodiments of the present application, the flame retardant rating of the second insulating member is higher than that of the first insulating member. Setting the flame retardant rating of the second insulating member covering the cover to be higher than that of the first insulating member can effectively reduce problems such as ignition caused by electrical sparks from the connection between the electrode terminals and external devices, which is beneficial to improving the reliability of the battery cell.

[0020] According to some embodiments of this application, the battery cell has an electrode terminal on the cover and an electrode lead-out hole on the second insulating member. The electrode terminal passes through the electrode lead-out hole, so that the electrode terminal can pass through the second insulating member and extend out, which facilitates the connection of the electrode terminal with external devices.

[0021] Secondly, some embodiments of this application also provide a battery device, which includes a housing, an adhesive element, a pressure strip, and a battery cell as provided in any of the above technical solutions. The pressure strip is housed in and connected to the housing, the battery cell is housed in the housing, and the pressure strip is bonded to the cover of the battery cell by the adhesive element.

[0022] Thirdly, some embodiments of this application also provide an electrical device, which includes the battery device provided by the above-described technical solution, and the battery device is used to provide electrical energy.

[0023] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0024] Some embodiments of this application provide a battery cell including an electrode assembly, a housing, a first insulating member, and a second insulating member. The housing includes a shell and a cover, the shell forming a first cavity with a first opening, and the cover closing onto the first opening. The electrode assembly is located in the first cavity. The first insulating member includes a first main body and a first folded portion. The first main body covers the outer peripheral surface of the shell, and the first folded portion is bent relative to the first main body and covers the outside of the cover. The second insulating member includes a main body and a connecting portion connected to each other. The connecting portion is located outside the shell and attached to the first main body. The main body is located outside the cover, with a portion covering the cover from the outside and another portion covering the first folded portion from the outside. The main body and the first folded portion form a notch or groove, or the main body forms a notch or groove, which communicates with the outer surface of the cover and is used to accommodate an adhesive component bonded to the cover. In the above structure, the main body of the second insulating member is located outside the cover, with a portion covering the cover and another portion covering the first folded portion, thus covering the first folded portion and making it less prone to lifting. Since the connecting part on the main body is attached to the first main body, it can provide additional connecting force for the second insulating member, so that the second insulating member can more firmly press the first folding part onto the outer surface of the cover, so that the first insulating member can stably play the role of insulation and isolation, reducing the possibility of short circuit between the outer shell and external devices, which is beneficial to improving the reliability of the battery cell.

[0025] 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

[0026] 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.

[0027] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0028] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application;

[0029] Figure 3 A split view of a battery cell provided in some embodiments of this application when the first and second insulating members are not covered;

[0030] Figure 4This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0031] Figure 5 Left view of the second insulating member in a battery cell provided in some embodiments of this application;

[0032] Figure 6 This is a schematic diagram of the structure of a battery cell when the second insulating component is separated, as provided in some embodiments of this application;

[0033] Figure 7 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0034] Figure 8 for Figure 7 A top view of the second insulating component;

[0035] Figure 9 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application.

[0036] In the attached diagram:

[0037] 1. Vehicle; 2. Battery unit; 3. Controller; 4. Motor; 5. Housing; 5a. First housing section; 5b. Second housing section; 5c. Receiving space; 7. Battery cell; 70. Electrode assembly; 71. Housing; 710. First cavity; 711. Shell; 7110. First opening; 712. Cover; 7121. First part; 7122. Second part; 7123. Third part;

[0038] 72. First insulating element; 721. First main body; 722. First folding part;

[0039] 73. Second insulating component; 731. Main body portion; 7311. First covering portion; 73110. Through hole; 73111. Main cover portion; 73112. Extension portion; 7312. Second covering portion; 7313. Third covering portion; 732. Connecting portion; 733. Electrode lead-out hole;

[0040] 74. Notch; 8. Pressure strip; X, width direction of the cover; Y, length direction of the cover. Detailed Implementation

[0041] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0042] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application 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 description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0043] In this application, the reference to "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 in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0044] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] 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, or B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0046] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0047] In the embodiments of this application, "parallel" includes not only the case of absolute parallelism, but also the case of approximate parallelism as commonly understood in engineering; similarly, "perpendicular" also includes not only the case of absolute perpendicularity, but also the case of approximate perpendicularity as commonly understood in engineering. For example, if the angle between two directions is 85°-90°, the two directions can be considered perpendicular; if the angle between two directions is 0°-5°, the two directions can be considered parallel.

[0048] In this application, "multiple" means two or more (including two).

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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. The electrolyte can be liquid, gel, or solid.

[0055] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0056] 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.

[0057] 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.

[0058] Gel electrolytes consist of a polymer-based electrolyte backbone network combined with an ionic liquid—lithium salt.

[0059] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0060] As an example, polymer solid electrolytes can be polyether (polyoxyethylene), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, monoionic polymers, polyionic liquids-lithium salts, cellulose, etc.

[0061] As an example, inorganic solid electrolytes can be one or more of the following: oxide solid electrolytes (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON thin film), sulfide solid electrolytes (crystalline lithium superconducting ion conductor (lithium germanium phosphorus sulfide, silver sulfide germanium ore), amorphous sulfides), halide solid electrolytes, nitride solid electrolytes, and hydride solid electrolytes.

[0062] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0063] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0064] 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.

[0065] 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.

[0066] 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.

[0067] 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.

[0068] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0069] 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.

[0070] 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.

[0071] 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.

[0072] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] Currently, to reduce the possibility of short circuits between the battery cell casing and external components, the battery cell casing typically needs to be covered with a film-like insulating material to achieve insulation isolation between the casing and external components. To allow external components such as pressure strips to adhere to the battery cell casing, the insulating material needs to have openings to accommodate the adhesive. In some cases, multiple insulating materials cover the casing surface to achieve insulation isolation between the casing and external components. An opening in one insulating material can expose the edge of another insulating material, making that edge prone to warping, reducing the insulation isolation effect, and negatively impacting the reliability of the battery cell. For example, an opening in the insulating material covering the top cover of the casing can expose the flange of insulating materials covering other parts of the casing on the top cover, making that flange prone to warping, reducing the insulation isolation effect, and negatively impacting the reliability of the battery cell.

[0078] To reduce the possibility of short circuits between the casing and external devices and improve the reliability of the battery cell, some embodiments of this application provide a battery cell including an electrode assembly, a casing, a first insulating member, and a second insulating member. The casing includes a housing and a cover, the housing forming a first cavity with a first opening, the cover closing the first opening, and the electrode assembly located in the first cavity. The first insulating member includes a first main body and a first folded portion, the first main body covering the outer peripheral surface of the housing, and the first folded portion bending relative to the first main body and covering the outside of the cover. The second insulating member includes a main body and a connecting portion connected to each other, the connecting portion being located outside the housing and attached to the first main body, the main body being located outside the cover, a portion of the main body covering the cover from the outside, and another portion of the main body covering the first folded portion from the outside, the main body and the first folded portion forming a notch or groove, or the main body forming a notch or groove, the notch or groove communicating with the outer surface of the cover, and the notch or groove being used to accommodate an adhesive member bonded to the cover. In the above structure, the main body of the second insulating member is located on the outside of the cover. A portion of the main body covers the cover, and another portion covers the first folded portion, thus covering the first folded portion and making it less prone to lifting. Because the connecting portion on the main body is attached to the first main body, it provides additional connecting force to the second insulating member, allowing it to more firmly press the first folded portion onto the outer surface of the cover. This enables the first insulating member to stably perform its insulating and isolating function, reducing the possibility of short circuits between the casing and external devices, and improving the reliability of the battery cell.

[0079] The battery cells described in this application are applicable to battery devices and electrical devices or energy storage devices that use battery devices.

[0080] 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.

[0081] 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.

[0082] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0083] 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.

[0084] 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.

[0085] 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.

[0086] Figure 2 This is a schematic diagram showing the disassembled structure of the battery device 2 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.

[0087] 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.

[0088] 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.

[0089] Assuming that the first box part 5a covers the top of the second box part 5b, the first box part 5a can also be called the upper box cover, and the second box part 5b can also be called the lower box 5.

[0090] Some embodiments of this application provide a battery cell 7, see reference Figure 3 and Figure 4 The battery cell 7 includes an electrode assembly 70, a housing 71, a first insulating member 72, and a second insulating member 73. The housing 71 includes a shell 711 and a cover 712. The shell 711 forms a first cavity 710 with a first opening 7110. The cover 712 covers the first opening 7110, and the electrode assembly 70 is located in the first cavity 710. The first insulating member 72 includes a first main body portion 721 and a first folded portion 722. The first main body portion 721 covers the outer peripheral surface of the shell 711, and the first folded portion 722 is bent relative to the first main body portion 721 and covers the outside of the cover 712. (Reference) Figure 5 The second insulating member 73 includes a main body portion 731 and a connecting portion 732 connected to each other. The connecting portion 732 is located on the outside of the housing 711 and attached to the first main body portion 721. The main body portion 731 is located on the outside of the cover 712. A portion of the main body portion 731 covers the cover 712 from the outside, and another portion of the main body portion 731 covers the first folded portion 722 from the outside. The main body portion 731 and the first folded portion 722 form a notch groove 74 or the main body portion 731 forms a notch groove 74. The notch groove 74 communicates with the outer surface of the cover 712 and is used to accommodate the adhesive attached to the cover 712.

[0091] Electrode assembly 70 is the component in the battery cell 7 where the electrochemical reaction occurs. The housing 71 may contain one or more electrode assemblies 70. Electrode assembly 70 may include an electrode body and tabs. The tabs extend from one end of the electrode body for electrical connection to electrode terminals to draw out the current from the electrode assembly 70. The electrode body may include a positive electrode, a negative electrode, and a separator. The positive and negative electrode can serve as the positive and negative electrodes, respectively. During the charging and discharging process of the battery cell 7, active ions (e.g., lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator is stacked between the positive and negative electrode to isolate them, preventing short circuits while allowing active ions to pass through.

[0092] The outer casing 71, as a component in the battery cell 7, forms a sealed space that accommodates other components in the battery cell 7, such as the electrolyte and electrode assembly 70. The outer casing 71 can have various shapes and sizes, such as cuboid or hexagonal prism. Specifically, the shape of the outer casing 71 can be determined based on the specific shape and size of the electrode assembly 70. The outer casing 71 can be made of various materials, such as copper, iron, aluminum, stainless steel, or aluminum alloy.

[0093] The housing 711 and the cover 712 are two interconnected parts of the outer casing 71. The housing 711 forms a first cavity 710 with a first opening 7110 at one end, allowing components such as the electrode assembly 70 to be easily inserted into the first cavity 710 through the first opening 7110. The cover 712 is a part used to seal the first opening 7110, and its seal fits onto the housing 711 to form a sealed space in the first cavity 710. The first cavity 710 formed by the housing 711 and the cover 712 is used to accommodate other components such as the electrode assembly 70 and the first insulating member 72 in the battery cell 7, and can protect these components.

[0094] The first insulating element 72 may be a partial film layer structure with insulating properties disposed on the surface of the outer casing 71 of the battery cell 7. It is used to insulate and isolate the outer casing 71 from external devices and adjacent battery cells 7, so that the battery cell 7 is less likely to short circuit with external devices and adjacent battery cells 7, which is beneficial to improving the reliability of the device.

[0095] The first main body portion 721 may be the main structure of the first insulating member 72. The first main body portion 721 covers the outer peripheral surface of the housing 711. It may be that the first main body portion 721 surrounds the outer peripheral surface of the housing 711 and is attached to the housing 711, so that the entire first main body portion 721 covers the outer peripheral surface of the housing 711. The first folded portion 722 may be the part of the first main body portion 721 that is connected to the first main body portion 721. It is bent relative to the first main body portion 721 and attached to the outer surface of the cover 712.

[0096] The second insulating member 73 can be an insulating film structure used to cover a portion of the outer surface of the cover 712. The second insulating member 73 can insulate the outer casing 71 from external devices and adjacent battery cells 7, making it less likely for the battery cells 7 to short-circuit with external devices and adjacent battery cells 7, thus improving the reliability of the device. The second insulating member 73 and the first insulating member 72 are interconnected, forming an insulating film structure covering the outer surface of the outer casing 71 to insulate the outer casing 71 from external devices and adjacent battery cells 7.

[0097] The main body 731 and the connecting part 732 are two interconnected parts of the second insulating member 73. The main body 731 is the main structure of the second insulating member 73, and it is disposed on the outside of the cover 712. A portion of the main body 731 covers the cover 712 from the outside, which means that a portion of the main body 731 is attached to the outer surface of the cover 712, so that the entire main body 731 can be firmly covered and connected to the outer surface of the cover 712. Another portion of the main body 731 covers the first folded part 722 from the outside, which means that another portion of the main body 731 is attached to the outer surface of the first folded part 722, covering and pressing the first folded part 722, so that the first folded part 722 is not prone to lifting.

[0098] The notch 74 can be a notch structure in the insulating film layer structure formed by the first insulating member 72 and the second insulating member 73 on the outer surface of the outer shell 71, which communicates with the outer surface of the cover 712. The notch 74 is used to accommodate adhesives that are bonded to the cover 712. This means that the adhesive is provided in the notch 74 that connects the outer surface of the cover 712 to the outside world. The adhesive can be bonded to the cover 712, so that external pressure strips 8, heat exchange components, and other devices can be bonded to the cover 712 through the adhesive, thus achieving a firm connection with the cover 712.

[0099] The main body portion 731 and the first folded portion 722 form a notch 74, which means that the main body portion 731 and the first folded portion 722 together surround the notch 74. For example, the main body portion 731 only covers a portion of the cover 712 exposed from the first folded portion 722, and the other portion of the cover 712 exposed from the first folded portion 722 is surrounded by the first folded portion 722 and the main body portion 731 to form the notch 74.

[0100] The main body 731 forms a notch 74, which may be formed by the main body 731 alone. For example, the main body 731 completely covers the cover 712 exposed from the first folding portion 722, but a notch structure is formed on the main body 731 to expose the outer surface of the cover 712, and this notch structure forms the notch 74.

[0101] In the above structure, the main body 731 of the second insulating member 73 is located on the outside of the cover 712. A part of the main body 731 covers the cover 712, and another part covers the first folded portion 722, thus covering the first folded portion 722 and making it less likely for the first folded portion 722 to lift up. Since the connecting portion 732 connected to the main body 731 is attached to the first main body 721, it can provide additional connecting force for the second insulating member 73, so that the second insulating member 73 can more firmly press the first folded portion 722 onto the outer surface of the cover 712. This allows the first insulating member 72 to stably play an insulating and isolating role, reducing the possibility of short circuit between the outer casing 71 and external devices, and improving the reliability of the battery cell 7.

[0102] In some embodiments, continue to refer to Figure 3 The cover 712 includes a first part 7121, a second part 7122, and a third part 7123. The second part 7122 is closer to the electrode assembly 70 than the first part 7121. The third part 7123 is bent towards the first part 7121 relative to the second part 7122. The third part 7123 connects the first part 7121 and the second part 7122. In the length direction Y of the cover, the first part 7121, the third part 7123, and the second part 7122 are arranged sequentially. (Continue referring to...) Figure 4 The main body 731 includes a first covering part 7311, a second covering part 7312 and a third covering part 7313. The third covering part 7313 is connected between the first covering part 7311 and the second covering part 7312. The first covering part 7311 is located outside the first part 7121, the second covering part 7312 is located outside the second part 7122, and the third covering part 7313 is located outside the third part 7123. The connecting part 732 is connected to the third covering part 7313.

[0103] The first part 7121, the second part 7122, and the third part 7123 can be different parts of the cover 712. The first part 7121, the third part 7123, and the second part 7122 are arranged sequentially along the length Y direction of the cover. The third part 7123 is connected between the first part 7121 and the second part 7122, so that the first part 7121, the second part 7122, and the third part 7123 are connected to form an integral structure.

[0104] For example, the first part 7121, the second part 7122 and the third part 7123 can be integrally formed by stamping process, which not only gives the cover 712 good structural strength, but also helps to improve the processing strength of the cover 712 and reduce processing costs.

[0105] The second part 7122 is closer to the electrode assembly 70 than the first part 7121, so that the second part 7122 is closer to the electrode assembly 70 than the first part 7121. For example, by bending the third part 7123 relative to the first part 7121 towards the electrode assembly 70, the second part 7122 is made even closer to the electrode assembly 70 than the first part 7121, thus forming a recess on the outer surface of the cover 712.

[0106] The first covering portion 7311, the second covering portion 7312, and the third covering portion 7313 can be different parts of the main body portion 731. The third covering portion 7313 is connected between the first covering portion 7311 and the second covering portion 7312, so that the first covering portion 7311, the second covering portion 7312, and the third covering portion 7313 are connected to form the main body portion 731 with an integral structure.

[0107] By providing the first covering portion 7311 on the outside of the first portion 7121, the first covering portion 7311 covers the cover body 712 from the outside of the first portion 7121. By providing the second covering portion 7312 on the outside of the second portion 7122, the second covering portion 7312 covers the cover body 712 from the outside of the second portion 7122. By providing the third covering portion 7313 on the outside of the third portion 7123, the third covering portion 7313 covers the cover body 712 from the outside of the third portion 7123.

[0108] Because the third part 7123 is bent relative to the first part 7121 toward the electrode assembly 70, it has a bent structure. The first folded portion 722 covering the cover 7122 is more prone to lifting on the third part 7123. The third covering portion 7313, which covers the first folded portion 722 on the third part 7123, experiences a greater lifting force, making it easier to detach from the first folded portion 722. By connecting the connecting portion 732 to the third covering portion 7313, the third covering portion 7313 can better receive the additional connecting force provided by the connecting portion 732. This allows the third covering portion 7313 to more firmly press the first folded portion 722 onto the outer surface of the third part 7123, improving the effect of reducing the lifting of the first folded portion 722.

[0109] In some embodiments, the area of ​​the connecting portion 732 is set to D = 25 mm. 2 ≤D≤100mm 2 .

[0110] By setting the area D of the connecting part 732 to 25mm 2 ≤D≤100mm 2 This not only ensures that the connecting part 732 has sufficient area to provide sufficient connecting force to apply pressure to the main body 731, enabling the main body 731 to effectively press the first folding part 722, but also prevents the connecting part 732 from wasting materials due to excessive area and affecting the arrangement of other surrounding components.

[0111] The area D of the connecting part 732 can be set to 40mm. 2 ≤D≤80mm 2 For example, the area D of the connecting portion 732 can be set to 40 mm. 2 50mm 2 60mm 2 70mm 2 Or 80mm 2 This ensures that the connecting part 732 has sufficient area to allow the main body part 731 to effectively press down on the first folding part 722, while also preventing material waste due to excessive area.

[0112] In some embodiments, the size of the first covering portion 7311 is set to E in the length direction Y of the cover, and the size of the first portion 7121 is set to F, where 0.3≤E / F≤0.7.

[0113] By setting the dimension of the first covering portion 7311 in the length direction Y of the cover body to E, and setting the dimension of the first portion 7121 in the length direction Y of the cover body to F, and setting the relationship between the two to 0.3≤E / F≤0.7, the first covering portion 7311 can cover a suitable area of ​​the first portion 7121. This not only allows the first covering portion 7311 to cover enough area of ​​the first portion 7121 to cover and press the first folded portion 722 on the first portion 7121, reducing the possibility of the first folded portion 722 lifting up, but also allows enough area to be exposed on the outer surface of the first portion 7121 for bonding the adhesive, so that the adhesive can be firmly connected to the cover body 712.

[0114] The relationship between the dimension E of the first covering portion 7311 in the length direction Y of the cover and the dimension F of the first portion 7121 in the length direction Y of the cover can be set to 0.4 ≤ E / F ≤ 0.6. For example, the relationship between the dimension E of the first covering portion 7311 in the length direction Y of the cover and the dimension F of the first portion 7121 in the length direction Y of the cover can be set to E / F = 0.4, E / F = 0.5, or E / F = 0.6, such that while the first covering portion 7311 covers a sufficient area of ​​the first portion 7121 to cover and press the first folded portion 722 on the first portion 7121, it also exposes a sufficient area on the outer surface of the first portion 7121 for bonding the adhesive component.

[0115] In some embodiments, the size of the first covering portion 7311 in the longitudinal direction Y of the cover is set to E, where 5mm≤E≤12mm.

[0116] By setting the dimension E of the first covering portion 7311 in the length direction Y of the cover body to a range of 5mm≤E≤12mm, the first covering portion 7311 can cover a suitable area of ​​the first portion 7121. This not only allows the first covering portion 7311 to cover enough area of ​​the first portion 7121 to cover and press the first folded portion 722 on the first portion 7121, reducing the possibility of the first folded portion 722 lifting up, but also allows enough area to be exposed on the outer surface of the first portion 7121 for bonding the adhesive, so that the adhesive can be firmly connected to the cover body 712.

[0117] The dimension E of the first covering portion 7311 in the length direction Y of the cover can be set to 7mm≤E≤10mm. For example, the dimension E of the first covering portion 7311 in the length direction Y of the cover can be set to 7mm, 8mm or 10mm, so that while the first covering portion 7311 covers a sufficient area of ​​the first portion 7121 to cover and press the first folded portion 722 on the first portion 7121, it can also expose a sufficient area on the outer surface of the first portion 7121 to bond the adhesive.

[0118] In one embodiment, reference Figure 6 and Figure 7 The first cover portion 7311 includes a main cover portion 73111 and an extension portion 73112. The extension portion 73112 extends from the main cover portion 73111 along the length direction Y of the cover body. A portion of the main cover portion 73111 covers the first portion 7121, and another portion of the main cover portion 73111 covers the first folding portion 722. A portion of the extension portion 73112 covers the first portion 7121, and another portion of the extension portion 73112 covers the first folding portion 722.

[0119] The main cover portion 73111 and the extension portion 73112 are two parts of the first cover portion 7311. The extension portion 73112 extends from the end of the main cover portion 73111 in the length direction Y of the cover body. By covering the first portion 7121 with a portion of the main cover portion 73111 and the first folded portion 722 with another portion of the main cover portion 73111, the main cover portion 73111 can cross the edge of the first folded portion 722, reducing the possibility of the edge of the first folded portion 722 curling up. By covering the first portion 7121 with a portion of the extension portion 73112 and the first folded portion 722 with another portion of the extension portion 73112, the extension portion 73112 can cross the edge of the first folded portion 722, further reducing the possibility of the edge of the first folded portion 722 curling up.

[0120] By extending the main cover portion 73111 into the end of the cover body in the length direction Y by the extension portion 73112, the extension portion 73112 can additionally cover the edge of the first fold portion 722, thereby improving the covering effect of the first cover portion 7311 on the first fold portion 722 on the first portion 7121.

[0121] In some embodiments, two extensions 73112 are provided opposite to each other along the width direction X of the cover, and the two extensions 73112 are respectively provided on both sides of the notch 74.

[0122] By providing two extensions 73112 opposite to each other in the width direction X of the cover, the notch 74 can be located between the two extensions 73112, and the space formed by the notch 74 can be concentrated between the two extensions 73112. This makes it easier to concentrate the adhesive in the space formed by the notch 74 instead of dispersing it, thus improving the convenience of adhesive installation.

[0123] In some embodiments, reference Figure 8 In the length direction Y of the cover, the dimension of the extension 73112 is set to G, where 1mm≤G≤10mm.

[0124] By setting the dimension G of the extension 73112 in the length direction Y of the cover to a range of 1mm≤G≤10mm, the extension 73112 can effectively cover the first folding part 722, reducing the possibility of the first folding part 722 lifting up, and also reducing material waste caused by the excessive size of the extension 73112.

[0125] The dimension G of the extension 73112 in the length direction Y of the cover can be set to 2mm≤G≤5mm. For example, the dimension G of the extension 73112 in the length direction Y of the cover can be set to 2mm, 3mm, 4mm or 5mm, so that the first covering part 7311 can effectively cover and press the first folding part 722 on the first part 7121 while reducing material waste.

[0126] In some embodiments, in the longitudinal direction Y of the cover, the end face of the extension 73112 away from the main cover 73111 is flush with the outer surface of the first main body 721.

[0127] The end face of the extension 73112 away from the main cover 73111 in the length direction Y of the cover is flush with the outer surface of the first main body 721. This means that the extension 73112 extends from the main cover 73111 along the length direction Y of the cover until it is flush with the outer surface of the first main body 721, so that the extension 73112 can cover more of the edge of the pressed first folded part 722, which helps to further reduce the possibility of the edge of the first folded part 722 on the first part 7121 lifting up.

[0128] In some embodiments, in the width direction X of the cover, the size of the first folding portion 722 is set to H, and the size of the extension portion 73112 is set to I, where I < H, 1.5mm ≤ H ≤ 4.5mm, and 2.5mm ≤ I ≤ 5.5mm.

[0129] By setting the dimension of the first folding portion 722 in the width direction X of the cover to H, and setting the dimension of the extension portion 73112 in the width direction X of the cover to I, where I < H, the extension portion 73112 can partially cover the first folding portion 722 and partially cover the surface of the first portion 7121, so that the edge of the first folding portion 722 located on the first portion 7121 can be covered and pressed by the extension portion 73112.

[0130] By setting the dimension H of the first folded portion 722 in the width direction X of the cover to a range of 1.5mm ≤ H ≤ 4.5mm, not only can the first folded portion 722 provide sufficient connecting force to attach to the cover 712, but it is also less likely to waste material due to excessive size. By setting the dimension I of the extension portion 73112 in the width direction X of the cover to a range of 2.5mm ≤ I ≤ 5.5mm, the dimension of the extension portion 73112 in the width direction X of the cover is greater than the dimension of the first folded portion 722 in the width direction X of the cover. This allows the extension portion 73112 to not only cover and press the edge of the first folded portion 722 located on the first portion 7121, but also ensures that the notch 74 formed by the extension portion 73112 has sufficient space to accommodate the adhesive.

[0131] In some embodiments, the first folding portion 722 forms a second opening, and the main body portion 731 covers the edge of the second opening, reference Figure 9 The main body 731 is provided with a through hole 73110 that communicates with the surface of the cover 712, and the through hole 73110 serves as a notch 74.

[0132] The first folding portion 722 has a second opening, which means that the first folding portion 722 forms a second opening without insulating material. The second opening may be an opening that is provided along the thickness direction of the cover 712.

[0133] The main body 731 covers the edge of the second opening, which means that the main body 731 covers the entire edge of the second opening, effectively reducing the possibility that the first folded part 722 may curl up from the second opening.

[0134] The through hole 73110 can refer to a hole-like structure provided on the main body 731, which penetrates the main body 731 along its thickness direction, allowing the through hole 73110 to connect the surface of the cover 712 with the outside. By using the through hole 73110 as a notch 74, an adhesive can be placed in the through hole 73110 to bond external components such as the pressure strip 8 to the outer surface of the cover 712.

[0135] For example, a through hole 73110 is provided on the first cover portion 7311 and communicates with the surface of the first portion 7121, so that the adhesive can bond external devices such as pressure strips 8 to the surface of the first portion 7121.

[0136] In some embodiments, in the width direction X of the cover, the end face of the main body portion 731 is flush with the outer surface of the first main body portion 721.

[0137] By aligning the end face of the main body 731 in the width direction X of the cover with the outer surface of the first main body 721, the main body 731 can cover a larger area of ​​the first folded portion 722, which helps to improve the covering and pressing effect of the main body 731 on the first folded portion 722 and reduces the possibility of the first folded portion 722 lifting up.

[0138] In some embodiments, the thickness of the second insulating member 73 is greater than the thickness of the first insulating member 72.

[0139] By setting the thickness of the second insulating member 73 to be greater than that of the first insulating member 72, the second insulating member 73 has greater structural strength, which makes the second insulating member 73 have a better covering effect on the first folded part 722, and helps to further reduce the possibility of the first folded part 722 lifting up.

[0140] In some embodiments, the flame retardant rating of the second insulating member 73 is higher than that of the first insulating member 72.

[0141] By setting the flame retardant rating of the second insulating component 73 to be higher than that of the first insulating component 72, the second insulating component 73 achieves better flame retardant performance. Since the electrode terminals used for connecting to external devices are typically located on the cover 712, setting the flame retardant rating of the second insulating component 73 covering the cover 712 to be higher than that of the first insulating component 72 effectively reduces problems such as ignition caused by electrical sparks during the connection between the electrode terminals and external devices, thus improving the reliability of the battery cell 7.

[0142] For example, the flame retardant rating of the second insulating component 73 and the flame retardant rating of the first insulating component 72 can be obtained by measuring according to the national standard GB / T 2408. The specific measurement method can be referred to the national standard GB / T 2408, and will not be elaborated here.

[0143] In some embodiments, the cover 712 is provided with electrode terminals, and the second insulating member 73 is provided with electrode lead-out holes 733, through which the electrode terminals pass.

[0144] The electrode terminals can be structures for connecting the battery cell 7 to an external electrical device or a charging device, so that the battery cell 7 can provide electrical energy to the external electrical device or the charging device can charge the battery cell 7.

[0145] The electrode terminal is disposed on the cover 712. This can be either a single electrode terminal on the cover 712 or two electrode terminals with opposite polarities spaced apart on the cover 712. The electrode terminal is electrically connected to the tab. This connection can be direct or indirect via a current collector.

[0146] The electrode lead-out hole 733 can be a hole-like structure provided on the second insulating member 73, which penetrates the second insulating member 73 along the thickness direction of the second insulating member 73, and is used to allow the electrode terminal provided on the cover 712 to extend out.

[0147] By allowing the electrode terminals to pass through the electrode lead-out hole 733 of the second insulating member 73, the electrode terminals can extend through the second insulating member 73, facilitating the connection of the electrode terminals with external devices.

[0148] In some embodiments, the cover 712 is provided with a pressure relief mechanism, and the second insulating member 73 is provided with a pressure relief outlet hole, which is connected to the pressure relief mechanism.

[0149] The pressure relief mechanism is used to release the internal gas of the battery cell 7. It is actuated to release the internal pressure or temperature when the internal pressure or temperature of the battery cell 7 reaches a predetermined threshold. When the internal pressure or temperature of the battery cell 7 reaches the predetermined threshold, the pressure relief mechanism is activated or a weak structure in the pressure relief mechanism is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0150] The pressure relief outlet hole extends through the second insulating member 73 along the thickness direction and is connected to the pressure relief mechanism, so that the substance discharged from the pressure relief mechanism can be discharged from the pressure relief outlet hole.

[0151] Some embodiments of this application also provide a battery device 2. Referring again to the figures, the battery device 2 includes a housing 5, an adhesive member, a pressure strip 8, and a battery cell 7 provided by any of the above technical solutions. The pressure strip 8 is housed in and connected to the housing 5. The battery cell 7 is housed in the housing 5. The pressure strip 8 is bonded to the cover 712 of the battery cell 7 by the adhesive member.

[0152] The housing 5 can be a component in the battery assembly 2 used to house the pressure strip 8, battery cells 7, and other components, forming a receiving space 5c to accommodate the pressure strip 8, battery cells 7, and other components. The pressure strip 8 can be a component used to fix the battery cells 7, helping to maintain the structural stability of the overall structure formed by the battery cells 7. The adhesive component can be a part used to firmly connect the pressure strip 8 to the outer casing 71 of the battery cells 7. The pressure strip 8 is bonded to the cover 712 of the battery cells 7 through the adhesive component, so that the pressure strip 8 can be firmly connected to the outer surface of the cover 712.

[0153] For example, the adhesive may be formed by curing adhesive filling the notch 74, so that the adhesive can be firmly bonded to the outer surface of the cover 712 and the pressure strip 8.

[0154] 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.

[0155] Some embodiments of this application provide a battery cell 7, which includes an electrode assembly 70, a housing 71, a first insulating member 72, and a second insulating member 73. A cover 712 covers a first opening 7110 formed in the housing 711. A second portion 7122 in the cover 712 is closer to the electrode assembly 70 than the first portion 7121. A third portion 7123 connects the first portion 7121 and the second portion 7122. In the first insulating member 72, a first main body portion 721 covers the outer peripheral surface of the housing 711, and a first folded portion 722 is bent relative to the first main body portion 721 and covers the outside of the cover 712. The second insulating member 73 includes a main body portion 731 and a connecting portion 732 connected to each other. The first covering portion 7311, the second covering portion 7312, and the third covering portion 7313 are located outside the first portion 7121, the second portion 7122, and the third portion 7123 respectively, and cover the first folding portion 722. The connecting portion 732 is connected to the third covering portion 7313. The first covering portion 7311 includes a main cover portion 73111 and an extension portion 73112. The extension portion 73112 extends from the main cover portion 73111 along the length direction Y of the cover body. A portion of the main cover portion 73111 covers the first portion 7121, and another portion of the main cover portion 73111 covers the first folding portion 722. A portion of the extension portion 73112 covers the first portion 7121, and another portion of the extension portion 73112 covers the first folding portion 722.

[0156] In the above structure, the main body 731 of the second insulating member 73 is located on the outside of the cover 712. A part of the main body 731 covers the cover 712, and another part covers the first folded portion 722, thus covering the first folded portion 722 and making it less likely for the first folded portion 722 to lift up. Since the connecting portion 732 connected to the main body 731 is attached to the first main body 721, it can provide additional connecting force for the second insulating member 73, so that the second insulating member 73 can more firmly press the first folded portion 722 onto the outer surface of the cover 712. This allows the first insulating member 72 to stably play an insulating and isolating role, reducing the possibility of short circuit between the outer casing 71 and external devices, and improving the reliability of the battery cell 7.

[0157] 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 first cavity with a first opening, the cover closing the first opening, and the electrode assembly located in the first cavity; The first insulating element includes a first main body and a first folded portion, the first main body covering the outer peripheral surface of the housing, and the first folded portion bending relative to the first main body and covering the outside of the cover; The second insulating element includes a main body and a connecting part that are connected to each other. The connecting part is located on the outside of the housing and attached to the first main body. The main body is located on the outside of the cover. A portion of the main body covers the cover from the outside, and another portion of the main body covers the first folded part from the outside. The main body and the first folded part form a notch or groove, or the main body forms the notch or groove. The notch or groove communicates with the outer surface of the cover. The notch or groove is used to accommodate an adhesive that is bonded to the cover.

2. The battery cell according to claim 1, characterized in that, The cover includes a first part, a second part, and a third part. The second part is closer to the electrode assembly than the first part. The third part is bent toward the electrode assembly relative to the first part. The third part is connected between the first part and the second part. The first part, the third part, and the second part are arranged sequentially along the length of the cover. The main body includes a first covering part, a second covering part, and a third covering part. The third covering part is connected between the first covering part and the second covering part. The first covering part is located outside the first part, the second covering part is located outside the second part, and the third covering part is located outside the third part. The connecting part is connected to the third covering part.

3. The battery cell according to claim 1 or 2, characterized in that, The area of ​​the connecting part is set to D, 25mm. 2 ≤D≤100mm 2 .

4. The battery cell according to claim 2, characterized in that, In the length direction of the cover, the size of the first covering part is set to E, the size of the first part is set to F, and 0.3≤E / F≤0.

7.

5. The battery cell according to claim 2 or 4, characterized in that, In the length direction of the cover, the size of the first covering part is set to E, 5mm≤E≤12mm.

6. The battery cell according to any one of claims 2, 4 or 5, characterized in that, The first covering portion includes a main cover portion and an extension portion. The extension portion extends from the main cover portion along the length direction of the cover body. A portion of the main cover portion covers the first portion, and another portion of the main cover portion covers the first folding portion. A portion of the extension portion covers the first portion, and another portion of the extension portion covers the first folding portion.

7. The battery cell according to claim 6, characterized in that, Two extensions are provided opposite each other along the width direction of the cover, and the two extensions are respectively provided on both sides of the notch.

8. The battery cell according to claim 6 or 7, characterized in that, In the length direction of the cover, the dimension of the extension is set to G, where 1mm≤G≤10mm.

9. The battery cell according to claim 6 or 7, characterized in that, Along the length of the cover, the end face of the extension away from the main cover is flush with the outer surface of the first main body.

10. The battery cell according to any one of claims 6 to 9, characterized in that, In the width direction of the cover, the size of the first folding part is set to H, and the size of the extension part is set to I, where I < H, 1.5mm ≤ H ≤ 4.5mm, and 2.5mm ≤ I ≤ 5.5mm.

11. The battery cell according to any one of claims 1 to 5, characterized in that, The first folding portion has a second opening, the main body portion covers the edge of the second opening, and the main body portion has a through hole communicating with the surface of the cover, the through hole serving as the notch groove.

12. The battery cell according to any one of claims 1 to 11, characterized in that, In the width direction of the cover, the end face of the main body is flush with the outer surface of the first main body.

13. The battery cell according to any one of claims 1 to 12, characterized in that, The thickness of the second insulating element is greater than the thickness of the first insulating element.

14. The battery cell according to any one of claims 1 to 12, characterized in that, The flame retardant rating of the second insulating component is higher than that of the first insulating component.

15. The battery cell according to any one of claims 1 to 12, characterized in that, The cover is provided with electrode terminals, and the second insulating member is provided with electrode lead-out holes, through which the electrode terminals pass.

16. A battery device, characterized in that, The device includes a housing, an adhesive element, a pressure strip, and a battery cell as described in any one of claims 1 to 15, wherein the pressure strip is housed in and connected to the housing, the battery cell is housed in the housing, and the pressure strip is bonded to the cover of the battery cell via the adhesive element.

17. An electrical device, characterized in that, Includes the battery device as described in claim 16, the battery device being used to provide electrical energy.

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