Battery cell, battery device, and electric device

Abstract

Some embodiments of this application provide a battery cell, a battery device, and an electrical device. The battery cell has a first shell wall connected to the outer periphery of a second shell wall and surrounding an electrode assembly. At least a portion of a first insulating member surrounds and is connected to the first shell wall, and the first insulating member has a first opening. At least a portion of a second insulating member covers the second shell wall from the outside, and the second insulating member is connected to the first insulating member and covers the edge of the first opening. The second insulating member has a through hole for accommodating an adhesive member bonded to the second shell wall. Because the second insulating member, which covers the second shell wall from the outside, is connected to the first insulating member and covers the edge of the first opening formed by the first insulating member from the outside, the edge portion of the first opening of the first insulating member is less prone to warping. This allows 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.

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, electrode terminals, a first insulating member, and a second insulating member. The electrode assembly includes tabs and is housed in the housing. The housing includes a first housing wall and a second housing wall. The first housing wall is connected to the outer periphery of the second housing wall and surrounds the electrode assembly. The electrode terminals are disposed on the second housing wall and electrically connected to the tabs. At least a portion of the first insulating member surrounds the first housing wall and is connected to the first housing wall. The first insulating member has a first opening. At least a portion of the second insulating member covers the second housing wall from the outside. The second insulating member is connected to the first insulating member and covers the edge of the first opening. The second insulating member has a through hole for accommodating an adhesive member adhered to the second housing wall. In the above structure, since the second insulating member, which covers the second shell wall from the outside, connects to the first insulating member and covers the edge of the first opening formed by the first insulating member from the outside, the edge of the first opening of the first insulating member is less likely to lift up. This allows the first insulating member to be more firmly and reliably connected to the first shell wall, enabling the first insulating member to stably play an insulating and isolating role, reducing the possibility of short circuit between the shell and external devices, and improving the reliability of the battery cell.

[0006] According to some embodiments of the present application, the battery cell includes a first insulating member comprising a first main body portion and a first folded portion connected to each other. The first main body portion covers a first shell wall, and the first folded portion is bent relative to the first main body portion and covers a second shell wall. The first folded portion forms a first opening, and a portion of the second insulating member and at least a portion of the first folded portion are stacked along the thickness direction of the second insulating member to cover the edge of the first opening.

[0007] According to some embodiments of the present application, the shortest distance between the edge of the first opening and the outer surface of the first shell wall is D, where D≥2mm. This not only ensures that the first folded portion has sufficient coverage area on the second shell wall, which is beneficial to increasing the creepage distance between the second shell wall and external devices, and enabling the first insulating member to better perform its insulating and isolating function, but also ensures that the first folded portion forming the first opening has sufficient size for easy processing.

[0008] According to some embodiments of this application, the battery cell includes a second insulating member comprising a second main body portion and a second folded portion connected to each other. The second folded portion is bent relative to the second main body portion and stacked with the first main body portion along the thickness direction of the first main body portion. A portion of the second main body portion covers the second shell wall, and a portion of the second main body portion is stacked with the first folded portion along the thickness direction of the second main body portion to cover the edge of the first opening.

[0009] According to some embodiments of the present application, the shortest distance between the through hole and the outer surface of the first shell wall is L, and the shortest distance between the edge of the first opening and the outer surface of the first shell wall is D, where 2mm≤L≤D+5mm. This not only ensures that the material between the through hole and the edge of the second insulating member has sufficient width and good strength, but also provides a large coverage area for the edge of the first opening formed by the first insulating member, making the first insulating member less prone to lifting or falling off. At the same time, it also allows the through hole to have a large cross-sectional area to accommodate the adhesive.

[0010] According to some embodiments of this application, a battery cell has a first opening formed on the outer side of the first housing wall. A second insulating member includes a second main body portion and a second folded portion connected to each other. The second main body portion covers the second housing wall, and the second folded portion is bent relative to the second main body portion. Along the thickness direction of the first insulating member, the second folded portion is stacked with at least a portion of the first insulating member, and the first insulating member stacked with the second folded portion forms the first opening. By having the second folded portion cover the portion of the first insulating member forming the first opening, the edge of the first opening is covered by the second folded portion, making it less prone to lifting at the edge of the first opening, and allowing the first insulating member to be more firmly and reliably connected to the first housing wall.

[0011] According to some embodiments of the present application, the battery cell has a second insulating member with a bending mark, which is located at the connection between the second main body and the second folded portion. By providing the bending mark at the connection between the second main body and the second folded portion, an operator can bend the second insulating member along the bending mark when attaching it to the housing, so that the second main body covers the second housing wall, and the second folded portion covers the outer surface of the first main body attached to the outside of the first housing wall.

[0012] According to some embodiments of the present application, the battery cell has a second insulating member with a thinning structure located at the connection between the second main body and the second folded portion. The thickness of the thinning structure is less than the thickness of the second main body and less than the thickness of the second folded portion. The thinning structure forms a bending mark. By forming a bending mark on the thinning structure, when the operator bends the second insulating member along the bending mark, it is easier to bend the second folded portion relative to the second main body, making it easier to attach the second insulating member to the surface of the outer casing.

[0013] According to some embodiments of the present application, the battery cell has a second insulating member with multiple marking holes, which are spaced apart at the connection between the second main body and the second folded portion to form bending marks. By spaced apart at the connection between the second main body and the second folded portion, the multiple marking holes can reduce the rigidity of the connection between the second main body and the second folded portion, so that the multiple marking holes not only serve as bending marks, but also allow the operator to more easily bend the second insulating member at the locations of the multiple marking holes.

[0014] According to some embodiments of the present application, the battery cell has a first shell wall forming a second opening, and a second shell wall covering the second opening. The length of the second folded portion along the orientation of the second opening is H, where H ≥ 2 mm. By setting the length H of the second folded portion along the orientation of the second opening to H ≥ 2 mm, not only is the second folded portion sufficiently sized for processing and forming, but it also provides sufficient area on the outer side of the first shell wall to cover the first insulating member. This increases the stacking area between the second and first insulating members, improving the connection strength between them.

[0015] According to some embodiments of the present application, the battery cell provided has a second folded portion disposed through the outer side of the first shell wall along the orientation of the second opening. This not only allows the second folded portion and the first insulating member to have a large coverage area, thereby improving the connection strength between the second insulating member and the first insulating member, but also allows the stacking of the second folded portion and the first insulating member to improve the insulation and isolation effect on the shell.

[0016] According to some embodiments of the present application, the battery cell has a first shell wall including two first walls disposed opposite to each other along a second direction and two second walls disposed opposite to each other along a third direction. The first walls are connected between the two second walls. The second direction, the third direction and the first direction are perpendicular to each other. At least one of the first walls and the second walls has a second folded portion on its outer side.

[0017] According to some embodiments of the present application, the area of ​​the first wall is smaller than the area of ​​the second wall, and a second folded portion is provided on the outer side of both first walls. By providing a second folded portion on the outer side of both first walls, the second folded portion is located on the smaller outer surface of the first shell wall. This not only enhances the connection strength between the second insulator and the first insulator, but also prevents material waste due to an excessively large area of ​​the second folded portion.

[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 that 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 insulating member, which helps to further reduce the possibility of the first insulating member lifting or falling off.

[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. Since the electrode terminals for connecting to external devices are disposed on the second shell wall, setting the flame retardant rating of the second insulating member covering the second shell wall 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 the present application, the battery cell has an electrode lead-out hole in the second insulating member, through which the electrode terminal passes. By allowing the electrode terminal to pass through the electrode lead-out hole in the second insulating member, the electrode terminal can protrude through the second insulating member, facilitating connection between the electrode terminal and external devices.

[0021] Secondly, some embodiments of this application also provide a battery device, which includes a housing, an adhesive member, a pressure strip, and a battery cell provided by any of the above technical solutions. The pressure strip is housed in and connected to the housing, and the battery cell is housed in the housing. The pressure strip is bonded to the second shell wall of the battery cell through the adhesive member, which helps to maintain the structural stability of the overall structure formed by the battery cell.

[0022] According to some embodiments of the present application, the battery device is provided with multiple battery cells, and a portion of the second insulating member of the battery cell is located between the outer shells of two adjacent battery cells. The second insulating members of two adjacent battery cells abut against each other, so that the second insulating member can play a buffering role between the outer shells of two adjacent battery cells.

[0023] According to some embodiments of the present application, a battery device is provided in which a receiving gap is formed between two adjacent battery cells. The receiving gap and a second insulating member located between two adjacent housings are arranged along the orientation of a first opening in the battery cell. The battery device also includes a buffer member located in the receiving gap and abutting against the two adjacent housings. By placing the buffer member in the receiving gap and abutting against the two adjacent housings, both the buffer member and the second insulating member located between the two adjacent housings are clamped by the two adjacent housings, thereby buffering or absorbing the volume expansion of the battery cells.

[0024] 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.

[0025] The technical solutions provided by the embodiments of this disclosure bring at least the following beneficial effects:

[0026] Some embodiments of this application provide a battery cell including an electrode assembly, a housing, electrode terminals, a first insulating member, and a second insulating member. The electrode assembly includes tabs and is housed within the housing. The housing includes a first housing wall and a second housing wall. The first housing wall is connected to the outer periphery of the second housing wall and surrounds the electrode assembly. The electrode terminals are disposed on the second housing wall and electrically connected to the tabs. At least a portion of the first insulating member surrounds and is connected to the first housing wall, and the first insulating member has a first opening. At least a portion of the second insulating member covers the second housing wall from the outside. The second insulating member is connected to the first insulating member and covers the edge of the first opening. The second insulating member has a through hole for accommodating an adhesive member bonded to the second housing wall. In the above structure, because the second insulating member, which covers the second housing wall from the outside, is connected to the first insulating member and covers the edge of the first opening formed by the first insulating member from the outside, the edge of the first opening of the first insulating member is less prone to warping. This allows the first insulating member to be more firmly and reliably connected to the first housing wall, enabling it to stably provide insulation and isolation, reducing the possibility of short circuits between the housing and external devices, and improving the reliability of the battery cell.

[0027] 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

[0028] 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.

[0029] Figure 1 These are schematic diagrams of the vehicle structure provided in some embodiments of this application;

[0030] Figure 2 This is a schematic diagram showing the disassembled structure of a battery device provided in some embodiments of this application;

[0031] Figure 3 This is a schematic diagram of the structure of a battery cell without the second insulating member provided in some embodiments of this application;

[0032] Figure 4 This is a schematic diagram of the structure of a battery cell covered with a second insulating member according to some embodiments of this application;

[0033] Figure 5 This is a schematic diagram of the structure of the second insulating element in a battery cell provided in some embodiments of this application;

[0034] Figure 6 This is a schematic diagram of the structure of a battery cell without the second insulating member provided in some embodiments of this application;

[0035] Figure 7 A schematic diagram of the structure of a battery cell without the second insulating member, provided for some embodiments of this application;

[0036] Figure 8 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0037] Figure 9 This is a schematic diagram of the structure of the second insulating element in a battery cell provided in other embodiments of this application;

[0038] Figure 10 This is a schematic diagram of the structure of the second insulating element in a battery cell provided in some embodiments of this application;

[0039] Figure 11 This is a schematic diagram of the structure of a battery cell provided in some other embodiments of this application;

[0040] Figure 12 This is a schematic diagram of the structure of a battery cell provided in some embodiments of this application;

[0041] Figure 13 This is a schematic diagram showing the split structure of a battery cell without the first and second insulating members covered, provided in some embodiments of this application.

[0042] Figure 14 This is a schematic diagram showing the arrangement of two adjacent battery cells according to some embodiments of this application;

[0043] Figure 15for Figure 14 Enlarged view of point F in the middle.

[0044] In the attached diagram:

[0045] 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; 70. Electrode assembly; 71. Housing; 711. First housing wall; 7111. First wall; 7112. Second wall; 712. Second housing wall; 72. Electrode terminal; 73. First insulating element; 730. First opening; 731. First main body section; 732. First folding section; 74. Second insulating element; 740. Through hole; 741. Second main body section; 742. Second folding section; 743. Bending mark; 7431. Marking hole; 744. Electrode lead-out hole; 745. Pressure relief lead-out hole; 8. Pressure strip; 9. Buffer; 10. Accommodation gap; 11. Pressure relief mechanism; X, First direction; Y, Second direction; Z, Third direction. Detailed Implementation

[0046] 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.

[0047] 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.

[0048] 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.

[0049] 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.

[0050] 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.

[0051] 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.

[0052] 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.

[0053] In this application, "multiple" means two or more (including two).

[0054] 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.

[0055] 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.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] In some embodiments, the liquid electrolyte includes an electrolyte salt and a solvent.

[0061] 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.

[0062] 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.

[0063] Gel electrolytes consist of a polymer-based electrolyte backbone network combined with an ionic liquid—lithium salt.

[0064] Solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0065] 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.

[0066] 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.

[0067] As an example, composite solid electrolytes are formed by adding inorganic solid electrolyte fillers to polymer solid electrolytes.

[0068] In some embodiments, the electrode assembly can be a wound structure, a stacked structure, or a hybrid structure of wound and stacked.

[0069] 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.

[0070] 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.

[0071] 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 be provided one or more.

[0072] 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.

[0073] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0078] 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.

[0079] 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.

[0080] 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.

[0081] 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.

[0082] 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.

[0083] 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, electrode terminals, a first insulating member, and a second insulating member. The electrode assembly includes tabs and is housed in the casing. The casing includes a first shell wall and a second shell wall. The first shell wall is connected to the outer periphery of the second shell wall and surrounds the electrode assembly. The electrode terminals are disposed on the second shell wall and electrically connected to the tabs. At least a portion of the first insulating member surrounds the first shell wall and is connected to the first shell wall. The first insulating member has a first opening. At least a portion of the second insulating member covers the second shell wall from the outside. The second insulating member is connected to the first insulating member and covers the edge of the first opening. The second insulating member has a through hole for accommodating an adhesive member bonded to the second shell wall. In the above structure, since the second insulating member, which covers the second shell wall from the outside, connects to the first insulating member and covers the edge of the first opening formed by the first insulating member from the outside, the edge of the first opening of the first insulating member is less likely to lift up. This allows the first insulating member to be more firmly and reliably connected to the first shell wall, enabling the first insulating member to stably play an insulating and isolating role, reducing the possibility of short circuit between the shell and external devices, and improving the reliability of the battery cell.

[0084] The battery cells described in the embodiments of this application are applicable to battery devices and electrical devices that use battery devices.

[0085] 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.

[0086] 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.

[0087] Figure 1 The diagram shows the structural features of a vehicle provided in some embodiments of this application.

[0088] 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.

[0089] 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.

[0090] 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.

[0091] 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.

[0092] 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.

[0093] 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.

[0094] 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.

[0095] Some embodiments of this application provide a single battery cell, see reference. Figure 3 and Figure 4The battery cell 7 includes an electrode assembly 70, a housing 71, electrode terminals 72, a first insulating member 73, and a second insulating member 74. The electrode assembly 70 includes tabs and is housed within the housing 71. The housing 71 includes a first housing wall 711 and a second housing wall 712. The first housing wall 711 is connected to the outer periphery of the second housing wall 712 and surrounds the electrode assembly 70. The electrode terminals 72 are disposed on the second housing wall 712 and electrically connected to the tabs. At least a portion of the first insulating member 73 surrounds the first housing wall 711 and is connected to the first housing wall 711. (Continuing to refer to...) Figure 3 The first insulating member 73 has a first opening 730; at least a portion of the second insulating member 74 covers the second shell wall 712 from the outside, and the second insulating member 74 is connected to the first insulating member 73 and covers the edge of the first opening 730. (Refer to...) Figure 5 The second insulating member 74 is provided with a through hole 740, which is used to accommodate the adhesive that is bonded to the second shell wall 712.

[0096] Electrode assembly 70 is a component in the battery cell 7 where an electrochemical reaction occurs, and it is housed within a casing 71. The casing 71 may contain one or more electrode assemblies 70. Electrode assembly 70 may include electrodes and separators. The electrodes may include positive or negative electrodes of opposite polarity, and the positive and negative electrodes may serve as the positive and negative electrodes, respectively. The separators are stacked between the positive and negative electrodes to isolate them.

[0097] The electrode assembly 70 may include an electrode body and a tab, the tab extending from one end of the electrode body for electrical connection with the electrode terminal 72 to draw out the current from the electrode assembly 70.

[0098] 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.

[0099] The first shell wall 711 and the second shell wall 712 are different wall structures in the outer shell 71. The first shell wall 711 is a wall structure surrounding the outer periphery of the electrode assembly 70, and the first shell wall 711 is sealed to the outer periphery of the second shell wall 712. Exemplarily, the first shell wall 711 is configured as a cylindrical structure with openings at both ends, and the second shell wall 712 covers one opening and is sealed to the first shell wall 711.

[0100] The electrode terminal 72 can be a structure 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.

[0101] The electrode terminal 72 is disposed on the second housing wall 712. This can be either a single electrode terminal 72 disposed on the second housing wall 712, or two electrode terminals 72 with opposite polarities disposed at intervals on the second housing wall 712. The electrode terminal 72 is electrically connected to the electrode tab. This connection can be either direct or indirect via a current collector.

[0102] The first insulating element 73 may be a partial film 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.

[0103] At least a portion of the first insulating member 73 surrounds and is connected to the first shell wall 711. This can be achieved by having the entire first insulating member 73 surround the outer surface of the first shell wall 711 and be attached to the first shell wall 711, so that the entire first insulating member 73 covers the outer surface of the first shell wall 711. Alternatively, a portion of the first insulating member 73 surrounds the outer surface of the first shell wall 711 and is attached to the first shell wall 711, while another portion of the first insulating member 73 is attached to the outer surface of the second shell wall 712.

[0104] The first insulating member 73 has a first opening 730, which means that the first insulating member 73 forms a first opening 730 without insulating material. The first opening 730 can be an opening that is oriented along the thickness direction of the second shell wall 712. The first opening 730 allows the portion of the outer surface corresponding to the second shell wall 712 to be directly exposed to the outside world, and can be directly connected to external devices, so that the shell 71 can be directly subjected to force.

[0105] The second insulating member 74 can be an insulating film structure used to cover a portion of the outer surface of the second housing wall 712. The second insulating member 74 can insulate the housing 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 74 and the first insulating member 73 are interconnected, forming an insulating film structure covering the outer surface of the housing 71 to insulate the housing 71 from external devices and adjacent battery cells 7.

[0106] At least a portion of the second insulating member 74 covers the second housing wall 712 from the outside. This can mean that the entire second insulating member 74 is attached to the outer surface of the second housing wall 712, so that the entire second insulating member 74 covers the outer surface of the second housing wall 712. Alternatively, a portion of the second insulating member 74 is attached to the outer surface of the first housing wall 711, and another portion of the second insulating member 74 extends to the outside of the first housing wall 711.

[0107] The second insulating member 74 is connected to the first insulating member 73 and covers the edge of the first opening 730. This can mean that part of the second insulating member 74 is attached to the outside of the first insulating member 73 and covers the edge of the first opening 730 formed by the first insulating member 73. This makes it less likely for the first insulating member 73 at the edge of the first opening 730 to lift up, so that the first insulating member 73 can be more firmly and reliably connected to the first shell wall 711.

[0108] The through-hole 740 can be a hole-like structure provided on the second insulating member 74, which penetrates the second insulating member 74 along its thickness direction, allowing the through-hole 740 to connect the outer surface of the second insulating member 74 to the outside. The through-hole 740 is used to accommodate an adhesive component bonded to the second shell wall 712. Specifically, the adhesive component is provided in the through-hole 740 that connects the outer surface of the second insulating member 74 to the outside, and the adhesive component can be bonded to the second shell wall 712, allowing external components such as the pressure strip 8 and heat exchange components to be bonded to the second shell wall 712 through the adhesive component, achieving a firm connection with the second shell wall 712.

[0109] In the above structure, since the second insulating member 74, which covers the second shell wall 712 from the outside, connects to the first insulating member 73 and covers the edge of the first opening 730 formed by the first insulating member 73 from the outside, the edge of the first opening 730 of the first insulating member 73 is less likely to lift up. This allows the first insulating member 73 to be more firmly and reliably connected to the first shell wall 711, enabling the first insulating member 73 to stably play an insulating and isolating role, reducing the possibility of short circuit between the shell 71 and external devices, and improving the reliability of the battery cell 7.

[0110] In some embodiments, continue to refer to Figure 3 The first insulating member 73 includes a first main body portion 731 and a first folded portion 732 connected to each other. The first main body portion 731 covers the first shell wall 711. The first folded portion 732 is bent relative to the first main body portion 731 and covers the second shell wall 712. The first folded portion 732 forms a first opening 730. A portion of the second insulating member 74 and at least a portion of the first folded portion 732 are stacked along the thickness direction of the second insulating member 74.

[0111] The first main body portion 731 and the first folded portion 732 are two interconnected parts of the first insulating member 73. The first main body portion 731 is the part of the first insulating member 73 that covers the second shell wall 712, and the first folded portion 732 is the part of the first insulating member 73 that is bent relative to the first main body portion 731. It covers the second shell wall 712 and forms a first opening 730, such that the first opening 730 is formed on the outside of the second shell wall 712.

[0112] The fact that a portion of the second insulating member 74 and at least a portion of the first folded portion 732 are stacked along the thickness direction of the second insulating member 74 can mean that a portion of the second insulating member 74 covers the outer side of the first folded portion 732 to cover the edge of the first opening 730 formed by the first insulating member 73.

[0113] For example, the entire first folded portion 732 may be covered by the second insulating member 74, so that the second insulating member 74 and the first folded portion 732 have a large overlapping area, so that the second insulating member 74 has a better covering effect on the edge of the first opening 730, making the edge portion of the first opening 730 of the first insulating member 73 less prone to lifting; or the portion of the first folded portion 732 near the first opening 730 may be covered by the second insulating member 74, so that the edge of the first opening 730 is covered by the second insulating member 74, making the edge portion of the first opening 730 of the first insulating member 73 less prone to lifting.

[0114] In some embodiments, the shortest distance from the edge of the first opening 730 to the outer surface of the first shell wall 711 is D, where D ≥ 2 mm.

[0115] By setting the range of the shortest distance D between the edge of the first opening 730 and the outer surface of the first shell wall 711 to D≥2mm, not only does the first folded portion 732 have sufficient coverage area on the second shell wall 712, which is beneficial to increase the creepage distance between the second shell wall 712 and external devices, so that the first insulating member 73 can better play the role of insulation and isolation, but the first folded portion 732 forming the first opening 730 also has sufficient size to facilitate processing.

[0116] For example, the shortest distance D between the edge of the first opening 730 and the outer surface of the first shell wall 711 can be 3mm, 5mm or 6mm. Those skilled in the art can set the shortest distance D between the edge of the first opening 730 and the outer surface of the first shell wall 711 according to the actual situation so that the first folded part 732 has sufficient coverage area on the second shell wall 712.

[0117] In some embodiments, reference Figure 6The second insulating member 74 includes a second main body portion 741 and a second folded portion 742 connected to each other. The second folded portion 742 is bent relative to the second main body portion 741 and stacked with the first main body portion 731 along the thickness direction of the first main body portion 731. A portion of the second main body portion 741 covers the second shell wall 712, and a portion of the second main body portion 741 and the first folded portion 732 are stacked along the thickness direction of the second main body portion 741.

[0118] The second main body portion 741 and the second folded portion 742 are two interconnected parts of the second insulating member 74. The second main body portion 741 is the part of the second insulating member 74 that covers the second shell wall 712, and the second folded portion 742 is the part of the second insulating member 74 that is bent relative to the second main body portion 741. It covers the outer side of the first main body portion 731 and overlaps with the first main body portion 731 along the thickness direction of the first main body portion 731, so that the second insulating member 74 not only covers the first folded portion 732, but also covers part of the first main body portion 731, increasing the area of ​​the overlapping region between the second insulating member 74 and the first insulating member 73, which is beneficial to improving the connection strength between the second insulating member 74 and the first insulating member 73.

[0119] By partially covering the second shell wall 712 with the second main body 741, and stacking the second main body 741 and the first folded portion 732 along the thickness direction of the second main body 741, the second main body 741 can both connect to the second shell wall 712 and cover the first folded portion 732. This results in the stacking of the second insulating member 74 and the first insulating member 73 including not only the stacking of the second folded portion 742 and the first main body 731, but also the stacking of the second main body 741 and the first folded portion 732, thereby increasing the area of ​​the stacked region of the first insulating member 73 and the second insulating member 74.

[0120] In some embodiments, along the unfolding direction of the second insulating member 74, the shortest distance from the through hole 740 to the outer surface of the first shell wall 711 is L, and the shortest distance from the edge of the first opening 730 to the outer surface of the first shell wall 711 is D, where 2mm≤L≤D+5mm.

[0121] The shortest distance from the through hole 740 to the outer surface of the first shell wall 711 is set to L, and the shortest distance from the edge of the first opening 730 to the outer surface of the first shell wall 711 is set to D. By setting the relationship between the two to 2mm≤L≤D+5mm, not only does the material between the through hole 740 and the outer surface of the first shell wall 711 have sufficient width and good strength, but it can also provide a large coverage area for the edge of the first opening 730 surrounded by the first insulating member 73, making the first insulating member 73 less prone to lifting or falling off; at the same time, it also makes the through hole 740 have a large cross-sectional area to accommodate the adhesive.

[0122] The relationship between the shortest distance L from the through hole 740 to the outer surface of the first shell wall 711 and the shortest distance D from the edge of the first opening 730 to the outer surface of the first shell wall 711 can be set to 3mm≤L≤D+4mm. For example, L=D+2mm, L=D+3mm or L=D+4mm. This not only ensures that the material between the through hole 740 and the edge of the second insulating member 74 has sufficient width to provide a large coverage area for the edge of the first opening 730 surrounded by the first insulating member 73, making it less likely for the first insulating member 73 to lift or fall off, but also allows the through hole 740 to have a large cross-sectional area to accommodate the adhesive.

[0123] In some embodiments, reference Figure 7 The first opening 730 is formed on the outside of the first shell wall 711. The second insulating member 74 includes a second main body portion 741 and a second folded portion 742 connected to each other. The second main body portion 741 covers the second shell wall 712, and the second folded portion 742 is bent relative to the second main body portion 741. Along the thickness direction of the first insulating member 73, the second folded portion 742 is stacked with at least a portion of the first insulating member 73, and the first insulating member 73 stacked with the second folded portion 742 forms the first opening 730.

[0124] Similar to the aforementioned technical solution, the second main body portion 741 and the second folded portion 742 are two interconnected parts of the second insulating member 74. The second folded portion 742 is the part of the second insulating member 74 that covers the second shell wall 712. The second folded portion 742 is the part of the second insulating member 74 that is bent relative to the second main body portion 741, and it is bent toward the direction of the first shell wall 711 to cover at least a portion of the first insulating member 73. The at least a portion of the first insulating member 73 is stacked with the second folded portion 742.

[0125] A first opening 730 is formed on the outer side of the first shell wall 711, and is surrounded by a first insulating member 73 stacked with the second folded portion 742. (Reference) Figure 8 By having the second folded portion 742 cover the portion of the first insulating member 73 that forms the first opening 730, the second folded portion 742 covers the edge of the first opening 730, making it less likely for the edge of the first opening 730 to lift up, and allowing the first insulating member 73 to be more firmly and reliably connected to the first shell wall 711.

[0126] In some embodiments, reference Figure 9 and Figure 10 The second insulating member 74 is provided with a bending mark 743, which is located at the connection between the second main body 741 and the second folded part 742.

[0127] The bend mark 743 can be used to indicate the portion where the second folded portion 742 is bent relative to the second main body portion 741. By providing the bend mark 743 at the connection between the second main body portion 741 and the second folded portion 742, an operator can bend the second insulating member 74 along the bend mark 743 when attaching the second insulating member 74 to the housing 71, so that the second main body portion 741 covers the second housing wall 712, and the second folded portion 742 covers the outer surface of the first main body portion 731 attached to the outside of the first housing wall 711.

[0128] In some embodiments, the second insulating member 74 is provided with a thinning structure located at the connection between the second main body portion 741 and the second folded portion 742. The thickness of the thinning structure is less than the thickness of the second main body portion 741 and less than the thickness of the second folded portion 742. The thinning structure forms a bending mark 743.

[0129] The thinning structure can be a structure that reduces the thickness of the second insulating member 74. By reducing the thickness of the second insulating member 74, the stiffness of this part can be reduced. By providing a thinning structure at the connection between the second main body 741 and the second folded part 742, the operator can more easily bend the second insulating member 74 at the thinning structure, thereby achieving the bending of the second folded part 742 relative to the second main body 741.

[0130] By setting the thickness of the thinning structure to be less than the thickness of the second main body 741 and the thickness of the thinning structure to be less than the thickness of the second folded portion 742, the stiffness of the thinning structure is less than the stiffness of the second main body 741 and the stiffness of the second folded portion 742, and the stiffness of the connection between the second main body 741 and the second folded portion 742 is less than the stiffness of the second main body 741 and the stiffness of the second folded portion 742.

[0131] By forming a bending mark 743 in the thinned structure, the operator can more easily bend the second folded portion 742 relative to the second main body portion 741 when bending the second insulating member 74 along the bending mark 743, making it easier to attach the second insulating member 74 to the surface of the outer casing 71.

[0132] The thinning structure can be formed on the second insulating member 74 by a material removal process. For example, the thinning structure can be formed by etching grooves on the second insulating member 74.

[0133] In some embodiments, continue to refer to Figure 10 The second insulating member 74 is provided with a plurality of marking holes 7431, which are spaced apart at the connection between the second main body 741 and the second folded part 742 to form a bending mark 743.

[0134] The marking hole 7431 can be a hole-like structure provided on the second insulating member 74, which penetrates the second insulating member 74 along its thickness direction. By providing multiple marking holes 7431 at intervals at the connection between the second main body 741 and the second folded part 742, the multiple marking holes 7431 can reduce the rigidity of the connection between the second main body 741 and the second folded part 742. This allows the multiple marking holes 7431 to not only serve as markings for bending, but also to make it easier for operators to bend the second insulating member 74 at the locations where the multiple marking holes 7431 are provided.

[0135] In some embodiments, the first shell wall 711 forms a second opening, and the second shell wall 712 covers the second opening, with reference to the orientation of the second opening. Figure 11 The length of the second folded part 742 is H, where H ≥ 2 mm.

[0136] The second opening may be an opening at one end of the first housing wall 711 surrounding the electrode assembly 70, which is used to install components such as the electrode assembly 70 into the first housing wall 711. By covering the second opening with the second housing wall 712, the second opening is sealed, allowing the housing 71 to form a sealed space.

[0137] By setting the length H of the second folded portion 742 along the orientation of the second opening to H≥2mm, not only does the second folded portion 742 have sufficient size for processing and forming, but it also ensures that the second folded portion 742 has sufficient area on the outside of the first shell wall 711 to cover the first insulating member 73. This is beneficial for increasing the stacking area of ​​the second insulating member 74 and the first insulating member 73, and improving the connection strength between the second insulating member 74 and the first insulating member 73.

[0138] For example, the length H of the second folded portion 742 along the direction of the second opening can be 3mm, 5mm or 6mm. Those skilled in the art can set the length H of the second folded portion 742 along the direction of the second opening according to the actual situation so that the second folded portion 742 has sufficient coverage area for the first insulating member 73.

[0139] In some embodiments, reference Figure 12 Along the orientation of the second opening, the second folded portion 742 is disposed through the outer side of the first shell wall 711.

[0140] The orientation of the second opening is set to the first direction X. The second folded portion 742 is disposed through the entire outer side of the first shell wall 711 along the first direction X. This not only allows the second folded portion 742 and the first insulating member 73 to have a large coverage area, thereby improving the connection strength between the second insulating member 74 and the first insulating member 73, but also allows the stacking of the second folded portion 742 and the first insulating member 73 to improve the insulation and isolation effect on the outer shell 71.

[0141] In some embodiments, reference Figure 13 The first shell wall 711 includes two first wall bodies 7111 disposed opposite to each other along the second direction Y and two second wall bodies 7112 disposed opposite to each other along the third direction Z. The first wall bodies 7111 are connected between the two second wall bodies 7112. The second direction Y, the third direction Z and the first direction X are perpendicular to each other. At least one of the first wall bodies 7111 and the second wall bodies 7112 has a second folded portion 742 on its outer side.

[0142] The first wall 7111 and the second wall 7112 are part of the wall structure in the first shell wall 711. The two first walls 7111 are arranged at intervals relative to each other along the second direction Y, and the two second walls 7112 are arranged at intervals relative to each other along the third direction Z. The first walls 7111 and the second walls 7112 are sequentially and alternately connected along the circumference of the first shell wall 711 to form a first shell wall 711 with a cylindrical structure.

[0143] By making the second direction Y, the third direction Z and the first direction X perpendicular to each other, the relative directions of the two first walls 7111, the relative directions of the two second walls 7112, and the relative directions of the second opening and the third opening are perpendicular to each other.

[0144] At least one of the first wall body 7111 and the second wall body 7112 has a second folded portion 742 on its outer side. This can mean that the second folded portion 742 is only provided on the outer side of one of the first wall bodies 7111, and the second folded portion 742 covers the outer surface of the first insulating member 73 on the outer side of the first wall body 7111; it can also mean that the second folded portion 742 is provided on the outer side of both first wall bodies 7111, and the second folded portion 742 covers the outer surface of the first insulating member 73 on the outer side of both first wall bodies 7111; or it can mean that the second folded portion 742 is only provided on the outer side of one of the second wall bodies 7112, and the second... The folded portion 742 covers the outer surface of the first insulating member 73 on the outer side of the second wall 7112; or it can mean that the outer sides of both second walls 7112 are provided with second folded portions 742, and the second folded portions 742 cover the outer surfaces of the first insulating members 73 on the outer sides of both second walls 7112; similarly, it can mean that the outer sides of both first walls 7111 and both second walls 7112 are provided with second folded portions 742, and the second folded portions 742 are arranged in a ring and cover the outer surfaces of the first insulating members 73 on the outer sides of both second walls 7112 and both first walls 7111.

[0145] In some embodiments, the area of ​​the first wall 7111 is smaller than the area of ​​the second wall 7112, and the outer sides of both first walls 7111 are provided with second folding portions 742.

[0146] The area of ​​the first wall 7111 is smaller than that of the second wall 7112. This means that the first wall 7111 has a smaller area than the second wall 7112, making the outer surface of the first wall 7111 the smaller outer surface of the first shell wall 711. By providing second folded portions 742 on the outer sides of both first walls 7111, the second folded portions 742 are positioned on the smaller outer surface of the first shell wall 711. This not only enhances the connection strength between the second insulating member 74 and the first insulating member 73, but also prevents material waste due to excessively large areas of the second folded portions 742.

[0147] In some embodiments, the thickness of the second insulating member 74 is greater than the thickness of the first insulating member 73.

[0148] By setting the thickness of the second insulating member 74 to be greater than that of the first insulating member 73, the second insulating member 74 has greater structural strength and better covers the first insulating member 73, which helps to further reduce the possibility of the first insulating member 73 lifting or falling off.

[0149] In some embodiments, the flame retardant rating of the second insulator 74 is higher than that of the first insulator 73.

[0150] By setting the flame retardant rating of the second insulating component 74 to be higher than that of the first insulating component 73, the second insulating component 74 achieves better flame retardant performance. Since the electrode terminals 72 used for connecting to external devices are located on the second housing wall 712, setting the flame retardant rating of the second insulating component 74 covering the second housing wall 712 to be higher than that of the first insulating component 73 effectively reduces problems such as ignition caused by electrical sparks from the connection between the electrode terminals 72 and external devices, thus improving the reliability of the battery cell 7.

[0151] For example, the flame retardant rating of the second insulating component 74 and the flame retardant rating of the first insulating component 73 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.

[0152] In some embodiments, the second insulating member 74 is provided with an electrode lead-out hole 744, through which the electrode terminal 72 passes.

[0153] The electrode lead-out hole 744 can be a hole-like structure provided on the second insulating member 74, which penetrates the second insulating member 74 along the thickness direction of the second insulating member 74, and is used to allow the electrode terminal 72 provided on the second shell wall 712 to extend out.

[0154] By allowing the electrode terminal 72 to pass through the electrode lead-out hole 744 of the second insulating member 74, the electrode terminal 72 can extend through the second insulating member 74, facilitating the connection of the electrode terminal 72 with external devices.

[0155] In some embodiments, a pressure relief mechanism 11 is provided on the second shell wall 712, and a pressure relief outlet hole 745 is provided on the second insulating member 74, which is connected to the pressure relief mechanism 11.

[0156] The pressure relief mechanism 11 is used to release the internal gas of the battery cell 7. It is actuated when the internal pressure or temperature of the battery cell 7 reaches a predetermined threshold to release the internal pressure or temperature. When the internal pressure or temperature of the battery cell 7 reaches the predetermined threshold, the pressure relief mechanism 11 performs an action or a weak structure provided in the pressure relief mechanism 11 is destroyed, thereby forming an opening or channel for the internal pressure or temperature to be released.

[0157] The pressure relief outlet 745 extends through the second insulating member 74 along the thickness direction and is connected to the pressure relief mechanism 11, so that the substance discharged from the pressure relief mechanism 11 can be discharged from the pressure relief outlet 745.

[0158] Some embodiments of this application also provide a battery device 2, which will continue to be referenced. Figure 2 The battery device 2 includes a housing 5, an adhesive component, 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 second shell wall 712 of the battery cell 7 through the adhesive component.

[0159] 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, which helps to maintain the structural stability of the overall structure formed by the battery cells 7. The adhesive component can be a component used to firmly connect the pressure strip 8 to the outer shell 71 of the battery cell 7. The pressure strip 8 is bonded to the second shell wall 712 of the battery cell 7 through the adhesive component, so that the pressure strip 8 can be firmly connected to the outer surface of the second shell wall 712.

[0160] For example, the adhesive may be formed by curing adhesive filling the through hole 740, so that the adhesive can be firmly bonded to the outer surface of the second shell wall 712 and the pressure strip 8.

[0161] In some embodiments, a plurality of battery cells 7 are provided, and a portion of the second insulating member 74 of the battery cell 7 is located between the outer casings 71 of two adjacent battery cells 7, with the second insulating members 74 of two adjacent battery cells 7 abutting each other.

[0162] There are multiple battery cells 7, which can be arranged along the second direction Y, such that the first wall 7111 of the battery cells 7 are arranged adjacent to each other along the second direction Y.

[0163] By positioning a portion of the second insulating member 74 of the battery cell 7 between the outer casings 71 of two adjacent battery cells 7, the portion of the second insulating member 74 can be sandwiched between the two adjacent battery cells 7. The second insulating members 74 of the two adjacent battery cells 7 abutting each other can mean that the second insulating members 74 of the two adjacent battery cells 7 are in direct contact, allowing the second insulating member 74 to act as a buffer between the outer casings 71 of the two adjacent battery cells 7.

[0164] In some embodiments, reference Figure 14 and Figure 15 A receiving gap 10 is formed between two adjacent battery cells 7. The receiving gap 10 and the second insulating member 74 located between two adjacent housings 71 are arranged along the orientation of the first opening 730 in the battery cell 7. The battery device 2 also includes a buffer member 9, which is located in the receiving gap 10 and abuts against the two adjacent housings 71.

[0165] The accommodating gap 10 can be a gap formed between the outer casings 71 of two adjacent battery cells 7. By arranging the accommodating gap 10 and the second insulating member 74 located between two adjacent outer casings 71 along the orientation of the first opening 730 in the battery cell 7, the accommodating gap 10 and the second insulating member 74 between two adjacent outer casings 71 can be arranged in an orderly manner.

[0166] The buffer 9 is an elastic structure, which is disposed between two adjacent battery cells 7 to buffer or absorb the volume expansion of the battery cells 7. By placing the buffer 9 in the receiving gap 10 and abutting against the two adjacent housings 71, both the buffer 9 and the second insulating member 74 located between the two adjacent housings 71 are clamped by the two adjacent housings 71, which can buffer or absorb the volume expansion of the battery cells 7.

[0167] 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.

[0168] Some embodiments of this application provide a battery cell 7, which includes an electrode assembly 70, a housing 71, electrode terminals 72, a first insulating member 73, and a second insulating member 74. The electrode assembly 70 includes tabs and is housed in the housing 71. The housing 71 includes a first housing wall 711 and a second housing wall 712. The first housing wall 711 is connected to the outer periphery of the second housing wall 712 and surrounds the electrode assembly 70. The electrode terminals 72 are disposed on the second housing wall 712 and electrically connected to the tabs. The first main body 731 of the first insulating member 73 surrounds the first housing wall 711. It is connected to the first shell wall 711. The first folded portion 732 of the first insulating member 73 is bent relative to the first main body portion 731 and covers the second shell wall 712. The first folded portion 732 forms a first opening 730. A portion of the second insulating member 74 covers the second shell wall 712 from the outside. Another portion of the second insulating member 74 is connected to the first insulating member 73 from the outside and covers the edge of the first opening 730. The second insulating member 74 is provided with a through hole 740 communicating with the outer surface of the second shell wall 712. The adhesive through hole 740 is used to accommodate the adhesive that is bonded to the second shell wall 712.

[0169] In the above structure, since the second insulating member 74, which covers the second shell wall 712 from the outside, connects to the first insulating member 73 and covers the edge of the first opening 730 formed by the first insulating member 73 from the outside, the edge of the first opening 730 of the first insulating member 73 is less likely to lift up. This allows the first insulating member 73 to be more firmly and reliably connected to the first shell wall 711, enabling the first insulating member 73 to stably play an insulating and isolating role, reducing the possibility of short circuit between the shell 71 and external devices, and improving the reliability of the battery cell 7.

[0170] 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 by, include: Electrode assembly, including tabs; A housing, in which the electrode assembly is housed, the housing including a first housing wall and a second housing wall, the first housing wall being connected to the outer periphery of the second housing wall and surrounding the electrode assembly; Electrode terminals are disposed on the second housing wall and electrically connected to the electrode tabs; A first insulating member, at least a portion of which surrounds and is connected to the first housing wall, the first insulating member having a first opening; A second insulating member, at least a portion of which covers the second shell wall from the outside, is connected to the first insulating member and covers the edge of the first opening. The second insulating member has a through hole for accommodating an adhesive member bonded to the second shell wall.

2. The battery cell of claim 1, wherein, The first insulating member includes a first main body portion and a first folded portion connected to each other. The first main body portion covers the first shell wall, and the first folded portion is bent relative to the first main body portion and covers the second shell wall. The first folded portion forms the first opening, and a portion of the second insulating member and at least a portion of the first folded portion are stacked along the thickness direction of the second insulating member.

3. The battery cell of claim 2, wherein, The shortest distance from the edge of the first opening to the outer surface of the first shell wall is D, where D ≥ 2 mm.

4. The battery cell according to claim 2 or 3, characterized in that, The second insulating member includes a second main body portion and a second folded portion connected to each other. The second folded portion is bent relative to the second main body portion and stacked with the first main body portion along the thickness direction of the first main body portion. A portion of the second main body portion covers the second shell wall, and a portion of the second main body portion is stacked with the first folded portion along the thickness direction of the second main body portion.

5. The battery cell according to claim 2 or 4, characterized in that, The shortest distance from the edge of the through hole to the outer surface of the first shell wall is L, and the shortest distance from the edge of the first opening to the outer surface of the first shell wall is D, where 2mm≤L≤D+5mm.

6. The battery cell of claim 1, wherein, The first opening is formed on the outside of the first shell wall. The second insulating member includes a second main body portion and a second folded portion that are connected to each other. The second main body portion covers the second shell wall, and the second folded portion is bent relative to the second main body portion. Along the thickness direction of the first insulating member, the second folded portion is stacked with at least a portion of the first insulating member, and the first insulating member stacked with the second folded portion forms the first opening.

7. The battery cell according to claim 4 or 6, characterized in that The second insulating component is provided with a bending mark, which is located at the connection between the second main body and the second folded part.

8. The battery cell of claim 7, wherein, The second insulating member has a thinning structure located at the connection between the second main body and the second folded portion. The thickness of the thinning structure is less than the thickness of the second main body and less than the thickness of the second folded portion. The thinning structure forms the bending mark.

9. The battery cell of claim 7, wherein, The second insulating member is provided with a plurality of marking holes, which are spaced apart at the connection between the second main body and the second folded part to form the bending markings.

10. The battery cell according to claim 4 or 6, characterized in that, The first shell wall forms a second opening, and the second shell wall covers the second opening. Along the orientation of the second opening, the length of the second fold is H, where H ≥ 2 mm.

11. The battery cell of claim 10, wherein, Along the orientation of the second opening, the second folded portion is disposed through the outer side of the first shell wall.

12. The battery cell of claim 11, wherein, The first shell wall includes two first walls arranged opposite each other along a second direction and two second walls arranged opposite each other along a third direction. The first walls are connected between the two second walls. The second direction, the third direction and the orientation of the second opening are perpendicular to each other. At least one of the first walls and the second walls has a second folded portion on its outer side.

13. The battery cell of claim 12, wherein, The area of ​​the first wall is smaller than that of the second wall, and the second folding portion is provided on the outer side of both first walls.

14. The battery cell of any one of claims 1 to 13, wherein, The thickness of the second insulating element is greater than the thickness of the first insulating element.

15. The battery cell of any one of claims 1 to 13, wherein, The flame retardant rating of the second insulating component is higher than that of the first insulating component.

16. The battery cell of any one of claims 1 to 13, wherein, The second insulating member is provided with an electrode lead-out hole, through which the electrode terminal passes.

17. A battery device characterized by comprising: The device includes a housing, an adhesive element, a pressure strip, and a battery cell as described in any one of claims 1 to 16, 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 second shell wall of the battery cell via the adhesive element.

18. The battery device of claim 17, wherein, The battery cell is provided in multiple parts, and part of the second insulating member of the battery cell is located between the outer shells of two adjacent battery cells, and the second insulating members of two adjacent battery cells abut against each other.

19. The battery device of claim 18, wherein, A receiving gap is formed between two adjacent battery cells, and the receiving gap and a second insulating member located between two adjacent housings are arranged along the orientation of a first opening in the battery cell. The battery device also includes a buffer member located in the receiving gap and abutting against the two adjacent housings.

20. An electrical device, comprising: Includes the battery device as described in any one of claims 17 to 19, the battery device being used to provide electrical energy.

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