Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device, and relates to the field of batteries. The battery device comprises a box body and a battery monomer, the box body comprises a plurality of wall parts, the plurality of wall parts jointly define an accommodating space, and the battery monomer is accommodated in the accommodating space. The battery monomer comprises an electrode assembly, the electrode assembly comprises a positive pole piece, a solid electrolyte layer and a negative pole piece, and the solid electrolyte layer is arranged between the positive pole piece and the negative pole piece. Wherein at least one wall part is provided with a heat insulation structure. The battery device is provided with the heat insulation structure, and the heat insulation structure can reduce the outward transfer speed of heat, delay heat loss and play a role in heat preservation. Therefore, the single battery can work in a high-temperature state, the ionic conductivity of the solid electrolyte layer can be improved, the internal resistance of the battery device can be reduced, and the energy density of the battery device can be improved.

Description

Technical Field

[0001] The present application relates to the field of batteries, and more specifically, to a battery device and an electrical device. Background Art

[0002] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. The development of battery technology requires consideration of multiple design factors, including performance parameters such as discharge capacity and charge / discharge rate. Furthermore, the battery's energy density must be considered. However, current batteries have a relatively low energy density. Utility Model Content

[0003] The purpose of the embodiments of the present application is to provide a battery device and an electrical device, which are intended to improve the problem of low energy density of batteries in the related art.

[0004] In a first aspect, an embodiment of the present application provides a battery device, comprising a case and a battery cell, wherein the case comprises a plurality of walls, and the plurality of walls together define a storage space; the battery cell is accommodated in the storage space, and the battery cell comprises an electrode assembly, wherein the electrode assembly comprises a positive electrode sheet, a solid electrolyte layer and a negative electrode sheet, and the solid electrolyte layer is arranged between the positive electrode sheet and the negative electrode sheet; wherein at least one of the walls is provided with a heat insulation structure.

[0005] In the above technical solution, the battery device is equipped with a thermal insulation structure that reduces the rate of heat transfer, delays heat loss, and provides insulation. This facilitates the operation of the battery cells at high temperatures, which helps improve the ionic conductivity of the solid electrolyte layer, reduce the internal resistance of the battery device, and increase the energy density of the battery device.

[0006] As an optional technical solution of an embodiment of the present application, the thermal insulation structure includes a first thermal insulation layer, and the first thermal insulation layer is arranged on a side of the wall portion facing the accommodating space.

[0007] In the above technical solution, by placing the first thermal insulation layer on the side of the wall facing the storage space, the wall protects the first thermal insulation layer, making it less susceptible to damage and ensuring stable insulation. Furthermore, the first thermal insulation layer is closer to the battery cells, making heat less likely to dissipate and providing better insulation.

[0008] As an optional technical solution of an embodiment of the present application, the first insulation layer is a hollow insulation structure.

[0009] In the above technical solution, the first thermal insulation layer is a hollow thermal insulation structure. The thermal insulation effect of the first thermal insulation layer is good, and the weight of the first thermal insulation layer is small, which is conducive to improving the energy density of the battery device.

[0010] As an optional technical solution of an embodiment of the present application, the first thermal insulation layer is made of a thermal insulation material.

[0011] In the above technical solution, the first thermal insulation layer is made of a thermal insulation material, and the thermal insulation effect of the first thermal insulation layer is better, which can further reduce the speed of heat transfer to the outside, delay heat loss, and enable the battery cell to operate in a high-temperature state, which is beneficial to improving the ionic conductivity of the solid electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0012] As an optional technical solution of an embodiment of the present application, the thermal conductivity of the first heat-insulating layer is less than or equal to 0.03 W / (m·K).

[0013] In the above technical solution, when the thermal conductivity of the first insulation layer is less than or equal to 0.03 W / (m·K), the thermal insulation effect of the first insulation layer is better, which is conducive to allowing the battery cell to operate at a high temperature, and is conducive to improving the ionic conductivity of the solid electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0014] As an optional technical solution of an embodiment of the present application, the thermal insulation structure includes a thermal insulation cavity formed in the wall portion.

[0015] In the above technical solution, the heat insulation structure includes a heat insulation cavity formed in the wall portion, which, on the one hand, has a good heat insulation effect. On the other hand, the heat insulation structure does not occupy the internal space of the box, which is conducive to improving the energy density of the battery cell.

[0016] As an optional technical solution of the embodiment of the present application, the insulation cavity is a vacuum environment.

[0017] In the above technical solution, the vacuum environment has good thermal insulation performance, which can reduce the speed of heat transfer to the outside, delay heat loss, and make the battery cells work in a high-temperature state, which is beneficial to improve the ionic conductivity of the solid electrolyte layer, reduce the internal resistance of the battery device, and improve the energy density of the battery device.

[0018] As an optional technical solution of the embodiment of the present application, the insulation cavity contains an insulation medium.

[0019] In the above technical solution, by accommodating the heat insulating medium in the heat insulating cavity, the manufacturing process is relatively simple, which is beneficial to controlling the manufacturing cost and has a good heat insulating effect.

[0020] As an optional technical solution of an embodiment of the present application, the thermal conductivity of the thermal insulation medium is less than or equal to 0.03 W / (m·K).

[0021] In the above technical solution, when the thermal conductivity of the insulation medium is less than or equal to 0.03W / (m·K), the insulation effect is better, which is conducive to making the battery cell operate at a high temperature, and is conducive to improving the ionic conductivity of the solid electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0022] As an optional technical solution of an embodiment of the present application, the thermal insulation structure includes a second thermal insulation layer, and the second thermal insulation layer is arranged on a side of the wall portion away from the accommodating space.

[0023] In the above technical solution, the second heat insulation layer is arranged on the side of the wall away from the accommodating space, which is simpler and more convenient to manufacture, has a low manufacturing cost, and has a better heat insulation effect.

[0024] As an optional technical solution of an embodiment of the present application, the second insulation layer is a hollow insulation structure.

[0025] In the above technical solution, the second thermal insulation layer is a hollow thermal insulation structure. The second thermal insulation layer has a good thermal insulation effect and a small weight, which is beneficial to improving the energy density of the battery device.

[0026] As an optional technical solution of an embodiment of the present application, the second thermal insulation layer is made of a thermal insulation material.

[0027] In the above technical solution, the second thermal insulation layer is made of a thermal insulation material, and the thermal insulation effect of the second thermal insulation layer is better, which can further reduce the speed of heat transfer to the outside, delay heat loss, and enable the battery cell to operate in a high-temperature state, which is beneficial to improving the ionic conductivity of the solid electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0028] As an optional technical solution of an embodiment of the present application, the thermal conductivity of the second heat-insulating layer is less than or equal to 0.03 W / (m·K).

[0029] In the above technical solution, when the thermal conductivity of the second insulation layer is less than or equal to 0.03 W / (m·K), the thermal insulation effect of the second insulation layer is better, which is conducive to allowing the battery cell to operate at a high temperature, and is conducive to improving the ionic conductivity of the solid electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0030] As an optional technical solution of the embodiment of the present application, each of the wall portions is provided with the heat insulation structure.

[0031] In the above technical solution, by providing a thermal insulation structure on each wall, the thermal insulation structure is arranged around the battery cells, which can further reduce the rate of heat transfer outward, delay heat loss, and provide thermal insulation. This facilitates the operation of the battery cells at high temperatures, which is beneficial for improving the ionic conductivity of the solid electrolyte layer, reducing the internal resistance of the battery device, and increasing the energy density of the battery device.

[0032] As an optional technical solution of the embodiment of the present application, the battery device further includes a thermal management component, which is configured to adjust the temperature of the battery cell.

[0033] In the above technical solution, by providing a thermal management component, it is convenient to adjust the temperature of the battery cell so that the battery cell operates at a suitable temperature, thereby facilitating full performance of the battery cell.

[0034] As an optional technical solution of an embodiment of the present application, multiple wall portions include a first wall portion, the first wall portion is provided with the thermal insulation structure, the thermal management component is arranged between the first wall portion and the battery cell, and the thermal insulation structure arranged on the first wall portion is located on the side of the thermal management component away from the battery cell.

[0035] In the above technical solution, the thermal insulation structure arranged on the first wall is located on the side of the thermal management component away from the battery cell. In this way, the thermal management component can be closer to the battery cell, and the thermal insulation structure is not easily affected by the thermal management component, so that the thermal management component can better manage the temperature of the battery cell.

[0036] In a second aspect, an embodiment of the present application further provides an electrical device, which includes the above-mentioned battery device, and the battery device is used to provide electrical energy for the electrical device. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0038] Figure 1 A schematic structural diagram of a vehicle provided in some embodiments of the present application;

[0039] Figure 2 An exploded view of a battery device provided in some embodiments of the present application;

[0040] Figure 3 An exploded view of a battery cell provided in some embodiments of the present application;

[0041] Figure 4 A schematic diagram of the structure of an electrode assembly provided in some embodiments of the present application;

[0042] Figure 5 A cross-sectional view of a battery device provided in some embodiments of the present application;

[0043] Figure 6 Cross-sectional views of battery devices provided in some other embodiments of the present application;

[0044] Figure 7 Cross-sectional views of battery devices provided in some other embodiments of the present application;

[0045] Figure 8 A cross-sectional view of a battery device provided in some further embodiments of the present application;

[0046] Figure 9 A cross-sectional view of a battery device provided in some embodiments of the present application;

[0047] Figure 10 Cross-sectional views of battery devices provided in some other embodiments of the present application;

[0048] Figure 11 Cross-sectional views of battery devices provided in some other embodiments of the present application.

[0049] Icons: 10-housing; 11-first part; 12-second part; 13-wall; 131-accommodation space; 132-first wall; 20-battery cell; 21-outer shell; 211-shell; 212-end cover; 22-electrode assembly; 221-negative electrode plate; 222-solid electrolyte layer; 223-positive electrode plate; 30-thermal insulation structure; 31-first thermal insulation layer; 32-thermal insulation cavity; 321-thermal insulation medium; 33-second thermal insulation layer; 40-thermal management component; 100-battery device; 200-controller; 300-motor; 1000-vehicle. DETAILED DESCRIPTION

[0050] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application will be clearly described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0051] Unless otherwise defined, all technical and scientific terms used in this application have the same meanings as commonly understood by those skilled in the art to which this application belongs. The terms used in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application. The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. The terms "first" and "second" in the specification and claims of this application or the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order or a primary-secondary relationship.

[0052] References to "embodiments" in this application mean that a particular feature, structure, or characteristic described in connection with the embodiment may be included in at least one embodiment of the application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor does it constitute an independent or alternative embodiment that is mutually exclusive of other embodiments.

[0053] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connected," and "attached" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on specific circumstances.

[0054] The term "and / or" in this application simply describes an association between related objects, indicating that three possible relationships exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this application generally indicates that the related objects are in an "or" relationship.

[0055] In the embodiments of this application, the same reference numerals represent the same components, and for the sake of brevity, detailed descriptions of the same components in different embodiments are omitted. It should be understood that the thickness, length, width, and other dimensions of the various components in the embodiments of this application, as well as the overall thickness, length, width, and other dimensions of the integrated device shown in the drawings are merely illustrative and should not constitute any limitation on this application.

[0056] The term "plurality" used in this application refers to two or more (including two).

[0057] In the embodiment of the present application, the battery cell may be a secondary battery. A secondary battery refers to a battery cell that can be continuously used by activating active materials by charging after the battery cell is discharged.

[0058] A battery cell typically includes an electrode assembly. This assembly consists of a positive electrode, a negative electrode, and a separator. During the charge and discharge process, active ions are inserted and removed between the positive and negative electrodes. The separator, placed between the positive and negative electrodes, reduces the risk of short circuits while allowing the active ions to pass through.

[0059] In some embodiments, the positive electrode may be a positive electrode sheet, which may include a positive electrode current collector and a positive electrode active material disposed on at least one surface of the positive electrode current collector.

[0060] As an example, the positive electrode current collector has two surfaces facing each other in its thickness direction, and the positive electrode active material is provided on either or both of the two facing surfaces of the positive electrode current collector.

[0061] As an example, the positive electrode current collector may be a metal foil or a composite current collector. For example, as the metal foil, aluminum with a surface silver plating treatment, stainless steel with a surface silver plating treatment, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel or titanium, etc. may be used. The composite current collector may include a polymer material base layer and a metal layer. The composite current collector may be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0062] As an example, the positive electrode active material may include at least one of the following materials: lithium-containing phosphates, lithium transition metal oxides and their respective modified compounds. However, the present application is not limited to these materials, and other traditional materials that can be used as positive electrode active materials for battery cells may also be used. These positive electrode active materials may be used alone or in combination of two or more. Among them, examples of lithium-containing phosphates may include but are not limited to at least one of lithium iron phosphate (such as LiFePO4 (also referred to as LFP)), a composite material of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite material of lithium manganese phosphate and carbon, lithium iron manganese phosphate, and a composite material of lithium iron manganese phosphate and carbon. Examples of lithium transition metal oxides may include but are not limited to lithium cobalt oxide (such as LiCoO2), lithium nickel oxide (such as LiNiO2), lithium manganese oxide (such as LiMnO2, LiMn2O4), lithium nickel cobalt oxide, lithium manganese cobalt oxide, lithium nickel manganese oxide, lithium nickel cobalt manganese oxide (such as LiNi 1 / 3 Co 1 / 3Mn 1 / 3 O2 (also referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (also referred to as NCM 523), LiNi 0.5 Co 0.25 Mn 0.25 O2 (also referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (also referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (also referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2) and at least one of its modified compounds, etc.

[0063] In some embodiments, a positive electrode may utilize a metal foam. The metal foam may include nickel foam, copper foam, aluminum foam, alloy foam, or the like. When a metal foam is used as the positive electrode, the surface of the metal foam may or may not include a positive electrode active material. For example, a lithium source material, potassium metal, or sodium metal may be filled or / and deposited within the metal foam, where the lithium source material is lithium metal and / or a lithium-rich material.

[0064] In some embodiments, the negative electrode may be a negative electrode sheet, and the negative electrode sheet may include a negative electrode current collector.

[0065] As an example, the negative electrode current collector has two surfaces facing each other in its thickness direction, and the negative electrode active material is provided on either or both of the two facing surfaces of the negative electrode current collector.

[0066] As an example, the negative electrode active material may adopt the negative electrode active material for battery cells that is well known in the art. As an example, the negative electrode active material may include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, lithium titanate, etc. The silicon-based material may be selected from at least one of elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. The tin-based material may be selected from at least one of elemental tin, tin oxide compounds, and tin alloys. However, the present application is not limited to these materials, and other traditional materials that can be used as negative electrode active materials for battery cells may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0067] In some embodiments, the material of the positive electrode current collector may be aluminum, and the material of the negative electrode current collector may be copper.

[0068] In some embodiments, the separator is a solid electrolyte, which is disposed between the positive electrode and the negative electrode and serves to transport ions and isolate the positive and negative electrodes.

[0069] Among them, solid electrolytes include polymer solid electrolytes, inorganic solid electrolytes, and composite solid electrolytes.

[0070] As an example, the polymer solid electrolyte may be polyether (polyethylene oxide), polysiloxane, polycarbonate, polyacrylonitrile, polyvinylidene fluoride, polymethyl methacrylate, a single ion polymer, polyionic liquid-lithium salt, cellulose, or the like.

[0071] As an example, the inorganic solid electrolyte may include an oxide solid electrolyte (crystalline perovskite, sodium superconducting ion conductor, garnet, amorphous LiPON film), a sulfide solid electrolyte (crystalline lithium superion conductor (lithium germanium phosphosulfide, silver germanium sulfide), amorphous sulfide) and one or more of a halide solid electrolyte, a nitride solid electrolyte and a hydride solid electrolyte.

[0072] As an example, a composite solid electrolyte is formed by adding an inorganic solid electrolyte filler to a polymer solid electrolyte.

[0073] In some embodiments, the electrode assembly is a laminate structure.

[0074] As an example, multiple positive electrode sheets and multiple negative electrode sheets can be provided respectively, and the multiple positive electrode sheets and the multiple negative electrode sheets can be alternately stacked.

[0075] As an example, multiple separators may be provided, each of which is provided between any adjacent positive electrode sheets or negative electrode sheets.

[0076] In some embodiments, the electrode assembly is provided with tabs that can conduct current from the electrode assembly. The tabs include a positive tab and a negative tab.

[0077] In some embodiments, a battery cell may include a housing. The housing is used to encapsulate components such as the electrode assembly and the electrolyte. The housing may be a steel housing, an aluminum housing, a plastic housing (e.g., polypropylene), a composite metal housing (e.g., a copper-aluminum composite housing), or an aluminum-plastic film.

[0078] The battery apparatus mentioned in the embodiments of the present application may include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly may include multiple battery cells, which are connected in series, parallel, or hybrid via a busbar.

[0079] In some embodiments, a battery cell assembly is generally formed by arranging a plurality of battery cells. As an example, the battery cell assembly may be a battery module, which is formed by arranging and fixing a plurality of battery cells to form an independent module.

[0080] As an example, a battery module may be formed by bundling a plurality of battery cells by cable ties.

[0081] In some embodiments, the battery device may be a battery pack, which may include a case and one or more battery cell assemblies, wherein the battery cell assemblies are housed in the case.

[0082] As an example, the battery cell assembly may be a battery module, and the battery cell assembly may be accommodated in the box by fixing the battery module in the box.

[0083] As an example, the battery cell assembly may also be housed in the box by directly fixing the plurality of battery cells to the box.

[0084] For example, the housing may include a first portion and a second portion. The first and second portions engage to form an enclosed space within the housing to house the battery cell assembly. Enclosed here means covered or closed, and can be either sealed or unsealed. The first portion may be a top cover or a bottom plate.

[0085] As an example, the box body may include a top cover, a frame, and a bottom plate, wherein the top cover and the bottom plate are respectively connected to the frame, so that a closed space is formed inside the box body to accommodate the battery cell assembly.

[0086] As an example, the box body can be used as a part of the chassis structure of the vehicle. For example, the top cover of the box body can become at least a part of the floor of the vehicle, or the frame of the box body can become at least a part of the crossbeam and longitudinal beam of the vehicle.

[0087] In some embodiments, the battery device refers to an energy storage device, which includes a box with a door on at least one side. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0088] Batteries are widely used in new energy applications, such as electric vehicles and new energy vehicles. These have become a new trend in the automotive industry. The development of battery technology requires consideration of multiple design factors, including performance parameters such as discharge capacity and charge / discharge rate. Furthermore, the battery's energy density must be considered. However, current batteries have a relatively low energy density.

[0089] Solid-state batteries have the characteristics of high energy density. Using solid-state batteries in new energy vehicles will significantly improve the endurance of new energy vehicles. Traditional electrolyte batteries are prone to failure at high temperatures (≥50°C). In order to achieve good life and reliability, the batteries are equipped with a large number of heat dissipation components. However, since there is no electrolyte in solid-state batteries and the ionic conductivity of solid electrolytes is higher at high temperatures, high temperatures are more conducive to the performance of solid-state batteries. It is difficult to make solid-state batteries work at high temperatures in existing technologies, which makes the performance of solid-state batteries poor, resulting in low energy density of fixed batteries.

[0090] In view of this, an embodiment of the present application provides a battery device comprising a housing and a battery cell. The housing comprises multiple walls that collectively define a storage space within which the battery cell is stored. The battery cell comprises an electrode assembly, which comprises a positive electrode sheet, a solid electrolyte layer, and a negative electrode sheet. The solid electrolyte layer is disposed between the positive and negative electrode sheets. At least one of the walls is provided with a thermal insulation structure.

[0091] The battery device is equipped with a thermal insulation structure that reduces the rate of heat transfer, delays heat loss, and provides insulation. This allows the battery cells to operate at high temperatures, which helps improve the ionic conductivity of the solid electrolyte layer, reduce the internal resistance of the battery device, and increase the energy density of the battery device.

[0092] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries.

[0093] Electrically powered equipment may include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, and may include but are not limited to electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers.

[0094] For the convenience of description, the following embodiments are described by taking the electric device as a vehicle as an example.

[0095] Please refer to Figure 1 , Figure 1A schematic structural diagram of a vehicle 1000 provided for some embodiments of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended-range vehicle, etc. A battery device 100 is provided inside the vehicle 1000. The battery device 100 may be provided at the bottom, head or tail of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may serve as an operating power source for the vehicle 1000. The vehicle 1000 may further include a controller 200 and a motor 300. The controller 200 is used to control the battery device 100 to power the motor 300, for example, for starting, navigating and operating power requirements of the vehicle 1000 during driving.

[0096] In some embodiments of the present application, the battery device 100 can serve not only as an operating power source for the vehicle 1000 , but also as a driving power source for the vehicle 1000 , replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000 .

[0097] Please refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 , Figure 2 An exploded view of a battery device 100 provided in some embodiments of the present application. Figure 3 An exploded view of a battery cell 20 provided in some embodiments of the present application. Figure 4 This is a schematic structural diagram of the electrode assembly 22 provided in some embodiments of the present application. Figure 5 This is a cross-sectional view of a battery device 100 provided in some embodiments of the present application. Embodiments of the present application provide a battery device 100, comprising a housing 10 and a battery cell 20. The housing 10 comprises a plurality of walls 13, which together define a storage space 131, within which the battery cell 20 is stored. The battery cell 20 comprises an electrode assembly 22, which comprises a positive electrode sheet 223, a solid electrolyte layer 222, and a negative electrode sheet 221. The solid electrolyte layer 222 is disposed between the positive electrode sheet 223 and the negative electrode sheet 221. At least one of the walls 13 is provided with a thermal insulation structure 30.

[0098] The battery device 100 may include a housing 10 and a battery cell 20, with the battery cell 20 housed within the housing 10. The housing 10 is configured to provide a storage space 131 for the battery cell 20, and the housing 10 may have various structures. In some embodiments, the housing 10 may include a first portion 11 and a second portion 12, which overlap each other and together define a storage space 131 for accommodating the battery cell 20. The second portion 12 may be a hollow structure with one end open, and the first portion 11 may be a plate-like structure, overlapping the open side of the second portion 12, so that the first portion 11 and the second portion 12 together define the storage space 131. Alternatively, the first portion 11 and the second portion 12 may each be a hollow structure with one end open, with the open side of the first portion 11 overlapping the open side of the second portion 12. Of course, the housing 10 formed by the first portion 11 and the second portion 12 may have various shapes, such as a rectangular parallelepiped.

[0099] The box body 10 includes multiple walls 13 that collectively define a receiving space 131 for receiving the battery cells 20. When the box body 10 is a rectangular parallelepiped structure, the box body 10 includes six walls 13 that collectively define a receiving space 131 for receiving the battery cells 20.

[0100] In the battery device 100, there may be multiple battery cells 20, which may be connected in series, in parallel, or in a hybrid connection. A hybrid connection refers to a combination of series and parallel connections among the multiple battery cells 20. The multiple battery cells 20 may be directly connected in series, in parallel, or in a hybrid connection, and then the entire battery unit 20 may be housed within the housing 10. Alternatively, the battery device 100 may comprise multiple battery cells 20 connected in series, in parallel, or in a hybrid connection to form a battery module, which is then further connected in series, in parallel, or in a hybrid connection to form a single unit and housed within the housing 10. The battery device 100 may also include other structures, such as a busbar assembly for electrically connecting the multiple battery cells 20.

[0101] Each battery cell 20 may be a secondary battery cell or a primary battery cell. The battery cell 20 may be flat, rectangular, or in other shapes.

[0102] The battery cell 20 includes a housing 21 and an electrode assembly 22. The housing 21 includes a shell 211 and an end cap 212. The shell 211 has a receiving cavity with one end open for receiving the electrode assembly 22. The end cap 212 is connected to the shell 211 and closes the opening.

[0103] The end cap 212 refers to a component that covers the opening of the shell 211 to isolate the internal environment of the battery cell 20 from the external environment. Without limitation, the shape of the end cap 212 can be adapted to the shape of the shell 211 to match the shell 211. Optionally, the end cap 212 can be made of a material with a certain hardness and strength (such as aluminum alloy), so that the end cap 212 is not easily deformed when squeezed or collided, so that the battery cell 20 can have a higher structural strength and improved reliability. The material of the end cap 212 can include but is not limited to copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc. The battery cell 20 also includes an insulating member, which is arranged on the inner side of the end cap 212. The insulating member can be used to isolate the electrical connection components in the shell 211 from the end cap 212 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0104] The housing 211 is a component that cooperates with the end cap 212 to form the internal environment of the battery cell 20, wherein the formed internal environment can be used to accommodate the electrode assembly 22 and other components. The housing 211 and the end cap 212 can be independent components. An opening can be provided on the housing 211, and the end cap 212 is closed at the opening to form the internal environment of the battery cell 20. The end cap 212 and the housing 211 can also be integrated. Specifically, the end cap 212 and the housing 211 can form a common joint surface before other components are inserted into the housing. When the interior of the housing 211 needs to be encapsulated, the end cap 212 is closed to the housing 211. The housing 211 can be of various shapes and sizes, such as a rectangular parallelepiped, a hexagonal prism, etc. Specifically, the shape of the housing 211 can be determined according to the specific shape and size of the electrode assembly 22. The material of the housing 211 can include, but is not limited to, copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc.

[0105] The electrode assembly 22 is a component in the battery cell 20 where electrochemical reactions occur. One or more electrode assemblies 22 may be contained in the housing 211. The electrode assembly 22 is mainly formed by stacking a positive electrode sheet 223, a solid electrolyte layer 222, and a negative electrode sheet 221. The parts of the positive electrode sheet 223 and the negative electrode sheet 221 with active materials constitute the main body of the electrode assembly 22, and the parts of the positive electrode sheet 223 and the negative electrode sheet 221 without active materials each constitute a tab. The positive tab and the negative tab may be located together at one end of the main body or respectively at both ends of the main body. During the charge and discharge process of the battery cell 20, the positive electrode active material and the negative electrode active material react with the solid electrolyte layer 222.

[0106] The insulation structure 30 has poor heat conduction properties, meaning it has a low thermal conductivity. This structure can reduce the rate of heat transfer, slowing heat loss and providing insulation. The insulation structure 30 can be made of fiberglass, asbestos, rock wool, silicate, gel felt, vacuum panels, or the like.

[0107] The heat insulating structure 30 may be provided on one wall portion 13 of the box body 10, or on two walls 13 of the box body 10, or on three walls 13 of the box body 10, or on more walls 13 of the box body 10. For example, a heat insulating structure 30 may be provided on each wall portion 13.

[0108] The battery device 100 is provided with a thermal insulation structure 30, which reduces the rate of heat transfer, delays heat loss, and provides insulation. This facilitates the operation of the battery cells 20 at high temperatures, improves the ionic conductivity of the solid electrolyte layer 222, reduces the internal resistance of the battery device 100, and increases the energy density of the battery device 100.

[0109] Please refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 In some embodiments, the thermal insulation structure 30 includes a first thermal insulation layer 31 , and the first thermal insulation layer 31 is disposed on a side of the wall portion 13 facing the accommodating space 131 .

[0110] The first insulation layer 31 has poor heat conduction properties, meaning it has a low thermal conductivity. This layer can reduce the rate of heat transfer, slowing heat loss and providing insulation. The first insulation layer 31 can be made of fiberglass, asbestos, rock wool, silicate, gel felt, or vacuum panels.

[0111] The first thermal insulation layer 31 is disposed on the side of the wall portion 13 facing the accommodating space 131, that is, the first thermal insulation layer 31 is disposed on the inner side of the wall portion 13. The first thermal insulation layer 31 can be connected to the wall portion 13. In some embodiments, the first thermal insulation layer 31 is fixedly connected to the wall portion 13, for example, the first thermal insulation layer 31 is bonded to the wall portion 13. In other embodiments, the first thermal insulation layer 31 is detachably connected to the wall portion 13, for example, the first thermal insulation layer 31 is bolted to the wall portion 13. Of course, the first thermal insulation layer 31 does not need to be connected to the wall portion 13.

[0112] By positioning the first thermal insulation layer 31 on the side of the wall 13 facing the accommodation space 131, the wall 13 protects the first thermal insulation layer 31, making it less susceptible to damage and ensuring stable insulation. Furthermore, the first thermal insulation layer 31 is closer to the battery cells 20, making heat less likely to dissipate and providing better insulation.

[0113] Please refer to Figure 2 、 Figure 3 、 Figure 4 and Figure 5 In some embodiments, the first thermal insulation layer 31 is a hollow thermal insulation structure.

[0114] The first heat-insulating layer 31 forms a hollow cavity, and the hollow cavity may be a vacuum environment or may contain a gas heat-insulating medium 321 , such as air.

[0115] The first thermal insulation layer 31 is a hollow thermal insulation structure. The first thermal insulation layer 31 has a good thermal insulation effect and is light in weight, which is beneficial for improving the energy density of the battery device 100 .

[0116] Please refer to Figure 6 , Figure 6 The first heat-insulating layer 31 is made of a heat-insulating material.

[0117] The first heat insulating layer 31 may be a solid structure, for example, the first heat insulating layer 31 may be a plate structure. The first heat insulating layer 31 is made of a heat insulating material, thus having a good heat insulating effect.

[0118] The first thermal insulation layer 31 is made of a thermal insulation material. The first thermal insulation layer 31 has a better thermal insulation effect and can further reduce the speed of heat transfer to the outside, delaying heat dissipation, allowing the battery cell 20 to operate at a high temperature, which is beneficial to improving the ionic conductivity of the solid electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0119] In some embodiments, the thermal conductivity of the first thermal insulation layer 31 is less than or equal to 0.03 W / (m·K).

[0120] Thermal conductivity refers to the amount of heat transferred through an area of 1 square meter in 1 second when the temperature difference between the two surfaces of a 1-meter-thick material is 1 degree under stable heat transfer conditions.

[0121] The thermal conductivity of the first thermal insulation layer 31 can be: 0.03W / (m·K), 0.29W / (m·K), 0.28W / (m·K), 0.27W / (m·K), 0.26W / (m·K), 0.25W / (m·K), 0.24W / (m·K), etc.

[0122] The first heat insulating layer 31 may be made of asbestos, rock wool, vacuum board, etc.

[0123] When the thermal conductivity of the first thermal insulation layer 31 is less than or equal to 0.03 W / (m·K), the first thermal insulation layer 31 has a good thermal insulation effect, which is beneficial for the battery cell 20 to operate at a high temperature, and is beneficial for improving the ionic conductivity of the solid electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0124] Please refer to Figure 7 , Figure 7 1 is a cross-sectional view of a battery device 100 according to some other embodiments of the present application. In some other embodiments, the thermal insulation structure 30 includes a thermal insulation cavity 32 formed in the wall portion 13 .

[0125] Please refer to Figure 7 The wall portion 13 is a hollow heat-insulating structure. A heat-insulating cavity 32 is formed in the wall portion 13. The heat-insulating cavity 32 can be a vacuum environment or filled with a heat-insulating medium 321.

[0126] The heat insulation structure 30 includes a heat insulation cavity 32 formed in the wall portion 13 , which, on the one hand, has a good heat insulation effect. On the other hand, the heat insulation structure 30 does not occupy the internal space of the box body 10 , which is beneficial to improving the energy density of the battery cell 20 .

[0127] In some embodiments, the thermal insulation cavity 32 is in a vacuum environment.

[0128] The vacuum environment has good thermal insulation performance, which can reduce the speed of heat transfer to the outside, delay heat loss, and make the battery cell 20 operate at a high temperature, which is beneficial to improving the ionic conductivity of the solid electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0129] In other embodiments, the thermal insulation cavity 32 contains a thermal insulation medium 321 .

[0130] The heat insulating medium 321 may be a solid, such as asbestos, hard rubber, etc. The heat insulating medium 321 may also be a liquid, such as acetone, aniline, benzene, etc. The heat insulating medium 321 may also be a gas, such as air, water vapor, carbon dioxide, ethylene, etc.

[0131] By accommodating the heat insulating medium 321 in the heat insulating cavity 32 , the manufacturing process is simpler, which is beneficial to controlling the manufacturing cost and has a better heat insulating effect.

[0132] In some embodiments, the thermal conductivity of the thermal insulation medium 321 is less than or equal to 0.03 W / (m·K).

[0133] The thermal conductivity of the heat insulating medium 321 may be: 0.03 W / (m·K), 0.29 W / (m·K), 0.28 W / (m·K), 0.27 W / (m·K), 0.26 W / (m·K), 0.25 W / (m·K), 0.24 W / (m·K), etc.

[0134] The heat insulating medium 321 can be asbestos, hard rubber, acetone, aniline, benzene, air, water vapor, carbon dioxide, ethylene, etc.

[0135] When the thermal conductivity of the heat insulating medium 321 is less than or equal to 0.03 W / (m·K), the heat insulating effect is better, which is beneficial for the battery cell 20 to operate at a high temperature, and is beneficial for improving the ionic conductivity of the solid electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0136] Please refer to Figure 9 , Figure 9 1 is a cross-sectional view of a battery device 100 provided in some other embodiments of the present application. In some other embodiments, the heat insulation structure 30 includes a second heat insulation layer 33 , which is disposed on a side of the wall portion 13 facing away from the accommodating space 131 .

[0137] The second insulation layer 33 has poor heat conduction properties, meaning it has a low thermal conductivity. This layer can reduce the rate of heat transfer, slowing heat loss and providing insulation. The second insulation layer 33 can be made of fiberglass, asbestos, rock wool, silicate, gel felt, or a vacuum panel.

[0138] The second thermal insulation layer 33 is disposed on the side of the wall portion 13 facing away from the accommodation space 131, that is, the second thermal insulation layer 33 is disposed on the outside of the wall portion 13. The second thermal insulation layer 33 can be connected to the wall portion 13. In some embodiments, the first thermal insulation layer 31 is fixedly connected to the wall portion 13, for example, the first thermal insulation layer 31 is bonded to the wall portion 13. In other embodiments, the first thermal insulation layer 31 is detachably connected to the wall portion 13, for example, the first thermal insulation layer 31 is bolted to the wall portion 13.

[0139] The second heat-insulating layer 33 is disposed on a side of the wall portion 13 away from the accommodating space 131 , which is simpler and more convenient to manufacture, has a low manufacturing cost, and has a better heat-insulating effect.

[0140] Please refer to Figure 9 In some embodiments, the second thermal insulation layer 33 is a hollow thermal insulation structure.

[0141] The second heat-insulating layer 33 is formed with a hollow cavity, and the hollow cavity may be a vacuum environment or may contain a gas heat-insulating medium 321 , such as air.

[0142] The second thermal insulation layer 33 is a hollow thermal insulation structure. The second thermal insulation layer 33 has a good thermal insulation effect and is light in weight, which is beneficial for improving the energy density of the battery device 100 .

[0143] Please refer to Figure 10 , Figure 10 1 is a cross-sectional view of a battery device 100 provided in some other embodiments of the present application. In some other embodiments, the second thermal insulation layer 33 is made of a thermal insulation material.

[0144] The second heat-insulating layer 33 may be a solid structure, for example, the second heat-insulating layer 33 may be a plate structure. The second heat-insulating layer 33 is made of a heat-insulating material, thus having a good heat-insulating effect.

[0145] The second thermal insulation layer 33 is made of a thermal insulation material. The second thermal insulation layer 33 has a better thermal insulation effect and can further reduce the speed of heat transfer to the outside, delaying heat dissipation, allowing the battery cell 20 to operate at a high temperature, which is beneficial to improving the ionic conductivity of the solid electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0146] In some embodiments, the thermal conductivity of the second insulation layer 33 is less than or equal to 0.03 W / (m·K).

[0147] The thermal conductivity of the second insulation layer 33 can be: 0.03W / (m·K), 0.29W / (m·K), 0.28W / (m·K), 0.27W / (m·K), 0.26W / (m·K), 0.25W / (m·K), 0.24W / (m·K), etc.

[0148] The second heat insulation layer 33 may be made of asbestos, rock wool, vacuum board, etc.

[0149] When the thermal conductivity of the second thermal insulation layer 33 is less than or equal to 0.03 W / (m·K), the second thermal insulation layer 33 has a good thermal insulation effect, which is beneficial for the battery cell 20 to operate at a high temperature, and is beneficial for improving the ionic conductivity of the solid electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0150] Please refer to Figure 10 In some embodiments, each wall portion 13 is provided with a heat insulation structure 30 .

[0151] “Each wall portion 13 is provided with a heat insulation structure 30 ” means that all the wall portions 13 of the box body 10 are provided with a heat insulation structure 30 .

[0152] By providing a thermal insulation structure 30 on each wall portion 13 and surrounding the battery cells 20, the thermal insulation structure 30 can further reduce the rate of heat transfer outward, delay heat loss, and provide thermal insulation. This facilitates the operation of the battery cells 20 at high temperatures, which helps improve the ionic conductivity of the solid electrolyte layer 222, reduce the internal resistance of the battery device 100, and increase the energy density of the battery device 100.

[0153] Please refer to Figure 11 , Figure 11 The cross-sectional view of the battery device 100 is provided in some other embodiments of the present application. In some other embodiments, the battery device 100 further includes a thermal management component 40 , which is configured to regulate the temperature of the battery cell 20 .

[0154] The thermal management component 40 is used to control the temperature of the battery cells 20 within a preset range. The thermal management component 40 can be used to cool or heat the battery cells 20. The thermal management component 40 can be in contact with the battery cells 20, exchanging heat with them through heat conduction. For example, the thermal management component 40 can be a direct cooling plate, with the outer surface of the thermal management component 40 in contact with the outer surface of the battery cells 20. The thermal management component 40 can also be spaced apart from the workpiece, exchanging heat with the workpiece through convection or radiation.

[0155] The thermal management component 40 includes a medium inlet and a medium outlet. The medium inlet is used for allowing heat exchange medium to flow into the thermal management component 40 , and the medium outlet is used for allowing heat exchange medium to flow out of the thermal management component 40 .

[0156] The heat exchange medium can be water, or it can be Freon, tetrafluoroethane, trifluoromethane, etc.

[0157] By providing the thermal management component 40 , the temperature of the battery cell 20 can be easily adjusted, so that the battery cell 20 operates at a suitable temperature, thereby facilitating full performance of the battery cell 20 .

[0158] Please refer to Figure 11 In some embodiments, the plurality of walls 13 include a first wall 132, the first wall 132 being provided with a thermal insulation structure 30, and the thermal management component 40 being provided between the first wall 132 and the battery cell 20. The thermal insulation structure 30 provided on the first wall 132 is located on a side of the thermal management component 40 facing away from the battery cell 20.

[0159] The thermal management component 40 is disposed between the first wall portion 132 and the battery cell 20, and the thermal insulation structure 30 disposed on the first wall portion 132 is located on the side of the thermal management component 40 facing away from the battery cell 20. In other words, the thermal management component 40 is closer to the battery cell 20 than the thermal insulation structure 30 disposed on the first wall portion 132, thereby facilitating thermal management of the battery cell 20 without being obstructed by the thermal insulation structure 30.

[0160] The thermal insulation structure 30 provided on the first wall portion 132 is located on the side of the thermal management component 40 away from the battery cell 20. In this way, the thermal management component 40 can be closer to the battery cell 20, and the thermal insulation structure 30 is not likely to affect the thermal management component 40, so that the thermal management component 40 can better manage the temperature of the battery cell 20.

[0161] An embodiment of the present application further provides an electrical device, which includes the above-mentioned battery device 100, and the battery device 100 is used to provide electrical energy to the electrical device.

[0162] According to some embodiments of this application, please refer to Figures 5 to 11 .

[0163] The embodiment of the present application provides a battery device 100, which includes a housing 10 and a battery cell 20. The housing 10 includes a plurality of walls 13, which together define a storage space 131. The battery cell 20 is stored in the storage space 131. The battery cell 20 includes an electrode assembly 22, which includes a positive electrode sheet 223, a solid electrolyte layer 222, and a negative electrode sheet 221. The solid electrolyte layer 222 is disposed between the positive electrode sheet 223 and the negative electrode sheet 221. At least one of the walls 13 is provided with a thermal insulation structure 30. The battery device 100 is provided with a thermal insulation structure 30, which can reduce the rate of heat transfer outward, delay heat loss, and provide insulation. This facilitates the operation of the battery cell 20 at a high temperature, which is beneficial for improving the ionic conductivity of the solid electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0164] The thermal insulation structure 30 includes a first insulation layer 31, which is disposed on the side of the wall 13 facing the storage space 131. This placement of the first insulation layer 31 on the side of the wall 13 facing the storage space 131 protects the first insulation layer 31 from damage, ensuring stable insulation. Furthermore, the proximity of the first insulation layer 31 to the battery cells 20 reduces heat dissipation and enhances insulation performance.

[0165] The first insulation layer 31 is a hollow insulation structure. The first insulation layer 31 has a good insulation effect and a small weight, which is beneficial to improving the energy density of the battery device 100.

[0166] Each wall portion 13 is provided with a thermal insulation structure 30. By providing a thermal insulation structure 30 on each wall portion 13 and surrounding the battery cells 20, the thermal insulation structure 30 can further reduce the rate of heat transfer outward, delay heat dissipation, and provide insulation. This facilitates the operation of the battery cells 20 at high temperatures, which helps improve the ionic conductivity of the solid electrolyte layer 222, reduce the internal resistance of the battery device 100, and increase the energy density of the battery device 100.

[0167] The battery device 100 also includes a thermal management component 40 configured to regulate the temperature of the battery cells 20. The plurality of walls 13 include a first wall 132, which is provided with a thermal insulation structure 30. The thermal management component 40 is disposed between the first wall 132 and the battery cells 20, with the thermal insulation structure 30 disposed on the first wall 132 located on the side of the thermal management component 40 facing away from the battery cells 20. This position of the thermal insulation structure 30 on the first wall 132 brings the thermal management component 40 closer to the battery cells 20, making it less likely for the thermal insulation structure 30 to affect the thermal management component 40, allowing the thermal management component 40 to better manage the temperature of the battery cells 20.

[0168] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A battery device, characterized in that: include: The box body includes a plurality of wall portions, wherein the plurality of wall portions together define a receiving space; A battery cell is accommodated in the accommodation space, wherein the battery cell includes an electrode assembly, the electrode assembly includes a positive electrode sheet, a solid electrolyte layer and a negative electrode sheet, and the solid electrolyte layer is provided between the positive electrode sheet and the negative electrode sheet; Wherein, at least one of the wall portions is provided with a heat insulation structure.

2. The battery device according to claim 1, wherein: The heat insulation structure includes a first heat insulation layer, which is arranged on a side of the wall portion facing the accommodating space.

3. The battery device according to claim 2, characterized in that: The first heat insulation layer is a hollow heat insulation structure.

4. The battery device according to claim 2, characterized in that: The first heat-insulating layer is made of a heat-insulating material.

5. The battery device according to claim 2, characterized in that: The thermal conductivity of the first heat-insulating layer is less than or equal to 0.03 W / (m·K).

6. The battery device according to claim 1, characterized in that: The thermal insulation structure includes a thermal insulation cavity formed in the wall portion.

7. The battery device according to claim 6, characterized in that: The heat-insulating cavity is in a vacuum environment.

8. The battery device according to claim 6, characterized in that: The heat insulation cavity contains a heat insulation medium.

9. The battery device according to claim 8, characterized in that: The thermal conductivity of the thermal insulation medium is less than or equal to 0.03 W / (m·K).

10. The battery device according to claim 1, characterized in that: The heat insulation structure includes a second heat insulation layer, which is arranged on a side of the wall portion facing away from the accommodating space.

11. The battery device according to claim 10, characterized in that: The second heat insulation layer is a hollow heat insulation structure.

12. The battery device according to claim 10, characterized in that: The second heat-insulating layer is made of a heat-insulating material.

13. The battery device according to claim 10, characterized in that: The thermal conductivity of the second heat-insulating layer is less than or equal to 0.03 W / (m·K).

14. The battery device according to any one of claims 1 to 13, characterized in that: Each of the wall portions is provided with the heat insulation structure.

15. The battery device according to any one of claims 1 to 13, characterized in that: The battery device also includes a thermal management component configured to regulate a temperature of the battery cells.

16. The battery device according to claim 15, characterized in that: The multiple walls include a first wall, the first wall is provided with the heat insulation structure, the heat management component is provided between the first wall and the battery cell, and the heat insulation structure provided on the first wall is located on the side of the heat management component away from the battery cell.

17. An electrical device, characterized in that: The battery device comprises a battery device according to any one of claims 1 to 16, wherein the battery device is used to provide electrical energy to the electrical device.

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