Battery apparatus and electric apparatus

Abstract

The present application relates to the field of batteries, and provides a battery apparatus and an electric apparatus. The battery apparatus comprises a casing and a battery cell, wherein the casing comprises a plurality of wall portions, the plurality of wall portions together define an accommodating space, and the battery cell is accommodated in the accommodating space. 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 provided between the positive electrode sheet and the negative electrode sheet. At least one wall portion is provided with a heat insulation structure. The battery apparatus is provided with a heat insulation structure capable of reducing a rate of outward heat transfer, slowing down heat dissipation, and playing a role in conserving heat. This allows for the battery cell to operate at a high temperature, which helps to improve ionic conductivity in the solid electrolyte layer, reduce internal resistance in the battery apparatus, and increase energy density of the battery apparatus.

Description

Battery device and electric device Cross-reference to related applications

[0001] This application claims priority to Chinese Patent Application (Application No. 2024222537713) filed on September 13, 2024, entitled "Battery device and electric device", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD

[0002] The present application relates to the field of batteries, in particular, to a battery device and an electric device. BACKGROUND

[0003] Batteries are widely used in the field of new energy, such as electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. The development of battery technology needs to consider various design factors, such as discharge capacity, charge-discharge rate, and other performance parameters. In addition, the energy density of the battery also needs to be considered. However, the energy density of the current battery is relatively small. SUMMARY

[0004] The purpose of the embodiments of the present application is to provide a battery device and an electric device, which aims to improve the problem of small energy density of the battery in the related art.

[0005] In a first aspect, the embodiments of the present application provide a battery device, which comprises a box body and a battery monomer. The box body comprises a plurality of wall portions, and the plurality of wall portions jointly define an accommodation space. The battery monomer is accommodated in the accommodation space, and the battery monomer comprises an electrode assembly, the electrode assembly comprises a positive electrode sheet, a solid-state electrolyte layer and a negative electrode sheet, and the solid-state electrolyte layer is arranged between the positive electrode sheet and the negative electrode sheet. At least one of the wall portions is provided with a heat insulation structure.

[0006] In the above technical solution, the battery device is provided with a heat insulation structure, which can reduce the speed of heat transfer outward, delay heat dissipation, and play a heat preservation role. In this way, it is convenient to make the battery monomer work in a high temperature state, which is beneficial to improve the ionic conductivity of the solid-state electrolyte layer, reduce the internal resistance of the battery device, and improve the energy density of the battery device.

[0007] As an optional technical solution of the embodiments of the present application, the heat insulation structure comprises a first heat insulation layer, and the first heat insulation layer is arranged on the side of the wall portion facing the accommodation space.

[0008] In the technical scheme, the first heat insulation layer is arranged on the side of the wall part facing the containing space, so that the wall part can protect the first heat insulation layer, the first heat insulation layer is less likely to be damaged, and the heat insulation effect of the first heat insulation layer can be stably achieved. In addition, the first heat insulation layer is closer to the battery monomer, heat is less likely to be dissipated, and the heat insulation effect is better.

[0009] As an optional technical scheme of the embodiment, the first heat insulation layer is a hollow heat insulation structure.

[0010] In the technical scheme, the first heat insulation layer is a hollow heat insulation structure, the heat insulation effect of the first heat insulation layer is better, and the weight of the first heat insulation layer is smaller, which is beneficial to improve the energy density of the battery device.

[0011] As an optional technical scheme of the embodiment, the first heat insulation layer is made of a heat insulation material.

[0012] In the technical scheme, the first heat insulation layer is made of a heat insulation material, so that the heat insulation effect of the first heat insulation layer is better, the speed of heat transfer to the outside is reduced, heat dissipation is delayed, the battery monomer can work in a high-temperature state, the ionic conductivity of the solid-state electrolyte layer is improved, the internal resistance of the battery device is reduced, and the energy density of the battery device is improved.

[0013] As an optional technical scheme of the embodiment, the thermal conductivity of the first heat insulation layer is less than or equal to 0.03 W / (m·K).

[0014] In the technical scheme, when the thermal conductivity of the first heat insulation layer is less than or equal to 0.03 W / (m·K), the heat insulation effect of the first heat insulation layer is better, which is beneficial to make the battery monomer work in a high-temperature state, improve the ionic conductivity of the solid-state electrolyte layer, reduce the internal resistance of the battery device, and improve the energy density of the battery device.

[0015] As an optional technical scheme of the embodiment, the heat insulation structure includes a heat insulation cavity formed in the wall part.

[0016] In the technical scheme, the heat insulation structure includes a heat insulation cavity formed in the wall part, which has a better heat insulation effect. In addition, the heat insulation structure does not occupy the internal space of the box, which is beneficial to improve the energy density of the battery monomer.

[0017] As an optional technical scheme of the embodiment, the heat insulation cavity is a vacuum environment.

[0018] In the technical scheme, the vacuum environment has good heat insulation performance, can reduce the speed of heat transfer to the outside, delay heat dissipation, make the battery monomer work in a high temperature state, be 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.

[0019] As an optional technical scheme of the embodiment, the heat insulation cavity contains a heat insulation medium.

[0020] In the technical scheme, the heat insulation medium is contained in the heat insulation cavity, which is simple to manufacture, beneficial to controlling the manufacturing cost, and has good heat insulation effect.

[0021] As an optional technical scheme of the embodiment, the heat conductivity coefficient of the heat insulation medium is less than or equal to 0.03 W / (m·K).

[0022] In the technical scheme, when the heat conductivity coefficient of the heat insulation medium is less than or equal to 0.03 W / (m·K), the heat insulation effect is good, which is beneficial to making the battery monomer work in a high temperature state, 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.

[0023] As an optional technical scheme of the embodiment, the heat insulation structure includes a second heat insulation layer, and the second heat insulation layer is arranged on the side of the wall away from the containing space.

[0024] In the technical scheme, the second heat insulation layer is arranged on the side of the wall away from the containing space, which is simple and convenient to manufacture, has low manufacturing cost, and has good heat insulation effect.

[0025] As an optional technical scheme of the embodiment, the second heat insulation layer is a hollow heat insulation structure.

[0026] In the technical scheme, the second heat insulation layer is a hollow heat insulation structure, the heat insulation effect of the second heat insulation layer is good, and the weight of the second heat insulation layer is small, which is beneficial to improving the energy density of the battery device.

[0027] As an optional technical scheme of the embodiment, the second heat insulation layer is made of a heat insulation material.

[0028] In the technical scheme, the second heat insulation layer is made of a heat insulation material, so the heat insulation effect of the second heat insulation layer is good, which can further reduce the speed of heat transfer to the outside, delay heat dissipation, make the battery monomer work in a high temperature state, be 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.

[0029] As an optional technical solution of the embodiment of the present application, the second thermal insulation layer has a thermal conductivity less than or equal to 0.03 W / (m·K).

[0030] In the above technical solution, when the second thermal insulation layer has a thermal conductivity less than or equal to 0.03 W / (m·K), the second thermal insulation layer has a better thermal insulation effect, which is conducive to making the battery monomer work in a high-temperature state, and is conducive to improving the ionic conductivity of the solid-state electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0031] As an optional technical solution of the embodiment of the present application, each wall portion is provided with the thermal insulation structure.

[0032] In the above technical solution, by providing the thermal insulation structure on each wall portion, the thermal insulation structure is arranged around the battery monomer, which can further reduce the speed of heat transfer outward, delay heat dissipation, and play a heat preservation role. In this way, it is convenient to make the battery monomer work in a high-temperature state, which is conducive to improving the ionic conductivity of the solid-state electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0033] As an optional technical solution of the embodiment of the present application, the battery device further comprises a thermal management component configured to adjust the temperature of the battery monomer.

[0034] In the above technical solution, by providing the thermal management component, the temperature of the battery monomer can be adjusted so that the battery monomer works at a suitable temperature, thereby facilitating the full performance of the battery monomer.

[0035] As an optional technical solution of the embodiment of the present application, the plurality of wall portions comprises 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 monomer, and the thermal insulation structure of the first wall portion is located on a side of the thermal management component away from the battery monomer.

[0036] In the above technical solution, the thermal insulation structure of the first wall portion is located on a side of the thermal management component away from the battery monomer, so that the thermal management component can be closer to the battery monomer, and the thermal insulation structure does not easily affect the thermal management component, so that the thermal management component can better manage the temperature of the battery monomer.

[0037] In a second aspect, the embodiment of the present application also provides a power utilization device, which comprises the above-mentioned battery device, and the battery device is used to provide electric energy for the power utilization device. BRIEF DESCRIPTION OF DRAWINGS

[0038] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some of the embodiments of the present application, and therefore should not be regarded as a limitation to the scope. Other related drawings can also be obtained by those of ordinary skill in the art without any creative effort, on the premise of not paying any creative effort.

[0039] Fig. 1 is a structural schematic diagram of a vehicle provided by some embodiments of the present application;

[0040] Fig. 2 is an exploded view of a battery device provided by some embodiments of the present application;

[0041] Fig. 3 is an exploded view of a battery cell provided by some embodiments of the present application;

[0042] Fig. 4 is a structural schematic diagram of an electrode assembly provided by some embodiments of the present application;

[0043] Fig. 5 is a sectional view of a battery device provided by some embodiments of the present application;

[0044] Fig. 6 is a sectional view of a battery device provided by some other embodiments of the present application;

[0045] Fig. 7 is a sectional view of a battery device provided by some other embodiments of the present application;

[0046] Fig. 8 is a sectional view of a battery device provided by some other embodiments of the present application;

[0047] Fig. 9 is a sectional view of a battery device provided by some other embodiments of the present application;

[0048] Fig. 10 is a sectional view of a battery device provided by some other embodiments of the present application;

[0049] Fig. 11 is a sectional view of a battery device provided by some other embodiments of the present application.

[0050] Fig. 11 is a sectional view of a battery device provided by some other embodiments of the present application. DETAILED DESCRIPTION

[0051] In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0052] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the present application are only for the purpose of describing the specific embodiments of the present application and are not intended to limit the present application; the terms "include" and "have" and any variations thereof in the specification and claims of the present application and the above description of drawings are intended to cover non-exclusive inclusion. The terms "first", "second" and the like in the specification and claims of the present application or the above description of drawings are used to distinguish different objects, and are not intended to describe a particular order or primary and secondary relationship.

[0053] In the present application, the phrase "embodiment" means that the specific features, structures or properties described in connection with the embodiment can be included in at least one embodiment of the present application. The phrase appears at various places in the specification does not necessarily refer to the same embodiment, nor is it mutually exclusive or alternative to other embodiments.

[0054] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mount", "connect", "connection", "attach" should be understood broadly, for example, it can be fixed connection, or detachable connection, or integrally connected; it can be directly connected, or indirectly connected through an intermediate medium, or the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0055] In the present application, the term "and / or" is only a description of the association relationship between the associated objects, which means that there can be three kinds of relationships, for example, A and / or B can represent the existence of A alone, the existence of A and B together, and the existence of B alone. In addition, the character " / " in the present application generally represents an "or" relationship between the front and rear associated objects.

[0056] In the embodiments of the present application, the same reference signs represent the same parts, and for the sake of brevity, detailed description of the same parts is omitted in different embodiments. It should be understood that the thickness, length and width of various components in the embodiments of the present application shown in the drawings, and the overall thickness, length and width of the integrated device are only exemplary and should not constitute any limitation on the present application.

[0057] As used herein, "a plurality of" means two or more (including two).

[0058] In embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be used continuously by activating the active material through charging after discharging the battery cell.

[0059] The battery cell generally includes an electrode assembly. The electrode assembly includes a cathode, an anode, and a separator. During charging and discharging of the battery cell, active ions are inserted and extracted between the cathode and the anode. The separator is disposed between the cathode and the anode, and can reduce the risk of short circuiting between the cathode and the anode, while allowing the active ions to pass through.

[0060] In some embodiments, the cathode can be a cathode tab, which can include a cathode current collector and a cathode active material disposed on at least one surface of the cathode current collector.

[0061] As an example, the cathode current collector has two surfaces opposite in the thickness direction thereof, and the cathode active material is disposed on either one or both of the two opposite surfaces of the cathode current collector.

[0062] As an example, the cathode current collector can be a metal foil or a composite current collector. For example, as a metal foil, aluminum with silver plating on the surface, stainless steel with silver plating on the surface, stainless steel, copper, aluminum, nickel, a carbon electrode, carbon, nickel, or titanium, etc. can be used. The composite current collector can include a polymer material base layer and a metal layer. The composite current collector can 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 base material (such as a base material of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0063] As an example, the positive electrode active material can include at least one of a lithium-containing phosphate, a lithium transition metal oxide, and a modified compound of each thereof. However, the present application is not limited to these materials, and other conventional materials that can be used as a positive electrode active material of a battery cell can also be used. These positive electrode active materials can be used alone only one or two or more of them can be used in combination. Among them, examples of the lithium-containing phosphate can include, but are not limited to, at least one of lithium iron phosphate (such as LiFePO4 (which can also be referred to as LFP)), a composite of lithium iron phosphate and carbon, lithium manganese phosphate (such as LiMnPO4), a composite of lithium manganese phosphate and carbon, lithium manganese iron phosphate, and a composite of lithium manganese iron phosphate and carbon. Examples of the lithium transition metal oxide can include, but are not limited to, at least one of 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 / 3 Mn 1 / 3 O2 (which can also be referred to as NCM 333 ), LiNi 0.5 Co 0.2 Mn 0.3 O2 (which can also be referred to as NCM 523 ), LiNi 0.5 Co 0.25 Mn 0.25 O2 (which can also be referred to as NCM 211 ), LiNi 0.6 Co 0.2 Mn 0.2 O2 (which can also be referred to as NCM 622 ), LiNi 0.8 Co 0.1 Mn 0.1 O2 (which can also be referred to as NCM 811 ), lithium nickel cobalt aluminum oxide (such as LiNi 0.85 Co 0.15 Al 0.05 O2), and modified compounds thereof.

[0064] In some embodiments, the positive electrode can employ a foam metal. The foam metal can be a foam nickel, a foam copper, a foam aluminum, a foam alloy, or the like. When the foam metal is used as the positive electrode, the surface of the foam metal can not be provided with the positive electrode active material, or of course can be provided with the positive electrode active material. As an example, the foam metal can also be filled or / and deposited with a lithium source material, a potassium metal, or a sodium metal, the lithium source material being a lithium metal and / or a lithium-rich material.

[0065] In some embodiments, the negative electrode can be a negative electrode tab, and the negative electrode tab can include a negative electrode current collector.

[0066] As an example, the negative current collector has two surfaces opposite in the thickness direction thereof, and the negative active material is provided on either one or both of the two surfaces of the negative current collector.

[0067] As an example, the negative active material can employ a negative active material for a battery cell known in the art. As an example, the negative active material can include at least one of artificial graphite, natural graphite, soft carbon, hard carbon, a silicon-based material, a tin-based material, and lithium titanate, etc. The silicon-based material can be selected from at least one of elemental silicon, a silicon oxide compound, a silicon-carbon composite, a silicon-nitrogen composite, and a silicon alloy. The tin-based material can be selected from at least one of elemental tin, a tin oxide compound, and a tin alloy. However, the present application is not limited to these materials, and other conventional materials that can be used as a negative active material for a battery cell can also be used. These negative active materials can be used alone or in combination of two or more.

[0068] In some embodiments, the material of the positive current collector can be aluminum, and the material of the negative current collector can be copper.

[0069] In some embodiments, the separator is a solid-state electrolyte. The solid-state electrolyte is disposed between the positive electrode and the negative electrode, and functions to transport ions and separate the positive electrode and the negative electrode.

[0070] The solid-state electrolyte includes a polymer solid-state electrolyte, an inorganic solid-state electrolyte, and a composite solid-state electrolyte.

[0071] As an example, the polymer solid-state electrolyte can be a polyether (polyethylene oxide), a polysiloxane, a polycarbonate, a polyacrylonitrile, a polyvinylidene fluoride, a polymethyl methacrylate, a single-ion polymer, a polyionic liquid-lithium salt, cellulose, etc.

[0072] As an example, the inorganic solid-state electrolyte can include one or more of an oxide solid-state electrolyte (crystalline perovskite, sodium superionic conductor, garnet, amorphous LiPON thin film), a sulfide solid-state electrolyte (crystalline lithium superionic conductor (lithium germanium phosphorous sulfide, argyrodite), amorphous sulfide), a halide solid-state electrolyte, a nitride solid-state electrolyte, and a hydride solid-state electrolyte.

[0073] As an example, the composite solid-state electrolyte is formed by adding an inorganic solid-state electrolyte filler to a polymer solid-state electrolyte.

[0074] In some embodiments, the electrode assembly is a stacked structure.

[0075] As an example, a plurality of positive electrode tabs and a plurality of negative electrode tabs can be alternately stacked.

[0076] As an example, the separators can be provided in plurality, each provided between any adjacent positive electrode tab or negative electrode tab.

[0077] In some embodiments, the electrode assembly is provided with tabs, which can conduct current out of the electrode assembly. The tabs include positive tabs and negative tabs.

[0078] In some embodiments, the battery cell can include a housing. The housing is used to encapsulate components such as the electrode assembly and electrolyte. The housing can be a steel case, an aluminum case, a plastic case (such as polypropylene), a composite metal case (such as a copper-aluminum composite case), or an aluminum-plastic film, etc.

[0079] The battery apparatus mentioned in the embodiments of the present application can include one or more battery cell assemblies for providing voltage and capacity. The battery cell assembly can include a plurality of battery cells connected in series, in parallel, or in a mixed connection through a busbar component.

[0080] In some embodiments, the battery cell assembly is generally formed by arranging a plurality of battery cells; as an example, the battery cell assembly can be a battery module, which is formed by arranging and fixing a plurality of battery cells into an independent module.

[0081] As an example, the battery module can be formed by bundling a plurality of battery cells with a cable tie.

[0082] In some embodiments, the battery apparatus can be a battery pack, which can include a box and one or more battery cell assemblies housed in the box.

[0083] As an example, the battery cell assembly can be a battery module, which can be housed in the box by fixing the battery module in the box.

[0084] As an example, the battery cell assembly can also be housed in the box by directly fixing a plurality of battery cells in the box.

[0085] As an example, the box can include a first part and a second part. The first part and the second part are buckled so that a closed space is formed inside the box to accommodate the battery cell assembly. Here, closed means covered or closed, which can be sealed or unsealed. The first part can be a top cover or a bottom plate.

[0086] As an example, the box can include a top cover, a frame, and a bottom plate. The top cover and the bottom plate are respectively connected with the frame, so that a closed space is formed inside the box to accommodate the battery cell assembly.

[0087] As an example, the box can be part of a chassis structure of a vehicle. For example, the top cover of the box can become at least part of the floor of the vehicle, or the frame of the box can become at least part of the cross beam and the longitudinal beam of the vehicle.

[0088] In some embodiments, the battery device refers to an energy storage device, and the energy storage device includes a box, at least one side of the box is provided with a door. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0089] Batteries are widely used in the new energy field, such as electric vehicles, new energy vehicles, etc. New energy vehicles and electric vehicles have become a new trend in the development of the automotive industry. The development of battery technology needs to consider many design factors, such as discharge capacity, charge-discharge rate, and other performance parameters. In addition, the energy density of the battery also needs to be considered. However, the energy density of the current battery is small.

[0090] 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℃). To achieve good life and reliability, the battery is equipped with a large number of heat dissipation components. Since solid-state batteries do not have electrolyte, and the ionic conductivity of solid-state electrolyte is higher at high temperatures, high temperature is more conducive to the performance of solid-state batteries. It is difficult to make solid-state batteries work at high temperatures in the prior art, which makes the performance of solid-state batteries poor, resulting in low energy density of solid-state batteries.

[0091] Therefore, the embodiments of the present application provide a battery device. The battery device includes a box and a battery monomer. The box includes a plurality of wall parts, and the plurality of wall parts collectively define an accommodation space. The battery monomer is accommodated in the accommodation space. The battery monomer includes an electrode assembly, the electrode assembly includes a positive electrode sheet, a solid-state electrolyte layer and a negative electrode sheet, and the solid-state electrolyte layer is arranged between the positive electrode sheet and the negative electrode sheet. At least one wall part is provided with a heat insulation structure.

[0092] The battery device is provided with a heat insulation structure, which can reduce the speed of heat transfer to the outside, delay heat dissipation, and play a heat preservation role. In this way, it is convenient to make the battery monomer work at high temperature, which is conducive to improving the ionic conductivity of the solid-state electrolyte layer, reducing the internal resistance of the battery device, and improving the energy density of the battery device.

[0093] The technical solutions described in the embodiments of the present application are applicable to batteries and electric equipment using batteries.

[0094] The electric device can be a vehicle, a mobile phone, a portable device, a notebook computer, a ship, a spacecraft, an electric toy, and an electric tool, etc. The spacecraft includes an airplane, a rocket, a space shuttle, a spacecraft, etc. The electric toy includes a fixed or mobile electric toy, such as a game machine, an electric car toy, an electric ship toy, and an electric airplane toy, etc. The electric tool includes a metal cutting electric tool, a grinding electric tool, an assembling electric tool, and a railway electric tool, which can include but is not limited to a power drill, a power grinder, a power wrench, a power screwdriver, a power hammer, a percussion power drill, a concrete vibrator, and a power planer, etc.

[0095] The following embodiments are described by taking the electric device as a vehicle for convenience of description.

[0096] Please refer to FIG. 1, which is a structural schematic diagram of a vehicle 1000 provided by some embodiments of the present application. The vehicle 1000 can be a fuel automobile, a gas automobile, or a new energy automobile, which can be a pure electric automobile, a hybrid electric automobile, or a range extended automobile, etc. The vehicle 1000 is internally provided with a battery device 100, which can be arranged at the bottom, the head, or the tail of the vehicle 1000. The battery device 100 can be used for power supply of the vehicle 1000, for example, the battery device 100 can be used as an operating power source of the vehicle 1000. The vehicle 1000 can further include a controller 200 and a motor 300, the controller 200 being used to control the battery device 100 to supply power to the motor 300, for example, for power demand of starting, navigation, and driving of the vehicle 1000.

[0097] In some embodiments of the present application, the battery device 100 can not only be used as an operating power source of the vehicle 1000, but also be used as a driving power source of the vehicle 1000, to replace or partially replace fuel or natural gas to provide driving power for the vehicle 1000.

[0098] Please refer to FIG. 2, FIG. 3, FIG. 4, and FIG. 5, FIG. 2 is an exploded view of the battery device 100 provided by some embodiments of the present application. FIG. 3 is an exploded view of a battery cell 20 provided by some embodiments of the present application. FIG. 4 is a structural schematic diagram of an electrode assembly 22 provided by some embodiments of the present application. FIG. 5 is a sectional view of the battery device 100 provided by some embodiments of the present application. The embodiments of the present application provide a battery device 100, which includes a box body 10 and a battery cell 20. The box body 10 includes a plurality of wall portions 13, which jointly define an accommodation space 131, and the battery cell 20 is accommodated in the accommodation space 131. The battery cell 20 includes an electrode assembly 22, which includes a positive electrode tab 223, a solid-state electrolyte layer 222, and a negative electrode tab 221, and the solid-state electrolyte layer 222 is arranged between the positive electrode tab 223 and the negative electrode tab 221. At least one wall portion 13 is provided with a heat insulation structure 30.

[0099] The battery device 100 can include a case 10 and battery cells 20 housed in the case 10. The case 10 is configured to provide a housing space 131 for the battery cells 20, and can have various configurations. In some embodiments, the case 10 can include a first portion 11 and a second portion 12, which are coupled to each other to define the housing space 131 for the battery cells 20. The second portion 12 can have a hollow structure with one open end, and the first portion 11 can have a plate-like structure that is coupled to the open end of the second portion 12 to define the housing space 131 together with the second portion 12. Alternatively, the first portion 11 and the second portion 12 can each have a hollow structure with one open end, and the open end of the first portion 11 can be coupled to the open end of the second portion 12. Of course, the case 10 formed by the first portion 11 and the second portion 12 can have various shapes, such as a rectangular parallelepiped.

[0100] The case 10 includes a plurality of wall portions 13 that define the housing space 131 for the battery cells 20. When the case 10 has a rectangular parallelepiped configuration, the case 10 includes six wall portions 13 that define the housing space 131 for the battery cells 20.

[0101] In the battery device 100, the battery cells 20 can be a plurality of battery cells 20, which can be connected in series, in parallel, or in a mixed connection. The mixed connection means that the plurality of battery cells 20 are connected in series and in parallel. The plurality of battery cells 20 can be directly connected in series, in parallel, or in a mixed connection, and the plurality of battery cells 20 can be housed in the case 10. Alternatively, the plurality of battery cells 20 can be connected in series, in parallel, or in a mixed connection to form a battery module, and a plurality of battery modules can be connected in series, in parallel, or in a mixed connection to form a whole, which can be housed in the case 10. The battery device 100 can further include other structures, for example, a current combiner for electrically connecting the plurality of battery cells 20.

[0102] Each of the battery cells 20 can be a secondary battery cell or a primary battery cell. The battery cells 20 can have various shapes, such as a flat body, a rectangular parallelepiped, or the like.

[0103] The battery cell 20 includes an outer case 21 and an electrode assembly 22. The outer case 21 includes a case body 211 having an open end and an end cap 212. The case body 211 has a receiving cavity for receiving the electrode assembly 22. The end cap 212 is coupled to the case body 211 to close the open end.

[0104] The end cap 212 refers to a component that covers the opening of the housing 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 housing 211 to fit the housing 211. Optionally, the end cap 212 can be made of a material with certain hardness and strength, such as aluminum alloy, so that the end cap 212 is less likely to deform when subjected to a pressing impact, allowing the battery cell 20 to have 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 disposed on the inner side of the end cap 212, which can be used to isolate the electrical connection components in the housing 211 from the end cap 212 to reduce the risk of short circuit. Exemplarily, the insulating member can be plastic, rubber, etc.

[0105] The housing 211 is a component for fitting the end cap 212 to form the internal environment of the battery cell 20, where 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, and an opening can be provided on the housing 211, and the end cap 212 is covered on the opening to form the internal environment of the battery cell 20. Without limitation, 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 enter the housing, and when it is necessary to seal the internal environment of the housing 211, the end cap 212 is covered on the housing 211. The housing 211 can be of various shapes and sizes, such as a cuboid, 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.

[0106] The electrode assembly 22 is a component in which electrochemical reactions occur in the battery cell 20. One or more electrode assemblies 22 can be contained in the housing 211. The electrode assembly 22 is mainly formed by stacking the positive electrode sheet 223, the solid-state electrolyte layer 222, and the negative electrode sheet 221. The positive electrode sheet 223 and the negative electrode sheet 221, which have portions of active materials, constitute the main body of the electrode assembly 22, and the portions of the positive electrode sheet 223 and the negative electrode sheet 221 without active materials each constitute a tab. The positive and negative tabs can be located together at one end of the main body or at two ends of the main body, respectively. During the charging and discharging process of the battery cell 20, the positive and negative active materials react with the solid-state electrolyte layer 222.

[0107] The heat conduction performance of the heat insulation structure 30 is poor, that is, the heat conductivity of the heat insulation structure 30 is low. The heat insulation structure 30 can reduce the speed of heat transfer to the outside, delay heat loss, and play a heat preservation role. The heat insulation structure 30 can be glass fiber, asbestos, rock wool, silicate, gel felt, vacuum plate, etc.

[0108] The heat insulation structure 30 can be arranged on one wall part 13 of the box body 10, or on two wall parts 13 of the box body 10, or on three wall parts 13 of the box body 10, or on more wall parts 13 of the box body 10. For example, the heat insulation structure 30 is arranged on each wall part 13.

[0109] The battery device 100 is provided with the heat insulation structure 30, which can reduce the speed of heat transfer to the outside, delay heat loss, and play a heat preservation role. In this way, the battery monomer 20 can work in a high-temperature state, which is beneficial to improve the ionic conductivity of the solid electrolyte layer 222, reduce the internal resistance of the battery device 100, and improve the energy density of the battery device 100.

[0110] Please refer to FIGS. 2, 3, 4 and 5. In some embodiments, the heat insulation structure 30 includes a first heat insulation layer 31 arranged on the side of the wall part 13 facing the containing space 131.

[0111] The heat conduction performance of the first heat insulation layer 31 is poor, that is, the heat conductivity of the first heat insulation layer 31 is low. The first heat insulation layer 31 can reduce the speed of heat transfer to the outside, delay heat loss, and play a heat preservation role. The first heat insulation layer 31 can be glass fiber, asbestos, rock wool, silicate, gel felt, vacuum plate, etc.

[0112] The first heat insulation layer 31 is arranged on the side of the wall part 13 facing the containing space 131, that is, the first heat insulation layer 31 is arranged on the inner side of the wall part 13. The first heat insulation layer 31 can be connected to the wall part 13. In some embodiments, the first heat insulation layer 31 is fixedly connected to the wall part 13, for example, the first heat insulation layer 31 is bonded to the wall part 13. In other embodiments, the first heat insulation layer 31 is detachably connected to the wall part 13, for example, the first heat insulation layer 31 is bolted to the wall part 13. Of course, the first heat insulation layer 31 can also not be connected to the wall part 13.

[0113] By arranging the first heat insulation layer 31 on the side of the wall part 13 facing the containing space 131, on the one hand, the wall part 13 can play a protective role on the first heat insulation layer 31, so that the first heat insulation layer 31 is not easy to be damaged and can stably play a heat preservation role. On the other hand, the first heat insulation layer 31 is relatively close to the battery monomer 20, and heat is less likely to be lost, so the heat preservation effect is better.

[0114] Please refer to FIG. 2, FIG. 3, FIG. 4 and FIG. 5. In some embodiments, the first thermal insulation layer 31 is a hollow thermal insulation structure.

[0115] The first thermal insulation layer 31 is formed with a hollow cavity, which can be a vacuum environment or have a gas thermal insulation medium 321, such as air.

[0116] The first thermal insulation layer 31 is a hollow thermal insulation structure, which has good thermal insulation effect and is light in weight, which is conducive to improving the energy density of the battery device 100.

[0117] Please refer to FIG. 6, which is a cross-sectional view of the battery device 100 according to some embodiments of the present application. The first thermal insulation layer 31 is made of a thermal insulation material.

[0118] The first thermal insulation layer 31 can be a solid structure, for example, the first thermal insulation layer 31 can be a plate structure. The first thermal insulation layer 31 is made of a thermal insulation material, thereby having good thermal insulation effect.

[0119] The first thermal insulation layer 31 is made of a thermal insulation material, thereby having good thermal insulation effect, which can slow down the speed of heat transfer to the outside, delay heat loss, make the battery monomer 20 work in a high-temperature state, improve the ionic conductivity of the solid-state electrolyte layer 222, reduce the internal resistance of the battery device 100, and improve the energy density of the battery device 100.

[0120] In some embodiments, the thermal conductivity of the first thermal insulation layer 31 is less than or equal to 0.03 W / (m·K).

[0121] Thermal conductivity refers to the heat transferred through 1 square meter of area in 1 second under stable heat transfer conditions, with a temperature difference of 1 degree between the two sides of 1 meter thick material.

[0122] The thermal conductivity of the first thermal insulation layer 31 can 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.

[0123] The material of the first thermal insulation layer 31 can be asbestos, rock wool, vacuum plate, etc.

[0124] When the thermal conductivity of the first thermal insulation layer 31 is less than or equal to 0.03 W / (m·K), the thermal insulation effect of the first thermal insulation layer 31 is good, which is conducive to making the battery monomer 20 work in a high-temperature state, improving the ionic conductivity of the solid-state electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0125] Please refer to FIG. 7, which is a sectional view of the battery device 100 according to some embodiments of the present application. In some embodiments, the heat insulation structure 30 comprises a heat insulation cavity 32 formed in the wall portion 13.

[0126] Please refer to FIG. 7, the wall portion 13 is a hollow heat insulation structure. The wall portion 13 is provided with the heat insulation cavity 32. The heat insulation cavity 32 can be a vacuum environment, or can be filled with a heat insulation medium 321.

[0127] The heat insulation structure 30 comprises the heat insulation cavity 32 formed in the wall portion 13. On the one hand, the heat insulation cavity 32 has 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 improve the energy density of the battery monomer 20.

[0128] In some embodiments, the heat insulation cavity 32 is a vacuum environment.

[0129] The heat insulation performance of the vacuum environment is good, which can reduce the speed of heat transfer to the outside, delay heat loss, and make the battery monomer 20 work in a high-temperature state, which is beneficial to improve the ionic conductivity of the solid electrolyte layer 222, reduce the internal resistance of the battery device 100, and improve the energy density of the battery device 100.

[0130] In some other embodiments, the heat insulation cavity 32 contains the heat insulation medium 321.

[0131] The heat insulation medium 321 can be a solid, such as asbestos, hard rubber, etc. The heat insulation medium 321 can also be a liquid, such as acetone, aniline, benzene, etc. The heat insulation medium 321 can also be a gas, such as air, water vapor, carbon dioxide, ethylene, etc.

[0132] By containing the heat insulation medium 321 in the heat insulation cavity 32, the manufacturing process is relatively simple, which is beneficial to control the manufacturing cost, and the heat insulation effect is good.

[0133] In some embodiments, the thermal conductivity of the heat insulation medium 321 is less than or equal to 0.03 W / (m·K).

[0134] The thermal conductivity of the heat insulation medium 321 can 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.

[0135] The heat insulation medium 321 can be asbestos, hard rubber, acetone, aniline, benzene, air, water vapor, carbon dioxide, ethylene, etc.

[0136] When the thermal conductivity of the heat insulation medium 321 is less than or equal to 0.03 W / (m·K), the heat insulation effect is good, which is beneficial to make the battery monomer 20 work in a high-temperature state, improve the ionic conductivity of the solid electrolyte layer 222, reduce the internal resistance of the battery device 100, and improve the energy density of the battery device 100.

[0137] Please refer to FIG. 9, which is a cross-sectional view of the battery device 100 provided by some embodiments of the present application. In some embodiments, the heat insulation structure 30 includes a second heat insulation layer 33, which is arranged on the side of the wall portion 13 away from the accommodation space 131.

[0138] The second heat insulation layer 33 has poor heat conduction performance, that is, the second heat insulation layer 33 has low thermal conductivity. The second heat insulation layer 33 can reduce the speed of heat transfer outward and delay heat loss, thereby playing a heat preservation role. The second heat insulation layer 33 can be glass fiber, asbestos, rock wool, silicate, gel felt, vacuum board, etc.

[0139] The second heat insulation layer 33 is arranged on the side of the wall portion 13 away from the accommodation space 131, that is, the second heat insulation layer 33 is arranged on the outer side of the wall portion 13. The second heat insulation layer 33 can be connected to the wall portion 13. In some embodiments, the first heat insulation layer 31 is fixedly connected to the wall portion 13, for example, the first heat insulation layer 31 is bonded to the wall portion 13. In other embodiments, the first heat insulation layer 31 is detachably connected to the wall portion 13, for example, the first heat insulation layer 31 is bolted to the wall portion 13.

[0140] The second heat insulation layer 33 is arranged on the side of the wall portion 13 away from the accommodation space 131, which is simpler and more convenient to manufacture, has low manufacturing cost, and has good heat insulation effect.

[0141] Please refer to FIG. 9, in some embodiments, the second heat insulation layer 33 is a hollow heat insulation structure.

[0142] The second heat insulation layer 33 is formed with a hollow cavity, which can be a vacuum environment or have a gas heat insulation medium 321, such as air.

[0143] The second heat insulation layer 33 is a hollow heat insulation structure, which has good heat insulation effect and small weight, which is beneficial to improve the energy density of the battery device 100.

[0144] Please refer to FIG. 10, which is a cross-sectional view of the battery device 100 provided by some other embodiments of the present application. In some other embodiments, the second heat insulation layer 33 is made of a heat insulation material.

[0145] The second heat insulation layer 33 can be a solid structure, for example, the second heat insulation layer 33 can be a plate structure. The second heat insulation layer 33 is made of a heat insulation material, thereby having good heat insulation effect.

[0146] The second thermal insulation layer 33 is made of a thermal insulation material, and thus the second thermal insulation layer 33 has a good thermal insulation effect, can further reduce the speed of heat transfer to the outside, delay heat dissipation, and make the battery monomer 20 work in a high-temperature state, which is conducive to improving the ionic conductivity of the solid-state electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0147] In some embodiments, the thermal conductivity of the second thermal insulation layer 33 is less than or equal to 0.03 W / (m·K).

[0148] The thermal conductivity of the second thermal insulation layer 33 can 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), or the like.

[0149] The material of the second thermal insulation layer 33 can be stone wool, rock wool, vacuum board, or the like.

[0150] 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 conducive to making the battery monomer 20 work in a high-temperature state, improving the ionic conductivity of the solid-state electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0151] Please refer to FIG. 10. In some embodiments, each wall portion 13 is provided with a thermal insulation structure 30.

[0152] “Each wall portion 13 is provided with a thermal insulation structure 30” means that all wall portions 13 of the box body 10 are provided with a thermal insulation structure 30.

[0153] By providing the thermal insulation structure 30 on each wall portion 13, the thermal insulation structure 30 is arranged around the battery monomer 20, which can further reduce the speed of heat transfer to the outside, delay heat dissipation, and play a heat preservation role. In this way, the battery monomer 20 can work in a high-temperature state, which is conducive to improving the ionic conductivity of the solid-state electrolyte layer 222, reducing the internal resistance of the battery device 100, and improving the energy density of the battery device 100.

[0154] Please refer to FIG. 11, which is a cross-sectional view of the battery device 100 according to another embodiment of the present application. In another embodiment, the battery device 100 further comprises a thermal management component 40 configured to adjust the temperature of the battery monomer 20.

[0155] The thermal management component 40 is a component for controlling the temperature of the battery cell 20 within a preset range. The thermal management component 40 can be used to cool the battery cell 20, or can be used to heat the battery cell 20. The thermal management component 40 can be in contact with the battery cell 20, and exchanges heat with the battery cell 20 through thermal conduction. For example, the thermal management component 40 can be a cold plate, and an outer surface of the thermal management component 40 is attached to an outer surface of the battery cell 20. The thermal management component 40 can also be spaced apart from the workpiece, and exchanges heat with the workpiece through convection or thermal radiation.

[0156] The thermal management component 40 includes a medium inlet and a medium outlet. The medium inlet is used for the heat exchange medium to flow into the thermal management component 40, and the medium outlet is used for the heat exchange medium to flow out of the thermal management component 40.

[0157] The heat exchange medium can be water, or can be freon, tetrafluoroethane, trifluoromethane, etc.

[0158] By providing the thermal management component 40, the temperature of the battery cell 20 can be adjusted, so that the battery cell 20 works at a suitable temperature, thereby facilitating the full performance of the battery cell 20.

[0159] Please refer to FIG. 11. In some embodiments, the plurality of wall portions 13 includes a first wall portion 132, the first wall portion 132 is provided with the thermal insulation structure 30, and the thermal management component 40 is arranged between the first wall portion 132 and the battery cell 20. The thermal insulation structure 30 arranged on the first wall portion 132 is located on a side of the thermal management component 40 away from the battery cell 20.

[0160] The thermal management component 40 is arranged between the first wall portion 132 and the battery cell 20, and the thermal insulation structure 30 arranged on the first wall portion 132 is located on a side of the thermal management component 40 away from the battery cell 20. That is, the thermal management component 40 is closer to the battery cell 20 than the thermal insulation structure 30 arranged on the first wall portion 132, so as to facilitate the thermal management of the battery cell 20 without being easily affected by the thermal insulation structure 30.

[0161] The thermal insulation structure 30 arranged on the first wall portion 132 is located on a side of the thermal management component 40 away from the battery cell 20, so that the thermal management component 40 can be closer to the battery cell 20, and the thermal insulation structure 30 is not easy to affect the thermal management component 40, so that the thermal management component 40 can better manage the temperature of the battery cell 20.

[0162] The embodiments of the present application also provide a power consumption device. The power consumption device includes the battery device 100 described above, and the battery device 100 is used to provide power for the power consumption device.

[0163] According to some embodiments of the present application, please refer to FIGS. 5-11.

[0164] The battery device 100 provided by the embodiment of the present application comprises a box body 10 and a battery cell 20. The box body 10 comprises a plurality of wall portions 13, which jointly define a containing space 131, and the battery cell 20 is contained in the containing space 131. The battery cell 20 comprises an electrode assembly 22, which comprises a positive electrode sheet 223, a solid-state electrolyte layer 222 and a negative electrode sheet 221, and the solid-state electrolyte layer 222 is arranged between the positive electrode sheet 223 and the negative electrode sheet 221. At least one wall portion 13 is provided with a heat insulation structure 30. The battery device 100 is provided with the heat insulation structure 30, which can reduce the speed of heat transfer to the outside, delay heat dissipation and play a heat preservation role. In this way, the battery cell 20 can work in a high-temperature state, which is beneficial to improve the ionic conductivity of the solid-state electrolyte layer 222, reduce the internal resistance of the battery device 100 and improve the energy density of the battery device 100.

[0165] The heat insulation structure 30 comprises a first heat insulation layer 31, which is arranged on the side of the wall portion 13 facing the containing space 131. By arranging the first heat insulation layer 31 on the side of the wall portion 13 facing the containing space 131, on the one hand, the wall portion 13 can play a protective role for the first heat insulation layer 31, so that the first heat insulation layer 31 is not easy to be damaged and can stably play a heat preservation role. On the other hand, the first heat insulation layer 31 is relatively close to the battery cell 20, heat dissipation is more difficult, and the heat preservation effect is better.

[0166] The first heat insulation layer 31 is a hollow heat insulation structure. The first heat insulation layer 31 is a hollow heat insulation structure, the heat insulation effect of the first heat insulation layer 31 is better, and the weight of the first heat insulation layer 31 is smaller, which is beneficial to improve the energy density of the battery device 100.

[0167] Each wall portion 13 is provided with the heat insulation structure 30. By arranging the heat insulation structure 30 around the battery cell 20, the speed of heat transfer to the outside can be further reduced, heat dissipation can be delayed, and a heat preservation role can be played. In this way, the battery cell 20 can work in a high-temperature state, which is beneficial to improve the ionic conductivity of the solid-state electrolyte layer 222, reduce the internal resistance of the battery device 100 and improve the energy density of the battery device 100.

[0168] The battery device 100 further comprises a thermal management component 40 configured to regulate the temperature of the battery cell 20. The plurality of wall portions 13 comprises a first wall portion 132 provided with a thermal insulation structure 30, the thermal management component 40 is disposed between the first wall portion 132 and the battery cell 20, and 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. 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, so that the thermal management component 40 can be closer to the battery cell 20, the thermal insulation structure 30 is not easy to affect the thermal management component 40, so that the thermal management component 40 can better manage the temperature of the battery cell 20.

[0169] The above only describes the preferred embodiments of the present application and is not intended to limit the present application. Those skilled in the art can make various modifications and changes to the present application. Any modification, equivalent replacement, improvement, etc. within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A battery device, wherein, The battery device comprises: a box body comprising a plurality of wall portions, which collectively define a containing space; a battery cell accommodated in the containing space, the battery cell comprising an electrode assembly, the electrode assembly comprising a positive electrode tab, a solid-state electrolyte layer, and a negative electrode tab, the solid-state electrolyte layer being disposed between the positive electrode tab and the negative electrode tab; at least one of the wall portions is provided with a heat insulation structure.

2. The battery device of claim 1, wherein, The heat insulation structure comprises a first heat insulation layer disposed on a side of the wall portion facing the containing space.

3. The battery device of claim 2, wherein, The first heat insulation layer is a hollow heat insulation structure.

4. The battery device of claim 2, wherein, The first heat insulation layer is made of a heat insulation material.

5. The battery device according to any one of claims 2 to 4, wherein The first heat insulation layer has a thermal conductivity less than or equal to 0.03 W / (m·K).

6. The battery device according to any one of claims 1 to 5, wherein The heat insulation structure comprises a heat insulation cavity formed in the wall portion.

7. The battery device of claim 6, wherein, The heat insulation cavity is in a vacuum environment.

8. The battery device of claim 6, wherein, The heat insulation cavity contains a heat insulation medium.

9. The battery device of claim 8, wherein, The heat insulation medium has a thermal conductivity less than or equal to 0.03 W / (m·K).

10. The battery device according to any one of claims 1 to 9, wherein The heat insulation structure comprises a second heat insulation layer disposed on a side of the wall portion away from the containing space.

11. The battery device of claim 10, wherein, The second heat insulation layer is a hollow heat insulation structure.

12. The battery device of claim 10, wherein, The second heat insulation layer is made of a heat insulation material.

13. The battery device according to any one of claims 10 to 12, wherein, The second heat insulation layer has a thermal conductivity less than or equal to 0.03 W / (m·K).

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

15. The battery device according to any one of claims 1 to 14, wherein The battery device further comprises a thermal management component configured to regulate the temperature of the battery cell.

16. The battery device of claim 15, wherein, The plurality of wall portions comprises a first wall portion provided with the heat insulation structure, the thermal management component being disposed between the first wall portion and the battery cell, and the heat insulation structure of the first wall portion being located on a side of the thermal management component away from the battery cell.

17. An electrical device, comprising: The battery device according to any one of claims 1-16 is used to provide electric energy for the electric device.

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