Battery device and electric device

Abstract

The utility model provides a battery device and a power utilization device. The battery device comprises a battery monomer and a heat insulation part, the plurality of battery cells are arranged along a first direction. The heat insulation parts are arranged between the adjacent battery monomers, and a plurality of concave parts are formed in one side, facing the battery monomers, of each heat insulation part. The reliability of the battery device can be improved.

Description

Technical Field

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

[0002] Battery cells are widely used in electronic devices, such as mobile phones, laptop computers, battery cars, electric vehicles, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and electric tools, etc. Battery cells can include nickel-cadmium battery cells, nickel-metal hydride battery cells, lithium-ion battery cells, and secondary alkaline zinc-manganese battery cells, etc.

[0003] In the development of battery technology, how to improve the reliability of battery devices has always been a research direction in battery technology. Summary of the Utility Model

[0004] In view of the above problems, the present application provides a battery device and an electrical device, which can improve the reliability of the battery device.

[0005] In a first aspect, the present application provides a battery device. The battery device includes battery cells and a heat insulation member. A plurality of battery cells are arranged in a first direction. The heat insulation member is disposed between adjacent battery cells, and a plurality of concave portions are provided on a side of the heat insulation member facing the battery cells.

[0006] In the above solution, by providing the heat insulation member, when the battery cell expands, when the region with a large expansion deformation amount in the battery cell presses against the heat insulation member, due to the existence of the concave portions, the region of the heat insulation member that does not press against the battery cell will bend towards the region with a small expansion deformation amount of the battery cell, so that the region with a small expansion deformation amount of the battery cell fits with the heat insulation member, thereby improving the heat absorption and heat insulation effects of the heat insulation member. Moreover, the fitting region between the heat insulation member and the battery cell can change the expansion stress of the battery cell, so as to reduce the extrusion force on the adjacent battery cells, improve the expansion stress release effect on the battery cells, and improve the reliability of the battery device.

[0007] In some embodiments, concave portions are provided on both sides of the heat insulation member in the first direction.

[0008] In the above solution, the heat insulation member can fit the battery cells on both sides, increasing the fitting area between the heat insulation member and the battery cells on both sides, and improving the heat absorption and heat insulation effects of the heat insulation member.

[0009] In some embodiments, at least some of the plurality of concave portions intersect.

[0010] In the above solution, it is beneficial to divide the heat insulation member into multiple regions. Moreover, when each region is subjected to the expansion stress of the battery cell, the expansion stress can conduct the expansion stress to the surrounding regions in different directions, so that the surrounding regions move closer to the battery cell, enabling the surrounding regions to fit the battery cell, improving the release effect of the expansion stress, and enhancing the heat absorption and heat insulation effects of the heat insulation member.

[0011] In some embodiments, along the direction away from the battery cell, the cross-sectional area of the concave portion gradually decreases in the section perpendicular to the first direction, which is beneficial to increasing the bending radius of the concave portion, further reducing the gap between the heat insulation member and the battery cell, and enhancing the heat absorption and heat insulation effects of the heat insulation member.

[0012] In some embodiments, the depth of the concave portion is h, and the thickness of the heat insulation member is H. The relationship between h and H is: 0.5H ≤ h ≤ 0.95H, which is beneficial to further increasing the bending radius of the concave portion, further reducing the gap between the heat insulation member and the battery cell, and enhancing the heat absorption and heat insulation effects of the heat insulation member.

[0013] In some embodiments, the dimension of the concave portion in the width direction is 3 mm to 7 mm, which is beneficial to reducing the internal space of the concave portion while reducing the manufacturing precision of the concave portion.

[0014] In some embodiments, the number of the concave portions includes multiple, and the distance between two adjacent concave portions is d. The dimension of the heat insulation member in the direction where two adjacent concave portions are arranged side by side is D. The relationship between d and D is 0.01D ≤ d ≤ 0.3D.

[0015] In the above solution, it is beneficial to increase the distribution density of the concave portions, thereby improving the overall bending effect of the heat insulation member and the fitting effect between the heat insulation member and the battery cell.

[0016] In some embodiments, the heat insulation member further includes a main body portion and a plurality of convex portions located on the main body portion. A concave portion is formed between two adjacent convex portions. Among them, the plurality of convex portions include a first convex portion and a second convex portion. A concave portion is provided between the first convex portion and the second convex portion, and the dimension of the first convex portion in the first direction is greater than the dimension of the second convex portion in the first direction.

[0017] In the above solution, by providing the first convex portion and the second convex portion, it is beneficial to increase the gap between the battery cell and the heat insulation member, thereby increasing the space in which the battery cell can expand and reducing the possibility of rupture caused by mutual extrusion between adjacent battery cells.

[0018] In some embodiments, a concave portion is provided between two adjacent first convex portions; and / or, a concave portion is provided between two adjacent second convex portions.

[0019] In the above solution, it is beneficial to increase the distribution density of the concave portions, thereby further improving the overall bending effect of the heat insulation member and enhancing the fitting effect between the heat insulation member and the battery cell.

[0020] In some embodiments, the concave portion includes a first sub-concave portion and a second sub-concave portion. The first sub-concave portion is disposed between two adjacent first convex portions, and the second sub-concave portion is disposed between two adjacent second convex portions. The bottom walls of the first sub-concave portion and the second sub-concave portion are flush with each other.

[0021] In the above solution, it is beneficial to improve the uniformity of the bending angles in different regions of the heat insulation member and enhance the fitting effect between the heat insulation member and the battery cell.

[0022] In some embodiments, the heat insulation member includes a first sub-heat insulation member and two second sub-heat insulation members. The first sub-heat insulation member is located between the two second sub-heat insulation members, and the concave portion is disposed at least on the side of the second sub-heat insulation member facing away from the first sub-heat insulation member.

[0023] In the above solution, while being beneficial to improve the heat absorption and heat insulation effects of the heat insulation member, it also improves the overall bending effect of the heat insulation member and reduces the possibility of the heat insulation member breaking from the concave portion.

[0024] In some embodiments, the first sub-heat insulation member includes an outer layer and a filling layer covered by the outer layer, and the filling layer includes a non-Newtonian fluid.

[0025] In the above solution, the non-Newtonian fluid has thixotropy. During the operation of the battery cell, both sides of the heat insulation member in the first direction are subjected to the extrusion force of the battery cell. The extrusion forces on both sides can be regarded as a special shear force. With the repeated cyclic expansion of the battery cell, the shear force continues. Due to its own fluidity, the non-Newtonian fluid will flow to the region with a smaller shear force and leave an expansion gap for the battery cell at its original position to increase the expansion space of the battery cell. At the same time, this fluidity can make the heat insulation member and the battery cell fit closely, reduce the gap space between the heat insulation member and the battery cell, and improve the heat absorption and heat insulation effects of the heat insulation member. Moreover, the non-Newtonian fluid also has the property of shear thickening. When the heat insulation member is suddenly subjected to a strong external impact, the non-Newtonian fluid will harden, thereby reducing the possibility of a failed battery cell affecting the normally operating battery cells.

[0026] In some embodiments, the filling layer is an aqueous solution of acrylic acid, an aqueous solution of sodium polyacrylate, an aqueous solution of polyacrylamide, an aqueous solution of polyvinyl alcohol, an aqueous solution of methyl methacrylate, an aqueous solution of polyethylene oxide, or an aqueous solution of polygluconic acid, a starch suspension, a sand suspension, mud, a cellulose suspension, a diatomite suspension, a plastic particle suspension, a rubber particle suspension, or a powder coating, thereby expanding the application range of the heat insulation member and reducing the preparation cost of the heat insulation member.

[0027] In some embodiments, the heat insulation member includes an accommodation space located inside the heat insulation member, and the accommodation space is filled with a non-Newtonian fluid.

[0028] In the above solution, it is beneficial to reduce the overall thickness of the heat insulation member while improving the buffering effect of the heat insulation member.

[0029] In a second aspect, an electric device provided by an embodiment of the present application includes the battery device in any one of the foregoing embodiments, and the battery device is used to provide electrical energy.

[0030] The above description is only an overview of the technical solution of the present application. In order to be able to understand the technical means of the present application more clearly, it can be implemented according to the content of the description. And in order to make the above and other purposes, features and advantages of the present application more obvious and understandable, the specific embodiments of the present application are specifically exemplified below. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required to be used in the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained according to these drawings without creative efforts.

[0032] Figure 1 is a schematic structural diagram of a vehicle provided by an embodiment of the present application;

[0033] Figure 2 is an exploded structural diagram of a battery provided by an embodiment of the present application;

[0034] Figure 3 is a schematic structural diagram of a battery module provided by an embodiment of the present application;

[0035] Figure 4 is a schematic structural diagram of a battery device provided by an embodiment of the present application;

[0036] Figure 5 is a schematic structural diagram of a heat insulation member provided by an embodiment of the present application;

[0037] Figure 6 is a schematic cross-sectional view of a heat insulation member provided by an embodiment of the present application;

[0038] Figure 7 is another schematic cross-sectional structure diagram of a heat insulation member provided by an embodiment of the present application;

[0039] Figure 8 is another schematic structural diagram of a heat insulation member provided by an embodiment of the present application;

[0040] Figure 9It is a schematic structural diagram of another heat insulation member provided by an embodiment of the present application;

[0041] Figure 10 It is a schematic cross-sectional structural diagram of another heat insulation member provided by an embodiment of the present application;

[0042] Figure 11 It is a schematic cross-sectional structural diagram of another heat insulation member provided by an embodiment of the present application;

[0043] Figure 12 It is a schematic cross-sectional structural diagram of another heat insulation member provided by an embodiment of the present application;

[0044] Figure 13 It is a schematic cross-sectional structural diagram of another heat insulation member provided by an embodiment of the present application;

[0045] Figure 14 It is a schematic cross-sectional structural diagram of another heat insulation member provided by an embodiment of the present application;

[0046] Figure 15 It is a schematic cross-sectional structural diagram of another heat insulation member provided by an embodiment of the present application.

[0047] Marking description

[0048] 1000, vehicle;

[0049] 100, battery device; 200, controller; 300, motor; 400, box body; 410, first box body part; 420, second box body part; 430, accommodating part; 500, battery module;

[0050] 10, battery cell;

[0051] 20, heat insulation member; 21, concave part; 211, first sub-concave part; 212, second sub-concave part; 213, third sub-concave part; 22, convex part; 221, first convex part; 222, second convex part; 23, body part; 24, first sub-heat insulation member; 241, outer cladding; 242, filling layer; 25, second sub-heat insulation member; E1, accommodating space;

[0052] Z, first direction; X, second direction; Y, third direction. Detailed implementation manners

[0053] Hereinafter, embodiments of the technical solutions of the present application will be described in detail with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solutions of the present application, and thus are only examples and cannot be used to limit the protection scope of the present application.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the technical field to which this application belongs; the terms used herein 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 description of the drawings are intended to cover non-exclusive inclusion.

[0055] In the description of the embodiments of this application, technical terms such as "first" and "second" are only used to distinguish different objects and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity, specific order, or primary-secondary relationship of the indicated technical features. In the description of the embodiments of this application, the meaning of "a plurality" is more than two, unless otherwise specifically defined.

[0056] Reference to "embodiment" herein means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase does not necessarily refer to the same embodiment when it appears in various places in the specification, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0057] In the description of the embodiments of this application, the term "and / or" is merely a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " herein generally represents an "or" relationship between the associated objects before and after.

[0058] In the description of the embodiments of this application, the term "a plurality" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0059] In the description of the embodiments of this application, the orientation or positional relationship indicated by technical terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the embodiments of this application and simplifying the description, and does not indicate or imply that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of this application.

[0060] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection", "fixation" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or integrated; it can also be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two components or the interaction relationship between two components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0061] In the embodiments of the present application, the battery cell can be a secondary battery, which refers to a battery cell that can be activated by charging to continue using after discharging.

[0062] The battery cell can be a lithium-ion battery, a sodium-ion battery, a sodium-lithium-ion battery, a lithium-metal battery, a sodium-metal battery, a lithium-sulfur battery, a magnesium-ion battery, a nickel-metal hydride battery, a nickel-cadmium battery, a lead-acid battery, etc., and the embodiments of the present application do not limit this.

[0063] Generally, the battery cell includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charge and discharge process of the battery cell, active ions (such as lithium ions) are embedded and extracted back and forth between the positive electrode and the negative electrode. The separator is arranged between the positive electrode and the negative electrode, which can play a role in preventing short circuit between the positive and negative electrodes and at the same time allow active ions to pass through.

[0064] In some embodiments, the positive electrode can be a positive electrode sheet, and the positive electrode sheet can include a positive electrode current collector and a positive electrode active material provided on at least one surface of the positive electrode current collector.

[0065] As an example, the positive electrode current collector has two surfaces opposite to each other in its own thickness direction, and the positive electrode active material is provided on any one or both of the two opposite surfaces of the positive electrode current collector.

[0066] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, stainless steel with silver surface treatment, copper, aluminum, nickel, 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 (such as aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0067] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative electrode current collector.

[0068] As an example, the negative electrode current collector can be a metal foil, a foam metal, a foam carbon, or a composite current collector. For example, as the metal foil, stainless steel with a silver surface treatment, copper, aluminum, nickel, carbon electrodes, carbon, nickel, titanium, etc. can be used. The foam metal can be foam nickel, foam copper, foam aluminum, or foam alloy, etc. 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 (such as copper, copper alloy, nickel, nickel alloy, titanium, titanium alloy, silver, and silver alloy, etc.) on a polymer material substrate (such as polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0069] As an example, the negative electrode sheet can include a negative electrode current collector and a negative electrode active material disposed on at least one surface of the negative electrode current collector.

[0070] As an example, the negative electrode current collector has two surfaces opposite to each other in its own thickness direction, and the negative electrode active material is disposed on any one or both of the two opposite surfaces of the negative electrode current collector.

[0071] As an example, the negative electrode active material can be the negative electrode active material for a battery cell known in the art. As an example, the negative electrode active material can include at least one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc.

[0072] In some embodiments, the material of the positive electrode current collector can be aluminum, and the material of the negative electrode current collector can be copper.

[0073] In some embodiments, the electrode assembly further includes a separator disposed between the positive electrode and the negative electrode.

[0074] In some embodiments, the separator is a separator membrane. The present application does not particularly limit the type of the separator membrane, and any known porous structure separator membrane with good chemical stability and mechanical stability can be selected.

[0075] As an example, the main material of the separator membrane can be selected from at least one of glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics.

[0076] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive electrode and the negative electrode, and simultaneously functions to transport ions and isolate the positive and negative electrodes.

[0077] In some embodiments, the battery cell further includes an electrolyte that functions to conduct ions between the positive and negative electrodes. The present application does not specifically limit the type of the electrolyte, and it can be selected according to requirements. The electrolyte can be liquid, gel-like, or solid.

[0078] In some embodiments, the electrode assembly is provided with tabs, and the tabs can conduct current out of the electrode assembly. The tabs include a positive tab and a negative tab.

[0079] The battery device 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 a plurality of battery cells, and the plurality of battery cells are connected in series, parallel or in a hybrid connection through a busbar component.

[0080] In some embodiments, the battery cell assembly is usually formed by arranging a plurality of battery cells; as an example, the battery cell assembly may be a battery module, and the battery module is formed by arranging and fixing a plurality of battery cells to form an independent module. As an example, the battery module may be formed by bundling a plurality of battery cells with cable ties.

[0081] In some embodiments, the battery device may be a battery pack, and the battery pack includes a box body and one or more battery cell assemblies, and the battery cell assemblies are accommodated in the box body.

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

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

[0084] In some embodiments, the box body may be part of the chassis structure of a vehicle. For example, a part of the box body may become at least a part of the floor of the vehicle, or a part of the box body may become at least a part of the cross beam and longitudinal beam of the vehicle.

[0085] In some embodiments, the battery device may be an energy storage device. The energy storage device includes an energy storage container, an energy storage cabinet, etc.

[0086] The development of battery technology needs to consider various design factors at the same time. For example, performance parameters such as energy density, cycle life, discharge capacity, charge and discharge rate, etc. In addition, the reliability of the battery device also needs to be considered.

[0087] The battery device may include a plurality of battery cells, and a heat insulation member is arranged between the plurality of battery cells to reduce the heat conduction between the battery cells. The battery cells will expand during the cycle, and during the expansion process, the expansion stress of the battery cells is not uniform, which will cause the expansion deformation amount in some areas of the battery cells to be larger. For example, the expansion deformation amount in the middle area of the battery cell will be greater than the battery deformation amount in the peripheral area of the battery cell, resulting in a gap between the heat insulation member and the battery cell. The existence of the gap will, on the one hand, reduce the heat insulation and heat absorption effects of the heat insulation member, and on the other hand, it will also reduce the release and buffering effect of the heat insulation member on the expansion stress of the battery cell, thereby resulting in a decrease in the reliability of the battery device.

[0088] Based on the above technical problems, the present application provides a technical solution. By providing a heat insulation member, when the battery cell expands, when the region with a large expansion deformation amount in the battery cell presses against the heat insulation member, due to the presence of the concave portion, the region of the heat insulation member that does not press against the battery cell will bend towards the region with a small expansion deformation amount of the battery cell, so that the region with a small expansion deformation amount of the battery cell fits against the heat insulation member, thereby improving the heat absorption and heat insulation effects of the heat insulation member. Moreover, the fitting region between the heat insulation member and the battery cell can change the expansion stress of the battery cell, so as to reduce the pressing force on adjacent battery cells, improve the effect of releasing the expansion stress of the battery cell, and improve the reliability of the battery device.

[0089] The technical solutions described in the embodiments of the present application are applicable to batteries and electrical devices using batteries. The electrical devices are, for example, mobile phones, portable devices, laptop computers, battery cars, electric vehicles, ships, spacecrafts, electric toys, and electric tools, etc. Among them, the spacecrafts are, for example, airplanes, rockets, space shuttles, and spaceships, etc. The electric toys include, for example, fixed or mobile electric toys. Specifically, for example, game consoles, electric vehicle toys, electric ship toys, and electric airplane toys, etc. The electric tools include, for example, metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools. Specifically, for example, electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact electric drills, concrete vibrators, and electric planers.

[0090] The battery cells described in the embodiments of the present application are not limited to being applicable to the above-described electrical devices. However, for the sake of brevity of description, the following embodiments will be described by taking electric vehicles as an example.

[0091] Please refer to Figure 1 , Figure 1 which is a schematic structural diagram of a vehicle provided by an embodiment of the present application.

[0092] The vehicle 1000 can be a fuel vehicle, a gas vehicle, or a new energy vehicle. The new energy vehicle can be a pure electric vehicle, a hybrid electric vehicle, an extended-range electric vehicle, etc. A battery device 100 can be provided inside the vehicle 1000. Specifically, for example, the battery device 100 can be provided at the bottom, the front end, or the rear end 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 the operating power source of the vehicle 1000. The vehicle 1000 can also include a controller 200 and a motor 300. The controller 200 is used to control the power supply of the battery to the motor 300, for example. The battery can be used for starting, navigation, etc. of the vehicle 1000. Of course, the battery device 100 can also be used to drive the vehicle 1000 to travel, replacing or partially replacing fuel or natural gas to provide drive for the vehicle 1000.

[0093] Figure 2 It is a schematic diagram of the explosion structure of a battery provided by an embodiment of the present application. As Figure 2 shown, the battery device 100 includes a box body 400 and battery cells (not shown in the figure), and the battery cells are accommodated in the box body 400.

[0094] The box body 400 is used to accommodate battery cells, and the box body 400 can have various structures. In some embodiments, the box body 400 may include a first box body portion 410 and a second box body portion 420. The first box body portion 410 and the second box body portion 420 cover each other, and the first box body portion 410 and the second box body portion 420 jointly define a receiving portion 430 for accommodating battery cells. The second box body portion 420 can be a hollow structure with one end open, and the first box body portion 410 is a plate-like structure. The first box body portion 410 covers the opening side of the second box body portion 420 to form a box body with the receiving portion 430; both the first box body portion 410 and the second box body portion 420 can also be hollow structures with one side open, and the opening side of the first box body portion 410 covers the opening side of the second box body portion 420 to form the box body 400 with the receiving portion 430. Of course, the first box body portion 410 and the second box body portion 420 can have various shapes, such as a cylinder, a cuboid, etc.

[0095] In the battery device 100, there can be multiple battery cells. The multiple battery cells can be connected in series, in parallel, or in a mixed connection. A mixed connection means that there are both series and parallel connections among the multiple battery cells. The multiple battery cells can be directly connected in series, in parallel, or in a mixed connection together, and then the whole formed by the multiple battery cells is accommodated in the box body 400; of course, it can also be that multiple battery cells are first connected in series, in parallel, or in a mixed connection to form battery modules 500, and then the multiple battery modules 500 are connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body 400.

[0096] Figure 3 It is a schematic diagram of the structure of a battery module provided by an embodiment of the present application.

[0097] In some embodiments, as Figure 3 shown, there are multiple battery cells 110. The multiple battery cells 110 are first connected in series, in parallel, or in a mixed connection to form battery modules 500. The multiple battery modules 500 are then connected in series, in parallel, or in a mixed connection to form a whole and are accommodated in the box body.

[0098] Figure 4 It is a schematic diagram of the structure of a battery device provided by an embodiment of the present application. Figure 5 It is a schematic diagram of the structure of a heat insulation member provided by an embodiment of the present application. Figure 6 It is a cross-sectional schematic diagram of a heat insulation member provided by an embodiment of the present application. Figure 7 It is a cross-sectional structure schematic diagram of another heat insulation member provided by an embodiment of the present application.

[0099] Please refer to Figures 4 to 7 , an embodiment of the present application provides a battery device. The battery device 100 includes battery cells 10 and a heat insulation member 20. A plurality of battery cells 10 are arranged along a first direction Z. The heat insulation member 20 is disposed between adjacent battery cells 10, and a plurality of recesses 21 are provided on a side of the heat insulation member 20 facing the battery cells 10.

[0100] The heat insulation member 20 is a structure prepared from a heat insulation material, and the heat insulation material can be silica gel, mica, silica aerogel, etc. The heat insulation member 20 can be fixedly bonded between adjacent battery cells 10 through a colloid. For example, a heat-resistant adhesive is used as the colloid, which has high bonding reliability. The heat-resistant adhesive can be thermally conductive silica gel, epoxy resin, phosphate, polyimide, or phenolic resin-like, etc. Of course, the heat insulation member 20 can also be clamped between adjacent battery cells 10 by an external force. For example, a plurality of battery cells 10 arranged side by side are fastened by a hoop band, and the adjacent battery cells 10 apply a clamping force to the heat insulation member 20.

[0101] Optionally, the heat insulation member 20 is located between two battery cells 10, and the recess 21 can be provided only on one side of the heat insulation member 20 facing one battery cell 10. Of course, the recesses 21 can also be provided on both sides of the heat insulation member 20 facing the two battery cells 10 respectively.

[0102] Optionally, the recesses 21 provided on the side of the heat insulation member 20 facing the battery cells 10 can extend in a single direction or in multiple directions. For example, the orthographic projection shape of the recess 21 on the heat insulation member 20 is linear, or the orthographic projection shape of the recess 21 on the heat insulation member 20 is wavy, loop-shaped, or annular.

[0103] Optionally, the recess 21 can penetrate through a plane perpendicular to the first direction Z.

[0104] Optionally, a plurality of recesses 21 divide the heat insulation member 20 into a plurality of regions. The surface of each region is in contact with the battery cell 10. Taking the region of the heat insulation member 20 in contact with the part of the battery cell 10 with a large expansion deformation amount as the first region and the region of the heat insulation member 20 in contact with the part of the battery cell 10 with a small expansion deformation amount as the second region as an example, when the battery cell 10 expands, the heat insulation member 20 in the first region will deform towards the side away from the battery cell 10. At this time, a gap will be generated between the heat insulation member 20 in the second region and the battery cell 10. As the first region deforms, the recess 21 between the first region and the second region will bend, causing the second region to approach the battery cell 10, so that the second region and the battery cell 10 are in contact with each other.

[0105] Optionally, the shape and size of the heat insulation member 20 are the same as the shape and size of one side surface of the battery cell 10 along the first direction Z.

[0106] Optionally, the heat insulation member 20 may be made of a heat insulation material with a certain deformation ability.

[0107] In the technical solution of the embodiment of the present application, by providing the heat insulation member 20, when the battery cell 10 expands, when the area with a large expansion deformation amount in the battery cell 10 squeezes the heat insulation member 20, due to the existence of the concave portion 21, the area of the heat insulation member 20 that does not squeeze the battery cell 10 will bend towards the area with a small expansion deformation amount of the battery cell 10, so that the area with a small expansion deformation amount of the battery cell 10 fits the heat insulation member 20, thereby improving the heat absorption and heat insulation effects of the heat insulation member 20. Moreover, the fitting area between the heat insulation member 20 and the battery cell 10 can change the expansion stress of the battery cell 10, so as to reduce the squeezing force on the adjacent battery cell 10, improve the expansion stress release effect on the battery cell 10, and improve the reliability of the battery device 100.

[0108] In some optional embodiments, please refer to Figure 4 and Figure 7 , concave portions 21 are provided on both sides of the heat insulation member 20 along the first direction Z.

[0109] It can be understood that battery cells 10 are provided on both sides of the heat insulation member 20 along the first direction Z. The concave portions 21 provided on both sides of the heat insulation member 20 along the first direction Z enable the heat insulation member 20 to fit the battery cells 10 on both sides, increase the fitting area between the heat insulation member 20 and the battery cells 10 on both sides, and improve the heat absorption and heat insulation effects of the heat insulation member 20.

[0110] Optionally, the shapes of the concave portions 21 on both sides of the heat insulation member 20 along the first direction Z may be the same. For example, the orthographic projections of the concave portions 21 on both sides of the heat insulation member 20 on the heat insulation member 20 are completely coincident. Of course, the shapes of the concave portions 21 on both sides of the heat insulation member 20 along the first direction Z may also be different.

[0111] Figure 8 FIG. Figure 9 FIG.

[0112] In some optional embodiments, please refer to Figure 8 and Figure 9 , at least some of the multiple concave portions 21 intersect.

[0113] Optionally, as Figure 8 shown, a part of the multiple concave portions 21 may extend along the second direction X, and another part of the multiple concave portions 21 may extend along the third direction Y, and the two parts of the concave portions 21 intersect.

[0114] Optionally, as Figure 9 shown, a plurality of recesses 21 may intersect to form a cross shape, and the plurality of cross-shaped recesses 21 are arranged in an array on the heat insulation member 20.

[0115] Optionally, a part of the plurality of recesses 21 may be in a plurality of concentric annular shapes, and the plurality of concentric annular shapes are centered on the centroid of the surface of the heat insulation member 20 facing the battery cell 10, and a plurality of concentric annular shapes are formed in sequence in a direction away from the center of the circle. Another part of the plurality of recesses 21 extends in a single direction and penetrates the center of the circle.

[0116] In these optional embodiments, through the above settings, it is beneficial to divide the heat insulation member 20 into a plurality of regions, and when each region is subjected to the expansion stress of the battery cell 10, the expansion stress can conduct the expansion stress to the surrounding regions in different directions, so that the surrounding regions approach the battery cell 10, so that the surrounding regions fit the battery cell 10, improving the release effect of the expansion stress and the heat absorption and heat insulation effects of the heat insulation member 20.

[0117] In some optional embodiments, please refer to Figure 6 , along the direction away from the battery cell 10, the cross-sectional area of the recess 21 gradually decreases along the section perpendicular to the first direction Z, which is beneficial to increasing the bending radius of the recess 21, further reducing the gap between the heat insulation member 20 and the battery cell 10, and improving the heat absorption and heat insulation effects of the heat insulation member 20.

[0118] Exemplarily, the cross-sectional shape of the recess 21 may be V-shaped or trapezoidal.

[0119] In some optional embodiments, please refer to Figure 6 , the depth of the recess 21 is h, and the thickness of the heat insulation member 20 is H. The relationship between h and H is: 0.5H ≤ h ≤ 0.95H, which is beneficial to further increasing the bending radius of the recess 21, further reducing the gap between the heat insulation member 20 and the battery cell 10, and improving the heat absorption and heat insulation effects of the heat insulation member 20.

[0120] Exemplarily, the depth of the recess 21 may be 0.5H, 0.55H, 0.6H, 0.65H, 0.7H, 0.75H, 0.8H, 0.85H, 0.9H or 0.95H.

[0121] It can be understood that when a recess 21 is provided on one side surface of the heat insulation member 20 along the first direction Z, the depth of the recess and the thickness of the heat insulation member 20 satisfy the above relationship; when recesses 21 are provided on both side surfaces of the heat insulation member 20 along the first direction Z, the sum of the depths of the recesses 21 on both side surfaces and the thickness of the heat insulation member 20 satisfy the above relationship. Optionally, the depths of the recesses 21 on both sides of the heat insulation member 20 may be the same or different.

[0122] In some alternative embodiments, please refer to Figure 6 , the dimension of the recess 21 in the width direction is 3 mm to 7 mm, which is beneficial to reducing the internal space of the recess 21 while reducing the manufacturing precision of the recess 21.

[0123] Exemplarily, the dimension of the recess 21 in the width direction can be K, and the value of K is 3 mm, 4 mm, 5 mm, 6 mm or 7 mm.

[0124] It can be understood that the width dimension refers to that the recess 21 has two side walls, and the dimension between the two side walls is the width dimension.

[0125] In some alternative embodiments, please refer to Figure 6 , the number of the recesses 21 includes a plurality, the distance between two adjacent recesses 21 is d, the dimension of the heat insulation member 20 in the direction in which two adjacent recesses 21 are arranged side by side is D, and the relationship between d and D satisfies 0.01D ≤ d ≤ 0.3D.

[0126] Exemplarily, a plurality of recesses 21 extend in the second direction X and are arranged at intervals in the third direction Y. The distance d between two recesses 21 in the third direction Y and the dimension D of the heat insulation member 20 in the third direction Y satisfy the relationship 0.01D ≤ d ≤ 0.3D.

[0127] Optionally, the distance between two adjacent recesses 21 can be 0.01D, 0.02D, 0.03D, 0.05D, 0.08D, 0.1D, 0.15D, 0.2D or 0.3D.

[0128] The embodiments of the present application are beneficial to improving the distribution density of the recesses 21, thereby improving the overall bending effect of the heat insulation member 20 and the fitting effect between the heat insulation member 20 and the battery cell 10.

[0129] Figure 10 is a schematic cross-sectional structure diagram of another heat insulation member provided by the embodiments of the present application. Figure 11 is a schematic cross-sectional structure diagram of another heat insulation member provided by the embodiments of the present application. Figure 12 is a schematic cross-sectional structure diagram of another heat insulation member provided by the embodiments of the present application. Figure 13 is a schematic cross-sectional structure diagram of another heat insulation member provided by the embodiments of the present application.

[0130] In some alternative embodiments, please refer to Figures 10 to 13, the heat insulation member 20 further includes a body portion 23 and a plurality of convex portions 22 located on the body portion, and a concave portion 21 is formed between two adjacent convex portions. Among them, the plurality of convex portions 22 include a first convex portion 221 and a second convex portion 222, a concave portion 21 is provided between the first convex portion 221 and the second convex portion 222, and the dimension of the first convex portion 221 in the first direction Z is greater than the dimension of the second convex portion 222 in the first direction Z.

[0131] Optionally, the body portion 23 and the concave portion 21 may be an integral structure.

[0132] Optionally, the convex portion 22 is located on the side of the body portion 23 facing the battery cell 10.

[0133] Optionally, the cross-sectional shape of the convex portion 22 may be trapezoidal, triangular or other shapes.

[0134] Optionally, the first convex portion 221 and the second convex portion 222 may be alternately arranged in a single direction. For example, a plurality of first convex portions 221 and a plurality of second convex portions 222 are alternately arranged in the third direction Y. Of course, a plurality of first convex portions 221 may also be arranged in sequence in a single direction, a plurality of second convex portions 222 are arranged in sequence in a single direction, and the first convex portion 221 and the second convex portion 222 are arranged adjacent to each other.

[0135] In these optional embodiments, by providing the first convex portion 221 and the second convex portion 222, it is beneficial to increase the gap between the battery cell 10 and the heat insulation member 20, thereby increasing the space in which the battery cell 10 can expand, and reducing the possibility of rupture caused by mutual extrusion between adjacent battery cells 10.

[0136] In some optional embodiments, please refer to Figures 11 to 13 , a concave portion 21 is provided between two adjacent first convex portions 221; and / or, a concave portion 21 is provided between two adjacent second convex portions 222.

[0137] In some examples, a concave portion 21 is provided between two adjacent first convex portions 221. In other examples, a concave portion 21 is provided between two adjacent second convex portions 222. In still other examples, a concave portion 21 is provided between two adjacent first convex portions 221, and a concave portion 21 is provided between two adjacent second convex portions 222.

[0138] Through the above settings in the embodiments of the present application, it is beneficial to increase the distribution density of the concave portion 21, thereby further improving the overall bending effect of the heat insulation member 20 and the fitting effect between the heat insulation member 20 and the battery cell 10.

[0139] In some optional embodiments, please refer to Figure 13, the recess 21 includes a first sub-recess 211 and a second sub-recess 212. The first sub-recess 211 is disposed between two adjacent first protrusions 221, and the second sub-recess 212 is disposed between two adjacent second protrusions 222. The bottom walls of the first sub-recess 211 and the second sub-recess 212 are flush with each other.

[0140] It can be understood that when the cross-sectional shape of the recess 21 is trapezoidal, the bottom wall can be a flat surface; when the cross-sectional shape of the recess 21 is V-shaped, the bottom wall can be a line segment.

[0141] In these alternative embodiments, through the above settings, it is beneficial to improve the uniformity of the bending angles of different regions of the heat insulation member 20 and improve the fitting effect between the heat insulation member 20 and the battery cell 10.

[0142] In some other embodiments, the recess 21 between the adjacent first protrusion 221 and the second protrusion 222 is a third sub-recess 213. The dimension of the first sub-recess 211 in the first direction Z is the same as the dimension of the second sub-recess 212 in the first direction Z, so that the first sub-recess 211 and the second sub-recess 212 can be formed by one manufacturing process, thereby reducing the manufacturing difficulty of the first sub-recess 211 and the second sub-recess 212. It should be noted that since the dimension of the first sub-recess 211 in the first direction Z is the same as the dimension of the second sub-recess 212 in the first direction Z, the bottom wall of the first sub-recess 211 is located on the side of the bottom wall of the second sub-recess 212 facing away from the body portion 23.

[0143] It can be understood that one of the two side walls of the third sub-recess 213 is the side wall of the first protrusion 221, and the other is the side wall of the second protrusion 222, so that the dimensions of the two side walls of the third sub-recess 213 in the first direction Z are different. Optionally, the bottom wall of the third sub-recess 213 is flush with the bottom wall of the second sub-recess 212. Of course, the bottom wall of the third sub-recess 213 and the bottom wall of the second sub-recess 212 may also be non-flush.

[0144] In some other embodiments, the dimension of the first sub-recess 211 in the first direction Z and the dimension of the second sub-recess 212 in the first direction Z may be the same.

[0145] Figure 14 is a schematic cross-sectional structure diagram of another heat insulation member provided by an embodiment of the present application.

[0146] In some alternative embodiments, please refer to Figure 14 , the heat insulation member 20 includes a first sub-heat insulation member 24 and two second sub-heat insulation members 25. The first sub-heat insulation member 24 is located between the two second sub-heat insulation members 25, and the recess 21 is disposed at least on the side of the second sub-heat insulation member 25 facing away from the first sub-heat insulation member 24.

[0147] Exemplarily, the heat insulation member 20 is composed of three sub heat insulation members. Among them, the first sub heat insulation member 24 is located between two second sub heat insulation members 25, and the concave portion 21 is provided on the surface of the second sub heat insulation member 25 facing away from the first sub heat insulation member 24, so that the concave portion 21 faces the battery cell 10. Optionally, the concave portion 21 may also be provided on the surface of the second sub heat insulation member 25 facing the first sub heat insulation member 24.

[0148] Optionally, the thickness of the first sub heat insulation member 24 and the thickness of the second sub heat insulation member 25 may be the same. Of course, they may also be different.

[0149] Optionally, the number of the first sub heat insulation members 24 may be one or more.

[0150] Exemplarily, when the number of the first sub heat insulation members 24 is multiple, the multiple first sub heat insulation members 24 are located between two second sub heat insulation members 25, and the multiple first sub heat insulation members 24 may be arranged in an array.

[0151] Optionally, the material of the first sub heat insulation member 24 and the material of the second sub heat insulation member 25 may be the same. Of course, they may also be different.

[0152] In the embodiment of the present application, through the above settings, it is beneficial to improve the heat absorption and heat insulation effects of the heat insulation member 20, while improving the overall bending effect of the heat insulation member 20 and reducing the possibility of the heat insulation member 20 breaking from the concave portion 21.

[0153] In some optional embodiments, please refer to Figure 10 , the first sub heat insulation member 24 includes an outer cladding layer 241 and a filling layer 242 covered by the outer cladding layer, and the filling layer includes a non-Newtonian fluid.

[0154] Optionally, a sealed space is formed in the outer cladding layer 241, and the filling layer 242 is located in the sealed space. The outer cladding layer 241 includes two first side walls arranged along the first direction Z, and the materials of the two first side walls may be elastic materials, and the first side walls can change the shape of the first side walls along with the flow of the non-Newtonian fluid.

[0155] It can be understood that non-Newtonian fluids have thixotropy. During the operation of the battery cell 10, the heat insulation member 20 is subjected to extrusion forces on both sides in the first direction Z. The extrusion forces on both sides can be regarded as a special shearing force. As the battery cell 10 expands and contracts repeatedly, the shearing force continues. Due to its own fluidity, the non-Newtonian fluid will flow towards the region with a smaller shearing force, leaving an expansion gap of the battery cell 10 at its original position to increase the expansion space of the battery cell 10. At the same time, this fluidity can make the heat insulation member 20 fit closely with the battery cell 10, reduce the gap space between the heat insulation member 20 and the battery cell 10, and improve the heat absorption and insulation effects of the heat insulation member 20. Moreover, non-Newtonian fluids also have the property of shear thickening. When the heat insulation member 20 is suddenly subjected to a strong external impact, the non-Newtonian fluid will harden, thereby reducing the possibility that a failed battery cell 10 affects a normally operating battery cell.

[0156] In some alternative embodiments, the filling layer 242 is an aqueous solution of acrylic acid, an aqueous solution of sodium polyacrylate, an aqueous solution of polyacrylamide, an aqueous solution of polyvinyl alcohol, an aqueous solution of methyl methacrylate, an aqueous solution of polyethylene oxide, or an aqueous solution of polygluconic acid, a starch suspension, a sand suspension, mud, a cellulose suspension, a diatomite suspension, a plastic particle suspension, a rubber particle suspension, or a powder coating, thereby expanding the applicable range of the heat insulation member 20 and reducing the preparation cost of the heat insulation member.

[0157] In some other embodiments, the second sub-heat insulation member 25 may also include an outer layer 241 and a filling layer 242, and the recess 21 is provided on the outer layer 241. Optionally, the material of the filling layer 242 of the second sub-heat insulation member 25 includes aerogel and PET (Polyethylene terephthalate) patches.

[0158] Figure 15 It is a schematic cross-sectional structure diagram of another heat insulation member provided by an embodiment of the present application.

[0159] In some alternative embodiments, please refer to Figure 15 , the heat insulation member 20 includes an accommodation space E1 located inside the heat insulation member, and the accommodation space is filled with a non-Newtonian fluid.

[0160] Exemplarily, the heat insulation member 20 may include an outer layer 241 and an accommodation space E1 enclosed by the outer layer, and the recess 21 is provided on the outer layer 241. Optionally, the heat insulation member 20 may include one or more accommodation spaces E1.

[0161] Through the above settings in the embodiments of the present application, it is beneficial to reduce the overall thickness of the heat insulation member while improving the buffering effect of the heat insulation member.

[0162] In a second aspect, an embodiment of the present application provides an electrical device, including the battery device 100 in any of the foregoing embodiments, and the battery device is used to provide electrical energy.

[0163] According to some embodiments of the present application, please refer to Figures 4 to 7 and Figure 13 and Figure 14 , the battery device 100 includes battery cells 10 and a heat insulation member 20. A plurality of battery cells are arranged along a first direction Z. The heat insulation member 20 is disposed between adjacent battery cells 10, and a plurality of recesses 21 are provided on a side of the heat insulation member 20 facing the battery cells.

[0164] Recesses 21 are provided on both sides of the heat insulation member 20 along the first direction Z. The heat insulation member 20 extends along a second direction X and penetrates a surface of the heat insulation member perpendicular to the first direction Z.

[0165] The heat insulation member 20 further includes a body portion 23 and a plurality of convex portions 22 located on the body portion, and a recess 21 is formed between two adjacent convex portions; wherein, the plurality of convex portions 22 include a first convex portion 221 and a second convex portion 222, a recess 21 is provided between the first convex portion and the second convex portion 222, and a dimension of the first convex portion 221 along the first direction Z is greater than a dimension of the second convex portion 222 along the first direction Z.

[0166] The heat insulation member 20 includes a first sub-heat insulation member 24 and two second sub-heat insulation members 25. The first sub-heat insulation member 24 is located between the two second sub-heat insulation members 25, and the recess 21 is provided at least on a side of the second sub-heat insulation member 25 facing away from the first sub-heat insulation member 24. An outer layer 241 of the first sub-heat insulation member and a filling layer 242 covered by the outer layer, and the filling layer includes a non-Newtonian fluid.

[0167] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should all be covered within the scope of the claims and the description of the present application. In particular, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, Comprising: A plurality of battery cells arranged in a first direction; A heat insulation member disposed between adjacent battery cells, and a plurality of concave portions are provided on a side of the heat insulation member facing the battery cells.

2. The battery device according to claim 1, wherein, The concave portions are provided on both sides of the heat insulation member in the first direction.

3. The battery device according to claim 1, wherein, At least some of the plurality of concave portions intersect.

4. The battery device according to claim 1, characterized in that, In a direction away from the battery cells, a cross-sectional area of the concave portion gradually decreases along a direction perpendicular to the first direction.

5. The battery device according to claim 1, characterized in that, A depth of the concave portion is h, and a thickness of the heat insulation member is H, and h and H satisfy a relationship: 0.5H ≤ h ≤ 0.95H.

6. The battery device according to claim 1, characterized in that, A dimension of the concave portion in a width direction is 3 mm to 7 mm.

7. The battery device according to claim 1, wherein The number of the concave portions includes a plurality, a spacing between adjacent two of the concave portions is d, and a dimension of the heat insulation member in a direction where adjacent two of the concave portions are arranged side by side is D, and d and D satisfy a relationship: 0.01D ≤ d ≤ 0.3D.

8. The battery device according to claim 1, characterized in that, The heat insulation member further includes a body portion and a plurality of convex portions located on the body portion, and the concave portion is formed between adjacent two of the convex portions; Wherein, the plurality of convex portions include a first convex portion and a second convex portion, the concave portion is provided between the first convex portion and the second convex portion, and a dimension of the first convex portion in the first direction is greater than a dimension of the second convex portion in the first direction.

9. The battery device according to claim 8, wherein, The concave portion is provided between adjacent two of the first convex portions; and / or The concave portion is provided between adjacent two of the second convex portions.

10. The battery device according to claim 9, characterized in that, The concave portion includes a first sub-concave portion and a second sub-concave portion, the first sub-concave portion is provided between adjacent two of the first convex portions, the second sub-concave portion is provided between adjacent two of the second convex portions, and a bottom wall of the first sub-concave portion and a bottom wall of the second sub-concave portion are flush.

11. The battery device according to any one of claims 1 to 10, characterized in that, The heat insulation member includes a first sub-heat insulation member and two second sub-heat insulation members, the first sub-heat insulation member is located between the two second sub-heat insulation members, and the concave portion is at least provided on a side of the second sub-heat insulation member facing away from the first sub-heat insulation member.

12. The battery device according to claim 11, wherein, The first sub-heat insulation member includes an outer cladding layer and a filling layer covered by the outer cladding layer, and the filling layer includes a non-Newtonian fluid.

13. The battery device according to claim 12, characterized in that, The filling layer is an aqueous solution of acrylic acid, an aqueous solution of sodium polyacrylate, an aqueous solution of polyacrylamide, an aqueous solution of polyvinyl alcohol, an aqueous solution of methyl methacrylate, an aqueous solution of polyethylene oxide, or an aqueous solution of gluconic acid, a starch suspension, a sand suspension, a mud, a cellulose suspension, a diatomite suspension, a plastic particle suspension, a rubber particle suspension, or a powder coating.

14. The battery device according to any one of claims 1 to 10, characterized in that, The heat insulation member includes an accommodation space located inside the heat insulation member, and the accommodation space is filled with a non-Newtonian fluid.

15. An electrical device, characterized in that, Including the battery device according to any one of claims 1 to 14, the battery device is used for providing electric energy.

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