Insulation structure, battery device and electrical equipment

Abstract

The present application discloses a heat preservation structure, a battery device and an electric device, which relate to the field of battery technology. The battery device comprises a battery box, a plurality of battery cells arranged in the battery box, and a heat preservation structure installed on the battery box; wherein the heat preservation structure comprises a vacuum plate, the vacuum plate comprises a core material and a protective layer, the protective layer forms a vacuum cavity, and the vacuum cavity is filled with the core material. The technical solution provided by the present application can improve the heat preservation performance of the battery device under low temperature conditions.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a thermal insulation structure, a battery device and electrical equipment. Background Art

[0002] With the popularity of electric vehicles, people have higher and higher requirements for the endurance of electric vehicle power batteries. At present, the endurance of power batteries is generally lower than that under normal conditions due to the influence of external low temperature conditions, especially in northern regions, which seriously affects consumers' travel experience.

[0003] In the related art, thermal insulation foam is usually attached to the inner wall or outer wall of the battery box. However, the thermal insulation foam has limited effect on the thermal insulation of the battery device under low temperature conditions. Utility Model Content

[0004] In view of the above problems, the present application provides a thermal insulation structure, a battery device and an electrical equipment, aiming to improve the thermal insulation performance of the battery device under low temperature conditions.

[0005] The present application provides a battery device, including a battery case, a plurality of battery cells arranged in the battery case, and a thermal insulation structure installed on the battery case; wherein the thermal insulation structure includes a vacuum plate, the vacuum plate includes a core material and a protective layer, the protective layer forms a vacuum cavity, and the vacuum cavity is filled with the core material.

[0006] In the technical solution of the embodiment of the present application, the technical solution of the present application is to install a thermal insulation structure on the battery box, wherein the thermal insulation structure is a vacuum panel, which is also called a vacuum insulation panel. By using the principle of vacuum insulation, the core material with good thermal insulation performance is loaded into the air-insulating structure of the protective layer, and then sealed after vacuuming, the convection effect can be effectively eliminated, and the thermal conductivity can be greatly reduced, so that the thermal conductivity of the vacuum panel is low. Therefore, the use of the thermal insulation structure of this solution can improve the thermal insulation performance of the battery device under low temperature conditions. In addition, by using a protective layer to protect the core material, the sealing performance and resistance to foreign body puncture of the core material can be improved to protect the thermal insulation and insulation effects of the core material, thereby extending the service life of the thermal insulation structure.

[0007] In some embodiments, the core material includes a fiber member, a getter and a desiccant. In this design, the fiber member, the getter and the desiccant are used to form the core material, so that the core material is placed in a vacuum environment by the getter, and the humidity of the fiber member is reduced by the desiccant to further reduce the heat exchange between the core material and the outside, so that the core material has better heat preservation and insulation effects.

[0008] In some embodiments, the protective layer includes a sealing layer, a sealing layer, a toughening layer, and an anti-puncture layer; the sealing layer wraps the core material; the sealing layer wraps the sealing layer; the toughening layer wraps the sealing layer; and the anti-puncture layer wraps the toughening layer. Such a design can improve the thermal insulation performance of the vacuum panel by arranging the sealing layer, the sealing layer, the toughening layer, and the anti-puncture layer on the outside of the core material from the inside to the outside, and give the vacuum panel better resistance to foreign body puncture, thereby effectively extending the service life of the vacuum panel.

[0009] In some embodiments, the periphery of the protective layer includes an edge seal, which is located outside the periphery of the core material. With this design, after the sealing layer, the sealing layer, the toughening layer, and the puncture-proof layer are installed from the inside to the outside of the core material, the periphery of the sealing layer, the sealing layer, the toughening layer, and the puncture-proof layer is sealed, which can improve the connection reliability between the layers in the protective layer and improve the connection reliability between the protective layer and the core material.

[0010] In some embodiments, the battery device further includes at least two end plates disposed opposite to each other in the battery case, and a plurality of battery cells are disposed between the two end plates; wherein a heat preservation structure is installed between the battery cell and the end plate, inside the end plate, or at least one of the inner wall or outer wall of the battery case. Such a design, by installing a heat preservation structure between the battery cell and the end plate, inside the end plate, or at least one of the inner wall or outer wall of the battery case, uses the heat preservation structure to achieve the effect of heat preservation and insulation at various positions, which can effectively improve the heat preservation performance of the battery device under low temperature conditions.

[0011] In some embodiments, the heat preservation structure further includes a foam layer, which is disposed on the surface of the vacuum plate. Such a design of the foam layer can not only make the heat preservation structure have better heat preservation and insulation functions, but also provide a buffering effect for the battery cells in the working state, and at the same time prevent the vacuum plate from being punctured by metal foreign objects introduced during the assembly process or remaining inside the battery device, thereby losing the heat preservation and insulation functions.

[0012] In some embodiments, the vacuum plate has two plate surfaces arranged opposite to each other, both plate surfaces are provided with foam layers, the vacuum plate and the two foam layers constitute a sandwich layer composite structure, the sandwich layer composite structure is arranged between the battery cell and the end plate, or the sandwich layer composite structure is embedded in the end plate. In such a design, since the sandwich layer composite structure is provided with two layers of foam layers, the buffering capacity of the sandwich layer composite structure can be better, and at the same time, both plate surfaces of the vacuum plate can be protected from puncture by the corresponding foam layers. Therefore, by providing a sandwich layer composite structure between the battery cell and the end plate, or by embedding the sandwich layer composite structure in the end plate, a better buffering effect can be provided to the battery cell in the working state, and at the same time, the vacuum plate can be better prevented from being punctured by metal foreign bodies introduced during the assembly process or remaining inside the battery device.

[0013] In some embodiments, when the sandwich layer composite structure is disposed between the battery cell and the end plate, the periphery of the foam layer protrudes from the periphery of the vacuum plate. With such a design, when the sandwich layer composite structure is installed between the battery cell and the end plate, the sandwich layer composite structure will rub against the blue film of the battery cell. Since the vacuum plate of the sandwich layer composite structure is relatively hard, by making the periphery of the foam layer of the sandwich layer composite structure protrude from the periphery of the vacuum plate, the edge sealing of the periphery of the vacuum plate will not protrude from the periphery of the foam layer, which can prevent the edge sealing of the periphery of the vacuum plate from leaking out and causing the blue film of the battery cell to be scratched during the assembly process.

[0014] In some embodiments, a glue layer is provided between the battery cell and the side of one foam layer away from the vacuum plate, and a glue layer is provided between the side of the other foam layer away from the vacuum plate and the end plate. This design can improve the installation reliability of the sandwich layer composite structure by fixing the sandwich layer composite structure between the battery cell and the end plate by gluing the glue layer, and avoid the phenomenon of position displacement or even falling caused by shaking during the operation of the equipment.

[0015] In some embodiments, when the sandwich composite structure is embedded in the end plate, the periphery of the vacuum plate protrudes from the periphery of the foam layer. Such a design, by making the periphery of the vacuum plate protrude from the periphery of the foam layer, that is, the periphery of the foam layer is lower than the periphery of the vacuum plate, can make the overall thickness of the sandwich composite structure smaller than the thickness of the front and rear ends of the cavity inside the end plate, and can avoid the problem of jamming or failure to embed in the process of embedding in the end plate due to the overall thickness of the sandwich composite structure and the height of the foam layer, so that the sandwich composite structure can be smoothly embedded in the cavity of the end plate.

[0016] In some embodiments, a cavity is formed in the end plate, the sandwich layer composite structure is arranged in the cavity, a groove is arranged on the side wall of the cavity, and the edge seal of the vacuum panel periphery at least partially extends into the groove. In such a design, since the periphery of the vacuum panel protrudes from the periphery of the foam layer, by arranging the groove on the side wall of the cavity, when the sandwich layer composite structure is embedded in the end plate, the edge seal of the vacuum panel periphery that is relatively protruding can at least partially extend into the groove, so that the groove is used to accommodate the edge seal of the vacuum panel periphery that is relatively protruding, so as to meet the assembly requirements and avoid the phenomenon that the edge seal of the vacuum panel periphery that is relatively protruding and the end plate are scratched or stuck.

[0017] In some embodiments, the sealing edge and the groove are clearance-matched. With this design, when the sandwich layer composite structure is embedded in the end plate, the sealing plate at the periphery of the vacuum panel can be smoothly inserted into the groove to achieve normal assembly, thereby reducing the risk of the sealing plate at the periphery of the vacuum panel rubbing against the groove wall of the groove.

[0018] In some embodiments, the end plate has a length direction, and the end surface of the end plate in the length direction is provided with a mounting opening connecting the cavity and the groove, and the end surface of the end plate in the length direction is also provided with a plugging piece, and the plugging piece is used to plug the mounting opening. With such a design, the sandwich layer composite structure can be smoothly embedded in the cavity of the end plate from the mounting opening, and after the installation is completed, the mounting opening is blocked by the plugging piece, which can prevent the sandwich layer composite structure from being separated from the mounting opening due to tilting or vibration of the equipment during operation.

[0019] In some embodiments, a foam layer is provided on one surface of the vacuum plate, and the vacuum plate and the foam layer form a single-layer composite structure, which is provided on the inner wall or outer wall of the battery box. With such a design, the single-layer composite structure can reduce the overall thickness of the thermal insulation structure. When the single-layer composite structure is provided on the inner wall of the battery box, the space occupied by the thermal insulation structure on the inner side of the battery box can be reduced, and more space can be provided to install battery cells to improve the volume energy density; and when the single-layer composite structure is provided on the outer wall of the battery box, the overall volume of the battery device can be reduced.

[0020] In some embodiments, a mounting groove is provided on one side of the foam layer, the vacuum plate is provided in the mounting groove, and a glue layer is provided between the side of the vacuum plate exposed in the notch of the mounting groove and the outer wall of the battery case. Such a design may experience gravel impact, water flow impact and other phenomena due to the complex external environment conditions. Therefore, by installing the vacuum plate in the mounting groove of the foam layer, the protective effect of the vacuum plate can be improved. In addition, by fixing the single-layer composite structure to the inner wall or outer wall of the battery case by gluing the adhesive layer, the installation reliability of the single-layer composite structure can be improved.

[0021] In some embodiments, an adhesive layer is provided between the vacuum plate and the foam layer. Such a design can improve the connection reliability between the foam layer and the vacuum plate by fixing the foam layer on the vacuum plate by gluing the foam layer.

[0022] The present application also provides a thermal insulation structure, which is configured to be installed on a battery box, and the thermal insulation structure includes a vacuum plate, the vacuum plate includes a core material and a protective layer, the protective layer forms a vacuum cavity, and the vacuum cavity is filled with the core material.

[0023] The present application also provides an electrical device, comprising the above-mentioned battery device.

[0024] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, which can be implemented in accordance with the contents of the specification, and to make other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0026] Figure 1 This is a schematic diagram of the structure of the vacuum panel in one embodiment of the thermal insulation structure of the present application;

[0027] Figure 2 A side view of an embodiment of the thermal insulation structure of the present application;

[0028] Figure 3 for Figure 2 A top view of the

[0029] Figure 4 A side view of another embodiment of the thermal insulation structure of the present application assembled with an end plate;

[0030] Figure 5 A side view of another embodiment of the thermal insulation structure of the present application;

[0031] Figure 6 for Figure 5 Bottom view in

[0032] Figure 7 A side view of another embodiment of the thermal insulation structure of the present application;

[0033] Figure 8 An exploded view of an embodiment of a battery device of the present application;

[0034] Fig. 9 This is a schematic structural diagram of a vehicle according to an embodiment of the present application.

[0035] Description of Figure Numbers:

[0036]

[0037] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0039] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0040] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0041] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0042] In the description of the embodiments of the present application, the term "multiple" 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).

[0043] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or component must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0044] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two components or the interaction relationship between two components. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0045] The battery device mentioned in this field is also called a battery. It can be divided into disposable batteries and rechargeable batteries according to whether it is rechargeable. The common types of rechargeable batteries are: lead-acid batteries, nickel-metal hydride batteries and lithium-ion batteries. Lithium-ion batteries are currently widely used in pure electric vehicles and hybrid vehicles. The capacity of lithium-ion batteries used for this purpose is relatively low, but they have larger output and charging current, and also have a longer service life, but the cost is higher.

[0046] The battery described in the embodiments of the present application refers to a rechargeable battery. The embodiments disclosed in the present application will be described below mainly by taking a lithium-ion battery as an example. It should be understood that the embodiments disclosed in the present application are applicable to any other appropriate type of rechargeable battery. The battery mentioned in the embodiments disclosed in the present application can be directly or indirectly applied to an appropriate device to power the device.

[0047] The battery mentioned in the embodiments disclosed in this application refers to a single physical module including one or more battery cells to provide a predetermined voltage and capacity. Battery cells are the basic units in the battery, and can generally be divided into: cylindrical battery cells, rectangular battery cells and soft-pack battery cells according to the packaging method. The following will mainly focus on rectangular battery cells. It should be understood that the embodiments described below are also applicable to cylindrical battery cells or soft-pack battery cells in some aspects.

[0048] A battery cell includes a positive electrode sheet, a negative electrode sheet, an electrolyte and a separator. Lithium-ion battery cells mainly rely on the movement of lithium ions between the positive electrode sheet and the negative electrode sheet to work. In cylindrical battery cells, the film structure of three layers of material is wound into a cylindrical electrode assembly, while in rectangular battery cells, the film structure is wound or stacked into an electrode assembly with a roughly rectangular shape.

[0049] In a common battery cell structure, the battery cell includes a shell, an electrode assembly and an electrolyte. The electrode assembly is contained in the shell of the battery cell, and the electrode assembly includes a positive electrode sheet, a negative electrode sheet and a separator. The shell includes a shell and an end cap. The shell includes a housing formed by a plurality of walls and an opening. The end cap is arranged at the opening to close the housing chamber. In addition to the electrode assembly, the housing chamber also contains an electrolyte. The positive electrode sheet and the negative electrode sheet in the electrode assembly include tabs. In order to avoid passing a large current without melting, the number of positive tabs is multiple and stacked together, and the number of negative tabs is multiple and stacked together. The tabs are electrically connected to the electrode terminals located outside the battery cell through connecting members, and the electrode terminals generally include a positive electrode terminal and a negative electrode terminal. For a rectangular battery cell, the electrode terminal is generally arranged at the end cap portion. A plurality of battery cells are connected in series and / or in parallel via the electrode terminals for application in various applications.

[0050] In some high-power applications such as electric vehicles, the application of batteries includes three levels: battery cells, battery modules and batteries. The battery module is formed by electrically connecting a certain number of battery cells together and placing them in a frame in order to protect the battery cells from external impact, heat, vibration, etc. The battery refers to the final state of the battery system installed in the electric vehicle. The battery generally includes a battery box for encapsulating one or more battery cells.

[0051] In recent years, new energy vehicles have developed by leaps and bounds. In the field of electric vehicles, power batteries, as the power source of electric vehicles, play an irreplaceable and important role. The battery consists of a battery box and multiple battery cells contained in the battery box. Among them, batteries, as core components of new energy vehicles, have high requirements in terms of safety. At present, the mechanical safety of power batteries during use is one of the battery safety issues that consumers generally care about.

[0052] The battery provided in the embodiment of the present application can be a power source for electric devices. The electric devices can be mobile phones, portable devices, laptop computers, battery cars, electric cars, ships, spacecraft, electric toys and electric tools, etc. For example, spacecraft include airplanes, rockets, space shuttles and spacecrafts, etc. Electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys and electric airplane toys, etc. Electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators and electric planers.

[0053] For the convenience of description, the following embodiments are described by taking a vehicle 1000 as an example of an electrical device according to an embodiment of the present application.

[0054] For example, Fig. 9This is a structural diagram of an embodiment of a vehicle 1000 of the present application. The vehicle 1000 may be a fuel vehicle, a gas vehicle or a new energy vehicle. The new energy vehicle may be a pure electric vehicle, a hybrid vehicle or an extended range vehicle, etc. A battery device 100, a controller 200 and a motor 300 may be provided inside the vehicle 1000. The controller 200 is used to control the battery device 100 to power the motor 300. For example, a battery device 100 may be provided at the bottom, front or rear of the vehicle 1000. The battery device 100 may be used to power the vehicle 1000. For example, the battery device 100 may be used as an operating power source for the vehicle 1000, for the circuit system of the vehicle 1000, for example, for the working power demand during the start, navigation and operation of the vehicle 1000. In another embodiment of the present application, the battery device 100 may not only be used as an operating power source for the vehicle 1000, but also as a driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0055] For example, see Figure 8 , Figure 8 An exploded view of the structure of a battery device 100 provided for some embodiments of the present application. The battery device 100 includes a battery case 10 and a battery cell 20, and the battery case 10 has a storage space for accommodating the battery cell 20. Among them, the battery case 10 can adopt a variety of structures. In some embodiments, the battery case 10 may include a first part 10a and a second part 10b, the first part 10a and the second part 10b cover each other, and the first part 10a and the second part 10b jointly define a storage space for accommodating the battery cell 20. The second part 10b may be a hollow structure with one end open, the first part 10a may be a plate-like structure, and the first part 10a covers the open side of the second part 10b, so that the first part 10a and the second part 10b jointly define a storage space; the first part 10a and the second part 10b may also be hollow structures with one side open, and the open side of the first part 10a covers the open side of the second part 10b. Of course, the battery box 11 formed by the first part 10a and the second part 10b can be in various shapes, such as a cylinder, a cuboid, etc.

[0056] In the battery device 100, there can be one or more battery cells 20. When the battery device 100 has multiple battery cells 20, the multiple battery cells 20 can be connected in series, in parallel, or in mixed connection. Mixed connection means that the multiple battery cells 20 are both connected in series and in parallel. The multiple battery cells 20 can be directly connected in series, in parallel, or in mixed connection, and then the whole formed by the multiple battery cells 20 is accommodated in the battery box 10; of course, the battery device 100 can also be a battery module formed by connecting multiple battery cells 20 in series, in parallel, or in mixed connection, and then the multiple battery modules are connected in series, in parallel, or in mixed connection to form a whole, and accommodated in the battery box 10.

[0057] With the popularity of electric vehicles, people have higher and higher requirements for the endurance of electric vehicle power batteries. At present, the endurance of power batteries is generally lower than that under normal conditions due to the influence of external low temperature conditions, especially in northern regions, which seriously affects consumers' travel experience.

[0058] In the related art, thermal insulation foam is usually attached to the inner wall or outer wall of the battery box. However, the thermal insulation foam has limited effect on the thermal insulation of the battery device under low temperature conditions.

[0059] Based on the above problems, the present application proposes a battery device 100, which aims to improve the thermal insulation performance of the battery device 100 under low temperature conditions. The battery device 100 is described in detail below with reference to specific drawings and embodiments.

[0060] See also Figures 1 to 7 In one embodiment of the present application, the battery device 100 includes a battery case 10, a plurality of battery cells 20 disposed in the battery case 10, and a thermal insulation structure 40 installed on the battery case 10; wherein the thermal insulation structure 40 includes a vacuum plate 41, the vacuum plate 41 includes a core material 411 and a protective layer 412, the protective layer 412 forms a vacuum cavity, and the core material 411 is filled in the vacuum cavity.

[0061] In some embodiments, the battery device 100 may further include at least two oppositely disposed end plates 30 disposed in the battery case 10, and a plurality of battery cells 20 are disposed between the two end plates 30; wherein, a heat preservation structure 40 is installed between the battery cell 20 and the end plate 30, inside the end plate 30, or at least one of the inner wall or outer wall of the battery case 10. By installing the heat preservation structure 40 between the battery cell 20 and the end plate 30, inside the end plate 30, or at least one of the inner wall or outer wall of the battery case 10, the heat preservation structure 40 is used to achieve the effect of heat preservation and insulation at various positions, which can effectively improve the heat preservation performance of the battery device 100 under low temperature conditions.

[0062] The end plate 30 refers to a structure used to support the end battery cells 20 in a plurality of battery cells 20. For example, during the assembly process, after arranging a plurality of battery cells 20 in the same direction, two end plates 30 are respectively provided on the outside of the two end battery cells 20, so that the two end battery cells 20 are positioned and fixed by the two end plates 30. The end plate 30 can be formed by extrusion or injection molding, and the material can be metal, plastic or composite material. In some embodiments, a heat preservation structure 40 can be provided between the end plate 30 and the battery cell 20 adjacent thereto. When the space between the end plate 30 and the battery cell 20 is small and insufficient to provide the heat preservation structure 40, the heat preservation structure 40 can also be embedded in the inside of the end plate 30, so that the heat exchange between the end battery cell 20 and the end plate 30 can be reduced in a low temperature environment, so as to reduce the temperature difference between the end battery cell 20 and the adjacent battery cell 20, thereby improving the service life of the end battery cell 20. It should be noted that the end battery cell 20 refers to the battery cell 20 located at the outermost side of a plurality of battery cells 20.

[0063] In other embodiments, the battery device 100 usually needs to be heated in a low temperature environment to maintain the performance and safety of the battery device 100. An insulation structure 40 can be set on the inner wall or outer wall of the battery box 10. The insulation structure 40 can insulate the battery cells 20 inside the battery box 10 to reduce the heating time of the battery cells 20.

[0064] The vacuum panel 41 of the insulation structure 40 is used to insulate the battery cell 20 or reduce the heat exchange between the end battery cell 20 and the end plate 30. The vacuum panel 41 uses the principle of vacuum insulation. By loading the core material 411 with good insulation performance into the air-insulating structure of the protective layer 412, and then sealing it after vacuuming, it can effectively eliminate the convection effect and greatly reduce the thermal conductivity. In addition, the vacuum panel 41 has an extremely low thermal conductivity, which can be reduced to less than 1 / 10 of the traditional insulation material, and has the advantages of thin insulation layer thickness, small volume and light weight. In addition, the vacuum panel 41 does not contain any ozone-depleting substances and is an environmentally friendly material. The core material 411 refers to the structure located in the middle of the vacuum panel 41, which has the effect of heat preservation and insulation. The protective layer 412 refers to a structure used to protect the core material 411, for example, it can improve the sealing performance of the core material 411 and the resistance to foreign body puncture.

[0065] In actual application, the heat preservation structure 40 may be provided only between the battery cell 20 and the end plate 30, inside the end plate 30, or on the inner wall or outer wall of the battery box 10, or may be provided on any two or all positions. Moreover, the specific structures of the heat preservation structures 40 provided at different positions may be the same or different.

[0066] In summary, in the technical solution of the embodiment of the present application, the technical solution of the present application is to install a heat preservation structure 40 on the battery box 10, wherein the heat preservation structure 40 is a vacuum plate 41, which is also called a vacuum insulation plate. By using the principle of vacuum insulation, the core material 411 with good heat insulation performance is loaded into the air-insulating structure of the protective layer 412, and then sealed after vacuuming, the convection effect can be effectively eliminated, and the thermal conductivity can be greatly reduced, so that the thermal conductivity of the vacuum plate 41 is low, which can reach 3.5mW / (m·K). Therefore, the use of the heat preservation structure 40 of this solution can improve the heat preservation performance of the battery device 100 under low temperature conditions. In addition, by using the protective layer 412 to protect the core material 411, the sealing performance, resistance to foreign body puncture and other properties of the core material 411 can be improved to protect the heat preservation and insulation effects of the core material 411, thereby extending the service life of the heat preservation structure 40.

[0067] See also Figure 1 In one embodiment of the present application, the core material 411 includes a fiber member, a getter and a desiccant.

[0068] The fiber piece can be a glass fiber piece or a ceramic fiber piece; the getter is dispersed in the fiber piece; and the desiccant is dispersed in the fiber piece.

[0069] The fiber piece is the main carrier of the core material 411. Getter is a general term for preparations or devices that can effectively absorb certain (kinds of) gas molecules, and are used to obtain and maintain vacuum and purify gas on the fiber piece. There are many forms such as powder, disc, belt, tube, ring, cup, etc. For example, the getter can be calcium oxide. Desiccant refers to a substance that can remove part of the moisture in the fiber piece, such as calcium sulfate and calcium chloride, which dry by combining with water to form hydrates; and silica gel and activated alumina, which dry by physically adsorbing water.

[0070] Such a design, by using fiber parts, getters and desiccants to form the core material 411, so that the core material 411 is placed in a vacuum environment through the getter, and the humidity of the fiber parts is reduced through the desiccant, so as to further reduce the heat exchange between the core material 411 and the outside world, so that the core material 411 can have better thermal insulation and heat preservation effects.

[0071] See also Figure 1 In one embodiment of the present application, the protective layer 412 includes a sealing layer 4121, a sealing layer 4122, a toughening layer 4123 and an anti-puncture layer 4124; the sealing layer 4121 wraps the core material 411; the sealing layer 4122 wraps the sealing layer 4121; the toughening layer 4123 wraps the sealing layer 4122; and the anti-puncture layer 4124 wraps the toughening layer 4123.

[0072] The sealing layer 4121 can give the protective layer 412 a sealing function so as to seal the core material 411. Exemplarily, the sealing layer 4121 can be a PE (polyethylene) film material or a PP (polypropylene) film material.

[0073] The sealing layer 4122 can give the protective layer 412 a function of high airtightness so as to seal the core material 411. Exemplarily, the sealing layer 4122 can be aluminum foil.

[0074] The toughening layer 4123 can give the protective layer 412 a higher toughness function to prevent the protective layer 412 from breaking during the pulling process. Exemplarily, the toughening layer 4123 can be a PET (Polyethylene terephthalate) film material.

[0075] The puncture-proof layer 4124 can give the protective layer 412 a foreign body puncture-resistant function, preventing foreign metal objects introduced during assembly or remaining inside the battery device 100 from puncturing the protective layer 412. Exemplarily, the puncture-proof layer 4124 can be a PA (Polyamide, commonly known as nylon) film material.

[0076] Such a design, by arranging a sealing layer 4121, a sealing layer 4122, a toughening layer 4123 and an anti-puncture layer 4124 on the outer side of the core material 411 from the inside to the outside, can improve the thermal insulation performance of the vacuum panel 41 and give the vacuum panel 41 better resistance to foreign body puncture, thereby effectively extending the service life of the vacuum panel 41.

[0077] See also Figure 1 In one embodiment of the present application, the periphery of the protective layer 412 includes a sealed edge 412 a , and the sealed edge 412 a is located outside the periphery of the core material 411 .

[0078] The edge seal 412a refers to the connection position formed by heat sealing at the periphery of the protective layer 412 (sealing layer 4121, sealing layer 4122, toughening layer 4123 and puncture-proof layer 4124). The width of the heat seal can be determined according to the actual use situation and is not specifically limited here.

[0079] With such a design, after the sealing layer 4121, the sealing layer 4122, the toughening layer 4123 and the anti-puncture layer 4124 are respectively installed on the outside of the core material 411 from the inside to the outside, the edges of the sealing layer 4121, the sealing layer 4122, the toughening layer 4123 and the anti-puncture layer 4124 are sealed 412a, which can improve the connection reliability between the layers in the protective layer 412 and improve the connection reliability between the protective layer 412 and the core material 411.

[0080] See also Figures 2 to 7 In one embodiment of the present application, the thermal insulation structure 40 further includes a foam layer 42 , and the foam layer 42 is disposed on the surface of the vacuum plate 41 .

[0081] The foam layer 42 refers to a layered structure composed of foam material. The foam layer 42 can be made of a material based on PE or PP, and the foaming method can be selected from microporous injection molding foaming, continuous extrusion foaming, chemical cross-linking foaming, and electron irradiation cross-linking foaming; the foam material can also be made of a material based on silicone rubber or polyurethane, and the foaming method can be selected from chemical foaming, chemical reaction foaming, physical foaming (intermittent foaming), etc. The foaming ratio and compression performance of the foam layer 42 are specifically defined by the buffering performance requirements that the thermal insulation structure 40 needs to have. In actual application, the foam layer 42 can be set on each surface of the vacuum plate 41, or the foam layer 42 can be set on part of the surface of the vacuum plate 41.

[0082] With such a design, the design of the foam layer 42 can make the thermal insulation structure 40 not only have better thermal insulation and heat isolation functions, but also provide a buffering effect for the battery cell 20 in the working state, and at the same time prevent the vacuum plate 41 from being punctured by metal foreign objects introduced during the assembly process or remaining inside the battery device 100, thereby losing the thermal insulation and heat isolation functions.

[0083] See also Figures 2 to 4 In one embodiment of the present application, the vacuum plate 41 has two plate surfaces arranged opposite to each other, and both plate surfaces are provided with foam layers 42. The vacuum plate 41 and the two foam layers 42 constitute a sandwich layer composite structure 40a. The sandwich layer composite structure 40a is arranged between the battery cell 20 and the end plate 30, or the sandwich layer composite structure 40a is embedded in the end plate 30.

[0084] It should be noted that the vacuum plate 41 has six surfaces, of which the two largest surfaces are the two plate surfaces of the vacuum plate 41 , and the remaining four surfaces connecting the two plate surfaces are the peripheral side surfaces of the vacuum plate 41 .

[0085] The sandwich layer composite structure 40a includes at least three layers of layered structures stacked in sequence, wherein the vacuum panel 41 serves as the sandwich layer, and the foam layers 42 located on both sides of the vacuum panel 41 serve as the surface layers.

[0086] When there is enough space between the end plate 30 and the end battery cell 20, the sandwich layer composite structure 40a can be installed between the battery cell 20 and the end plate 30; when there is not enough space between the end plate 30 and the end battery cell 20 to install the sandwich layer composite structure 40a, the sandwich layer composite structure 40a can be embedded in the end plate 30.

[0087] With such a design, since the sandwich layer composite structure 40a is provided with two foam layers 42, the buffering capacity of the sandwich layer composite structure 40a can be improved, and at the same time, the two plate surfaces of the vacuum plate 41 can be protected against puncture by the corresponding foam layers 42. Therefore, by arranging the sandwich layer composite structure 40a between the battery cell 20 and the end plate 30, or embedding the sandwich layer composite structure 40a in the end plate 30, a better buffering effect can be provided to the battery cell 20 in the working state, and at the same time, the vacuum plate 41 can be better prevented from being punctured by metal foreign objects introduced during the assembly process or remaining inside the battery device 100.

[0088] See also Figure 3 In one embodiment of the present application, when the sandwich layer composite structure 40 a is disposed between the battery cell 20 and the end plate 30 , the periphery of the foam layer 42 protrudes beyond the periphery of the vacuum plate 41 .

[0089] With such a design, during the process of installing the sandwich layer composite structure 40a between the battery cell 20 and the end plate 30, the sandwich layer composite structure 40a may scratch the blue film of the battery cell 20. Since the vacuum plate 41 of the sandwich layer composite structure 40a is relatively hard, the periphery of the foam layer 42 of the sandwich layer composite structure 40a is made to protrude from the periphery of the vacuum plate 41 so that the sealed edge 412a at the periphery of the vacuum plate 41 will not protrude from the periphery of the foam layer 42. This can prevent the sealed edge 412a at the periphery of the vacuum plate 41 from leaking out and scratching the blue film of the battery cell 20 during the assembly process.

[0090] See also Figure 3 In one embodiment of the present application, a glue layer 43 is provided between a side of a foam layer 42 away from the vacuum plate 41 and the battery cell 20 , and a glue layer 43 is provided between a side of another foam layer 42 away from the vacuum plate 41 and the end plate 30 .

[0091] During assembly, adhesive can be applied on one side of a foam layer 42 away from the vacuum plate 41 and on the other side of another foam layer 42 away from the vacuum plate 41, and the sandwich layer composite structure 40a is placed between the battery cell 20 and the end plate 30, and the adhesive layer 43 is formed after the adhesive is cooled. The adhesive can be a pressure-sensitive double-sided adhesive, a structural adhesive, or a curing adhesive. The pressure-sensitive double-sided adhesive can be a substrate or a substrate-free type, and the adhesive is an acrylate; the structural adhesive can be a polyurethane or epoxy resin; the curing adhesive can be an acrylate or epoxy resin. Before pasting the sandwich layer composite structure 40a to the battery cell 20 and the end plate 30, the pasting surface of the foam layer 42 needs to be cleaned to ensure that the surface energy and roughness meet the requirements, and no impurities are allowed on the surface.

[0092] Such a design, by fixing the sandwich composite structure 40a between the battery cell 20 and the end plate 30 by gluing with the adhesive layer 43, can improve the installation reliability of the sandwich composite structure 40a and avoid the phenomenon of position displacement or even falling caused by shaking during the operation of the equipment.

[0093] See also Figure 4 In another embodiment of the present application, when the sandwich layer composite structure 40 a is embedded in the end plate 30 , the periphery of the vacuum panel 41 protrudes beyond the periphery of the foam layer 42 .

[0094] Such a design, by making the periphery of the vacuum plate 41 protrude beyond the periphery of the foam layer 42, that is, the periphery of the foam layer 42 is lower than the periphery of the vacuum plate 41, can make the overall thickness of the sandwich layer composite structure 40a smaller than the thickness of the front and rear ends of the internal cavity 31 of the end plate 30, and can avoid the problem of the sandwich layer composite structure 40a being too thick as a whole and the foam layer 42 being too high, which would cause jamming or failure to embed in the process of embedding in the end plate 30, so that the sandwich layer composite structure 40a can be smoothly embedded in the cavity 31 of the end plate 30.

[0095] See also Figure 4 In another embodiment of the present application, a cavity 31 is formed in the end plate 30, the sandwich layer composite structure 40a is arranged in the cavity 31, the side wall of the cavity 31 is provided with a groove 32, and the sealing edge 412a around the vacuum panel 41 at least partially extends into the groove 32.

[0096] With such a design, since the periphery of the vacuum panel 41 protrudes beyond the periphery of the foam layer 42, by providing a groove 32 on the side wall of the cavity 31, when the sandwich layer composite structure 40a is embedded in the end plate 30, the relatively protruding edge seal 412a of the vacuum panel 41 can be at least partially extended into the groove 32, so that the groove 32 can be used to accommodate the relatively protruding edge seal 412a of the vacuum panel 41 to meet the assembly requirements, and can avoid the relatively protruding edge seal 412a of the vacuum panel 41 from scratching or getting stuck with the end plate 30.

[0097] In some embodiments, the groove 32 may be a through hole extending through the front and rear ends of the end plate 30 , which makes it easier to embed the sandwich composite structure 40 a into the cavity 31 of the end plate 30 .

[0098] In some embodiments, the groove 32 can be arranged on the upper and lower ribs of the end plate 30 to prevent the local strength of the end plate 30 from being too low due to the design of the groove 32. The upper and lower ribs refer to the reinforcing ribs installed on the upper and lower sides of the end plate 30, which play a role in strengthening the end plate 30.

[0099] See also Figure 4 In another embodiment of the present application, the edge seal 412 a is clearance-matched with the groove 32 .

[0100] With this design, when the sandwich layer composite structure 40a is embedded in the end plate 30, the sealing plate at the periphery of the vacuum panel 41 can be smoothly inserted into the groove 32 for normal assembly, thereby reducing the risk of scratches between the sealing plate at the periphery of the vacuum panel 41 and the groove wall of the groove 32.

[0101] In some embodiments, the depth of the groove 32 can be less than 10% of the thickness of the ribs of the end plate 30, and the width of the groove 32 can be 105% to 110% of the thickness of the edge sealing 412a around the protective layer 412 in the vacuum panel 41. In this way, the problem of low local strength of the end plate 30 can be avoided, while ensuring that the sandwich layer composite structure 40a can be smoothly embedded in the cavity 31 and the groove 32 to achieve normal assembly, so as to prevent cracking of the ribs of the end plate 30.

[0102] See also Figure 4 In another embodiment of the present application, the end plate 30 has a length direction, and the end surface of the end plate 30 in the length direction is provided with an installation opening connecting the cavity 31 and the groove 32. The end surface of the end plate 30 in the length direction is also provided with a blocking piece, and the blocking piece is used to block the installation opening.

[0103] The blocking piece refers to a structure used to cover the installation opening to close the installation opening, including but not limited to structures such as tape and blocking cover plates.

[0104] With such a design, the sandwich layer composite structure 40a can be smoothly embedded in the cavity 31 of the end plate 30 from the installation port. After the installation is completed, the installation port is sealed with a sealing member to prevent the sandwich layer composite structure 40a from detaching from the installation port due to tilting or vibration of the equipment during operation.

[0105] See also Figures 5 to 7 In another embodiment of the present application, a foam layer 42 is provided on one surface of the vacuum plate 41 , and the vacuum plate 41 and the foam layer 42 constitute a single-layer composite structure 40 b , and the single-layer composite structure 40 b is provided on the inner wall or the outer wall of the battery box 10 .

[0106] The single-layer composite structure 40 b includes two stacked layer structures, wherein the foam layer 42 is stacked on one side surface of the vacuum plate 41 and covers the vacuum plate 41 .

[0107] When there is enough space inside the battery case 10, the single-layer composite structure 40b can be arranged on the inner wall of the battery case 10; and when there is not enough space inside the battery case 10 to install the single-layer composite structure 40b, the single-layer composite structure 40b can be arranged on the outer wall of the battery case 10. Of course, in some embodiments, the single-layer composite structure 40b can also be arranged on both the inner wall and the outer wall of the battery case 10.

[0108] In this design, by setting a single-layer composite structure 40b on the inner wall or outer wall of the battery case 10, when used in a low-temperature environment, the single-layer composite structure 40b can keep the battery cell 20 warm, thereby reducing the heating time of the battery cell 20. In addition, the design of the single-layer composite structure 40b can make the overall thickness of the thermal insulation structure 40 smaller. When the single-layer composite structure 40b is set on the inner wall of the battery case 10, the space occupied by the thermal insulation structure 40 on the inner side of the battery case 10 can be reduced, and more space can be used to install the battery cell 20, thereby improving the volume energy density; and when the single-layer composite structure 40b is set on the outer wall of the battery case 10, the overall volume of the battery device 100 can be reduced.

[0109] See also Figure 5 , Figure 6 In another embodiment of the present application, a mounting groove 421 is provided on one side surface of the foam layer 42, and the vacuum plate 41 is arranged in the mounting groove 421. A glue layer 43 is provided between the side of the vacuum plate 41 exposed at the notch of the mounting groove 421 and the inner wall or outer wall of the battery box 10.

[0110] During assembly, adhesive can be applied to the side of the vacuum plate 41 exposed to the notch of the mounting groove 421, and the single-layer composite structure 40b can be placed on the inner wall or outer wall of the battery case 10, and the adhesive layer 43 can be formed after the adhesive is cooled. The adhesive can be selected from pressure-sensitive double-sided adhesive, structural adhesive, and curing adhesive. Among them, the pressure-sensitive double-sided adhesive can be of substrate and substrate-free type, and the adhesive is acrylate; the structural adhesive can be polyurethane or epoxy resin; the curing adhesive can be acrylate or epoxy resin. Among them, due to the complex external environmental conditions, it may experience debonding due to gravel impact, water flow impact, condensed water accumulation, volatile solvents or salt spray corrosion, and the adhesive layer 43 can be selected as structural adhesive. Before pasting the single-layer composite structure 40b on the inner wall or outer wall of the battery case 10, it is necessary to clean the side of the vacuum plate 41 exposed to the notch of the mounting groove 421 to ensure that the surface energy and roughness meet the requirements, and no impurities are allowed on the surface.

[0111] Such a design may be subjected to stone impact, water flow impact and other phenomena due to the complex external environment conditions. Therefore, by installing the vacuum plate 41 in the installation groove 421 of the foam layer 42, the protective effect of the vacuum plate 41 can be improved. In addition, by using the adhesive layer 43 to fix the single-layer composite structure 40b on the inner wall or outer wall of the battery box 10, the installation reliability of the single-layer composite structure 40b can be improved.

[0112] In some embodiments, the thickness of the single-layer composite structure 40b pasted on the inner wall of the battery case 10 can be controlled between 2 mm and 4 mm, for example, 2 mm, 2.5 mm, 3 mm, 3.5 mm, 3.8 mm, 4 mm, etc. This can avoid the single-layer composite structure 40b occupying too much inner space of the battery case 10, allowing more space to install battery cells 20 to increase the volume energy density.

[0113] See also Figures 2 to 7 In one embodiment of the present application, a glue layer 43 is provided between the vacuum plate 41 and the foam layer 42 .

[0114] During assembly, adhesive can be applied on one side of the vacuum plate 41 or the foam layer 42, and the vacuum plate 41 and the foam layer 42 are stacked, and the adhesive layer 43 is formed after the adhesive is cooled. The adhesive can be selected from pressure-sensitive double-sided adhesive, structural adhesive, and curing adhesive. The pressure-sensitive double-sided adhesive can be of the type with or without a substrate, and the adhesive is of the type of acrylate; the structural adhesive can be of the type of polyurethane or epoxy resin; and the curing adhesive can be of the type of acrylate or epoxy resin. After the three types of adhesives are pasted or coated on the foam layer 42 or the vacuum plate 41, pressure needs to be applied to improve the bonding strength between the two adherends.

[0115] Such a design can improve the connection reliability between the foam layer 42 and the vacuum plate 41 by fixing the foam layer 42 on the vacuum plate 41 by gluing the adhesive layer 43 .

[0116] See also Figures 1 to 7 The present application also proposes a thermal insulation structure 40, which is configured to be installed on the battery box 10, and the thermal insulation structure 40 includes a vacuum plate 41, and the vacuum plate 41 includes a core material 411 and a protective layer 412, and the protective layer 412 forms a vacuum cavity, and the core material 411 is filled in the vacuum cavity.

[0117] According to some embodiments of the present application, the present application provides a battery device 100 including a heat preservation structure 40, see Figures 1 to 7 The battery device 100 further includes a battery box 10, a plurality of battery cells 20 disposed in the battery box 10, and two oppositely disposed end plates 30, wherein the plurality of battery cells 20 are disposed between the two end plates 30; wherein a heat preservation structure 40 is installed between the battery cells 20 and the end plates 30, inside the end plates 30, or at least one of the inner wall or outer wall of the battery box 10. The heat preservation structure 40 includes a vacuum plate 41 and a foam layer 42, wherein the foam layer 42 is disposed on the surface of the vacuum plate 41. The heat preservation structure 40 may be a sandwich composite structure 40a or a single-layer composite structure 40b.

[0118] In the technical solution of the embodiment of the present application, the technical solution of the present application is to install a heat preservation structure 40 between the battery cell 20 and the end plate 30, inside the end plate 30, or on at least one of the inner wall or outer wall of the battery box 10. The heat preservation structure 40 includes a vacuum plate 41 and a foam layer 42, and the heat preservation structure 40 can be a sandwich layer composite structure 40a or a single layer composite structure 40b. The sandwich layer composite structure 40a can be provided between the battery cell 20 and the end plate 30, or inside the end plate 30, which can reduce the heat exchange between the end battery cell 20 and the end plate 30 in a low temperature environment, so as to reduce the temperature difference between the end battery cell 20 and the adjacent battery cell 20, thereby improving the service life of the end battery cell 20, and providing a better buffering effect to the battery cell 20 in the working state, and at the same time, can better prevent the vacuum plate 41 from being punctured by metal foreign bodies introduced during the assembly process or remaining inside the battery device 100. The battery device 100 usually needs to be heated in a low temperature environment to maintain the performance and safety of the battery device 100. A single-layer composite structure 40b can be set on the inner wall or outer wall of the battery box 10. The single-layer composite structure 40b can keep the battery cells 20 inside the battery box 10 warm, thereby reducing the heating time of the battery cells 20.

[0119] The present application also proposes an electrical device, which includes a battery device 100. The specific structure of the battery device 100 refers to the above embodiment. Since the electrical device adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0120] The above description is only an exemplary embodiment of the present application and does not limit the patent scope of the present application. All equivalent structural changes made by using the contents of the present application specification and drawings under the technical concept of the present application, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A battery device, characterized in that: It includes a battery box, a plurality of battery cells arranged in the battery box, and a heat preservation structure installed on the battery box; Wherein, the heat-insulating structure comprises a vacuum panel, the vacuum panel comprises a core material and a protective layer, the protective layer forms a vacuum cavity, and the core material is filled in the vacuum cavity.

2. The battery device according to claim 1, characterized in that: The core material comprises a fiber member, a getter and a desiccant.

3. The battery device according to claim 1, characterized in that: The protective layer comprises: A sealing layer, wherein the sealing layer wraps the core material; A sealing layer, the sealing layer wraps the sealing layer; A toughening layer, wherein the toughening layer wraps the sealing layer; The puncture-proof layer wraps the toughening layer.

4. The battery device according to claim 3, characterized in that: The periphery of the protective layer includes a sealed edge, and the sealed edge is located outside the periphery of the core material.

5. The battery device according to any one of claims 1 to 4, characterized in that: The battery device further comprises at least two end plates arranged opposite to each other in the battery box, and a plurality of the battery cells are arranged between the two end plates; The heat preservation structure is installed between the battery cell and the end plate, inside the end plate, or on at least one of the inner wall or outer wall of the battery box.

6. The battery device according to claim 5, characterized in that The heat-insulating structure further comprises a foam layer, and the foam layer is arranged on the surface of the vacuum plate.

7. The battery device according to claim 6, characterized in that: The vacuum panel has two plate surfaces arranged opposite to each other, both of which are provided with the foam layer, and the vacuum panel and the two foam layers form a sandwich layer composite structure, which is arranged between the battery cell and the end plate, or the sandwich layer composite structure is embedded in the end plate.

8. The battery device according to claim 7, characterized in that: When the sandwich layer composite structure is arranged between the battery cell and the end plate, the periphery of the foam layer protrudes from the periphery of the vacuum plate.

9. The battery device according to claim 8, characterized in that: A glue layer is provided between the battery cell and one side of the foam layer away from the vacuum plate, and a glue layer is provided between the end plate and another side of the foam layer away from the vacuum plate.

10. The battery device according to claim 7, characterized in that: When the sandwich layer composite structure is embedded in the end plate, the periphery of the vacuum plate protrudes beyond the periphery of the foam layer.

11. The battery device according to claim 10, characterized in that: A cavity is formed in the end plate, the sandwich composite structure is arranged in the cavity, a groove is provided on the side wall of the cavity, and the edge sealing of the periphery of the vacuum panel at least partially extends into the groove.

12. The battery device according to claim 11, characterized in that The edge sealing is clearance-matched with the groove.

13. The battery device according to claim 12, characterized in that: The end plate has a length direction, and the end surface of the end plate in the length direction is provided with an installation opening connecting the cavity and the groove. The end surface of the end plate in the length direction is also provided with a blocking piece, and the blocking piece is used to block the installation opening.

14. The battery device according to claim 6, characterized in that: The foam layer is disposed on one surface of the vacuum plate, and the vacuum plate and the foam layer form a single-layer composite structure, and the single-layer composite structure is disposed on the inner wall or the outer wall of the battery box.

15. The battery device according to claim 14, characterized in that: A mounting groove is provided on one side surface of the foam layer, the vacuum plate is arranged in the mounting groove, and a glue layer is provided between the side of the vacuum plate exposed at the notch of the mounting groove and the outer wall of the battery box.

16. The battery device according to claim 6, characterized in that: A glue layer is provided between the vacuum plate and the foam layer.

17. A thermal insulation structure, characterized in that: The heat-insulating structure is configured to be installed on a battery box, and the heat-insulating structure includes a vacuum plate, and the vacuum plate includes a core material and a protective layer. The protective layer forms a vacuum cavity, and the core material is filled in the vacuum cavity.

18. An electrical equipment, characterized in that: A battery device comprising the battery device as claimed in any one of claims 1 to 16.

Images