Battery device, heat preservation structure and electric appliance

Abstract

The application relates to a battery device, a heat preservation structure and an electric equipment. The battery device comprises a battery pack and a heat preservation structure. The heat preservation structure is attached to at least one side surface of the battery pack. The heat preservation structure comprises a bubble bag and a composite cover film. The bubble bag is arranged on at least one side surface of the battery pack. The composite cover film comprises a connecting layer and a metal-plated film which are sequentially arranged in a direction away from the battery pack. The connecting layer is connected with the bubble bag. The application can improve the heat preservation reliability of the battery device.

Description

Technical Field

[0001] This application relates to the field of battery thermal management technology, and in particular to battery devices, insulation structures and electrical equipment. Background Technology

[0002] Battery devices are widely used in electronic devices such as mobile phones, laptops, electric vehicles, electric cars, electric airplanes, electric ships, electric toy cars, electric toy ships, electric toy airplanes, and power tools, etc.

[0003] As the core energy storage unit for electric vehicles and various electrical devices, the performance of the battery pack is closely related to ambient temperature. In low-temperature environments, the viscosity of the electrolyte inside the battery increases and the ionic conductivity decreases, leading to a reduction in battery discharge capacity and charge / discharge efficiency. In severe cases, this can even affect the battery's cycle life and safety. Therefore, effective insulation of the battery pack is a crucial means to ensure the battery operates normally in low-temperature environments.

[0004] The thermal insulation reliability of the battery device needs to be improved. Utility Model Content

[0005] In view of the above problems, this application provides a battery device, a thermal insulation structure, and an electrical device, aiming to improve the thermal insulation reliability of the battery device.

[0006] In a first aspect, this application proposes a battery device, which includes a battery pack and a thermal insulation structure. The thermal insulation structure is attached to at least one surface of the battery pack. The thermal insulation structure includes a bubble bag and a composite cover film. The bubble bag is disposed on at least one surface of the battery pack. The composite cover film includes a connecting layer and a metal-plated film that are sequentially stacked in a direction away from the battery pack. The connecting layer is connected to the bubble bag.

[0007] In the embodiments of this application, the bubble bag serves as the inner insulation material. Its sealed air layer can effectively block heat convection and reduce heat conduction. The metal-plated film layer in the composite cover film can suppress heat radiation. By setting an insulation structure including bubble bags and composite cover film on the surface of the battery pack, the heat exchange between the battery pack and the external environment can be effectively reduced, and the insulation reliability of the battery device can be effectively improved.

[0008] In some embodiments, the bubble bag includes a leveling layer and a plurality of cavitation structures protruding from the leveling layer toward the composite cover film.

[0009] This design allows the flat layer to form good surface contact with the battery pack surface, which is beneficial for the stable adhesion of the insulation structure. At the same time, the cavitation structure faces the composite cover film, so that the composite cover film contacts the top of the cavitation bubble of the bubble bag, forming a sealed air insulation layer between the flat layer of the composite cover film and the bubble bag, which is beneficial for further improving the insulation effect.

[0010] In some embodiments, multiple cavitation structures are spaced apart along the plane of the flattening layer, and the distance between two adjacent cavitation structures is less than or equal to 70 mm; and / or, the projected shape of the cavitation structure along the thickness direction of the insulation structure is circular or polygonal, and the diameter of the projected shape or the diameter of the circumscribed circle is less than or equal to 10 mm.

[0011] In these embodiments, by limiting the spacing and size of the cavitation structures, the uniformity of the air insulation layer distribution and the structural strength of the bubble bag can be optimized, ensuring good thermal insulation effect while ensuring that the insulation structure has sufficient compressive strength and structural stability.

[0012] In some embodiments, the smoothing layer is bonded to the battery pack via adhesive.

[0013] In these embodiments, the thermal insulation structure is attached to the outer surface of the battery pack using an adhesive backing method. This method has the advantages of easy assembly, firm adhesion, and no additional mechanical fasteners, which is beneficial for the lightweight design of the battery pack.

[0014] In some embodiments, the composite cover film further includes a matte film disposed on the side of the metallized film opposite to the bubble bag.

[0015] In these embodiments, the outermost layer of the composite cover film is provided with a matte film, which can effectively eliminate the reflective phenomenon of the metal-plated film layer; at the same time, as the outermost protective layer, the matte film can also provide physical protection for the inner metal-plated film, preventing the metal-plated film from being scratched or worn by external hard objects.

[0016] In some embodiments, the thickness of the matte film is greater than or equal to 5 micrometers and less than or equal to 23 micrometers; and / or, the matte film includes at least one of BOPP matte film, PP matte film, PC matte film and PET matte film.

[0017] In these embodiments, the matte film within this thickness range has sufficient mechanical strength and durability, while avoiding an increase in the overall thickness and weight of the insulation structure due to excessive thickness; the matte film with a variety of optional materials can improve the design adaptability and economy of the outer protective layer of the insulation structure.

[0018] In some embodiments, the metallized film includes at least one of aluminized polyester film, tin-plated film, and nickel-plated film; and / or, the bubble bag includes at least one of PP bubble bag, PE bubble bag, PC bubble bag, and PET bubble bag.

[0019] In these embodiments, the metallized film serves as the intermediate layer of the composite cover film. On the one hand, it utilizes the low infrared emissivity of the metal layer to suppress thermal radiation and reduce heat loss from the battery pack. On the other hand, the metal layer acts as a sacrificial layer to provide moisture-proof and corrosion-proof functions, thereby improving the service life and reliability of the insulation structure in complex environments. PP, PE, PC, and PET can all be used as molding materials for bubble bags, which can block heat convection and reduce heat conduction.

[0020] In some embodiments, the connecting layer includes a heat-sealing connecting layer, through which the composite cover film is connected to the bubble bag.

[0021] In these embodiments, the heat-sealing composite method eliminates the need for additional adhesive coating, which simplifies the preparation process, reduces manufacturing costs, and avoids the risk of interlayer separation caused by adhesive aging and failure due to long-term use.

[0022] In some embodiments, the heat-sealing bonding layer includes a chlorinated polyethylene layer.

[0023] In these embodiments, the CPE layer serves as a heat-sealing bonding layer, utilizing its excellent heat-sealing properties to achieve a strong bond between the composite cover film and the bubble bag, eliminating the need for additional adhesives, simplifying the preparation process, and avoiding interlayer separation problems caused by adhesive aging and failure.

[0024] In some embodiments, the thickness of the metallized film is greater than or equal to 5 micrometers and less than or equal to 20 micrometers; and / or, the thickness of the bonding layer is greater than or equal to 15 micrometers and less than or equal to 30 micrometers.

[0025] In these embodiments, the thickness range of the metallized film ensures that it has sufficient moisture-proof, corrosion-proof, and heat radiation-suppressing effects, while controlling material costs and overall thickness. The thickness range of the bonding layer ensures sufficient heat-sealing strength, guaranteeing a firm and reliable connection between the composite cover film and the bubble bag, while avoiding excessive thickness that could affect the flexibility and fit of the overall insulation structure.

[0026] In some embodiments, the insulation structure includes at least two layers of bubble bags, which are stacked sequentially between the composite cover film and the battery pack; wherein the thickness of a single bubble bag is less than or equal to 3 mm; and / or the total thickness of the at least two bubble bags is greater than or equal to 2 mm and less than or equal to 10 mm.

[0027] In these embodiments, by setting one or more bubble bags, the total thickness of the bubble bags can be flexibly adjusted according to the insulation requirements of different battery packs. The multi-layer air insulation layer formed by stacking multiple bubble bags can further improve the effect of blocking heat convection and reducing heat conduction.

[0028] Secondly, this application provides a thermal insulation structure, including a bubble bag and a composite cover film; the composite cover film is disposed on one side of the bubble bag, and the composite cover film includes a connecting layer and a metallized film sequentially stacked in a direction away from the bubble bag, the connecting layer being connected to the bubble bag. This thermal insulation structure can be any of the thermal insulation structures described in the first aspect above.

[0029] Thirdly, this application provides an electrical device including a battery device according to any of the first aspects of the above, the battery device being used to provide electrical energy; or including the heat insulation structure according to the second aspect of the above.

[0030] The above description is merely an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, specific embodiments of this application are given below. Attached Figure Description

[0031] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0032] Figure 1 This is a schematic diagram of the structure of a vehicle provided in one embodiment of this application; Figure 2 This is a schematic diagram of the structure of the battery pack in a battery device provided in an embodiment of this application; Figure 3 This is a schematic diagram of the structure of a battery module provided in one embodiment of this application; Figure 4 This is a schematic diagram of the exploded structure of a single battery cell provided in an embodiment of this application; Figure 5 This is a three-dimensional structural diagram of the heat insulation structure in a battery device provided in an embodiment of this application; Figure 6 This is one of the cross-sectional structural schematic diagrams of the thermal insulation structure provided in one embodiment of this application; Figure 7 This is a cross-sectional structural diagram of the bubble bag in an embodiment of the thermal insulation structure provided in this application; Figure 8 This is a second schematic cross-sectional view of the thermal insulation structure provided in one embodiment of this application; Figure 9 This is a cross-sectional exploded view of an embodiment of the thermal insulation structure provided in this application; Figure 10 This is the third cross-sectional schematic diagram of the thermal insulation structure provided in one embodiment of this application.

[0033] The accompanying drawings may not be drawn to scale.

[0034] Explanation of reference numerals in the attached figures: 1000, vehicles; 100. Battery assembly; 110. Controller; 120. Motor; 200. Battery module; 300. Enclosure; 301. First enclosure; 302. Second enclosure; 10. Battery cell; 11. Housing; 12. Electrode assembly; 13. End cap assembly; 4. Thermal insulation structure; 41. Bubble bag; 411. Smoothing layer; 412. Cavitation structure; 42. Composite cover film; 421. Connecting layer; 422. Metallized film; 423. Matte film; Z, thickness direction. Detailed Implementation

[0035] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0036] Unless otherwise defined, all technical and scientific terms used in this application have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains; the terminology used in the description of this application is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms "comprising" and "having," and any variations thereof, in the description, claims, and accompanying drawings of this application are intended to cover non-exclusive inclusion. The terms "first," "second," etc., in the description, claims, or accompanying drawings of this application are used to distinguish different objects, not to describe a specific order or hierarchy.

[0037] In this application, the reference to "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment that is mutually exclusive with other embodiments.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "attachment" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0039] In this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A existing alone, A and B existing simultaneously, and B existing alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0040] In the embodiments of this application, the same reference numerals denote the same components, and for the sake of brevity, detailed descriptions of the same components are omitted in different embodiments. It should be understood that the thickness, length, width, and other dimensions of various components in the embodiments of this application shown in the accompanying drawings, as well as the overall thickness, length, width, and other dimensions of the integrated device, are merely illustrative and should not constitute any limitation on this application.

[0041] In this application, "multiple" means two or more (including two).

[0042] As the core energy storage unit for electric vehicles and various electrical devices, the performance of the battery pack is closely related to ambient temperature. In low-temperature environments, the viscosity of the electrolyte inside the battery cells increases and the ionic conductivity decreases, leading to a reduction in the discharge capacity and charge / discharge efficiency of the battery cells. In severe cases, this can even affect the cycle life and safety of the battery cells. Therefore, effective insulation of the battery pack is a crucial means to ensure the normal operation of the battery cells in low-temperature environments.

[0043] The thermal insulation reliability of the battery device needs to be improved.

[0044] In related technologies, battery pack insulation solutions mainly suffer from the following problems: First, most insulation materials are single-material foam or cotton materials, which have a simple heat insulation principle, limited overall heat insulation effect, and poor heat insulation performance.

[0045] Secondly, most insulation solutions use foamed materials attached to the outer surface of the battery pack. Foamed materials are loose and bulky, occupying a lot of installation space. Moreover, due to the molding process of the material itself and the complex morphology of the outer surface of the battery pack, it is difficult to achieve full coverage of the entire outer surface of the battery pack, resulting in insulation blind spots.

[0046] Third, using foam materials for insulation is problematic. Foam materials have a porous structure and are easily contaminated by external pollutants such as oil and dirt, or become damp after being soaked in rainwater. Once these situations occur, the insulation performance of the foam will decrease significantly, or even lose its insulation function.

[0047] Fourth, the battery pack is usually located at the bottom of the vehicle, and its outer surface is exposed to a complex and harsh working environment. It is exposed to adverse conditions such as impact from flying stones, splashing mud and water, and chemical corrosion for a long time. Ordinary insulation materials are easily corroded, worn or damaged, resulting in a short service life and frequent replacement.

[0048] To improve at least one of the above problems, embodiments of this application provide a battery device, which includes a battery pack and a thermal insulation structure. The thermal insulation structure includes a bubble bag and a composite cover film. The bubble bag serves as an inner thermal insulation material, and its sealed air layer can effectively block heat convection and reduce heat conduction. The metal-plated film layer in the composite cover film can suppress heat radiation. By setting a thermal insulation structure including a bubble bag and a composite cover film on the surface of the battery pack, the heat exchange between the battery pack and the external environment can be effectively reduced, and the thermal insulation reliability of the battery device can be effectively improved.

[0049] The technical solutions described in the embodiments of this application are applicable to battery devices and electrical equipment using battery devices.

[0050] Electrical equipment can include vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc. Vehicles can be gasoline-powered cars, natural gas-powered cars, or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. Spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Electric toys include stationary or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, etc. Power tools include metal cutting power tools, grinding power tools, assembly power tools, and railway power tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, etc. This application does not impose any special limitations on the above-mentioned electrical equipment.

[0051] The battery device mentioned in the embodiments of this application refers to a single physical module comprising one or more battery cells to provide higher voltage and capacity. For example, the battery device mentioned in this application may include a battery module or battery pack. A battery device generally includes a housing for encapsulating one or more battery cells. The housing can prevent liquids or other foreign matter from affecting the charging or discharging of the battery cells.

[0052] In some embodiments, the battery device can be used in an energy storage device. The energy storage device may include an energy storage container, an energy storage cabinet, etc., and the battery device is used to store or provide electrical energy.

[0053] It should be understood that the technical solutions described in the embodiments of this application are not limited to the battery devices and electrical equipment described above, but can also be applied to all battery devices including housings and electrical equipment using battery devices. However, for the sake of brevity, the following embodiments are all illustrated using electric vehicles as examples.

[0054] Please refer to Figure 1 , Figure 1 This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 1000 can be a gasoline-powered vehicle, a natural gas-powered vehicle, or a new energy vehicle. New energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc. A battery device 100 is provided inside the vehicle 1000, and the battery device 100 can be located at the bottom, front, or rear of the vehicle 1000. The battery device 100 can be used to power the vehicle 1000; for example, the battery device 100 can serve as the operating power source for the vehicle 1000. The vehicle 1000 may also include a controller 110 and a motor 120. The controller 110 is used to control the battery to supply power to the motor 120, for example, to meet the power needs of the vehicle 1000 during starting, navigation, and driving.

[0055] In some embodiments of this application, the battery device 100 can not only serve as the operating power source for the vehicle 1000, but also as the driving power source for the vehicle 1000, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 1000.

[0056] Figure 2 A schematic diagram of the structure of the battery pack in a battery device according to an embodiment of this application is shown.

[0057] The battery device 100 mentioned in the embodiments of this application may include one or more battery cell assemblies for providing voltage and capacity. A battery cell assembly may include multiple battery cells 10, which are connected in series, parallel, or mixed connections via a busbar.

[0058] In some embodiments, the battery cell assembly is typically formed by arranging a plurality of battery cells 10.

[0059] As an example, the battery cell assembly can be a battery module 200, which is formed by arranging and fixing multiple battery cells 10 into a single module. As an example, the battery module 200 can be formed by bundling multiple battery cells 10 together with cable ties.

[0060] In some embodiments, the battery device 100 may include a battery pack, which includes a housing 300 and one or more battery cell assemblies housed in the housing 300.

[0061] As an example, the battery cell assembly can be a battery module 200, which can be housed in the housing 300 by fixing the battery module 200 in the housing 300.

[0062] As an example, the battery cell assembly can also be housed in the housing 300 by directly fixing multiple battery cells 10 to the housing 300.

[0063] As an example, the housing 300 may include a first housing 301 and a second housing 302. The first housing 301 and the second housing 302 are fastened together to form a closed space inside the housing 300 to house the battery cell assembly. Here, "closed" refers to covering or closing, and can be either sealed or unsealed. The first housing 301 may be a top cover or a bottom plate.

[0064] As an example, if the first housing 301 is located below the second housing 302, it can also be referred to as the lower housing, and the second housing 302 is referred to as the upper housing. The lower housing may include a bottom support plate, and the upper housing may include a top cover. The housing 300 also includes a frame connecting the bottom support plate and the top cover.

[0065] In some embodiments, the housing 300 may be part of the chassis structure of the vehicle 1000. For example, a portion of the housing 300 may be at least a portion of the floor of the vehicle 1000, or a portion of the housing 300 may be at least a portion of the crossbeams and longitudinal beams of the vehicle 1000.

[0066] Figure 3 A schematic diagram of the structure of a battery module according to an embodiment of this application is shown.

[0067] In some embodiments, such as Figure 2 and Figure 3 As shown, there are multiple battery cells 10. These multiple battery cells 10 are first connected in series, parallel, or in a mixed manner to form a battery module 200. The multiple battery modules 200 are then connected in series, parallel, or in a mixed manner to form a whole, which is housed in the casing 300.

[0068] Multiple battery cells 10 in the battery module 200 can be electrically connected through a busbar component to achieve parallel, series, or mixed connection of multiple battery cells 10 in the battery module 200.

[0069] In this application, the battery cell 10 may include lithium-ion battery cells, sodium-ion battery cells, or magnesium-ion battery cells, etc., and the embodiments of this application are not limited to this.

[0070] Figure 4 An exploded structural diagram of a battery cell according to an embodiment of this application is shown.

[0071] A battery cell 10 refers to the smallest unit that makes up a battery. A battery cell 10 includes a housing 11, an electrode assembly 12, and an end cap assembly 13.

[0072] Electrode assembly 12 is the component in the battery cell 10 where electrochemical reactions occur. The housing 11 may contain one or more electrode assemblies 12. The electrode assembly 12 is mainly formed by winding or stacking electrode sheets, which are divided into positive and negative electrode sheets, and a separator is usually provided between the positive and negative electrode sheets. The portions of the positive and negative electrode sheets containing active material constitute the electrode body, while the portions of the positive and negative electrode sheets without active material each constitute a tab. The positive and negative tabs can be located together at one end of the electrode body or separately at both ends of the electrode body. During the charging and discharging process of the battery cell 10, the positive and negative active materials react with the electrolyte, and the tabs connect to the electrode terminals to form a current loop.

[0073] As an example, the battery cell 10 can be a cylindrical battery cell, a prismatic battery cell, a pouch battery cell, or a battery cell of other shapes. Prismatic battery cells include prismatic battery cells, blade-shaped battery cells, and multi-prismatic batteries, such as hexagonal prismatic batteries. This application does not have any particular limitations.

[0074] The housing 11 and the end cap assembly 13 can be independent components. One or more openings can be provided on the housing 11, and one or more end cap assemblies 13 can close the openings to form the internal environment of the battery cell 10. Optionally, the end cap assembly 13 and the housing 11 can be integrated. Optionally, the end cap assembly 13 and the housing 11 can form a common connection surface before other components are inserted into the housing, and the end cap assembly 13 closes the housing 11 when it is necessary to encapsulate the interior of the housing 11.

[0075] In some embodiments, the end cap assembly 13 is provided with at least one electrode terminal, which is electrically connected to the electrode tab. The electrode terminal can be directly connected to the electrode tab or indirectly connected to the electrode tab through a current collector. In addition, the electrode terminal can be provided not only on the end cap assembly 13, but also on the housing 11.

[0076] In some embodiments, the battery cell 10 also includes an electrolyte, which acts as a conductor of ions between the positive and negative electrodes.

[0077] Combined with reference Figures 2 to 8In a first aspect, this application proposes a battery device 100, which includes a battery pack and a heat insulation structure 4. The heat insulation structure 4 is attached to at least one side surface of the battery pack. The heat insulation structure 4 includes a bubble bag 41 and a composite cover film 42. The bubble bag 41 is disposed on at least one side surface of the battery pack. The composite cover film 42 includes a connecting layer 421 and a metal-plated film 422 that are sequentially stacked in a direction away from the battery pack. The connecting layer 421 is connected to the bubble bag 41.

[0078] Optionally, the battery pack includes a housing 300 and a plurality of battery cells 10. The housing 300 forms a receiving space, and the plurality of battery cells 10 are disposed in the receiving space. The thermal insulation structure 4 is attached to at least one side of the outer surface of the housing 300, and the outer surface of the housing 300 can be the surface facing away from the receiving space.

[0079] Optionally, bubble wrap 41 can be attached to the battery pack housing 300. For example, it can be attached to the top surface of the housing 300, or to the side surface of the housing 300.

[0080] Bubble bag 41 can be a cushioning material that forms a bubble structure by wrapping air in a thin film. It can be made by heat sealing plastic film and has a dot-shaped or strip-shaped hollow bag structure with a static air layer inside. It is lightweight and elastic.

[0081] In this embodiment, in addition to its inherent cushioning and protection function, the bubble bag 41 also utilizes the low thermal conductivity of its internal sealed air layer to provide insulation by blocking heat convection and reducing heat conduction.

[0082] The composite cover film 42 serves as the outer functional layer of the insulation structure 4, and works in conjunction with the bubble bag 41 to form a multi-layer composite insulation system.

[0083] For example, the connecting layer 421 may include an adhesive layer. As an example, an adhesive layer may be provided between the composite cover film 42 and the bubble bag 41, using the adhesive force to secure the two together. The adhesive may be a polyurethane adhesive, an acrylic pressure-sensitive adhesive, an epoxy resin adhesive, etc.

[0084] For example, the bonding layer 421 may include a hot melt adhesive layer, etc. As an example, a hot melt adhesive film may be provided between the composite cover film 42 and the bubble bag 41, and the hot melt adhesive film is melted by heating and pressurizing to bond the two materials together. The hot melt adhesive film may be POE hot melt adhesive film, EVA hot melt adhesive film, PA (polyamide) hot melt adhesive film, etc.

[0085] For example, the connecting layer 421 can be a polymer material layer that is fused and bonded to the surface of the bubble bag 41 by hot pressing, so as to achieve a tight and stable bond between the two. The heat sealing performance is used to achieve a strong composite between the composite cover film 42 and the bubble bag 41 without the need for additional adhesives, thus avoiding the problem of interlayer separation caused by adhesive aging and failure.

[0086] For example, the metallized film 422 can be a composite film layer on which a metal reflective layer is vacuum-deposited on the surface of a polymer substrate, used to block infrared heat radiation and serve as an external protective surface layer. The metallized film 422 can be adhesively bonded to the connecting layer 421.

[0087] In this embodiment, the metal-plated film 422 can be used as a "sacrificial layer" to play a role in moisture-proofing and corrosion prevention. When external water vapor or corrosive substances come into contact with it, they will preferentially react with the metal layer to protect the internal structure from corrosion and improve the service life and reliability of the insulation structure 4 in complex environments.

[0088] In the embodiment of this application, the battery device 100 includes a battery pack and a thermal insulation structure 4. The thermal insulation structure 4 includes a bubble bag 41 and a composite cover film 42. The bubble bag 41 serves as an inner thermal insulation material, and its sealed air layer can effectively block heat convection and reduce heat conduction. The metal-plated film 422 layer in the composite cover film 42 can suppress heat radiation. By setting the thermal insulation structure 4, which includes the bubble bag 41 and the composite cover film 42, on the surface of the battery pack, the heat exchange between the battery pack and the external environment can be effectively reduced, which can effectively improve the thermal insulation reliability of the battery device 100. This is beneficial for maintaining the operating temperature of the battery pack in low-temperature environments and improving the low-temperature charge and discharge performance and cycle life of the battery.

[0089] Compared with related technologies, the embodiments of this application effectively suppress the three heat transfer methods of heat conduction, heat convection and heat radiation at the same time, thereby improving the heat preservation performance of the battery device 100.

[0090] By combining the air insulation of the bubble bag 41 with the heat radiation reflection of the metal-plated film 422, a multi-layer physical insulation mechanism of air insulation and radiation blocking is formed, overcoming the shortcomings of the single insulation principle of a single foam material and improving the heat preservation performance. Secondly, both the bubble bag 41 and the composite cover film 42 are flexible thin-layer structures with controllable thickness and strong flexibility, which can closely fit the complex morphology of the outer surface of the battery pack, which is conducive to achieving full coverage without blind spots, while significantly reducing the installation space occupied. Thirdly, the composite cover film 42 on the outside is a dense continuous film layer, which can effectively block the intrusion of external oil, dirt and rainwater, and prevent the inner bubble bag 41 from losing its heat preservation function due to moisture or pollution, thus ensuring the long-term stability of the heat preservation performance. Fourthly, the outer metal-plated film 422 layer has excellent wear resistance, resistance to flying stone impact and chemical corrosion resistance, which can easily adapt to harsh working conditions such as flying stone impact, mud and water splash and chemical corrosion at the bottom of the vehicle 1000, extending the service life of the heat preservation structure 4.

[0091] Reference Figure 7 In some embodiments, the bubble bag 41 includes a leveling layer 411 and a plurality of cavitation structures 412 protruding from the leveling layer 411 toward the composite cover film 42. The leveling layer 411 side of the bubble bag 41 faces the battery pack surface, and the cavitation structures 412 side faces the composite cover film 42.

[0092] The flat layer 411 serves as the base film layer of the bubble bag 41. The cavitation structure 412 can be a raised vesicle formed by thermoforming the film. These protrusions contain a static air layer, thereby forming several discrete or spaced local air insulation units on the outside of the battery pack. The specific shape, arrangement, and size parameters of the cavitation structure 412 can be flexibly adjusted according to actual insulation requirements and installation space. For example, in terms of shape, it can be set as a hemispherical, cylindrical, ellipsoidal, or strip-shaped regular geometric shape; for example, in terms of arrangement, it can be arranged in a honeycomb pattern, a matrix array, or a strip-shaped parallel arrangement that extends continuously in a specific direction to improve the air insulation coverage per unit area; in terms of size design, the height, diameter, wall thickness, and adjacent spacing of each cavitation structure 412 can be differentiated according to the curvature changes and insulation gradient requirements of different areas of the battery pack surface.

[0093] The flat layer 411 provides a continuous and dense bottom sealing base for the bubble bag 41, ensuring a tight and stable fit between it and the connecting layer 421 of the battery pack outer surface and the composite cover film 42. On the other hand, the cavitation structure 412 protruding from the flat layer 411 toward the composite cover film 42 places the static air insulation layer on the heat transfer path of the battery pack to dissipate heat. Compared with a single flat film layer or fluffy foam material, it greatly increases the volume of the insulation air and the length of the thermal resistance path, effectively suppressing heat convection and heat conduction, and improving the heat preservation efficiency.

[0094] This arrangement allows the flat layer 411 to form good surface contact with the battery pack surface, which is beneficial for the stable attachment of the insulation structure 4. At the same time, the cavitation structure 412 faces the composite cover film 42, so that the composite cover film 42 contacts the top of the cavitation bubble of the bubble bag 41, forming a sealed air insulation layer between the composite cover film 42 and the flat layer 411 of the bubble bag 41, which is beneficial for further improving the insulation effect.

[0095] In some embodiments, a plurality of cavitation structures 412 are spaced apart along the plane of the flattening layer 411, and the spacing between two adjacent cavitation structures 412 is less than or equal to 70 mm.

[0096] The spacing between two adjacent cavitation structures 412 refers to the shortest straight-line distance along the plane of the flattening layer 411 between the outer contour edges of the two adjacent cavitation structures 412. For example, this spacing can be 10mm, 30mm, 50mm, 60mm, or 70mm. The spacing between two cavitation structures 412 can be measured non-contactly using an optical image measuring instrument.

[0097] By spacing the cavitation structures 412, it is possible to ensure that the bubble bag 41 has a sufficient air insulation layer while also ensuring the overall structural strength and stability of the bubble bag 41. The spacing between adjacent cavitation structures 412 is controlled within 70mm to avoid uneven insulation performance caused by excessive spacing.

[0098] Optionally, the projected shape of the cavitation structure 412 along the thickness direction Z of the insulation structure 4 is circular or polygonal, and the diameter of the projected shape or the diameter of the circumscribed circle is less than or equal to 10 mm. For example, the diameter can be 10 mm, 8 mm, 7 mm, 5 mm, or 3 mm. This diameter can be measured non-contactly using an optical image measuring instrument or a high-magnification reading microscope to avoid measurement errors caused by compression deformation of the soft cavitation wall by contact measuring instruments.

[0099] The air bubble structure 412 can be designed in various shapes such as round, elliptical, square, rectangular, and hexagonal, with its projected size controlled within 10mm. This is beneficial for forming more air insulation units per unit area, thereby improving the uniformity and overall effect of heat preservation.

[0100] In these embodiments, by limiting the spacing and size of the cavitation structures 412, the uniformity of the air insulation layer distribution and the structural strength of the bubble bag 41 can be optimized, ensuring good insulation effect while ensuring that the insulation structure 4 has sufficient compressive strength and structural stability.

[0101] In some embodiments, the flattening layer 411 is bonded to the battery pack by an adhesive backing.

[0102] The adhesive backing can be a pressure-sensitive adhesive layer pre-applied to one side of the bonding surface of the insulation structure 4, which can be used immediately after application. It has a certain initial tack at room temperature and can quickly form a strong physical bond with the outer surface of the battery pack after applying appropriate pressure. The adhesive backing is applied to the outer surface of the flat layer 411 of the bubble bag 41, that is, the side facing the battery pack, and the insulation structure 4 is bonded and fixed to the outer surface of the battery pack as a whole by the adhesive backing.

[0103] Optionally, the adhesive backing also has moisture-proof and corrosion-proof properties. For example, the adhesive backing can be an acrylic pressure-sensitive adhesive or an organosilicon pressure-sensitive adhesive with water resistance and chemical corrosion resistance to ensure that the adhesive layer will not fail due to moisture or chemical corrosion in the complex operating environment at the bottom of the battery pack, and to ensure that the thermal insulation structure 4 is reliably attached to the surface of the battery pack for a long time.

[0104] Optionally, the adhesive can be applied in a full-area manner to achieve maximum bonding strength, or in a dotted, striped, or grid-like discontinuous application to save adhesive while ensuring sufficient bonding strength and facilitating air release, thus avoiding air bubbles during bonding that could cause localized detachment.

[0105] In these embodiments, the thermal insulation structure 4 is attached to the outer surface of the battery pack using an adhesive backing method. This method has the advantages of easy assembly, firm adhesion, and no additional mechanical fasteners, which is beneficial to the lightweight design of the battery pack.

[0106] Meanwhile, the adhesive backing also has moisture-proof and corrosion-proof properties, which can adapt to the complex working environment at the bottom of the battery pack, ensuring that the insulation structure 4 is stably attached to the surface of the battery pack for a long time and extending the service life of the insulation structure 4.

[0107] Reference Figure 8 and Figure 9 In some embodiments, the composite cover film 42 further includes a matte film 423, which is disposed on the side of the metallized film 422 opposite to the bubble bag 41.

[0108] The composite cover film 42 comprises three layers from the outside to the inside (i.e., along the direction closest to the battery pack): a matte film 423, a metallized film 422, and a connecting layer 421. The matte film 423 is the outermost layer, the metallized film 422 is the middle layer, and the connecting layer 421 is the inner layer. The connecting layer 421 is located on the side connected to the bubble bag 41.

[0109] The matte film 423 is a polymer film layer with a microscopically rough surface and a gloss level significantly lower than that of conventional smooth films. It can be made from polyester (PET) or biaxially oriented polypropylene (BOPP) substrates through a matte treatment to cause diffuse reflection of incident light rather than specular reflection, thus presenting a low-gloss matte visual effect. The matte film 423 is disposed on the outer side of the metallized film 422 to eliminate the metallic luster reflection on the surface of the metallized film 422.

[0110] For example, when the battery device 100 is applied in the vehicle 1000, the design of the matte film 423 can reduce the risk of glare caused by sunlight shining on the metal film 422 during driving, thereby improving driving safety.

[0111] Furthermore, the surface of the matte film 423 can be further treated with an anti-scratch coating or a self-cleaning hydrophobic coating to enhance its scratch resistance and stain resistance.

[0112] In these embodiments, the outermost layer of the composite cover film 42 is provided with a matte film 423, which can effectively eliminate the reflective phenomenon of the metal-plated film 422 layer; at the same time, the matte film 423, as the outermost protective layer, can also provide physical protection for the inner metal-plated film 422, preventing the metal-plated film 422 from being scratched or worn by external hard objects.

[0113] In some embodiments, the thickness of the matte film 423 is greater than or equal to 5 micrometers and less than or equal to 23 micrometers. Exemplarily, the thickness of the matte film 423 can be 5 micrometers, 8 micrometers, 12 micrometers, 18 micrometers, or 23 micrometers. The thickness of the matte film 423 can be measured using a mechanical pointer-type or digital thickness gauge conforming to GB / T 6672 standard, taking the arithmetic mean after uniformly selecting no fewer than 5 measurement points on the film surface.

[0114] Optionally, the matte film 423 includes at least one of BOPP matte film 423, PP matte film 423, PC matte film 423, and PET matte film 423. For example, the matte film 423 may include only BOPP matte film 423.

[0115] BOPP (biaxially oriented polypropylene) matte film 423 is a matte film made from polypropylene through a biaxial stretching process. It features high tensile strength, high impact strength, good rigidity, and high toughness. PP (polypropylene) matte film 423, PC (polycarbonate) matte film 423, and PET (polyethylene terephthalate) matte film 423 are all plastic films with matte effect, and can be selected according to specific cost, performance, and processing requirements.

[0116] In addition to the single-material film types listed above, the matte film 423 can also be a blended modified film or a co-extruded composite film of two or more materials. For example, a layer of PP matte film 423 can be added between the PET matte film 423 and the metallized film 422 to improve the interlayer peel strength, or a matte film 423 co-extruded with BOPP and PET can be used to balance the high transparency of BOPP and the high heat resistance of PET.

[0117] In these embodiments, the matte film 423 within this thickness range has sufficient mechanical strength and durability, while avoiding an increase in the overall thickness and weight of the insulation structure 4 due to excessive thickness; the matte film 423 with a variety of optional materials can improve the design adaptability and economy of the outer protective layer of the insulation structure 4.

[0118] In some embodiments, the metallized film 422 includes at least one of a polyester aluminum-plated film, a tin-plated film, and a nickel-plated film. Exemplarily, the metallized film 422 may consist only of a polyester aluminum-plated film.

[0119] VMPET (Metallized Polyester Film) is a composite material formed by depositing a layer of aluminum onto the surface of polyester film (PET) using a vacuum metallization process. VMPET combines the flexibility of plastic film with the properties of metal, and its aluminum coating provides light-shielding and UV protection, effectively blocking oxygen and water vapor.

[0120] Tin-plated film and nickel-plated film are composite films formed by depositing a tin layer or a nickel layer on the surface of a plastic film substrate through a vacuum plating process. They also have the high barrier properties and heat radiation suppression properties unique to metal layers.

[0121] The metal layer of the metallized film 422 can act as a sacrificial layer to provide moisture and corrosion protection. When external moisture or corrosive substances come into contact with the surface of the metallized film 422, they preferentially react with the metal layer, thereby protecting the internal battery pack structure and other layers of the insulation structure 4 from corrosion. At the same time, the metal layer itself has a low infrared emissivity, which can effectively suppress thermal radiation and reduce the amount of heat dissipated from the battery pack to the outside through radiation.

[0122] Optionally, bubble bag 41 includes at least one of PP bubble bag 41, PE bubble bag 41, PC bubble bag 41 and PET bubble bag 41.

[0123] "PP bubble bag 41", "PE bubble bag 41", "PC bubble bag 41", and "PET bubble bag 41" refer to hollow, sac-like bubble structures with an internal static air layer, made from polypropylene (PP), polyethylene (PE), polycarbonate (PC), and polyethylene terephthalate (PET) films as the base material, manufactured through hot pressing or vacuum forming processes. All of these materials are thermoplastic polymer films, but their flexibility, temperature resistance range, mechanical strength, and cost differ, allowing for flexible selection based on actual working conditions. For example, when the ambient temperature is low, such as below -30°C, PE bubble bag 41 or PP bubble bag 41 with good cold resistance can be selected to avoid breakage due to low-temperature embrittlement. If the installation space is limited and high stacking pressure needs to be withstood, PC bubble bag 41 or PET bubble bag 41 with higher compressive strength can be selected.

[0124] In these embodiments, the metallized film 422 serves as the intermediate layer of the composite cover film 42. On the one hand, it utilizes the low infrared emissivity of its metal layer to suppress heat radiation and reduce heat loss from the battery pack. On the other hand, it uses the metal layer as a sacrificial layer to provide moisture-proof and corrosion-proof functions, thereby improving the service life and reliability of the insulation structure 4 in complex environments. PP, PE, PC, and PET can all be used as molding materials for the bubble bag 41, which can block heat convection and reduce heat conduction.

[0125] In some embodiments, the connecting layer 421 includes a heat-sealing connecting layer, and the composite cover film 42 is connected to the bubble bag 41 through the heat-sealing connecting layer.

[0126] A heat-sealing bonding layer is an intermediate functional layer that has thermoplastic properties and can melt under heating and pressure conditions to fuse or bond with adjacent layers (such as the film layer of a bubble bag) through intermolecular fusion, thereby forming a strong bond.

[0127] For example, the heat-sealing bonding layer can be a chlorinated polyethylene (CPE) layer. As an extension of this embodiment, the heat-sealing bonding layer can also be an ethylene-vinyl acetate copolymer (EVA) layer, a polyethylene (PE) layer, a polypropylene (PP) layer, a polyolefin elastomer (POE) layer, or a composite heat-sealing layer formed by blending and modifying the above materials. Any polymer film layer that has heat-sealing properties and can form a reliable heat-sealing bond with the bubble bag material can be used as an alternative.

[0128] In these embodiments, the heat-sealing composite method eliminates the need for additional adhesive coating, which simplifies the preparation process, reduces manufacturing costs, and avoids the risk of interlayer separation caused by adhesive aging and failure due to long-term use. At the same time, the heat-sealed bonding layer itself has good water resistance and chemical corrosion resistance, which can play an auxiliary role in moisture and corrosion prevention for the overall insulation structure while connecting the cover film and bubble bag, further improving the long-term reliability of the insulation structure in the complex environment at the bottom of the battery pack.

[0129] In some embodiments, the heat-sealing bonding layer includes a chlorinated polyethylene layer.

[0130] CPE (chlorinated polyethylene) is a polymer material obtained by chlorination modification of polyethylene and possesses excellent heat-sealing properties. CPE film has a low heat-sealing initiation temperature, high heat-sealing strength, and excellent dimensional stability. In addition, CPE also has good heat resistance, ozone resistance, weather resistance, aging resistance, and resistance to corrosive media such as acids, alkalis, and salts.

[0131] Optionally, the CPE layer can be directly used as a heat-sealing bonding layer between the metallized film 422 and the bubble bag 41. In the preparation process of the thermal insulation structure 4, the matte film 423, the metallized film 422 and the CPE layer are first combined to form a composite cover film 42. Then, using the heat-sealing properties of the CPE layer, the CPE layer is heat-sealed together with one side of the bubble structure 412 of the bubble bag 41 by hot pressing to form a complete thermal insulation structure 4.

[0132] In these embodiments, the heat-sealing bonding layer includes a CPE layer, which utilizes its excellent heat-sealing performance to achieve a strong bond between the composite cover film 42 and the bubble bag 41 without the need for additional adhesives, simplifying the preparation process and avoiding interlayer separation problems caused by adhesive aging and failure; at the same time, the CPE layer itself has good corrosion resistance, which can further improve the overall weather resistance of the insulation structure 4.

[0133] In some embodiments, the thickness of the metallized film 422 is greater than or equal to 5 micrometers and less than or equal to 20 micrometers. For example, the thickness of the metallized film 422 can be 5 micrometers, 8 micrometers, 12 micrometers, 15 micrometers, or 20 micrometers. The thickness of the metallized film 422 can be non-destructively measured by scanning electron microscopy or X-ray fluorescence thickness gauge on the film cross-section or surface. Before measurement, a standard sample block needs to be calibrated, and the arithmetic mean is taken after uniformly selecting no fewer than 5 detection points on the film surface.

[0134] Optionally, the thickness of the connecting layer 421 is greater than or equal to 15 micrometers and less than or equal to 30 micrometers. For example, the thickness of the connecting layer 421 can be 15 micrometers, 18 micrometers, 24 micrometers, 28 micrometers, or 30 micrometers. The thickness of the connecting layer 421 can be measured using a thin film thickness gauge, taking the arithmetic mean of at least five uniformly selected measurement points on the film surface.

[0135] In these embodiments, the thickness range of the metallized film 422 ensures that it has sufficient moisture-proof, corrosion-proof, and heat radiation suppression effects, while controlling material costs and overall thickness. The thickness range of the connecting layer 421 ensures sufficient heat-sealing strength, ensuring a firm and reliable connection between the composite cover film 42 and the bubble bag 41, while avoiding excessive thickness from affecting the flexibility and fit of the overall insulation structure 4.

[0136] Reference Figure 10 In some embodiments, the insulation structure 4 includes at least two layers of bubble bags 41, which are stacked sequentially between the composite cover film 42 and the battery pack.

[0137] At least two layers of bubble wrap 41 refers to two or more independently formed bubble wrap layers 41 stacked sequentially from the inside to the outside along the thickness direction Z of the insulation structure 4, forming a multi-layer air insulation layer assembly. The multiple layers of bubble wrap 41 can be fixed together by heat sealing spot welding, adhesive bonding, or by heat pressing with a composite cover film 42. Optionally, different layers of bubble wrap 41 can be made of different base materials.

[0138] When the thickness of a single bubble bag 41 is insufficient to meet the insulation performance requirements, two or more layers of bubble bags 41 can be stacked to increase the total thickness of the air insulation layer and further improve the insulation effect.

[0139] Optionally, the thickness of the single-layer bubble bag 41 is less than or equal to 3 mm. The thickness of the single-layer bubble bag 41 refers to the total thickness of the bubble bag 41 from the outer surface of the flat layer 411 to the top of the cavitation structure 412. For example, the thickness of the single-layer bubble bag 41 can be 1.0 mm, 1.5 mm, 2.0 mm, 2.5 mm, or 3 mm. The thickness of the bubble bag 41 can be measured by contact measurement using a low-contact pressure thickness gauge, or by non-contact image measurement of its cross-section using an optical image measuring instrument.

[0140] Optionally, the total thickness of at least two layers of bubble wrap 41 is greater than or equal to 2 mm and less than or equal to 10 mm. For example, 2 mm, 3 mm, 4 mm, 6 mm, or 10 mm.

[0141] The total thickness of the bubble wrap 41 in the insulation structure 4 can be selected according to the actual insulation requirements. Generally speaking, a total thickness in the range of 2mm to 10mm can cover the insulation requirements of most application scenarios. When the total thickness is less than 3mm, a single layer of bubble wrap 41 is sufficient; when the total thickness is between 3mm and 6mm, two layers of bubble wrap 41 can be stacked; when the total thickness is between 6mm and 10mm, three or more layers of bubble wrap 41 can be stacked, and so on.

[0142] It should be noted that when multiple layers of bubble bags 41 are stacked, the layers of bubble bags 41 can be fixed by heat sealing, gluing or physical stacking. Preferably, the layers of bubble bags 41 are combined into one by heat sealing to ensure that the interlayer connection is firm and there is no relative slippage.

[0143] In these embodiments, by setting one or more bubble bags 41, the total thickness of the bubble bags 41 can be flexibly adjusted according to the insulation requirements of different battery packs. The multi-layer air insulation layer formed by stacking multiple bubble bags 41 can further improve the effect of blocking heat convection and reducing heat conduction.

[0144] In this embodiment, the thermal insulation structure 4 can be die-cut to match the shape of the outer surface of the battery pack. Die-cutting refers to cutting the thermal insulation structure 4 into a shape that matches the contour of the outer surface of the battery pack by using a die to punch it according to the three-dimensional shape of the outer surface of the battery pack, ensuring that the thermal insulation structure 4 can fit tightly to the outer surface of the battery pack and achieve maximum coverage.

[0145] In practical applications, the outer surface of the battery pack has a complex morphology, potentially containing protruding reinforcing ribs, mounting lugs, pipe interfaces, and other structures that are difficult to cover with a large-area insulation structure 4. For these areas where the insulation structure 4 cannot be directly attached, supplementary insulation materials (such as foam) can be used to fill the gaps, ensuring effective insulation coverage of the entire outer surface of the battery pack and minimizing heat loss. For example, the foam material can be DPF (expanded polypropylene / foamed material), a lightweight porous insulation material with good insulation performance and plasticity, capable of filling irregular gaps on the outer surface of the battery pack, forming a complete insulation coverage system together with the insulation structure 4.

[0146] Reference Figures 5 to 10 Secondly, embodiments of this application provide a thermal insulation structure 4, including a bubble bag 41 and a composite cover film 42; the composite cover film 42 is disposed on one side of the bubble bag 41, and the composite cover film 42 includes a connecting layer 421 and a metallized film 422 sequentially stacked along a direction away from the bubble bag 41, the connecting layer 421 being connected to the bubble bag 41. This thermal insulation structure 4 can be any of the thermal insulation structures described in the first aspect above.

[0147] Thirdly, embodiments of this application provide an electrical device including a battery device 100 of any of the first aspects described above, the battery device 100 being used to provide electrical energy; or including the heat insulation structure 4 of the second aspect described above, the heat insulation structure 4 being not limited to being used in the battery device 100, but can also be used to cover other structures in the electrical device that require heat insulation.

[0148] The electrical equipment can be any of the aforementioned devices or systems that utilize battery devices 100.

[0149] Please see Figures 1 to 10According to some embodiments of this application, this application provides a battery device 100, which includes a battery pack and a thermal insulation structure 4. The thermal insulation structure 4 is attached to at least one side surface of the battery pack. The thermal insulation structure 4 includes a bubble bag 41 and a composite cover film 42. The bubble bag 41 is disposed on at least one side surface of the battery pack. The composite cover film 42 includes a connecting layer 421 and a metallized film 422 sequentially stacked in a direction away from the battery pack. The connecting layer 421 is connected to the bubble bag 41. The bubble bag 41 includes a flattening layer 411. The composite cover film 42 has multiple cavitation structures 412 protruding from the leveling layer 411 toward the composite cover film 42. The leveling layer 411 is bonded to the battery pack by an adhesive backing. The composite cover film 42 also includes a matte film 423, which is disposed on the side of the metallized film 422 away from the bubble bag 41. The matte film 423 includes a BOPP matte film 423. The metallized film 422 includes a polyester aluminized film. The connecting layer 421 includes a heat-sealing connecting layer. The composite cover film 42 is connected to the bubble bag 41 through the heat-sealing connecting layer. The heat-sealing connecting layer includes a chlorinated polyethylene layer.

[0150] Although this application has been described with reference to preferred embodiments, various modifications can be made thereto and components can be replaced with equivalents without departing from the scope of this application. In particular, the technical features mentioned in the various embodiments can be combined in any manner, provided there is no structural conflict. This application is not limited to the specific embodiments disclosed herein, but includes all technical solutions falling within the scope of the claims.

Claims

1. A battery device, characterized in that, It includes a battery pack and a thermal insulation structure, wherein the thermal insulation structure is attached to at least one surface of the battery pack; The thermal insulation structure includes: Bubble bags are disposed on at least one surface of the battery pack; The composite cover film includes a connecting layer and a metal-plated film stacked sequentially in a direction away from the battery pack, wherein the connecting layer is connected to the bubble bag.

2. The battery device according to claim 1, characterized in that, The bubble bag includes a flattening layer and a plurality of cavitation structures protruding from the flattening layer toward the composite cover film.

3. The battery device according to claim 2, characterized in that, Multiple cavitation structures are spaced apart along the plane of the flattening layer, and the distance between two adjacent cavitation structures is less than or equal to 70 mm. And / or, the projected shape of the cavitation structure along the thickness direction of the insulation structure is circular or polygonal, and the diameter of the projected shape or the diameter of the circumscribed circle is less than or equal to 10 mm.

4. The battery device according to claim 2, characterized in that, The smoothing layer is bonded to the battery pack using adhesive backing.

5. The battery device according to claim 1, characterized in that, The composite cover film also includes a matte film, which is disposed on the side of the metallized film opposite to the bubble bag.

6. The battery device according to claim 5, characterized in that, The thickness of the matte film is greater than or equal to 5 micrometers and less than or equal to 23 micrometers; And / or, the matte film includes at least one of BOPP matte film, PP matte film, PC matte film and PET matte film.

7. The battery device according to claim 1, characterized in that, The metallized film includes at least one of polyester aluminum-plated film, tin-plated film and nickel-plated film; And / or, the bubble bags include at least one of PP bubble bags, PE bubble bags, PC bubble bags, and PET bubble bags.

8. The battery device according to claim 1, characterized in that, The connecting layer includes a heat-sealing connecting layer, and the composite cover film is connected to the bubble bag through the heat-sealing connecting layer.

9. The battery device according to claim 8, characterized in that, The heat-sealing bonding layer includes a chlorinated polyethylene layer.

10. The battery device according to any one of claims 1 to 9, characterized in that, The thickness of the metal-coated film is greater than or equal to 5 micrometers and less than or equal to 20 micrometers; And / or, the thickness of the connecting layer is greater than or equal to 15 micrometers and less than or equal to 30 micrometers.

11. The battery device according to any one of claims 1 to 9, characterized in that, The thermal insulation structure includes at least two layers of bubble bags, which are stacked sequentially between the composite cover film and the battery pack. Wherein, the thickness of a single layer of the bubble bag is less than or equal to 3 mm; And / or, the total thickness of at least two layers of the bubble wrap is greater than or equal to 2 mm and less than or equal to 10 mm.

12. A thermal insulation structure, characterized in that, include: bubble wrap; A composite cover film is disposed on one side of the bubble bag. The composite cover film includes a connecting layer and a metallized film stacked sequentially in a direction away from the bubble bag. The connecting layer is connected to the bubble bag.

13. An electrical appliance, characterized in that, The battery device includes any one of claims 1 to 11, the battery device being used to provide electrical energy; or it includes the thermal insulation structure of claim 12.

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