Battery device and electric device

Abstract

The embodiment of the utility model provides a battery device and a power utilization device. The battery device comprises a box body, a battery monomer assembly and a heat insulation part, the battery monomer assembly is arranged in the box body and comprises a plurality of battery monomers which are sequentially arranged along a first direction; the heat insulation part is arranged between two adjacent battery monomers, the heat insulation part comprises a frame and a heat insulation body, and the frame is formed on the periphery of the heat insulation body through hot melting. And the frame is made of a polyurethane foaming material. According to the battery device, the heat insulation part is arranged between the two adjacent battery monomers, so that when one battery monomer is in thermal runaway, the heat insulation part can reduce the heat diffusion speed, the influence of the battery monomer in thermal runaway on the adjacent battery monomer is reduced, and the reliability of the battery device is improved. The frame is formed by the polyurethane foaming material, and compared with a frame formed by die cutting of other materials (such as silicon rubber), the frame is formed on the periphery of the heat insulation body in a hot melting mode, the utilization rate of the materials is improved, and cost is saved.

Description

Technical Field

[0001] This application relates to the field of battery manufacturing technology, and more specifically, to a battery device and an electrical device. Background Technology

[0002] Energy conservation and emission reduction are key to the sustainable development of the automotive industry, and electric vehicles, due to their energy-saving and environmentally friendly advantages, have become an important component of this sustainable development. For electric vehicles, battery technology is a crucial factor in their development.

[0003] In the development of battery technology, how to improve the reliability of battery devices is a technical problem that urgently needs to be solved. Utility Model Content

[0004] This application provides a battery device and an electrical device that can improve the reliability of the battery device.

[0005] This application is achieved through the following technical solution:

[0006] In a first aspect, this application provides a battery device, which includes a housing, a battery cell assembly, and a heat insulation component. The battery cell assembly is disposed within the housing and includes a plurality of battery cells arranged sequentially along a first direction. The heat insulation component is disposed between two adjacent battery cells and includes a frame and a heat insulation body. The frame is thermoformed around the outer periphery of the heat insulation body. The frame is made of polyurethane foam.

[0007] The technical solution of this application embodiment, by setting a heat insulation component between two adjacent battery cells, can reduce the rate of heat diffusion when one battery cell experiences thermal runaway, thereby reducing the impact of the thermally runaway battery cell on adjacent battery cells and improving the reliability of the battery device. By using polyurethane foam to form the frame, compared to using other materials (such as silicone rubber) to form the frame through die-cutting, and by thermally fusing the frame to the outer periphery of the heat insulation body, material utilization is improved, costs are saved, and the consistency of the frames formed in batches is enhanced. This also facilitates the adoption of automated processes and improves processing efficiency.

[0008] In some embodiments, the insulation component further includes a closure component that, along a first direction, closes the openings at both ends of the frame to form a closed first receiving cavity with the frame, and the insulation body is located within the first receiving cavity. The closure component is made of polyurethane foam.

[0009] The technical solution of this application embodiment forms a closed first receiving cavity to accommodate the heat insulation body through the sealing member and the frame, which helps to improve the reliability of the heat insulation body installation.

[0010] In some embodiments, the closure and the frame are integrally formed.

[0011] The technical solution of this application embodiment, compared with the method of hot-melting the frame to the outer periphery of the heat insulation body and then connecting the closure and the frame by other means (such as adhesive), improves the convenience and efficiency of connecting the closure and the frame by integrally molding the closure and the frame.

[0012] In some embodiments, the heat insulation component further includes a sealing film. Along the first direction, sealing films are provided on both sides of the heat insulation body. The sealing films are connected to the frame to jointly form a second receiving cavity for accommodating the heat insulation body.

[0013] The technical solution of this application embodiment forms a second receiving cavity to accommodate the heat insulation body by sealing the film and the frame, which helps to improve the reliability of the heat insulation body installation.

[0014] In some embodiments, the sealing film is made of one of polyimide and polyethylene terephthalate.

[0015] In the technical solutions of this application embodiment, polyimide has good insulation and high temperature resistance. By selecting polyimide to form the sealing film, the insulation and high temperature resistance of the sealing film are improved. Polyethylene terephthalate has low cost and is relatively easy to process. By selecting polyethylene terephthalate to form the sealing film, the processing difficulty of the sealing film is reduced, and costs are saved.

[0016] In some embodiments, the thickness of the sealing film along the first direction is d1, satisfying the condition: 0.02mm≤d1≤0.15mm.

[0017] In the technical solution of this application embodiment, the thickness of the sealing film satisfies the above conditions. When d1 ≥ 0.02 mm, it is easy to process, and after the heat insulation component is formed, the sealing film has good strength, reducing the risk of the sealing film being damaged during transportation or installation. When d1 ≤ 0.15 mm, the thickness of the sealing film is small, which can reduce the space occupied by the sealing film in the first direction, which is conducive to improving the space utilization of the housing, thereby improving the energy density of the battery device.

[0018] In some embodiments, the heat insulation body includes a heat insulation layer, which includes one of a phosphorus-nitrogen intumescent coating, paraffin wax, and a graphene composite.

[0019] The technical solution of this application embodiment has good thermal insulation performance. By selecting one of the phosphorus-nitrogen-based expansion coating, paraffin, and graphene composite to form a thermal insulation layer, it is beneficial to improve the thermal insulation performance of the thermal insulation body. When the battery cell is thermally runaway, the thermal insulation layer can reduce the rate of heat diffusion and reduce the impact of the thermally runaway battery cell on adjacent battery cells, which is beneficial to improve the reliability of the battery device.

[0020] In some embodiments, the thickness of the insulation layer along the first direction is d2, which satisfies: 0.3mm≤d2≤5mm.

[0021] In the technical solution of this application embodiment, the thickness of the heat insulation layer satisfies the above conditions. When d2 ≥ 0.3 mm, the thickness of the heat insulation layer is relatively large, and the heat insulation performance of the heat insulation layer is proportional to the thickness, which means that the heat insulation performance of the heat insulation layer is better. When a battery cell experiences thermal runaway, the heat insulation layer can reduce the rate of heat diffusion and reduce the impact of the thermally runaway battery cell on adjacent battery cells, thus improving the reliability of the battery device. When d2 ≤ 5 mm, the thickness of the heat insulation layer is relatively small, which can reduce the space occupied by the heat insulation layer in the first direction, thus improving the space utilization rate of the housing and thereby improving the energy density of the battery device.

[0022] In some embodiments, the heat insulation body further includes a heat radiation reflective layer, wherein the heat insulation layer is disposed on both sides of the heat radiation reflective layer in a first direction.

[0023] The technical solution of this application embodiment, by setting a thermal radiation emitting layer, helps to reduce the impact of thermal runaway battery cells on the thermal radiation of adjacent battery cells, reduces the rate of thermal diffusion, reduces the impact of thermal runaway battery cells on adjacent battery cells, and helps to improve the reliability of the battery device.

[0024] In some embodiments, the thermal radiation reflective layer comprises a multilayer composite film.

[0025] The technical solution of this application embodiment has good thermal radiation resistance of multilayer composite films. By selecting one of the multilayer composite films to form a thermal radiation reflective layer, it is beneficial to reduce the thermal radiation effect of thermal runaway battery cells on adjacent battery cells, reduce the rate of thermal diffusion, reduce the impact of thermal runaway battery cells on adjacent battery cells, and improve the reliability of battery devices.

[0026] In some embodiments, the thickness of the thermal radiation reflective layer along the first direction is d3, which satisfies: 0.2mm≤d3≤1mm.

[0027] In the technical solution of this application embodiment, the thickness of the thermal radiation reflective layer satisfies the above conditions. When d3 ≥ 0.2 mm, the thickness of the thermal radiation reflective layer is relatively large, and the thermal radiation resistance performance of the thermal radiation reflective layer is proportional to its thickness. This means that the thermal radiation resistance performance of the thermal radiation reflective layer is good. When a battery cell experiences thermal runaway, the thermal radiation reflective layer can reduce the rate of heat diffusion and reduce the impact of the runaway battery cell on adjacent battery cells, thus improving the reliability of the battery device. When d3 ≤ 1 mm, the thickness of the thermal radiation reflective layer is relatively small, which can reduce the space occupied by the thermal radiation reflective layer in the first direction, thereby improving the space utilization rate of the housing and thus improving the energy density of the battery device.

[0028] In some embodiments, the heat insulation body further includes an insulating flame-retardant layer, which is disposed between the heat insulation layer and the heat radiation reflective layer in a first direction.

[0029] The technical solution of this application embodiment provides an insulating flame-retardant layer between the heat insulation layer and the heat radiation reflective layer. When a battery cell catches fire, the insulating flame-retardant layer can reduce the speed of flame spread, reduce the impact of the burning battery cell on adjacent battery cells, and reduce the risk of short circuits in adjacent battery cells, thereby improving the reliability of the battery device.

[0030] In some embodiments, the insulating and flame-retardant layer is made of ceramic fiber.

[0031] In the technical solution of this application embodiment, ceramic fiber has good insulation and flame retardant properties. By selecting ceramic fiber to form an insulating and flame retardant layer, it is beneficial to reduce the impact of a burning battery cell on adjacent battery cells, and at the same time reduce the risk of short circuits in adjacent battery cells, thereby improving the reliability of the battery device.

[0032] In some embodiments, the thickness of the insulating flame-retardant layer along the first direction is d4, satisfying: 0.1mm≤d4≤1mm.

[0033] In the technical solution of this application embodiment, the thickness of the insulating flame-retardant layer satisfies the above conditions. When d4 ≥ 0.1 mm, the thickness of the insulating flame-retardant layer is relatively large, and the insulation and flame-retardant properties of the insulating flame-retardant layer are proportional to the thickness. This means that the insulation and flame-retardant properties of the insulating flame-retardant layer are good, which helps to reduce the impact of a burning battery cell on adjacent battery cells and reduces the risk of short circuits in adjacent battery cells, thereby improving the reliability of the battery device. When d4 ≤ 1 mm, the thickness of the insulating flame-retardant layer is relatively small, which can reduce the space occupied by the insulating flame-retardant layer in the first direction, which helps to improve the space utilization of the housing, thereby helping to improve the energy density of the battery device.

[0034] In some embodiments, the porosity of the insulating flame-retardant layer is less than that of the heat insulation layer.

[0035] The technical solution of this application embodiment sets the porosity of the insulating flame-retardant layer to be less than that of the heat insulation layer, so that the insulating flame-retardant layer has better flame-retardant performance. When the flame passes through the heat insulation layer, the insulating flame-retardant layer can effectively prevent the spread of fire, reduce the impact of the burning battery cell on adjacent battery cells, and help improve the reliability of the battery device.

[0036] Secondly, this application provides an electrical device, including a battery device as described in any embodiment of the first aspect, the battery device being used to provide electrical energy to the electrical device.

[0037] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description

[0038] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 This application provides structural schematic diagrams of vehicles for some embodiments;

[0040] Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application;

[0041] Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application;

[0042] Figure 4 This is a schematic diagram illustrating the interaction between a battery cell and a heat insulation component according to some embodiments of this application;

[0043] Figure 5 This is an exploded view of the structure of the heat insulation component provided in some embodiments of this application;

[0044] Figure 6 This is a schematic diagram of the internal structure of the heat insulation component provided in some embodiments of this application;

[0045] Figure 7 Schematic diagram of the internal structure of the heat insulation component provided in other embodiments of this application;

[0046] Figure 8 Schematic diagram of the internal structure of the heat insulation component provided in some embodiments of this application;

[0047] Figure 9 A schematic diagram of a heat insulation body provided in some embodiments of this application;

[0048] Figure 10 A schematic diagram of a heat insulation body provided for other embodiments of this application;

[0049] Figure 11 This is a schematic diagram of a heat insulation body provided for some embodiments of this application.

[0050] Icons: 1-Battery unit; 10-Casing; 11-First sub-casing; 12-Second sub-casing; 20-Battery cell assembly; 21-Battery cell; 211-Outer shell; 2111-Housing shell; 2112-End cap; 212-Electrode assembly; 213-Electrode terminal; 30-Insulation component; 31-Frame; 311-Opening; 32-Insulation body; 321-Insulation layer; 322-Heat radiation reflective layer; 323-Insulating and flame-retardant layer; 33-Sealing component; 34-First receiving cavity; 35-Sealing film; 36-Second receiving cavity; 100-Vehicle; 110-Controller; 120-Motor; X-First direction. Detailed Implementation

[0051] 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 and completely 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.

[0052] 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.

[0053] In this application, the reference to "embodiment" means that a specific feature, structure, or characteristic described in connection with an embodiment may be included in 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 mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described in this application can be combined with other embodiments.

[0054] 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.

[0055] 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, "second circuit board and / or first circuit board" can represent three cases: the second circuit board exists alone, the second circuit board and the first circuit board exist simultaneously, or the first circuit board exists alone. Additionally, in this application, the character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0056] In this application, "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0057] The battery device 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, which are connected in series, parallel, or mixed connections via a busbar.

[0058] In some embodiments, a battery cell assembly is typically formed by arranging multiple battery cells; as an example, a battery cell assembly can be a battery module, which is formed by arranging and fixing multiple battery cells into a single module. As an example, a battery module can be formed by bundling multiple battery cells together with cable ties.

[0059] In some embodiments, the battery device may be a battery pack, which includes a housing and one or more individual battery cell assemblies housed within the housing.

[0060] As an example, the battery cell assembly can be a battery module, which can be housed in a housing by fixing the battery module in the housing.

[0061] As an example, battery cell assemblies can also be housed in a housing by directly fixing multiple battery cells to the housing.

[0062] As an example, the enclosure may include a first sub-enclosure and a second sub-enclosure. The first and second sub-enclosures are interlocked to form a closed space inside the enclosure to house the individual battery cells. Here, "closed" refers to covering or shutting down; it can be sealed or not sealed. The first sub-enclosure may be a top cover or a bottom plate.

[0063] As an example, the enclosure may include a top cover, a frame, and a bottom plate. The top cover and bottom plate are connected to the frame, creating an enclosed space inside the enclosure to house the individual battery cells.

[0064] As an example, the box body can be part of the vehicle's chassis structure. For instance, the box body's roof can be part of the vehicle's floor, or the box body's frame can be part of the vehicle's crossbeams and longitudinal beams.

[0065] In some embodiments, the battery device refers to an energy storage device, which includes a housing with a door on one side. Energy storage devices include energy storage containers, energy storage cabinets, etc.

[0066] In this embodiment of the application, the battery cell can be a secondary battery, which refers to a battery cell that can be recharged to activate the active materials and continue to be used after the battery cell has been discharged.

[0067] The battery cell may be, but is not limited to, lithium-ion battery, sodium-ion battery, sodium-lithium-ion battery, lithium metal battery, sodium metal battery, lithium-sulfur battery, magnesium-ion battery, nickel-metal hydride battery, nickel-cadmium battery, lead-acid battery, etc.

[0068] A single battery cell typically includes an electrode assembly. The electrode assembly includes a positive electrode, a negative electrode, and a separator. During the charging and discharging process of a single battery cell, active ions (such as lithium ions) repeatedly insert and extract between the positive and negative electrodes. The separator, positioned between the positive and negative electrodes, prevents short circuits while allowing active ions to pass through.

[0069] In some embodiments, the positive electrode can be a positive electrode sheet, which may include a positive current collector and a positive active material disposed on one surface of the positive current collector.

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

[0071] As an example, the positive electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, carbon, nickel, or titanium, etc. Composite current collectors can include a polymer material base layer and a metal layer. Composite current collectors can be formed by forming a metal material (aluminum, aluminum alloy, nickel, nickel alloy, titanium, titanium alloy, silver and silver alloy, etc.) on a polymer material substrate (such as a substrate of polypropylene, polyethylene terephthalate, polybutylene terephthalate, polystyrene, polyethylene, etc.).

[0072] As an example, the positive electrode active material may include one of the following: lithium phosphate, lithium transition metal oxide, and their respective modified compounds. However, this application is not limited to these materials, and other conventional materials that can be used as positive electrode active materials for batteries may also be used.

[0073] In some embodiments, the negative electrode can be a negative electrode sheet, and the negative electrode sheet can include a negative current collector.

[0074] As an example, the negative electrode current collector can be a metal foil or a composite current collector. For example, as a metal foil, it can be aluminum with a silver-plated surface, stainless steel with a silver-plated surface, stainless steel, copper, aluminum, nickel, carbon electrode, or made of carbon, nickel, or titanium, etc.

[0075] In some embodiments, the negative electrode current collector has two surfaces opposite each other in its own thickness direction, and the negative electrode active material is disposed on either or both of the two opposite surfaces of the negative electrode current collector.

[0076] As an example, the negative electrode active material may be any negative electrode active material known in the art for use in batteries. For example, the negative electrode active material may include one of the following materials: artificial graphite, natural graphite, soft carbon, hard carbon, silicon-based materials, tin-based materials, and lithium titanate, etc. Silicon-based materials may be selected from elemental silicon, silicon oxide compounds, silicon-carbon composites, silicon-nitrogen composites, and silicon alloys. Tin-based materials may be selected from elemental tin, tin oxide compounds, and tin alloys. However, this application is not limited to these materials, and other conventional materials that can be used as negative electrode active materials for batteries may also be used. These negative electrode active materials may be used alone or in combination of two or more.

[0077] In some embodiments, the separator is a diaphragm. This application does not impose any particular limitation on the type of diaphragm; any known porous diaphragm with good chemical and mechanical stability can be selected.

[0078] As an example, the main material of the separator can be selected from glass fiber, non-woven fabric, polyethylene, polypropylene, polyvinylidene fluoride, and ceramics. The separator can be a single-layer film or a multi-layer composite film, without particular restrictions. When the separator is a multi-layer composite film, the materials of each layer can be the same or different, without particular restrictions. The separator can be a separate component located between the positive and negative electrodes, or it can be attached to the surfaces of the positive and negative electrodes.

[0079] In some embodiments, the separator is a solid electrolyte. The solid electrolyte is disposed between the positive and negative electrodes, serving both to transport ions and to isolate the positive and negative electrodes.

[0080] In some implementations, the electrode assembly is a wound structure. The positive and negative electrode sheets are wound into a wound structure.

[0081] In some implementations, the electrode assembly is a stacked structure.

[0082] In some embodiments, the battery cell may include a housing. The housing is used to encapsulate components such as electrode assemblies and electrolytes. The housing may be made of steel, aluminum, plastic (such as polypropylene), composite metal (such as copper-aluminum composite), or aluminum-plastic film, etc.

[0083] In some embodiments, the housing includes an end cap and a casing, the casing having an opening, and the end cap closing the opening to form a sealed space for accommodating substances such as electrode assemblies and electrolytes. The casing may have one or more openings. The end cap may also be provided one or more times.

[0084] In some embodiments, an electrode terminal is provided on the housing, and the electrode terminal is electrically connected to the tab of the electrode assembly. The electrode terminal can be directly connected to the tab or indirectly connected to the tab via an adapter. The electrode terminal can be located on the end cap or on the housing.

[0085] In some implementations, an explosion-proof valve is provided on the housing. The explosion-proof valve is used to release the internal pressure of the battery cells.

[0086] In some embodiments, the housing can be a sealed structure or a non-sealed structure. As an example, when the housing is a sealed structure, it protects the electrode assembly and prevents leaks such as electrolyte leakage. When the housing is a non-sealed structure, it protects the electrode assembly, and a sealing bag may be included between the housing and the electrode assembly to encapsulate the electrode assembly and electrolyte. Specifically, the sealing bag can be a bag-shaped insulating material or an aluminum-plastic film.

[0087] As an example, a battery cell can be a prismatic 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.

[0088] Currently, judging from market trends, battery devices are widely used in electric vehicles such as electric bicycles, electric motorcycles, and electric cars, as well as in power tools, drones, energy storage equipment, and many other fields. As the application areas for batteries continue to expand, the market demand is also constantly increasing.

[0089] The development of battery technology must take into account multiple design factors, such as energy density, cycle life, discharge capacity, charge-discharge rate and other performance parameters. In addition, the reliability of battery devices is also a key consideration as environmental and / or internal battery conditions change.

[0090] During transportation or use, individual battery cells may be at risk of thermal runaway (when high-temperature gas, liquid or impurities generated by the battery cell assembly are ejected from the casing) or fire, which may affect adjacent battery cells and result in poor reliability of the battery device.

[0091] Therefore, to reduce the risk of thermal runaway or fire in a single battery cell affecting adjacent cells, a heat insulation component is typically installed between two adjacent battery cells. This heat insulation component includes a heat insulation body and an outer frame fitted around the heat insulation body to secure it. Existing frames are usually made of materials such as silicone or rubber. These materials are manufactured into sheet-like parts, then die-cut to form the frame, which is then fitted onto the outer periphery of the heat insulation body.

[0092] However, due to the die-cut frame, the material cut off cannot be reused, resulting in material waste and higher costs for insulation components.

[0093] Based on the above considerations, in order to solve the problems of thermal runaway or fire of battery cells, resulting in poor reliability of the battery device and high cost of the heat insulation component, this application provides a battery device, which includes a housing, battery cells, and a heat insulation component. The battery cells are disposed within the housing, and the battery cells include multiple battery cells arranged sequentially along a first direction. The heat insulation component is disposed between two adjacent battery cells, and includes a frame and a heat insulation body. The frame is thermally fused to the outer periphery of the heat insulation body. The frame is made of polyurethane foam.

[0094] The technical solution of this application embodiment, by setting a heat insulation component between two adjacent battery cells, can reduce the rate of heat diffusion when one battery cell experiences thermal runaway, thereby reducing the impact of the thermally runaway battery cell on adjacent battery cells and improving the reliability of the battery device. By using polyurethane foam to form the frame, compared to using other materials (such as silicone rubber) to form the frame through die-cutting, and by thermally fusing the frame to the outer periphery of the heat insulation body, material utilization is improved, costs are saved, and the consistency of the frames formed in batches is enhanced. This also facilitates the adoption of automated processes and improves processing efficiency.

[0095] The technical solutions described in the embodiments of this application are applicable to various electrical devices that use battery cells and battery devices. Electrical devices may include mobile phones, portable devices, laptops, electric vehicles, electric toys, power tools, vehicles, ships, and spacecraft, such as aircraft, rockets, space shuttles, and spacecraft.

[0096] For ease of explanation, the following embodiments will be described using a vehicle as an example of an electrical device according to an embodiment of this application.

[0097] Please refer to Figure 1 , Figure 1This is a schematic diagram of the structure of a vehicle provided in some embodiments of this application. The vehicle 100 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 1 is installed inside the vehicle 100, and the battery device 1 can be located at the bottom, front, or rear of the vehicle 100. The battery device 1 can be used to power the vehicle 100; for example, the battery device 1 can serve as the operating power source for the vehicle 100's electrical system, such as meeting the power requirements for starting, navigation, and operation of the vehicle 100.

[0098] The vehicle 100 may also include a controller 110 and a motor 120. The controller 110 is used to control the battery device 1 to supply power to the motor 120, for example, for the power needs of the vehicle 100 during startup, navigation and driving.

[0099] In some embodiments of this application, the battery device 1 can not only serve as the operating power source of the vehicle 100, but also as the driving power source of the vehicle 100, replacing or partially replacing fuel or natural gas to provide driving power for the vehicle 100.

[0100] The battery device includes battery cell modules and a power management system. The battery management system is connected to the battery cell modules and is used to manage the charging and discharging of the battery cell modules.

[0101] Please refer to Figure 2 , Figure 2 This is an exploded view of the structure of a battery device provided in some embodiments of this application. The battery device 1 may include a housing 10 and a battery cell 21, with the battery cell 21 housed within the housing 10.

[0102] The housing 10 provides a space for housing the battery cell 21, and the housing 10 can adopt various structures. In some embodiments, the housing 10 may include a first sub-housing 11 and a second sub-housing 12, which overlap each other, and together define a space for housing the battery cell 21. The first sub-housing 11 may be a hollow structure with one open end, and the second sub-housing 12 may be a plate-like structure, which overlaps the open side of the first sub-housing 11 so that the first sub-housing 11 and the second sub-housing 12 together define the space; the first sub-housing 11 and the second sub-housing 12 may also be hollow structures with one open side, and the open side of the first sub-housing 11 overlaps the open side of the second sub-housing 12.

[0103] In the battery device 1, there can be multiple battery cells 21, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 21 are connected in both series and parallel configurations. Multiple battery cells 21 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 21 is housed within the housing 10. Alternatively, the battery device 1 can also consist of multiple battery cells 21 first connected in series, parallel, or in a mixed manner to form battery modules, and then these battery modules are connected in series, parallel, or in a mixed manner to form a whole, which is also housed within the housing 10. The battery device 1 may also include other structures; for example, it may include a busbar component for electrical connection between the multiple battery cells 21.

[0104] Please refer to Figure 3 , Figure 3 This is an exploded view of the structure of a battery cell provided in some embodiments of this application. For example... Figure 3 As shown, the battery cell 21 includes a housing 211, an electrode assembly 212, and electrode terminals 213. The housing 211 includes a shell 2111 and an end cap 2112. The shell 2111 has an opening, and the end cap 2112 closes the opening to isolate the internal environment of the battery cell 21 from the external environment.

[0105] The housing 2111 is a component used to cooperate with the end cap 2112 to form the internal environment of the battery cell 21, wherein the formed internal environment can accommodate the electrode assembly 212, electrolyte, and other components. The housing 2111 and the end cap 2112 can be independent components. The housing 2111 can have various shapes and sizes. Specifically, the shape of the housing 2111 can be determined according to the specific shape and size of the electrode assembly 212. The housing 2111 can be made of various materials, such as copper, iron, aluminum, stainless steel, aluminum alloy, and plastic.

[0106] End cap 2112 refers to a component that covers the opening of housing 2111 to isolate the internal environment of battery cell 21 from the external environment. The shape of end cap 2112 can be adapted to the shape of housing 2111 to fit it. Optionally, end cap 2112 can be made of a material with certain hardness and strength (such as aluminum alloy), so that end cap 2112 is not easily deformed under pressure and impact, giving battery cell 21 higher structural strength and improved reliability. Functional components such as electrode terminals can be provided on end cap 2112. Electrode terminals can be used for electrical connection with electrode assembly 212 to output or input electrical energy to battery cell 21. The material of end cap 2112 can also be various, such as copper, iron, aluminum, stainless steel, aluminum alloy, plastic, etc., and this application embodiment does not impose special limitations on this. In some embodiments, an insulating structure may be provided on the inner side of the end cap 2112. The insulating structure can be used to isolate the electrical connection components within the housing 2111 from the end cap 2112 to reduce the risk of short circuits. For example, the insulating structure may be made of plastic, rubber, etc.

[0107] Please refer to Figure 2 and Figure 3 and refer to Figures 4 to 6 , Figure 4 This is a schematic diagram illustrating the interaction between a battery cell and a heat insulation component according to some embodiments of this application. Figure 5 This is an exploded view of the structure of the heat insulation component provided in some embodiments of this application. Figure 6 This is a schematic diagram of the internal structure of a heat insulation component provided in some embodiments of this application. Embodiments of this application provide a battery device 1, which includes a housing 10, a battery cell assembly 20, and a heat insulation component 30. The battery cell assembly 20 is disposed within the housing 10 and includes a plurality of battery cells 21 arranged sequentially along a first direction X. The heat insulation component 30 is disposed between two adjacent battery cells 21 and includes a frame 31 and a heat insulation body 32. The frame 31 is thermoformed around the outer periphery of the heat insulation body 32. The frame 31 is made of polyurethane foam.

[0108] In some embodiments, the first direction can be represented by the direction indicated by the letter X in the figure.

[0109] In some embodiments, the first direction X may be parallel to the length direction of the battery device 1.

[0110] In some embodiments, during the assembly process, the heat insulation component 30 can be processed first, and then the heat insulation component 30 can be disposed on one side of the first battery cell 21 in the first direction X, and then the second battery cell 21 can be disposed on the side of the heat insulation component 30 away from the first battery cell 21 in the first direction X, so that the heat insulation component 30 is located between the two battery cells 21.

[0111] Alternatively, multiple battery cells 21 can be arranged at intervals, then a heat insulation component 30 can be placed between two adjacent battery cells 21, and finally the multiple battery cells 21 can be fixed by a strapping component so that two adjacent battery cells 21 are in contact with the heat insulation component 30 located between the two battery cells 21.

[0112] In some embodiments, the heat insulation element 30 may contact the large surface of the battery cell 21. The large surface is the surface of the battery cell 21 with the largest surface area.

[0113] In some embodiments, the heat insulation component 30 can be formed by first forming the heat insulation body 32, then placing the heat insulation body 32 in a mold, then melting the material of the frame 31 and pouring it into the mold, and finally molding the frame 31 around the heat insulation body 32 to form the heat insulation component 30.

[0114] In some embodiments, compared to the die-cut frame 31, the frame 31 is thermoformed around the outer periphery of the heat insulation body 32, and the connection between the frame 31 and the heat insulation body 32 is relatively smooth, with no burrs or few burrs.

[0115] In some embodiments, the frame 31 is made of polyurethane foam, which can be hot-melted and molded around the outer periphery of the heat insulation body 32.

[0116] In some embodiments, the heat insulation body 32 may be a plate-like component, the thickness direction of which may be parallel to the first direction X. The heat insulation body 32 has two end faces in the first direction X, and an outer peripheral surface surrounding the edges of the two end faces. The frame 31 may be formed on the outer peripheral surface of the heat insulation body 32.

[0117] In some embodiments, the frame 31 may be formed on an outer peripheral surface of the heat insulation body 32.

[0118] In some embodiments, the frame 31 may be formed on multiple outer peripheral surfaces of the heat insulation body 32.

[0119] In some embodiments, the frame 31 may be annular and surround the outer peripheral surface of the heat insulation body 32.

[0120] In some embodiments, the frame 31 may cover all areas of all outer peripheral surfaces of the insulation body 32.

[0121] The technical solution of this application embodiment, by setting a heat insulation component 30 between two adjacent battery cells 21, can reduce the rate of heat diffusion when one of the battery cells 21 experiences thermal runaway, thereby reducing the impact of the thermally runaway battery cell 21 on adjacent battery cells 21 and improving the reliability of the battery device 1. By using polyurethane foam material to form the frame 31, compared to using other materials (such as silicone rubber) to form the frame 31 through die-cutting, and by thermally melting the frame 31 onto the outer periphery of the heat insulation body 32, material utilization is improved, costs are saved, and the consistency of the batch-molded frame 31 is improved. This also facilitates the adoption of automated processes and improves processing efficiency.

[0122] Please refer to Figures 2 to 5 and refer to Figure 7 , Figure 7 This is a schematic diagram of the internal structure of a heat insulation component provided in other embodiments of this application. In some embodiments, the heat insulation component 30 further includes a closure component 33, which closes the openings 311 at both ends of the frame 31 along a first direction X, forming a closed first receiving cavity 34 with the frame 31, and the heat insulation body 32 is located within the first receiving cavity 34. The material of the closure component 33 includes polyurethane foam.

[0123] In some embodiments, the frame 31 may be annular, with openings 311 at both ends in the first direction X. The frame 31 surrounds the outer peripheral surface of the heat insulation body 32 and covers all areas of all outer peripheral surfaces of the heat insulation body 32.

[0124] In some embodiments, the material of the closure 33 is the same as the material of the frame 31.

[0125] In some embodiments, the closure 33 can be connected to the frame 31 in the following ways: the closure 33 and the frame 31 can be integrally formed; or the frame 31 can be hot-melted and formed around the outer periphery of the heat insulation body 32, and the closure 33 can be formed separately. The closure 33 can be connected to the frame 31 by hot-melt or adhesive bonding.

[0126] In some embodiments, the closure 33 may be plate-shaped, and its thickness direction may be parallel to the first direction X. There may be two closures 33, and the two closures 33 respectively close the openings 311 at both ends of the frame 31.

[0127] In some embodiments, in the first direction X, a first end of the frame 31 contacts a first battery cell 21, and a closure 33 disposed at the first end also contacts the first battery cell 21. A second end of the frame 31 contacts a second battery cell 21, and a closure 33 disposed at the second end also contacts the second battery cell 21. That is, in the first direction X, the first end of the frame 31 and the surface of the closure 33 at the first end facing the first battery cell 21 are flush, and the second end of the frame 31 and the surface of the closure 33 at the second end facing the second battery cell 21 are flush.

[0128] The technical solution of this application embodiment forms a closed first receiving cavity 34 with the closure member 33 and the frame 31 to accommodate the heat insulation body 32, which helps to improve the reliability of the heat insulation body 32.

[0129] Please refer to Figure 7 In some embodiments, the closure 33 and the frame 31 are integrally formed.

[0130] In some embodiments, the closure 33 and the frame 31 can be integrally formed by: placing the heat insulation body 32 in the mold, hot-melting the frame 31 onto the heat insulation body 32, and then forming the closure 33 at the opening 311 of the frame 31.

[0131] Alternatively, the heat insulation body 32 is placed in the mold and clamped by a jig, so that the heat insulation body 32 is located in the mold and spaced from the mold wall. Polyurethane foam material is melted and injected into the mold, so that the frame 31 and the closure 33 cover the outer surface of the heat insulation body 32. Then the jig is removed, and the part of the heat insulation body 32 held by the jig is injected with polyurethane foam material, so that the closure 33 and the frame 31 are melt-molded and molded to form a closed first receiving cavity 34.

[0132] The technical solution of this application embodiment, compared with the method of hot-melting the frame 31 to the outer periphery of the heat insulation body 32 and then connecting the closure 33 and the frame 31 by other means (such as adhesive), improves the convenience and efficiency of connecting the closure 33 and the frame 31 by integrally molding the closure 33 and the frame 31.

[0133] Please refer to Figures 2 to 5 and refer to Figure 8 , Figure 8 This is a schematic diagram of the internal structure of a heat insulation component provided in some embodiments of this application. In some embodiments, the heat insulation component 30 further includes a sealing film 35. Along the first direction X, sealing films 35 are provided on both sides of the heat insulation body 32. The sealing films 35 are connected to the frame 31 to jointly form a second receiving cavity 36 for accommodating the heat insulation body 32.

[0134] In some embodiments, the number of sealing films 35 can be two, and the two sealing films 35 respectively close the openings 311 at both ends of the frame 31.

[0135] In some embodiments, the sealing film 35 may be adhesively attached to the frame 31.

[0136] In some embodiments, the sealing film 35 can be attached to the surface of the frame 31 facing the battery cell 21, or it can be attached to the inner wall surface of the opening 311.

[0137] The technical solution of this application embodiment forms a second receiving cavity 36 to accommodate the heat insulation body 32 by means of a sealing film 35 and a frame 31, which helps to improve the reliability of the heat insulation body 32.

[0138] Please refer to Figure 8 In some embodiments, the material of the sealing film 35 includes one of polyimide and polyethylene terephthalate.

[0139] In some embodiments, the sealing film 35 may be made of polyimide.

[0140] In some embodiments, the sealing film 35 may be made of polyethylene terephthalate.

[0141] In the technical solutions of this application embodiment, polyimide has good insulation and high temperature resistance. By selecting polyimide to form the sealing film 35, the insulation and high temperature resistance of the sealing film 35 are improved. Polyethylene terephthalate has low cost and is relatively easy to process. By selecting polyethylene terephthalate to form the sealing film 35, the processing difficulty of the sealing film 35 is reduced, and costs are saved.

[0142] Please refer to Figure 8 In some embodiments, the thickness of the sealing film 35 along the first direction X is d1, which satisfies the condition: 0.02mm≤d1≤0.15mm.

[0143] In some embodiments, the thickness d1 of the sealing film 35 satisfies the above conditions. d1 can be any value among 0.02mm, 0.03mm, 0.04mm, 0.05mm, 0.06mm, 0.07mm, 0.08mm, 0.09mm, 0.1mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, and 0.15mm, or a value between any two values.

[0144] It should be noted that the above dimensions are the thickness before installation. After the sealing film 35 is installed between the battery cells 21, there may be compression deformation that causes changes in dimensions.

[0145] In the technical solution of this application embodiment, the thickness of the sealing film 35 satisfies the above conditions. When d1 ≥ 0.02 mm, it is easy to process, and after the heat insulation component 30 is formed, the sealing film 35 has good strength, reducing the risk of damage to the sealing film 35 during transportation or installation of the heat insulation component 30. When d1 ≤ 0.15 mm, the thickness of the sealing film 35 is small, which can reduce the space occupied by the sealing film 35 in the first direction X, which is conducive to improving the space utilization rate of the housing 10, thereby improving the energy density of the battery device 1.

[0146] Please refer to Figures 4 to 8 and refer to Figure 9 , Figure 9 This is a schematic diagram of a heat insulation body provided in some embodiments of this application. In some embodiments, the heat insulation body 32 includes a heat insulation layer 321, which includes one of a phosphorus-nitrogen intumescent coating, paraffin wax, and a graphene composite.

[0147] In some embodiments, the insulation layer 321 may be formed of paraffin wax.

[0148] In some embodiments, the heat insulation layer 321 may be formed of a graphene composite.

[0149] In some embodiments, the heat insulation layer 321 may be formed by coating the surface of ceramic fibers with a phosphorus-nitrogen-based expansion coating.

[0150] The technical solution of this application embodiment has good thermal insulation performance. By selecting one of the phosphorus-nitrogen-based expansion coating, paraffin, and graphene composite to form the thermal insulation layer 321, it is beneficial to improve the thermal insulation performance of the thermal insulation body 32. When the battery cell 21 thermally runs away, the thermal insulation layer 321 can reduce the rate of heat diffusion and reduce the impact of the thermally runaway battery cell 21 on the adjacent battery cells 21, which is beneficial to improve the reliability of the battery device 1.

[0151] Please refer to Figures 4 to 9 In some embodiments, the thickness of the insulation layer 321 along the first direction X is d2, which satisfies: 0.3mm≤d2≤5mm.

[0152] In some embodiments, the thickness d2 of the heat insulation layer 321 satisfies the above conditions. d2 can be any value among 0.3mm, 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm, 3.5mm, 4mm, 4.5mm, and 5mm, or a value between any two values.

[0153] It should be noted that the above dimensions are the thickness before installation. After the heat insulation layer 321 is installed between the battery cells 21, there may be compression deformation that causes changes in dimensions.

[0154] In the technical solution of this application embodiment, the thickness of the heat insulation layer 321 satisfies the above conditions. When d2 ≥ 0.3 mm, the thickness of the heat insulation layer 321 is relatively large, and the heat insulation performance of the heat insulation layer 321 is proportional to its thickness, which means that the heat insulation performance of the heat insulation layer 321 is better. When the battery cell 21 experiences thermal runaway, the heat insulation layer 321 can reduce the rate of heat diffusion and reduce the impact of the thermally runaway battery cell 21 on adjacent battery cells 21, which is beneficial to improving the reliability of the battery device 1. When d2 ≤ 5 mm, the thickness of the heat insulation layer 321 is relatively small, which can reduce the space occupied by the heat insulation layer 321 in the first direction X, which is beneficial to improving the space utilization rate of the housing 10, thereby improving the energy density of the battery device 1.

[0155] Please refer to Figures 4 to 8 and refer to Figure 10 , Figure 10 This is a schematic diagram of a heat insulation body provided in some other embodiments of this application. In some embodiments, the heat insulation body 32 further includes a heat radiation reflective layer 322, and in the first direction X, the heat insulation layer 321 is disposed on both sides of the heat radiation reflective layer 322.

[0156] In some embodiments, in the first direction X, the thermal radiation reflective layer 322 is located between two battery cells 21, and the thermal radiation reflective layer 322 has a first surface and a second surface. There are two thermal insulation layers 321, one thermal insulation layer 321 disposed on the first surface of the thermal radiation reflective layer 322, and the other thermal insulation layer 321 disposed on the second surface of the thermal radiation reflective layer 322.

[0157] In some embodiments, with the first direction X as the projection direction, the orthographic projection of the thermal radiation reflective layer 322 and the orthographic projection of the heat insulation layer 321 can completely overlap.

[0158] The technical solution of this application embodiment, by setting a thermal radiation emission layer, helps to reduce the impact of thermal runaway battery cell 21 on the thermal radiation of adjacent battery cells 21, reduces the rate of thermal diffusion, reduces the impact of thermal runaway battery cell 21 on adjacent battery cells 21, and helps to improve the reliability of battery device 1.

[0159] Please refer to Figure 10 In some embodiments, the thermal radiation reflective layer 322 includes one of a multilayer composite film.

[0160] In some embodiments, the thermal radiation reflective layer 322 may be formed as a multilayer composite film.

[0161] In some embodiments, the heat radiation reflective layer 322 may be formed by a composite film on the surface of aluminum.

[0162] In some embodiments, the heat radiation reflective layer 322 may be formed by a composite film on the surface of a ceramic.

[0163] The technical solution of this application embodiment has good thermal radiation resistance of multilayer composite film. By selecting one of the multilayer composite films to form thermal radiation reflective layer 322, it is beneficial to reduce the thermal radiation effect of thermal runaway battery cell 21 on adjacent battery cell 21, reduce the rate of thermal diffusion, reduce the impact of thermal runaway battery cell 21 on adjacent battery cell 21, and improve the reliability of battery device 1.

[0164] Please refer to Figure 10 In some embodiments, the thickness of the thermal radiation reflective layer 322 along the first direction X is d3, which satisfies: 0.2mm≤d3≤1mm.

[0165] In some embodiments, the thickness d3 of the thermal radiation reflective layer 322 satisfies the above conditions. d3 can be any value among 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1mm, or a value between any two values.

[0166] It should be noted that the above dimensions are the thickness before installation. After the heat radiation reflective layer 322 is installed between the battery cells 21, there may be extrusion deformation that causes changes in dimensions.

[0167] In the technical solution of this application embodiment, the thickness of the heat radiation reflective layer 322 satisfies the above conditions. When d3 ≥ 0.2 mm, the thickness of the heat radiation reflective layer 322 is relatively large, and the heat radiation resistance performance of the heat radiation reflective layer 322 is proportional to its thickness, which means that the heat radiation resistance performance of the heat radiation reflective layer 322 is good. When the battery cell 21 experiences thermal runaway, the heat radiation reflective layer 322 can reduce the rate of heat diffusion and reduce the impact of the thermally runaway battery cell 21 on adjacent battery cells 21, which is beneficial to improving the reliability of the battery device 1. When d3 ≤ 1 mm, the thickness of the heat radiation reflective layer 322 is relatively small, which can reduce the space occupation of the heat radiation reflective layer 322 in the first direction X, which is beneficial to improving the space utilization rate of the housing 10, thereby improving the energy density of the battery device 1.

[0168] Please refer to Figures 4 to 8 and refer to Figure 11 , Figure 11 This is a schematic diagram of a heat insulation body provided in some embodiments of this application. In some embodiments, the heat insulation body 32 further includes an insulating and flame-retardant layer 323, which is disposed between the heat insulation layer 321 and the heat radiation reflective layer 322 in a first direction X.

[0169] In some embodiments, in the first direction X, a heat radiation reflective layer 322 is located between two battery cells 21, and the heat radiation reflective layer 322 has a first surface and a second surface. There are two heat insulation layers 321 and two insulating and flame-retardant layers 323. One insulating and flame-retardant layer 323 is disposed on the first surface of the heat radiation reflective layer 322, and one heat insulation layer 321 is disposed on the surface of the insulating and flame-retardant layer 323 facing away from the first surface. The other insulating and flame-retardant layer 323 is disposed on the second surface of the heat radiation reflective layer 322, and the other heat insulation layer 321 is disposed on the surface of the insulating and flame-retardant layer 323 facing away from the second surface.

[0170] The technical solution of this application embodiment provides an insulating flame-retardant layer 323 between the heat insulation layer 321 and the heat radiation reflective layer 322. When the battery cell 21 catches fire, the insulating flame-retardant layer 323 can reduce the speed of flame spread, reduce the impact of the burning battery cell 21 on adjacent battery cells 21, and reduce the risk of short circuit in adjacent battery cells 21, which is beneficial to improving the reliability of the battery device 1.

[0171] Please refer to Figure 11 In some embodiments, the insulating flame-retardant layer 323 is made of ceramic fiber.

[0172] In some embodiments, the insulating and flame-retardant layer 323 may be formed of ceramic fibers.

[0173] In the technical solution of this application embodiment, ceramic fiber has good insulation and flame retardant properties. By selecting ceramic fiber to form an insulating and flame retardant layer 323, it is beneficial to reduce the impact of the ignited battery cell 21 on the adjacent battery cells 21, and at the same time reduce the risk of short circuit of the adjacent battery cells 21, which is beneficial to improve the reliability of the battery device 1.

[0174] Please refer to Figure 11 In some embodiments, the thickness of the insulating flame-retardant layer 323 along the first direction X is d4, satisfying: 0.1mm≤d4≤1mm.

[0175] In some embodiments, the thickness d4 of the insulating flame-retardant layer 323 satisfies the above conditions. d4 can be any value among 0.1mm, 0.2mm, 0.3mm, 0.4mm, 0.5mm, 0.6mm, 0.7mm, 0.8mm, 0.9mm, and 1mm, or a value between any two values.

[0176] It should be noted that the above dimensions are the thickness before installation. After the insulating and flame-retardant layer 323 is installed between the battery cells 21, there may be extrusion deformation that causes changes in dimensions.

[0177] In the technical solution of this application embodiment, the thickness of the insulating flame-retardant layer 323 satisfies the above conditions. When d4 ≥ 0.1 mm, the thickness of the insulating flame-retardant layer 323 is relatively large, and the insulation and flame-retardant properties of the insulating flame-retardant layer 323 are proportional to the thickness. This means that the insulation and flame-retardant properties of the insulating flame-retardant layer 323 are good, which helps to reduce the impact of the ignited battery cell 21 on adjacent battery cells 21, and at the same time reduces the risk of short circuits in adjacent battery cells 21, thus improving the reliability of the battery device 1. When d4 ≤ 1 mm, the thickness of the insulating flame-retardant layer 323 is relatively small, which can reduce the space occupied by the insulating flame-retardant layer 323 in the first direction X, which helps to improve the space utilization of the housing 10, thereby improving the energy density of the battery device 1.

[0178] Please refer to Figure 11 In some embodiments, the porosity of the insulating flame-retardant layer 323 is less than that of the heat insulation layer 321.

[0179] In some embodiments, the material of the insulating flame-retardant layer 323 may be the same as that of the heat insulation layer 321.

[0180] In some embodiments, both the insulating flame-retardant layer 323 and the heat insulation layer 321 can be formed of ceramic fibers. The fiber structure typically has pores, and the porosity of the insulating flame-retardant layer 323 is greater than that of the heat insulation layer 321.

[0181] The number of pores in the insulating flame-retardant layer 323 can be less than the number of pores in the heat insulation layer 321. The inner diameter of the pores in the insulating flame-retardant layer 323 can be less than the inner diameter of the pores in the heat insulation layer 321.

[0182] Alternatively, the number of pores in the insulating flame-retardant layer 323 can be greater than the number of pores in the heat insulation layer 321. The inner diameter of the pores in the insulating flame-retardant layer 323 can be smaller than the inner diameter of the pores in the heat insulation layer 321, and the total cross-sectional area of ​​all the pores in the insulating flame-retardant layer 323 can be smaller than the total cross-sectional area of ​​all the pores in the heat insulation layer 321.

[0183] The technical solution of this application embodiment sets the porosity of the insulating flame-retardant layer 323 to be less than that of the heat insulation layer 321, so that the insulating flame-retardant layer 323 has better flame-retardant performance. When the flame passes through the heat insulation layer 321, the insulating flame-retardant layer 323 can effectively prevent the spread of fire, reduce the impact of the burning battery cell 21 on the adjacent battery cell 21, and help improve the reliability of the battery device 1.

[0184] Please refer to Figure 1 This application provides an electrical device, including a battery device 1 as described in any of the above embodiments, wherein the battery device 1 is used to provide electrical energy to the electrical device.

[0185] Please refer to Figures 2 to 5 , Figure 7In some embodiments, the battery device 1 includes a housing 10, a battery cell assembly 20, and a heat insulation element 30. The battery cell assembly 20 is disposed within the housing 10 and includes a plurality of battery cells 21 arranged sequentially along the length of the housing 10.

[0186] In some embodiments, the heat insulation member 30 is disposed between two adjacent battery cells 21. The heat insulation member 30 includes a frame 31, a closure member 33 and a heat insulation body 32. The frame 31 and the closure member 33 are integrally thermoformed around the outer periphery of the heat insulation body 32 to form a closed first receiving cavity 34. The heat insulation body 32 is located inside the first receiving cavity 34.

[0187] In some embodiments, both the frame 31 and the closure 33 are made of polyurethane foam.

[0188] The technical solution of this application embodiment, by setting a heat insulation component 30 between two adjacent battery cells 21, can reduce the rate of heat diffusion when one of the battery cells 21 experiences thermal runaway, thereby reducing the impact of the thermally runaway battery cell 21 on adjacent battery cells 21 and improving the reliability of the battery device 1. By using polyurethane foam material to form the frame 31 and the closure 33, compared to using other materials (such as silicone rubber) to form the frame 31 through die-cutting, the frame 31 and the closure 33 are integrally thermoformed around the outer periphery of the heat insulation body 32. This improves material utilization, saves costs, enhances the convenience and efficiency of connecting the closure 33 and the frame 31, improves the consistency of the frame 31 formed in batches, facilitates automated processes, and improves processing efficiency.

[0189] 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, include: Box; A battery cell assembly is disposed within the housing, and the battery cell assembly includes a plurality of battery cells arranged sequentially along a first direction; A heat insulation component is disposed between two adjacent battery cells. The heat insulation component includes a frame, a closure, and a heat insulation body. The frame is hot-melt formed around the outer periphery of the heat insulation body, and the closure is integrally formed with the frame. Along the first direction, the closure closes the openings at both ends of the frame to form a closed first receiving cavity with the frame, and the heat insulation body is located inside the first receiving cavity. The frame is made of polyurethane foam, and the closure is made of polyurethane foam.

2. The battery device according to claim 1, characterized in that, The heat insulation body includes a heat insulation layer, which includes one of a phosphorus-nitrogen-based intumescent coating, paraffin wax, and a graphene composite.

3. The battery device according to claim 2, characterized in that, Along the first direction, the thickness of the insulation layer is d2, which satisfies: 0.3mm≤d2≤5mm.

4. The battery device according to claim 2, characterized in that, The heat insulation body also includes a heat radiation reflective layer, which is disposed on both sides of the heat radiation reflective layer in the first direction.

5. The battery device according to claim 4, characterized in that, The thermal radiation reflective layer comprises a multilayer composite film.

6. The battery device according to claim 4, characterized in that, Along the first direction, the thickness of the thermal radiation reflective layer is d3, which satisfies: 0.2mm≤d3≤1mm.

7. The battery device according to claim 4, characterized in that, The heat insulation body also includes an insulating and flame-retardant layer, which is disposed between the heat insulation layer and the heat radiation reflective layer in the first direction.

8. The battery device according to claim 7, characterized in that, The insulating and flame-retardant layer is made of ceramic fiber.

9. The battery device according to claim 7, characterized in that, Along the first direction, the thickness of the insulating flame-retardant layer is d4, which satisfies: 0.1mm≤d4≤1mm.

10. The battery device according to claim 7, characterized in that, The porosity of the insulating flame-retardant layer is less than that of the heat insulation layer.

11. An electrical appliance, characterized in that, The battery device includes any one of claims 1-10, wherein the battery device is used to provide electrical energy to the electrical device.

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