Thermal insulation member, battery device, and electric device
By combining low-foaming and high-foaming structures, the problem of traditional heat insulation components being heavy and having poor heat insulation effect is solved, achieving good heat insulation performance and adaptability to battery cell expansion and deformation, while reducing weight.
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- CONTEMPORARY AMPEREX TECHNOLOGY CO LTD
- Filing Date
- 2025-01-27
- Publication Date
- 2026-07-30
AI Technical Summary
Traditional heat insulation components are heavy and have poor heat insulation effect, and cannot effectively adapt to the expansion and deformation of battery cells.
The design employs a combination of low-foaming and high-foaming structures. The high-foaming structure has a lower density than the low-foaming structure, and the high-foaming structure is easily deformable to provide release space, while the low-foaming structure restricts expansion and deformation.
It improves the heat insulation performance of the heat insulation component and its ability to adapt to the expansion and deformation of battery cells, reduces heat spread, and lowers weight.
Smart Images
Figure CN2025075420_30072026_PF_FP_ABST
Abstract
Description
Thermal insulation components, battery devices and electrical equipment Technical Field
[0001] This application relates to the field of battery technology, and more specifically, to a heat insulation component, a battery device, and an electrical device. Background Technology
[0002] With the popularization and promotion of new energy vehicles, their charging and discharging performance and range have increasingly attracted people's attention and importance. As the power energy source for new energy vehicles, power batteries are widely used.
[0003] A battery consists of individual cells. During the charging and discharging process of a single cell, if the battery experiences thermal runaway, it will generate a large amount of heat and the temperature will rise rapidly. In order to delay or prevent the spread of heat generated by the electrode components, heat insulation components are usually placed between two adjacent cells. However, traditional heat insulation components mostly use hard rubber pads, resulting in poor heat insulation effect and heavy weight, and they do not have a good ability to adapt to the expansion and deformation of the cell. Summary of the Invention
[0004] In view of this, this application discloses a heat insulation component, a battery device, and an electrical appliance.
[0005] A battery device includes at least two battery cells and a heat insulation component. The at least two battery cells are arranged side-by-side along a first direction, and the heat insulation component is disposed on at least one side of at least one battery cell in the first direction. The heat insulation component has a low-foaming structure and a high-foaming structure, with the density of the high-foaming structure being lower than that of the low-foaming structure. In this battery device, by having the heat insulation component with both low-foaming and high-foaming structures, the high-foaming structure, due to its lower density, is more prone to deformation. While the low-foaming structure restricts the expansion and deformation of the battery cells, the high-foaming structure provides space for the expansion of the battery cells, thus enabling the heat insulation component to possess good heat insulation performance and the ability to adapt to the expansion and deformation of the battery cells.
[0006] In some embodiments, the heat insulation component includes a plate with a first surface and a second surface disposed opposite each other along a first direction. The first surface is adjacent to the battery cell, and a high-foaming structure and a low-foaming structure are formed between the first surface and the second surface. This allows the heat insulation component to restrict the expansion and deformation of the battery cell in the first direction and provide space for the expansion of the battery cell in the first direction.
[0007] In some embodiments, the plate further includes a third, fourth, fifth, and sixth surface connecting the first and second surfaces, wherein at least one of the first, second, third, fourth, fifth, and sixth surfaces forms a low-foaming structure. This allows the thermal insulation component to restrict the expansion and deformation of the battery cells in different directions, while also providing good thermal insulation performance and improving the battery cells' resistance to thermal runaway.
[0008] In some embodiments, the third, fourth, fifth, and sixth surfaces are all low-foaming structures. Thus, the third, fourth, fifth, and sixth surfaces form a low-foaming frame structure open at both ends, enabling the insulation component to possess excellent thermal insulation performance.
[0009] In some embodiments, the thickness of the low-foaming structure of the third surface ranges from 0.1 mm to 2 mm along the direction perpendicular to the third surface. This limits the expansion and deformation of the battery cells and prevents the heat insulation component from occupying excessive space.
[0010] In some embodiments, both the first and second surfaces are low-foaming structures. Thus, the first, second, third, fourth, fifth, and sixth surfaces form a closed, low-foaming frame structure, which further improves the thermal insulation performance of the insulation component and further restricts the expansion and deformation of individual battery cells.
[0011] In some embodiments, the thickness of the low-foaming structure of the first surface ranges from 0.1 mm to 2 mm along a direction perpendicular to the first surface. This limits the expansion and deformation of the battery cells and prevents the heat insulation component from occupying excessive space.
[0012] In some embodiments, the heat insulation component is cross-sectioned along a direction perpendicular to the first surface. A high-density foaming structure between the first and second surfaces is located in the central region of the heat insulation component, and a low-density foaming structure surrounds the outer periphery of the high-density foaming structure. Thus, the low-density foaming structure surrounds the outer periphery of the high-density foaming structure, allowing the low-density foaming structure to restrict the expansion and deformation of the battery cells while the high-density foaming structure provides space for the expansion of the battery cells.
[0013] In some embodiments, the size of the low-foaming structure between the first and second surfaces along the first direction is 1 mm to 5 mm. Thus, by limiting the size of the low-foaming structure in the first direction, the deformation of the battery cell can be restricted, and the thickness of the heat insulation component will not be excessive.
[0014] In some embodiments, the size of the low-foaming structure between the first and second surfaces is 1 mm to 10 mm along the second direction, which is the height direction of the heat insulation component. Thus, by limiting the size of the low-foaming structure in the second direction, the deformation of the battery cells can be restricted, and the volume of the heat insulation component will not occupy excessive space.
[0015] In some embodiments, the heat insulation component is cross-sectioned along a direction perpendicular to the first surface, and the cross-section of the high-foaming structure between the first and second surfaces is elliptical. Thus, the high-foaming structure provides space for the expansion of individual battery cells without occupying too much space in the heat insulation component, allowing sufficient space for the installation of a low-foaming structure.
[0016] In some embodiments, the two apexes of the ellipse are located near the third and fourth surfaces, respectively. This increases the distribution area of the high-density foam structure and improves the space utilization of the insulation component.
[0017] In some embodiments, the first surface includes a first position, the second surface includes a second position, and the first and second positions respectively form low-foaming structures. Thus, the heat insulation component has sufficient support in the first direction, enabling it to limit the expansion and deformation of the battery cells in that direction.
[0018] In some embodiments, the first position and the second position are two positions disposed opposite each other along a first direction. This allows the heat insulation element to better limit the expansion and deformation of the battery cells in the first direction.
[0019] In some embodiments, the low-foaming structure formed at the first location forms a circular region on the first surface, the circular region being made of foamed material. This allows the low-foaming structure to effectively limit the deformation of the battery cell while providing a small amount of space to allow for the expansion of the battery cell.
[0020] In some embodiments, the heat insulation member is cross-sectioned at a first location along a direction perpendicular to the first surface, and the cross-section of the low-foaming structure at the first location is semi-circular. This allows the low-foaming structure to effectively limit the deformation of the battery cells while providing space for the expansion of the battery cells.
[0021] In some embodiments, a cross-section of the heat insulation component is made at a first position along a direction perpendicular to the first surface, and the low-foaming structure at the first position is connected to a low-foaming structure at a second position. This further increases the distribution area of the low-foaming structure, allowing it to effectively limit the expansion and deformation of the battery cells.
[0022] In some embodiments, the number of first positions is at least two, and the first positions are spaced apart along the height direction of the heat insulation member, with each first position having at least one low-foaming structure. This allows for better mechanical strength of the heat insulation member, limiting the deformation of the battery cells while providing space for the expansion of the battery cells.
[0023] In some embodiments, the number of second positions is at least two, and the second positions are spaced apart along the height direction of the heat insulation member, with each second position having at least one low-foaming structure. This improves the mechanical strength of the heat insulation member, further restricting the deformation of the battery cells while providing space for the expansion of the battery cells.
[0024] In some embodiments, the heat insulation component includes a plate and at least two hollow portions, each hollow portion being incorporated into the plate. The plate has both low-foaming and high-foaming structures. This enables the heat insulation component to possess excellent heat insulation performance and the ability to accommodate the expansion and deformation of individual battery cells.
[0025] In some embodiments, each hollow portion is constructed as a hollow glass bead structure. This allows for a reduction in the weight of the insulation component while maintaining good thermal insulation performance.
[0026] In some embodiments, the outer diameter of each hollow portion ranges from 2 μm to 130 μm. By limiting the outer diameter range of each hollow portion, the thermal insulation component can achieve good thermal insulation performance while reducing weight. In some embodiments, the density ratio of the low-foaming structure to the high-foaming structure is 1.1 to 5. By limiting the density ratio range of the low-foaming structure to the high-foaming structure, both the low-foaming and high-foaming structures can meet the requirements for thermal insulation and accommodate the expansion and deformation of individual battery cells.
[0027] In some embodiments, the density of the low-foaming structure ranges from 0.5 g / cm³ to 1.3 g / cm³. Thus, by limiting the density of the low-foaming structure, it can provide some support for the battery cells.
[0028] In some embodiments, the density of the highly foamed structure ranges from 0.2 g / cm³ to 0.9 g / cm³. Thus, by limiting the density of the highly foamed structure, it can deform, providing space for the expansion of the battery cells.
[0029] In some embodiments, the battery device further includes a housing beam, with a heat insulation element disposed between the housing beam and the individual battery cells. This enables better heat insulation between the housing beam and the individual battery cells, reducing heat diffusion from the battery cells to the housing beam.
[0030] A heat insulation component is used in the aforementioned battery device. The heat insulation component includes a plate disposed on at least one side of at least one battery cell in a first direction. The plate is made of a foamed material and has a low-foaming structure and a high-foaming structure, wherein the density of the high-foaming structure is lower than the density of the low-foaming structure. Because the density of the high-foaming structure is lower than that of the low-foaming structure, the high-foaming structure is more prone to deformation. While the low-foaming structure restricts the expansion and deformation of the battery cell, the high-foaming structure provides space for the expansion of the battery cell, thus enabling the heat insulation component to possess good heat insulation performance and the ability to adapt to the expansion and deformation of the battery cell.
[0031] An electrical device includes the aforementioned battery assembly or the aforementioned heat insulation component. The aforementioned electrical device, by having the heat insulation component possess both a low-foaming structure and a high-foaming structure, allows for deformation more easily due to the lower density of the high-foaming structure compared to the low-foaming structure. While the low-foaming structure restricts the expansion and deformation of individual battery cells, the high-foaming structure provides space for the expansion of the battery cells, thereby enabling the heat insulation component to possess good heat insulation performance and the ability to adapt to the expansion and deformation of individual battery cells. Attached Figure Description
[0032] Figure 1 is a schematic diagram of electrical equipment in some embodiments of this application.
[0033] Figure 2 is a schematic diagram of the battery device in some embodiments of this application.
[0034] Figure 3 is an isometric view of the thermal insulation component in some embodiments of this application.
[0035] Figure 4 is a schematic diagram of the heat insulation element in some embodiments of this application.
[0036] Figure 5 is a cross-sectional view of the thermal insulation component shown in Figure 4 from the AA side.
[0037] Figure 6 is a schematic diagram of the heat insulation element in some other embodiments of this application.
[0038] Figure 7 is a cross-sectional view of the thermal insulation component shown in Figure 6 along plane AA.
[0039] Figure 8 is a schematic diagram of the heat insulation element in some other embodiments of this application.
[0040] Figure 9 is a cross-sectional view of the thermal insulation component shown in Figure 8 from plane AA.
[0041] Figure label:
[0042] 10. Vehicle; 11. Controller; 12. Motor; 20. Battery unit; 21. Box beam; 100. Battery cell; 200. Thermal insulation component; 201. Low-foaming structure; 202. High-foaming structure; 210. First surface; 220. Second surface; 230. Third surface; 240. Fourth surface; 250. Fifth surface; 260. Sixth surface. Detailed Implementation
[0043] To make the above-mentioned objectives, features, and advantages of this application more apparent and understandable, the specific embodiments of this application are described in detail below with reference to the accompanying drawings. Many specific details are set forth in the following description to provide a thorough understanding of this application. However, this application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar modifications without departing from the spirit of this application. Therefore, this application is not limited to the specific embodiments disclosed below.
[0044] In the description of this application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0045] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this application, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0046] In this application, unless otherwise expressly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0047] In this application, unless otherwise expressly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.
[0048] It should be noted that when an element is referred to as being "fixed to" or "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is considered to be "connected to" another element, it can be directly connected to the other element or there may be an intervening element. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only possible implementation.
[0049] With the popularization and promotion of new energy vehicles, their charging and discharging performance and range have increasingly attracted people's attention and importance. As the power source for new energy vehicles, batteries are widely used.
[0050] A battery consists of individual cells. During the charging and discharging process of a single cell, if the battery experiences thermal runaway, it will generate a large amount of heat and the temperature will rise rapidly. In order to delay or prevent the spread of heat generated by the electrode components, heat insulation components are usually placed between two adjacent cells. However, traditional heat insulation components mostly use hard rubber pads, resulting in poor heat insulation effect and heavy weight, and they do not have a good ability to adapt to the expansion and deformation of the cell.
[0051] Based on the above considerations and after in-depth research, this application designs a heat insulation component, a battery device, and an electrical device. In the battery device, the heat insulation component has a low-foaming structure and a high-foaming structure. Since the density of the high-foaming structure is lower than that of the low-foaming structure, the high-foaming structure is more prone to deformation than the low-foaming structure. While the low-foaming structure restricts the expansion and deformation of the battery cell, the high-foaming structure can provide release space for the expansion of the battery cell, so that the heat insulation component has good heat insulation performance and the ability to adapt to the expansion and deformation of the battery cell.
[0052] This application provides an electrical device that uses a battery as a power source. The electrical device can be, but is not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools. 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.
[0053] For ease of explanation, the following embodiments will be described using a vehicle 10 as an example of an electrical device according to an embodiment of this application.
[0054] Referring to Figure 1, vehicle 10 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 20 is installed inside vehicle 10, and the battery device 20 can be located at the bottom, front, or rear of vehicle 10. The battery device 20 can be used to power vehicle 10; for example, the battery device 20 can serve as the operating power source for vehicle 10. Vehicle 10 may also include a controller 11 and a motor 12. The controller 11 is used to control the battery device 20 to supply power to the motor 12, for example, to meet the power needs of vehicle 10 during starting, navigation, and driving.
[0055] In some embodiments of this application, the battery device 20 can not only serve as the operating power source for the vehicle 10, but also as the driving power source for the vehicle 10, replacing or partially replacing fuel or natural gas to provide driving force for the vehicle 10.
[0056] Please refer to Figures 2 to 4. In one embodiment, the battery device 20 includes at least two battery cells 100 and a heat insulation member 200. The at least two battery cells 100 are arranged side by side along a first direction, and the heat insulation member 200 is disposed on at least one side of at least one battery cell 100 in the first direction. The heat insulation member 200 has a low foaming structure 201 and a high foaming structure 202, and the density of the high foaming structure 202 is less than the density of the low foaming structure 201.
[0057] It should be noted that the first direction is the X direction shown in Figure 4, which is the thickness direction of the heat insulation component 200.
[0058] In the embodiments of this application, there can be multiple battery cells 100, which can be connected in series, parallel, or in a mixed manner. A mixed connection means that multiple battery cells 100 are connected in both series and parallel configurations. Multiple battery cells 100 can be directly connected in series, parallel, or in a mixed manner, and then the entire assembly of the multiple battery cells 100 is placed on one side of the housing. Alternatively, multiple battery cells 100 can first be connected in series, parallel, or in a mixed manner to form a battery module, and then multiple battery modules can be connected in series, parallel, or in a mixed manner to form a whole. Each battery cell 100 can be a secondary battery or a primary battery; it can also be a lithium-sulfur battery, a sodium-ion battery, or a magnesium-ion battery, but is not limited to these. The battery cell 100 can be cylindrical, flat, cuboid, or other shapes.
[0059] In the embodiments of this application, the heat insulation component 200 is disposed on at least one side of the battery cell 100 in the first direction. This can be understood as the heat insulation component 200 being located between two adjacent battery cells 100, or between the battery cell 100 and the end cap of the battery casing. The heat insulation component 200 is a component used to reduce heat transfer and heat diffusion, thereby enhancing the heat insulation performance of the battery cell 100 and improving its resistance to thermal runaway. The heat insulation component 200 may be, but is not limited to, a flat body, a cuboid, or other shapes; no specific limitation is made here.
[0060] In the embodiments of this application, the high foaming structure 202 refers to the region with a high foaming rate, that is, the material is foamed to form many bubbles inside. The foaming method can be chemical foaming or physical foaming. Chemical foaming is achieved by adding a foaming agent to the material and using a chemical reaction to generate gas; while physical foaming is achieved by changing physical conditions such as temperature and pressure to form bubbles inside the material.
[0061] In the embodiments of this application, the low-foaming structure 201 is a region with low foaming rate or no foaming, that is, a few bubbles are formed inside the material or no bubbles are formed.
[0062] The aforementioned battery device 20, by having the heat insulation component 200 have a low-foaming structure 201 and a high-foaming structure 202, since the density of the high-foaming structure 202 is lower than that of the low-foaming structure 201, the high-foaming structure 202 is more prone to deformation than the low-foaming structure 201. While the low-foaming structure 201 restricts the expansion and deformation of the battery cell 100, the high-foaming structure 202 can provide release space for the expansion of the battery cell 100, so that the heat insulation component 200 has good heat insulation performance and the ability to adapt to the expansion and deformation of the battery cell 100.
[0063] According to some embodiments of this application, please refer to FIG3. The heat insulation component 200 includes a plate body, the plate body including a first surface 210 and a second surface 220 disposed opposite to each other along a first direction, the first surface 210 being adjacent to the battery cell 100, and a high foaming structure 202 and a low foaming structure 201 being formed between the first surface 210 and the second surface 220.
[0064] It is understood that the first surface 210 and the second surface 220 are two sides of the heat insulation member 200 that are disposed opposite to each other along the first direction. For example, when the heat insulation member 200 is located between two adjacent battery cells 100, the first surface 210 is the left side adjacent to one of the battery cells 100, and the second surface 220 is the right side adjacent to the other battery cell 100; as another example, when it is located between a battery cell 100 and the end cap of the battery case, the first surface 210 is the left side adjacent to the battery cell 100, and the second surface is the right side adjacent to the end cap of the other battery case.
[0065] In the embodiments of this application, a high-foaming structure 202 and a low-foaming structure 201 are formed between the first surface 210 and the second surface 220. The number of high-foaming structures 202 and low-foaming structures 201 is not limited to one, and multiple high-foaming structures 202 and low-foaming structures 201 can be arranged in various ways. For example, the low-foaming structure 201 surrounds the outer periphery of the high-foaming structure 202, or the high-foaming structure 202 and low-foaming structure 201 are arranged in a matrix. Here, the arrangement of high-foaming structures 202 and low-foaming structures 201 is not specifically limited.
[0066] In the embodiments of this application, the second surface 220 and the first surface 210 can both be planar structures, or both be arc-shaped structures, or one is a planar structure and the other is an arc-shaped structure.
[0067] With the above configuration, the heat insulation member 200 can restrict the expansion and deformation of the battery cell 100 in the first direction, and provide release space for the expansion of the battery cell 100 in the first direction.
[0068] According to some embodiments of this application, referring to FIG3, the plate further includes a third surface 230, a fourth surface 240, a fifth surface 250 and a sixth surface 260 connecting the first surface 210 and the second surface 220, and at least one of the first surface 210, the second surface 220, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 forms a low-foaming structure 201.
[0069] It should be noted that at least one of the first surface 210, the second surface 220, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 forms a low-foaming structure 201. The low-foaming structure 201 may be formed in one of the above surfaces or in at least two of the above surfaces.
[0070] In the embodiments of this application, the first surface 210, the second surface 220, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are located on different sides of the heat insulation member 200, that is, the six surfaces are not coplanar, so that the heat insulation member 200 as a whole is constructed as a hexahedron, for example, the heat insulation member 200 is constructed as a cuboid plate or a cube plate structure.
[0071] In the embodiments of this application, the first surface 210, the second surface 220, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are planar structures and / or curved structures.
[0072] Through the above-mentioned configuration, the heat insulation component 200 can restrict the expansion and deformation of the battery cell 100 in different directions, and has good heat insulation performance, thereby improving the thermal runaway resistance of the battery cell 100.
[0073] According to some embodiments of this application, please refer to FIG3, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are all low foaming structures 201.
[0074] This can be understood as the entire surface of the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 being a low-foaming structure 201, that is, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are arranged to form a low-foaming frame structure with openings at both ends.
[0075] In the embodiments of this application, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are all low foaming structures, and the foaming rates of each surface may be equal or unequal.
[0076] With the above configuration, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are arranged to form a low-foaming frame structure with open ends, which enables the thermal insulation component 200 to have good thermal insulation performance.
[0077] According to some embodiments of this application, referring to FIG3, the thickness of the low-foaming structure 201 of the third surface 230 in the direction perpendicular to the third surface 230 ranges from 0.1 mm to 2 mm.
[0078] Understandably, the thickness design of the low-foaming structure 201 of the third surface 230 needs to be designed to limit the expansion and deformation of the battery cell 100 without taking up too much space.
[0079] In the embodiments of this application, the thicknesses of the low-foaming structures 201 of the third surface 230, the fourth surface 240, the fifth surface 250, and the sixth surface 260 may be equal or unequal. Preferably, the thicknesses of the low-foaming structures 201 of the third surface 230, the fourth surface 240, the fifth surface 250, and the sixth surface 260 are equal, which is beneficial for uniform heat dissipation and uniform restriction of expansion deformation.
[0080] The above settings can limit the expansion and deformation of the battery cell 100 and prevent the heat insulation component 200 from occupying too much space.
[0081] According to some embodiments of this application, please refer to FIG3, the first surface 210 and the second surface 220 are both low foaming structures 201.
[0082] This can be understood as the entire surface of the first surface 210 and the second surface 220 being a low-foaming structure 201, that is, the first surface 210, the second surface 220, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are arranged to form a closed low-foaming frame structure.
[0083] In the embodiments of this application, the first surface 210 and the second surface 220 are both low-foaming structures, and the foaming rates of each surface may be equal or unequal.
[0084] With the above configuration, the first surface 210, the second surface 220, the third surface 230, the fourth surface 240, the fifth surface 250 and the sixth surface 260 are arranged to form a closed low-foaming frame structure, which can further improve the heat insulation performance of the heat insulation component 200 and further limit the expansion and deformation of the battery cell 100.
[0085] According to some embodiments of this application, please refer to FIG3, the thickness of the low-foaming structure 201 of the first surface 210 in the direction perpendicular to the first surface 210 ranges from 0.1 mm to 2 mm.
[0086] Understandably, the thickness design of the low-foaming structure 201 of the first surface 210 needs to be designed to limit the expansion and deformation of the battery cell 100 without taking up too much space.
[0087] In the embodiments of this application, the thicknesses of the low-foaming structures 201 on the first surface 210 and the second surface 220 may be equal or unequal. Preferably, the thicknesses of the low-foaming structures 201 on the first surface 210 and the second surface 220 are equal, which is beneficial for uniform heat dissipation and uniform restriction of expansion deformation.
[0088] The above settings can limit the expansion and deformation of the battery cell 100 and prevent the heat insulation component 200 from occupying too much space.
[0089] According to some embodiments of this application, please refer to Figures 4 and 5. A cross section is taken of the heat insulation member 200 in a direction perpendicular to the first surface 210. The high-foaming structure 202 between the first surface 210 and the second surface 220 is located in the middle region of the heat insulation member 200, and the low-foaming structure 201 surrounds the outer periphery of the high-foaming structure 202.
[0090] It should be noted that when the thermal insulation component 200 is cross-sectioned along the direction perpendicular to the YZ plane, the resulting cross-section is parallel to the XY plane.
[0091] In the embodiments of this application, the low-foaming structure 201 is disposed around the outer periphery of the high-foaming structure 202, and the low-foaming structure 201 is symmetrically distributed in the first direction to give the heat insulation member 200 better support performance.
[0092] With the above configuration, the low-foaming structure 201 surrounds the outer periphery of the high-foaming structure 202. While the low-foaming structure 201 restricts the expansion and deformation of the battery cell 100, the high-foaming structure 202 can provide space for the expansion of the battery cell 100.
[0093] According to some embodiments of this application, please refer to Figures 4 and 5. Along the first direction, the size of the low-foaming structure 201 between the first surface 210 and the second surface 220 is 1 mm to 5 mm.
[0094] It should be noted that the dimension of the low-foaming structure 201 in the first direction is the width W of the low-foaming structure 201.
[0095] In the embodiments of this application, the width design of the low foaming structure 201 needs to be considered to limit the deformation of the battery cell 100, and the width of the low foaming structure 201 will not make the heat insulation component 200 too thick.
[0096] By limiting the dimensions of the low-foaming structure 201 in the first direction, the low-foaming structure 201 can restrict the deformation of the battery cell 100, and the thickness of the heat insulation component 200 will not be too thick.
[0097] According to some embodiments of this application, please refer to Figures 4 and 5. Along the second direction, the size of the low-foaming structure 201 between the first surface 210 and the second surface 220 is 1 mm to 10 mm. The second direction is the height direction of the heat insulation member 200.
[0098] It should be noted that the second direction is the Y direction shown in Figure 4, which is also the height direction H of the thermal insulation component 200. The dimension of the low-foaming structure 201 in the second direction is also the height of the low-foaming structure 201.
[0099] In the embodiments of this application, the height design of the low foaming structure 201 needs to be considered to limit the deformation of the battery, and the height of the low foaming structure 201 will not cause the heat insulation component 200 to occupy too much space.
[0100] By limiting the size of the low-foaming structure 201 in the second direction, the low-foaming structure 201 can restrict the deformation of the battery cell 100, and the heat insulation component 200 will not occupy too much space.
[0101] According to some embodiments of this application, please refer to Figures 4 and 5. A cross-section of the heat insulation member 200 is made along the direction perpendicular to the first surface 210. The cross-section of the high-foaming structure 202 between the first surface 210 and the second surface 220 is elliptical.
[0102] It should be noted that the cross-section of the high-foaming structure 202 between the first surface 210 and the second surface 220 is pointed at both ends and wide in the middle.
[0103] In the embodiments of this application, the high foaming structure 202 is formed by physical foaming, that is, by injecting low volatile liquid or gas into the material, dissolving it into the material matrix under heating conditions, and then rapidly releasing it during the cooling process to form a large number of micro bubbles. The elliptical cross-section of the high foaming structure 202 is a shape that is naturally formed by the process mold during the cooling process.
[0104] With the above configuration, the high-foaming structure 202 can provide space for the expansion of the battery cell 100, while not occupying too much space in the heat insulation component 200, and can reserve enough space for the low-foaming structure 201.
[0105] According to some embodiments of this application, please refer to Figures 4 and 5, the two tips of the ellipse are close to the third surface 230 and the fourth surface 240, respectively.
[0106] It is understandable that the major axis of the ellipse extends along the Y direction as shown in Figure 5, and the minor axis extends along the X direction as shown in Figure 5.
[0107] The above settings can increase the distribution area of the high-foaming structure 202 and improve the space utilization of the insulation component 200.
[0108] According to some embodiments of this application, please refer to Figures 6 to 9. The first surface 210 includes a first position, and the second surface 220 includes a second position. The first position and the second position respectively form a low-foaming structure 201.
[0109] In the embodiments of this application, the first position can be flexibly set according to actual needs, such as being located in the middle, edge or other areas of the first surface 210; the second position can be flexibly set according to actual needs, such as being located in the middle, edge or other areas of the second surface 220.
[0110] With the above configuration, the heat insulation component 200 has sufficient support in the first direction, and the heat insulation component 200 can limit the expansion and deformation of the battery cell 100 in the first direction.
[0111] According to some embodiments of this application, please refer to Figures 6 and 7. The first position and the second position are two positions that are arranged opposite to each other along the first direction.
[0112] It should be noted that the first position and the second position are two positions that are arranged opposite to each other along the first direction. That is, the first position and the second position are located on opposite sides of the heat insulation member 200 in the first direction, and the first position and the second position are at the same height in the Y direction as shown in Figure 6.
[0113] In the embodiments of this application, the foaming rates of the low-foaming structure 201 at the first position and the low-foaming structure 201 at the second position may be equal or unequal.
[0114] The above-mentioned configuration allows the heat insulation component 200 to better restrict the expansion and deformation of the battery cell 100 in the first direction.
[0115] According to some embodiments of this application, please refer to Figures 6 and 7. The low-foaming structure 201 formed at the first position forms a circular region on the first surface 210, and the circular region is made of foaming material.
[0116] It can be understood here that the low-foaming structure 201 formed at the first position is made of foamed material, that is, the low-foaming structure 201 formed at the first position is not unfoamed, but has a low foaming rate.
[0117] In the embodiments of this application, the low-foaming structure 201 formed at the second position also forms a circular region on the second surface 210, and the circular region is made of foamed material. The circular regions at the first and second positions may have the same or different sizes.
[0118] Through the above settings, the low-foaming structure 201 effectively restricts the deformation of the battery cell 100, while providing a small amount of space for the expansion of the battery cell 100.
[0119] According to some embodiments of this application, please refer to Figures 6 and 7. A cross-section of the heat insulation member 200 is made at a first position along a direction perpendicular to the first surface 210. The cross-section of the low-foaming structure 201 at the first position is semi-circular.
[0120] It should be noted that the cross-section of the low-foaming structure 201 at the first position is semi-circular, and the semi-circular opening faces outward.
[0121] In the embodiments of this application, the low-foaming structure 201 at the first position is formed by physical foaming, that is, by injecting low-volatility liquid or gas into the material, dissolving it into the material matrix under heating conditions, and then rapidly releasing it during the cooling process to form a large number of micro bubbles. The semi-circular cross-section of the low-foaming structure 201 at the first position is a shape naturally formed by the process mold during the cooling process.
[0122] In the embodiments of this application, the heat insulation member 200 is cross-sectioned at the second position along a direction perpendicular to the second surface 220, and the cross-section of the low foaming structure 201 at the second position is also semi-circular.
[0123] Through the above settings, the low-foaming structure 201 effectively restricts the deformation of the battery cell 100, while providing space for the expansion of the battery cell 100.
[0124] According to some embodiments of this application, please refer to Figures 6 and 7. A cross section is made of the heat insulation member 200 at a first position along a direction perpendicular to the first surface 210. The low foaming structure 201 at the first position is connected to the low foaming structure 201 at the second position.
[0125] In the embodiments of this application, the low-foaming structure 201 at the first position is connected to the low-foaming structure 201 at the second position. This can be understood as the low-foaming structure 201 at the first position and the low-foaming structure 201 at the second position at least partially overlapping or connecting. For example, the cross-sections of the low-foaming structure 201 at the first position and the low-foaming structure 201 at the second position are both semi-circular, and the outlines of the semi-circular structures at the first and second positions at least partially overlap or connect.
[0126] By adopting the above settings, the distribution area of the low foaming structure 201 is further increased, so that the low foaming structure 201 can effectively limit the expansion and deformation of the battery cell 100.
[0127] According to some embodiments of this application, please refer to Figures 8 and 9. The number of first positions is at least two, and each first position is distributed at intervals along the height direction of the heat insulation member 200. Each first position is formed with at least one low foaming structure 201.
[0128] In the embodiments of this application, at least one low-foaming structure 201 is formed at any first position, all first positions are located on the same side of the heat insulation member 200, and each first position is distributed at intervals along the height direction of the heat insulation member 200, and the distance between two adjacent first positions may be equal or unequal.
[0129] The above-mentioned design improves the mechanical strength of the heat insulation component 200, restricts the deformation of the battery cell 100, and provides space for the expansion of the battery cell 100.
[0130] According to some embodiments of this application, please refer to Figures 8 and 9. The number of second positions is at least two, and each second position is spaced apart along the height direction of the heat insulation member 200. Each second position has at least one low foaming structure 201.
[0131] In the embodiments of this application, at least one low-foaming structure 201 is formed at any second position, all second positions are located on the same side of the heat insulation member 200, and each second position is distributed at intervals along the height direction of the heat insulation member 200, and the distance between two adjacent second positions may be equal or unequal.
[0132] The above-mentioned design improves the mechanical strength of the heat insulation component 200, further restricts the deformation of the battery cell 100, and provides space for the expansion of the battery cell 100.
[0133] According to some embodiments of this application, please refer to FIG5, the heat insulation component 200 further includes at least two hollow portions, each hollow portion being incorporated into the plate body, and the plate body having a low foaming structure 201 and a high foaming structure 202.
[0134] It should be noted that by incorporating the hollow portions into the plate, the weight of the heat insulation component 200 can be reduced, and the hollow portions can further insulate the heat, thereby further reducing the heat transfer and heat diffusion of the battery cell 100.
[0135] In the embodiments of this application, the thermal conductivity of the heat insulation component 200 is 0.1 W / m·K. Thermal conductivity is a physical quantity that measures the heat conduction capacity of a material. It represents the amount of heat transferred per unit time through an area of 1 square meter when the temperature difference between the two surfaces of a 1-meter-thick material is 1 degree under stable heat transfer conditions. It reflects the ability of the heat insulation component 200 to resist heat transfer.
[0136] In the embodiments of this application, the plate is constructed as a plastic structure, and the hollow part can be made of a material other than plastic.
[0137] Through the above settings, the heat insulation component 200 has good heat insulation performance and the ability to adapt to the expansion and deformation of the battery cell 100.
[0138] According to some embodiments of this application, please refer to FIG5, each hollow portion is constructed as a hollow glass bead structure.
[0139] It is understandable that each hollow part is constructed as a hollow glass bead structure, which is also known as a hollow glass sphere. The shape and size of each hollow glass sphere can be the same or different.
[0140] The above-mentioned design allows for a reduction in the weight of the insulation component 200 while maintaining good insulation performance.
[0141] According to some embodiments of this application, please refer to FIG5, the outer diameter of each hollow part ranges from 2μm to 130μm.
[0142] It should be noted that the outer diameter of the hollow part reflects the volume occupied by the hollow portion inside, thus affecting the thermal insulation performance of the thermal insulation component 200.
[0143] By limiting the outer diameter range of each hollow part through the above settings, the heat insulation component 200 can have better heat insulation performance and reduced weight.
[0144] According to some embodiments of this application, referring to FIG4, the density ratio of the low-foaming structure 201 to the density of the high-foaming structure 202 is 1.1 to 5.
[0145] Understandably, the density of the low-density structure 201 and the density of the high-density structure 202 will affect their ability to resist bending deformation. For example, the larger the ratio of the density of the low-density structure 201 to the density of the high-density structure 202, the greater the difference in density between the two structures, and the more easily the low-density structure 201 will deform compared to the high-density structure 202.
[0146] By setting the density of the low-foaming structure 201 to the density of the high-foaming structure 202 within a certain range, the low-foaming structure 201 and the high-foaming structure 202 can meet the requirements for heat insulation and adapting to the expansion and deformation of the battery cell 100.
[0147] According to some embodiments of this application, please refer to Figure 4, the density of the low-foaming structure 201 ranges from 0.5 g / cm3 to 1.3 g / cm3.
[0148] In the embodiments of this application, the density design of the low-foaming structure 201 needs to consider limiting the expansion and deformation of the battery cell 100.
[0149] By setting the density of the low-foaming structure 201 as described above, the low-foaming structure 201 can provide a certain degree of support for the battery cell 100.
[0150] According to some embodiments of this application, please refer to Figure 4, the density of the high-foaming structure 202 ranges from 0.2 g / cm3 to 0.9 g / cm3.
[0151] In the embodiments of this application, the density design of the high-foaming structure 202 needs to consider providing space for the expansion of the battery cell 100.
[0152] By setting the density of the high-foaming structure 202 as described above, the high-foaming structure 202 can be deformed, providing space for the expansion of the battery cell 100.
[0153] According to some embodiments of this application, please refer to FIG2, the battery device 20 further includes a housing beam 21, and a heat insulation member 200 is provided between the housing beam 21 and the battery cell 100.
[0154] The above-mentioned arrangement enables better heat insulation between the box beam 21 and the battery cell 100, reducing the heat diffusion from the battery cell 100 to the box beam 21.
[0155] Please refer to Figure 1. In one embodiment, the heat insulation element 200 is used for the battery device 20. The heat insulation element 200 includes a plate body disposed on at least one side of at least one battery cell 100 in a first direction. The plate body is made of foamed material and has a low foaming structure 201 and a high foaming structure 202. The density of the high foaming structure 202 is less than the density of the low foaming structure 201.
[0156] It should be noted that the heat insulation component 200 is disposed on at least one side of the battery cell 100 in the first direction. This can be understood as the heat insulation component 200 being located between two adjacent battery cells 100, or between the battery cell 100 and the end cap of the battery casing. The heat insulation component 200 is a component used to reduce heat transfer and heat diffusion, thereby enhancing the heat insulation performance of the battery cell 100 and improving its resistance to thermal runaway. The heat insulation component 200 may be, but is not limited to, a flat body, a cuboid, or other shapes; no specific limitation is made here.
[0157] The aforementioned heat insulation component 200, because the density of the high-foaming structure 202 is lower than that of the low-foaming structure 201, is more prone to deformation than the low-foaming structure 201. While the low-foaming structure 201 restricts the expansion and deformation of the battery cell 100, the high-foaming structure 202 can provide release space for the expansion of the battery cell 100, so that the heat insulation component 200 has good heat insulation performance and the ability to adapt to the expansion and deformation of the battery cell 100.
[0158] Please refer to Figure 1. In one embodiment, the electrical device includes the battery device 20 or the heat insulation component 200 described above.
[0159] It should be noted that electrical equipment can include, but is not limited to, vehicles, mobile phones, portable devices, laptops, ships, spacecraft, electric toys, and power tools, etc.
[0160] The aforementioned electrical equipment, by having the heat insulation component 200 have a low-foaming structure 201 and a high-foaming structure 202, since the density of the high-foaming structure 202 is lower than that of the low-foaming structure 201, the high-foaming structure 202 is more prone to deformation than the low-foaming structure 201. While the low-foaming structure 201 restricts the expansion and deformation of the battery cell 100, the high-foaming structure 202 can provide release space for the expansion of the battery cell 100, so that the heat insulation component 200 has good heat insulation performance and the ability to adapt to the expansion and deformation of the battery cell 100.
[0161] According to some embodiments of this application, referring to Figures 2 to 8, this application provides a battery device 20, which includes at least two battery cells 100 and a heat insulation component 200. The at least two battery cells 100 are arranged side by side along a first direction, and the heat insulation component 200 is disposed on at least one side of at least one battery cell 100 in the first direction. The heat insulation component 200 has a low-foaming structure 201 and a high-foaming structure 202, the density of the high-foaming structure 202 being less than the density of the low-foaming structure 201. The density of the low-foaming structure 201 ranges from 0.5 g / cm³ to 1.3 g / cm³, and the density of the high-foaming structure 202 ranges from 0.2 g / cm³ to 0.9 g / cm³. The heat insulation component 200 includes a plate and at least two hollow portions, each hollow portion being doped into the plate. Each hollow portion is constructed as a hollow glass bead structure, and the outer diameter of each hollow portion ranges from 2 μm to 130 μm.
[0162] According to some embodiments of this application, referring to Figures 2 to 8, this application provides a heat insulation component 200, which includes a plate body disposed on at least one side of at least one battery cell 100 in a first direction; wherein the plate body is made of foamed material, and the plate body has a low foaming structure 201 and a high foaming structure 202, the density of the high foaming structure 202 being less than the density of the low foaming structure 201.
[0163] According to some embodiments of this application, referring to FIG1, this application provides an electrical device, which includes the battery device 20 or the heat insulation component 200 described above.
[0164] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0165] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A battery device (20), characterized in that, include: At least two battery cells (100) are arranged side by side along a first direction; A heat insulation element (200) is disposed on at least one side of at least one of the battery cells (100) in the first direction; The heat insulation component (200) has a low foaming structure (201) and a high foaming structure (202), wherein the density of the high foaming structure (202) is less than the density of the low foaming structure (201).
2. The battery device (20) according to claim 1, characterized in that, The heat insulation component (200) includes a plate body, the plate body including a first surface (210) and a second surface (220) disposed opposite to each other along the first direction, the first surface (210) being adjacent to the battery cell (100), and the high foaming structure (202) and the low foaming structure (201) being formed between the first surface (210) and the second surface (220).
3. The battery device (20) according to claim 2, characterized in that, The plate also includes a third surface (230), a fourth surface (240), a fifth surface (250), and a sixth surface (260) connecting the first surface (210) and the second surface (220), wherein at least one of the first surface (210), the second surface (220), the third surface (230), the fourth surface (240), the fifth surface (250), and the sixth surface (260) forms the low-foaming structure (201).
4. The battery device (20) according to claim 3, characterized in that, The third surface (230), the fourth surface (240), the fifth surface (250) and the sixth surface (260) are all the low-foaming structure (201).
5. The battery device (20) according to claim 4, characterized in that, Along the direction perpendicular to the third surface (230), the thickness of the low-foaming structure (201) of the third surface (230) ranges from 0.1 mm to 2 mm.
6. The battery device (20) according to any one of claims 3-5, characterized in that, Both the first surface (210) and the second surface (220) are the low-foaming structure (201).
7. The battery device (20) according to claim 6, characterized in that, Along the direction perpendicular to the first surface (210), the thickness of the low-foaming structure (201) of the first surface (210) ranges from 0.1 mm to 2 mm.
8. The battery device (20) according to any one of claims 6-7, characterized in that, A cross section is taken of the heat insulation member (200) along a direction perpendicular to the first surface (210). The high-density foaming structure (202) between the first surface (210) and the second surface (220) is located in the middle region of the heat insulation member (200), and the low-density foaming structure (201) surrounds the outer periphery of the high-density foaming structure (202).
9. The battery device (20) according to claim 8, characterized in that, Along the first direction, the dimensions of the low-foaming structure (201) between the first surface (210) and the second surface (220) are 1 mm to 5 mm.
10. The battery device (20) according to any one of claims 8-9, characterized in that, Along the second direction, the dimensions of the low-foaming structure (201) between the first surface (210) and the second surface (220) are 1 mm to 10 mm, and the second direction is the height direction of the heat insulation member (200).
11. The battery device (20) according to any one of claims 8-10, characterized in that, A cross-section of the heat insulation member (200) is taken along a direction perpendicular to the first surface (210), and the cross-section of the high-foaming structure (202) between the first surface (210) and the second surface (220) is elliptical.
12. The battery device (20) according to claim 11, characterized in that, The two apexes of the ellipse are located near the third surface (230) and the fourth surface (240), respectively.
13. The battery device (20) according to any one of claims 2-12, characterized in that, The first surface (210) includes a first position, and the second surface (220) includes a second position, the first position and the second position respectively forming the low-foaming structure (201).
14. The battery device (20) according to claim 13, characterized in that, The first position and the second position are two positions that are set opposite to each other along the first direction.
15. The battery device (20) according to claim 14, characterized in that, The low-foaming structure (201) formed at the first position forms a circular region on the first surface (210), and the circular region is made of foaming material.
16. The battery device (20) according to claim 15, characterized in that, A cross-section of the thermal insulation member (200) is made at the first position along a direction perpendicular to the first surface (210), and the cross-section of the low-foaming structure (201) at the first position is semi-circular.
17. The battery device (20) according to any one of claims 13-16, characterized in that, A cross section is made of the heat insulation member (200) at the first position along a direction perpendicular to the first surface (210), and the low foaming structure (201) at the first position is connected to the low foaming structure (201) at the second position.
18. The battery device (20) according to any one of claims 13-16, characterized in that, The number of the first positions is at least two, and each of the first positions is spaced apart along the height direction of the heat insulation member (200), and at least one of the low foaming structures (201) is formed at any one of the first positions.
19. The battery device (20) according to any one of claims 13-16, characterized in that, The number of the second positions is at least two, and each of the second positions is spaced apart along the height direction of the heat insulation member (200), and each of the second positions is formed with at least one of the low foaming structures (201).
20. The battery device (20) according to any one of claims 2-19, characterized in that, The heat insulation component (200) further includes at least two hollow portions, each of which is incorporated into the plate body, and the plate body has the low-foaming structure (201) and the high-foaming structure (202).
21. The battery device (20) according to claim 20, characterized in that, Each of the hollow portions is constructed as a hollow glass bead structure.
22. The battery device (20) according to claim 20, characterized in that, The outer diameter of each hollow part ranges from 2 μm to 130 μm.
23. The battery device (20) according to any one of claims 1-22, characterized in that, The density ratio of the low-foaming structure (201) to the density ratio of the high-foaming structure (202) is 1.1 to 5.
24. The battery device (20) according to claim 23, characterized in that, The density of the low-foaming structure (201) ranges from 0.5 g / cm3 to 1.3 g / cm3.
25. The battery device (20) according to claim 23, characterized in that, The density of the high-foaming structure (202) ranges from 0.2 g / cm3 to 0.9 g / cm3.
26. The battery device (20) according to any one of claims 1-22, characterized in that, The battery device (20) also includes a box beam (21), and the heat insulation component (200) is provided between the box beam (21) and the battery cell (100).
27. A heat insulation element (200) for use in a battery device (20) as described in any one of claims 1-26, characterized in that, include: A plate is disposed on at least one side of at least one of the battery cells (100) in the first direction; The plate is made of foamed material and has a low foaming structure (201) and a high foaming structure (202). The density of the high foaming structure (202) is less than that of the low foaming structure (201).
28. An electrical appliance, characterized in that, Includes the battery device (20) as described in any one of claims 1-26 or the heat insulation element (200) as described in claim 27.