Heat absorption device, battery assembly and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a heat absorption device, a battery assembly and electric equipment, the heat absorption device comprises a negative Poisson's ratio assembly and a heat absorption material, the negative Poisson's ratio assembly comprises a negative Poisson's ratio structure, and the heat absorption material is arranged on the negative Poisson's ratio assembly. According to the heat absorption device provided by the embodiment of the invention, the heat of the battery can be effectively reduced, and safety accidents such as explosion caused by overhigh heat of the battery are reduced or avoided, so that the safety of the battery pack is effectively improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a heat-absorbing device, a battery assembly, and an electrical device. Background Technology

[0002] Vehicles are the most commonly used means of transportation for people's daily travel. With the continuous improvement of people's environmental awareness, new energy vehicles, which use batteries as a power source, have zero emissions, are environmentally friendly, energy-saving and environmentally friendly, and are increasingly favored by people.

[0003] The battery pack is a crucial component of new energy vehicles. It typically consists of a casing and the batteries within it, which provide power to the motor. Batteries are prone to overheating during operation, and under certain unforeseen circumstances, they can experience thermal runaway, generating a large amount of hot gas. If the batteries are not cooled promptly, excessive heat can affect the normal operation of batteries adjacent to those experiencing thermal runaway, and may even lead to thermal runaway at the battery pack level, compromising battery pack safety and posing a significant safety hazard. Utility Model Content

[0004] This application provides a heat-absorbing device, a battery assembly, and an electrical device, which can effectively reduce safety hazards of battery packs and improve battery pack safety.

[0005] One aspect of this application provides a heat-absorbing device for use in a battery, comprising:

[0006] A negative Poisson's ratio component, the negative Poisson's ratio component comprising a negative Poisson's ratio structure;

[0007] A heat-absorbing material is disposed in the negative Poisson's ratio component.

[0008] This embodiment of the application incorporates a negative Poisson's ratio component and a heat-absorbing material within the heat-absorbing device. When the battery experiences thermal runaway, it generates heat and expands, compressing the heat-absorbing device. Under this pressure, the negative Poisson's ratio component deforms in the opposite direction to the compression force, increasing its thickness and thus the overall thickness of the heat-absorbing device. This effectively increases the distance between adjacent batteries, isolating them from other components and reducing heat transfer between batteries or between batteries and other parts. This prevents the heat generated by the thermally runaway battery from being transferred to other batteries or components, effectively reducing or preventing adverse effects of thermal runaway on other batteries or components. Furthermore, the heat-absorbing material undergoes a phase change reaction upon receiving heat from the battery, absorbing heat during the phase change and cooling the battery. This effectively reduces battery heat, minimizing or preventing explosions and other safety accidents caused by overheating, thereby significantly improving battery pack safety.

[0009] In one possible implementation, the heat-absorbing device further includes a housing having a first receiving cavity;

[0010] Both the negative Poisson's ratio component and the heat-absorbing material are located within the first accommodating cavity.

[0011] In one possible implementation, the negative Poisson's ratio component includes a plurality of negative Poisson's ratio structures, with gaps formed between the plurality of negative Poisson's ratio structures, the gaps being filled with the heat-absorbing material; and / or

[0012] The negative Poisson's ratio structure has a second receiving cavity, which is filled with the heat-absorbing material.

[0013] In one possible implementation, multiple negative Poisson ratio structures are distributed in an M-row N-column configuration.

[0014] In one possible implementation, the cross-sectional shape of the negative Poisson's ratio structure includes an arrowhead shape and / or a concave hexagon.

[0015] In one possible implementation, the heat-absorbing material is a liquid phase change material or a gel phase change material; the liquid phase change material includes liquid paraffin, ethanol, ethylene glycol, or glycerol; the gel phase change material includes hydrogel, alcohol gel, or water-alcohol hybrid gel.

[0016] In one possible implementation, there are multiple housings distributed along the length of the heat-absorbing device;

[0017] There is a connecting part between two adjacent shells, and the interior of the connecting part has a channel, and the first receiving cavities of the two adjacent shells are connected through the channel of the connecting part.

[0018] In one possible implementation, the ratio of the dimension of the connecting portion in the thickness direction of the housing to the thickness of the housing is 0.05 to 1;

[0019] And / or, the ratio of the dimension of the connecting part in the housing arrangement direction to the thickness of the housing is 0.1 to 2.

[0020] In one possible implementation, the housing is an aluminum alloy housing, a steel housing, or a fiber-reinforced composite housing.

[0021] In one possible implementation, the connection is a flexible thin-film structure.

[0022] In one possible implementation, the connecting part is an aluminum foil structure, a copper foil structure, a stainless steel foil structure, a polyethylene terephthalate film structure, a polyimide film structure, a polymer film structure, or an aluminum-plastic film structure.

[0023] In one possible implementation, the negative Poisson's ratio component is configured to increase in thickness when subjected to pressure in a first direction; the first direction is the thickness direction of the heat-absorbing device.

[0024] In one possible implementation, the heat-absorbing device is a cuboid, and the heat-absorbing material is distributed along the entire length and / or width of the heat-absorbing device.

[0025] A second aspect of this application provides a battery assembly including a battery and any of the above-described heat-absorbing devices, the heat-absorbing devices being located on the surface of the battery.

[0026] In one possible implementation, the battery assembly includes a plurality of batteries, and the heat-absorbing device is disposed between at least two adjacent batteries of the plurality of batteries; the arrangement direction of the two adjacent batteries is the same as the thickness direction of the heat-absorbing device.

[0027] In one possible implementation, the negative Poisson's ratio component in the heat-absorbing device is configured to increase the distance between the batteries on both sides of the negative Poisson's ratio component when one of the batteries experiences thermal runaway and expands, causing the negative Poisson's ratio component to be compressed.

[0028] A third aspect of this application provides an electrical device, including a device body and the battery assembly described above. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0031] Figure 2 An exploded view of a battery pack provided in an embodiment of this application;

[0032] Figure 3 This is a schematic diagram of the structure of a battery assembly provided in an embodiment of this application;

[0033] Figure 4A front sectional view of a heat-absorbing device provided in an embodiment of this application;

[0034] Figure 5 A side sectional view of a heat-absorbing device provided in an embodiment of this application;

[0035] Figure 6 This is a schematic diagram of the structure of a heat absorption device provided in an embodiment of this application;

[0036] Figure 7 This is a schematic diagram of another heat absorption device provided in an embodiment of this application.

[0037] Figure Labels

[0038] 100 - Heat absorption device;

[0039] 110 - Housing; 111 - First receiving cavity;

[0040] 120 - Negative Poisson's ratio component; 121 - Second receiving cavity; 122 - Negative Poisson's ratio structure;

[0041] 130 - Connecting part; 131 - Channel;

[0042] 140 - Heat-absorbing material;

[0043] 200-battery;

[0044] 10-Battery assembly;

[0045] 20 - Outer shell. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0047] This application provides a heat-absorbing device, a battery assembly including the heat-absorbing device, and an electrical device including the battery assembly. The battery assembly can be a battery module or a battery pack, and the electrical device can be any device with a battery assembly, such as an energy storage device or a vehicle. In this application embodiment, a vehicle is used as an example of the electrical device.

[0048] The vehicle can be a sedan, bus, or truck. For example, the vehicle can be a pure electric vehicle, a hybrid electric vehicle, a range-extended electric vehicle, a plug-in hybrid electric vehicle, a new energy vehicle, or any vehicle equipped with a battery.

[0049] The vehicle may also include a body, axles, and a motor, wherein the battery pack, axles, and motor may all be mounted on the body. The battery pack may be electrically connected to the motor, and the motor may be connected to the axle. The battery pack provides power to the motor, enabling it to rotate. During rotation, the motor drives the axle to rotate, thus allowing the vehicle to move.

[0050] The vehicle body may include a vehicle chassis and a body mounted on the chassis. The body may have a passenger compartment, which may include a driver's seat, passenger seats, etc., where the driver can operate the vehicle. For example, the vehicle body may also include structural components such as a steering wheel, clutch, and brakes to enable the vehicle to perform its full functions; this application does not impose any limitations on these components.

[0051] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application. Figure 2 This is an exploded view of a battery pack provided in an embodiment of this application.

[0052] Battery component 10 can be a battery pack, battery module, etc., see [link / reference]. Figure 1 and Figure 2 As shown, when the battery assembly is a battery pack, the battery pack (i.e., battery assembly 10) may include a housing 20 and batteries 200 located within the housing 20. The housing 20 provides housing space for the batteries 200 and provides protection for the batteries 200. The battery assembly 10 may include multiple batteries 200, which may be stacked. For example, the individual batteries 200 may be electrically connected to each other to jointly provide power to the electrical device.

[0053] However, as described in the background section above, the battery 200 is prone to overheating during operation, or, in some cases, thermal runaway may occur, generating a large amount of hot gas. If the battery 200 is not cooled in time, excessive heat will affect the normal operation of the battery assembly 10, and may even affect the safety of the battery assembly 10, posing a significant safety hazard.

[0054] To address the aforementioned problems, this application provides a heat-absorbing device. By incorporating a negative Poisson's ratio component and a heat-absorbing material within the casing, when a battery experiences thermal runaway, it generates heat and expands, compressing the heat-absorbing device and exerting pressure on it. Under this pressure, the negative Poisson's ratio component in the heat-absorbing device deforms in the opposite direction, increasing its thickness and consequently increasing the overall thickness of the heat-absorbing device. This effectively increases the distance between adjacent batteries, isolating them from other components. This reduces heat transfer between batteries or between batteries and other components, preventing the heat generated by a thermally runaway battery from being transferred to other batteries or components. Therefore, it effectively reduces or avoids the adverse effects of a thermally runaway battery on other batteries or components. When heat-absorbing materials are exposed to heat generated by the battery, they can undergo a phase change reaction and absorb heat during the phase change process, thereby cooling the battery. This can effectively reduce the battery's heat and reduce or avoid safety accidents such as battery explosions caused by excessive heat, thus effectively improving the safety of the battery pack.

[0055] The following describes in detail a heat-absorbing device provided in an embodiment of this application, with reference to the accompanying drawings.

[0056] Figure 3 This is a schematic diagram of the structure of a battery assembly provided in an embodiment of this application. Figure 4 This is a front sectional view of a heat-absorbing device provided in an embodiment of this application. Figure 5 This is a side sectional view of a heat-absorbing device provided in an embodiment of this application. Figure 6 This is a schematic diagram of a heat absorption device provided in an embodiment of this application.

[0057] This application provides a heat absorption device 100, wherein, see... Figure 3 As shown, the heat-absorbing device 100 can be disposed in the battery assembly 10. The heat-absorbing device 100 can be located on the surface of the battery 200. For example, multiple heat-absorbing devices 100 and multiple batteries 200 can be disposed in the battery assembly 10. The heat-absorbing device 100 can be disposed between at least two adjacent batteries 200. The arrangement direction of the two adjacent batteries 200 can be the same as the thickness direction of the heat-absorbing device 100. That is, it can be understood that the heat-absorbing device 100 and the battery 200 are alternately stacked to form the battery assembly 10. The thickness direction of the heat-absorbing device 100 can be understood as the direction in which the size of the heat-absorbing device 100 is the smallest. When the heat-absorbing device 100 is square, that is, thickness ≤ width ≤ length. The heat-absorbing device 100 is located on the surface of the battery 200. The heat-absorbing device 100 and the battery 200 can be in direct contact or not in direct contact.

[0058] See Figure 4 and Figure 5 As shown, it includes a negative Poisson's ratio component 120 and a heat-absorbing material 140, combined with Figure 6 As shown, the negative Poisson's ratio component 120 may include a negative Poisson's ratio structure 122. A negative Poisson's ratio structure is a special material structure characterized by its ability to expand or contract laterally when subjected to longitudinal tension or compression, which is the opposite of the positive Poisson's ratio effect in most materials. In other words, a negative Poisson's ratio structure will deform in the opposite direction to the compressive force when subjected to external pressure.

[0059] The negative Poisson's ratio module 120 is configured to increase the distance between the two cells on either side of the negative Poisson's ratio module 120 when a cell 200 experiences thermal runaway and expansion, causing the negative Poisson's ratio module 120 to be compressed. For example, when the negative Poisson's ratio module 120 is subjected to compressive force, it deforms in the direction opposite to the compressive force. This can be understood as the negative Poisson's ratio module 120 deforming in the opposite direction to the external force when subjected to an external force, thus preventing it from deforming in the same direction as the external force and increasing the distance between two adjacent cells 200.

[0060] The heat-absorbing material 140 can be disposed in the negative Poisson's ratio component 120. The heat-absorbing material 140 will undergo a phase change and absorb heat when heated. For example, the heat-absorbing material 140 can change from a liquid state to a gaseous state and absorb heat in the process of vaporization. Alternatively, the heat-absorbing material 140 can also change from a gel state to a liquid state and absorb heat in the process of liquefaction.

[0061] When battery 200 experiences thermal runaway, it generates heat and expands, compressing heat-absorbing device 100 and exerting pressure on it. Under this pressure, the negative Poisson's ratio component 120 in heat-absorbing device 100 deforms in the opposite direction, increasing its thickness and thus the overall thickness of heat-absorbing device 100. This effectively increases the distance between adjacent batteries 200, isolating them from other components and reducing heat transfer between batteries or between batteries and other components. This prevents the heat generated by the thermally runaway battery 200 from being transferred to other batteries 200 or other components, effectively reducing or preventing adverse effects of thermal runaway battery 200 on other batteries 200 or other components. When the heat-absorbing material 140 receives heat from the battery 200, it can undergo a phase change reaction and absorb heat during the phase change process, thereby cooling down the battery 200. This can effectively reduce the heat of the battery 200, reduce or avoid safety accidents such as explosion caused by excessive heat, and thus effectively improve the safety of the battery assembly 10.

[0062] See also Figure 4 and Figure 5 As shown, the heat-absorbing device 100 may include a housing 110, which may have a first receiving cavity 111. The negative Poisson's ratio component 120 and the heat-absorbing material 140 may both be located within the first receiving cavity 111. The housing provides installation space for the negative Poisson's ratio component 120 and the heat-absorbing material 140, allowing them to be assembled together, making the heat-absorbing device 100 a single integrated structure. This effectively improves the robustness and reliability of the assembly between the negative Poisson's ratio component 120 and the heat-absorbing material 140, effectively reducing or preventing separation between them, thereby significantly improving the structural stability of the heat-absorbing device 100.

[0063] See also Figure 4 and Figure 5 As shown, the negative Poisson's ratio component 120 may include multiple negative Poisson's ratio structures 122, and there may be gaps between the multiple negative Poisson's ratio structures 122. The gaps may be filled with heat-absorbing material 140, which can increase the content of heat-absorbing material 140 in the heat-absorbing device 100, effectively improve the heat absorption efficiency of the heat-absorbing device 100, and improve the cooling effect on the battery 200.

[0064] See also Figure 4 or Figure 5 As shown, the negative Poisson's ratio component 120 may have a second receiving cavity 121. The second receiving cavity 121 may be connected to the first receiving cavity 111. The heat-absorbing material 140 may also fill the second receiving cavity 121. For example, the negative Poisson's ratio structure 122 can be understood as a tubular structure with a hollow interior and openings at both ends. The hollow structure can communicate with the first cavity through the openings at both ends, allowing the heat-absorbing material 140 to fill the second receiving cavity.

[0065] This can further increase the content of heat-absorbing material 140 in heat-absorbing device 100, effectively improve the heat absorption efficiency of heat-absorbing device 100, and enhance the cooling effect on battery 200.

[0066] The negative Poisson's ratio component is configured to increase in thickness when subjected to pressure in a first direction, which is the thickness direction of the heat-absorbing device, i.e. Figure 4The x-direction is considered. When battery 200 experiences thermal runaway and exerts pressure on heat-absorbing device 100, the negative Poisson's ratio component 120 in heat-absorbing device 100 deforms in the opposite direction to the pressure, increasing its thickness and thus the overall thickness of heat-absorbing device 100. This effectively increases the distance between adjacent batteries 200, isolating batteries 200 on both sides of heat-absorbing device 100. This reduces heat transfer between batteries 200 and prevents heat generated by a thermally runaway battery 200 from being transferred to other batteries 200.

[0067] The heat-absorbing device 100 can be a cuboid, with heat-absorbing material 140 distributed along its entire length and / or width. This effectively increases the coverage area of ​​the heat-absorbing material 140 on the heat-absorbing device, thereby increasing its content. This allows the heat-absorbing material 140 to absorb heat and cool the battery along the entire length and / or width of the heat-absorbing device 100, effectively improving the heat absorption efficiency of the heat-absorbing device 100 and enhancing the cooling effect on the battery 200.

[0068] In this embodiment, the housing 110 can be an aluminum alloy housing, a steel housing, or a fiber-reinforced composite housing. For example, the molding material of the housing 110 can be aluminum alloy, steel, or fiber-reinforced composite, which can effectively improve the rigidity of the housing 110, effectively improve the flatness of the surface of the housing 110, and make the housing 110 and the battery 200 fit more tightly, which helps to improve the overall structural stability of the battery assembly 10.

[0069] See also Figure 6 As shown, the negative Poisson's ratio component 120 may include multiple negative Poisson's ratio structures 122, which may be distributed in the first receiving cavity 111 in an M-row, N-column configuration. M and N may both be greater than or equal to 2. For example, M may be 2, 3, or 4, and N may be 3, 6, or 9.

[0070] Each negative Poisson's ratio structure 122 may have a second receiving cavity 121. For example, the negative Poisson's ratio structure 122 may be a tubular structure. Both ends of the tubular negative Poisson's ratio structure 122 may be open, with openings at both ends communicating with the second receiving cavity 121, so that the second receiving cavity 121 in the negative Poisson's ratio structure 122 communicates with the first receiving cavity 111 of the housing 110 through the openings.

[0071] Each negative Poisson's ratio structure 122 undergoes deformation opposite to the direction of the compressive force when subjected to external pressure. This increases the dimension of the negative Poisson's ratio structure 122 in the direction of the compressive force. With multiple negative Poisson's ratio structures 122 distributed in this manner, the negative Poisson's ratio assembly 120 can undergo significant deformation when subjected to external compressive force, effectively increasing the thickness of the heat absorption device 100 and thus providing effective isolation between the batteries 200.

[0072] For example, the cross-sectional shape of the negative Poisson's ratio structure can include an arrow shape and / or a concave hexagon. This can be understood as the tubular negative Poisson's ratio structure 122 having an arrow-shaped or concave hexagonal cross-section. These shapes all possess good negative Poisson's ratio characteristics and can effectively deform in the opposite direction to the external compressive force. This effectively increases the thickness of the heat absorption device 100 and the distance between adjacent batteries 200, thereby effectively improving the isolation effect between the batteries 200.

[0073] In this embodiment, the heat-absorbing material 140 can be a liquid phase change material or a gel phase change material. The liquid phase change material can undergo a vaporization reaction and become gaseous when heated. Furthermore, during the vaporization process, the heat-absorbing material 140 can absorb heat from the battery 200, thereby cooling the battery 200 and preventing overheating that could lead to a safety accident, effectively improving the safety of the battery assembly 10.

[0074] The gel phase change material can undergo a liquefaction reaction and become liquid when heated. Furthermore, during the liquefaction process, the heat-absorbing material 140 can also absorb heat from the battery 200, thereby cooling the battery 200 and preventing safety accidents caused by overheating, effectively improving the safety of the battery assembly 10.

[0075] For example, a liquid phase change material includes at least one of liquid paraffin, ethanol, ethylene glycol, or glycerol. For example, it can be liquid paraffin, or it can be ethanol, ethylene glycol, or glycerol. Alternatively, the liquid phase change material can also be a mixture of the above materials.

[0076] The aforementioned materials can all undergo effective vaporization reactions when heated, thereby absorbing a large amount of heat to cool the battery 200. This effectively improves the heat absorption efficiency of the heat absorption device 100 and enhances the safety of the battery assembly 10.

[0077] Gel phase change materials can include hydrogels, alcohol gels, or water-alcohol hybrid gels. For example, a hydrogel can be a gel formed by water and a polymer, an alcohol gel can be a gel formed by an alcohol (i.e., an organic solvent) and a polymer, and a water-alcohol hybrid gel can be a gel formed by water, an organic solvent (i.e., an alcohol), and a polymer.

[0078] The aforementioned gel material can undergo a liquefaction reaction when heated, and during the liquefaction process, it can absorb a large amount of heat from the battery 200 to cool it down, which can effectively improve the heat absorption efficiency of the heat absorption device 100 and enhance the safety of the battery assembly 10.

[0079] Figure 7 This is a schematic diagram of another heat absorption device provided in an embodiment of this application.

[0080] See Figure 7 As shown in the embodiment of this application, there are multiple housings 110, and the multiple housings 110 are arranged along the length direction of the heat absorption device 100 (i.e., Figure 7 The distribution is in the y-direction. The length direction of the heat-absorbing device 100 refers to the direction with the largest dimension, meaning that for the heat-absorbing device 100, its length ≥ width ≥ thickness.

[0081] There may be a connecting part 130 between two adjacent housings 110, and the interior of the connecting part 130 may have a channel 131. The first receiving cavities 111 of the two adjacent housings 110 can be connected through the channel 131 of the connecting part 130.

[0082] In this way, the heat-absorbing material 140 can flow between the first receiving cavities 111 of two adjacent housings 110. When a local thermal runaway occurs in the battery 200, the battery 200 at the point of thermal runaway will compress the heat-absorbing device 100 at the corresponding location. Under the action of the compressive force, the negative Poisson's ratio component 120 at this location will thicken while contracting in the length direction. During the contraction of the negative Poisson's ratio component 120 in the length direction, it will generate suction force on the heat-absorbing material 140 in the adjacent housing 110, thereby drawing the heat-absorbing material 140 in the adjacent housing 110 into the housing 110 at the point of thermal runaway. This increases the amount of heat-absorbing material 140 at the point of thermal runaway, thereby effectively improving the heat absorption efficiency at the point of thermal runaway and enhancing the cooling effect on the thermally runaway battery 200.

[0083] The connecting part 130 can be a flexible thin film structure. The thin film structure can absorb and buffer forces, reducing the force transmission between two adjacent housings 110. When thermal runaway occurs in the battery 200 part corresponding to one of the housings 110 and compresses the heat absorption device 100 in that part, the deformation of the heat absorption device 100 in that part can be reduced or avoided from being transmitted to the heat absorption devices 100 in the adjacent housings 110. This can also reduce or avoid deformation of the heat absorption devices 100 in other parts, thereby improving the anti-interference performance between the corresponding heat absorption devices 100 of two adjacent housings 110.

[0084] The connecting part 130 can be an aluminum foil structure, copper foil structure, stainless steel foil structure, polyethylene terephthalate film structure, polyimide film structure, polymer film structure, or aluminum-plastic film structure. That is, the connecting part 130 can be a structural component made of aluminum foil, copper foil, stainless steel foil, polyethylene terephthalate film, polyimide film, polymer film, or aluminum-plastic film. These materials all have good flexibility, which allows the connecting part 130 to provide a better flexible connection between two adjacent housings 110, effectively reducing the force transmission between the two adjacent housings 110 and improving the anti-interference performance between the heat absorption devices 100 corresponding to the two adjacent housings 110.

[0085] See also Figure 7 As shown, the connecting portion 130 is in the thickness direction of the housing 110 (i.e., Figure 7 The ratio of the dimension l in the x-direction (in the case of the housing 110) to the thickness L of the housing 110 can be 0.05 to 1. Here, that is, the ratio of the thickness of the connecting portion 130 to the thickness of the housing 110 is 0.05 to 1, and the thickness direction of the connecting portion 130 is consistent with the thickness direction of the housing 110, meaning the connecting portion 130... Figure 7 The dimensions in the x-direction are similar to those of the housing 110. Figure 7 The ratio of the dimensions in the x-direction is 0.05 to 1. This increases the cross-sectional size of the channel 131 in the connection 130, allowing the heat-absorbing material 140 to flow smoothly in the channel 131, which helps to improve the stability of the flow of the heat-absorbing material 140 between two adjacent shells 110.

[0086] See also Figure 7 As shown, the connecting part 130 is arranged in the direction of the housing 110 (i.e., Figure 7 The ratio of the dimension d in the y-direction (as shown in the image) to the thickness L of the housing 110 is 0.1 to 2, that is, the ratio of the length d of the connecting portion 130 to the thickness L of the housing 110 is 0.1 to 2. The length direction of the connecting portion 130 is consistent with the length direction of the housing 110, meaning the connecting portion 130... Figure 7 The dimension in the y-direction is different from that of the housing 110. Figure 7 The ratio of the dimensions in the x-direction is 0.1 to 2, which can increase the size range of the connecting part 130 and enable the connecting part 130 to provide a better flexible connection between two adjacent housings 110, thereby effectively improving the anti-interference performance between two adjacent housings 110.

[0087] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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. Therefore, they should not be construed as limitations on this utility model.

[0088] In the description of this utility model, it should be understood that the terms "comprising" and "having" as used herein, and any variations thereof, are intended to cover non-exclusive inclusion, for example, a process, method, system, product, or device that includes a series of steps or units is not necessarily limited to those steps or units that are explicitly listed, but may include other steps or units that are not explicitly listed or that are inherent to such process, method, product, or device.

[0089] 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 direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features.

[0090] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A heat-absorbing device for use in a battery, characterized in that, include: A negative Poisson ratio component (120) includes a negative Poisson ratio structure (122). Heat-absorbing material (140), the heat-absorbing material being disposed on the negative Poisson's ratio component (120). The housing (110) has a first receiving cavity (111). The negative Poisson's ratio component (120) and the heat-absorbing material (140) are both located within the first receiving cavity (111).

2. The heat-absorbing device according to claim 1, characterized in that, The negative Poisson's ratio component (120) includes a plurality of negative Poisson's ratio structures (122), with gaps formed between the plurality of negative Poisson's ratio structures (122), the gaps being filled with the heat-absorbing material (140); and / or The negative Poisson's ratio structure (122) has a second receiving cavity (121) filled with the heat-absorbing material (140).

3. The heat-absorbing device according to claim 1, characterized in that, The cross-sectional shape of the negative Poisson's ratio structure includes arrow-shaped and / or concave hexagonal shapes.

4. The heat-absorbing device according to any one of claims 1 to 3, characterized in that, The heat-absorbing material (140) is a liquid phase change material or a gel phase change material; the liquid phase change material includes liquid paraffin, ethanol, ethylene glycol or glycerol; the gel phase change material includes hydrogel, alcohol gel or water-alcohol mixed gel.

5. The heat-absorbing device according to claim 1, characterized in that, The number of the housings (110) is multiple, and the multiple housings (110) are distributed along the length direction of the heat absorption device; There is a connecting part (130) between two adjacent housings (110), and the interior of the connecting part (130) has a channel (131). The first receiving cavities (111) of the two adjacent housings (110) are connected through the channel (131) of the connecting part (130).

6. The heat-absorbing device according to claim 5, characterized in that, The ratio of the dimension of the connecting portion (130) in the thickness direction of the housing (110) to the thickness of the housing (110) is 0.05 to 1; and / or The ratio of the dimension of the connecting part (130) in the housing arrangement direction to the thickness of the housing (110) is 0.1 to 2.

7. The heat-absorbing device according to claim 1, characterized in that, The shell (110) is an aluminum alloy shell, a steel shell, or a fiber-reinforced composite material shell.

8. The heat-absorbing device according to claim 5, characterized in that, The connecting part (130) can be an aluminum foil structure, a copper foil structure, a stainless steel foil structure, a polyethylene terephthalate film structure, a polyimide film structure, a polymer film structure, or an aluminum-plastic film structure.

9. The heat-absorbing device according to claim 1, characterized in that, The negative Poisson's ratio component (120) is configured to increase in thickness when subjected to pressure in a first direction; the first direction is the thickness direction of the heat-absorbing device.

10. The heat-absorbing device according to claim 1 or 9, characterized in that, The heat-absorbing device is a cuboid, and the heat-absorbing material (140) is distributed along the entire length and / or width of the heat-absorbing device.

11. A battery assembly, characterized in that, It includes a battery (200) and a heat-absorbing device according to any one of claims 1 to 10, the heat-absorbing device being located on the surface of the battery (200).

12. The battery assembly according to claim 11, characterized in that, The battery assembly includes a plurality of batteries (200), and the heat absorption device is disposed between at least two adjacent batteries (200); the arrangement direction of the two adjacent batteries (200) is the same as the thickness direction of the heat absorption device.

13. The battery assembly according to claim 12, characterized in that, The negative Poisson's ratio component (120) in the heat absorption device is configured to increase the distance between the batteries (200) on both sides of the negative Poisson's ratio component (120) when one of the batteries undergoes thermal runaway and expands, causing the negative Poisson's ratio component (120) to be compressed.

14. An electrical appliance, characterized in that, Includes the battery assembly as described in any one of claims 11-13.

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