Blocking device, battery assembly and electric equipment

Abstract

The utility model relates to the technical field of batteries, and provides a blocking device, a battery assembly and electric equipment, the blocking device comprises a plurality of negative Poisson's ratio assemblies arranged at intervals, and each negative Poisson's ratio assembly comprises a negative Poisson's ratio structure. Every two adjacent negative poisson ratio assemblies are connected through a flexible structure. When the battery is subjected to thermal runaway and expands, the negative Poisson's ratio assembly deforms under the action of the extrusion force of the battery, so that the thickness of the negative Poisson's ratio assembly is increased. According to the battery pack, the distance between the two adjacent batteries can be effectively increased, so that heat transfer between the batteries is reduced, the flexible structure can absorb impact force and provide buffering force, the anti-interference performance between the two adjacent first areas can be improved, and the safety of the battery pack is improved.

Description

Technical Field

[0001] This application relates to the field of battery technology, and more particularly to a barrier device, battery assembly, and electrical equipment. 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, are emission-free, environmentally friendly, energy-saving and environmentally friendly, and are increasingly favored by people.

[0003] New energy vehicles typically consist of a battery pack and a motor. The battery pack is electrically connected to the motor, providing power to drive the vehicle. The battery pack includes a casing and the batteries within it, which provide electrical energy to the motor. Batteries are prone to overheating during operation, and in some unexpected situations, they can experience thermal runaway, generating large amounts of hot gas. Localized thermal runaway in one battery area often transfers heat to adjacent battery areas, adversely affecting other batteries. This significantly increases the safety risks of the battery pack and reduces its overall safety. Utility Model Content

[0004] This application provides a barrier device, a battery assembly, and an electrical device that can effectively reduce safety hazards in battery packs and improve battery pack safety.

[0005] One aspect of this application provides a blocking device, including a plurality of spaced-apart negative Poisson ratio components, wherein the negative Poisson ratio components include a negative Poisson ratio structure;

[0006] The two adjacent negative Poisson ratio components are connected by a flexible structure.

[0007] By incorporating negative Poisson's ratio components within the barrier device, adjacent negative Poisson's ratio components are connected via a flexible structure. When a battery experiences thermal runaway, it generates heat and expands, compressing the barrier device. Under this pressure, the negative Poisson's ratio components within the barrier device deform in the opposite direction, increasing their thickness. This effectively increases the distance between adjacent batteries, reducing heat transfer and preventing the heat generated by the thermally runaway battery from spreading to other batteries. It also facilitates heat dissipation through the barrier device, effectively reducing safety hazards and improving battery pack safety. The flexible components provide a connection between adjacent negative Poisson's ratio components, allowing them to be integrated into a single unit, thus enhancing the structural stability of the barrier device. The flexible structure absorbs impact forces, providing a buffer between adjacent negative Poisson's ratio components and reducing force transmission between adjacent first regions. When thermal runaway occurs in the battery section corresponding to one of the first regions and the barrier device in that section is squeezed, the deformation of the barrier device in that section can be reduced or prevented from being transmitted to the barrier device corresponding to the adjacent first region. This can reduce or prevent the deformation of the barrier devices in other sections, thereby improving the anti-interference performance between the corresponding barrier devices of two adjacent first regions and effectively enhancing the safety of the battery pack.

[0008] One possible implementation also includes:

[0009] A housing, the housing comprising at least two first regions and a second region located between two adjacent first regions;

[0010] The first region encloses a first receiving cavity, and the negative Poisson's ratio component is located within the first receiving cavity;

[0011] Furthermore, the second region is the aforementioned flexible structure.

[0012] In one possible implementation, the negative Poisson's ratio component has a second receiving cavity, and the first receiving cavity communicates with the second receiving cavity;

[0013] At least one of the first and second accommodating cavities is provided with heat-absorbing material;

[0014] The heat-absorbing material is configured to undergo a phase change and absorb heat when heated.

[0015] In one possible implementation, the second region has a channel through which the interiors of the first accommodating cavities of two adjacent first regions are connected.

[0016] In one possible implementation, the ratio of the dimension of the channel in the thickness direction of the barrier device to the dimension of the first receiving cavity in the thickness direction of the barrier device is 0.05 to 1.

[0017] In one possible implementation, the ratio of the dimension of the channel in the length direction of the barrier device to the dimension of the first receiving cavity in the thickness direction of the barrier device is 0.1 to 2.

[0018] In one possible implementation, the flexible structure 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.

[0019] In one possible implementation, the first region is a rigid structure.

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

[0021] In one possible implementation, the negative Poisson's ratio component includes a plurality of negative Poisson's ratio structures, which are distributed in the first receiving cavity in an M-row N-column manner.

[0022] M is greater than or equal to 2, and N is greater than or equal to 2.

[0023] In one possible implementation, the negative Poisson's ratio structure is a negative Poisson's ratio structure.

[0024] In one possible implementation, the cross-sectional shape of the negative Poisson's ratio structure is arrow-shaped or concave hexagonal.

[0025] In one possible implementation, the heat-absorbing material is a liquid phase change material or a gel phase change material.

[0026] In one possible implementation, the liquid phase change material comprises liquid paraffin, ethanol, ethylene glycol, or glycerol.

[0027] In one possible implementation, the gel phase change material includes a hydrogel, an alcohol gel, or a water-alcohol hybrid gel.

[0028] In one possible implementation, the tensile strength of the flexible structure is greater than or equal to 150 MPa; and / or

[0029] The water vapor permeability of the flexible structure is less than or equal to 1 g / (m²). 2 •24h).

[0030] A second aspect of this application provides a battery assembly including a battery and any of the barrier devices described above, the barrier devices being located on the surface of the battery.

[0031] In one possible implementation, the battery assembly includes a plurality of batteries, and the barrier 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 barrier device.

[0032] In one possible implementation, the negative Poisson's ratio component in the barrier 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 undergoes thermal runaway and expands, causing the negative Poisson's ratio component to be compressed.

[0033] A third aspect of this application provides an electrical device including the battery pack described above. Attached Figure Description

[0034] 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.

[0035] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of this application;

[0036] Figure 2 An exploded view of a battery pack provided in an embodiment of this application;

[0037] Figure 3 This is a schematic diagram of the structure of a battery assembly provided in an embodiment of this application;

[0038] Figure 4 A front sectional view of a barrier device provided in an embodiment of this application;

[0039] Figure 5 This is a front sectional view of a corresponding portion of the first region in a barrier device provided in an embodiment of this application;

[0040] Figure 6 This is a schematic diagram of the structure of the first region corresponding to a barrier device provided in an embodiment of this application.

[0041] Figure label:

[0042] 100 - Barrier device;

[0043] 110 - Housing; 111 - First region; 1111 - First receiving cavity;

[0044] 112 - Second Zone; 1121 - Passage;

[0045] 120 - Negative Poisson's ratio component; 121 - Second receiving cavity; 122 - Negative Poisson's ratio structure;

[0046] 130 - Heat-absorbing material;

[0047] 200-battery;

[0048] 10-Battery assembly;

[0049] 20 - Outer shell. Detailed Implementation

[0050] 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 protection scope of this utility model.

[0051] This application provides a barrier device, a battery pack including the barrier device, and an electrical device including the battery pack. The electrical device can be any device with a battery pack, such as an energy storage device or a vehicle. In this application embodiment, a vehicle is used as an example of the electrical device.

[0052] The vehicle can be a passenger car, bus, or truck. For example, the vehicle can be an electric vehicle, a hybrid electric vehicle, a range-extended electric vehicle, a plug-in hybrid electric vehicle, a new energy vehicle, or any vehicle with a battery pack.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] 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.

[0057] However, as described in the background section above, batteries are prone to overheating during operation, and in some cases, thermal runaway can occur, generating a large amount of hot gas. If the battery cannot be cooled down in time, excessive heat can affect the normal operation of the battery pack and even compromise its safety, posing a significant safety hazard.

[0058] To address the aforementioned problems, this application provides a barrier device. By incorporating a negative Poisson's ratio component within the barrier device and defining the casing as a first region and a flexible second region, when a battery experiences thermal runaway, it generates heat and expands, compressing the barrier device. At this time, the negative Poisson's ratio component in the barrier device deforms in the opposite direction to the compressive force, increasing its thickness. This effectively increases the distance between adjacent batteries, reducing heat transfer between them and preventing the heat generated by the thermally runaway battery from being transferred to other batteries. It also facilitates heat dissipation through the barrier device, thereby effectively reducing safety hazards in the battery pack and improving its overall safety. The flexible second region can absorb buffering forces, reducing force transmission between adjacent first regions. When thermal runaway occurs in the battery section corresponding to one of the first regions and the barrier device in that section is squeezed, the deformation of the barrier device in that section can be reduced or prevented from being transmitted to the barrier device corresponding to the adjacent first region. This can reduce or prevent the deformation of the barrier devices in other sections, thereby improving the anti-interference performance between the corresponding barrier devices of two adjacent first regions and effectively enhancing the safety of the battery pack.

[0059] The following describes in detail a barrier device provided in an embodiment of this application, with reference to the accompanying drawings.

[0060] 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 barrier device provided in an embodiment of this application.

[0061] This application provides a barrier device 100, wherein, see... Figure 3 As shown, the barrier device 100 can be disposed in the battery assembly 10. The barrier device 100 can be located on the surface of the battery 200. For example, multiple barrier devices 100 and multiple batteries 200 can be disposed in the battery assembly 10. The barrier 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 barrier device 100. That is, it can be understood that the barrier device 100 and the batteries 200 can be alternately stacked to form the battery assembly 10. The thickness direction of the barrier device 100 can be understood as the direction in which the size of the barrier device 100 is the smallest, that is, thickness ≤ width ≤ length. The barrier device 100 is located on the surface of the battery 200. The barrier device 100 and the battery 200 can be in direct contact or not in direct contact.

[0062] See Figure 4 As shown, the barrier device 100 may have multiple negative Poisson's ratio components 120 arranged at intervals. Each negative Poisson's ratio component 120 may include a negative Poisson's ratio structure. 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 of 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.

[0063] 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 subjected to compressive force, the negative Poisson's ratio module 120 will deform in the opposite direction 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. The second region 112 can be a flexible structure.

[0064] When battery 200 experiences thermal runaway, it generates heat and expands, compressing the barrier device 100 and exerting pressure on it. Under this pressure, the negative Poisson's ratio component 120 within the barrier device 100 deforms in the opposite direction, increasing its thickness and consequently increasing the overall thickness of the barrier device 100. This effectively increases the distance between adjacent batteries 200, further isolating them. This reduces heat transfer between batteries 200, preventing heat from thermally runaway batteries 200 from spreading to other batteries 200. It also facilitates heat dissipation through the barrier device 100, effectively reducing safety hazards and improving the overall safety of the battery assembly 10.

[0065] The flexible structure can provide a connection between two adjacent negative Poisson ratio components 120 so that the two adjacent negative Poisson ratio components 120 can form a whole, which helps to improve the structural stability of the barrier device 100.

[0066] The flexible structure between two adjacent negative Poisson's ratio components 120 can absorb impact forces and reduce the force transmission between them. A flexible structure refers to a structure that can undergo significant deformation under external forces without losing its integrity and function. Such structures typically possess high elasticity and flexibility, enabling them to adapt to changes in the external environment or fluctuations in load.

[0067] When thermal runaway occurs at the battery 200 corresponding to one of the negative Poisson's ratio components 120 and the barrier device 100 at that location is compressed, the deformation of the barrier device 100 at that location can be reduced or prevented from being transmitted to the barrier devices 100 corresponding to adjacent negative Poisson's ratio components 120. This can reduce or prevent deformation of barrier devices 100 at other locations, thereby improving the anti-interference performance between the barrier devices 100 corresponding to two adjacent negative Poisson's ratio components 120 and effectively enhancing the safety of the battery component 10.

[0068] The barrier device 100 may further include a housing 110, which may include at least two first regions 111 and a second region 112 located between two adjacent first regions 111. For example, the housing 110 may be as follows: Figure 3 The diagram shows four first regions 111 and three second regions 112, with the four first regions 111 being connected sequentially through the three second regions 112.

[0069] The first region 111 can form a first receiving cavity, the negative Poisson's ratio component 120 can be located in the first receiving cavity 1111 formed by the first region 111, and the second region 112 can be the above-mentioned flexible structure.

[0070] The housing 110 provides mounting space for the negative Poisson's ratio components 120, allowing them to be assembled together to make the barrier device 100 a single, integrated structure. This effectively improves the robustness and reliability of the assembly between the individual negative Poisson's ratio components 120, and effectively reduces or avoids separation between them, thereby significantly improving the structural stability of the barrier device 100.

[0071] Figure 5 This is a front sectional view of the corresponding portion of the first region in a barrier device provided in an embodiment of this application. Figure 6 This is a schematic diagram of the structure of the first region corresponding to a barrier device provided in an embodiment of this application.

[0072] See Figure 5 and Figure 6 As shown, the negative Poisson's ratio component 120 may have a second receiving cavity 121, and the first receiving cavity 1111 may communicate with the second receiving cavity 121. At least one of the first receiving cavity 1111 and the second receiving cavity 121 is provided with a heat-absorbing material 130. For example, the heat-absorbing material 130 may fill the first receiving cavity 1111, or the heat-absorbing material 130 may also fill the second receiving cavity 121, or the heat-absorbing material 130 may be provided in both the first receiving cavity 1111 and the second receiving cavity 121.

[0073] The heat-absorbing material 130 is configured to undergo a phase change and absorb heat when heated. For example, the heat-absorbing material 130 can vaporize from a liquid state to a gaseous state and absorb heat during the vaporization process. Alternatively, the heat-absorbing material 130 can liquefy from a gel state to a liquid state and absorb heat during the liquefaction process.

[0074] When the battery 200 experiences thermal runaway, it will generate heat and expand. The heat can be transferred through the casing 110 to the heat-absorbing material 130 inside the casing 110. After receiving the heat generated by the battery 200, the heat-absorbing material 130 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 and reduce or avoid safety accidents such as explosion caused by excessive heat, thereby effectively improving the safety of the battery assembly 10.

[0075] See also Figure 3 and Figure 4As shown, the second region 112 may have a channel 1121, and the first receiving cavities 1111 of two adjacent first regions 111 can be connected through the channel 1121.

[0076] In this way, the heat-absorbing material 130 can flow between the first receiving cavities 1111 of two adjacent first regions 111. When a local thermal runaway occurs in the battery 200, the battery 200 at the location of the thermal runaway will compress the corresponding first region 111 of the casing 110. Under the action of the compressive force, the thickness of the negative Poisson's ratio component 120 at this location increases, while the length direction (i.e., Figure 3 The thickness direction of the negative Poisson's ratio component 120 will shrink. The thickness direction of the negative Poisson's ratio component 120 is opposite to the thickness direction of the blocking device 100 (i.e., the thickness direction of the negative Poisson's ratio component 120 is also opposite to the thickness direction of the blocking device 100). Figure 3 The x-direction is consistent with the length direction of the negative Poisson's ratio component 120, and the length direction of the blocking device 100 is consistent with the x-direction. Figure 3 (The y-direction) is consistent. The thickness of the barrier device 100 refers to the direction in which the size of the barrier device 100 is smallest, that is, the thickness of the barrier device 100 ≤ width ≤ length. During the process of the negative Poisson's ratio component 120 shrinking along the length direction, it will generate a suction force on the heat-absorbing material 130 in the adjacent first region 111 housing 110, so as to draw the heat-absorbing material 130 in the adjacent housing 110 into the first receiving cavity 1111 of the thermal runaway location. This increases the amount of heat-absorbing material 130 in the thermal runaway location, thereby effectively improving the heat absorption efficiency of the thermal runaway location and enhancing the cooling effect on the thermal runaway battery 200.

[0077] See also Figure 3 As shown, the ratio of the dimension l of the channel 1121 in the thickness direction of the barrier device 100 to the dimension L of the first receiving cavity 1111 in the thickness direction of the barrier device 100 can be 0.05 to 1. This can increase the size of the channel 1121 inside the housing 110 corresponding to the second region 112, allowing the heat-absorbing material 130 to flow smoothly in the channel 1121, which helps to improve the stability of the flow of the heat-absorbing material 130 between the first receiving cavities 1111 and housings 110 corresponding to two adjacent first regions 111.

[0078] See also Figure 3 As shown, channel 1121 is along the length of the blocking device 100 (i.e., Figure 3 The ratio of the dimension d in the y-direction to the dimension L of the first receiving cavity 1111 in the thickness direction of the blocking device 100 can be 0.1 to 2. This can increase the size range of the second region 112, and enable the second region 112 to provide a better flexible connection between two adjacent first regions 111, thereby effectively improving the anti-interference performance between two adjacent first regions 111.

[0079] The first region 111 can be a rigid structure. A rigid structure is one that is not easily deformed under external forces. This can effectively reduce the deformation of the first region 111 when the battery does not experience thermal runaway, effectively improve the flatness of the surface of the first region 111, and allow the first region 111 to fit more tightly with the battery 200, which helps to improve the overall structural stability of the battery 200 module.

[0080] For example, the first region 111 can be an aluminum alloy shell, a steel shell, or a fiber-reinforced composite shell. For example, the molding material of the first region 111 can be aluminum alloy, steel, or fiber-reinforced composite. This can effectively improve the rigidity of the first region 111 and the surface flatness of the shell 110 in the first region 111, so that the shell 110 and the battery 200 can fit more tightly, which helps to improve the overall structural stability of the battery 200 module.

[0081] The flexible structure (i.e., the second region 112) can be a flexible structure such as 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. That is, the shell 110 at the second region 112 can be a thin film structure 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 second region 112 to provide a better flexible connection between two adjacent first regions 111, effectively reducing the force transmission between two adjacent first regions 111 and improving the anti-interference performance between the corresponding blocking devices 100 of the two adjacent first regions 111.

[0082] The tensile strength of the flexible structure (i.e., the second region 112) can be greater than or equal to 150 MPa, which can improve the structural strength of the flexible structure, reduce or avoid the fracture of the flexible structure under external force, and help improve the structural stability of the battery module 10.

[0083] The tensile strength of the flexible structure can be tested using a universal testing machine, referring to GB / T13542.2—2009 Thin Films for Electrical Insulation Part 2: Test Methods. For example, a load can be applied at a tensile speed of 100 mm / min until the flexible structure breaks. The data obtained at this point is the tensile strength of the flexible structure.

[0084] The water vapor transmission rate of the flexible structure (i.e., the second region 112) can be less than or equal to 1 g / (m²). 2• 24h), which gives the flexible structure good waterproof properties. The water vapor transmission rate of the flexible structure can be tested with reference to GB / T21529-2008 Determination of Water Vapor Transmission Rate of Plastic Films and Sheets by Electrolytic Sensor Method.

[0085] 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, which may be distributed in an M-row, N-column configuration within the first receiving cavity 1111. Here, M can be greater than or equal to 2, and N can be greater than or equal to 2. For example, M can be 2, 3, or 4, etc. N can be 3, 6, 9, etc. Of course, in some examples, M can also be 1, for example, multiple negative Poisson's ratio structures 122 arranged in a single row.

[0086] 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 is connected to the first receiving cavity 1111 corresponding to the first region 111 of the housing 110 through the openings.

[0087] Each negative Poisson's ratio structure 122 undergoes deformation opposite to the direction of the compressive force when subjected to external pressure, thereby increasing the dimension of the negative Poisson's ratio structure 122 in the direction of the compressive force. The distribution of multiple negative Poisson's ratio structures 122 in this manner effectively improves the overall deformation resistance of the negative Poisson's ratio assembly 120. When the negative Poisson's ratio assembly 120 is subjected to external compressive force, it can undergo significant deformation, effectively increasing the thickness of the barrier device 100 and thus effectively isolating the batteries 200.

[0088] For example, the negative Poisson's ratio structure 122 can be a negative Poisson's ratio structure. A negative Poisson's ratio structure is a special material structure characterized by expansion or contraction in the transverse direction when the material is subjected to longitudinal tension or compression, which is the opposite of the positive Poisson's ratio effect of most materials. That is, when a negative Poisson's ratio structure is subjected to external pressure, it will deform in the opposite direction to the compressive force.

[0089] 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 when subjected to external compressive force, they can effectively deform in the opposite direction to the compressive force. This effectively increases the thickness of the barrier device 100, increases the distance between two adjacent batteries 200, and thus effectively improves the isolation effect between the batteries 200.

[0090] In this embodiment, the heat-absorbing material 130 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 130 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.

[0091] The gel phase change material can undergo a liquefaction reaction and become liquid when heated. Furthermore, during the liquefaction process, the heat-absorbing material 130 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.

[0092] For example, liquid phase change materials include at least one of liquid paraffin, ethanol, ethylene glycol, and glycerol. For example, it can be liquid paraffin, or it can be an alcohol. Alternatively, the liquid phase change material can also be a mixture of the above materials.

[0093] 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 barrier device 100 and enhances the safety of the battery assembly 10.

[0094] 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.

[0095] The aforementioned gel material can undergo a liquefaction reaction when heated and become liquid. 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 barrier device 100 and enhance the safety of the battery assembly 10.

[0096] 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.

[0097] 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.

[0098] 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.

[0099] 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 barrier device, characterized in that The barrier device comprises: a plurality of negative Poisson's ratio components (120) arranged at intervals, the negative Poisson's ratio components (120) comprising negative Poisson's ratio structures (122); two adjacent negative Poisson's ratio components (120) are connected by a flexible structure; a shell (110) comprising at least two first regions (111) and a second region (112) between the two adjacent first regions (111); the first regions (111) form first accommodating cavities (1111) in which the negative Poisson's ratio components (120) are located; and the second region (112) is the flexible structure.

2. The barrier device of claim 1, wherein, The negative Poisson's ratio components (120) form second accommodating cavities (121), and the first accommodating cavities (1111) and the second accommodating cavities (121) are in communication; at least one of the first accommodating cavities (1111) and the second accommodating cavities (121) is provided with a heat-absorbing material (130); the heat-absorbing material (130) is configured to absorb heat by phase change when heated.

3. A barrier device according to claim 1 or 2, characterised in that The second region (112) has a channel (1121), and the first accommodating cavities (1111) of the two adjacent first regions (111) are connected by the channel (1121).

4. The barrier device of claim 3, wherein, The ratio of the size of the channel (1121) in the thickness direction of the barrier device to the size of the first accommodating cavities (1111) in the thickness direction of the barrier device is 0.05-1.

5. The barrier device of claim 3, wherein, The ratio of the size of the channel (1121) in the length direction of the barrier device to the size of the first accommodating cavities (1111) in the thickness direction of the barrier device is 0.1-2.

6. The barrier device of any one of claims 1 to 2, wherein, The flexible structure is an aluminum foil structure, a copper foil structure, a stainless steel foil structure, a polyethylene terephthalate film structure, a polyimide film structure, a high molecular polymer film structure, or an aluminum-plastic film structure.

7. The barrier device of claim 1 or 2, wherein, The first region (111) is a rigid structure.

8. The barrier device of claim 7, wherein, The first region (111) is an aluminum alloy shell, a steel shell, or a fiber-reinforced composite shell.

9. The barrier device of any of claims 1 to 2, wherein, The cross-sectional shape of the negative Poisson's ratio structure comprises an arrow shape and / or a concave hexagon.

10. The barrier device of claim 2, wherein, The heat-absorbing material (130) is a liquid phase change material or a gel phase change material; The liquid phase change material comprises at least one of liquid paraffin, ethanol, ethylene glycol, and glycerol; The gel phase change material comprises a hydrogel, an alcohol gel, or a water-alcohol mixed gel.

11. The barrier device of any one of claims 1 to 2, wherein, The tensile strength of the flexible structure is greater than or equal to 150 MPa; and / or The water vapor transmission rate of the flexible structure is less than or equal to 1 g / (m 2 ·24h).

12. A battery assembly characterized by, The barrier device of any one of claims 1-11 is arranged on the surface of a battery (200).

13. The battery assembly of claim 12, wherein, The battery assembly comprises a plurality of batteries (200), and the barrier device is arranged between at least two adjacent batteries (200) of the plurality of batteries (200); the arrangement direction of the two adjacent batteries (200) is the same as the thickness direction of the barrier device.

14. The battery assembly of claim 12, wherein, The negative Poisson's ratio component (120) in the blocking device is configured to increase the distance between the batteries (200) on both sides of the negative Poisson's ratio component (120) when a certain battery (200) experiences thermal runaway and expands to press the negative Poisson's ratio component (120).

15. An electrical device, characterized by The battery assembly comprises the battery assembly of any one of claims 12-14.

Images