Directional heat insulation pad, battery pack, and electric device

Abstract

The present application relates to the technical field of batteries, and provides a directional heat insulation pad, a battery pack, and an electric device. The directional heat insulation pad comprises a heat insulation material layer and directional heat conduction material layers. The directional heat conduction material layers are arranged on both two sides of the heat insulation material layer in the thickness direction thereof. The heat insulation material layer is configured to prevent heat conduction between battery cells, and the directional heat conduction material layer is configured to conduct heat of the battery cells to the outside, so that heat dissipation of battery cells can be facilitated while heat spreading between the battery cells is prevented.

Description

Directional thermal insulation pad, battery pack and electric device

[0001] Cross-reference to Related Applications

[0002] This application claims priority to the Chinese patent application No. 2024106218210, filed on May 20, 2024, entitled “Directional thermal insulation pad, battery pack and electric device”, the entire content of which is incorporated herein by reference. TECHNICAL FIELD

[0003] The present application relates to the technical field of batteries, in particular, to a directional thermal insulation pad, a battery pack and an electric device. BACKGROUND

[0004] Lithium ion batteries are widely used due to their high energy density and good low temperature performance. In practical applications, batteries are often connected in series and parallel to meet energy requirements. The safety of the battery pack is an important technical problem. If a battery cell in the battery pack experiences thermal runaway, it will generate a large amount of heat, causing the surrounding battery cells to overheat and lose control. How to prevent the spread of heat is an important concern in the battery field. Using thermal insulation pads to prevent the spread of heat is one of the mainstream methods.

[0005] However, the use of thermal insulation pads can lead to poor heat dissipation of the battery, which in turn reduces the safety of the battery. For example, in safety tests such as overcharging, the battery cell may experience thermal runaway due to the accumulation of heat that cannot be dissipated.

[0006] SUMMARY

[0007] The present application aims to, for example, provide a directional thermal insulation pad, a battery pack and an electric device, which can facilitate heat dissipation of the battery cell while preventing the spread of heat between the battery cells.

[0008] The present application can be implemented as follows:

[0009] In a first aspect, the present application provides a directional thermal insulation pad, comprising a thermal insulation material layer and a directional heat conduction material layer, the thermal insulation material layer is provided with the directional heat conduction material layer on both sides in the thickness direction of the thermal insulation material layer, the thermal insulation material layer is configured to prevent heat conduction between the battery cells, and the directional heat conduction material layer is configured to conduct heat from the battery cell to the outside.

[0010] Optionally, the directional heat conduction material layer comprises a main body portion and a heat dissipation portion connected to each other, the main body portion is attached to the thermal insulation material layer, the heat dissipation portion extends to the outside of the thermal insulation material layer in the height direction of the main body portion, and the heat dissipation portion is bent relative to the main body portion.

[0011] Optionally, the bending angle of the heat dissipation part relative to the main body part is 90°, and the length of the heat dissipation part in the extension direction thereof is greater than or equal to 5 mm.

[0012] Optionally, the main body part is provided with the heat dissipation part at both ends thereof in the height direction thereof.

[0013] Optionally, the layer of directional heat conductive material is mainly made of directional ceramic material, directional carbon material or directional metal material.

[0014] Optionally, the directional ceramic material includes directional silicon nitride or directional silicon carbide.

[0015] The directional carbon material includes highly directional graphite, nano-carbon or carbon fiber.

[0016] The directional metal material includes metal wire, metal mesh or directionally printed metal conductive path.

[0017] Optionally, the thickness of the layer of directional heat conductive material is 5 μm-5 mm.

[0018] Optionally, the layer of thermal insulation material is mainly made of mica, organic silicon, aerogel or pre-oxidized silk.

[0019] Optionally, the thickness of the layer of thermal insulation material is 10 μm-10 mm.

[0020] Optionally, the directional thermal insulation pad further includes a layer of encapsulation material, and the layer of encapsulation material is arranged on the side of the layer of directional heat conductive material away from the layer of thermal insulation material.

[0021] The layer of encapsulation material is mainly made of polypropylene, polyethylene terephthalate or polyimide material, or the layer of encapsulation material is mainly made of aluminum oxide or mica.

[0022] Optionally, the thickness of the layer of encapsulation material is 3 μm-50 μm.

[0023] In a second aspect, the present application further provides a battery pack including a plurality of battery monomers and the directional thermal insulation pad, and one directional thermal insulation pad is arranged between two adjacent battery monomers.

[0024] Optionally, the battery pack further includes a top heat dissipation structure and a bottom heat dissipation structure, and the top heat dissipation structure and the bottom heat dissipation structure are arranged on the two sides of the directional thermal insulation pad, respectively.

[0025] Optionally, the top heat dissipation structure and the bottom heat dissipation structure are both liquid cooling plates, and the two liquid cooling plates are arranged in parallel.

[0026] In a third aspect, the present application further provides an electric device including the battery pack.

[0027] The beneficial effects of the directional thermal insulation pad, the battery pack and the electric device of the present application include, for example: in order to facilitate heat dissipation of the battery monomer on the basis of preventing heat spread between the battery monomers, a directional thermal insulation pad is designed, which comprises a thermal insulation material layer and a directional heat conduction material layer, the thermal insulation material layer is provided with the directional heat conduction material layer on both sides in the thickness direction of the thermal insulation material layer, when the directional thermal insulation pad is arranged between two adjacent battery monomers, the two directional heat conduction material layers are respectively directed to the two battery monomers, at this time, the thermal insulation material layer can prevent heat spread between the battery monomers, and the directional heat conduction material layer can conduct the heat of the battery monomer to the outside, thereby achieving the effect of facilitating heat dissipation of the battery monomer on the basis of preventing heat spread between the battery monomers. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can also be obtained without creative labor on the basis of these drawings.

[0029] Fig. 1 is a partial structure schematic view of the battery pack in the embodiments of the present application;

[0030] Fig. 2 is a sectional view of the directional thermal insulation pad in the embodiments of the present application;

[0031] Fig. 3 is an exploded view of the directional thermal insulation pad in the embodiments of the present application.

[0032] Fig. 1 is a partial structure schematic view of the battery pack in the embodiments of the present application; DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the following will combine the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, not all of the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the claimed present application, but only represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0035] It should be noted that like reference numerals and letters refer to like items throughout the accompanying drawings, and once an item is defined in one drawing, it is not necessary to further define and explain it in the subsequent drawings.

[0036] In the description of the present application, it should be noted that if the terms "upper", "lower", "inner", "outer" and the like indicate the orientation or positional relationship shown in the drawings, or the orientation or positional relationship in which the product of the present application is usually placed, they are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, if the terms "first", "second" and the like appear, they are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] It should be noted that the features in the embodiments of the present application can be combined with each other without conflict.

[0039] The inventors of the present application found that one of the mainstream methods to prevent heat spread is to use a heat insulation pad, which is usually arranged between two adjacent battery monomers to prevent heat spread. However, the use of the heat insulation pad will cause poor heat dissipation of the battery monomer, which will in turn reduce the safety of the battery, such as in the overcharge safety test, the battery monomer cannot dissipate the accumulated heat, which may cause thermal runaway. The embodiments of the present application provide a battery pack which can facilitate heat dissipation of the battery monomer on the basis of preventing heat spread between the battery monomers.

[0040] Please refer to FIGS. 1-3, the battery pack provided by the embodiments of the present application includes a directional heat insulation pad 1 and a plurality of battery monomers 2, one directional heat insulation pad 1 is arranged between two adjacent battery monomers 2, the directional heat insulation pad 1 includes a heat insulation material layer 11, a directional heat conduction material layer 12 and an encapsulation material layer 13, the directional heat conduction material layer 12 is arranged on both sides of the heat insulation material layer 11 in the thickness direction of the heat insulation material layer 11, the encapsulation material layer 13 is arranged on the side of the directional heat conduction material layer 12 away from the heat insulation material layer 11, the heat insulation material layer 11 is configured to prevent heat conduction between the battery monomers 2, the two directional heat conduction material layers 12 are respectively directed towards the two battery monomers 2, and the directional heat conduction material layer 12 is configured to conduct the heat of the battery monomer 2 to the outside.

[0041] Since the directional heat insulation pad 1 is arranged between two adjacent battery monomers 2, the heat insulation material layer 11 can prevent heat spread between the battery monomers 2, and the directional heat conduction material layer 12 can conduct the heat of the battery monomer 2 to the outside, thereby achieving the effect of heat dissipation of the battery monomer 2 on the basis of preventing heat spread between the battery monomers 2.

[0042] The directional heat-conducting material layer 12 includes a main body part 121 and a heat-dissipating part 122 connected with each other, the main body part 121 is attached to the heat-insulating material layer 11, the heat-dissipating part 122 extends to the outside of the heat-insulating material layer 11 in the height direction of the main body part 121, and the heat-dissipating part 122 is bent relative to the main body part 121.

[0043] In this embodiment, the height direction of the main body part 121 is consistent with the height direction of the heat-insulating material layer 11, the main body part 121 is provided with the heat-dissipating part 122 at both ends in the height direction of the main body part 121, the encapsulating material layer 13 is wrapped outside the main body part 121 and the heat-dissipating part 122, the encapsulating material layer 13 is attached to the battery monomer 2, and the heat-dissipating part 122 is bent relative to the main body part 121 to be attached to the battery monomer 2 attached to the encapsulating material layer 13.

[0044] The battery pack is provided with a top heat-dissipating structure 3 and a bottom heat-dissipating structure 4, the top heat-dissipating structure 3 and the bottom heat-dissipating structure 4 are oppositely arranged on the upper and lower sides of the directional heat-insulating pad 1, one of the heat-dissipating parts 122 is bent relative to the main body part 121 to be attached to the top heat-dissipating structure 3, and the other heat-dissipating part 122 is bent relative to the main body part 121 to be attached to the bottom heat-dissipating structure 4, the bending of the heat-dissipating part 122 relative to the main body part 121 increases the contact area between the heat-dissipating part 122 and the heat-dissipating structure, thereby improving the heat-dissipating effect. The top heat-dissipating structure 3 and the bottom heat-dissipating structure 4 can be liquid cooling plates, air cooling plates or other heat-dissipating structures, and the encapsulating material layer 13 does not encapsulate the surface of the heat-dissipating part 122 facing the heat-dissipating structure, so that the two heat-dissipating parts 122 are directly attached to the top heat-dissipating structure 3 and the bottom heat-dissipating structure 4, thereby improving the heat-dissipating efficiency.

[0045] The left battery monomer 2 in FIG. 1 is in a heat-generating state, the heat-insulating material layer 11 can prevent the heat of the left battery monomer 2 from spreading to the right battery monomer 2, and the directional heat-conducting material layer 12 can conduct the heat of the left battery monomer 2 to the top heat-dissipating structure 3 and the bottom heat-dissipating structure 4 along the main body part 121 in the direction of the heat-dissipating part 122, thereby achieving the effect of dissipating the heat of the battery monomer 2 on the basis of preventing the heat from spreading between the battery monomers 2.

[0046] In this embodiment, the bending angle of the heat-dissipating part 122 relative to the main body part 121 is 90°, and the length of the heat-dissipating part 122 in the extension direction thereof is greater than or equal to 5 mm.

[0047] For example, when the top heat-dissipating structure 3 and the bottom heat-dissipating structure 4 are both liquid cooling plates, the two liquid cooling plates are arranged in parallel, and the bending angle of the heat-dissipating part 122 relative to the main body part 121 is 90°, the two heat-dissipating parts 122 are respectively attached to the plate surfaces of the two liquid cooling plates, at this time, the contact area of the heat-dissipating part 122 with the liquid cooling plate is large, and the heat-dissipating part 122 can have a good heat-dissipating effect.

[0048] In other embodiments, when the top heat dissipation structure 3 and the bottom heat dissipation structure 4 are other heat dissipation structures, or when the liquid cooling plate is arranged in an inclined manner, the bending angle of the heat dissipation part 122 relative to the main body part 121 can also be other angles, as long as the contact area between the heat dissipation part 122 and the heat dissipation structure is large.

[0049] The length of the heat dissipation part 122 in the thickness direction of the thermal insulation material layer 11 is greater than or equal to 5 mm, and the length of the heat dissipation part 122 in the thickness direction of the thermal insulation material layer 11 is less than or equal to the thickness of the battery monomer 2, which can not only ensure that the contact area between the heat dissipation part 122 and the heat dissipation structure is large, but also avoid interference between the heat dissipation parts 122 of adjacent directional thermal insulation pads 1.

[0050] It can be understood that if the heat dissipation part 122 interferes with the structure at the top of the battery monomer 2, a relief structure can be machined on the heat dissipation part 122 to eliminate the interference between the heat dissipation part 122 and the battery monomer 2.

[0051] In this embodiment, the directional heat-conducting material layer 12 is mainly made of directional ceramic material, directional carbon material or directional metal material.

[0052] Optionally, the directional heat-conducting material layer 12 is made of directional ceramic material, or the directional heat-conducting material layer 12 is a high molecular film or coating containing directional ceramic material; or the directional heat-conducting material layer 12 is made of directional carbon material, or the directional heat-conducting material layer 12 contains a high molecular film or coating containing directional carbon material.

[0053] It should be noted that the directional ceramic material refers to a ceramic material whose performance is significantly optimized in a certain direction by controlling the orientation of the internal grains or the crystal structure of the ceramic during the preparation of the material through specific technical means. The characteristics of such materials mainly come from the ordered arrangement of their internal microstructure, which usually shows that the grains or grains grow preferentially in a certain direction, forming a certain degree of arrangement or orientation structure.

[0054] The directional carbon material refers to a carbon matrix material with a highly ordered structure, in which carbon atoms are arranged in a specific arrangement to form a directional structure, which enables the material to exhibit optimized performance in a specific direction, such as enhanced electrical conductivity, thermal conductivity, mechanical properties or structural strength, etc. In this embodiment, the directional carbon material mainly plays the role of thermal conductivity. Such materials are usually designed through special preparation processes to ensure the high order of the carbon structure.

[0055] The directional metal material itself has good thermal conductivity, and in order to make the directional metal material directional heat conduction in a certain direction, the directional metal material is processed into a specific shape, so that the directional metal material extends in a certain direction and conducts heat in that direction.

[0056] The directional ceramic material, the directional carbon material and the directional metal material all have good thermal conductivity and can direct heat conduction in a certain direction. In this embodiment, the heat of the battery monomer 2 can be directed to the heat dissipation part 122 along the main body part 121, and then dissipated to the top heat dissipation structure 3 or the bottom heat dissipation structure 4 by the heat dissipation part 122. Due to the limitation of the heat conduction direction, the heat dissipation efficiency of the battery monomer 2 is higher. In addition, in order to facilitate the adhesion of the heat dissipation part 122 to the top heat dissipation structure 3 or the bottom heat dissipation structure 4, an adhesive or a tape can be used for adhesion.

[0057] In some embodiments, the directional ceramic material includes directional silicon nitride or directional silicon carbide.

[0058] Optionally, the directional heat conduction material layer 12 is made of directional silicon nitride or directional silicon carbide, or the directional heat conduction material layer 12 is a high molecular film or coating containing directional silicon nitride or directional silicon carbide.

[0059] In some embodiments, the directional carbon material includes highly oriented graphite, nanocarbon or carbon fiber.

[0060] The directional heat conduction material layer 12 is made of highly oriented graphite, nanocarbon or carbon fiber, or the directional heat conduction material layer 12 contains a high molecular film or coating of highly oriented graphite, nanocarbon or carbon fiber.

[0061] In some embodiments, the directional metal material includes metal wires, metal mesh or directionally printed metal conductive paths.

[0062] Since the metal wires, the metal mesh and the directionally printed metal conductive paths can be formed into a specific shape by processing, in this embodiment, when the metal wires, the metal mesh or the directionally printed metal conductive paths are processed, the metal wires, the metal mesh and the directionally printed metal conductive paths are made to extend along the main body part 121 in the direction of the heat dissipation part 122. The metal wires, the metal mesh or the directionally printed metal conductive paths can quickly conduct the heat of the battery monomer 2 to the heat dissipation part 122, thereby realizing directional heat conduction.

[0063] In this embodiment, the thickness of the directional heat conduction material layer 12 is 5 μm-5 mm.

[0064] The greater the thickness of the directional heat conduction material layer 12, the stronger the heat conduction capacity. However, if the thickness of the directional heat conduction material layer 12 is too large, it will occupy the space inside the battery pack and affect the overall energy density of the battery pack. Therefore, in this embodiment, the thickness of the directional heat conduction material layer 12 is limited to 5 μm-5 mm.

[0065] Exemplarily, the thickness of the directional heat conduction material layer 12 is 5 μm, 10 μm, 1 mm or 5 mm, and the thickness of the directional heat conduction material layer 12 can be selected within the above range according to actual working conditions. When the thickness of the directional heat conduction material layer 12 is 5 μm-5 mm, the directional heat conduction material layer 12 can have better heat conduction performance and does not occupy too much space inside the battery pack, and has little effect on the overall energy density of the battery pack.

[0066] In this embodiment, the thickness of the thermal insulation material layer 11 is 10 μm-10 mm.

[0067] The thermal insulation material layer 11 can be made of mica, silicone, aerogel or pre-oxidized silk, and the main characteristics are thermal insulation and flame retardation. The thermal insulation material layer 11 can prevent heat conduction on both sides in the thickness direction, so the greater the thickness of the thermal insulation material layer 11, the better the thermal insulation performance. However, if the thickness of the thermal insulation material layer 11 is too large, it will occupy the space inside the battery pack and affect the overall energy density of the battery pack. Therefore, in this embodiment, the thickness of the thermal insulation material layer 11 is limited to 10 μm-10 mm.

[0068] Exemplarily, the thickness of the thermal insulation material layer 11 is 10 μm, 50 μm, 1 mm or 10 mm, and the thickness of the thermal insulation material layer 11 can be selected within the above range according to actual working conditions. When the thickness of the thermal insulation material layer 11 is 10 μm-10 mm, the thermal insulation material layer 11 can have better thermal insulation performance and does not occupy too much space inside the battery pack, and has little effect on the overall energy density of the battery pack.

[0069] In this embodiment, the thickness of the encapsulation material layer 13 is 3 μm-50 μm.

[0070] The encapsulation material layer 13 can be made of PP (polypropylene), PET (polyethylene terephthalate) or PI (polyimide) to form a high-molecular thin film, or made of alumina, mica and other materials to form a flame-retardant coating. The encapsulation material layer 13 encapsulates the directional heat conduction material layer 12 and the thermal insulation material layer 11 on the outermost side by means of hot pressing or coating. The width of the encapsulation material layer 13 in the direction perpendicular to the thickness is greater than that of the directional heat conduction material layer 12 and the thermal insulation material layer 11, so that the encapsulation material layer 13 can have better encapsulation effect on the directional heat conduction material layer 12 and the thermal insulation material layer 11. If the thickness of the encapsulation material layer 13 is too small, it cannot encapsulate the directional heat conduction material layer 12 and the thermal insulation material layer 11, and if the thickness is too large, it will also affect the overall energy density of the battery pack. Therefore, in this embodiment, the thickness of the encapsulation material layer 13 is limited to 3 μm-50 μm.

[0071] Exemplarily, the thickness of the encapsulation material layer 13 is 3 μm, 10 μm, 20 μm or 50 μm, and the thickness of the encapsulation material layer 13 can be selected within the above range according to actual working conditions. When the thickness of the encapsulation material layer 13 is 3 μm-50 μm, the encapsulation material layer 13 can not only achieve a better encapsulation effect, but also will not occupy too much space inside the battery pack, and has a smaller impact on the energy density of the battery pack as a whole.

[0072] The embodiment of the application also provides a power utilization device comprising the battery pack described above. For example, the power utilization device can be a vehicle, a ship, a spacecraft, etc. The vehicle can be a fuel automobile or a new energy automobile, and the new energy automobile can be a pure electric vehicle, a hybrid electric vehicle or a range extended vehicle, etc. The spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc. The embodiment of the application does not specially limit the power utilization device described above.

[0073] The beneficial effects achieved by the embodiment of the application are illustrated by two groups of examples and comparative examples.

[0074] Example One

[0075] The thickness of the heat insulation material layer 11 made of aerogel is 10 μm, the thickness of the directional heat conduction material layer 12 made of directional silicon nitride is 5 μm, the thickness of the encapsulation material layer 13 made of PET is 3 μm, the directional heat conduction material layer 12 is encapsulated to form the directional heat insulation pad 1, the extension length of the heat dissipation part 122 in the directional heat conduction material layer 12 is 5 mm, and the upper and lower heat dissipation parts 122 are respectively attached to the top heat dissipation structure 3 and the bottom heat dissipation structure 4 by using the PI tape with a thickness of 15 μm.

[0076] Comparative Example One

[0077] The thickness of the aerogel heat insulation pad is 10 μm, and only the PET film with a thickness of 3 μm is encapsulated outside the heat insulation pad. The heat insulation pad has no heat conduction material and is not connected to the heat dissipation structure.

[0078] Under the working condition of comparative example one, 50 large-capacity battery monomers 2 with a capacity of 100 Ah are used to form a battery pack by using the 10 μm aerogel heat insulation pad, and then overcharge test is performed. The heat accumulation in the middle position is too large, and cannot be dissipated to the surrounding, resulting in heat accumulation in the battery pack, and finally reaching 300 ℃, which causes fire. Under the working condition of example one, the heat of the battery is conducted to the top heat dissipation structure 3 and the bottom heat dissipation structure 4 during the overcharge test of the battery, and the maximum temperature of the battery is 160 ℃, without fire. The battery pack passes the test.

[0079] Example Two

[0080] The high orientation graphite sheet layer 12 with a thickness of 5 mm is attached to the outside of the pre-oxidized yarn heat insulation material layer 11 with a thickness of 10 mm, the PI film with a thickness of 50 μm is used to encapsulate the encapsulation material layer 13 to form the directional heat insulation pad 1, the extension length of the heat dissipation part 122 of the directional heat conduction material layer 12 is half of the thickness of the battery monomer 2, and the PI tape with a thickness of 15 μm is used to attach the upper and lower heat dissipation parts 122 to the top heat dissipation structure 3 and the bottom heat dissipation structure 4 respectively.

[0081] Comparative Example Two

[0082] The pre-oxidized yarn heat insulation pad with a thickness of 10 mm is used, and only the PI film with a thickness of 50 μm is used for encapsulation outside the heat insulation pad, the heat insulation pad has no heat conduction material and is not connected to the heat dissipation structure.

[0083] Under the working condition of the comparative example two, 50 large-capacity battery monomers 2 with 100 Ah are used to form a battery pack by using the conventional pre-oxidized yarn heat insulation pad with a thickness of 10 mm, and then overcharge test is performed, the heat of the middle position battery is accumulated rapidly and cannot be dissipated, the battery temperature reaches 500 ℃ rapidly, the battery valve is sprayed and burns violently; under the working condition of the example two, the heat of the battery is conducted to the top heat dissipation structure 3 and the bottom heat dissipation structure 4 during the overcharge test of the battery, the maximum temperature of the battery is 60 ℃, the battery does not catch fire, and the battery pack passes the test.

[0084] In summary, the example provides a directional heat insulation pad 1, a battery pack and an electric device, the directional heat insulation pad 1 comprises a heat insulation material layer 11, a directional heat conduction material layer 12 and an encapsulation material layer 13, the encapsulation material layer 13 encapsulates the directional heat conduction material layer 12 and the heat insulation material layer 11 into one, on the one hand, the heat insulation material layer 11 can prevent the heat spread between the battery monomers 2, on the other hand, the directional heat conduction material layer 12 can conduct the heat of the battery monomer 2 to the top heat dissipation structure 3 and the bottom heat dissipation structure 4 along the direction from the main part 121 to the heat dissipation part 122, thereby achieving the effect of dissipating the heat of the battery monomer 2 on the basis of preventing the heat spread between the battery monomers 2.

[0085] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto, any person skilled in the art can easily think of changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims. Industrial applicability

[0086] The heat insulation material layer 11 in the directional heat insulation pad 1 provided in the application is provided with a directional heat conduction material layer 12 on both sides in the thickness direction of the heat insulation material layer 11, when the directional heat insulation pad 1 is arranged between two adjacent battery monomers 2, the two directional heat conduction material layers 12 are respectively directed to the two battery monomers 2, at this time, the heat insulation material layer 11 can prevent the heat spread between the battery monomers 2, and the directional heat conduction material layer 12 can conduct the heat of the battery monomers 2 to the outside, thereby achieving the effect of heat dissipation of the battery monomers 2 on the basis of preventing the heat spread between the battery monomers 2.

Claims

1. A directional insulation mat, characterized in that, The heat insulation material layer (11) is configured to prevent heat conduction between the battery monomers (2), and the directional heat conduction material layer (12) is configured to conduct heat of the battery monomers (2) to the outside.

2. The directional insulation mat of claim 1, wherein, The directional heat conduction material layer (12) includes a main body part (121) and a heat dissipation part (122) connected with each other, the main body part (121) is attached to the heat insulation material layer (11), the heat dissipation part (122) extends to the outside of the heat insulation material layer (11) in the height direction of the main body part (121), and the heat dissipation part (122) is bent relative to the main body part (121).

3. The directional insulation mat of claim 2, wherein, The bending angle of the heat dissipation part (122) relative to the main body part (121) is 90°, and the length of the heat dissipation part (122) in the extension direction thereof is greater than or equal to 5 mm.

4. The directional insulation mat of claim 2, wherein, The main body part (121) is provided with the heat dissipation part (122) at both ends thereof in the height direction thereof.

5. The directional insulation mat of claim 1, wherein, The directional heat conduction material layer (12) is mainly made of directional ceramic material, directional carbon material or directional metal material.

6. The directional insulation mat of claim 5, wherein, The directional ceramic material includes directional silicon nitride or directional silicon carbide; The directional carbon material includes highly directional graphite, nano-carbon or carbon fiber; The directional metal material includes metal wire, metal mesh or directionally printed metal conductive path.

7. The directional insulation mat of claim 1, wherein, The thickness of the directional heat conduction material layer (12) is 5 μm-5 mm.

8. The directional insulation mat of claim 1, wherein, The heat insulation material layer (11) is mainly made of mica, organic silicon, aerogel or pre-oxidized silk.

9. The directional insulation mat of claim 1, wherein, The thickness of the heat insulation material layer (11) is 10 μm-10 mm.

10. The directional insulation mat according to any one of claims 1-9, wherein, The directional heat insulation pad (1) further includes an encapsulation material layer (13) provided on the side of the directional heat conduction material layer (12) away from the heat insulation material layer (11); The encapsulation material layer (13) is mainly made of polypropylene, polyethylene terephthalate or polyimide material, or the encapsulation material layer (13) is mainly made of aluminum oxide or mica.

11. The directional insulation mat of claim 10, wherein, The thickness of the encapsulation material layer (13) is 3 μm-50 μm.

12. A battery pack, characterized by The battery pack further includes a top heat dissipation structure (3) and a bottom heat dissipation structure (4), the top heat dissipation structure (3) and the bottom heat dissipation structure (4) are oppositely arranged on both sides of the directional heat insulation pad (1).

13. The battery pack of claim 12, wherein, The top heat dissipation structure (3) and the bottom heat dissipation structure (4) are both liquid cooling plates, and the two liquid cooling plates are arranged in parallel.

14. The battery pack of claim 13, wherein, The battery pack includes the battery pack according to any one of claims 12-14.

15. An electrical device, comprising: ​

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