Anisotropic thermal management material and preparation method and application thereof

Abstract

The invention relates to an anisotropic thermal management material and a preparation method and application thereof, and belongs to the technical field of thermal management materials. The anisotropic thermal management material is prepared from the following raw materials in parts by weight: 50-90 parts of nano silicon dioxide, 1-15 parts of reinforced fibers, 10-35 parts of a directional thermal conductivity agent, 10-30 parts of an organic solvent, 1-10 parts of an adhesive and 1-10 parts of a dispersing agent, the anisotropic thermal management material is obtained by tiling, laminating and hot-pressing a single-layer film with an oriented structure; the single-layer thin film with the orientation structure is obtained by mixing the raw materials of the anisotropic thermal management material, spreading by a scraper, evaporating, cooling, shaping and drying. The heat management material has excellent heat insulation performance in the vertical direction and good heat dissipation performance in the parallel direction, can meet the two requirements of heat insulation and heat dissipation at the same time, and can be further applied to automobile battery packs.

Description

Technical Field

[0001] This invention relates to the field of thermal management materials technology, and in particular to an anisotropic thermal management material, its preparation method, and its application. Background Technology

[0002] Thermal management of automotive battery packs needs to simultaneously meet the dual requirements of "heat insulation" and "heat dissipation." It requires extreme heat insulation to prevent the spread of thermal runaway, while also ensuring timely heat dissipation during operation to maintain battery temperature uniformity. Currently, nano-insulation panels are commonly used thermal management materials for automotive battery packs. However, the random distribution of their internal components results in essentially uniform thermal performance in all directions, making it impossible to simultaneously provide both "heat insulation" and "heat dissipation" capabilities.

[0003] Therefore, in order to solve the problem that commonly used thermal management insulation materials cannot simultaneously meet the dual requirements of thermal insulation and heat dissipation, it is urgent to develop a new type of thermal management material that can simultaneously meet the performance requirements of thermal insulation and heat dissipation. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention provides an anisotropic thermal management material, its preparation method, and its application.

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

[0006] The first objective of this invention is to provide an anisotropic thermal management material, wherein, by weight, the raw materials of the thermal management material include the following components: 50 to 90 parts of nano-silica, 1 to 15 parts of reinforcing fiber, 10 to 35 parts of directional thermal conductivity agent, 10 to 30 parts of organic solvent, 1 to 10 parts of binder, and 1 to 10 parts of dispersant;

[0007] The anisotropic thermal management material is obtained by laminating and hot-pressing single-layer thin films with an oriented structure.

[0008] The single-layer film with an oriented structure is obtained by mixing the raw materials of the anisotropic thermal management material, spreading it with a doctor blade, evaporating it, cooling it to set it, and drying it.

[0009] In one embodiment of the present invention, the directional thermal conductive agent has a sheet-like structure; the thickness of the sheet-like structure is 1 nm to 100 nm; and the sheet diameter is 10 μm to 100 μm.

[0010] And / or, the directional thermal conductive agent is one or more of silicon carbide, titanium dioxide, carbon black, zirconium oxide, zirconium silicate, potassium titanate, tin oxide, zinc oxide, cerium oxide, iron oxide, manganese dioxide, vanadium dioxide, cobalt oxide, tungsten oxide, chromium oxide, molybdenum disulfide, boron nitride, and boron carbide. The directional thermal conductive agent is in the form of sheets, arranged in a parallel direction (parallel to the plane of the monolayer film itself).

[0011] In one embodiment of the present invention, the particle size of the nano-silica is 5 nm to 100 nm.

[0012] In one embodiment of the present invention, the thickness of the monolayer film with the orientation structure is 10 μm to 100 μm, and the thickness of the monolayer film is smaller than the sheet diameter of the oriented thermal conductive agent.

[0013] In one embodiment of the present invention, the number of layers in the tiling stack is 20 to 250.

[0014] In one embodiment of the present invention, the pressure of the hot pressing is 0.1 MPa to 15 MPa;

[0015] And / or, the temperature of the hot pressing is 25°C to 300°C;

[0016] And / or, the hot pressing time is 10 s to 120 min.

[0017] In one embodiment of the present invention, the reinforcing fiber is one or more selected from quartz fiber, mullite fiber, basalt fiber, alumina fiber, zirconium oxide fiber, silicon oxide fiber, silicon nitride fiber, silicon carbide fiber, and glass fiber.

[0018] In one embodiment of the present invention, the directional thermal conductive agent is prepared by the following method:

[0019] The precursor of the directional thermal conductive agent is brought into full contact with the template material, so that the precursor adheres to the surface or interlayer of the template material and reacts. The template is then removed to obtain the directional thermal conductive agent.

[0020] In one embodiment of the present invention, the template material is a sheet template; the template material is one or more of graphene, graphene oxide, mica sheets, montmorillonite, and layered double hydroxides.

[0021] In one embodiment of the present invention, the reaction is a heat treatment, a vapor deposition, or a liquid-phase reaction.

[0022] In one embodiment of the present invention, the method for removing the template is to selectively remove the template by chemical corrosion or high-temperature calcination to obtain a directional thermally conductive agent with a sheet-like structure.

[0023] In one embodiment of the present invention, the specific preparation method of the directional thermal conductive agent is as follows:

[0024] 1) Graphene, graphene oxide, mica sheets, montmorillonite, and layered double hydroxides are used as sheet templates.

[0025] 2) Make the precursor of the directional thermal conductive agent come into full contact with the template material so that the precursor adheres to the template surface or between layers.

[0026] 3) Reaction and molding: Under specific conditions (such as heat treatment, vapor deposition, liquid phase reaction, etc.), the precursor reacts to generate a coating layer or independent structure of the target oriented thermal conductive agent on the template.

[0027] 4) Template removal: The template is selectively removed by chemical corrosion or high-temperature calcination to obtain a directional thermal conductive agent with a sheet-like structure.

[0028] In one embodiment of the present invention, the organic solvent is one or more of ethanol, n-butanol, tert-butanol, dipropylene glycol, diethylene glycol diethyl ether, diethylene glycol butyl ether, terpineol, isopropanol, and twelfth alcohol ester.

[0029] In one embodiment of the present invention, the adhesive is one or more of the following: silicone resin, epoxy resin, phenolic resin, polyurethane resin, acrylic resin, alkyd resin, polyester resin, polyvinyl alcohol, water glass, aluminum sol, and silica sol.

[0030] In one embodiment of the present invention, the dispersant is one or more of sodium stearate, sodium lauryl sulfonate, sodium dodecylbenzene sulfonate formaldehyde condensate, sodium tripolyphosphate, potassium pyrophosphate, polyethylene glycol, polypropylene glycol, fatty alcohol polyoxyethylene ether, Span series, Tween series, hexadecyltrimethylammonium bromide, dodecyl dimethyl benzyl ammonium chloride, and fatty amine polyoxyethylene ether.

[0031] A second objective of this invention is to provide a method for preparing the anisotropic thermal management material, comprising the following steps:

[0032] S1. Add nano-silica, reinforcing fibers, directional thermal conductivity agent and dispersant to organic solvent, disperse and mix thoroughly, then add binder and mix evenly to obtain slurry;

[0033] S2. The slurry obtained in step S1 is spread onto the base belt by the doctor blade of the casting machine, and a single-layer film with an oriented structure is obtained by evaporation, cooling and shaping and drying.

[0034] S3. The single-layer film obtained in step S2 is laid flat and stacked, and then hot-pressed to obtain the anisotropic thermal management material.

[0035] A third objective of this invention is to provide the application of the anisotropic thermal management material in automotive battery packs.

[0036] The mechanism of this invention is as follows:

[0037] This invention utilizes a unique internal structure formed by directional thermal conductive agents and a method of stacking and pressing single-layer thin films to prepare a thermal management material. This allows the thermal management material to exhibit excellent thermal insulation in the vertical direction (perpendicular to the plane of the single-layer film itself) and good heat dissipation in the parallel direction (parallel to the plane of the single-layer film itself). When heat attempts to pass vertically through the thermal management material, it must continuously penetrate multiple parallel-arranged sheet-like directional thermal conductive agents, minimizing heat loss and ensuring excellent thermal insulation in the vertical direction. In the parallel direction, heat can propagate directionally through the parallel channels between the sheets, encountering far less resistance than in the vertical direction, thus enabling the thermal management material to have good heat dissipation in the parallel direction.

[0038] The unique internal structure formed by the directional thermal conductive agent and the method of stacking and pressing single-layer thin films to prepare thermal management materials have unique anisotropy, which can ensure excellent thermal insulation in the vertical direction and good heat dissipation in the parallel direction, thus solving the problem that current thermal management insulation materials cannot simultaneously meet the dual requirements of thermal insulation and heat dissipation.

[0039] The technical solution of the present invention has the following advantages compared with the prior art:

[0040] This invention provides an anisotropic thermal management material, its preparation method, and its application. The invention customizes the structure of the directional thermal conductive agent and further enhances the anisotropy of the thermal management material by using a single-layer thin film lamination and pressing method. This ensures excellent thermal insulation in the vertical direction and good heat dissipation in the parallel direction, thus simultaneously meeting both insulation and heat dissipation requirements, and can be further applied to automotive battery packs. Attached Figure Description

[0041] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings, wherein:

[0042] Figure 1 This invention relates to the application of thermal management materials in battery packs. Detailed Implementation

[0043] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0044] Unless otherwise specified, the experimental methods used in the following examples are conventional methods, and the materials and reagents used are commercially available.

[0045] Example 1

[0046] This embodiment provides a method for preparing a directional thermal conductivity agent, taking boron nitride as an example, as follows:

[0047] (1) Mixing and adhesion of template material and precursor

[0048] Preparation of graphene oxide dispersion: 100 mg of graphene oxide powder (50 μm in diameter) was added to 500 mL of deionized water and ultrasonically treated for 2 h to form a uniform graphene oxide dispersion.

[0049] Preparation of precursor solution: Dissolve boric acid (1.0 g) and urea (3.0 g) in 100 mL of deionized water and stir (magnetic stirring, 500 rpm) until completely dissolved to form precursor solution.

[0050] Mixing and Adhesion: The graphene oxide dispersion was mixed with the precursor solution and stirred at room temperature for 12 h to allow the precursor to be fully adsorbed onto the surface and interlayer of the graphene oxide. Subsequently, the mixed solution was evaporated and concentrated in a 60 °C water bath to obtain a viscous slurry. Finally, the slurry was dried in a vacuum drying oven at 80 °C for 24 h to obtain the precursor / graphene oxide composite powder.

[0051] (2) Reaction and molding

[0052] The precursor / graphene oxide composite powder was placed in a tube furnace and heat-treated under a nitrogen atmosphere. The reaction conditions were as follows: the temperature was increased from room temperature to 900°C at a rate of 5°C / min. The temperature was then maintained at 900°C for 2 h to allow boric acid and urea to react, generating boron nitride that coats the graphene oxide template. During the reaction, urea decomposed to produce ammonia, which reacted with boric acid to form boron nitride (BN). The nitrogen flow rate was 100 sccm (standard milliliters per minute) to ensure an inert environment and remove reaction byproducts, yielding a boron nitride / graphene oxide composite, wherein the boron nitride forms a nanosheet structure covering the graphene oxide surface.

[0053] (3) Template removal

[0054] The boron nitride / graphene oxide composite was placed in air at 650°C for 1 h to remove the graphene sheet and obtain boron nitride nanosheets with a thickness of 1 nm to 100 nm and a diameter of 50 μm.

[0055] By changing the sheet diameter of the template material, boron nitride nanosheets with sheet diameters of 10 μm to 100 μm can be obtained.

[0056] Example 2

[0057] This embodiment provides a method for preparing a directional thermal conductivity agent, taking titanium dioxide as an example, as follows:

[0058] (1) Mixing and adhesion of template material and precursor

[0059] Preparation of mica dispersion: 100 mg of mechanically ground mica powder (60 μm in diameter) was added to 500 mL of deionized water and sonicated for 2 h to form a uniform mica flake dispersion.

[0060] Preparation of precursor solution: Titanium tetrachloride (1.0 g) was dissolved in 100 mL of deionized water and stirred (magnetic stirring, 500 rpm) to form precursor solution.

[0061] (2) Reaction and molding

[0062] The mica dispersion was heated and stirred in a water bath at 80℃-90℃, and the precursor solution was added dropwise while maintaining the pH between 1 and 3 using dilute hydrochloric acid. After the addition was complete, the reaction continued for 2-4 hours to ensure that hydrated titanium dioxide was fully formed and uniformly adsorbed on the mica surface. The mixture was then transferred to a high-pressure reactor and subjected to a hydrothermal reaction at 150℃.

[0063] (3) Template removal

[0064] Mica components were etched in hydrofluoric acid to selectively remove the mica template. The mica was then washed with deionized water by centrifugation to remove hydrofluoric acid and other impurities until the washing solution was neutral. Finally, the nanosheets were dried at 80°C to obtain titanium dioxide nanosheets with a thickness of 1 nm to 100 nm and a diameter of 60 μm.

[0065] By changing the sheet diameter of the template material, titanium dioxide nanosheets with sheet diameters of 10 μm to 100 μm can be obtained.

[0066] Example 3

[0067] This embodiment provides a method for preparing a thermal management material, as detailed below:

[0068] (1) Slurry preparation and dispersion

[0069] In a mechanically stirred reactor, 20 parts of ethanol, 5 parts of sodium dodecylbenzenesulfonate, 60 parts of nano-silica, 10 parts of basalt fiber, and 25 parts of the directional thermal conductive agent (50 μm in diameter) prepared in Example 1 were added sequentially. The mixture was stirred at 500 rpm for 10 min, and then 5 parts of water glass were slowly added dropwise. The stirring speed was reduced to 800 rpm, and the mixture was stirred for another 10 min to ensure uniform mixing. The reactor was then sealed, and a vacuum pump was turned on to remove air bubbles from the slurry at 300 rpm. The mixture was stirred for 10 min to obtain a uniform slurry with suitable viscosity.

[0070] (2) Flowing and winding

[0071] The degassed slurry is transferred to the casting machine's trough. The slit height between the scraper and the base belt is adjusted to 20 μm. The base belt carrying the slurry enters the mild evaporation, rapid evaporation, cooling and shaping, and drying stages. The dried film is peeled off from the base belt and wound up to obtain a single-layer film with an orientation structure and a thickness of approximately 18 μm.

[0072] (3) Lamination and hot pressing

[0073] The single-layer film is cut into sheets of the required size and stacked 100 layers. The stack is then placed in a flat mold of a hot press. A pressure of 5 MPa is applied at 200°C and held for 15 minutes to obtain the thermal management material.

[0074] Example 4

[0075] This embodiment provides a method for preparing a thermal management material, as detailed below:

[0076] (1) Slurry preparation and dispersion

[0077] In a mechanically stirred reactor, 20 parts of n-butanol, 5 parts of sodium dodecylbenzenesulfonate, 60 parts of nano-silica, 10 parts of silicon carbide fiber, and 25 parts of the directional thermal conductive agent (60 μm in diameter) prepared in Example 2 were added sequentially. The mixture was stirred at 500 rpm for 10 min, and then 5 parts of water glass were slowly added dropwise. The stirring speed was reduced to 800 rpm, and the mixture was stirred for another 10 min to ensure uniform mixing. The reactor was then sealed, and a vacuum pump was turned on to remove air bubbles from the slurry at 300 rpm. The mixture was stirred for 10 min to obtain a uniform slurry with suitable viscosity.

[0078] (2) Flowing and winding

[0079] The degassed slurry is transferred to the casting machine's trough. The slit height between the scraper and the base belt is adjusted to 30 μm. The base belt carrying the slurry enters the mild evaporation, rapid evaporation, cooling and shaping, and drying stages. The dried film is peeled off from the base belt and wound up to obtain a single-layer film with an orientation structure and a thickness of approximately 27 μm.

[0080] (3) Lamination and hot pressing

[0081] The single-layer film is cut into sheets of the required size and stacked into 67 layers. The stack is then placed in a flat mold of a hot press. A pressure of 10 MPa is applied at 200°C and held for 10 minutes to obtain the thermal management material.

[0082] Example 5

[0083] This embodiment provides a method for preparing a thermal management material, as detailed below:

[0084] (1) Slurry preparation and dispersion

[0085] In a mechanically stirred reactor, 15 parts of isopropanol, 5 parts of sodium dodecylbenzenesulfonate, 70 parts of nano-silica, 10 parts of silicon carbide fiber, and 30 parts of the directional thermal conductive agent (50 μm in diameter) prepared in Example 1 were added sequentially. The mixture was stirred at 500 rpm for 10 min, and 5 parts of water glass were slowly added dropwise. The stirring speed was then reduced to 800 rpm, and the mixture was stirred for another 10 min to ensure uniform mixing. The reactor was then sealed, and a vacuum pump was turned on to remove air bubbles from the slurry at 300 rpm. The mixture was stirred for 10 min to obtain a uniform slurry with suitable viscosity.

[0086] (2) Flowing and winding

[0087] The degassed slurry is transferred to the casting machine's trough. The slit height between the scraper and the base belt is adjusted to 25 μm. The base belt carrying the slurry enters the mild evaporation, rapid evaporation, cooling and shaping, and drying stages. The dried film is peeled off from the base belt and wound up to obtain a single-layer film with an orientation structure and a thickness of approximately 22 μm.

[0088] (3) Lamination and hot pressing

[0089] The single-layer film is cut into sheets of the required specifications and stacked into 82 layers. The stack is then placed in a flat mold of a hot press. A pressure of 10 MPa is applied at 200°C and held for 10 minutes to obtain the thermal management material.

[0090] Comparative Example 1

[0091] This comparative example provides a method for preparing a thermal management material, similar to Example 3, except that it is directly pressed into shape. Specifically, the slurry obtained in step (1) is placed in a mold, dried at 200°C for 30 min, and then directly pressed to obtain the thermal management material.

[0092] Comparative Example 2

[0093] This comparative example provides a method for preparing a thermal management material, similar to Example 3, except that the preparation method of the thermal conductive agent is different. A conventional method is used, specifically: boric acid (1.0 g) and urea (3.0 g) are heat-treated under a nitrogen atmosphere. The reaction conditions are as follows: the temperature is increased from room temperature to 900°C at a rate of 5°C / min. The temperature is then maintained at 900°C for 2 h to allow the boric acid and urea to react and generate boron nitride.

[0094] Comparative Example 3

[0095] This comparative example provides a method for preparing a thermal management material, similar to Example 3, except that the diameter of the directional thermal conductive agent used is 10 μm.

[0096] In this comparative example, the diameter of the directional thermal conductive agent flakes is smaller than the thickness of the single-layer film.

[0097] Performance characterization:

[0098] The thermal conductivity of the thermal management material in the vertical and parallel directions at 800℃ was measured using the heat flow meter method according to GB10295-88; the testing equipment was the Xiangtan Xiangke DRL-III thermal conductivity meter. The results are shown in Table 1:

[0099] Table 1. Thermal conductivity of the examples and comparative examples

[0100]

[0101] As shown in Table 1, Examples 3-5 exhibit extremely low thermal conductivity in the vertical direction, significantly lower than Comparative Examples 1-3; however, their thermal conductivity in the parallel direction is much higher than that of Comparative Examples 1-3. This is because Examples 3-5 utilize a unique internal structure formed by directional thermal conductive agents and a single-layer film lamination and pressing method to prepare the thermal management materials. When heat attempts to pass vertically through the plate, it must continuously penetrate countless parallel-arranged sheet-like directional thermal conductive agents, minimizing heat loss and ensuring excellent thermal insulation in the vertical direction. In the parallel direction, heat can propagate directionally through parallel channels between the layers, encountering far less resistance than in the vertical direction, resulting in good heat dissipation in the parallel direction.

[0102] Comparative Example 1 was directly pressed into shape. Although it used the same directional thermal conductive agent as Example 3, it could not guarantee the direction of the directional thermal conductive agent, which resulted in poor thermal insulation and no heat dissipation.

[0103] Comparative Example 2 did not use a directional thermal conductive agent and did not have heat dissipation in the parallel direction. However, the thermal management material prepared by stacking and pressing a single-layer thin film made its thermal insulation performance slightly better than that of Comparative Example 1, but still far worse than that of Examples 3-5.

[0104] Although Comparative Example 3 used a directional thermal conductive agent, its sheet diameter was smaller than the thickness of the prepared monolayer film, so it was not oriented during the preparation of the monolayer film. Therefore, it did not have heat dissipation in the parallel direction, and its thermal insulation performance was far worse than that of Examples 3-5.

[0105] Examples 3-5 are applied to automotive battery packs (such as...) Figure 1 When the battery is in operation, its low thermal conductivity in the vertical direction allows it to achieve extreme thermal insulation to prevent the spread of thermal runaway. At the same time, its good thermal conductivity in the horizontal direction allows the battery to dissipate heat in a timely manner during operation to ensure the uniformity of the battery temperature.

[0106] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the scope of protection of this invention.

Claims

1. An anisotropic thermal management material, characterized in that, The raw materials of the anisotropic thermal management material, by weight, include the following components: 50-90 parts of nano-silica, 1-15 parts of reinforcing fiber, 10-35 parts of directional thermal conductivity agent, 10-30 parts of organic solvent, 1-10 parts of binder, and 1-10 parts of dispersant. The anisotropic thermal management material is obtained by laminating and hot-pressing single-layer thin films with an oriented structure. The single-layer film with an oriented structure is obtained by mixing the raw materials of the anisotropic thermal management material, spreading it with a doctor blade, evaporating it, cooling it to set it, and drying it.

2. The anisotropic thermal management material according to claim 1, characterized in that, The directional thermal conductive agent has a sheet-like structure; the thickness of the sheet-like structure is 1 nm to 100 nm; and the sheet diameter is 10 μm to 100 μm. And / or, the directional thermal conductive agent is one or more of silicon carbide, titanium dioxide, carbon black, zirconium oxide, zirconium silicate, potassium titanate, tin oxide, zinc oxide, cerium oxide, iron oxide, manganese dioxide, vanadium dioxide, cobalt oxide, tungsten oxide, chromium oxide, molybdenum disulfide, boron nitride, and boron carbide.

3. The anisotropic thermal management material according to claim 1, characterized in that, The particle size of the nano-silica is 5 nm to 100 nm.

4. The anisotropic thermal management material according to claim 1, characterized in that, The thickness of the single-layer film with the oriented structure is 10 μm to 100 μm, and the thickness of the single-layer film is smaller than the diameter of the oriented thermal conductive agent.

5. The anisotropic thermal management material according to claim 1, characterized in that, The number of layers in the flat tiling stack is 20 to 250.

6. The anisotropic thermal management material according to claim 1, characterized in that, The pressure of the hot pressing is 0.1 MPa to 15 MPa; And / or, the temperature of the hot pressing is 25 ℃ to 300 ℃; And / or, the hot pressing time is 10 s to 120 min.

7. The anisotropic thermal management material according to claim 1, characterized in that, The reinforcing fiber is one or more of the following: quartz fiber, mullite fiber, basalt fiber, alumina fiber, zirconium oxide fiber, silicon oxide fiber, silicon nitride fiber, silicon carbide fiber, and glass fiber. And / or, the organic solvent is one or more of ethanol, n-butanol, tert-butanol, dipropylene glycol, diethylene glycol diethyl ether, diethylene glycol butyl ether, terpineol, isopropanol, and twelfth alcohol ester.

8. The anisotropic thermal management material according to claim 1, characterized in that, The adhesive is one or more of the following: silicone resin, epoxy resin, phenolic resin, polyurethane resin, acrylic resin, alkyd resin, polyester resin, polyvinyl alcohol, water glass, aluminum sol, and silica sol. And / or, the dispersant is one or more of sodium stearate, sodium lauryl sulfonate, sodium dodecylbenzene sulfonate formaldehyde condensate, sodium tripolyphosphate, potassium pyrophosphate, polyethylene glycol, polypropylene glycol, fatty alcohol polyoxyethylene ether, Span series, Tween series, hexadecyltrimethylammonium bromide, dodecyl dimethyl benzyl ammonium chloride, and fatty amine polyoxyethylene ether.

9. A method for preparing the anisotropic thermal management material according to any one of claims 1-8, characterized in that, Includes the following steps: S1. Add nano-silica, reinforcing fibers, directional thermal conductivity agent and dispersant to organic solvent, disperse and mix thoroughly, then add binder and mix evenly to obtain slurry; S2. The slurry obtained in step S1 is spread onto the base belt by the doctor blade of the casting machine, and a single-layer film with an oriented structure is obtained by evaporation, cooling and shaping and drying. S3. The single-layer film obtained in step S2 is laid flat and stacked, and then hot-pressed to obtain the anisotropic thermal management material.

10. The use of the anisotropic thermal management material according to any one of claims 1-8 in an automotive battery pack.

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