A heat-insulating material, its preparation method and application

Abstract

The present invention provides a heat-insulating material, a preparation method thereof and an application. The heat-insulating material includes a first mica layer, a first adhesive layer, a fiber layer, a second adhesive layer and a second mica layer arranged in sequence. The first mica layer and the second mica layer can protect against the heat generated during thermal runaway and block heat. The fiber layer further improves the protective ability of the impact strength between the protective components among the modules and the battery cells. The material is lightweight, can effectively reduce the weight of the battery pack, can effectively protect against the combustion problem caused by the collision of the battery cells, thereby ensuring the safety of the surrounding battery modules and the entire vehicle, and can fully meet the application requirements in the battery cells and modules.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy materials, and particularly relates to a heat insulation material, a preparation method thereof, and an application thereof. Background Art

[0002] With the increasing popularity of new energy vehicles, the application of power batteries is becoming more and more extensive. Correspondingly, the safety of power batteries has attracted more and more attention from society. When the battery cell collides or undergoes thermal runaway, due to its own structure and composition, it is prone to combustion or explosion, resulting in the failure of the battery and the whole vehicle, and bringing potential safety hazards.

[0003] CN114361740A discloses a low thermal conductivity mica composite with thermal runaway protection applied between battery cells, which includes a porous heat insulation material layer as the core layer and composite mica sheets laminated on the upper and lower surfaces of the porous heat insulation material layer; a reinforcing mesh cloth is hot-pressed and laminated on the surface of the composite mica sheet; the composite mica sheet is prepared from the following raw materials: a surface-modified compound mica composition, a diluting solvent, a toughening filler, a low thermal conductivity filler, an organosilicon resin, and a coupling agent; the toughening filler is a mixture of aromatic polyamide fiber filaments, alumina fibers, and silicon carbide whiskers; the low thermal conductivity filler is a mixture of carbon fluororesin powder, inorganic hollow microspheres, and zirconia, which has good heat insulation and flame retardant properties. When used between battery cells, it can ensure good thermal runaway protection performance and improve the use safety of new energy vehicle batteries, but it cannot effectively prevent the technical problem of potential safety hazards caused by collisions.

[0004] CN115799768A relates to a battery module and a vehicle. The battery module includes: a battery cell, including a battery cell body and a battery cell pole provided on the battery cell body, and the battery cell pole is formed with a first insertion portion; a battery connection piece, formed with a second insertion portion corresponding to the first insertion portion, and the second insertion portion can be inserted and matched with the first insertion portion, so that a plurality of battery cells can be electrically connected through the battery connection piece, and the second insertion portion can be detached from the first insertion portion for the repair and replacement of the battery cell and / or the battery connection piece. The battery module disclosed in the above technical solution realizes the electrical connection of a plurality of battery cells by the insertion and matching of the first insertion portion of the battery cell pole and the second insertion portion of the battery connection piece. Moreover, through the insertion connection method, it can also be conveniently disassembled, has high repairability, simple assembly, and low comprehensive cost, but its heat insulation performance is poor and it cannot meet the use requirements under high temperature conditions.

[0005] CN115863890A discloses a soft-pack battery module, including a fixing frame, a housing and a cell support member; the fixing frame includes a housing connection part, a cell accommodation cavity and a lifting lug plate, and a support plate nut is provided on the housing connection part; several single cells are arranged in sequence in the cell accommodation cavity, and a foam partition is provided between adjacent cells; the cell support member is a foam support block with a C-shaped structure; the housing includes a bottom plate, and enclosing plates are provided on three adjacent side surfaces on the upper surface of the bottom plate, and a side cover plate is detachably installed on the other side surface; a partition is provided in the space enclosed by the enclosing plate and the side cover plate, and the partition divides the space enclosed by the enclosing plate and the side cover plate into a battery compartment and a battery management compartment; an upper cover plate is installed on the upper surfaces of the enclosing plate and the side cover plate. The fixing frame in this soft-pack battery module can resist the expansion force generated by the expansion and deformation of the soft-pack battery module, and the housing has good heat insulation performance and can adapt to the relatively low temperature environment in the adjacent space. However, its protection effect is poor and it cannot effectively prevent potential safety hazards caused by collisions.

[0006] Most of the protection devices in the prior art are structures similar to protective shells sleeved outside the battery module. This type of protection device generally has a general protection effect, cannot effectively insulate heat and prevent potential safety hazards caused by collisions, and cannot effectively insulate and protect between the cells in the module. Therefore, developing a material with good heat insulation performance and excellent protection performance is an urgent problem to be solved in this field. Summary of the Invention

[0007] Aiming at the deficiencies of the prior art, the purpose of the present invention is to provide a heat insulation material, its preparation method and application. The heat insulation material includes a first mica layer, a first adhesive layer, a fiber layer, a second adhesive layer and a second mica layer arranged in sequence. Through the design of each layer of material and the multiple interactions between components, the material is given excellent heat insulation performance and protection performance, and can fully meet the application in cells and modules.

[0008] To achieve the purpose of this invention, the present invention adopts the following technical solutions:

[0009] In the first aspect, the present invention provides a heat insulation material, which includes a first mica layer, a first adhesive layer, a fiber layer, a second adhesive layer and a second mica layer arranged in sequence.

[0010] In the heat insulation material provided by the present invention, from the outside to the inside, it includes a first mica layer, a first adhesive layer, a fiber layer, a second adhesive layer and a second mica layer arranged in sequence. The first mica layer and the second mica layer can protect against battery cross-burning caused by thermal runaway and block heat. The fiber layer further improves the protection ability of the impact strength between the protection components between the modules and the cells. The material is lightweight and can effectively protect against the combustion problem caused by the collision of the cells, thereby ensuring the safety of the surrounding battery modules and the whole vehicle.

[0011] Preferably, the thickness of the heat insulation material is 1.5 - 3 mm, for example, it can be 1.5 mm, 1.8 mm, 2 mm, 2.2 mm, 2.5 mm, 2.8 mm, 3 mm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the range.

[0012] Five - layer structures form a group, and the number of groups can be increased according to the thickness requirement to meet the spacing requirements between battery cells, within a module or between modules, thereby effectively achieving heat insulation and safety protection.

[0013] Preferably, the first mica layer includes a combination of phlogopite layer and muscovite layer.

[0014] Preferably, the phlogopite layer is close to the first adhesive layer.

[0015] Preferably, the thickness of the first mica layer is 0.1 - 0.5 mm, for example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the range.

[0016] Preferably, the mass ratio of the phlogopite layer to the muscovite layer is (1 - 5):1, for example, it can be 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the range.

[0017] Preferably, the first mica layer is compounded with a mass ratio of phlogopite layer to muscovite layer of 2:1, effectively increasing the flexibility of the material.

[0018] Preferably, the first adhesive layer and the second adhesive layer are each independently an epoxy resin adhesive layer.

[0019] Preferably, the thicknesses of the first adhesive layer and the second adhesive layer are each independently 0.05 - 0.2 mm, for example, it can be 0.05 mm, 0.07 mm, 0.09 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the range.

[0020] Preferably, the epoxy resin adhesive layer includes bisphenol A epoxy resin.

[0021] Preferably, the bisphenol A epoxy resin includes epoxy resin E128 and / or epoxy resin E644.

[0022] Preferably, the epoxy resin adhesive layer is prepared by mixing epoxy resin and diluent in a ratio of 1:(1.1 - 1.5) (for example, it can be 1:1.1, 1:1.2, 1:1.3, 1:1.4, 1:1.5, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope), and used after high-speed stirring for 0.5 h.

[0023] Preferably, the diluent is toluene and / or methanol.

[0024] Preferably, the spraying thickness of the epoxy resin adhesive layer is 0.05 - 0.2 mm. For example, it can be 0.05 mm, 0.07 mm, 0.09 mm, 0.1 mm, 0.12 mm, 0.14 mm, 0.15 mm, 0.16 mm, 0.18 mm, 0.2 mm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0025] Preferably, the thickness of the fiber layer is 0.1 - 0.5 mm. For example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0026] Preferably, the fiber layer is a carbon fiber mesh layer or a carbon fiber cloth layer.

[0027] Preferably, the carbon fiber mesh and the carbon fiber cloth are each independently obtained by processing carbon fibers.

[0028] Preferably, the diameter of the carbon fiber is 6 - 10 μm. For example, it can be 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0029] Preferably, the length of the carbon fiber is 100 - 200 μm. For example, it can be 100 μm, 110 μm, 120 μm, 130 μm, 140 μm, 150 μm, 160 μm, 170 μm, 180 μm, 190 μm, 200 μm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0030] Preferably, the second mica layer is a combination of a phlogopite layer and a muscovite layer.

[0031] Preferably, the phlogopite layer is close to the second adhesive layer.

[0032] Preferably, the thickness of the second mica layer is 0.1 - 0.5 mm, for example, it can be 0.1 mm, 0.15 mm, 0.2 mm, 0.25 mm, 0.3 mm, 0.35 mm, 0.4 mm, 0.45 mm, 0.5 mm, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0033] Preferably, the mass ratio of the phlogopite layer to the muscovite layer is (1 - 5):1, for example, it can be 1:1, 1.5:1, 2:1, 2.5:1, 3:1, 3.5:1, 4:1, 4.5:1, 5:1, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0034] Preferably, the first mica layer is compounded with a mass ratio of phlogopite layer to muscovite layer of 2:1, effectively increasing the flexibility of the material.

[0035] In a second aspect, the present invention provides a method for preparing the heat insulation material as described in the first aspect, comprising the following steps:

[0036] The first adhesive layer, the fiber layer, the second adhesive layer, and the second mica layer are sequentially arranged on the first mica layer to obtain the heat insulation material;

[0037] Preferably, an adhesive is applied to one side of the first mica layer to form the first adhesive layer; the first adhesive layer is compounded and bonded with the fiber layer; after pre-curing, an adhesive is applied to the other side of the fiber layer to form the second adhesive layer, and then it is compounded with the second mica layer, and after hot pressing and curing, the heat insulation material is obtained.

[0038] Preferably, the temperature of the pre-curing is 120 - 140 °C, for example, it can be 120 °C, 125 °C, 130 °C, 135 °C, 140 °C, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0039] Preferably, the pressure of the pre-curing is 400 - 600 T, for example, it can be 400 T, 450 T, 500 T, 550 T, 600 T, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention does not exhaustively list the specific point values included in the scope.

[0040] Preferably, the pre-curing time is 0.5 - 1 h, for example, it can be 0.5 h, 0.6 h, 0.7 h, 0.8 h, 0.9 h, 1 h, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention will not exhaustively list the specific point values included in the above range.

[0041] Preferably, the pressure for hot pressing and curing is 400 - 600 T, for example, it can be 400 T, 450 T, 500 T, 550 T, 600 T, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention will not exhaustively list the specific point values included in the above range.

[0042] Preferably, the temperature for hot pressing and curing is 160 - 200 °C, for example, it can be 160 °C, 170 °C, 180 °C, 190 °C, 200 °C, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention will not exhaustively list the specific point values included in the above range.

[0043] Preferably, the time for hot pressing and curing is 0.5 - 2 h, for example, it can be 0.5 h, 0.8 h, 1 h, 1.2 h, 1.5 h, 1.8 h, 2 h, and specific point values between the above point values. Due to space limitations and for the sake of simplicity, the present invention will not exhaustively list the specific point values included in the above range.

[0044] In the third aspect, the present invention provides an application of the heat insulation material in a battery cell and a module.

[0045] The heat insulation material of the present invention is embedded in the gaps between modules and battery cells, which can absorb the impact force between battery cells, keep the battery cells and the modules in close contact all the time, make the structure of the battery module stable, and at the same time can prevent the fluid ejected from a thermally out-of-control battery cell from igniting adjacent battery cell units, thereby improving the safety performance of the entire battery module.

[0046] Compared with the prior art, the present invention has the following beneficial effects:

[0047] The heat insulation material provided by the present invention is sequentially provided with a first mica layer, a first adhesive layer, a fiber layer, a second adhesive layer and a second mica layer. The first mica layer and the second mica layer can prevent the battery from catching fire in series and block heat under the thermally out-of-control state, and the heat insulation temperature can reach 700 °C. When the heating surface is heated to 1000 °C, the unheated cold surface on the other side will remain below 300 °C; the flame retardant performance reaches V0. The fiber layer further improves the protection ability of the impact strength between the protection components between modules and battery cells, and the impact strength can reach ≥20 KJ / m 2, the flexural strength can reach ≥200 MPa. The material is lightweight, which can effectively reduce the weight of the battery pack, and can effectively protect the battery core from combustion problems caused by collisions, thereby ensuring the safety of the surrounding battery modules and the entire vehicle, and can fully meet the applications in the battery core and modules. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 FIG. 6 is a schematic structural diagram of the heat insulation material provided in Embodiment 1 of the present invention.

[0049] Among them, 1 - the first mica layer, 2 - the first adhesive layer, 3 - the fiber layer, 4 - the second adhesive layer, 5 - the second mica layer. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0050] The technical solution of the present invention will be further described below through specific embodiments. Those skilled in the art should understand that the embodiments are only for helping to understand the present invention and should not be construed as specific limitations on the present invention.

[0051] Embodiment 1

[0052] This embodiment provides a heat insulation material, and the schematic diagram of the heat insulation material is as Figure 1 described. The first mica layer 1 (with a thickness of 0.2 mm) disposed on the outer surface (the first mica layer 1 includes a phlogopite layer and a muscovite layer, and the mass ratio of the phlogopite layer to the muscovite layer is 2:1, and the phlogopite layer is close to the first adhesive layer 2) is bonded to the fiber layer 3 (with a thickness of 0.3 mm) through the first adhesive layer 2 (with a thickness of 0.1 mm), and through the second adhesive layer 4 (with a thickness of 0.1 mm), the second mica layer 5 (with a thickness of 0.2 mm, the second mica layer 5 includes a phlogopite layer and a muscovite layer, and the mass ratio of the phlogopite layer to the muscovite layer is 2:1, and the phlogopite layer is close to the second adhesive layer 4) is bonded.

[0053] The preparation method of the heat insulation material includes the following steps:

[0054] The first mica layer 1 (with a thickness of 0.2 mm) is first subjected to the first gluing through a laminating machine to form the first adhesive layer 2 (with a thickness of 0.1 mm). After pre-curing at a temperature of 130 °C, a pressure of 500 T, and a curing time of 0.5 h, the second gluing (130 °C, 500 T) is carried out on the other side of the fiber layer 3 to form the second adhesive layer 4 (with a thickness of 0.1 mm) to bond the second mica layer 5 (with a thickness of 0.2 mm), and hot pressing and curing are carried out at a pressure of 600 T and 180 °C for 1.5 h to obtain the heat insulation material.

[0055] Embodiment 2

[0056] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the total thickness of the first mica layer is kept unchanged and the mica layer is only a single phlogopite layer; other hierarchical structures, materials, thicknesses and preparation methods are the same as those in Embodiment 1.

[0057] Embodiment 3

[0058] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the total thickness of the first mica layer is kept unchanged and the mica layer is only a single muscovite layer; other hierarchical structures, materials, thicknesses and preparation methods are the same as those in Embodiment 1.

[0059] Embodiment 4

[0060] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the total thickness of the first mica layer is kept unchanged and the mass ratio of the phlogopite layer to the muscovite layer is 4:1; other hierarchical structures, materials, thicknesses and preparation methods are the same as those in Embodiment 1.

[0061] Embodiment 5

[0062] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the thicknesses of the first mica layer and the second mica layer are 0.5 mm; other hierarchical structures, materials, thicknesses and preparation methods are the same as those in Embodiment 1.

[0063] Embodiment 6

[0064] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the total thickness of the first mica layer is kept unchanged and the mass ratio of the phlogopite layer to the muscovite layer is 1:3; other hierarchical structures, materials, thicknesses and preparation methods are the same as those in Embodiment 1.

[0065] Embodiment 7

[0066] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the pre-curing temperature is 110 °C, the pre-curing pressure is 300 T, and the pre-curing time is 0.5 h; other hierarchical structures, materials, thicknesses and preparation methods are the same as those in Embodiment 1.

[0067] Embodiment 8

[0068] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the pre-curing temperature is 180 °C, the pre-curing pressure is 700 T, and the pre-curing time is 2 h; other hierarchical structures, materials, thicknesses and preparation methods are the same as those in Embodiment 1.

[0069] Embodiment 9

[0070] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the total thickness of the second mica layer is kept unchanged, and the mass ratio of the phlogopite layer to the muscovite layer in the second mica layer is 1:3; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those in Embodiment 1.

[0071] Embodiment 10

[0072] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the total thickness of the second mica layer is kept unchanged, and the mica layer is only a single phlogopite layer; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those in Embodiment 1.

[0073] Embodiment 11

[0074] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the thicknesses of the first mica layer and the second mica layer are changed to 1 mm; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those in Embodiment 1.

[0075] Embodiment 12

[0076] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the thickness of the first mica layer is changed to 0.02 mm and the thickness of the second mica layer is changed to 0.02 mm; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those in Embodiment 1.

[0077] Embodiment 13

[0078] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the thicknesses of the first bonding layer and the second bonding layer are changed to 0.01 mm; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those in Embodiment 1.

[0079] Embodiment 14

[0080] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the thicknesses of the first bonding layer and the second bonding layer are changed to 0.5 mm; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those in Embodiment 1.

[0081] Embodiment 15

[0082] This embodiment provides a heat-insulating material, the difference from Embodiment 1 being only that the thickness of the fiber layer is changed to 0.02 mm; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those in Embodiment 1.

[0083] Embodiment 16

[0084] This embodiment provides a heat-insulating material, which is only different from that of Embodiment 1 in that the thickness of the fiber layer is changed to 0.5 mm; the other hierarchical structures, materials, thicknesses, and preparation methods are the same as those of Embodiment 1.

[0085] Comparative Example 1

[0086] This comparative example provides a heat-insulating material, which successively sets a first mica layer, a first bonding layer, and a fiber layer, and the preparation method is the same as that of Embodiment 1.

[0087] Comparative Example 2

[0088] This comparative example provides a heat-insulating material, which is only different from that of Embodiment 1 in that the fiber layer uses a glass fiber material; the types, dosages, and preparation methods of other components are the same as those of Embodiment 1.

[0089] Comparative Example 3

[0090] This comparative example provides a heat-insulating material, which is only different from that of Embodiment 1 in that the heat-insulating material has no fiber layer; the types, dosages, and preparation methods of other components are the same as those of Embodiment 1.

[0091] Perform performance tests on the heat-insulating materials provided in Embodiments 1-16 and Comparative Examples 1-3. The specific method is as follows:

[0092] (1) Heat-insulating temperature: Use a high-temperature thermocouple device to conduct upper and lower heat-insulating tests on the material. The heating surface temperature is 1000 °C, and the cold surface temperature is maintained at 300 °C.

[0093] (2) Flame retardancy: Use a horizontal and vertical burning tester model HZ-1717E to test vertical burning.

[0094] (3) Impact strength: Test using a Tian's Ousen plastic impact tester model IT504.

[0095] (4) Bending strength: Test using a high and low temperature universal material testing machine model QJ211B-30KN.

[0096] The test results are as shown in Table 1.

[0097] Table 1

[0098]

[0099]

[0100] From the data in Table 1, it can be seen that the heat-insulating temperature of the heat-insulating materials obtained in Embodiments 1-16 of the present invention is 350-768 °C / mm, and the impact strength is 12.5-34.5 KJ / m 2, the flexural strength is 137 - 345 MPa. The flexural strength of Comparative Example 1 is low, the flexural strength and impact strength of Comparative Example 2 are low, and the impact strength and flexural strength of Comparative Example 3 are relatively low.

[0101] The applicant declares that the process method of the present invention is illustrated by the above embodiments, but the present invention is not limited to the above process steps, that is, it does not mean that the present invention must rely on the above process steps to be implemented. Those skilled in the art should understand that any improvement to the present invention, the equivalent substitution of the raw materials selected for the present invention, the addition of auxiliary components, the selection of specific methods, etc. all fall within the protection scope and the disclosure scope of the present invention.

Claims

1. A heat insulation material applied in battery cells and modules, characterized in that, The heat insulation material includes a first mica layer, a first adhesive layer, a fiber layer, a second adhesive layer, and a second mica layer which are arranged in sequence; The first mica layer is a combination of a phlogopite layer and a muscovite layer; The second mica layer is a combination of a phlogopite layer and a muscovite layer; The fiber layer is a carbon fiber mesh layer or a carbon fiber cloth layer; The heat insulation material is prepared by the following method, and the method includes the following steps: Apply glue on one side of the first mica layer to form a first adhesive layer; compound and bond the first adhesive layer with the fiber layer; after pre-curing, apply glue on the other side of the fiber layer to form a second adhesive layer, and then compound it with the second mica layer, and perform hot press curing to obtain the heat insulation material; The temperature of the pre-curing is 120-140°C; The pressure of the pre-curing is 400-600T; The time of the pre-curing is 0.5-1h.

2. The heat insulation material according to claim 1, characterized in that, The thickness of the heat insulation material is 0.5-5mm.

3. The heat-insulating material according to claim 1, wherein, In the first mica layer, the phlogopite layer is close to the first adhesive layer.

4. The heat insulation material according to claim 1, characterized in that, The thickness of the first mica layer is 0.1-0.5mm.

5. The heat insulation material according to claim 1, characterized in that, In the first mica layer, the mass ratio of the phlogopite layer to the muscovite layer is (1-5):

1.

6. The heat-insulating material according to claim 1, characterized in that, The first adhesive layer and the second adhesive layer are each independently an epoxy resin adhesive layer.

7. The heat-insulating material according to claim 1, characterized in that, The thicknesses of the first adhesive layer and the second adhesive layer are each independently 0.05-0.2mm.

8. The heat-insulating material according to claim 6, wherein The epoxy resin adhesive layer includes bisphenol A epoxy resin.

9. The heat insulating material according to claim 8, wherein The bisphenol A epoxy resin includes epoxy resin E128 and / or epoxy resin E644.

10. The heat-insulating material according to claim 1, characterized in that, The thickness of the fiber layer is 0.1-0.5mm.

11. The heat insulation material according to claim 1, wherein The carbon fiber mesh layer and the carbon fiber cloth layer are each independently obtained by processing carbon fibers.

12. The heat insulation material according to claim 11, wherein, The diameter of the carbon fiber is 6-10μm.

13. The heat-insulating material according to claim 11, characterized in that, The length of the carbon fiber is 100-200μm.

14. The heat-insulating material according to claim 1, wherein In the second mica layer, the phlogopite layer is close to the second adhesive layer.

15. The heat-insulating material according to claim 1, wherein The thickness of the second mica layer is 0.1-0.5mm.

16. The heat-insulating material according to claim 1, wherein In the second mica layer, the mass ratio of the phlogopite layer to the muscovite layer is (1-5):

1.

17. A method for preparing a heat-insulating material according to any one of claims 1-16, characterized in that, The preparation method includes: Apply glue on one side of the first mica layer to form a first adhesive layer; compound and bond the first adhesive layer with the fiber layer; after pre-curing, apply glue on the other side of the fiber layer to form a second adhesive layer, and then compound it with the second mica layer, and perform hot press curing to obtain the heat insulation material; The temperature of the pre-curing is 120-140°C; The pressure of the pre-curing is 400-600T; The time of the pre-curing is 0.5-1h.

18. The preparation method according to claim 17, characterized in that, The pressure of the hot press curing is 400-600T.

19. The preparation method according to claim 17, characterized in that, The temperature of the hot press curing is 160-200°C.

20. The preparation method according to claim 17, characterized in that, The time of the hot press curing is 0.5-2h.

21. Application of a heat insulation material according to any one of claims 1-16 in an electric core and a module.

Images