Preparation method of heat insulation gasket for new energy automobile battery pack

Abstract

The application discloses a preparation method of a heat insulation gasket for a new energy automobile battery pack, and comprises the following steps: washing raw materials, removing attachments on the surface of the raw materials, wherein the raw materials are composed of ceramic fibers, aluminum oxide fibers and glass fibers; putting the washed raw materials into a beater to be scattered and mixed, so that the ceramic fibers, the aluminum oxide fibers and the glass fibers in the raw materials are formed into an interlaced and uniform mixture; continuously feeding the scattered and mixed raw materials into a gasket forming machine at a constant speed to obtain a preliminarily shaped gasket product; adding hydrophilic aerogel powder to the gasket product, radiating the thickness of the gasket product by the aerogel powder, and then performing calendering by a calender roller; applying an adhesive to the gasket product and continuing to perform calendering to control the thickness; and obtaining a gasket finished product after drying. The whole product has good heat insulation effect, the heat insulation performance of the heat insulation gasket is greatly improved, and since the aerogel is radiated into the gasket, the problem of powder falling caused by the attachment of the aerogel on the surface of the product is reduced.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of thermal insulation pads, and particularly relates to a preparation method of a thermal insulation pad for a new energy automobile battery pack. BACKGROUND

[0002] At present, with the increasing popularity of electric vehicles, the safety of new energy vehicles is concerned. Most of the new energy vehicles on the market use battery modules to provide power. The battery module includes a plurality of batteries. During the driving of the automobile, the batteries are pressed and rubbed against each other due to vibration, and the situation of overheating, out of control and even fire occurs. Therefore, a thermal insulation pad needs to be arranged between adjacent batteries to separate the adjacent batteries.

[0003] At present, the thermal insulation pad for the battery pack has the following problems:

[0004] ①In the production process of the thermal insulation pad, aerogel is only attached to the surface of the product to realize the heat insulation function of the product. However, with the passage of time, the powder will fall off, thereby affecting the performance of the entire pad.

[0005] ②The thickness of the thermal insulation pad produced by the method of attaching aerogel to the surface of the product is not easy to control, and the problem of uneven thickness of the pad product will occur. In the thin place of the pad product, the anti-electric shock ability of the product is poor, which affects the use stability of the pad product in the battery pack.

[0006] ③The composition and the corresponding proportion of the pad affect the heat insulation performance of the pad.

[0007] ④The existing pad applied in the battery pack is easy to cause the transmission of combustion between adjacent batteries, and cannot better isolate the high temperature and combustion transmission of the battery during the combustion process. SUMMARY

[0008] The technical problem to be solved by the present application is to provide a preparation method of a thermal insulation pad for a new energy automobile battery pack, which has good heat insulation performance and ensures the use safety of the battery pack.

[0009] The technical solution adopted by the present application to solve the technical problem is as follows:

[0010] The preparation method of the thermal insulation pad for the new energy automobile battery pack comprises the following steps,

[0011] Step 1: washing the raw materials to remove the attachments on the surface of the raw materials. The raw materials are composed of ceramic fibers, alumina fibers and glass fibers, wherein the proportion of the ceramic fibers, the alumina fibers and the glass fibers is 1:1:2.

[0012] Second step: put the washed raw materials into the beater to disperse and mix, so that the ceramic fiber, alumina fiber and glass fiber in the raw materials are evenly mixed. The beater is operated at a speed of 600-750 rpm to disperse and mix the raw materials. Add an additive during the process to prevent the three types of fibers from clumping together.

[0013] Third step: continuously send the mixed raw materials into the gasket forming machine at a uniform speed. Adjust the distance between the preliminary forming rollers on the gasket forming machine. Press the raw materials sent into the machine through the preliminary forming rollers to form a preliminarily shaped gasket product. The thickness of the preliminarily shaped gasket product is 4.5-5.0 mm.

[0014] Fourth step: add hydrophilic aerogel powder with a particle size of 0.4-0.6 mm to the lower surface of the preliminarily shaped gasket product by spraying. Vacuumize the upper surface of the gasket product. The vacuumization creates a suction force on the hydrophilic aerogel powder sprayed on the lower surface of the gasket product, causing the powder to penetrate from the lower surface to the upper surface and radiate throughout the thickness of the gasket product. Then, roll the gasket product to control its thickness to 3.6-4.5 mm.

[0015] Fifth step: apply adhesive to the upper and lower surfaces of the gasket product without dripping. Continue to roll the gasket product to control its thickness to 3.4-4.2 mm.

[0016] Sixth step: send the gasket product into a microwave heating box to dry the inside of the product and quickly solidify and shape it. The microwave heating temperature is 50-70°C. Continue to roll the gasket product to control its thickness to 3.4-4 mm.

[0017] Seventh step: dry the gasket product by infrared heating at a temperature of 100-150°C to obtain a gasket product with a thickness of 3.4-4 mm.

[0018] In further embodiments, the ceramic fiber, alumina fiber and glass fiber each have a diameter of 1-8 μm.

[0019] The ceramic fiber has a fiber length of 6-15 mm, the alumina fiber has a fiber length of 8-25 mm, and the glass fiber has a fiber length of 12-50 mm.

[0020] In further embodiments, the additive includes inorganic additives, cationic additives and neutral ion additives.

[0021] The inorganic additive is used in an amount of 0.5%-4% of the weight of the raw material, the cationic additive is used in an amount of 0.1%-1% of the weight of the raw material, and the neutral ion additive is used in an amount of 0.1%-1% of the weight of the raw material.

[0022] In a further embodiment, the adhesive is a mixture of acrylic adhesive and vinyl acetate adhesive, and the ratio is 4:1.

[0023] In a further embodiment, aerogel is filled in the gaps among the three fibers in the raw material.

[0024] In a further embodiment, the aerogel composite ceramic fiber thermal insulation pad obtained has an aerogel bulk density of 300 kg / m 3 450 kg / m 3 The surface of the thermal insulation pad is smooth and flat.

[0025] In a further embodiment, the thermal insulation pad has a temperature resistance of 1200℃ or above.

[0026] The present application can solve the following problems:

[0027] By uniformly radiating aerogel into the pad, the entire product thickness has good thermal insulation effect. Compared with the existing aerogel attached to the surface of the product, the thermal insulation performance of the present thermal insulation pad is greatly improved. Since the aerogel is radiated into the pad, the problem of powder falling is also reduced. Since the pad is used for thermal insulation between batteries, if the problem of powder falling occurs, not only the thermal insulation ability of the pad is reduced, but also the environment used by the battery is polluted, which further reduces the safety of the battery itself.

[0028] The raw material is ceramic fiber, alumina fiber and glass fiber, and the ratio is 1:1:2. The aerogel is radiated into the product, and the thickness of the product is gradually controlled, so that the thickness of the thermal insulation pad can be gradually reduced, the overall forming thickness of the pad can be easily controlled, and the overall thickness is more uniform. The uneven thickness of the product will not cause uneven and unstable overall anti-electric shock ability. The ceramic fiber and alumina fiber are used in a ratio of 1:1, so that the distribution of the thermal insulation fibers in the product is balanced, and the smoothness and flatness of the product are enhanced.

[0029] In addition, by using ceramic fiber, alumina fiber and glass fiber in a ratio of 1:1:2, the ceramic fiber and alumina fiber improve the thermal insulation effect of the product, and the glass fiber can play a reinforcing role, which can increase the strength of the product by more than 40%. Therefore, through the combination of the three fibers and aerogel, the thermal insulation performance and overall strength of the thermal insulation pad are ensured.

[0030] Furthermore, since the raw material uses fibers and the fibers form non-directional interweaving in the product, the fibers are in all directions, when the cushion is used in the environment of the battery pack and combustion occurs, the heat is transferred along the fibers, and the fibers are not perpendicular to the combustion surface, in addition, the fibers are also overlapped with each other, thereby increasing the thermal resistance of the product, reducing the temperature to 600℃, avoiding the remaining adjacent materials reaching the ignition point, and improving the safety of the product, and there is no problem of combustion transmission.

[0031] The aerogel composite ceramic fiber heat insulation cushion made by the preparation method contains aerogel with a bulk density of 300-450kg / m 3 , so as to achieve good heat insulation effect and durability, the thermal conductivity can be reduced from 0.035W / (m·K) to 0.023W / (m·K), and the aerogel powder is distributed in the fiber pad body, greatly reducing the generation of powder falling phenomenon, prolonging the service life of the product and ensuring the performance of the product. The raw material composed of ceramic fiber, alumina fiber and glass fiber can also enhance the strength of the heat insulation cushion and improve the safety, so as to avoid the heat insulation cushion becoming brittle and powdering under long-term work. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is a micrograph of a cushion product in the prior art after high temperature treatment;

[0033] Figure 2 It is a micrograph of another cushion product in the prior art after high temperature treatment;

[0034] Figure 3 It is a micrograph of a cushion product prepared by the present application after high temperature treatment; DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme of the embodiments of the present application will be described clearly and completely below in combination with the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all the embodiments. Based on the described embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor belong to the scope of protection of the present application.

[0036] Unless otherwise defined, all technical and scientific terms used in the present application have the same meaning as commonly understood by one of ordinary skill in the art to which the present application belongs; the terms used in the specification of the present application are only for the purpose of describing the specific embodiments of the present application, not intended to limit the present application; the terms "include" and "have" in the specification and claims of the present application, and any variations thereof, are intended to cover non-exclusive inclusion.

[0037] The application discloses a preparation method of a heat insulation gasket for a new energy automobile battery pack.

[0038] First step: washing the raw materials to remove the attachments on the surface of the raw materials, the raw materials are composed of ceramic fibers, alumina fibers and glass fibers, the proportion of the ceramic fibers, the alumina fibers and the glass fibers is 1:1:2; in the process of washing the raw materials by sending the three kinds of fibers into a washing tank, the fibers with large density are added from the top of the washing tank, and the fibers with small density are added from the bottom of the washing tank, the fibers with large density have a sinking trend, and the fibers with small density have a floating trend, so that the fibers collide and rub in the washing process, and the washing efficiency is improved; stirring blades can be added to stir in the washing process to accelerate the washing; it should be noted that the proportion of the three kinds of fibers is maintained at 1:1:2 after the washing, so as to be used as the preparation raw materials of the heat insulation gasket.

[0039] Second step: putting the washed raw materials into a beater to beat and mix, so that the ceramic fibers, the alumina fibers and the glass fibers in the raw materials are formed into an interlaced and uniform mixture, the beater beats and mixes the raw materials at a speed of 600-750 r / min, and an additive is added in the beating and mixing process of the raw materials, so that the three kinds of fibers in the raw materials do not appear to be gathered; in order to maintain the integrity of the fibers as much as possible, the whole beating process is not less than 600 r / min, and if it is less than 600 r / min, the fibers are not easy to disperse, and the same kind of fibers still gather; the whole beating process is not more than 750 r / min, and if it is more than 750 r / min, the fibers are easy to be broken, and the integrity of the fibers cannot be guaranteed.

[0040] Third step: continuously sending the beaten and mixed raw materials into a gasket forming machine at a uniform speed, adjusting the distance between the preliminary forming compression rollers on the gasket forming machine, pressing the sent raw materials by the preliminary forming compression rollers of the gasket forming machine, removing some water and extending the product, forming a preliminarily shaped gasket product with a certain thickness and width, and the thickness of the preliminarily shaped gasket product is 4.5 mm, 4.8 mm or 5.0 mm; this step preliminarily shapes the gasket product to a certain thickness, so that the gasket product has a certain adsorption gap, to fill the aerogel powder in the subsequent process. When the thickness of the product in the preliminary forming process is less than the thickness of the preliminarily shaped gasket in this step, the adsorption gap in the gasket product is too small, which is not conducive to the entry and uniform filling of the aerogel powder, and when the thickness of the product is greater than the thickness of the gasket in this step, the adsorption gap in the gasket product is sufficient, but in the subsequent aerogel adding process, the aerogel will overflow out of the gasket product through the adsorption gap, affecting the uniformity of the distribution of the aerogel powder in the gasket product.

[0041] Fourth step: from the preliminary sizing of the underlay product surface using a spray method to the underlay product to add particle size 0.4mm or 0.5mm or 0.6mm hydrophilic aerogel powder, and vacuum on the upper surface of the underlay product to the underlay product, through the vacuum to the underlay product below the spray of hydrophilic aerogel powder suction, make the hydrophilic aerogel powder from the underlay product to the upper surface of the internal penetration between the surface, make the aerogel powder radiation the whole thickness of the underlay product, then through the calendering, the thickness of the underlay product is controlled in 3.4mm or 3.8mm or 4mm or 4.2mm or or 4.5mm; wherein, the hydrophilic aerogel powder is the product prepared by the supplier, mainly adding hydrophilic additives, which are wrapped on the surface of the aerogel powder, and the additives contain hydrophilic groups, thereby improving the hydrophilicity of the aerogel powder. Aerogel powder can be added to water by continuous low-speed stirring, mixed and then uniformly sprayed on the surface of the fiber, and sprayed in the width direction to facilitate its uniform dispersion. Although the product is preliminarily shaped by the forming roller in the previous step, the product is still in a relatively fluffy state, i.e. the above-mentioned adsorption gap can be formed between the fibers, and after the thickness control of the product in the previous step, the adsorption gap can be formed for the entry of the hydrophilic aerogel powder and the attachment in the adsorption gap.

[0042] In order to make the aerogel powder more evenly and fully radiate to the inside of the underlay product, the aerogel powder is sprayed under the underlay product and sucked from above the underlay product, i.e. the aerogel powder is sprayed from below the underlay product and sprayed along the width direction of the underlay product, so that the aerogel powder can be sprayed to a certain width of the underlay product below the surface in the product transmission direction, and the suction position is directly above the spraying position. The suction forms a certain negative pressure suction above the upper surface of the underlay product, so that the aerogel powder sprayed from below the underlay product can be adsorbed to the inside of the product from the position of the lower surface of the product and penetrate towards the upper surface of the product. The negative pressure area formed by suction is larger than the spraying area of the aerogel powder sprayed on the lower surface of the product. After projecting downward from above the product, the spraying range is located at the central position of the negative pressure range to completely contain the spraying range. In this way, the sprayed aerogel powder can be completely adsorbed to the inside of the product. The negative pressure value in the negative pressure range formed above the whole underlay product is consistent, which ensures that the suction force on the aerogel powder is balanced during the suction process, avoiding uneven suction and causing uneven radiation of the aerogel powder in the product.

[0043] Fifth step: Apply adhesive on the upper and lower surfaces of the gasket product in the previous step, and the adhesive does not appear to drip. Continue to roll by pressing roller, and the thickness of the gasket product after rolling is controlled at 3.4mm or 3.6mm or 3.8mm or 4.0mm or 4.2mm; the adhesive forms a covering layer on the upper and lower surfaces of the gasket product to form an adhesive surface layer on the upper and lower surfaces, and the upper and lower surfaces of the gasket product are closed. The formed surface layer is flat and smooth on the outside, and no fibers are exposed. Through the rolling of this step, the aerogel and fibers filled in the gasket product can be pressed and bonded, and the bonding strength in the gasket product is enhanced.

[0044] Sixth step: Send the gasket product in the previous step into the microwave heating box, and dry the inside of the gasket product by microwave heating to quickly solidify and shape the inside of the gasket product. The microwave heating temperature is 50℃ or 60℃ or 70℃, and the gasket product is rolled by pressing roller, and the thickness of the gasket product after rolling is controlled at 3.4mm or 3.6mm or 3.8mm or 4mm. After the rolling and shaping of the product in the previous step, the microwave is used to heat the product to quickly coagulate the internal structure of the product into a whole, improve the integrity of the product coagulation, and make the product more stable.

[0045] Seventh step: Dry the gasket product in the previous step by infrared heating, and the heating temperature is 100℃ or 110℃ or 120℃ or 130℃ or 140℃ or 150℃, and the thickness of the gasket product is 3.4mm or 3.6mm or 3.8mm or 4mm. This step dries the outer layer of the product to dry the entire product, and then the product is wound on the roll, which completes the preparation process. The modified aerogel contained in the prepared thermal insulation gasket has a bulk density of 300kg / m 3 -450 kg / m 3 The surface of the thermal insulation gasket is smooth and flat, and the thermal insulation gasket can withstand a temperature of 1200℃ or above.

[0046] In an embodiment of the present application, the diameters of the ceramic fiber, the alumina fiber and the glass fiber are 1 μm or 2 μm or 3 μm or 4 μm or 5 μm or 6 μm or 7 μm or 8 μm; the ceramic fiber is selected to have a fiber length of 6 mm or 8 mm or 12 mm or 15 mm; the alumina fiber is selected to have a fiber length of 8 mm or 10 mm or 15 mm or 20 mm or 25 mm; and the glass fiber is selected to have a fiber length of 12 mm or 15 mm or 25 mm or 35 mm or 45 mm or 50 mm. In the preparation process, the length of the fiber is greater than the thickness of the prepared gasket product, i.e., at least greater than 4 mm, so as to minimize the possibility of the fiber running along the thickness direction of the product inside the product and to avoid the possibility of the fiber being perpendicular to the combustion surface, so as to make the product have stable heat insulation performance. The length of the glass fiber is more than 2 times the length of the other two fibers, the overall strength of the product is enhanced by the glass fiber, one is to avoid the production stoppage caused by being pulled apart during the stretching process in the preparation process, and the other is to make the structure between the fibers interwoven inside the product more stable, so as to improve the overall strength of the product; compared with the heat insulation gasket without the addition of the glass fiber, the overall strength of the gasket is increased by more than 40% after the addition of the glass fiber with the above length.

[0047] In an embodiment of the present application, the auxiliary agent includes inorganic additives, cationic additives and neutral ion additives; the amount of the inorganic additives is 0.5% or 1% or 1.5% or 2% or 2.5% or 3% or 3.5% or 4% of the weight of the raw material, the amount of the cationic additives is 0.1% or 0.5% or 1% of the weight of the raw material, and the amount of the neutral ion additives is 0.1% or 0.5% or 1% of the weight of the raw material. The neutral ion additives and the cationic additives are used to make the product have better glue retention and to attach the inorganic additives in the product, the inorganic additives can be aerogel or white carbon black; the cationic additives can be one or a combination of cationic cellulose, cationic guar gum and cationic starch, and the neutral ion additives use neutral sodium cellulose; in the adding process of the auxiliary agent, the neutral ion additives are added first to reduce the influence on the product system and to also disperse the fibers, and then the cationic additives are added as the medium between the fibers and the inorganic additives.

[0048] In an embodiment of the present application, the adhesive is a mixture of an acrylic adhesive and a vinyl acetate adhesive, and the ratio is 4:1. The adhesive can make the fibers in the product more firmly bonded to form a whole, so as to ensure the stable performance of the gasket product.

[0049] In the process of spraying aerogel powder, a plurality of nozzles arranged along the width direction of the cushion product are used to spray under the cushion product, and the aerogel powder is distributed to the lower surface of the cushion product by the spraying of the plurality of nozzles; the spraying range of the two outermost nozzles spreads outside the product edge, so that the entire width of the product can be sprayed, and arc-shaped baffles are arranged outside the two outermost nozzles, respectively, the lower end of the arc-shaped baffle is a fixed end, the upper end is bent in an arc shape towards the side of the cushion, the inner side of the arc-shaped baffle is a continuous curved surface, the upper end of the arc-shaped baffle is flush with the side of the cushion product, and the aerogel powder sprayed beyond the width of the cushion product by the outermost nozzles is guided to the lower surface of the cushion product by the continuous curved surface, reducing the loss of aerogel powder.

[0050] In the vacuum suction process, a plurality of vacuum suction heads arranged along the width of the cushion product are used to generate negative pressure suction, and a blocking frame is fixedly arranged above the cushion product, the blocking frame has a plurality of mesh holes corresponding in number and position to the vacuum suction heads, one mesh hole corresponding to one vacuum suction head, the lower end of the vacuum suction head extending into the mesh hole, but the vacuum suction head does not expose below the mesh, and when negative pressure suction is formed, even if the cushion product is partially adsorbed upward, the connection between the mesh holes will be blocked to reduce the influence of negative pressure adsorption on the cushion product.

[0051] The following parameters are combined to obtain the cushion product, which has a better thermal conductivity:

[0052]

[0053] After high-temperature treatment of two competitive products and the product of the application under simulated battery pack combustion environment, the fiber surface micrograph of Figures 1-3 is obtained, wherein Figure 1 the fiber surface of competitive product 1 is damaged the most seriously, Figure 2 the fiber surface of competitive product 2 is also damaged to a certain extent, and Figure 3 the fiber surface of the cushion product of the application is still smooth and flat without damage.

[0054] Finally, it should be noted that: the above embodiments are merely the preferred embodiments of the present application to illustrate the technical solutions of the present application, but not limit, nor limit the patent scope of the present application; although the present application is described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application; in addition, the technical solutions of the present application are directly or indirectly applied to other related technical fields, which are also included in the patent protection scope of the present application.

Claims

1. A method for preparing a heat-insulating liner for a battery pack in new energy vehicles, characterized in that: It comprises the following steps, The first step: water washing raw materials, removing the attachments on the surface of the raw materials, the raw materials are composed of ceramic fiber, alumina fiber and glass fiber, wherein the ratio of ceramic fiber, alumina fiber and glass fiber is 1:1:2; The second step: put the water washed raw materials into the beater to disperse and mix, so that the ceramic fiber, alumina fiber and glass fiber in the raw materials are evenly mixed, the beater disperses and mixes the raw materials at a speed of 600-750 rpm, and an additive is added during the dispersion and mixing process of the raw materials, so that the three fibers in the raw materials do not appear to be clustered; The third step: the uniformly continuous raw materials after dispersion and mixing are sent into the gasket forming machine, the distance between the preliminary forming rollers on the gasket forming machine is controlled, the raw materials are pressed by the preliminary forming rollers of the gasket forming machine, and the preliminary shaped gasket product is formed, the thickness of the preliminary shaped gasket product is 4.5-5.0 mm; The fourth step: from the lower surface of the preliminary shaped gasket product, spray 0.4-0.6 mm hydrophilic aerogel powder towards the gasket product, and vacuumize the upper surface of the gasket product, so that the suction force of the vacuumization is generated on the hydrophilic aerogel powder sprayed below the gasket product, the hydrophilic aerogel powder is penetrated from the lower surface to the upper surface of the gasket product, and the gasket product is penetrated by the gasket product, and then the gasket product is pressed by the roller, and the thickness of the gasket product is controlled at 3.6-4.5 mm; The fifth step: the adhesive is applied on the upper and lower surfaces of the gasket product, the adhesive does not appear to be dropped, and the gasket product is continuously pressed by the roller, and the thickness of the gasket product after pressing is controlled at 3.4-4.2 mm; The sixth step: the gasket product is sent into the microwave heating box, the inside of the gasket product is dried by microwave heating, the inside of the gasket product is quickly solidified and shaped, the microwave heating temperature is 50-70℃, the gasket product is continuously pressed by the roller, and the thickness of the gasket product after pressing is controlled at 3.4-4 mm; The seventh step: the gasket product is dried by infrared heating, the heating temperature is 100-150℃, and the gasket product with a thickness of 3.4-4 mm is obtained.

2. The preparation method of the heat insulation gasket for new energy automobile battery pack according to claim 1, wherein the diameters of the ceramic fiber, alumina fiber and glass fiber are 1-8 μm; The length of the ceramic fiber is 6-15 mm, the length of the alumina fiber is 8-25 mm, and the length of the glass fiber is 12-50 mm.

3. The preparation method of the heat insulation gasket for new energy automobile battery pack according to claim 1, wherein the additive comprises inorganic additive, cationic additive and neutral ion additive; The amount of inorganic additive is 0.5%-4% of the weight of raw materials, the amount of cationic additive is 0.1%-1% of the weight of raw materials, and the amount of neutral ion additive is 0.1%-1% of the weight of raw materials. ​ ​ 4. The preparation method of the thermal insulation liner for new energy vehicle battery packs according to claim 1, characterized in that: The adhesive is a mixture of acrylic adhesive and vinyl acetate adhesive, and the ratio is 4:

1.

5. The preparation method of the thermal insulation liner for new energy vehicle battery packs according to claim 1, characterized in that: The aerogel powder is filled in the gaps between the three kinds of fibers in the raw materials.

6. The method for preparing the thermal insulation pad for new energy vehicle battery pack according to any one of claims 1-5, characterized in that: The prepared aerogel composite ceramic fiber thermal insulation liner contains aerogel with a volume weight of 300 kg / m³-450 kg / m³, and the surface of the thermal insulation liner is smooth and flat.

7. The preparation method of the thermal insulation liner for new energy vehicle battery packs according to claim 1, characterized in that: The prepared thermal insulation liner can withstand a temperature of 1200℃ or above.

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