Ceramic explosion-proof mica plate for high-safety power battery and preparation method of ceramic explosion-proof mica plate

Abstract

The invention relates to the field of safety protection of new energy power batteries, and discloses a ceramic explosion-proof mica plate for a high-safety power battery and a preparation method of the ceramic explosion-proof mica plate, and the ceramic explosion-proof mica plate comprises the following components: 40-60 parts of a mica paper base material as a main body structure material; 10-20 parts of chlorinated rubber used for enhancing flexibility and bonding performance; the ammonium polyphosphate is used as an intumescent flame retardant and is used for forming a carbonization layer; the expanded graphite is used for forming an expanded heat insulation structure at a high temperature; the titanium dioxide is used for improving the adhesive force and the heat resistance of a surface coating. By optimizing the proportion of the expansion material of the mica plate, introducing the high-temperature-resistant coating and enhancing the porcelainizing capacity, the expansion performance, high-temperature structural stability and fire extinguishing efficiency of the mica plate are remarkably improved, the problems of incomplete expansion layer, material layering cracks, poor fire extinguishing effect and the like in the prior art are solved, and meanwhile comprehensive performance optimization is considered.

Description

Technical Field

[0001] The present invention relates to the field of safety protection for new energy power batteries, and specifically to a ceramized explosion-proof mica plate for high-safety power batteries and a preparation method thereof. Background Art

[0002] With the rapid development of new energy power batteries, the safety issues in high-energy density application scenarios have gradually emerged. When power batteries are in high-temperature, overloaded or short-circuited situations, they are prone to thermal runaway, leading to fires or explosions, posing serious safety hazards. To reduce risks, mica plates are widely used as heat insulation and fireproof materials in the prior art, and the batteries are protected by their excellent high-temperature resistance and electrical insulation properties. However, when traditional mica plates are dealing with high-temperature flames and rapid heat diffusion, their performance still has obvious deficiencies and is difficult to fully meet the actual requirements. In recent years, some studies have tried to improve the high-temperature protection performance of mica plates through modification means such as adding flame retardants, expanded graphite, and high-temperature coatings, but the improvement effect is limited and the problem has not been fundamentally solved.

[0003] The mica plates in the prior art are usually composed of a natural mica paper substrate and a composite of flame retardant fillers, high-temperature coatings, etc. The following problems mainly exist in the actual use of such materials: First, the expansion performance is poor. The content of flame retardant fillers or expanded graphite is insufficient or unevenly distributed, resulting in the inability to form a complete and dense expansion layer at high temperatures, making it difficult to effectively block the diffusion of flames and heat; Second, the high-temperature structural stability is not good. In a high-temperature environment, the material is prone to delamination, disintegration or cracking, resulting in a rapid decline in mechanical properties and heat insulation ability; Third, the fire extinguishing performance of the coating is insufficient. The existing coatings have limited ability to release non-combustible gases, low expansion efficiency, and long fire extinguishing time, and cannot achieve rapid fire extinguishing; Fourth, the comprehensive performance optimization of the material is insufficient, and it is difficult to simultaneously take into account multiple performances such as expansion, fire prevention, fire extinguishing, and insulation. These problems make the prior art unable to effectively meet the high-temperature protection requirements of power batteries, and there is an urgent need to achieve more efficient performance optimization through new structural designs and material combinations. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a ceramized explosion-proof mica plate for high-safety power batteries and a preparation method thereof, which solve the problems of insufficient expansion performance, poor high-temperature structural stability, low coating fire extinguishing efficiency, and poor comprehensive performance optimization of mica plates in the prior art.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A ceramized explosion-proof mica plate for high-safety power batteries and a preparation method thereof, including the following components: Mica paper substrate: 40 - 60 parts, as the main structural material; Chlorinated rubber: 10 - 20 parts, used to enhance flexibility and bonding performance; Ammonium polyphosphate: 3 - 8 parts, as an intumescent flame retardant, used to form a char layer; Expanded graphite: 3 - 8 parts, used to form an expanded heat-insulating structure at high temperature; Titanium dioxide: 2 - 5 parts, used to improve the adhesion and heat resistance of the surface coating; Aluminum silicate fiber: 5 - 15 parts, providing high-temperature ceramization support; Phosphate binder: 2 - 6 parts, used for high-temperature chemical bonding and ceramization; Aluminum oxide powder: 2 - 6 parts, used to increase the high-temperature hardness of the material; An intumescent fire-extinguishing coating coated on the surface of the mica plate, the coating comprising: High-temperature resistant silicone rubber: 20 - 30 parts, used for the stable support of the coating at high temperature; Aerosol fire-extinguishing powder: 10 - 15 parts, used to release non-combustible gases at high temperature for fire extinguishing.

[0006] Preferably, the mass fraction of the chlorinated rubber is 15 - 18 parts, used to enhance the internal bonding force of the material during the hot pressing process.

[0007] Preferably, the mass fraction ratio of the ammonium polyphosphate to the expanded graphite is 1:1, aiming to ensure the uniformity and fireproof performance of the expanded layer.

[0008] Preferably, the mass fraction of the titanium dioxide is 3 - 4 parts, used to optimize the smoothness and heat reflectivity of the coating.

[0009] Preferably, the mass fraction ratio of the high-temperature resistant silicone rubber to the aerosol fire-extinguishing powder in the intumescent fire-extinguishing coating is 2:1, to achieve the synergistic effect of expansion and fire extinguishing at high temperature.

[0010] A preparation method of a porcelainizable explosion-proof mica plate for a new energy power battery, comprising the following steps: (1) Treatment liquid preparation: Mix chlorinated rubber, ammonium polyphosphate, expanded graphite and titanium dioxide in proportion, add ethanol or methanol solvent, stir at a speed of 500 - 700 rpm for 60 - 80 minutes to obtain a uniform treatment liquid; (2) Mica paper impregnation: Pass the mica paper through the treatment liquid impregnation device at a speed of 2 - 4 m / min, ensure uniform adsorption, and then dry it at 80 - 100 °C for 10 - 15 minutes; (3) Laminating and forming: Stack the treated mica papers by layers, and hot press them at a temperature of 180 - 260 °C and a pressure of 1.9 - 2.6 MPa for 30 - 50 minutes to obtain a matrix mica plate; (4) Coating preparation: Mix high-temperature resistant silicone rubber and aerosol fire extinguishing powder in proportion, with a stirring speed of 600 - 700 rpm and a time of 65 - 80 minutes to prepare a uniform expanded fire extinguishing coating; (5) Coating and drying: Use the slit coating process to evenly coat the coating on the surface of the mica plate, with a coating thickness of 0.5 ± 0.1 mm and a coating speed of 6 - 8 m / min. Subsequently, cure it under three-stage drying conditions: The first zone: 80 - 100 °C, time 10 - 15 minutes; The second zone: 130 - 150 °C, time 10 - 15 minutes; The third zone: 100 - 110 °C, time 15 - 20 minutes; (6) High-temperature ceramization treatment: Treat at a high temperature of 800 - 1000 °C for 10 - 20 minutes to obtain a dense ceramicized layer on the surface.

[0011] Preferably, the stirring speed of the treatment liquid is preferably 600 rpm, and the stirring time is preferably 70 minutes to ensure the uniform dispersion of ammonium polyphosphate and expanded graphite.

[0012] Preferably, the impregnation speed of the mica paper is preferably 3 m / min to ensure the full adsorption of the treatment liquid on the surface of the mica paper.

[0013] Preferably, the hot pressing temperature is 220 °C, the pressure is 2.3 MPa, and the time is 40 minutes to ensure the high-strength bonding between the mica paper layers.

[0014] Preferably, the final thickness of the coating is 0.5 mm. Adopt a multi-stage drying process to avoid cracks or bubbles and ensure the adhesion and stability of the coating.

[0015] The present invention provides a ceramicized explosion-proof mica plate for high-safety power batteries and a preparation method thereof. It has the following Beneficial effects: 1. By adopting the technical solutions of introducing high-temperature expansion barrier technology and surface coating of expanded fire extinguishing coating in the mica plate, the present invention realizes the rapid expansion and fire extinguishing functions of materials in a high-temperature flame environment. Compared with the traditional mica plate that only has heat insulation performance in the prior art, it effectively solves the problem that it cannot inhibit the spread of flames and improves the safety protection performance.

[0016] 2. By adding the combined design of aluminosilicate fiber, phosphate binder and alumina powder, the present invention endows the mica plate with the ability to form a dense ceramicized layer under high-temperature conditions. This ceramicized layer can maintain the structural stability of the mica plate and prevent delamination or disintegration caused by high-temperature pyrolysis. Compared with the problem that the traditional mica plate loses strength and structural stability at high temperature, the present invention solves the technical bottleneck of its insufficient high-temperature resistance.

[0017] 3. By optimizing the proportion combination of expanded graphite and ammonium polyphosphate, the present invention designs a treatment liquid with excellent expansion barrier performance. This treatment liquid can enable the mica plate to rapidly expand by more than 5 cm under high-temperature flames, blocking the outward diffusion of the flame. The problems of insufficient expansion ratio or shedding of the expansion layer in the fireproof materials of the prior art are effectively improved in the present invention, further enhancing the reliability of the fireproof performance.

[0018] 4. By adopting a multi-stage drying and hot pressing forming process, the present invention ensures the tight combination of the expansion fire extinguishing coating and the mica plate substrate. Compared with the problems of poor coating adhesion or easy shedding in the prior art, the stability and service life of the coating are significantly improved. At the same time, by optimizing the coating thickness and uniformity, the fire extinguishing coating has higher effect consistency and durability in practical applications. Description of the Drawings

[0019] Figure 1 It is a schematic flow chart of the method of the present invention. Detailed Embodiments

[0020] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0021] Please refer to the attached Figure 1 , the embodiments of the present invention provide a ceramizable explosion-proof mica plate for high-safety power batteries and a preparation method thereof, including: Composition of the ceramizable explosion-proof mica plate Mica plate substrate and modification treatment The mica plate substrate is selected as natural phlogopite paper and impregnated and modified with a treatment liquid to enhance its high-temperature performance. The modified mica paper can expand under high-temperature conditions and also has a certain ceramization ability. The specific formula and mechanism analysis are as follows: Chlorinated rubber (50 - 70 parts): Provides the flexibility and formability of the substrate, and at the same time serves as an organic skeleton to enhance the mechanical strength of the mica paper under high-temperature conditions. Its high-temperature decomposition characteristics can block heat transfer in the initial stage and assist the expansion reaction.

[0022] Ammonium polyphosphate (PCN, 15 - 25 parts): Is an intumescent flame retardant that decomposes into incombustible gases (such as ammonia and phosphoric acid) at high temperatures, and at the same time promotes the formation of a carbon layer. The carbon layer can effectively isolate heat and provide preliminary fire protection.

[0023] Expanded graphite (15 - 25 parts): It rapidly expands at high temperatures to form a pore structure, inhibiting heat transfer and flame spread through physical barrier effects. Its unique "layered exfoliation" structure provides a greater volume expansion rate during expansion, further enhancing the fireproof and heat-insulating properties.

[0024] Titanium dioxide (10 - 20 parts): As a filler, it improves the adhesion and thermal stability of the surface coating. Its stability at high temperatures contributes to the hardening and leveling of the material surface.

[0025] After modification, mica paper forms a carbon layer and a gas barrier layer at high temperatures through the rapid expansion of expanded graphite and the gas release of ammonium polyphosphate, thus effectively isolating the flame and heat; the decomposition of chlorinated rubber further releases flame-retardant gases while maintaining the toughness of the substrate and preventing it from breaking under thermal stress.

[0026] Ceramic strengthening component Adding high-temperature ceramicizing components to mica paper endows the mica board with structural stability under high-temperature conditions. The specific components and mechanisms are as follows: Aluminum silicate fiber (10 - 15 parts): It forms a dense ceramic skeleton structure at high temperatures, having good fire resistance and thermal shock resistance, and can maintain the overall strength of the material under flame conditions.

[0027] Phosphate binder (5 - 10 parts): It combines with aluminum silicate fiber through high-temperature chemical reactions to form a ceramic bonding layer with certain toughness and strength, further enhancing the material stability under high-temperature environments.

[0028] Aluminum oxide powder (5 - 10 parts): It improves the density of the ceramicized layer, forming strong compressive and heat-insulating properties.

[0029] The above components form a dense ceramic layer through high-temperature phase transformation and chemical reactions, and this process can be explained by sintering theory and the theory of material thermal stability. At high temperatures, aluminum silicate fiber and aluminum oxide powder achieve ceramicization through crystal structure rearrangement, and the phosphate binder acts as a liquid-phase bonding material to accelerate the sintering process and form a stable high-temperature protective layer.

[0030] Expansion fire extinguishing coating Coating an intumescent fire extinguishing coating on the surface of the mica board for fire extinguishing functions under flame conditions. The coating formula is as follows: High-temperature resistant silicone rubber (50 - 70 parts): At high temperatures, it releases non-combustible gases (such as silicon dioxide gas) through the breaking of silicon-oxygen bonds, blocking the contact between oxygen and the flame and inhibiting the combustion reaction.

[0031] Aerosol fire extinguishing powder (35 - 45 parts): As the core fire extinguishing component, it releases a large amount of non-combustible gases (such as nitrogen and carbon dioxide) through physical and chemical reactions under flame conditions to achieve rapid fire extinguishing.

[0032] The high-temperature decomposition process of the high-temperature resistant silicone rubber provides good heat resistance protection. At the same time, the rapid reaction of the aerosol fire extinguishing powder releases non-combustible gases, forming a double-barrier effect. On the one hand, it physically isolates the flame, and on the other hand, it dilutes the oxygen concentration through non-combustible gases to inhibit the combustion chemical reaction.

[0033] Preparation Method and Mechanism of Ceramicizable Explosion-proof Mica Plate Preparation of the pretreatment solution for mica paper: Mix chlorinated rubber, ammonium polyphosphate, expanded graphite and titanium dioxide in proportion, add a solvent (such as an ethanol / methanol mixture), and stir at 500 - 700 rpm (preferably 600 rpm) for 60 - 80 minutes to obtain a uniform treatment solution.

[0034] Impregnation process: Immerse the phlogopite paper in the treatment solution at a speed of 2 - 4 m / min (preferably 3 m / min) to ensure uniform coverage on the surface.

[0035] Drying: Dry at 80 - 100 °C for 10 - 15 minutes to remove the surface solvent.

[0036] Through the uniform dispersion and impregnation of the treatment solution, expanded graphite and flame retardants are effectively adsorbed on the surface of the mica paper, providing a basis for subsequent thermal expansion and flame retardant properties; the drying process ensures the volatilization of the solvent and avoids glue overflow during subsequent molding.

[0037] Hot pressing and forming of mica plate Laminating process: Stack multiple layers of treated mica paper with a uniform thickness.

[0038] Hot pressing parameters: 180 - 260 °C (preferably 220 °C), pressure 1.9 - 2.6 MPa (preferably 2.3 MPa), hot pressing time 30 - 50 minutes (preferably 40 minutes).

[0039] During the hot pressing process, chlorinated rubber partially melts under high-temperature conditions, acting as a bonding layer and a structural layer to ensure the bonding strength between layers; expanded graphite is pre-activated in the local high-temperature area, providing a preliminary expansion effect to avoid voids or defects in the finished plate.

[0040] Coating application and drying coating process: Mix high-temperature resistant silicone rubber and aerosol fire extinguishing powder in proportion, and uniformly coat it on the surface of the mica plate. The coating thickness is 0.5 ± 0.1 mm, and the coating speed is 6 - 8 m / min.

[0041] Drying parameters: Adopt a three-stage drying process, which are respectively: The first zone: 80 - 100 °C, time 10 - 15 minutes; The second zone: 130 - 150 °C, time 10 - 15 minutes; Third zone: 100 - 110 °C, time 15 - 20 minutes.

[0042] The multi-stage drying process avoids cracks or bubbles in the coating by gradually increasing the temperature, while ensuring the uniformity of the high-temperature resistant silicone rubber and the fire extinguishing powder. The coating thickness is controlled within a reasonable range to ensure the expansion performance and adhesion.

[0043] High-temperature porcelainization treatment Porcelainization conditions: Treat at 800 - 1000 °C for 10 - 20 minutes to form a dense ceramic layer.

[0044] Under high-temperature conditions, aluminum silicate fiber and alumina powder form a ceramic network structure through interaction, and the phosphate binder promotes solid-phase sintering, resulting in a stable ceramic protection layer on the surface and inside of the material.

[0045] Example 1 1. Pretreatment of mica paper Cut the phlogopite paper into sheets with a size of 500 mm × 500 mm for standby. Prepare the treatment liquid, weigh 60 parts of chlorinated rubber, 20 parts of ammonium polyphosphate, 20 parts of expanded graphite, and 15 parts of titanium dioxide according to the mass ratio, and add an appropriate amount of ethanol as a solvent. Put the mixture into a blender and stir at 600 rpm for 70 minutes to form a uniform treatment liquid. Immerse the mica paper in the treatment liquid at a speed of 3 m / min to ensure uniform adsorption. Then put it into an oven and dry at 90 °C for 12 minutes to complete the pretreatment.

[0046] 2. Hot pressing and forming Stack 10 layers of pretreated mica paper and put them into a hot pressing mold. The hot press is set at a temperature of 220 °C, a pressure of 2.3 MPa, and pressed continuously for 40 minutes to obtain a matrix mica board with a thickness of 2 mm. After taking it out, cool it for standby.

[0047] 3. Coating of expandable fire extinguishing coating Prepare the coating material, mix 60 parts of high-temperature resistant silicone rubber and 40 parts of aerosol fire extinguishing powder in proportion, and stir the mixer at 600 rpm for 65 minutes to ensure uniform dispersion. Adopt the slit coating process to uniformly coat the coating on the surface of the mica board, control the coating thickness at 0.5 mm, and the coating speed at 7 m / min. After coating, put it into a drying equipment and heat it in three zones in turn: the first section at 90 °C for 12 minutes; the second section at 140 °C for 12 minutes; the third section at 105 °C for 18 minutes for drying and curing.

[0048] 4. Porcelainization treatment Put the prepared mica board into a high-temperature furnace and treat it at a high temperature of 900 °C for 15 minutes to form a dense ceramicized layer on the surface of the mica board.

[0049] Example 2 1. Mica paper pretreatment Select natural phlogopite paper sheets with dimensions of 400mm×600mm. Prepare the treatment solution by mixing 50 parts of chlorinated rubber, 18 parts of ammonium polyphosphate, 22 parts of expanded graphite, and 12 parts of titanium dioxide, and adding a methanol / ethanol mixed solvent. After stirring the treatment solution at 500 rpm for 60 minutes, a uniform liquid state is formed. Immerse the mica paper into the treatment solution through an impregnation device at a speed of 2.5 m / min, and after uniform adsorption, place it in an oven and dry at 100°C for 15 minutes.

[0050] 2. Hot pressing and forming Stack the pretreated mica papers in sequence to 8 layers to form a preliminary sheet structure. Place the sheet in a hot pressing mold, hot press at 260°C for 30 minutes, and apply a pressure of 2.0 MPa. Obtain a preliminary mica board with a thickness of about 1.8 mm, and cool it for standby.

[0051] 3. Coating preparation and coating Weigh the raw materials according to the ratio of 57 parts of high-temperature resistant silicone rubber and 43 parts of aerosol fire extinguishing powder. Stir the mixture at 700 rpm for 70 minutes with a blender to make an expanded fire extinguishing coating liquid. Adopt a multi-layer scraping coating process, coat it on the surface of the mica board in two times, with each coating thickness of 0.3 mm, and the total thickness is controlled at 0.6 mm. After coating, place it in a drying oven and dry it in three zones: the first zone at 95°C for 10 minutes; the second zone at 150°C for 10 minutes; the third zone at 110°C for 15 minutes.

[0052] 4. Ceramicization test Test the ceramicization performance of the mica board under the high-temperature condition of 800°C, and it is found that a stable ceramicized layer is formed on its surface without cracks or peeling phenomena.

[0053] Example 3 1. Pretreatment process Slice the natural phlogopite paper into sheets with dimensions of 300mm×300mm. Prepare the treatment solution according to the ratio of 70 parts of chlorinated rubber, 25 parts of ammonium polyphosphate, 18 parts of expanded graphite, and 20 parts of titanium dioxide, and add an appropriate amount of absolute ethanol and stir evenly. After stirring the treatment solution at 700 rpm for 75 minutes, use a roller device to pass the mica paper through the dipping tank at a speed of 3.5 m / min. After dipping, place the mica paper in a drying device at 90°C for 10 minutes.

[0054] 2. Pressing and forming Stack 10 layers of the treated mica papers into the mold. The hot pressing conditions are a temperature of 200°C, a pressure of 1.9 MPa, and a time of 50 minutes, and press to form a mica board with a thickness of 2.2 mm.

[0055] 3. Coating and curing The coating material is prepared in a ratio of 65 parts of high-temperature resistant silicone rubber and 35 parts of aerosol fire extinguishing powder, and stirred in a blender at 500 rpm for 80 minutes. The slit coating method is adopted, and it is evenly coated on the surface of the mica plate at a speed of 6 m / min, and the coating thickness is 0.4 mm. After coating, the mica plate is sent into a three-stage drying furnace, and the temperatures are: 80°C for 10 minutes, 130°C for 15 minutes, and 100°C for 20 minutes.

[0056] 4. Fire resistance and expansion test Under the simulated battery flame environment (flame temperature 950°C), the expansion performance of the mica plate is tested. The results show that its expansion thickness reaches 5.5 cm, the flame is quickly suppressed, and no delamination or damage appears on the surface.

[0057] Example 4 1. Treatment and hot pressing of mica paper The size of the natural phlogopite paper is set to 600 mm × 600 mm, and a treatment solution is prepared in a ratio of 65 parts of chlorinated rubber, 22 parts of ammonium polyphosphate, 20 parts of expanded graphite, and 18 parts of titanium dioxide. The stirring speed is set to 650 rpm, and the stirring time is 75 minutes. The mica paper passes through the impregnation tank at a speed of 3 m / min to ensure that the treatment solution is evenly covered. The drying conditions are 90°C and 12 minutes. Stack 8 layers of mica paper, and the hot pressing parameters are 220°C, 2.6 MPa, and time 35 minutes to form a substrate mica plate with a thickness of 2.0 mm.

[0058] 2. Coating process The high-temperature resistant silicone rubber and the aerosol fire extinguishing powder are mixed in a ratio of 60:40 and stirred for 70 minutes to prepare a uniform coating material. The automatic spraying process is adopted, and the coating is sprayed on the surface of the mica plate at a speed of 8 m / min, and the spraying thickness is controlled at 0.5 mm. Subsequently, the mica plate is sent into a drying oven, and three-stage drying is set: 90°C for 10 minutes, 140°C for 12 minutes, and 110°C for 15 minutes to complete the coating curing.

[0059] 3. Ceraming performance test After treating the mica plate at 900°C for 15 minutes, a complete and dense ceramic layer is formed on the surface. In the high-temperature compressive test, the ceramic layer remains intact and no cracks appear.

[0060] Example 5 1. Mica paper modification Use natural phlogopite paper and cut it to a size of 400 mm × 400 mm. Prepare a treatment solution: 58 parts of chlorinated rubber, 20 parts of ammonium polyphosphate, 22 parts of expanded graphite, and 15 parts of titanium dioxide. The stirring parameters are 550 rpm and time 65 minutes. The impregnation speed is set to 2.5 m / min, and the drying conditions are 80°C and 15 minutes.

[0061] 2. Pressing and coating The hot pressing parameters are 250 °C, 2.3 MPa, and a time of 40 minutes, and the forming thickness is 2.1 mm. The coating material is mixed in a ratio of 65:35 of high-temperature resistant silicone rubber to aerosol fire extinguishing powder, the slit coating speed is 7.5 m / min, and the coating thickness is controlled at 0.6 mm. The three drying stages are 85 °C, 140 °C, and 105 °C in sequence, with a time of 15 minutes for each stage.

[0062] 3. Comprehensive performance test Place the mica plate in a simulated battery flame environment to test the expansion thickness and fire extinguishing performance. The results show that the expansion thickness is 5.3 cm, the flame is extinguished within 3 seconds, and the electrical insulation strength is 30 kV / mm.

[0063] Comparative example 1 (corresponding to Example 1) Adjust the proportion of expanded graphite in Example 1, reduce it from 20 parts to 10 parts, and keep the other component ratios unchanged. The specific preparation process is as follows: Pretreatment of mica paper: Prepare the treatment solution, weigh 60 parts of chlorinated rubber, 20 parts of ammonium polyphosphate, 10 parts of expanded graphite, and 15 parts of titanium dioxide according to the mass fraction ratio, add ethanol solvent and stir for 60 minutes, and the stirring speed is 600 rpm. Immerse the mica paper in the treatment solution at a speed of 3 m / min, and then dry it at 90 °C for 12 minutes.

[0064] Hot pressing and forming: Stack 10 layers of pretreated mica paper, set the hot pressing conditions as 220 °C, 2.3 MPa, and a time of 40 minutes, and take it out after cooling to form a matrix mica plate.

[0065] Coating application: Mix 60 parts of high-temperature resistant silicone rubber and 40 parts of aerosol fire extinguishing powder according to the ratio, and stir the coating liquid with a mixer at 600 rpm for 65 minutes. The slit coating thickness is controlled at 0.5 mm, and the coating speed is 7 m / min. The drying temperatures are 90 °C (12 minutes), 140 °C (12 minutes), and 105 °C (18 minutes).

[0066] Ceramization treatment: Put the coated mica plate into a high-temperature furnace and treat it at 900 °C for 15 minutes.

[0067] Comparative example 2 (corresponding to Example 2) Adjust the hot pressing pressure in Example 2, reduce it from 2.0 MPa to 1.5 MPa, and keep the other steps and component ratios consistent. The specific preparation process is as follows: Pretreatment of mica paper: Use the material ratio and impregnation process of Example 2. Mix 50 parts of chlorinated rubber, 18 parts of ammonium polyphosphate, 22 parts of expanded graphite, and 12 parts of titanium dioxide, with a stirring speed of 500 rpm and a stirring time of 60 minutes. The impregnation speed of mica paper is 2.5 m / min, the drying temperature is 100 °C, and the drying time is 15 minutes.

[0068] Hot pressing forming: Stack 8 layers of mica paper into the mold. The hot pressing temperature is 260 °C, the hot pressing time is 30 minutes, the pressure is reduced to 1.5 MPa, and take it out for cooling after completion.

[0069] Coating and curing: The coating ratio and process are the same as those in Example 2. The total coating thickness is 0.6 mm, and it is coated in two times. The coating speed is 6.5 m / min, and the drying temperatures are 95 °C (10 minutes), 150 °C (10 minutes), and 110 °C (15 minutes) in sequence.

[0070] Ceramming treatment: Treat the mica plate at 800 °C for 15 minutes and then set it aside for use.

[0071] Comparative Example 3 (corresponding to Example 3) Adjust the coating thickness in Example 3, and reduce it from 0.5 mm to 0.3 mm. Keep other formulation and process parameters unchanged, and the preparation process is as follows: Pretreatment of mica paper: Adopt the formulation and impregnation parameters of Example 3. Mix 70 parts of chlorinated rubber, 25 parts of ammonium polyphosphate, 18 parts of expanded graphite, and 20 parts of titanium dioxide, with a stirring speed of 700 rpm and a time of 75 minutes. The impregnation speed of mica paper is 3.5 m / min, the drying temperature is 90 °C, and the drying time is 10 minutes.

[0072] Hot pressing forming: Hot press 10 layers of pretreated mica paper. The hot pressing parameters are 200 °C, 1.9 MPa, and a time of 50 minutes, and cool it after pressing.

[0073] Coating application: Mix according to the ratio of 65 parts of high-temperature resistant silicone rubber and 35 parts of aerosol fire extinguishing powder, with a stirring speed of 500 rpm and a time of 80 minutes. Adopt the slit coating process, control the coating thickness to 0.3 mm, and the coating speed is 6 m / min. The drying temperatures are 80 °C (10 minutes), 130 °C (15 minutes), and 100 °C (20 minutes) in sequence.

[0074] Ceramming treatment: Treat the mica plate at 950 °C for 10 minutes to initially form a ceramicized layer on its surface.

[0075] Comparative Example 4 (corresponding to Example 4) Adjust the ratio of ammonium polyphosphate in Example 4, and increase it from 22 parts to 30 parts. Keep other formulations and processes unchanged, and the specific process is as follows: Pretreatment of mica paper: Mix the treatment liquid according to the ratio of 65 parts of chlorinated rubber, 30 parts of ammonium polyphosphate, 20 parts of expanded graphite, and 18 parts of titanium dioxide, and add ethanol and stir evenly. The stirring speed is 650 rpm, and the stirring time is 75 minutes. The impregnation speed of mica paper is 3 m / min, the drying temperature is 90 °C, and the time is 12 minutes.

[0076] Hot pressing: Stack and press 8 layers of mica paper. The hot pressing temperature is 220 °C, the pressure is 2.6 MPa, and the time is 35 minutes to form a mica plate with a thickness of 2.0 mm.

[0077] Coating application: Use the coating ratio of Example 4 (60 parts of high-temperature resistant silicone rubber and 40 parts of aerosol fire extinguishing powder). After mixing, stir at 600 rpm for 70 minutes. The spraying speed is 8 m / min, and the coating thickness is controlled at 0.5 mm. The drying temperatures are 90 °C, 140 °C, and 110 °C, and the times are 10 minutes, 12 minutes, and 15 minutes in sequence.

[0078] Ceramization treatment: Put the coated mica plate into a high-temperature furnace and treat it at 900 °C for 15 minutes.

[0079] Comparative Example 5 (corresponding to Example 5) Adjust the ratio of high-temperature resistant silicone rubber to aerosol fire extinguishing powder in Example 5 from 65:35 to 40:60, and keep other process steps unchanged. The specific preparation process is as follows: Pretreatment of mica paper: The ratio of the treatment liquid is 58 parts of chlorinated rubber, 20 parts of ammonium polyphosphate, 22 parts of expanded graphite, and 15 parts of titanium dioxide. The stirring speed is 550 rpm, and the stirring time is 65 minutes. The impregnation speed of mica paper is 2.5 m / min, the drying temperature is 80 °C, and the time is 15 minutes.

[0080] Hot pressing: The hot pressing temperature is 250 °C, the pressure is 2.3 MPa, and the time is 40 minutes to form a mica plate with a thickness of 2.1 mm.

[0081] Coating and curing: Adjust the coating ratio to 40 parts of high-temperature resistant silicone rubber and 60 parts of aerosol fire extinguishing powder. After mixing, stir at a speed of 600 rpm for 70 minutes. The coating speed is 7.5 m / min, and the coating thickness is 0.6 mm. The three-stage drying temperatures are 85 °C, 140 °C, and 105 °C, and the time for each stage is 15 minutes.

[0082] Ceramization treatment: Treat the coated mica plate at 900 °C for 15 minutes and set aside.

[0083] Experiment 1: Expansion performance test Experiment description Experiment purpose Verify the influence of the expanded graphite ratio on the expansion performance of the ceramizable explosion-proof mica plate. By comparing Example 1 and Comparative Example 1, observe the effect of different expanded graphite contents on the high-temperature expansion thickness.

[0084] Experiment materials and equipment samples: Mica plate samples prepared in Example 1 and Comparative Example 1, 5 pieces in each group, with dimensions of 100 mm × 100 mm × 2 mm.

[0085] High-temperature furnace: The temperature control accuracy is ±5°C, and the maximum temperature is 1200°C.

[0086] Vernier caliper: The accuracy is 0.01 mm, used for measuring the expansion thickness.

[0087] Experimental procedures Sample preparation Number 5 samples each of Example 1 and Comparative Example 1, and record the initial thickness (2.0 mm).

[0088] High-temperature treatment Put the samples into the high-temperature furnace, set the temperature to 900°C, and the heating rate to 20°C / minute.

[0089] The samples are spaced 10 mm apart to ensure uniform heating of each sample.

[0090] Take out the samples after heat preservation for 5 minutes and quickly cool them to room temperature.

[0091] Thickness measurement Use a vernier caliper to measure the maximum thickness after expansion.

[0092] Measure each sample 3 times repeatedly and record the average value.

[0093] Data recording and processing Record the expansion thickness of each sample in a table and take the within-group average value for comparison.

[0094] Experimental data table: The expansion thickness of the mica plate in Example 1 at high temperature is significantly higher than that in Comparative Example 1, indicating that the optimization of the expanded graphite ratio plays a crucial role in the expansion performance. Expanded graphite can form a porous expanded structure through the layered exfoliation effect in a high-temperature environment, blocking the spread of flames and heat. However, a low ratio of expanded graphite is insufficient to produce an effective expansion effect, thus limiting the overall performance of Comparative Example 1.

[0095] The underlying mechanism of this difference can be explained from the thermal decomposition process of expanded graphite. Under high-temperature conditions, the release of interlayer gas in expanded graphite triggers intense expansion. However, if the ratio is too low (such as in Comparative Example 1), the gas release amount is insufficient, resulting in substandard thickness and density of the expanded layer. In contrast, the expanded graphite ratio in Example 1 is optimized, with a more significant expansion effect, filling the material gaps and improving the thickness and integrity of the overall expanded layer.

[0096] In addition, the synergistic effect of ammonium polyphosphate cannot be ignored. In Example 1, the balanced ratio of expanded graphite to ammonium polyphosphate ensured the dual effects of the carbonized layer and gas expansion, making the expanded layer not only thick enough but also have strong thermal insulation. In Comparative Example 1, the lack of expanded graphite led to a decrease in the formation efficiency of the expanded structure, and a complete and dense thermal protection layer could not be formed, thus limiting the improvement space of its material properties.

[0097] Experiment 2: Hot Press Strength Test Experiment Description Experiment Purpose Verify the influence of hot press pressure on the interlayer bonding strength inside the mica plate, and evaluate the compressive strength performance of the samples under different hot press pressure conditions by comparing Example 2 and Comparative Example 2.

[0098] Experimental Materials and Equipment Samples: Mica plates prepared in Example 2 and Comparative Example 2, 3 pieces in each group, with dimensions of 100mm×100mm×2mm.

[0099] Universal testing machine: Test the compressive strength of the samples, with an accuracy of 0.1MPa.

[0100] Knife-edge fixture: Fix the samples to prevent lateral slip.

[0101] Experimental Procedures Sample Preparation Select 3 samples each from Example 2 and Comparative Example 2, number them and record the initial thickness (2.0mm).

[0102] Clamp the Samples Place the samples between the fixtures of the universal testing machine to ensure that the samples are in full contact with the upper and lower fixtures without obvious deviation.

[0103] Adjust the loading device to ensure that the applied pressure acts vertically on the sample surface.

[0104] Testing and Loading Load uniformly at a rate of 1MPa / second until the samples are crushed or delaminated.

[0105] Record the maximum pressure value (unit: MPa) at which each sample is damaged.

[0106] Repeat the Test Repeat the test 3 times for each sample, and take the average value as the compressive strength of the sample.

[0107] Experimental Settings The experimental environmental temperature is 25℃±2℃, and the relative humidity is 50%±5%RH.

[0108] The samples are left standing for 24 hours before testing to ensure uniform release of internal stress.

[0109] Experimental data table: The compressive strength of Example 2 is much higher than that of Comparative Example 2, indicating that the optimization of the hot pressing pressure plays a key role in the interlayer bonding strength of the mica plate. Too low hot pressing pressure (Comparative Example 2) results in insufficient bonding between mica papers, large interlayer voids, and easy delamination failure under local stress. In Example 2, a pressure of 2.0 MPa ensures the tight bonding between layers and effectively improves the compressive properties of the material.

[0110] Mechanistically, the hot pressing pressure directly affects the internal microstructure of the material. In Example 2, the appropriate pressure (2.0 MPa) makes the expanded graphite and flame retardant more evenly distributed, and at the same time completes the softening and curing of chlorinated rubber under high temperature conditions, forming a stable bonding layer. This bonding layer not only enhances the interlayer adhesion of the mica plate but also optimizes the overall stress distribution of the material, avoiding local stress concentration. In Comparative Example 2, a pressure of 1.5 MPa is not sufficient to fully compact the interlayer structure, resulting in loose internal bonding and a significant decrease in compressive capacity.

[0111] In addition, the synergistic effect of expanded graphite and ammonium polyphosphate is more significant under high-pressure conditions. In Example 2, the filling efficiency of expanded graphite is higher under high-pressure conditions, forming a dense carbonized barrier layer with ammonium polyphosphate, which delays the failure point of the sample during the compression process. In Comparative Example 2, due to insufficient pressure, the filling effect of expanded graphite is poor, and the thickness of the carbonized layer is insufficient, making it difficult to effectively resist external stress, resulting in the deterioration of the overall compressive performance.

[0112] Experiment 3: Fire extinguishing performance test Experiment description Experiment purpose Verify the influence of the coating thickness on the fire extinguishing performance of the mica plate, and evaluate the effect of different coating thicknesses on the fire extinguishing time in a flame environment by comparing Example 3 and Comparative Example 3.

[0113] Experimental materials and equipment Samples: Mica plates prepared in Example 3 and Comparative Example 3, 3 pieces in each group, with dimensions of 150 mm × 150 mm × 2 mm.

[0114] Blowtorch: The output flame temperature is 950 °C, and the diameter is 15 mm.

[0115] Stopwatch: Record the time required for the flame to go out, with an accuracy of 0.01 s.

[0116] Measuring device: Used to fix the relative position of the mica plate and the blowtorch to ensure that the flame center acts stably on the sample surface.

[0117] Experimental procedure Sample preparation Select the mica plate samples prepared in Example 3 and Comparative Example 3, number them and record the coating thickness.

[0118] Check that there are no obvious cracks, bubbles or damages on the surface of the samples.

[0119] Experimental setup Fix the sample on the sample holder of the measuring device, and fix the blowtorch directly below the sample, 20 mm away from the sample surface.

[0120] Adjust the output flame of the blowtorch to make the flame temperature stable at 950 °C and the diameter about 15 mm.

[0121] Testing process Light the blowtorch so that the flame acts directly on the sample surface.

[0122] Start timing, observe the time required for the flame to go out, and record the time point when the flame disappears from the sample surface.

[0123] Repeat the test 3 times for each sample, and take the average value as the extinguishing time of the sample.

[0124] Experimental environment Keep the room temperature at 25 °C ± 2 °C and the relative humidity at 50% ± 5% RH.

[0125] The test interval for each sample is not less than 15 minutes to ensure that the surface temperature returns to room temperature.

[0126] Experimental data table: The extinguishing time of Example 3 is significantly shorter than that of Comparative Example 3, indicating that the optimization of the coating thickness has a significant impact on the fire extinguishing performance. The thicker coating (0.5 mm) expands rapidly under high temperature conditions, and the non-combustible gas released can effectively isolate the flame from oxygen and quickly extinguish the flame. While the thinner coating (0.3 mm) has less material and releases less gas, resulting in a significant extension of the extinguishing time and a significant weakening of the extinguishing effect.

[0127] Mechanistically, high-temperature resistant silicone rubber and aerosol fire extinguishing powder are the key materials for coating fire extinguishing. The coating thickness directly affects the reaction amount and release efficiency of these two components. In Example 3, the thicker coating stores more fire extinguishing components, which can quickly release a large amount of non-combustible gas under the action of fire, and at the same time form an expanded isolation layer, effectively blocking the contact between the flame and oxygen. In Comparative Example 3, the coating thickness is insufficient, and the release amount of aerosol fire extinguishing powder is limited, and the flame cannot be extinguished in a short time, which directly leads to a significant extension of the fire extinguishing time. In addition, the expansion performance of the coating plays an important role in the fire extinguishing process. In Example 3, the thicker coating expands to about three times its thickness under high-temperature conditions, covering the surface of the sample and filling the area affected by the flame, greatly reducing the heat and oxygen transfer paths. This expansion barrier effect enhances the fire extinguishing performance. In Comparative Example 3, the insufficient coating thickness results in an insignificant expansion effect and a limited coverage area, allowing the flame to continue burning and significantly increasing the fire extinguishing time.

[0128] Experiment 4: Insulation Performance Test Experiment Description Experiment Purpose Verify the effect of the ammonium polyphosphate ratio on the insulation performance of mica plates, and evaluate the breakdown voltage performance of mica plates under different mixing ratios by comparing Example 4 and Comparative Example 4.

[0129] Experimental Materials and Equipment Samples: Mica plates prepared in Example 4 and Comparative Example 4, 5 pieces in each group, with dimensions of 100mm×100mm×2mm.

[0130] Voltage Withstand Tester: Voltage range 0 - 50kV, accuracy ±0.1kV.

[0131] Electrode Fixture: Diameter 10mm, ensuring uniform voltage distribution.

[0132] Experimental Procedures Sample Preparation Select the mica plates prepared in Example 4 and Comparative Example 4, number them and record the initial thickness.

[0133] Clean the surface of the samples, without bubbles, cracks or contamination.

[0134] Experimental Setup Place the sample in the middle of the electrode fixture, ensuring complete contact between the sample and the electrode surface.

[0135] Adjust the tester, set the initial voltage to 0kV, and gradually apply voltage.

[0136] Breakdown Test Increase the voltage uniformly at a rate of 1kV / s until the sample breaks down, and record the breakdown voltage value.

[0137] Each sample was tested 3 times and the average value was taken.

[0138] Experimental environment The room temperature was controlled at 25°C ± 2°C, and the relative humidity was maintained at 50% ± 5% RH.

[0139] Each sample was left standing for 24 hours before testing to ensure consistent test conditions.

[0140] Experimental data table: The breakdown voltage of Example 4 was significantly higher than that of Comparative Example 4, indicating that the optimization of the ammonium polyphosphate ratio significantly improved the insulation performance of the mica plate. An appropriate amount of ammonium polyphosphate in the examples could form a stable barrier layer under high-temperature or high-pressure environments, effectively preventing current from penetrating the material. In Comparative Example 4, due to the excessive content of ammonium polyphosphate, its uneven distribution in the material formed potential weak points, reducing the overall voltage resistance ability.

[0141] From the perspective of the material mechanism, the role of ammonium polyphosphate in the breakdown test was mainly reflected in its decomposition and film-forming ability under high-temperature conditions. In Example 4, a reasonable ratio ensured a uniform phosphate barrier layer, which had strong dielectric strength under high pressure and prevented current breakdown. In Comparative Example 4, the excessive ammonium polyphosphate led to phase separation during the material curing process, resulting in the formation of bubbles or microcracks in the mica plate locally, becoming leakage channels for current.

[0142] In addition, the difference in breakdown voltage was also closely related to the compactness of the mica plate. In Example 4, the synergistic effect of the hot pressing process and ammonium polyphosphate formed a tightly bonded mica paper layer structure, significantly reducing the microvoids in the material. This compactness improved the electrical impedance of the plate and ensured high insulation performance. In Comparative Example 4, the existence of local pores caused the electric field to be concentrated in the micropores, reducing the breakdown voltage of the material and thus affecting the overall performance.

[0143] Experiment 5: Testing of ceramization performance Experiment description Experiment purpose To verify the influence of the coating ratio on the ceramization performance of the mica plate, and to evaluate the hardness performance of the high-temperature ceramic layer of the mica plate under different coating component ratios by comparing Example 5 and Comparative Example 5.

[0144] Experimental materials and equipment Samples: Mica plates prepared in Example 5 and Comparative Example 5, 3 pieces in each group, with dimensions of 100 mm × 100 mm × 2 mm.

[0145] High-temperature furnace: Temperature control accuracy ±10°C, maximum temperature 1200°C.

[0146] Hardness tester: used to measure the surface hardness of the porcelainized layer (unit: MPa).

[0147] Metal bracket: used to fix the sample in the high-temperature furnace to ensure uniform heat treatment.

[0148] Experimental procedures Sample preparation Select the mica plate samples prepared in Example 5 and Comparative Example 5, number them and record the coating thickness.

[0149] Check that the surface of the sample has no cracks, bubbles or delamination.

[0150] High-temperature treatment Place the sample in the high-temperature furnace, set the temperature to 900 °C, and the heating rate to 10 °C / minute.

[0151] After holding for 15 minutes, take out the sample and slowly cool it to room temperature.

[0152] Hardness test Use the hardness tester to measure the hardness of the porcelainized layer on the surface of the sample after high-temperature treatment.

[0153] Test 3 different points on each sample, and take the average value as the hardness value of the sample (unit: MPa).

[0154] Experimental environment The room temperature is controlled at 25 °C ± 2 °C, and the relative humidity is maintained at 50% ± 5% RH.

[0155] The sample is left standing for 24 hours before testing to ensure the release of surface stress.

[0156] Experimental data table: The hardness of the porcelainized layer in Example 5 is significantly higher than that in Comparative Example 5, indicating that a reasonable coating ratio can effectively improve the high-temperature performance of the mica plate. The optimized ratio (65:35) of the high-temperature resistant silicone rubber and the aerosol fire extinguishing powder in the coating not only endows the coating with excellent adhesion performance, but also forms a dense and tough porcelainized layer in a high-temperature environment. In Comparative Example 5, due to the too high ratio of the aerosol fire extinguishing powder, the structural compactness and hardness of the coating under high-temperature action are significantly reduced.

[0157] Mechanistically, at a high temperature of 900 °C, the high-temperature resistant silicone rubber releases SiO2 particles through the thermal decomposition of silicon-oxygen bonds, and these particles will rearrange and sinter to form a preliminary ceramic layer. The main role of the aerosol fire extinguishing powder is to release non-combustible gases and enhance the heat insulation effect of the coating. However, when the ratio of the aerosol fire extinguishing powder is too high (such as in Comparative Example 5), an excessive pore structure will be generated during the sintering process, weakening the compactness and strength of the final porcelainized layer.

[0158] In addition, a reasonable proportion of silicone provides a better adhesion and flexibility basis during the initial curing of the coating and the high-temperature sintering process. In Example 5, the coating gradually changes from flexible to hard ceramic under high-temperature conditions, and a continuous silicon-oxygen network structure is formed inside, ensuring the uniformity of high-temperature hardness. In Comparative Example 5, due to the excessive proportion of aerosol in the coating, the sintering points of the structure are unevenly distributed, resulting in brittle cracks in the ceramic layer and a decrease in local hardness, thus significantly reducing the overall hardness performance.

[0159] Although the embodiments of the present invention have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A new energy power battery ceramic explosion-proof mica plate, characterized in that: Includes the following components: Mica paper substrate: 40-60 parts, as the main structural material; Chlorinated rubber: 10-20 parts, used to enhance flexibility and bonding properties; Ammonium polyphosphate: 3-8 parts, used as an intumescent flame retardant to form a carbonized layer; Expanded graphite: 3-8 parts, used to form an expanded heat-insulating structure at high temperatures; Titanium dioxide: 2 to 5 parts, used to improve the adhesion and heat resistance of the surface coating; Aluminum silicate fiber: 5-15 parts, providing high temperature ceramic support; Phosphate binder: 2-6 parts, used for high temperature chemical bonding and ceramicization; Alumina powder: 2 to 6 parts, used to increase the high temperature resistance hardness of the material; An intumescent fire extinguishing coating applied to the surface of a mica board, the coating comprising: High temperature resistant organic silica gel: 20-30 parts, used for stable support of the coating at high temperature; Aerosol fire extinguishing powder: 10 to 15 parts, used to release non-flammable gas at high temperature to extinguish fire.

2. The ceramic explosion-proof mica plate for new energy power battery according to claim 1 is characterized in that: The mass fraction of the chlorinated rubber is 15 to 18 parts, and is used to enhance the internal bonding force of the material during the hot pressing process.

3. The ceramic explosion-proof mica plate for new energy power battery according to claim 1 is characterized in that: The mass ratio of the ammonium polyphosphate to the expanded graphite is 1:1, in order to ensure the uniformity and fireproof performance of the expanded layer.

4. The ceramic explosion-proof mica plate for new energy power battery according to claim 1 is characterized in that: The mass fraction of the titanium dioxide is 3 to 4 parts, and is used to optimize the smoothness and heat reflectivity of the coating.

5. The ceramic explosion-proof mica plate for new energy power battery according to claim 1 is characterized in that: The mass ratio of the high temperature resistant organic silica gel to the aerosol fire extinguishing powder in the expansion fire extinguishing coating is 2:1, so as to achieve the synergistic effect of expansion and fire extinguishing at high temperature.

6. A method for preparing a ceramic explosion-proof mica plate for a new energy power battery, according to any one of claims 1 to 5, characterized in that: The following steps are involved: (1) Preparation of treatment liquid: chlorinated rubber, ammonium polyphosphate, expanded graphite and titanium dioxide are mixed in proportion, ethanol or methanol solvent is added, and the stirring speed is 500-700 rpm for 60-80 minutes to obtain a uniform treatment liquid; (2) Mica paper impregnation: pass the mica paper through the treatment liquid impregnation device at a speed of 2-4 m / min to ensure uniform adsorption, and then dry it at 80-100°C for 10-15 minutes; (3) Lamination: stack the treated mica paper in layers and perform hot pressing for 30 to 50 minutes at a temperature of 180 to 260°C and a pressure of 1.9 to 2.6 MPa to obtain a base mica board; (4) Coating preparation: Mix high temperature resistant organic silica gel and aerosol fire extinguishing powder in proportion, stir at a speed of 600 to 700 rpm for 65 to 80 minutes to prepare a uniform intumescent fire extinguishing coating; (5) Coating and drying: The coating is evenly applied on the surface of the mica board using a gap coating process, with a coating thickness of 0.5±0.1mm and a coating speed of 6-8m / min, followed by curing under three-stage drying conditions: Zone 1: 80-100°C, 10-15 minutes; The second zone: 130-150℃, 10-15 minutes; Zone 3: 100-110°C, 15-20 minutes; (6) High temperature ceramic treatment: Treat at a high temperature of 800-1000°C for 10-20 minutes to obtain a dense ceramic layer on the surface.

7. The method for preparing a ceramic explosion-proof mica plate for a new energy power battery according to claim 6, characterized in that: The stirring speed of the treatment liquid is preferably 600 rpm, and the stirring time is preferably 70 minutes to ensure uniform dispersion of the ammonium polyphosphate and the expanded graphite.

8. The method for preparing a ceramic explosion-proof mica plate for a new energy power battery according to claim 6, characterized in that: The impregnation speed of the mica paper is preferably 3 m / min to ensure sufficient adsorption of the treatment liquid on the surface of the mica paper.

9. The method for preparing a ceramic explosion-proof mica plate for a new energy power battery according to claim 6, characterized in that: The hot pressing temperature is 220° C., the pressure is 2.3 MPa, and the time is 40 minutes to ensure high-strength bonding between mica paper layers.

10. The method for preparing a ceramic explosion-proof mica plate for a new energy power battery according to claim 6, characterized in that: The final thickness of the coating is 0.5 mm, and a multi-stage drying process is used to avoid cracks or bubbles and ensure coating adhesion and stability.

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