Preparation method of novel phase change aerogel heat insulation pad

Abstract

The invention discloses a preparation method of a novel phase change aerogel heat insulation pad, which comprises the following steps: A, at a certain temperature, adding a phase change material, a heat conduction material, an opacifying agent and a flame retardant into a beaker according to a certain proportion, and uniformly stirring; b, immersing a base material into the solution to obtain a phase change aerogel heat insulation pad; c, combining the phase change material with the silicon dioxide aerogel heat insulation pad by utilizing a sandwich structure; d, the phase-change aerogel heat insulation pad of a novel structure is obtained after packaging is conducted through a packaging material, and the phase-change material is prepared from, by weight, 8-12 parts of paraffin, 8-12 parts of octadecanol, 8-12 parts of polyethylene glycol, 8-12 parts of silica sol, 8-12 parts of calcium chloride hexahydrate, 8-12 parts of sodium sulfate decahydrate, 8-12 parts of sodium hydrogen phosphate decahydrate, 8-12 parts of barium hydroxide octahydrate and 8-12 parts of magnesium chloride hexahydrate. And 6-10 parts of octadecanol. The base material, the phase change material, the heat conduction material, the opacifying agent and the flame retardant are adopted as raw materials, and the prepared heat insulation pad has good inhibiting and delaying effects on thermal runaway in the battery module.

Description

Technical Field

[0001] The invention relates to the technical field of thermal insulation pads, and in particular to a method for preparing a novel phase change aerogel thermal insulation pad. Background Art

[0002] In recent years, the energy crisis and the intensification of environmental pollution have promoted the vigorous development of electric vehicles. Power batteries are important components for providing power for electric vehicles. Lithium-ion batteries have the advantages of high energy density, long cycle life, and no memory effect. They are widely used in electric vehicles. However, the performance of battery packs is highly sensitive to temperature. The suitable operating temperature of lithium-ion batteries is between 25℃ and 50℃, and the suitable temperature difference is less than 5℃. However, the charging and discharging process of the battery is a typical heat generation process. If the heat cannot be dissipated quickly, the high temperature will affect the performance and service life of the battery. What is more serious is that fire or even explosion may occur, posing a threat to daily life. Therefore, an efficient battery thermal management system is developed to ensure the safety of the battery.

[0003] In the development process of phase change materials, people have conducted in-depth research on a variety of materials, including inorganic compounds (salts and hydrated salts) and organic compounds, such as paraffin, fatty acids and polyethylene glycol. Phase change materials meet the required thermophysical and chemical properties, such as suitable phase change temperature, high energy storage density, good thermal conductivity, leakage prevention, shape stability, and good chemical stability and cycle stability.

[0004] Therefore, applying phase change materials in thermal management systems is an effective way to prevent thermal runaway. When battery thermal runaway occurs, the phase change material quickly absorbs part of the heat by utilizing the thermal conductivity of the thermal conductive material, and cooperates with the sunscreen and flame retardant to fight thermal runaway, prevent thermal runaway or prolong the time of thermal runaway, and extend the escape time for the people on the vehicle. At the same time, the silica aerogel insulation pad has good thermal insulation properties, ultra-low thermal conductivity, and double-layer protection can more effectively control thermal runaway, prolong the escape time, and thus reduce casualties. Summary of the invention

[0005] The purpose of the present invention is to provide a novel method for preparing a phase change aerogel thermal insulation pad to solve the problems raised in the above background technology.

[0006] To achieve the above object, the present invention provides the following technical solution: a method for preparing a novel phase change aerogel thermal insulation pad, comprising the following steps:

[0007] A. At a certain temperature, add phase change material, thermal conductive material, sunscreen and flame retardant into a beaker in a certain proportion and stir evenly;

[0008] B. Immersing the substrate into the solution to obtain a phase change aerogel thermal insulation pad;

[0009] C. Use a sandwich structure to combine phase change materials with silica aerogel insulation pads;

[0010] D. After packaging with packaging materials, a phase change aerogel thermal insulation pad with a new structure is obtained.

[0011] Preferably, the phase change material is composed of paraffin, octadecyl alcohol, polyethylene glycol, silica sol, calcium chloride hexahydrate, sodium sulfate decahydrate, sodium hydrogen phosphate decahydrate, barium hydroxide octahydrate and magnesium chloride hexahydrate, and its components in weight parts are: 8-12 parts of paraffin; 6-10 parts of octadecyl alcohol; 7-11 parts of polyethylene glycol; 5-10 parts of silica sol; 3-6 parts of calcium chloride hexahydrate; 4-7 parts of sodium sulfate decahydrate; 2-5 parts of sodium hydrogen phosphate decahydrate; 4-10 parts of barium hydroxide octahydrate; 8-16 parts of magnesium chloride hexahydrate.

[0012] Preferably, the particle size of the thermal conductive material is 50-100 μm, and the thermal conductive material is composed of copper powder, carbon powder, aluminum nitride and silicon carbide, and its components in weight parts are: 10-15 parts of copper powder; 6-12 parts of carbon powder; 7-13 parts of aluminum nitride; 8-14 parts of silicon carbide.

[0013] Preferably, the sunscreen is composed of titanium dioxide, zinc oxide and potassium hexatitanate whiskers, and the weight proportions of the components are: 10-15 parts of titanium dioxide; 8-12 parts of zinc oxide; and 9-14 parts of potassium hexatitanate whiskers.

[0014] Preferably, the flame retardant is composed of magnesium hydroxide and aluminum hydroxide, and the weight proportions of the components are: 10-15 parts of magnesium hydroxide; 12-18 parts of aluminum hydroxide.

[0015] Preferably, the thickness of the substrate is 1mm-5mm, the porosity of the substrate is 80%-90%, the substrate is composed of ceramic fiber, glass fiber and foam, and the weight proportions of the components are: 10-15 parts of ceramic fiber; 8-12 parts of glass fiber; 6-10 parts of foam.

[0016] Preferably, the thermal insulation pad is ceramic fiber aerogel, wet glass fiber aerogel, pre-oxidized silk aerogel or foam aerogel.

[0017] Preferably, the stirring time is 1-3h.

[0018] Preferably, the packaging material is one of aluminum-plastic film, nylon film, polyethylene film or polyvinyl chloride film, and the thickness of the packaging material is 0.05 mm-0.25 mm.

[0019] Compared with the prior art, the present invention has the following beneficial effects:

[0020] The present invention adopts a substrate, a phase change material, a heat conductive material, a sunscreen and a flame retardant as raw materials, and the prepared heat insulation pad has a good inhibitory and delaying effect on thermal runaway in a battery module. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a real picture of the phase change aerogel thermal insulation pad of the present invention. DETAILED DESCRIPTION

[0022] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] See also Figure 1 , a novel method for preparing a phase change aerogel thermal insulation pad comprises the following steps:

[0024] A. At a certain temperature, add phase change material, thermal conductive material, sunscreen and flame retardant into a beaker in a certain proportion and stir evenly;

[0025] B. Immersing the substrate into the solution to obtain a phase change aerogel thermal insulation pad;

[0026] C. Use a sandwich structure to combine phase change materials with silica aerogel insulation pads;

[0027] D. After packaging with packaging materials, a phase change aerogel thermal insulation pad with a new structure is obtained.

[0028] The phase change material is composed of paraffin, octadecyl alcohol, polyethylene glycol, silica sol, calcium chloride hexahydrate, sodium sulfate decahydrate, sodium hydrogen phosphate decahydrate, barium hydroxide octahydrate and magnesium chloride hexahydrate, and its components in weight parts are: 8-12 parts of paraffin; 6-10 parts of octadecyl alcohol; 7-11 parts of polyethylene glycol; 5-10 parts of silica sol; 3-6 parts of calcium chloride hexahydrate; 4-7 parts of sodium sulfate decahydrate; 2-5 parts of sodium hydrogen phosphate decahydrate; 4-10 parts of barium hydroxide octahydrate; 8-16 parts of magnesium chloride hexahydrate.

[0029] The particle size of the thermal conductive material is 50-100 μm. The thermal conductive material is composed of copper powder, carbon powder, aluminum nitride and silicon carbide, and the weight proportions of the components are: 10-15 parts of copper powder; 6-12 parts of carbon powder; 7-13 parts of aluminum nitride; and 8-14 parts of silicon carbide.

[0030] The sunscreen agent is composed of titanium dioxide, zinc oxide and potassium hexatitanate whisker, and its components in weight parts are: 10-15 parts of titanium dioxide; 8-12 parts of zinc oxide; and 9-14 parts of potassium hexatitanate whisker.

[0031] The flame retardant is composed of magnesium hydroxide and aluminum hydroxide, and the weight proportions thereof are: 10-15 parts of magnesium hydroxide and 12-18 parts of aluminum hydroxide.

[0032] The thickness of the substrate is 1mm-5mm, the porosity of the substrate is 80%-90%, the substrate is composed of ceramic fiber, glass fiber and foam, and the weight proportions thereof are: 10-15 parts of ceramic fiber; 8-12 parts of glass fiber; and 6-10 parts of foam.

[0033] The thermal insulation pad is ceramic fiber aerogel, wet glass fiber aerogel, pre-oxidized silk aerogel or foam aerogel.

[0034] The stirring time is 1-3h.

[0035] The packaging material is one of aluminum-plastic film, nylon film, polyethylene film or polyvinyl chloride film, and the thickness of the packaging material is 0.05mm-0.25mm.

[0036] Thermal Insulation Data Sheet

[0037]

[0038] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A novel method for preparing a phase change aerogel thermal insulation pad, characterized in that: The following steps are involved: A. At a certain temperature, add phase change material, thermal conductive material, sunscreen and flame retardant into a beaker in a certain proportion and stir evenly; B. Immersing the substrate into the solution to obtain a phase change aerogel thermal insulation pad; C. Use a sandwich structure to combine phase change materials with silica aerogel insulation pads; D. After packaging with packaging materials, a phase change aerogel thermal insulation pad with a new structure is obtained.

2. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The phase change material is composed of paraffin, octadecyl alcohol, polyethylene glycol, silica sol, calcium chloride hexahydrate, sodium sulfate decahydrate, sodium hydrogen phosphate decahydrate, barium hydroxide octahydrate and magnesium chloride hexahydrate, and its components in parts by weight are: 8-12 parts of paraffin; 6-10 parts of octadecyl alcohol; 7-11 parts of polyethylene glycol; 5-10 parts of silica sol; 3-6 parts of calcium chloride hexahydrate; 4-7 parts of sodium sulfate decahydrate; 2-5 parts of sodium hydrogen phosphate decahydrate; 4-10 parts of barium hydroxide octahydrate; and 8-16 parts of magnesium chloride hexahydrate.

3. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The particle size of the thermal conductive material is 50-100 μm, and the thermal conductive material is composed of copper powder, carbon powder, aluminum nitride and silicon carbide, and the weight proportions thereof are: 10-15 parts of copper powder; 6-12 parts of carbon powder; 7-13 parts of aluminum nitride; 8-14 parts of silicon carbide.

4. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The sunscreen agent is composed of titanium dioxide, zinc oxide and potassium hexatitanate whiskers, and the weight proportions thereof are: 10-15 parts of titanium dioxide; 8-12 parts of zinc oxide; 9-14 parts of potassium hexatitanate whiskers.

5. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The flame retardant is composed of magnesium hydroxide and aluminum hydroxide, and the weight proportions of the components are: 10-15 parts of magnesium hydroxide and 12-18 parts of aluminum hydroxide.

6. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The thickness of the substrate is 1mm-5mm, the porosity of the substrate is 80%-90%, and the substrate is composed of ceramic fiber, glass fiber and foam, and the weight proportion of the components is: 10-15 parts of ceramic fiber; Glass fiber 8-12 parts; 6-10 parts of foam.

7. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The thermal insulation pad is ceramic fiber aerogel, wet glass fiber aerogel, pre-oxidized silk aerogel or foam aerogel.

8. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The stirring time is 1-3h.

9. The method for preparing a novel phase change aerogel thermal insulation pad according to claim 1, characterized in that: The packaging material is one of aluminum-plastic film, nylon film, polyethylene film or polyvinyl chloride film, and the thickness of the packaging material is 0.05mm-0.25mm.

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