Aerogel is a new type of lightweight solid material consisting of micro nano porous network structure formed by mutual aggregation of colloidal particles or polymer molecules, and filled with air dispersion medium in the pores. It has the characteristics of extremely low apparent density (as low as 0.002gcm-3), high porosity (80% -99.8%), high specific surface area (100-2000m2g-1), etc., which makes it have good barrier performance, extremely low thermal conductivity (0.01-0.04Wm-1K-1), and high adsorption, catalytic and loading capabilities. Therefore, aerogel is expected to be widely used as new energy vehicle heat insulation materials, heat insulation materials, flame retardant materials, sound insulation materials, efficient adsorption materials, catalyst carrier materials, optical devices and electrode energy materials, and is regarded as "one of the ten most promising materials in the future".
With the strong support of the country for the development of new energy vehicles, the production and sales of electric vehicles have grown rapidly, and the pace of industrialization is accelerating endlessly. At present, electric vehicles mainly use lithium-ion batteries as power batteries. After years of development, the safety of lithium-ion power batteries has made significant progress. However, under extreme conditions, lithium-ion batteries still pose risks of combustion and explosion. The application of aerogel materials further enhances the fire protection requirements of power batteries and ensures the safety of people's lives and wealth.
When a lithium electronic battery experiences an internal or external short circuit, the battery releases a large amount of heat in a short period of time, causing the temperature to rise sharply and leading to thermal runaway. The flammable liquid electrolyte ignites at high temperatures, causing the battery to catch fire. Through thermal diffusion, a single thermal runaway battery triggers thermal runaway of adjacent batteries through thermal conduction and flames, resulting in thermal runaway of the entire battery module/pack, leading to a fire and explosion event.
When the aerogel insulation sheet is applied to the lithium-ion power battery module, the low thermal conductivity can effectively prevent the heat dispersion of the battery cell caused by the rapid charging and discharging at a large rate; When the battery cell experiences thermal runaway, it can provide insulation and delay or prevent accidents from occurring; When the electric core overheats and burns, the performance of the aerogel heat insulation board reaching Class A incombustibility of the building can also effectively block or delay the spread of the fire, providing enough time for escape. Therefore, the aerogel film heat shield can play a very important role in improving the safety performance of the power battery pack of new energy vehicles.
In recent years, the problem of thermal runaway transmission in battery packs has mainly been addressed by adding insulation layers inside the battery pack to block the transmission of thermal runaway from the runaway cells to the surrounding areas, in order to reduce the damage and accompanying destructive effects of the battery pack. The commonly used thermal insulation materials for power batteries include foam, plastic foam, superfine glass wool, high silicon oxygen cotton, vacuum insulation board, silica gas gel, etc. The insulation board in the battery pack is a kind of thermal protection equipment that is placed between the individual cells and can effectively delay or block the spread of the thermal runaway of the individual cells to the entire battery system. Requires the following performance:
1. Flame retardant and heat-resistant.
2. Low thermal conductivity.
3. No toxic gases occur
4. Waterproof, moisture-proof, and shockproof
5. Light weight, low price, thin thickness.
Silica aerogel is a kind of porous solid material with gas as the separation medium, which is the lightest solid material used in engineering today. The thermal conductivity of the aerogel felt made from it is 0.020W/(m · K), or even lower, and it is super hydrophobic, Class A1 flame retardant, wide temperature range (-200~650 ℃), long life, compression resistant, and non-toxic. Compared with traditional thermal insulation materials, the thickness of aerogel material is only 1/2-1/5 of that of traditional thermal insulation materials under the same thermal insulation effect. Based on the above characteristics of aerogel and the demand for power battery insulation panel, aerogel film is considered to be the thinnest and most efficient thermal insulation material that can be applied to new energy vehicles and power batteries at present.
Silica aerogel is a kind of porous solid material with gas as the dispersion medium. It has the characteristics of low thermal conductivity, good thermal insulation effect, Class A fire prevention, light weight, etc. In recent years, aerogel materials have begun to be used in the field of fire protection and thermal insulation of power batteries. It is considered to be a thin insulation material that can be applied to new energy vehicles, new energy fire prevention, and power batteries. In the event of thermal runaway in the battery cell, it can effectively suppress thermal diffusion, and on the other hand, effectively reduce battery performance degradation in low-temperature environments, while saving more space for limited battery packs.
Air gel insulation pad New energy fire prevention:
Air gel heat insulation pad is a composite product of ultra-thin air gel felt and PET/PI film. The thermal conductivity at room temperature is less than 0.035W/m · K, and it is flame retardant and does not drop powder.
The aerogel heat insulation pad is applied between the electric cores in the new energy battery new energy fire protection package, which can effectively isolate the diffusion of heat to the surrounding electric cores and protect the normal operation of the surrounding electric cores in the case of thermal runaway of a single electric core; It also has insulation and buffering functions.
Product advantages:
Thermal insulation: The thermal conductivity at room temperature is 0.02W/(m · K), and the thermal insulation performance is 3-5 times that of traditional insulation materials.
Fireproof and Hydrophobicity: National Class A non combustible standard for building materials, with a hydrophobicity rate of ≥ 99%.
Lightweight and High Strength: The product has a density of around 200kg/m and has good flexibility and tensile strength.
Sound insulation and seismic resistance: The three-dimensional porous network structure effectively absorbs sound, reduces noise, buffers seismic resistance, and improves driving experience.
Durable weather resistance: Overall hydrophobic, not easy to disassemble and settle, with a service life of over 10 years, which is 3-5 times longer than traditional insulation materials.
Convenient construction: easy to process, complex processes can be completed using ordinary cutting tools.
Corrosion prevention: It can effectively prevent the penetration of liquid water and prevent corrosion under the insulation layer.
Health and Environmental Protection: This product has passed RoHS testing and does not contain any harmful substances to the human body.