Application of aerogel insulation materials in transportation
Application of aerogel insulation materials in transportation
With the continuous improvement of the performance of the EMU, the structure and materials of the car body also have a series of changes. These changes will have a certain influence on the heat insulation performance of the EMU body. The heat insulation performance of the top board of the EMU is one of the main factors that affect the heat transfer of the car body. The study of the influence of different roof structures on the heat insulation performance is important for the analysis of the energy consumption, the determination of the air conditioning load, the avoidance of the bad working conditions (the inner wall condensation, the high local temperature), and the maintenance of the comfortable heat environment in the car. The meaning of it. In the field of new energy vehicles, fire and explosion accidents of electric vehicles caused by "thermal runaway" of lithium-ion batteries have been reported frequently. How to effectively ensure the heat dissipation and safety of lithium-ion batteries has become the "sword of Damocles" hanging over the heads of vehicle factories and power battery enterprises.
Whether the electric vehicle can run normally and safely in the hot winter weather has a great relationship with the power battery installed on the vehicle. The characteristics of power battery are deeply affected by temperature factors, and the discharge efficiency varies with temperature, thus affecting the performance of electric vehicles. At present, the operating temperature range of lithium battery is -20 degrees -60 centigrade. In a low temperature environment, the endurance of electric vehicles will be reduced significantly, and more than half a mileage is lost, and it is also difficult to recharge the "cold" battery. If the temperature reaches zero degrees Celsius, the mileage of electric vehicles will even be reduced by 30% than normal. In addition, if the temperature of the battery is too low, it will also affect the performance of the regenerative braking system. The regenerative braking system is to use the power of the brake to charge the battery to improve the mileage. However, if the regenerative braking system inputs too much power to the vehicle battery, it will damage the battery at low temperature. The aerogel thermal insulation material has the characteristics of low thermal conductivity, good thermal insulation effect, a high fire resistance, thin thickness, light quality, easy to use and so on. It can solve the problem of low temperature of the new energy car battery pack. Only the thickness of the traditional material 1/5~1/3 can achieve the same thermal insulation effect, save more space for the space limited battery pack, the same thickness is more durable than the traditional material. It is very good to solve the problem of cold winter, new energy battery pack endurance, improve the efficiency of power use and can also be extended. The service life of the battery pack.
In the case of high temperature, if there is no appropriate heat dissipation scheme, there will be a large difference in the temperature of the battery pack, which will affect the consistency of the cell monomer and cause a series of subsequent problems. The most serious problem is that the battery overcharge leads to "thermal runaway", which causes electric vehicles to catch fire and explode. Aerogel material itself has a class a fire protection function. When new energy vehicles fire out of "heat out of control", it can also play a very good thermal protection effect, which will win more time for passengers to escape or extinguish the fire, and then reduce the loss. In one word, electric cars with good battery temperature control and electrical control can make the car cool in summer, safer and longer endurance and longer service life. In the winter, the electric car with poor management will be "sick", and the possibility of "explosion at any time" in summer is also possible.
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