The frequent fire accident in electric vehicles in summer is that it is too afraid of heat

Since the beginning of this year, the electric vehicle market is extremely hot. In addition to the hot sales, the fire accident is also quite hot. The video of electric vehicles on the Internet has been exposed. Why is the electric vehicle so easy to get angry in summer? Because it is too afraid of heat.

The battery of electric vehicles can be described as cold and hot. In the cold weather, the battery life of the car is just reduced, and the hot weather will cause an electric vehicle to fire. The danger is even more dangerous. As a result, the result is caused by the characteristics of the battery itself.

Most of the batteries used by electric vehicles are lithium iron phosphate batteries and ternary lithium batteries. Most of its internal electrolytes are composed of flammable and volatile non -aqueous solutions. This non -aquatic solution is easily volatile at high temperature to generate gas, so Generally speaking, the working temperature of the battery is not higher than 60 degrees. The maximum working temperature of the battery supplied by LG chemistry to Tesla does not exceed 65 degrees.

The diaphragm inside the battery is to separate the positive and negative poles of the battery, which can ensure the safety of the battery. Gas causes the internal deformation of the battery to destroy the diaphragm. Once the diaphragm is destroyed, the short circuit inside the power battery will quickly release more thermal energy, which will cause the battery to fire.

These characteristics of diaphragm and electrolyte are also important reasons for electric vehicles to be afraid of impact, because impact may cause the battery to distort, and then destroy the diaphragm. The reason for the speed of spreading speed is also the reason why electric vehicles are difficult to extinguish after the fire. It contains huge energy and oxidant. Even if the external air is isolated from the outside, it can continue to burn by the internal oxidant.

This summer, there are few hot weather in the country, and there are many cities with a temperature of more than 40 degrees. However, for electric vehicles, its working environment is actually worse. high.

It is reported that the surface temperature of Turpan this year has reached 70 degrees, and the surface temperature of Guangzhou has also reached 59 degrees. The temperature in the car stopped in the sun in the sun is even more high -temperature measured by netizens. It is far beyond the temperature, which is also the reason for the significant increase in the fire accident in summer. In addition, this has also reached nearly 8 million in the current size of the electric vehicle. In addition, the early electric vehicles have been used for more than 6 years, and aging has also caused an increase in fire in electric vehicles.

In order to ensure the safety of power batteries, automobile companies have made enough cooling measures for power batteries, asking it to provide cooling solutions such as liquid cooling, and at the same time, they also take sufficient measures in blocking the invasion of the outside. Enterprises are trying to pursue long battery life, leaving the space for these heat dissipation systems and protective systems are actually quite limited. It is often difficult to ensure that the battery work temperature is safe in cool weather. This appears that electric vehicles are hot in winter and summer. In the case of the car, the hot car in winter is to increase the temperature of the battery as soon as possible to reach the appropriate working temperature. In summer, the hot car is to reduce the battery temperature to reduce the battery temperature.

People in the industry also pointed out that when using electric vehicles, avoid rapid acceleration and rapid deceleration operations, because this operation will cause the current of electric vehicles to increase the current and increase heat. In particular, this type of operation should be avoided in cool weather; Once the battery cooling system of electric vehicles is found, you need to find 4S shop repair as soon as possible. When running long distances, you should not stop until the charging pile will be charged immediately, but wait for a period of time to reduce the battery temperature before charging. Beyond 10%, because some of the electricity is left for the cooling system to play a role.

In short, the use of electric vehicles is far from the media described as simple as the media. Even it needs to pay more attention to more than fuel vehicles. Therefore, industry insiders are called electric cars. Violent driving is actually very unsuitable for electric vehicles.

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