Power batteries are electrochemical products, that is, battery is dangerous goods. However, the level of dangerous goods is relatively low, and international organizations have classified it as dangerous goods. Power battery grade is dangerous goods of grade eighth, ninth. Compared with bombs, firecrackers, gasoline and diesel oil, it will not explode or fire in the normal condition. However, when the power battery is installed on the vehicle, its environment has changed a lot, and the frequency of automobile safety accidents is still very high.