The statistical probability of auto-ignition of vehicles equipped with NCM8 1 1 batteries of Contemporary Ampere Technology Co., Ltd. is about 0.0072%. It needs to be clear that the spontaneous combustion rate is only a statistical data, which cannot be directly used to accurately predict individual vehicles or specific situations. The risk of spontaneous combustion of electric vehicles is affected by many factors. Including but not limited to battery quality, design and manufacturing process, charge and discharge management system, vehicle use environment, driver behavior, etc.