The chassis of pure electric vehicle is mainly made of LiFePO4 Battery. Lead Acid Battery is mature electric vehicle battery. It is reliable, easy to get raw materials and cheap, can meet the power requirements of electric vehicles basically. LiFePO4 battery has more mature technology, higher safety, lower price than three-yuan lithium ion battery, it has larger working temperature range, longer service life. In the previous period, the LiFePO4 battery became the mainstream power type lithium battery used in pure electric sanitation vehicles.