The difference between electric vehicles and traditional fuel vehicles lies in the power part, which is also the core part of electric vehicles. Pure electric vehicle systems usually include three systems, namely the electric drive subsystem, the main energy subsystem and the auxiliary control subsystem. Among them, the electric drive subsystem consists of an electronic controller, a power converter, an electric motor, a mechanical transmission device and drive wheels; the main energy subsystem consists of a main power supply, an energy management system and a charging system; the auxiliary control subsystem has functions such as power steering, temperature control and auxiliary power supply.