Charging equipment is the most important supporting equipment for electric vehicles and is currently the biggest constraint to the promotion of electric vehicles. According to the charging speed and charging scale of power batteries, there are four main charging methods for electric vehicles at present: slow charging (AC charging pile), fast charging (DC charging station), battery replacement (switching station), and wireless charging.

Fast charging generally adopts DC charging method, mostly accessing a 380V power supply, with a high supply current and short charging time, which can fully charge 60%-80% of battery power within 20-30 minutes. DC fast charging has high requirements for the power grid and requires the construction of a dedicated network.