The function of the charging pile is similar to the tanker in the gas station, which can be fixed on the ground or wall, and installed in public buildings (public buildings, shopping malls, public parking lots, etc.) and residential community parking lots or charging stations. Charging for various models of electric vehicles. The input end of the charging pile is directly connected to the AC grid. The output end is equipped with a charging plug for charging for electric vehicles. The charging pile generally provides two charging methods: conventional charging and fast charging. People can use a specific charging card to use the card to use the card on the human -computer interaction interface provided by the charging pile, and perform the corresponding charging method, charging time, cost data printing and other operations. The charging pile display can display data such as charging volume, cost, charging time.