Electric vehicle charging system is an energy supply facility to maintain the operation of electric vehicles. According to the charging pile system, it is divided into DC charging pile and AC charging pile. Dc charging pile is usually installed outside the electric vehicle and connected to the AC power grid, which can provide enough power, and the adjustment range of output voltage and current is also large, because DC charging pile adopts three-phase four-wire power supply. It can provide enough electric energy, and the output voltage and current adjustment range is large, which can meet the requirements of fast charging.

Under normal circumstances, fast charging is high-power DC charging, half an hour can fill 80% of the battery capacity, according to the power of the DC charging pile, due to different manufacturers, the power difference is different, according to the power of the charging pile, the ordinary DC charging pile power is about 30KW-120KW, and higher fast charging, such as Beijing new energy, according to the power of the charging pile, The power of different charging piles is different.

From the point of view of the actual charging power time, the maximum charging rate of the 60kW pile is 60 degrees/hour (1.0 degrees/min), that is, 1 degree per minute, which is determined according to the matching results of the battery parameters and the charging pile of the electric vehicle, and changes with the charging state. According to the power of charging pile 30kW, 60kW, 120k, charging pile is generally used for high-speed backbone network charging station.

For example, Jingneng New Energy 120kW DC integrated charging pile, single gun/double gun model (optional flexible distribution), DC output current up to 300A, full load conversion efficiency ≥95.5%, support power intelligent distribution, automatic matching charging demand power, wireless communication and other functions. It only takes 30 minutes to charge most new energy vehicles to more than 90% of the electricity, greatly reducing the waiting time of drivers and significantly improving the charging experience.

Charging piles with high voltage (750V) and the same or higher power (180kW/240kW) are generally used in urban bus terminal charging stations and large charging stations, which are mainly used for large vehicles. For integration, with the improvement of charging infrastructure, charging pile technology will usher in a higher standard. Previously, a joint venture automotive company planned to build high-voltage fast charging and charging equipment to meet the use of future products.