DC charging piles are fast charging.
It is a power supply device that is fixed outside the electric vehicle, connected to the AC power grid, and can provide DC power supply for the power battery of the off-board electric vehicle, which can provide sufficient power to achieve the requirements of fast charging.
AC electric vehicle charging pile, commonly known as "slow charging", is a power supply device that is fixedly installed outside the electric vehicle, connected to the AC power grid, and provides AC power for the on-board charger of the electric vehicle (that is, the charger fixed on the electric vehicle). It is equivalent to just playing the role of controlling the power supply.
To put it simply, AC charging piles need to be charged with the help of on-board chargers, DC fast charging piles do not need this equipment, the two are quite different in charging speed, a pure electric vehicle (ordinary battery capacity) is fully discharged through the AC charging pile It takes 8 hours, and only 1 to 3 hours through the DC fast charging pile.
AC charging pile to the electric vehicle charger to provide power input, because the power of the on-board charger is not large, so can not achieve fast charging, DC fast charging pile is fixed installed outside the electric vehicle, connected with the AC power grid, can provide DC power supply for the power battery of non-vehicle electric vehicle power supply device, DC charging pile can provide sufficient power, output voltage and current adjustment range is large, can achieve the requirements of fast charging.