Direct current charging system and method

The invention relates to a direct-current charging system and method, the direct-current charging system comprises a direct-current charging device and a vehicle, the vehicle comprises a BMC, a DCDC, a power battery and a storage battery, and the direct-current charging device is used for providing first low-voltage direct current for the BMC and the DCDC and providing high-voltage direct current for the DCDC and the power battery; the BMC is used for pre-charging after being powered and sending a working instruction to the DCDC when it is determined that pre-charging is completed; and the DCDC is used for converting the high-voltage direct current into second low-voltage direct current to charge the storage battery if the working instruction is received after the DCDC is powered by the first low-voltage direct current. Therefore, the storage battery can be charged while the power battery is subjected to high-voltage charging, so that the user experience of the vehicle can be effectively improved. 本公开涉及一种直流充电