The present application relates to the technical field of
new energy vehicles, in particular to a vehicle low-
voltage power supply
system and an
electric vehicle. The present application comprises a storage battery and a DC / DC, one end of the DC / DC is used for connecting a
power battery, the other end is connected with the storage battery and a low-
voltage load, and is used for charging the storage battery and supplying power to the low-
voltage load. The storage battery is connected with emergency loads and 24-hour
constant power equipment through a low-voltage power supply circuit. If the
power battery and the DC / DC are normal, the DC / DC converts high-voltage
direct current of the
power battery into low-voltage
direct current to supply power to the low-voltage load. If the power battery or the DC / DC fails, the storage battery supplies power to the emergency loads and the 24-hour
constant power equipment. The present application not only ensures normal power supply to the emergency loads and the 24-hour
constant power equipment of the vehicle, guarantees the stability and reliability of the low-voltage power supply of the vehicle, but also has low
system cost and simple structure.