Low-voltage power supply device of vehicle and vehicle

The utility model discloses a low-voltage power supply device of a vehicle and the vehicle. The low-voltage power supply device comprises a DC/DC conversion circuit, a storage battery, a current sensor and a current processing circuit, wherein the high-voltage end of the DC/DC conversion circuit is used for being connected with a high-voltage power supply of the vehicle, the negative electrode of the low-voltage end of the DC/DC conversion circuit is grounded, the positive electrode of the storage battery is connected with the positive electrode of the low-voltage end of the DC/DC conversion circuit and used for being connected with the positive power supply end of a low-voltage load of the vehicle, and the negative electrode of the storage battery is connected with the negative power supply end of the low-voltage load through the current sensor. The current processing circuit is connected with the current sensor and used for being connected with a vehicle control unit of the vehicle so as to obtain charging