Power supply device and electric vehicle

The utility model provides a power supply device and an electric automobile, and relates to the field of V2V communication technology emergency charging. The power supply device comprises a main control unit, an auxiliary power supply unit, a DC/DC module unit, a discharge connector and a charge connector, the main control unit is electrically connected with the first end of the auxiliary power supply unit and the DC/DC module unit; the main control unit communicates with a charging and discharging vehicle, obtains at least one of the state of charge SOC before charging and discharging of thevehicle and the state of charge SOC in the charging process, and judges whether the vehicle is charged and discharged or not through the SOC. The power supply device provided by the utility model canjudge and control whether the automobile is charged and discharged or not according to the SOC, thereby avoiding the problems of malicious electricity stealing between electric automobiles and over-discharge of the discharged