Electric vehicle charging and discharging connector and charging and discharging control method and device

The invention provides an electric vehicle charging and discharging connector and a charging and discharging control method and device. The connector comprises a first resistor, a switch, an identification resistor and a connector body. The method comprises the following steps: when a power supply end is a power supply output end of a first electric vehicle, a connector is a vehicle-to-electric equipment connector, and a load is a charging input end of electric equipment, controlling the power supply output end of the first electric vehicle to output a voltage with a first voltage value; converting the voltage of the first voltage value into the voltage of a second voltage value through the vehicle-to-electric equipment connector; and after a first pulse width modulation signal returned by the electric equipment is detected, closing the switch, and enabling the power supply output end of the first electric vehicle outputs voltage of a third voltage value. According to the charging and discharging control meth