Electric mobile charging vehicle power supply method and service capacity calculation method

The invention relates to an electric mobile charging vehicle power supply method which is applied to a mobile charging vehicle including a power electric power supply system and an energy supplementation electric power supply system. Switching of electric power supply batteries is conducted through the method based on a selected working mode. Working modes comprise the range increasing mode and the energy increasing mode. In the energy increasing mode, switching of the electric power supply batteries is that charging electric energy is provided for an exterior electric vehicle through the power batteries of the mobile charging vehicle; and in the range increasing mode, switching of the power supply batteries is that electric energy is provided for a load of the mobile charging vehicle through the energy loading batteries. The invention further provides an electric mobile charging vehicle service capacity calculation method. By adoption of the electric mobile charging vehicle power supply method and service capacity calculation method, mutual use of the two kinds of electric power supply batteries is achieved, tradeoff setting between the service electric quantity and the service radius can be freely achieved, and flexibility of service capacity configuration of the mobile charging vehicle is improved.