A motor-driven vehicle comprising: a first battery; a second battery; a voltage converter that includes a plurality of switching elements configured to perform bi-directional voltage conversion between an electric power output path and either one or both of the first battery and the second battery, and to switch the connection of the first battery and the second battery to the electric power output path between an in-series connection and an in-parallel connection; a vehicle drive motor connected to the electric power output path; and a control device configured to turn on and off the plurality of switching elements, wherein the electric power output path includes a first electric path and a second electric path, the second electric path having an electric potential lower than that of the first electric path, wherein the plurality of switching elements are configured as first to fourth switching elements, which are provided in series from the first electric path toward the second electric path, wherein the first battery is connected in parallel to the third switching element and the fourth switching element, wherein the second battery is connected in parallel to the second switching element and the third switching element, and wherein the control device is configured to switch a connection to at least one of a connection between the electric power output path and the first battery, a connection between the electric power output path and the second battery, and a connection between the first battery and the second battery, based on a switching element of the plurality of switching elements, the temperature of which exceeds a predetermined threshold, and an operating point of the motor. a first battery; a second battery; a voltage converter that includes a plurality of switching elements configured to perform bi-directional voltage conversion between an electric power output path and either one or both of the first battery and the second battery, and to switch the connection of the first battery and the second battery to the electric power output path between an in-series connection and an in-parallel connection; a vehicle drive motor connected to the electric power output path; and a control device configured to turn on and off the plurality of switching elements, wherein the electric power output path includes a first electric path and a second electric path, the second electric path having an electric potential lower than that of the first electric path, wherein the plurality of switching elements are configured as first to fourth switching elements, which are provided in series from the first electric path toward the second electric path, wherein the first battery is connected in parallel to the third switching element and the fourth switching element, wherein the second battery is connected in parallel to the second switching element and the third switching element, and wherein the control device is configured to switch a connection to at least one of a connection between the electric power output path and the first battery, a connection between the electric power output path and the second battery, and a connection between the first battery and the second battery, based on a switching element of the plurality of switching elements, the temperature of which exceeds a predetermined threshold, and an operating point of the motor.