Fuel cell system and driving method thereof

The present invention can reduce the amount of operation of the fuel cell system and provides a driving method of a fuel cell system capable of increasing the life. Method of driving a fuel cell system according to the present invention applies a predetermined voltage applied to the load system and a method of driving a fuel cell system including a fuel cell section and if the second leg. Detecting a voltage applied to the load to be applied to the system, and compares the detected applied voltage and a predetermined reference voltage. If the comparison result is less than the reference voltage is a voltage and drives a secondary battery, and drive voltage is applied to parts of the fuel cell is greater than the reference voltage. And compares the SOC and the reference remaining capacity detection and detect the remaining capacity of the secondary battery while the secondary battery land driving. If the remaining capacity is less than the reference SOC by actuating the fuel cell to charge a secondary battery. And it compares the detected charging amount of the secondary battery to be charged is detected based on the charge capacity and charge capacity to stop the charging of the secondary battery using the fuel cell portion is greater than the charge capacity based on the charge capacity. Fuel cells, secondary cells