FUEL CELL SYSTEM AND OPERATION METHOD THEREOF

A fuel cell system and a method for operating the fuel cell system, wherein the fuel cell system includes a fuel cell, a controller, a switch, an oxygen supply device and an output circuit. The fuel cell includes an anode and a cathode. The fuel cell is a cathode enclosed fuel cell. The controller is used to drive control signal for adjusting the electrochemical metering ratio of oxygen flow, supplied by the oxygen supply device, to output current, wherein the electrochemical metering ratio is ‘a’, and ‘a’ satisfies: 1≤a≤4. The method of the present disclosure uses the fuel cell system of the present disclosure, which optimizes the performance of a fuel cell and makes the output interruption time very short; hence it is highly beneficial for providing a more stable output.