FUEL CELL SYSTEM

PROBLEM TO BE SOLVED: To provide a fuel cell system capable of simplifying a structure sealing a cathode, in one equipped with a drain channel evacuating product water. SOLUTION: The fuel cell system is provided with a drain channel (drain pipes 26, 27 and a drain path 10c) evacuating product water from a cathode, and a connection portion S connecting the drain channel to a flow channel at a downstream of a humidifier 23 in an evacuation side of oxidant gas pipes L4 to L7. A first switching valve 22 is set at an upstream of the humidifier 23, a second switching valve 24 is set at a downstream of the connection portion S, and product water is made enabled to be evacuated by pressure difference between a pressure in the drain channel and pressure of a flow channel on the evacuation side of the oxidant gas pipes L4 to L7. COPYRIGHT: (C)2010,JPO&INPIT