FUEL CELL SYSTEM

摘要

The invention relates to a fuel cell system (11, 111) comprising an anode chamber (13, 113) and a cathode chamber (14, 114) which are separated from each other by a proton conducting membrane (15, 115). When the fuel cell system is in operation, fuel, specially H2 or a water-methanol mixture, can be fed to the anode chamber and oxidator, specially oxygen, can be fed to the cathode chamber. In stand-by mode, the cathode chamber (14, 114) cannot be cross-flown and the oxidator and fuel are present in both the cathode chamber (14, 114) and the anode chamber (13, 113). The fuel cell system remains at operating temperature during said stand-by mode. This enables the fuel system (11) to be used as a combined interruption-free power supply unit and a back-up unit.