FUEL CELL SYSTEM

PROBLEM TO BE SOLVED: To stabilize an output of each cell at start-up of a fuel cell system. SOLUTION: The fuel cell system 10 is provided with a membrane electrode assembly with an anode and a cathode jointed to an electrolyte film, a fuel cell stack 20 including a laminate with a combination of a fuel flow channel plate, an oxidant flow channel plate, and a cooling water flow channel plate, a piping 80 as well as a circulation pump 90 necessary for circulating cooling water by putting in the same exhausted from the fuel cell stack back to the stack after cooling it, a fuel humidifier 40 humidifying fuel by heat exchange with the cooling water, an air humidifier 60 likewise humidifying air, and a control part 100 having circulation of the cooling water continued until a given cooling stop condition becomes valid, supply of at least either the fuel or the air continued, a load current gradually decreased from system stoppage, and the load current interrupted when the given cooling stop condition becomes valid, at stoppage of the system. COPYRIGHT: (C)2006,JPO&NCIPI