Patent ID: 7687172

Claim:
A fuel cell system comprising: a fuel cell stack formed by stacking a plurality of fuel cells in a stacking direction, said fuel cells each including an electrolyte electrode assembly and separators sandwiching said electrolyte electrode assembly, said electrolyte electrode assembly including an anode, a cathode, and an electrolyte interposed between said anode and said cathode; a heat exchanger for heating an oxygen-containing gas to be supplied to said fuel cell stack; a reformer for reforming a fuel to produce a fuel gas; and a casing containing said fuel cell stack, said heat exchanger, and said reformer, wherein a fluid unit including at least said heat exchanger and said reformer is provided on one side of said fuel cell stack in said casing, heat exchange between an exhaust gas discharged from said fuel cell stack and the oxygen-containing gas is performed at said heat exchanger, and after the heat exchange, the oxygen-containing gas is supplied to said fuel cell stack, and said reformer is heated by the exhaust gas discharged from said heat exchanger.