Patent ID: 8394546

Claim:
A fuel cell system comprising: a fuel cell for causing reactant gas to be electrochemically reacted to generate power when reactant gas is supplied; a reactant gas supply path for supplying reactant gas to the fuel cell; a reactant gas recirculation path for recirculating exhaust gas discharged from the fuel cell and combining the recirculating exhaust gas with reactant gas flowing through the reactant gas supply path to the fuel cell; a pump unit disposed in the reactant gas recirculation path to pump the recirculating exhaust gas through the reactant gas recirculation path; a pump-tempering apparatus for increasing the temperature of the pump unit; and a controller for controlling the pump-tempering apparatus; wherein the controller is programmed to receive a fuel cell system stop signal and to then control the pump-tempering apparatus such that the temperature of the pump unit becomes higher than the temperature of piping in the reactant gas recirculation path.