FUEL CELL SYSTEM

A fuel cell system includes a component in a circulation passage for off-gas, a battery temperature acquisition unit configured to acquire a fuel cell temperature, a component temperature acquisition unit configured to acquire a component temperature, a state-of-charge acquisition unit configured to acquire a state of charge of a secondary battery, and a controller configured to, when a temperature difference between the acquired fuel cell temperature and the acquired component temperature is greater than or equal to a predetermined temperature difference at the time of a stop of power generation of the fuel cell system, perform a warm-up operation of a fuel cell and store electric power generated through the warm-up operation in the secondary battery while the state of charge of the secondary battery is lower than a predetermined state of charge, and, after completion of the warm-up operation, perform the scavenging operation at predetermined scavenging power.