FUEL CELL SYSTEM AND FUEL CELL SYSTEM WARM-UP METHOD

A fuel cell system comprises a fuel cell supplied with fuel and air to generate electricity, an evaporator evaporating the fuel, an off-gas heating device heating an off-gas discharged from the fuel cell to produce a heating gas, a fuel cell heating device heating the fuel cell using the heating gas, an evaporator heating device heating the evaporator using the heating gas, a fuel cell temperature acquisition unit, an evaporator temperature acquisition unit, and a controller configured to, in a warm-up operation to perform a warm-up of the evaporator and a warm-up of the fuel cell, control at least one of the evaporator heating device and the fuel cell heating device based on the temperature of the evaporator and the temperature of the fuel cell to adjust at least one of a heating amount of the evaporator and a heating amount of the air by the heating gas.