Patent ID: 8822092

Claim:
A fuel cell system, comprising: a fuel cell configured to be supplied with fuel gas and oxidizing gas to generate electricity, the fuel cell comprising an electrolyte membrane configured to contain water formed by reacting the fuel gas with the oxidizing gas; a fuel gas supply unit configured to supply the fuel gas to the fuel cell; an oxidizing gas supply unit configured to supply the oxidizing gas to the fuel cell; an aftercooler configured to reduce a temperature of the oxidizing gas to be supplied to the fuel cell by heat exchange with a coolant; a coolant temperature detector configured to detect a temperature of the coolant to be supplied to the fuel cell; and a coolant circulation controller configured to stop circulation of the coolant when the temperature of the coolant detected by the coolant temperature detector at start-up is not higher than a predetermined temperature, the predetermined temperature being a temperature not lower than a minimum temperature of the oxidizing gas, wherein the predetermined temperature is a temperature at which the water does not freeze and the fuel cell can generate electricity.