Fuel cell system

A fuel cell system installed in a vehicle, the system comprising:

• a fuel cell,
• a secondary cell,
• a temperature acquirer for acquiring a temperature of the fuel cell,
• a state-of-charge value acquirer for acquiring a state-of-charge-value of the secondary cell,
• an outside temperature acquirer for acquiring an outside temperature,
• an outside pressure acquirer for acquiring an outside pressure,
• a controller for controlling power of the secondary cell, and
• a memory storing a data group showing the relationship between the outside temperature, the outside pressure and a cooling water temperature of the fuel cell, which are measured in advance
• wherein, when the temperature of the fuel cell exceeds a predetermined temperature, when the state-of-charge value of the secondary cell is a predetermined threshold value or more, when the outside temperature is a predetermined temperature or more, and when the outside pressure is a predetermined pressure or less, the controller increases the power of the secondary cell larger than power required of the secondary cell for normal running of the vehicle;
• wherein the controller determines the power of the secondary cell so that the temperature of the fuel cell reaches the predetermined temperature;
• wherein the predetermined temperature of the fuel cell is a temperature at which power generation efficiency of the fuel cell is maximum;
• and
• wherein the predetermined temperature of the outside temperature and the predetermined pressure of the outside pressure are determined from the data group.