Patent ID: 8206856

Claim:
A fuel cell system comprising: a controller; a cooling water pump which is provided on cooling water piping which transports cooling water to a fuel cell and which pumps the cooling water; fuel gas supply piping which is connected to the fuel cell and which supplies a fuel gas to the fuel cell; fuel gas circulation piping which is connected to the fuel cell and to the fuel gas supply piping and which circulates a fuel gas discharged from the fuel cell to the fuel gas supply piping; and a fuel gas pump which is provided on the fuel gas circulation piping and which pumps the fuel gas discharged from the fuel cell to the fuel gas supply piping, wherein the fuel gas discharged from the fuel cell is pumped by the fuel gas pump after an operation of the fuel cell is stopped, and the controller is programmed to control the cooling water pump so that the cooling water is pumped by the cooling water pump to cool the fuel cell and lower a temperature of the fuel cell to a lower temperature than a temperature of the fuel gas pump after the operation of the fuel cell is stopped.