Patent ID: 8383278
Filing Date: 2013-02-26
Classification: H01M,Y02E

Abstract:
1. An operating method for a fuel cell system, the fuel cell system comprising: a fuel cell which generates electric power for a load using hydrogen-containing fuel gas and oxygen-containing oxidizing gas; a fuel gas supplier which supplies the fuel gas to the fuel cell; and an oxidizing gas supplier which supplies the oxidizing gas to the fuel cell, the fuel cell system operating method comprising steps of: generating the electric power by the fuel cell during an electric power generation period under a condition that one of a dew point of the fuel gas and a dew point of the oxidizing gas is higher than or equal to a temperature of the fuel cell and the other one of the dew point of the fuel gas and the dew point of the oxidizing gas is lower than the temperature of the fuel cell; when stopping the fuel cell system, causing the temperature of the fuel cell and the other one of the dew point of the fuel gas to be supplied to the fuel cell and the dew point of the oxidizing gas to be supplied to the fuel cell to be at least equal; and after the temperature of the fuel cell and the other one of the dew point of the fuel gas to be supplied to the fuel cell and the dew point of the oxidizing gas to be supplied to the fuel cell become at least equal, interrupting the electrical connection between the fuel cell and the load.