Brennstoffzellenbetriebsverfahren

The present invention relates to a fuel cell operation method in which a fuel cell 11 that generates power using hydrogen gas and oxidant gas as reaction gas is operated at an operating pressure that corresponds to a required power generation state. A hydrogen sensor 54 that detects hydrogen density is provided in a vicinity of the fuel cell 11 , and based on values detected by the hydrogen sensor 54 and on the amount of hydrogen leakage at the current operating pressure and on the characteristics of the fuel cell 11 , an operating pressure is predicted at which the hydrogen leakage amount from the fuel cell will not exceed a predetermined value, and the fuel cell 11 is operated while limiting the operating pressure to below the predicted operating pressure.