Fuel cell system and method of operating fuel cell system

摘要

The invention is provided to reliably restore generated voltage that has declined due to clogging of water in a fuel cell stack. A method of operating a fuel cell system having a fuel cell stack that generates electricity through an electrochemical reaction between a fuel gas including hydrogen gas and an oxidation gas, wherein when a generated voltage of the fuel cell stack declines, the water-in-cell content of the fuel cell stack is adjusted so that a variation in cell pressure loss in the fuel cell stack decreases based on a characteristic curve of the water-in-cell content of the fuel cell stack and the cell pressure loss of the fuel cell stack.

主权项

1. A fuel cell system having a fuel cell stack that generates electricity through an electrochemical reaction between a fuel gas including hydrogen gas and an oxidation gas,
the fuel cell system comprising: a water-in-cell content adjusting device programmed to adjust, when a generated voltage of the fuel cell stack declines, a water-in-cell content of the fuel cell stack based on a characteristic curve of the water-in-cell content of the fuel cell stack and the cell pressure loss of the fuel cell stack, wherein the water-in-cell content adjusting device programmed to adjust the water-in-cell content of the fuel cell stack so that an average water-in-cell content of the fuel cell stack falls within a stable section in which the cell pressure loss varies moderately relative to a steep section with respect to the water-in-cell content on the characteristic curve.