Patent ID: 7678480
Filing Date: 2010-03-16
Classification: H01M,Y02E,Y02T

Abstract:
1. A fuel cell system comprising: a fuel cell that generates electricity by causing an electrochemical reaction between a fuel gas and an oxidant gas; a fuel gas supply system that supplies the fuel gas to a fuel electrode of the fuel cell; an oxidant gas supply system that supplies the oxidant gas to an oxidant electrode of the fuel cell; humidification means for humidifying the oxidant gas; communication means for switchably connecting and disconnecting between the fuel gas supply system and the oxidant gas supply system in an open/closed manner; and control means for, at system shutdown, stopping supply of the fuel gas to the fuel electrode of the fuel cell and at the same time, starting a supply to the oxidant electrode of a drier oxidant gas that is drier than the oxidant gas supplied thereto for normal electricity generation, and subsequently supplying the drier oxidant gas also to the fuel electrode through the communication means, and finally shutting down the fuel cell system.