Patent ID: 8951687
Filing Date: 2015-02-10
Classification: H01M,Y02E

Abstract:
1. A fuel cell system for implementing, at a system stop, a stop control which extracts a current from a fuel cell and consumes a cathode side oxygen when a supply of a fuel gas to an anode side of the fuel cell is continued and a supply of an oxidant gas to a cathode side of the fuel cell is stopped, the fuel cell system comprising: a controller programmed for ending the stop control when a remaining quantity of cathode side oxygen is reduced to a certain quantity; and a hydrogen processor configured to process hydrogen by lowering a hydrogen concentration on the cathode side to less than or equal to a combustible concentration when the fuel cell system starts, wherein the certain quantity is set to a value such that a maximum hydrogen concentration on the cathode side in a left-uncontrolled period after the system stop is an internal maximum hydrogen concentration that is less than or equal to a hydrogen processing capability limit of the hydrogen processor at system start.