Patent ID: 7264900
Filing Date: 2007-09-04
Classification: H01M,Y02E

Abstract:
1. A fuel cell system comprising: a fuel cell for generating electricity using a hydrogen gas and an oxidant gas as a reaction gas; a hydrogen discharge unit for discharging hydrogen from the fuel cell under a predetermined condition; a hydrogen concentration reduction process unit for reducing the concentration of hydrogen discharged from the hydrogen discharge unit; a hydrogen concentration detection unit for detecting an instantaneous hydrogen concentration of a gas processed by the hydrogen concentration reduction process unit; and an average hydrogen concentration calculating unit for calculating an average hydrogen concentration per hour of a gas processed by the hydrogen concentration reduction process unit, wherein the discharge of hydrogen from the fuel cell by the hydrogen discharge unit is prohibited in the event that the instantaneous hydrogen concentration exceeds a first threshold or the average hydrogen concentration calculated by the average hydrogen concentration calculating unit exceeds a second threshold which is lower than the first threshold, and the discharge of hydrogen from the fuel cell by the hydrogen discharge unit is permitted in the event that the instantaneous hydrogen concentration does not exceed the first threshold and the average hydrogen concentration does not exceed the second threshold.