Patent ID: 8956775
Filing Date: 2015-02-17
Classification: H01M,Y02E

Abstract:
1. A fuel cell system comprising: a fuel cell that includes at least one fuel-cell cell having an anode, a cathode and an electrolyte membrane; an anode-side passage adapted to supply and exhaust fuel gas to and from the anode of the at least one fuel-cell cell; a cathode-side passage adapted to supply and exhaust oxidation gas to and from the cathode of the at least one fuel-cell cell; a voltage detecting unit adapted to detect a voltage of the fuel cell; a suppressing unit adapted to set a suppression state where, after normal power generation of the fuel cell is terminated, introduction of the fuel gas to the anode-side passage and introduction of the oxidation gas to the cathode-side passage are suppressed as compared with those during the normal power generation, and emission of the fuel gas from the anode-side passage to an outside of the anode-side passage and emission of the oxidation gas from the cathode-side passage to an outside of the cathode-side passage are suppressed as compared with those during the normal power generation; an abnormality detecting unit comprising a controller that is programmed to detect, after the suppression state is set by the suppressing unit, abnormality of the fuel cell system on the basis of the voltage detected by the voltage detecting unit or a variation in the detected voltage, and a voltage variation detecting unit adapted to detect a voltage variation, which is real number value, per unit time at a predetermined time interval on the basis of the voltage detected by the voltage detecting unit, wherein the abnormality detecting unit comprising the controller is programmed to detect, that the fuel cell system is abnormal when a period of time that elapses from when the suppression state is set to when the voltage variation detected by the voltage variation detecting unit becomes a third voltage variation determination value, which is larger than or equal to zero, is shorter than a first time determination value.