Patent ID: 8034498
Filing Date: 2011-10-11
Classification: G01R,H01M,Y02E

Abstract:
1. A fuel cell system comprising: a fuel cell; measurement means for measuring impedances of the fuel cell in two kinds or more of frequency regions including a low frequency region and a high frequency region; and first judgment means for judging two or more parameters including a supply state of a fuel gas with respect to the fuel cell and a wet state of an electrolytic film of the fuel cell and concerned with an internal state of the fuel cell based on measurement results of the impedances in the respective frequency regions, first detection means for detecting a water content state in the fuel cell; second detection means for detecting a fuel gas purity in the fuel cell; and second judgment means programmed to judge a factor for a defect based on detection results of the respective detection means in a case where the first judgment means judges that the supply state of the fuel gas is defective, wherein the measurement means measures the impedance in the low frequency region and the impedance in the high frequency region, wherein the first judgment means is programmed to judge the supply state of the fuel gas with respect to the fuel cell and the wet state of the electrolytic film of the fuel cell based on a combination of the measurement result of the impedance in the low frequency region and the measurement result of the impedance in the high frequency region, and wherein the second judgment means is programmed to judge based on a combination of the detection results of the respective detection means whether the factor for the defect is a supply abnormality of the fuel gas, a supply abnormality of an oxidizing gas or a fuel reaching abnormality due to flooding.