Fuel cell system with detection module for detecting...

H - Electricity – 01 – M

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H01M 8/04 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2598835

In a fuel cell system including a stack of polymer electrolyte fuel cells, the wet state of electrolyte membranes in the fuel cell stack is detected according to a variation in measurement value of an alternating current impedance (AC impedance) of the fuel cell stack. In an adequate level of water content of the electrolyte membranes, the measurement value of the AC impedance is substantially constant and has a very little variation. In an excess level of water content of the electrolyte membranes, the measurement value of the AC impedance has a significant variation. The AC impedance of the fuel cell stack is determinable by frequency analysis of high-frequency noise generated by an inverter included in the fuel cell system.

Dans un système de piles à combustible comprenant une pile à combustible de type polymère à l~état solide, l~état humide du film électrolytique de l~empilement de piles à combustible est évalué en fonction des irrégularités de l~impédance a.c de l~empilement de piles à combustible. Lorsque, par exemple, la teneur en humidité du film électrolytique est appropriée, la valeur de l~impédance a.c est quasi constante et présente des irrégularités mineures. De plus, lorsque la teneur en humidité du film électrolytique est trop élevée, la valeur de l~impédance a.c change considérablement. Il est à noter que l~impédance a.c de l~empilement de piles à combustible est mesurée en analysant la fréquence du bruit haute-fréquence généré par l~onduleur disposé dans le système de piles à combustible.

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