Method of operating a fuel cell stack at low pressure and...

H - Electricity – 01 – M

Patent

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Details

H01M 8/02 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2629087

A method of operating a low pressure drop fuel cell stack comprising a plurality of low pressure drop fuel cells wherein during low pressure and low power operation, a heat transfer rate of a cathode flow field plate of each fuel cell is greater than a heat transfer rate of an anode flow field plate of the same fuel cell. Thus, a temperature gradient is created between an anode electrode and a cathode electrode of each fuel cell, as well as reactant fluids in at least one anode flow field and at least one cathode flow field of the same fuel cell.

L'invention concerne un procédé de fonctionnement d'un assemblage de piles à combustible comprenant une pluralité de piles à combustible à faible baisse de pression. Selon ledit procédé, au cours d'un fonctionnement à basse pression et de faible puissance, un rapport de transfert thermique d'une plaque de champ d'écoulement de cathode de chaque pile à combustible est supérieur au rapport de transfert d'une plaque de champ d'écoulement d'anode de la même pile à combustible. Ainsi, un gradient thermique est créé entre une électrode d'anode et une électrode de cathode de chaque pile à combustible ; des fluides réactifs sont également produits dans au moins un champ d'écoulement d'anode et au moins un champ d'écoulement de cathode de cette même pile à combustible.

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