Flow field plate for use in fuel cells

Details Flow field plate for use in fuel cells Flow field plate for use in fuel cells

H - Electricity

01

M

H01M 8/04 (2006.01)

Patent

CA 2567729

A method of flowing reactants over an ion exchange membrane in a fuel cell flow field plate is provided. The flow field plate is provided, comprising a network of flow channels in the plate bounded by an electrochemically active electrode, the network comprising a series of passages having parallel grooves, the passages being interconnected by a header providing a substantially even redistribution of fluid flow received from grooves of one passage to grooves of the next passage. A reactant fluid is supplied to create a flow across the network to achieve a desired reactant utilization, wherein a flow rate and a concentration of reactant molecules per active area of membrane in the grooves increase by less than 80% across the header.

Il est prEvu un procEdE d'Ecoulement de rEactifs sur une membrane d'Echange d'ions dans une plaque de champ d'Ecoulement de cellules Electrochimiques. Il est Egalement prEvu une plaque de champ d'Ecoulement, comprenant un rEseau de canaux d'Ecoulement dans la plaque délimité par une Electrode active Electrochimiquement, le rEseau comprenant une sErie de passages ayant des gorges parallEles, les passages Etant reliés entre eux par un collecteur assurant une rEpartition sensiblement uniforme de l'Ecoulement de fluide reÇu des gorges d'un passage vers les gorges du passage suivant. Un fluide rEactif est injectE pour crEer un Ecoulement à travers le rEseau pour arriver à l'utilisation souhaitée des rEactifs, le dEbit et la concentration de molEcules rEactives par zone active de membrane dans les gorges augmentant de moins de 80 % à travers le collecteur.

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