Flow field plate arrangement

C - Chemistry – Metallurgy – 25 – B

Patent

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Details

C25B 9/08 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2602204

The conventional arrangement of the reactant and coolant flow field structures causes a number of problems that require flow field plates to be made relatively thick. However, by making flow field plates thicker, size and weight are added to an electrochemical cell stack that is difficult to reduce. Yet, thin plates of conventional design are susceptible to cracking and/or rupturing. By contrast, according to some embodiments of the invention there is provided a cooperative arrangement of reactant flow field channels and ribs with coolant flow field channels and ribs that may reduce stress on individual flow field plates, thereby possibly permitting thinner flow field plates. More specifically, according to some embodiments of the invention the majority of ribs included in respective reactant and coolant flow field structures on the same flow field plate are aligned with one another.

Selon la présente invention, l'agencement traditionnel des structures formant champ d'écoulement des réactifs et du réfrigérant causent un certain nombre de problèmes qui nécessitent que les plaques formant champ d~écoulement soient fabriquées relativement épaisses. Cependant, en fabriquant des plaques de champ d~écoulement plus épaisses, on augmente, en pouvant difficilement les réduire, la taille et le poids d~un empilement de cellule électrochimique. Or, les plaques minces de conception traditionnelle sont susceptibles de se fissurer et/ou de se rompre. A l~inverse, certains modes de réalisations de la présente invention prévoient un agencement coopératif de canaux et cannelures formant champs d~écoulement pour les réactifs et de canaux et cannelures formant champ d~écoulement pour le réfrigérant, ledit agencement étant susceptible de réduire la contrainte exercée sur les plaques individuelles formant champ d~écoulement, moyennant quoi des plaques formant champ d~écoulement plus minces sont possibles. Plus spécifiquement, selon certains modes de réalisation de l~invention, la majorité des cannelures incluses dans les structures formant champ d'écoulement pour les réactifs et le réfrigérant, respectivement, sur une même plaque de champ d'écoulement sont alignées les unes par rapport aux autres.

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