Improved fuel cell cathode flow field

H - Electricity – 01 – M

Patent

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H01M 8/04 (2006.01) H01M 4/86 (2006.01)

Patent

CA 2594365

A fuel cell cathode flow field has multiple channels each with a cross- sectional area that varies along the length of the channel such that oxygen availability at every lengthwise position along the channel is kept substantially constant for a given channel length and air stoichiometry ratio. Each channel comprises a flat floor with substantially constant depth and a pair of side walls extending upwardly from the floor; the side walls each taper inwards from channel inlet to outlet with a convex curve relative to the channel centreline. Achieving substantially uniform oxygen availability throughout the flow field results in substantially uniform current density throughout the flow field, which is desirable for efficient fuel cell operation and improved performance.

L~invention concerne un champ de flux de cathode pour pile à combustible ayant de multiples canaux, chacun avec une section transversale variant sur la longueur du canal de sorte que la disponibilité en oxygène en tout point de la longueur du canal est maintenue sensiblement constante sur un tronçon de canal donné et pour un rapport stoechiométrique d~air donné. Chaque canal comporte un sol plat avec une profondeur sensiblement constante et une paire de parois latérales s~étendant vers le haut à partir du sol ; les parois latérales s~amincissant chacune vers l~intérieur depuis l~entrée du canal vers la sortie en suivant une courbe convexe par rapport à la ligne médiane du canal. L~obtention d~une disponibilité d~oxygène sensiblement uniforme sur tout le champ de flux se traduit par une densité de courant sensiblement uniforme sur tout le champ de flux, ce qui est désirable pour une exploitation efficace et des performances améliorées de la pile à combustible.

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