Self-humidifying fuel cell

Details Self-humidifying fuel cell Self-humidifying fuel cell

H - Electricity

01

M

H01M 8/04 (2006.01) H01M 2/00 (2006.01) H01M 8/02 (2006.01) H01M 8/10 (2006.01)

Patent

CA 2344377

A self-humidifying polymer electrolyte membrane (PEM) fuel cell assembly has an ion-exchange membrane (12) interposed between hydrogen and oxygen diffusion layers (14, 16) to form a membrane electrode assembly (MEA) (10). The MEA (10) is in turn interposed between a pair of current collector plates (20, 22) having flow field channels (34, 36) for flowing the reactants adjacent the respective diffusion layers to produce corresponding anodic and cathodic electrochemical reactions. Various embodiments of the assembly incorporate one or more of the following features: interdigitated flow field channels (34, 36), countercurrent reactant flows, opposing channel alignment, and uncatalyzed membrane hydration enhancement zones (82, 84).

Cet ensemble pile à combustible, à membrane électrolytique polymère et à humidification autonome, présente une membrane échangeuse d'ions (12) placée entre des couches de diffusion d'hydrogène et d'oxygène (14, 16), afin de former un ensemble électrodes membranaires (10), lequel est à son tour placé entre une paire de plaques collectrices de courant (20, 22), présentant des canaux de champ d'écoulement (34, 36) servant à l'écoulement des réactifs à proximité des couches de diffusion respectives, afin de produire des réactions électrochimiques anodiques et cathodiques correspondantes. Divers modes de réalisation de l'ensemble incorporent au moins l'une des caractéristiques suivantes: canaux de champ d'écoulement interdigités (34, 36), écoulements de réactifs à contre-courant, alignement opposé de canaux, et zones d'accroissement (82, 84) de l'hydratation de la membrane non catalysée.

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