GAS-INLET PRESSURE ADJUSTMENT STRUCTURE FOR FLOW FIELD PLATEOF FUEL CELL STACK

摘要

Disclosed is a gas-inlet pressure adjustment structure for a flow field plat e of a fuel cell stack. At least one gas inlet opening, at least one gas outlet opening, and a plurality of channels are defined in a central zone of the flow field plate. A membrane electrode assembly is stacked over the central zone. The channels a re of a parallel arrangement and each having a reduced open end and an expanded open end, the reduced open end having a cross-sectional area smaller than th at of the expanded open end. The reduced open end communicates the gas inlet opening through which a reaction gas is supplied to the flow field plate. Water generated by chemical reaction occurring inside the flow field plate and attached to a surface of the gas channel by surface tension is expelled out of the channel by a force caused by a pressure difference induced in the reaction gas, which i s supplied through the gas inlet opening and flows in sequence through the reduced open end, the channel, and the expanded open end and eventually discharges through the gas outlet opening.