Patent ID: 7691516
Filing Date: 2010-04-06
Classification: H01M,Y02E

Abstract:
1. A fuel cell system comprising: at least one stack for generating electrical energy by an electrochemical reaction between hydrogen and oxygen; a fuel supply portion for supplying fuel to the stack; and an oxygen supply portion for supplying oxygen to the stack, wherein the stack comprises a plurality of membrane electrode assemblies separated by separators, the separators having first portions contacting an adjacent membrane electrode assembly and second portions spaced from an adjacent membrane electrode assembly to define passages through which the oxygen and hydrogen gas flow, each passage defining a height and a width, wherein the ratio of the width to the height of each passage is from 0.6 to 0.8, wherein the first portions are ribs projecting from each separator and the second portions are channels between neighboring ribs, wherein the width of each channel is from about 0.9 to about 1.1 mm, and a ratio of the width of each channel to a width of each rib is from about 1.1 to about 1.3, and wherein each separator comprises three channels.