Patent ID: 8790843

Claim:
A fuel cell stack, comprising: a first membrane electrode assembly (“MEA”); a second MEA; a stamped metal separator positioned between the first MEA and the second MEA, and a gasket disposed between peripheries of the stamped metal separator and the first MEA; wherein the stamped metal separator comprises a first surface facing the first MEA and a second surface facing the second MEA, wherein the first MEA and the first surface of the stamped metal separator contact each other and form a first channel therebetween, wherein the first channel has two ends, each of which is connected to a first manifold through which reactants or resultants from a fuel cell reaction may flow, wherein the gasket forms a first passage interposed between the one of the two ends of the first channel and the first manifold, wherein the first passage comprises a groove formed on the gasket, wherein the second MEA and the second surface of the stamped metal separator contact each other and form a second channel therebetween, wherein the second channel has two ends, each of which is connected to a second manifold through which reactants or resultants from the fuel cell reaction may flow, wherein a first imaginary straight line passing through the two ends of the first channel does not intersect a second imaginary straight line passing through the two ends of the second channel when viewed in a direction generally perpendicular to a surface of the MEA contacting the first surface, wherein the first MEA comprises an electrolyte membrane, a cathode formed on one surface of the electrolyte membrane except at a periphery of the electrolyte membrane, and an anode formed on another surface of the electrolyte membrane except at the periphery, wherein the first MEA and the first surface form another first channel therebetween, wherein the another first channel has two ends, each of which is connected to another first manifold through which reactants or resultants of a fuel cell reaction are configured to flow, and wherein a third imaginary straight line passing through the two ends of the another first channel does not intersect the second imaginary straight line when viewed in the direction generally perpendicular to the surface of the MEA contacting the first surface.