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An electrochemical fuel cell assembly comprises a pair of separator layers and a membrane electrode assembly interposed between the separator layers. The membrane electrode assembly comprises a pair of electrodes and an ion exchange membrane interposed therebetween, the electrodes having electrocata

An electrochemical fuel cell assembly comprises a pair of separator layers and a membrane electrode assembly interposed between the separator layers. The membrane electrode assembly comprises a pair of electrodes and an ion exchange membrane interposed therebetween, the electrodes having electrocatalyst associated therewith defining an electrochemically active area. Each of the separator layers comprises one or more reactant stream passages in fluid communication with one of the electrodes. At least one of the separator layers further comprises one or more coolant stream passages which do not superpose the electrochemically active area of the adjacent membrane electrode assembly, and are fluidly isolated from the reactant stream passages.

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[ What is claimed is:] [1.] An electrochemical fuel cell assembly comprising:a pair of separator layers;a membrane electrode assembly interposed betweensaid separator layers, said membrane electrode assembly comprising a pair of electrodes and an ion exchange membrane interposed therebetween, said e

[ What is claimed is:] [1.] An electrochemical fuel cell assembly comprising:a pair of separator layers;a membrane electrode assembly interposed betweensaid separator layers, said membrane electrode assembly comprising a pair of electrodes and an ion exchange membrane interposed therebetween, said electrodes having electrocatalyst associated therewith defining an electrochemically active area;each of said separator layers comprising a reactant portion superposing said electrochemically active area and a remaining portion not superposing said electrochemically active area;each of said separator layers comprising a reactant stream inlet, a reactant stream outlet and at least one reactant stream passage in fluid communication with one of said electrodes for directing a fluid reactant stream from said reactant stream inlet to said reactant stream outlet, a predominant portion of said at least one reactant stream passage disposed in said reactant portion;at least one of said separator layers further comprising at least one coolant stream inlet, at least one coolant stream outlet and at least one coolant stream passage for directing a coolant stream from said at least one coolant stream inlet to said at least one coolant stream outlet, wherein said at least one coolant stream passage is disposed only in said remaining portion and is fluidly isolated from said at least one reactant stream passage.