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Method and apparatus for cooling electrochemical fuel cell system components. Periodic reversal of the direction of flow of cooling fluid through a fuel cell stack provides greater uniformity and cell operational temperatures. Flow direction through a recirculating coolant fluid circuit is reversed

Method and apparatus for cooling electrochemical fuel cell system components. Periodic reversal of the direction of flow of cooling fluid through a fuel cell stack provides greater uniformity and cell operational temperatures. Flow direction through a recirculating coolant fluid circuit is reversed through a two position valve, without requiring modulation of the pumping component.

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An electrochemical generation system comprising a stack of a plurality of fuel cells; a cooling module; means for selectively periodically reversing the direction of flow of a coolant fluid through said cooling module; process channels within said stack for flow therethrough of an oxidant and a fuel

An electrochemical generation system comprising a stack of a plurality of fuel cells; a cooling module; means for selectively periodically reversing the direction of flow of a coolant fluid through said cooling module; process channels within said stack for flow therethrough of an oxidant and a fuel, and coolant channels within said cooling module segregated from said process channels, for flow of said coolant therethrough; and wherein the surface area of said coolant channels varies through said cooling module from a large value at the center of said cooling module to a smaller value towards the edges of said cooling module.