Electrochemical fuel cell with non-uniform fluid flow design

Details Electrochemical fuel cell with non-uniform fluid flow design Electrochemical fuel cell with non-uniform fluid flow design

H - Electricity

01

M

H01M 8/00 (2006.01) H01M 4/86 (2006.01) H01M 8/02 (2006.01) H01M 8/04 (2006.01)

Patent

CA 2409126

An electrochemical fuel cell having reactant flow passages with a non-uniform design to increase reactant access to an adjacent fluid distribution layer at the outlet region as compared to the inlet region. In an embodiment, at least one reactant flow passage is narrower at the inlet than at the outlet, with a substantially constant cross- sectional area maintained along its length. Coolant channels may optionally be incorporated in the fluid flow plate to provide increased cooling at the reactant inlet. The plates may vary in thickness and run in counter-flow to improve efficient stacking of the fuel cells in a fuel cell stack with reactant passages of varying depth. In another embodiment, electrically conductive, masking foil covers a portion of at least one reactant flow passage in the inlet region, but does not extend the length of the passage. 17

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