Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Reexamination Certificate
2005-05-03
2005-05-03
Ryan, Patrick (Department: 1745)
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
C429S006000
Reexamination Certificate
active
06887610
ABSTRACT:
A bipolar plate assembly for a proton exchange membrane fuel cell stack advantageously connects electrically conductive plate surfaces, without the requirement to weld or braze the plate pairs. Each plate has alternating coolant channels and lands formed on an inside facing surface. An electrically conductive layer is deposited over at least the coolant channels and lands. Pairs of plates are aligned having facing electrically conductive layers. A fluid seal is disposed between the inside facing surfaces about a perimeter of the coolant channels. Each plate pair is compressed to form a plurality of electrical bond lines between adjacent lands within the perimeter seal. The perimeter seal prevents stack reactant gas oxygen from contacting and oxidizing the electrically conductive layer. A dielectric coolant is also used to reduce oxidation of the electrically conductive layer.
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Abd Elhamid Mahmoud H.
Blunk Richard H.
Lisi Daniel J.
Mikhail Youssef M.
Brooks, Esq. Cary W.
Deschere, Esq. Linda M.
General Motors Corporation
Parsons Thomas H.
Ryan Patrick
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