Dry compliant seal for phosphoric acid fuel cell

Details Dry compliant seal for phosphoric acid fuel cell Dry compliant seal for phosphoric acid fuel cell

1989-09-11

1990-12-18

Skapars, Anthony

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

429 36, H01M 208

Patent

active

049785907

ABSTRACT:
A dry compliant overlapping seal for a phosphoric acid fuel cell preformed f non-compliant Teflon to make an anode seal frame that encircles an anode assembly, a cathode seal frame that encircles a cathode assembly and a compliant seal frame made of expanded Teflon, generally encircling a matrix assembly. Each frame has a thickness selected to accommodate various tolerances of the fuel cell elements and are either bonded to one of the other frames or to a bipolar or end plate. One of the non-compliant frames is wider than the other frames forming an overlap of the matrix over the wider seal frame, which cooperates with electrolyte permeating the matrix to form a wet seal within the fuel cell that prevents process gases from intermixing at the periphery of the fuel cell and a dry seal surrounding the cell to keep electrolyte from the periphery thereof. The frames may be made in one piece, in L-shaped portions or in strips and have an outer perimeter which registers with the outer perimeter of bipolar or end plates to form surfaces upon which flanges of pan shaped, gas manifolds can be sealed.

REFERENCES:
patent: 4007059 (1977-02-01), Witherspoon et al.
patent: 4187390 (1980-02-01), Gore
patent: 4374185 (1983-02-01), Power et al.
patent: 4728533 (1988-03-01), Feigenbaum et al.
patent: 4728585 (1988-03-01), Briggs
patent: 4732637 (1988-03-01), Dettling et al.
patent: 4738905 (1988-04-01), Collins
patent: 4756981 (1988-07-01), Breault et al.

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