Bipolar plate having offsets

Details Bipolar plate having offsets Bipolar plate having offsets

2007-09-18

2007-09-18

Kalafut, Stephen J. (Department: 1745)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000

Reexamination Certificate

active

11218930

ABSTRACT:
A bipolar plate for a PEM fuel cell is disclosed. The plate includes a plurality of channels, wherein the ends of the channels are staggered. The plate also includes a plurality of tunnels, wherein the ends of the tunnels are staggered. The plate further includes a cathode and an anode, wherein a portion of the cathode overhangs a portion of the anode. These staggered/offset features allow for an increase the capillary meniscus of water droplets passing therethrough, allowing for a reduction in the pressure required to move the water through the cell and out to the header volume of the stack.

REFERENCES:
patent: 4758481 (1988-07-01), Fauvel
patent: 5750281 (1998-05-01), Washington et al.
patent: 6348280 (2002-02-01), Maeda et al.
patent: 6406809 (2002-06-01), Fujii et al.
patent: 6410179 (2002-06-01), Boyer et al.
patent: 6699614 (2004-03-01), Rock
patent: 6773841 (2004-08-01), Rapaport et al.
patent: 2004/0209150 (2004-10-01), Rock et al.

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