Matching of the local area-specific gas flows in PEM fuel cells

Details Matching of the local area-specific gas flows in PEM fuel cells Matching of the local area-specific gas flows in PEM fuel cells

2004-05-25

2008-12-16

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000

Reexamination Certificate

active

07465513

ABSTRACT:
A passage structure for PEM fuel cells is configured locally differently in order to adapt the flow of gas on the membrane electrode assembly (MEA). Starting from the cathode entry port, the active gas volumetric flow per unit area on the MEA is locally varied by changing the number and/or cross section of the gas-carrying passages, so that the flow decreases toward the cathode exit port. Suitable configuration of the passage structure according to the invention allows the steam partial pressure to be optimally matched to the local conditions. The mass conversion is improved in these regions as a result without the electrolyte's drying out. At locations in the flowfield with a low gas humidity, the measures according to the invention (increased number of passages or passage width) significantly reduce the flow velocity. As a result, the transfer of water from the MEA to the gas flow is reduced and drying of the MEA is diminished.

REFERENCES:
patent: 6756149 (2004-06-01), Knights et al.
patent: 6844101 (2005-01-01), Lee et al.
patent: 6921598 (2005-07-01), Yamamoto et al.
patent: 197 43 067 (1997-09-01), None
patent: 692 19 758 (1997-11-01), None
patent: 100 01 606 (2000-01-01), None
patent: 100 45 098 (2000-09-01), None
patent: 100 54 444 (2000-10-01), None
patent: 100 55 253 (2000-11-01), None

Affiliated with

Also associated with

Rating

Matching of the local area-specific gas flows in PEM fuel cells does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Matching of the local area-specific gas flows in PEM fuel cells, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Matching of the local area-specific gas flows in PEM fuel cells will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4035490