Water and heat management in solid polymer fuel cell stack
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United States of America Patent
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-
May 2, 1989
Issued Date -
N/A
app pub date -
May 26, 1988
filing date -
Jan 21, 1988
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Product water and proton transfer water are removed from the cathode side of a solid polymer fuel cell assembly and an absorbant oxygen flow field plate which contacts a wetproofed carbon paper sheet abutting the cathode side of the electrolyte polymer. Water droplets appearing on the outer surface of the paper sheet are absorbed into the flow field plate and then move laterally through the flow field plate to the edges thereof under the influence of the high pressure oxygen reactant gas in the oxygen flow field. A gas-sealing bubble barrier plate borders the oxygen flow field plate to allow passage of water, but prevent passage of oxygen, out of the oxygen flow field plate. Slots are formed in the bubble barrier plates to collect water from the oxygen flow field plates. In a stack of the cell assemblies, water passages communicate with the slots, and all of the plates carry water through the passages to the end of the stack where the water is ejected.
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