Passive restriction pathways in fuel cell water drainage

Details Passive restriction pathways in fuel cell water drainage Passive restriction pathways in fuel cell water drainage

2004-11-05

2010-02-16

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S010000, C429S006000

Reexamination Certificate

active

07662495

ABSTRACT:
A passive restriction passageway (for example, a passive capillary valve or a restricting orifice) positioned to drain accumulated liquid from a fuel cell reactant flow channel is used in conjunction with a control element for periodically adjusting the pressure across the passageway. The control element intermittently adjusts pressure across the passageway to enable liquid flow through the passageway. The restriction passageways and the adjustment of pressure periodically move liquid water through the passageways to drain liquid buildup from the reactant supply channels. Together, these features enable sustained performance from the fuel cell during operation and also prevent damage to the fuel cell when the fuel cell is exposed to freezing temperatures (especially after shutdown of the fuel cell).

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