Internal PEM fuel cell water management

Details Internal PEM fuel cell water management Internal PEM fuel cell water management

2003-09-22

2008-10-14

Ryan, Patrick (Department: 1795)

Chemistry: electrical current producing apparatus, product, and

With pressure equalizing means for liquid immersion operation

C429S006000, C429S006000

Reexamination Certificate

active

07435502

ABSTRACT:
Water transfer means (86) transfers fuel cell product water from a cathode water transport plate (34) to an anode water transport plate (23) of the same or a different fuel cell, wholly within a fuel cell stack (50), (disposed within each fuel cell of a fuel cell stack (50)). The water transfer means may be a very high permeability proton exchange membrane (21a), a water transfer band (90) such as silicon carbide particles, a porous water transfer zone (107), with or without a flow restrictor (109), internal water manifolds (112, 113) which extend through an entire fuel cell stack, or internal manifolds (112a, 112b,112c,112d,113a,113b,113c,113d) which extend only through groups of cells between solid plates (71). As an example, 90% product water may be removed as vapor in oxidant exhaust, 30% may be transferred through the water transfer means (86) from cathode water transport plates to anode water transport plates, of which 20% may flow from the anode to the cathode, the net result of osmosis and proton drag, and 10% may exit the anode water transport plates as liquid water.

REFERENCES:
patent: 2002/0164513 (2002-11-01), Asano et al.
patent: 2003/0148164 (2003-08-01), Koch et al.
patent: 2003/0232234 (2003-12-01), Cisar et al.
U.S. Appl. No. 10/465,006, filed Jun. 19, 2003, Grasso et al.

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