METHOD FOR IMPROVING THE WATER BALANCE OF FUEL CELLS

WIPO Patent Application WO2002059992

A3

The invention relates to a method for improving the water balance of an electrochemical cell stack, comprising: - a membrane electrode assembly (MEA) consisting of an anode, a cathode and an electrolyte arranged therebetween; - an anode gas chamber for distributing the anode gas to the membrane electrode assembly, said anode gas containing hydrogen and being de-humidified or partially humidified; - a cathode gas chamber for distributing the cathode gas to the membrane electrode assembly, said cathode gas containing oxygen; - a cooling chamber for distributing a coolant for cooling the cell stack, said cooling chamber being separated from the cathode gas chamber (3) by a porous separation plate (6). According to the invention, water is exchanged between the cathode gas and the coolant through the porous separation plate (6), located between the cathode gas chamber (3) and the cooling chamber (4), by means of an aqueous coolant, which has a lower temperature-dependent water-vapour partial pressure in relation to water.

ERDLE ERICH (DE)
KOCH ALFRED (DE)
KONRAD GERHARD (DE)
SCHMID OTTMAR (DE)

PCT/EP2002/000360

July 31, 2003

January 16, 2002

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DAIMLER CHRYSLER AG (DE)
ERDLE ERICH (DE)
KOCH ALFRED (DE)
KONRAD GERHARD (DE)
SCHMID OTTMAR (DE)

H01M8/04029; H01M8/04119; (IPC1-7): H01M8/04

WO1997002615A1	1997-01-23
WO2000079627A1	2000-12-28

US5358799A

1994-10-25

PATENT ABSTRACTS OF JAPAN vol. 015, no. 143 (E - 1054) 11 April 1991 (1991-04-11)
PATENT ABSTRACTS OF JAPAN vol. 1996, no. 11 29 November 1996 (1996-11-29)

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