METHOD FOR IMPROVING THE WATER BALANCE OF FUEL CELLS

摘要

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.