Control system and method for starting a frozen fuel cell

Details Control system and method for starting a frozen fuel cell Control system and method for starting a frozen fuel cell

2005-05-03

2005-05-03

Stinson, Frankie L. (Department: 1746)

Chemistry: electrical current producing apparatus, product, and

Having magnetic field feature

C429S010000, C429S010000

Reexamination Certificate

active

06887598

ABSTRACT:
A method for starting a frozen fuel cell stack includes discontinuing reactant humidification before shutting down the fuel cell stack. The anode and cathode are purged with the dry reactants. The fuel cell stack is soaked at freezing temperatures. During subsequent startup, dry reactants are initially delivered. An outlet temperature of the anode and a current load of the fuel cell stack are measured. The dry reactants are shut off when the temperature of the anode outlet or the current load reach predetermined values. The open circuit voltage potential of the fuel cells is monitored and compared to a first voltage value. When the open circuit voltage exceeds the first value, the fuel cell stack begins supplying current load. The current load of the fuel cell stack is increased or decreased based on a difference between the minimum voltage and a second voltage value.

REFERENCES:
patent: 6358637 (2002-03-01), Fuss
patent: 6413661 (2002-07-01), Clingerman et al.
patent: 6413662 (2002-07-01), Clingerman et al.
patent: 6416893 (2002-07-01), Clingerman et al.
patent: 6727013 (2004-04-01), Wheat et al.
patent: 20020009623 (2002-01-01), St-Pierre et al.
Search Report PCT/US03/24734 dated May 21, 2004.

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