Vacuum assisted startup of a fuel cell at sub-freezing...

Chemistry: electrical current producing apparatus – product – and – Having magnetic field feature

Reexamination Certificate

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Details

C429S006000, C429S006000, C429S006000, C429S006000

Reexamination Certificate

active

07112379

ABSTRACT:
A vehicle (150) includes a fuel cell stack (151) started below freezing, by connection (158) to the vehicle propulsion system (159) within a few seconds of starting the flow of fuel (179) and oxidant (173), or when open circuit voltage (155, 156) is detected. The fuel in excess of stochiometry requirement and the oxidant in excess of at least twice stochiometric requirement, are at atmospheric pressure and at 4 kPa (0.6 psi) or more above the pressure of any water in said water passages due to a water passage vacuum pump205,and may be below freezing. Water transport plates (84, 86, 88, 89) have water passages connected to a water circulation loop (170) including a reservoir (164) having an auxiliary heater (161) connected (160) to the stack. Warming of cell stack materials and ice in the water transport plates, heat of fusion of melting ice, warming of melted water, and evaporative cooling of water melted in the water transport plates keep the stack cool until liquid coolant is circulated.

REFERENCES:
patent: 5798186 (1998-08-01), Fletcher et al.
patent: 6479177 (2002-11-01), Roberts et al.
patent: 6673481 (2004-01-01), Reiser et al.
patent: 2003/0039872 (2003-02-01), Grasso et al.

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