Fuel cell operating method with improved hydrogen and oxygen...

Chemistry: electrical current producing apparatus – product – and – Fuel cell – subcombination thereof – or method of making or... – Grouping of fuel cells into stack or module

Reexamination Certificate

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Details

C429S458000, C429S471000, C429S512000, C429S443000

Reexamination Certificate

active

07820333

ABSTRACT:
A fuel cell system wherein a plurality of fuel cells are arranged in a series of stages, the number of fuel cells decreasing in number in each stage from anode gas inlet to the anode gas outlet. The system allows for parallel flow to all of the cells in a given stage and series flow between the various stages. A similar configuration is present on a cathode side of the system. However, the direction of flow is reversed, providing a greater number of cells in the stage nearest the cathode outlet and a fewer number of cells in the stage near the cathode gas inlet. The invention further provides for the various stages to be configured such that the direction of flow of the anode gas of a given stage is generally opposite the direction of flow of the cathode gas of a given stage.

REFERENCES:
patent: 5478662 (1995-12-01), Strasser
patent: 6251534 (2001-06-01), McElroy
patent: 6821668 (2004-11-01), Perry et al.
patent: 7479333 (2009-01-01), Bai et al.
patent: 2005/0019648 (2005-01-01), Rapaport et al.
patent: 2005/0164069 (2005-07-01), Margiott et al.
patent: 1213780 (2002-06-01), None
patent: 1213780 (2002-06-01), None
patent: 1294037 (2003-03-01), None

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