The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 21, 2011
Filed:
Sep. 10, 2004
Herwig R Haas, Vancouver, CA;
Cara N Startek, Vancouver, CA;
Michael P Sexsmith, North Vancouver, CA;
Andrew J Desouza, Delta, CA;
Kelvin K Fong, Burnaby, CA;
Herwig R Haas, Vancouver, CA;
Cara N Startek, Vancouver, CA;
Michael P Sexsmith, North Vancouver, CA;
Andrew J DeSouza, Delta, CA;
Kelvin K Fong, Burnaby, CA;
BDF IP Holdings Ltd., Vancouver, BC, CA;
Abstract
Improved water distribution can be obtained within the cells of a fuel cell series stack by maintaining a suitable temperature difference between the cathode and anode sides of each cell in the stack during shutdown. A method of shutting down a fuel cell stack having at least two fuel cells stacked in series, each fuel cell having a cathode side and an anode side, the method comprising: stopped the generation of electricity from the stack; allowing the stack to cool over a cooldown period; and maintaining a temperature difference between the cathode side and the anode side of each fuel cell during the cooldown period, wherein the direction of the temperature difference in each fuel cell is the same. The fuel cell stack may comprise coolant channels, Peltier devices and anode and cathode reactant flow fields.