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:
Apr. 30, 2013
Filed:
Apr. 13, 2007
Manfred Herrmann, Ginsheim, DE;
Manfred Herrmann, Ginsheim, DE;
GM Global Technology Operations LLC, Detroit, MI (US);
Abstract
A fuel cell system that employs a closed coolant loop. The system includes an expansion device having a flexible membrane, where a cooling fluid side of the membrane is in fluid communication with the cooling fluid in the coolant loop and an air side of the membrane is in communication with an air pocket. The air side of the expansion device is in air communication with an air compressor so that the pressure of the cooling fluid within the coolant loop changes as the stack pressure changes. The fuel cell system also includes a coolant reservoir that is in fluid communication with the cooling fluid in the coolant loop. Air and hydrogen bubbles within the cooling fluid are vented to the coolant reservoir where they accumulate. The coolant reservoir includes a level sensor indicating the level of the cooling fluid therein.