Chemistry: electrical current producing apparatus – product – and – With pressure equalizing means for liquid immersion operation
Reexamination Certificate
2004-12-10
2008-09-23
Alejandro, Raymond (Department: 1795)
Chemistry: electrical current producing apparatus, product, and
With pressure equalizing means for liquid immersion operation
C429S006000, C429S009000, C320S101000
Reexamination Certificate
active
07427450
ABSTRACT:
A fuel cell system that employs a super capacitor and battery electrically coupled in series with each other and in parallel with a fuel cell stack on a power bus line. As the voltage on the power bus line changes over the operating requirements of the system, the super capacitor is charged and discharged over a relatively large voltage swing, such as an 85% SOC swing. The super capacitor equalizes or voltage matches the voltage variation on the power bus line as set by the stack voltage to the voltage of the battery. Therefore, the battery, while providing the majority of the energy and power during charge and discharge, has a relatively small defined SOC swing, which acts to maintain the battery life. The system can also include a diode electrically coupled in parallel with the super capacitor that provides reverse voltage protection and electrical power by-pass.
REFERENCES:
patent: 6262896 (2001-07-01), Stancu et al.
patent: 2003/0072977 (2003-04-01), Speranza et al.
patent: 2004/0126635 (2004-07-01), Pearson
Alejandro Raymond
General Motors Corporation
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