发明名称 |
Method for providing back-pressure for a fuel cell stack |
摘要 |
A method for controlling the pressure within a fuel cell stack to control the stack relative humidity. In one embodiment, a two-position valve receiving the cathode exhaust is switchable between a fully open and a fully closed position, where the valve is opened when the fuel cell system is operating at a low operation temperature and the valve is closed when the fuel cell system is operating at a high operation temperature. A fixed restriction valve is provided in parallel with the two-position valve so that when the two-position valve is fully closed, the proper amount of pressure is provided at the cathode output. In another embodiment, the two-position valve employs leak paths so that when the two-position valve is in the closed position, the cathode exhaust gas can still flow through.
|
申请公布号 |
US7749624(B2) |
申请公布日期 |
2010.07.06 |
申请号 |
US20070750888 |
申请日期 |
2007.05.18 |
申请人 |
GM GLOBAL TECHNOLOGY OPERATIONS, INC. |
发明人 |
CLINGERMAN BRUCE J.;SALVADOR JOHN P.;JAMES RONALD L. |
分类号 |
H01M8/00;B60L11/18;H01M2/00;H01M8/04;H01M8/10;H01M8/12 |
主分类号 |
H01M8/00 |
代理机构 |
|
代理人 |
|
主权项 |
|
地址 |
|