Method for determining critical operating states in a fuel cell stack
US10145900B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 2, 2013 |
| Grant date | Dec 4, 2018 |
| Priority date | — |
| Expiry date | Feb 14, 2035 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02E60/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
The invention relates to a method for determining critical operating states in a fuel cell stack, consisting of single cells connected in series, wherein a low-frequency current or voltage signal is applied to the fuel cell stack, the resulting voltage or current signal is measured and the distortion factor thd is determined. According to the invention, the weighted sum of a term dependent on the membrane resistance Rm and a term dependent on the distortion factor thd is used to determine an indicator THDAdryout correlating with the drying out of the fuel cell membranes of the fuel cell stack, the membrane resistance Rm being detected by impedance measurement.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.