Electrochemical method for state of health estimation
AssigneeRobert Bosch GmbH
InventorsShirin MEHRAZI, Lei CHENG, Jonathan BRAATEN, Bjoern STUEHMEIER, Alexander VAN BRUNT, Nathan CRAIG, Jake CHRISTENSEN
Life of this patent
Estimating the term…
Abstract
An electrochemical method for state of degradation estimation. The method includes extracting capacitances from electrodes of a fuel cell stack at a bias potential at two or more aging characteristics during a fuel cell stack operation condition to obtain extracted capacitance signals. The method further includes determining a state of degradation of a component of the fuel cell stack in response to the extracted capacitances.
Claims20
An electrochemical method for state of degradation estimation comprising:
- extracting capacitances from electrodes of a fuel cell stack at a bias potential at two or more aging characteristics during a fuel cell stack operation condition to obtain extracted capacitance signals;
- and
- determining a state of degradation of a component of the fuel cell stack in response to the extracted capacitances.
An electrochemical system for state of degradation estimation, the system comprising:
- a fuel cell stack including electrodes;
- a power supply configured to hold a potential of the fuel cell stack constant;
- a direct current to direct current converter (DC/DC converter) configured to apply an alternating current to the fuel cell stack to extract electrode capacitances from the electrodes of the fuel cell stack;
- and
- a vehicle computer system configured to determine a state of degradation of the fuel cell stack in response to the extracted capacitances.
An electrochemical system for state of degradation estimation, the system comprising:
- a fuel cell stack including individual fuel cells including electrodes;
- a potentiostat connected to the fuel cell stack and configured to output current signals from the individual fuel cells;
- a cell voltage monitor connected to the fuel cell stack and configured to output voltage signals from the individual fuel cells;
- and
- a vehicle computer system configured to obtain impedance spectra from the individual cells in response to the current signals and the voltage signals and to determine a state of degradation of the fuel cell stack in response to the impedance spectra.
Dependencies are inferred from the claim text.