METHOD FOR IN SITU BATTERY DIAGNOSTIC BY ELECTROCHEMICAL IMPEDANCE SPECTROSCOPY
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United States of America Patent
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Issued Date -
Mar 21, 2013
app pub date -
Feb 11, 2010
filing date -
Feb 17, 2010
priority date (Note) -
Abandoned
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Abstract
The invention is a method for estimating the internal state of a system for the electrochemical storage of electrical energy, such as a battery. For various internal states of batteries of the same type as a battery being analysed, impedance measurements are carried out by adding an electrical signal to the current passing through the batteries. Then, an RC circuit is used to model the impedances. Next, a relationship is calibrated between the SoC (and/or the SoH) and the parameters of the RC circuit using multivariate statistical analysis. A measurement of the impedance of the battery under analysis is carried out which is modeled using the RC circuit. Finally, the relationship of the equivalent electric circuit defined for the battery being analysed is used to estimate the internal state of that battery.
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