One critical problem in using batteries as a source of power for automobiles or for emergency backup systems is to know whether or not the battery will do its job. Is the state of health of the battery sufficient for the task demanded of it? Ohmic techniques, which measure changes in the impedance of a battery, have been implemented to monitor the battery's state of health. During the past couple years, Cadex Electronics has implemented a method using multi-model electrochemical impedance spectroscopy. The technology is currently being tested at various car and battery manufacturers around the world. This paper will describe this technology and provide some field and laboratory data. For automotive batteries, the method described provides the result to the user in a short amount of time and in a format that is simple to interpret. Currently, the authors are implementing new electrochemical models in order to improve the results further. All told results indicate that this method, which uses a spectrum of excitation frequencies in combination with several electrochemical models to fit the out-coming data, is an effective tool to estimate the CCA (cold cranking amps) and for the first time capacity of batteries.
Field trial results using multi-model electrochemical impedance spectroscopy for estimating battery state of health
2005
9 Seiten, 7 Bilder, 14 Quellen
(nicht paginiert)
Conference paper
English
Electrochemical impedance spectroscopy in battery management systems
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