Impedance Noise Identification for State-of-Health Prognostics
Impedance Noise Identification is an in-situ method of measuring battery impedance as a function of frequency using a random small signal noise excitation source. Through a series of auto- and cross-correlations and Fast Fourier Transforms, the battery complex impedance as a function of frequency can be determined. The results are similar to those measured under a lab-scale electrochemical impedance spectroscopy measurement. The lab-scale measurements have been shown to correlate well with resistance and power data that are typically used to ascertain the remaining life of a battery. To this end, the Impedance Noise Identification system is designed to acquire the same type of data as an on-board tool. A prototype system is now under development, and results are being compared to standardized measurement techniques such as electrochemical impedance spectroscopy. A brief description of the Impedance Noise Identification hardware system and representative test results are presented.
- Research Organization:
- Idaho National Laboratory (INL)
- Sponsoring Organization:
- DOE - EE
- DOE Contract Number:
- AC07-99ID13727
- OSTI ID:
- 936627
- Report Number(s):
- INL/CON-08-14101
- Country of Publication:
- United States
- Language:
- English
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