Impedance Noise Identification for State-of-Health Prognostics.

Christophersen, J. P. ; Motloch, C. G. ; Morrison, J. L. ; Donnellan, I. B. ; Morrison, W. H.

Technical Information Center Oak Ridge Tennessee

关键词: Noise signal;    Impedance monitoring;    Prognostics;    Battery impedance;    Measurement;   

RP-ID  :  DE2008936627

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

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 electrochemical impedance spectroscopy measurements. A brief description of the Impedance Noise Identification hardware system and representative test results are presented.