Journal
JOURNAL OF POWER SOURCES
Volume 158, Issue 2, Pages 874-878Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jpowsour.2005.11.008
Keywords
battery condition monitoring; lead-acid batteries; VRLA; state of charge (SOC); direct current resistance (DCR); state of health (SOH)
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A novel battery condition monitoring (BCM) technology for lead-acid batteries has been developed. We have developed a highly reliable SOC monitor that improves the estimated precision of the stored capacity to +/- 5% for both the flooded type and VRLA. A novel SOC estimation algorithm was also developed. The SOC value was obtained by the weighting combination of the values from the SOC-DCR table and the current integration. Kalman Filtering Theory contributed to developing this system. In order to improve the accuracy of the SOC-DCR table, we have derived a theoretical equation for the SOC-DCR relationship. This equation helps to interpolate the data and improve the accuracy of the SOC-DCR table. (c) 2005 Elsevier B.V. All rights reserved.
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