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Abstract and Applied Analysis
Volume 2013 (2013), Article ID 481976, 6 pages
http://dx.doi.org/10.1155/2013/481976
Research Article

An Adaptive Estimation Scheme for Open-Circuit Voltage of Power Lithium-Ion Battery

School of Control Science and Engineering, Shandong University, Jinan 250061, China

Received 29 October 2013; Accepted 8 December 2013

Academic Editor: Qi-Ru Wang

Copyright © 2013 Yun Zhang et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Open-circuit voltage (OCV) is one of the most important parameters in determining state of charge (SoC) of power battery. The direct measurement of it is costly and time consuming. This paper describes an adaptive scheme that can be used to derive OCV of the power battery. The scheme only uses the measurable input (terminal current) and the measurable output (terminal voltage) signals of the battery system and is simple enough to enable online implement. Firstly an equivalent circuit model is employed to describe the polarization characteristic and the dynamic behavior of the lithium-ion battery; the state-space representation of the electrical performance for the battery is obtained based on the equivalent circuit model. Then the implementation procedure of the adaptive scheme is given; also the asymptotic convergence of the observer error and the boundedness of all the parameter estimates are proven. Finally, experiments are carried out, and the effectiveness of the adaptive estimation scheme is validated by the experimental results.