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A Technique for Estimating the State of Health of Lithium Batteries Through a Dual-Sliding-Mode Observer

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1 Author(s)
Il-Song Kim ; Dept. of Electr. Eng., Chung-Ju Nat. Univ., Chung-Ju, South Korea

A new state-of-health (SOH) estimation method for lithium batteries that uses a dual-sliding-mode observer is presented. The capacity fade and resistance deterioration were estimated by the dual-sliding-mode observer. The dual-sliding-mode observer consists of a fast-paced time-varying observer and a slow-paced time-varying observer. The fast-paced time-varying observer estimates parameters, such as the state of charge and terminal voltage, and polarization effects. The slow-paced time-varying observer estimates the SOH in terms of the capacity fade and resistance deterioration. The convergence of the proposed observer was proved by the Lyapunov equation. The structure of the proposed system is simple and easy to implement and shows robust control properties against modeling errors and temperature variations. The test results show that the proposed observer system has superior tracking performance than previous ampere-counting method.

Published in:

Power Electronics, IEEE Transactions on  (Volume:25 ,  Issue: 4 )

Date of Publication:

April 2010

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