An Online SOC and SOH Estimation Model for Lithium-Ion Batteries

Shyh-Chin Huang, Kuo-Hsin Tseng, Jin-Wei Liang, Chung-Liang Chang and Michael G. Pecht
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Shyh-Chin Huang: Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
Kuo-Hsin Tseng: Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
Jin-Wei Liang: Department of Mechanical Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
Chung-Liang Chang: Center for Reliability Engineering, Ming Chi University of Technology, New Taipei City 24301, Taiwan
Michael G. Pecht: Center for Advanced Life Cycle Engineering, University of Maryland, College Park, MD 20742, USA

Energies, 2017, vol. 10, issue 4, 1-18

Abstract: The monitoring and prognosis of cell degradation in lithium-ion (Li-ion) batteries are essential for assuring the reliability and safety of electric and hybrid vehicles. This paper aims to develop a reliable and accurate model for online, simultaneous state-of-charge (SOC) and state-of-health (SOH) estimations of Li-ion batteries. Through the analysis of battery cycle-life test data, the instantaneous discharging voltage (V) and its unit time voltage drop, V?, are proposed as the model parameters for the SOC equation. The SOH equation is found to have a linear relationship with 1/V? times the modification factor, which is a function of SOC. Four batteries are tested in the laboratory, and the data are regressed for the model coefficients. The results show that the model built upon the data from one single cell is able to estimate the SOC and SOH of the three other cells within a 5% error bound. The derived model is also proven to be robust. A random sampling test to simulate the online real-time SOC and SOH estimation proves that this model is accurate and can be potentially used in an electric vehicle battery management system (BMS).

Keywords: Li-ion battery; battery prognosis; online SOC and SOH estimation model (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2017
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (24)

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