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- Title
State-of-Charge Estimation of Lithium-Ion Batteries Based on Fractional-Order Square-Root Unscented Kalman Filter.
- Authors
Chen, Liping; Wu, Xiaobo; Tenreiro Machado, José A.; Lopes, António M.; Li, Penghua; Dong, Xueping
- Abstract
The accuracy of the state-of-charge (SOC) estimation of lithium batteries affects the battery life, driving performance, and the safety of electric vehicles. This paper presents a SOC estimation method based on the fractional-order square-root unscented Kalman filter (FSR-UKF). Firstly, a fractional second-order Resistor-Capacitance (RC) circuit model of the lithium battery is derived. The accuracy of the parameterized model is verified, revealing its superiority over integer-order standard descriptions. Then, the FSR-UKF algorithm is developed, combining the advantages of the square-root unscented Kalman filter and the fractional calculus. The effectiveness of the proposed algorithm is proven under a variety of operational conditions in the perspective of the root-mean-squared error, which is shown to be below 1.0 % . In addition, several experiments illustrate the performance of the FSR-UKF.
- Subjects
LITHIUM cells; ELECTRIC vehicles; KALMAN filtering; ESTIMATION theory; STANDARD deviations
- Publication
Fractal & Fractional, 2022, Vol 6, Issue 2, p52
- ISSN
2504-3110
- Publication type
Article
- DOI
10.3390/fractalfract6020052