An Improved Multi-Timescale AEKF–AUKF Joint Algorithm for State-of-Charge Estimation of Lithium-Ion Batteries

Aihua Wu, Yan Zhou, Jingfeng Mao (), Xudong Zhang and Junqiang Zheng
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Aihua Wu: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Yan Zhou: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Jingfeng Mao: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Xudong Zhang: School of Mechanical Engineering, Nantong University, Nantong 226019, China
Junqiang Zheng: School of Mechanical Engineering, Nantong University, Nantong 226019, China

Energies, 2023, vol. 16, issue 16, 1-24

Abstract: State-of-charge (SoC) estimation is one of the core functions of battery energy management systems. An accurate SoC estimation can guarantee the safe and reliable operation of the batteries system. In order to overcome the practical problems of low accuracy, noise uncertainty, poor robustness, and adaptability in parameter identification and SoC estimation of lithium-ion batteries, this paper proposes a joint estimation method based on the adaptive extended Kalman filter (AEKF) algorithm and the adaptive unscented Kalman filter (AUKF) algorithm in multiple time scales for 18,650 ternary lithium-ion batteries. Based on the slowly varying characteristics of lithium-ion batteries’ parameters and the quickly varying characteristics of the SoC parameter, firstly, the AEKF algorithm was used to online identify the parameters of the model of batteries with a macroscopic time scale. Secondly, the identified parameters were applied to the AUKF algorithm for SoC estimation of lithium-ion batteries with a microscopic time scale. Finally, the comparative simulation experiments were implemented, and the experimental results show the proposed joint algorithm has higher accuracy, adaptivity, robustness, and self-correction capability compared with the conventional algorithm.

Keywords: SoC estimation; online parameter identification; adaptive unscented Kalman filter; adaptive extended Kalman filter; multiple time scales (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: 2023
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