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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Aihua Wu & Yan Zhou & Jingfeng Mao & Xudong Zhang & Junqiang Zheng, 2023. "An Improved Multi-Timescale AEKF–AUKF Joint Algorithm for State-of-Charge Estimation of Lithium-Ion Batteries," Energies, MDPI, vol. 16(16), pages 1-24, August.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:16:p:6013-:d:1218761
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    References listed on IDEAS

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    4. Diego Salazar & Marcelo Garcia, 2022. "Estimation and Comparison of SOC in Batteries Used in Electromobility Using the Thevenin Model and Coulomb Ampere Counting," Energies, MDPI, vol. 15(19), pages 1-13, September.
    5. Xiong, Rui & Sun, Fengchun & Chen, Zheng & He, Hongwen, 2014. "A data-driven multi-scale extended Kalman filtering based parameter and state estimation approach of lithium-ion olymer battery in electric vehicles," Applied Energy, Elsevier, vol. 113(C), pages 463-476.
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