Improved Compound Correction-Electrical Equivalent Circuit Modeling and Double Transform-Unscented Kalman Filtering for the High-Accuracy Closed-Circuit voltage and State-of-Charge Co-Estimation of Whole-Life-Cycle Lithium-Ion batteries

Shunli Wang*, Paul Takyi-Aninakwa, Chunmei Yu, Siyu Jin, Carlos Fernandez

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

6 Citations (Scopus)
5 Downloads (Pure)

Abstract

For complex energy storage conditions, it is necessary to monitor the state-of-charge (SOC) and closed-circuit voltage (CCV) status accurately for the reliable power supply application of lithium-ion batteries. Herein, an improved compound correction-electrical equivalent circuit modeling (CC-EECM) method is proposed by considering the influencing effects of ambient temperature and charge–discharge current rate variations to estimate the CCV. Then, an improved adaptive double transform-unscented Kalman filtering (ADT-UKF) method is constructed with recursive sampling data correction to estimate the nonlinear SOC. A dynamic window function filtering strategy is constructed to obtain the new sigma point set for the online weighting coefficient correction. For a temperature range of 5–45 °C, the CCV for the improved CC-EECM responds well with a maximum error of 0.008608 V, and the maximum SOC estimation error is 6.317%. The proposed ADT-UKF method improves the CCV and SOC estimation reliability and adaptability to the time-varying current rate, temperature, and aging factors.

Original languageEnglish
Article number2200921
JournalEnergy Technology
Volume10
Issue number12
ISSN2194-4288
DOIs
Publication statusPublished - Dec 2022

Bibliographical note

Funding Information:
The work is supported by the National Natural Science Foundation of China (No. 62173281).

Publisher Copyright:
© 2022 Wiley-VCH GmbH.

Keywords

  • adaptive double transform-unscented Kalman filter
  • closed-circuit voltage
  • compound correction-electrical equivalent circuit modeling
  • lithium-ion batteries
  • state-of-charge

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