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A novel adaptive state of charge estimation method of full life cycling lithium-ion batteries based on the multiple parameter optimization.

Cao, Wen; Wang, Shun?Li; Fernandez, Carlos; Zou, Chuan?Yun; Yu, Chun?Mei; Li, Xiao?Xia


Wen Cao

Shun?Li Wang

Chuan?Yun Zou

Chun?Mei Yu

Xiao?Xia Li


The state of charge (SoC) estimation is the safety management basis of the packing lithium-ion batteries (LIB), and there is no effective solution yet. An improved splice equivalent modeling method is proposed to describe its working characteristics by using the state-space description, in which the optimization strategy of the circuit structure is studied by using the aspects of equivalent mode, analog calculation, and component distribution adjustment, revealing the mathematical expression mechanism of different structural characteristics. A novel particle adaptive unscented Kalman filtering algorithm is introduced for the iterative calculation to explore the working state characterization mechanism of the packing LIB, in which the incorporate multiple information is considered and applied. The adaptive regulation is obtained by exploring the feature extraction and optimal representation, according to which the accurate SoC estimation model is constructed. The state of balance evaluation theory is explored, and the multiparameter correction strategy is carried out along with the experimental working characteristic analysis under complex conditions, according to which the optimization method is obtained for the SoC estimation model structure. When the remaining energy varies from 10% to 100%, the tracking voltage error is less than 0.035 V and the SoC estimation accuracy is 98.56%. The adaptive working state estimation is realized accurately, which lays a key breakthrough foundation for the safety management of the LIB packs.


CAO, W., WANG, S.-L., FERNANDEZ, C., ZOU, C.-Y., YU, C.-M. and LI, X.-X. 2019. A novel adaptive state of charge estimation method of full life cycling lithiumā€ion batteries based on the multiple parameter optimization. Energy science and engineering [online], 7(5), pages 1544-1556. Available from:

Journal Article Type Article
Acceptance Date May 3, 2019
Online Publication Date May 20, 2019
Publication Date Oct 31, 2019
Deposit Date Jun 14, 2019
Publicly Available Date Jun 17, 2019
Journal Energy Science and Engineering
Print ISSN 2050-0505
Electronic ISSN 2050-0505
Publisher Wiley
Peer Reviewed Peer Reviewed
Volume 7
Issue 5
Pages 1544-1556
Keywords Full life cycle; Lithium-ion batteries; Multiple parameter optimization; Particle adaptive unscented Kalman filter; Splice equivalent model; State of charge estimation
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