Skip to main content

Research Repository

Advanced Search

The power state estimation method for high energy ternary lithium-ion batteries based on the online collaborative equivalent modeling and adaptive correction-unscented Kalman filter.

Fan, Yongcun; Wang, Shunli; Jiang, Cong; Fernandez, Carlos

Authors

Yongcun Fan

Shunli Wang

Cong Jiang



Abstract

Accurate power state estimation plays an important role in the real-time working state monitoring and safety control of high energy lithium-ion batteries. To solve the difficulty and low accuracy problems in its real-time power state estimation under various operating conditions, the working characteristics of the lithium cobalt oxide batteries are analyzed comprehensively under various operating conditions. An improved collaborative equivalent model is established to characterize its working characteristics and then the initial power state value is calibrated by using the experimental relationship between open circuit voltage and state of charge considering the importance of the precious estimation accuracy for the later iterate calculation and correction. And then, an adaptive correction - Unscented Kalman Filter algorithm is put forward and applied for the state of charge estimation and output voltage tracking so as to realize the real-time high-precision lithium-ion battery power state estimation. The experimental results show that the established model can predict the power state of high energy lithium-ion batteries conveniently with high convergency speed within 30 seconds, accurate output voltage tracking effect within 32 mV and high accuracy, the max estimation error of which is 3.87%, providing an effective working state monitoring and safety protection method in the cleaner production and power supply processes of the high energy lithium-ion batteries.

Citation

FAN, Y., WANG, S., JIANG, C. and FERNANDEZ, C. 2021. The power state estimation method for high energy ternary lithium-ion batteries based on the online collaborative equivalent modeling and adaptive correction-unscented Kalman filter. International journal of electrochemical science [online], 16(1), article ID 151020. Available from: https://doi.org/10.20964/2021.01.70

Journal Article Type Article
Acceptance Date Nov 5, 2020
Online Publication Date Nov 30, 2020
Publication Date Jan 31, 2021
Deposit Date Feb 19, 2021
Publicly Available Date Feb 19, 2021
Journal International Journal of Electrochemical Science
Print ISSN 1452-3981
Publisher Electrochemical Science Group
Peer Reviewed Peer Reviewed
Volume 16
Issue 1
Article Number 151020
DOI https://doi.org/10.20964/2021.01.70
Keywords High energy lithium-ion battery; Collaborative equivalent model; Power state estimation; Adaptive correction-unscented Kalman filter; Output voltage tracking
Public URL https://rgu-repository.worktribe.com/output/1206435

Files





You might also like



Downloadable Citations