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Abstract
Accurate estimation of the state of health (SOH) of batteries is essential for maximizing the lifetime of the battery and improving the safety and economy of any energy storage system. Data-driven methods can use measurement data to effectively estimate the SOH, but the estimation performance depends on the relevance between the selected feature and SOH. In this article, fuzzy entropy (FE) of battery voltage is proposed as a new feature for SOH estimation and validated on Li-ion batteries. Compared with the traditional sample entropy, the FE can capture the variation of voltage during the battery degradation more efficiently in terms of the parameter selection, data noise, data size, and test condition. Moreover, the aging temperature variation is involved in the established SOH estimator as the temperature is a disturbance variable in the real applications. The FE-SOH is used as the input-output data pair of the support vector machine, and a single-temperature model, a full-temperature model, and a partial-temperature model are established. As a result, the FE-based method has better estimation accuracy under aging temperature variation. The FE-based method also decreases the dependence on the size of the required training data. Finally, the effectiveness of the proposed method is verified by experimental results.
Original language | English |
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Article number | 9305691 |
Journal | I E E E Journal of Emerging and Selected Topics in Power Electronics |
Volume | 9 |
Issue number | 4 |
Pages (from-to) | 5125-5137 |
Number of pages | 13 |
ISSN | 2168-6777 |
DOIs | |
Publication status | Published - 2021 |
Keywords
- Aging
- Batteries
- Biological system modeling
- Entropy
- Estimation
- Iron
- Li-ion battery
- Support vector machines
- fuzzy entropy
- sample entropy
- short-term current pulse
- sample entropy (SE)
- state-of-health (SOH) estimation
- Aging temperature variation
- fuzzy entropy (FE)
Fingerprint
Dive into the research topics of 'Fuzzy Entropy-based State of Health Estimation for Li-Ion Batteries'. Together they form a unique fingerprint.Projects
- 1 Finished
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Robust State of Health Estimation for Lithium-ion Batteries using Machine Learning
Sui, X. (PI), Teodorescu, R. (Supervisor) & Stroe, D.-I. (Supervisor)
01/11/2018 → 31/10/2021
Project: PhD Project
Research output
- 43 Citations
- 1 PhD thesis
-
Robust State of Health Estimation for Lithium-Ion Batteries Using Machines Learning
Sui, X., 2021, Aalborg Universitetsforlag. 119 p.Research output: PhD thesis
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