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15 March 2024 Electric vehicle power battery fault diagnosis based on wavelet decomposition and modified Z-score model
Huili Zhang, Yuelong Pan, Jialong Ji
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Proceedings Volume 13075, Second International Conference on Physics, Photonics, and Optical Engineering (ICPPOE 2023); 130750R (2024) https://doi.org/10.1117/12.3025983
Event: Second International Conference on Physics, Photonics, and Optical Engineering (ICPPOE 2023), 2023, Kunming, China
Abstract
Since the capacity and voltage of a single lithium battery are very small, dozens of single batteries are usually connected in series and parallel to form a battery pack to provide sufficient energy for electric vehicles. However, with the popularity of electric vehicles, spontaneous combustion and explosion of lithium batteries due to faults in the batteries occur from time to time, seriously threatening the safety of people's lives and property. This paper takes the actual operation data of electric vehicles as the basis and uses the method of wavelet decomposition and reconstruction to reduce the noise of the data. Then through the improved Z-score model, the difference between a normal single battery and a faulty single is amplified, and the serial number of the faulty single battery is accurately identified, and the time of fault occurrence is determined. According to the diagnostic results, the method proposed in this paper, on the one hand, can identify the faulty cells in the early stage of the fault, on the other hand, it can reduce the fault false positive rate caused by the inconsistency of the cells.
(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.
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Huili Zhang, Yuelong Pan, and Jialong Ji "Electric vehicle power battery fault diagnosis based on wavelet decomposition and modified Z-score model", Proc. SPIE 13075, Second International Conference on Physics, Photonics, and Optical Engineering (ICPPOE 2023), 130750R (15 March 2024); https://doi.org/10.1117/12.3025983
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KEYWORDS
Batteries
Wavelets
Data modeling
Mathematical modeling
Diagnostics
Model based design
Systems modeling
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