Estimation of SOC in Lithium-Iron-Phosphate Batteries Using an Adaptive Sliding Mode Observer with Simplified Hysteresis Model during Electric Vehicle Duty Cycles

This paper develops a model for lithium-ion batteries under dynamic stress testing (DST) and federal urban driving schedule (FUDS) conditions that incorporates associated hysteresis characteristics of 18650-format lithium iron-phosphate batteries. Additionally, it introduces the adaptive sliding mod...

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Bibliographic Details
Published inBatteries (Basel) Vol. 10; no. 5; p. 154
Main Authors Chang, Yujia, Li, Ran, Sun, Hao, Zhang, Xiaoyu
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 01.05.2024
Subjects
Accuracy
Algorithms
Convergence
Electric vehicles
Energy industry
Estimation theory
extended Kalman filter
hysteresis model
Hysteresis models
Iron
Lithium
Lithium cells
Lithium-ion batteries
lithium-iron-phosphate batteries
Methods
Parameter identification
Parameters
Rechargeable batteries
Reliability (Engineering)
Robustness
sliding mode observer
State of charge
China
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Summary:This paper develops a model for lithium-ion batteries under dynamic stress testing (DST) and federal urban driving schedule (FUDS) conditions that incorporates associated hysteresis characteristics of 18650-format lithium iron-phosphate batteries. Additionally, it introduces the adaptive sliding mode observer algorithm (ASMO) to achieve robust and swiftly accurate estimation of the state of charge (SOC) of lithium-iron-phosphate batteries during electric vehicle duty cycles. The established simplified hysteresis model in this paper significantly enhances the fitting accuracy during charging and discharging processes, compensating for voltage deviations induced by hysteresis characteristics. The SOC estimation, even in the face of model parameter changes under complex working conditions during electric vehicle duty cycles, maintains high robustness by capitalizing on the easy convergence and parameter insensitivity of ASMO. Lastly, experiments conducted under different temperatures and FUDS and DST conditions validate that the SOC estimation of lithium-iron-phosphate batteries, based on the adaptive sliding-mode observer and the simplified hysteresis model, exhibits enhanced robustness and faster convergence under complex working conditions and temperature variations during electric vehicle duty cycles.
ISSN:2313-0105
2313-0105
DOI:10.3390/batteries10050154