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Academic Journal of Computing & Information Science, 2024, 7(5); doi: 10.25236/AJCIS.2024.070525.

SOC Estimation for Lithium-Ion Batteries Based on the AEKF-SVM Algorithm


Lei Zhang1, Qianqian Song2, Jie Li3

Corresponding Author:
Lei Zhang

1School of Network Engineering, Wuhu Institute of Technology, Wuhu, 241000, China

2College of Computer Science, Chongqing University, Chongqing, 400044, China

3School of Information and Artificial Intelligence, Wuhu Institute of Technology, Wuhu, 241000, China


In light of societal progress, energy has emerged as a critical concern, and new energy sources are poised to become the energy mainstream. Among these developments, lithium-ion batteries play a pivotal role in the new energy industry. Accurately estimating the State of Charge (SOC) of lithium-ion batteries is essential for the proper functioning of devices like electric vehicles. However, the SOC of lithium-ion batteries cannot be measured directly by instruments and can only be estimated by measurable variables. This paper proposes a new algorithm for accurate SOC estimation using a combination of adaptive extended Kalman filtering (AEKF) and support vector machine (SVM) algorithms, taking into account the characteristics of lithium-ion batteries. The AEKF algorithm was employed to estimate the State of Charge (SOC) under the Beijing Bus Dynamic Stress Test (BBDST) condition. By leveraging the adaptive noise covariance advantage of the AEKF algorithm, a model that is more fitting for the lithium-ion battery was obtained. Subsequently, the SOC for the Hybrid Pulse Power Characterization (HPPC) and Dynamic Stress Test (DST) conditions were predicted. Experimental results revealed that the SVM-AEKF algorithm, when used for SOC estimation, resulted in a maximum error of 0.037% under the HPPC condition, marking an improvement of 8.9% compared to the AEKF algorithm. Under the DST condition, the maximum error was 0.335%, indicating a 6.9% improvement over the AEKF algorithm. These results underscore the potential of the SVM-AEKF algorithm in accurately estimating SOC, thereby holding promise for practical applications.


power lithium battery; Thevenin; state of charge; adaptive extended Kalman filter; support vector machine

Cite This Paper

Lei Zhang, Qianqian Song, Jie Li. SOC Estimation for Lithium-Ion Batteries Based on the AEKF-SVM Algorithm. Academic Journal of Computing & Information Science (2024), Vol. 7, Issue 5: 190-198. https://doi.org/10.25236/AJCIS.2024.070525.


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