A Li-Ion Battery State of Charge Estimation Strategy Based on the Suboptimal Multiple Fading Factor Extended Kalman Filter Algorithm

Author:

Wu Weibin1,Zeng Jinbin1,Jian Qifei2,Tang Luxin2,Hou Junwei3,Han Chongyang1,Song Qian1,Luo Yuanqiang1

Affiliation:

1. College of Engineering, South China Agricultural University, Guangzhou 510642, China

2. College of Intelligent Manufacturing and Electrical Engineering, Guangzhou Institute of Science and Technology, Guangzhou 526100, China

3. College of Automobile and Engineering Machinery, Guangdong Communication Polytechnic, Guangzhou 510650, China

Abstract

The state of charge (SOC) is an important indicator for evaluating a battery management system (BMS), which is crucial for the reliability, performance, and life management of a battery. In this paper, the characteristics of a Li-ion battery are deeply studied to explore the charge/discharge curve under different environments. Meanwhile, a second-order RC equivalent circuit model is constructed. The function identification of the EMF and SOC is performed based on the least squares method. The model estimation error is verified by simulation to be less than 0.05 V. Based on the Suboptimal Multiple Fading Factor Extended Kalman Filter (SMFEKF) algorithm, the SOC under constant current and UDDS conditions are estimated. Matlab/simulink simulations illustrate that the estimated accuracy of the proposed algorithm is improved by 79.36% compared with the EKF algorithm. Finally, the validity of the algorithm is verified jointly with the BMS. The results show that the estimation error is within 4% in both constant current condition as well as UDDS conditions, and it can still be predicted quickly and accurately under the uncertainty in the initial value of the SOC.

Funder

Key Technologies R&D Program of Guangdong Province

Department of Education of Guangdong Province Project

Publisher

MDPI AG

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