Energy Storage Science and Technology ›› 2023, Vol. 12 ›› Issue (1): 209-217.doi: 10.19799/j.cnki.2095-4239.2022.0508

• Energy Storage Test: Methods and Evaluation • Previous Articles     Next Articles

Integrating model- and data-driven methods for accurate state estimation of lithium-ion batteries

Qingyang CHEN1(), Yinghui HE1, Guanding YU1(), Mingyang LIU2, Chong XU2, Zhenming LI2   

  1. 1.College of Information and Electronic Engineering, Zhejiang University, Hangzhou 310058, Zhejiang, China
    2.Energy Storage and Novel Technology of Electrical Engineering Department, China Electric Power Research Institute Co. , Ltd. , Beijing 100192, China
  • Received:2022-09-07 Revised:2022-09-23 Online:2023-01-05 Published:2023-02-08
  • Contact: Guanding YU E-mail:22231156@zju.edu.cn;yuguanding@zju.edu.cn

Abstract:

Addressing the inadequacies of the conventional model- and data-driven methods, an integrating strategy combining both methods, for accurate state estimation of lithium-ion batteries is proposed for estimating battery state-of-charge. After establishing the classical second-order battery model, a dual-Kalman filter, composed of an extended Kalman filter and an unscented Kalman filter, was used to estimate the status of the lithium battery system preliminarily. Then, the preliminary estimation results were input into the LSTM neural network to correct the errors and complete the data-driven part. Datasets from NASA PCoE were used to test the performance of the single-and dual-driven methods. Results show that the integrating method reduces the dependence of the estimation system on the data while improving the estimation accuracy and robustness because it combines the advantages of the model-and data-driven methods and makes up for their shortcomings. Satisfactory results were obtained.

Key words: lithium battery, state of charge, state of health, model-driven method, data-driven method, extended Kalman filter, unscented Kalman filter, long-short-term neural network

CLC Number: