Advances in Manufacturing ›› 2015, Vol. 3 ›› Issue (3): 202-211.doi: 10.1007/s40436-015-0116-3

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Modeling and state of charge estimation of lithium-ion battery

Xi-Kun Chen, Dong Sun   

  1. School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, People's Republic of China
  • 收稿日期:2014-06-23 修回日期:2015-07-01 出版日期:2015-09-25 发布日期:2015-07-29
  • 通讯作者: Dong Sun E-mail:sundyfirst@126.com,sundyfirst@shu.edu.cn
  • 基金资助:

    Project supported by the National High Technology Research and Development of China 863 Program (Grant No. 2011AA11A247).

Modeling and state of charge estimation of lithium-ion battery

Xi-Kun Chen, Dong Sun   

  1. School of Mechatronics Engineering and Automation, Shanghai University, Shanghai 200072, People's Republic of China
  • Received:2014-06-23 Revised:2015-07-01 Online:2015-09-25 Published:2015-07-29
  • Contact: Dong Sun E-mail:sundyfirst@126.com,sundyfirst@shu.edu.cn
  • Supported by:

    Project supported by the National High Technology Research and Development of China 863 Program (Grant No. 2011AA11A247).

摘要: Modeling and state of charge (SOC) estimation of lithium-ion (Li-ion) battery are the key techniques of battery pack management system (BMS) and critical to its reliability and safety operation. An auto-regressive with exogenous input (ARX) model is derived from RC equivalent circuit model (ECM) due to the discrete-time characteristics of BMS. For the time-varying environmental factors and the actual battery operating conditions, a variable forgetting factor recursive least square (VFFRLS) algorithm is adopted as an adaptive parameter identification method. Based on the designed model, a SOC estimator using cubature Kalman filter (CKF) algorithm is then employed to improve estimation performance and guarantee numerical stability in the computational procedure. In the battery tests, experimental results show that CKF SOC estimator has a more accuracy estimation than extended Kalman filter (EKF) algorithm, which is widely used for Li-ion battery SOC estimation, and the maximum estimation error is about 2.3%.

关键词: Lithium-ion (Li-ion) battery, Variable forgetting factor recursive least square (VFFRLS), Cubature Kalman filter (CKF), Extended Kalman filter (EKF)

Abstract: Modeling and state of charge (SOC) estimation of lithium-ion (Li-ion) battery are the key techniques of battery pack management system (BMS) and critical to its reliability and safety operation. An auto-regressive with exogenous input (ARX) model is derived from RC equivalent circuit model (ECM) due to the discrete-time characteristics of BMS. For the time-varying environmental factors and the actual battery operating conditions, a variable forgetting factor recursive least square (VFFRLS) algorithm is adopted as an adaptive parameter identification method. Based on the designed model, a SOC estimator using cubature Kalman filter (CKF) algorithm is then employed to improve estimation performance and guarantee numerical stability in the computational procedure. In the battery tests, experimental results show that CKF SOC estimator has a more accuracy estimation than extended Kalman filter (EKF) algorithm, which is widely used for Li-ion battery SOC estimation, and the maximum estimation error is about 2.3%.

Key words: Lithium-ion (Li-ion) battery, Variable forgetting factor recursive least square (VFFRLS), Cubature Kalman filter (CKF), Extended Kalman filter (EKF)