State-of-Charge Estimation for Power Li-ion Battery Pack Using Vmin-EKF
An accurate estimation of State-of-Charge (SOC) for power battery pack is very important in the applications of electrical vehicles. Single cell model is not suitable for battery pack of multi cells. Considering the imbalance characteristic of serial connected battery pack, a Vmin model is proposed. The minimal cell load voltage of the battery pack ( Vmin) is used as the model measurement variable, and SOC is used as the model state variable. Based on the Vmin state space model, the extended Kalman filter (EFK) approach is applied to get the recursive estimation of the battery packs SOC. Experiments were made to simulate the behaviors of battery pack in the driving conditions.The results showed that accurate and real-time estimation of SOC could be obtained through this approach.
power Li-ion battery pack state-of-charge Vmin model EKF
Xintian Liu Yao He Zonghai Chen
Department of Automation University of Science and Technology of China Hefei,China
国际会议
成都
英文
192-196
2010-06-23（万方平台首次上网日期，不代表论文的发表时间）