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Investigation of the impact of battery stack monitor accuracy on EKF-based SoC estimation algorithms for electric vehicles

This paper investigates the impact of battery voltage monitor system accuracy on the performance of sophisticated battery control algorithms such as extended-Kalman-filter (EKF) based state-of-charge (SoC) estimation. Extensive research has been done on improving algorithm and cell model accuracy. However, there has been less focus on the effect of cell voltage measurement errors on the estimation performance in real world applications. In battery management systems (BMS), the battery stack monitor is the dedicated voltage monitoring device that monitors the cell voltages. Poor monitor accuracy can significantly impact algorithms and cell models. This paper discusses the important role of the cell voltage measurement accuracy in a quantitative manner and demonstrates that a high precision monitor system is critical to ensure accuracy of sophisticated algorithms and cell models.