Load current and state of charge co-estimation for current sensor-free lithium-ion battery
Zhongbao Wei, Jian Hu, Hongwen He, Yang Li, and Binyu Xiong
Published in IEEE Transactions on Power Electronics, March 25, 2021 [Link]
Citation: Zhongbao Wei, Jian Hu, Hongwen He, Yang Li, and Binyu Xiong, "Load current and state of charge co-estimation for current sensor-free lithium-ion battery," IEEE Transactions on Power Electronics, vol. 36, no. 10, pp. 10970-10975, Oct. 2021, doi: 10.1109/TPEL.2021.3068725. [Copy]
The installation of current sensors on lithium-ion batteries (LIBs) can be challenging due to practical constraints in specific applications like portable electronics and smart batteries. Motivated by this, our letter proposes a method for online load current and state-of-charge (SOC) coestimation, which mitigates the need of installing the current sensor for LIB management. The essence is to transform the state observation into a constrained optimization problem, which is solved numerically in a moving horizon framework to allow the online coestimation of SOC and input current. Experimental results suggest that the proposed method can coestimate the load current and SOC of LIB precisely even if the current sensor is absent. The encouraging results are insightful for reducing the structural complexity and cost of future LIB utilization.