An adaptive boosting charging strategy optimization based on thermoelectric-aging model, surrogates and multi-objective optimization

This paper presents an adaptive boosting charging strategy incorporating the capacity estimation method based on the operation parameters, which is used for the state estimation and the adaptive adjustment of the charging strategy during the charging/discharging cycling process. Firstly, a coupling thermoelectric-aging battery model involving second-order resistor-capacity equivalent circuit model, two-state thermal model, semi-empirical aging models is set up for the simulation purpose. Secondly, numerical surrogate models describing the charging time and capacity loss in different aging states and charging strategies and a capacity estimation model are generated based on the coupling battery model, design of experiment method and artificial intelligence method. Subsequently, a multi-objective optimization framework based on surrogate models and the second non-dominated sorting genetic algorithm is used to solve the optimization problem of the boosting charging strategy to balance the charging time and capacity attenuation under different aging states. Finally, the simulation of the processes of capacity estimation and charging parameter optimal selection is carried on, and the simulation and comparison of the charging/discharging cycles applying the proposed and standard constant current constant voltage charging strategy are conducted. The results show that the proposed strategy can restrict the capacity loss at 4.44% which is 4.2% higher than the capacity loss by applying standard CCCV, the average charging time decreases from 3792.3 s to 2881.4 s. The average temperature increment is increased significantly, while it is still in the ideal operating temperature, and the average charging time can be significantly decreased. Based on this work, further researches can be conducted to develop the actual boosting charging management systems including aging state estimation and adaptive charging parameter selection.