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Optimization of multi-stage constant current charging pattern based on Taguchi method for Li-Ion battery
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DOI：10.1016/j.apenergy.2019.114148.png)
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Abstract
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Due to the complexity of characteristics, the charging performance of Li-ion batteries needs to be further improved. In this paper, Taguchi method is employed to search an optimal charging pattern for 5-stage constant-current charging strategy. The charging capacity, efficiency and time are analyzed as quality functions simultaneously, and the influences of charging currents at each stage on each quality function are revealed. This universal method provides a reasonable basis for the selection of the optimal currents. By reasonably updating the currents at each stage, a broader range is searched to make experimental results more representative. Compared with the constant current- constant voltage method, the obtained charging pattern improves the charging efficiency by 0.6-0.9%, and the temperature rise of the battery is reduced by about 2 degrees C. Compared with the charging pattern obtained by optimizing the charging time and capacity, the charging pattern obtained in this paper improved the charging efficiency by 2.8%, the temperature rise is reduced by 9.3 degrees C, and the charging capacity is basically the same.
Keywords:
Li-ion battery
Charging strategy
Multi-stage constant current
Orthogonal array
Taguchi method
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