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Design of Lithium-Ion Battery Charge-Discharge Control System Based on SOC Adaptive Switching

Author(s)

Wen Li1, Jingyan Min1, Jiashun Zhu1,*, Xinyu Miao2, Tiansheng Sun1

Affiliation(s)

1School of Electrical Engineering, Yingkou Institute of Technology, Yingkou, China 2Yingkou Abe Wiring Co., Ltd. Yingkou, China *Corresponding Author

Abstract

This paper designs a lithium-ion battery charge-discharge control system based on a bidirectional DC/DC converter. The model consists of a lithium-ion battery, a DC voltage source, a bidirectional DC/DC converter, and a load, and has two working states: when the battery is discharging, it supplies power to the load, and the DC voltage source does not work; when charging, the DC voltage source supplies power to the load and charges the battery at the same time. The mode switching supports both manual and automatic methods: manual switching is realized by modifying the charge-discharge signal; automatic switching is based on SOC. When SOC > 80%, it switches to the discharge mode, and when SOC < 30%, it switches to the charge mode. The initial state is discharge, which is controlled by Stateflow. The charging mode adopts constant voltage control, with the open-circuit voltage when SOC=80% as the reference, and the PI controller outputs the charging reference current; the discharge mode maintains the load voltage at 48V, and the PI controller outputs the discharge reference current. The reference current is selected by the switch module according to the Signal, which serves as the first loop of the dual-closed-loop control of the bidirectional DC/DC converter. The second loop PI controller adjusts the duty cycle of the MOS tube to achieve precise control, ensuring battery safety and load stability.

Keywords

Lithium-Ion Battery; SOC Adaptive Switching; Bidirectional DC/DC Converter

References

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