本論文以三顆鋰離子電池串聯成電池組進行充電實驗，並探討鋰離子電池組基於各顆電池不同老化程度，以最佳化四階段定電流充電電流乘以電池當前剩餘容量的百分比，作為其電池的充電機制，而進行電池組充電實驗之前，需先探討電池組的平衡電路。本論文實驗是以降壓式轉換器作為電池與電源供應器之間的平衡電路，基於設定其功率開關的導通率，配合電源供應器的輸出電流，用以尋找所對應之電池充電電流值。本論文會先透過建立開關導通率、電源供應器的輸出電流與電池充電電流間的轉換關係，之後，將各顆電池完整充放電用以得知當前電池的老化程度，再接著依電池當前老化程度、功率開關的導通率與電源供應器的輸出電流大小來設定各顆電池的充電電流值，進而對電池組進行四階段定電流的充電。

In this thesis, three of lithium-ion batteries in series will be applied in the charging experiment, as aged lithium-ion batteries, they will be charged in the proportion of remaining capacity as considering the degree of aging (DOA). Before beginning the charging experiment, we should first discuss the balancing circuit of the batteries. This thesis selects a buck converter that is used as a connection between batteries and power supply. Based on the setting of the duty on MOSFET switches and the charging current of power supply, the corresponding charging current value can be found. In this thesis, one has to establish the relationship among the duty of MOSFET switches, the output current of power supply and the charging current of batteries. Then, the DOA of each battery can be determined via completely the charging and discharging processes. Next, the charging current value of each battery will be set according to the current aging degree of the battery, the conduction rate of the MOSFET switch and the output current of the power supply, so as to charge the battery pack with a four-stage constant current.

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