本文以現有定電流快充方法大多存在對電池容量快速衰退的問題為出發點，提出一基於電池老化程度之定電流充電法，此法能隨電池容量衰退率的不同來決定相對應的充電電流大小，用以延緩快充對電池容量衰退的影響，進而延長電池壽命。本文內容包括電池老化程度的估測、基於不同老化程度的電流選擇及電池容量衰退的實驗等三項。因此，對某電池而言，可藉由量測電池開路端電壓及瞬間電壓變化來辨別它的老化程度，再利用所提出的基於老化程度電流法來計算新的充電電流值，最後透過容量衰退實驗來驗證與分析該方法對延緩電池老化速率的效益。由容量衰退實驗得知，當全新電池120次循環後，使用基於老化程度電流法之定電流充電法相較於原始定電流充電法可延緩容量衰退率約3.84%，等同於多出40~50的循環次數可使用。另外，當全新電池100次循環後，使用基於老化程度電流法之四階段定電流充電法相較於原始四階段定電流充電法可延緩容量衰退率約2.55%，等同於多出30~40的循環次數可使用。綜言之，基於老化程度的定電流充電法雖有助延緩電池容量衰退，但該法因需降低充電電流的大小，而會犧牲些許充電時間與充電效率。

In this study, an aging-based constant current charging method for lithium-ion batteries is proposed due to the problem of rapid decay in the constant current fast charging technology. The proposed method is able to determine the corresponding charging current associated with the capacity degradation and delay the impact of fast charging method on battery capacity degradation for extending the lifespan of batteries. This study consists of three parts including estimation of the degree of aging (DOA), selection of the aging-based charging current and experiment of battery capacity degradation. For a battery with an unknown state, its DOA can be estimated by measuring the open-circuit voltage and the instantaneous voltage change. Then the new charging current value can be calculated by the aging-based charging current selection. Finally, the experiment of battery capacity degradation was used to verify and analyze the effect of the method for reducing the aging rate of the battery. Experiment results show that the aging-based charging current was able to extend the capacity degradation of 3.84% as compared to the constant current charging after 120 cycles for brand new batteries, which is equivalent to 40-50 more cycles. Moreover, the four-stage constant current charging (4SCC) method with aging-based schematic was able to extend the capacity degradation of 2.55% after 100 cycles for brand new batteries, which is equivalent to 30-40 more cycles. In conclusion, although the aging-based charging current method may prolong the battery capacity degradation phenomenon, it may sacrifice a little charging time and charging efficiency due to the reduction of charging current.

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