隨著科技日新月異，產品推陳出新，鋰離子電池以其優越的特性包括高能量密度、低維護成本、高操作電壓、低自放率及無記憶效應等，遂成為市場眾多電子產品的電源首選。而鋰離子電池的充電效率及壽命與其充電波形品質息息相關。換言之，若要同時達到縮短充電時間及延長電池壽命之目的，則勢必要取得一理想充電波形以最佳化電池性能。
本論文利用田口方法及模糊控制為架構，以獲取一理想充電波形。論文中第一部分說明利用連續直交表技術以取得五階段定電流法各階段最佳電流設定值的過程及方法，有關因子分析、實現步驟及變數設定等在文中均提供詳細說明。實驗結果顯示，本文所得之最佳五階段定電流充電法電流設定值能在130分鐘內將鋰離子電池回充至額定電量的95%，與傳統的定電流-定電壓(CC-CV)充電法比較，除了較短的充電時間及更安全的充電，更能延長鋰離子電池的循環壽命(Cycle Life)。論文中第二部分提出「模糊控制為基礎之五階段電流充電法(Fuzzy-Control-Based Five-Step Charging Algorithm, FCBFSCA)」，本方法以電池溫度作為電流控制指標以改善五階段定電流充電法之效率。為使FCBFSCA最佳化，本論文利用模糊田口法搜尋最佳輸出歸屬函數設定值。完成搜尋後亦進行確認實驗以證實所提出的模糊¬田口法之正確性¬。根據實驗結果，本論文所獲得之最佳輸出歸屬函數設定值其優點包括較短的充電時間及較高的充電容量。

Lithium-ion (Li-ion) batteries have emerged as the major power source for today’s electronic products because they can offer advantages such as high energy density, low maintenance requirement, high open circuit voltage (OCV), low self-discharge rate and lack of memory effect. The performance and lifespan of Li-ion batteries are closely related to the quality of the charging pattern. Therefore, an optimal charging pattern is essential for Li-ion batteries to achieve shorter charging time and longer cycle life.
In this dissertation, Taguchi method and Fuzzy control are utilized to obtain the optimal charging algorithms for Li-ion batteries. In the first part of this dissertation, consecutive orthogonal array (COA) technique is utilized to determine the optimal charging pattern for five-step constant current charging method. The problem formulation, implementation procedure and parameter setting method are described and explained in detail. Experimental results show that the obtained charging pattern is capable of charging the Li-ion batteries to 95% capacity in 130 minutes. Comparing to the conventional constant current–constant voltage (CC-CV) method, the benefits of the obtained pattern are faster and safer charging and longer battery cycle life. In the second part of this dissertation, a fuzzy-control-based five-step charging algorithm (FCBFSCA) is proposed. The proposed FCBFSCA takes the battery temperature into account and adjusts the charging current accordingly. To further improve the performance of the FCBFSCA, a fuzzy-based Taguchi method is utilized to obtain the optimal setting value of the output membership function. After the optimal setting value is acquired, a confirmation experiment is conducted to validate the effectiveness of the proposed fuzzy-based Taguchi method. According to the experimental results, the charging efficiency of the proposed system can be increased and the performance of the proposed charger can be improved. The advantages of the proposed method include shorter charging time and higher charged capacity.

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