隨著綠能產業蓬勃發展，不論是電動載具或3C家電，大多以鋰離子電池作為儲能裝置，故如何以快速且安全的充電方式對電池充電是關鍵的議題。本文以鋰離子電池為研究對象，考量五個因素包含充電時間、正規化放電容量、充電效率、電池平均溫升以及能量損耗，用以尋找四階段定電流最佳的充電模式。本論文以田口方法為基礎，評估三種搜尋充電電流的機制，再與定電流定電壓法以及其他四階段定電流充電模式作比較。由結果得知，與定電流定電壓法比較時，本文方法在正規化放電容量、電池平均溫升、能量損耗較不佳，但換來較短充電時間與較高充電效率；而與其他四階段定電流充電模式比較時，本文方法在充電時間較長且能量損耗較大，但正規化放電容量與充電效率皆較佳且電池平均溫升較低。

With the green energy industry booming, whether in electric vehicles or 3C appliances, most of them use li-ion batteries to store energy. Thus, how to charge batteries with a fast and safe method has become a key issue. This thesis proposes an optimal four-stage constant current charging (4SCC) pattern by considering five factors including charging time, normalized discharge capacity, charging efficiency, normalized average temperature rise, and normalized energy loss for Li-ion batteries. Three mechanisms are assessed for searching the 4SCC charging current based on Taguchi method. According to the results, the performances of normalized discharge capacity, average temperature rise and energy loss for the proposed 4SCC charging method are less than those using the constant-current constant-voltage (CCCV) method, but in exchange for shorter charging time and higher charging efficiency. As compared with other 4SCC charging methods, the proposed charging method has longer charging time and larger energy loss but it has better normalized discharge capacity, higher charging efficiency, and lower average temperature rise.

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