本論文提出一新型串聯電池組平衡方法，此平衡方式以電池電壓為基準，當電池到達充電或放電額定電壓時才啟動平衡與保護機制，故不會有傳統平衡方式因電池電量狀態(state of charge, SOC)估測誤差造成平衡失效，使電池過度充電或過度放電。此外，因不需要偵測電流回授，故設計簡單及控制容易。本論文分析此平衡方式應用於串聯電池系統與電池模組系統之動作原理及能量傳遞方式，使用一具漏感能量回收之返馳式轉換器來實現並驗證其動作原理。最後使用4顆3.3 V 15 Ah磷酸鋰鐵電池做為串聯電池組再加上一雙向充放電路的構成一電池模組，將此平衡方法應用於該電池模組來驗證此平衡方法的可行性。

A novel balancing method for series connected batteries is proposed in this thesis. A balancing circuit applying this method is activated when the voltage of the corresponding cell reaches rated charge or discharge voltage. Based on the cell voltage, this method does not suffer the problem, occurring in conventional methods, of overcharge or overdischarge due to estimation errors of state-of-charge (SOC). In addition, the control circuit and designing process is simple without current feedback. The operating principles and energy transferring patterns for series connected batteries system and battery module system are analyzed. A flyback converter with the leakage inductance recycling mechanism is adopted as balancing circuit to realize the proposed method. Finally, a battery module composed of four series 3.3-V 15-Ah lithium iron phosphate (LiFePO4) batteries, balancing circuits for each battery, and a bidirectional converter is implemented to demonstrate the feasibility of the proposed balancing method.

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