本論文提出適用於串聯鋰離子電池並以剩餘容量為基礎之平衡電路，本文所使用的功率級架構為雙向降升壓轉換器，可以實現兩個獨立電池之間的雙向能量傳輸。由於鋰離子電池開路電壓與剩餘容量(State of Charge, SOC)關係在SOC中段較為平坦，因此以SOC為基礎之平衡演算法將較常用的以電壓為基礎之平衡演算法更能精確的達到電量平衡。
然而對以SOC為基礎之平衡演算法而言，精確的SOC估測是必需的，因此本文提出一種以開路電壓為基礎之補償型SOC估測法來提高SOC估測的準確性。另一方面，若雙向降升壓轉換器的責任週期保持不變，則平衡電流會隨著剩餘容量差值的減小而降低;這將相對地增加平衡時間。針對這個問題，本論文另提出了責任週期調整法及曲線擬合法兩種平衡演算法，這些技術可以根據SOC差異的不同調整責任週期，並保持平衡電流幾乎恆定，與固定責任週期法和責任週期調整法相比，擬合調整法相對改善27.1％和18.6％的平衡時間。

In this thesis, a state-of-charge (SOC)-based equalizing circuit for series-connected lithium-ion batteries is proposed. The power stage utilized in this thesis is a bidirectional buck-boost converter. Using this topology, bidirectional energy transfers between two individual cells can be achieved. Comparing with voltage-based balancing strategies which are widely used in equalizing circuits, SOC-based balancing strategies are more effective due to the flatness of open circuit voltage (OCV) versus SOC characteristics. For SOC-based balancing algorithms, an accurate SOC estimation is essential. In this thesis, a compensated OCV-based SOC estimation method is proposed for improving the accuracy of SOC estimation.
However, if the duty cycle of the bidirectional buck-boost converter is kept constant, the balancing current will decrease as the SOC difference decreases; this will correspondingly increase the balancing time. To deal with this problem, two balancing algorithm named varied-duty-cycle method and curve-fitting method are proposed. These presented techniques can adjust the duty cycle value according to the SOC difference and keeps the balancing current nearly constant. Comparing with fixed-duty-cycle approach and varied-duty-cycle method, the curve-fitting method can improve the balancing time by 27.1 % and 18.6 %, respectively.

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