在二次電池應用的領域中，因電池模組具有高擴充性、高可靠度與替換方便等特點而被重視，電池之間不平衡的現象亦可藉由控制電池模組之充放電流而改善。傳統電池模組平衡方法強調以中央控制電路監控每個電池模組之電量，並加以分配其輸出電流以達成平衡的效果，此法存在電池電量(State of Charge - SOC)估測不易與控制複雜等待突破點。故本論文以電池模組為研究主題，提出以數個電池模組及系統控制電路構成之電池系統，並利用一新的電池模組平衡控制方法。本電池系統由系統控制電路調整電池模組之輸入/出功率以調整電池系統輸入電流或輸出電壓。此平衡方法具有提高總體放電量、控制簡單、可靠度高和不須估測電池電量等優點。本論文使用磷酸鐵鋰電池搭配一雙向昇/降壓電路構成電池模組，系統控制電路以類比IC實現，達成電池系統輸出直流定電壓或對電池模組進行充電。並以充放電實驗驗證本電池系統之電池平衡效果、系統可靠度及充放電量特性。

Battery power module (BPM) plays an important role in the applications of rechargeable batteries for its great flexibility and high reliability. Moreover, the unbalance phenomenon between batteries in different BPMs can be eliminated by controlling the power flow though BPMs. In conventional BPM balancing method, the output current between BPMs is distributed according to the state of charge (SOC) of each BPM. However, the accurate SOC is difficult to evaluate and the control scheme for battery balance is very complex. In order to solve these problems, this thesis proposes a battery system composed of several BPMs and a central control circuit with a novel battery balancing method. The control circuit of the battery system manages the input current/output voltage by adjusting the input/output power of battery modules. There are many advantages in the proposed method, including large total discharging capacity, simple control scheme, highly reliable and can be achieved without evaluating SOC. The BPM in this thesis is composed of four LiFePO4 batteries and a bidirectional converter. The central control circuit in the BPM is realized by using an analog IC to regulate the output voltage of the system or achieve the charging function of BPMs. Finally, the experimental results of the battery charging/discharging verify the feasibility of the proposed battery balancing method and high system reliability.

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