由於串聯電池組內的電池之間具有不同的化學特性，在充放電過程中，電池之間特性會漸漸偏移，使得電池之間出現了電量差距，若是不注意此現象，會造成電池損毀，產生安全上的疑慮。切換式電能轉換器平衡法較其他種的電量平衡法具有高功率、短時間與容易擴充等優點。本文提出了串聯電池組電量平衡系統，採用雙向返馳式轉換器做為硬體架構，並且搭配數位控制核心與通訊網路。數位控制核心透過通訊網路取得資料後，運算出電路控制命令，進而驅動雙向返馳式轉換器來達成直接電量轉移之目的。

Variability between batteries is caused by the manufacturing process,
which will increase by cycle life. It is very dangerous to ignore battery
cell’s degradation effect. Severe damage will happen to batteries and threat
user’s personal safety.
Compare to other charge balancing method, applying switching
power supply as charge balancing method has some advantages, such as
high balancing power, low balancing time and easy to expand. A
bi-directional flyback converter is applied as experimental platform for
charge equalization system. Digital control units and communication
network are also inserted in charge equalization system. Digital control
units will exchange data over communication network and generate a
control command to control bi-directional flyback converter. In the other
word, charge will be transferred between batteries by giving the control
command to bi-directional flyback converter and batteries will be
balanced.

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