| Summary: | 碩士 === 國立成功大學 === 電機工程學系碩博士班 === 101 === 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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