鋰電池組主動平衡電路設計

Design of an Active Balance Circuit for Lithium Battery Pack

郭立芳(Li-Fang Kuo)

指導教授 ： 張永農

國立虎尾科技大學/電機資訊學院/電機工程研究所/碩士(2013年)

摘要

本文提出一種主動式平衡電路架構，電路架構採用D類之串聯諧振轉換器，串聯多組變壓器，一次側與二次側用來做隔離與能量轉換之用途。各變壓器的主繞組分別並聯平衡控制開關以達到各組平衡之目的。本文以此架構建立等效電路設計聯立方程式與計算電路參數。諧振電路操作於電感性負載，使切換開關具有零電壓切換之功能。本研究實際製作8S1P串聯電池組之平衡電路，選用10Ah之磷酸鋰鐵電池，並將電池設置於不平衡下，進行實驗驗證主動式平衡電路之性能。

關鍵字

鋰電池 ； 諧振轉換器 ； 零電壓切換 ； 串聯電池組 ； 主動式平衡電路

並列摘要

This paper proposed a driving circuit for Lithium battery pack with balancing feature. The driving circuit consists of Class-D series resonant converter with multiple series transformers, on which primary windings are connected in series, while secondary sides are loaded by Lithium battery pack.The primary winding and secondary winding are used for the isolation and energy conversion. The load equivalent circuit is based on fundamental analysis to derive design equations and processes. Zero-voltage switching(ZVS) is operated on the active power switches. The unbalanced cell can be balanced individually. The prototype circuit is designed for series-connected LiFePO4 battery pack 24V(8S1P), and which has been built and tested to verify the analytical predictions.

並列關鍵字

Lithium battery pack ； resonant converter ； zero-voltage switching (ZVS) ； series-connected battery ； active balance circuit

參考文獻

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