鋰電池平衡電路與管理系統設計

Design of Equalization Circuit and Management System for Lithium-ion Battery

游木燦(Mu-Tsan Yu)

指導教授 ： 劉煥彩

國立虎尾科技大學/電機資訊學院/電機工程研究所/碩士(2011年)

摘要

本研究論文提出鋰電池平衡電路及管理系統設計，平衡電路針對四串之鋰電池組，提供完整的監控管理、電量平衡機制，利用PowerPump電量平衡的技術，使用降升壓(Buck-Boost)轉換器的原理，在各種情況下將高電位電池的電荷在有效時間內轉移至鄰近低電量的電池，其原理藉由MOSFET的切換將相鄰兩電池間電壓較高者之電荷儲存於電感，電感上的能量經平衡電流之路徑轉移其電量較低之電池來達成串聯電池組電量之平衡。
平衡電路將以德州儀器bq78PL116作為電池控制器，負責平衡控制平衡電路工作、監控電壓、溫度等資訊，具有過電壓保護、過電流保護、短路保護及溫度保護之機制，讓電池能在最安全模式之下進行充電。使用者介面則以QVGA模組為顯示裝置，利用SMBus通訊將電池控制器的資訊回傳至微控制器，以達完善之管理系統設計，並提升電池充放電上的安全性，改善電池組的性能及循環壽命。

關鍵詞：鋰電池、降升壓轉換器、電池平衡、串聯電池組、過電壓

關鍵字

鋰電池 ； 降升壓轉換器 ； 電池平衡 ； 串聯電池組 ； 過電壓

並列摘要

The purpose of thesis is to design an equalization circuit and management system for lithium-ion battery, This battery management system designed for managing 4-series-cell battery systems, provide a complete battery system control and battery capacity balancing mechanism. PowerPump technology is a feature that transfers charge efficiently between cells using a buck-boost converter principle during all operating condition, through the MOSFET switch transfer the energy stored in the inductor to achieve the equalization for series-connected batteries, the energy which stored in inductor via the balance current path transfer to low voltage battery to achieve the series-connected battery cell balance. The equalization circuit use Texas Instruments bq78PL116 as battery controller, it response to balancing control and monitor the voltage, temperature, it also have over-voltage protection, over-current protection, short circuit protection and thermal protection, the battery can get the safety of charging. The battery information interface use QVGA as the display device, the battery communicates the info to QVGA controller via the SMBus interface, reach the complete management system design, and promote the safety in the battery charge and discharge condition, improve the battery performance and life cycle.

Keywords：Lithium Battery、 Buck-Boost Converter、Battery Equalization、
Series-connected Batteries、Overvoltage

並列關鍵字

Lithium Battery ； Buck-Boost Converter ； Battery Equalization ； Series-connected Batteries ； Overvoltage

參考文獻

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