后备电源用锂离子电池均衡控制的改进方法  

An Improved Method for Equalization Control of Lithium-ion Battery Backup Power System

作　　者：汤秀芬 米晨[2] TANG Xiufen;MI Chen(School of Physics and Electronic-Electrical Engineering,Ningxia University,Yinchuan 750021,China;Department of Asset and Laboratory Management,Ningxia University,Yinchuan 750021,China)

机构地区：[1]宁夏大学物理与电子电气工程学院,银川750021 [2]宁夏大学资产与实验室管理处,银川750021

出　　处：《实验室研究与探索》2020年第7期41-44,共4页Research and Exploration In Laboratory

基　　金：宁夏自然科学基金资助项目(NZ17047)。

摘　　要：针对锂离子电池组后备电源的均衡充电特性,选取易于采集的电池工作电压作为电池组均衡控制参数,据此设计制作了锂离子电池组均衡控制电路。设定3.4、3.5、3.6 V的3个不同均衡阈值电压分别对4只3.2 V 20 Ah磷酸铁锂电池组成的电池组进行0.1 C、0.25 C和0.5 C倍率的充电均衡测试,并记录每组电池的充电电流、电压和内阻。通过分析对比发现,同倍率的充电均衡阈值电压越大,均衡能耗越低,均衡速度越快。因此,重要场合的锂离子电池组后备电源系统宜采用大电流大阈值均衡控制方法,迅速有效地将电池组充满电,确保后备电源给设备提供稳定的电能。For lithium-ion battery backup power equalization charging particularity,easilycollectingbattery voltage was selected as the control parameterof lithium-ion battery,alithium-ion battery packequalization control circuitwas designed.According to three thresholds of voltage 3.4,3.5 and 3.6 V,the equalization experiments to lithium-ion battery groupat 0.1 C,0.25 C and 0.5 C rate were done,charging current,voltage andinternal resistancewere recorded.Through analysis and comparison,when the charging rate is thesame,the higher the threshold voltage is,the lower the energy consumption ofequalization,and also the faster the equalization speed.The importantlithium-ion battery backup power system should be adopted the equalization control method of largecharging current and large threshold value to quickly and effectively chargethe backup battery,to ensure that the backup power supply for equipment canprovide stable electricity.

关 键 词：锂离子电池 后备电源 均衡控制 

分 类 号：TM912.9[电气工程—电力电子与电力传动]