一种基于推挽变换器的模块化电池均衡电路  

A Modularized Equalizer for Series-Connected Batteries Based on Push-Pull Converter

作　　者：刘倩怡 徐顺刚 许建平[1] 李小龙 覃福班 Liu Qianyi;Xu Shungang;Xu Jianping;Li Xiaolong;Qin Fuban(The Ministry of Education Key Laboratory of Magnetic Suspension Technology and Maglev Vehicle School of Electrical Engineering Southwest Jiaotong University Chengdu 610031 China)

机构地区：[1]西南交通大学电气工程学院磁浮技术与磁浮列车教育部重点实验室,成都610031

出　　处：《电工技术学报》2018年第14期3213-3221,共9页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(61371033);中央高校基本科研业务费专项资金(2682016CX035);成都市科技惠民技术研发项目(2016-HM01-00139-SF);磁浮技术与磁浮列车教育部重点实验室开放课题基金资助

摘　　要：在串联充放电过程中,动力电池组容易出现电池过充和过放现象,这会缩短电池组寿命并导致安全隐患,电池均衡电路能够消除电池差异对电池成组使用的影响,是提升动力电池组性能的重要手段。提出一种基于推挽变换器的模块化电池均衡电路,该均衡电路由多个推挽变换器均衡模块单元构成,只需同步控制每一个均衡模块的开关器件,便能实现能量从高电压电池到低电压电池的直接传输,缩短了能量传输路径。同时,通过采用交流耦合方式在各单体电池之间进行能量传递,消除了均衡模块间的交叉影响,增加了电路的可扩展性。对提出的均衡电路进行详细分析,并与现有的均衡电路进行性能对比,最后通过实验测试验证了理论分析的正确性。Overcharge and over-discharge of batteries may result in shorter lifetime and higher potential of security risk when they are connected in series to meet load voltage requirements.Therefore,equalization circuits are required for a series-connected battery string to eliminate individual difference among batteries in the battery pack.In this paper,a modularized equalizer based on push-pull converter is proposed.The proposed equalizer circuit can transfer energy from high voltage batteries to low voltage batteries directly to shorten the transmission path under synchronous control.Besides,it eliminates the magnetic coupling effects caused by multi-winding transformer and increases the circuit expansibility.In this paper,operating principles of the proposed circuit are analyzed.The performance comparisons with existing equalizer circuits are carried out.Finally,the theoretical analysis results are verified by experimental results.

关 键 词：模块化 同步控制 均衡电路 推挽电路 

分 类 号：TM911[电气工程—电力电子与电力传动]