Equalization scheme for series connected Li-ion battery pack based on drop combination strategy

doi:10.12028/j.issn.2095-4239.2018.0179

Abstract

Abstract: In order to improve the speed and efficiency of the capacitive equalization method, a charge-discharge combination strategy for establishing voltage drop is proposed. The working process of the combination strategy and the conventional scheme is analyzed. The difference of equalization speed between the two schemes is compared. The equalization circuit is equivalent to the full-response RLC circuit. The relationship between energy loss rate and circuit parameters is analyzed by formula deduction and Matlab calculation. The effect of different charge-discharge combinations on equalization efficiency is compared. The results show that the drop combination strategy can significantly improve the speed of capacitive equalization, and the equalization efficiency can be improved by optimizing the charge-discharge combination. The proposed scheme is analyzed and verified by experiments. The results show that the method can effectively solve the problem of unbalanced battery pack.

Key words: flying-capacitor, combined type, equilibrium velocity, equilibrium efficiency

CLC Number:

TM912

WANG Minwang, WU Huawei, GE Xiaozhong. Equalization scheme for series connected Li-ion battery pack based on drop combination strategy[J]. Energy Storage Science and Technology, 2019, 8(1): 167-172.

References

[1] 鲁文凡, 吕帅帅, 倪红军, 等. 动力电池组均衡控制系统的研究进展[J]. 电源技术, 2017, 41(1):161-164. LU W F, LÜ S S, NI H J, et al. Research progress of equalization strategy system for power batteries[J]. Chinese Journal of Power Sources, 2017, 41(1):161-164.
[2] 徐顺刚, 王金平, 许建平. 一种延长电动汽车蓄电池寿命的均衡充电控制策略[J]. 中国电机工程学报, 2012, 32(3):43-48. XU S G, WANG J P, XU J P. An equalizing charge control strategy to extend battery cycle life for electric vehicles[J]. Proceedings of the CSEE, 2012, 32(3):43-48.
[3] 谢凯, 潘明, 张向文. 电动汽车动力电池主动均衡控制设计[J]. 计算机仿真, 2017, 34(6):156-161. XIE K, PAN M, ZhANG X W. Design of active equalization control for electric vehicle power battery[J]. Computer Simulation, 2017, 34(6):156-161.
[4] 熊亮. 大功率锂电池组多通道主动均衡技术研究[D]. 绵阳:西南科技大学, 2016. XIONG L. Research on multichannel active equalization technology for high power lithium battery[D]. Mianyang:Southwest University of Science and Technology, 2016.
[5] 刘倩怡, 徐顺刚, 许建平, 等. 一种基于推挽变换器的模块化电池均衡电路[J]. 电工技术学报, 2018(14):doi:10.1959/j.cnki. 1000-6753.tces.170659. LIU Q Y, XU S G, XU J P, et al. A modularized equalizer for series-connected batteries based on push-pull converter[J]. Transactions of China Electrotechnical Society, 2018(14):doi:10.1959/j.cnki.1000-6753.tces.170659.
[6] KIM M Y, KIM C H, KIM J H, et al. A chain structure of switched capacitor for improved cell balancing speed of lithium-ion batteries[J]. IEEE Transactions on Industrial Electronics, 2014, 61(8):3989-3999.
[7] 冯能莲, 陈龙科, 汤杰. 串联电池组电容式均衡系统研究[J]. 重庆理工大学学报, 2016, 30(1):1-6. FENG N L, CHEN L K, TANG J. Study on capacitive equalizing system for series battery[J]. Journal of Chongqing Institute of Technology, 2016, 30(1):1-6.
[8] 李泉, 周云山, 王建德, 等. 基于双层准谐振开关电容的锂电池组均衡方法[J]. 电工技术学报, 2017, 32(21):9-15. LI Q, ZHOU Y S, WANG J D, et al. Equalization method of lithium battery pack based on double-tiered quasi-resonant switched capacitor[J]. Transactions of China Electrotechnical Society, 2017, 32(21):9-15.
[9] 逯仁贵, 王铁成, 朱春波, 等. 基于飞渡电容的超级电容组动态均衡控制算法[J]. 哈尔滨工业大学学报, 2008, 40(9):1421-1425. LU R G, WANG T C, ZHU C B, et al. Dynamic equalization algorithm based on switched capacitor applied in super-capacitor stacks[J]. Journal of Harbin Institute of Technology, 2008, 40(9):1421-1425.
[10] 李仲兴, 余峰, 郭丽娜. 电动汽车用锂电池组均衡控制算法[J]. 电力电子技术, 2011, 45(12):54-56. LI Z X, YU F, GUO L N. Lithium-ion batteries equalization algorithm of electric vehicle[J]. Power Electronics, 2011, 45(12):54-56.
[11] 夏小东. 带有升降压变换器的飞渡电容式电池组均衡技术研究[D]. 哈尔滨:哈尔滨工业大学, 2011. XIA X D. Research on battery equalization using flying capacitor with buck-boost converter[D]. Harbin:Harbin Institute of Technology, 2011.
[12] 桂宇. 纯电动汽车锂动力电池组双向均衡控制策略研究及系统开发[D]. 长春:吉林大学, 2014. GUI Y. Research on bidirectional equalization strategy and system development for lithium-ion power battery pack of pure electric vehicle[D]. Changchun:Jilin University, 2014.

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