A Multi-State Energy Equalizer and Control Methods for Series Battery System
Liu Hongrui1, Zhang Kaixiang1, Guo Yixuan1, Yin Rong1, Qian Jing2
1. Faculty of Electric Power Engineering Kunming University of Science and Technology Kunming 650500 China; 2. Faculty of Metallurgical and Energy Engineering Kunming University of Science and Technology Kunming 650500 China
Abstract：Aiming at the problems of unbalanced energy of individual cells in a large series lithium battery pack and the influence of individual cells on the charge and discharge capacity, this paper proposes a multi-state energy equalizer and its control method for a series battery system. The first and second balances in the static state are carried out at the same time for each battery unit, which improves the rate at which the energy of each battery unit in the series battery pack is consistent. In the third rebalance, three different equalization methods under three different states enable rapid energy transfer between battery cells and adjustable voltage sources, and the charging and discharging capacity of the series battery pack is improved. The structure of this equalizer is easy to modularize, the principle of equalization is simple, and the equalization speed is fast, and it is suitable for large-scale series battery pack systems. This article introduces the basic principles and control methods of the equalizer in detail, and builds an experimental platform for equalization experiments. The results prove the feasibility of the equalizer.
刘红锐, 张开翔, 郭奕旋, 尹荣, 钱晶. 一种串联蓄电池系统多重多状态能量均衡器及其控制方法[J]. 电工技术学报, 2020, 35(zk2): 652-660.
Liu Hongrui, Zhang Kaixiang, Guo Yixuan, Yin Rong, Qian Jing. A Multi-State Energy Equalizer and Control Methods for Series Battery System. Transactions of China Electrotechnical Society, 2020, 35(zk2): 652-660.
[1] Hannan M A, Hoque M M, Hussai A, et al.State-of-the-art and energy management system of lithium-ion batteries in electric vehicle applications: issues and recommend-dations[J]. IEEE Access, 2018, 6: 19362-19378. [2] 刘红锐, 张昭怀. 锂离子电池组充放电均衡器及均衡策略[J]. 电工技术学报, 2015, 30(8): 186-192. Liu Hongrui, Zhang Zhaohuai.The equalizer of charging and discharging and the balancing strategies for lithium-ion battery pack[J]. Transactions of China Electrotechnical Society, 2015, 30(8): 186-192. [3] Hua Chih-Chiang, Fang Yi-Hsiung, Li Pei-Hong.Charge equalisation for series-connected LiFePO4 battery strings[J]. IET Power Electronics, 2015, 8(6): 1017-1025. [4] 魏业文, 李应智, 曹斌, 等. 含Buck电路的锂电池低功耗电量均衡技术研究[J]. 电工技术学报, 2018, 33(11): 2575-2583. Wei Yewen, Li Yingzhi, Cao Bin, et al.Research on power equalization of lithium-ion batteries with less-loss buck chopper[J]. Transactions of China Electrotechnical Society, 2018, 33(11): 2575-2583. [5] Kakimoto N, Fujii Y.Inherent equalization of lithium-ion batteries based on leakage current[J]. IEEE Transactions on Sustainable Energy, 2019, 10(1): 170-180. [6] Shang Yunlong, Zhang Qi, Cui Naxin, et al.An optimized mesh-structured switched-capacitor equalizer for lithium-ion battery strings[J]. IEEE Transactions on Transportation Electrification, 2019, 5(1): 252-261. [7] Shang Yunlong, Zhang Chenghui, Cui Naxin, et al.A delta-structured switched-capacitor equalizer for series-connected battery strings[J]. IEEE Transactions on Power Electronics, 2019, 34(1): 452-461. [8] 李泉, 周云山, 王建德, 等. 基于双层准谐振开关电容的锂离子电池组均衡方法[J]. 电工技术学报, 2017, 32(21): 9-15. Li Quan, Zhou Yunshan, Wang Jiande, 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] Zhang Huakai, Wang Yongfu, Qi Han, et al.Active battery equalization method based on redundant battery for electric vehicles[J]. IEEE Transactions on Vehicular Technology, 2019, 68(8): 7531-7543. [10] 李小龙, 徐顺刚, 许建平, 等. 一种单电感双向电池均衡电路[J]. 电机与控制学报, 2019, 23(4): 90-97. Li Xiaolong, Xu Shungang, Xu Jianping, et al.Signal-inductor bidirectional battery equalizer[J]. Electric Machines and Control, 2019, 23(4): 90-97. [11] Ma Yan, Duan Peng, Sun Yanshuai, et al.Equalization of lithium-ion battery pack based on fuzzy logic control in electric vehicle[J]. IEEE Transactions on Industrial Electronics, 2018, 65(8): 6762-6771. [12] Shang Yunlong, Cui Naxin, Zhang Chenghui.An optimized any-cell-to-any-cell equalizer based on coupled half-bridge converters for series-connected battery strings[J]. IEEE Transactions on Power Electronics, 2019, 34(9): 8831-8841. [13] Yu Keke, Shang Yunlong, Wang Xiaoqian, et al.A multi-cell-to-multi-cell equalizer for series-connected batteries based on flyback conversion[C]//IEEE 2019 3rd Conference on Vehicle Control and Intelligence, Hefei, China, 2019: 21-22. [14] Chen Yang, Liu Xiaofang, Cui Yangyi, et al.A multiwinding transformer cell-to-cell active equalization method for lithium-ion batteries with reduced number of driving circuits[J]. IEEE Transactions on Power Electronics, 2016, 31(7): 4916-4929. [15] 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, 33(14): 3213-3221. Liu Qianyi, Xu Shungang, Xu Jianping, et al.A modularized equalizer for series-connected batteries based on push-pull converter[J]. Transactions of China Electrotechnical Society, 2018, 33(14): 3213-3221. [16] 刘征宇, 严鹏, 武银行, 等. 基于任意单体间能量转移的高效均衡策略[J]. 电工技术学报, 2019, 34(21): 4572-4579. Liu Zhengyu, Yan Peng, Wu Yinhang, et al.An efficient equilibrium strategy based on the energy transfer among arbitrary cells[J]. Transactions of China Electrotechnical Society, 2019, 34(21): 4572-4579. [17] 刘红锐, 李博, 郭奕旋, 等. 一种基于Sepic-Zata混合斩波电路的动力电池组双向双向高速均衡器研究[J]. 汽车工程, 2020, 42(3): 359-366. Liu Hongrui, Li Bo, Guo Yixuan, et al.Study on two-way high speed equalizer for traction battery pack based on Sepic-Zata hybrid chopper circuit[J]. Chinese Journal of Automotive Engineering, 2020, 42(3): 359-366. [18] 刘红锐, 杜春峰, 李博, 等. 一种基于混合斩波电路的蓄电池组高速能量均衡器的研究[J]. 电工技术学报, 2018, 33(增刊2): 472-478. Liu Hongrui, Du Chunfeng, Li Bo, et al.Research on high speed energy equalizer for battery pack based on mixed chopper circuit[J]. Transactions of China Electrotechnical Society, 2018, 33(S2): 472-478. [19] 李锐华, 李冀, 胡波, 等. 基于Buck-Boost变换器的磷酸铁锂电池串联电压均衡优化策略[J]. 电气技术, 2018, 19(3): 1-7. Li Ruihua, Li Ji, Hu Bo, et al.Voltage equalization optimization strategy for LiFePO4 series-connected battery packs based on Buck-Boost converter[J]. Electrical Engineering, 2018, 19(3): 1-7. [20] Lu Chusheng, Kang Longyun, Wang Shubiao.A novel symmetrical extensible battery balancing circuit based on inductor[C]// 2018 21st International Conference on Electrical Machines and Systems (ICEMS), Jeju, South korea, 2018: 2133-2136.
2020, Vol. 35 
