Abstract The Lithium-ion battery has a steep drop of the real-time voltage at the start of the discharge and a rise of the real-time voltage at end of the discharge,which makes it difficult to determining the relationship between the open circuit voltage and the real-time voltage and also causes difficulties for estimating the state of charge(SOC) accurately with conventional methods.In response to this,a new method based on energy model for estimating the SOC of the lithium-ion battery during the discharge is put forward.Firstly,the dual-source model with nonlinear controlled sources is proposed,and then the parameters of this model are identified according to the capacity characteristics of the battery.The SOC is forecasted under the condition of the constant current discharge,the variable current discharge,and the simulated working condition.The comparison of the predicted and the measured SOC proves that the method can accurately simulate the capacity characteristics of the battery and estimate its SOC.
Liu Jinzhi,Yang Peng,Li Lianbing. A Method to Estimate the Capacity of the Lithium-ion Battery Based on Energy Model[J]. Transactions of China Electrotechnical Society, 2015, 30(13): 100-107.
[1] 戴海峰,魏学哲,孙泽昌.基于等效电路的内阻自适应锂离子电池模型[J].同济大学学报(自然科学版),2010,38(1):98-102. Dai Haifeng,Wei Xuezhe,Sun Zechang.An inner resistance adaptive model based on equivalent circuit of lithium-ion batteries[J].Journal of Tongji University (natural science),2010,38(1):98-102. [2] Sun Fengchun,Hu Xiaosong,Zou Yuan,et al.Adaptive un-scented Kalman filtering for state of charge estimation of a lithium-ion battery for electric vehicles[J].Energy,2011,36(5):3531-3540. [3] Plett G L.Extended Kalman filtering for battery management systems of LiPB-based HEV battery packs Part 1 Background[J].Journal of Power Sources,2004,134(2):252-261. [4] Hu X S,Li S B,Peng H.A comparative study of Equivalent circuit models for Li-ion batteries[J].Journal of Power Sources,2012,198:359-367. [5] 陈大分,姜久春,王占国,等.动力锂离子电池分布参数等效电路模型研究[J].电工技术学报,2013,28(7):169-176. Chen Dafen,Jiang Jiuchun,Wang Zhanguo,et al.Research on distribution parameters equivalent-circuit model of power lithium-ion batteries[J].Transactions of China Electrotechnical Society,2013,28(7):169-176. [6] Kaeden E,Mauracher P,Schope F.Electrochemical modelling of lead/acid batteries under operating conditions of electricvehicles[J].Journal of Power Sources,1997,64(1):175-180. [7] 武国良,周志宇,于达仁.应用非稳态开路电压方法估计EV 用电池剩余电量研究[J].电机与控制学报,2013,17(4):110-115. Wu Guoliang,Zhou Zhiyu,Yu Daren.Unsteady open circuit voltage method for state of charge estimation of electric vehicle batteries[J].Electric Machines and Control,2013,17(4):110-115. [8] Caumont O,Le Moigne P,Rombaut C,et al.Energygauge for lead-acid batteries in electric vehicles[J].IEEE Transactions on Energy Conversion,2000,15(3):354-360. [9] 裴锋,黄向东,罗玉涛,等.电动汽车动力电池变流放电特性与荷电状态实时估计[J].中国电机工程学报.2005,25(9):164-168. Pei Feng,Huang Xiangdong,Luo Yutao,et al.Variable current discharge characteristics and SOC estimation of EV/HEV battery[J].Proceedings of the CSEE,2005,25(9):164-168. [10]于海芳,逯仁贵,朱春波,等.基于安时法的镍氢电池SOC估计误差校正[J].电工技术学报,2012,27(6):12-18. Yu Haifang,Lu Rengui,Zhu Chunbo,et al.State of Charge Estimation Calibration for Ni-MH Battery Based on Ampere-Hour Method[J].Transactions of China Electrotechnical Society,2012,27(6):12-18. [11]Aylor J H,Johnson B W.A battery state-of-charge indicator for Electric wheel chairs[J].IEEE Transactions on Industrial Electronics 1992,39:398-409. [12]李哲,卢兰光,欧阳明高.提高安时积分法估算电池SOC精度的方法比较[J].清华大学学报(自然科学版),2010,50(8):1293-1296. Li Zhe,Lu Languang,Ouyang Minggao.Comparison of methods for improving SOC estimation accuracy through an ampere-hour integeration approach[J].Journal of Tsinghua University (Science and Technology),2010,50(8):1293-1296. [13]Shen W X,Chan C C,Lo E W C,et al.Adaptive nuero-fuzzy modeling of battery residual capacity for electric vehicle[J].IEEE Transactions on Industrial Electronics,2002,49(3):677-684. [14]Shen W X,Chan C C,Lo E W C,et al.A new battery available capacity indicator for electric vehicles using neural network[J].Energy Conversion and Aagement,2002,43(6):817-826. [15]Zheng Minxin,Qi Bojin,Du Xiaowei.Dynamic model for characteristics of li-ion battery on electric vehicle[C].4th IEEE Conference on Industrial Electronics and Applications,Xi’an,2009:2867-2871. [16]国家发展与改革委员会.QC／T 743—2006电动汽车用锂离子蓄电池[S].北京:中国标准出版社,2006.
2015, Vol. 30 
