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汽车安全与节能学报

JASE ›› 2017, Vol. 08 ›› Issue (02): 178-182.DOI: 10.3969/j.issn.1674-8484.2017.02.010

• 汽车节能与环保 • 上一篇    下一篇

基于安时法的锂离子电池 SOC 估计实时校正方法

刘雄飞1 ，崔彬1 ，刘俊杰1 ，林勇2   

  1. 1. 中南大学 物理与电子学院，长沙 410012，中国； 2. 湖南金杯新能源发展有限公司，长沙 410000，中国
  • 收稿日期:2017-01-10 出版日期:2017-06-25 发布日期:2017-07-04
  • 作者简介:第一作者 / First author ：刘雄飞 (1960—)，男 ( 汉 )，湖南，教授。E-mail: x.f.liu@163.com。 第二作者 / Second author ：崔彬 (1990—)，女 ( 汉 )，安徽，硕士研究生。E-mail: 352433540@qq.com。
  • 基金资助:

    国家自然科学基金资助项目 (61490702)。

On-line correction method for SOC of Li-ion battery based on current integration method

LIU Xiongfei1 , CUI Bin1 , LIU Junjie1 , LIN Yong2   

  1. 1. School of Physics and Electronics, Central South University, Changsha Hunan, 410083, China; 2. Hunan Gold Cup Energy Development Co., Ltd, Changsha Hunan, 410000, China
  • Received:2017-01-10 Online:2017-06-25 Published:2017-07-04

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摘要：

为减少工业常用荷电状态 (SOC) 估计方法——安时法的累积误差，提出一种实时校正的锂离子电池 SOC 估计方法。在 0~60 ℃，放电倍率1 C、2 C、3 C 和 0.33 C 下，进行锂离子电池放电实验，测量了电压、电流、温度，建立了锂离子电池放电数据库。从该库获取上述放电温度、放电倍率范围，SOC 值为 20%、80% 时的开路电压，以此两点引入一条关于电压与SOC 的直线。以该直线上某点电压所对应 SOC 作为修正项，并引入修正因子 α，来校正安时法所得剩余电量 SOC 估计值。与实验值对比，该 SOC 估计结果的误差小于 4%，符合工业需求。

关键词: 锂离子电池, 荷电状态 (SOC) , 开路电压法, 安时法

Abstract:

 An on-line correction method was proposed for Li-ion battery to reduce the cumulative error from state of charge (SOC) estimation method witch is industrial commonly used. Li-ion battery discharging experiments were carried out with measuring the voltages, currents and temperatures at 0~60 ℃ with discharge rate of 1 C, 2 C, 3 C and 0.33 C to build a Li-ion battery discharge database. Open-circuit voltages were obtained using this database under SOC of 20% and 80% at the same arrange of discharge temperatures and discharge rates mentioned above to determine a straight line of SOC and open-circuit voltage. The SOC corresponding a voltage point on the straight line and a correction factor α were used to correct the SOC obtained by the current integration method. The results show that the error between estimation SOC and actual SOC is less than 4%, which meets industrial demand.

Key words:  Li-ion batteries, state of charge (SOC), open-circuit voltage method, current integration method