• 论文 •

### 锂离子电池SOC及容量的多尺度联合估计

1. 1. 北京航空航天大学 交通科学与工程学院, 北京 100083;
2. 北京林业大学 工学院, 北京 100083
• 收稿日期:2019-09-09 发布日期:2020-08-27
• 通讯作者: 杨世春 E-mail:yangshichun@buaa.edu.cn
• 作者简介:杨世春 男,博士,教授,博士生导师。主要研究方向:新能源汽车能源动力系统高效安全控制等。
华旸 男,博士研究生。主要研究方向:新能源汽车控制系统。
顾启蒙 男,硕士研究生。主要研究方向:新能源汽车电池管理及状态估计。
闫啸宇 男,博士研究生。主要研究方向:新能源汽车工程。
李琳 女,硕士研究生。主要研究方向:新能源汽车电池状态估计。
• 基金资助:
国家重点研发计划（2017YFB0102100）

### Multi-scale joint estimation of SOC and capacity of lithium-ion battery

YANG Shichun1, HUA Yang1, GU Qimeng1, YAN Xiaoyu1, LI Lin2

1. 1. School of Transportation Science and Engineering, Beihang University, Beijing 100083, China;
2. School of Technology, Beijing Forestry University, Beijing 100083, China
• Received:2019-09-09 Published:2020-08-27
• Supported by:
National Key R & D Program of China (2017YFB0102100)

Abstract: The State of Charge (SOC) and battery capacity estimation of lithium-ion battery are the core of battery management system. Because the parameters of SOC and capacity affect each other in the estimation process, a multi-scale joint estimation method for SOC and capacity of ternary lithium-ion battery is proposed. In this paper, we use the equivalent circuit model of Thevenin to establish the mathematical model and state space equation. In order to solve the problem of different characteristics of battery at different temperatures, model parameters identification was carried out at different temperatures, and the two-dimensional pulse spectrograms of parameters related to SOC and temperature were established. Based on the Dual Extended Kalman Filter (DEKF), a multi-scale joint estimation model of battery state is established. The SOC and polarization voltage of the battery are estimated on the micro-time scale, the capacity of the battery is estimated on the macro-time scale, and the capacity of the SOC estimation is updated to ensure the accuracy of battery long-term estimation. Finally, the proposed multi-scale joint estimation algorithm for ternary lithium-ion battery is validated in a wide temperature range, and the result shows that it has high accuracy.