摘要
锂离子电池的交流阻抗能够反映电池内部信息,是电池状态在线监测的有力工具。阻抗在线测量装置的设计是实现基于阻抗的电池状态在线估计及故障预警技术的关键。本文基于嵌入式微控制器设计了锂离子电池交流阻抗在线测量装置,采用全相位快速傅里叶变换算法将时域数据转换到频域,并对转换结果进行插值运算,实现了0.01 Hz~10 kHz频率范围内交流阻抗的在线测量,有效解决了当前阻抗在线测量装置基于传统快速傅里叶变换算法所产生的频谱泄露、栅栏效应以及相位计算不准确的问题。通过对不同容量、不同正极材料的电池进行静态和动态阻抗测量,验证了装置的可靠性与快速性,并且放电末期动态阻抗急剧变化特征对电池的状态具有一定的指示能力。本文设计可方便集成于电池管理系统中,在锂离子电池状态在线估计及故障预警等方面具有一定的应用价值。
The AC impedance of a lithium-ion battery can provide internal information of the battery and is a powerful tool for online monitoring of battery state.The design of an impedance online measurement device is the key to implementing impedance-based online estimation of battery state and fault warning technology.This study designed an online measurement device for AC impedance of lithium-ion batteries based on an embedded microcontroller.It uses an all-phase fast Fourier transform algorithm to convert time-domain data to the frequency domain,and performs interpolation on the conversion results,achieving online measurement of AC impedance in the frequency range of 0.01 Hz to 10 kHz.This effectively solves the problems of spectrum leakage,fence effect,and inaccurate phase calculation caused by the traditional fast Fourier transform algorithm used in current impedance online measurement devices.By performing static and dynamic impedance measurements on batteries with different capacities and positive electrode materials,the reliability and speed of the device were verified.The sharp change in dynamic impedance at the end of discharge was found to have certain indicative ability for battery state.This design can be easily integrated into a battery management system and has certain application value in lithium-ion battery state esti-mation and fault warning.
作者
杨浩
张闯
刘素贞
徐志成
陈占群
YANG Hao;ZHANG Chuang;LIU Suzhen;XU Zhicheng;CHEN Zhanqun(State Key Laboratory of Reliability and Intelligence of Electrical Equipment(Hebei University of Technology),Tianjin 300130,China;Baoding Unite Electric Co.,Ltd.,Baoding 071051,China)
出处
《电工电能新技术》
CSCD
北大核心
2024年第1期61-71,共11页
Advanced Technology of Electrical Engineering and Energy
基金
国家自然科学基金项目(51977058)
河北省中央引导地方科技发展专项(216Z4406G)。
关键词
阻抗在线测量
故障预警
全相位快速傅里叶变换
频谱泄露
栅栏效应
on-line measurement of impedance
fault warning
all-phase fast Fourier transform
spectrum leak-age
the fence effect
