摘要
为掌握低温下锂离子电池荷电状态(SOC)与超声检测特征量之间的关系,开展了圆柱卷绕型锂离子电池荷电状态超声检测与理论分析。设计了一种超声换能器固定装置来提高超声信号检测的稳定性和灵敏度。建立特征提取算法,提取超声信号幅值和超声飞行时间两个特征参量,获得低温环境下锂离子电池的最大可用容量。结果表明,在低温环境下,超声飞行时间特征量相较于超声信号幅值特征量能更准确地反映锂离子电池的荷电状态。该文还研究了低温对锂离子电池负极材料弹性模量、质量、长度的影响,建立了低温环境下锂离子电池荷电状态与超声透射飞行时间量化方程,量化方程与检测数据之间的拟合决定系数为0.966 8。该研究可为低温环境下锂离子电池SOC的准确检测提供参考。
To obtain the relationship between state of charge of lithium-ion battery and ultrasonic transmission features at low temperature,experiments and theory analysis on ultrasonic detection of the state of charge of cylindrically wound lithium-ion batteries were carried out.A fixing device was developed to improve the sensing stability and sensitivity.The feature extraction algorithm was proposed to extract ultrasonic signal amplitude(SA)and ultrasonic time-of-flight(TOF).The research on SOC detection by ultrasonic transmission method at low temperature was carried out.The maximum usable capacity of lithium-ion batteries was obtained.The results show that,the TOF is more accurate than the SA in state of charge detection of the lithium-ion battery at low temperature.The effects of low temperature on the elastic modulus,quality,and length of lithium-ion battery anode materials were investigated,and the quantified equations for the state of charge and ultrasonic transmission flight time of lithium-ion battery at low temperature were established.The coefficient of determination of the fitting between the quantization equation and the test data is 0.9668.This study can provide a reference for the accurate detection of lithium-ion battery SOC at low temperature.
作者
吴立峰
刘昊
林仲钦
徐策
马国明
Wu Lifeng;Liu Hao;Lin Zhongqin;Xu Ce;Ma Guoming(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University,Beijing 102206 China)
出处
《电工技术学报》
EI
CSCD
北大核心
2022年第21期5617-5626,共10页
Transactions of China Electrotechnical Society
基金
国家自然科学基金(51977075)
北京市自然科学基金(3182036)
中国科协青年人才托举工程(YESS20160004)
中央高校基本科研业务费(2019MS006)
新能源电力系统国家重点实验室(华北电力大学)自主研究课题(LAPS2020-08)资助项目。
关键词
低温
锂离子电池
荷电状态
超声透射方法
超声信号幅值
超声飞行时间
Low temperature
lithium-ion battery
state of charge
ultrasound transmission method
ultrasonic signal amplitude
ultrasonic time of flight
