机电工程技术2024，Vol.53Issue(4)：297-302,6.DOI:10.3969/j.issn.1009-9492.2024-00013
退役锂电池高压放电声音信号时频特征研究
Study on Time-frequency Characteristics of High-voltage Discharge Sound Signals from Retired Lithium Batteries
摘要
Abstract
In order to achieve the cascading utilization of retired power batteries,taking the high-voltage discharge sound of 10 A·h square shell batteries as the research object.The internal ion activity,discharge capacity,charge migration andsupply capacity of different SOH batteries are connected with their discharge sound patterns,and relevant statistical indicators are extracted to represent the aging status of batteries.Collect battery discharge sound through a self built sound acquisition experimental platform,preprocess the discharge sound,and finally extract its time-domain features(time-domain graph,root mean square energy)and frequency-domain features(spectrogram)for analysis.Through time-frequency domain characteristic analysis,it is found that under the induction of a high-voltage electric field,the battery emits sound during discharge,and the high-energy discharge area of the battery is concentrated around 10 kHz.with the decrease of SOH,the ions inside the battery become inactive,and the ability of charge migration and replenishment weakens.The stability of the sound signal waveform in the time domain graph becomes worse,and the amplitude main range continuously decreases.The root mean square energy of the battery discharge sound continuously decreases,while in the spectrogram,the discharge phenomenon is weak,The discharge frequency and energy have significantly decreased.关键词
梯次利用/磷酸铁锂电池/声音信号/时频分析Key words
cascade utilization/lithium iron phosphate battery/sound signal/time-frequency analysis分类
信息技术与安全科学引用本文复制引用
姜毅恒,汪志成,周书民..退役锂电池高压放电声音信号时频特征研究[J].机电工程技术,2024,53(4):297-302,6.基金项目
江西省技术创新引导类项目(科合作专项)(20212BDH80008) （科合作专项）
东华理工大学江西省新能源工艺与装备工程术研究中心开放基金项目(JXNE·2018-04) （JXNE·2018-04）
