摘要
对电池的负载电流和响应电压信号进行小波变换,提出不需要从外部对电池进行特定激励,而是直接利用电池电路开关瞬间的放电电流和电压信号,运用小波变换的方法直接得到电池的阻抗信息的思路。在此基础上,对比分析了基于小波变换得到的电池交流阻抗谱和基于电化学工作站所测量的电化学阻抗谱。通过改变温度和电池荷电状态,研究了两种方法所测量阻抗的异同,并对差异来源进行了分析,为车用锂离子电池阻抗信息的在线测量提供了基础。
The impedance of a lithium - ion battery facilitates the estimation of the battery state. In this paper, the load current and the response voltage signal of the battery were measured. And then the battery impedance was obtained without the external excitation based on the wavelet transformation. In the paper, the electrochemical impedance spectra of the battery based on the wavelet transformation and the electrochemical impedance spectroscopy measured by the electrochemical workstation were compared. And the similarities and differences of the impedance measured by the two methods were studied by changing the temperature and the state of charge of the battery, the difference and the reason were analyzed. The paper provides the basis for the online measurement of the impedance of the lithium - ion battery.
出处
《佳木斯大学学报（自然科学版）》
CAS
2018年第1期144-148,共5页
Journal of Jiamusi University：Natural Science Edition
基金
国家自然科学基金项目资助(51576142)
关键词
锂离子电池
电化学阻抗谱
阻抗测量
小波变换
Lithium ion battery
Electrochemical impedance spectroscopy
Impedance measurement
Wavelet transfor
