开路电压
电压
荷电状态
材料科学
电池(电)
离子
去极化
极化(电化学)
电阻抗
电气工程
原子物理学
分析化学(期刊)
化学
物理
工程类
热力学
功率(物理)
医学
有机化学
物理化学
色谱法
内分泌学
作者
Yiduo Li,Xiaojiang Sun,Hanbo Wang,Hanqing Lu,Changying Liu
出处
期刊:Academic journal of science and technology
[Darcy & Roy Press Co. Ltd.]
日期:2023-01-04
卷期号:4 (2): 69-73
标识
DOI:10.54097/ajst.v4i2.3972
摘要
There is a serious diffusion-polarization effect in the working process of lithium-ion batteries, resulting in a large rebound of battery voltage after charge/discharge. The measurement of the open circuit voltage (OCV) of the battery was interfered by the existence of this polarization, while accuracy of battery state of charge estimating based on open circuit voltage and state of charge (SoC) curve is reduced. At the same time, measurement of AC impedance spectrum was interfered by the fluctuating voltage. In this work battery was rapidly depolarized through pulse charge-discharge in discharging procedure. Compared with the standard depolarization method by reducing the discharge rate (0.05C), the discharge test time was reduced by 72.5% and polarization effect was weakened at low SoC. There was no significant difference in results for this charging technology compared with EIS curve tested after conventional charging and reduced test time by 42%.
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