Study of the State of Charge for Lithium-Ion Batteries Based on Real-time Electrochemical Impedance Spectroscopy

G. B. Zhong, C. Cheng, K. Q. Xu, D. Chen, J. Y. Xiang

2018

Abstract

The state of charge (SOC) prediction of Li-ion batteries is always a tough topic. Many methods such as current integration, open circuit voltage etc have been widely used in industry. The dynamic impedance |Z| and the phase angle θ, what contain not only the internal resistance but also the electrochemical and concentration polarization if perturbation frequencies are appropriate. In this paper, the 10Ah lithium-ion phosphate (LiFePO4) battery was used for the real-time electrochemical impedance spectroscopy (EIS) research without statics during charge/discharge. EIS analysis results indicated that the θ and |Z| have a strong relevance with SOC especially at the frequencies of 0.025Hz and 1Hz when charging and discharging, respectively. This provides a technical reference for SOC prediction of Li-ion batteries.

Paper Citation

in Harvard Style

Zhong G., Cheng C., Xu K., Chen D. and Xiang J. (2018). Study of the State of Charge for Lithium-Ion Batteries Based on Real-time Electrochemical Impedance Spectroscopy.In Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE, ISBN 978-989-758-346-9, pages 598-603. DOI: 10.5220/0007442005980603

in Bibtex Style

@conference{iwmce18,
author={G. B. Zhong and C. Cheng and K. Q. Xu and D. Chen and J. Y. Xiang},
title={Study of the State of Charge for Lithium-Ion Batteries Based on Real-time Electrochemical Impedance Spectroscopy},
booktitle={Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,},
year={2018},
pages={598-603},
publisher={SciTePress},
organization={INSTICC},
doi={10.5220/0007442005980603},
isbn={978-989-758-346-9},
}

in EndNote Style

TY - CONF

JO - Proceedings of the International Workshop on Materials, Chemistry and Engineering - Volume 1: IWMCE,
TI - Study of the State of Charge for Lithium-Ion Batteries Based on Real-time Electrochemical Impedance Spectroscopy
SN - 978-989-758-346-9
AU - Zhong G.
AU - Cheng C.
AU - Xu K.
AU - Chen D.
AU - Xiang J.
PY - 2018
SP - 598
EP - 603
DO - 10.5220/0007442005980603