Monitoring state of lithium-ion battery (LIB) is important to prevent energy storage system (ESS)-related accidents. One of the most common methods for LIB state estimation is analysis of electrochemical impedance spectroscopy (EIS). This method analyzes chemical structure of LIB by electrochemical equivalent circuit. But EIS measurement has a limit in generating input current due to limit of voltage and difficulty in sweeping the frequency of current source. In this paper, the new state estimation method of LIB by replacing the current source used in conventional EIS device with voltage source is used. Also, the new EIS analysis method with radius of curvature (ROC) is introduced. The proposed method estimates impedance for LIB with a different aging cycle and compares the result with EIS measurement result. Also, by analyzing the radius of curvature of the Nyquist plot of EIS, it can be confirmed that the aging effect can be measured equally with EIS device data and proposed method.
|Title of host publication||2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022|
|Publisher||Institute of Electrical and Electronics Engineers Inc.|
|Number of pages||4|
|Publication status||Published - 2022|
|Event||9th International Conference on Condition Monitoring and Diagnosis, CMD 2022 - Virtual, Online, Japan|
Duration: 2022 Nov 13 → 2022 Nov 18
|Name||2022 9th International Conference on Condition Monitoring and Diagnosis, CMD 2022|
|Conference||9th International Conference on Condition Monitoring and Diagnosis, CMD 2022|
|Period||22/11/13 → 22/11/18|
Bibliographical noteFunding Information:
This work was supported under the framework of the international cooperation program managed by the National Research Foundation of Korea (NRF) (No.2017K1A4A3013579) and by the NRF grant funded by the Ministry of Science, ICT & Future Planning #NRF-2020R1A2B5B03001692.
© 2022 IEEJ.
All Science Journal Classification (ASJC) codes
- Electrical and Electronic Engineering
- Safety, Risk, Reliability and Quality
- Electronic, Optical and Magnetic Materials