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Development of a Matlab/Simulink Model for Monitoring Cell State-Of-Health and State-Of-Charge via Impedance of Lithium-Ion Battery Cells
Citation key batteries8020008
Author Kim, Jonghyeon and Kowal, Julia
Year 2022
ISSN 2313-0105
DOI 10.3390/batteries8020008
Journal Batteries
Volume 8
Number 2
Abstract Lithium-ion battery cells not only show different behaviors depending on degradation and charging states, but also overcharge and overdischarge of cells shorten battery life and cause safety problems, thus studies aiming to provide an accurate state of a cell are required. Measurements of battery cell impedance are used for cell SoH and SoC estimation techniques, but it generally takes a long time for a cell in each state to be prepared and cell voltage response is measured when charging and discharging under each condition. This study introduces an electrical equivalent circuit model of lithium-ion cells developed in the MATLAB/Simulink environment. Cell SoC, SoH, temperature, and C-rate are considered for more accurate cell impedance prediction, and the simulation results are verified with the measurement results. The developed model is suitable for use in cell SoC and SoH monitoring studies by successfully outputting cell impedance through real-time prediction of cell voltage during discharge.
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