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.
Highlights
State-of-Health and State-of-ChargeLi-ion battery cells have been widely adopted for reasons such as less self-discharge, less memory effect, higher energy density per weight and volume, stable performance, and longer cycle life compared to other types of secondary batteries
Lithium-ion battery cells show different behaviors depending on degradation and charging states, and overcharge and overdischarge of cells shorten battery life and cause safety problems, 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
Summary
Li-ion battery cells have been widely adopted for reasons such as less self-discharge, less memory effect, higher energy density per weight and volume, stable performance, and longer cycle life compared to other types of secondary batteries. They are used in a variety of systems such as portable electronics [1], electric vehicles [2], spacecraft and aircraft power systems [3], renewable energy systems [4], marine current energy systems [5], stationary energy storage [6], etc. The simulation model considers cell SoC, SoH, cell temperature, and operating current
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