Study on the degradation characteristics of li-ion batteries under different charging and discharging current profile

Chong, Zheng Wen (2024) Study on the degradation characteristics of li-ion batteries under different charging and discharging current profile. Final Year Project, UTAR.

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Abstract

Li-ion batteries are extensively used because of their high density and longer. cycles life, which make them important for powering anything from electric. vehicles to cell phones. But over time, degradation lowers their capability and effectiveness. It is essential to understand degradation elements in order to maximise battery management and prolong battery life. Through the analysis of degradation characteristics, this research seeks to improve battery. performance and longevity, thereby improving the sustainability of energy. storage systems. In the research a real lithium-ion batteries with 15 cells are used. It also has a Battery Monitoring System which monitoring condition of the 15 cells. A Sunny Island Inverter is used to charge and discharge the batteries. The node-red software is implemented to retrieve the data from the batteries. The State of Heath (SOH) estimation is based on the Incremental Current Analysis is used to determine the SOH from the cell voltage. The SOH, degradation rate and optimal charging and discharging profiles is determine which the best profiles is around 18A to 19A which is 1kW power. This is because it has the lowest degradation rate and good SOH compared to 2kW and 1.5kW. Therefore, this research gives an insight of information in developing Li-ion battery solution. The correct charging and discharging can maximise the battery longevity and performance. In future work recommendations, a consistency charging and discharging in longer or more cycles to provide a better accuracy of the results.

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