Research Information System
15th International Conference on Computational Heat and Mass Transfer, ICCHMT 2025, Antalya, Turkey, 19 - 22 May 2025, vol.29, pp.413-422, (Full Text)
Lithium-ion (Li-ion) batteries have a crucial role in power demanding applications along with the energy storage systems due to their prominent specifications such as high energy density, long cycle life, and low self-discharge rate. The Open Circuit Voltage (OCV) is defined as the potential difference between the battery electrodes when there is no applied current and has a significant role while estimating the battery's State of Charge (SoC) or even to predict the produced heat during the charge and discharge processes in simulations. Therefore, this study focuses on determining the OCV values of a cylindrical Li-ion cell at various SoC values and operating temperatures. In addition, apart from the other studies, the SoC range is extended up to −10% to be able to predict a possible over-discharge behavior of the cell. The measurements were performed under 280 K, 300 K, and 323 K to investigate the effects of the ambient temperature on the OCV measurements at each SoC value. The results showed that the OCV values of the battery were significantly impacted by the operating temperature and the over-discharging process, especially at high temperatures and low SoC values. The OCV values obtained at 280 K and 300 K ambient temperatures also contributed to the determination of the entropic term, which will be useful to model the reversible heat generation behavior of the battery under both standard and over-discharging conditions.