| 초록 |
In this study, a second-order equivalent circuit model is integrated with energy balance to calculate temperature, voltage, and state of charge. The parameters were estimated using experimental data of electric vehicle cells at various C-rate conditions. To represent the effect of temperature on the dynamic behavior of lithium-ion cells, terms for these considerations have been added to the basic form of the parameters of the equivalent circuit model. In addition, since the actual capacity varies a lot depending on the size of the current, a strategy to deal with it was developed and applied. Since the parameter values retrieved from the preliminary investigation are for small-capacity cells, the reference parameter search ranges for estimation were obtained through a dimensionless scale-up method. As a result of the parameter estimation, in the case of voltage and temperature, the error was confirmed very small. This work was supported by the Nation Research Foundation of Korea(NRF) grant funded by the Korea government(MSIT)(NRF-2021R1C1C100421711), and by Hyundai Motor Company as Development of Battery Thermal Model considering Battery Aging for Integrated Thermal Management. |
