| Title |
Analysis of Change in Battery Parameters according to Ambient Temperature and C-rate |
| Authors |
Hyeong-Wook Park ; Jae-Hyung Lee ; Yeon-Ho Choi ; Sung-Jae Son ; Jae-Jung Yun |
| DOI |
http://doi.org/10.5207/JIEIE.2022.36.12.024 |
| Keywords |
Battery model; Battery parameter; BMS(Battery Management System); Li-ion battery |
| Abstract |
Battery parameters are used as important indicators for estimating SOC, SOH, state, etc., and their impedance changes according to the ambient temperature, C-rate, and SOC. In practice, Li-ion batteries operate in various environments where various factors are combined. Therefore, in order to obtain more accurate information on changes in battery parameters in an actual operating environment, it is necessary to conduct experiments and analyzes on battery parameters in an operating condition in which several factors overlap. In this paper, 9 operating environments were combined with 3C-rates (0.5C-rate, 1C-rate, 2C-rate) and 3 temperature conditions(0°C, 25°C, 45°C). The battery parameters are extracted from each operating environment and analyzed using a three-dimensional graph. As a result of the experiment, as the C-rate increases, all battery parameters decreases. In addition, as the environment temperature increases, the internal resistance(Ri) and the diffusion resistance(Rd) decrease, but the diffusion capacitor(Cd) increases. The parameters most affected by the ambient temperature and C-rate are Cd and Rd, respectively. Compared to other parameters, Ri is hardly changed by C-rate and is less affected by the ambient temperature compared to other parameters. Lastly, in this paper, the effect of C-rate and ambient temperature on battery parameters is analyzed for each 10% SOC section. |