Abstract:
This study aims to determine the heat generated during the charging and discharging of lithium-ion batteries using water as a medium for heat exchange and to compare this with the heat measurement method using a Thermostatic chamber. The experiment was conducted with an initial water temperature of 28°C, using two types of lithium-ion batteries, Vapcell F35 18650 and INR 18650-320, at charging and discharging rates of 0.5C, 1C, and 1.5C. The results revealed that the temperature within the system continuously increased in accordance with the charging and discharging rates, both when using water and the Thermostatic chamber. The Vapcell F35 18650 battery released more heat than the INR 18650-320 at low charging and discharging rates, while at a discharge rate of 1C, the INR 18650-320 released more heat. Additionally, the heat generated by the water pump in the system remained low and almost unchanged across all charging and discharging rates. A comparison between the two experimental methods showed that the heat values were similar. Water as a medium demonstrated higher efficiency in heat transfer in an environment with continuous water flow, while the Thermostatic chamber provided accurate heat measurements but was less effective in simulating heat transfer compared to water.