An evaluation of surface temperature distribution under different charging and discharging modes of the lithium-ion phosphate battery using Thermal Imaging

Abstract

This study aims to determine the thermal behavior of lithium-ion phosphate (LiFePO4) 20Ah battery by Thermal imaging. This study focuses on day/night charging and discharging to the battery's temperature distribution. The thermal gradient of battery, LiFePO4 powered bike at different speeds 30kmph, 40kmph, 50kmph both load and without load condition. The spatial distribution of LiFePO4 cells was not stable during the discharging process. No significant temperature rise was recorded at the end of the discharge. During the range test at 30kmph, 40kmph, and 50kmph, the maximum surface temperature reached 47.90℃, 44.20℃, and 46.70 ℃, respectively. The battery's front view was most of the highest surface temperature region. The result shows thermal imaging is an effective tool to predict the temperature behavior of batteries and provide a better thermal management system in battery development