Abstract
Thermal behavior and model are important items should be considered when designing a battery pack. A Lithium-ion battery thermal behavior and model is investigated in this paper. Battery heat generating and conducting behavior are studied. The temperature of the battery is measured when charging and discharging experiments in various profiles.
Lithium-ion (LiFePO4) batteries are put into oils that in an insulated container. Many battery experiments have carried out in National Engineering Laboratory in Shanghai Jiao Tong University. Charge and discharge the battery with equipment in various styles including constant current charge, constant current discharge, pulse current charge/discharge, and simulation styles in EV and HEV. Temperatures of the battery surface and electrode are measured.
The lithium-ion battery temperature in various charge/discharge profiles are presented as a function of time. The thermal modeling is studied and compared with experiments. The results show that the battery thermal behavior is relevant with battery internal resistance, current, time and initial temperature.
KEYWORDS – Lithium-ion battery; electric vehicle (EV); Hybrid electric vehicle (HEV); Thermal behavior; Thermal model