Multiple Dynamic Heat Sources Thermal Modeling of a Pouch LiFePO4 Lithium-ion Battery

Abstract

To research the temperature field of lithium-ion battery for electric vehicle during working condition, a thermal model of a pouch LiFePO4 lithium-ion battery is established to obtain more accurate and dynamic changing distribution of battery temperature field. Time varying heat sources model, coupling thermal effect of plate lug, was established based on the characteristic of heat generation in battery caused by its internal resistance. The analysis of battery heat generation character, heat transfer character, and heat dissipation character are also carried out. Three dimension temperature field of battery are analyzed, and the corresponding experiments are conducted. The experimental result indicate that, the multiple dynamic heat sources thermal model built in this research can preferably reflect the real temperature of the pouch LiFePO4 lithium-ion battery.