Modelling of battery temperature effect on electrical characteristics of Li-ion battery in hybrid electric vehicle

This paper presents an enhanced modelling method for the commonly used energy storage device i.e. lithium-ion (Li-ion) battery of a hybrid electrical vehicle (HEV). In this enhanced modelling method, the thermal effect, an important part of the battery electrical model, is considered to generate a holistic understanding, hence the characteristic of the Li-ion battery. Because of the high temperature sensitivity of the battery cell/pack in HEV, it is critical to have such accurate thermal-electrical model. Compared with sole electrical model of Li-ion battery, the simulation results from MATLAB Simulink modelling show that the combination of thermal and electrical models by making use of a thermal function to model the differences made by temperature exhibit better representations of the actual characteristic of the Li-ion battery.