Electrical Modelling and Emulation of High Power Lithium-ion Battery /

Abstract

A Robust demand of portable electrical and electronics devices in recent decade has led to corresponding demand of high performance batteries. Due to High energy density and less weightage, Lithium-ion Batteries have become the center of interest for electrical and electronics industries. Explicitly, electric vehicle industry where the predilection of producer is low weight, cost and high energy density, lithium batteries are preferred. An extensive research is going on in revolutionizing the most efficient power sources for EVs and in that attempt, Lithium-ion (Li-ion) batteries have come up as quite a promising option. With their high energy densities of 200-250 W.h/kg, increased tolerance to heavier loads and comparatively less charging time, Li-ion batteries provide an optimal solution for today’s EVs. With a standard battery size, it offers an average EV a drive of 250 kilometers. To maintain the efficient performance of the cell, awareness of cell states is crucial. The objective of this thesis work is to design and emulate the battery parameters while considering the dynamic and static behavior of battery. The battery parameters that will be examined in this thesis will be temperature and state of charge. Parameter estimation method will be used to simulate electric circuit model and during parameter estimation, a discharge profile will be iteratively simulated and its results compared with experimental data. Dynamics of battery will be modeled using equivalent electric circuits in Simscape and experimentally verify through tests.