High accuracy lithium-ion electric vehicle battery monitoring system

Chaw, Pui Ling (2014) High accuracy lithium-ion electric vehicle battery monitoring system. Project Report. UTeM. (Submitted)

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Abstract

Battery that widely used in electric vehicle (EV) and hybrid electric vehicle (HEV) is Lithium-ion (Li-ion) battery. This is because these battery has higher energy density and rechargeable. The objective of this project is to design a Li-ion battery monitoring system for Proton PGMC electric car. The system was designed to measure of thirteen series connected 8 V Li-ion batteries. The performance of the series batteries requires a monitoring system to measure the individual battery voltage and its charging status. Previously, there are several measurement methods had been used for series battery packs which are resistive divider, relay measurement system, localized data processing and voltage transfer circuit. Hence, voltage transfer circuit measurement system is used for this project. It must be carefully designed such that it able to withstand relatively high voltage with higher accuracy. Furthermore, the circuit is also enhanced with battery temperature measurement, and all the measuring data can be transferred to another device for further manipulation. Due to the nonlinearity voltage-charge characteristic of the LiIon battery, this monitoring system requires scanning of the individual battery voltage promptly. The result of measurement of battery voltage needed at least in range of± 1 % accuracy. This method provides a solution which is high accuracy and low cost.

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