| Summary: | 碩士 === 大葉大學 === 機械與自動化工程學系 === 100 === This article discusses the characteristics of light electric vehicle and the design of the Battery Management System. Plan the battery status monitor and set up battery protective mechanisms can avoid shortened battery life which reduces the battery efficiency; furthermore, it might affect power reliability when we drive. This study used various management methods including estimate state of charge and passive battery balance circuits and battery status monitoring and protection mechanisms (prevent the battery over-voltage and over Current) and the battery pack temperature monitor and display real-time information with current. Light electric vehicles were used as a model, battery pack was formed with LiFePO4. Four single-battery was connected in a parallel circuit and four of the same parallel circuits were connected in series to stack a 48V battery pack. It used DYNO and Microcomputer discharger and charger to study the vehicle mileage show the charge and discharge curves; the main objects for this study were electric vehicles sturdiness and research the battery characteristic curve to investigate the battery management System affects the battery pack or how battery protection mechanism affects the battery charge and discharge curves efficiency.
In this study, we used IC-S-8209A to protect the battery cell and battery power balance. Used this IC can effectively reduce the size of battery management system circuit. Research methods: It used open-loop voltage to contrast with state of charge to establish data table. From the table, we can understand the characteristics of lithium-ion battery so we can establish ADC Circuit to monitor temperature and voltage and current. Select batteries with similar characteristics of lithium ion to protect IC to establish of circuit hardware; Select appropriate resistor to consume excess power. Next, use Microcomputer discharger and charger to test the battery charge and discharge curves to verify that protection mechanism of action. After all, combine battery module and battery management system, set in the DYNO experimental platform and running road resistance prove that this system can be used for light electric vehicles.
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