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2012 - 11th Annual NC State Summer Undergraduate Research Symposium
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Session Time :
8/1/12 1:30 PM - 8/1/12 2:45 PM
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Content Area : NSF FREEDM Systems Center
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Lead Student Presenters : Lumumba Harnett
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Co-Presenters :
Kenji Jamel
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Co-Presenters :
Lukas Kirchner
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Abstract Title : The Current State of Battery Management Systems
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Abstract :
Currently, the best mass produced battery in terms of energy density are Li-ion batteries. However, the problem with Li-ion batteries is that they have a very low tolerance to the amount of current each cell receives making them vulnerable to overcharging and over discharging. If either of these things happens, the cells will be damaged leading to decreased lifetime and efficiency of the battery pack. Due to battery manufacturing and environmental variables the current charging design does a poor job of evenly charging all cells in the battery pack. The goal is to design a passive battery management system which bypasses the current from cells that are charging faster than others in order to get an evenly charging system. This is made possible by hooking each cell to a microcontroller that will detect the state of charge for each cell and determine when to bypass the current. In order to do this, it was necessary to become familiar with programming the microcontroller in the system and the various functions required including interrupts, initializations, and analog to digital conversion. The result of this is a battery management system that regulates voltage, protects from overcharging, and fully and evenly charges each cell in the battery pack. The positive benefits of a consistent charge cycle leads to faster recharge time, longer lifetime, and increased efficiency of the battery pack.
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Mentor and/or Co-Author : Srdjan Miodrag Lukic
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