2010 - 19th Annual NC State Undergraduate Research Spring Symposium

Session Time : 4/22/10 10:30 AM - 4/22/10 11:45 AM

Content Area : Electrical & Computer Engineering

Student Presenters :
Michael Steven Lim Electrical Engineering

Mentors and/or Co-Authors :
Alex Huang Electrical & Computer Engineering

Abstract Title : Increasing Li-Ion Lifetime and Performance of Rapid Charge Regimes

Abstract :
This project hopes to develop methods of enhancing rapid charge. These rapid charge schemes are especially desirable for the use in hybrid electrical vehicles, which requires less charge time and higher efficiency, without compromising battery lifetime and performance. The current CC-CV rapid charge regime is fairly slow, due to the CV cycle, and permanently degrades the battery. Pulse charge scheme requires a large pulse of current (~10C) to be sent to the battery, followed by a rest or discharge period. The rest or discharge period allows the lithium ions to diffuse and avoid electrolyte saturation, which helps the batteries get more capacity and less damage from rapid charging. An alternative to the rest period is a discharge period, this should cause the ionization of the leads to reverse and decrease the damage to both anode and cathode. These rapid charge schemes will be compared to constant current rapid charge and standard charge schemes, using constant current discharge, constant power discharge, hybrid pulse power, and fast charge tests.