Lateef Taiwo, Biju Shrestha (PhD Candidate), P. Novak (PhD Candidate), and David Wetz, Ph.D

1. Preliminary Study of Lithium-Ion Battery Pulsed Power Lateef Taiwo, Biju Shrestha (PhD Candidate), P. Novak (PhD Candidate), and David Wetz, Ph.D Department of Electrical Engineering, The University of Texas at Arlington, Arlington, Texas 76019 Experimental Setup Pulsed Charging • Summary • Study the feasibility of using lithium ion battery for powering the pulsed load • Custom stand is built to match the load profile of pulsed load which can handle the current up to 10kA and a switching frequency up to 10kHz • LabVIEW is extensively used to record the data Abstract Electrochemical energy storage devices have been developed and used widely to power portable applications. Lithium-ion batteries are extremely popular for use in portable devices as a result of their high energy density. Lithium ion batteries are being investigated for pulsed power applications. • Pulsed charging of an electrochemical cell is performed by supplying a high current in a PWM (pulsed width modulated) fashion with 15-s-long and 325-A pulsed currents were fed into the cell with a 30-s delay between pulses • Pulsed charging is performed to recharge the battery quickly • The effect of the ageing on the electrochemical cell due to pulsed charging is being studied • Commercial cycler from MACCOR is used to perform a pulsed charging CAD Drawing of Stand [2] Pulsed power technology is use to accumulate energy over a relatively long period of time and releasing it very quickly, thus increasing the instantaneous power. Pulsed power technologies in general, are characterized by the concentration of energy, both in time and space, to pulses of high intensity. However, this presentation will focus on pulsed power applications, pulse charging and discharging of lithium-ion battery, and using LabVIEW software tools to monitor and record data. • Introduction References [1] Wetz, D.A.; Shrestha, B.; Novak, P.M., "Elevated Rate Cycling of High-Power Electrochemical Energy Storage Devices for Use as the Prime Power Source of an EM Launcher," Plasma Science, IEEE Transactions on , vol.41, no.5, pp.1319,1325, May 2013[2] Shrestha, B.; Wetz, D.A.; Novak, P.M., "Pulsed Elevated Rate Discharge of Electrochemical Energy Storage Devices," Plasma Science, IEEE Transactions on, vol.40, no.10, pp.2462,2469, Oct. 2012 Current and voltage recorded during the elevated pulsed recharge of an 18-Ah GAIA LIB [1] Experimental Stand and Data Acquisition System • Pulsed Power Applications Pulsed Discharging LabVIEW Software • Pulsed discharge of an electrochemical cell is performed by discharging the cell at high current rate up to 1.1kA in a PWM fashion. • Pulsed discharge is performed to mimic the behavior at which the pulsed power device consumes energy • The effect of the ageing on the electrochemical cell due to pulsed discharging is being studied • Custom built stand is used to perform pulsed discharge • Compact Marx Generators • LabVIEW is a graphical programming platform that helps engineers scale from design to test and from small to large systems. • It is used to generate different types of pulsed load profile by controlling the switches of the custom built stand. • It is used for recording a data like voltage, current, and temperature during pulsed discharge and pulsed charging. • Sample interface is shown in which the pulse width, sampling rate, duty cycle, and discharge time. • It is an electric circuit that generates a high-voltage pulse by charging a number of capacitors in parallel, then suddenly connecting them in series. • Marx generators are often used to simulate the effects of lightning on power line gear and aviation equipment. Acknowledgments I thank Dr. Wetz David for giving me the opportunity to work in his lab. Also, I thank Biju Shrestha and Greg Turner for being a great mentor. Funding for this project was provided by NSF grant # EEC-1156801. • Electromagnetic Launchers Front Panel Switch Control For Further Information Please contact lat.taiwo@gmail.com. More information on this and related projects can be obtained at: https://wiki.uta.edu/display/PPELab/Home • It is useful to consider the relationship between the charging time to transfer energy from the power supply to the launcher and the launch time • EML batteries must be able to source pulsed currents at rates much higher than their continuous C rating. • Current Extracted During Pulsed Discharge [1]