Using Taguchi Method to Optimize the Combinational Parameters of Pulse Charging Factors and Temperatures for Lithium-Ion Batteries

• Main Authors: Jyun-Wei Li, 李竣煒
• Other Authors: Kuan-Jung Chung
• Format: Others
• Language: zh-TW
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/02202187140414604574

碩士 === 國立彰化師範大學 === 機電工程學系 === 103 === This study mainly focuses on developing an automatic pulse charging and discharging system. A Taguchi Method is used to estimate the effects of battery charging capacity corresponding to four parameters: temperature, pulse charging current, pulse charging frequency and pulse charging duty-cycle, and to find the optimal combinational parameters. The results show that each parameter presents different extent to affect the battery charging capacity in which the pulse charging current and temperature have obvious influence individually. In addition, the validation test of using the optimal parameters presents higher charging capacity than other parameters to demonstrate the better charging efficiency. An automatic experimental system was developed in this study. We analysis the charge-discharge cycle life using traditional Constant Current-Constant Voltage (CC-CV) method and Pulse Charging method. An Electrochemical Impedance Spectroscopy (EIS) is used to analysis the inner-resistance of battery. The result of EIS shows that the Li-ion battery of using Pulse Charging method presents lower rate on Solid Electrolyte Interface (SEI) layer increase and lower Charge-Transfer Kinetic Resistance (Rct) than using CC-CV method. It shows that Pulse Charging method can effective in slowing the speed of resistance increase, extending the life of Li-ion battery. The Capacity Fade results also show that the life of Li-ion battery of using Pulse Charging method have better lifespan, which have the same tendency with EIS analysis. Above all, Pulse Charging method is a batter charging method than the CC-CV in presenting measurement in this study.