Performance Improvement of Lithium Polymer Battery Charger System by Using Super-Capacitor

• Main Authors: Shao-Wei Chieh, 偕少瑋
• Other Authors: Sheng-Yuan Ou
• Format: Others
• Online Access: http://ndltd.ncl.edu.tw/handle/xuu798

碩士 === 國立臺北科技大學 === 電機工程系所 === 104 === The purpose of this thesis is to design and implement a power management system for lithium polymer battery, in which the super capacitor is integrated with the used lithium polymer battery and output energy management is performed to compensate the generated voltage drop in boost DC/DC converter while operating at a high load and improve the temperature rise and output losses of lithium polymer battery to extend the battery lifetime. In this thesis, the ripple improvement is measured under various load conditions while the super capacitor is added at the output terminal. In the experiments, charge / discharge test for 400 cycles is performed to compare the performance of lithium polymer battery integrated super capacitor with conventional one. The used lithium polymer battery integrated with super capacitor can maintain the useful capacitance about 60% as charge/discharge 400 cycles, and the battery without super capacitor remains the useful capacitance below 60% as only charge/discharge 200 cycles. The experimental results verify the significant performance in case of the lithium polymer battery integrated with super capacitor.