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URN	etd-0708107-185935
Author	Yi-Ping Chen
Author's Email Address	m943010108@student.nsysu.edu.tw
Statistics	This thesis had been viewed 5577 times. Download 9670 times.
Department	Electrical Engineering
Year	2006
Semester	2
Degree	Master
Type of Document
Language	zh-TW.Big5 Chinese
Title	State-of-Charge Estimations for Lead-Acid and Lithium-Ion Batteries
Date of Defense	2007-06-15
Page Count	57
Keyword	lithium-ion battery Coulomb/Ampere-Hour Counting method dynamic open-circuit-voltage method State-of-Charge (SOC) lead-acid battery
Abstract	This thesis studies State-of-Charge (SOC) method for widely used lead-acid batteries and the most prospective lithium-ion batteries. First, the relationship between the battery capacity and the open-circuit-voltage under different charging/discharging currents is investigated based on the equivalent circuit. Experimental results indicate that the open-circuit-voltage of the lead-acid battery varies regularly with the charging/discharging current and the duration of time for the battery disconnected from the load. Accordingly, a dynamic open-circuit-voltage method in considerations the open-circuit-time and the previous operating current is capable of precisely estimating the battery capacity in a shorter time. As for the lithium-ion batteries, their charging/discharging characteristics reveal that the Coulomb/Ampere-Hour Counting method is capable of yielding accurate estimations. Finally, through the experiments that emulate practical operations, the SOC estimations of batteries are verified to demonstrate the effectiveness and accuracy of the proposed methods.
Advisory Committee	Chih-Chiang Hua - chair Jia-You Lee - co-chair Yao-Ching Hsieh - co-chair Huang-Jen Chiu - co-chair Chin-Sien Moo - advisor
Files	etd-0708107-185935.pdf indicate in-campus access immediately and off_campus access in a year
Date of Submission	2007-07-08

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