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The defense date of the thesis is 2014-09-07
The current date is 2019-04-25
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URN etd-0907114-163725 Statistics This thesis had been viewed 968 times. Download 2 times. Author Chih-Chung Chen Author's Email Address firstname.lastname@example.org Department Electrical Engineering Year 2013 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 49 Title ESTIMATION OF THE STATE OF CHARGE FOR LI-ION BATTERY ON CHARGE STATE BY EQUIVALENT CIRCUIT MODEL Keyword Li-ion estimation of SOC charge charge estimation of SOC Li-ion Abstract For now electric devices work style are different. But most of the power sources are rechargeable Li-ion batteries. So Li-ion battery became life necessities. Therefore users must know behavior of battery. And they need to know state of charge (SOC). Then they can evaluate if the battery is able to complete the remaining work. If the remaining capacity is insufficient to use, users can replace the battery or charge immediately. That’s the purpose of this SOC estimation.
In this thesis, we use an equivalent circuit model (ECM) (a RC circuit) to represent Li-ion battery. In order to get the parameters of the ECM, we use open circuit voltage test and pulse current test to obtain the data. And the relationship of the parameters of ECM and SOC are nonlinear. Then we use first order least square to fit curve. And then, we substitute the estimated parameters into state-space equation to estimate SOC. Simulation results show the validity of the proposed method.
Advisor Committee Chung-Chun Kung - advisor
none - co-chair
none - co-chair
Files Date of Defense 2014-07-30 Date of Submission 2014-09-07