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John G. Kassakian. He, Yiou Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 2014-10-21T17:25:24Z 2014-10-21T17:25:24Z 2014 2014 http://hdl.handle.net/1721.1/91088 892652240 Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2014. 55 Cataloged from PDF version of thesis. Includes bibliographical references (pages 154-157). Battery-ultracapacitors hybrid energy storage systems (ESS) could combine the high power density and high life cycle of ultracapacitors with the high energy density of batteries, which forms a promising energy storage system. In this thesis, an assessment of the benefits of the hybrid ESS relative to its battery-only counterpart in pulse-load applications is investigated for both Nickel-Metal Hydride (NiMH) batteries and Lithium-ion (Li-ion) batteries, and under different load profiles. Specifically, the hybrid ESS in this assessment is of the simplest type - paralleling the ultracapacitors across the batteries without any power electronics interface between them. To quantify this assessment, Discharge Capacity(0) is defined as the amount of energy one can draw out of an ESS per unit charge supplied by this ESS. The metric for quantifying the benefits is energy efficiency gain, defined as the percentage increase in the discharge capability of the hybrid ESS over its battery-only counterpart. The investigation proves that the hybrid system is more beneficial over the battery-only system in terms of how much energy it can output at a specific state-of-charge level. Among the test cases covered by this thesis, the increase in the output energy of Li-ion battery systems by incorporating ultracapacitors can reach to 17% and that of Ni-MH battery systems can reach to 33%. This thesis also shows that the benefits of paralleling ultracapactors across batteries depended upon the discharge profile of the load, the battery type and the capacitance. The benefits increase quadratically with the pulse amplitude, decreases linearly with the duty cycle and inverse with the pulse period. Moreover, capacitors with higher capacitance and lower ESR yield to larger benefits. And for batteries with a higher ESR, the ultracapacitors will show more benefits than for batteries with low ESR. by Yiou He. S.M. 157 pages eng Massachusetts Institute of Technology M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission. http://dspace.mit.edu/handle/1721.1/7582 Electrical Engineering and Computer Science. The assessment of battery-ultracapacitor hybrid energy storage systems Thesis application/pdf false Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="56da57fc-fa38-4cd8-8636-2affe9b7e7d6"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>The assessment of battery-ultracapacitor hybrid energy storage systems</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2014</PublicationDate> <Authors> <Author> <DisplayName>He, Yiou</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Electrical Engineering and Computer Science.</Keyword> <Abstract>Battery-ultracapacitors hybrid energy storage systems (ESS) could combine the high power density and high life cycle of ultracapacitors with the high energy density of batteries, which forms a promising energy storage system. In this thesis, an assessment of the benefits of the hybrid ESS relative to its battery-only counterpart in pulse-load applications is investigated for both Nickel-Metal Hydride (NiMH) batteries and Lithium-ion (Li-ion) batteries, and under different load profiles. Specifically, the hybrid ESS in this assessment is of the simplest type - paralleling the ultracapacitors across the batteries without any power electronics interface between them. To quantify this assessment, Discharge Capacity(0) is defined as the amount of energy one can draw out of an ESS per unit charge supplied by this ESS. The metric for quantifying the benefits is energy efficiency gain, defined as the percentage increase in the discharge capability of the hybrid ESS over its battery-only counterpart. The investigation proves that the hybrid system is more beneficial over the battery-only system in terms of how much energy it can output at a specific state-of-charge level. Among the test cases covered by this thesis, the increase in the output energy of Li-ion battery systems by incorporating ultracapacitors can reach to 17% and that of Ni-MH battery systems can reach to 33%. This thesis also shows that the benefits of paralleling ultracapactors across batteries depended upon the discharge profile of the load, the battery type and the capacitance. The benefits increase quadratically with the pulse amplitude, decreases linearly with the duty cycle and inverse with the pulse period. Moreover, capacitors with higher capacitance and lower ESR yield to larger benefits. And for batteries with a higher ESR, the ultracapacitors will show more benefits than for batteries with low ESR.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>