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  <doc>
    <id>2429</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
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    <language>eng</language>
    <pageFirst>24994</pageFirst>
    <pageLast>25001</pageLast>
    <pageNumber>8</pageNumber>
    <edition/>
    <issue/>
    <volume>9</volume>
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    <title language="eng">Reducing Cell to Cell Variation of Lithium-Ion Battery Packs During Operation</title>
    <identifier type="doi">10.1109/ACCESS.2021.3057125</identifier>
    <enrichment key="opus.import.data">@articleZiegler.2021, author = Ziegler, Andreas and Oeser, David and Hein, Thiemo and Montesinos Miracle, Daniel and Ackva, Ansgar, year = 2021, title = Reducing Cell to Cell Variation of Lithium-Ion Battery Packs During Operation, pages = 24994–25001, pagination = page, volume = 9, journaltitle = IEEE Access, doi = 10.1109/ACCESS.2021.3057125, abstract = , file = Ziegler, Oeser et al. 2021 - Reducing Cell to Cell Variation:YAG-NESVeröffentlichungen100_TTZ-EMO-bibCitavi AttachmentsZiegler, Oeser et al. 2021 - Reducing Cell to Cell Variation.pdf:pdf</enrichment>
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    <author>Andreas Ziegler</author>
    <author>David Oeser</author>
    <author>Thiemo Hein</author>
    <author>Daniel Montesinos Miracle</author>
    <author>Ansgar Ackva</author>
    <collection role="institutes" number="ttzemo">Technologietransferzentrum Elektromobilität (TTZ-EMO)</collection>
  </doc>
  <doc>
    <id>2428</id>
    <completedYear/>
    <publishedYear>2020</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
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    <edition/>
    <issue>8</issue>
    <volume>13</volume>
    <type>article</type>
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    <belongsToBibliography>1</belongsToBibliography>
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    <title language="eng">Run to Failure: Aging of Commercial Battery Cells beyond Their End of Life</title>
    <parentTitle language="deu">Energies</parentTitle>
    <identifier type="doi">10.3390/en13081858</identifier>
    <enrichment key="opus.import.data">@articleZiegler.2020, author = Ziegler, Andreas and Oeser, David and Hein, Thiemo and Montesinos Miracle, Daniel and Ackva, Ansgar, year = 2020, title = Run to Failure: Aging of Commercial Battery Cells beyond Their End of Life, urldate = 2020-05-25, volume = 13, journaltitle = Energies, doi = 10.3390/en13081858, number = 8, abstract = , file = Ziegler, Oeser et al 2020 - Run to Failure:YAG-NESVeröffentlichungen100_TTZ-EMO-bibCitavi AttachmentsZiegler, Oeser et al 2020 - Run to Failure.pdf:pdf, note = PII: en13081858</enrichment>
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    <author>Andreas Ziegler</author>
    <author>David Oeser</author>
    <author>Thiemo Hein</author>
    <author>Daniel Montesinos Miracle</author>
    <author>Ansgar Ackva</author>
    <collection role="institutes" number="ttzemo">Technologietransferzentrum Elektromobilität (TTZ-EMO)</collection>
  </doc>
  <doc>
    <id>5758</id>
    <completedYear/>
    <publishedYear>2024</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber>10</pageNumber>
    <edition/>
    <issue/>
    <volume>101</volume>
    <type>article</type>
    <publisherName>Elsevier</publisherName>
    <publisherPlace/>
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    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
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    <title language="eng">Age-related development of cell-to-cell variation under various operating conditions in commercial NMC/graphite lithium-ion cells</title>
    <abstract language="eng">In real applications, lithium-ion cells are usually used in individual interconnections, with the worst cell determining capacity, performance and service life. Due to different ageing rates of the assembled cells, cell-to-cell variation changes over lifetime. In literature, cell-to-cell variation is usually investigated near room temperature under one operating condition. Data regarding cell-to-cell variation above and below room temperature under different operating conditions are hard to find. To fill the gap in literature, this study considers cell-to-cell variation as a function of different charge/discharge currents at ambient temperatures between 0 °C and 40 °C on commercial NMC/graphite cells (Samsung SDI ICR18650-26J). The results demonstrate that cell-to-cell variation strongly depends on the selected operating conditions. In particular, operating conditions near the lithium plating boundary at the beginning of the ageing process have a particularly high risk of developing a pronounced variation. Fast charging or charging at lower temperatures should therefore be avoided. Operation at moderate temperatures and currents, on the other hand, only leads to a slight increase in cell-to-cell variation in the tests carried out. A 24-month storage during the testing period at 30% SOC and room temperature of the same cells shows even a slight reduction in cell-to-cell variation.</abstract>
    <parentTitle language="eng">Journal of Energy Storage</parentTitle>
    <identifier type="doi">10.1016/j.est.2024.113787</identifier>
    <identifier type="urn">urn:nbn:de:bvb:863-opus-57585</identifier>
    <enrichment key="opus.doi.autoCreate">false</enrichment>
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    <licence>Creative Commons - CC BY - Namensnennung 4.0 International</licence>
    <author>David Oeser</author>
    <author>Thiemo Hein</author>
    <author>Andreas Ziegler</author>
    <author>Michael Seefried</author>
    <author>Sebastian Gielinger</author>
    <author>Daniel Montesinos-Miracle</author>
    <author>Gunther Bohn</author>
    <author>Ansgar Ackva</author>
    <collection role="institutes" number="ttzemo">Technologietransferzentrum Elektromobilität (TTZ-EMO)</collection>
    <collection role="oa-colour" number="">Gefördert (Hybrid/DEAL)</collection>
    <file>https://opus4.kobv.de/opus4-fhws/files/5758/Oeser_Age-related_development_cell-to-cell.pdf</file>
  </doc>
  <doc>
    <id>5397</id>
    <completedYear/>
    <publishedYear>2023</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue>3</issue>
    <volume>9</volume>
    <type>article</type>
    <publisherName/>
    <publisherPlace/>
    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Aging Determination of Series-Connected Lithium-Ion Cells Independent of Module Design</title>
    <abstract language="eng">In this work, a battery consisting of eight commercial NMC/graphite cells connected in series was cycled to 60% of its initial capacity. During the test, special care was taken to ensure that the results were not influenced by either the module assembly or the module design. For this purpose, the cells were virtually connected in a laboratory environment with the help of the test device as if they were operated together in a battery. Extrinsic influences that affect cell aging were thus reduced to a minimum. Differential Voltage Analysis (DVA), Electrochemical Impedance Spectrum (EIS), and relaxation measurements were performed to analyze the aging behavior of each cell. The results show that despite a theoretically perfect module design, Cell-to-Cell Variations (CtCV) occurred during aging. The shifting Depth of Discharge (DoD) values among the cells further amplify CtCV. Lithium plating was also observed in the faster aging cells after cyclic aging, suggesting that this aging effect contributes significantly to the development of CtCV. After the aging test, the battery was equipped with an active balancing system that maximizes capacity utilization. More important, the balancing charges which are calculated iteratively within the used balancing algorithm show a strong correlation to the pure capacity losses and thus provide a new way to determine the capacity values of each cell individually without disassembling the battery.</abstract>
    <parentTitle language="eng">Batteries</parentTitle>
    <identifier type="doi">10.3390/batteries9030172</identifier>
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    <enrichment key="opus.urn.autoCreate">true</enrichment>
    <author>Thiemo Hein</author>
    <author>David Oeser</author>
    <author>Andreas Ziegler</author>
    <author>Daniel Montesinos-Miracle</author>
    <author>Ansgar Ackva</author>
    <collection role="institutes" number="fe">Fakultät Elektrotechnik</collection>
  </doc>
  <doc>
    <id>2287</id>
    <completedYear/>
    <publishedYear>2021</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst/>
    <pageLast/>
    <pageNumber/>
    <edition/>
    <issue/>
    <volume>191</volume>
    <type>article</type>
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    <creatingCorporation/>
    <contributingCorporation/>
    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
    <publishedDate>--</publishedDate>
    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">A capacity-based equalization method for aged lithium-ion batteries in electric vehicles</title>
    <parentTitle language="deu">Electric power systems research</parentTitle>
    <identifier type="issn">0378-7796</identifier>
    <identifier type="doi">10.1016/j.epsr.2020.106898</identifier>
    <enrichment key="opus.import.data">@articleHein.2021, author = Hein, Thiemo and Ziegler, Andreas and Oeser, David and Ackva, Ansgar, year = 2021, title = A capacity-based equalization method for aged lithium-ion batteries in electric vehicles, volume = 191, issn = 03787796, journaltitle = Electric Power Systems Research, doi = 10.1016/j.epsr.2020.106898, abstract = , file = Hein, Ziegler et al 2021 - A capacity-based equalization method:YAG-NESVeröffentlichungen100_TTZ-EMO-bibCitavi AttachmentsHein, Ziegler et al 2021 - A capacity-based equalization method.pdf:pdf, note = PII: S0378779620306969</enrichment>
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    <author>Thiemo Hein</author>
    <author>Andreas Ziegler</author>
    <author>David Oeser</author>
    <author>Ansgar Ackva</author>
    <collection role="institutes" number="ttzemo">Technologietransferzentrum Elektromobilität (TTZ-EMO)</collection>
  </doc>
  <doc>
    <id>2427</id>
    <completedYear/>
    <publishedYear>2019</publishedYear>
    <thesisYearAccepted/>
    <language>eng</language>
    <pageFirst>1</pageFirst>
    <pageLast>6</pageLast>
    <pageNumber>6</pageNumber>
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    <belongsToBibliography>1</belongsToBibliography>
    <completedDate>--</completedDate>
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    <thesisDateAccepted>--</thesisDateAccepted>
    <title language="eng">Development and Application of an Active Balancing System for Lithium-Ion Cells</title>
    <parentTitle language="eng">2019 IEEE Vehicle Power and Propulsion Conference (VPPC)</parentTitle>
    <identifier type="isbn">978-1-7281-1249-7</identifier>
    <identifier type="doi">10.1109/VPPC46532.2019.8952317</identifier>
    <enrichment key="opus.import.data">@inproceedingsZiegler.2019b, author = Ziegler, Andreas and Oeser, David and Hein, Thiemo and Ackva, Ansgar, title = Development and Application of an Active Balancing System for Lithium-Ion Cells, pages = 1–6, bookpagination = page, publisher = IEEE, isbn = 978-1-7281-1249-7, booktitle = 2019 IEEE Vehicle Power and Propulsion Conference (VPPC), year = 2019, abstract = , doi = 10.1109/VPPC46532.2019.8952317, file = https://ieeexplore.ieee.org/xpl/mostRecentIssue.jsp?punumber=8945128, file = Ziegler, Oeser et al 2019 - Development and Application:YAG-NESVeröffentlichungen100_TTZ-EMO-bibCitavi AttachmentsZiegler, Oeser et al 2019 - Development and Application.pdf:pdf, booksubtitle = Proceedings : 14-17 October 2019, Hanoi, Vietnam, location = Piscataway, NJ, eventtitle = 2019 IEEE Vehicle Power and Propulsion Conference (VPPC), venue = Hanoi, Vietnam, eventdate = 10/14/2019 - 10/17/2019</enrichment>
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    <author>Andreas Ziegler</author>
    <author>David Oeser</author>
    <author>Thiemo Hein</author>
    <author>Ansgar Ackva</author>
    <collection role="institutes" number="ttzemo">Technologietransferzentrum Elektromobilität (TTZ-EMO)</collection>
  </doc>
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