Influence of Switching on the Aging of High Power Lithium-Ion Cells
For intelligent battery systems that are able to control the current flow for each individual cell, the multilevel inverter is an interesting approach to replace the bidirectional AC/DC-converter and improve flexibility of charging system and signal quality in both directions. Therefore, the cells a...
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| Format: | Article |
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MDPI AG
2022-04-01
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| Series: | Batteries |
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| Online Access: | https://www.mdpi.com/2313-0105/8/4/33 |
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| author | Guy Williams Ngaleu Michael Theiler Xenia Straßer Christian Hanzl Lidiya Komsiyska Christian Endisch Meinert Lewerenz |
| author_facet | Guy Williams Ngaleu Michael Theiler Xenia Straßer Christian Hanzl Lidiya Komsiyska Christian Endisch Meinert Lewerenz |
| author_sort | Guy Williams Ngaleu |
| collection | DOAJ |
| description | For intelligent battery systems that are able to control the current flow for each individual cell, the multilevel inverter is an interesting approach to replace the bidirectional AC/DC-converter and improve flexibility of charging system and signal quality in both directions. Therefore, the cells are modulated by switching varying the duty cycle, the current and the frequency up to the kHz-range. This is only beneficial if the switching does not lead to a significant additional aging. The scientific gap to assess and understand the impact of switching is investigated in this paper by testing 22 high-power 18650 lithium-ion cells (Samsung 25R). The cells are tested at 50 Hz and 10 kHz switching frequency during charge, discharge and charge/discharge at 50% duty cycle. The tests are compared to eight reference tests with continuous current flow performed at the average and the maximum current for charge and discharge, respectively. The results are obtained by evaluating the remaining capacity, resistance, electrochemical impedance spectroscopy and dV/dQ analysis. Before reaching rollover, the investigated cells lose homogeneity and cathode capacity but no significant difference for the aging parameters are found. After rollover, the cell-to-cell variation is greater than the aging induced by the different cycling parameters. |
| first_indexed | 2024-03-09T11:09:09Z |
| format | Article |
| id | doaj.art-80eaa5c90ffb4175ae905e23da966a23 |
| institution | Directory Open Access Journal |
| issn | 2313-0105 |
| language | English |
| last_indexed | 2024-03-09T11:09:09Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
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| series | Batteries |
| spelling | doaj.art-80eaa5c90ffb4175ae905e23da966a232023-12-01T00:48:52ZengMDPI AGBatteries2313-01052022-04-01843310.3390/batteries8040033Influence of Switching on the Aging of High Power Lithium-Ion CellsGuy Williams Ngaleu0Michael Theiler1Xenia Straßer2Christian Hanzl3Lidiya Komsiyska4Christian Endisch5Meinert Lewerenz6Research Group Electromobility and Learning Systems, Technische Hochschule Ingolstadt, D-85049 Ingolstadt, GermanyResearch Group Electromobility and Learning Systems, Technische Hochschule Ingolstadt, D-85049 Ingolstadt, GermanyResearch Group Electromobility and Learning Systems, Technische Hochschule Ingolstadt, D-85049 Ingolstadt, GermanyResearch Group Electromobility and Learning Systems, Technische Hochschule Ingolstadt, D-85049 Ingolstadt, GermanyResearch Group Electromobility and Learning Systems, Technische Hochschule Ingolstadt, D-85049 Ingolstadt, GermanyResearch Group Electromobility and Learning Systems, Technische Hochschule Ingolstadt, D-85049 Ingolstadt, GermanyResearch Group Electromobility and Learning Systems, Technische Hochschule Ingolstadt, D-85049 Ingolstadt, GermanyFor intelligent battery systems that are able to control the current flow for each individual cell, the multilevel inverter is an interesting approach to replace the bidirectional AC/DC-converter and improve flexibility of charging system and signal quality in both directions. Therefore, the cells are modulated by switching varying the duty cycle, the current and the frequency up to the kHz-range. This is only beneficial if the switching does not lead to a significant additional aging. The scientific gap to assess and understand the impact of switching is investigated in this paper by testing 22 high-power 18650 lithium-ion cells (Samsung 25R). The cells are tested at 50 Hz and 10 kHz switching frequency during charge, discharge and charge/discharge at 50% duty cycle. The tests are compared to eight reference tests with continuous current flow performed at the average and the maximum current for charge and discharge, respectively. The results are obtained by evaluating the remaining capacity, resistance, electrochemical impedance spectroscopy and dV/dQ analysis. Before reaching rollover, the investigated cells lose homogeneity and cathode capacity but no significant difference for the aging parameters are found. After rollover, the cell-to-cell variation is greater than the aging induced by the different cycling parameters.https://www.mdpi.com/2313-0105/8/4/3318650NCAGraphiteswitchingmultilevel inverterfrequency |
| spellingShingle | Guy Williams Ngaleu Michael Theiler Xenia Straßer Christian Hanzl Lidiya Komsiyska Christian Endisch Meinert Lewerenz Influence of Switching on the Aging of High Power Lithium-Ion Cells Batteries 18650 NCA Graphite switching multilevel inverter frequency |
| title | Influence of Switching on the Aging of High Power Lithium-Ion Cells |
| title_full | Influence of Switching on the Aging of High Power Lithium-Ion Cells |
| title_fullStr | Influence of Switching on the Aging of High Power Lithium-Ion Cells |
| title_full_unstemmed | Influence of Switching on the Aging of High Power Lithium-Ion Cells |
| title_short | Influence of Switching on the Aging of High Power Lithium-Ion Cells |
| title_sort | influence of switching on the aging of high power lithium ion cells |
| topic | 18650 NCA Graphite switching multilevel inverter frequency |
| url | https://www.mdpi.com/2313-0105/8/4/33 |
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