Version 1
: Received: 4 November 2020 / Approved: 6 November 2020 / Online: 6 November 2020 (09:11:43 CET)
Version 2
: Received: 10 May 2021 / Approved: 12 May 2021 / Online: 12 May 2021 (14:06:24 CEST)
How to cite:
Ebert, F.; Spielbauer, M.; Bruckmoser, M.; Lienkamp, M. Simulation of Spatial Strain Inhomogeneities in Lithium-Ion-Cells Due to Electrode Dilation Dependent on Internal and External Cell Structures. Preprints2020, 2020110232. https://doi.org/10.20944/preprints202011.0232.v2.
Ebert, F.; Spielbauer, M.; Bruckmoser, M.; Lienkamp, M. Simulation of Spatial Strain Inhomogeneities in Lithium-Ion-Cells Due to Electrode Dilation Dependent on Internal and External Cell Structures. Preprints 2020, 2020110232. https://doi.org/10.20944/preprints202011.0232.v2.
Cite as:
Ebert, F.; Spielbauer, M.; Bruckmoser, M.; Lienkamp, M. Simulation of Spatial Strain Inhomogeneities in Lithium-Ion-Cells Due to Electrode Dilation Dependent on Internal and External Cell Structures. Preprints2020, 2020110232. https://doi.org/10.20944/preprints202011.0232.v2.
Ebert, F.; Spielbauer, M.; Bruckmoser, M.; Lienkamp, M. Simulation of Spatial Strain Inhomogeneities in Lithium-Ion-Cells Due to Electrode Dilation Dependent on Internal and External Cell Structures. Preprints 2020, 2020110232. https://doi.org/10.20944/preprints202011.0232.v2.
Abstract
Electrochemical-mechanical interactions, in particular pressure-induced ones, have been identified to be a cause for lithium-plating in lithium-ion cells. Mechanically-induced porosity inhomogeneities in the separator layers due to electrode expansion during charging especially lead to cell internal balancing currents and can cause localized plating. To identify cell-format and cell-material dependent mechanical weak spots, a layer-resolved mechanical simulation of different cell types and cell-material combinations is presented in this work. The simulation results show distinctive layer strain patterns for different cell-types that coincide with localized lithium-plating found in post-mortem cells. Additionally, the effects of cell bracing in battery modules is investigated and a method to mitigate the increased layer strain due to bracing counterforces is proposed that also increases cell energy density for hardcase-type automotive cells.
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Received:
12 May 2021
Commenter:
Fabian Ebert
Commenter's Conflict of Interests:
Author
Comment:
Minor changes:
- fixed typos - included changes of an external review (additional citations and more detailed discussion of the results) - added figures S.4 and S.5 (influence of mesh size and edge effects)
Commenter: Fabian Ebert
Commenter's Conflict of Interests: Author
- fixed typos
- included changes of an external review (additional citations and more detailed discussion of the results)
- added figures S.4 and S.5 (influence of mesh size and edge effects)