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)
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. Journal of Energy Storage 2022, 49, 104143, doi:10.1016/j.est.2022.104143.
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. Journal of Energy Storage 2022, 49, 104143, doi:10.1016/j.est.2022.104143.
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. Journal of Energy Storage 2022, 49, 104143, doi:10.1016/j.est.2022.104143.
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. Journal of Energy Storage 2022, 49, 104143, doi:10.1016/j.est.2022.104143.
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.
