Preprint Article Version 1 Preserved in Portico This version is not peer-reviewed

Simulation of Spatial Strain Inhomogeneities in Lithium-Ion-Cells Due to Electrode Dilation Dependent on Internal and External Cell Structures

Version 1 : Received: 4 November 2020 / Approved: 6 November 2020 / Online: 6 November 2020 (09:11:43 CET)

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. Preprints 2020, 2020110232 (doi: 10.20944/preprints202011.0232.v1). 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 (doi: 10.20944/preprints202011.0232.v1).

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.

Subject Areas

Lithium-ion-cell; Electrode dilation; Mechanical strain; Cell-format; Layer resolved mechanical simulation

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