controlling factors of cell design on large-format li-ion battery safety during nail penetration

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ID: 227324
2015
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Abstract
In this paper we investigate the controlling design parameters of large-format Li-ion batteries on safety while undergoing nail penetration. We have identified three critical design parameters that control the safety during the nail penetration process: nail diameter, single sheet foil area, and cell capacity.Using commercial AutoLion software, we have investigated two typical design problems related to the selection of cell thickness and aspect ratio, namely: (1) the safety ramifications of increasing cell capacity via greater cell thickness for a fixed footprint, and (2) the effect of aspect ratio, or single sheet foil size, on safety at a given capacity. For a fixed footprint, our results indicate that the safety of the cell can be predicted by (Qcell Dnail^-0.5). For a given cell capacity, our results indicate that typically a larger single sheet foil area leads to a greater likelihood for thermal runaway due to its effect of making the heating more local in nature; however, for small cells (~ 5Ah) and large nails (~ 20mm), the greater aspect ratio can lead to a safer cell, as the greater surface area strongly cools the global heating of the cell.
Reference Key
ewang2015frontierscontrolling Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors ;Qing eWang;Christian Edward Shaffer;Puneet K. Sinha
Journal geoheritage
Year 2015
DOI
10.3389/fenrg.2015.00035
URL
http://journal.frontiersin.org/Journal/10.3389/fenrg.2015.00035/full
Keywords
Simulation safety li-ion battery

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