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Batteries 2016, 2(2), 8; doi:10.3390/batteries2020008

Method for Determination of the Internal Short Resistance and Heat Evolution at Different Mechanical Loads of a Lithium Ion Battery Cell Based on Dummy Pouch Cells

1
VSI—Institute for Vehicle Safety, Inffeldgasse 23/I, Graz University of Technology, 8010 Graz, Austria
2
ICTM—Institute for Chemistry and Technology of Materials, Graz University of Technology, Stremayrgasse 9, 8010 Graz, Austria
3
AVL List GmbH, Hans-List-Platz 1, 8020 Graz, Austria
4
Audi AG, Auto-Union-Strasse 1, 85045 Ingolstadt, Germany
*
Author to whom correspondence should be addressed.
Academic Editor: Juan Carlos Álvarez Antón
Received: 4 January 2016 / Revised: 26 March 2016 / Accepted: 30 March 2016 / Published: 7 April 2016
(This article belongs to the Special Issue Battery Modeling)
View Full-Text   |   Download PDF [1523 KB, uploaded 7 April 2016]   |  

Abstract

Within the scope of developing a multi-physical model describing battery behavior during and after the mechanical load (accelerations, intrusions) of a vehicle’s high voltage battery, an internal short circuit model is of deep interest for a virtual hazard assessment. The internal short resistance and the size of the affected area must be known as a minimum for determining the released heat and, in consequence, the temperatures. The internal short resistance of purpose-built dummy pouch cells, filled with electrolyte-like solvent without conductive salt, has thus been measured in a given short area under various compressive loads. The resistances for different short scenarios obtained are analyzed and described in a mathematical form. Short circuit experiments with dummy cells using an external power source have also been carried out. This set-up allows the measurement of the temperature evolution at a known current and a determination of the actual short resistance. The post-mortem analysis of the samples shows a correlation between the maximum temperatures, released short heat and the separator melt diameter. View Full-Text
Keywords: internal short-circuit modeling; contact resistance; mechanical load; current measurement; thermal behavior; separator melt internal short-circuit modeling; contact resistance; mechanical load; current measurement; thermal behavior; separator melt
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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. (CC BY 4.0).

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MDPI and ACS Style

Volck, T.; Sinz, W.; Gstrein, G.; Breitfuss, C.; Heindl, S.F.; Steffan, H.; Freunberger, S.; Wilkening, M.; Uitz, M.; Fink, C.; Geier, A. Method for Determination of the Internal Short Resistance and Heat Evolution at Different Mechanical Loads of a Lithium Ion Battery Cell Based on Dummy Pouch Cells. Batteries 2016, 2, 8.

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