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Energies 2013, 6(1), 400-410; doi:10.3390/en6010400
Article

Li-Ion Pouch Cells for Vehicle Applications — Studies of Water Transmission and Packing Materials

1,2,* , 2
,
1
,
3
 and
2
1 Scania CV AB, SE-151 87 Södertälje, Sweden 2 School of Chemical Science and Engineering, Department of Chemical Engineering and Technology, Applied Electrochemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden 3 Innventia AB, Drottning Kristinas väg 61, SE-114 28 Stockholm, Sweden
* Author to whom correspondence should be addressed.
Received: 12 November 2012 / Revised: 21 December 2012 / Accepted: 11 January 2013 / Published: 16 January 2013
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Abstract

This study includes analysis of encapsulation materials from lithium-ion pouch cells and water vapour transmission rate (WVTR) measurements. WVTR measurements are performed on both fresh and environmentally stressed lithium-ion pouch cells. Capacity measurements are performed on both the fresh and the environmentally stressed battery cells to identify possible influences on electrochemical performance. Preparation of the battery cells prior to WVTR measurements includes opening of battery cells and extraction of electrode material, followed by resealing the encapsulations and adhesively mounting of gas couplings. A model describing the water diffusion through the thermal welds of the encapsulation are set up based on material analysis of the encapsulation material. Two WVTR equipments with different type of detectors are evaluated in this study. The results from the WVTR measurements show how important it is to perform this type of studies in dry environment and apply a rigorous precondition sequence before testing. Results from modelling confirm that the WVTR method has potential to be used for measurements of water diffusion into lithium-ion pouch cells. Consequently, WVTR measurements should be possible to use as a complement or alternative method to for example Karl Fisher titration.
Keywords: hybrid electrical vehicle (HEV); lithium ion battery; pouch cell; water vapor transmission hybrid electrical vehicle (HEV); lithium ion battery; pouch cell; water vapor transmission
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.

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Svens, P.; Kjell, M.H.; Tengstedt, C.; Flodberg, G.; Lindbergh, G. Li-Ion Pouch Cells for Vehicle Applications — Studies of Water Transmission and Packing Materials. Energies 2013, 6, 400-410.

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