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

Pontus Svens, Maria Hellqvist Kjell, Carl Tengstedt, Göran Flodberg and Göran Lindbergh
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Pontus Svens: Scania CV AB, SE-151 87 Södertälje, Sweden
Maria Hellqvist Kjell: School of Chemical Science and Engineering, Department of Chemical Engineering and Technology, Applied Electrochemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden
Carl Tengstedt: Scania CV AB, SE-151 87 Södertälje, Sweden
Göran Flodberg: Innventia AB, Drottning Kristinas väg 61, SE-114 28 Stockholm, Sweden
Göran Lindbergh: School of Chemical Science and Engineering, Department of Chemical Engineering and Technology, Applied Electrochemistry, KTH Royal Institute of Technology, SE-100 44 Stockholm, Sweden

Energies, 2013, vol. 6, issue 1, 1-11

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 (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2013
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