In Situ Measurement of Orthotropic Thermal Conductivity on Commercial Pouch Lithium-Ion Batteries with Thermoelectric Device

Luigi Aiello*, Georgi Kovachev, Bernhard Brunnsteiner, Martin Schwab, Gregor Gstrein, Wolfgang Sinz, Christian Ellersdorfer

*Corresponding author for this work

Research output: Contribution to journalArticle

Abstract

In this paper, the direct measurement of the orthotropic thermal conductivity on a commercial Li-ion pouch battery is presented. The samples under analysis are state-of-the art batteries obtained from a fully electric vehicle commercialized in 2016. The proposed methodology does not require a laboratory equipped to manage hazardous chemical substances as the battery does not need to be disassembled. The principle of the measurement methodology consists of forcing a thermal gradient on the battery along the desired direction and measuring the heat flux and temperature after the steady state condition has been reached. A thermoelectric device has been built in order to force the thermal gradient and keep it stable over a long period of time in order to be able to observe the temperatures in steady state condition. Aligned with other measurement methodologies, the results revealed that the thermal conductivity in the thickness direction (0.77 Wm−1K−1) is lower with respect to the other two directions (25.55 Wm−1K−1 and 25.74 Wm−1K−1) to about a factor ×35.
Original languageEnglish
Article number10
Number of pages17
JournalBatteries
Volume6
Issue number1
DOIs
Publication statusPublished - 10 Feb 2020

Keywords

  • Lithium ions batteries
  • thermal conductivity
  • thermoelectric
  • peltier
  • orthotropic
  • Thermoelectric device
  • Orthotropic
  • In situ
  • Thermal conductivity
  • Batteries
  • Lithium ions

ASJC Scopus subject areas

  • Energy Engineering and Power Technology
  • Electrical and Electronic Engineering
  • Electrochemistry

Fields of Expertise

  • Mobility & Production
  • Advanced Materials Science

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