Strain Compensation Methods for Fiber Bragg Grating Temperature Sensors Suitable for Integration into Lithium-Ion Battery Electrolyte

Johanna Unterkofler*, Gregor Glanz, Markus Koller, Reinhard Klambauer, Alexander Bergmann

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

Temperature is a crucial factor for the safe operation of lithium-ion batteries. During operation, the internal temperature rises above the external temperature due to poor inner thermal conductivity. Various sensors have been proposed to detect the internal temperature, including fiber Bragg grating sensors. However, to the authors’ knowledge, there is no detailed description of the encapsulation of the fiber Bragg grating sensor in the literature to shield it from strain. In this study, different encapsulation methods for strain compensation were compared to find the encapsulation material most compatible with the electrolyte. For this, we stored the proposed sensors with different encapsulation methods in ethylene carbonate:ethyl methyl carbonate (EC:EMC) 3:7 with LiPF6 (lithium hexafluorophosphate) electrolyte and applied temperature changes. After evaluating the sensor encapsulation methods in terms of handling, diameter, uncertainty, usability, and hysteresis behavior, the most suitable sensor encapsulation was found to be a fused silica capillary with polyimide coating.
Original languageEnglish
Article number34
JournalBatteries
Volume9
Issue number1
Early online date3 Jan 2023
DOIs
Publication statusPublished - Jan 2023

Keywords

  • electrolyte
  • fiber Bragg grating
  • fiber optic sensor
  • internal temperature
  • lithium-ion battery
  • sensor encapsulation

ASJC Scopus subject areas

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

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