Development and evaluation of in-situ instrumentation for cylindrical Li-ion cells using fibre optic sensors

Joe Fleming, Tazdin Amietszajew, Euan McTurk, Dave Greenwood, Rohit Bhagat

Research output: Contribution to journalArticlepeer-review

46 Citations (Scopus)
142 Downloads (Pure)


This work demonstrates the development and evaluation of FBG optical fibre sensor technology for monitoring the distributed in-situ in-operando temperature of cylindrical 18650 lithium-ion cells. The influence of the sensing element on the electrochemical system was evaluated using EIS, CT scanning and cell cycling characterisation and was proven to be negligible. Furthermore, the FBG sensors were proven to be resistant to the strain imposed during the cell instrumentation procedure and the harsh chemical environment inside the Li-ion cells. The sensing methodologies and modification techniques developed in this work can be applied to large scale battery modules and pack systems and integrated within the cell manufacturing process. This work identified a clear and significant difference between the cells can and core temperatures of up to 6 °C at discharge and 3 °C at charge, as well as axial temperature gradient. The findings of this study are of significance to the performance and safety limits of energy storage systems. This article indicates the clear need for reliable sensing systems that enable accurate in-situ in-operando monitoring of lithium-ion energy storage systems.

Original languageEnglish
Pages (from-to)100-109
Number of pages10
Publication statusPublished - Apr 2018
Externally publishedYes

Bibliographical note

C 2018 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY license (

Copyright © and Moral Rights are retained by the author(s) and/ or other copyright owners. A copy can be downloaded for personal non-commercial research or study, without prior permission or charge. This item cannot be reproduced or quoted extensively from without first obtaining permission in writing from the copyright holder(s). The content must not be changed in any way or sold commercially in any format or medium without the formal permission of the copyright holders.


  • Cell instrumentation
  • Cell performance
  • Distributed thermal monitoring
  • FBG sensor
  • Optical technology
  • Thermal management

ASJC Scopus subject areas

  • Civil and Structural Engineering
  • Biomedical Engineering
  • Instrumentation
  • Mechanical Engineering
  • Industrial and Manufacturing Engineering


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