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Batteries 2018, 4(2), 23; https://doi.org/10.3390/batteries4020023

Simultaneous Sensing of Temperature and Bi-Directional Strain in a Prismatic Li-Ion Battery

Department of Physics and I3N, University of Aveiro, Campus de Santiago, 3810-193 Aveiro, Portugal
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Received: 17 April 2018 / Revised: 27 April 2018 / Accepted: 4 May 2018 / Published: 10 May 2018
(This article belongs to the Special Issue Thermal and Safety Properties of Materials, Cells and Batteries)
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Abstract

Thermal and pressure stability of Li-ion batteries (LiB) are the most important parameters for safety. In abuse operating conditions, the rapid increase of temperature and pressure can cause the appearance of hot-spots, which may lead to an increasing degradation rate or even to the battery’s explosion and/or combustion. A sensing network of fiber Bragg gratings is attached to the surface of a prismatic LiB to monitor its temperature and bi-directional strain variations through normal charge (0.70 C) and two different discharge rates (1.32 C and 5.77 C) in the x- and y-directions. More significant variations are registered when the LiB operates in abnormal conditions. A maximum temperature variation of 27.52 ± 0.13 °C is detected by the sensors located close to the positive electrode side. Regarding strain and consequent length variations, maximum values of 593.58 ± 0.01 µε and 51.05 ± 0.05 µm are respectively obtained by the sensors placed on the y-direction. The sensing network presented can be a solution for the real-time monitoring, multipoint and in operando temperature and bi-directional strain variations in the LiBs, promoting their safety. View Full-Text
Keywords: Li-ion batteries; fiber Bragg grating sensor; strain; temperature; safety Li-ion batteries; fiber Bragg grating sensor; strain; temperature; safety
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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 (CC BY 4.0).
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Nascimento, M.; Ferreira, M.S.; Pinto, J.L. Simultaneous Sensing of Temperature and Bi-Directional Strain in a Prismatic Li-Ion Battery. Batteries 2018, 4, 23.

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