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Batteries 2018, 4(2), 23;

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
Author to whom correspondence should be addressed.
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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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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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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