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

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