Distributed thermal monitoring of lithium ion batteries with optical fibre sensors

• DOI: 10.1016/j.est.2021.102560
• Publication Date: 2021-04-30T00:00:47Z
• Authors: Yifei Yu; Elena Vergori; Daniel Worwood; Yashraj Tripathy; Yue Guo; Aurelio Somá; David Greenwood; James Marco
• Keywords: Thermocouple

Real-time temperature monitoring of li-ion batteries is widely regarded within the both academic literature and by industrial community as being a fundamental requirement for reliable safe operation battery systems. This particularly evident larger format pouch cells employed in many automotive or grid storage applications. Traditional methods measurement, such inclusion individual sensors mounted at discrete locations on surface cell may yield incomplete information. In this study, novel Rayleigh scattering based optical fibre sensing technology proposed demonstrated to deliver distributed, real-time accurate measure that suitable use with Li-ion cells. The thermal behaviour an A5-size experimentally investigated over wide range ambient temperatures electrical load currents, during charge discharge. A distributed sensor (DFOS) used in-plane difference across movement hottest region operation, where amongst different measuring points. Significantly, DFOS results highlight maximum was found be up 307% higher than measured using traditional thermocouple approach.