Investigation demonstrates accurate temperature monitoring of battery systems using optical fibers, indicating feasibility for large-scale applications.
The concept of Brillouin optical time domain reflectometry as a means of distributed temperature monitoring for battery systems is investigated and deemed feasible. The concept has been investigated regarding measurement speed, temperature accuracy, measurement range, and responsivity of the fiber material. The experiments show fast and accurate measurement results for surfaces with a uniformly distributed temperature, with an average absolute error of 0.51 K, a largest absolute error of 2.07 K, and a measurement time of approximately 60 s for a sampling point after 5 km. Additionally, hotspots only impacting 25% of the sensor fiber have been detected. Furthermore, the established concept provides a reliable and scalable solution for simultaneous temperature monitoring of spatially distributed sampling points without the need for individual cabling of every measurement sensor, like in commonly deployed electrical temperature detectors.
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Hilbert et al. (2026) studied this question.
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