Hu S, Li J Q, He Y T, et al. Surface Physical Field Monitoring of Lithium Ion Batteries based on Fiber Bragg Grating Sensors[J]. Study on Optical Communications, 2025(5): 250253.
Hu S, Li J Q, He Y T, et al. Surface Physical Field Monitoring of Lithium Ion Batteries based on Fiber Bragg Grating Sensors[J]. Study on Optical Communications, 2025(5): 250253. DOI: 10.13756/j.gtxyj.2025.250253.
Surface Physical Field Monitoring of Lithium Ion Batteries based on Fiber Bragg Grating Sensors
have great potential for monitoring the surface states of Lithium Ion Batteries (LIBs). However
conventional single-point or low-channel deployment schemes struggle to capture the full thermo-mechanical response across the battery surface
compromising the ability to effectively resolve internal electrochemical processes.
【Methods】
2
To address this
a high-density sensing array comprising 6 channels and 24 FBGs was attached to the surface of a prismatic ternary LIBs cell
enabling real-time
multi-point monitoring.
【Results】
2
Under conventional C-rate cycling
the system recorded surface temperature rises up to 25 °C and the peak strain achieves near 900 με
with a final accumulated strain of 450 με. While temperature and strain scale with C-rate under normal conditions
this relationship breaks down at higher rates due to insufficient time for heat and stress transfer. These findings highlight the roles of electrochemically driven thermal buildup
volumetric expansion
and stress propagation in battery operation.
【Conclusion】
2
This FBG sensing system enables in-situ characterization of the thermo-mechanical behavior of LIBs by capturing spatially resolved temperature and strain data. It supports early detection of thermal runaway and mechanical failure. The findings provide robust experimental evidence for elucidating the electrochemical evolution mechanisms of LIBs.
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Keywords
references
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