In-Situ Detection of Thermal Runaway Gases of Lithium-Ion Batteries Based on Fiber-Enhanced Raman Spectroscopy

Gas detection is an effective early warning method of thermal runaway of lithium-ion battery (LIB). This paper proposes a method for in-situ detection of LIB thermal runaway gases based on Raman spectroscopy. Firstly, the detection platform is developed and the limit of detection (LOD) is obtained. According to the LOD, the sensitivity of gas Raman spectroscopy detection is significantly improved by fiber-enhanced technology. Next, a thermal runaway monitored by the platform is performed. Benefiting from the unique advantage of simultaneous and non-destructive analysis of Raman spectroscopy, real-time and in-situ detection of multiple gases generated during LIB thermal runaway is realized. A warning time of 526 s is achieved by the detection of CO2 in the early stage of thermal runaway, which provides sufficient time for battery safety management as well as personnel evacuation, and demonstrates the potential of gas Raman spectroscopy detection in LIB thermal runaway gas analysis and fault warning.