Hollow-core Fiber Enhanced Raman Spectroscopy Detection Technique with Synergistic Noise Reduction for Thermal Runaway Gases of Lithium-ion Battery
Accurate detection of thermal runaway gas is the key to ensure the safe and reliable operation of lithium-ion batteries.Aiming at the problems of easy aging,cross-interference and low Raman spectroscopy sensitivity of common methods for thermal runaway gas detection,this paper proposes a thermal runaway gas detection method for lithium-ion batteries based on hollow-core fiber enhanced Raman spectroscopy with synergistic noise reduction.Based on charge coupled device and pinhole synergistic noise reduction,the signal-to-noise ratio is increased by 2.2 times.The detection limits of H2,CO2,C2H2,CO,CH4,C2H6 and C2H4 are 3.71×10-5,1.98×10-5,6.2×10-6,9.2×10-6,2.6×10-6,9.1×10-6 and 4.1×10-6,respectively.Based on the Raman spectroscopy,the dynamic analysis of 7 thermal runaway fault gases(namely,H2,CO2,C2H2,CO,CH4,C2H6 and C2H4)of 18650 battery is completed.Finally,9 thermal runaway gas components in total are detected,namely H2,CO2,C2H2,CO,CH4,C2H6,C2H4,C3H6 and HF.The results show that the hollow-core fiber enhanced Raman spectroscopy technology can provide important supports for thermal runaway gas analysis of lithi-um-ion batteries.
hollow-core fiberlithium-ion batteryRaman spectroscopythermal runaway gas analysisin-situ detection
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维普
