Abstract
With the diversification of lithium-ion battery (LIB) application scenarios, the thermal runaway (TR) mechanism of LIBs under complex nail penetration conditions has become increasingly complex, becoming one of the key bottlenecks restricting the safe prevention and control of TR of LIBs. In this paper, an experimental platform for coupled stimulations of heat-penetration on LIBs was built, aiming to study the effects of penetration depth (4.5 mm, 9 mm, 13.5 mm, 18 mm), penetration diameter (3.3 mm, 5.3 mm, 7.3 mm), and nail material (steel, ceramic) on TR under 100 °C. The results showed that with the increase of penetration depth, the maximum temperature of cell will decrease. From 4.5 to 18 mm, the maximum temperature of cell with 100% SOC decreased from 867.6 °C to 711.1 °C, a decrease of 18.04%. When penetration depth is 4.5 mm, and the diameter of steel nail is 7.3 mm, the temperature of cell is the highest and the thermal hazard is the highest. The maximum temperature of TR jet flame, the propagation speed of TR flame, and the area of TR jet flame all increase with the increase of penetration depth. When penetration depth is 18 mm, and the diameter of ceramic nail 7.3 mm, the flame temperatures of the 75% SOC and 100% SOC cells were 952.4 °C and 913.4 °C, respectively, which were higher than those of 932.0 °C and 906.5 °C when induced by a steel nail. The ceramic nail increased the fire risk of TR in LIBs. The mass loss increases with the increase of penetration depth and penetration diameter, and the mass loss under ceramic nail stimulation is greater than that under steel nail stimulation. More than 60% of particles with a diameter less than 10 μm are found to contain toxic substances (such as LiF) in the ejected particles, which can enter the human and cause damage the human body. The research results have important guiding significance for the intrinsic safety design of LIBs.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: International Communications in Heat and Mass Transfer
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
