Year-end Sale % OFF 
Abstract
In this work, commercial 18650 lithium-ion cells with LiMn2O4, LiFePO4, and Li(Ni0.33Mn0.33Co0.33)O2 cathodes were exposed to external heating in an accelerating rate calorimeter (es-ARC, Thermal Hazard Technology (THT), Bletchley, UK), to investigate the thermal behavior under abuse conditions. New procedures for measuring the external and internal pressure change of cells were developed. The external pressure was measured utilizing a gas-tight cylinder inside the calorimeter chamber, in order to detect the venting of the cells. For internal pressure measurements, a pressure line connected to a pressure transducer was directly inserted into the cell. During the thermal runaway experiments, three stages (low rate, medium rate, and high rate reactions) were observed. Both the pressure and temperature change indicated different stages of exothermic reactions, which produced gases or/and heat. The onset temperature of the thermal runaway was estimated according to the temperature and pressure changes. Moreover, the different activation energies for the exothermic reactions could be derived from Arrhenius plots.
Highlights
To eradicate the dependence on petroleum and to reduce CO2 emissions, the best near-term solutions for vehicles are electric (EV) and hybrid electric vehicles (HEVs)
Several exothermic chemical reactions can occur inside a cell while the temperature rises
Thermal runaway can occur, resulting in leaks, smoke, gas venting, flames, etc., which may lead to a fire or explosion
Summary
To eradicate the dependence on petroleum and to reduce CO2 emissions, the best near-term solutions for vehicles are electric (EV) and hybrid electric vehicles (HEVs). Several exothermic chemical reactions can occur inside a cell while the temperature rises. This may generate heat that accumulates inside the cell and accelerates the chemical reaction between the cell components, if the heat transfer to the surroundings is not sufficient. In this case, thermal runaway can occur, resulting in leaks, smoke, gas venting, flames, etc., which may lead to a fire or explosion. To describe the thermal runaway, the main exothermic chemical reactions have to be identified
Sign-in/Register to view highlights & summary 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 callDisclaimer: 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.
