With the increase of lithium-ion batteries energy density and capacity, the thermal explosion is becoming a significant issue that can't be ignored. In this work, one kind of commercial 18650 lithium-ion battery with different states of charge (SOCs) and cycling times is used to evaluate the thermal explosion hazards by a ramp heating method in an extend volume accelerating rate calorimeter (EV-ARC). Some thermal characteristic parameters are selected and analyzed from the experiment trails, such as the cell surface temperature, temperature raise rate, canister internal pressure and average canister temperature. The experiment results show that the maximum surface temperature of the battery and the maximum canister internal pressure increase with the increase of SOC when the thermal explosion occurs. The thermal energy released from the battery under different SOCs during thermal explosion is calculated using the initial and the maximum temperature on the battery and the canister surface. A fully charged fresh battery can release 61.7 kJ energy when it gets into thermal explosion, which could be converted to an explosion TNT-equivalent of 5.57 g. Compared with fresh batteries, aging batteries are more prone to get into thermal explosion and the thermal explosion hazards increase.

International Seminar on Fire and Explosion Hazards (9; 2019; Saint Petersburg, Russia). Proceedings of the Ninth International Seminar on Fire and Explosion Hazards [Электронный ресурс]: 21-26 April 2019, Saint Petersburg, Russia. Vol. 2 / Peter the Great St. Petersburg Polytechnic University, Autonomous Non-Profit Organization "Fire and Explosion Safety", Gefest Holding Ltd ; [edited by A. Snegirev [et al.]. — Электрон. текстовые дан. (1 файл : 98,7 Мб). — Saint Petersburg, 2019. — Загл. с титул. экрана. — Свободный доступ из сети Интернет (чтение, печать, копирование). — Adobe Acrobat Reader 7.0. — <URL:http://elib.spbstu.ru/dl/2/k19-97.pdf>. — <URL:http://doi.org/10.18720/SPBPU/2/k19-97>.