Combustion behavior of lithium iron phosphate battery induced by external heat radiation. (September 2017)

• Record Type: Journal Article
• Authors: Wang, Qingsong; Huang, Peifeng; Ping, Ping; Du, Yulong; Li, Ke; Sun, Jinhua
• Is Part Of: Journal of loss prevention in the process industries. Volume 49:Part B(2017)
• Page Start: 961
• Page End: 969
• Publication Date: 2017-09
• Subjects: Lithium ion battery safety -- Lithium iron phosphate battery -- Jet fire -- Heat release rate -- Heat radiation -- Thermal runaway; Chemical industries -- Safety measures -- Periodicals; 660.2804
• DOI: 10.1016/j.jlp.2016.12.002
• Languages: English
• ISSNs: 0950-4230

Abstract

Abstract: The combustion behavior of 50 Ah LiFePO4 /graphite battery used for electric vehicle is investigated in the ISO 9705 combustion room. The combustion is trigged by a 3 kW electric heater as an external thermal radiative source, and then the surface temperature, combustion behavior, heat release rate, flame temperature and mass loss rate are obtained. The thermal runaway occurs when the battery surface temperature reaches 126.7 ± 2.2 °C and releases the combustible gases. After its ignition, the combustion generally undergoes first jet fire stage, stable combustion stage, second even third jet fire stage, final stable combustion stage and extinguishes stage. The maximum heat release rate reaches 64.32 kW and the maximum heat release is 13.74 MJ. The heat release rate is closely synchronous with the mass loss rate, and the mass loss ratio reaches to 26.9%. These fundamental data can provide basic knowledge for the battery performance based fire safety design. Highlights: The combustion behavior of 50 Ah LiFePO4 /graphite battery is investigated under the ISO 9705. Thermal runaway occurs when the battery surface temperature reaches to 126.7 ± 2.2 °C. The maximum heat release rate is 64.32 kW for 50 Ah LiFePO4 /graphite battery. Three times jet fires are observed for the fully charged battery.