The Thermal Runaway 1956 Accelerated rate calorimetry: to simulate the environment inside the battery Stage 1:onset 20 Thermal runaway of overheating 15 Stage 3:Combustion 10 SEI decomposition, and explosion separator melts,etc. 5 0 MMG -5 100 150 200 250 Stage 2:heat Temperature (C) Fig.2.Typical self-heating rate tests by ARC during thermal ramp test of LIB.The accumulation and anode is mesocarbon microbead graphite.The cathode is LiNio.sCoo.osAlo.osO2. gas release The electrolyte is 1.2 M LiPF in EC/PC/DMC.A Celgard 2325 trilayer separator was used.Adapted with permission from Electrochemical Society Inc. 7The Thermal Runaway Accelerated rate calorimetry: to simulate the environment inside the battery Stage 1: onset of overheating Stage 3: Combustion and explosion Stage 2: heat accumulation and gas release 7