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Lithium-ion batteries have a higher energy density, especially the battery module, in the event of an accident, conventional means can not effectively control the rapid spread of heat or prevent the continuous explosion of the battery, which may have serious consequences. Especially in the case of lithium batteries burning or exploding during air transportation, the consequences to passengers and aircraft would be very serious or even catastrophic. So how exactly did the lithium battery accident happen, let’s look at the characteristics of the lithium battery itself. Lithium battery characteristics 1 High Energy Lithium battery is a high-energy item, if it catches fire and explodes, the danger is enormous. Take the 300Wh/kg square lithium ion battery for example, 1kg square lithium battery contains 1.08 × 10 6J of energy; 1g TNT can release 4184J of energy, the conversion shows that the energy contained in 1kg square lithium battery is equivalent to about 258g TNT, the energy containe