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Regarding automobiles, the main cause of spontaneous combustion of power lithium batteries is thermal runaway, and the most common causes of thermal runaway include severe collisions, system short circuits, etc.

First of all, let's talk about the first point, the combustion caused by collisions. Just as a power bank will spontaneously ignite upon severe impact, a power lithium battery will also spontaneously ignite upon impact. Regarding lithium-ion batteries, the severe deformation caused by intense collisions can cause internal short circuits. The energy possessed by the battery will be released from the short circuit point in one breath, causing local heating, leading to the decomposition of positive and negative electrodes and electrolyte, resulting in thermal runaway.

It can be said that spontaneous combustion caused by collisions is the best and also the most difficult to prevent. At present, in electric vehicles, the power lithium battery pack is arranged at the bottom of the car or trunk, which prevents fierce collisions as much as possible. At the same time, the design of the battery box can also protect the battery pack to a certain extent, which is where it is easy to prevent.

Just like traditional fuel vehicles that ignite the fuel tank after a severe collision or rollover, the power lithium battery pack of electric vehicles will still suffer severe impacts when the speed is too fast. At present, C-NCAP has made standardized requirements for collision testing of electric vehicles, with a testing standard of 64km/h for frontal collisions. This means that even five-star safe electric vehicles that suffer collisions above this speed still have the possibility of self ignition in power lithium batteries.

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