Lithium ion explosion can be divided into internal short circuit fault,
external short circuit fault and overcharge.
The internal world here refers to the interior of the lithium ion cell,
including the lithium ion fault caused by poor design of the external insulation
layer. When the internal short circuit fault of the lithium ion battery and the
electronic components cannot disconnect the control circuit, high combustion
will occur outside the lithium ion battery, resulting in electrolytic
liquefaction of some lithium ion batteries and large battery shell. When the
external temperature of the rechargeable battery reaches 135 ℃, the
cost-effective diaphragm will close the small hole, the electrochemical
corrosion will stop or almost stop, the current will drop sharply, and the
temperature will gradually decrease to avoid explosion. However, the low
micropore clearance rate or the difficulty in closing the membrane paper at the
root of the micropore will cause the battery temperature to rise again, and a
large amount of lithium battery electrolyte will liquefy and liquefy, which will
eventually charge the battery shell, and even cause the battery temperature to
ignite and explode the raw materials.
The external short circuit fault is due to the penetration of the capillary
edge of the diaphragm between copper and platinum, or the formation of lithium
molecules. This tiny fibrous metal material will cause micro short circuit
fault. Because the needle is thin and has a certain resistance, the current is
not necessarily large. The observed condition is that the operation speed is too
fast, and most of them can be screened out by lithium ion or assembly plant. At
the same time, because the edge of the hair is very small, sometimes it will be
burned, leading to battery recovery. Therefore, the explosion probability is not
high due to short circuit fault. Such a method can lead to short battery
charging time from the outside of each lithium ion power plant, and the working
voltage is slightly lower than the battery charging time, but few explosion
accidents occur. Statistical analysis is applied. Therefore, the explosion
caused by short circuit due to explosion is mainly due to over charging. As the
electrode is filled with fibrous lithium metal crystals, the penetration points
can be seen everywhere, and there is a micro short circuit fault. Therefore, the
temperature of the battery will gradually increase, and eventually generate
lithium ion battery electrolyte vapor. In this case, whether the temperature is
too high to cause ignition and explosion of raw materials, or the vehicle body
is first split, causing gas and lithium metal materials to enter and produce
severe air oxidation, it is the end of the explosion
However, the explosion caused by external short circuit fault caused by
overcharging does not necessarily occur during battery charging. When the
battery temperature is not enough to ignite the raw materials, the existing gas
body may not be able to support the cracking of the battery shell, and the
customer will stop charging and take out the phone. At this time, the current
heat of many micro short circuit faults will gradually reduce the battery
temperature. After a period of time, the battery will explode. Customers
describe each other as finding their phones very hot when they pick them up, and
then throwing them away explodes.
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