1. Overheat Due Charging Excessive
charge too long
There are two factors why the lithium batteries can explode, which overheat because of overcharging as well as physical damage factor. This is usually because there is something wrong in the charging circuit, so that the charging continues, and to encourage chemical reactions. The battery was eventually overheat, but because it is still being filled, the system could not cool off and cause what is known as thermal runaway. see also : ( There is new in the new features facebook )
In this case, the battery hot start generating its own heat. So that makes part of the electrolyte becomes too hot and creates steam, and build pressure until solve the battery casing. The heat also spread to other components and highly flammable once exposed to air.
2.Physical damage
The lithium batteries are designed as light as possible, but to provide high output and easy to recharge. Barrier separating the electrode is very thin and lightweight. If the structure of the battery itself is damaged, then the short circuit will occur thus making electrolyte battery hot and create pressure and make the battery casing to rupture. The heat makes other components on fire spread.
It turns out that there is a thin casing on a smartphone is a precautionary measure in terms of safety. Because the thin metal casing to break more easily, so that the pressure generated but are too big can be cracked casing. Meanwhile, the metal can basically be able to channel the ventilation holes because of the heat. Just imagine, if the casing is thick smartphone and pressure resistance, the result would be more serious
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