Why Lithium ion Batteries catch fire?

Lithium-ion batteries can catch fire due to a process called thermal runaway. Thermal runaway occurs when the temperature of the battery increases rapidly, causing further increases in temperature and leading to a fire or explosion.

There are several factors that can contribute to thermal runaway in a lithium-ion battery:

1. Short circuit: If the positive and negative electrodes in a lithium-ion battery come into contact, it can create a short circuit, which can generate heat and lead to thermal runaway.
2. Overcharging: If a lithium-ion battery is charged beyond its maximum capacity, it can cause the battery to overheat and potentially lead to thermal runaway.
3. Physical damage: If a lithium-ion battery is damaged, it can expose the electrodes and lead to a short circuit, which can cause thermal runaway.
4. Manufacturing defects: Lithium-ion batteries can also be prone to thermal runaway if they are manufactured with defects that allow the electrodes to come into contact or that allow too much heat to build up within the battery.

It's important to note that lithium-ion batteries are generally safe when used and handled properly. However, it is important to follow the manufacturer's recommendations for charging and handling lithium-ion batteries to minimize the risk of thermal runaway. 

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