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Why is the 18650 lithium battery unsafe

Many people have a misconception that batteries are dangerous, especially lithium batteries are very unsafe and will explode! Is the 18650 battery really as dangerous as the legend? To understand this problem, we must first understand-what is the 18650 battery?
18650, which we often say every day, actually refers to the external specifications of batteries. It is a standard battery model set by SONY Corporation of Japan in order to save costs, in which 18 means 18mm in diameter, 65 means 65mm in length and 0 means cylindrical battery. 18650 batteries used to refer to nickel-hydrogen batteries and lithium-ion batteries. Since nickel-hydrogen batteries are seldom used now, they now refer to lithium-ion batteries. The nominal voltage of 18650 lithium ion battery is generally 3.6V or 3.7V;; The minimum discharge termination voltage is generally 2.75V .. The common capacity is 1200 ~ 3000 mAh, and if it is higher than 3400mAh, it may be a virtual standard.
Since Sony introduced in 1990s, the 18650 battery has been enduring. 18650 battery is widely used in industrial fields and electronic equipment such as notebook computers, walkie-talkies, instruments and meters because of its large capacity, high energy storage efficiency, good stability, no memory effect, long cycle life and no toxic substances. Even the hottest Tesla electric car in the world uses the 18650 battery pack provided by Panasonic.
The vast majority of 18650 batteries are packaged in steel case. Because of the lack of protection function, the internal pressure of batteries with poor quality will suddenly increase when they are overcharged, and when they exceed the tolerance value, they will explode. Problems such as short circuit, high temperature, extrusion deformation or even puncture of the battery may cause the battery to explode.