The 18650 lithium battery is a standard lithium-ion battery launched by Sony, the founder of lithium-ion batteries, to save costs. where 18 represents a diameter of 18mm, 65 represents a length of 65mm, and 0 represents a cylindrical battery. In general, 18650 batteries included li-ion batteries and LiFePO4 batteries. The nominal voltage of the lithium-ion battery is 3.7v, the charge voltage is 4.2v, the nominal voltage of the LiFePO4 battery is 3.2v, the charge voltage is 3.6v, and the general capacity is 1200mAh-3500mAh.
Many people have a misunderstanding that as long as the battery is dangerous, especially the lithium-ion battery is very dangerous, it will burst! Does 18650 battery really sound so dangerous? In order to find out the truth, you need to understand what 18650 battery is?
Since Sony developed the 18650 battery in the 1990s, it has been always popular. Due to its large capacity, high storage efficiency, excellent stability, no memory effect and high cycle life, 18650 batteries are widely used in industrial and electronic equipment such as laptops, interphone, flashlight, and robot. Tesla is one of the most popular 18650 battery electric car, its battery is also supplied by Panasonic.
Why do lithium-ion batteries explode?
Most of the 18650 batteries are encapsulated in a steel case, the internal pressure of the battery will suddenly increase because of overcharge, and the battery will burst if the steel case exceeds the withstand value. Short circuit, high temperature, battery squeeze deformation, or even being punctured, can cause the battery to burst.
What is a lithium ion battery safety valve?
After 30 years of development, the 18650 battery production technology is now very mature, in addition to the performance is improved greatly greatly, its safety is also complete. In order to prevent the sealed metal casing from bursting, the 18650 battery has a safety valve on the top now, which is the standard for every 18650 battery and the most important explosion-proof component. When the internal pressure of the battery is too high, the top safety valve will open to release the pressure and prevent explosion. However, when the safety valve is opened, the chemical substances released by the battery will react with oxygen in the air at high temperatures, there may be a fire. In addition, some 18650 batteries now have their own PCB, which have overcharge and short-circuit protection, and their safety performance is very high.
Safety valve broken
The previous power bank explosions were all because manufacturers used bad quality 18650 batteries to save money. Now the 18650 battery which produced by famous battery manufacturers, such as Panasonic, Sony, Samsung, etc. is actually very safe, and the 18650 battery is very efficient. we can use it correctly in daily and prevent battery from short circuit, damage or high temperature, do not worry about the battery will burst. We cannot judge the safety of 18650 only by low quality products.
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