Why 18650 lithium-ion batteries will explode? The relief valve can prevent explosion?

Source: 2020 - 04 - 15 18:09 hits: why 18650 lithium-ion batteries will explode? The relief valve can prevent explosion? Many people have a misconception that as long as the battery is very dangerous, especially that it is not safe to lithium batteries, would explode! 18650 battery really as dangerous as it says? In order to solve this problem, you need to know what is the 18650 battery? 18650 lithium ion battery today we often say that 18650 is actually refers to the appearance of the battery specifications, this is SONY battery model formulating standards for cost saving. 18 for 18 mm in diameter, 65 for a length of 65 mm, 0 for cylindrical batteries. 18650 battery originally refers to the nickel metal hydride battery and lithium ion battery, because now in the use of nickel metal hydride is less, so now refers to the lithium ion battery. A single 18650 lithium ion battery of the nominal voltage is commonly 3. 6 v or 3. 7v。 The minimum discharge termination voltage generally to 2. 75v。 General capacity is 1200 ~ 3000 mah, more than 3400 mah is likely to be the wrong standard. Since SONY launched 18650 batteries in the 1990 s, the battery has been around. 18650 batteries due to its large capacity, high storage efficiency, good stability, no memory effect, high cycle life, does not contain toxic substances, such as widely used in industrial and electronic devices such as laptop computers, walkie-talkies, instruments and meters, and even the world's most fire 18650 tesla battery electric cars is also provided by panasonic. Why is lithium battery explosion? Most of the 18650 batteries are packed in steel shell. Because of the lack of protection, poor quality of the battery in charge ( The overcharge) Under the condition of the internal pressure increases suddenly, over bearing value would explode. Short circuit, high temperature, extrusion and even breakdown can lead to problems such as battery explosion. Lithium battery short circuit short circuit protection, Dangerous operation, do not imitate) High quality 18650 lithium battery soak water have no problem ( Please do not imitate) What is a lithium battery safety valve? After 30 years of development, the preparation of 18650 battery technology is already very mature. Besides on the performance are greatly improved, its safety is also very perfect. In order to prevent metal shell explosion, battery is now installed a relief valve at the top. The relief valve is each battery standard parts, and most important barrier. When the battery internal pressure is too large, open at the top of the relief valve exhaust and decompression, to prevent the explosion. But when the relief valve opens, from inside the battery leakage of chemicals can react with oxygen in the air at high temperature, still can cause fire. In addition, now part of the 18650 battery built-in protection panel, with the charge and short circuit protection function, has the very high security performance. Lithium battery safety valve relief valve to break the relief valve to break the mobile power supply before the explosion happened, because of the factory in order to save costs by using inferior 18650 batteries, and even cause secondary waste electricity. Now the main production of 18650 batteries battery manufacturers such as SONY, panasonic, samsung, is actually very safe, and 18650 battery utilization rate is very high, we can make the proper use of batteries in daily use and avoid the short circuit, damage or excessive temperature, do not need to worry about the battery will explode. We can't use a bamboo poles are people with the same brush to determine the safety of the inferior products in 18650. One sentence summary: regular, quality qualified 18650 battery safety is very high, can be at ease use, if the figure is cheap to buy merchandise to the side of the road is safer, but don't look at your personality to the accident happened