Why does the 18650 lithium battery explode?

Many people have a misunderstanding that as long as the battery is very dangerous, especially the lithium battery is very unsafe and will explode! Is the 18650 battery dangerous as the legend? To understand this problem, you must first understand - what is the 18650 battery?

The 18650 we often say is actually the shape specification of the battery. It is a standard battery model set by Japan SONY Company in order to save costs. Among them, 18 means diameter is 18mm, 65 means length is 65mm, 0 means cylindrical battery. The 18650 battery originally referred to the nickel-hydrogen and the lithium-ion batteries. Since nickel-hydrogen is now used less, it is now referred to as a lithium-ion battery. The nominal voltage of the single section of the 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 ~ 3000mAh, higher than 3400mAh is likely to be a virtual standard.

Since the introduction of Sony in the 1990s, the 18650 battery has been enduring for a long time. 18650battery is widely used in industrial fields and electronic devices such as notebook computers, walkie-talkies, instrumentation, etc. due to its large capacity, high energy storage efficiency, good stability, no memory effect, high cycle life and no toxic substances. The world's hottest Tesla electric car is also powered by Panasonic's 18650 battery pack.

Most of the 18650 batteries are packaged in a steel case. The battery with poor quality does not have a protection function. In the case of overcharging (overcharging), the internal pressure will suddenly increase, and when it exceeds the value, it will explode. Problems such as short circuits, excessive temperatures, or battery deformation or even puncture may cause the battery to explode.

What is a lithium battery safety valve?

After 30 years of development, the 18650 battery preparation process has been very mature, in addition to the performance has been greatly improved, its security is also very perfect. In order to avoid explosion of the sealed metal casing, the 18650 battery is now equipped with a safety valve at the top. The safety valve is standard for every 18650 battery and is the most important explosion-proof barrier. When the internal pressure of the battery is too large, the top safety valve will open the exhaust pressure to avoid explosion. However, when the safety valve is opened, the chemical leaking inside the battery will chemically react with the oxygen in the air under high temperature conditions, and there is still a possibility of fire. In addition, some 18650 batteries also come with a protective board, with overcharge and over-discharge and short-circuit protection, and the safety performance is very high.

The previous incidents of mobile power explosions were all caused by unscrupulous manufacturers using unqualified 18650 batteries for cost savings or even second-hand waste. At present, the 18650 batteries produced by major battery manufacturers such as Panasonic, Sony, Samsung, etc. are actually very safe, and the 18650 battery usage rate is very high. We can use it properly in daily use and avoid battery short circuit, damage or the temperature is too high, so you don't have to worry about the battery exploding. We can't overwhelm a boatman with a bamboo raft and use the inferior products to characterize the safety of the 18650.

One sentence summary: regular, quality qualified 18650 battery safety is very high, completely can be at ease use, if the figure cheap goods bought the side of the road is safer, but will have an accident just look at your personality ~

One sentence summary: The regular, quality-qualified 18650 battery is very safe and completely can be at ease use. If you buy roadside goods for the sake of cheap, although it is safe, let's pray that there will be no accidents.

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