Is the 18650 lithium battery safe?

The 18650 lithium battery is believed to be familiar to some friends. Due to its large unit density, most of it is used in notebook computer batteries. In addition, the 18650 has a very good stability at work and is widely used in major electronics. field. It is often used for high-grade strong light flashlight, portable power supply, etc..

The damaged 18650 lithium battery, which uses screws to fix the battery to the board, confirms that it is firmly fixed and uses a nail gun to shoot the battery shell. After many shots, the lithium battery shell has not been effectively destroyed.

In order to continue the test, the battery was damaged by using a flashlight to drill the screw. The battery burned violently at the moment of drilling through the shell. The sparks appeared to be extremely frightening until the steel shell was burned red. The flame slowly decreases.

The positive electrode of a lithium battery consists of a material containing lithium ions. The negative electrode is composed of graphite. The positive and negative poles are separated by a diaphragm, and then the electrolyte or electrolyte is injected to infiltrate the diaphragm. The diaphragm also plays an insulating role and has the effect of preventing short circuits and allowing lithium ions to pass through.

When the screw cuts the lithium battery, because the screw is metal, it will cause the battery to short circuit in contact with the positive and negative poles. Short circuit will release a lot of heat, and it will cause combustion.

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