It is a habit of many people to carry a power bank when they go out, but the "temper" of the power bank is also worrying. Recently, the Hangzhou Xiaoshan Fire and Rescue Brigade carried out an experiment and found that when the power bank is short-circuited, it soars to 400 °C in more than 0 seconds!

It can soar to 400°C in just over 0 seconds

If a fire breaks out in a power bank, it can be extinguished with water

　　實驗用的都是常見的便攜式充電寶，容量均為1萬毫安培培時。首先，工作人員把充滿電的充電寶放置在操作臺上，隨後，手持老虎鉗夾住電池的正負極。10多秒鐘後，大量白煙從充電寶內噴涌而出，一股濃烈刺鼻的氣味迅速瀰漫在整個實驗區域。此時，測溫儀顯示幕上的數位急劇攀升，已經超過了400℃。

"This is the state of the power bank when it is short-circuited." The staff explained that the power bank interface part is exposed, and if you put metal objects such as keys and coins together with the power bank, if the key is inserted into the power bank interface, it may cause a short circuit.

In the case of short circuit, the power bank will continue to heat up, and the common fire extinguisher has no great effect, which cannot cool down the power bank, and it is easy to cause re-ignition. Therefore, the best way to extinguish a fire in a power bank is to use water.

"The power bank is an electrical appliance, will it not be electrocuted if you use water to extinguish the fire?" In the face of everyone's questions, the staff explained the reason - the power bank is not a complete battery, but several lithium batteries spliced together. If one of the batteries catches fire, even if it goes out, it may cause the other batteries to continue to catch fire or explode. Water can penetrate into the inside of the power bank, effectively extinguish the fire, and can cool the power bank well, effectively preventing re-ignition.

In addition, the voltage of the power bank is low, so if you extinguish it with water, you don't need to worry about electric shock.

The power bank can't withstand the "big effort"

Nor can it withstand the "high temperature test"

In the open experimental field, the staff picked up the fire axe and struck it heavily on the power bank with its back part. It can be seen that there are obvious cracks on the surface of the power bank. Immediately afterward, he struck again with the sharp blade of his axe. Just listening to the "bang", the power bank cracked instantly, and the smoke billowed out.

At this time, the onlookers at the scene couldn't help but be a little nervous, and everyone speculated about when the power bank would explode. About 2 minutes later, with a loud bang, the lithium battery that popped out of the shell exploded!

The power bank not only can't withstand the "strong effort", but also can't withstand the "high temperature test". When the staff carefully placed two different brands of power banks next to the lit wood, after about 3 minutes, the power banks began to smoke. When the staff threw the power bank directly into the fire, the power bank deflagrated and the flames went straight to the sky.

It is understood that when subjected to external impact, the internal circuit of the power bank is easily damaged, resulting in leakage of the battery cell, triggering a violent chemical reaction, which is very likely to cause smoke, fire and even explosion.

Remind everyone: when charging the power bank, do not place it in quilts, boxes and other places that are not conducive to heat dissipation, and do not expose it to the high temperature environment of direct sunlight, otherwise it is easy to cause spontaneous combustion and explosion.

Sweating after strenuous exercise

Pay attention when using power banks!

In order to simulate the scene of sweat soaking the power bank in summer, the staff also prepared a tray filled with salt water on the experimental table, and slowly put the lithium battery of the power bank into it. As soon as it comes into contact with the salt water, the surface of the battery begins to react violently, a large number of bubbles continue to emerge, the salt water quickly becomes turbid, and the yellow-green liquid seeps out from the inside of the battery, accompanied by a slight squeaking sound. It didn't take long for the surface of the power bank to corrode and emit an unpleasant pungent odor.

"When the moisture in sweat comes into contact with the electrolyte, it may produce a weak chemical reaction to form bubbles, and sweat contains salt and is electrically conductive." "Of course, we don't usually produce as much salt water or sweat as in the experiment, but through such experiments, we remind everyone that after strenuous exercise, do not wrap the power bank in sweaty clothes to avoid danger." ”

Again, a reminder to everyone

When using a power bank

Note the following

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Synthesis | Hangzhou release, China Fire Protection, etc

Source: Qingdao Daily