Inferior chargers can easily cause fires. Cheap and inferior chargers are not allowed.

Inferior chargers can easily cause fires

Cheap inferior chargers are not allowed

■ Current planning Li Huanyu

On the morning of July 25, a fire broke out in the Tonghui home garden district of Chaoyang District, causing the fire to be a mobile phone charger that was charging. Inferior chargers and chargers between different brands can be used to bury potential safety hazards on electrical appliances.

event

Charger aging causes fire

At 8:30 on the morning of July 25, a household at the sixth floor of No. 6 Building, Huimin Garden, Tonghui Home, Chaoyang District, caught fire.

According to eyewitnesses, when the incident occurred, there was a constant smoke coming out of the window of the fire-stricken people, and the residents who were working downstairs immediately called the police. Fortunately, there is a fire squadron in the community, and the fire is extinguished within ten minutes.

According to the residents in the fire house, the place where the fire broke out happened to be a charged mobile phone charger. The resident thought that the cause of the fire was probably caused by the inferior charger used.

Experiment 1

Cheap charger, simple internal parts

The reporter found that there are many chargers of various brands on the market, and the price gap is also very large. The cheapest is less than 3 yuan, and the most expensive is 200 yuan. Many chargers are just a plug, and it is not specified whether it is used by Apple phones or Android phones.

On some online shopping platforms, some mobile phone charging heads are priced at only about 2 yuan, and the store said that if you buy 10 or more, you can still post them. In addition to these online shopping platforms, some mobile phone chargers in stores are also very cheap, about 10 yuan abound, store introduction, this price of the charger is very popular, generally people who are anxious to buy.

The reporter bought a mobile phone charger worth 10 yuan. The appearance is similar to the green dot charger of the Apple mobile phone, but the weight of the two has a clear difference. The 10 yuan charger is lighter. After measuring the weight, only 17 grams, while the regular Apple Green Point charger weighs 27.1 grams, a difference of 10.1 grams. In addition, the cheap charger can be found through careful observation, the work is relatively rough, and even the pins are not parallel symmetrical.

After the reporter disassembled the charger, he found that the structure inside was relatively simple. Except for a USB port, two capacitors, a transformer, and a circuit board, the cost of these components was less than 4 yuan.

Don't buy a cheap charger

Because some manufacturers are too pursuing cost and profit, the circuit of the charger is too simple, there is no corresponding protection measures, and the assembly is rough, the wires inside are too thin, and the two small boards are not fixed. When the line is plugged, if the number of times is too high, or improperly applied, the two boards and the wires inside rub against each other, which is prone to short circuit and cause fire.

Therefore, the charger must purchase products produced by regular manufacturers.

Experiment 2

Small current charger

In the commercially available chargers, except for the rated output voltage of 5 volts (V), the output current specifications are generally 1 ampere (A) and 2 amps (A). Because the charger is difficult to distinguish the specific specifications in appearance, and sometimes many people do not have the habit of carrying multiple chargers with them, it often happens to pick up the charger for charging. Then, what happens when chargers of different specifications charge different sizes of mobile phones?

After a simple measurement, the reporter found that when using a charger with an output current of 1A to charge a mobile phone with a current input of 2A, it takes 4 hours to fully charge from 20% of the battery. During the charging process, the charger appears. Hot condition. When charging the brand mobile phone with a charger with an output current of 2A, it takes about two hours to fully charge from 20% of the battery. During the charging process, the charger does not appear hot.

It is recommended not to charge with a small current charger

It is understood that a small current can charge a high-current mobile phone, but the speed is slow, the charger will be in a load state for a long time, causing the charger to overheat, which easily causes the charger to age faster. When using a large current charger to charge a small current mobile phone, its charging effect will not be affected.

Our reporter Li Huanyu Zhang Qunyu J002 J261

Beware! Charging treasure will catch fire

At 7 o'clock on the evening of July 31, during the taxiing of China Southern Airlines flight CZ6163 from Beijing to Hangzhou, a passenger's charging treasure smoked.

After on-site inspection by the security inspection department, the passengers passing the safety inspection have a rated capacity of 5000mAh×2, the output voltage is 5V, and the rated energy is 50WH. The marking is clear and meets the civil aviation transportation standard. After the CZ6163 was launched normally, the process did not affect the normal operation of the Capital Airport.

Why does charging treasure smoke? Originally, the core components of the charging treasure mainly contain lithium ions or lithium polymers. Lithium is very reactive and emits flammable gases when exposed to water or humid air. Physical damage, ambient temperature, and short-circuiting of the positive and negative electrodes can cause combustion. Even more frightening is that once a lithium-containing battery is on fire, conventional liquid fire extinguishers simply won't work.

Previously, the life laboratory column had carried out related experiments on lithium batteries, and the experimenters had demolished the lithium battery casing. As the outer casing of the lithium battery ruptures, the battery bulges and the white smoke is emitted from the gap. The experimenter then poured the water on the lithium battery. The white smoke was even more powerful, and the sound of the thorn was also emitted. The water poured on the lithium battery also showed bubbling, and the water poured on the lithium battery was actually emitted by the battery. The heat that came out was baked and dried. Li Huanyu finishing

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