What was the source of the explosion? How to prevent your phone from exploding?

Recently, the "explosion of mobile phones" related to the news, which makes many people are usually inseparable mobile phone full of vigilance. But just because your phone might explode doesn't mean you don't use it at all, does it? The reporter interviewed zhou hongzhi, an associate professor at the school of applied mathematics and science at Beijing university of technology.

What was the source of the explosion?

Zhou hongzhi said that the root cause of the explosion of mobile phones is in the mobile phone battery, specifically divided into internal and external causes. The internal reason is that the quality of mobile phone battery is not up to standard. Most mobile phones now use lithium batteries. The storage capacity of lithium battery is related to the activity of lithium metal. If the activity of lithium metal is good, the storage capacity of lithium battery will be high. Lithium metal is less active, lithium battery storage capacity is low. Some manufacturers will inappropriately increase the activity of lithium metal in order to increase the storage capacity of the battery. But the stronger the activity of lithium metal, the greater the possibility of dendrite generation and short circuit inside the battery, and the higher the possibility of phone explosion.

The external cause is the main cause of mobile phone explosion, which is directly related to the mobile phone charger. According to zhou, when charging a mobile phone, the charger will convert the household voltage of 220 volts into a working voltage of about 5 volts. This process requires that the components of the charger have good insulation performance and the manufacturing process should meet strict quality standards. As the insulation capacity of some components and insulating materials in the charger is related to the consumed power of the charger, the insulation capacity will decrease with the increase of consumed power. In the charging process, if the design circuit of the charger is inborn insufficient, the quality of components is poor, and the manufacturing process is not up to standard, its insulation will be easily damaged, which will easily cause voltage breakdown, leading to the explosion of the mobile phone. In particular, the circuit design of some chargers has its own problems, there are great safety risks, it is suggested that people should pay more attention to the quality of cheap chargers.

What could happen to the phone that could explode?

Zhou hongzhi reminds us that in most cases, mobile phones tend to be too hot before the explosion, so if you find the mobile phone is too hot, you must pay attention to it. But according to zhou hongzhi, if there is a problem with the quality of the cell phone battery itself, there is often not much warning before the explosion, and the heating process is very fast, making it difficult for people to respond in time. When there is no quality problem in the phone battery itself, if there are some abnormal phenomena in the charging process of the phone, such as the mush smell of the charger and the abnormal hot of the phone, we need to be vigilant. At present, many of the better smartphones have overheating protection, that is, when the heat exceeds the limit, will automatically cut off the power supply; But for the low-quality charger high-voltage breakdown, overheating protection is powerless.

In addition, zhou hongzhi suggested that if you find the mobile phone battery convex, charging too slow, and other conditions, that the battery itself has been aging or damaged, should be replaced in a timely manner.

How to prevent your phone from exploding?

Zhou hongzhi said, personally, in order to protect their own safety, should pay attention to the following points:

1, in the purchase of mobile phones and chargers, must go to the formal store to buy products after the national 3C certification, do not in order to cheap to buy fake products.

2, it is best to use the original charger to charge the mobile phone, the charger of different mobile phone is best not to mix.

3, do not wait for the phone is out of power to charge, this will reduce the battery activity, accelerate the aging of the battery, it is best to charge the phone when there is more than 30% of the power.

4. Non-professionals should not disassemble the mobile phone and its battery. If the mobile phone battery is removable battery, also be sure to turn off the phone before disassembly.

5. Do not keep your phone in a place with high temperature. The working environment temperature of the mobile phone is generally between -20 c and 45 c.

The page contains the contents of the machine translation.