2000mah 18650 battery

Mobile phone lecture: Analysis of the causes and solutions of 2000mah 18650 battery explosion

Generally speaking, few people will associate mobile phone explosion with battery, but in fact, the real root cause of mobile phone explosion is 2000mah 18650 battery. There are two factors, one is the problem of the product itself; the other is the result of improper use. Now let's put these two factors aside for the time being, and talk about why batteries explode? First of all, we have to start with the principle of batteries, because most mobile phone batteries currently use lithium batteries, and lithium is a metal element with active chemical properties. It is favored due to its small size, high energy density, and insignificant memory effect. The battery cell is a storage device for electrical energy. When overcharge or overdischarge occurs, it is possible to break through the diaphragm in the battery cell of inferior battery, causing the positive and negative electrodes in the battery cell to short-circuit, which is easy to cause high temperature and high pressure and explosion. This also explains why most battery explosions occur when charging.

Uncharged batteries do not have the conditions for explosion, but some friends may ask again, why do some mobile phones explode when they are not charged? This is because the mobile phone has already generated a very high voltage during the charging process, reaching the critical point of the battery shell. When the external temperature, pressure, etc. exceed the critical point, or there is an external collision, it causes an explosion. For example, when we usually make calls, watch videos, play games, etc., the temperature of the mobile phone will rise.

Well, after understanding the principle of 2000mah 18650 battery explosion, we can understand the two explosion factors introduced earlier, so in short, there are mainly the following three points:

1. Battery quality problems: mainly due to internal defects in the battery, excessive impurities in raw materials, unqualified processes, and inadequate design of battery safety protection.

2. Long-term overcharging of the battery: Under long-term charging, overcharging and overcurrent will also cause high temperature and high pressure, thereby creating hidden dangers in use. Moreover, lithium batteries may discharge instantly under special conditions of temperature, humidity and poor contact, generating a large amount of current, causing natural or explosion.

3. Battery short circuit: When the mobile phone is in a high temperature state, or is hit, metal friction, etc., it may cause a battery short circuit, thereby causing an explosion.

What should we pay attention to in life

As the saying goes, "If you want to do your work well, you must first sharpen your tools." Today, mobile phones have become an indispensable communication device in life. When we understand the causes of 2000mah 18650 battery explosions, there is no need to worry too much about the impact on life. Here we also recommend some preventive measures.

1. Use a high-quality charger or an original charger. The charging process of lithium batteries is generally constant current first, then constant voltage charging. In order to ensure that the 2000mah 18650 battery is not easily overcharged, some mobile phone chargers have a self-discharge function after being fully charged, just to avoid overcharging.

2. Use original batteries, and be sure to avoid using counterfeit batteries and inferior batteries, because the surface of the general battery will be wrapped with a layer of safety film. When the pressure inside the battery reaches a certain level, the safety film will burst to release the pressure, and the battery itself will not explode. But inferior batteries may not have safety films. The difference between brand batteries of hundreds of yuan and those of thirty or forty yuan is not just the price.

3. Do not charge the phone at low temperature. When the temperature is below 0 degrees, the charging capacity will be significantly lower than the normal capacity, which will lead to the incomplete balance rate of positive and negative electrode reactions, resulting in the precipitation of excess lithium ions into crystals, causing the diaphragm to be punctured, causing a short circuit inside the battery and causing an explosion.

4. When charging, do not put the phone in a place where it is not easy to dissipate heat. Some people are used to throwing their phones in the quilt to charge before going to bed, which is very dangerous.

5. When charging, if the phone is abnormal, the power should be turned off immediately, and the phone should not be used immediately after the power is turned off, and do not use the phone to make calls. If the battery is deformed or bulging, do not use it, it is a time bomb.

6. Do not place the battery in a high temperature environment, and do not hit or squeeze it violently, so when charging, avoid sun exposure.

7. Turn the screen side of the phone toward you. Careful friends may find that the explosions of mobile phones are basically damaged on the back, especially the bottom of the battery, because that is the seam of the battery packaging, which is the most fragile. If we place the phone with the screen facing us, even if it explodes, the fragments will be ejected outward.

Summary: As a modern communication tool, mobile phones have brought great convenience to our daily lives, but there are always pros and cons. The explosion of mobile phones has also cast a shadow on our use. A large part of the reason is caused by inferior batteries, so we have to think about it. Since there are no technical obstacles, is it really difficult to unify the standards for mobile phone batteries that have been called for for many years? Not only is it more environmentally friendly, but it can also bring great safety and convenience to users. Really powerful manufacturers should ensure the market competitiveness of their products, rather than an extension of the huge profits of mobile phone batteries.

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