703048 battery.Analysis and solutions to the causes of mobile phone battery explosion

According to foreign media reports, when an American user woke up in the morning, she found that her iPhone 4 charging on the bedside suddenly smoked and made a hissing sound. Fortunately, she wrapped the smoking phone in her laptop bag. It was thrown into the sink and no accident happened. This is a real case, and this is not the first case of mobile phone battery explosion. When searching for "mobile phone battery explosion" on Baidu, there were 1,460,000 related searches, which is shocking. After seeing these shocking explosions, I believe many friends are palpitating. So should we also reflect on what causes mobile phone batteries to explode? Is it a product quality problem or is it the result of improper long-term use of the battery? Today, let us have an in-depth understanding of the causes of mobile phone battery explosions, and at the same time talk to you about some precautions for mobile phone charging and battery maintenance.


Generally speaking, few people would associate mobile phone explosions with batteries, but in fact, the real root cause of mobile phone explosions is mobile phone batteries. There are nothing more than two factors here, 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. Let's first talk about why batteries explode? First of all, we have to start with the principle of batteries, because currently most mobile phone batteries use lithium batteries, and lithium is a metal element with active chemical properties. It has advantages such as small size, high energy density, and insignificant memory effect. It is highly favored, and the battery cell part is a storage device for electrical energy. When overcharge, over-discharge, etc. occur, it may break down the separator in the inferior battery cell, causing the positive and negative electrodes in the battery cell to A short circuit can easily cause high temperature and high pressure and lead to an explosion. This also explains why most battery explosions occur when charging.


An uncharged battery does not have the conditions to explode, but some friends may ask again, why do some mobile phones explode even if they are not charged? This is because the previous charging process of the mobile phone has caused a very high voltage, reaching the critical point of the battery casing. When the external temperature, pressure, etc. exceed the critical point, or an external collision occurs, an explosion occurs. For example, when we usually make phone calls, watch videos, play games, etc., the temperature of our mobile phones will increase.


Okay, after understanding the principle of mobile phone battery explosion, we can easily understand the two explosion factors introduced earlier, so in simple terms, the main three points are:


1. Quality problems of the battery itself: Mainly caused by internal defects of the battery, excessive impurities in raw materials, unqualified workmanship, and inadequate battery safety protection design.


2. Long-term overcharging of the battery: When the battery is charged for a long time, overcharging and overcurrent will also cause high temperature and high pressure, thus causing hidden dangers. Moreover, lithium batteries may discharge instantaneously and generate a large amount of current under special conditions such as temperature, humidity, and poor contact, causing natural disasters or explosions.


3. Battery short circuit: When the mobile phone is in a high temperature state, or is subject to impact, metal friction, etc., the battery may be short circuited, causing an explosion.


How to pay attention in life


As the saying goes, "If you want to do your job well, you must first sharpen your tools." Today, when mobile phones have become an indispensable communication device in life, when we understand the causes of mobile phone battery explosions, we don't need to worry too much about the impact on our lives. , here we also recommend some preventive measures for everyone.


Mobile Phone Lecture: Analysis and Solutions to Causes of Mobile Phone Battery Explosion


Professionally customized? Does this really work?


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


2. When using original batteries, be sure to avoid using copycat batteries or inferior batteries, because generally the battery will be covered with a 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 Will explode. However, low-quality batteries may not have safety films. The difference between a brand-name battery of a few hundred units and one of 30 or 40 units is not just in price.


3. Do not charge the mobile phone at low temperatures. At low temperatures below 0 degrees, the charged power will be significantly lower than the normal power, which will lead to insufficient reaction between the positive and negative electrodes and the balance rate cannot be achieved, causing excess lithium ions to form crystals. Precipitates, causing the separator to be punctured, causing a short circuit inside the battery and causing an explosion.


4. When charging, do not place the mobile phone in a place where heat is not easy to dissipate. Some people are used to leaving the mobile phone under the bed to charge before going to bed, which is very dangerous.


5. If you find that your phone is abnormal while charging, you should immediately cut off the power. Do not use the phone immediately after the power is cut 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 subject it to severe blows or squeezes. Therefore, avoid sunlight exposure when charging.


7. Turn the phone with the screen side toward you. Careful friends may find that the damage to those exploding mobile phones is basically on the back, especially the bottom of the battery, because that is the seam where the battery is packaged and is the most vulnerable. If we put 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 advantages and disadvantages. The explosion of mobile phones has also cast a shadow on our use. A large part of the reason is due to inferior batteries, so we have to think about it. Since there are no technical obstacles, is it really difficult to have a unified standard for mobile phone batteries that has been called for for many years? Not only is it more environmentally friendly, but it also brings great safety and convenience to users. Truly powerful manufacturers want to ensure the market competitiveness of their products, not an extension of the huge profits from mobile phone batteries.

Read recommendations:

801752 720MAH 3.7V

Definition of cylindrical lithium battery

In - Depth Explanation of the Working Principle of Polymer Batteries

AA Ni-MH battery Vendor

18650 lithium battery 3000mah