Three common maintenance methods of mobile phone lithium battery;
1. Gently wipe the metal contacts on the lithium battery and the metal contacts on the mobile phone with a clean eraser or other cleaning tools, which is helpful to the charging state and the durability of the power.
2. Wrap the old mobile phone lithium battery that is automatically turned off firmly with plastic wrap, and try to be obedient when wrapping, with three layers inside and outside to ensure that the battery is in a vacuum state. Then wrap three layers of newspapers outside the plastic wrap and completely seal the lithium battery. Put it in the frozen layer of the refrigerator, and after 48 hours, take out the battery and remove the six layers of paper film wrapped around the battery one by one. The surface of lithium battery has not expanded or deformed due to freezing. After cooling for a period of time, charge.
3. Let the soon-to-be-scrapped lithium battery be completely discharged, and then recharge it to activate the battery. The specific method is: deep discharge of the mobile phone, that is, to achieve a deeper recharge by exhausting the internal power, which requires some unconventional methods. Connect the mobile phone to a small low-voltage light bulb with a special device, and the electricity in the battery will be conducted to the small light bulb until it is completely discharged. "The mobile phone needs to slowly run out of power through a lower voltage. Under normal circumstances, if the phone is connected below the rated voltage of 3.6 volts, it will automatically shut down. " After discharging, the rechargeable mobile phone battery can be used for a longer time.
Principles of three kinds of lithium battery repair methods;
Principle of lithium battery repair method 1: the metal surface of lithium battery used for a long time will be oxidized to a certain extent, which will lead to poor contact between mobile phone battery and mobile phone and shorten the service time of lithium battery. You can use an eraser or other cleaning tools to wipe off rusty substances on the surface, so that the battery can be in better contact with the mobile phone.
The second principle of lithium battery repair: Professor Ye from the Department of Physics of Zhejiang University gave a professional explanation on the "cryotherapy" of this lithium battery: "Low temperature can change the electrolyte inside the lithium battery and promote the chemical reaction of the battery that has just been frozen. The use of lithium batteries is actually a process of charging and discharging. During this period, the negative charge and positive charge in the battery collide with each other. The reason why the battery will become more and more useless is that at normal room temperature, the kinetic energy inside the electrons is relatively large, so the battery is in an active state and leaks frequently. When the lithium battery is placed in a low temperature environment, the microstructure of the lithium film and electrolyte on the surface of the lithium battery, as well as their interfaces, will change obviously, resulting in temporary inactivity inside the battery and reduced leakage current. Therefore, after recharging, the waiting time of the mobile phone will increase.
The cycle life of lithium battery is about 600 times. If the charging times are too many, the thermal movement of molecules will gradually destroy the internal molecular arrangement microstructure, and the charge storage efficiency will gradually decrease. And "the freezing process is easy to destroy the original internal structure of the battery, which may increase the charging capacity in a short time, but it may not be effective for long-term use." Professor Ye said that once the microstructure in lithium batteries is destroyed, it is impossible to fully recover. Long-term use of this method will accelerate the loss of mobile phone batteries.
The third principle of lithium battery repair method: deep discharge of mobile phone is to realize deeper recharging by exhausting internal electric energy, which requires some unconventional methods. Try to connect the mobile phone with a small light bulb of 1.5V, and the electricity in the lithium battery will be conducted to the small light bulb until it is completely discharged. "The mobile phone needs to slowly run out of power through a lower voltage. Under normal circumstances, if the phone is connected below the rated voltage of 3.6 volts, it will automatically shut down. " After discharging, the rechargeable mobile phone battery can be used for a longer time.
Repair of lithium battery of mobile phone —— Analysis of the whole process of "cryotherapy": Taking the original lithium battery of Nokia BL-5C purchased in April 2009 as the experimental object. Lithium batteries have been used for almost two years. Under normal use, the standby time of this mobile phone is about one day. If there are many calls, the battery life will be shorter. If the average talk time of each call is 3 minutes, and you answer or dial 10 times, the power will be in jeopardy.
Before the test, turn off the phone and turn it on after the battery is fully charged. From then on, you don't need this mobile phone to answer and make any calls, and you don't send or receive text messages. Without any interference, the mobile phone stood by quietly, and after nearly 3 days, it was completely dead.
Enter the experimental stage: put the fully equipped lithium battery of mobile phone into the freezer (in order to prevent the lithium battery from getting wet, you need to wrap the mobile phone firmly with plastic wrap first, and try to be obedient when wrapping it. It needs three layers inside and outside to ensure that the lithium battery is in a vacuum state. Then, wrap three layers of newspapers outside the plastic wrap and completely seal the cell phone battery. After 48 hours, the lithium battery was taken out and the six layers of paper film wrapped around it were removed one by one. The surface of the battery has not expanded or deformed due to freezing. After cooling for a period of time, put the lithium battery into the mobile phone and turn it on. In the same situation, on the third day, the mobile phone that would have automatically turned off was only missing one grid of electricity on the screen. A week later, there is still one cell left on the phone screen. On the ninth day, the mobile phone didn't give a prompt tone because of insufficient power.
The performance before and after the "cryotherapy" test proves that the first freezing of the battery can prolong the waiting time of the mobile phone. But freezing is not an "elixir of life" for mobile phone batteries, and long-term use will damage lithium batteries.
Experts remind that the price of lithium batteries should not be too high. It is more convenient and cost-effective to buy a new battery than to repair a lithium battery. In addition, developing good habits is also a shortcut to extend the life of lithium batteries.
According to the website of Dongguan Juda Electronics Co., Ltd.