A recent rumor is circulating that lithium batteries that are about to expire can be brought back to life and reused after being frozen in the refrigerator for three days.
Specific method:
You can wrap the problem battery tightly in plastic wrap, making sure it does not leak (moisture will enter if there is an air leak ), then put it in the refrigerator. Freeze for about three days. Then take it out and leave it at room temperature for a day (do not remove the plastic film when removing it for the first time, as the temperature difference will be too great and cause condensation to form and the battery will be discarded), then fully charge it again. After three deep charges and discharges, the battery should now return to a level similar to new.
Lithium-ion batteries use carbon materialsas the negative electrode and compounds containing lithium as the positive electrode. There is no metallic lithium, only lithium ions. Lithium-ion battery refers to the general term for batteries using lithium-ion intercalation compounds as positive electrode materials. The charging and discharging process of lithium-ion batteries is the process of intercalation and deintercalation of lithium ions. During the process of intercalation and deintercalation of lithium ions, it is also accompanied by the incorporation and deintercalation of electrons equivalent to lithium ions (it is customary to express the positive electrode as insertion or deintercalation, and the negative electrode by insertion or deintercalation). During the charging and discharging process, lithium ions are intercalated/deintercalated and inserted/deintercalated between the positive and negative electrodes, which is vividly called "charging battery".rocking ease.”
How to Fix Damaged Cell Phone Battery Black Bottom
Battery is a very important part of the mobile phone. battery to work, but the battery lasts a long time. After that there will be some problems. So, how to repair cell phone lithium battery? Let me explain below!
How to repair cell phone lithium battery
1. Use a clean eraser or use cleaning tools made from other materials to gently wipe the lithium battery metal contacts and mobile phone metal contacts, which will improve the charging status and durability of the power supply.
2. Wrap the old lithium battery of the mobile phone that will automatically turn off in plastic wrap and try to wrap it as tightly as possible, with a totall Three layers inside and outside, to make sure the battery is in a vacuum state. Then wrap three layers of newspaper outside the plastic film to completely seal the lithium battery. Place it in the freezer layer of the refrigerator. After 48 hours, remove the battery and remove the six layers of wrapping paper one by one. There is no surface expansion or deformation of the lithium battery due to freezing. After cooling for a while, then charge.
3. Fully discharge the almost discarded lithium battery, then recharge it to activate the battery. The specific method is: deep discharge of the mobile phone is to achieve deeper recharge by exhausting the internal power, which requires unconventional methods.
Use a specific device to connect the cell phone to a small low light bulbtension. The energy inside the battery will be transferred to the small bulb until all the light is emitted. "Cell phones must slowly drain due to lower voltages. Under normal circumstances, if the cell phone is connected and is lower than the rated voltage of 3.6 volts, it will automatically turn off after discharge, the battery of the mobile phone recharged." can be used for a longer time.
The lifespan of lithium batteries is about 600 times. If the charging times are too long, the thermal movement of molecules will gradually destroy the microstructure of the internal molecular arrangement and the charge storage efficiency will gradually decrease. "The freezing process can easily destroy the original internal structure of the battery. It can increase the charging capacity in a short time, but it may not be effective for long-term use," he said.Professor Ye said. The microstructure of the lithium battery is destroyed, it must be completely restored. It is impossible that long-term use of this method will accelerate the loss of cell phone battery.
Regarding the "activation" problem of lithium batteries, many opinions are: the charging time should be more than 12 hours, and full charging and discharging should be repeated three times to activate the battery. This claim that “the first three charges take more than 12 hours” relates to rechargeable batteries from the 1990s. Nickel-cadmium batteries then had a memory effect and had to be fully charged to ensure battery capacity. The mobile phone uses a lithium-ion battery that has no memory effect and can be fully charged in 2-3 hours.
Proper maintenance of lithium batteries
1. Mobile phone batteries are most afraid of high or low temperatures
1. above 100℃
This will seriously affect the battery life and energy storage capacity, and may cause the battery to melt or explode. Therefore, please keep lithium batteries away from fire and other heat sources.
2. High temperature from 35℃ to 100℃
Yes, you read correctly, from 35℃ (human body temperature is generally 36.2℃ to 37.2℃), battery life begins to be affected. Temperature has an obvious impact, and the higher the temperature, the greater the impact.
The rated life of lithium batteries is at least 800 times fully charged and discharged. Based on the average charge of a mobile phone once per day, a battery should last approximately three years. But the vast majority of batteries do notdidn't last as long. This is largely explained by the fact that the battery is affected by the temperature of the human body, and by the heat generated by the other chips of the mobile. phone.
Why do laptop batteries always seem to last less than cell phone batteries? This is because: First, laptops generate much more heat when operating than cell phones, and heat from the computer chip is easily transferred to the battery. easy to exceed 40℃. Second, in order to charge faster, laptops generally have higher charging current and larger battery capacity, and the battery itself generates heat during charging and discharging. Third, the battery is usually located on the bottom panel, making it less likely to dissipate heat.
Also, if yourdevice generates more heat while in use, for example making long calls on your mobile phone, playing large games on your mobile phone or playing games on your laptop, this heat will be conducted to the battery, In addition, the heat generated by the battery itself during charging will not pose a safety risk, but it will also affect the battery.
So if you find that the device is obviously hot while charging (like an iPhone playing 3D games while charging), you might consider waiting until it is fully charged before playing with the charging cable.
3. Below -40 ℃
It will reach the freezing point and freeze completely.
4. Low temperature from 10℃ to -40℃
This will reduce battery life, but will not cause permanent damage to the battery as long as the temperature returns to the roomThis. .
2. Ideal condition of lithium batteries
It is more suitable that the working environment temperature of lithium batteries is around 20 ℃ (almost at 'interior). Temperature). At this time, the battery discharge and charge performance can be maximized. If you want to leave the battery idle for a long time (more than three months), be sure to charge it to about 40% before leaving it idle (forget it for a short time, the key is the problem). For this reason, when the battery leaves the factory, the battery factory charges it to 40% before leaving the factory. The lower the temperature of the unused battery, the slower it will age, but it should not be lower than -40℃.
Proper use of lithium batteries
1. New batteries: No treatment is required, such as activation, etc., and can be used normally. directly.
2. Batteries that have not been left unused for a long time (within three months): do not require any treatment (such as activation, etc.) and can be directly used normally.
3. Batteries left unused for a long time (more than three months) can be activated to bring the battery activity to its highest level, or not allow it to return naturally at its highest activity with normal use.
4. For electronic product evaluators, to ensure accurate battery life statistics, it is necessary to perform activation processing before testing.
The right way to charge your cell phone
Don't worry, charge it whenever you want and you can stop charging at any time no problem. scruples. This is an important advantage of batterieslithium: no memory effect. But don't wait until your phone runs out of power and automatically turns off before recharging it. It is also necessary to carry out a full cycle of discharge and charge at least once a month, that is, use the phone's energy to less than 20%, then charge it up to until it is full. Once it's full, let it charge. some time. In short, just one sentence to summarize: recharge as you go, don't wait for it to run out to recharge, recharge it once a month.
Can lithium batteries be activated if placed in the refrigerator?
Black damage under the battery can be repaired by cleaning the battery and the cell phone. contact points, freeze the battery and replace the battery.
1. Clean the contact points of the battery and the cell phone: use a clean eraser or others cleaning tools to gently wipe the metal contacts of the lithium battery and the metal contacts of the black cell phone. damaged. This helps improve charging conditions and battery durability.
2. Freeze the battery: Wrap the old lithium battery of the cell phone that automatically turns off in plastic wrap. Try to wrap it as tightly as possible, with a total of three layers inside and outside. Keep the battery in a vacuum state. Then wrap three layers of newspaper outside the plastic film to completely seal the lithium battery. Place it in the freezer of the refrigerator. After 48 hours, remove the battery and remove the six layers of wrapping paper. Please note that low temperatures can cause changes in the electrolyte inside lithium batteries and promote chemical reactions.ues in batteries that have just been frozen. The black damage under the cell phone battery will disappear after a while of cooling, try charging.
3. Replace the battery: Black damage under the cell phone battery may be caused by excessive battery usage, quality problems with the battery itself, or external physical damage. a professional repair shop to replace the battery with a new one.
Yes, the method is as follows:
1. Wrap the battery in newspaper, put it in a plastic bag, wrap it and put it in the freezer for three days (newspaper can absorb excess water)
2. After three days, remove it and leave it at room temperature for two days.
3. After two days, charge the battery. is fully charged, install it in a mobile phone package and test it (it is estimated that 80-90%can be saved)