What to do after the lithium battery is heated and expanded?
The expansion of lithium battery, commonly known as bulging, is due to the sudden change of internal chemical substances due to short circuit, super current, puncture short circuit and other reasons of its internal positive and negative chemical materials. The internal gas is generated due to high temperature, and the battery is a highly sealed product. The generated gas cannot be discharged, so the only deformation is the expansion of the shell, More space has been created to store gas. The bottom and both sides of the battery are thicker than the front and back, and the area is small, so the drum is made on the front and back.
This bulging lithium battery is basically unavailable. Its carrying capacity becomes poor. It will be fully charged when traveling, but it will be dead when making a phone call, or it will be used for a short time. It will be charged when it is turned off and then turned on.
There is electrolyte in lithium battery. After repeated discharge, part of the electrolyte decomposes to produce gas, which expands the battery. Lithium batteries with severe expansion should not be used again. Now commercial lithium batteries are basically all electrolyte configured with lithium hexafluorophosphate. As soon as the temperature is high, they begin to decompose, react with the solution and release gases such as carbon dioxide. The lithium salt for developing new electrolyte can not be overcome for the time being. Try not to use it at high temperature for a long time.
What are the reasons for lithium battery expansion?
1. Over discharge and overcharge of lithium battery;
2. Micro short circuit, that is, the diaphragm is damaged, resulting in partial contact between the positive and negative electrodes inside the battery;
3. Continuous floating charge of lithium battery at high temperature leads to side reaction of electrolyte and large rate charge and discharge at high temperature, which will not occur in civil use;
4. Low temperature charging is actually a micro short circuit caused by lithium precipitation piercing the diaphragm;
5. The aluminum plastic film of the outer package is corroded;
6. The vacuum is not clean, or when used in high altitude environment, the mobile phone batteries are soft packaged, which has a great impact.
How to repair the lithium battery after it is heated and swollen?
The lithium battery expands and is scrapped. For safety reasons, it is recommended that the battery be handed over to the recycling company for recycling. Polymer lithium battery will produce gas after a long time, so it will expand. In severe cases, the seal will leak. If you find your battery bulging, for safety reasons, you should stop using it and replace it with a new battery.
Excessive charging and discharging times of lithium battery will cause inflation. At this time, the internal structure of the battery has been damaged, and the standby time will be much shorter. To avoid lithium battery bulging, first develop good use habits, such as using the original charger to charge your favorite machine as much as possible, or an accessory charger approved by the brand.
A long time ago, lithium batteries needed deep discharge and deep charge three times to make the battery give full play to its power, but now the new lithium battery has no memory effect and does not need to be over discharged and overcharged. In addition, there is no need to charge for a long time. After the lithium battery is fully charged, it will automatically stop charging. As long as the battery is charged in time before it is exhausted, do not wait for it to be charged when it is completely powered off, which will lead to over discharge of lithium battery and decrease of lithium battery power.
Three methods of repairing mobile phone lithium battery
1. Use a clean eraser or a cleaning tool of other materials to gently wipe the metal contacts on the lithium battery and the mobile phone, which is helpful to the charging condition and the durability of power.
2. The old mobile phone lithium battery with automatic shutdown shall be firmly wrapped with fresh-keeping film. It shall be taken as close as possible when wrapping. There are three layers inside and outside to ensure that the battery is in a vacuum state. Then, three layers of newspapers are coated outside the plastic wrap to completely seal the lithium battery. Put it into the freezing layer of the refrigerator. After 48 hours, take out the battery and remove the six layers of paper film wrapped one by one. The lithium battery has no surface expansion or deformation due to freezing. After cooling for a period of time, then charge.
3. Completely discharge the lithium battery that is close to being scrapped, and then recharge it to activate the battery. The specific method is: deep discharge the mobile phone, that is, to achieve deeper recharging by depleting the internal power, which requires some unconventional methods. Connect the mobile phone with a low-voltage small bulb with a specific device, and the power inside the battery will be transmitted to the small bulb until all lights are emitted.
The above is the repair method of lithium battery after thermal expansion. Lithium batteries are now widely used. Experts remind that the price of lithium batteries is not too high. Instead of trying to repair lithium batteries, it is more convenient and cost-effective to buy a new battery. In addition, developing good use habits is also a shortcut to prolong the life of lithium batteries.
