At present, most of the lithium batteries used in many small devices are 18650 batteries, resulting in fierce competition. The performance of lithium batteries produced by some manufacturers is not very good, and they often face equipment failures. So what are the recovery methods for 18650 lithium battery after equipment failure?

1. The recovery method of 18650 battery with rust on the outer layer: the metal surface of the battery selected for a long time will be greatly oxidized, which will cause the rust of the lithium battery electrode, which makes the lithium battery and the electrical equipment lead not contact well, and the battery life Make it shorter, and use rubber palm or some cleaning products to erase the rusty material on the outer layer, which can reduce the electrical resistance of the circuit system and increase the conductivity.

2. Recovery of 18650 battery by hot and cold alternate method: low temperature can change the lithium phosphate in the battery, and the thermochemical reaction of the lithium battery that has just begun to freeze will occur. The battery selection stage is actually a lithium battery charging stage. During this period, the negative and positive charges in the 18650 lithium battery collided with each other. The reason why lithium batteries are becoming less and less useful is that at normal room temperature, the kinetic energy in the electrons is very large, so the lithium batteries are in an active state, and the leakage of electricity is too frequent. When the battery is placed in a low temperature environment, the microstructure of the lithium film and lithium phosphate on the outer layer of the battery, including their boundary layer, will change significantly, resulting in temporary inactivity in the lithium battery and reduced short-circuit current. Therefore, after recharging, the number of battery cycles can recover greatly.

The cycle life of 18650 battery is about 600 times. If the number of charging is increased, the thermal movement of the molecules will gradually destroy the molecular arrangement and microstructure inside, and the storage charge efficiency will gradually decrease. And “the freezing stage is easy to damage the original internal structure of the lithium battery, and it may increase the ability to charge the charge in a short time, but long-term selection may not be effective. Once the microstructure in the 18650 battery is damaged, it is unrealistic to restore it. , Long-term selection of this method will accelerate the damage of the lithium battery.

3. Intensive discharge method to restore the lithium battery: start the intensity discharge of the mobile phone, but smoothly use up the energy inside to recharge the battery in a more profound situation, which requires the use of some controllable methods. Find a way to connect the 18650 lithium battery to a small 1.5V light bulb, the electric energy in the battery will be sent to the light bulb, and wait until it is all discharged. Lithium batteries need to pass the lower voltage smoothly and consume energy little by little. After the battery is discharged, the recharged lithium power can be selected for a longer period of time.

4. The method of high-voltage charging to restore the lithium battery: charge the battery with a high-voltage battery charging cable (5V, 300MA) for 5 minutes, the charging cable can be a fast charging charger, a charging head, but you cannot use a Wanneng charging cable, mainly wan Recognize the voltage of the charging cable. After five minutes, test the battery voltage V again. If the voltage rises to 1V, continue charging (test the voltage every 5 minutes). Charge it to 3V, sorry! Your lithium battery can be charged with wan energy. Wanneng will recognize your lithium battery when charging.

When you pass these methods smoothly, even if your lithium battery fails to recover a great selection effect, it will be difficult. The 18650 battery has already been irreversibly damaged, so just change the battery directly. Deflagration or explosion of polymer batteries can also cause it. The Samsung mobile phone battery explosion triggered a few years ago and the speculation triggered just this year that General Motors recalled laptops due to insufficient polymer batteries are the same.

4. Current intensity

The general 18650 battery capacity can maintain about 2200mAh. According to statistics like this, the current intensity is about 500Wh/L, while the current output of polymer batteries will be nearly 600Wh/L.

5. Voltage and current of polymer battery

Therefore, polymer batteries use polymer materials, and many layers can be combined to meet high voltage in polymer batteries. The nominal capacity of lithium battery cells is 3.6V. In order to meet the high voltage in the actual combination, a lot of requirements are required. Only polymer batteries connected in parallel can form an ideal high-voltage work management system.

It can be seen from this, which is better, polymer or polymer battery, as if polymer has the characteristic. But some are appropriate, and they must have irreplaceable aspects in different places.

Let us all look at a series:

6. Price

Generally, polymers of the same energy are more expensive than polymer batteries. But it cannot be said that this is a disadvantage of polymers.

At present, in the field of consumer electronics, such as notebooks and mobile power supplies, more and more polymers are used to replace polymer batteries.

In a small polymer battery compartment, to meet the relatively large current intensity in a limited space, polymers are still used. Because of the fixed shape of the polymer battery, it cannot be customized according to the customer’s design.

However, there is no uniform standard size for polymer batteries, which in turn has become a disadvantage in some places. For Tesla Motors, the polymer battery used is composed of more than 7000 18650 sections in series and parallel, plus a power control system.

It seems that polymer or polymer battery is better, which one is better or worse, it depends on the specific situation, and it is impossible to give a single conclusion.