How to repair 18650 lithium battery
The 18650 battery life theory is cyclic charging 1000 times. Due to the large capacity per unit density, most of them are used in laptop batteries. In addition, the stability of the 18650 is very good at work. It is widely used in various electronic fields: it is often used in high-end glare flashlights. Power, wireless data transmitters, electric warm clothing, shoes, portable instrumentation, portable lighting equipment, portable printers, industrial equipment, medical equipment, etc.
The 18650 means 18 mm in diameter and 65 mm in length. The model number of the No. 5 battery is 14,500, 14 mm in diameter and 50 mm in length. Generally, the 18650 battery is used in the industry, and there are few civilians. The common ones are used in laptop batteries and high-end flashlights.
The 18650 is just the size of the battery. It can be divided according to the type of battery. 18650 for lithium ion, 18650 for lithium iron phosphate, 18650 for nickel hydrogen (rare), and the common 18650 is lithium ion.
Charge and discharge principle:
The working principle of lithium-ion battery refers to its charging and discharging principle. When the battery is charged, lithium ions are generated on the positive electrode of the battery, and the generated lithium ions move to the negative electrode through the electrolyte. The carbon as the negative electrode has a layered structure, and it has many micropores. The lithium ions reaching the negative electrode are embedded in the micropores of the carbon layer, and the more lithium ions are embedded, the higher the charging capacity.
By the same token, when the battery is discharged (ie, the process we use the battery), the lithium ions embedded in the carbon layer of the negative electrode come out and move back to the positive electrode. The more lithium ions return to the positive electrode, the higher the discharge capacity. What we usually call battery capacity refers to the discharge capacity.
It is not difficult to see that during the charging and discharging process of a lithium ion battery, lithium ions are in a state of motion from a positive electrode to a negative electrode to a positive electrode. If we compare the lithium-ion battery to a rocking chair, the two ends of the rocking chair are the two poles of the battery, and the lithium ion is like an excellent sportsman, running back and forth at both ends of the rocking chair. Therefore, the experts gave the lithium-ion battery a cute name rocking chair battery.
18650 lithium battery repair method principle:
Principle of lithium battery repair method 1: The metal surface of the lithium battery used for a long time will have a certain degree of oxidation, resulting in poor contact between the mobile phone battery and the mobile phone. The lithium battery is used for a shorter period of time, and can be wiped with a rubber plaque or other cleaning tool. In addition to the rusting substances on the surface, the battery and the mobile phone become better.
The principle of lithium battery repair method 2: low temperature can change the electrolyte inside the lithium battery, and promote the chemical reaction of the battery just frozen. The use of lithium batteries is actually a charging and discharging process. During this period, the negative and positive charges in the battery collide with each other. The reason why the battery is becoming more and more useless is because under normal room temperature, the internal kinetic energy of the electron is relatively large, so the battery is in an active state and the leakage is relatively frequent. When the lithium battery is placed in a low temperature environment, the lithium film on the surface of the lithium battery and the microstructure of the electrolyte, and their interface will change significantly, resulting in a temporary inactivity of the battery and a decrease in leakage current. Therefore, after recharging, the waiting time of the mobile phone will increase.
The lithium battery has a cycle life of about 600 times. If the number of times of charging is increased, the thermal motion of the molecule will gradually destroy the internal molecular arrangement microstructure, and the storage charge efficiency will gradually decrease. "The process of freezing easily destroys the original internal structure of the battery, and may increase the capacity to charge the charge in a short period of time, but long-term use may not be effective." Once the microstructure of the lithium battery is destroyed, it is impossible to completely recover it. Long-term use of this method will accelerate the loss of mobile phone batteries.
The principle of the lithium battery repair method three: deep discharge of the mobile phone, is to exhaust the internal power to achieve a deeper degree of recharging, which requires some unconventional methods. Try to connect the phone to a 1.5V small light bulb, and the internal power of the lithium battery will be transferred to the small light bulb until it is all light. “The mobile phone needs to slowly run out of power through a lower voltage. Under normal circumstances, if the mobile phone is connected to a rated voltage lower than 3.6 volts, it will automatically shut down.” After the battery is discharged, the rechargeable battery can be used again. Long time.
18650 lithium battery repair method:
1. Take all your batteries and use them after temperature treatment. The battery will greatly shorten the use time when the temperature is unstable, because the battery is not charged and a considerable part of the lithium ions have been used for memory. This method can release a part of the memory, winter is over, put it outside for a while, then get it inside.
2, there is a way to remove the battery, put it for about a week, the electricity will be slowly consumed, you need to use the machine to completely consume the electricity. Then fully rush, it is estimated that your current charging time must be very short, after the full, disconnected and rushed, repeated several times, absolutely effective.