Power lithium battery manufacturers: what is the correct charging method for ion batteries?

What is the correct way to charge an ion battery? How to maintain, the power lithium battery manufacturer will explain to you:

Correct charging method and maintenance method of 18650 lithium-ion battery. The 18650 lithium-ion battery works by storing energy by charging it, then releasing it into other energy and releasing it. Standby when neither charging nor discharging. Therefore, the correct use of lithium-ion batteries mainly includes three aspects: correct charging, correct discharging, and correct maintenance.

Power lithium battery manufacturer: The number 18650 in the 18650 lithium-ion battery represents the appearance size: 18 refers to the battery diameter of 18.0mm, and 650 refers to the battery height of 65.0mm. Common 18650 batteries are divided into lithium batteries , lithium iron phosphate batteries and nickel-metal hydride batteries. The voltage capacity standard is NiMH battery voltage 1.2V, common capacity 2500MAH, lithium battery voltage 3.6V, common capacity 1500MAH-3100MAH.

Correct charging method of 18650 lithium ion battery

1. High voltage charging: There is no special control circuit for this charging method. The battery with the protection board is charged vertically using the 5V power head, which completely relies on the high voltage constraint of the protection board. The characteristic is that the current is very high at the beginning, and then gradually decreases, and it can be floated at any time; most people will fry this kind of thing, which is very common in low-calorie MP3 and so on. I don't understand - I dare not say the words "such an expensive machine should have a charging circuit" - a lot of things "should" and many more things should be done and not done;

2. Constant voltage charging: This method is similar to the previous method. Constant pressure is actually "limiting pressure". Set a relatively accurate and very high voltage, then charge to that voltage. It never stops if it goes below 4.2V. "Silly charging", if this kind of charger makes the cut-off voltage very accurate, it is safe to be too low. If it is too high, you have to rely on the protective plate. At present, the direct charging of mobile phone flashlights is commonly used. The cost of this kind of charger is less than one dollar, and it is made of defective products. The retail price of Taobao ranges from 2.00 to 15.00, and it is difficult to say how long it will last;

3. Constant current charging: This method is derived from the previous circuits, but only limits the high charging current. Constant current and constant voltage are actually "current limiting and voltage limiting". This kind of circuit is more popular, such as Nanfu, Hexinyu, etc., it is not completely cut off after diffusion, and replaced by trickle floating charge - it is currently believed that long-term low-current charging is the cause of flatulence in 18650 lithium-ion batteries. one;

4. Intelligent charging: This is the ideal charging management method. It follows the charging algorithm mentioned at the beginning of this section and is integrated in a small SMD IC. The peripheral circuit is simple, stable and reliable, such as TP4054/4055/4056/4057, TP4002/5000, MAX1879, etc. The main feature of this chip is to judge whether it can monitor voltage and current at the same time. Diffusion or not, stop charging at 4.2V, or stop charging when the charging current is less than 0.01C (usually about 50mA). Charge, but monitor the voltage at any time. If the voltage of the 18650 lithium-ion battery drops to a certain value, start charging.