The correct charging method for 18650 batteries.
What is the correct charging method for lithium-ion batteries? The manufacturer will explain to you:
The correct charging and maintenance methods for 18650 lithium-ion batteries. The working principle of 18650 lithium-ion batteries is to store energy through charging, and then release it into other energy and release it. When neither charging nor discharging, it is in a idle state. Therefore, the correct use of lithium-ion batteries mainly includes three aspects: correct charging, correct discharging, and correct maintenance.
The correct charging method for
18650 lithium-ion batteries
1. High voltage charging: This charging method does not have a dedicated control circuit. The battery with a protective board is charged vertically using a 5V power head, relying entirely on the high voltage constraint of the protective board. The characteristic is that the current is initially high, then gradually decreases, and can float at any time; Most people will stir up this kind of thing, which is very common in low calorie MP3 players, etc. I don't understand - I dare not say words like 'such an expensive machine should have a charging circuit' - many things' should 'be done, and there are more things that should be done but not done;
2. Constant voltage charging: This method is similar to the previous one. Constant pressure is actually 'limiting pressure'. Set a relatively accurate and very high voltage, and then charge to that voltage. If it falls below 4.2V, it will never stop. Stupid charging ", if this charger makes the cut-off voltage very accurate, it is safe if it is too low. If it's too high, you'll have to rely on a protective board. At present, direct charging is commonly used for mobile phone flashlights, which costs less than one dollar and is made of defective products. The retail price on Taobao ranges from 2.00 to 15.00, and it's hard to say how long it will last;
3. Constant current charging: This method is still derived from previous circuits, but it limits the high charging current. Constant current and constant voltage are actually "limiting current and voltage". This type of circuit is quite popular, such as Nanfu and Xinyu. After diffusion, it is not completely cut off, and instead, trickle float charging is used - it is currently believed that long-term low current charging is the reason for the swelling of 18650 lithium-ion batteries. One;
4. Intelligent charging: This is the ideal way to manage charging. It follows the charging algorithm mentioned at the beginning of this section and is integrated into 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 determine whether voltage and current can be monitored simultaneously. Whether it diffuses or not, stop charging at 4.2V or when the charging current is less than 0.01C (usually around 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 again.
