Common charging methods and storage analysis of lithium batteries

1) High-voltage charging: This charging method has no special control circuit. It uses a 5V power head (or a diode to step down) to charge the battery with a protection board, which is completely dependent on the high-voltage limit of the protection board. The characteristic is that the current is very large at the beginning, then gradually decrease, and float at any time; most of them will blow up this kind, usually in low-end card MP3, etc., high-end can not afford it, I don’t know I dare not say that such an expensive machine should have The charging circuit should do a lot of things, but it should do but not do more; (2) Constant voltage charging: This method is similar to the previous one, the constant voltage is actually a voltage limiter, and a relatively accurate maximum voltage is set. Then it will charge to that voltage. If it is less than 4.2V, the people of the world call it a silly charge. If this kind of charger makes the cut-off voltage very accurate, it will be safe if it is low. If it is too high, you have to rely on the protection board. As for the bare battery, just ask for it. Universal chargers for mobile phones and direct charging of flashlights, which are commonly used today, cost less than a dollar and are all assembled from inferior parts. The retail price of Taobao ranges from 2.00 to 15.00. It is hard to say how long it can be used; ( 3) Constant current charging: This method is still derived from the previous and the previous circuit, but the maximum charging current is limited. Constant current and constant voltage are actually current limiting and voltage limiting. The son of a stupid charger is still a fool. This kind of circuit is more popular, such as Nanfu and Xinyu, which are not completely cut off after overflowing. It is changed to trickle float charging. It is currently believed that long-term low-current charging is one of the reasons for battery flatulence; (4) Smart charging : This is currently considered an ideal charging management method. It follows the charging algorithm mentioned at the beginning of this section and is integrated in a small chip IC. The peripheral circuit is simple, stable and reliable, such as TP4054/4055/4056/4057, TP4002 /5000, MAX1879 and so on. The key feature of this chip is that it monitors the voltage and current at the same time when judging whether it is overflowing. 4.2V stops charging, or the charging current is less than 0.01C (usually about 50mA); it is completely cut off after overflowing, and there is no trickle floating. Charge, but monitor the voltage at any time, if the battery voltage drops to a certain value, then start charging; the preservation of lithium batteries is said to have been specially tested, after a full year of standing for a year, the total capacity of lithium batteries will drop by 20%; and charging To 40% of the total capacity of lithium batteries dropped by only 5% after standing for one year. Lithium batteries that have not been used for a long time can be charged to about 50% and stored at low temperatures (such as refrigerators). The battery itself will have a certain degree of self-leakage, and the protection board will also consume micro-ampere power, so in long-term storage, it is necessary to regularly measure the voltage and recharge it. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: What are the types of batteries for new energy vehicles?