-Charging method and lifespan of 18650 lithium batteries

Charging method and lifespan of 18650 lithium batteries
author:enerbyte source:本站 click211 Release date: 2023-09-01 09:27:46
abstract:
The battery itself will have a certain amount of self leakage, and the protective board will also have a microampere level of power consumption. Therefore, in long-term storage, it is necessary to regularly measure the voltage and recharge. 1、 Constant current charging: Thi...

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The battery itself will have a certain amount of self leakage, and the protective board will also have a microampere level of power consumption. Therefore, in long-term storage, it is necessary to regularly measure the voltage and recharge.

1、 Constant current charging: This method still originates from the previous and previous circuits, but it limits the high charging current. Constant current and constant voltage are actually current and voltage limiting. This type of circuit is more popular, such as the current of Nanfu and Xinyu. After being fully charged, it does not completely cut off and instead uses trickle floating charging; It is now believed that prolonged low current charging is one of the reasons for battery bloating.

2、 High voltage charging: This charging method does not have a dedicated control circuit, and directly uses a 5V power head (or a diode in series to reduce voltage) to charge the battery with a protective board, completely relying on the high voltage limit of the protective board. The characteristic is that the current is high at the beginning, then gradually decreases and floats at any time.

3、 Intelligent charging: This is currently considered an ideal charging management method, following the charging algorithm mentioned at the beginning of this section, integrated into a small chip IC, with simple peripheral circuits and stable reliability, such as TP4054/4055/4056/4057, TP4002/5000, MAX1879, and so on. The important feature of this chip is that it will simultaneously monitor voltage and current when determining whether it is fully charged, and stop charging, or stop charging when the charging current is less than (usually around 50mA); Completely cut off after being fully charged, without trickle float charging, but monitor the voltage at any time. If the battery voltage drops to a certain value, start charging.

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