Lithium battery charging requirements Aug 23, 2021

The mainstream charging method for lithium batteries is CC/CV: Constant Current-Constant Voltage. The charging method is constant current first, and then constant voltage charging after reaching a certain potential. A good charger can also be adjusted according to the voltage state of the battery. Current charging, some complex systems also add pulse charging methods in the back, and set the end of charging according to the time.


Chargers generally include AC-DC (AC-DC conversion), charging management modules, mobile phone chargers only have AC-DC modules, etc. The term is called adapter (Adapter), and the charging management module is concentrated on the mobile phone motherboard. And like electric bicycles, electric car chargers generally integrate adapters and charge management.


(Source: JNGEPOWE)

For example, like an ordinary lithium cobalt oxide battery, it detects that the battery voltage is lower than 3.0V, and the charger starts trickle charging (about 0.1CC) to avoid damage to the battery. When the battery voltage reaches 3.0V, it changes to constant current ( CC) Charging (about 0.5C, the current size depends on the system), when the battery voltage is detected to 4.2V, it is converted to constant voltage (CV) charging, when the battery current drops to about 0.1CC, the charging ends, and the charging system and charging circuit are closed. . Trickle first, then constant current and finally constant voltage. Of course, ordinary chargers do not have trickle charging.

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