① Charging
The safe operating voltage range for power lithium batteries is 2.8~4.2V. Below or above this voltage range, the lithium ions in the battery become very unstable, potentially causing accidents. To ensure that power lithium-ion batteries operate within this safe range, a dedicated charger is required. These chargers automatically adjust the charging method based on the battery's current state.
②Activate
Before a lithium-ion battery charger starts charging, it supplies a small current to the battery while simultaneously detecting changes in battery voltage, and gradually increases the current until it reaches the set value. This process can be considered an activation or test charging.
③ Constant current transformer charging
The charger charges the lithium-ion battery with a constant current. As the battery voltage increases, the charger simultaneously increases the charging voltage to speed up the charging process.
④ Converter constant voltage charging
When the battery reaches the 4.2V cutoff voltage, it has only been charged to about 70% (not fully charged). At this point, the charger continues to charge the battery with a constant voltage and a gradually decreasing current, stopping charging only when the current is less than 0.1A and the charger detects that the battery voltage is still rising.
⑤ The longer the charging time for a power lithium-ion battery, the better. For ordinary chargers, charging should be stopped immediately after the lithium battery is fully charged; otherwise, the lithium-ion battery will affect its performance due to heat or overheating.
