Principle and Process of Lithium Battery Charging for Mobile Phone

Lithium cell phone battery charging must be completed by charger, mobile phone IC and mobile phone battery.

In general, the charger converts the ordinary voltage(domestic 220V) to 12V/9V/5V and other voltages, and the mobile phone IC converts the 12V/9V/5V voltage to 4.2 V voltage and transmits the electrical energy to the mobile phone battery. Charge.

The charging process of the lithium battery of the mobile phone is controlled by the IC chip and is divided into three phases: low pressure pre-charge phase, constant current charging phase and constant pressure charging phase. Generally, the total time spent is more than 2 hours.

Its specific process is as follows:

First, the voltage of the battery to be recharged is detected. If the battery voltage is less than 3V, the charging current is 1/10 of the set current;

Secondly, when the voltage rises to 3V and is less than 4.2 V, the current is set for constant current charging;

Then, when the battery voltage reaches 4.2 V, the charging voltage of 4.2 V is maintained for constant voltage charging. At this time, the charging current gradually decreases. When the current drops to 1/10 of the set charging current, the charging ends.

In addition, in order to extend the battery life, other charging AIDS will be added during the charging process. These include the use of trickle-down charging, battery voltage detection, input current restrictions, chargers after charging, and automatic recharging mode after partial discharge of the battery.

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