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2. Overcharging maintenance

As a rechargeable battery, lithium-ion batteries require constant current/constant voltage charging. At the initial stage of charging, constant current charging is required. During the charging process, the charging voltage will rise to 4.2v (depending on the cathode material, some batteries require a constant voltage value of 4.1v), and then change to constant voltage charging until the current becomes smaller and smaller. During the charging process, if the charger circuit loses control and the battery voltage exceeds 4.2v, it will continue to charge at constant current. At this point, the battery voltage will continue to rise. When the charging voltage of the battery exceeds 4.3v, it will exacerbate the chemical side reactions of the battery, leading to battery damage or safety issues.

In the battery maintenance circuit, when the control integrated circuit detects a battery voltage of 4.28V (the selected value is the operation of the integrated circuit, and different integrated circuits have different values), the company's pin conducts from high voltage zero voltage, V2 to off, and then cuts off the charging circuit. The charger can no longer charge the battery, resulting in effective charging and maintenance. Now, thanks to V2's own diode VD2, the battery can release external loads through it.

There is also a delay time between the battery voltage detected by the control IC of 4.28v and the declared closed V2 signal. The delay time is selected by C3 and is generally set to around 1 second to prevent misjudgment due to interference.

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