The overcharge protection mechanism of the charger is a key function to ensure that the battery is not overcharged during the charging process.Overcharging refers to continuing to charge a battery when its voltage reaches or exceeds its rated voltage,which can cause excessive pressure inside the battery,potentially leading to potential hazards such as battery expansion,leakage,and even explosion.To prevent this from happening,modern battery chargers are generally equipped with overcharge protection mechanisms.Next,we will provide a detailed explanation of how the overcharge protection mechanism works.

　　Firstly,the overcharge protection mechanism of the charger prevents overcharging by monitoring the voltage of the battery.When the battery is charging,the charger will measure the voltage of the battery in real time.Different types of batteries have different rated voltages,with lithium batteries typically having a maximum cell voltage of 4.2V,while lead-acid batteries typically have a maximum cell voltage of 2V.The overcharge protection mechanism of the charger will set a voltage threshold.When the battery voltage approaches or reaches this threshold,the charger will automatically stop charging to prevent the battery from continuing to receive current and avoid overcharging.

　　For lithium batteries,the overcharge protection mechanism usually adopts constant voltage charging.When the battery voltage approaches the upper limit set by the charger(such as 4.2V),the charger will switch to constant voltage mode,and the current will gradually decrease until the battery is fully charged,at which point the charger will stop providing current.If the charger detects that the battery voltage exceeds the set upper limit,it will cut off the charging current and issue an alarm signal through the intelligent control system to alert the user that the battery may have malfunctioned.Lithium ion battery chargers are usually equipped with voltage monitoring circuits and temperature monitoring systems inside.Once the battery temperature rises abnormally,it will immediately stop charging to ensure that the battery will not be dangerous due to overcharging.