r03 battery.Analysis of the function of laptop battery protection circuit

　　If a laptop lithium battery is overcharged during charging, it may cause the battery to explode. If it is overdischarged, the battery will be damaged. In order to avoid these two states, it is generally necessary to add a protection circuit to the laptop battery, that is, a battery protection circuit board. .

　　Someone asked online: "What kind of work does the laptop battery protection circuit do? The following answers come from electrical professionals.

　　If a laptop lithium battery is overcharged during charging, it may cause the battery to explode. If it is overdischarged, the battery will be damaged. In order to avoid these two states, it is generally necessary to add a protection circuit to the laptop battery, that is, a battery protection circuit board. .

　　What does the battery protection circuit do:

　　Simply put, it is "overcharge protection, over-discharge protection, over-voltage protection, over-current protection, temperature protection, etc."

　　That is, it protects the charging and discharging of the battery to prevent overcharging, over-discharging, excessive charging and discharging current, excessive battery temperature and other charging and discharging states that are harmful to the battery.

　　For details, see image below

　　"Basic architecture of laptop battery protection circuit board

　　First, the battery parameter acquisition circuit collects the battery's charge and discharge current, battery voltage and battery temperature, and sends these parameters to the central controller;

　　The central controller makes judgments based on the preset thresholds of current, voltage and temperature;

　　If the judgment result is the above illegal charging and discharging state, the Mos transistor connected in series with the main circuit is immediately turned off to cut off the charging and discharging circuit, thereby protecting the battery.

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