Detailed explanation of lithium battery over-discharge, over-charge, and short-circuit protection circuits

by:CTECHi     2021-07-10

The above circuit diagram is mainly composed of lithium battery protection special integrated circuit DW01, charge and discharge control MOSFET1 (contains two N-channel MOSFETs) and other parts. The single lithium battery is connected to B+ and B Between -, the battery pack outputs voltage from P+ and P-. When charging, the charger output voltage is connected between P+ and P-, and the current flows from P+ to B+ and B- of the single battery, and then to P- through the charging control MOSFET. During the charging process, when the voltage of the single battery exceeds 4.35V, the OC pin of the dedicated integrated circuit DW01 outputs a signal to turn off the charging control MOSFET, and the lithium battery immediately stops charging, thereby preventing the lithium battery from being damaged by overcharging. During the discharge process, when the voltage of the single battery drops to 2.30V, the OD pin of DW01 outputs a signal to turn off the discharge control MOSFET, and the lithium battery immediately stops discharging, thereby preventing the lithium battery from being damaged due to overdischarge. The CS pin of DW01 is When the output of the current detection pin is short-circuited, the on-voltage drop of the charge and discharge control MOSFET increases sharply, the voltage of the CS pin rises rapidly, and the DW01 output signal makes the charge and discharge control MOSFET turn off quickly, thereby realizing over-current or short-circuit protection.

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