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3. Excessive discharge maintenance

During the discharge process, the voltage of the battery will gradually decrease with the discharge process. When the battery voltage drops to 2.5V, its capacity has been fully released. At this point, it is assumed that the battery will continue to discharge, which will cause permanent damage to the battery.

During the battery discharge process, when the control IC detects that the battery voltage is below 2.3V, the selected value is the operation of the integrated circuit (different integrated circuits have different values), the pin is made to conduct from high voltage zero voltage V1 to closed, and then cut off the discharge circuit. The battery can no longer maintain the impact of discharge load discharge. Now, due to the body diode VD1 of V1 itself, the charger can charge the battery through the diode.

Due to the fact that the battery voltage cannot decrease further during over discharge maintenance, the current consumption requirement for maintaining the circuit is very small. At this point, the control IC will enter a low-power state, and the power consumption of the entire maintenance circuit will be less than 0.11a.

When the control IC detects that the battery voltage is below 2.3v and declares the V1 signal to be off, there is also a delay time. The delay time is selected by C3 and is generally set to around 100ms to prevent misjudgment due to interference.

4. Overcurrent maintenance

Due to the chemical characteristics of lithium-ion batteries, battery manufacturers stipulate that the maximum discharge current of lithium-ion batteries cannot exceed 2C (C=battery capacity/hour). When the battery discharge exceeds 2C, permanent damage or safety issues may occur.

During the normal load discharge process of cells, a series of discharge currents after two MOSFETs are stimulated by MOSFETs, and the impedance will attack the voltage at both ends. The voltage U=I * RDS * 2, and RDS is stimulated by one MOSFET. The impedance controls the voltage value of the V-pin test of the IC. If the load is abnormal due to some reason, causing the circuit current to increase. When the ocean current gives U>0.1V (the selected value is for integrated circuit operation, and different ICs have different values), the pin will switch from high voltage to zero voltage, Turn V1 from on to off, then cut off the discharge circuit to zero the current in the circuit, achieving the effect of maintaining overcurrent.

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