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The Working Principle of Li-ion Battery Protection Board
2022-03-10
The battery protection board generally consists of an integrated circuit board which protects the battery from charging and discharging. Because the material of Li-ion battery itself decides that it cannot be overcharged, discharged, short-circuited and charged and discharged at ultra-high temperature, Li-ion battery generally needs a special protection board to protect the battery
Protector usually includes control IC, MOS switch, JEPSUN, JES, precision resistor and auxiliary equipment NTC, ID memory, PCB and other control IC, control MOS on, and external circuit communication, while the battery voltage or battery voltage circuit current exceeds a predetermined value, it immediately (tens of milliseconds) to control MOS switch. Protect the safety of the battery.
The normal working process of Li-ion battery protection board is: when the cell voltage is between 2.5V and 4.3V, the first and third pin of DW01 both output high level (equal to the supply voltage) and the second pin voltage is 0V. At this time, the voltage of pin 1 and pin 3 of DW01 will be assigned to pin 5 and pin 4 of 8205A respectively. The two electronic switches in the 8205A are on because their G poles are connected to the voltage from DW01, i.e. both electronic switches are off. At this point the negative terminal of the battery is connected directly to the P- terminal of the protection board, which has a voltage output.
Effects.
1. voltage protection: overcharge, overdischarge
2. current protection: mainly reflected in the operating current and overcurrent disconnect switch MOS to protect the battery pack or load.
3. short-circuit protection: strictly speaking, it is a voltage comparison type of protection, i.e., direct shutdown or voltage comparison drive without additional processing.
4. temperature protection: generally used in smart batteries, is also essential.
5. MOS protection: mainly MOS voltage, current and temperature.
6. self-consumption: the smaller this parameter the better, the most ideal state is zero, but this is impossible to do.
7. equalization: the most common equalization methods are divided into two types, one is energy-consuming, and one is energy transfer type.
Protector usually includes control IC, MOS switch, JEPSUN, JES, precision resistor and auxiliary equipment NTC, ID memory, PCB and other control IC, control MOS on, and external circuit communication, while the battery voltage or battery voltage circuit current exceeds a predetermined value, it immediately (tens of milliseconds) to control MOS switch. Protect the safety of the battery.
The normal working process of Li-ion battery protection board is: when the cell voltage is between 2.5V and 4.3V, the first and third pin of DW01 both output high level (equal to the supply voltage) and the second pin voltage is 0V. At this time, the voltage of pin 1 and pin 3 of DW01 will be assigned to pin 5 and pin 4 of 8205A respectively. The two electronic switches in the 8205A are on because their G poles are connected to the voltage from DW01, i.e. both electronic switches are off. At this point the negative terminal of the battery is connected directly to the P- terminal of the protection board, which has a voltage output.
Effects.
1. voltage protection: overcharge, overdischarge
2. current protection: mainly reflected in the operating current and overcurrent disconnect switch MOS to protect the battery pack or load.
3. short-circuit protection: strictly speaking, it is a voltage comparison type of protection, i.e., direct shutdown or voltage comparison drive without additional processing.
4. temperature protection: generally used in smart batteries, is also essential.
5. MOS protection: mainly MOS voltage, current and temperature.
6. self-consumption: the smaller this parameter the better, the most ideal state is zero, but this is impossible to do.
7. equalization: the most common equalization methods are divided into two types, one is energy-consuming, and one is energy transfer type.
