Lithium battery protection board design and maintenance knowledge

Lithium battery protection board design overhaul Because the objective defects of the lithium battery itself hinder the use of lithium batteries, the function of the lithium battery protection board is to make up for some of the defects of the lithium battery. Because the material of the lithium battery itself determines that it cannot be overcharged, over-discharged, over-current, short-circuited, and ultra-high temperature charge and discharge, it is necessary to use a battery protection board to prevent protection. The design functions of the lithium battery protection board include: 1. Overcharge detection voltage: In the normal state, when the CO terminal changes from a high level to a low level, Vdd gradually increases to the voltage between Vdd-vss. 2. Overcharge and discharge voltage: In the charging state, Vdd gradually decreases to the voltage between the CO terminal Vdd-vss, from low to high. 3. Overdischarge detection voltage: Under normal circumstances, Vdd gradually decreases to the voltage between Vdd-vss at the DO terminal, from high level to low level. 4. Discharge voltage: In the over-discharge state, Vdd gradually rises to the voltage between Vdd-vss at the DO terminal, from low to high. 5. Overcurrent 1. Check voltage: Under normal conditions, VM gradually rises to DO, from high level to low level, and then to the voltage between VM-vss. 6. Overcurrent 2. Detected voltage: Under normal circumstances, VM rises from OV to DO terminal, the speed is greater than 1ms, less than 4ms, VM-vss changes from high level to low level. 7. Load short-circuit detection voltage: Under normal conditions, VM rises from high level to low level at a speed of 1S above ovs and 50S below ovs as terminals. 8. Charger detection voltage: In the over-discharge state, the voltage between vm-vss gradually decreases from low level to high level, and gradually decreases from OV to DO. 9. Current consumption during normal operation: Under normal conditions, the current of the VDD terminal (IDD) is the current consumption during normal operation. 10. Overdischarge current consumption: In the discharge state, the current (IDD) flowing through the VDD pin is the overdischarge current consumption. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete. Previous: Common faults and troubleshooting methods for lithium batteries