Analyze the new functions of lithium battery maintenance IC

New functions of lithium battery maintenance IC In addition to the above lithium battery maintenance IC functions, the following new functions are also worthy of attention: 1. Overcurrent maintenance during charging When the charger is switched on for charging, overcurrent suddenly occurs (such as the charger is damaged), The circuit immediately performs over-current detection. At this time, Cout will change from high to low, and the power MOSFET will be switched from on to off to realize the maintenance function. V-u003dI*Rds(on)*2 (I is the charging current; Vdet4, the overcurrent detection voltage, Vdet4 is -0.1v) 2. Some forms of overcharging are generally maintained. The IC will pass a period of time during overcharge maintenance. Delay, and then plug the power MOSFET for maintenance purposes. When the voltage of the lithium battery drops to the duty-free point (overload hysteresis voltage), it will be restored, and the current will continue to charge and maintain → → discharge → → discharge. In this case, the safety problem cannot be effectively solved. Lithium batteries are always used for repeated charging, discharging, charging and discharging, and the power MOSFET at the door repeatedly replaces the bump voltage with the state, which may make the MOSFET heat and can reduce the battery. Lifespan, so it is important to determine the form. Assuming that the lithium maintenance circuit determines the form when the overcharge maintenance is detected, the MOSFET will not generate heat, and the safety is relatively improved. After overcharge maintenance, as long as the charger is connected to the battery pack, it will enter the overcharge mode. At present, even if the voltage of the lithium battery drops, it will not be recharged. Charging and discharging can be restored by removing the charger and connecting the load. 3. Reduce the scale of maintenance circuit components. Integrate delay capacitors used for overcharge and short-circuit maintenance into the maintenance IC to reduce the size of maintenance components. Disclaimer: Some pictures and content of articles published on this site are from the Internet. If there is any infringement, please contact to delete.