Function Explanation：
1. Overdischarge protection: When the battery is about to run out and the voltage reaches the minimum value required, the protection plate will close and cannot be discharged. Therefore, the product will automatically shut down and form a kind of overdischarge protection.
2. Overcharge protection: When charging the product, when the voltage reaches the highest voltage of the battery, the protection plate will automatically turn off, indicating that the battery is full and no longer needs to continue charging,form a kind of overcharge protection.
3. Short circuit protection: when the battery accidentally short circuit, the protection plate will be automatically closed within a few milliseconds, will not be powered on, and form a short circuit protection, it will not cause an explosion.
4. Overcurrent protection: When the battery discharge, the protection plate will have a maximum limiting current, when the discharge power exceeds, the current protection plate will automatically close.