Lithium electric system

The invention discloses a lithium electric system and a protection circuit suitable for the lithium electric system. Charging mos tube; Discharge mos tube; A master controller for outputting signals for controlling the charging mos tube and the discharging mos tube; A charging controller for controlling the electrical connection of the lithium battery pack and the charger thereof; A load controller for controlling the electrical connection of the lithium battery pack and the load thereof; An analog circuit for detecting a voltage of a gate electrode of the charging mos tube and a gate electrode of the discharging mos tube and a voltage of the current sampling resistor and transmitting a voltage signal to the load controller or the charging controller according to the detected voltage. Theinvention provides a lithium electric system and a protection circuit suitable for the lithium electric system, which can effectively perform power-off protection when a charging and discharging mos transistor fails through a