In view of such flaws as the fluctuation of the output of photovoltaic power system due to the instability of the light energy in the photovoltaic system, a proposal has been made of using the battery as the energy supplement. The peaked load shifting of the output power of photovoltaic cells helps to stabilize the output power quality. Based on event-driven strategy, this method sets the voltage threshold to drive the battery to operate in 3 modes: charging, discharging, and stopping. Finally, the model of photovoltaic cell and battery is to be established by using the simulation software, with an event-driven controller designed on this basis as well. A simulation of the proposed scheme has been carried out based on the combination of the model and the controller. The simulation results show that this method helps to stabilize the voltage, and reduce the charge and discharge times of the battery, which is conducive to prolonging the service life of the battery.