The invention discloses a micro-source battery pack, which comprises a plurality of power storage modules, a control module, an isolation diode, a second power source point, a power source input point, a power source output point, and a public place. Each of the power storage modules comprises an input node, an output node, a fuse, a second resistor, a first resistor, a first capacitor, a first inductor, a first diode, a second capacitor, a second diode, a third diode, a number zero sampling resistor, a number one sampling resistor, a switch, a rechargeable battery, a power source place, a single-chip microcomputer, a bootstrap node, a sampling node, and an optical coupler. The mini-sized photovoltaic inverter device having the safety control function is provided with the above mentioned micro-source battery pack. According to the invention, the costs are low, the application is flexible, the service lifetime is long, the breaking is not easy to occur, and the use is stable and reliable; whether the open circuit of the diode, the anode of which is connected with the high voltage pole of the DC power source, exists can be detected by adopting the electric energy test in the running state of the DC power source, and the open circuit of the fuse can be detected by the bypass in a real-time and reliable manner.