Modular device combining photovoltaic cells and energy storage device

The invention relates to the field of generation technologies based on solar photovoltaic cells and energy storage of energy storage devices, and specifically relates to a modular device combining photovoltaic cells and an energy storage device. The modular device combining photovoltaic cells and an energy storage device comprises a photovoltaic cell unit, a first direct-current conversion circuit, an energy storage unit, a remaining energy detection circuit, a second direct-current conversion circuit, a switching circuit, a central processor, and a data bus. When a photovoltaic cell assembly or an energy storage element is in an abnormal operation state, the photovoltaic cell assembly or the energy storage element only affects the control scheme and operation state of the modular device where the photovoltaic cell assembly or the energy storage element is disposed, and does not affect the control and operation of other modular devices. Therefore, the security and reliability of overall operation are improved.