Photovoltaic-storage battery device

DETAILED DESCRIPTION The invention contemplates elimination of the above problems, and its object is to provide a novel composite photovoltaic-storage battery device having a photovoltaic element and a storage battery which can store electric energy from the photovoltaic element, thereby permitting use of low power consumption devices in a dark room without illuminating light, at night, or under the like conditions.
According to the invention, the above object is attained by a photovoltaic-storage battery device which comprises a substrate having a pair of major surfaces, a photovoltaic element provided on one of the major surfaces of the substrate and including a pair of electrodes opposing each other and a photoelectric film interposed between the pair of electrodes; and a storage battery element provided on the other major surface and including a second pair of opposing electrodes electrically connectable to the first-mentioned pair electrodes respectively and an electrolyte intervening between the second pair of electrode.
In a modification of the photovoltaic-storage battery device according to the invention, a photovoltaic element is provided on one major surface of a first sub-substrate while a storage battery element is provided on one major surface of a second sub-substrate, and the other major surfaces of the first and second sub-substrates are bonded together.
In this instance, the photovoltaic element may be formed independently of the storage battery element or vice-versa because the two elements are formed on the separate sub-substrates.
This can alleviate restrictions imposed on fabrication of these elements.
For example, where the two elements are otherwise formed on the opposite major surfaces of the same substrate, one element that is to be formed after the formation of the other element must be formed in atmospheres that will have no adverse thermal or other effects on the other element.