| 摘要 |
PURPOSE:To prevent the concentration of an electric field between a back material and a frame body even when a high voltage is impressed on an electrode and the frame body and thereby to enable the attainment of high insulative voltage resistance, by forming four corners of the back material in the shape of a smooth curve and by increasing a distance of insulation from the frame body. CONSTITUTION:A back material 3 for protecting the back of a solar cell element has a three-layer structure in which an aluminum sheet 3b of a second layer for resisting humidity permeation is held on the opposite sides between Tedlar film 3a of first and second layers for attaining insulative voltage resistance. Numeral 4 denotes a packing material provided between an upper transparent material 2 and the back material 3 so as to fix these material to the solar cell element. The structure of the bck material 3 including aluminum 10 prevents the concentration of electric lines of force on the back material 3 side, thus preventing the concentration of an electric field substantially. A solar cell module of this invention the back material 3 of which is formed in such a shape as stated above has a high insulation characteristic. |
