Crystal silicon solar cell module and cell aggregate for crystal silicon solar cell module

A crystal silicon solar cell module, comprising:

• a solar cell string comprising a plurality of PERC solar cells, each two adjacent ones of the plurality of PERC solar cells being interconnected with each other by shingling;
• each of the plurality of PERC solar cells comprising:
• a single crystal silicon substrate of one conductivity type having a first major surface and a second major surface;
• a diffusion layer of reverse conductivity type that is in contact with the first major surface;
• a first collection electrode that is in contact with the diffusion layer on a side opposite to a side on which the diffusion layer is in contact with the single crystal silicon substrate;
• a first connection electrode that is in contact with the diffusion layer and the first collection electrode;
• an insulation layer that is in contact with the second major surface and has at least one opening portion extending therethrough;
• a second collection electrode that is in contact with the insulation layer on a side opposite to a side on which the insulation layer is in contact with the single crystal silicon substrate, and that is connected to the single crystal silicon substrate via the at least one opening portion;
• and
• a second connection electrode that is in contact with the second collection electrode on a side opposite to a side on which the second collection electrode is in contact with the insulation layer, wherein
• the first connection electrode and the second connection electrode are separated from each other when viewed from a direction substantially perpendicular to the first major surface in the each of the plurality of PERC solar cells,
• the solar cell string has an overlapping area in which the each two adjacent PERC solar cells overlap each other,
• in the overlapping area of the each two adjacent PERC solar cells, the first connection electrode of one of the each two adjacent PERC solar cells and the second connection electrode of the other of the each two adjacent PERC solar cells are connected with each other while overlapping each other when viewed from the direction substantially perpendicular to the first major surface,
• in each of the plurality of PERC solar cells,
• the second collection electrode and the single crystal silicon substrate are separated from each other via the insulation layer in all of the overlapping area or almost all of the overlapping area excluding a part thereof,
• an end edge of the single crystal silicon substrate located on one side, on which side the second connection electrode is arranged in an aligning direction of the PERC solar cells in the solar cell string, has a surface substantially perpendicular to the first major surface, and an inclined surface formed by laser irradiation when the each of the plurality of PERC solar cells is formed, and
• a distance between an end edge on the one side of the second collection electrode and the surface of the single crystal silicon substrate substantially perpendicular to the first major surface is 150% or more of a width in the aligning direction of the inclined surface.