Photovoltaic cell for the mwt type for dedicated conductive backsheet

Back-contact photovoltaic cell of crystalline silicon of the type called Metal Wrap Through or MWT, for a dedicated conductive backsheet, said cell being intended to be supported and electrically contacted only on the back face by means of said conductive backsheet which, acting as a support and back completion of a photovoltaic panel with a back-contact architecture comprising multiple cells, integrates on the face facing the cells a contacting conductive layer which is intended to electrically connect the N through-holes and the back contacting P points of said cells, called N holes and P points respectively, in such a way as to complete the electrical circuit of said photovoltaic panel up to the contacting blocks of the junction box;

• said cell being of square configuration and having a width of 156 mm with a tolerance of +/− 0.5 mm;
• said cell having said N holes aligned along 4 parallel rows called N rows and said P points aligned along 3 parallel rows called P rows, wherein said P rows are interposed to said N rows with the second P row positioned centrally like a centre line of said back face of the cell;
• said N rows and P rows being in their turn parallel to each other;
• said cell being characterised in that it has said back face having said N rows formed by 6 N holes each, for a total of 24 N holes, and having said P rows formed by 5 P points each, for a total of 15 P points, wherein the centre-to-centre distance between said N rows is constant and is of 38.5 mm, there remaining a space from the side edge which is complementary and symmetrical with respect to the opposite edge, that is to say, it is of 20.25 mm, and wherein the centre-to-centre distance between said P rows P is constant and is of 44.7 mm, there remaining a space from the side edge which is complementary and symmetrical with respect to the opposite edge, that is to say, it is of 33.3 mm, with said values having a tolerance of +/− 5%;
• said P points of each P row being offset in an alternate way with respect to said N holes or with the centre-to-centre distance on the centre line;
• said N holes of each N row having a centre-to-centre distance which is constant and is of 25.5 mm, there remaining a space from the side edge which is complementary and symmetrical with respect to the opposite edge, that is to say, it is of 14.25 mm, with said values having a tolerance of +/−5%;
• said P points of each P row having a centre-to-centre distance which is constant and is of 25.5 mm, there remaining a space from the side edge which is symmetrically complementary, that is to say, it is of 27 mm, with said values having a tolerance of +/− 5%;
• and wherein said N holes have a diameter between 80 micrometres and 220 micrometres, while said P points are circular, with a diameter between 1 mm and 4 mm.