Patent ID: 9024174
Filing Date: 2015-05-05
Classification: H01L,H05K,Y02E

Abstract:
1. A solar cell module, comprising: two solar cells, each including: a photoelectric conversion part, wherein: a first electrode formed of silver paste, comprising thin finger electrodes and a first bus bar electrode that interconnects the finger electrodes that is provided on the first main face; and a second electrode comprising thin finger electrodes and a second bus bar electrode that interconnects the finger electrodes that is provided on any one of the first and second main faces and that has a polarity opposite to that of the first electrode; a wiring member parallel to and laterally overlapping the first bus bar electrode for electrically connecting the first electrode of one solar cell of the two solar cells to the second bus bar electrode of the other solar cell; and a connection layer that is provided between the first bus bar electrode-and the wiring member and that is made of resin including a plurality of conductive particles having average particle diameters from about 6 microns to about 15 microns and suitable for completely bridging imperfections in the two contact surfaces, wherein: the surface of the wiring member having a contact with the connection layer is softer than the conductive particles, wherein: the first bus bar electrode is overlapped by the wiring member and is electrically connected to the wiring member by the conductive particles, a surface of the first bus bar electrode having a contact with the connection layer and a concavo-convex shape that provides a space for the connection layer, and among the plurality of conductive particles included in the connection layer, multiple conductive particles in concave sections at the surface of the first electrode protrude to the wiring member to have a height higher than the top of a surrounding convex sections, wherein each of the multiple conductive particles contacts both the first electrode and the wiring member, wherein in a range of 1 mm of the surface of the first electrode appearing in a cutting plane perpendicular to the surface of the first electrode, a value obtained by dividing an average particle diameter of the conductive particles determined by an average value of a major axis of the conductive particles by a surface roughness of the first electrode determined by a ten points average height is within a range of 0.5 or more and 1.2 or less.