Conductor connection member, connection structure, and solar cell module

Abstract

The electric conductor connecting member of this invention comprises a metal foil having a roughened surface on at least one main side, and an adhesive layer formed on the roughened surface of the metal foil.

1 . An electric conductor connecting member comprising a metal foil having a roughened surface on at least one main side, and an adhesive layer formed on the roughened surface of the metal foil. 
     
     
         2 . An electric conductor connecting member according to  claim 1 , wherein the thickness t (μm) of the adhesive layer is no greater than 3 times Ry, where Ry (μm) is the maximum height of the roughened surface on which the adhesive layer has been formed. 
     
     
         3 . An electric conductor connecting member according to  claim 1 , wherein the adhesive layer comprises a latent curing agent. 
     
     
         4 . An electric conductor connecting member according to  claim 1 , wherein the adhesive layer comprises conductive particles. 
     
     
         5 . An electric conductor connecting member according to  claim 1 , wherein
 the adhesive layer comprises conductive particles, and   the mean particle size D (μm) of the conductive particles is no greater than Ry, where Ry (μm) is the maximum height on the roughened surface on which the adhesive layer has been formed.   
     
     
         6 . An electric conductor connecting member according to  claim 1 , wherein
 the adhesive layer comprises conductive particles, and   the maximum particle size r max  (μm) of the conductive particles is no greater than the sum of Rza and Rzb, where Rza (μm) is the ten-point height of roughness profile on the roughened surface on which the adhesive layer has been formed and Rzb (μm) is the ten-point height of roughness profile on the side of the electric conductor to be connected, which is in contact with the adhesive layer.   
     
     
         7 . An electric conductor connecting member according to  claim 1 , wherein
 the adhesive layer contains a latent curing agent and conductive particles,   the mean particle size D (μm) of the conductive particles is no greater than Ry, where Ry (μm) is the maximum height of the roughened surface on which the adhesive layer has been formed, and   the maximum particle size r max  (μm) of the conductive particles is no greater than the sum of Rza and Rzb, where Rza (μm) is the ten-point height of roughness profile on the roughened surface on which the adhesive layer has been formed and Rzb (μm) is the ten-point height of roughness profile on the side of the electric conductor to be connected, which is in contact with the adhesive layer.   
     
     
         8 . An electric conductor connecting member according to  claim 1 , wherein
 the adhesive layer contains a latent curing agent, and   the mean particle size Dc (μm) of the latent curing agent is no greater than Ry, where Ry (μm) is the maximum height on the roughened surface on which the adhesive layer has been formed.   
     
     
         9 . An electric conductor connecting member according to  claim 1 , wherein the metal foil is band-shaped. 
     
     
         10 . An electric conductor connecting member according to  claim 1 , wherein the metal foil is one comprising at least one metal selected from among Cu, Ag, Au, Fe, Ni, Pb, Zn, Co, Ti, Mg, Sn and Al. 
     
     
         11 . An electric conductor connecting member according to  claim 1 , wherein the ten-point height of roughness profile Rza (μm) on the roughened surface is no greater than 30 μm. 
     
     
         12 . A connection structure wherein an electric conductor connecting member according to  claim 1  and an electric conductor are situated with the roughened surface of the electric conductor connecting member and the electric conductor facing each other via an adhesive layer, and are hot pressed for electrical connection and bonding of the metal foil and electric conductor. 
     
     
         13 . A connection structure according to  claim 12 , wherein the side of the electric conductor connected to the metal foil has surface roughness, and the protrusions on the surface roughness sections of the electric conductor are in contact with the protrusions on the roughened surface of the metal foil. 
     
     
         14 . A solar cell module comprising a plurality of solar cells with surface electrodes, wherein
 the solar cells are electrically connected together via a metal foil bonded to the surface electrodes with bonding members,   the surface of each metal foil in contact with the surface electrode is a roughened surface, and   the metal foil is formed of an electric conductor connecting member according to  claim 1 .   
     
     
         15 . A solar cell module according to  claim 14 , wherein some or all of the sections of the metal foil other than the surface in contact with the surface electrode are covered with a resin.