Electrical connection material and a solar cell including the same
An electrical connection material between conductors includes about 40 wt % to about 80 wt % of a urethane-modified acrylate resin, based on a total weight of the electrical connection material, the electrical connection material exhibiting, after curing, a tensile elongation of about 100% to about 500% and a yield point strain of about 10% to about 50% in a stress-strain curve.
1. An electrical connection material, comprising about 40 wt % to about 80 wt % of a urethane-modified acrylate resin, based on a total weight of the electrical connection material, the electrical connection material exhibiting, after curing, a tensile elongation of about 100% to about 500% and a yield point strain of about 10% to about 50% in a stress-strain curve,
wherein the electrical connection material further comprises at least one of an acrylonitrile butadiene copolymer and an ethylene-vinyl acetate copolymer.
2. The electrical connection material as claimed in claim 1 , wherein the electrical connection material further exhibits an elastic modulus of about 10 MPa to about 500 MPa at about 25° C. after curing.
3. The electrical connection material as claimed in claim 1 , wherein the electrical connection material exhibits a tensile elongation of about 200% to about 300% after curing.
4. The electrical connection material as claimed in claim 1 , wherein the electrical connection material includes:
a polymer binder resin, the polymer binder resin including the urethane-modified acrylate resin and the at least one of the acrylonitrile butadiene copolymer and the ethylene-vinyl acetate copolymer;
a radical polymerizable compound;
an organic peroxide; and
conductive particles.
5. The electrical connection material as claimed in claim 4 , wherein the electrical connection material includes:
about 70 wt % to about 80 wt % of the polymer binder resin, based on a total weight of the electrical connection material;
about 13 wt % to about 20 wt % of the radical polymerizable compound, based on a total weight of the electrical connection material;
about 1 wt % to about 5 wt % of the organic peroxide, based on a total weight of the electrical connection material; and
about 1 wt % to about 5 wt % of the conductive particles, based on a total weight of the electrical connection material.
6. The electrical connection material as claimed in claim 4 , wherein the polymer binder resin further includes an acrylic copolymer.
7. The electrical connection material as claimed in claim 1 , wherein the polymer binder resin includes about 60 wt % to about 90 wt % of the urethane-modified acrylate resin.
8. The electrical connection material as claimed in claim 6 , wherein the acrylic copolymer has a glass transition temperature ranging from about 50° C. to about 120° C.
9. The electrical connection material as claimed in claim 6 , wherein the acrylic copolymer has an acid value ranging from of about 1 mgKOH/g to about 100 mgKOH/g.
10. The electrical connection material as claimed in claim 4 , wherein the radical polymerizable compound includes at least one of a urethane(meth)acrylate oligomer, an epoxy(meth)acrylate oligomer, a polyester(meth)acrylate oligomer, a fluorine(meth)acrylate oligomer, a fluorene(meth)acrylate oligomer, a silicone(meth)acrylate oligomer, a phosphorus(meth)acrylate oligomer, a maleimide modified(meth)acrylate oligomer, an acrylate oligomer, a methacrylate oligomer, and a (meth)acrylate monomer.
11. The electrical connection material as claimed in claim 4 , wherein the organic peroxide includes at least one of a ketone peroxide, a peroxy ketal, a hydroperoxide, a dialkyl peroxide, a diacyl peroxide, a peroxyester, and a peroxy carbonate.
12. The electrical connection material as claimed in claim 4 , wherein the conductive particles include metal particles having Ni, Pd, Cu, Ag, Al, Ti, and/or Cr, and/or non-conductive particles coated with metal having Ni, Pd, Cu, Ag, Al, Ti, and/or Cr.
13. The electrical connection material as claimed in claim 1 , wherein a total combined amount of the urethane-modified acrylate resin and the at least one acrylonitrile butadiene copolymer and ethylene-vinyl acetate copolymer in the electrical connection material ranges from about 70 wt % to about 80 wt %, based on a total weight of the electrical connection material.
14. The electrical connection material as claimed in claim 13 , wherein the electrical connection material further comprises an acrylic copolymer, and the total combined amount of the urethane-modified acrylate resin, the at least one acrylonitrile butadiene copolymer and ethylene-vinyl acetate copolymer, and the acrylic copolymer in the electrical connection material ranges from about 70 wt % to about 80 wt %, based on a total weight of the electrical connection material.
15. An electrical connection material, the electrical connection material comprising about 40 wt % to about 80 wt % of a urethane-modified acrylate resin, based on a total weight of the electrical connection material, the electrical connection material exhibiting, after curing, an elastic modulus of about MPa 10 to about 500 MPa at about 25° C. and tensile elongation of about 200% to about 300% after curing,
wherein the electrical connection material further comprises at least one of an acrylonitrile butadiene copolymer and an ethylene-vinyl acetate copolymer.
16. A solar cell module having a plurality of solar cells connected via a connection structure, the connection structure comprising:
at least one electrode on a surface of each solar cell;
a conductive wire connected to the electrodes on the plurality of solar cells; and
an electrical connection material between the conductive wire and each of the electrodes, the electrical connection material comprising about 40 wt % to about 80 wt % of a urethane-modified acrylate resin, based on a total weight of the electrical connection material, and exhibiting, after curing, a tensile elongation of about 100% to about 500% and a yield point strain of about 10% to about 50% in a stress-strain curve;
wherein the electrical connection material further comprises at least one of an acrylonitrile butadiene copolymer and an ethylene-vinyl acetate copolymer.
17. The solar cell module as claimed in claim 16 , wherein the electrical connection material is on a copper conductor, the copper conductor including on a surface thereof at least one of metal copper, rust-proofed copper or tin, solder, silver, and nickel.