Solar cell module
A solar cell module having an improved wiring structure is disclosed. The solar cell module includes a plurality of solar cells each including first electrodes and second electrodes which are alternately arranged in parallel with each other, a plurality of wiring members configured to electrically connect the plurality of solar cells, and which are positioned adjacent to each other among the plurality of solar cells, in a direction crossing the first electrodes and the second electrodes, and a plurality of bonding layers configured to fix the plurality of wiring members to the plurality of solar cells.
1. A solar cell module comprising:
a front substrate;
a back substrate;
a plurality of solar cells each including a semiconductor substrate, and first electrodes and second electrodes which are alternately arranged in parallel with each other and formed on a back surface of the semiconductor substrate, the first electrodes and the second electrodes extending in a first direction;
a plurality of wiring members configured to electrically connect adjacent two solar cells of the plurality of solar cells, and extending in a second direction crossing the first direction;
a plurality of bonding layers configured to fix the plurality of wiring members to the plurality of solar cells, and each having a first water vapor transmission rate and a first thickness;
a front passivation layer configured to encapsulate the plurality of solar cells and the front substrate; and
a back passivation layer configured to encapsulate the plurality of solar cells and the back substrate, and having a second water vapor transmission rate higher than the first water vapor transmission rate and a second thickness thicker than the first thickness,
wherein the first thickness of the plurality of bonding layers is approximately 70 μm to 100 μm, and
wherein each bonding layer extends in the first direction configured to parallel the first and second electrodes and has a second direction width covering at least a first electrode and an adjacent second electrode of the first electrodes and the second electrodes.
2. The solar cell module of claim 1 , wherein the plurality of bonding layers are positioned in parallel with one another and form a stripe arrangement.
3. The solar cell module of claim 1 , wherein the plurality of bonding layers are entirely formed on each solar cell.
4. The solar cell module of claim 1 , wherein each bonding layer includes openings exposing the first electrodes at crossings of the plurality of wiring members and the first electrodes.
5. The solar cell module of claim 1 , wherein a thickness of the plurality of bonding layers is greater than a thickness of the second electrodes.
6. The solar cell module of claim 1 , wherein the plurality of bonding layers insulate the second electrodes from the plurality of wiring members at crossings of the plurality of wiring members and the second electrodes.
7. The solar cell module of claim 4 , wherein the first electrodes are soldered to the plurality of wiring members at the openings.
8. The solar cell module of claim 7 , further comprising a conductive layer positioned in the openings and configured to connect the plurality of wiring members to the first electrodes, the conductive layer being an adhesive resin including conductive particles.
9. The solar cell module of claim 8 , wherein the conductive particles are particles formed of a conductive metal or are particles formed of a solder including at least one of Pb, Sn, SnIn, SnBi, SnPb, SnCuAg, or SnCu.
10. The solar cell module of claim 1 , wherein the plurality of bonding layers further include second openings exposing the second electrodes at crossings of the plurality of wiring members and the second electrodes.
11. The solar cell module of claim 10 , further comprising an insulating layer positioned in the second openings and configured to insulate the plurality of wiring members from the plurality of second electrodes.
12. The solar cell module of claim 1 , wherein the plurality of wiring members have a rectangular cross section, and
wherein a width of the plurality of wiring members is 1 mm to 2 mm, and a thickness of the plurality of wiring members is 60 μm to 120 μm.
13. The solar cell module of claim 12 , wherein 10 to 36 of the plurality of wiring members are used to connect adjacent solar cells of the plurality of solar cells.
14. The solar cell module of claim 1 , wherein the plurality of wiring members are interposed between the plurality of bonding layers and the back passivation layer.
15. The solar cell module of claim 1 , wherein a thickness of the plurality of bonding layers is greater than each of a thickness of the first electrodes and a thickness of the second electrodes.
16. The solar cell module of claim 1 , wherein the plurality of bonding layers are positioned between the plurality of wiring members and the back surface of the semiconductor substrate.
17. The solar cell module of claim 1 , wherein each of the front and back passivation layers includes at least one of ethylene vinyl acetate (EVA) copolymer, ethylene-ethyl acrylate (EEA) copolymer, polyvinyl butyral (PVB), polyolefine, silicon, urethane, acrylic, or epoxy, and
wherein bonding layer of the plurality of bonding layer is formed of an adhesive resin including at least one of acrylic, epoxy, or UV resin.
18. The solar cell mode claim 1 , wherein each bonding layer intersects the plurality of wiring members.