SOLAR CELL MODULE AND METHODS FOR FABRICATING THE SAME

• US 20200135953A1
• Filed: 10/30/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Application

• Current Assignee: Shangrao Xinyuan Yuedong Technology Development Company Limited
• Original Assignee: LG Electronics, Inc. (LG Corporation)
• Inventors: KIM, Jinsung, LIM, Chunghyun
• Application Number:
  US16/668,828
• Publication Number:
  US 20200135953A1
• Time in Patent Office: Days
• CPC Class Codes: H01L 31/022433 Particular geometry of the grid contacts
• CPC Class Codes: H01L 31/02363 of the semiconductor body itself, e.g. textured active layers
• CPC Class Codes: H01L 31/035281 Shape of the body
• CPC Class Codes: H01L 31/0504 specially adapted for series or parallel connection of solar cells in a module
• CPC Class Codes: H01L 31/0508 the interconnection means having a particular shape
• CPC Class Codes: H01L 31/0512 made of a particular material or composition of materials
• CPC Class Codes: H01L 31/0516 specially adapted for interconnection of back-contact solar cells
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy
• CPC Class Codes: Y02E 10/547 Monocrystalline silicon PV cells

Abstract

Discussed is a solar cell module including a plurality of solar cells including a first electrode and a second electrode, the plurality of solar cells being disposed along a first direction and a plurality of wiring members connected to the first electrode of a first solar cell and the second electrode of a second solar cell, wherein each of the plurality of solar cells includes a first side surface of one side in the first direction, a second side surface having a larger surface roughness than the first side surface on another side, and a protrusion formed adjacent to the second side surface, and wherein the first and second solar cells are disposed with a gap of approximately 0.5 mm to 1.5 mm, and the first side surface of the second solar cell and the second side surface of the first solar cell are disposed to face each other.

Claims

1. A solar cell module, comprising:

a plurality of solar cells each having a long axis and a short axis, and including a first electrode disposed on a front surface and a second electrode disposed on a back surface thereof, the plurality of solar cells being disposed along a first direction; and

a plurality of wiring members connected to the first electrode of a first solar cell and the second electrode of a second solar cell adjacent to the first solar cell among the plurality of solar cells,

wherein each of the plurality of solar cells includes a first side surface of one side in the first direction, a second side surface having a larger surface roughness than the first side surface on another side, and a protrusion formed to be adjacent to the second side surface on the back surface, and

wherein the first solar cell and the second solar cell are disposed with a gap of approximately 0.5 mm to 1.5 mm, and the first side surface of the second solar cell and the second side surface of the first solar cell are disposed to face each other.

2. The solar cell of claim 1, wherein each of the plurality of solar cells includes:

a semiconductor substrate;

a first conductive type region formed on a front surface of the semiconductor substrate, and having a first conductive type opposite to a conductivity of the semiconductor substrate; and

a second conductive type region having a second conductive type as the semiconductor substrate, and formed on a back surface of the semiconductor substrate.

3. The solar cell of claim 2, wherein the protrusion is formed on the second conductive type region.

4. The solar cell of claim 1, wherein end parts of the plurality of wiring members are disposed adjacent to the protrusion on the back surface of the second solar cell in the first direction.

5. The solar cell of claim 4, wherein the second electrode includes a plurality of finger lines parallel to each other and a plurality of pad parts electrically connected to the plurality of finger lines and positioned along the first direction, and

wherein the end parts of the plurality of wiring members are joined to an outermost pad disposed to be closest to the protrusion of the second solar cell among the plurality of pad parts in the first direction.

6. The solar cell of claim 1, wherein thicknesses of the plurality of wiring members are approximately 270 μ

m to 320 μ

m.

7. The solar cell of claim 6, wherein the plurality of wiring members include a core layer of metal, and a solder layer formed surrounding a surface of the core layer and including a solder material, and

a thickness of the core layer is approximately 240 μ

m to 280 μ

m.

8. The solar cell of claim 7, wherein the wiring member has a wire shape.

9. The solar cell of claim 6, wherein a number of the plurality of wiring members is about 8 to 12.

10. The solar cell of claim 6, wherein the short axis is approximately half a length of the long axis.

11. A method for fabricating solar cell module, comprising:

dividing a mother solar cell into a plurality of solar cells by irradiating a laser to form a groove on one surface of the mother solar cell and separating the mother solar cell along the groove, wherein the plurality of solar cells each has a long axis and a short axis, and includes a first electrode disposed on a front surface and a second electrode disposed on a back surface thereof;

disposing the plurality of solar cells along a first direction; and

connecting a plurality of wiring members to the first electrode of a first solar cell and the second electrode of a second solar cell adjacent to the first solar cell among the plurality of solar cells,

wherein each of the plurality of solar cells includes a first side surface of one side in the first direction, a second side surface having a larger surface roughness than the first side surface on another side, and a protrusion formed adjacent to the second side surface on the back surface, and

wherein the first solar cell and the second solar cell are disposed with a gap of approximately 0.5 mm to 1.5 mm, and the first side surface of the second solar cell and the second side surface of the first solar cell are disposed to face each other.

12. The method of claim 11, wherein each of the plurality of solar cells includes:

a semiconductor substrate;

a first conductive type region formed on a front surface of the semiconductor substrate, and having a first conductive type opposite to a conductivity of the semiconductor substrate; and

a second conductive type region having a second conductive type as the semiconductor substrate, and formed on a back surface of the semiconductor substrate.

13. The method of claim 12, wherein the protrusion is formed on the second conductive type region.

14. The method of claim 11, wherein end parts of the plurality of wiring members are disposed adjacent to the protrusion on the back surface of the second solar cell in the first direction.

15. The method of claim 14, wherein the second electrode includes a plurality of finger lines parallel to each other and a plurality of pad parts electrically connected to the plurality of finger lines and positioned along the first direction, and

wherein the end parts of the plurality of wiring members are joined to an outermost pad disposed to be closest to the protrusion of the second solar cell among the plurality of pad parts in the first direction.

16. The method of claim 11, wherein thicknesses of the plurality of wiring members are approximately 270 μ

m to 320 μ

m.

17. The method of claim 16, wherein the plurality of wiring members include a core layer of metal, and a solder layer formed surrounding a surface of the core layer and including a solder material, and

wherein a thickness of the core layer is approximately 240 to 280 μ

m.

18. The method of claim 17, wherein the wiring member has a wire shape.

19. The method of claim 16, wherein a number of the plurality of wiring members is about 8 to 12.

20. The method of claim 16, wherein the short axis is approximately half a length of the long axis.