Bifacial solar cell module

Patent metadata

Field	Value
Publication number	US-9337357-B2
Application number	US-201213536296-A
Country	US
Kind code	B2
Filing date	Jun 28, 2012
Priority date	Jan 2, 2012
Publication date	May 10, 2016
Grant date	May 10, 2016

Abstract

A bifacial solar cell module includes a solar cell panel including a plurality of strings arranged in a row direction. Each of the plurality of strings is formed by electrically connecting a plurality of bifacial solar cells arranged adjacent to one another in a column direction using an interconnector. The bifacial solar cell module further includes a plurality of lead wires electrically connecting an interconnector of the bifacial solar cell positioned at an end of each string to a junction box. At least one of the plurality of strings includes the n bifacial solar cells, and other strings not including the n bifacial solar cells include more than n bifacial solar cells, where n is a positive integer equal to or greater than 1.

First claim

What is claimed is:

1. A bifacial solar cell module comprising:
a solar cell panel including a plurality of bifacial solar cells arranged in a column and a row;
a front substrate on a front side of the plurality of bifacial solar cells;
a back substrate on a back side of the plurality of bifacial solar cells;
a first protective layer between the plurality of bifacial solar cells and the front substrate;
a second protective layer between the plurality of bifacial solar cells and the back substrate;
a plurality of strings, each of the plurality of strings comprising a series of bifacial solar cells adjacent to each other electrically connecting the plurality of bifacial solar cells adjacent to each another in the column using an interconnector;
a plurality of lead wires to electrically connect an interconnector of the plurality of bifacial solar cell at an end of the plurality of strings to an adjacent string; and
a junction box connecting the plurality of lead wires on a back side of the back substrate,
wherein the junction box and the plurality of bifacial solar cells are not overlapped,
wherein a number of bifacial solar cells in one of the plurality of strings in a region where the junction box is located is smaller than a number of bifacial solar cell in another one of the plurality of strings in a region where the junction box is not located, and
wherein the other of the strings is located at an outer portion of the solar panel and the one of the plurality of strings is located at an inner portion of the solar panel.

2. The bifacial solar cell module of claim 1 , wherein one of the plurality of bifacial solar cells on a first row of one of the plurality of strings includes more than n bifacial solar cells is adjacent to another one of the plurality of strings that includes n bifacial solar cells and, is connected to one of the plurality of bifacial solar cell on a second row of the n bifacial solar cells of the other of the plurality of strings using the lead wires.

3. The bifacial solar cell module of claim 1 , wherein the other of the plurality of strings which include more than n bifacial solar cells include a pair of outer strings at each edge of the solar cell panel, and
wherein the one of the plurality of strings which n bifacial solar cells are inner strings between the pair of outer strings.

4. The bifacial solar cell module of claim 3 , wherein the inner strings include first, second, third, and fourth inner strings.

5. The bifacial solar cell module of claim 4 , wherein a first row of each of the second and third inner strings does not include a bifacial solar cell.

6. The bifacial solar cell module of claim 5 , wherein the junction box is positioned on a back surface of the solar cell panel at a location corresponding to the first row of each of the second and third inner strings.

7. The bifacial solar cell module of claim 6 , wherein each of a pair of outer lead wires for electrically connecting the pair of outer strings to the junction box includes an interconnector connector connected to an interconnector of the corresponding outer string and connected to a junction box connector.

8. The bifacial solar cell module of claim 7 , wherein the interconnector connector and the junction box connector of each outer lead wire are arranged in a crossing direction to each other.

9. The bifacial solar cell module of claim 7 , wherein the plurality of lead wires include a first inner lead wire to electrically connect the first and second inner strings to the junction box, the first inner lead wire including a first interconnector connector connected to an interconnector of the first inner string, a second interconnector connector which is separated from the first interconnector connector and is connected to an interconnector of the second inner string, a first connector connecting the first interconnector connector to the second interconnector connector, and a junction box connector of the first inner lead wire connected to the second interconnector connector.

10. The bifacial solar cell module of claim 9 , wherein the first interconnector connector and the second interconnector connector are arranged in the same direction, and the first connector and the junction box connector of the first inner lead wire are arranged in a direction crossing the first and second interconnector connectors.

11. The bifacial solar cell module of claim 10 , wherein the plurality of wires include a second inner lead wire to electrically connect the third and fourth inner strings to the junction box and includes a third interconnector connector connected to an interconnector of the fourth inner string, a fourth interconnector connector which is separated from the third interconnector connector and is connected to an interconnector of the third inner string, a second connector connecting the third interconnector connector to the fourth interconnector connector, and a junction box connector of the second inner lead wire connected to the fourth interconnector connector.

12. The bifacial solar cell module of claim 11 , wherein the third interconnector connector and the fourth interconnector connector are arranged in the same direction, and the second connector and the junction box connector of the second inner lead wire are arranged in a direction crossing the third and fourth interconnector connectors.

13. The bifacial solar cell module of claim 12 , wherein the first junction box connector of the first inner lead wire and the second junction box connector of the second inner lead wire are positioned between the junction box connectors of the pair of outer lead wires.

14. The bifacial solar cell module of claim 12 , wherein the junction box connectors of the pair of outer lead wires are positioned between the first connector and the first junction box connector of the first inner lead wire and between the second connector and the second junction box connector of the second inner lead wire, respectively.

15. The bifacial solar cell module of claim 1 , further comprising an insulation film to prevent an electrical short circuit between the plurality of lead wires or an electrical short circuit between the plurality of lead wires and the plurality of bifacial solar cells.

16. The bifacial solar cell module of claim 15 , wherein the plurality of lead wires include an outer lead wire, a first inner lead wire, and a second inner lead wire, and at least a portion of the outer lead wire overlaps a portion of at least one of the first inner lead wire and the second inner lead wire, wherein the insulation film is positioned between the outer lead wire and at least one of the first inner lead wire and the second inner lead wire to prevent the electrical short circuit resulting from the overlap.

17. The bifacial solar cell module of claim 15 , wherein the insulation film is positioned in a space between the plurality of lead wires and the plurality of bifacial solar cells to prevent the electric short circuit resulting from the overlap between a portion of the plurality of lead wires and a portion of the plurality of bifacial solar cells.

18. The bifacial solar cell module of claim 15 , wherein the insulation film is colored in a same color as a substrate of the plurality of bifacial solar cells.

19. The bifacial solar cell module of claim 1 , wherein each of the plurality of bifacial solar cells includes a first electrode and a second electrode which are positioned on different surfaces of a substrate and have different polarities.

Assignees

• Hong Seeun
• Lee Youngsik
• Shin Junoh
• Kim Byongsu
• Kim Hwanyeon
• Lg Electronics Inc

Inventors

• Hong Seeun
• Lee Youngsik
• Shin Junoh
• Kim Byongsu
• Kim Hwanyeon

Classifications

• H10F19/00

  Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules · CPC title

• H10F10/148

  Double-emitter photovoltaic cells, e.g. bifacial photovoltaic cells · CPC title

• H10F77/937 Primary

  Busbar structures for modules · CPC title

• H10F19/90 Primary

  Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers (between thin-film photovoltaic cells on a single substrate H10F19/35) · CPC title

• H01L31/0684

  Electricity · mapped topic