Solar cell and solar cell module

• US 9,099,590 B2
• Filed: 02/15/2010
• Issued: 08/04/2015
• Est. Priority Date: 02/17/2009
• Status: Active Grant

• Current Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Original Assignee: Panasonic Intellectual Property Management Co., Ltd. (Panasonic Holdings Corporation)
• Inventors: Taira, Shigeharu, Yoshimine, Yukihiro, Ishii, Yousuke
• Primary Examiner(s): MEKHLIN, ELI S
• Application Number:
  US13/201,882
• Publication Number:
  US 20120031457A1
• Time in Patent Office: 1,996 Days
• Field of Search: 136/244, 136/256
• US Class Current: 1/1
• CPC Class Codes: H01L 31/022433 Particular geometry of the grid contacts
• CPC Class Codes: H01L 31/0508 the interconnection means having a particular shape
• CPC Class Codes: Y02E 10/50 Photovoltaic [PV] energy

Abstract

A solar cell (10) provided with connecting wires (351) which are connected to light receiving surface side fine-line electrodes (30A). The connecting wires (351) have expanding portions (BP1, BP2) which expand from the connection region (R1) where wiring member is to be connected. The expanding portions (BP1, BP2) expand in an orthogonal direction orthogonal to the longitudinal direction of the wiring material in a state where the wiring member is connected to the connecting wires (351).

Claims

1. A solar cell having a wiring member for connection to another solar cell, the solar cell comprising:

a photoelectric conversion body; and

connectors comprising;

a plurality of fine-line electrodes formed as printed lines of conductive material having a first width on a main surface of the photoelectric conversion body;

a connecting wire formed as printed lines of conductive material on the main surface of the photoelectric conversion body; and

a wiring member bonded with a resin adhesive and formed over the connecting wire and fine-line electrodes, wherein

the connecting wire has a fine-lined shape with a line width that is less than one third of the line width of the wiring member and having a main axis within a connection region and has a straight protruding portion that protrudes from under the connection region to one side of the connection region in the main surface to which the wiring member is connected, and

the protruding portion protrudes in an orthogonal direction neither perpendicular nor parallel to a longitudinal direction of the wiring member to the other side of the connection region, and wherein

two straight portions of the connecting wire meet to form an apex repeatedly on alternate sides of the connection region in a zig-zag pattern,

wherein the connecting wire is formed over the fine-line electrodes.

2. The solar cell according to claim 1, wherein the protruding wire portion outside of the connection region is electrically connected to at least one of the plurality of fine-line electrodes.

3. The solar cell according to claim 1, wherein

the connecting wire has a plurality of protruding wire portions, and

the plurality of protruding wire portions are dispersed in a longitudinal direction of the connection region.

4. The solar cell according to claim 1, wherein a lateral displacement of the connecting wire in the orthogonal direction is wider than a line width of the wiring member in the orthogonal direction.

5. The solar cell according to claim 1, wherein the plurality of fine-line electrodes electrically connect each other through the connecting wire.

6. The solar cell according to claim 1, wherein

the connecting wire includes a plurality of protruding wire portions, each electrically connected to at least one of the plurality of fine-line electrodes.

7. The solar cell according to claim 1, comprising

a first connecting wire formed on a first main surface of the photoelectric conversion body, and a second connecting wire formed on a second opposing main surface of the photoelectric conversion body,

a formation region of the first connecting wire is included in a formation region of the second connecting wire in a plan view of the photoelectric conversion body, and

a width of a second connecting wire forming the second connecting wire portion is wider than a width of a first connecting wire forming the first connecting wire portion.

8. The solar cell according to claim 7, wherein

the first connecting wire is formed on a light-receiving surface of the photoelectric conversion body, the light-receiving surface mainly receiving light, and

the second connecting wire is formed on a back surface of the photoelectric conversion body, the back surface receiving a less amount of light than the light-receiving surface.

9. The solar cell according to claim 7, wherein a height of the first connecting wire in a thickness direction of the solar cell is higher than a height of the second connecting wire.

10. A solar cell according to claim 1, wherein the resin adhesive is electrically conductive.

11. The solar cell of claim 1, wherein the connecting wire penetrates the wiring member surface to a depth greater than the depth of the fine-line electrodes penetration into the surface of the wiring member surface.

12. The solar cell of claim 1, wherein the line width of the connecting wire is between 100 and 250 microns.

13. The solar cell of claim 1,

wherein each apex on one of the alternate sides extends past the connection region on the one of the alternate sides of the connection region, and

wherein each apex on the other of the alternate sides extends past the connection region of the other of the alternate sides of the connection region.

14. A solar cell module including a solar cell sealed between a light-receiving surface side protection member and a back surface side protection member and to which a wiring member is connected, wherein

the solar cell comprises:

a photoelectric conversion body;

a plurality of fine-line electrodes formed on a main surface of the photoelectric conversion body;

a connecting wire formed over the fine-line electrodes on the main surface of the photoelectric conversion body and connected to the fine-line electrodes, and

a wiring member bonded with a resin adhesive and formed over the connecting wire and fine-line electrodes on the main surface of the photoelectric conversion body and defining a connection region as the area that is under the wiring member and over the solar cell;

wherein

the connecting wire has a fine-lined shape with a line width that is less than one third of the line width of the wiring member and has a main axis in the connection region and has a protruding portion having a width that is narrower than the wiring member width and protrudes from one side of the connection region to an opposite side of the connection region in the main surface to which the wiring member is connected, wherein

two straight protruding portions of the connecting wire meet to form an apex repeatedly on alternate sides of the connection region in a zig-zag pattern.

15. A solar cell module according to claim 14, wherein each connecting wire protruding wire portion has a width that is narrower than the wiring member.

16. A solar cell module according to claim 14, wherein the wiring member is disposed on the connection region through a tape-shaped or paste-like resin adhesive.

17. A solar cell module according to claim 16, wherein the wiring member is disposed through a tape-shaped resin adhesive.

18. A solar cell having a wiring member for connection to another solar cell, the solar cell comprising:

a photoelectric conversion body;

a plurality of fine-line electrodes formed as printed lines of conductive material on a main surface of the photoelectric conversion body;

a connecting wire formed as printed conductive material over and crossing the fine line electrodes on the main surface of the photoelectric conversion body; and

a wiring member formed over the connecting wire and the fine-line electrodes and defining a connection region as the area that is under the wiring member and over the solar cell and which is electrically connected to the connecting wire and the fine-line electrodes, wherein

the connecting wire has straight wire portions protruding from the connection region having widths that are narrower than the wiring member width and protrude neither perpendicular nor parallel alternately on both sides of the connection region in the main surface and wherein

two straight portions of the connecting wire that are neither perpendicular nor parallel meet to form an apex repeatedly on alternate sides of the connection region in a zig-zag pattern.

19. A solar cell according to claim 18, wherein the formed apexes are located on the fine-line electrodes.

20. A solar cell according to claim 18, wherein each connecting wire protruding wire portion has a width that is narrower than the wiring member.

21. A solar cell according to claim 18, wherein the wiring member is disposed through a tape-shaped or paste-like resin adhesive.

22. A solar cell according to claim 21, wherein the wiring member is disposed through a tape-shaped resin adhesive.

23. A solar cell configured for connection to another solar cell through a wiring member, the solar cell comprising:

a photoelectric conversion body;

a plurality of fine-line electrodes formed as printed lines of conductive material on a main surface of the photoelectric conversion body;

a connecting wire formed as printed lines of conductive material over the fine-line electrodes on the main surface of the photoelectric conversion body and connected to the fine-line electrodes, and

a wiring member formed over and electrically connected to both the connecting wire and the fine-line electrodes and defining a connection region as the area that is under the wiring member and over the solar cell,

wherein the connecting wire has a straight, oblique protruding wire portion that has a width that is narrower than the wiring member width and protrudes from the connection region to one side of the connecting region in the main surface to which the wiring member is connected, and

the protruding portion protrudes in an orthogonal direction neither perpendicular nor parallel to a longitudinal direction of the wiring member to the other side of the connection region wherein

two straight portions of the connecting wire meet repeatedly to form junctions on alternate sides of the connection region and are bisected at these junctions with fine line electrodes.