JP5927550B2 - Solar cell module - Google Patents

Description

  The present invention relates to a solar cell module.

  In recent years, a solar cell module having a back junction solar cell is known as a solar cell module having excellent photoelectric conversion efficiency. For example, Patent Document 1 describes a solar cell module including a plurality of back junction solar cells electrically connected by a wiring material. In the solar cell module described in Patent Document 1, a rectangular wiring member is bonded from one end of the solar cell to the other end in a direction perpendicular to the arrangement direction of the solar cells.

JP 2009-266848 A

  Usually, the thermal expansion coefficient of the wiring material is different from the thermal expansion coefficient of the solar cell. For this reason, when the temperature of the solar cell module changes, stress is generated between the solar cell and the wiring member. Due to this stress, the solar cell may be warped or the wiring material may be peeled off from the solar cell. Therefore, in a solar cell module, how to suppress a decrease in reliability due to a difference in thermal expansion coefficient between the solar cell and the wiring material has become a major issue.

  An object of the present invention is to provide a solar cell module having improved reliability.

The solar cell module according to the present invention is arranged along the first direction, and is adjacent to the plurality of solar cells having the first and second electrodes on one main surface side in the first direction. A wiring member that electrically connects the first electrode of one solar cell and the second electrode of the other solar cell, and the wiring member and the solar cell are bonded. An adhesive layer, and the wiring member extends toward one solar cell of adjacent solar cells in the first direction, and is bonded to the one solar cell by the adhesive layer. A plurality of second parts extending toward the other solar cell side of the first adherend and the other solar cell adjacent in the first direction and bonded to the other solar cell by the adhesive layer. Adhered part, the first adhering part, and the second adhering part A first curved portion projecting to one side in a second direction perpendicular to the first direction, the first adherend portion, and the second adherend A second curved portion protruding to the other side of the second direction, the first bonded portion and the second bonded portion, and A curved portion projecting to one side in the second direction, the third curved portion arranged on one side in the second direction with respect to the first curved portion, and the first adherend Connected to the second bonded portion and projecting to the other side in the second direction, the other side in the second direction from the second curved portion And a line connected to the fourth curved portion on one side in the second direction and connected to the third curved portion on the other side in the second direction. And The first music part, the second music part, the third music part, and the fourth music part respectively include the first adherend part and the second adherend part. The first opening of the first opening having a shape that does not have a corner in the portion to which the first and second adherend portions of the wiring member are connected and the first opening is formed. A second opening that is located on one side in a second direction perpendicular to the direction of the first opening and that covers an end of the first opening on the one side in the second direction; A third opening that is located on the other side of the first opening in the second direction and is formed so as to cover the other end of the first opening in the second direction. ing.

  According to the present invention, it is possible to provide a solar cell module having improved reliability.

1 is a schematic cross-sectional view of a solar cell module according to an embodiment of the present invention. It is a schematic back view of the solar cell in one embodiment of the present invention. It is a schematic back view of a solar cell string in one embodiment of the present invention. FIG. 4 is a schematic cross-sectional view taken along line IV-IV in FIG. 3.

  Hereinafter, an example of the preferable form which implemented this invention is demonstrated. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.

  Moreover, in each drawing referred in embodiment etc., the member which has a substantially the same function shall be referred with the same code | symbol. The drawings referred to in the embodiments and the like are schematically described, and the ratio of the dimensions of the objects drawn in the drawings may be different from the ratio of the dimensions of the actual objects. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.

  FIG. 1 is a schematic cross-sectional view of a solar cell module 1 according to this embodiment. The solar cell module 1 includes a solar cell string 10. The solar cell string 10 is disposed between the first protection member 11 located on the light receiving surface side and the second protection member 12 located on the back surface side. A filler layer 13 is provided between the first protective member 11 and the second protective member 12. The solar cell string 10 is sealed with a filler layer 13.

  The 1st protection member 11 can be comprised by the member which has translucency, such as a glass substrate and a resin substrate, for example. The second protective member 12 can be constituted by, for example, a resin sheet, a resin sheet with a metal foil interposed therebetween, a glass substrate, a resin substrate, or the like. The filler layer 13 can be made of, for example, a resin such as ethylene / vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyethylene (PE), polyurethane (PU), or the like.

  The solar cell string 10 is configured by arranging wiring members 30 between a plurality of solar cells 20 along the x direction (first direction). The solar cell 20 has first and second main surfaces 20a and 20b. Solar cell 20 receives light on first main surface 20a. For this reason, the 1st main surface 20a may be called a light-receiving surface, and the 2nd main surface 20b may be called a back surface. The solar cell 20 may receive light only on the first main surface 20a constituting the light receiving surface and generate power, or may receive light on any of the first and second main surfaces 20a, 20b. Alternatively, a double-sided light receiving type having a configuration capable of generating power may be used.

  In addition, the kind of solar cell 20 is not specifically limited. The solar cell 20 can be constituted by, for example, a crystalline silicon solar cell using a crystalline silicon substrate.

  FIG. 2 shows a schematic rear view of the solar cell 20. As shown in FIG. 2, the solar cell 20 includes first and second electrodes 21 and 22 on the second main surface 20b side. Specifically, the solar cell 20 includes a photoelectric conversion unit 23 and first and second electrodes 21 and 22 on the main surface on the back surface side of the photoelectric conversion unit 23.

  Each of the first and second electrodes 21 and 22 is provided in a comb shape. The first electrode 21 and the second electrode 22 are arranged so that comb teeth are alternately arranged. Specifically, each of the first and second electrodes 21 and 22 has a plurality of finger portions 21a and 22a and bus bar portions 21b and 22b. Each of the plurality of finger portions 21a and 22a extends along the x direction. The plurality of finger portions 21a and 22a are arranged at intervals from each other along the y direction (second direction) perpendicular to the x direction.

  The plurality of finger portions 21a are electrically connected to the bus bar portion 21b. The bus bar portion 21b is arranged on one side (x1 side) in the x direction of the plurality of finger portions 21a. The bus bar portion 21 b is provided from the one end portion in the y direction to the other end portion in the x1 end portion in the x direction of the solar cell 20.

  Similarly, the plurality of finger portions 22a are electrically connected to the bus bar portion 22b. The bus bar portion 22b is disposed on the other side (x2 side) in the x direction of the plurality of finger portions 22a. The bus bar portion 22b is provided from one end portion in the y direction to the other end portion in the x2 side end portion in the x direction of the solar cell 20.

  As shown in FIGS. 3 and 4, the plurality of solar cells 20 are electrically connected by a wiring member 30. Specifically, the first electrode 21 of one solar cell 20 of the solar cells 20 adjacent in the x direction and the second electrode 22 of the other solar cell are on the second main surface 20b side, and the wiring member 30. Are electrically connected.

  The wiring member 30 and the second main surface 20b of the solar cell 20 are bonded by an adhesive layer 40 shown in FIG. The adhesive layer 40 can be composed of, for example, a cured product of solder or resin adhesive. The wiring member 30 can be composed of, for example, a metal foil such as Ag or Cu, a laminate of metal foil, a metal foil whose surface is covered with solder or the like.

  Next, the configuration of the wiring member 30 in the present embodiment will be described in more detail with reference mainly to FIG.

  The wiring member 30 includes a wiring member main body 31. The wiring material body 31 is not directly bonded to the solar cell 20. The wiring material body 31 has an elongated shape extending along the y direction perpendicular to the x direction. The wiring material body 31 is provided in a substantially linear shape. The wiring material main body 31 is provided from one end in the y direction of the solar cell 20 to the other end.

  The wiring material main body 31 includes a plurality of first adherend portions 32 and a plurality of second adherend portions 33. Each of the plurality of first adherends 32 and the plurality of second adherends 33 is spaced apart from each other along the y direction. The plurality of first adherend portions 32 and the plurality of second adherend portions 33 are provided at positions that are symmetric with respect to the x direction. That is, the wiring material main body 31 includes a plurality of connection portions 31a that are spaced apart from each other in the y direction, and the first adherend portion 32 and the second adherend portion 33 are respectively connected to the plurality of connection portions 31a. And are connected.

  The first adherend portion 32 extends from the connection portion 31a of the wiring material body 31 toward one solar cell 20 side (x1 side) of the solar cells 20 adjacent in the x direction, and the tip end portion is rounded. It is comprised so that it may become a shape. The first bonded portion 32 is bonded to the bus bar portion 22 b formed on the second main surface 20 b of the solar cell 20 by the bonding layer 40.

  Similarly, the second adherend portion 33 is the other solar cell of the solar cell 20 adjacent in the x direction from the connection portion 31a that is a portion to which the first adherend portion 32 of the wiring material body 31 is connected. It is configured to extend toward the 20 side (x2 side) and have a rounded end. The second bonded portion 33 is bonded to the bus bar portion 21 b formed on the second main surface 20 b of the solar cell 20 by the bonding layer 40.

  A first opening 31a1 is provided in the connection portion 31a of the wiring material body 31 corresponding to the portion to which the first and second adherend portions 32 and 33 are connected. The first opening 31a1 has an elongated shape extending along the y direction. In the y direction, the width W1 of the first opening 31a1 is equal to or larger than the width W of the connection portion 31a. Further, the first opening 31a1 is provided in a shape that does not have corners in the outline.

  In addition, the wiring material body 31 is provided with second and third openings 31a2 and 31a3. The second opening 31a2 is located on one side (y1 side) in the y direction of the first opening 31a1. The second opening 31a2 is formed so as to cover the y1 side end of the first opening 31a1 in the y direction. Both end portions of the second opening 31a2 overlap the first and second adherend portions 32 and 33 in the x direction. The second opening 31a2 is substantially U-shaped.

  Similarly, the third opening 31a3 is located on the other side (y2 side) in the y direction of the first opening 31a1. The third opening 31a3 is formed so as to cover the end of the first opening 31a1 on the y2 side in the y direction. Both end portions of the third opening 31a3 overlap with the first and second adherend portions 32 and 33 in the x direction. The end portion of the third opening 31a3 located on the x1 side of the first opening 31a1 is opposed to the end portion of the second opening 31a2 located on the x1 side of the first opening 31a1 in the y direction. An end portion of the third opening 31a3 located on the x2 side of the first opening 31a1 is opposed to an end portion of the second opening 31a2 located on the x2 side of the first opening 31a1 in the y direction. The third opening 31a3 is substantially U-shaped.

  As described above, in the present embodiment, the first to third openings 31 a 1 to 31 a 3 are formed in the wiring material body 31. For this reason, the wiring material main body 31 includes first to fourth curved portions 31b1, 31b2, 31c1, and 31c2. Each of the first to fourth curved portions 31 b 1, 31 b 2, 31 c 1, and 31 c 2 connects the first adherend portion 32 and the second adherend portion 33. The first and second curved portions 31b1 and 31b2 protrude on one side in the y direction (y1 side), while the third and fourth curved portions 31c1 and 31c2 are on the other side in the y direction (y2 side). Protruding. The second curved portion 31b2 is arranged on the y1 side in the y direction with respect to the first curved portion 31b1. The 4th music part 31c2 is distribute | arranged to the y2 side of the y direction rather than the 3rd music part 31c1. That is, the first and third curved portions 31b1 and 31c1 are disposed relatively inside, and the second and fourth curved portions 31b2 and 31c2 are disposed relatively outside. The second curved portion 31b2 and the fourth curved portion 31b4 which are adjacent in the y direction are connected by a linear portion 31d.

  In the present embodiment, an example in which each of the first to fourth curved portions 31b1, 31b2, 31c1, and 31c2 is configured by a curved portion will be described. However, the 1st-4th curved part may be comprised by the bending part, for example.

  As described above, in the present embodiment, the first opening 31a1 is provided in the connection portion 31a to which the first and second adherend portions 32 and 33 of the wiring material body 31 are connected. For this reason, the connection part 31a can be expanded-contracted. Therefore, when the distance between the solar cells 20 changes due to, for example, a temperature change of the solar cell module 1, the stress applied to the wiring member 30 or the solar cell 20 is relieved by the expansion and contraction of the connection portion 31a. . Therefore, peeling of the wiring material 30 from the solar cell 20 can be suppressed. As a result, the solar cell module 1 having improved reliability can be realized.

  In the present embodiment, the first opening 31a1 has a shape having no corners. Thereby, even when repeated stress is applied to the wiring member 30, only a specific region can be prevented from being deformed by the stress, and disconnection due to fatigue can be prevented.

  In the present embodiment, the width W1 of the first opening 31a1 is greater than or equal to the width W of the connection portion 31a in the y direction. Therefore, since the connection part 31a is easily stretchable, the stress relaxation effect of the connection part 31a is high. Therefore, more improved reliability can be obtained.

  Furthermore, in this embodiment, since the second and third openings 31a2 and 31a3 are provided, the ease of expansion and contraction of the connecting portion 31a is further enhanced, and the stress relaxation effect of the connecting portion 31a is further enhanced. Therefore, further improved reliability can be obtained.

  In addition, it is preferable that the 2nd and 3rd opening 31a2, 31a3 also has a shape which does not have a corner | angular part like the 1st opening part 31a1. Thereby, even when repeated stress is applied to the wiring member 30, it is possible to suppress only a specific region from being deformed by the stress and to prevent disconnection due to fatigue.

  The present invention includes various embodiments not described herein. For example, the first opening may be provided only in a part in the y direction of the portion where the first and second adherend portions of the wiring material body are connected. The wiring member may have only a pair of first and second adherends. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.

DESCRIPTION OF SYMBOLS 1 ... Solar cell module 20 ... Solar cell 20a ... 1st main surface 20b ... 2nd main surface 21 ... 1st electrode 22 ... 2nd electrode 30 ... Wiring material 31 ... Wiring material main body 31a ... Connection part 31a1 ... 1st opening 31a2 ... 2nd opening 31a3 ... 3rd opening 31b1 ... 1st curved part 31b2 ... 2nd curved part 31c1 ... 3rd curved part 31c2 ... 4th curved part 32 ... 1st covered Adhesive part 33 ... second adherend part 40 ... adhesive layer

Claims (2)

A plurality of solar cells arranged along a first direction and having first and second electrodes on one main surface side;
A wiring material that electrically connects the first electrode of one solar cell of the solar cells adjacent in the first direction and the second electrode of the other solar cell;
An adhesive layer bonding the wiring material and the solar cell;
With
The wiring material,
Before Symbol One extends toward the solar cell side, wherein the adhesive layer by the one of the first of the adhesive portion of the plurality is bonded to the solar cell of the solar cell adjacent to each other in a first direction,
And the other extends toward the solar cell side, wherein the adhesive layer by the other of the second of the bonding portion of the plurality is bonded to the solar cell of the solar cell adjacent in the previous SL first direction,
A first curved portion connecting the first adherend and the second adherend and projecting to one side in a second direction perpendicular to the first direction;
A second curved portion that connects the first adherend and the second adherend and protrudes to the other side in the second direction;
A curved portion connecting the first adherend and the second adherend and projecting to one side in the second direction, the first bent portion being more than the first bent portion. A third bend disposed on one side in the direction of 2;
A curved portion connecting the first adherend and the second adherend and projecting to the other side in the second direction, the first bent portion being more than the second bent portion. A fourth curved portion arranged on the other side in the direction of 2,
Connected before SL to the fourth curved portion Te one side smell of the second direction, a linear portion connected to the third bending portion on the other side of the second direction,
Including
The first music part, the second music part, the third music part, and the fourth music part respectively connect the first adherend and the second adherend,
In the portion where the first and second adherends of the wiring material are connected, a first opening having a shape having no corners;
The first opening is located on one side in a second direction perpendicular to the first direction, and is formed so as to cover an end portion on the one side in the second direction of the first opening. A second opening made;
A third opening located on the other side of the first opening in the second direction and formed to cover the other end of the first opening in the second direction;
A solar cell module provided with The first opening is pre SL has a second first and previous SL that put in the direction of the second width larger than that of the bonded portion, the solar cell module according to claim 1.

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