WO2013014810A1 - Solar battery module and method for manufacturing same - Google Patents

Abstract

Provided are a solar battery module having improved reliability and a method for manufacturing the same. A solar battery module (1) is provided with a solar battery (10) and wiring (11) which is electrically connected to the solar battery (10). The solar battery (10) comprises a photoelectric conversion section (20), insulation layers (21, 22) which cover part of the surface of the photoelectric conversion section (20), and electrodes (31, 32). The insulation layers (21, 22) have openings (21a, 22a) which expose the photoelectric conversion section (20). The electrodes (31, 32) are arranged on the surface of the photoelectric conversion section (20) inside the openings (21a, 22a). The electrodes (31, 32) are thinner than the insulation layers (21, 22). The wiring (11) is provided in such a way that an end section (11b, 11c) at at least one side in the width direction (y) is positioned above the insulation layers (21, 22), and also in such a way as to have a portion (11a) which is arranged inside the openings (21a, 22a) and is electrically connected to the electrodes (31, 32).

Description

Solar cell module and manufacturing method thereof

The present invention relates to a solar cell module and a manufacturing method thereof.

In recent years, attention has been focused on solar cell modules having a plurality of solar cells electrically connected by wiring materials as an energy source having a small environmental load. The solar cell includes a photoelectric conversion unit and an electrode disposed on the photoelectric conversion unit. For example, in Patent Document 1, a translucent insulating layer is arranged on a part of the main surface of the photoelectric conversion unit, and the translucent insulating layer of the photoelectric conversion unit is formed by plating using the translucent insulating layer as a mask. Forming an electrode on the exposed portion of the substrate. In patent document 1, the thickness of an electrode is larger than the thickness of a translucent insulating layer.

JP 2000-58885 A

In recent years, there has been an increasing demand for improving the reliability of solar cell modules.

The main object of the present invention is to provide a solar cell module having improved reliability and a method for manufacturing the same.

The solar cell module according to the present invention includes a solar cell and a wiring material. The wiring material is electrically connected to the solar cell. A solar cell has a photoelectric conversion part, an insulating layer, and an electrode. The insulating layer covers a part of the surface of the photoelectric conversion unit. The insulating layer has an opening that exposes the photoelectric conversion portion. The electrode is disposed on the surface of the photoelectric conversion unit in the opening. The electrode is thinner than the insulating layer. The wiring member is provided so that at least one end in the width direction is located on the insulating layer, is disposed in the opening, and has a portion electrically connected to the electrode. .

The method for manufacturing a solar cell module according to the present invention includes a photoelectric conversion unit, an insulating layer that covers a part of the surface of the photoelectric conversion unit, and that exposes the photoelectric conversion unit, and the photoelectric conversion unit within the opening. A step of preparing a solar cell that is disposed on the surface and having an electrode having a thickness smaller than that of the insulating layer; and the wiring material, at least one end in the width direction is positioned on the insulating layer, and A part of which is disposed in the opening and is bonded to the solar cell so as to be electrically connected to the electrode.

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

FIG. 1 is a schematic cross-sectional view of the solar cell module according to the first embodiment. FIG. 2 is a schematic plan view of the solar cell in the first embodiment. FIG. 3 is a schematic back view of the solar cell in the first embodiment. 4 is a schematic cross-sectional view of a portion of the solar cell module taken along line IV-IV in FIG. FIG. 5 is a schematic cross-sectional view for explaining the method for manufacturing the solar cell module according to the first embodiment. FIG. 6 is a schematic cross-sectional view of a part of the solar cell module according to the second embodiment. FIG. 7 is a schematic cross-sectional view of a part of the solar cell module according to the third embodiment. FIG. 8 is a schematic cross-sectional view of a part of the solar cell module according to the fourth embodiment. FIG. 9 is a schematic cross-sectional view of a part of the solar cell module according to the fifth embodiment. FIG. 10 is a schematic cross-sectional view of a part of the solar cell module according to the sixth embodiment. FIG. 11 is a schematic cross-sectional view of a part of the solar cell module according to the seventh embodiment.

Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.

In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. 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.

(First embodiment)
As shown in FIG. 1, the solar cell module 1 includes a plurality of solar cells 10. The plurality of solar cells 10 are electrically connected by the wiring material 11. The wiring member 11 and the solar cell 10 are bonded by an adhesive layer 12. The bonding mode between the wiring member 11 and the solar cell 10 will be described in detail later.

The plurality of solar cells 10 are provided in the filler layer 13 filled between the first protective member 14 and the second protective member 15. The second protective member 15 is disposed on the light incident side of the solar cell 10. The 2nd protection member 15 can be comprised by translucent members, such as a glass plate and a plastic plate which have translucency, for example. The first protective member 14 is disposed on the back side of the solar cell 10. The 1st protection member 14 can be comprised by the resin film which interposed the resin film and metal foil, for example. The filler layer 13 can be composed of, for example, a resin such as ethylene / vinyl acetate copolymer (EVA) or polyvinyl butyral (PVB).

In addition, you may attach a frame to a peripheral part as needed. Further, a terminal box for taking out the output to the outside may be provided on the surface of the first protective member 14.

The solar cell 10 includes a photoelectric conversion unit 20. The photoelectric conversion unit 20 generates carriers such as electrons and holes when receiving light. For example, the photoelectric conversion unit 20 may include a substrate made of a semiconductor material such as silicon. Specifically, the photoelectric conversion unit 20 is arranged on a substrate made of a semiconductor material, one main surface of the substrate, a semiconductor layer having one conductivity type, and arranged on the other main surface of the substrate. And a semiconductor layer having another conductivity type. Further, the photoelectric conversion unit 20 is disposed on a substrate made of a semiconductor material, one principal surface side of the substrate, an impurity diffusion region having one conductivity type, and disposed on the other principal surface side of the substrate, An impurity diffusion region having another conductivity type may be provided. The surface layer of the photoelectric conversion unit 20 may be composed of a semiconductor layer or a transparent conductive layer. In addition, a transparent conductive layer can be comprised with translucent conductive oxides, such as an indium oxide containing a dopant, zinc oxide, and a tin oxide.

A first electrode 31 and a second electrode 32 are disposed on the photoelectric conversion unit 20. Specifically, the photoelectric conversion unit 20 has a first main surface 20c on the second protection member 15 side, and a second main surface 20d on the first protection member 14 side. The first main surface 20c is a light receiving surface of the photoelectric conversion unit 20, and the second main surface 20d is a back surface. The first electrode 31 is disposed on the first main surface 20 c of the photoelectric conversion unit 20. The second electrode 32 is disposed on the second main surface 20 d of the photoelectric conversion unit 20. One of the first electrode 31 and the second electrode 32 is an electrode that collects minority carriers, and the other is an electrode that collects majority carriers.

As shown in FIG. 2, the first electrode 31 includes a plurality of finger portions 31a and a plurality of bus bar portions 31b. The plurality of finger portions 31a extend in parallel to each other in one direction (y direction). The plurality of finger portions 31a are arranged in parallel to each other at a predetermined interval along another direction (x direction) intersecting with one direction. The plurality of finger portions 31a are electrically connected to the bus bar portion 31b. The bus bar portion 31b is provided so as to extend along the x direction.

As shown in FIG. 3, the second electrode 32 includes a plurality of finger portions 32a and a plurality of bus bar portions 32b. The plurality of finger portions 32a extend in parallel to each other in the y direction. The plurality of finger portions 32a are arranged in parallel to each other at a predetermined interval along the x direction intersecting with one direction. The plurality of finger portions 32a are electrically connected to the bus bar portion 32b. The bus bar portion 32b is provided so as to extend along the x direction.

The first electrode 31 disposed on the first main surface 20c serving as the light receiving surface is preferably smaller in area than the second electrode 32 in order to reduce light receiving loss.

In the present embodiment, an example in which each of the first electrode 31 and the second electrode 32 includes a plurality of finger portions 31a and 32a and bus bar portions 31b and 32b will be described. The shapes of the electrode 31 and the second electrode 32 are not particularly limited. Each of the first electrode 31 and the second electrode 32 may be a so-called busbarless electrode having only a plurality of finger portions, for example. The second electrode 32 may be a film-like electrode provided on substantially the entire second main surface 20d.

As illustrated in FIG. 4, the photoelectric conversion unit 20 includes a first transparent conductive layer 20 a on the first main surface 20 c side and a second transparent conductive layer 20 b on the second main surface 20 d side. . An insulating layer 21 is disposed on the first major surface 20c. A part of the first main surface 20 c is covered with the insulating layer 21. Specifically, the insulating layer 21 covers substantially the entire portion of the first major surface 20c where the first electrode 31 is not disposed. An opening 21 a is provided in the insulating layer 21. A part of the first main surface 20c of the photoelectric conversion unit 20 is exposed through the opening 21a, and the first electrode 31 is disposed on the exposed portion. That is, the first electrode 31 is disposed on the first main surface 20c of the photoelectric conversion unit 20 in the opening 21a. The insulating layer 21 has a portion thicker than the first electrode 31.

Specifically, the opening 21a includes a relatively narrow base end portion 21a1 provided on the photoelectric conversion unit 20 side and a relatively wide tip end portion 21a2 provided on the second protection member 15 side. Have. The first electrode 31 is disposed in the base end portion 21a1 and is in contact with the first main surface 20c. The position of the upper surface of the first electrode 31 is substantially equal to the position of the step surface 21a3 formed at the boundary between the base end portion 21a1 and the tip end portion 21a2.

The insulating layer 22 is disposed on the second main surface 20d. A part of the second main surface 20d is covered with the insulating layer 22. Specifically, the insulating layer 22 covers substantially the entire portion of the second main surface 20d where the second electrode 32 is not disposed. The insulating layer 22 is provided with an opening 22a. A part of the second main surface 20d of the photoelectric conversion unit 20 is exposed through the opening 22a, and the second electrode 32 is disposed on the exposed portion. That is, the second electrode 32 is disposed on the second main surface 20d of the photoelectric conversion unit 20 in the opening 22a. The insulating layer 22 has a portion thicker than the second electrode 32.

Specifically, the opening 22a includes a relatively narrow base end portion 22a1 provided on the photoelectric conversion unit 20 side and a relatively wide end portion 22a2 provided on the first protection member 14 side. Have. The second electrode 32 is disposed in the base end portion 22a1 and is in contact with the second main surface 20d. The position of the upper surface of the second electrode 32 is substantially equal to the position of the step surface 22a3 formed at the boundary between the base end portion 22a1 and the tip end portion 22a2.

The insulating layer 21 and the insulating layer 22 can be made of an appropriate insulating material. Examples of the insulating material preferably used as a constituent material of the insulating layer 21 and the insulating layer 22 include a resin and a metal oxide. Among these, a resin that is easily plastically deformed from the viewpoint of production is more preferably used as a constituent material of the insulating layer 21 and the insulating layer 22, and includes a polyester resin, an ethylene / vinyl acetate copolymer, an acrylic resin, an epoxy resin, and a urethane resin. At least one resin selected from the group is more preferably used as a constituent material of the insulating layer 21 and the insulating layer 22.

Hereinafter, the bonding mode between the wiring member 11 and the solar cell 10 will be described in detail. In addition, since the adhesion mode of the wiring material 11 and the solar cell 10 is basically the same on the first main surface 20c side and the second main surface 20d side of the photoelectric conversion unit 20, the first main surface 20c will be described below. The side adhesion mode will be described.

The wiring member 11 is arranged so that at least one end in the y direction which is the width direction of the wiring member 11 is positioned on the insulating layer 21. Specifically, in the solar cell module 1, the wiring member 11 is arranged so that both ends in the y direction are positioned on the insulating layer 21. In other words, the wiring member 11 is arranged so as to straddle the insulating layer 21 on the other side from the insulating layer 21 on the one side in the y direction of the opening 21a. Specifically, the wiring member 11 has a central portion 11a, an end portion 11b, and an end portion 11c in the width direction. The central part 11a is located in the central part in the y direction. The central part 11 a is located on the electrode 31. The central portion 11 a is connected to the upper surface of the electrode 31 by the adhesive layer 12. The end portion 11b and the end portion 11c are located on both sides in the y direction of the central portion 11a. The end portion 11 b and the end portion 11 c are located on the insulating layer 21.

The wiring member 11 is at least partially embedded in the opening 21a on the photoelectric conversion unit 20 side. Specifically, the electrode 31 is embedded in the base end portion 21a1 of the opening 21a. A part of the wiring member 11 on the photoelectric conversion unit 20 side is embedded in the tip 21a2 of the opening 21a. The end 11b and the end 11c of the wiring member 11 are bonded on the step surface 21a3 by the adhesive layer 12.

As described above, in the solar cell module 1, at least one end in the width direction of the wiring member 11 is located on the insulating layer 21, and a part of the wiring member 11 is disposed in the opening 21a. The central portion 11a is electrically connected to the electrode 31. Specifically, the wiring material 11 has both end portions in the y direction which is the width direction positioned on the insulating layer 21. For this reason, the side surface of the electrode 31 is covered with the insulating layer 21, and the upper surface of the electrode 31 is covered with the wiring material 11. In other words, the entire surface of the electrode 31 is surrounded and sealed by the insulating layer 21 and the wiring material 11. Therefore, the insulating layer 21 and the wiring material 11 prevent moisture from entering the electrode 31. For this reason, it is possible to suppress an adverse effect such as an increase in the electrical resistance of the electrode 31 caused by the penetration of moisture. Moreover, it is suppressed that a water | moisture content permeates into the interface of the electrode 31 and the photoelectric conversion part 20. FIG. As a result, an increase in contact resistance between the electrode 31 and the photoelectric conversion unit 20 due to moisture can be suppressed. Therefore, improved reliability can be realized.

In particular, in the solar cell module 1, at least a part of the wiring material 11 is embedded in the opening 21a. Accordingly, since the moisture intrusion path for reaching the electrode 31 can be lengthened, it is possible to more effectively suppress a decrease in reliability due to moisture.
In addition, since the adhesive layer 12 is also disposed between the wiring member 11 and the insulating layer 21, it is more effective for moisture to enter the electrode 31 via the wiring member 11 and the insulating layer 21. Is suppressed. In addition, the bonding strength of the wiring material 11 to the solar cell 10 is increased by bonding the wiring material 11 to the insulating layer 21 as well. Therefore, further improved reliability can be realized.

From the viewpoint of more effectively suppressing the intrusion of moisture into the region where the electrode 31 is provided, both ends of the wiring material 11 in the width direction y are insulating layers 21 as in the present embodiment. It is preferable to arrange so that it is located on the top. However, in the present invention, the wiring member may be arranged so that one end in the width direction is positioned on the insulating layer. Even in such a case, the cross-sectional area of the moisture intrusion path between the wiring member and the insulating layer can be reduced and the moisture intrusion path can be lengthened. Accordingly, it is possible to suppress a decrease in reliability due to moisture intrusion.

The ratio of the width direction dimensions of the end portions 11b and 11c to the width direction dimension of the wiring material 11 ((width direction dimensions of the end portions 11b and 11c) / (width direction size of the wiring material 11)) is 0.08 to It is preferably 0.75, and more preferably 0.3 to 0.5. The width of the wiring member 11 is preferably 0.2 mm or more larger than the width of the bus bar portions 31b and 32b, and more preferably 0.4 mm or more.

The wiring member 11 and the solar cell 10 are bonded by an adhesive layer 12. The adhesive layer 12 may be made of, for example, solder or the like, but may be constituted by a resin adhesive layer containing a cured product of a resin adhesive. By doing in this way, since the adhesive strength of the wiring material 11 with respect to the insulating layer 21 can be raised, the adhesive strength with respect to the solar cell 10 of the wiring material 11 can be raised. Specifically, the adhesive layer 12 includes a plurality of conductive materials and a cured product of a resin adhesive. But the adhesive layer 12 may consist only of the hardened | cured material of a resin adhesive. However, in that case, the wiring member 11 and the electrode 31 need to be in direct contact with each other at least partially.

The configuration of the wiring material 11 is not particularly limited. The wiring member 11 can be made of an appropriate conductive material such as a metal such as Cu or Ag or an alloy. The wiring material 11 may have a solder coat layer. Moreover, the wiring material 11 may have an uneven surface.

Next, an example of a method for manufacturing the solar cell module 1 will be described.

First, the photoelectric conversion unit 20 is prepared. The photoelectric conversion unit 20 can be produced by, for example, a known method.

Next, as shown in FIG. 5, the insulating layer 21 having the opening 21 b is formed on the first main surface 20 c of the photoelectric conversion unit 20. The insulating layer 21 can be formed, for example, by forming an insulating film over the entire first main surface 20c of the photoelectric conversion unit 20 and forming an opening 21b in the insulating film. For example, first, a resist film is formed in a portion where the opening 21b is to be formed, then an insulating film is formed, and finally the resist film is removed by lift-off to form the insulating layer 21 having the opening 21b. can do. Similarly, the insulating layer 22 having the opening 22b is formed on the second main surface 20d of the photoelectric conversion unit 20.

Next, the first electrode 31 is formed in the opening 21b of the insulating layer 21 by plating using the insulating layer 21 and the insulating layer 22 as a mask, and at the same time, the second electrode 32 is formed in the opening 22b of the insulating layer 22. The solar cell 10 is completed by forming. At this time, the first electrode 31 is not formed so as to fill the entire opening 21b. Similarly, the second electrode 32 is not formed so as to fill the entire opening 22b.

In this embodiment, the insulating layer 21 and the insulating layer 22 function as a mask for plating. Therefore, the first electrode 31 and the second electrode 32 having a desired shape can be formed with high shape accuracy. In addition, when the first electrode 31 and the second electrode 32 are formed by plating, it is not necessary to separately provide a mask and it is not necessary to remove the mask after plating. For this reason, the manufacturing process of the solar cell module 1 can be simplified.

Next, the plurality of solar cells 10 are electrically connected by the wiring material 11. Specifically, first, the adhesive 12 a is disposed on at least one of the surface of the wiring member 11 on the solar cell 10 side and the surface of the first electrode 31 of the solar cell 10. Similarly, the adhesive 12 a is disposed on at least one of the surface of the wiring member 11 on the solar cell 10 side and the surface of the second electrode 32 of the solar cell 10. Next, the wiring member 11 is arranged so that at least one end in the y direction which is the width direction is positioned on the insulating layer 21 and a part thereof is positioned on the opening 21b. Similarly, the wiring member 11 is disposed such that at least one end in the y direction which is the width direction is located on the insulating layer 22 and a part thereof is located on the opening 22b. Next, the portions of the insulating layer 21 and the insulating layer 22 located under the wiring member 11 are deformed by pressing the front and back wiring members 11 against the solar cell 10, and at least a part of the wiring member 11 is changed to the insulating layer. 21 and the insulating layer 22. This pressing step is performed while heating. By doing so, the adhesive agent 12a is hardened, the wiring material 11 and the solar cell 10 are bonded together and electrically connected.

Thereafter, the plurality of solar cells 10 electrically connected by the wiring material 11 are sealed with the filler layer 13 between the first protective member 14 and the second protective member 15. Specifically, for example, a resin sheet such as an EVA sheet is placed on the second protective member 15. A plurality of solar cells 10 are arranged on the resin sheet. A resin sheet such as an EVA sheet is placed thereon, and the first protective member 14 is placed thereon. The solar cell module 1 can be completed by laminating these by thermocompression bonding in a reduced pressure atmosphere.

As described above, in the present embodiment, the step of connecting the wiring member 11 to the solar cell 10 is performed by arranging at least one end in the width direction of the wiring member 11 on the insulating layer 21 and the insulating layer 22. The pressure is applied to the material 11 and the solar cell 10 to deform the insulating layer 21 and the insulating layer 22. For this reason, the stress added between the wiring material 11 and the solar cell 10 is relieved by the deformation of the insulating layer 21 and the insulating layer 22. Therefore, it is possible to suppress a large stress from being applied to the solar cell 10. Therefore, damage to the solar cell 10 can be suppressed, and the yield of the solar cell module 1 can be increased.

In particular, in this embodiment, a resin adhesive is used, and the bonding between the wiring member 11 and the solar cell 10 is performed while heating. For this reason, the insulating layer 21 and the insulating layer 22 made of resin are easily deformed. In particular, when the insulating layer 21 and the insulating layer 22 are made of at least one resin selected from the group consisting of a polyester resin, an ethylene / vinyl acetate copolymer, an acrylic resin, an epoxy resin, and a urethane resin, the insulating layer 21 In addition, the insulating layer 22 is more easily deformed. Therefore, the stress relaxation effect due to the deformation of the insulating layer 21 and the insulating layer 22 is greatly achieved. As a result, damage to the solar cell 10 can be more effectively suppressed.

Note that the bonding of the wiring material 11 to the main surface on one side of the solar cell 10 and the bonding of the wiring material 11 to the main surface on the other side may be performed separately, but are preferably performed simultaneously. By doing so, the stress added to the solar cell 10 can be made smaller. Moreover, it can suppress that the curvature of the solar cell 10 resulting from the thermal expansion coefficient difference between the wiring material 11 and the solar cell 10 generate | occur | produces.

In the present embodiment, an example in which both end portions in the width direction of the wiring material 11 are arranged on the insulating layers 21 and 22 to perform pressure bonding between the wiring material 11 and the solar cell 10 has been described. One end portion in the width direction may be arranged on the insulating layer 21 and the insulating layer 22 and the wiring member 11 and the solar cell 10 may be pressure-bonded. Even in that case, the stress relaxation effect described above can be obtained. Therefore, damage to the solar cell 10 can be suppressed.

Hereinafter, another example of the preferred embodiment of the present invention will be described. In the following description, members having substantially the same functions as those of the first embodiment are referred to by the same reference numerals, and description thereof is omitted.

(Second Embodiment)
In the solar cell module 1 according to the first embodiment, an example in which at least one end in the width direction of the wiring member 11 is positioned on the insulating layers 21 and 22 on both main surface sides of the solar cell 10. Explained. On the other hand, in the solar cell module 2 according to the present embodiment, as shown in FIG. 6, at one main surface side of the solar cell 10, at least one end in the y direction that is the width direction of the wiring member 11. The part is located on the insulating layer 21. On the other hand, the wiring member 11 is not disposed on the insulating layer 22 on the other main surface side of the solar cell 10. Even in such a configuration, it is possible to suitably suppress the intrusion of moisture into the region where the first electrode 31 is provided. Therefore, improved reliability can be realized.

Also in this embodiment, it is possible to reduce the stress applied to the solar cell 10 when the wiring member 11 is crimped to the solar cell 10. Therefore, damage to the solar cell 10 can be suppressed.

Specifically, the solar cell module 2 is disposed so as to mainly receive light on the main surface of the solar cell 10 on the first electrode 31 side. The first electrode 31 is narrower than the second electrode 32 from the viewpoint of increasing the light receiving efficiency on the main surface of the solar cell 10 on the first electrode 31 side. Specifically, the first electrode 31 is provided narrower than the wiring material 11, while the second electrode 32 is provided wider than the wiring material 11.

In the solar cell module 2, the insulating layer 21 and the wiring material 11 prevent moisture from entering the region where the first electrode 31 having a relatively narrow width and a relatively high electrical resistance is provided. . Therefore, improved reliability can be realized.

(Third embodiment)
In the solar cell module 1 according to the first embodiment, the example in which each of the first and second electrodes 31 and 32 includes the bus bar portions 31b and 32b and the plurality of finger portions 31a and 32a has been described. On the other hand, in the solar cell module 3 according to the present embodiment, as shown in FIG. 7, the second electrode 32 is provided in a planar shape, and the insulating layer 22 is not provided. Even in such a case, improved reliability can be obtained, and damage to the solar cell 10 when the wiring member 11 is crimped can be suppressed.

In addition, the formation method of the planar 2nd electrode 32 is not specifically limited. The second electrode 32 can be formed by, for example, a screen printing method, a plating method, a vapor deposition method, a sputtering method, or the like.

Further, a terminal portion for adhering the wiring material 11 may be further provided on the planar second electrode 32.

(Fourth embodiment)
In the solar cell modules 1 to 3 according to the first to third embodiments, the opening 21a of the insulating layer 21 has a narrow base end 21a1 and a wide front end 21a2, and the wiring member 11 is provided in the front end 21a2. The form in which is embedded is described. On the other hand, in the solar cell module 4 according to the present embodiment, as shown in FIG. 8, the opening 21a has substantially the same width along the thickness direction, while the wiring member 11 is on the base 11A and the photoelectric conversion unit 20 side. And a projecting portion 11B projecting to the surface. The base portion 11A is located on the upper surface of the insulating layer 21, and the convex portion 11B is embedded in the opening 21a.

In addition, such a connection aspect can be manufactured by using the wiring material 11 which is more easily deformed than the insulating layer 21 and the insulating layer 22 and deforming the wiring material 11 when the wiring material 11 is crimped to the solar cell 10. it can.

Also in the solar cell module 4, improved reliability can be obtained, and damage to the solar cell 10 when the wiring member 11 is crimped can be suppressed.

(Fifth embodiment)
In the solar cell module 5 according to the present embodiment, as shown in FIG. 9, the opening 21 a of the insulating layer 21 has a narrow base end 21 a 1 and a wide front end 21 a 2, and the wiring material 11 has a base 11 A. And a convex portion 11B protruding toward the photoelectric conversion portion 20 side. Then, the base portion 11A of the wiring member 11 is embedded in the distal end portion 21a2, and the convex portion 11B is embedded in the proximal end portion 21a1.

In addition, such an aspect can be manufactured by deforming both the wiring material 11, the insulating layer 21, and the insulating layer 22 when the wiring material 11 is crimped to the solar cell 10. Even in such a case, improved reliability can be obtained, and damage to the solar cell 10 when the wiring member 11 is crimped can be suppressed.

(Sixth embodiment)
In the solar cell module 6 according to the present embodiment, as shown in FIG. 10, the adhesive layer 12 is also disposed between the wiring member 11 and the insulating layers 21 and 22, and the side surface 11 d of the wiring member 11. , 11e. For this reason, it is possible to more effectively suppress moisture from entering the electrodes 31 and 32 via the wiring material 11 and the insulating layers 21 and 22. Moreover, the adhesive strength between the wiring member 11 and the solar cell 10 is increased. Therefore, further excellent reliability can be realized.

In such an embodiment, in the bonding process, a resin adhesive is arranged between the wiring material 11 and the solar cell 10, and the wiring is performed so that the resin adhesive also straddles the side surfaces 11 d and 11 e of the wiring material 11. It can be obtained by bonding the wiring material 11 and the solar cell 10 by curing the resin adhesive in a state where the material 11 is pressed against the solar cell 10.

(Seventh embodiment)
In the solar cell module 7 according to this embodiment, as shown in FIG. 11, the adhesive layer 12 extends over the surface of the portion where the wiring material 11 of the insulating layers 21 and 22 is not provided on the upper portion. Is arranged. Further, the adhesive layer 12 is different from the solar cell module 6 according to the sixth embodiment in that the adhesive layer 12 extends over a region located on the upper surface of the insulating layers 21 and 22 on the side surface of the wiring member 11. For this reason, in the solar cell module 7, the penetration of moisture into the electrodes 31 and 32 via the space between the wiring member 11 and the insulating layers 21 and 22 is more effectively suppressed than in the solar cell module 6. Yes. Moreover, the adhesive strength between the wiring member 11 and the solar cell 10 is further increased. Therefore, further excellent reliability can be realized.

The present invention includes various embodiments that are not described here. For example, a recess in which at least a part of the wiring material enters the insulating layer may be formed in advance, and the wiring material may be inserted into the recess in the crimping process of the wiring material.

Alternatively, a convex portion may be formed in advance on a part of the wiring material, and this convex portion may be inserted into the opening of the insulating layer.

Also, solder may be used for bonding the wiring material and the solar cell. In this case, the wiring material may be provided with a solder coat layer, and the wiring material may be heated to a high temperature until the solder coat layer is dissolved in the wiring material crimping step.

The electrode may be formed by a method other than the plating method.

The bus bar part may be provided in a zigzag shape.

As described above, the present invention includes various embodiments not described herein. 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 1-5 ... Solar cell module 10 ... Solar cell 11 ... Wiring material 11a ... Center part 11b, 11c ... End part 12 ... Adhesive layer 20 ... Photoelectric conversion part 20a, 20b ... Transparent conductive layer 21,22 ... Insulating layer 21a, 22a ... Openings 21a1, 22a1 ... Base end parts 21a2, 22a2 ... Tip part 31 ... First electrode 32 ... Second electrodes 31a, 32a ... Finger parts 31b, 32b ... Busbar part

Claims (12)

Solar cells,
A wiring material electrically connected to the solar cell;
With
The solar cell is
A photoelectric conversion unit;
An insulating layer covering a part of the surface of the photoelectric conversion unit and having an opening exposing the photoelectric conversion unit;
An electrode that is disposed on the surface of the photoelectric conversion portion in the opening and has a thickness smaller than that of the insulating layer;
Have
The wiring member has at least one end in the width direction positioned on the insulating layer, and is disposed in the opening, and has a portion electrically connected to the electrode. A solar cell module provided. The solar cell module according to claim 1,
Both end portions in the width direction of the wiring member are located on the insulating layer. The solar cell module according to claim 1 or 2,
It further includes an adhesive layer that adheres the wiring member and the solar cell. The solar cell module according to claim 3, wherein
The adhesive layer is disposed between the wiring material and the insulating layer. The solar cell module according to claim 4,
The adhesive layer is disposed across the side surface of the wiring member. A photoelectric conversion unit, covering a part of the surface of the photoelectric conversion unit, an insulating layer having an opening exposing the photoelectric conversion unit, and disposed on the surface of the photoelectric conversion unit in the opening; Preparing a solar cell having an electrode having a thickness smaller than that of the insulating layer;
The wiring member is disposed such that at least one end in the width direction is located on the insulating layer and a part is located in the opening, and the wiring member is electrically connected to the electrode. An adhesion process for adhering to a solar cell;
A method for manufacturing a solar cell module. It is a manufacturing method of the solar cell module according to claim 6,
In the bonding step, at least one of the wiring material and the insulating layer is deformed and bonded while pressing the wiring material against the solar cell so that at least a part of the wiring material is embedded in the opening. It is a manufacturing method of the solar cell module according to claim 7,
In the bonding step, an adhesive containing a resin is disposed between the wiring material and the solar cell, and the wiring material is attached to the solar cell so that the adhesive also straddles a side surface of the wiring material. The wiring material and the solar cell are bonded by curing the resin contained in the adhesive in a pressed state. A method for producing a solar cell module according to any one of claims 6 to 8,
The bonding step is performed while heating. A method for manufacturing a solar cell module according to any one of claims 6 to 9,
In the preparation step, the insulating layer is formed of a resin. It is a manufacturing method of the solar cell module according to claim 10,
In the preparation step, the insulating layer is formed of at least one resin selected from the group consisting of a polyester resin, an ethylene / vinyl acetate copolymer, an acrylic resin, an epoxy resin, and a urethane resin. A method for manufacturing a solar cell module according to any one of claims 6 to 11,
In the preparation step, the electrode is formed by plating using the insulating layer as a mask.

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