Solar cell modules and wiring components

Abstract

The present invention provides a wiring member and a solar cell module equipped with the wiring member that can suppress delamination from the solar cell panel due to thermal stress generated between the solar cell panel and the wiring pattern. [Solution] The wiring member has a wiring pattern formed on an insulating substrate, which includes a main wiring section extending in a first direction, a first connecting wiring section extending from the main wiring section in a direction intersecting the first direction, and a second connecting wiring section extending from the main wiring section in a direction intersecting the first connecting wiring section at a distance from the first connecting wiring section. The solar cell panel is connected to the first connecting wiring section by a first conductive adhesive and to the second connecting wiring section by a second conductive adhesive. When viewed from above, the wiring member has a configuration in which at least one of the following areas—a first overlapping section where the first connecting wiring section and the insulating substrate overlap, a second overlapping section where the second connecting wiring section and the insulating substrate overlap, and the area between the first and second overlapping sections—has a stress-relieving section that can move or deform with at least a component in the first direction.

Description

Technical Field

[0001] The present invention relates to a solar cell module and a wiring member.

Background Art

[0002] In recent years, a solar cell module for a window that regularly arranges solar cell panels and collects light from the gaps between adjacent solar cell cells is known (for example, Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, in a conventional solar cell module, a metal wiring member is connected to a current collecting electrode of a solar cell panel using a conductive adhesive such as solder, and electricity is taken out from the solar cell panel to the outside. Since the solar cell panel and the wiring member have significantly different coefficients of thermal expansion, when heated to a high temperature due to heat treatment during the manufacture of the solar module or heat generation during power generation, thermal stress occurs between the current collecting electrode of the solar cell panel and the wiring member, and the wiring member may peel off from the current collecting electrode of the solar cell panel due to the thermal stress, and there has been room for further improvement in the wiring member.

[0005] Therefore, an object of the present invention is to provide a wiring member capable of suppressing peeling from a solar cell panel due to thermal stress generated between the solar cell panel and a wiring pattern, and a solar cell module including the wiring member.

Means for Solving the Problems

[0006] One aspect of the present invention for solving the above-mentioned problems is a solar cell module comprising a solar cell panel and a wiring member, wherein the wiring member has a wiring pattern formed on an insulating substrate, the wiring pattern has a main wiring portion extending in a first direction, a first connecting wiring portion extending from the main wiring portion in a direction intersecting the first direction, and a second connecting wiring portion extending from the main wiring portion in the intersecting direction at a distance from the first connecting wiring portion, the solar cell panel being connected to the first connecting wiring portion by a first conductive adhesive and to the second connecting wiring portion by a second conductive adhesive, and the wiring member having, when viewed from above, a stress-relieving portion that can move or deform in at least one of the following: a first overlapping portion where the first connecting wiring portion and the insulating substrate overlap, a second overlapping portion where the second connecting wiring portion and the insulating substrate overlap, and a portion between the first and second overlapping portions, wherein the wiring member has a stress-relieving portion that can move or deform in at least the first direction component.

[0007] According to this configuration, since the solar panel and the wiring pattern are connected by multiple connection points, even if heat is generated, the thermal stress caused by the difference in thermal expansion coefficients between the solar panel and the wiring pattern can be distributed more effectively compared to the case where they are connected by only one connection point. According to this aspect, when viewed from above, the wiring member has a stress-relieving portion that can move or deform in a first direction component in at least one of the first superimposed portion, the second superimposed portion, and the portion between the first superimposed portion and the second superimposed portion. Therefore, even if heat is generated, the thermal stress caused by the difference in thermal expansion coefficients between the solar cell panel and the wiring pattern can be relieved. Thus, according to this configuration, even if heat is generated, the thermal stress caused by the difference in thermal expansion coefficients between the solar cell panel and the wiring pattern can be mitigated and dispersed, thereby suppressing the peeling of the wiring pattern due to thermal stress.

[0008] A preferred configuration is that, when viewed from above, the stress-relaxing portion is located between the first and second superimposed portions and is more easily deformable than the first and second superimposed portions.

[0009] A preferred configuration is one in which the first connecting wiring section and the second connecting wiring section extend parallel to each other.

[0010] A preferred configuration is that the width of the main wiring section is greater than the width of the first connecting wiring section.

[0011] A preferred configuration is that, when viewed from above, the wiring member has a slit portion extending in the intersecting direction between the first overlapping portion and the second overlapping portion.

[0012] A preferred feature is that the insulating substrate is flexible.

[0013] A preferred configuration is that the first connecting wiring section has a planar connecting section and an intermediate wiring section, the intermediate wiring section connects the planar connecting section and the main wiring section, and for most of the intersecting direction, its width is less than or equal to the minimum width of the planar connecting section, and the solar cell panel is connected to the planar connecting section of the first connecting wiring section by a first conductive adhesive.

[0014] In this context, "the majority" refers to the portion exceeding 50% of the whole.

[0015] One aspect of the present invention is a wiring member connectable to a solar cell panel, having a wiring pattern on an insulating substrate, wherein the wiring pattern, when connected to the solar cell panel, has a main wiring portion extending in a first direction, a first connecting wiring portion extending from the main wiring portion in a direction intersecting the first direction, and a second connecting wiring portion extending from the main wiring portion in the intersecting direction at a distance from the first connecting wiring portion, wherein the first connecting wiring portion is connected to the solar cell panel by a first conductive adhesive when connected to the solar cell panel, and the second connecting wiring portion is connected to the solar cell panel by a second conductive adhesive, and when viewed from above, there is a stress-relieving portion that is movable or deformable in at least one of the following: a first overlapping portion where the first connecting wiring portion and the insulating substrate overlap, a second overlapping portion where the second connecting wiring portion and the insulating substrate overlap, and a portion between the first and second overlapping portions.

[0016] According to this aspect, since the wiring pattern can be connected to the solar cell panel by a plurality of connection wiring portions, even if heat is generated, the thermal stress generated by the difference in the coefficient of thermal expansion between the solar cell panel and the wiring pattern can be dispersed. According to this aspect, the wiring member has a stress relaxation portion that can move or deform with a first direction component in at least any one of the first overlapping portion, the second overlapping portion, and the portion between the first overlapping portion and the second overlapping portion when viewed in plan. Therefore, even if heat is generated, the thermal stress generated by the difference in the coefficient of thermal expansion between the solar cell panel and the wiring pattern can be relaxed. As described above, according to this aspect, when connected to the solar cell panel, even if heat is generated, the thermal stress generated by the difference in the coefficient of thermal expansion between the solar cell panel and the wiring pattern can be relaxed and dispersed, so that the peeling of the wiring pattern due to the thermal stress can be suppressed.

[0017] As long as the above-described aspects are included in the technical scope of the present invention, the aspects can be made mutually dependent, a part of the configuration can be cited, or a part of the configuration can be replaced among the aspects.

Effect of the Invention

[0018] According to the solar cell module and the wiring member of the present invention, even if heat is generated, peeling from the solar cell panel due to thermal stress generated between the solar cell panel and the wiring pattern can be suppressed.

Brief Description of the Drawings

[0019] [Figure 1] It is an exploded perspective view of a solar cell module according to a first embodiment of the present invention. [Figure 2] It is a front view of the solar cell module of FIG. 1, and the first sealing member is omitted for easy understanding. [Figure 3] It is an exploded perspective view of a main part of the solar cell module of FIG. 1. [Figure 4] It is an exploded perspective view of the wiring member of FIG. 3. [Figure 5]It is a cross-sectional view taken along the line A-A of the solar cell module shown in FIG. 2. [Figure 6] It is an explanatory view of the solar cell shown in FIG. 3. (a) is a perspective view of the solar cell, and (b) is a perspective view obtained by rotating the solar cell in (a) 180 degrees in the R direction. [Figure 7] It is an explanatory view showing the relationship between the solar cell string and the wiring member in FIG. 2. (a) is a plan view of the solar cell string and the wiring member, and (b) is an enlarged view of the B region in (a). [Figure 8] It is an explanatory view of the wiring member according to another embodiment of the present invention, and is a perspective view of the main part of the wiring member having a slit portion. [Figure 9] It is an explanatory view of the wiring member according to another embodiment of the present invention. (a) is a plan view of an embodiment having a trapezoidal planar connection portion of the wiring member, and (b) is a plan view of an embodiment having a rounded square planar connection portion of the wiring member.

Mode for Carrying Out the Invention

[0020] Hereinafter, embodiments of the present invention will be described in detail.

[0021] The solar cell module 1 according to the first embodiment of the present invention is a plate-shaped module having a first main surface 4a and a second main surface 4b as shown in FIG. 1, and is a sheet-through type solar cell module capable of transmitting light in the thickness direction. Further, the solar cell module 1 is preferably used for building materials such as windows, and is a double-sided light-receiving type solar cell module in which both the first main surface 4a and the second main surface 4b can be light-receiving surfaces. In the following description, a case where the solar cell module 1 is used for a window of a room and the first main surface 4a is installed on the outdoor side and the second main surface 4b is installed indoors will be described. In the following description, the solar cell module 1 has a first main surface 4a as a light-receiving surface for receiving sunlight.

[0022] As shown in Figures 1 and 2, the solar cell module 1 comprises a solar cell string 2, wiring members 3 (3a, 3b), wiring outlets 5a, 5b, a first sealing member 6, a second sealing member 7, and terminal boxes 8a, 8b.

[0023] <Solar String 2> As shown in Figure 5, the solar cell string 2 is a series panel group in which one or more solar cell panels 20 are electrically connected in series either directly or via a conductive adhesive 21, and the direction of electricity flow during power generation is unidirectional.

[0024] As shown in Figure 6, the solar cell panel 20 is a rectangular plate-shaped panel with four sides 22-25 when viewed from above. A first collector electrode 26 is provided on one main surface 28, and a second collector electrode 27 is provided on the other main surface 29.

[0025] As shown in Figure 6(a), the first collecting electrode 26 comprises a first busbar electrode section 30 and a plurality of first finger electrode sections 31. The first busbar electrode portion 30 is an electrode portion that has width in the direction of extension of the short sides 24 and 25 in the vicinity of the long side 22, and extends along the long side 22.

[0026] The first finger electrode portion 31 is an electrode portion that extends from the first busbar electrode portion 30 toward the long side 23, and has width in the direction of extension of the long sides 22 and 23, and length along the short sides 24 and 25. In other words, the first finger electrode portion 31 extends in a direction intersecting (orthogonal to) the direction of extension of the first busbar electrode portion 30. The width of the first finger electrode portion 31 is preferably smaller than the width of the first busbar electrode portion 30. Each first finger electrode portion 31 is arranged at substantially equal intervals in the direction of extension of the long sides 22 and 23. In this context, "effectively equal intervals" means that the absolute value of the difference between one interval and the other interval is 5% or less of the value of the other interval. The same applies hereafter.

[0027] The second collecting electrode 27 is an electrode opposite to the first collecting electrode 26, and as shown in Figure 6(b), it comprises a second busbar electrode section 40 and a plurality of second finger electrode sections 41. The second busbar electrode portion 40 is an electrode portion that has width in the direction of extension of the short sides 24 and 25 in the vicinity of the long side 23, and extends along the long side 23.

[0028] The second finger electrode portion 41 is an electrode portion that extends from the second busbar electrode portion 40 toward the long side 22, and has width in the direction of extension of the long sides 22 and 23, and length along the short sides 24 and 25. In other words, the second finger electrode portion 41 extends in a direction intersecting (orthogonal) to the direction of extension of the second busbar electrode portion 40. The width of the second finger electrode portion 41 is preferably smaller than the width of the second busbar electrode portion 40. Each second finger electrode portion 41 is arranged at substantially equal intervals in the direction of extension of the long sides 22 and 23.

[0029] In this embodiment, as shown in Figure 5, the solar cell string 2 is connected between adjacent solar cells 20, 20 with an overlapping portion between the first busbar electrode portion 30 of the collector electrode 26 and the second busbar electrode portion 40 of the collector electrode 27 (a so-called single-ring connection).

[0030] The conductive adhesive 21 is a conductive member having conductivity, and as shown in Figure 5, it is an adhesive that connects the busbar electrode portions 30, 40 of adjacent solar cell panels 20, 20, or the ends of the solar cell string 2, to the wiring members 3a, 3b. The conductive adhesive 21 can be, for example, a conductive paste.

[0031] <Wiring component 3> The wiring component 3 is a component that extracts power from each solar cell string 2 to the outside, and is a flexible wiring substrate that is flexible in the thickness direction. As shown in Figure 4, the wiring member 3 comprises an insulating substrate 50, a plurality of wiring patterns 51 (51a to 51c), a marker portion 54, and conductive wiring 55, with the conductive wiring 55 connecting adjacent wiring patterns 51, 51 in the vertical direction Y. As shown in Figure 7, the wiring member 3 includes a pattern overlapping section 56 where the insulating substrate 50 and the wiring pattern 51 overlap, a conductive overlapping section 57 where the insulating substrate 50 and the conductive wiring 55 overlap, and a non-overlapping section 58 where only the insulating substrate 50 is located.

[0032] (Insulating substrate 50) The insulating substrate 50 is an insulating sheet with insulating properties, and as shown in Figure 4, it has a planar shape. The insulating substrate 50 in this embodiment is a flexible sheet that is soft and elastically deformable so as to follow the deformation of the wiring pattern 51 due to thermal shrinkage or the like. The insulating substrate 50 is preferably colored and exhibits a different color from the wiring pattern 51, and more preferably black or white. When viewed from above, the insulating substrate 50 has a vertically elongated rectangular shape with a width in the horizontal direction X (first direction) and a length in the vertical direction Y (second direction). From the viewpoint of stress relief, it is preferable that the insulating substrate 50 has a tensile elongation of 50% or more. The thickness of the insulating substrate 50 is preferably 100 μm or less, and more preferably 50 μm or less, from the viewpoint of stress relief.

[0033] (Wiring pattern 51) As shown in Figure 4, the wiring pattern 51 is formed in an island shape on the insulating substrate 50 and is wiring that connects each solar cell string 2 in parallel. The wiring pattern 51 is preferably made of a solder-plated conductive material, and more preferably has a conductive material coated or printed on it. The wiring pattern 51 may be made of conductive metal foil. As shown in Figure 4, the wiring pattern 51 includes a main wiring section 52 and a connecting wiring section 53.

[0034] The main wiring section 52 is a conductive wiring that has width in the horizontal direction X and length in the vertical direction Y, as shown in Figure 4. The width W1 of the main wiring section 52 shown in Figure 4 is preferably greater than or equal to the width W2 of the connecting wiring section 53, and preferably greater than the width W2 of the connecting wiring section 53.

[0035] As shown in Figure 4, the connecting wiring section 53 is a conductive wiring that has a width in the vertical direction Y and extends from the main wiring section 52 with a length in the horizontal direction X, and is a connecting wiring that connects the corresponding solar cell string 2 to the main wiring section 52. Each connecting wiring section 53 is spaced apart in the vertical direction Y and extends parallel to each other. The spacing D1 between adjacent connecting wiring sections 53, 53 in the vertical direction Y, as shown in Figure 4, is substantially equal. The spacing D1 between the connecting wiring sections 53, 53 of the wiring pattern 51 is preferably equal to the distance D2 between each wiring pattern 51, 51.

[0036] (Marker section 54) The marker section 54 is a part that identifies the position coordinates of the wiring member 3 and is a part that adjusts the angle and position of the wiring member 3. The marker portion 54 is formed on the insulating substrate 50 and is positioned so as not to overlap with the wiring pattern 51 when viewed from above. In this embodiment, the marker portion 54 is located near a corner when viewed from above, and is located outside the main wiring portion 52 of the wiring pattern 51 in the lateral direction X.

[0037] (Conductive wiring 55) The conductive wiring 55 is a conductor that connects the main wiring sections 52, 52 of adjacent wiring patterns 51, 51. The conductive wiring 55 in this embodiment is a flexible conductive film that can elastically deform to follow the deformation of the wiring pattern 51 due to thermal shrinkage or the like.

[0038] (Pattern superimposed section 56) As shown in Figure 7, the pattern overlapping section 56 is the region where the insulating substrate 50 and the wiring pattern 51 overlap when viewed from above, and is composed of a main overlapping section 70 where the insulating substrate 50 and the main wiring section 52 overlap, and a connection overlapping section 71 where the insulating substrate 50 and the connection wiring section 53 overlap. In this embodiment, since both the insulating substrate 50 and the wiring pattern 51 are flexible, even if thermal stress occurs between the solar cell panel 20 and the connecting wiring portion 53 of the wiring pattern 51 due to thermal shrinkage or the like, the thermal stress can be relieved by deformation.

[0039] (Conductive superimposed portion 57) The conductive superposition area 57 is the region where the insulating substrate 50 and the conductive wiring 55 overlap when viewed from above, as shown in Figure 7. In this embodiment, since both the insulating substrate 50 and the conductive wiring 55 of the conductive superimposed portion 57 are flexible, even if thermal stress occurs between the solar cell panel 20 and the connecting wiring portion 53 of the wiring pattern 51 due to thermal contraction or the like, the thermal stress can be relieved by deformation.

[0040] (Non-overlapping portion 58) The non-overlapping area 58 is, as shown in Figure 7, the area other than the pattern overlapping area 56 and the conductive overlapping area 57 when viewed from above, and is the area where the insulating substrate 50 does not overlap the wiring pattern 51 and the conductive wiring 55, and is exposed from the wiring pattern 51 and the conductive wiring 55. In this embodiment, the non-overlapping portion 58 is flexible because the insulating substrate 50 is flexible. Therefore, even if thermal stress occurs between the solar cell panel 20 and the connecting wiring portion 53 of the wiring pattern 51 due to thermal shrinkage or the like, the thermal stress can be relieved by deformation.

[0041] Thus, in this embodiment, the wiring member 3 has a flexible pattern superimposed portion 56, a conductive superimposed portion 57, and a non-superimposed portion 58, all of which function as stress relief portions.

[0042] <Wiring output wiring 5a, 5b> The wiring outlets 5a and 5b are wires that electrically connect the wiring patterns 51 of the wiring members 3a and 3b to the terminal boxes 8a and 8b, as shown in Figures 2 and 3. The wiring outlets 5a and 5b have one end connected to the main wiring sections 52 and 52 of the wiring members 3a and 3b, and the other end connected to the terminal boxes 8a and 8b.

[0043] <First sealing member 6> As shown in Figure 1, the first sealing member 6 is a member that seals the solar cell string 2, the wiring member 3, and a portion of the wiring take-out wiring 5a, 5b together with the second sealing member 7, and comprises a first sealing material 60 and a first sealing substrate 61.

[0044] (First sealing material 60) The first sealing material 60 is a light-transmitting insulating sealing material that has sealing, insulating, and light-transmitting properties, and as shown in Figure 5, it is an adhesive that bonds the first sealing substrate 61, the solar cell string 2, the wiring member 3, the wiring take-out wires 5a and 5b, and the second sealing material 65 of the second sealing member 7. The first encapsulant 60 is not particularly limited as long as it has sealing, insulating, and light-transmitting properties; for example, a resin encapsulant such as a polyolefin elastomer can be used.

[0045] (First sealing board 61) The first sealing substrate 61 is a light-transmitting insulating substrate that has sealing, insulating, and light-transmitting properties. The first sealing substrate 61 is not particularly limited as long as it has sealing, insulating, and light-transmitting properties; for example, a glass substrate such as float glass or colored glass can be used.

[0046] <Second sealing member 7> As shown in Figure 1, the second sealing member 7 comprises a second sealing material 65 and a second sealing substrate 66.

[0047] (Second sealing material 65) The second sealing material 65 is a light-transmitting insulating sealing material that has sealing, insulating, and light-transmitting properties, and as shown in Figure 5, it is an adhesive that bonds the second sealing substrate 66, the solar cell string 2, the wiring member 3, the wiring take-out wires 5a and 5b, and the first sealing material 60 of the first sealing member 6. The second encapsulant 65 is not particularly limited as long as it has sealing, insulating, and light-transmitting properties; for example, a resin encapsulant such as polyolefin elastomer can be used.

[0048] (Second sealing board 66) The second sealing substrate 66 is a light-transmitting insulating substrate that has sealing, insulating, and light-transmitting properties. The second sealing substrate 66 is not particularly limited as long as it has sealing, insulating, and light-transmitting properties; for example, a glass substrate such as float glass or colored glass can be used.

[0049] <Terminal boxes 8a, 8b> As shown in Figure 1, terminal boxes 8a and 8b are located outside the first sealing member 6 and the second sealing member 7 when viewed from above, and are provided on the end face of the solar cell module 1. Cables are extended from them, and the power generated by the solar cell string 2 is taken out to the outside via the cables.

[0050] Next, the positional relationships of each part of the solar cell module 1 of the first embodiment of the present invention will be described.

[0051] As shown in Figures 2 and 3, each solar cell string 2 in the solar cell module 1 is connected to wiring members 3a and 3b. As shown in Figures 1 and 5, the solar cell module 1 is sealed with multiple solar cell strings 2, wiring members 3, and wiring output wires 5a and 5b sandwiched between a first sealing member 6 and a second sealing member 7. Each solar cell string 2 is connected in series by a conductive adhesive 21 so that one or more solar cell panels 20 are arranged in a straight line in the lateral direction X, as shown in Figures 2 and 5. All solar cell modules 1 and solar cell strings 2 are aligned in the same direction. In other words, in each solar cell string 2, the overlapping direction of each solar cell panel 20 coincides, and when viewed from the first sealing member 6 side, the positions of the edges 23 of the solar cell panels 20 are aligned in a straight line in the vertical direction Y.

[0052] As shown in Figure 4, wiring component 3b is in the same orientation as wiring component 3a, but with the front and back reversed. As shown in Figure 5, each solar cell string 2 has the second sealing member 7 side covered with the wiring member 3a and the first sealing member 6 side covered with the wiring member 3b. As shown in Figure 2, the wiring pattern 51a of wiring member 3a is opposite to the wiring pattern 51a of wiring member 3b in the lateral direction X, the wiring pattern 51b of wiring member 3b is opposite to the wiring pattern 51b of wiring member 3b in the lateral direction X, and the wiring pattern 51c of wiring member 3b is opposite to the wiring pattern 51c of wiring member 3b in the lateral direction X. In the wiring patterns 51a to 51c of wiring member 3a, each connecting wiring section 53 extends laterally in the X direction from the main wiring section 52 toward the inside (towards wiring member 3b), and in the wiring patterns 51a to 51c of wiring member 3b, each connecting wiring section 53 extends laterally in the X direction from the main wiring section 52 toward the inside (towards wiring member 3a). The wiring patterns 51a to 51c of the wiring member 3a have a main wiring section 52 that extends in the same direction and is parallel to the main wiring section 52 of the wiring patterns 51c, 51b, and 51a of the wiring member 3b, and each connecting wiring section 53 is aligned in a straight line with each connecting wiring section 53 of the wiring member 3b.

[0053] The solar cell string 2 has its upstream end in the direction of electrical flow connected to multiple connection wiring sections 53 of wiring member 3a, and its downstream end connected to multiple connection wiring sections 53 of wiring member 3b. In other words, as shown in Figures 5 and 7, the solar cell string 2 has a second busbar electrode portion 40 of the solar cell panel 20A located at the end in the direction of electrical flow that spans multiple connection wiring portions 53 arranged in the vertical direction Y of the wiring member 3a, and a first busbar electrode portion 30 of the solar cell panel 20B located at the end in the direction of electrical flow that spans multiple connection wiring portions 53 arranged in the vertical direction Y of the wiring member 3b. Each solar cell string 2 is electrically connected in parallel by the wiring pattern 51 of the wiring members 3a and 3b, and the ends in the direction of electric current flow are at the same potential.

[0054] From another perspective, as shown in Figure 7, the solar cell string 2 has busbar electrode portions 40, 30 of the solar cell panels 20A, 20B at the ends in the direction of electrical flow, which are arranged to straddle the connection overlap portions 71, 71 adjacent to the wiring members 3a, 3b in the vertical direction Y, and are arranged to block the non-overlapping portion 58 between the connection overlap portions 71, 71. As shown in Figure 5, the solar cell string 2 has its busbar electrode portions 40, 30 of the solar cell panels 20A, 20B at the ends in the direction of electric flow bonded to the connecting superposition portions 71, 71 by conductive adhesives 21A, 21B. It is preferable that the conductive adhesives 21A and 21B remain on the connecting overlapping portions 71, 71 and are not adhered to the non-overlapping portion 58.

[0055] In the solar cell module 1 of this embodiment, as shown in Figure 7, the wiring member 3 has a wiring pattern 51a to 51c on an insulating substrate 50, a main wiring section 52 extending in the vertical direction Y (first direction), a first connecting wiring section 53A extending from the main wiring section 52 in the horizontal direction X (intersecting direction with respect to the first direction), and a second connecting wiring section 53B extending from the main wiring section 52 in the horizontal direction X at a distance from the first connecting wiring section 53A. Furthermore, as shown in Figure 5, the solar cell panel 20 is connected to the first connecting wiring section 53A by a first conductive adhesive 21A and to the second connecting wiring section 53B by a second conductive adhesive 21B. Furthermore, as shown in Figure 7, when viewed from above, the wiring member 3 has at least a stress-relaxing portion that can be deformed with a vertical Y component (first direction component) in the portion between the first connection overlap portion 71A (first overlap portion) where the first connection wiring portion 53A and the insulating substrate 50 overlap, the second connection overlap portion 71B (second overlap portion) where the second connection wiring portion 53B and the insulating substrate 50 overlap, and the non-overlapping portion 58A between the first connection overlap portion 71A and the second connection overlap portion 71B. Therefore, even if thermal stress is generated between the solar cell panel 20 and the wiring member 3, the thermal stress can be distributed because the wiring members 3a and 3b are connected by multiple connection wiring portions 53, and the thermal stress can be relieved by the deformation of the first connection overlap portion 71A, the second connection overlap portion 71B, and the non-overlapping portion 58A, thereby preventing peeling, damage, deformation, etc. of the wiring member 3 due to thermal stress.

[0056] In the solar cell module 1 of this embodiment, the stress relaxation portion is preferably located in the non-overlapping portion 58A between the first connection overlap portion 71A and the second connection overlap portion 71B when viewed from above, as shown in Figure 7(b), and is more easily deformable than the first connection overlap portion 71A and the second connection overlap portion 71B. This makes it possible to reduce the stress on the first connection wiring portion 53A and the second connection wiring portion 53B.

[0057] In the solar cell module 1 of this embodiment, it is preferable that the first connection wiring section 53A and the second connection wiring section 53B extend parallel to each other. This makes it less likely for the first connection wiring section 53A and the second connection wiring section 53B to interfere with each other.

[0058] In the solar cell module 1 of this embodiment, it is preferable that the width W1 of the main wiring section 52 shown in Figure 4 is larger than the width W2 of the connecting wiring section 53. This allows for stable extraction of electricity from the solar cell string 2.

[0059] In the solar cell module 1 of this embodiment, it is preferable that the insulating substrate 50 is flexible. This allows the insulating substrate 50 to elastically deform in a direction that relieves stress, thereby relieving the stress.

[0060] In the embodiment described above, the wiring member 3 constituted a stress-relieving section by making the pattern-overlay section 56, the conductive-overlay section 57, and the non-overlay section 58 each deformable, but it is not limited to this. The stress-relieving section may also function by making the positions of the pattern-overlay section 56, the conductive-overlay section 57, and the non-overlay section 58 movable. In other words, stress may be relieved by moving a part of the wiring member 3 in a direction in which stress is relieved.

[0061] In the embodiment described above, the wiring member 3 had a patterned superimposed portion 56, a conductive superimposed portion 57, and a non-superimposed portion 58, each of which constituted a stress-relieving portion. However, the present invention is not limited to this. The non-superimposed portion 58 between adjacent connecting superimposed portions 71, 71 may be made deformable to function as a stress-relieving portion.

[0062] In the embodiment described above, the wiring member 3 relieves stress between the solar cell panel 20 and the connecting wiring portions 53, 53 by elastically deforming the first connecting superimposed portion 71A, the second connecting superimposed portion 71B, and the non-superimposed portion 58A, respectively, so as to relieve stress. However, the present invention is not limited thereto. As can be seen from Figure 8, the wiring member 3 may have a slit portion 90 extending in the lateral direction X between the insulating substrate 50 and the connecting superimposed portions 71, 71 (first superimposed portion, second superimposed portion) adjacent in the vertical direction Y when viewed from above, and the insulating substrate 50 may partially move due to the slit portion 90 to relieve stress. In this way, stress can be relieved even if the insulating substrate 50, the wiring pattern 51, and the conductive wiring 55 are not flexible. The slit portion 90 may extend in a straight line or in a meandering manner, as long as it extends in the lateral direction X as a whole from the side of the insulating substrate 50 opposite to the main wiring portion 52.

[0063] In the embodiment described above, the connecting wiring section 53 had the same uniform width in the longitudinal direction, but the present invention is not limited thereto. The connecting wiring section 53 may have different widths in some parts in the longitudinal direction. For example, as shown in Figure 9, the connecting wiring section 53 may have a planar connecting section 95 and an intermediate wiring section 96, the intermediate wiring section 96 connecting the planar connecting section 95 and the main wiring section 52, and being narrower than the minimum width of the planar connecting section 95 for most of the lateral direction X, and the solar cell panel 20 may be connected to the planar connecting section 95 of the connecting wiring section 53 by a conductive adhesive 21. In this way, the solar cell panel 20 and the planar connecting section 95 can be stably bonded by the conductive adhesive 21, and the adhesive strength can be further improved. The shape of the planar connection portion 95 is not particularly limited, as long as it is greater than or equal to the width of the intermediate wiring portion 96 and functions as a land. The shape of the planar connection portion 95 may be, for example, trapezoidal as shown in Figure 9(a), or rectangular or rounded rectangular as shown in Figure 9(b), or circular. Furthermore, it is preferable that the entire planar connection portion 95 overlaps with the solar cell panel 20, as shown in Figure 9. This allows the planar connection portion 95 to be hidden by the solar cell panel 20 when viewed from the first main surface 4a side, making the planar connection portion 95 less visible.

[0064] In the embodiment described above, the wiring patterns 51a to 51c are independent of each other and are connected by conductive wiring 55 to provide electrical conductivity between them. However, the present invention is not limited to this. The wiring patterns 51a to 51c may be integrated. For example, the main wiring section 52 of each wiring pattern 51a to 51c may be common.

[0065] In the embodiments described above, the components can be freely substituted or added between each embodiment, as long as they fall within the technical scope of the present invention. [Explanation of Symbols]

[0066] 1. Solar cell module 3,3a,3b Wiring components 20, 20A, 20B solar panels 21 Conductive adhesive 21A 1st conductive adhesive 21B 2nd conductive adhesive 50 Insulating substrate 51, 51a~51c Wiring Pattern 52 Main Wiring Section 53 Connection Wiring Section 53A First connection wiring section 53B Second connection wiring section 56 Pattern Overlay Section (Stress Relaxation Section) 57 Conductive superposition section (stress relaxation section) 58, 58A Non-superimposed section (stress relaxation section) 70 Core Overlay Section 71 Connection Superposition 71A First connection superposition section 71B Second connection superposition section 90 Slit section 95 Planar connection part 96 Intermediate wiring section

Claims

1. It has a solar panel and wiring components, The aforementioned wiring member has a wiring pattern formed on an insulating substrate. The wiring pattern includes a main wiring section extending in a first direction, a first connecting wiring section extending from the main wiring section in a direction intersecting the first direction, and a second connecting wiring section extending from the main wiring section in the intersecting direction at a distance from the first connecting wiring section. The solar cell panel is connected to the first connecting wiring section by a first conductive adhesive and to the second connecting wiring section by a second conductive adhesive. A solar cell module wherein, when viewed from above, the wiring member has a stress-relaxing portion that is movable or deformable in at least one of the following areas: a first overlapping portion where the first connecting wiring portion and the insulating substrate overlap, a second overlapping portion where the second connecting wiring portion and the insulating substrate overlap, and a portion between the first and second overlapping portions.

2. The solar cell module according to claim 1, wherein the stress-relaxing portion is located between the first superimposed portion and the second superimposed portion when viewed from above, and is more easily deformed than the first superimposed portion and the second superimposed portion.

3. The solar cell module according to claim 1 or 2, wherein the first connection wiring section and the second connection wiring section extend parallel to each other.

4. The solar cell module according to claim 1 or 2, wherein the width of the main wiring section is greater than the width of the first connecting wiring section.

5. The solar cell module according to claim 1 or 2, wherein the wiring member, when viewed from above, has a slit portion extending in the intersecting direction between the first superimposed portion and the second superimposed portion.

6. The solar cell module according to claim 1 or 2, wherein the insulating substrate is flexible.

7. The first connecting wiring section has a planar connecting section and an intermediate wiring section. The intermediate wiring section connects the planar connection section and the main wiring section, and in most of the intersecting direction, its width is less than or equal to the minimum width of the planar connection section. The solar cell module according to claim 1 or 2, wherein the solar cell panel is connected to the planar connection portion of the first connection wiring portion by the first conductive adhesive.

8. A wiring component that can be connected to a solar panel, Having a wiring pattern on an insulating substrate, The wiring pattern, when connected to the solar cell panel, has a main wiring section extending in a first direction, a first connecting wiring section extending from the main wiring section in a direction intersecting the first direction, and a second connecting wiring section extending from the main wiring section in the intersecting direction at a distance from the first connecting wiring section. The first connecting wiring section is connected to the solar cell panel by a first conductive adhesive when connected to the solar cell panel, and the second connecting wiring section is connected to the solar cell panel by a second conductive adhesive. A wiring member having, when viewed from above, a stress-relieving portion that can move or deform in at least one of the following: a first overlapping portion where the first connecting wiring portion and the insulating substrate overlap, a second overlapping portion where the second connecting wiring portion and the insulating substrate overlap, and a portion between the first overlapping portion and the second overlapping portion.

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