Solar cell modules and wiring components

Abstract

The present invention provides a solar cell module and wiring member that allows for easier adjustment of the spacing between solar cell strings compared to conventional methods. [Solution] The wiring member has a wiring member that electrically connects the first solar cell string, the second solar cell string, and the third solar cell string in parallel. The wiring member has a wiring pattern formed on an insulating substrate. The wiring pattern has a main wiring section extending in a second direction, a first connecting wiring section extending from the main wiring section in a first direction and connected to the first solar cell string, a second connecting wiring section extending from the main wiring section in a first direction and connected to the second solar cell string, and a third connecting wiring section extending from the main wiring section in a first direction and connected to the third solar cell string. The distance between the first connecting wiring section and the second connecting wiring section is substantially equal to the distance between the second connecting wiring section and the third connecting wiring section.

Description

Technical Field

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

Background Art

[0002] In recent years, a bifacial through-type solar cell module that regularly arranges solar cells and collects light from the gaps between adjacent solar cells has been known (for example, Patent Document 1). For example, the solar cell module of Patent Document 1 forms a plurality of solar cell strings in which rectangular solar cells having a smaller area than the solar cells used in a normal solar cell module are arranged linearly in the horizontal direction, and the solar cell strings are arranged at equal intervals in the vertical direction. According to Patent Document 1, by adopting such a structure, when used as a wall building material such as a window, light such as sunlight can be made to circulate from the light collection part between the solar cell strings to the power generation part of the solar cell strings, making it difficult for the power generation part of the solar cell strings to become dark and making the power generation part less conspicuous.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] By the way, since the solar cell module of Patent Document 1 uses small-piece solar cells, in the manufacturing process, the solar cell strings may tilt or the intervals between the solar cell strings may shift. If the intervals between the solar cell strings are not substantially equal, portions with a large amount of light collection and portions with a small amount of light collection will occur, and the tilt and interval shift may become conspicuous. In such a case, the design property may be impaired. Therefore, the solar cell module described in Patent Document 1 has the problem that, compared to ordinary solar cell modules, it requires higher precision when arranging solar cell strings, making it difficult to obtain a sufficient yield, and there is room for further improvement.

[0005] Therefore, the object of the present invention is to provide a solar cell module and wiring member that can easily adjust the spacing between solar cell strings compared to conventional methods. [Means for solving the problem]

[0006] One aspect of the present invention for solving the above-mentioned problems is a solar cell module having a plurality of solar cell strings, each including a series cell group in which a plurality of solar cells are connected in series so as to be aligned in a first direction, wherein the solar cell strings are sealed by being sandwiched between a first sealing member and a second sealing member, wherein the solar cell strings include a first solar cell string, a second solar cell string, and a third solar cell string arranged in parallel with a gap in the second direction, and the first solar cell string, the second solar cell string, and the third solar cell string are electrically connected in parallel, and the wiring part The material is a solar cell module in which a wiring pattern is formed on an insulating substrate, the wiring pattern having a main wiring section extending in the second direction, a first connecting wiring section extending from the main wiring section in the first direction and connected to the first solar cell string, a second connecting wiring section extending from the main wiring section in the first direction and connected to the second solar cell string, and a third connecting wiring section extending from the main wiring section in the first direction and connected to the third solar cell string, wherein the distance between the first and second connecting wiring sections is substantially equal to the distance between the second and third connecting wiring sections.

[0007] In this context, "substantially equal" means that the absolute value of the difference between one value and the other value is 5% or less of the value of the other. That is, "the distance between the first and second connection wiring sections is substantially equal to the distance between the second and third connection wiring sections" means that the absolute value of the difference between the distance between the first and second connection wiring sections and the distance between the second and third connection wiring sections is 5% or less of the distance between the first and second connection wiring sections. The same applies hereafter.

[0008] According to this design, the first, second, and third solar cell strings are connected in accordance with the positions of the first, second, and third connection wiring sections, respectively, allowing them to be arranged at substantially equal intervals. As a result, the yield during manufacturing is improved compared to conventional methods, and the design is also better.

[0009] A preferred configuration is one in which the first connecting wiring section, the second connecting wiring section, and the third 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 feature is that the insulating substrate is colored and of a different color from the wiring pattern.

[0012] A preferred configuration is one in which the solar cell has an auxiliary electrode portion extending in the second direction, and the solar cell string includes a fourth solar cell string arranged in parallel with respect to the first solar cell string at a distance in the second direction, the direction of current flow in the solar cells of the fourth solar cell string is opposite to the direction of current flow in the solar cells of the first solar cell string, and the first solar cell string is connected to the first connecting wiring portion such that the auxiliary electrode portions of the solar cells are aligned in a straight line with the auxiliary electrode portions of the solar cells of the fourth solar cell string in the second direction.

[0013] A preferred configuration is one in which the solar cell string has a light-receiving surface, and the solar cell string is made up of multiple solar cells connected in series with overlapping portions, and within the solar cell string there is a fourth solar cell string arranged in parallel with the first solar cell string at a distance in the second direction, the direction of current flow in the solar cells of the fourth solar cell string is opposite to the direction of current flow in the solar cells of the first solar cell string, and the first solar cell string is connected to the first connecting wiring section such that, when viewed from the light-receiving surface side in a plan view, the edge of each solar cell is aligned in a straight line with the edge of each solar cell of the fourth solar cell string in the second direction.

[0014] A preferred configuration is that the solar cell string includes a fifth solar cell string arranged in parallel with respect to the fourth solar cell string at a distance in the second direction, and has a second wiring member that electrically connects the fourth solar cell string and the fifth solar cell string, the second wiring member having a second wiring pattern formed on a second insulating substrate, the second wiring pattern having a second main wiring section extending in the second direction, a fourth connecting wiring section extending from the second main wiring section in the first direction and connected to the fourth solar cell string, and a fifth connecting wiring section extending from the second main wiring section in the first direction and connected to the fifth solar cell string, the first solar cell string being connected with an overlap with the first connecting wiring section, the fourth solar cell string being connected with an overlap with the fourth connecting wiring section, and the overlap width between the first solar cell string and the first connecting wiring section being different from the overlap width between the fourth solar cell string and the fourth connecting wiring section.

[0015] A preferred configuration is that the first solar cell string comprises a series cell group in which solar cells are connected in series, and cell extraction wiring connecting the series cell group to the first connection wiring section.

[0016] A preferred configuration has a second wiring member on which a second wiring pattern is formed on a second insulating substrate. In the direction of electrical flow, one end of the series cell group is connected to the cell extraction wiring, and the other end is connected directly or via a conductive adhesive to the second wiring pattern of the second wiring member.

[0017] A preferred feature is that the width of the cell extraction wiring differs from the width of the first connection wiring section.

[0018] A preferred configuration is that the first connecting wiring section is continuous with the main wiring section and has a width-changing section whose width increases as it moves from the first solar cell string side toward the main wiring section.

[0019] A preferred configuration is that the solar cell string includes a fourth solar cell string arranged in parallel with respect to the first solar cell string at a distance in the second direction, the direction of current flow in the solar cells of the fourth solar cell string is opposite to the direction of current flow in the solar cells of the first solar cell string, and the wiring pattern further includes a fourth connecting wiring section that extends from the main wiring section in the first direction and is connected to the fourth solar cell string.

[0020] A preferred configuration is that the solar cell string includes a fifth solar cell string arranged in parallel with respect to the fourth solar cell string at a distance in the second direction, the direction of current flow in the solar cells of the fifth solar cell string is the same as the direction of current flow in the solar cells of the fourth solar cell string, and the wiring pattern further includes a fifth connecting wiring section that extends from the main wiring section in the first direction and is connected to the fifth solar cell string.

[0021] A preferred configuration is that the first solar cell string has a series cell group in which solar cells are connected in series, and a second wiring member having a second wiring pattern formed on a second insulating substrate, wherein, in the direction of electrical flow, one end of the series cell group is connected directly or via a conductive adhesive to the first connecting wiring portion of the wiring member, and the other end is connected directly or via a second conductive adhesive to the second wiring pattern of the second wiring member, the wiring member is positioned closer to the first sealing member than the series cell group, and the second wiring member is positioned closer to the second sealing member than the series cell group.

[0022] One aspect of the present invention is a wiring member usable in a solar cell module having a plurality of solar cell strings, each including a series cell group in which a plurality of solar cell cells are connected in series so as to be aligned in a first direction, wherein the solar cell strings are sealed by being sandwiched between a first sealing member and a second sealing member, and the solar cell strings include a first solar cell string, a second solar cell string, and a third solar cell string arranged in parallel with a gap in a second direction, and the wiring member has a wiring pattern on an insulating substrate, and when used in the solar cell module, the first solar cell string, the second solar cell string, and the third solar cell string The wiring is used to electrically connect the strings in parallel, and the wiring pattern, when used in the solar cell module, has a main wiring section extending in the second direction, a first connecting wiring section extending from the main wiring section in the first direction and connected to the first solar cell string, a second connecting wiring section extending from the main wiring section in the first direction and connected to the second solar cell string, and a third connecting wiring section extending from the main wiring section in the first direction and connected to the third solar cell string, wherein the distance between the first and second connecting wiring sections is substantially equal to the distance between the second and third connecting wiring sections.

[0023] According to this aspect, when used in a solar cell module, the first solar cell string, the second solar cell string, and the third solar cell string can be respectively connected according to the first connection wiring portion, the second connection wiring portion, and the third connection wiring portion. Therefore, the first solar cell string, the second solar cell string, and the third solar cell string can be arranged substantially at equal intervals. As a result, the yield is improved compared to the conventional method during manufacturing, and the design property is also improved.

[0024] As long as the above-described aspects are included in the technical scope of the present invention, aspects can be mutually dependent, a part of the configuration can be cited, or a part of the configuration can be replaced between the aspects.

Effects of the Invention

[0025] According to the solar cell module and the wiring member of the present invention, the interval between solar cell strings can be easily adjusted compared to the conventional method.

Brief Description of the Drawings

[0026] [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 in which a part of the solar cell module of FIG. 3 is further decomposed. [Figure 5] It is a cross-sectional view of the solar cell module of FIG. 2, (a) is a cross-sectional view taken along line A-A of the solar cell module, and (b) is a cross-sectional view taken along line B-B of the solar cell module. [Figure 6] It is an explanatory view of the solar cell of FIG. 3, (a) is a perspective view of the solar cell, and (b) is a perspective view in which the solar cell of (a) is inverted vertically. [Figure 7] It is a plan view showing the relationship between the solar cell strings of FIG. 2. [Figure 8]Figure 2 is a plan view showing the relationship between the solar cell string and the wiring components. [Figure 9] This is an explanatory diagram of a solar cell module according to another embodiment of the present invention, where (a) is a cross-sectional view of an embodiment in which the solar cell string has a single cell extraction wiring, and (b) is a cross-sectional view of an embodiment in which the solar cell string does not have a cell extraction wiring. [Figure 10] This is an explanatory diagram of a solar cell module according to another embodiment of the present invention, where (a) is a plan view of an embodiment in which the width of the connection wiring section is wider than the width of the solar cell string, (b) is a plan view of an embodiment in which the width of the cell extraction wiring is wider than the width of the solar cell and the connection wiring section, and (c) is a plan view of an embodiment in which the connection wiring section is provided with a width-changing section. [Figure 11] This is an explanatory diagram of a solar cell module according to another embodiment of the present invention, and is a plan view of an embodiment in which multiple wiring members are connected in the vertical direction. [Figure 12] This diagram illustrates another embodiment of the solar cell module of the present invention, in which a plurality of wiring members are connected in the vertical direction, where (a) is a perspective view of an embodiment in which engagement occurs by a hook portion, (b) is a perspective view of an embodiment in which engagement occurs by a convex portion and a concave portion, and (c) is a perspective view of an embodiment in which engagement occurs by a convex portion and a hole portion. [Modes for carrying out the invention]

[0027] Embodiments of the present invention will be described in detail below.

[0028] The solar cell module 1 of 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 Figure 1, and is a see-through type solar cell module that can transmit light in the thickness direction. Furthermore, the solar cell module 1 is suitable for use in building materials such as windows, and is a double-sided light-receiving solar cell module in which both the first main surface 4a and the second main surface 4b can serve as light-receiving surfaces. The following description will explain the case where the solar cell module 1 is used in a room window, with the first main surface 4a facing the outside and the second main surface 4b facing the inside. In the following description, the first main surface 4a of the solar cell module 1 is the light-receiving surface that receives sunlight.

[0029] 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.

[0030] <Solar String 2> As shown in Figures 3 and 4, the solar cell string 2 comprises a group of solar cells 10 (a group of cells in series) and cell extraction wiring 11 and 12.

[0031] (Solar cell group 10) As shown in Figure 5, the solar cell group 10 is a series cell group in which one or more solar cells 20 are electrically connected in series either directly or via a conductive adhesive 21, and the direction of electric current flow during power generation is unidirectional.

[0032] As can be seen from Figure 6, the solar cell 20 is a small rectangular panel with sides 22-25 when viewed from above, with a first collector electrode 26 provided on one main surface 28 and a second collector electrode 27 provided on the other main surface 29.

[0033] As shown in Figure 6(a), the first collecting electrode 26 comprises a first busbar electrode section 30, a plurality of first finger electrode sections 31, and a plurality of first auxiliary electrode sections 32. The first busbar electrode portion 30 is an electrode portion that has width in the direction of extension of the long sides 24 and 25 in the vicinity of the short side 22, and extends along the short side 22.

[0034] The first finger electrode portion 31 is an electrode portion that extends from the first busbar electrode portion 30 toward the short side 23, and has width in the direction of extension of the short sides 22 and 23, and length along the long 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 short sides 22 and 23.

[0035] The first auxiliary electrode section 32 is an electrode section that connects the intermediate portions of each first finger electrode section 31 and brings each first finger electrode section 31 to the same potential. It has width in the direction of extension of the long sides 24 and 25 and has length along the short sides 22 and 23. The first auxiliary electrode section 32 is located on the shorter side 23 side of the first busbar electrode section 30 and is provided parallel to the first busbar electrode section 30. The width of the first auxiliary electrode portion 32 is preferably smaller than the width of the first busbar electrode portion 30. Each first auxiliary electrode portion 32 is arranged at substantially equal intervals in the direction of extension of the long sides 24 and 25.

[0036] 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, a plurality of second finger electrode sections 41, and a plurality of second auxiliary electrode sections 42. The second busbar electrode portion 40 is an electrode portion that has width in the direction of extension of the long sides 24 and 25 in the vicinity of the short side 23, and extends in length along the short side 23.

[0037] The second finger electrode portion 41 is an electrode portion that extends from the second busbar electrode portion 40 toward the short side 22, and has width in the direction of extension of the short sides 22 and 23, and length along the long 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 short sides 22 and 23.

[0038] The second auxiliary electrode section 42 is an electrode section that connects the intermediate portions of each second finger electrode section 41 and brings each second finger electrode section 41 to the same potential. It has width in the direction of extension of the long sides 24 and 25 and has length along the short sides 22 and 23. The second auxiliary electrode section 42 is located on the shorter side 22 side than the second busbar electrode section 40 and is provided parallel to the second busbar electrode section 40. The width of the second auxiliary electrode portion 42 is preferably smaller than the width of the second busbar electrode portion 40. Each second auxiliary electrode portion 42 is arranged at substantially equal intervals in the direction of extension of the long sides 24 and 25.

[0039] In this embodiment, the solar cell group 10 is connected between adjacent solar cells 20, 20 by overlapping portions of 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).

[0040] The conductive adhesive 21 is a conductive member that has electrical conductivity and, as shown in Figure 5, is an adhesive that connects the busbar electrode portions 30 and 40 of adjacent solar cells 20, 20. The conductive adhesive 21 can be, for example, a conductive paste.

[0041] (Cell extraction wiring 11, 12) The cell extraction wirings 11 and 12 are connection wirings that connect the busbar electrode sections 30 and 40 located at the respective ends in the series direction of the solar cell group 10 to the wiring members 3a and 3b, as shown in Figure 5. The cell output wiring 11 and 12 are conductive wiring made of a conductive material such as metal.

[0042] <Wiring component 3> The wiring member 3 is a component that extracts power from each solar cell string 2 to the outside, and as shown in Figure 4, has one or more wiring patterns 51 (51a to 51c) formed on an insulating substrate 50, and is equipped with a marking portion 54.

[0043] (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 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 suppressing positional displacement during manufacturing, it is preferable that the insulating substrate 50 has a shrinkage rate of 2% or less in accordance with JIS K 6941:2019. The thickness of the insulating substrate 50 is preferably 50 μm or more, and more preferably 300 μm or more, from the viewpoint of suppressing positional displacement during manufacturing.

[0044] (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.

[0045] 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 8 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. The width W2 of the connection wiring section 53 shown in Figure 8 is preferably equal to the width W7 of the cell extraction wiring 11 and 12 shown in Figure 4, and preferably equal to the width W8 of the solar cell 20.

[0046] 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 between adjacent connection wiring sections 53, 53 in the vertical direction Y is substantially equal.

[0047] The spacing D1 between the connecting wiring sections 53, 53 of the wiring pattern 51 shown in Figure 8 is preferably equal to the distance D2 between each wiring pattern 51, 51.

[0048] (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.

[0049] <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.

[0050] <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.

[0051] (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 output wiring 5, 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.

[0052] (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.

[0053] <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.

[0054] (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 output wiring 5, 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.

[0055] (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.

[0056] <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.

[0057] Next, the positional relationships of each part of the solar cell module 1 of the first embodiment of the present invention will be described.

[0058] 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 wiring 5 sandwiched between a first sealing member 6 and a second sealing member 7. As shown in Figures 2 and 5, each solar cell string 2 is formed by connecting one or more solar cells 20 in series so that they are arranged in a straight line in the lateral direction X, thereby creating a solar cell group 10.

[0059] As shown in Figure 4, the wiring member 3b is in a position where, when viewed from above, it is the same as the wiring member 3a rotated 180 degrees. In the wiring member 3a, the wiring pattern 51a faces the wiring pattern 51c of the wiring member 3b in the lateral direction X, the wiring pattern 51b faces the wiring pattern 51b of the wiring member 3b in the lateral direction X, and the wiring pattern 51c faces the wiring pattern 51a of the 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.

[0060] The solar cell string 2 includes a forward-facing string 2F shown in Figure 5(a) and a reverse-facing string 2R shown in Figure 5(b). The forward string 2F has its upstream end in the direction of electrical flow of the solar cell group 10 connected to the connection wiring section 53 of the wiring member 3a via the cell extraction wiring 11, and its downstream end connected to the connection wiring section 53 of the wiring member 3b via the cell extraction wiring 12. The reverse string 2R is a solar cell string 2 in which the direction of electrical flow of the solar cell group 10 is opposite to that of the forward string 2F. The upstream end of the solar cell group 10 in the direction of electrical flow is connected to the connection wiring section 53 of the wiring member 3b via the cell extraction wiring 11, and the downstream end is connected to the connection wiring section 53 of the wiring member 3a via the cell extraction wiring 12.

[0061] As shown in Figure 7, when viewed from the first main surface 4a side, the ends of the solar cells 20Fb located on the first sealing member 6 side of the adjacent solar cells 20Fa and 20Fb are aligned on the same imaginary line L1 (same straight line) in the lateral direction X, and the positions of the auxiliary electrode portions 32 of the solar cells 20Fa and 20Fb are aligned on the same imaginary line L2 (same straight line). Similarly, in each reverse-direction string 2R, as shown in Figure 7, when viewed from the first main surface 4a side, the end positions of the solar cell 20Ra located on the first sealing member 6 side of the adjacent solar cells 20Ra and 20Rb are aligned on the same virtual line L1 in the lateral direction X, and the positions of the auxiliary electrode portions 42 of the solar cells 20Ra and 20Rb are aligned on the same virtual line L2. In other words, in the forward string 2F, the position of the end of the solar cell 20Fb on the first sealing member 6 side lies on the same virtual line L1 as the position of the end of the solar cell 20Ra on the first sealing member 6 side of the reverse string 2R. Furthermore, in the forward string 2F, the positions of the auxiliary electrode portions 32 of solar cells 20Fa and 20Fb lie on the same virtual line L2 as the positions of the auxiliary electrode portions 42 of solar cells 20Ra and 20Rb in the reverse string 2R.

[0062] As shown in Figure 8, when viewed from the first main surface 4a side, the inner ends of the cell extraction wiring 11 connected to the most upstream solar cell 20Fc in each forward string 2F are aligned on the same virtual line L3 (same straight line), and the outer ends of the most downstream solar cell 20Fd are aligned on the same virtual line L4 (same straight line). As shown in Figure 8, when viewed from the first main surface 4a side, the inner ends of the cell extraction wiring 11 connected to the most upstream solar cell 20Rd in each reverse-direction string 2R are aligned on the same virtual line L4, and the outer ends of the most downstream solar cell 20Rc are aligned on the same virtual line L3. In other words, when viewed from the first main surface 4a side, the position of the inner end of the cell extraction wiring 11 connected to the solar cell 20Fc of each forward string 2F lies on the same virtual line L3 as the position of the outer end of the solar cell 20Rc located furthest downstream of each reverse string 2R, and the position of the outer end of the solar cell 20Fd located furthest downstream lies on the same virtual line L4 as the position of the inner end of the cell extraction wiring 11 connected to the solar cell 20Rd located furthest upstream of each reverse string 2R.

[0063] As shown in Figure 8, when viewed from the first main surface 4a side, the outer end of the cell extraction wiring 11 of each forward string 2F is aligned with the lateral X direction, and the outer end of the cell extraction wiring 12 is aligned with the lateral X direction. Each forward string 2F has an overlap width W3 between the wiring member 3a of the cell extraction wiring 11 and the connecting wiring portion 53, which is different from the overlap width W4 between the wiring member 3b of the cell extraction wiring 12 and is larger than the overlap width W4 of the cell extraction wiring 12.

[0064] Similarly, when viewed from above from the first main surface 4a side, each reverse-direction string 2R has the position of the outer end of the cell extraction wiring 11 aligned with the lateral X direction, and the position of the outer end of the cell extraction wiring 12 aligned with the lateral X direction. Each reverse-direction string 2R has an overlap width W5 between the wiring member 3a of the cell extraction wiring 12 and the connecting wiring portion 53, which is different from the overlap width W6 between the wiring member 3b of the cell extraction wiring 11 and is smaller than the overlap width W6 of the cell extraction wiring 11.

[0065] When viewed from above from the first main surface 4a side, the position of the outer end of the cell extraction wiring 11 of each forward string 2F is shifted laterally in the X direction from the position of the outer end of the cell extraction wiring 12 of each reverse string 2R, and the position of the outer end of the cell extraction wiring 12 is shifted laterally in the X direction from the position of the outer end of the cell extraction wiring 11 of each reverse string 2R.

[0066] According to the solar cell module 1 of this embodiment, as shown in Figure 8, the solar cell string 2 contains a first solar cell string 2A, a second solar cell string 2B, and a third solar cell string 2C arranged in parallel with a gap in the vertical direction Y (second direction), and has wiring members 3a and 3b that electrically connect the first solar cell string 2A, the second solar cell string 2B, and the third solar cell string 2C in parallel. Furthermore, the wiring member 3 of the solar cell module 1 has a wiring pattern 51 formed on an insulating substrate 50. The wiring pattern 51 includes a main wiring section 52 extending in the vertical direction Y, a first connecting wiring section 53A extending from the main wiring section 52 in the horizontal direction X (first direction) and connected to the first solar cell string 2A, a second connecting wiring section 53B extending from the main wiring section 52 in the horizontal direction X and connected to the second solar cell string 2B, and a third connecting wiring section 53C extending from the main wiring section 52 in the horizontal direction X and connected to the third solar cell string 2C. Furthermore, the distance D1 between the first connection wiring section 53A and the second connection wiring section 53B is substantially equal to the distance D1 between the second connection wiring section 53B and the third connection wiring section 53C. As described above, with the solar cell module 1 of this embodiment, the first solar cell string 2A, the second solar cell string 2B, and the third solar cell string 2C are connected in accordance with the first connection wiring section 53A, the second connection wiring section 53B, and the third connection wiring section 53C, respectively. By arranging the first solar cell string 2A, the second solar cell string 2B, and the third solar cell string 2C so that they are substantially parallel, they can be arranged at substantially equal intervals. As a result, by adjusting the spacing of the connection wiring sections 53, 53, the spacing between adjacent solar cell strings 2, 2 in the vertical direction Y can be adjusted more easily than in the conventional method, resulting in a better design compared to the conventional method. In addition, the yield can be improved during manufacturing compared to the conventional method. In this context, "substantially parallel" means that the difference between the maximum and minimum spacing is 5% or less of the maximum spacing, or that the angle between the extension of one line and the extension of the other line is 3 degrees or less. For example, if the first solar cell string 2A and the second solar cell string 2B are "substantially parallel," it means that the difference between the maximum and minimum spacing of the first solar cell string 2A and the second solar cell string 2B is 5% or less of the maximum spacing, or that the angle between the extension of the edge of the first solar cell string 2A and the extension of the edge of the second solar cell string 2B line is 3 degrees or less.

[0067] In the solar cell module 1 of this embodiment, it is preferable that the first connection wiring section 53A, the second connection wiring section 53B, and the third connection wiring section 53C extend parallel to each other. This prevents the first connection wiring section 53A, the second connection wiring section 53B, and the third connection wiring section 53C from intersecting, making short circuits due to contact less likely. Furthermore, since the solar cell strings 2A, 2B, and 2C are arranged regularly, the aesthetic design can be further improved.

[0068] In the solar cell module 1 of this embodiment, it is preferable that the width W1 of the main wiring section 52 is larger than the width W2 of the first connecting wiring section 53A. This makes the main wiring section 52 less prone to breakage and allows for stable power generation.

[0069] In the solar cell module 1 of this embodiment, it is preferable that the insulating substrate 50 is colored and of a different color from the wiring pattern 51. This makes it easier to identify breaks in the wiring pattern 51 on the insulating substrate 50.

[0070] In the solar cell module 1 of this embodiment, the solar cell 20 has auxiliary electrode portions 32 and 42 extending in the vertical direction Y, and in the solar cell string 2, as shown in Figure 7, there is a fourth solar cell string 2D that is arranged in parallel with the first solar cell string 2A with a gap in the vertical direction Y, and the direction of current flow in the solar cell 20 of the fourth solar cell string 2D is opposite to the direction of current flow in the solar cell 20 of the first solar cell string 2A, and it is preferable that the auxiliary electrode portion 32 of the solar cell 20 of the first solar cell string 2A is connected to the first connecting wiring portion 53A such that it is aligned in a straight line in the vertical direction Y with the auxiliary electrode portion 42 of the solar cell 20 of the fourth solar cell string 2D. By doing so, the auxiliary electrode portion 32 of the solar cell 20 of the first solar cell string 2A is aligned in a straight line in the vertical direction Y with the auxiliary electrode portion 42 of the solar cell 20 of the fourth solar cell string 2D, which gives the viewer the impression of regular alignment and improves the design.

[0071] In the solar cell module 1 of this embodiment, the solar cell string 2 has a first main surface 4a which is a light-receiving surface, and multiple solar cells 20 are connected in series with overlapping portions. Within the solar cell string 2, as shown in Figure 7, there is a fourth solar cell string 2D which is arranged in parallel with the first solar cell string 2A with a gap in the vertical direction Y, and the direction of current flow in the solar cells 20 of the fourth solar cell string 2D is opposite to the direction of current flow in the solar cells 20 of the first solar cell string 2A. Preferably, the first solar cell string 2A is connected to the first connection wiring section 53A such that, when viewed from the first main surface 4a side, the edges of each solar cell 20 are aligned with the edges of each solar cell 20 of the fourth solar cell string 2D in a straight line (imaginary line L1) in the vertical direction Y. By doing so, the edges of each solar cell 20 in the first solar cell string 2A are aligned in a straight line in the vertical direction Y with the edges of each solar cell 20 in the fourth solar cell string 2D, giving the viewer the impression of regular alignment and resulting in a good design.

[0072] In the solar cell module 1 of this embodiment, it is preferable that the first solar cell string 2A has a group of solar cells 10 in which solar cells 20 are connected in series, and a cell extraction wiring 11 that connects the group of solar cells 10 and the first connection wiring section 53A. This allows for easy connection even if there is a step between the end of the solar cell group 10 on the first connection wiring section 53A side and the first connection wiring section 53A.

[0073] In the solar cell module 1 of this embodiment, the solar cell string 2 includes a fourth solar cell string 2D which is arranged in parallel with the first solar cell string 2A with a gap in the vertical direction Y, the direction of current flow in the solar cells 20 of the fourth solar cell string 2D is opposite to the direction of current flow in the solar cells 20 of the first solar cell string 2A, and the wiring pattern 51 preferably further includes a fourth connecting wiring section 53D which extends horizontally X from the main wiring section 52 and is connected to the fourth solar cell string 2D. This makes it easy to connect the first solar cell string 2A and the fourth solar cell string 2D.

[0074] In the solar cell module 1 of this embodiment, the solar cell string 2 includes a fifth solar cell string 2E arranged in parallel with the fourth solar cell string 2D at a vertical Y-space, and the direction of current flow in the solar cells 20 of the fifth solar cell string 2E is the same as the direction of current flow in the solar cells 20 of the fourth solar cell string 2D. Preferably, the wiring pattern 51 further includes a fifth connecting wiring section 53E that extends horizontally X from the main wiring section 52 and is connected to the fifth solar cell string 2E. In this way, the wiring pattern 51 can electrically connect the fourth solar cell string 2D and the fifth solar cell string 2E in parallel, and power generation is possible even if there is a connection failure between the wiring pattern 51 and one of the solar cell strings 2 of the fourth solar cell string 2D and the fifth solar cell string 2E.

[0075] In the embodiment described above, both ends of the solar cell group 10 in the direction of electrical flow were connected to wiring members 3a and 3b by cell extraction wiring 11 and 12, respectively. However, the present invention is not limited thereto. One end of the solar cell group 10 in the direction of electrical flow may be connected using cell extraction wiring 11 (12), and the other end may be connected directly or via conductive adhesive 21 to wiring member 3b. For example, as shown in Figure 9(a), the solar cell group 10 may have one end connected to a cell extraction wiring 11 connected to the wiring member 3a in the direction of electrical flow, and the other end connected directly or via a conductive adhesive 21 to the second wiring pattern 51A of the second wiring member 3b. This allows for the omission of the cell extraction wiring 12, further reducing costs. Alternatively, both ends of the solar cell group 10 in the direction of electrical flow may be connected directly to the wiring members 3a and 3b via a conductive adhesive 21 (second conductive adhesive). In this case, it is preferable that the wiring members 3a and 3b are inverted, as shown in Figure 9(b). That is, it is preferable that one of the wiring members 3a and 3b is located on the first main surface 4a side with respect to the solar cell group 10, and the other wiring member 3 is located on the second main surface 4b side with respect to the solar cell group 10. This makes it possible to omit the cell extraction wiring 11 and 12, further reducing costs.

[0076] In the embodiment described above, the width W2 of the connection wiring section 53 was equal to the width W7 of the cell extraction wiring 11 and 12 and the width W8 of the solar cell 20, but the present invention is not limited thereto. As shown in Figure 10(a), the width of the connection wiring section 53 may be greater than the width of the cell extraction wiring 11 and 12, or greater than the width of the solar cell 20. By doing so, the cell extraction wiring 11 and 12 can be stably connected to the connection wiring section 53, and a reduction in resistance can also be expected. Similarly, the width of the cell extraction wiring 11 and 12 may be greater than the width of the connection wiring section 53, or greater than the width of the solar cell 20, as shown in Figure 10(b). This allows for stable connection of the solar cell 20 to the cell extraction wiring 11 and 12, and also helps to reduce resistance.

[0077] In the embodiment described above, the width of the connecting wiring section 53 was uniform from the base end side (main wiring section 52 side) to the tip end side (solar cell 20 side), but the present invention is not limited thereto. The width of the connecting wiring section 53 does not have to be uniform from the base end side (main wiring section 52 side) to the tip end side (solar cell 20 side). For example, from the viewpoint of preventing current concentration, the connecting wiring section 53 may be provided with a width-changing section 80 in which the width gradually decreases from the base end side to the tip end side, as shown in Figure 10(c). The width-changing section 80 may be provided so that the edge of the connecting wiring section 53 is in the shape of the hypotenuse of a right triangle, or it may be provided in the shape of an arc.

[0078] In the embodiment described above, the negative and positive terminals of the solar cell string 2 were connected by a single wiring member 3, but the present invention is not limited thereto. The negative and positive terminals of the solar cell string 2 may be connected by multiple wiring members 3. For example, as shown in Figure 11, the wiring members 3A and 3B connecting the forward string 2F and the wiring members 3C and 3D connecting the reverse string 2R may be separate. In this case, the wiring members 3B and 3D may be connected by a conductive member 81 such as metal foil to connect the forward string 2F and the reverse string 2R in series, or the wiring members 3B and 3D may be connected directly. In this case, the solar cell string 2 includes a fifth solar cell string 2E that is spaced vertically Y apart from the fourth solar cell string 2D, and has a second wiring member 3D that electrically connects the fourth solar cell string 2D and the fifth solar cell string 2E. The second wiring member 3D has a second wiring pattern 51D formed on a second insulating substrate 50D, and the second wiring pattern 51D has a second main wiring section 52D that extends vertically Y, and extends horizontally X from the second main wiring section 52D to the fourth solar cell string 2D The first solar cell string 2A has a fourth connection wiring section 53D connected to the first connection wiring section 53A, and a fifth connection wiring section 53E extending laterally in the X direction from the second main wiring section 52D and connected to the fifth solar cell string 2E. The first solar cell string 2A is connected with an overlap to the first connection wiring section 53A, and the fourth solar cell string 2D is connected with an overlap to the fourth connection wiring section 53D. It is preferable that the overlap width between the first solar cell string 2A and the first connection wiring section 53A differs from the overlap width between the fourth solar cell string 2D and the fourth connection wiring section 53D. In this way, the misalignment between the first solar cell string 2A and the fourth solar cell string 2D can be adjusted by the overlap width. Furthermore, when connecting wiring members 3B and 3D, engaging portions 82a and 82b may be provided at the ends of the wiring members 3B and 3D in the vertical direction Y, as shown in Figure 12. The engaging portions 82a and 82b may be hooks that interlock with each other in the lateral direction X, as shown in Figure 12(a); or, as shown in Figure 12(b), the engaging portion 82a may be a recessed portion that is recessed in the direction of expansion of the insulating substrate 50, and the engaging portion 82b may be a convex portion that protrudes in the direction of expansion of the insulating substrate 50, and they may engage in the surface direction; or, as shown in Figure 12(c), the engaging portion 82a may be a convex portion that protrudes in the thickness direction, and the engaging portion 82b may be a hole that is a bottomed hole or through hole with depth in the thickness direction.

[0079] 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]

[0080] 1. Solar cell module 2 Solar cell strings 2A First Solar Cell String 2B Second Solar Cell String 2C Third Solar Cell String 2D 4th Solar String 2E 5th Solar String 2F Forward String 2R Reverse String 3,3A~3C,3a Wiring components 3D Second Wiring Component 3b Second wiring component 4a 1st principal surface (light receiving surface) 10 Solar cell group (series cell group) Wiring for 11 and 12 cells 20,20Fa,20Fb,20Fc,20Fd,20Ra,20Rb,20Rc,20Rd solar cells 21 Conductive adhesive (second conductive adhesive) 32 1st auxiliary electrode section 42 2nd auxiliary electrode section 50 Insulating substrate 50D Second insulating substrate 51, 51a~51c Wiring Pattern 51A Second Wiring Pattern 51D Second Wiring Pattern 52 Main Wiring Section 52D Second Main Wiring Section 53 Connection Wiring Section 53A First connection wiring section 53B Second connection wiring section 53C Third connection wiring section 53D Fourth Connection Wiring Section 53E Fifth connection wiring section 80 Width change section

Claims

1. A solar cell module having multiple solar cell strings, each including a series cell group in which multiple solar cells are connected in series so as to be aligned in a first direction, wherein the solar cell strings are sealed by being sandwiched between a first sealing member and a second sealing member, The aforementioned solar cell string includes a first solar cell string, a second solar cell string, and a third solar cell string, which are arranged side by side with a gap between them in the second direction. The first solar cell string, the second solar cell string, and the third solar cell string are electrically connected in parallel by a wiring member. The aforementioned wiring member has a wiring pattern formed on an insulating substrate. The wiring pattern includes a main wiring section extending in the second direction, a first connecting wiring section extending from the main wiring section in the first direction and connected to the first solar cell string, a second connecting wiring section extending from the main wiring section in the first direction and connected to the second solar cell string, and a third connecting wiring section extending from the main wiring section in the first direction and connected to the third solar cell string. A solar cell module in which the distance between the first connection wiring section and the second connection wiring section is substantially equal to the distance between the second connection wiring section and the third connection wiring section.

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

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

4. The solar cell module according to claim 1, wherein the insulating substrate is colored and of a different color from the wiring pattern.

5. The solar cell has an auxiliary electrode portion extending in the second direction, Among the aforementioned solar cell strings, there is a fourth solar cell string that is arranged in parallel with respect to the first solar cell string at a distance in the second direction, The direction of current flow in the solar cells of the fourth solar cell string is opposite to the direction of current flow in the solar cells of the first solar cell string. The solar cell module according to claim 1, wherein the auxiliary electrode portion of the solar cell in the first solar cell string is connected to the first connecting wiring portion such that it is aligned in a straight line with the auxiliary electrode portion of the solar cell in the fourth solar cell string in the second direction.

6. Having a light-receiving surface, The aforementioned series cell group consists of multiple solar cells connected in series with overlapping portions. Among the aforementioned solar cell strings, there is a fourth solar cell string that is arranged in parallel with respect to the first solar cell string at a distance in the second direction, The direction of current flow in the solar cells of the fourth solar cell string is opposite to the direction of current flow in the solar cells of the first solar cell string. The solar cell module according to claim 1, wherein the first solar cell string is connected to the first connecting wiring section such that, when viewed from the light-receiving surface side in a plan view, the edge of each solar cell aligns in a straight line with the edge of each solar cell of the fourth solar cell string in a second direction.

7. Among the aforementioned solar cell strings, there is a fifth solar cell string that is arranged in parallel with the fourth solar cell string at a distance from it in the second direction. The fourth solar cell string and the fifth solar cell string are electrically connected by a second wiring member, The second wiring member has a second wiring pattern formed on a second insulating substrate. The second wiring pattern includes a second main wiring section extending in the second direction, a fourth connecting wiring section extending from the second main wiring section in the first direction and connected to the fourth solar cell string, and a fifth connecting wiring section extending from the second main wiring section in the first direction and connected to the fifth solar cell string. The first solar cell string is connected to the first connecting wiring section with an overlap, The fourth solar cell string is connected to the fourth connecting wiring section with an overlap, The solar cell module according to claim 5 or 6, wherein the overlap width between the first solar cell string and the first connecting wiring portion is different from the overlap width between the fourth solar cell string and the fourth connecting wiring portion.

8. The solar cell module according to any one of claims 1 to 6, wherein the first solar cell string has a series cell group in which solar cells are connected in series, and cell extraction wiring connecting the series cell group and the first connection wiring section.

9. The second wiring member has a second wiring pattern formed on a second insulating substrate, The solar cell module according to claim 8, wherein, in the direction of electrical flow, one end of the series cell group is connected to the cell extraction wiring, and the other end is connected directly or via a conductive adhesive to the second wiring pattern of the second wiring member.

10. The solar cell module according to claim 8, wherein the width of the cell extraction wiring is different from the width of the first connection wiring section.

11. The solar cell module according to claim 1, wherein the first connecting wiring section is continuous with the main wiring section and has a width-changing section whose width increases as it moves from the first solar cell string side toward the main wiring section.

12. Among the aforementioned solar cell strings, there is a fourth solar cell string that is arranged in parallel with respect to the first solar cell string at a distance in the second direction, The direction of current flow in the solar cells of the fourth solar cell string is opposite to the direction of current flow in the solar cells of the first solar cell string. The solar cell module according to claim 1, wherein the wiring pattern further comprises a fourth connecting wiring section that extends from the main wiring section in the first direction and is connected to the fourth solar cell string.

13. Among the aforementioned solar cell strings, there is a fifth solar cell string that is arranged in parallel with the fourth solar cell string at a distance from it in the second direction. The direction of current flow in the solar cells of the fifth solar cell string is the same as the direction of current flow in the solar cells of the fourth solar cell string. The solar cell module according to claim 12, wherein the wiring pattern further comprises a fifth connecting wiring section that extends from the main wiring section in the first direction and is connected to the fifth solar cell string.

14. The first solar cell string has a series of cells in which solar cells are connected in series, The second wiring member has a second wiring pattern formed on a second insulating substrate, The series cell group is such that, in the direction of electrical flow, one end is connected directly or via a conductive adhesive to the first connecting wiring portion of the wiring member, and the other end is connected directly or via a second conductive adhesive to the second wiring pattern of the second wiring member. The wiring member is positioned on the side of the first sealing member that is closer to the series cell group. The solar cell module according to any one of claims 1 to 6, wherein the second wiring member is located on the second sealing member side of the series cell group.

15. A wiring member usable in a solar cell module having multiple solar cell strings, each including a series cell group in which multiple solar cells are connected in series so as to be aligned in a first direction, wherein the solar cell strings are sealed by being sandwiched between a first sealing member and a second sealing member, The aforementioned solar cell string includes a first solar cell string, a second solar cell string, and a third solar cell string, which are arranged side by side with a gap between them in the second direction. Having a wiring pattern on an insulating substrate, The aforementioned wiring pattern, when used in the solar cell module, electrically connects the first solar cell string, the second solar cell string, and the third solar cell string in parallel. The wiring pattern, when used in the solar cell module, has a main wiring section extending in the second direction, a first connecting wiring section extending from the main wiring section in the first direction and connected to the first solar cell string, a second connecting wiring section extending from the main wiring section in the first direction and connected to the second solar cell string, and a third connecting wiring section extending from the main wiring section in the first direction and connected to the third solar cell string. A wiring member in which the distance between the first connecting wiring section and the second connecting wiring section is substantially equal to the distance between the second connecting wiring section and the third connecting wiring section.

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