Solar cell module

Abstract

To provide a solar cell module capable of forming stable conduction between solar cells.SOLUTION: There is provided a solar cell module in which a first solar cell and a second solar cell are connected in a first direction with overlapping. The first solar cell has a first collector electrode, and the second solar cell has a second collector electrode adhered to the first collector electrode of the first solar cell via a conductive adhesive. The first collector electrode has a plurality of first electrode wiring sections, and the second collector electrode has a plurality of second electrode wiring sections. In a plan view, the first electrode wiring section and the second electrode wiring section form a plurality of intersection points in a connection area connected by the conductive adhesive, and further the plurality of intersection points are distributed in a planar shape.SELECTED DRAWING: Figure 5

Description

[Technical Field]

[0001] The present invention relates to a solar cell module. [Background technology]

[0002] BACKGROUND ART Solar cell modules in which a plurality of solar cells are connected in a shingled manner by a connecting member containing conductive particles have been known (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2020 / 158379 Summary of the Invention [Problem to be solved by the invention]

[0004] In the solar cell module of Patent Document 1, the busbar electrodes of the collector electrodes of the solar cells are formed in a rectangular shape, and the busbar electrodes of adjacent solar cells are connected by a conductive adhesive. Since the busbar electrodes are generally made of an expensive metal such as silver, the amount of metal used increases in proportion to the area of ​​the busbar electrodes, resulting in increased costs. Therefore, reducing the amount of metal in the busbar electrodes is desirable to reduce the cost of solar cell modules.

[0005] Therefore, the present inventors attempted to reduce the amount of metal used in the busbar electrodes by thinning the busbar electrodes and fabricating a prototype solar cell module in which the thinned busbar electrodes were stacked. In this prototype solar cell module, the busbar electrode area was reduced by thinning the busbar electrode, which reduced the amount of metal used and significantly reduced costs compared to conventional methods. However, because the area of ​​the busbar electrode portions is smaller, the positions of the busbar electrodes of adjacent solar cells need to be aligned more precisely than in conventional solar cell modules. If the positions of the busbar electrodes of adjacent solar cells are misaligned, the distance between the busbar electrodes increases, resulting in problems such as increased resistance or a loss of conductivity between the busbar electrodes.

[0006] Therefore, an object of the present invention is to provide a solar cell module that can provide stable electrical continuity between solar cells. [Means for solving the problem]

[0007] One aspect of the present invention for solving the above-mentioned problems is a solar cell module in which a first solar cell and a second solar cell are connected in a first direction with an overlap, wherein the first solar cell has a first collector electrode, the second solar cell has a second collector electrode adhered to the first collector electrode of the first solar cell via a conductive adhesive, the first collector electrode has a plurality of first electrode wiring portions, and the second collector electrode has a plurality of second electrode wiring portions, and when viewed in a plane, in a connection region connected by the conductive adhesive, the first electrode wiring portions and the second electrode wiring portions form a plurality of intersections, and further the plurality of intersections are distributed in a planar pattern.

[0008] According to this aspect, the first electrode wiring portion and the second electrode wiring portion form multiple intersections and are bonded together with a conductive adhesive so as to include the multiple intersections, so that multiple conductive paths are formed between the first electrode wiring portion and the second electrode wiring portion, ensuring more reliable conduction.

[0009] In a preferred aspect, among the plurality of first electrode wiring portions, there is a second direction wiring portion that extends in a second direction perpendicular to the first direction when viewed in a plane, and among the plurality of second electrode wiring portions, there is a second direction wiring portion that extends in the second direction when viewed in a plane, and a central axis of the second direction wiring portion of the first collector electrode is shifted in the first direction with respect to a central axis of the second direction wiring portion of the second collector electrode.

[0010] In a preferred aspect, the plurality of second electrode wiring portions include adjacent second direction wiring portions, and the width of the second direction wiring portion of the first collector electrode is greater than the distance between the adjacent second direction wiring portions of the second collector electrode.

[0011] In a preferred aspect, among the plurality of second electrode wiring portions, there is an inclined wiring portion that, when viewed in a plane, extends at an angle with a component in the first direction and a component in a second direction perpendicular to the first direction, and the inclined wiring portion forms an intersection with the first electrode wiring portion in the connection region when viewed in a plane.

[0012] In a preferred aspect, among the plurality of first electrode wiring portions, there is a second direction wiring portion that extends in a second direction perpendicular to the first direction, at a position outside the connection area in the first direction and closer to the center of the second solar cell than the connection area.

[0013] In a preferred aspect, among the plurality of first electrode wiring portions, there is a first direction wiring portion that extends in the first direction when viewed in a plane, and among the plurality of second electrode wiring portions, there is a first direction wiring portion that extends in the first direction when viewed in a plane, and a central axis of the first direction wiring portion of the first collector electrode is shifted in a second direction perpendicular to the first direction with respect to a central axis of the first direction wiring portion of the second collector electrode. [Effects of the Invention]

[0014] According to the solar cell module of the present invention, stable conduction can be achieved between the solar cells. [Brief explanation of the drawings]

[0015] [Figure 1] 1A and 1B are explanatory diagrams of a solar cell module according to a first embodiment of the present invention, in which (a) is a perspective view of the solar cell module, and (b) is a cross-sectional view taken along line AA of (a), in which hatching of the light-receiving-side sealing material and the back-surface-side sealing material has been omitted for ease of understanding. [Figure 2]2A and 2B are explanatory views of the solar cell of FIG. 1, in which (a) is a cross-sectional perspective view seen from the first main surface side, and (b) is a cross-sectional perspective view seen from the second main surface side. [Figure 3] FIG. 3 is a plan view of the solar cell of FIG. 2 as viewed from the first main surface side. [Figure 4] 3 is a plan view of the solar cell of FIG. 2 as viewed from the second main surface side. FIG. [Figure 5] 2 is a plan view of a main part of the solar cell module of FIG. 1, in which a first solar cell is indicated by a solid line and a second solar cell is indicated by a two-dot chain line. [Figure 6] 10A and 10B are explanatory diagrams of the main parts of a solar cell module according to a second embodiment of the present invention, in which (a) is a plan view of the main parts viewed from the first main surface side of the solar cell, and (b) is a plan view of the main parts viewed from the second main surface side of the solar cell. [Figure 7] 7 is a plan view of a main part of the solar cell module of FIG. 6, in which a first solar cell is indicated by a solid line and a second solar cell is indicated by a two-dot chain line. [Figure 8] 10A and 10B are explanatory diagrams of the main parts of a solar cell module according to a third embodiment of the present invention, in which (a) is a plan view of the main parts viewed from the first main surface side of the solar cell, and (b) is a plan view of the main parts viewed from the second main surface side of the solar cell. [Figure 9] 8 is a plan view of a main part of the solar cell module of FIG. 7, in which a first solar cell is indicated by a solid line and a second solar cell is indicated by a two-dot chain line. DETAILED DESCRIPTION OF THE INVENTION

[0016] Hereinafter, embodiments of the present invention will be described in detail.

[0017] The solar cell module 1 of the first embodiment of the present invention is a plate-like panel having a first main surface as a light-receiving surface 2 and a second main surface as a back surface 3, as shown in FIG. 1(a). As shown in FIG. 1, the solar cell module 1 includes a light-receiving-side sealing member 5, solar cell strings 6 (6a to 6c), wiring members 7, and a back-side sealing member 8, and the solar cell strings 6 and wiring members 7 are sandwiched and sealed between the light-receiving-side sealing member 5 and the back-side sealing member 8. When light is incident on the light receiving surface 2 of the solar cell module 1, the solar cell strings 6a to 6c inside the module 1 can generate electricity.

[0018] <Light receiving side sealing member 5> As shown in FIG. 1, the light-receiving-side sealing member 5 covers the light-receiving surface 2 side of the solar cell string 6, and includes, in order from the solar cell string 6 side, a light-receiving-side sealing material 10 and a light-receiving-side sealing substrate 11.

[0019] The light-receiving-side sealing material 10 is a translucent insulating sealing material that has sealing properties, insulating properties, and light-transmitting properties, and is an adhesive material that bonds the solar cell strings 6 and wiring members 7 to the light-receiving-side sealing substrate 11. The light-receiving-side sealing material 10 is not particularly limited as long as it has sealing, insulating, and light-transmitting properties, and for example, a resin sealing material such as polyolefin elastomer can be used.

[0020] The light-receiving-side sealing substrate 11 is a light-transmitting insulating substrate that has sealing properties, insulating properties, and light-transmitting properties, and is a member that constitutes the light-receiving surface 2. The light-receiving side sealing substrate 11 is not particularly limited as long as it has sealing, insulating, and light-transmitting properties, and for example, a glass substrate such as float glass or colored glass can be used.

[0021] <Solar cell string 6> 1, the solar cell string 6 is formed by connecting a plurality of solar cells 20 in a single ring via a conductive adhesive 21. That is, the solar cell string 6 has a plurality of solar cells 20 connected in series via the conductive adhesive 21.

[0022] (Solar cell 20) 1 and 2, the solar cell 20 is a plate-like body having a first main surface 22 and a second main surface 23, and when viewed in plan, is a small rectangular panel having two opposing sides 25 and 26. The solar cell 20 of this embodiment is a horizontally elongated rectangular panel with the horizontal direction X (second direction) as the longitudinal direction and the vertical direction Y (first direction) as the lateral direction.

[0023] As shown in FIG. 2, the solar cell 20 has a first collector electrode 30 provided on the first main surface 22 and a second collector electrode 31 provided on the second main surface .

[0024] (1st collector electrode 30) As shown in FIGS. 2(a) and 3, the first collector electrode 30 includes a first bus bar electrode portion 40, a first finger electrode portion 41, and a first auxiliary electrode portion .

[0025] As shown in FIG. 3, the first busbar electrode portion 40 is an electrode portion provided along the horizontal side 25 in the vicinity of the horizontal side 25, and includes a first horizontal wiring portion 50 (50a to 50g) (first electrode wiring portion, second direction wiring portion) and a first vertical wiring portion 51 (51a to 51e) (first electrode wiring portion, first direction wiring portion).

[0026] As shown in FIG. 3, the first horizontal wiring portions 50 (50a to 50g) are parallel wiring portions that extend parallel to the horizontal sides 25, and extend in the horizontal direction X (second direction). The first horizontal wiring portions 50a to 50g are arranged in parallel in the vertical direction Y at intervals. Among the first horizontal wiring portions 50a to 50g, the inner first horizontal wiring portions 50b to 50f are connection wiring portions that are coated with the conductive adhesive material 21 and belong to the connection region 90. The width of the first horizontal wiring portions 50a to 50g is preferably 5 mm or more and 10 mm or less.

[0027] The first horizontal wiring portions 50b to 50f are arranged at equal intervals in the vertical direction Y, and the first horizontal wiring portions 50a, 50g located further outward of the first horizontal wiring portions 50b to 50f in the vertical direction Y are spaced farther from the adjacent first horizontal wiring portions 50b, 50f than the spacing between the other first horizontal wiring portions 50b to 50f. The interval between the first horizontal wiring portions 50b to 50f, which are connection wiring portions, is preferably 0.05 mm or more and 0.5 mm or less.

[0028] The first vertical wiring portions 51 (51a to 51e) are orthogonal wiring portions that extend in a direction orthogonal to the horizontal side 25, and extend in the vertical direction Y (first direction). The first vertical wiring portions 51a to 51e are arranged in parallel at intervals in the horizontal direction X, and intersect with the first horizontal wiring portions 50a to 50g, respectively, to form a lattice pattern. The width of the first vertical wiring portion 51 is preferably larger than the width of the first finger electrode portion 41 .

[0029] As shown in FIG. 3, the first finger electrode portion 41 is an orthogonal wiring portion extending from the first bus bar electrode portion 40 toward the horizontal side 26 in a direction orthogonal to the horizontal side 25, and is a vertical wiring portion extending in the vertical direction Y. The first finger electrode portions 41 are provided corresponding to the first vertical wiring portions 51, and are aligned in a straight line with the first vertical wiring portions 51 to form a continuous series of wiring.

[0030] As shown in Figure 3, the first auxiliary electrode portion 42 is a parallel electrode portion that is located inside the first busbar electrode portion 40 (towards the horizontal side 26) and extends parallel to the horizontal side 25, and is a marker electrode portion that functions as a marker for positioning other solar cell 20 when connecting to other solar cell 20.

[0031] (Second collector electrode 31) The second collector electrode 31 includes a second bus bar electrode portion 60, a second finger electrode portion 61, and a second auxiliary electrode portion 62, as shown in FIGS.

[0032] As shown in FIG. 4, the second busbar electrode portion 60 is an electrode portion provided along the horizontal side 26 in the vicinity of the horizontal side 26, and includes a second horizontal wiring portion 70 (70a to 70c) (second electrode wiring portion, second direction wiring portion), a second vertical wiring group 71 (71a to 71e), a first inclined wiring group 72 (72a to 72e), and a second inclined wiring group 73 (73a to 73e).

[0033] The second horizontal wiring portions 70 (70a to 70c) are parallel wiring portions that extend in parallel to the horizontal sides 26 in the horizontal direction X. Of the second horizontal wiring portions 70a to 70c, the central second horizontal wiring portion 70b is a connection wiring portion that is coated with the conductive adhesive material 21 and belongs to the connection region 90. The width of the second horizontal wiring portion 70b is preferably larger than the widths of the other second horizontal wiring portions 70a, 70c, and is preferably larger than the spacing between the first horizontal wiring portions 50b to 50f of the first bus bar electrode portion 40 (see Figure 3). The width of the second horizontal wiring portion 70b is preferably 0.1 mm or more and 0.5 mm or less. The width of the remaining second horizontal wiring portions 70a and 70c is preferably 0.05 mm or more and 0.5 mm or less.

[0034] The second vertical wiring group 71 is made up of a plurality of second vertical wiring portions 75a to 75c (second electrode wiring portions, first direction wiring portions) extending in a direction perpendicular to the horizontal side 26, as shown in FIG. 2(b). The second vertical wiring portions 75a to 75c constituting the second vertical wiring group 71 are arranged at intervals in the horizontal direction X and are parallel to one another. The intervals between the second vertical wiring portions 75a to 75c are preferably narrower than the width of the first vertical wiring portion 51 of the first bus bar electrode portion 40.

[0035] As shown in FIG. 2(b), the first inclined wiring group 72 is made up of a plurality of first inclined wiring portions 76a to 76c (second electrode wiring portions, inclined wiring portions) that extend at an incline with a horizontal component and a vertical component. The first inclined wiring portions 76a to 76c constituting the first inclined wiring group 72 are arranged side by side at intervals in a direction perpendicular to the extension direction of the first inclined wiring portions 76a to 76c, and are parallel to each other.

[0036] As shown in FIG. 2(b), the second inclined wiring group 73 is made up of a plurality of second inclined wiring portions 77a to 77c (second electrode wiring portions, inclined wiring portions) that extend at an incline with a horizontal component and a vertical component. The second inclined wiring portions 77a to 77c constituting the second inclined wiring group 73 are arranged side by side at intervals in a direction perpendicular to the extension direction of the second inclined wiring portions 77a to 77c, and are parallel to each other.

[0037] As shown in Figures 2(b) and 4, the second inclined wiring group 73 extends in a V-shape together with the first inclined wiring group 72, and the extension lines of each second inclined wiring portion 77a to 77c in the extension direction intersect with the extension lines of each first inclined wiring portion 76a to 76c of the first inclined wiring group 72 in the extension direction.

[0038] In the second bus bar electrode portion 60, the second horizontal wiring portions 70a to 70c are arranged in parallel at intervals in the vertical direction Y, which are equal intervals in this embodiment. The interval between the second horizontal wiring portions 70a, 70c is approximately the same as the interval between the first horizontal wiring portions 50a, 50g of the first bus bar electrode portion 40, and in this embodiment, it is preferable that they are substantially equal. The term "substantially equal" used here does not only mean that they are completely equal, but also includes cases where the difference is 1 μm or less.

[0039] As shown in Figures 2(b) and 4, the second bus bar electrode portion 60 has second vertical wiring groups 71a to 71e, first inclined wiring groups 72a to 72e, and second inclined wiring groups 73a to 73e arranged side by side at intervals in the horizontal direction X. The second horizontal wiring portions 70a to 70c intersect with the second vertical wiring groups 71a to 71e, the first inclined wiring groups 72a to 72e, and the second inclined wiring groups 73a to 73e.

[0040] As shown in FIG. 4, the second finger electrode portion 61 is an orthogonal wiring portion that extends from the second bus bar electrode portion 60 toward the horizontal side 25 and is perpendicular to the horizontal side 26, and is a vertical wiring portion that extends in the vertical direction Y. The second finger electrode portion 61 is provided corresponding to the second vertical wiring portion 75b located on the center side of each of the second vertical wiring groups 71a to 71e, and is aligned in a straight line with each second vertical wiring portion 75b to form a continuous series of wiring.

[0041] As shown in Figure 4, the second auxiliary electrode portion 62 is a parallel electrode portion that is located more inward (towards the horizontal side 25) than the second busbar electrode portion 60 and extends parallel to the horizontal side 26, and is a marker electrode portion that functions as a marker for positioning other solar cell 20 when connecting to other solar cell 20.

[0042] (Conductive adhesive 21) The conductive adhesive 21 is a conductive member having electrical conductivity, and is an adhesive that connects the bus bar electrode portions 40, 60 of the adjacent solar cells 20, 20 together. The conductive adhesive 21 of this embodiment is a conductive paste containing conductive particles. The conductive particles are not particularly limited as long as they are conductive, and for example, gold particles, silver particles, copper particles, platinum particles, etc. can be used.

[0043] <Wiring component 7> As shown in FIG. 1(a), the wiring member 7 is connected to each solar cell string 6 and serves as an output wiring for extracting electric power from each solar cell string 6 to the outside.

[0044] <Back side sealing member 8> As shown in FIG. 1, the back surface side sealing member 8 covers the back surface 3 side of the solar cell string 6, and includes a back surface side sealing material 80 and a back surface side sealing substrate 81.

[0045] The back surface side sealing material 80 is an insulating sealing material having sealing and insulating properties, and is an adhesive material that bonds the solar cell strings 6 and wiring members 7 to the back surface side sealing substrate 81, as shown in FIG. The back surface sealing material 80 is not particularly limited as long as it has sealing and insulating properties, and for example, a resin sealing material such as polyolefin elastomer can be used.

[0046] The rear surface side sealing substrate 81 is an insulating substrate having sealing and insulating properties, and is a member that constitutes the rear surface 3 . The back surface sealing substrate 81 is not particularly limited as long as it has sealing and insulating properties, and for example, a glass substrate such as float glass can be used.

[0047] Next, the positional relationship between the various parts of the solar cell module 1 of this embodiment will be described.

[0048] As shown in FIG. 1, the solar cell module 1 has a plurality of solar cell strings 6 (6a to 6c) arranged side by side in the lateral direction X at intervals. Of the solar cells 20 that make up the solar cell string 6, focusing on three adjacent solar cells 20A to 20C shown in Figure 1(b), the second solar cell 20B has the first busbar electrode portion 40 of the first collector electrode 30 connected to the second busbar electrode portion 60 of the second collector electrode 31 of the third solar cell 20C via a conductive adhesive 21, and the second busbar electrode portion 60 of the second collector electrode 31 connected to the first busbar electrode portion 40 of the first collector electrode 30 of the first solar cell 20A via a conductive adhesive 21.

[0049] As shown in Figure 5, the solar cell string 6 is configured such that adjacent solar cells 20A, 20B are connected with an overlap, and a connection region 90 in which conductive adhesive 21 is arranged is formed at the overlapping portion of the adjacent solar cells 20A, 20B.

[0050] As shown in FIG. 3, the connection region 90 is formed in a planar shape in the solar cell 20A, and includes most of the first bus bar electrode portion 40. The term "majority" here means more than 50% of the total, and the same applies hereinafter.

[0051] As shown in FIG. 3, the conductive adhesive 21 provided on the solar cell 20A is provided across at least the first vertical wiring portions 51a to 51e in the horizontal direction X, and preferably extends to both end portions. The conductive adhesive 21 provided on the solar cell 20A is preferably provided across the first horizontal wiring portions 50b to 50f in the vertical direction Y, as shown in FIG. 3, and is preferably provided between the first horizontal wiring portions 50a and 50g.

[0052] As shown in FIG. 4, the connection region 90 includes most of the second bus bar electrode portions 60 in the solar cell 20B.

[0053] As shown in FIG. 4, the conductive adhesive 21 provided on the solar cell 20B is provided in the horizontal direction X, spanning at least the first inclined wiring group 72a to the second inclined wiring group 73e, and preferably is provided to both end portions. As shown in FIG. 4, the conductive adhesive 21 provided on the solar cell 20B is provided in the vertical direction Y so as to include at least the second horizontal wiring portion 70b, and is preferably provided between the second horizontal wiring portions 70a and 70c.

[0054] As shown in FIG. 5, in a plan view of the solar cell 20A and the solar cell 20B, the first bus bar electrode portion 40 and the second bus bar electrode portion 60 overlap in the connection region 90. In solar cell 20A, the first horizontal wiring portion 50a overlaps with the second horizontal wiring portion 70c of solar cell 20B, the first horizontal wiring portion 50d overlaps with the second horizontal wiring portion 70b of solar cell 20B, and the first horizontal wiring portion 50g overlaps with the second horizontal wiring portion 70a of solar cell 20B. The first vertical wiring portion 51 of the solar cell 20A overlaps with the second vertical wiring portion 75b of the second vertical wiring group 71 of the solar cell 20B.

[0055] In the connection region 90 of the solar cell 20A, the first horizontal wiring portions 50b, 50c, 50e, and 50f cross over and under the wiring portions 75-77 of the wiring groups 71-73 of the solar cell 20B, forming a plurality of intersections. The intersections of the first horizontal wiring portions 50b, 50c, 50e, 50f of the solar cell 20A and the respective wiring portions 75-77 of the wiring groups 71-73 of the solar cell 20B are distributed in a planar fashion in the connection region 90. The first horizontal wiring portions 50b, 50c, 50e, and 50f of the solar cell 20A and the respective wiring portions 75 to 77 of each wiring group 71 to 73 of the solar cell 20B form conductive paths at their intersections that can be electrically conductive directly or via conductive adhesive 21. In the solar cell module 1, the first horizontal wiring portions 50a, 50g of the solar cell 20A are located outside the connection area 90 in the vertical direction Y (overlapping direction), and the second horizontal wiring portions 70a, 70c of the solar cell 20A are also located outside the connection area 90. When viewed from the first main surface 22 side of solar cell 20A, first auxiliary electrode portion 42 of solar cell 20A does not overlap with solar cell 20B and is exposed from solar cell 20B. In other words, first auxiliary electrode portion 42 of solar cell 20A is visible when viewed from the first main surface 22 side of solar cell 20A. When viewed from the second main surface 23 side of solar cell 20A, second auxiliary electrode portion 62 of solar cell 20B does not overlap with solar cell 20A and is exposed from solar cell 20A. In other words, second auxiliary electrode portion 62 of solar cell 20B is visible when viewed from the second main surface 23 side of solar cell 20A.

[0056] According to the solar cell module 1 of the first embodiment, in a plan view, in a connection region 90 connected by the conductive adhesive 21, the wiring portions 50b to 50f, 51a to 51e constituting the first busbar electrode portion 40 and the wiring portions 70b, 75a to 75c, 76a to 76c, 77a to 77c constituting the second busbar electrode portion 60 form multiple intersections, and these intersections are distributed in a planar pattern. That is, the first busbar electrode portion 40 and the second busbar electrode portion 60 form multiple intersections, and are bonded by the conductive adhesive 21 so as to include the multiple intersections in the connection region 90. This forms multiple conductive paths between the first busbar electrode portion 40 and the second busbar electrode portion 60, ensuring more reliable conduction.

[0057] According to the solar cell module 1 of the first embodiment, the central axes of the first horizontal wiring portions 50b, 50c, 50e, and 50f of the first busbar electrode portion 40 are shifted in the vertical direction Y with respect to the central axis of the second horizontal wiring portion 70b of the second busbar electrode portion 60. This makes it easy to form distributed intersections between the first busbar electrode portions 40 and the second busbar electrode portions 60.

[0058] According to the solar cell module 1 of the first embodiment, the width of the second horizontal wiring portion 70b of the second busbar electrode portion 60 is larger than the distance between adjacent first horizontal wiring portions 50b, 50c (first horizontal wiring portions 50c, 50d, first horizontal wiring portions 50d, 50e, first horizontal wiring portions 50e, 50f) of the first busbar electrode portion 40. Therefore, when the second horizontal wiring portion 70b of the second busbar electrode portion 60 is positioned between the first horizontal wiring portions 50b, 50f, it always overlaps with one of the first horizontal wiring portions 50b to 50f of the first busbar electrode portion 40, which eliminates the need for precise alignment and facilitates assembly.

[0059] According to the solar cell module 1 of the first embodiment, the inclined wiring portions 76a-76c, 77a-77c of the second bus bar electrode portion 60 form intersections with the first horizontal wiring portions 50b, 50c, 50e, 50f of the first bus bar electrode portion 40 in the connection region 90 in a plan view. Therefore, it is easy to form intersections between the first bus bar electrode portion 40 and the second bus bar electrode portion 60.

[0060] According to the solar cell module 1 of the first embodiment, the first bus bar electrode portion 40 of the first solar cell 20A includes a first horizontal wiring portion 50a extending in the horizontal direction X at a position outside the connection region 90 in the vertical direction Y and closer to the center of the second solar cell 20B than the connection region 90. Therefore, potential distribution is unlikely to occur in the horizontal direction X of the first bus bar electrode portion 40.

[0061] According to the solar cell module 1 of the first embodiment, the central axis of the first vertical wiring portion 51 of the first bus bar electrode portion 40 is shifted in the horizontal direction X with respect to the central axes of the second vertical wiring portions 75 a, 75 c of the second bus bar electrode portion 60. This makes it easy to form distributed intersections between the first bus bar electrode portions 40 and the second bus bar electrode portions 60.

[0062] According to the solar cell module 1 of the first embodiment, the width of the first vertical wiring portion 51 of the first bus bar electrode portion 40 is greater than the distance between adjacent second vertical wiring portions 75a, 75b (75b, 75c) of the second bus bar electrode portion 60. Therefore, when the first vertical wiring portion 51 of the first bus bar electrode portion 40 is positioned between the second vertical wiring portions 75a, 75c, it will necessarily overlap one of the second vertical wiring portions 75a to 75c of the second bus bar electrode portion 60, eliminating the need for precise alignment and facilitating assembly.

[0063] Next, a solar cell module 201 according to a second embodiment of the present invention will be described. Note that the same components as those in the solar cell module 1 according to the first embodiment will be denoted by the same reference numerals and will not be described again. The same applies hereinafter.

[0064] The solar cell module 201 of the second embodiment includes a light-receiving-side sealing member 5, a solar cell string 206, a wiring member 7, and a back-surface-side sealing member 8. The solar cell string 206 of the second embodiment is configured by connecting a plurality of solar cells 220 in a shingled manner via a conductive adhesive material 21. As shown in FIG. 6, the solar cell 220 has a first collector electrode 230 provided on the first main surface 22 and a second collector electrode 231 provided on the second main surface .

[0065] (1st collector electrode 230) As shown in FIG. 6(a), the first collector electrode 230 includes a first bus bar electrode portion 240, a first finger electrode portion 41, and a first auxiliary electrode portion .

[0066] The first bus bar electrode portion 240 includes first horizontal wiring portions 250a, 250b (first electrode wiring portion, second direction wiring portion) and first vertical wiring portions 251a, 251b (first electrode wiring portion, first direction wiring portion).

[0067] The first horizontal wiring portions 250a and 250b are parallel wiring portions that extend parallel to the horizontal side 25 and are horizontal wiring portions that extend in the horizontal direction X.

[0068] The first vertical wiring portions 251a and 251b are orthogonal wiring portions that extend in a direction orthogonal to the horizontal side 25 and are vertical wiring portions that extend in the vertical direction Y. The width of the first vertical wiring portions 251a and 251b is preferably greater than the width of the first finger electrode portion 41.

[0069] In the first bus bar electrode portion 240, the first horizontal wiring portions 250a, 250b are arranged side by side at intervals in the vertical direction Y, and the first vertical wiring portions 251a, 251b are arranged side by side at intervals in the horizontal direction X. In the first bus bar electrode portion 240, the first horizontal wiring portions 250a, 250b intersect with the first vertical wiring portions 251a, 251b, respectively.

[0070] As shown in FIG. 6(b), the second busbar electrode portion 260 includes second horizontal wiring portions 270a, 270b (second electrode wiring portion, second direction wiring portion) and second vertical wiring portions 271a, 271b (second electrode wiring portion).

[0071] The second horizontal wiring portions 270a and 270b are wiring portions that extend parallel to the horizontal side 26 and in the horizontal direction X, as shown in FIG. 6(b).

[0072] The second vertical wiring portions 271a and 271b are wiring portions that extend in a direction perpendicular to the horizontal side 26, and are vertical wiring portions that extend in the vertical direction Y. The width of the second vertical wiring portions 271 a and 271 b is preferably greater than the width of the second finger electrode portions 61 .

[0073] In the second bus bar electrode portion 260, the second horizontal wiring portions 270a, 270b are arranged side by side at intervals in the vertical direction Y, and the second vertical wiring portions 271a, 271b are arranged side by side at intervals in the horizontal direction X. In the second bus bar electrode portion 260, the second horizontal wiring portions 270a, 270b intersect with the second vertical wiring portions 271a, 271b, respectively.

[0074] Next, the positional relationship of each part of the solar cell module 201 of this embodiment will be described.

[0075] As shown in FIG. 7, in the solar cell module 201, a connection region 90 where a conductive adhesive material 21 is arranged is formed in the overlapping portion of adjacent solar cells 220A and 220B.

[0076] As shown in FIG. 7, in solar cell 220A and solar cell 220B, first bus bar electrode portion 240 and second bus bar electrode portion 260 overlap in connection region 90 when viewed in plan. The first horizontal wiring portion 250a of the solar cell 220A crosses the second finger electrode portion 61 of the solar cell 220B in an over-crossing manner, forming a plurality of intersections. The first horizontal wiring portion 250b of the solar cell 220A crosses over the second vertical wiring portions 271a and 271b of the solar cell 220B, forming a plurality of intersections. In the solar cell 220A, the first vertical wiring portions 251a and 251b intersect with the second horizontal wiring portions 270a and 270b in a three-dimensional manner, and a plurality of intersections are formed in the connection region 90. That is, the first collector electrode 230 of the solar cell 220A intersects with the second collector electrode 231 of the solar cell 220B, and the intersections are distributed in a planar manner in the connection region 90.

[0077] Next, a solar cell module 301 according to a third embodiment of the present invention will be described.

[0078] In a solar cell module 301 of the third embodiment, the structure of bus bar electrode portions 340 and 360 differs from the structure of the bus bar electrode portions 240 and 260 of the second embodiment.

[0079] As shown in FIG. 8(a), the first bus bar electrode portion 340 includes first horizontal wiring portions 250a, 250b, first vertical wiring portions 251a, 251b, and a first connection wiring portion 352 (first electrode wiring portion, first direction wiring portion). The first connection wiring portion 352 is a wiring portion that connects the intermediate portions of the first horizontal wiring portions 250a, 250b, is an orthogonal wiring portion that extends in a direction perpendicular to the horizontal side 25, and is a vertical wiring portion that extends in the vertical direction Y.

[0080] As shown in FIG. 8(b), the second busbar electrode portion 360 includes second horizontal wiring portions 270a, 270b, second vertical wiring portions 271a, 271b, and a second connection wiring portion 372 (second electrode wiring portion, first direction wiring portion). The second connection wiring portion 372 is a wiring portion that connects the intermediate portions of the second horizontal wiring portions 270a, 270b, and is a wiring portion that extends in a direction perpendicular to the horizontal side 26 and in the vertical direction Y.

[0081] Next, the positional relationship between the various parts of the solar cell module 301 of this embodiment will be described.

[0082] As shown in FIG. 9, in the solar cell module 301, a connection region 90 where a conductive adhesive material 21 is arranged is formed in the overlapping portion of adjacent solar cells 320A and 320B.

[0083] In solar cell 320A and solar cell 320B, first bus bar electrode portion 340 and second bus bar electrode portion 360 overlap in connection region 90 when viewed in plan. The first connection wiring portion 352 of the solar cell 320A overlaps with the second connection wiring portion 372 of the solar cell 320B. In the solar cell 320A, the first connection wiring portion 352 crosses the second horizontal wiring portion 270b in an over-crossing manner, forming an intersection. The first horizontal wiring portion 250b of the solar cell 320A crosses the second connection wiring portion 372 of the solar cell 320B in an overpass, forming an intersection.

[0084] In the above embodiment, the second vertical wiring group 71 is composed of three second vertical wiring portions 75a to 75c, but the present invention is not limited to this. The second vertical wiring group 71 may be composed of one or two second vertical wiring portions 75, or may be composed of four or more second vertical wiring portions 75. Although the first inclined wiring group 72 is configured by three first inclined wiring portions 76a to 76c, the present invention is not limited to this. The first inclined wiring group 72 may be configured by one or two first inclined wiring portions 76, or may be configured by four or more first inclined wiring portions 76. Although the second inclined wiring group 73 is configured by three second inclined wiring portions 77a to 77c, the present invention is not limited to this. The second inclined wiring group 73 may be configured by one or two second inclined wiring portions 77, or may be configured by four or more second inclined wiring portions 77.

[0085] In the above embodiment, three solar cell strings 6 are provided, but the present invention is not limited to this. One or two solar cell strings 6 may be provided, or four or more solar cell strings 6 may be provided.

[0086] In the above embodiment, each solar cell string 6 is configured with 16 solar cells 20, but the present invention is not limited to this. Each solar cell string 6 may be configured with 1 to 15 solar cells 20, or may be configured with 17 or more solar cells 20. In the above embodiment, each solar cell string 6 is configured with the same number of solar cells 20, but the present invention is not limited to this. Each solar cell string 6 may be configured with a different number of solar cells 20.

[0087] In the above embodiment, the solar cell strings 6 are arranged in the horizontal direction X, but the present invention is not limited to this. The solar cell strings 6 may be arranged in the vertical direction Y.

[0088] In the above embodiment, crystalline solar cells are used as the solar cells 20, but the present invention is not limited to this. Other types of solar cells may also be used as the solar cells 20.

[0089] In the second embodiment described above, the first bus bar electrode portion 240 includes two first horizontal wiring portions 250a and 250b, but the present invention is not limited to this. The first bus bar electrode portion 240 may include three or more first horizontal wiring portions 250. Similarly, although the second bus bar electrode portion 260 includes two second horizontal wiring portions 270a and 270b, the present invention is not limited to this. The second bus bar electrode portion 260 may include three or more second horizontal wiring portions 270.

[0090] In the third embodiment described above, the first bus bar electrode portion 340 includes one first connection wiring portion 352, but the present invention is not limited to this. The first bus bar electrode portion 340 may include a plurality of first connection wiring portions 352. In this case, the first connection wiring portion 352 is preferably disposed at an interval between the first vertical wiring portions 251a and 251b. Similarly, although the second busbar electrode portion 360 includes one second connection wiring portion 372, the present invention is not limited to this. The second busbar electrode portion 360 may include a plurality of second connection wiring portions 372. In this case, it is preferable that the second connection wiring portions 372 are arranged at intervals between the second vertical wiring portions 271a, 271b.

[0091] In the above-described embodiments, each component can be freely substituted or added between the respective embodiments as long as it falls within the technical scope of the present invention. [Explanation of symbols]

[0092] 1,201,301 solar cell modules 20A, 220A, 320A 1st solar cell 20B, 220B, 320B Second solar cell 21 Conductive adhesive 30,230,330 1st collector electrode 31,231,331 2nd collector electrode 50,50a~50g,250,250a,250b 1st horizontal wiring part (1st electrode wiring part, 2nd direction wiring part) 51, 51a to 51e, 251a, 251b First vertical wiring section (first electrode wiring section, first direction wiring section) 70,70a~70c,270,270a,270b 2nd horizontal wiring part (2nd electrode wiring part, 2nd direction wiring part) 75, 75a to 75c: Second vertical wiring section (second electrode wiring section, first direction wiring section) 76,76a~76c 1st inclined wiring part (2nd electrode wiring part, inclined wiring part) 77,77a~77c 2nd inclined wiring part (2nd electrode wiring part, inclined wiring part) 90 Connection Area 271a, 271b Second vertical wiring section (second electrode wiring section) 352 First connection wiring portion (first electrode wiring portion, first direction wiring portion) 372 Second connection wiring section (second electrode wiring section, first direction wiring section)

Claims

1. A solar cell module in which a first solar cell and a second solar cell are connected in a first direction with overlapping each other, the first solar cell has a first collector electrode; the second solar cell has a second collector electrode that is bonded to the first collector electrode of the first solar cell via a conductive adhesive; the first collector electrode has a plurality of first electrode wiring portions, the second collector electrode has a plurality of second electrode wiring portions, A solar cell module, wherein, when viewed in a plane, in a connection region connected by the conductive adhesive, the first electrode wiring portion and the second electrode wiring portion form a plurality of intersections, and the plurality of intersections are further distributed in a planar pattern.

2. Among the plurality of first electrode wiring portions, there is a second direction wiring portion extending in a second direction perpendicular to the first direction in a plan view, Among the plurality of second electrode wiring portions, there is a second direction wiring portion that extends in the second direction when viewed in a plan view, The solar cell module according to claim 1 , wherein a central axis of the second direction wiring portion of the first collector electrode is shifted in the first direction with respect to a central axis of the second direction wiring portion of the second collector electrode.

3. Among the plurality of second electrode wiring portions, there are adjacent second direction wiring portions, The solar cell module according to claim 2 , wherein a width of the second direction wiring portion of the second collector electrode is larger than a distance between the adjacent second direction wiring portions of the first collector electrode.

4. Among the plurality of second electrode wiring portions, there is an inclined wiring portion that extends in a direction inclined with a component in the first direction and a component in a second direction orthogonal to the first direction when viewed in a plane, 4. The solar cell module according to claim 1, wherein the inclined wiring portion forms an intersection with the first electrode wiring portion in the connection region when viewed in a plan view.

5. The solar cell module according to any one of claims 1 to 3, wherein among the plurality of first electrode wiring portions, there is a second direction wiring portion extending in a second direction perpendicular to the first direction, located outside the connection area in the first direction and closer to the center of the second solar cell than the connection area.

6. Among the plurality of first electrode wiring portions, there is a first direction wiring portion that extends in the first direction in a plan view, Among the plurality of second electrode wiring portions, there is a first direction wiring portion that extends in the first direction in a plan view, 4. The solar cell module according to claim 1, wherein a central axis of the first direction wiring portion of the first collector electrode is shifted in a second direction perpendicular to the first direction with respect to a central axis of the first direction wiring portion of the second collector electrode.

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