JP2007235113A - Solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar cell module which can effectively restrain reduction in the packing efficiency of cells, can prevent breakage of cells caused by routing interconnectors, and can facilitate connection using interconnectors. <P>SOLUTION: A solar cell 10 having a regular hexagonal shape is divided into four at a straight line connecting opposed apexes and a straight line connecting middle points of opposed sides. Two of the divided cells (divided cells 10a) are arranged without being turned upside down so that their oblique sides are opposed to each other, thus configuring a substantially rectangular-shaped unit. Interconnectors 200 are routed from the front surface of one of adjacent two units to the back surface of the other unit. In this way, the interconnectors 200 are electrically connected to the front surface and the back surface of each unit. In this method, routing of the interconnectors 200 from the front surface of one divided cell to the back surface of another divided cell is not performed at a portion where the oblique sides of the divided cells 10a are oppose to each other, thus eliminating the necessity to secure a large clearance at the portion. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a solar cell module, and is particularly suitable for use in increasing the charging efficiency of solar cells.

In recent years, the development and popularization of clean energy sources that do not use petroleum resources have been taken up as a global issue regardless of Japan, against the background of problems such as the depletion of petroleum resources and global warming. The photovoltaic power generation system is attracting attention as it plays a major role in solving such problems because it uses inexhaustible solar energy without emissions such as CO ₂ .

  In such a photovoltaic power generation system, a solar cell module in which several tens of solar cells are arranged in a plane is usually used to protect the solar cells as a power generation source from being damaged while being easily handled. . Here, since the solar cell module can lay solar cells efficiently in a certain area and needs to be easily handled in transportation and installation work, the solar cell module is usually a rectangle having a side of about 1 m.

  On the other hand, since the shape of the ingot (single crystal silicon) used as the substrate material of the solar battery cell is a cylindrical shape due to its manufacturing method, when the cell substrate is generated by slicing it as it is, the solar cell shape is Inevitably circular. In this case, even when solar cells are arranged most efficiently, large gaps are generated between the individual solar cells, as shown in FIGS. 11A-1 and 11A-2, for example. The problem that the filling rate of the photovoltaic cell 10 with respect to the module 20 becomes low arises.

  On the other hand, when the shape of the solar battery cell 10 is square as shown in (b-1) and (b-2) of the figure, the filling rate of the solar battery cell 10 can be increased. However, on the other hand, a useless portion of the ingot 30 that is not used as the substrate 31 (the hatched portion in FIG. 2B-2) becomes large, causing a problem that the utilization efficiency of the ingot is considerably lowered.

  Moreover, if the shape of the photovoltaic cell 10 is a regular hexagon as shown in (c-1) and (c-2) of the same figure, the filling rate of the photovoltaic cell 10 can be increased compared with the case of a circle. And the utilization efficiency of the ingot 30 can be improved compared with the case of a square. However, in this case as well, a gap in which the solar cells 10 cannot be arranged is generated in the solar cell module 20, and there are not a few unnecessary portions of the ingot 30 that cannot be used as the substrate 31.

  On the other hand, the following patent document 1 describes a solar cell module that can simultaneously increase the filling rate of the solar cells 10 and the utilization efficiency of the ingot 30. In this prior invention, as shown in FIG. 12B, a regular hexagon larger than a regular hexagon inscribed in the outer periphery of the ingot 30 and smaller than a regular hexagon in which the outer periphery of the ingot 30 is inscribed is formed from the ingot 30 to the substrate 31. Is cut out (hereinafter, the shape when cut out in this way is referred to as “pseudo regular hexagon”). Thereby, the useless part of the ingot 30 which is not used as the substrate 31 is suppressed, and the utilization efficiency of the ingot 30 is enhanced.

  Furthermore, in this prior invention, when the solar cell 10 is generated from the substrate 31 cut out in this way, the solar cell 10 is connected to the PP ′ line or the QQ ′ line in FIG. Divided into two or four, and these are arranged as shown in FIGS. 12 (a) and 12 (c). Thereby, the clearance gap part which cannot arrange | position the photovoltaic cell 10 is suppressed, and the filling rate of the photovoltaic cell 10 is raised.

  In addition, in the following Patent Document 2, a regular hexagonal or pseudo regular hexagonal solar battery cell is divided into two by a straight line connecting opposing vertices or a straight line connecting two divided points of opposing sides, and this is divided into solar cells. A configuration arranged in a module is shown. FIG. 13A is a diagram showing a configuration of the solar cell module according to the preceding invention, and FIG. 13B is a cross-sectional view taken along the line R-R ′ in FIG.

In addition, in this prior invention, each photovoltaic cell 10 is arrange | positioned in the photovoltaic module 20 so that polarity may face the same direction. And the electrical connection of each photovoltaic cell 10 is performed by connecting the one surface of the adjacent photovoltaic cell 10 and the other surface of the photovoltaic cell 10 adjacent to this with the interconnector 21.
JP 2001-94127 A JP 09-148601 A

  However, according to the configuration described in Patent Document 2, the oblique sides of the two divided cells are opposed to each other, and the interconnector is routed from the upper surface of the cell to the lower surface at the opposed portion. The gap needs to be made relatively large, and there is a problem that the cell filling rate is lowered accordingly. In addition, if the interconnector is routed from the upper surface to the lower surface in the oblique side portion as described above, the cell tends to be chipped or cracked in the oblique side portion, which may cause a problem that the cell is damaged. Furthermore, when connecting between cells with multiple interconnectors, the bending position is different for each interconnector because the bend is made on the oblique side of the cell, and the interconnector connection work becomes complicated. Problem arises.

  Further, Patent Document 1 does not describe anything about cell wiring by an interconnector.

  Therefore, the present invention can effectively suppress a decrease in cell filling efficiency even when solar cells are divided and arranged as described above, and can prevent damage to the cells due to chipping or cracking. It is an object of the present invention to provide a solar cell module that can simplify connection work of an interconnector.

  In view of the above problems, the present invention has the following features.

  According to a first aspect of the present invention, in the solar cell module, a plurality of quadrangular solar cells that can have a substantially rectangular outline by opposing the hypotenuse are arranged in a planar shape with the hypotenuse facing each other, and the hypotenuse opposes The solar battery cells are connected in parallel by an interconnector.

  According to a second invention, in the solar cell module according to the first invention, the oblique sides of the two solar cells are opposed to each other to form a unit having the substantially rectangular outline, and the unit is substantially rectangular. A plurality of the units are arranged such that the long sides and the short sides of the contour face each other.

  According to a third invention, in the solar cell module according to the first invention, the oblique sides of the two solar cells are opposed to each other to form a block having the substantially rectangular outline, and a plurality of the blocks are further provided. A unit having a substantially rectangular outline that is further elongated than the outline is formed by making the short sides of the substantially rectangular outline face each other, and the long sides and the short sides of the substantially rectangular outline of the unit are opposed to each other. In this way, a plurality of the units are arranged.

  According to a fourth invention, in the solar cell module according to the second or third invention, one upper surface and the other lower surface of the two adjacent units are sequentially connected to each other in accordance with a predetermined electric connection pattern. It is characterized by being connected.

  According to a fifth invention, in the solar cell module according to the fourth invention, in the portion where the short sides of the two adjacent units face each other, the interconnector is connected to the upper surface of one of these two units. From the other unit to the lower surface of the other unit, and the upper surface of the one unit and the lower surface of the other unit are electrically connected to the interconnector.

  According to a sixth invention, in the solar cell module according to any one of the first to fifth inventions, all the solar cells arranged in the solar cell module are of the same type, and these solar cells The cells are arranged in a plane so that the same polarity faces the same direction.

  A seventh invention is for electrically connecting a unit including a plurality of quadrangular solar cells that can have a substantially rectangular outline by opposing the hypotenuses to the solar cells in the solar cell module. And the unit is configured in a rectangular shape by the plurality of solar cells, and the interconnector has at least a portion facing the oblique side from one surface of the solar cell to the other surface. Each solar cell constituting the unit is connected without being routed.

  According to an eighth aspect, in the solar cell module according to the seventh aspect, the plurality of solar cells constituting the unit are electrically connected to each other in parallel.

  In the invention of each aspect described above, the “rectangular shape” of the solar battery cell is, for example, a straight line connecting a pair of opposing vertices of a regular hexagon and a pair of opposing sides of the regular hexagon that are perpendicular to the straight line. In the straight line connecting the midpoints, the shape when the regular hexagon is divided into four, the “pseudo regular hexagon” shown in FIG. 12 or a shape in which part or all of the arc portion remaining in this shape is replaced with a straight line, Alternatively, it includes a shape obtained by dividing a shape with slightly changed sides and corners along the PP ′ line and the QQ ′ line in FIG.

  According to the first and seventh inventions, unlike the configuration shown in FIG. 13, it is not necessary to provide a large gap between the oblique sides of the solar battery cells, thereby suppressing a decrease in the cell filling rate of the solar battery module. Can do. Further, since it is not necessary to route the interconnector from the upper surface side to the lower surface side of the solar cell at the hypotenuse facing portion, it is possible to prevent cell cracking at the hypotenuse portion.

  Further, according to the fifth invention, since the adjacent units are connected by the interconnector at a position where the short sides of the substantially rectangular outline face each other, the interconnector is connected from the upper surface side of one unit to the lower surface side of the other unit. Even if they are routed to each other, the wiring of the interconnector can be performed easily and smoothly, and the workability at the time of inter-unit connection can be improved.

  In addition, according to the sixth aspect of the invention, the solar cells need only be arranged in the module in order according to the electrical connection pattern without considering the type and orientation (polarity) of the solar cells. The workability at the time of module generation can be greatly simplified, so that the yield at the time of solar cell module generation can be improved.

  In addition, the effects and significance of the present invention will become more apparent from the following description of the embodiments.

  The “solar battery cell” according to the present invention corresponds to the divided cell 10a in the following embodiment. The “unit” in the above invention corresponds to the units shown in FIGS. 3 and 10 in the following embodiments. A configuration example of the “unit” in the second invention is illustrated in FIG. 3, and a configuration example of the “unit” in the third invention is illustrated in FIG. In addition, the “unit” in the seventh invention includes the configuration examples of both FIG. 3 and FIG. Furthermore, the “electrical connection pattern” in the fourth aspect of the invention is illustrated in FIGS. 5 to 9 in the following embodiments.

  However, the following embodiment is merely an example of the present invention, and the meaning of the term of the present invention or each constituent element is not limited to that described in the following embodiment. Absent.

  Embodiments of the present invention will be described below with reference to the drawings.

  In FIG. 1, the structure of the photovoltaic cell before dividing into four is shown. As illustrated, the solar battery cell 10 has a planar regular hexagonal shape, and collector electrodes 15 and 19, a front surface side bus bar electrode 151, and a rear surface side bus bar electrode 191 are formed on both front and back surfaces, respectively.

  The cross-sectional structure of the solar battery cell 10 at the dotted line portion in the figure is shown in the upper right of the figure. As illustrated, the solar battery cell 10 includes a substrate 11, an i-type layer 12, a p-type layer 13, a transparent electrode film 14, a surface-side collector electrode 15, an i-type layer 16, and an n-type layer 17. The transparent conductive film 18 and the back side collector electrode 19 are provided.

  The substrate 11 is an n-type single crystal silicon substrate. An i-type layer 12 made of intrinsic amorphous silicon and a p-type layer 13 made of p-type amorphous silicon are sequentially laminated on the surface side of the substrate 11. Further, a transparent conductive film 14 is laminated on the p-type layer 13, and a plurality of surface-side collector electrodes 15 arranged in a line are formed on the transparent conductive film 14, and the surface in a direction crossing the surface-side collector electrode 15. Side bus bar electrode 151 is formed. On the other hand, on the back side of the substrate 11, an i-type layer 16 made of intrinsic amorphous silicon and an n-type layer 17 made of n-type amorphous silicon are sequentially laminated. Further, a transparent conductive film 18 is laminated on the n-type layer 17, and a plurality of back side collector electrodes 19 arranged in a line are formed on the transparent conductive film 18, and the back side in a direction crossing the back side collector electrode 19. A side bus bar electrode 191 is formed. In the configuration example of FIG. 1, the front-side collector electrode 15 and the front-side bus bar electrode 151 are formed separately, but they may be integrally formed as shown in FIG. 2. Similarly, the back side collector electrode 19 and the back side bus bar electrode 191 are also formed separately, but they may be integrally formed as shown in FIG.

In solar cell 10 according to the present embodiment, both light incident from the front surface side and the back surface side is incident on substrate 11. Therefore, a photovoltaic force is generated regardless of whether light is incident from the front or the back. The i-type layers 12 and 16 have a thickness of about 100 mm. The thicknesses of the p-type layer 13 and the n-type layer 17 are also about 100 mm. The transparent electrode films 14 and 18 are made of a translucent material such as ITO, ZnO, or SnO ₂ . The front-side collector electrode 15, the back-side collector electrode 19, the front-side bus bar electrode 151, and the rear-side bus bar electrode 191 are made of a conductive metal material formed by curing, for example, silver paste or the like.

  In addition, although the planar regular hexagonal photovoltaic cell 10 was shown in the figure, it is good also as a pseudo regular hexagonal photovoltaic cell as shown in FIG.12 (b). In addition to the above-described configuration in which a crystalline semiconductor material and an amorphous semiconductor material are combined, a double-sided solar cell using only a crystalline semiconductor material or an amorphous semiconductor material can be used. Furthermore, a single-sided incident type solar cell in which the collector electrode on the back side is formed in a uniform surface instead of the comb shape as shown in the figure can be used.

  The solar cell 10 shown in the figure has a straight line connecting two vertices (AA ′ line in the figure) and a straight line connecting two divided points of two opposing sides (BB ′ line in the figure). Divided into four trapezoidal parts. A cell unit (hereinafter referred to as “unit”) is configured by combining the divided parts so that the upper surface side and the lower surface side face each other in the same direction.

  FIG. 3 shows a configuration example of the unit and a connection form between the units.

  FIG. 4A is a view of the unit as viewed from the upper surface side, and FIG. 4B is a C-C ′ sectional view thereof. Hereinafter, each divided part when the solar battery cell 10 illustrated in FIG. 1 is divided into four is referred to as a “divided cell 10a”.

  At the time of electrical connection of the divided cells 10a, first, the two divided cells 10a to be connected are opposed to each other without substantial deviation so that the upper surface side and the lower surface side face the same direction. Then, two interconnectors 200 are arranged on the front side bus bar electrode 151 on the upper surface of these two divided cells 10a, and the interconnector 200 and the front side bus bar electrode 151 are electrically connected. Thus, one unit is configured in a state where the two divided cells 10a are connected in parallel.

  Then, the interconnector 200 is routed from the upper surface of the two divided cells 10a constituting the unit to the lower surface of the two divided cells 10a constituting the next unit, and the interconnector 200 and the two units constituting the next unit are arranged. The back side bus bar electrode 191 of the divided cell 10a is electrically connected. As a result, the units are connected in series by the interconnector 200. Hereinafter, similarly, the front-side bus bar electrode 151 and the back-side bus bar electrode 191 of the two divided cells 10a are sequentially electrically connected by the two interconnectors 200.

  The interconnector 200 is formed, for example, by dipping solder from which lead is removed on the surface of a copper plate material having a thickness of about 150 μm and a width of about 2 mm. The thickness of the solder layer on the upper and lower surfaces of the copper plate material is about 40 μm. The interconnector 200 is disposed on the front-side bus bar electrode 151 or the back-side bus bar electrode 191, and heat is applied to the portion to melt the solder layer, so that the interconnector 200 has the front-side bus bar electrode 151 or the back-side bus bar electrode 191. Electrically connected to

  In FIG. 4, the example of arrangement | positioning of the unit in the solar cell module and the division | segmentation cell 10a is shown. In addition, a solar cell module seals several division | segmentation cell 10a, 10a, ... connected by the interconnector using a sealing material between a translucent surface protective layer and a back surface protective layer. However, in the following drawings, the surface protective layer, the back surface protective layer, and the sealing material are omitted. The divided cells 10a are electrically connected according to a predetermined electrical connection pattern. The unit configuration method and the divided cell 10a to unit electrical connection method are as described with reference to FIGS. 3 (a) and 3 (b).

  FIG. 5 shows an example of the electrical connection pattern.

  In this pattern example, the units in each row are sequentially connected in series from the center of the solar cell module 20 to the right and left by an interconnector. Here, in the unit group in the odd-numbered rows from the top, that is, the first, third, fifth, seventh, and ninth rows, the unit located at the most central side is electrically connected to the tab 21 in the central portion from the back side. The right end and left end units are electrically connected to the tab 21 on the side from the upper surface side. In the unit group on the even-numbered rows from the top, that is, the second, fourth, sixth, eighth, and tenth rows, the unit located at the most central side is electrically connected to the tab 21 in the central portion from the upper surface side. The right and left end units are electrically connected to the tab 21 on the side from the back side.

  Here, among the tabs 21 located at the center, the uppermost and lowermost tabs 21 are output terminals T1 and T2 of the solar cell module 20. In this pattern example, a bypass diode for preventing reverse voltage application is connected at the position of the arrow in the figure. Here, since the tab 21 is close to the position of the arrow in the figure, the bypass diode can be easily inserted. The bypass diode may be sealed between the front surface protective material and the back surface protective material, or may be mounted in a terminal box attached to the back side of the back surface protective material.

  FIG. 6 shows another example of the electrical connection pattern.

  In this pattern example, the units of each row are sequentially connected in series from the left end of the solar cell module 20 to the right. Here, in the unit group on the odd-numbered rows from the top, that is, the first, third, fifth, seventh, and ninth rows, the left end unit is electrically connected to the tab 21 on the left side from the back side, and the right end unit. Are electrically connected to the tab 21 on the right side from the upper surface side. In the unit group in the even-numbered rows from the top, that is, the second, fourth, sixth, eighth, and tenth rows, the left end unit is electrically connected to the tab 21 on the left side from the upper surface side, and the right end unit is From the back side, it is electrically connected to the tab 21 on the right side. Therefore, in this pattern example, the units from the upper left to the lower left of the figure are sequentially connected in series.

  Here, among the tabs 21 on the left side, the uppermost tab 21 and the lowermost tab 21 are output terminals T <b> 1 and T <b> 2 of the solar cell module 20. In this pattern example, a bypass diode for preventing reverse voltage application is connected at the position of the arrow in the figure. Here, since the tab 21 is approaching the position of the arrow in the figure as in the case of FIG. The bypass diode may be sealed between the front surface protective material and the back surface protective material, or may be mounted in a terminal box attached to the back side of the back surface protective material.

  FIG. 7 shows still another example of the electrical connection pattern.

  In this pattern example, the units in each row are sequentially connected in series from the right end of the solar cell module 20 to the left. Here, in the unit group in the first, second, third and fourth rows from the top, the right end unit is electrically connected to the tab 21 on the right side from the back side, and the left end unit is connected to the left side from the upper side. It is electrically connected to the tab 21 of the part. In the unit group on the fifth, sixth, seventh, and eighth rows from the top, the right end unit is electrically connected to the tab 21 on the right side from the top side, and the left end unit is connected to the left side from the back side. The tab 21 is electrically connected. Therefore, in this pattern example, a 4-parallel type solar cell module is configured in which the unit groups in the first, second, third and fourth rows and the unit groups in the fifth, sixth, seventh and eighth rows are connected in parallel.

  Here, the two tabs 21 of the tab 21 on the right side are the output terminals T <b> 1 and T <b> 2 of the solar cell module 20. In this pattern example, a bypass diode for preventing reverse voltage application is connected at the position of the arrow in the figure. Here, since the tab 21 is close to the position of the arrow in the figure as in the case of FIGS. 5 and 6, the bypass diode can be easily inserted. Further, since only one bypass diode needs to be inserted, the configuration can be simplified. The bypass diode may be sealed between the front surface protective material and the back surface protective material, or may be mounted in a terminal box attached to the back side of the back surface protective material.

  FIG. 8 shows still another example of the electrical connection pattern.

  In this pattern example, the units of each row are sequentially connected in series from the left end of the solar cell module 20 to the right. Here, in the unit group in the first, second, fifth, and sixth rows from the top, the left end unit is electrically connected to the tab 21 on the left side from the back side, and the right end unit is on the right side from the top side. It is electrically connected to the tab 21 of the part. In the unit group in the third, fourth, seventh, and eighth rows from the top, the left end unit is electrically connected to the tab 21 on the left side from the upper surface side, and the right end unit is connected to the right side portion from the back side. The tab 21 is electrically connected. Therefore, in this pattern example, the unit groups in the first and second rows, the unit groups in the third and fourth rows, the unit groups in the fifth and sixth rows, and the unit groups in the seventh and eighth rows are connected in parallel. A two-parallel solar cell module is configured.

  Here, among the three tabs 21 on the left side, the upper and lower tabs 21 are output terminals T <b> 1 and T <b> 2 of the solar cell module 20. In this pattern example, a bypass diode for preventing reverse voltage application is connected at the position of the arrow in the figure. Here, since the tab 21 is close to the position of the arrow in the figure as in the case of FIGS. 5, 6, and 7, the bypass diode can be easily inserted. Further, since only two bypass diodes need be inserted, the configuration can be simplified. The bypass diode may be sealed between the front surface protective material and the back surface protective material, or may be mounted in a terminal box attached to the back side of the back surface protective material.

  FIG. 9 shows still another example of the electrical connection pattern. In each pattern example, the divided cells 10a are combined and arranged in the horizontal direction in each figure to form one unit. However, in this pattern example, the divided cells 10a are arranged in the vertical direction in the figure. One unit is configured by arranging them in combination.

  In this example pattern, the units in each column are sequentially connected in series from the upper end of the solar cell module 20 downward. Here, in the unit group in the first, second, fifth, sixth, ninth, tenth, thirteenth, fourteenth, seventeenth and eighteenth columns from the left, the upper end unit is electrically connected to the upper tab 21 from the back side. Further, the lower end unit is electrically connected to the lower tab 21 from the upper surface side. Further, in the unit groups in the third, fourth, seventh, eighth, eleventh, twelfth, fifteenth, sixteenth and nineteenth columns from the left, the upper end unit is electrically connected to the upper tab 21 from the upper surface side, and the lower end Are electrically connected from the back side to the tab 21 on the lower side. Therefore, in this pattern example, the first and second row unit groups, the third and fourth row unit groups, the fifth and sixth row unit groups, the seventh and eighth row unit groups, The unit group in the column, the unit group in the 11th and 12th columns, the unit group in the 13th and 14th columns, the unit group in the 15th and 16th columns, the unit group in the 17th and 18th columns, and the 19th column A solar cell module in which the unit groups are connected in parallel is configured.

  Here, among the three tabs 21 on the upper side, the left end and right end tabs 21 are output terminals T <b> 1 and T <b> 2 of the solar cell module 20. In this pattern example, a bypass diode for preventing reverse voltage application is connected at the position of the arrow in the figure. Here, since the tab 21 is close to the position of the arrow in the figure as in the case of FIGS. 5, 6, 7, and 8, the bypass diode can be easily inserted. The bypass diode may be sealed between the front surface protective material and the back surface protective material, or may be mounted in a terminal box attached to the back side of the back surface protective material.

  As described above, according to the present embodiment, the following effects can be obtained.

  (1) Since the interconnector 200 is not routed from the upper surface to the back surface or from the back surface to the upper surface in the hypotenuse facing portion of the divided cell 10a, there is no need to leave a large gap in the hypotenuse facing portion. Reduction can be effectively suppressed.

  (2) Further, since the interconnector 200 is not routed from the upper surface to the back surface or from the back surface to the upper surface in the hypotenuse facing portion of the divided cell 10a, there is no possibility that the split cell 10a is not chipped or cracked in the hypotenuse portion. .

  (3) Further, as shown in FIGS. 3A and 3B, the electrical connection between the units is performed by connecting the interconnector 200 from the upper surface of the unit at a portion where two sides perpendicular to the extending direction of the interconnector 200 face each other. Since it is performed by drawing it to the back surface, it is only necessary to bend the two interconnectors 200 at substantially the same position in the extending direction during inter-unit connection, thereby improving workability during inter-unit connection by the interconnector 200. it can. Therefore, the yield at the time of solar cell module production can be improved.

  (4) Further, in the pattern examples of FIGS. 5 to 9, all the divided cells 10 a arranged in the solar cell module 10 have the surface (+ plane) facing the same direction, and thus one type of divided cell 10 a is used. Thus, the solar cell module 10 can be configured. In this case, it is only necessary to arrange the divided cells 10a in the module in order according to the electrical connection pattern without considering the type and orientation of the divided cells 10a, so that the workability when generating the solar cell module 10 is greatly simplified. Therefore, the yield at the time of solar cell module generation can be improved.

  (5) Furthermore, as shown in FIG. 3, when two divided cells 10a are connected in parallel to form one unit, when two divided cells 10a are connected in series to form one unit, In comparison, the voltage increase in units can be suppressed to about ½. Therefore, as shown in FIGS. 5 to 9, the frequency of insertion of the bypass diode can be suppressed, and thus the configuration of the solar cell module and the workability can be simplified.

  (6) In addition, according to the connection patterns of FIGS. 5 to 9, the insertion position of the bypass diode can be approached, so that the bypass diode can be easily inserted. In particular, according to the connection patterns of FIGS. 7 and 8, the number of bypass diodes to be inserted can be suppressed.

  In addition, this invention is not limited to the said embodiment, Moreover, various changes are possible for embodiment of this invention besides showing above.

  For example, in the above embodiment, two divided cells 10a are combined to form one unit. For example, as shown in FIGS. 10A and 10B, four divided cells 10a are combined. One unit may be configured, and a unit may be configured by combining other number of divided cells 10a.

  Moreover, in the said embodiment, although the tab 21 was arrange | positioned outside the arrangement | positioning area | region of a division cell, various forms can be taken suitably, such as arranging the tab 21 on the back side of a division cell.

  Furthermore, the number of units arranged in the solar cell module is not limited to that shown in FIGS. 5 to 9 and can be changed as appropriate. However, in the case of FIG. 6, for example, the output terminals T1 and T2 can be drawn out from the same side if the number of unit arrangement rows is made even, but if the number is made odd, the output terminal T1 is taken from the diagonal position of the opposite sides. , T2 is pulled out, and it is difficult to arrange the terminal box. Therefore, the number of units arranged may be set to an appropriate number in consideration of such points.

  Moreover, this invention is applicable not only to the solar cell module which sunlight injects from one side but to the solar cell module which can inject sunlight from both surfaces.

  In addition, the embodiment of the present invention can be variously modified as appropriate within the scope of the technical idea shown in the claims.

The figure which shows the structure of the photovoltaic cell which concerns on embodiment The figure which shows the cross-section of the photovoltaic cell which concerns on embodiment The figure which shows the connection form between the division cells which concern on embodiment, and between units The figure which shows the unit arrangement example which concerns on embodiment The figure which shows an example of the unit connection pattern which concerns on embodiment The figure which shows an example of the unit connection pattern which concerns on embodiment The figure which shows an example of the unit connection pattern which concerns on embodiment The figure which shows an example of the unit connection pattern which concerns on embodiment The figure which shows an example of the unit connection pattern which concerns on embodiment The figure which shows the example of a change of the connection form between the division cells which concern on embodiment, and between units A diagram for explaining a conventional example A diagram for explaining a conventional example A diagram for explaining a conventional example

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Solar cell 10a Divided cell 20 Solar cell module 200 Interconnector

Claims (8)

A plurality of quadrangular solar cells that can have a substantially rectangular outline by facing the hypotenuses are arranged in a planar shape with the hypotenuses opposed, and the solar cells facing the hypotenuses are interconnected by an interconnector. Connected in parallel,
A solar cell module characterized by that. In claim 1,
A unit having the substantially rectangular outline is configured by making the oblique sides of the two solar cells face each other, and a plurality of such long sides and short sides of the substantially rectangular outline of the unit are opposed to each other. Arranged the unit,
A solar cell module characterized by that. In claim 1,
The oblique sides of the two solar cells are opposed to each other to form a block having the substantially rectangular outline, and a plurality of the blocks are further made to face each other with the short sides of the substantially rectangular outline being further opposed to the outline. A unit having an elongated, substantially rectangular outline is configured, and a plurality of the units are arranged such that long sides and short sides of the substantially rectangular outline of the unit face each other.
A solar cell module characterized by that. In claim 2 or 3,
The upper surface of one of the two units adjacent to each other and the lower surface of the other are sequentially electrically connected according to a predetermined electrical connection pattern.
A solar cell module characterized by that. In claim 4,
In the portion where the short sides of the two adjacent units face each other, the interconnector is routed from the upper surface of one of the two units to the lower surface of the other unit, and the upper surface of the one unit and the other The lower surface of the unit was electrically connected to the interconnector,
A solar cell module characterized by that. In any one of Claims 1 thru | or 5,
All the solar cells arranged in the solar cell module are of the same type, and these solar cells are arranged in a plane so that the same polarity faces the same direction,
A solar cell module characterized by that. A unit including a plurality of quadrangular solar cells that can have a substantially rectangular outline by opposing the hypotenuse;
An interconnector for electrically connecting solar cells in the unit;
The unit is configured in a square shape by the plurality of solar cells,
The interconnector connects each solar cell constituting the unit without being routed from one surface of the solar cell to the other surface at least in a portion where the hypotenuse faces.
A solar cell module characterized by that. In Claim 7, The plurality of solar cells constituting the unit are electrically connected to each other in parallel.
A solar cell module characterized by that.

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