JP2016171299A - Solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module that can suppress occurrence of leak current even when a light reflection member having a conductive light reflection membrane is disposed.SOLUTION: A solar battery module comprises a solar battery cell 10, a light reflection member 30 at least a part of which is located on the side of the solar battery cell 10. The light reflection member 30 includes an insulating member 31, and a conductive light transmission membrane 32 formed on the surface of the insulating member 31. The thickness dof the light reflection member 30 is larger than the thickness dof the solar battery cell 10, and the surface at the solar battery cell 10 side of the conductive light reflection membrane 32 is located outward from the surface of the solar battery cell 10.SELECTED DRAWING: Figure 2B

Description

  The present invention relates to a solar cell module.

  2. Description of the Related Art Conventionally, solar cell modules have been developed as photoelectric conversion devices that convert light energy into electrical energy. The solar cell module is expected as a new energy source because it can convert inexhaustible sunlight directly into electricity, and it has a smaller environmental load and is cleaner than power generation using fossil fuels.

  The solar cell module has, for example, a structure in which a plurality of solar cells are sealed with a filling member between a surface protection member and a back surface protection member. In the solar cell module, the plurality of solar cells are arranged in a matrix.

  Conventionally, in order to effectively use sunlight irradiated to the gap between the solar cells, a light reflecting member that protrudes from the light receiving surface of the solar cell and is inclined to the light receiving surface is provided in the gap between the solar cells. A proposed solar cell module has been proposed (for example, Patent Document 1).

JP2013-98496A

  When the light reflecting member has a conductive light reflecting film such as a metal film, if the light reflecting member is disposed in the gap between the solar cells, a leakage current is generated between the solar cells through the conductive light reflecting film. There is.

  The present invention has been made to solve such a problem, and a solar battery that can suppress the occurrence of leakage current even if a light reflecting member having a conductive light reflecting film is disposed between solar cells. The purpose is to provide modules.

  In order to achieve the above object, one aspect of a solar cell module according to the present invention includes a first solar cell and a light reflecting member at least a part of which is located on a side of the first solar cell. The light reflecting member includes an insulating member and a conductive light reflecting film formed on a surface of the insulating member, and the thickness of the light reflecting member is greater than the thickness of the first solar cell. Further, the surface of the conductive light reflecting film on the first solar cell side is located outward from the surface of the first solar cell.

  Even if the light reflecting member having the conductive light reflecting film is arranged between the solar cells, it is possible to suppress the occurrence of leakage current.

4 is a plan view of the solar cell module according to Embodiment 1. FIG. It is sectional drawing of the solar cell module which concerns on Embodiment 1 in the IB-IB line | wire of FIG. 1A. 4 is a partially enlarged plan view of the solar cell module according to Embodiment 1. FIG. It is sectional drawing (enlarged sectional drawing of a light reflection member periphery) of the solar cell module which concerns on Embodiment 1 in the IIB-IIB line | wire of FIG. 2A. It is a partially expanded sectional view of the solar cell module of a comparative example. 5 is a partially enlarged cross-sectional view of a solar cell module according to a modification of Embodiment 1. FIG. 6 is an enlarged cross-sectional view around a light reflecting member of a solar cell module according to Embodiment 2. FIG. 6 is an enlarged cross-sectional view around a light reflecting member of a solar cell module according to Embodiment 2. FIG. 6 is a partially enlarged cross-sectional view of a solar cell module according to a modification of Embodiment 2. FIG. 6 is an enlarged cross-sectional view around a light reflecting member of a solar cell module according to Embodiment 3. FIG. 6 is a partially enlarged cross-sectional view of a solar cell module according to a modification of Embodiment 3. FIG. 6 is an enlarged cross-sectional view around a light reflecting member of a solar cell module according to Embodiment 4. FIG. FIG. 10 is an enlarged cross-sectional view around a light reflecting member of a solar cell module according to Modification 1 of Embodiment 4. FIG. 10 is an enlarged cross-sectional view around the light reflecting member of the solar cell module according to Embodiment 4 shown in FIG. 9. FIG. 11 is an enlarged cross-sectional view around a light reflecting member in a solar cell module according to Modification 1 of Embodiment 4 shown in FIG. 10. It is a partially expanded sectional view of the other aspect of the solar cell module which concerns on the modification 1 of Embodiment 4 shown in FIG. It is a partially expanded rear view of the other aspect of the solar cell module according to Modification 1 of Embodiment 4 shown in FIG. 6 is a partially enlarged cross-sectional view of a solar cell module according to Modification 2 of Embodiment 3. FIG. 6 is a partially enlarged cross-sectional view of a solar cell module according to Modification 3 of Embodiment 3. FIG. 10 is a partially enlarged cross-sectional view of a solar cell module according to Modification 1. FIG. 10 is a partially enlarged plan view of a solar cell module according to Modification 2. FIG. 10 is a partially enlarged plan view of a solar cell module according to Modification 3. FIG. 10 is a partially enlarged cross-sectional view of a solar cell module according to Modification 4. FIG.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a preferred specific example of the present invention. Accordingly, numerical values, shapes, materials, components, arrangement positions and connection forms of components, and steps and order of steps shown in the following embodiments are merely examples and are not intended to limit the present invention. . Therefore, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims showing the highest concept of the present invention are described as optional constituent elements.

  Each figure is a schematic diagram and is not necessarily illustrated strictly. Moreover, in each figure, the same code | symbol is attached | subjected to the substantially same structure, The overlapping description is abbreviate | omitted or simplified.

(Embodiment 1)
[Configuration of solar cell module]
First, a schematic configuration of solar cell module 1 according to Embodiment 1 will be described with reference to FIGS. 1A and 1B. 1A is a plan view of the solar cell module according to Embodiment 1. FIG. 1B is a cross-sectional view of the solar cell module according to Embodiment 1 taken along line IB-IB in FIG. 1A.

  1A and 1B, the Z axis is an axis perpendicular to the main surface of the solar cell module 1, and the X axis and the Y axis are orthogonal to each other, and both are orthogonal to the Z axis. . The same applies to the Z-axis, X-axis, and Y-axis in the following drawings.

  As shown in FIGS. 1A and 1B, the solar cell module 1 includes a plurality of solar cells 10, a tab wiring 20, a light reflection member 30, a surface protection member 40, a back surface protection member 50, and a filling member 60. And a frame 70. The solar cell module 1 has a structure in which a plurality of solar cells 10 are sealed with a filling member 60 between a surface protection member 40 and a back surface protection member 50.

  As shown in FIG. 1A, the planar view shape of the solar cell module 1 is, for example, a substantially rectangular shape. As an example, the solar cell module 1 has a substantially rectangular shape with a horizontal length of about 1600 mm and a vertical length of about 800 mm. The shape of the solar cell module 1 is not limited to a rectangular shape.

  Hereinafter, each component of the solar cell module 1 will be described in more detail with reference to FIG. 2A and FIG. 2B with reference to FIG. 1A and FIG. 1B. 2A is an enlarged view of a region X surrounded by a broken line in FIG. 1A and is a partially enlarged plan view of the solar cell module according to Embodiment 1. FIG. 2B is a cross-sectional view of the solar cell module according to Embodiment 1 taken along the line IIB-IIB in FIG. 2A. 2B is an enlarged cross-sectional view around the light reflecting member 30. FIG.

[Solar cell (solar cell)]
The solar cell 10 is a photoelectric conversion element (photovoltaic element) that converts light such as sunlight into electric power. As shown in FIG. 1A, a plurality of solar cells 10 are arranged in a matrix (matrix) on the same plane.

  The plurality of solar cells 10 arranged in a straight line along one of the row direction and the column direction are formed by connecting two adjacent solar cells 10 by tab wirings 20 to form a string (cell string). Yes. The plurality of solar cells 10 are stringed by being electrically connected by the tab wiring 20. The plurality of solar cells 10 in one string 10 </ b> S are connected in series by tab wiring 20.

  As shown in FIG. 1A, in the present embodiment, twelve solar cells 10 arranged at equal intervals along the row direction (X-axis direction) are connected by tab wirings 20 to form one string 10S. Is configured. More specifically, each string 10S is configured by sequentially connecting two solar cells 10 adjacent to each other in the row direction (X-axis direction) with three tab wirings 20 in the row direction. All the photovoltaic cells 10 for one row arranged along are connected.

  A plurality of strings 10S are formed. The plurality of strings 10S (strings) are arranged along the other in the row direction or the column direction. In the present embodiment, six strings 10S are formed. As shown in FIG. 1A, the six strings 10S are arranged at equal intervals along the column direction (Y-axis direction) so as to be parallel to each other.

  The leading solar cell 10 in each string 10 </ b> S is connected to a crossover wiring (not shown) via a tab wiring 20. Further, the last solar cell 10 in each string 10 </ b> S is connected to a crossover wiring (not shown) via a tab wiring 20. Thereby, a plurality of (six in FIG. 1A) strings 10S are connected in series or in parallel to form a cell array. In the present embodiment, two adjacent strings 10S are connected in series to form one series connection body (24 solar cells 10 connected in series), and three series connection bodies are provided. Connected in parallel.

  As shown in FIG. 1A and FIG. 2A, the plurality of solar cells 10 are arranged with gaps between the solar cells 10 adjacent in the row direction and the column direction. As will be described later, a light reflecting member 30 is disposed in the gap.

  In this Embodiment, the photovoltaic cell 10 is substantially rectangular shape in planar view. Specifically, the solar battery cell 10 has a shape lacking a 125 mm square square. That is, one string 10 </ b> S is configured such that one side of two adjacent solar battery cells 10 faces each other. In addition, the shape of the photovoltaic cell 10 is not restricted to a substantially rectangular shape.

  The solar cell 10 has a semiconductor pin junction as a basic structure. As an example, an n-type single crystal silicon substrate which is an n-type semiconductor substrate and one main surface side (front surface side) of the n-type single crystal silicon substrate. The i-type amorphous silicon layer, the n-type amorphous silicon layer, the n-side surface electrode, and the other main surface side (back side) of the n-type single crystal silicon substrate, which are sequentially formed, are sequentially formed. A p-type amorphous silicon layer, a p-type amorphous silicon layer, and a p-side surface electrode. The n-side surface electrode and the p-side surface electrode are transparent electrodes such as ITO (Indium Tin Oxide). In addition, since the solar cell module 1 in this Embodiment is a single-sided light-receiving system, the p side surface electrode does not need to be transparent, For example, the metal electrode which has reflectivity may be sufficient.

  As shown in FIGS. 1B and 2B, the solar battery cell 10 includes a front-side collector electrode 11 (n-side collector electrode) electrically connected to the n-side surface electrode of the solar battery cell 10, and the solar battery cell 10. A back side collector electrode 12 (p side collector electrode) electrically connected to the p side surface electrode is formed.

  Each of the front-side collector electrode 11 and the back-side collector electrode 12 includes, for example, a plurality of finger electrodes that are linearly formed so as to be orthogonal to the extending direction of the tab wiring 20, and finger fingers that are connected to these finger electrodes. A plurality of bus bar electrodes formed in a straight line along a direction perpendicular to the electrodes (extending direction of the tab wiring 20). For example, the number of bus bar electrodes is the same as that of the tab wiring 20, and is three in the present embodiment. In addition, although the front side collector electrode 11 and the back side collector electrode 12 are mutually the same shape, it is not limited to this.

  The front side collecting electrode 11 and the back side collecting electrode 12 are made of a low resistance conductive material such as silver (Ag). For example, the front-side collector electrode 11 and the back-side collector electrode 12 have a predetermined pattern formed on a n-side surface electrode and a p-side surface electrode with a conductive paste (silver paste or the like) in which a conductive filler such as silver is dispersed in a binder resin. It can be formed by screen printing.

  In the solar battery 10 configured as described above, both the front surface (n side surface) and the back surface (p side surface) are light receiving surfaces. When light enters the solar battery cell 10, carriers are generated in the photoelectric conversion part of the solar battery cell 10. The generated carriers diffuse to the n-side surface electrode and the p-side surface electrode as photocurrents, are collected by the front-side collector electrode 11 and the back-side collector electrode 12 and flow into the tab wiring 20. Thus, by providing the front side collector electrode 11 and the back side collector electrode 12, the carrier generated in the solar battery cell 10 can be efficiently taken out to the external circuit.

[Tab wiring]
As shown in FIGS. 1A and 1B, the tab wiring 20 (interconnector) electrically connects two adjacent solar cells 10 in the string 10S. As shown in FIGS. 1A and 2A, in the present embodiment, two adjacent solar cells 10 are connected by three tab wirings 20 arranged substantially parallel to each other. Each tab wiring 20 is extended along the alignment direction of the two photovoltaic cells 10 to be connected.

  The tab wiring 20 is a long conductive wiring, for example, a ribbon-shaped metal foil. The tab wiring 20 can be produced, for example, by cutting a metal foil such as a copper foil or a silver foil, which is covered with solder, silver, or the like into a strip having a predetermined length.

  As shown in FIG. 1B, for each tab wiring 20, one end portion of the tab wiring 20 is arranged on the surface of one of the two adjacent solar battery cells 10, and the other of the tab wiring 20. The end portion is disposed on the back surface of the other solar battery cell 10 of the two adjacent solar battery cells 10.

  Each tab wiring 20 includes two adjacent solar cells 10, an n-side collector electrode (front-side collector electrode) of one solar cell 10 and a p-side collector electrode (rear surface side) of the other solar cell 10. Are electrically connected to each other. Specifically, the tab wiring 20 is joined to the bus bar electrode of the front side collector electrode 11 of one solar cell 10 and the bus bar electrode of the back side collector electrode 12 of the other solar cell 10. The tab wiring 20 and the front side collector electrode 11 (back side collector electrode 12) are bonded together by, for example, thermocompression bonding with a conductive adhesive interposed therebetween.

  The tab wiring 20 and the front side collector electrode 11 (the back side collector electrode 12) may be joined by a solder material instead of the conductive adhesive.

  The surface of the tab wiring 20 may be provided with unevenness. By providing unevenness on the surface of the tab wiring 20, when light incident on the solar cell module 1 enters the surface of the tab wiring 20, the light is scattered by the unevenness to cause an interface between the surface protection member 40 and the air layer. Alternatively, the light can be guided to the solar battery cell 10 by being reflected at the interface between the surface protection member 40 and the filling member 60. Thereby, the light reflected by the surface of the tab wiring 20 can also contribute to power generation effectively, and the power generation efficiency of the solar cell module 1 is improved.

  As such tab wiring 20, what formed the silver vapor deposition film on the surface of the copper foil which has an unevenness | corrugation as a surface shape can be used. The surface of the tab wiring 20 may be a flat surface instead of the uneven shape. Further, a light reflecting member having an uneven surface may be separately laminated on the tab wiring having a flat surface.

[Light reflecting member]
As shown in FIG. 1A, FIG. 2A, and FIG. 2B, the solar cell 10 is provided with a light reflecting member 30. At least a part of the light reflecting member 30 is located on the side of the solar battery cell 10. As shown in FIG. 2B, in the present embodiment, the light reflecting member 30 includes two adjacent solar cells 10 (a first solar cell 10A and a second solar cell 10B) arranged with a gap therebetween. ).

  Moreover, as shown to FIG. 1A, the light reflection member 30 is provided with two or more along the longitudinal direction of the string 10S in the clearance gap between the two adjacent strings 10S. Specifically, the light reflecting member 30 is provided for each gap between the two solar cells 10 in the gap between the strings 10S.

  As shown in FIG. 2A, each light reflecting member 30 is a tape-like light reflecting sheet extending in the longitudinal direction of the string 10S, and as an example, has a long rectangular shape and a thin plate shape. For example, the light reflecting member 30 has a length of 100 mm to 130 mm and a width of 1 mm to 20 mm.

  Each light reflecting member 30 covers a gap between two adjacent solar cells 10. That is, the width of the light reflecting member 30 is the same as the gap between the two adjacent solar battery cells 10. In addition, the width | variety of the light reflection member 30 is not restricted to this, For example, you may be smaller than the space | interval of the clearance gap between the two adjacent photovoltaic cells 10. FIG.

  The light incident on the light reflecting member 30 is reflected. The light reflecting member 30 in the present embodiment functions as a light diffusing and reflecting member because it diffuses and reflects incident light. That is, the light reflecting member 30 is a light diffuse reflection sheet.

  As shown in FIG. 2B, the light reflecting member 30 includes an insulating member 31 made of an insulating material and a conductive light reflecting film 32 formed on the surface of the insulating member 31. That is, the light reflecting member 30 has a laminated structure of the insulating member 31 and the conductive light reflecting film 32.

  The insulating member 31 is made of an insulating resin material such as polyethylene terephthalate (PET) or acrylic. Further, the conductive light reflecting film 32 is a metal reflecting film made of a metal such as aluminum or silver. In the present embodiment, the conductive light reflecting film 32 is an aluminum vapor deposition film.

  In addition, irregularities 30 a are formed on the surface of the insulating member 31. The conductive light reflecting film 32 made of a metal film is formed on the surface of the unevenness 30a by, for example, vapor deposition. Therefore, the surface shape of the conductive light reflecting film 32 becomes an uneven shape following the uneven shape of the unevenness 30a. Due to the uneven shape of the conductive light reflecting film 32, the light incident on the light reflecting member 30 can be diffusely reflected in a predetermined direction.

  As for the unevenness | corrugation 30a, the height between a recessed part (valley part) and a convex part (peak part) is 5 micrometers or more and 100 micrometers or less, and the space | interval (pitch) of an adjacent convex part is 20 micrometers or more and 400 micrometers or less. In this Embodiment, the height between a recessed part and a convex part is 12 micrometers, and the space | interval (pitch) of an adjacent convex part is 40 micrometers.

  In the present embodiment, the light reflecting member 30 is disposed so that the surface of the conductive light reflecting film 32 faces the surface protection member 40. That is, the light reflecting member 30 is such that the insulating member 31 is located on the back surface protection member 50 side, and the surface (back surface) of the conductive light reflecting film 32 on the solar cell 10 side is located on the surface protection member 40 side. Is arranged. In the present embodiment, since the conductive light reflecting film 32 is provided on the surface protection member 40 side, the insulating member 31 is made of a translucent material such as a transparent material, and a non-white material such as a white material or a black material. Any of translucent materials may be sufficient.

  Thus, by providing the light reflecting member 30 in the gap between two adjacent solar cells 10, when the light incident on the solar cell module 1 enters the surface of the light reflecting member 30, the conductive light The light is diffusely reflected (scattered) by the uneven shape of the reflective film 32. The diffusely reflected light is reflected at the interface between the surface protection member 40 and the air layer or the interface between the surface protection member 40 and the filling member 60 and guided to the solar battery cell 10. As a result, two adjacent solar cells that are ineffective regions (regions in the gap between the two adjacent strings 10S in this embodiment, where the incident light cannot contribute to power generation). Since the light incident on the region between the gaps 10 can also contribute to power generation effectively, the power generation efficiency of the solar cell module 1 is improved.

  In particular, in the present embodiment, the light reflecting member 30 is provided not in the back surface protection member 50 or the like but in the power generation invalid region at the end of the solar battery cell 10. Thereby, productivity can be improved and the power generation capacity of the solar battery cell 10 can be used efficiently.

Further, as shown in FIG. 2B, the thickness _{d M} of the light reflecting member 30 is thicker than the thickness _{d C} of the solar cell _{10 (d M> d C)} . In the present embodiment, the thickness d _M of the light reflecting member 30 is the total thickness including the thickness of the insulating member 31 and the thickness of the conductive light reflecting film 32.

Furthermore, the conductive light reflecting film 32 of the light reflecting member 30 is located outward from the surface of the solar battery cell 10. Specifically, the light reflecting member 30 is configured such that the conductive light reflecting film 32 is positioned outward from the front-side collector electrode 11 in a direction away from the solar battery cell 10. Accordingly, the height of the unevenness of the conductive light-reflecting film 32 when the _{d X,} has become _{d M} -d X> d _C.

In the present embodiment, the thickness d _C of the solar battery cell 10 is about 200 μm. Further, the height of the unevenness of the conductive light reflecting film 32 is not less than 5 μm and not more than 100 μm. In this case, the value (d _M −d _X ) obtained by subtracting the height of the unevenness of the conductive light reflecting film 32 from the thickness of the light reflecting member 30 may be 200 μm or more, and is, for example, 250 μm to 500 μm.

The thickness d _M of the light reflecting member 30 is preferably 55 μm or more thicker than the value obtained by adding the thickness d _C of the solar battery cell 10 and the uneven height d _{X of the} conductive light reflecting film 32.

  Further, as shown in FIG. 2B, the distance d1 between the first solar cell 10A and the conductive light reflecting film 32 and the distance d2 between the second solar cell 10B and the conductive light reflecting film 32 are set. The added distance (d1 + d2), which is the added value, is preferably 110 μm or more.

  The light reflecting member 30 configured as described above is sealed by the filling member 60. That is, the light reflecting member 30 is bonded and fixed by the filling member 60.

  In the present embodiment, the shape of the irregularities 30a in the light reflecting member 30 is a triangular groove shape along the longitudinal direction of the light reflecting member 30, but is not limited thereto, and light is scattered. The shape may be a conical shape, a quadrangular pyramid shape, a polygonal pyramid shape, or a combination of these shapes.

[Surface protection member, back surface protection member]
The surface protection member 40 (first protection member) is a member that protects the surface on the front side of the solar cell module 1, and the inside of the solar cell module 1 (solar cell 10 or the like) is exposed to an external environment such as wind and rain or an external impact. Protect from. As shown in FIG. 1B, the surface protection member 40 is disposed on the surface side (n side) of the solar battery cell 10 and protects the light receiving surface on the front side of the solar battery cell 10.

  The surface protection member 40 is configured by a translucent member that transmits light in a wavelength band used for photoelectric conversion in the solar battery cell 10. The surface protection member 40 is, for example, a glass substrate (transparent glass substrate) made of a transparent glass material, or a resin substrate made of a hard resin material having a film-like or plate-like translucency and water shielding property.

  On the other hand, the back surface protection member 50 (second protection member) is a member that protects the back surface of the solar cell module 1 and protects the inside of the solar cell module 1 from the external environment. As shown in FIG. 1B, the back surface protection member 50 is disposed on the back surface side (p side) of the solar battery cell 10.

  The back surface protection member 50 is a film-like or plate-like resin sheet made of a resin material such as polyethylene terephthalate (PET) or polyethylene naphthalate (PEN).

  Since the solar cell module 1 in the present embodiment is a single-sided light receiving method, the back surface protection member 50 may be an opaque plate or film. In this case, as the back surface protection member 50, for example, an opaque member (light-shielding member) such as a black member or a laminated film such as a resin film having a metal foil such as an aluminum foil therein may be used. Note that the back surface protection member 50 is not limited to the light-impermeable member, and may be a light-transmissive member such as a glass sheet or a glass substrate made of a glass material.

  A filling member 60 is filled between the front surface protection member 40 and the back surface protection member 50. The front surface protection member 40 and the back surface protection member 50 and the solar battery cell 10 are bonded and fixed by the filling member 60.

[Filling member]
The filling member (filler) 60 is disposed between the front surface protection member 40 and the back surface protection member 50. In the present embodiment, the filling member 60 is filled so as to fill a space between the surface protection member 40 and the back surface protection member 50.

  As shown in FIG. 2B, the filling member 60 includes a front surface side filling member 61 and a back surface side filling member 62. The plurality of solar cells 10 are entirely covered with the filling member 60 by performing a laminating process (lamination process) while being sandwiched between, for example, a sheet-like front surface side filling member 61 and a back surface side filling member 62.

  Specifically, after the plurality of solar cells 10 are connected by the tab wiring 20 to form the string 10S, the plurality of strings 10S are sandwiched between the front surface side filling member 61 and the back surface side filling member 62, The front surface protection member 40 and the back surface protection member 50 are disposed above and below, and thermocompression bonding is performed in a vacuum at a temperature of, for example, 100 ° C. or higher. By this thermocompression bonding, the front surface side filling member 61 and the back surface side filling member 62 are heated and melted to form a filling member 60 that seals the solar battery cell 10.

  The front side filling member 61 is a resin sheet made of a resin material such as ethylene vinyl acetate (EVA), for example, and is disposed between the plurality of solar cells 10 and the surface protection member 40. The front surface side filling member is mainly filled by laminating so as to fill a gap between the solar battery cell 10 and the surface protection member 40. For example, the surface side filling member 61 is a transparent resin sheet. As an example, the surface-side filling member 61 is a transparent resin sheet made of a hot-melt adhesive made of EVA.

  The back surface side filling member 62 is a resin sheet made of a resin material such as ethylene vinyl acetate (EVA), for example, and is disposed between the plurality of solar cells 10 and the back surface protection member 50. The back surface side filling member 62 is mainly filled by a laminating process so as to fill a gap between the solar battery cell 10 and the back surface protection member 50. In addition, since the solar cell module 1 in this Embodiment is a single-sided light reception system, although the black or white resin sheet is used as the back surface side filling member 62, it is not restricted to this. As an example, the back surface side filling member 62 is a white resin sheet made of a hot melt adhesive made of EVA.

[flame]
The frame 70 is an outer frame that covers the peripheral edge of the solar cell module 1. The frame 70 is, for example, an aluminum frame (aluminum frame) made of aluminum. As shown in FIG. 1A, four frames 70 are used, and are attached to each of the four sides of the solar cell module 1. The frame 70 is fixed to each side of the solar cell module 1 with an adhesive, for example.

  Although not shown, the solar cell module 1 is provided with a terminal box for taking out the electric power generated by the solar cells 10. The terminal box is fixed to the back surface protection member 50, for example. The terminal box contains a plurality of circuit components mounted on the circuit board.

[Effects]
Next, the effect of the solar cell module 1 in the present embodiment will be described in comparison with the solar cell module 1A of the comparative example. FIG. 3 is a partially enlarged cross-sectional view of a solar cell module of a comparative example.

  As shown in FIG. 3, in the solar cell module 1 </ b> A of the comparative example, the light reflecting member 30 is arranged in the gap between two adjacent solar cells 10, similarly to the solar cell module 1 in the present embodiment. Yes.

  However, in the solar cell module 1 </ b> A of the comparative example, unlike the solar cell module 1 in the present embodiment, the thickness of the light reflecting member 30 is thinner than the thickness of the solar cell 10. For this reason, in the solar cell module 1 </ b> A of the comparative example, a leak current may be generated between the solar cells 10 through the conductive light reflecting film 32 of the light reflecting member 30.

  In particular, the solar cell 10 is made of a semiconductor material, and the semiconductor material may exist on the side surface of the solar cell 10. In this case, when the thickness of the light reflecting member 30 is thinner than the thickness of the solar battery cell 10, a leak current is generated between the solar battery cells 10 through the conductive light reflecting film 32 of the light reflecting member 30.

On the other hand, as shown in FIG. 2B, in the solar cell module 1 in the present embodiment, the thickness d _M of the light reflecting member 30 is thicker than the thickness d _C of the solar cell 10, and The surface of the conductive light reflecting film 32 on the solar cell 10 side is located on the outer side (surface protection member 40 side) than the surface of the solar cell 10.

  Thereby, since the electroconductive light reflection film | membrane 32 of the light reflection member 30 can be separated from the surface of the photovoltaic cell 10, generation | occurrence | production of a leakage current can be suppressed effectively. As a result, the reliability of the solar cell module 1 is improved.

  Moreover, in this Embodiment, although the light reflection member 30 was arrange | positioned so that the surface of the electroconductive light reflection film 32 might face the surface protection member 40, as shown in FIG. The surface of the conductive light reflecting film 32 may be disposed so as to face the back surface protection member 50. That is, the light reflecting member 30 may be disposed such that the insulating member 31 is located on the front surface protection member 40 side and the conductive light reflecting film 32 is located on the back surface protection member 50 side. Also in this case, the thickness of the light reflecting member 30 is larger than the thickness of the solar battery cell 10, and the surface of the conductive light reflecting film 32 on the solar battery cell 10 side is larger than the surface of the solar battery cell 10. Since it is located on the outer side (back surface protection member 50 side), generation of leakage current can be suppressed.

The thickness d _M of the light reflecting member 30 is preferably 55 μm or more thicker than the value obtained by adding the thickness d _C of the solar battery cell 10 and the uneven height d _{X of the} conductive light reflecting film 32.

From the viewpoint of ensuring further reliability of the solar cell module 1, the adjacent solar cells 10 are required to have pressure resistance against application of an impulse voltage of 800V, for example. In order to have this pressure resistance, it is preferable that the insulation distance between the adjacent solar cells 10 is 110 μm or more. That is, by making the thickness d _M of the light reflecting member 30 55 μm or more thicker than the value obtained by adding the thickness d _C of the solar battery cell 10 and the uneven height d _{X of the} conductive light reflecting film 32, It becomes possible to ensure an insulation distance of 110 μm or more between the adjacent solar cells 10. Therefore, even when the impulse voltage is applied, the generation of leakage current due to dielectric breakdown can be effectively suppressed. As a result, the reliability of the solar cell module 1 is further improved.

  Further, as shown in FIG. 2B, the distance d1 between the first solar cell 10A and the conductive light reflecting film 32 and the distance d2 between the second solar cell 10B and the conductive light reflecting film 32 are set. The added distance (d1 + d2), which is the added value, is preferably 110 μm or more. As a result, the insulation distance between the first solar battery cell 10A and the second solar battery cell 10B is ensured to be 110 μm or more. Therefore, even when the impulse voltage is applied, the leakage current due to the dielectric breakdown Can be reliably suppressed.

  In the light reflecting member 30 shown in FIG. 4, since the conductive light reflecting film 32 is provided on the back surface protection member 50 side, the insulating member 31 is preferably constituted by a light transmitting member such as a transparent member.

(Embodiment 2)
Next, the solar cell module 2 according to Embodiment 2 will be described with reference to FIGS. 5A and 5B. 5A and 5B are enlarged cross-sectional views around the light reflecting member of the solar cell module according to Embodiment 2. FIG.

  As shown in FIG. 5A, in the solar cell module 2 according to the present embodiment, the light reflecting member 30 protrudes into a gap between two adjacent solar cells 10 and the solar cells 10 It is provided so as to overlap the end.

  In this Embodiment, the light reflection member 30 is arrange | positioned ranging over two adjacent photovoltaic cells 10 (1st photovoltaic cell 10A and 2nd photovoltaic cell 10B). Specifically, one end portion in the width direction of the light reflecting member 30 is provided at the end portion of the first solar cell 10A so as to overlap the first solar cell 10A. Moreover, it is provided in the edge part of the 2nd photovoltaic cell 10B so that the edge part of the width direction of the light reflection member 30 may overlap with the 2nd photovoltaic cell 10B.

  Also in the present embodiment, the thickness of the light reflecting member 30 is thicker than the thickness of the solar battery cell 10.

  Thereby, as shown in FIG. 5B, even if one end of the light reflecting member 30 in the width direction has fallen from the solar battery cell 10 in the manufacturing process of the solar battery module 2 or the like, the dropout part The conductive light reflecting film 32 of the light reflecting member 30 is located on the outer side (back surface protecting member 50 side) than the surface of the solar battery cell 10. Moreover, although the whole light reflection member 30 may have fallen off from the photovoltaic cell 10 and may be in the state as shown in FIG. 2B, even in this case, the conductive light reflection film 32 of the light reflection member 30. Is positioned outside the surface of the solar battery cell 10.

  As described above, according to the solar cell module 2 according to the present embodiment, even when the light reflecting member 30 is detached from the solar battery cell 10, the conductive light reflecting film 32 of the light reflecting member 30 in the dropped portion. Can be separated from the surface of the solar battery cell 10. Therefore, since generation | occurrence | production of leak current can be avoided, the reliability of the solar cell module 2 improves.

  In the present embodiment, the light reflecting member 30 is disposed such that the surface of the conductive light reflecting film 32 faces the surface protection member 40. However, as shown in FIG. The surface of the conductive light reflecting film 32 may be disposed so as to face the back surface protection member 50. Also in this case, the thickness of the light reflecting member 30 is larger than the thickness of the solar battery cell 10, and the surface of the conductive light reflecting film 32 on the solar battery cell 10 side is larger than the surface of the solar battery cell 10. Located outside. Thereby, even if the light reflection member 30 falls out of the photovoltaic cell 10, generation | occurrence | production of a leakage current can be suppressed.

  5A, FIG. 5B, and FIG. 6, the distance d1 between the first solar battery cell 10A and the conductive light reflecting film 32, and the second The added distance (d1 + d2), which is a value obtained by adding the distance d2 between the solar battery cell 10B and the conductive light reflecting film 32, is preferably 110 μm or more.

  As a result, the insulation distance between the first solar battery cell 10A and the second solar battery cell 10B is ensured to be 110 μm or more. For example, even when an impulse voltage of 800 V is applied, dielectric breakdown occurs. It is possible to reliably suppress the occurrence of leakage current due to.

  5A and 5B has the conductive light reflecting film 32 on the surface protection member 40 side, the insulating member 31 is made of a translucent material such as a transparent material, and white. The light reflecting member 30A shown in FIG. 6 includes the conductive light reflecting film 32 on the back surface protection member 50 side. The material may be a translucent material such as a transparent material.

(Embodiment 3)
Next, the solar cell module 3 according to Embodiment 3 will be described with reference to FIG. FIG. 7 is an enlarged cross-sectional view around the light reflecting member of the solar cell module according to Embodiment 3.

  As shown in FIG. 7, the solar cell module 3 according to the present embodiment is the solar cell module 1 according to the first embodiment, wherein the insulating member 31 has a laminated structure of a resin base 31 a and an adhesive layer 31 b. The conductive light reflecting film 32 is formed on the surface of the resin base 31a opposite to the adhesive layer 31b.

  That is, in the present embodiment, the light reflecting member 30A has a configuration in which the adhesive layer 31b is provided in advance. Specifically, the light reflecting member 30A includes a resin substrate 31a, a conductive light reflecting film 32 formed on one surface of the resin substrate 31a, and an adhesive provided on the other surface of the resin substrate 31a. And the layer 31b.

  The resin base 31a is made of an insulating resin material such as PET or acrylic. The adhesive layer 31b is a resin adhesive made of an insulating resin material such as EVA. In the present embodiment, the resin base material 31a is a PET sheet, and the adhesive layer 31b is a heat-sensitive adhesive or pressure-sensitive adhesive made of EVA. In addition, the unevenness | corrugation 30a is formed in the surface of the resin base material 31a. As a result, the surface of the conductive light reflecting film 32 is uneven.

  Also in the present embodiment, as in the first embodiment, the thickness of the light reflecting member 30 </ b> A is thicker than the thickness of the solar battery cell 10, and the solar battery cell 10 of the conductive light reflecting film 32. The side surface is located on the outer side (surface protection member 40 side) than the surface of the solar battery cell 10.

  Thereby, since the electroconductive light reflection film 32 of the light reflection member 30A can be separated from the surface of the solar battery cell 10, generation of leakage current can be effectively suppressed. As a result, the reliability of the solar cell module 1 is improved.

  Further, in the present embodiment, since the light reflecting member 30A has the adhesive layer 31b, the light reflecting member 30A can be easily disposed at a predetermined position.

  In the present embodiment, the light reflecting member 30A is disposed so that the surface of the conductive light reflecting film 32 faces the surface protection member 40. However, as shown in FIG. The surface of the conductive light reflecting film 32 may be disposed so as to face the back surface protection member 50. Also in this case, the thickness of the light reflecting member 30 </ b> A is thicker than the thickness of the solar battery cell 10, and the surface of the conductive light reflecting film 32 on the solar battery cell 10 side is larger than the surface of the solar battery cell 10. Since it is located on the outer side (back surface protection member 50 side), generation of leakage current can be suppressed.

The thickness d _M of the light reflecting member 30A shown in FIGS. 7 and 8 is a value obtained by adding the thickness d _C of the solar battery cell 10 and the uneven height d _{X of the} conductive light reflecting film 32. The thickness is preferably 55 μm or more. Thereby, it becomes possible to ensure an insulation distance of 110 μm or more between the adjacent solar battery cells 10. Therefore, for example, even when an impulse voltage of 800 V is applied, generation of a leakage current due to dielectric breakdown can be effectively suppressed.

  Further, an addition distance that is a value obtained by adding the distance d1 between the first solar battery cell 10A and the conductive light reflecting film 32 and the distance d2 between the second solar battery cell 10B and the conductive light reflecting film 32. (D1 + d2) is preferably 110 μm or more. As a result, the insulation distance between the first solar battery cell 10A and the second solar battery cell 10B is ensured to be 110 μm or more. Therefore, even when the impulse voltage is applied, the leakage current due to the dielectric breakdown Can be reliably suppressed.

  Since the light reflecting member 30A shown in FIG. 7 has the conductive light reflecting film 32 on the surface protection member 40 side, the resin base material 31a and the adhesive layer 31b are made of a translucent material such as a transparent material, and the like. The light reflecting member 30A shown in FIG. 8 has a conductive light reflecting film 32 on the back surface protecting member 50 side, and thus may be any of non-translucent materials such as white materials and black materials. The material of the material 31a and the adhesive layer 31b is preferably a light-transmitting material such as a transparent material.

(Embodiment 4)
Next, the solar cell module 4 according to Embodiment 4 will be described with reference to FIG. FIG. 9 is an enlarged sectional view around the light reflecting member of the solar cell module according to Embodiment 4.

  As shown in FIG. 9, the solar cell module 4 according to the present embodiment is the same as the solar cell module 2 in the second embodiment, but the insulating member 31 has a laminated structure of a resin base 31a and an adhesive layer 31b. The conductive light reflecting film 32 is formed on the surface of the resin base 31a opposite to the adhesive layer 31b.

  That is, in the present embodiment, the light reflecting member 30A includes the resin base 31a, the conductive light reflecting film 32 formed on one surface of the resin base 31a, and the resin base, as in the third embodiment. It is comprised by the contact bonding layer 31b provided in the other surface of the material 31a. The materials and structures of the resin base material 31a and the adhesive layer 31b are the same as those in the third embodiment.

  Also in the present embodiment, the thickness of the light reflecting member 30 </ b> A is thicker than the thickness of the solar battery cell 10 as in the second embodiment.

  Thereby, even if it is a case where 30 A of light reflection members have fallen from the photovoltaic cell 10, the surface by the side of the photovoltaic cell 10 of the electroconductive light reflection film 32 of the light reflection member 30A of a dropping part is a photovoltaic cell. 10 is located on the outer side (the back surface protection member 50 side) than the surface of 10. As a result, the conductive light reflecting film 32 of the light reflecting member 30 in the falling portion can be separated from the surface of the solar battery cell 10. Therefore, since generation | occurrence | production of leak current can be avoided, the reliability of the solar cell module 2 improves.

  Furthermore, in this embodiment, since the light reflecting member 30A has the adhesive layer 31b, the light reflecting member 30A can be easily disposed at the end of the solar battery cell 10. For example, before laminating the string 10S in which the plurality of solar cells 10 are connected by the tab wiring 20 with the front surface side filling member 61 and the back surface side filling member 62, the solar cell is placed at a predetermined position of the light reflecting member 30A. It can be affixed to the cell 10. Therefore, the light reflecting member 30A can be arranged with high accuracy.

  In the present embodiment, as shown in FIG. 10, the thickness of the adhesive layer 31 b of the light reflecting member 30 </ b> A is preferably thicker than the thickness of the solar battery cell 10. Thereby, it can suppress that 30 A of light reflection members curve. This point will be described in detail with reference to FIGS. 11A and 11B. FIG. 11A is an enlarged cross-sectional view around the light reflecting member of the solar cell module according to Embodiment 4 shown in FIG. FIG. 11B is an enlarged cross-sectional view around the light reflecting member in the solar cell module according to Modification 1 of Embodiment 4 shown in FIG. 10.

  As described above, after a plurality of solar cells 10 are connected by the tab wiring 20 to form the string 10S, a lamination process is performed. In other words, the plurality of strings 10S in which the light reflecting members 30A are arranged in the solar cells 10 are sandwiched between the front surface side filling member 61 and the back surface side filling member 62, the front surface protection member 40, and the back surface protection member 50, and are subjected to thermocompression bonding. Do. The light reflecting member 30 </ b> A receives pressure from the front surface side filling member 61 and the back surface side filling member 62 by thermocompression bonding at the time of the laminating process.

  In this case, as shown in FIG. 11A, if the thickness of the adhesive layer 31b of the light reflecting member 30A is less than the thickness of the solar battery cell 10, the two light reflecting members 30A are adjacent to each other due to pressing during the lamination process. It may be curved so as to protrude toward the gap between the solar cells 10. When the light reflecting member 30A is curved, the light incident on the light reflecting member 30A cannot be guided to a desired location of the solar battery cell 10, and a desired power generation efficiency improvement effect is obtained by arranging the light reflecting member 30A. Disappear.

  On the other hand, as shown in FIG. 11B, if the thickness of the adhesive layer 31b of the light reflecting member 30A is equal to or greater than the thickness of the solar battery cell 10, even if the light reflecting member 30A is pressed during the lamination process. The light reflecting member 30A can be prevented from being bent. Thereby, since the light incident on the light reflecting member 30A can be reflected and guided to a desired portion of the solar battery cell 10, a desired power generation efficiency improvement effect can be obtained by arranging the light reflecting member 30A. .

  Further, by making the thickness of the adhesive layer 31b of the light reflecting member 30A thicker than the thickness of the solar battery cell 10, the adhesive layer 31b can cover a part of the back side collector electrode 12 of the solar battery cell 10, It can suppress that the back side collector electrode 12 peels. This point will be described in detail with reference to FIGS. 12A and 12B. 12A is a partially enlarged cross-sectional view of another aspect of the solar cell module according to Modification 1 of Embodiment 4 shown in FIG. FIG. 12B is a partially enlarged rear view of the solar cell module shown in FIG. 12A.

  As shown in FIGS. 12A and 12B, when the thickness of the adhesive layer 31b of the light reflecting member 30A is equal to or greater than the thickness of the solar battery cell 10, the adhesive layer 31b of the light reflecting member 30A is pressed by the pressing during the lamination process. It is possible to wrap around the back surface of the solar battery cell 10 (the surface opposite to the surface on which the light reflecting member 30A is provided). Thereby, a part of back surface collecting electrode 12 provided in the back surface of the photovoltaic cell 10 can be coat | covered with the contact bonding layer 31b which went around to the back surface of the photovoltaic cell 10. FIG. Specifically, the end portions of the plurality of finger electrodes of the back side collector electrode 12 are covered with the adhesive layer 31b. As a result, since the edge part of the back surface collecting electrode 12 can be suppressed with the contact bonding layer 31b, it can suppress that the edge part of the finger electrode of the back side collecting electrode 12 peels.

  Further, as shown in FIGS. 9 and 10, in the present embodiment, the light reflecting member 30A is arranged so that the surface of the conductive light reflecting film 32 faces the surface protection member 40. As shown in FIG. 14 and FIG. 14, the light reflecting member 30 </ b> A may be disposed such that the surface of the conductive light reflecting film 32 faces the back surface protection member 50. Also in this case, the thickness of the light reflecting member 30A is larger than the thickness of the solar battery cell 10, and is located outside the surface of the conductive light reflecting film 32 on the solar battery cell 10 side. . Thereby, generation | occurrence | production of a leakage current can be suppressed when 30 A of light reflection members drop from the photovoltaic cell 10. FIG.

  Even in the arrangement of the light reflecting member 30A shown in FIGS. 9, 10, 13 and 14, the distance d1 between the first solar cell 10A and the conductive light reflecting film 32, and the second The added distance (d1 + d2), which is a value obtained by adding the distance d2 between the solar battery cell 10B and the conductive light reflecting film 32, is preferably 110 μm or more.

  As a result, the insulation distance between the first solar battery cell 10A and the second solar battery cell 10B is ensured to be 110 μm or more. For example, even when an impulse voltage of 800 V is applied, dielectric breakdown occurs. It is possible to reliably suppress the occurrence of leakage current due to.

  In addition, since the light reflection member 30A shown in FIGS. 9 and 10 has the conductive light reflection film 32 on the surface protection member 40 side, the resin base material 31a and the adhesive layer 31b are made of a translucent material such as a transparent material. The light reflecting member 30A shown in FIGS. 13 and 14 may be a conductive light reflecting film 32 on the back surface protection member 50 side, although it may be any of a material and a non-translucent material such as a white material or a black material. Therefore, the material of the resin base material 31a and the adhesive layer 31b is preferably composed of a translucent material such as a transparent material.

(Modifications, etc.)
As mentioned above, although the solar cell module which concerns on this invention was demonstrated based on Embodiment 1-4, this invention is not limited to the said Embodiment 1-4.

  For example, in each of the above embodiments, the light reflecting members 30 and 30A have been described as being disposed between two adjacent solar battery cells 10, but the present invention is not limited thereto. As another example of arrangement, the light reflecting members 30 and 30A may be arranged adjacent to the outermost solar cell 10 adjacent to the frame 70 as shown in FIG. Also in this case, the light reflecting member 30 may be disposed upside down, or may be disposed so as to overlap the end portion of the front surface or the back surface of the solar battery cell 10.

  In each of the above embodiments, the light reflecting members 30 and 30A are arranged in the gap between two adjacent strings 10S. However, the present invention is not limited to this. For example, as illustrated in FIG. 16, the light reflecting member 300 may be disposed in a gap between two adjacent solar cells 10 in the string 10 </ b> S.

  Moreover, in each said embodiment, although the light reflection members 30 and 30A were provided so that it might respond | correspond to all the photovoltaic cells 10, it is provided only with respect to some photovoltaic cells 10. Also good. In other words, there may be a space between solar cells in which the light reflecting member 30 is not provided.

  In each of the above embodiments, a plurality of light reflecting members 30 and 30A are provided for each gap between the adjacent solar cells 10 along the longitudinal direction of the string 10S in the gap between two adjacent strings 10S. However, it is not limited to this. For example, the light reflecting members 30 and 30A may be provided so as to straddle a plurality of solar cells 10 along the longitudinal direction of the string 10S in a gap between two adjacent strings 10S. As an example, as illustrated in FIG. 17, the light reflecting members 30 and 30 </ b> A may be one long light reflecting sheet over the entire string 10 </ b> S.

  In each of the above embodiments, the light reflecting members 30 and 30A have the conductive light reflecting film 32 formed on the outermost surface. However, the present invention is not limited to this. For example, as shown in FIG. 18, the light reflecting member 30B includes an insulating member 33 (second insulating member) on a conductive light reflecting film 32 formed on the insulating member 31 (first insulating member). The formed structure may be sufficient. In this case, it is necessary to use a translucent material as the material of the insulating member 33. For example, the insulating member 33 may be a transparent member made of a transparent resin material.

  Moreover, in each said embodiment, the number of the light reflection members 30 and 30A provided in the clearance gap between the two adjacent photovoltaic cells 10 may not be one but two or more. .

  Moreover, in each said embodiment, although the semiconductor substrate of the photovoltaic cell 10 was made into the n-type semiconductor substrate, the semiconductor substrate may be a p-type semiconductor substrate.

  Further, in each of the above embodiments, the solar cell module is a single-sided light receiving system in which only the surface protective member 40 is a light receiving surface, but both surfaces are provided in which both the front surface protecting member 40 and the back surface protecting member 50 are light receiving surfaces. A light receiving method may be used.

  Moreover, in said each embodiment, although the semiconductor material of the photoelectric conversion part of the photovoltaic cell 10 was silicon, it is not restricted to this. As a semiconductor material of the photoelectric conversion part of the solar battery cell 10, gallium arsenide (GaAs), indium phosphide (InP), or the like may be used.

  In addition, it is realized by arbitrarily combining the components and functions in each embodiment without departing from the scope of the present invention, or the form obtained by making various modifications conceived by those skilled in the art to each embodiment. Forms to be made are also included in the present invention.

1, 2, 3, 4 Solar cell module 10 Solar cell 10A First solar cell 10B Second solar cell 10S String 20 Tab wiring 30, 30A, 30B, 300 Light reflecting member 30a Concavity and convexity 31, 33 Insulating member 31a Resin base material 31b Adhesive layer 32 Conductive light reflecting film 40 Surface protection member 50 Back surface protection member 60 Filling member 61 Surface side filling member 62 Back surface side filling member 70 Frame

Claims (9)

A first solar cell;
A light reflecting member at least a part of which is located on a side of the first solar battery cell;
The light reflecting member has an insulating member and a conductive light reflecting film formed on the surface of the insulating member,
The thickness of the light reflecting member is thicker than the thickness of the first solar cell,
The surface of the conductive light reflecting film on the first solar cell side is positioned outward from the surface of the first solar cell. Furthermore, it comprises a second solar cell arranged with a gap with the first solar cell,
The solar cell module according to claim 1, wherein the light reflecting member is provided between the first solar cell and the second solar cell. Furthermore, it comprises a second solar cell arranged with a gap with the first solar cell,
The solar cell module according to claim 1, wherein the light reflecting member is provided so as to protrude into the gap and overlap with an end portion of the first solar cell. The solar cell module according to claim 3, wherein the light reflecting member is disposed across the first solar cell and the second solar cell. The insulating member is a laminated structure of a resin base material and an adhesive layer,
The solar cell module according to claim 3 or 4, wherein the conductive light reflecting film is formed on a surface of the resin base material opposite to the adhesive layer side. The solar cell module according to claim 5, wherein a thickness of the adhesive layer is thicker than a thickness of the first solar cell. Collector electrodes are provided on both sides of the first solar cell,
The adhesive layer wraps around the surface of the first solar cell opposite to the surface on which the light reflecting member is provided and covers a part of the collector electrode provided on the surface on the opposite side. The solar cell module according to claim 5 or 6. The surface shape of the insulating member is an uneven shape,
The surface shape of the conductive light reflecting film is an uneven shape following the uneven shape,
3. The solar cell module according to claim 1, wherein the thickness of the light reflecting member is 55 μm or more than a value obtained by adding the thickness of the first solar cell and the height of the unevenness of the conductive light reflecting film. . The added distance, which is a value obtained by adding the distance between the first solar cell and the conductive light reflecting film and the distance between the second solar cell and the conductive light reflecting film, is 110 μm or more. The solar cell module according to any one of claims 2 to 7.

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