JP2018056454A - Solar battery module and manufacturing method of solar battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module capable of effectively utilizing incident light and capable of suppressing degradation of performance.SOLUTION: A solar battery module 1 includes: a plurality of solar battery cells 10 aligned at least on one line; a surface protection member 40 arranged on the surface side of the plurality of solar battery cells 10; and a surface side filling member 61 arranged between the plurality of solar battery cells 10 and the surface protection member 40. The solar battery module 1 further includes a light reflection member 30 arranged on a position closer to the surface protection member 40 than the plurality of solar battery cells 10 and an adhesive member 90 which is the adhesive member 90 interposed between the light reflection member 30 and the surface protection member 40 and is formed by a material having a physical property different from that of the surface side filling member 61.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a solar cell module and a method for manufacturing 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 is disposed between the solar cells as in the above-described conventional technology, for example, the solar cell and the light reflecting the temperature change due to different thermal expansion coefficients of the solar cell and the light reflecting member. There is a possibility that the reflecting members are pressed or pulled together. Thereby, for example, a solar battery cell or a light reflecting member is damaged, and as a result, there is a possibility that problems such as a decrease in power generation capability may occur.

  In view of the above-described conventional problems, an object of the present invention is to provide a solar cell module in which incident light can be used effectively and deterioration in performance is suppressed.

  In order to achieve the above object, a solar cell module according to an aspect of the present invention includes a plurality of solar cells arranged in at least one row, and a surface arranged on the surface side of the plurality of solar cells. A protective member, a first filling member disposed between the plurality of solar cells and the surface protection member, and a light reflecting member disposed at a position closer to the surface protection member than the plurality of solar cells. And a second filling member interposed between the light reflecting member and the surface protection member, wherein the second filling member is formed of a material having physical properties different from those of the first filling member.

  The method for manufacturing a solar cell module according to one aspect of the present invention includes a pasting step of pasting a light reflecting member to a surface protecting member via an adhesive member, and the light reflecting member of the surface protecting member is pasted. A filling member disposing step of disposing a filling member on the opposite side, and a cell disposing step of disposing a plurality of solar cells on the opposite side of the filling member from the surface protection member.

  ADVANTAGE OF THE INVENTION According to this invention, the incident light can be used effectively and the solar cell module by which the deterioration of performance was suppressed and its manufacturing method can be provided.

It is a top view of the solar cell module which concerns on embodiment. It is sectional drawing of the solar cell module which concerns on embodiment in the II-II line | wire of FIG. It is a partially expanded plan view of the solar cell module according to the embodiment. It is sectional drawing (enlarged sectional drawing of a light reflection member periphery) of the solar cell module which concerns on embodiment in the IV-IV line | wire of FIG. It is sectional drawing which shows typically the example of the course of the light which injects into the interface of a surface protection member and an adhesive member. It is a 1st figure for demonstrating the manufacturing method of the solar cell module which concerns on embodiment. It is a 2nd figure for demonstrating the manufacturing method of the solar cell module which concerns on embodiment. It is sectional drawing of a solar cell module when a light reflection member is arrange | positioned along tab wiring.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Each of the embodiments described below shows a comprehensive or specific example. Numerical values, shapes, materials, constituent elements, arrangement positions and connection forms of constituent elements, processes, order of processes, and the like shown in the following embodiments are merely examples, and are not intended to limit the present invention. In addition, among the constituent elements in the following embodiments, constituent elements that are not described in the independent claims indicating the highest concept 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 may be abbreviate | omitted or simplified.

(Embodiment)
[Configuration of solar cell module]
First, a schematic configuration of the solar cell module 1 according to the embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is a plan view of a solar cell module 1 according to an embodiment. FIG. 2 is a cross-sectional view of the solar cell module 1 taken along line II-II in FIG.

  1 and 2, the Z axis is an axis perpendicular to the main surface of the solar cell module 1 (an axis parallel to the thickness direction of the solar cell module 1), and the X axis and the Y axis are orthogonal to each other. And all are axes orthogonal to the Z-axis. The same applies to the Z-axis, X-axis, and Y-axis in FIGS.

  As shown in FIGS. 1 and 2, 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 front surface protection member 40 and a back surface protection member 50. Yes. Specifically, 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, a filling member 60, and a frame 70. Is provided.

  As shown in FIG. 1, the shape of the solar cell module 1 in plan view (when the solar cell module 1 is viewed from the surface protection member 40 side, the same applies hereinafter) 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 FIGS. 3 and 4 with reference to FIGS. 1 and 2. FIG. 3 is an enlarged view of a region A surrounded by a broken line in FIG. 1, and is a partially enlarged plan view of the solar cell module 1 according to the embodiment. 4 is a cross-sectional view of the solar cell module 1 taken along line IV-IV in FIG. FIG. 4 is an enlarged cross-sectional view around the light reflecting member 30.

[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. 1, a plurality of solar cells 10 are arranged in a matrix (matrix shape) on the same plane.

  In the present embodiment, a plurality of solar cells 10 arranged in a straight line along the row direction (X-axis direction) form a string by connecting two adjacent solar cells 10 by tab wiring 20. doing. Specifically, the plurality of solar cells 10 in one string 10 </ b> S are connected in series by tab wiring 20.

  As shown in FIG. 1, in the present embodiment, 12 strings of solar cells 10 arranged at equal intervals along the row direction are connected by a tab wiring 20 to form one string 10 </ b> S. . More specifically, each string 10 </ b> S is configured by sequentially connecting two solar cells 10 adjacent in the row direction with three tab wires 20.

  Moreover, the solar cell module 1 according to the present embodiment includes a plurality of strings 10S, and the plurality of strings 10S are arranged along the column direction (Y-axis direction). In the present embodiment, as shown in FIG. 1, six strings 10S are arranged at equal intervals along the column direction so as to be parallel to each other.

  In addition, the number of the photovoltaic cells 10 which comprise the string 10S should just be 2 or more, and the number of the strings 10S with which the solar cell module 1 is provided should just be 1 or more.

  In the present embodiment, the leading solar cell 10 in each string 10 </ b> S is connected to the crossover wiring (not shown) via the 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. Thus, a plurality of (six in FIG. 1) 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.

  In the solar cell module 1 having the above configuration, as shown in FIGS. 1 and 3, the plurality of solar cells 10 are arranged with a gap between the solar cells 10 adjacent in the row direction and the column direction. ing. As will be described later, the light reflecting member 30 is disposed on the surface protection member 40 side of 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, for example, a 125 mm square square. 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 pn junction as a basic structure. As an example, an n-type single crystal silicon substrate that is an n-type semiconductor substrate and one main surface side (front surface side) of the n-type single crystal silicon substrate. The n-type amorphous silicon layer and the n-side front surface electrode that are sequentially formed, and the p-type amorphous silicon layer and the p that are sequentially formed on the other main surface side (back surface side) of the n-type single crystal silicon substrate. It is comprised by the side surface electrode. The n-side surface electrode and the p-side surface electrode are transparent electrodes such as ITO (Indium Tin Oxide). An i-type amorphous silicon layer or a silicon oxide layer between the n-type single crystal silicon substrate and the n-type amorphous silicon layer or between the n-type single crystal silicon substrate and the p-type amorphous silicon layer Such a passivation layer may be provided to suppress recombination of the generated carriers. 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, a reflective metal electrode may be sufficient, a transparent electrode and a metal electrode The laminated body may be sufficient.

  As shown in FIGS. 2 and 4, the solar cell 10 includes a front-side collector electrode 11 (n-side collector electrode) electrically connected to the n-side surface electrode of the solar cell 10, and the solar 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) can be 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 FIG.1 and FIG.2, the tab wiring 20 (interconnector) electrically connects two adjacent photovoltaic cells 10 in the string 10S. As shown in FIG.1 and FIG.3, in this Embodiment, the two adjacent photovoltaic cells 10 are connected by the three tab wiring 20 arrange | positioned mutually substantially parallel. Each tab wiring 20 is extended along the X-axis direction with respect to the two photovoltaic cells 10 arranged in the X-axis direction.

  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.

  When attention is paid to one tab wiring 20, as shown in FIG. 2, one end of the tab wiring 20 is arranged on one surface of two adjacent solar cells 10, and the other end of the tab wiring 20. However, it is arrange | positioned at the other back surface of the two adjacent photovoltaic cells 10. FIG.

  That is, each tab wiring 20 includes two adjacent solar cells 10, one n-side collector electrode (front-side collector electrode) of one solar cell 10 and the other p-side collector electrode ( The back side collector electrode) is electrically connected. Specifically, the tab wiring 20 is joined to the bus bar electrode of the front collector electrode 11 of one solar cell 10 and the bus bar electrode of the back 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, the front-side collector electrode 11, and 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 is incident on the surface of the tab wiring 20, the light is scattered by the unevenness and the interface between the surface protection member 40 and the external air layer (hereinafter referred to as “outside”). It is also referred to as an “interface”) or reflected at the interface between the surface protection member 40 and the filling member 60 and can be led to the solar cell 10. 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. In addition, a light reflecting member having an uneven surface may be separately laminated on the tab wiring 20 having a flat surface.

[Filling member]
The filling member 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. 4, 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. A method for manufacturing solar cell module 1 according to the present embodiment will be described later with reference to FIGS.

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

  The back surface side filling member 62 is a resin sheet made of a resin material such as EVA, for example, and is filled so as to mainly fill a gap between the solar battery cell 10 and the back surface protection member 50 by a laminating process. 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.

[Surface protection member and back surface protection member]
The surface protection member 40 is a member that protects the front side surface of the solar cell module 1 and protects the inside of the solar cell module 1 (solar cell 10 or the like) from an external environment such as wind and rain or external impact. As shown in FIG. 2, 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.

  The back surface protection member 50 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. 2, 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.

  Between the surface protection member 40 and the back surface protection member 50, the filling member 60 is filled as described above. 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.

[Light reflecting member]
As shown in FIGS. 1, 3, and 4, the solar cell module 1 includes a light reflecting member 30. In the present embodiment, the light reflecting member 30 is disposed at a position closer to the surface protection member 40 than the plurality of solar cells 10. That is, the light reflection member 30 is disposed on the surface protection member 40 on the side of the plurality of solar cells 10, and the surface protection member 40 and the light reflection member 30 in the thickness direction (Z-axis direction) of the solar cell module 1. Is shorter than the distance between the surface protection member 40 and the plurality of solar battery cells 10.

  More specifically, the light reflecting member 30 is a region between two adjacent solar cells 10 that are adjacent to each other among the plurality of solar cells 10 and are not connected by the tab wiring 20. Is disposed on the surface protection member 40 side (hereinafter also referred to as “upward” for convenience of explanation). Therefore, the light reflecting member 30 and the tab wiring 20 are arranged so as not to overlap when viewed from the Z-axis direction.

  Further, as shown in FIG. 1, a plurality of light reflecting members 30 are provided along the longitudinal direction (X-axis direction) of the strings 10 </ b> S at positions corresponding to the gaps between the two adjacent strings 10 </ b> S in plan view. It has been. Specifically, the light reflecting member 30 is provided for each gap between two solar cells 10 adjacent in the Y-axis direction in the gap between two strings 10 </ b> S elongated in the X-axis direction.

  As shown in FIG. 3, each light reflecting member 30 is a tape-like light reflecting sheet extending in the longitudinal direction of the string 10 </ b> S, 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 160 mm and a width of 1 mm to 20 mm.

  Each light reflecting member 30 covers a gap between two adjacent solar cells 10 in plan view. That is, the width W1 of the light reflecting member 30 is the same (including substantially the same) as the gap W2 between the gaps between two adjacent solar cells 10 (see FIG. 4).

  As shown in FIG. 4, 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. As shown in FIG. 4, the light reflecting member 30 is preferably arranged so that the end in the Y-axis direction of the light reflecting member 30 and the end in the Y-axis direction of the solar battery cell 10 are substantially aligned. Considering restrictions on the manufacturing process, the light reflecting member 30 and the solar battery cell 10 may be arranged so as to partially overlap when viewed from the Z-axis direction. At this time, the light reflecting member 30 overlaps with the solar battery cell 10, but is preferably disposed so as not to overlap with the front-side collector electrode 11, and is disposed so as not to overlap with the n-side surface electrode formed of a transparent electrode. Is more preferable.

  The insulating member 31 is made of an insulating resin material having a softening temperature higher than that of the filling member 60, 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 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 uneven surface by, for example, vapor deposition. As a result, the surface shape of the conductive light reflecting film 32 is an uneven shape that follows the unevenness of the insulating member 31. Since the conductive light reflecting film 32 has an uneven shape, the light incident on the light reflecting member 30 can be diffusely reflected. At least a part of the light diffusely reflected by the light reflecting member 30 is totally reflected at the outer interface of the surface protection member 40 and enters one of the solar cells 10.

[Adhesive member]
As shown in FIG. 4, the solar cell module 1 according to this embodiment includes an adhesive member 90 that is interposed between the light reflecting member 30 and the surface protection member 40. The adhesive member 90 is an example of a second filling member, and the gap between the light reflecting member 30 and the surface protection member 40 is filled with the adhesive member 90.

  That is, the gaps between the plurality of solar cells 10 and the surface protection member 40 are filled with the surface side filling member 61 (first filling member) as a whole, and the light reflecting member 30 and the surface protection member 40 The portion between the two is filled with an adhesive member 90 (second filling member). Further, since the light reflecting member 30 is fixed to the surface protection member 40 by the adhesive member 90, the light reflecting member 30 can be disposed in a state where it does not contact the solar battery cell 10, as shown in FIG. Specifically, a part of the surface-side filling member 61 is interposed between the light reflecting member 30 and the plurality of solar cells 10.

  The adhesive member 90 is, for example, an EVA adhesive. Here, the surface-side filling member 61 and the adhesive member 90 are formed of materials having different physical properties. Specifically, the melt flow rate (MFR) of the material of the adhesive member 90 is smaller than the MFR of the material of the surface-side filling member 61.

  For example, when EVA resin is used as the material of the adhesive member 90 and the surface side filling member 61, the molecular weight of the EVA resin used for the adhesive member 90 is larger than the molecular weight of the VA resin used for the surface side filling member 61. The MFR of the adhesive member 90 is smaller than the MFR of the front side filling member 61. The MFR may be adjusted by adding an inorganic filler or an organic filler to the EVA resin, for example.

  That is, simply speaking, for example, in a high heat environment, the adhesive member 90 is less likely to flow than the front-side filling member 61. Therefore, in a state where the light reflecting member 30 is disposed on the surface protection member 40 via the adhesive member 90, the surface side filling member 61, the plurality of solar cells 10 (the plurality of strings 10S), and the like are disposed to perform the laminating process. In such a case, the light reflecting member 30 is hardly displaced.

  Examples of the material of the adhesive member 90 include resins such as polyolefin such as polyethylene or polypropylene other than EVA resin.

  In addition, the refractive index of the adhesive member 90 disposed between the surface protection member 40 and the light reflection member 30 in contact with the surface protection member 40 made of glass is larger than that of the surface protection member 40. Thereby, more efficient utilization of the light incident on the interface between the surface protection member 40 and the adhesive member 90 is achieved. In the present embodiment, the refractive index of the surface-side filling member 61 is substantially the same as that of the surface protection member 40.

  FIG. 5 is a cross-sectional view schematically showing an example of the path of light incident on the interface between the surface protection member 40 and the adhesive member 90.

  Further, for example, as shown in FIG. 5, the light L that is directed to the interface from the direction orthogonal to the interface between the surface protection member 40 and the adhesive member 90 is reflected by the light reflecting member 30, for example, diagonally upward to the left. The process proceeds to the direction further tilted to the left by refracting at the interface. As a result, the light L is totally reflected at the interface (outer interface) between the surface protection member 40 and the external air layer, proceeds further leftward from the totally reflected position, and passes through the surface side filling member 61. The solar battery cell 10 is reached.

  For example, as shown in FIG. 5, the light R traveling from the upper right to the interface between the surface protection member 40 and the adhesive member 90 is refracted at the interface and reflected by the light reflecting member 30. Proceed diagonally upward. The light R is further refracted at the interface and proceeds in a direction tilted further to the right. As a result, the light R is totally reflected at the outer interface, travels further to the right from the totally reflected position, passes through the surface-side filling member 61, and reaches the solar battery cell 10.

  As described above, since the refractive index of the adhesive member 90 is larger than the refractive index of the surface protection member 40, the light incident on the adhesive member 90 from the surface protection member 40 and reflected by the light reflection member 30 is reflected on the surface protection member. The possibility of being totally reflected at the outer interface 40 and entering the solar battery cell 10 is improved. That is, the light incident on the light reflecting member 30 can be efficiently used for power generation.

[flame]
The frame 70 is a member that forms the outer frame of the solar cell module 1. The frame 70 is, for example, an aluminum frame (aluminum frame) made of aluminum. As shown in FIG. 1, 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 in FIG. 1, 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.

[Method for manufacturing solar cell module]
Next, the manufacturing method of the solar cell module 1 according to the present embodiment will be described with reference to FIGS. FIG. 6 is a first diagram for explaining a manufacturing method of solar cell module 1 according to the embodiment, and FIG. 7 is a second diagram for explaining the manufacturing method.

  First, as shown in FIG. 6A, the surface protection member 40 and the light reflecting member 30 are pasted with an adhesive member 90. Specifically, as shown in FIGS. 1 and 3, each of the plurality of light reflecting members 30 needs to be positioned between two solar cells 10 adjacent in the Y-axis direction in plan view. Therefore, the application position of each light reflecting member 30 in the surface protection member 40 is determined according to the size and arrangement position of each solar battery cell 10, and the adhesive member 90 is arranged at each determined application position. Further, for example, the light reflecting member 30 is pressed against each of the plurality of adhesive members 90 arranged on the surface protecting member 40, so that each of the plurality of light reflecting members 30 is at a predetermined position of the surface protecting member 40. Affixed to

  In addition, there is no limitation in particular in the method of sticking the light reflection member 30 to the surface protection member 40. For example, the adhesive member 90 is previously attached to the surface of the light reflecting member 30 on the insulating member 31 side, and then the adhesive member 90 is attached to the surface protecting member 40, so that the light reflecting member 30 is attached to the surface protecting member 40. It may be affixed. Further, when a heat-sensitive adhesive is used as the adhesive member 90, a heating step may be included in the step of attaching the light reflecting member 30 to the surface protection member 40.

  Next, as shown in FIG. 6B, the surface side filling member 61 (filling member) is provided on the side of the surface protection member 40 on which the light reflecting member 30 (a plurality of light reflecting members 30 in this embodiment) is attached. ) Is arranged. In addition, a plurality of solar cells 10 (a plurality of strings 10S in the present embodiment) are arranged on the surface-side filling member 61 on the side opposite to the surface protection member 40. Furthermore, the back surface side filling member 62 and the back surface protection member 50 are arrange | positioned on the some string 10S. Thereby, a laminated body in which a plurality of members are laminated is formed. And this laminated body is thermocompression-bonded and a solar cell panel is produced (lamination process).

  Specifically, this laminated body is subjected to thermocompression bonding (heating and pressure bonding) in a vacuum at a temperature of, for example, 100 ° C. or higher. By this thermocompression bonding, the front-side filling member 61 and the back-side filling member 62 that were in the form of a sheet are heated and melted to become a filling member 60 that seals the solar cells 10. Thereby, the solar cell panel 2 (refer FIG. 7) is producible.

  Thereafter, as shown in FIG. 7A, the solar cell panel 2 is subjected to a heat treatment at around 150 ° C. in order to cause cross-linking that strengthens the resin molecular bond in the filling member 60 (curing step). This step is performed when crosslinkable EVA is used as the material of the filling member 60 (the front surface side filling member 61 and the back surface side filling member 62), but a non-crosslinking resin is used as the material of the filling member 60. There is no need to do this if used.

  Next, as shown in FIG. 7B, a frame 70 is attached to the solar cell panel 2 (framing process). Specifically, the frame 70 is fixed to the peripheral edge of each of the four sides of the solar cell panel 2 with an adhesive such as silicone resin.

  Next, as shown in FIG. 7C, the terminal box 80 is attached to the back surface protection member 50. At this time, a silicone resin is potted in the terminal box 80. Thereby, the solar cell module 1 is obtained. In addition, although not shown in figure, output measurement (finished product inspection) etc. of the solar cell module 1 are performed after that.

[Effects]
As described above, the solar cell module 1 according to the present embodiment includes a plurality of solar cells 10 arranged in at least one row, and a surface protection arranged on the surface side of the plurality of solar cells 10. The member 40 and the surface side filling member 61 arrange | positioned between the some photovoltaic cell 10 and the surface protection member 40 are provided. The solar cell module 1 further includes a light reflecting member 30 disposed closer to the surface protecting member 40 than the plurality of solar cells 10, and an adhesive member 90 interposed between the light reflecting member 30 and the surface protecting member 40. And the adhesive member 90 formed with the material which has a physical property different from the surface side filling member 61 is provided.

  According to this configuration, the light reflecting member 30 can be fixed to the surface protection member 40 by the adhesive member 90. Thereby, the light reflection member 30 can be arrange | positioned in the state which does not contact the photovoltaic cell 10. FIG. As a result, for example, even when the light reflecting member 30 or the solar battery cell 10 expands or contracts due to a change in environmental temperature, a state occurs in which one of the light reflecting member 30 and the solar battery cell 10 pushes or pulls the other. You can not let it. Therefore, the possibility of occurrence of damage to the solar battery cell 10 or the light reflecting member 30 due to interference between the solar battery cell 10 and the light reflecting member 30 is reduced.

  Moreover, the adhesive member 90 and the surface side filling member 61 are formed of materials having different physical properties. Therefore, for example, adjustment such as forming one of the adhesive member 90 and the front-side filling member 61 to be harder than the other is possible. Thereby, for example, when one of the adhesive member 90 and the surface side filling member 61 is about to be deformed, the influence on the other can be reduced.

  Thus, the solar cell module 1 according to the present embodiment is a solar cell module 1 that can effectively use incident light and that suppresses deterioration in performance.

  In the present embodiment, the MFR of the material of the adhesive member 90 is smaller than the MFR of the material of the surface-side filling member 61. Accordingly, for example, the adhesive member 90 is less likely to flow than the front-side filling member 61 in a high heat environment. Therefore, in a state where the light reflecting member 30 is disposed on the surface protection member 40 via the adhesive member 90, the surface protection member 40, the plurality of solar cells 10 (the plurality of strings 10S), and the like are disposed and laminated. In this case, it is difficult for the light reflecting member 30 to be displaced.

  In the present embodiment, the refractive index of the adhesive member 90 is larger than the refractive index of the surface protection member 40. Accordingly, as described with reference to FIG. 5, the light that enters the adhesive member 90 from the surface protection member 40 and is reflected by the light reflecting member 30 can be efficiently used for power generation.

  Moreover, in this Embodiment, the light reflection member 30 is arrange | positioned at the surface protection member 40 side of the area | region between the two adjacent photovoltaic cells 10 among the some photovoltaic cells 10. FIG.

  Here, when the solar cell module 1 does not include the light reflecting member 30, the light incident on the gap between the two adjacent solar cells 10 does not substantially contribute to power generation. That is, the gap between two adjacent solar cells 10 is an invalid area that does not contribute to power generation.

  However, in this Embodiment, the light reflection member 30 is arrange | positioned at the surface protection member 40 side of the clearance gap between the two adjacent photovoltaic cells 10. FIG. Thereby, the light which goes to this clearance gap can be reflected by the light reflection member 30, and can be guide | induced to the photovoltaic cell 10. FIG. That is, the light traveling toward the gap can be contributed to power generation.

  Further, as described above, the light reflecting member 30 is disposed without being in contact with the solar battery cell 10. Specifically, for example, as shown in FIG. 4, solar cells on both sides of the lower end portion of the light reflecting member 30 and the back surface protecting member 50 side of the light reflecting member 30 (hereinafter also referred to as “downward” for convenience of explanation). A gap through which light can pass is present between the cell 10 and the cell 10. Therefore, even if the light reflecting member 30 overlaps the end portion of the solar battery cell 10 in plan view, the incident path of light to the end portion of the solar battery cell 10 is blocked by the solar battery cell 10. Not.

  For example, the width W1 of the light reflecting member 30 and the gap W2 between the gaps between two adjacent solar cells 10 are the same (see FIG. 4), and two adjacent solar cells in plan view in design. Even when the light reflecting member 30 is aligned with the gap of the cell 10, the position of the light reflecting member 30 may be shifted due to, for example, aging. Even in this case, since there is a gap through which light can pass between the light reflecting member 30 and the solar cell 10 in the vicinity thereof, the light shielding amount by the light reflecting member 30 is suppressed.

  Note that the width W1 of the light reflecting member 30 and the gap W2 between the two adjacent solar cells 10 do not have to be the same. For example, it is assumed that there is an invalid region where no power is generated at the end of the solar battery cell 10 and the width of the invalid region in the Y-axis direction is wn. In this case, the width W1 of the light reflecting member 30 may be W2 + 2wn. In this case, the light reflecting member 30 is disposed so as to cover the invalid areas of the two adjacent solar cells 10, so that the light toward the invalid area can be reflected by the light reflecting member 30. As a result, the light traveling toward these invalid areas can be effectively used for power generation.

  In the present embodiment, a part of the surface-side filling member 61 is interposed between the light reflecting member 30 and the plurality of solar battery cells 10.

  Specifically, as described above, there is a gap through which light can pass between the light reflecting member 30 and the solar cells 10 on both sides below the light reflecting member 30, and the gap is on the surface side. It is filled with the filling member 61 (see FIG. 4). Further, the front side filling member 61 is made of, for example, EVA resin and has electrical insulation. Therefore, for example, even when the light reflecting member 30 is formed only of a metal such as aluminum (when the insulating member 31 is not provided), the surface-side filling member 61 includes the solar battery cell 10 and the light reflecting member. It can function as an insulating member between 30.

  Moreover, the manufacturing method of the solar cell module 1 which concerns on this Embodiment contains a sticking process, a filling member arrangement | positioning process, and a cell arrangement | positioning process. In the attaching step, the light reflecting member 30 is attached to the surface protection member 40 via the adhesive member 90. In the filling member arranging step, the surface side filling member 61 is arranged on the surface protection member 40 on the side where the light reflecting member 30 is affixed. In the cell arrangement step, the plurality of solar cells 10 are arranged on the surface-side filling member 61 on the side opposite to the surface protection member 40.

  According to this manufacturing method, the surface-side filling member 61 and the plurality of solar cells 10 are arranged in a state where the light reflecting member 30 is attached to the surface protection member 40. Therefore, for example, as described above, in the solar cell module 1, the light reflecting member 30 can be arranged without being in contact with the solar cell 10. Thereby, the possibility of occurrence of damage to the solar battery cell 10 or the light reflecting member 30 due to the interference between the solar battery cell 10 and the light reflecting member 30 is reduced. Therefore, according to the method for manufacturing solar cell module 1 according to the present embodiment, it is possible to manufacture solar cell module 1 in which incident light can be used effectively and performance deterioration is suppressed. .

(Other embodiments)
As mentioned above, although the solar cell module which concerns on this invention was demonstrated based on embodiment, this invention is not limited to the said embodiment.

  For example, in the above-described embodiment, the light reflecting member 30 is disposed on the surface protection member 40 side in the region between the two adjacent solar cells 10, but the position of the light reflecting member 30 is It is not limited to.

  For example, you may arrange | position the light reflection member 30 on the tab wiring 20 (for example, refer FIG. 1) arrange | positioned so that the photovoltaic cell 10 may be crossed in planar view.

  FIG. 8 is a cross-sectional view of the solar cell module 1 when the light reflecting member 30 a is arranged along the tab wiring 20. Specifically, FIG. 8 illustrates a cross section of the solar cell module 1 at a position corresponding to the line VIII-VIII in FIG.

  The tab wiring 20 is a wiring member that electrically connects two adjacent solar cells 10 in one string 10 </ b> S, and one end portion is disposed on one surface of the two adjacent solar cells 10. Is done. That is, when attention is paid to a certain solar battery cell 10, a part of the surface of the solar battery cell 10 is shielded by the tab wiring 20. Therefore, by disposing the light reflecting member 30a above the space, the space above the region (wiring member region) shielded by the wiring member in the solar battery cell 10 can be used effectively.

  The light reflecting member 30a has an insulating member 31a and a conductive light reflecting film 32a formed on the surface of the insulating member 31a. As shown in FIG. 8, the conductive light reflecting film 32a is short. It has an uneven shape in a cross section parallel to the direction (Y-axis direction). That is, the convex tip in the concavo-convex shape of the conductive light reflecting film 32a is continuous in the longitudinal direction (X-axis direction). Therefore, the light incident on the light reflecting member 30a is reflected toward the near side or the far side in FIG. 8, and is totally reflected at the outer interface of the surface protection member 40, for example, and is incident on the solar battery cell 10. .

  As described above, the solar cell module 1 illustrated in FIG. 8 includes the tab wiring 20 (wiring member) that electrically connects two adjacent solar cells 10 among the plurality of solar cells 10, and includes a light reflecting member. 30 is arranged on the surface protection member 40 side of the tab wiring 20.

  Thereby, the light which goes to the wiring member area | region of the photovoltaic cell 10 can be reflected in the light reflection member 30, As a result, the light is totally reflected in the outer interface of the surface protection member 40, for example, and a solar cell It can be led to the cell 10. Even when the light reflecting member 30 is disposed above the wiring member such as the tab wiring 20, the light reflecting member 30 is fixed to the surface protection member 40 by the adhesive member 90. It can be prevented from interfering (not contacting) with a wiring member such as the tab wiring 20.

  In FIG. 8, one light reflecting member 30 is disposed so as to straddle two adjacent solar cells 10, but one or more light reflecting members 30 are provided in each of the plurality of solar cells 10. It may be arranged. Further, similarly to the solar cell module 1 according to the above embodiment, the light reflecting member 30 is arranged corresponding to the region between two solar cells 10 adjacent in the Y-axis direction, and as shown in FIG. Moreover, the light reflecting member 30 may be disposed corresponding to the wiring member region of each solar battery cell 10.

  In the present embodiment, the adhesive member 90 and the surface-side filling member 61 are formed of materials having different physical properties. As an example, the MFR of the material of the adhesive member 90 is the material of the surface-side filling member 61. Smaller than the MFR. However, the physical properties of the material of the adhesive member 90 and the physical properties of the material of the surface-side filling member 61 may be distinguished, for example, depending on whether or not they have crosslinkability.

  For example, a non-crosslinked resin may be employed as the material of the adhesive member 90 and a crosslinked resin may be employed as the material of the surface side filling member 61. In this case, for example, when the solar cell module 1 is used, even when the adhesive member 90 becomes soft due to a high environmental temperature, the surface-side filling member 61 formed of a cross-linked resin is present around the surface. Thereby, the position shift of the light reflection member 30 is suppressed.

  In the present embodiment, for example, as shown in FIG. 4, the light reflecting member 30 is disposed away from the surface protection member 40, but the light reflecting member 30 is, for example, a conductive light reflecting film 32. The convex tip of the concavo-convex shape may be arranged so as to contact the surface protection member 40. Even in this case, the concave portion (the valley portion) of the concavo-convex shape of the conductive light reflecting film 32 of the light reflecting member 30 is filled with the adhesive member 90, so that it enters the light reflecting member 30. The reflected light can be reflected efficiently.

  Moreover, in the said embodiment, although the light reflection member 30 was provided so that it might respond | correspond to all the photovoltaic cells 10, you may provide only with respect to some photovoltaic cells 10. FIG. Even in this case, effective utilization of light incident on the solar cell module 1 is achieved by the one or more light reflecting members 30 provided only for some of the solar cells 10.

  Moreover, in the said embodiment, although the light reflection member 30 was provided for every clearance gap between the photovoltaic cells 10 adjacent in the transversal direction of the string 10S in the clearance gap between the two adjacent strings 10S, this. It is not limited to. For example, the light reflecting member 30 may be provided across a plurality of solar cells 10 along the longitudinal direction of the string 10S in the gap between two adjacent strings 10S.

  Further, in one string 10S, the light reflecting member 30 may be provided above a region between two solar cells 10 adjacent in the longitudinal direction of the string 10S. In this case, the light reflecting member 30 is disposed so as to straddle the plurality of tab wirings 20 in a plan view. However, since the light reflecting member 30 is fixed to the surface protection member 40, the light reflecting member 30 includes The tab wiring 20 can be disposed without contacting.

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

  Moreover, in the said embodiment, although the solar cell module 1 was the single-sided light reception system which uses only the surface protection member 40 as a light-receiving surface, the double-sided light reception which uses both the surface protection member 40 and the back surface protection member 50 as a light-receiving surface. It may be a method.

  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.

DESCRIPTION OF SYMBOLS 1 Solar cell module 10 Solar cell 20 Tab wiring (wiring member)
30, 30a Light reflecting member 40 Surface protection member 61 Surface side filling member (first filling member)
90 Adhesive member (second filling member)

Claims (7)

A plurality of solar cells arranged in at least one row;
A surface protection member disposed on the surface side of the plurality of solar cells;
A first filling member disposed between the plurality of solar cells and the surface protection member;
A light reflecting member disposed at a position closer to the surface protection member than the plurality of solar cells;
A solar cell module comprising: a second filling member interposed between the light reflecting member and the surface protection member, the second filling member formed of a material having physical properties different from those of the first filling member. The solar cell module according to claim 1, wherein a melt flow rate (MFR) of a material of the second filling member is smaller than an MFR of a material of the first filling member. The solar cell module according to claim 1 or 2, wherein a refractive index of the second filling member is larger than a refractive index of the surface protection member. The said light reflection member is arrange | positioned at the said surface protection member side of the area | region between two adjacent photovoltaic cells among these several photovoltaic cells. Solar cell module. The light reflecting member includes a wiring member that electrically connects two adjacent solar cells among the plurality of solar cells,
The solar cell module according to claim 1, wherein the light reflecting member is disposed on the surface protection member side of the wiring member. The solar cell module according to any one of claims 1 to 5, wherein a part of the first filling member is interposed between the light reflecting member and the plurality of solar cells. A sticking step of sticking the light reflecting member to the surface protection member via the adhesive member;
A filling member disposing step of disposing a filling member on the surface protection member on the side where the light reflecting member is affixed;
A cell disposing step of disposing a plurality of solar cells on the opposite side of the filling member from the surface protecting member;
The manufacturing method of the solar cell module containing this.

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