JP2013254992A - Photovoltaic element module and method for manufacturing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a photovoltaic element module having high reliability, high designability, and excellent power generation output and a method for manufacturing the element.SOLUTION: A module seals an array, in which a plurality of photovoltaic elements are arranged apart from one another substantially on one face, between a front face material which is installed on the front face side and has optical transparency and a back face material installed on the back face side; where the photovoltaic elements are double-sided power generation type elements, and the back face material has optical transparency. Recess lines are formed by a plurality of parallel wedge-shaped ditches formed linearly or convex lines formed in a shape obtained by arranging a plurality of convex parts in triangular prism shapes in parallel, on surfaces of the front face material and back face material having optical transparency in an area corresponding to at least a plurality of gaps between the double-sided power generation type photovoltaic elements; where an extension direction of the recess lines or convex lines on the surface of the front face material is different from that of the recess lines or convex lines on the surface of the back face material having optical transparency in the plane direction of a light-receiving face of the module.

Description

  The present invention relates to a photovoltaic element module and a manufacturing method thereof.

  In order to improve weather resistance, the photovoltaic element is generally used in the state of a module sealed with resin or transparent glass. At this time, a gap is often provided between the photovoltaic elements because of the ease of arrangement of the photovoltaic elements and electrical wiring. For this reason, the gap portion between the photovoltaic elements is a portion where the light incident on the light receiving surface of the photovoltaic element module does not reach the light receiving surface of the photovoltaic element. And the light which injected into the clearance gap between such photovoltaic elements is not absorbed by the photovoltaic element, but does not contribute to power generation and is wasted.

  Therefore, a material with high light reflectance is arranged on the back side of the module, and the light incident on the part where there is no photovoltaic element (non-power generation region) is reflected to the light receiving surface side in the module, and the glass surface on the light receiving surface side is reflected. Techniques for improving power generation output by re-reflecting and making it incident on a photovoltaic element have been disclosed (see, for example, Patent Document 1, Patent Document 2, and Patent Document 3).

  Reflected light, refracted light, or diffracted light from the inside of the module to the light receiving surface is 0 degrees in the direction perpendicular to the light receiving surface, and the light incident surface of the module is an angle that satisfies the following formula (1) (critical angle) θ or more. Must be incident on the interface between the air and the atmosphere (hereinafter abbreviated as module-atmosphere interface).

  In a module with a flat surface, among the light that reaches the module surface after being reflected, refracted, or diffracted in the module, the amount of light component at which the incident light on the module surface exceeds the above angle (critical angle) is increased. Thereby, the efficiency (light guide efficiency) which guide | induces the light which entered between cells to a photovoltaic device can be improved, and, thereby, the solar cell element module excellent in the electric power generation output can be obtained.

  Therefore, in such a light guide path using reflection at the module-atmosphere interface, in order to perform efficient light guide, in a non-power generation region so that the angle distribution is as small as possible and a specific emission angle is obtained. It is important to guide the incident light to the module-atmosphere interface. A reflector is suitable as an optical element that needs to keep the angular distribution of light small. Furthermore, the light incident on the reflector is divided into a specular reflection component emitted at the same angle as the incident angle, a diffusion component emitted at an intensity equal to all angles, and a haze component other than these, As described above, the reflector that can easily control the incident angle to the module-atmosphere interface and can maximize the amount of light component above the critical angle is the specularly reflected light (the output angle of the reflected light is It is made of a material having a high ratio of light having the same angle as the incident angle.

  For this reason, in Examples of Patent Document 1 and Patent Document 2, a metal which is a reflector having high regular reflection (or specular reflection) property is used. When such a highly specular reflector is used, in order to guide light from the non-power generation region to the photovoltaic element by the reflector, the light reflected by the reflector is above the critical angle to the module-atmosphere interface. The reflection surface formed by the reflector must be formed at an angle of a certain level or more with respect to the module-atmosphere interface so that the incident angle is an angle. At the same time, it is important for efficient light guide that the surface that forms the reflecting surface to face the photovoltaic element. Further, in order to further improve the light guide efficiency, it is used for actual power generation. It is known that the reflecting surface should be oriented in the north-south direction. For this reason, in Patent Document 1, in order to capture more light, the light reflector is disposed so as to surround the periphery of the photovoltaic element, and in Patent Document 2, the light reflecting slope is disposed so as to face the north-south direction. It was.

Japanese translation of PCT publication No. 2002-513210 JP 2002-43600 A JP 2005-209957 A

  However, when the light reflector is to be disposed so as to surround the periphery of the photovoltaic element as in Patent Document 1, the light reflector is interposed between the photovoltaic elements when the sealing material is softened and sealed. Since it is necessary to arrange and positioning is performed in a state where a plurality of cells are connected for electrical connection, an increase in the cell damage rate due to a large moment, an increase in cost due to the introduction of positioning equipment, etc. There were problems such as an increase in manufacturing time.

  With respect to such a problem, in Patent Document 2, a large gain is obtained by arranging the surface of the light reflector so as to face in the north-south direction (the ridgeline and groove formed by the reflecting surface are directed in the east-west direction). Is disclosed. However, in general, the photovoltaic module has a rectangular shape, and the direction in which the produced photovoltaic element module is installed is limited by the size of the roof of the installation location. There is a problem that the reflecting surface cannot face north-south.

  Also, when using a metal with high regular reflection as the reflector, the emission angle distribution of the reflected light is small due to the high regular reflection, so the illuminance at the emission angle equal to the incident angle of the light to the reflector is the distance However, there is a problem that the decrease in illuminance is small even when the number of light sources increases, and when there is an observer near the photovoltaic element module, the eyes are dazzled. In particular, when the glass surface is uneven, the light reflectance on the module surface is reduced, the antiglare property on the module surface is improved, and the power generation output can be increased. Reflected light from the reflector is likely to be emitted from the module glass-atmosphere interface, resulting in a problem that the improvement in power generation output due to light guide from the reflector is reduced and the human eye is more dazzled. On the other hand, in the case of reflection by a light scatterer, the illuminance decreases as the distance from the reflector increases, so the module is installed on the roof of the house and is separated from the scatterer by a certain distance. Then, the above problems did not occur.

  Reflected light from a reflector with a large proportion of specularly reflected light has a small emission angle distribution of light intensity. Therefore, in order to efficiently guide the light from the sun to the photovoltaic device, the reflecting surface faces in the east-west direction. It is better to face in the north-south direction. However, for example, when a reflector formed with a slope of 30 degrees with respect to the module surface is used, the incident light is incident up to about 20 degrees from the normal direction of the module surface toward the slope direction of the reflector. Only light can be guided effectively, and it cannot follow the change in the incident angle of sunlight due to the earth's earth axis tilt, revolution, and rotation. Due to the inclination of the earth's axis, the fluctuation of the incident angle is about 47 degrees per year.

  Further, in order to guide light from the non-power generation region to the photovoltaic element by the reflector, the surface on which the reflector is formed needs to face the direction of the photovoltaic element. Moreover, when it is going to arrange | position a reflector so that the circumference | surroundings of a photovoltaic device may be enclosed like patent document 1, the installation etc. for arrangement | positioning were needed and there existed a problem that cost increased.

  To solve such a problem, when a step-like reflector is used and one of its surfaces is constituted by a light absorber as in Patent Document 3, or when the reflector pieces are arranged in parallel to make the module back surface black, There has been a problem that the light guide efficiency from the reflector to the photovoltaic device is lowered, for example, because the absorber or the black part absorbs light.

  In the single-sided light receiving power module, there is a method of increasing the power generation output by guiding the light incident on the non-power generation region into the photovoltaic element by using a light scattering white particle pigment on the back side of the photovoltaic element. It is used. However, most of the light guiding from the non-power generation region to the photovoltaic element unit is caused by the light reflected by the non-power generation region being re-reflected at the glass-air interface and entering the photovoltaic element unit. . For this reason, the reflected light on the back surface of the module needs to be incident at an angle equal to or greater than the angle (critical angle) at which reflection occurs at the glass-air interface.

  However, as described above, in the method using a material such as a pigment that scatters light as a reflective material on the back surface side of the photovoltaic element, the reflected light becomes diffuse light, and the reflected light is reflected by the reflected light at the exit angle of the reflected light intensity. Intensity distribution occurs. Since the amount of light with which the incident angle of light on the glass-air interface exceeds the critical angle increases, the proportion of the light guided to the photovoltaic element decreases, while it is emitted outside the module to emit light. Since it is not absorbed by the electromotive force element, the proportion of light that does not contribute to power generation and is wasted increases.

  Further, the portion using the light-scattering white particle pigment has a problem that the appearance is different from the photovoltaic element part because the reflectance is greatly different from that of the photovoltaic element part, and the design is low.

  On the other hand, in the double-sided power generation module that ensures light transmission on both sides of the photovoltaic module and allows light incidence from both sides, both the first main surface and the second main surface are transparent. There is a problem that light is transmitted through a region other than the region where the electromotive force element is disposed and does not contribute to power generation.

  This invention is made | formed in view of the above, Comprising: While having high reliability and high designability, it aims at obtaining the photovoltaic device module excellent in the electric power generation output, and its manufacturing method.

  In order to solve the above-described problems and achieve the object, a photovoltaic element module according to the present invention includes a photovoltaic element array in which a plurality of photovoltaic elements are spaced apart from each other and disposed substantially on one surface. A photovoltaic device module sealed between a light-transmitting surface material provided on the front surface side of the photovoltaic device array and a back material provided on the back surface side of the photovoltaic device array. The photovoltaic element is a double-sided power generation type, the back material is a back material having light transparency, and at least in the region corresponding to the plurality of double-sided power generation type photovoltaic elements, the surface material and Concave lines are formed on the surface of the light-transmitting back material by a plurality of parallel wedge-shaped grooves each formed in a linear shape, or a plurality of triangular prism-shaped convex portions are arranged in parallel. A line is formed and the light In the planar direction of the light receiving surface of the power element module, the extending direction of the concave line or the convex line on the surface of the surface material is different from the extending direction of the concave line or the convex line on the surface of the back material having light transmittance. It is characterized by this.

  According to the present invention, there is an effect that it is possible to obtain a photovoltaic element module having high reliability and high design property and excellent in power generation output.

1-1 is a principal part perspective view showing the configuration of the solar cell module according to Embodiment 1 of the present invention. FIG. 1-2 is principal part sectional drawing which shows the structure of the solar cell module concerning Embodiment 1 of this invention. FIGS. 2-1 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 1 of this invention. FIGS. FIGS. 2-2 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 1 of this invention. FIGS. FIGS. 2-3 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 1 of this invention. FIGS. FIG. 3-1 is a main part perspective view showing the configuration of the solar cell module according to the second embodiment of the present invention. 3-2 is principal part sectional drawing which shows the structure of the solar cell module concerning Embodiment 2 of this invention. FIGS. 4-1 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 2 of this invention. FIGS. FIGS. 4-2 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 2 of this invention. FIGS. 4-3 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 2 of this invention. FIGS. 5-1 is a principal part perspective view which shows the structure of the solar cell module concerning Embodiment 3 of this invention. FIGS. 5-2 is principal part sectional drawing which shows the structure of the solar cell module concerning Embodiment 3 of this invention. FIGS. 6-1 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 3 of this invention. FIGS. 6-2 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 3 of this invention. 6-3 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 3 of this invention. 7-1 is sectional drawing which shows the structure of the solar cell module which is a photovoltaic element module concerning Embodiment 4 of this invention. FIG. 7-2 is a plan view of the photovoltaic element module according to the fourth embodiment of the present invention as viewed from the light receiving surface side. FIG. 7-3 is a perspective view of relevant parts for explaining the configuration of the light reflector according to the fourth embodiment. FIG. 8-1 is a main part perspective view showing the configuration of the solar cell module according to Embodiment 5 of the present invention. 8-2 is principal part sectional drawing which shows the structure of the solar cell module concerning Embodiment 5 of this invention. FIG. 8-3 is a schematic diagram illustrating a cross-sectional structure on the light-receiving surface side of the solar cell module according to Embodiment 5 of the present invention. FIGS. 9-1 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 5 of this invention. FIGS. FIGS. 9-2 is principal part sectional drawing explaining an example of the preparation methods of the solar cell module concerning Embodiment 5 of this invention. FIGS. 9-3 is principal part sectional drawing explaining an example of the manufacturing method of the solar cell module concerning Embodiment 5 of this invention.

  Embodiments of a photovoltaic element module and a method for manufacturing the same according to the present invention will be described below in detail with reference to the drawings. In addition, this invention is not limited to the following description, In the range which does not deviate from the summary of this invention, it can change suitably. In the drawings shown below, the scale of each member may be different from the actual scale for easy understanding. The same applies between the drawings.

Embodiment 1 FIG.
1-1 is a main part perspective view showing a configuration of a solar cell module which is a photovoltaic element module according to Embodiment 1 of the present invention. FIG. FIGS. 1-2 is principal part sectional drawing which shows the structure of the solar cell module which is a photovoltaic element module concerning Embodiment 1 of this invention, and is AA sectional drawing in FIGS. 1-1. The solar cell module according to Embodiment 1 includes a transparent support 1, a solar cell element 2, a weather resistant resin film 3, a sealing resin 4, an inter-element connection line 5, and a light reflector 6.

  As the transparent support 1, a light-transmitting material such as transparent glass is used, and for example, a plate-like plate glass whose in-plane shape is a substantially square shape can be used. As the solar cell element 2, for example, a crystalline silicon solar cell such as a polycrystalline silicon solar cell can be used. Moreover, the solar cell element 2 comprises a solar cell element array in which a plurality of elements are separated from each other and provided on substantially one surface.

  As the weather resistant resin film 3, for example, a weather resistant polyethylene terephthalate resin or a polyethylene terephthalate resin kneaded with a white pigment as a reflector can be used. As the sealing resin 4, for example, a transparent sealing material can be used in a wavelength region where light absorption of a photovoltaic element such as ethylene vinyl acetate resin (EVA) is strong. For example, a copper wire can be used as the inter-element connection line 5. As the light reflector 6, for example, a metal foil such as an aluminum foil having light reflectivity, a vapor-deposited aluminum film, or the like can be used.

  The light reflector 6 having a high regular reflection property is set so that the incident angle θ of the light reflected from the light reflector 6 to the glass is not less than an angle (critical angle) satisfying the condition of the following formula (3). By forming an inclined surface (light reflecting surface) so as to have an angle of a certain angle or more than θ / 2 with respect to the light receiving surface of the solar cell module, it is perpendicularly incident on a region other than the region of the solar cell element 2. Thus, the light reaching the back surface of the solar cell module is reflected and guided to the solar cell element 2, so that a solar cell module excellent in power generation output can be obtained. Therefore, the light reflector 6 is mainly configured by a light reflecting surface that forms an angle equal to or larger than the angle α shown in the following mathematical formula (4) with the light receiving surface of the solar cell module.

  For example, when the surface of the solar cell module is made of general glass, since the refractive index of the surface of the solar cell module is about 1.5, the critical angle is 42 degrees, which is an efficient light guide. Therefore, the angle formed by the inclined surface of the light reflector 6 with the surface of the solar cell module needs to be 21 degrees or more. When an antireflection film or the like is applied to the glass surface, the angle formed by the inclined surface (light reflecting surface) of the light reflector 6 and the surface of the solar cell module needs to be increased according to the refractive index.

  On the other hand, the light reflected by the light reflector 6 having an angle α or more represented by the above formula (4) with respect to the light receiving surface is reflected at the glass-atmosphere interface and guided parallel to the light receiving surface. However, the greater the angle between the surface of the solar cell module and the inclined surface (light reflecting surface) of the light reflector 6, the more the light is angled in a direction parallel to the light receiving surface. It becomes long and is easily guided to the solar cell element 2. On the other hand, if the angle formed between the surface of the solar cell module and the inclined surface (light reflecting surface) of the light reflector 6 becomes too large, the angle between the adjacent inclined surfaces (light reflecting surface) of the light reflector 6 is increased. The light is multiple-reflected, the incident angle θ of the reflected light from the light reflector 6 to the glass-atmosphere interface is increased, and the reflected light is emitted from the glass, so that the light guide efficiency is lowered.

  For this reason, as already shown in Patent Document 1, the light reflector 6 is set so as to form an angle of about 30 degrees with respect to the light receiving surface, so that the light vertically incident on the surface of the solar cell module is obtained. This increases the light guide distance in the direction parallel to the light receiving surface, and is particularly preferable for improving the power generation output.

  Further, as the surface shape of the transparent support 1, the module is designed to increase the transparency of light incident from the sun to the module surface-atmosphere interface, to increase the antiglare property at the module surface-atmosphere interface, and to increase the power generation output. It is preferable to use the surface glass with irregularities as the light incident side transparent material. For this purpose, it is possible to use a transparent support 1 having a random surface with irregularities.

  In the solar cell module according to the first embodiment configured as described above, the light reflector 6 made of aluminum having light reflectivity is used as the weather resistant resin film 3 and the sealing resin 4 on the back surface of the solar cell module. Prepare in between. Here, the surface shape of the light reflector 6 is such that a plurality of triangular prism-like convex lines are arranged in parallel with a pair of opposite sides in the in-plane direction of the solar cell module in which the light receiving surface shape is substantially rectangular. It is a shape, and is mainly composed of a light receiving surface of the solar cell module and an inclined surface (light reflecting surface) that forms an angle equal to or greater than a certain angle α shown in the above formula (4). Thereby, the light incident on the non-power generation region between the adjacent solar cell elements 2 is reflected to the surface of the solar cell module by the light reflector 6 so as to be an angle larger than the critical angle of the module-air interface, This reflected light can be reflected at the module-air interface and guided to the solar cell element 2. Therefore, in the solar cell module according to the first embodiment, the light incident on the non-power generation region can be reincident on the solar cell element 2 to increase the light use efficiency, and the solar power generation output can be increased. A battery module is realized.

  In addition, the unevenness | corrugation in the surface of the light reflector 6 is small compared with the size of the planar direction of the light reflector 6, and it is preferable that the root mean square roughness is a size of 10 millimeters or less and 1000 nanometers or more. When this root mean square roughness is less than 1000 nanometers, the surface irregularities become the same as the wavelength of light, and the regular reflection due to the surface irregularities decreases. Moreover, when the root mean square roughness is larger than 10 millimeters, productivity is deteriorated.

  Moreover, in general light guide from the non-power generation region to the power generation region by light scattering, most of the light reflected from the non-power generation region is incident on the module surface-atmosphere interface at an angle less than the critical angle. These lights were emitted from the glass into the atmosphere and looked white. In particular, in order to increase the transmittance of light with a large incident angle among the light incident on the module surface-atmosphere interface from the sun, and to increase the antiglare property at the module surface-atmosphere interface, the glass on the module surface is made uneven. Is used as a transparent material on the light incident side, most of the light incident on the module surface-atmosphere interface at an angle greater than the critical angle with respect to a plane parallel to the glass surface. It was transmitted without reflecting, and did not contribute to the current. On the other hand, in the solar cell module according to the first embodiment, most of the light incident on the non-power generation region between the solar cell elements 2 is reflected from the transparent support 1-atmosphere interface so that the light from the transparent support 1 Therefore, the non-power generation area where the light reflector 6 is located looks dark. Thereby, the color of the non-power generation region can be made closer to the color of the solar cell element generally similar to black, and a solar cell module excellent in design is realized. This also increases the antiglare property.

  In addition, the unevenness | corrugation in the surface of the transparent support body 1 is small compared with the size of the planar direction of the transparent support body 1, and it is preferable that the arithmetic mean roughness is a size of 10 millimeters or less and 1000 nanometers or more. When the arithmetic average roughness is less than 1000 nanometers, the unevenness of the surface becomes smaller than the wavelength of light, and the reflectivity with respect to the incident angle of the light to the plane constituting the unevenness of the surface is lowered. Moreover, when the arithmetic average roughness is larger than 10 millimeters, the productivity is deteriorated.

  In particular, the light incident side shape of the transparent support 1 may be a random uneven shape, and such unevenness reduces light reflection on the surface of the transparent support 1 with respect to the incident light from the sun, and is antiglare. Can be increased. On the other hand, the unevenness of the surface improves the transmittance of light with a large incident angle at the module surface-atmosphere interface, improves the power generation output, and easily transmits light incident from the inside of the module to the module surface-atmosphere interface. Therefore, even if the light incident on the non-power generation region is reflected on the back surface of the module, it is difficult to be reflected on the module surface side, so that the light incident on the non-power generation region cannot be effectively guided to the solar cell element 2 and is output. It cannot be changed. This problem is reduced by reducing the angle of the inclined surface constituting the back reflecting surface with respect to the normal to the module plane. The shape of the transparent support 1 on the light incident side is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface, and the direction of the wedge-shaped groove (the extending direction of the triangular prism-like convex lines) is light. Even when the reflector 6 is arranged so as to be approximately 90 degrees with the groove direction of the reflector 6 (the extending direction of the triangular prism-like convex line), the incident angle of light incident on the module surface-atmosphere interface is critical. It is possible to keep the state larger than the angle, re-reflect light at the module surface-atmosphere interface, contribute to power generation, and increase the power generation output. Note that the angle formed between the extending direction of the triangular prismatic convex lines of the transparent support 1 and the extending direction of the triangular prismatic convex lines of the light reflector 6 is not necessarily 90 degrees.

  Further, in the solar cell module according to the first embodiment, since the light incident on the non-power generation region can be re-incident on the solar cell element 2 to increase the light use efficiency, By increasing the area ratio, the power generation output can be increased without increasing the area of the solar cell element 2. In this case, the non-power generation area can be made wider depending on the purpose.

  Further, in the solar cell module according to the first embodiment, when glass is used for the transparent support 1 and a material having a refractive index different from that of glass is used as the sealing resin 4, light is also emitted at the glass-sealing resin interface. Confinement is possible. Moreover, in the above, although the structure which seals a photovoltaic element with glass, resin, and a resin film was assumed, a reflector may be formed in the back using glass instead of a back resin film, The material is not limited only to that used in the above embodiment.

  Therefore, according to the solar cell module according to the first embodiment, the light incident on the non-power generation region where the solar cell element 2 does not exist can be effectively guided to the solar cell element 2, and has high reliability and high designability. And a solar cell module excellent in power generation output.

  The solar cell module manufacturing method according to the first embodiment having the structure in which the light reflector 6 has the above-described angle formed with respect to the light receiving surface of the module as the solar cell element 2 is polycrystalline. A polycrystalline silicon solar battery module using silicon solar battery cells (hereinafter referred to as cell 2) will be described as an example with reference to FIGS. FIGS. 2-1 to 2-3 are cross-sectional views of relevant parts for explaining an example of a method for producing the solar cell module according to the first embodiment.

  First, in two cells 2, a conductor is passed as an inter-element connection line 5 between the front-side electrode of one cell 2 and the back-side electrode of the other cell 2 (between the negative electrode and the positive electrode). Is electrically connected to one cell 2 and the other cell 2. This electrical connection is made to a plurality of cells 2 so that all the cells 2 are connected in series, and the cells 2 are connected in a row in a row.

  Next, a sheet-like ethylene vinyl acetate resin (EVA) as the sealing resin 4 is formed on the plate-like transparent support 1 whose in-plane shape is substantially rectangular, for example, on a transparent glass substrate. Further, the plurality of cells 2 connected as described above are placed so that the light receiving surface is on the transparent glass substrate side (FIG. 2-1). Here, the surface shape of the transparent support 1 opposite to the sealing resin 4 is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel. Then, a plurality of triangular prism-like convex lines are formed in a shape extending substantially parallel to a pair of sides of the transparent support 1 facing each other in the in-plane direction of the transparent support 1.

  From this, another EVA sheet is mounted as the sealing resin 4, and the weather resistance is made into a substantially rectangular shape by adhering an aluminum foil as a light reflector 6 in which, for example, a triangular columnar convex line having a parallel surface is aligned. A weather-resistant polyethylene terephthalate film as the resin film 3 is placed so that the light reflector 6 is on the light receiving surface side (EVA side) (FIG. 2-2). Here, the surface shape on one surface side (light-receiving surface side) of the weather-resistant resin film 3 is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel, and the other surface side (back surface side) of the weather-resistant resin film 3. The surface of is flat. In addition, a plurality of triangular prism-like convex lines have a shape extending substantially in parallel with a pair of sides of the weather resistant resin film 3 facing in the in-plane direction of the weather resistant resin film 3. The surface on the one surface side (light-receiving surface side) of the weather-resistant resin film 3 is the same as the surface on the other surface side (back surface side) of the flat weather-resistant resin film 3 where the surfaces of the plurality of triangular prism-shaped convex lines are flat. It is formed so as to form an angle above a certain level.

  The light reflector 6 is formed along the surface shape on one surface side (light-receiving surface side) of the weather-resistant resin film 3, and is similar to the surface shape on one surface side (light-receiving surface side) of the weather-resistant resin film 3. A plurality of triangular prismatic convex lines are arranged in parallel. The uneven surface of the light reflector 6 is formed so as to form a certain angle or more with the surface on the other surface side (back surface side) of the flat weather-resistant resin film 3. When the weather resistant resin film 3 is placed on the EVA sheet, the groove direction (convex line direction) of the light reflector 6 is the groove direction (convex line direction) of the convex line formed on the transparent support 1. And are arranged so as to form approximately 90 degrees.

  Next, sandwich the laminate with a polytetrafluoroethylene film so that EVA overflowing from the side does not adhere (not shown), sandwich the entire laminate with a diaphragm, and heat to about 100 ° C. under reduced pressure. The sealant is softened and pressure is applied between the transparent glass substrate and the weather-resistant polyethylene terephthalate film to crimp the EVA sheet. Thereby, on the back side of the solar cell module, a structure in which the reflective film as the light reflector 6 forms an angle of a certain angle or more with respect to the light receiving surface of the solar cell module can be formed (FIG. 2-3). . In addition, although the case where the light reflector 6 was previously bonded to the light-receiving surface side surface of the weather resistant resin film 3 was described here, for example, an aluminum foil or the like on another EVA sheet as the sealing resin 4 The light reflecting body 6 and the weather resistant resin film 3 having the above-mentioned uneven surface shape are placed in this order. In this state, the light reflecting body 6 and the uneven surface shape of the weather resistant resin film 3 are You may make it the same shape.

  In the manufacturing method of the solar cell module according to the first embodiment as described above, the light reflector 6 having light reflectivity is disposed between the weather resistant resin film 3 and the sealing resin 4 on the back surface of the solar cell module. Form. Here, the light reflector 6 is mainly configured by a light-receiving surface of the solar cell module and an inclined surface (light reflecting surface) that forms an angle equal to or greater than a certain angle α shown in the above formula (4). Thereby, the light incident on the non-power generation region between the adjacent solar cell elements 2 is reflected to the surface of the solar cell module by the light reflector 6 so as to be an angle larger than the critical angle of the module-air interface, This reflected light can be reflected at the module-air interface and guided to the solar cell element 2. Therefore, according to the method for manufacturing the solar cell module according to the first embodiment, light incident on the non-power generation region of the solar cell module can be reincident on the solar cell element 2 to increase the light utilization efficiency, A solar cell module with increased output can be manufactured.

  Further, in the light guide from the non-power generation region to the power generation region by light scattering that is generally used, the light is emitted from the glass to the atmosphere and looks white. On the other hand, in the method for manufacturing the solar cell module according to the first embodiment, the light incident on the non-power generation region between the solar cell elements 2 is reflected at the transparent support 1-atmosphere interface, and the transparent support 1 Therefore, the non-power generation area where the light reflector 6 is located looks dark. Therefore, according to the manufacturing method of the solar cell module according to the first embodiment, the color of the non-power generation region can be made closer to a solar cell element generally similar to black, and is excellent in design. A solar cell module can be produced. Moreover, being excellent in design improves the antiglare property at the same time.

  In particular, the light incident side of the transparent support 1 has a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface, thereby reducing light reflection on the surface of the transparent support 1 and anti-glare. Can increase the sex. In addition, the light incident side of the transparent support 1 has a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface, thereby improving the transmittance of light with a large incident angle at the module surface-atmosphere interface. By arranging the groove direction (extending direction of the triangular prism-shaped convex line) to be approximately 90 degrees with the groove direction of the light reflector 6 (extending direction of the triangular prism-shaped convex line), the back surface The incident angle of light incident on the module surface-atmosphere interface after being reflected by the light can be kept larger than the critical angle, and the light can be re-reflected at the module surface-atmosphere interface to contribute to power generation. The output can be increased.

  Moreover, in the manufacturing method of the solar cell module according to the first embodiment, the power generation output is increased without increasing the area of the solar cell element 2 by increasing the area ratio of the non-power generation region to the solar cell element 2. There is also an effect that can be done. In this case, the non-power generation area can be made wider depending on the purpose.

  Moreover, in the manufacturing method of the solar cell module concerning Embodiment 1, when glass is used for the transparent support body 1 and the material from which refractive index differs from glass as the sealing resin 4, it is glass-sealing resin. Light confinement is possible even at the interface.

  Therefore, according to the manufacturing method of the solar cell module according to the first embodiment, the light incident on the non-power generation region where the solar cell element 2 does not exist can be guided to the solar cell element 2, and has high reliability and high design properties. And a solar cell module excellent in power generation output.

Embodiment 2. FIG.
FIG. 3-1 is a main part perspective view showing the configuration of the solar cell module according to the second embodiment of the present invention. 3-2 is principal part sectional drawing which shows the structure of the solar cell module concerning Embodiment 2 of this invention, and is BB sectional drawing in FIGS. 3-1. The solar cell module according to Embodiment 2 includes a transparent support 1, a solar cell element 2, a weather resistant resin film 3, a sealing resin 4, an inter-element connection line 5, and a light reflector 16.

  As the transparent support 1, a material having optical transparency such as transparent glass is used. For example, a plate glass having a refractive index of about 1.5 can be used. As the solar cell element 2, for example, a crystalline silicon solar cell such as a polycrystalline silicon solar cell can be used. As the weather resistant resin film 3, for example, a transparent polyethylene terephthalate resin or a polyethylene terephthalate resin in which a white pigment is kneaded as a reflector can be used. As the sealing resin 4, for example, ethylene vinyl acetate (EVA) having a refractive index of about 1.5 can be used. For example, a copper wire can be used as the inter-element connection line 5.

  As the light reflector 16, for example, a metal foil such as an aluminum foil can be used as a light reflector having specular reflectivity. Here, light reflection with high specular reflection is performed so that the incident angle θ of the light reflected from the light reflector 16 to the glass is not less than an angle (critical angle) satisfying the condition of the above formula (3). The body 16 is incident on a region other than the region of the solar cell element 2 by forming an inclined surface (light reflecting surface) so as to have a certain angle or more than θ / 2 with respect to the light receiving surface of the solar cell module. Then, the light reaching the back surface of the solar cell module is reflected and guided to the solar cell element 2, and a solar cell module excellent in power generation output can be obtained. Therefore, the light reflector 16 is mainly constituted by a light receiving surface of the solar cell module and a slope (light reflecting surface) that forms an angle equal to or larger than the certain angle α shown in the above mathematical formula (4).

  The thickness of the solar cell element 2 is about 300 nm to 500 μm, and the thickness of the sealing resin 4 that seals the solar cell element 2 is generally about 100 μm to several millimeters.

  In the solar cell module according to the second embodiment configured as described above, the light reflector 16 is provided between the weather resistant resin film 3 and the sealing resin 4 on the back surface of the solar cell module. Here, the surface shape of the light reflector 16 is a pair in which a plurality of substantially triangular prism-like convex lines having two curved surfaces oppose each other in the in-plane direction of the solar cell module whose light-receiving surface shape is a substantially square shape. And is mainly composed of a light receiving surface of the solar cell module and an inclined surface (light reflecting surface) that forms an angle equal to or larger than a certain angle α shown in the above formula (4). Thereby, the light incident on the non-power generation region between the adjacent solar cell elements 2 is reflected to the surface of the solar cell module by the light reflector 16 so as to be an angle larger than the critical angle of the module-air interface, This reflected light can be reflected at the module-air interface and guided to the solar cell element 2. Therefore, in the solar cell module according to the second embodiment, the light incident on the non-power generation region can be reincident on the solar cell element 2 to increase the light utilization efficiency, and the solar power generation output can be increased. A battery module is realized.

  In addition, the unevenness | corrugation in the surface of the light reflector 16 is small compared with the size of the planar direction of the light reflector 16, and it is preferable that the arithmetic mean roughness is a size of 10 millimeters or less and 1000 nanometers or more. When the arithmetic average roughness is less than 1000 nanometers, the surface unevenness becomes smaller than the wavelength of light, and the reflectivity due to the surface unevenness is lost. Moreover, when the root mean square roughness is larger than 10 millimeters, productivity is deteriorated.

  Further, in the solar cell module according to the second embodiment, by making the reflection surface of the light reflector 16 a curved surface, the distance from the light reflector 16 can be increased and the light illuminance can be lowered, thereby further improving the antiglare property. However, a high optical confinement structure can be obtained.

  Further, in the light guide from the non-power generation region to the power generation region by light scattering that is generally used, the light is emitted from the glass to the atmosphere and looks white. On the other hand, in the solar cell module according to the second embodiment, the angle dependency of the light reflection intensity can be kept relatively small by the curvature of the curved surface (reflection surface) of the light reflector 16, and as a result, the critical angle The light component incident on the transparent support 1-atmosphere interface at a smaller angle can be kept low, and light incident on the non-power generation region between the solar cell elements 2 is reflected at the transparent support 1-atmosphere interface. Thus, light is not emitted from the transparent support 1. For this reason, the non-power generation region where the light reflector 16 is present looks dark. Thereby, the color of the non-power generation region can be made closer to the color of the solar cell element generally similar to black, and a solar cell module excellent in design is realized. This also increases the antiglare property.

  In the solar cell module according to the second embodiment, since the light incident on the non-power generation region can be re-incident on the solar cell element 2 to increase the light use efficiency, the solar cell element 2 in the non-power generation region can be increased. By increasing the area ratio with respect to, the power generation output can be increased without increasing the area of the solar cell element 2. In this case, the non-power generation area can be made wider depending on the purpose.

  In the solar cell module according to the second embodiment, when glass is used for the transparent support 1 and a material having a refractive index different from that of glass is used as the sealing resin 4, light is emitted even at the glass-sealing resin interface. Confinement is possible.

  Therefore, according to the solar cell module according to the second embodiment, the light incident on the non-power generation region where the solar cell element 2 does not exist can be effectively guided to the solar cell element 2, and the power generation output and the design are excellent. A solar cell module is realized.

  The method for manufacturing a solar cell module according to the second embodiment as described above is illustrated by taking a polycrystalline silicon solar cell module using a polycrystalline silicon solar cell (hereinafter referred to as cell 2) as the solar cell element 2 as an example. A description will be given with reference to FIGS. FIGS. 4-1 to 4-3 are main part cross-sectional views illustrating an example of a method for manufacturing the solar cell module according to the second embodiment.

  First, in two cells 2, a conductor is passed as an inter-element connection line 5 between the front-side electrode of one cell 2 and the back-side electrode of the other cell 2 (between the negative electrode and the positive electrode). Is electrically connected to one cell 2 and the other cell 2. This electrical connection is made to a plurality of cells 2 so that all the cells 2 are connected in series, and the cells 2 are connected in a row in a row.

  A plurality of cells in which the EVA sheet as the sealing resin 4 is mounted on the transparent glass substrate as the plate-like transparent support 1 whose in-plane shape is substantially rectangular, and further connected as described above. 2 is placed so that the light receiving surface is on the transparent glass substrate side (FIG. 4A).

  From this, another EVA sheet is placed as the sealing resin 4, and an aluminum foil having a surface shape in which, for example, a plurality of substantially triangular prism-shaped convex lines with two sides curved is bonded as the light reflector 16. A weather-resistant polyethylene terephthalate film as the weather-resistant resin film 3 having a quadrangular shape is placed so that the light reflector 16 is on the light-receiving surface side (EVA side) (FIG. 4-2).

  Here, the surface shape on one surface side (light-receiving surface side) of the weather resistant resin film 3 is a shape in which a plurality of substantially triangular prism-shaped convex lines having two curved surfaces are arranged in parallel, and the weather resistant resin film 3 The surface on the other surface side (back surface side) is flat. Further, a plurality of substantially triangular prism-like convex lines having two curved surfaces are formed in a shape extending substantially parallel to a pair of sides of the weather resistant resin film 3 facing in the in-plane direction of the weather resistant resin film 3. The And the surface of one surface side (light-receiving surface side) of the weather resistant resin film 3 is the other surface of the flat weather resistant resin film 3 where the surfaces of a plurality of substantially triangular prism-shaped convex lines whose two sides are curved. It is formed so as to form a certain angle or more with the side (back side) surface.

  The light reflector 16 is formed along the surface shape on one surface side (light receiving surface side) of the weather resistant resin film 3, and is similar to the surface shape on one surface side (light receiving surface side) of the weather resistant resin film 3. A plurality of substantially triangular prism-shaped convex lines having two curved surfaces are arranged in parallel. The uneven surface of the light reflector 16 is formed so as to form an angle of a certain angle or more with the surface on the other surface side (back surface side) of the flat weather-resistant resin film 3.

  Next, the laminate in which each member is laminated is sandwiched between sheets of polytetrafluoroethylene (PTFE) (not shown), the entire laminate is sandwiched between diaphragms, heated to about 100 ° C. under reduced pressure, and sealed. The agent is softened and pressure is applied between the EVA sheet by applying pressure between the transparent glass substrate and the weather-resistant polyethylene terephthalate film. Thereby, on the back side of the solar cell module, a structure in which the reflective film as the light reflector 6 forms an angle of a certain angle or more with respect to the light receiving surface of the solar cell module can be formed (FIG. 4-3). .

  By forming a weather-resistant polyethylene terephthalate film in a concavo-convex shape with a curved surface so that the incident angle of the reflected light to the module-atmosphere interface is equal to or greater than the critical angle, the back side of the solar cell module and adjacent to it. A structure in which the light reflector 16 forms an angle of a certain angle or more with respect to the light receiving surface of the solar cell module can be formed between the cells 2. Here, the case where the light reflector 16 is bonded in advance to the light-receiving surface side surface of the weather resistant resin film 3 has been described, but for example, an aluminum foil or the like on another EVA sheet as the sealing resin 4 The light reflecting body 16 and the weather resistant resin film 3 having the above-described uneven surface shape are placed in this order. In this state, the light reflecting body 16 and the uneven surface shape of the weather resistant resin film 3 are You may make it the same shape.

  In the solar cell module manufacturing method according to the second embodiment as described above, the light reflector 16 is formed between the adjacent solar cell elements 2 and the sealing resin 4 on the back surface side of the solar cell module. Here, the light reflector 16 is mainly composed of a light-receiving surface of the solar cell module and an inclined surface (light reflecting surface) that forms an angle equal to or greater than a certain angle α shown in the above formula (4). Thereby, the light incident on the non-power generation region between the adjacent solar cell elements 2 is reflected to the surface of the solar cell module by the light reflector 16 so as to be an angle larger than the critical angle of the module-air interface, This reflected light can be reflected at the module-air interface and guided to the solar cell element 2. Therefore, according to the method for manufacturing a solar cell module according to the second embodiment, light incident on the non-power generation region of the solar cell module can be re-incident on the solar cell element 2 to increase the light use efficiency. A solar cell module with increased output can be manufactured.

  Moreover, in the manufacturing method of the solar cell module according to the second embodiment, by making the slope formed by the light reflector a curved surface, the emission angle distribution of the reflected light can be obtained even with the light reflected by the reflector having high regular reflection. Light that is reflected by the reflector, such as when the observation surface is far from the curved surface of the reflector and the illuminance decreases because the emission angle distribution is large while being within the critical angle range, and the illuminance decreases. However, even if there is a large amount of light that is transmitted without being reflected on the glass surface, it is possible to obtain a high light confinement structure while improving the antiglare property between adjacent solar cell modules.

  Further, in the light guide from the non-power generation region to the power generation region by light scattering that is generally used, the light is emitted from the glass to the atmosphere and looks white. On the other hand, in the method for manufacturing a solar cell module according to the second embodiment, the light that has entered the non-power generation region between the solar cell elements 2 is reflected at the transparent support 1-atmosphere interface, and the transparent support 1 Therefore, the non-power generation region where the light reflector 16 is located looks dark. Therefore, according to the method for manufacturing a solar cell module according to the second embodiment, the color of the non-power generation region can be made closer to a solar cell element generally similar to black, and is excellent in design. A solar cell module can be produced.

  In the method for manufacturing the solar cell module according to the second embodiment, the power generation output is increased without increasing the area of the solar cell element 2 by increasing the area ratio of the non-power generation region to the solar cell element 2. There is also an effect that can be done. In this case, the non-power generation area can be made wider depending on the purpose.

  Moreover, in the manufacturing method of the solar cell module concerning Embodiment 2, when glass is used for the transparent support body 1 and the material from which refractive index differs from glass as the sealing resin 4, it is glass-sealing resin. Light confinement is possible even at the interface.

  Therefore, according to the method for manufacturing the solar cell module according to the second embodiment, the light incident on the non-power generation region where the solar cell element 2 does not exist can be guided to the solar cell element 2, and the power generation output and the design are excellent. A solar cell module can be produced.

Embodiment 3 FIG.
FIGS. 5-1 is a principal part perspective view which shows the structure of the solar cell module concerning Embodiment 3 of this invention. FIGS. 5-2 is principal part sectional drawing which shows the structure of the solar cell module concerning Embodiment 3 of this invention, and is CC sectional drawing in FIGS. 5-1. The solar cell module shown in FIGS. 5-1 and 5-2 uses a double-sided power generation solar cell element as a solar cell element, ensures light transmission on both sides of the solar cell module, and emits light from both sides of the solar cell module. It is an example of the double-sided power generation solar cell module that enables incidence. That is, the solar cell module according to Embodiment 3 includes a transparent support 1, a solar cell element 12, a sealing resin 4, and an inter-element connection line 5.

  The shape on the light incident side of the transparent support 1 is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface as in the first embodiment. Thereby, the light reflection in the surface of the transparent support body 1 can be reduced, and anti-glare property can be improved. In addition, the shape on the light incident side of the sealing resin 4 on the back surface is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the front surface. Thereby, the light reflection in the surface of the sealing resin 4 can be reduced and anti-glare property can be improved.

  Here, the shape on the light incident side of the transparent support 1 is substantially parallel to a pair of sides facing each other in the in-plane direction of the solar cell module in which a plurality of triangular prism-shaped convex lines have a light-receiving surface shape of a substantially square shape. It is a shape lined up.

  As a result, the light incident on the non-power generation region between the adjacent solar cell elements 12 is made to be larger than the critical angle of the module-air interface by the sealing resin 4-air interface on the back surface of the solar cell module. Reflected to the surface, this reflected light can be reflected at the module-air interface.

  Similarly, the shape of the back surface of the sealing resin 4 on the light incident side is such that a plurality of triangular prism-like convex lines are opposed to each other in the in-plane direction of the solar cell module in which the light receiving surface has a substantially rectangular shape. The shape is arranged in parallel.

  As a result, the light incident on the non-power generation region between the adjacent solar cell elements 12 is sunlit by the transparent support 1-air interface so that the angle becomes larger than the critical angle of the sealing resin 4-air interface on the back surface. It is reflected to the back surface of the battery module, and this reflected light can be totally reflected at the sealing resin 4-air interface on the back surface.

  Then, the light incident side of the transparent support 1 has a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface, thereby improving the transmittance at the module surface-air interface for light having a large incident angle. Can be made. Further, the shape of the back surface of the sealing resin 4 on the light incident side is formed such that a plurality of triangular prism-like convex lines are arranged in parallel on the surface, so that the surface of the sealing resin 4 on the back surface of light having a large incident angle— The transmittance at the air interface can be improved.

  Further, the transparent support 1 is disposed so that the groove direction (the extending direction of the triangular prism-shaped convex lines) is substantially 90 degrees with the groove direction of the sealing resin 4 (the extending direction of the triangular prism-shaped convex lines). Can keep the incident angle of light reflected from the back surface and incident on the module surface-air interface larger than the critical angle, and can re-reflect light at the module surface-air interface and contribute to power generation. The incident angle of light reflected on the front surface and incident on the sealing resin 4-air interface on the back surface can be kept larger than the critical angle, and the light is re-applied on the sealing resin 4 surface-air interface on the back surface. It can be reflected and contribute to power generation, and the power output can be increased.

  In addition, the unevenness | corrugation of the surface of the light incident side of the sealing resin 4 of the surface of the transparent support 1 and a back surface is small compared with the size of the transparent support 1 and the sealing resin 4 of a back surface in the plane direction, respectively, The arithmetic mean The roughness is preferably 10 millimeters or less and 1000 nanometers or more. When the arithmetic average roughness is less than 1000 nanometers, the surface unevenness becomes smaller than the wavelength of light, and the reflectivity due to the surface unevenness is lost. Moreover, when the arithmetic average roughness is larger than 10 millimeters, the productivity is deteriorated.

  In the solar cell module according to the third embodiment configured as described above, in the double-sided power generation solar cell module, the module is provided with a transparent material having prism structures whose directions are different by approximately 90 degrees on both sides of the module. -The light transmittance at the air interface can be increased, the light confinement efficiency at the module-air interface can be improved, and a solar cell module excellent in power generation output can be produced.

  The manufacturing method of the solar cell module according to the third embodiment as described above is obtained by using polycrystalline silicon solar cells (hereinafter referred to as cells 12) as solar cell elements 12 (double-sided power generation solar cell elements). A solar cell module will be described as an example with reference to FIGS. 6A to 6C are cross-sectional views of relevant parts for explaining a method of manufacturing the solar cell module according to the third embodiment.

  First, in two cells 12, a conductor is passed as an inter-element connection line 5 between the front-side electrode of one cell 12 and the back-side electrode of the other cell 12 (between the negative electrode and the positive electrode). By soldering, one cell 12 and the other cell 12 are electrically connected. This electrical connection is made to a plurality of cells 12 so that all the cells 12 are connected in series, and the cells 12 are connected in a row in a row.

  Next, an EVA sheet as the sealing resin 4 is placed on the plate-like transparent support 1 having an approximately in-plane shape in the in-plane direction, for example, on a transparent glass substrate. The plurality of formed cells 12 are placed so that the light receiving surface is on the transparent glass substrate side (FIG. 6-1). Here, the surface shape of the transparent support 1 opposite to the sealing resin 4 is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel. Then, a plurality of triangular prism-like convex lines are formed in a shape extending substantially parallel to a pair of sides of the transparent support 1 facing each other in the in-plane direction of the transparent support 1.

  From this, another EVA sheet is placed as the sealing resin 4, and a hard plate with irregularities thereon, that is, a mold 21 with irregularities in which a plurality of triangular prism-like convex lines are arranged in parallel, is provided. Overlap (Fig. 6-2). Here, the concavo-convex surface of the mold 21 is formed so as to form a certain angle or more with the surface on the sealing resin 4 side of the transparent glass substrate. And when mounting the metal mold | die 21 on an EVA sheet | seat, the groove direction (convex line direction) of the unevenness | corrugation of the metal mold 21 is the groove direction (convex line direction) of the convex line formed in the transparent support body 1. It arrange | positions so that it may make about 90 degree | times.

  The laminate is sandwiched between polytetrafluoroethylene films (not shown) so that EVA overflowing from the side does not adhere to the device, etc., and the entire laminate is sandwiched between diaphragms and heated to about 100 ° C. under reduced pressure. Then, the sealant is softened, and pressure is applied between the transparent glass substrate and the mold 21 to crimp the EVA sheet. Thereby, it is possible to form a structure in which the sealing resin 4 forms an angle of a certain angle or more with respect to the surface on the transparent glass substrate sealing resin 4 side on the back side of the solar cell module (FIG. 6-3).

  In the method for manufacturing the solar cell module according to the third embodiment configured as described above, the light at the module-air interface is provided by providing transparent materials having prism structures whose directions are approximately 90 degrees different on both sides of the module. While improving permeability, the light confinement efficiency at the module-air interface can be improved, and a solar cell module excellent in power generation output can be manufactured.

Embodiment 4 FIG.
In the fourth embodiment, a preferred embodiment of the light reflector according to the present invention will be described. FIGS. 7A and 7B are diagrams illustrating the configuration of the solar cell module that is the photovoltaic element module according to the fourth embodiment of the present invention. FIG. 7A is a cross-sectional view, and FIGS. These are the top views seen from the light-receiving surface side. FIG. 7C is a perspective view of relevant parts for explaining the configuration of the light reflector according to the fourth embodiment. FIG. 7A is a sectional view taken along line AA in FIG. The solar cell module according to the fourth embodiment has basically the same configuration as the solar cell module according to the first embodiment, and includes a transparent support 1, a solar cell element 2, a weather resistant resin film 3, and a sealing resin. 4, an inter-element connection line 5 and a light reflector 36 are provided.

  As the transparent support 1, a material having optical transparency such as transparent glass is used. For example, a plate glass having a refractive index of about 1.5 can be used. As the solar cell element 2, for example, a crystalline silicon solar cell such as a polycrystalline silicon solar cell can be used. As the weather resistant resin film 3, for example, a transparent polyethylene terephthalate resin or a polyethylene terephthalate resin in which a white pigment is kneaded as a reflector can be used. As the sealing resin 4, for example, ethylene vinyl acetate (EVA) having a refractive index of about 1.5 can be used. For example, a copper wire can be used as the inter-element connection line 5.

  As the light reflector 36, a film having a refractive index changed by changing, for example, a titania particle film, a density of tetrafluoroethylene or polyethylene having a refractive index of about 1.3, or containing inorganic particles as a light reflector having specular reflectivity. It is possible to use a dielectric body laminated with a metal foil such as an aluminum foil. And the light reflector 36 is arrange | positioned between the adjacent solar cell elements 2 and the back surface of a solar cell module so that the positive electrode and negative electrode of the solar cell element 2, and the connection line 5 between elements may not be short-circuited.

  Here, light reflection with high specular reflection is performed so that the incident angle θ of the light reflected from the light reflector 36 to the glass is not less than an angle (critical angle) satisfying the condition of the above formula (3). The body 36 is incident on a region other than the region of the solar cell element 2 by forming an inclined surface (light reflecting surface) so as to have a certain angle or more than θ / 2 with respect to the light receiving surface of the solar cell module. Then, the light reaching the back surface of the solar cell module is reflected and guided to the solar cell element 2, and a solar cell module excellent in power generation output can be obtained. Therefore, the light reflector 36 is mainly composed of a light-receiving surface of the solar cell module and an inclined surface (light reflecting surface) that forms an angle equal to or greater than the certain angle α shown in the above formula (4).

  For example, when the surface of the solar cell module is made of general glass, since the refractive index of the surface of the solar cell module is about 1.5, the critical angle is 42 degrees, which is an efficient light guide. Therefore, the angle formed by the inclined surface (light reflecting surface) of the light reflector 36 and the surface of the solar cell module needs to be 21 degrees or more. When an antireflection film or the like is applied to the glass surface, it is necessary to increase the angle formed by the inclined surface (light reflecting surface) of the light reflector 36 with the surface of the solar cell module according to the refractive index.

  On the other hand, the light reflected by the light reflector 6 having an angle α or more shown in the above equation (4) with respect to the light receiving surface is reflected at the glass-atmosphere interface and in a direction parallel to the light receiving surface. Although the light is guided, the larger the angle formed between the surface of the solar cell module and the light reflector 36, the more the light is angled in the direction parallel to the light receiving surface, so that the light guide distance becomes longer and the solar cell element. It becomes easy to be guided to. On the other hand, if the angle formed by the surface of the solar cell module and the light reflector 36 becomes too large, the light is multiple-reflected between the slopes (light reflecting surfaces) of the adjacent light reflectors 36 and light. The incident angle θ of the reflected light from the reflector 36 to the glass-atmosphere interface increases, and the reflected light is emitted from the glass, leading to a reduction in light guide efficiency.

  For this reason, as already shown in Patent Document 1, the light reflector is set so as to form an angle of about 30 degrees with respect to the light receiving surface, whereby light incident perpendicularly to the light receiving surface of the solar cell module is obtained. This increases the light guide distance in the direction parallel to the light receiving surface, and is particularly preferable for improving the power generation output. This is a case where the non-power generation region between cells is equal to or greater than the solar cell module thickness, and the solar cell module when the non-power generation region between cells is equal to or less than the solar cell module thickness. The angle of the light reflector does not become smaller than the critical angle of the module surface-atmosphere interface so that the light reflected by the reflector does not enter the back side electrode of the power generation element, rather than the light guide efficiency parallel to the surface of the module. It is desirable to make it smaller within the range.

  As described above, in the region including the non-power generation region between the solar cell elements 2 in the light receiving surface of the solar cell module, the light reflector 36 having regular reflectivity is the above-described formula with respect to the light receiving surface of the solar cell module. When arrange | positioning so that the angle (alpha) shown by (4) or more may be made, the arrangement | positioning can be arrange | positioned freely with respect to the non-electric power generation area | region between the solar cell elements 2. FIG. However, even if the light reflected from the light reflector 36 reenters the non-power generation region, it does not contribute to power generation. Therefore, not only the angle of the inclined surface (light reflection surface) of the light reflector 36 but also the non-power generation region. There is an optimum shape for the arrangement taken by the light reflector 36.

  In general, a polycrystalline silicon solar cell (hereinafter referred to as a cell) has a substantially quadrangular shape in a light receiving surface direction (hereinafter referred to as an in-plane direction). Therefore, the gap region in the in-plane direction between adjacent cells in the solar cell module often has a lattice shape. For this reason, when the inclined surface (light reflecting surface) of the light reflector is arranged in parallel to the vertical or horizontal side of the lattice in which the gap between adjacent cells is formed in the in-plane direction, the light reflector The reflected light does not re-enter the cell but re-enters the light reflector, which does not contribute to power generation and is wasted. For this reason, it is conceivable to form a photoreactor parallel to each of the vertical or horizontal sides of the lattice formed by the gap between the cells, but the gap between the reflector and the cell This is not preferable because it is necessary to align the position.

  Therefore, in the solar cell module according to the present embodiment, the intersection of the plane parallel to the inclined surface (light reflecting surface) of the light reflector 36 and the surface (light receiving surface) of the solar cell module is the solar cell in the plane. It arrange | positions so that it may become an angle other than 0 degree and 90 degree | times with respect to the longitudinal direction of the clearance gap between each element of an element row | line | column. That is, it is arranged so that the intersecting line is at an angle other than 0 degrees and 90 degrees with respect to the longitudinal or lateral side of the lattice formed by the gap between the adjacent solar cell elements 2 in the in-plane direction. Yes. By arranging the light reflector 36 in this way, the light reflected from the atmosphere-module surface and reflected into the solar cell module can be incident on the power generation region instead of the non-power generation region.

  And it is preferable to arrange | position the said intersection line so that it may become an angle of 45 degree | times with respect to the clearance gap in the in-plane direction between the adjacent solar cell elements 2. FIG. That is, it is preferable that the intersecting line is arranged at an angle of 45 degrees with respect to the vertical or horizontal side of the lattice formed by the gap between the adjacent solar cell elements 2 in the in-plane direction. As an example of this, with respect to the lattice formed by the gaps between cells, the intersecting line between the plane parallel to the inclined surface (light reflecting surface) of the light reflector 36 and the surface (light receiving surface) of the solar cell module is 45 degrees. The case of the arranged light reflector is shown in FIGS. 7-1 to 7-3. In this figure, the light reflector 36 has a surface structure in which a triangular prism is tilted sideways, and its ridgeline (a plane parallel to the inclined surface (light reflection surface) of the light reflector 36 and the surface of the solar cell module ( The line of intersection with the light receiving surface) is the vertical direction (Y direction in FIGS. 7-2 and 7-3) or the horizontal direction (FIG. 7) formed by the gap between the adjacent solar cell elements 2 in the in-plane direction. -2, the X direction in FIG. 7-3) is arranged at an angle of 45 degrees.

  In addition, when the spacing between the cells is different between the X direction and the Y direction in FIG. 7C, the light reflector 36 protrudes in a direction that forms an angle β defined by the following formula (5) with respect to the x axis. By arranging the light reflector 36 so that the groove of the line faces, the light reflected by the light reflector 36 in the non-power generation region can be guided to the solar cell element 2 to the maximum extent. Further, in the planar direction of the light receiving surface of the module, the extending direction of the concave line or the convex line of the light reflector 36 may be parallel to one diagonal line of the solar cell element 2.

  The light reflector 36 arranged in this way is a light reflector having a shape excellent in mass productivity. For this reason, the light reflector 36 itself is excellent in mass productivity, and alignment is unnecessary even when a solar cell module is manufactured using the light reflector 36, which is excellent in mass productivity and has a light guide amount to each cell. An increased solar cell module can be produced.

  The solar cell used in the present invention includes a solar cell using a double-sided light receiving element, a gallium arsenide solar cell, a microcrystalline silicon solar cell using a transparent conductive film, an amorphous silicon solar cell, a copper indium selenium solar cell, and a cadmium. A thin film solar cell such as a tellurium solar cell or a solar cell in which these are stacked can be used. In the case of a crystalline solar cell, the non-power generation region where the solar cell element is not arranged is in a lattice shape, and the width of the non-power generation region is often equal to or greater than the thickness of the solar cell module.

  On the other hand, in the thin-film solar cell, the non-power generation region between the elements has a shape in which straight lines are arranged in parallel, and the width of the non-power generation region is often less than or equal to the thickness of the solar cell module. In such a thin film solar cell, the light reflected by the light reflector is directed to the back electrode (non-power generation region) of the power generation element rather than the light guide efficiency in the direction parallel to the surface (light receiving surface) of the solar cell module. It is important not to enter. For this reason, the angle γ of the light reflector with respect to the surface (light-receiving surface) of the solar cell module is small within a range not smaller than the critical angle of the module surface-atmosphere interface, and is parallel to the main surface (slope) of the light reflector. It is desirable that the line of intersection between the flat surface and the surface (light-receiving surface) of the solar cell module is at an angle of 45 degrees or less with respect to the gap between each element of the solar cell element array. These values are determined by the ratio between the thickness of the solar cell module and the width of the non-power generation region, and it is necessary to satisfy the following formula (6) with respect to the long side direction of the non-power generation region.

  The solar cell module as described above can be manufactured as follows, for example. First, in the arranging step, a weather resistant resin film 3 having substantially the same shape as that of the transparent support 1 in the planar direction is prepared. And the light reflector 36 is formed in the convex line shape which has a fixed inclination with the side direction of the weather resistant resin film 3 in the plane direction of the weather resistant resin film 3 in this one surface side. Further, as in the first embodiment, all the cells 2 are connected in series, and the cells 2 are connected in a row to form a solar cell array. Next, the weather resistant resin film 3 is disposed with the sealing material sandwiched on the back side of the solar cell array and the weather resistant resin film 3 on the outside. Next, in the sealing step, the positions of the transparent support 1 and the weather-resistant resin film 3 in the plane direction are aligned, and the plane parallel to the light reflecting surface of the light reflector 36 and the light receiving surface of the solar cell module are aligned. Sealing is performed using the sealing resin 4 so that the intersecting line forms an angle other than 0 degrees and an angle other than 90 degrees with respect to the longitudinal direction of the gap between the solar cell elements 2 of the solar cell array. Thus, the solar cell module according to Embodiment 4 is obtained.

Embodiment 5 FIG.
FIG. 8-1 is a perspective view of relevant parts showing a configuration of a solar cell module which is a photovoltaic element module according to Embodiment 5 of the present invention. 8-2 is principal part sectional drawing which shows the structure of the solar cell module which is a photovoltaic element module concerning Embodiment 5 of this invention, and is AA sectional drawing in FIG. 8-1. FIG. 8-3 is a schematic diagram illustrating a cross-sectional structure on the light-receiving surface side of the photovoltaic element module according to the fifth embodiment of the present invention. The solar cell module according to the fifth embodiment basically has the same configuration as the solar cell module according to the first embodiment, and includes a transparent support 1, a solar cell element 2, a weather resistant resin film 3, and a sealing resin. 4, an inter-element connection line 5 and a light reflector 6 are provided.

  As the transparent support 1, a light-transmitting material such as transparent glass is used, and for example, a plate-like plate glass whose in-plane shape is a substantially square shape can be used. As the solar cell element 2, for example, a crystalline silicon solar cell such as a polycrystalline silicon solar cell can be used. Moreover, the solar cell element 2 comprises a solar cell element array in which a plurality of elements are separated from each other and provided on substantially one surface.

  As the weather resistant resin film 3, for example, a weather resistant polyethylene terephthalate resin or a polyethylene terephthalate resin kneaded with a white pigment as a reflector can be used. As the sealing resin 4, for example, a transparent sealing material such as ethylene vinyl acetate resin (EVA) can be used. For example, a copper wire can be used as the inter-element connection line 5. As the light reflector 6, for example, a metal foil such as an aluminum foil having light reflectivity, a vapor-deposited aluminum film, or the like can be used.

  The light reflector 6 having a high regular reflection property is used so that the incident angle θ of the light reflected from the light reflector 6 to the glass is not less than an angle (critical angle) satisfying the condition of the above formula (3). By forming an inclined surface (light reflecting surface) so as to have an angle of a certain angle or more than θ / 2 with respect to the light receiving surface of the solar cell module, it is incident on a region other than the region of the solar cell element 2 and the sun. The light reaching the back surface of the battery module is reflected and guided to the solar cell element 2, and a solar cell module excellent in power generation output can be obtained. Therefore, the light reflector 6 is mainly configured by the light reflecting surface that forms an angle equal to or larger than the angle α shown in the above mathematical formula (4) with the light receiving surface of the solar cell module.

  For example, when the surface of the solar cell module is made of general glass, since the refractive index of the surface of the solar cell module is about 1.5, the critical angle is 42 degrees, which is an efficient light guide. Therefore, the angle formed by the inclined surface of the light reflector 6 with the surface of the solar cell module needs to be 21 degrees or more. When an antireflection film or the like is applied to the glass surface, the angle formed by the inclined surface (light reflecting surface) of the light reflector 6 and the surface of the solar cell module needs to be increased according to the refractive index.

  On the other hand, the light reflected by the light reflector 6 having an angle α or more shown in the above equation (4) with respect to the light receiving surface is reflected at the glass-atmosphere interface and in a direction parallel to the light receiving surface. Although the light is guided, the larger the angle formed between the surface of the solar cell module and the inclined surface (light reflecting surface) of the light reflector 6, the more light is angled in the direction parallel to the light receiving surface. The distance becomes long and the light is easily guided to the solar cell element. On the other hand, if the angle formed between the surface of the solar cell module and the inclined surface (light reflecting surface) of the light reflector 6 becomes too large, the angle between the adjacent inclined surfaces (light reflecting surface) of the light reflector 6 is increased. The light is multiple-reflected, the incident angle θ of the reflected light from the light reflector 6 to the glass-atmosphere interface is increased, and the reflected light is emitted from the glass, so that the light guide efficiency is lowered.

  For this reason, as already shown in Patent Document 1, the light reflector 6 is set so as to form an angle of about 30 degrees with respect to the light receiving surface, so that the light vertically incident on the surface of the solar cell module is obtained. This increases the light guide distance in the direction parallel to the light receiving surface, and is particularly preferable for improving the power generation output.

  Moreover, as the surface shape of the transparent support 1, in order to increase the light transmittance of the light incident on the module surface-atmosphere interface from the sun with a large incident angle, the anti-glare property at the module surface-atmosphere interface is enhanced. In addition, it is preferable to use a glass on the surface of the solar cell module having irregularities as the light incident side transparent material. However, for this purpose, when the surface shape of the transparent support 1 is randomly uneven, the light reflected from the non-power generation region is an angle greater than the critical angle with respect to a plane parallel to the glass surface. Even if the light is incident on the module surface-atmosphere interface, a large number of light is not incident on the module surface-atmosphere interface, which forms irregularities, at an angle greater than the critical angle. And did not contribute to the current.

  In the solar cell module according to Embodiment 5 configured as described above, the light reflector 6 made of aluminum having light reflectivity is used as the weather resistant resin film 3 and the sealing resin 4 on the back surface of the solar cell module. Prepare in between. Here, the surface shape of the light reflector 6 is such that a plurality of triangular prism-like convex lines are arranged in parallel with a pair of opposite sides in the in-plane direction of the solar cell module in which the light receiving surface shape is substantially rectangular. It is a shape, and is mainly composed of a light receiving surface of the solar cell module and an inclined surface (light reflecting surface) that forms an angle equal to or greater than a certain angle α shown in the above formula (4). Thereby, the light incident on the non-power generation region between the adjacent solar cell elements 2 is reflected to the surface of the solar cell module by the light reflector 6 so as to be an angle larger than the critical angle of the module-air interface, This reflected light can be reflected at the module-air interface and guided to the solar cell element 2. Therefore, in the solar cell module according to the fifth embodiment, the light incident on the non-power generation region can be re-incident on the solar cell element 2 to increase the light utilization efficiency, and the solar power generation output can be increased. A battery module is realized.

  In addition, the unevenness | corrugation in the surface of the light reflector 6 is small compared with the size of the planar direction of the light reflector 6, and it is preferable that the arithmetic mean roughness is a size of 10 millimeters or less and 1000 nanometers or more. When the arithmetic average roughness is less than 1000 nanometers, the unevenness on the surface becomes the same as the wavelength of light, and the regular reflection due to the unevenness on the surface is lowered. Moreover, when the root mean square roughness is larger than 10 millimeters, productivity is deteriorated.

  Moreover, in general light guide from the non-power generation region to the power generation region by light scattering, most of the light reflected from the non-power generation region is incident on the module surface-atmosphere interface at an angle less than the critical angle. These lights were emitted from the glass into the atmosphere and looked white. In particular, in order to increase the transmittance of light with a large incident angle among the light incident on the module surface-atmosphere interface from the sun, and to increase the antiglare property at the module surface-atmosphere interface, the glass on the module surface is made uneven. Is used as a transparent material on the light incident side, most of the light incident on the module surface-atmosphere interface at an angle greater than the critical angle with respect to a plane parallel to the glass surface. It was transmitted without reflecting, and did not contribute to the current. On the other hand, in the solar cell module according to the fifth embodiment, most of the light incident on the non-power generation region between the solar cell elements 2 is reflected from the transparent support 1-atmosphere interface to be emitted from the transparent support 1. Therefore, the non-power generation area where the light reflector 6 is located looks dark. Thereby, the color of the non-power generation region can be made closer to the color of the solar cell element generally similar to black, and a solar cell module excellent in design is realized. This also increases the antiglare property.

  In addition, the unevenness | corrugation in the surface of the transparent support body 1 is small compared with the size of the planar direction of the transparent support body 1, and it is preferable that the arithmetic mean square roughness is a size of 10 millimeters or less and 1000 nanometers or more. When the arithmetic average roughness is less than 1000 nanometers, the unevenness of the surface becomes smaller than the wavelength of light, and the reflectivity with respect to the incident angle of the light to the plane constituting the unevenness of the surface is lowered. Moreover, when the arithmetic average roughness is larger than 10 millimeters, the productivity is deteriorated.

  On the other hand, the unevenness of the surface improves the transmittance of light with a large incident angle at the module surface-atmosphere interface, improving the power generation output and facilitating the transmission of light incident from the inside of the module to the module surface-atmosphere interface. Even if the light incident on the non-power generation region is reflected on the back side of the module, it is difficult to be reflected on the module surface side, so that the light incident on the non-power generation region cannot be effectively guided to the solar cell element and changed to output. Can not be. The shape on the light incident side of the transparent support 1 is a shape in which a plurality of triangular prismatic convex lines are arranged in parallel on the surface, and in particular, the shape on the light incident side of the transparent support 1 is a plurality of triangular prisms on the surface. This problem can be solved by forming the convex lines in parallel. In this case, with respect to incident light from the sun, light reflection on the surface of the transparent support 1 can be reduced, and antiglare properties can be improved. In addition, the light incident side of the transparent support 1 has a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface, thereby improving the transmittance of light with a large incident angle at the module surface-atmosphere interface. Power generation output is improved.

  In FIG. 8C, the angle θ <b> 1 is an angle with respect to the normal 41 of the slope A <b> 42 constituting the surface of the transparent support 1 to the entire module plane. Further, the angle θ2 is an angle with respect to the normal line 41 to the entire module plane of the slope B43 constituting the surface of the transparent support 1. The angles θ1 and θ2 are preferably close to 0 degrees because the light transmittance incident from the outside of the module is high, but the mechanical strength decreases as the angle approaches 0 degrees. In addition, when the angle is close to 0 degrees, the light reflected from the back surface of the module is also highly transmissive, so that the light reflected from the non-power generation region cannot be used effectively for power generation. Therefore, the power generation output can be improved by allowing the light incident on the module surface from the back surface to be incident on the inclined surface constituting the module surface at an angle equal to or larger than the critical angle θ. From this, as the slope angle constituting the module surface, the light incident perpendicularly to the module plane can be reflected by the slope of the surface of the transparent support 1 by satisfying the following formula (7). .

  Further, the angle θ2 is as small as possible from the viewpoint of directing the light reflected by the slope A42 in FIG. 8-3 to the inside of the solar cell module and the transmittance of incident light from the surface of the solar cell module. It is preferable that it is about 20 degrees or less. Further, in particular, by arranging the groove direction (extending direction of the triangular prism-like convex line) to be approximately 90 degrees with the groove direction of the light reflector 6 (extending direction of the triangular prism-like convex line), the back surface In addition, the incident angle of light reflected from the photovoltaic element surface and incident on the module surface-atmosphere interface from the inside of the solar cell module can be kept larger than the critical angle, and the light is re-reflected at the module surface-atmosphere interface. The power generation output can be increased and the power generation output can be increased. The angle formed between the extending direction of the triangular prismatic convex lines of the transparent support 1 and the extending direction of the triangular prismatic convex lines of the light reflector 6 is 90 from the transmission distance in the planar direction of the solar cell module. The angle is preferably 90 degrees, but may not necessarily be 90 degrees, for example, when the distance between the photovoltaic elements is narrow.

  Further, in the solar cell module according to the fifth embodiment, since the light incident on the non-power generation region can be re-incident on the solar cell element 2 to increase the light use efficiency, By increasing the area ratio, the power generation output can be increased without increasing the area of the solar cell element 2. In this case, the non-power generation area can be made wider for the purpose of increasing the output even if the power generation efficiency is lowered.

  In the solar cell module according to the fifth embodiment, when glass is used for the transparent support 1 and a material having a refractive index different from that of glass is used as the sealing resin 4, light is emitted even at the glass-sealing resin interface. Confinement is possible. Moreover, in the above, although the structure which seals the solar cell element 2 with glass, resin, and a resin film was assumed, you may form a reflector in the back using glass instead of a back surface resin film, The material is not limited only to that used in the above embodiment.

  Therefore, according to the solar cell module according to the fifth embodiment, the light incident on the non-power generation region where the solar cell element 2 does not exist can be effectively guided to the solar cell element 2, and high reliability and high designability can be obtained. And a solar cell module excellent in power generation output.

  The solar cell module 2 manufacturing method according to the fifth embodiment in which the light reflector 6 has a structure such that the above-described angle is formed with respect to the light receiving surface of the module is polycrystalline as the solar cell element 2. A polycrystalline silicon solar battery module using silicon solar battery cells (hereinafter referred to as cell 2) will be described as an example with reference to FIGS. FIGS. 9-1 to FIGS. 9-3 are principal part cross-sectional views illustrating an example of a method for manufacturing the solar cell module according to the fifth embodiment.

  First, in two cells 2, a conductor is passed as an inter-element connection line 5 between the front-side electrode of one cell 2 and the back-side electrode of the other cell 2 (between the negative electrode and the positive electrode). Is electrically connected to one cell 2 and the other cell 2. This electrical connection is made to a plurality of cells 2 so that all the cells 2 are connected in series, and the cells 2 are connected in a row in a row.

  Next, a sheet-like ethylene vinyl acetate resin (EVA) as the sealing resin 4 is formed on the plate-like transparent support 1 whose in-plane shape is substantially rectangular, for example, on a transparent glass substrate. Further, the plurality of cells 2 connected as described above are placed so that the light receiving surface is on the transparent glass substrate side (FIG. 9-1). Here, the surface shape of the transparent support 1 opposite to the sealing resin 4 is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel. Moreover, in this surface shape, the slope A42 and the slope B43 which comprise the surface of the transparent support body 1 are comprised so that the conditions of angle (theta) 1 and angle (theta) 2 mentioned above may be satisfy | filled. Then, a plurality of triangular prism-like convex lines are formed in a shape extending substantially parallel to a pair of sides of the transparent support 1 facing each other in the in-plane direction of the transparent support 1.

  From this, another EVA sheet is mounted as the sealing resin 4, and the weather resistance is made into a substantially rectangular shape by adhering an aluminum foil as a light reflector 6 in which, for example, a triangular columnar convex line having a parallel surface is aligned. A weather-resistant polyethylene terephthalate film as the resin film 3 is placed so that the light reflector 6 is on the light receiving surface side (EVA side) (FIG. 9-2). Here, the surface shape on one surface side (light-receiving surface side) of the weather-resistant resin film 3 is a shape in which a plurality of triangular prism-like convex lines are arranged in parallel, and the other surface side (back surface side) of the weather-resistant resin film 3. The surface of is flat. In addition, a plurality of triangular prism-like convex lines have a shape extending substantially in parallel with a pair of sides of the weather resistant resin film 3 facing in the in-plane direction of the weather resistant resin film 3. The surface on the one surface side (light-receiving surface side) of the weather-resistant resin film 3 is the same as the surface on the other surface side (back surface side) of the flat weather-resistant resin film 3 where the surfaces of the plurality of triangular prism-shaped convex lines are flat. It is formed so as to form an angle above a certain level.

  The light reflector 6 is formed along the surface shape on one surface side (light-receiving surface side) of the weather-resistant resin film 3, and is similar to the surface shape on one surface side (light-receiving surface side) of the weather-resistant resin film 3. A plurality of triangular prismatic convex lines are arranged in parallel. The uneven surface of the light reflector 6 is formed so as to form a certain angle or more with the surface on the other surface side (back surface side) of the flat weather-resistant resin film 3. When the weather resistant resin film 3 is placed on the EVA sheet, the groove direction (convex line direction) of the light reflector 6 is the groove direction (convex line direction) of the convex line formed on the transparent support 1. And are arranged so as to form approximately 90 degrees.

  Next, sandwich the laminate with a polytetrafluoroethylene film so that EVA overflowing from the side does not adhere (not shown), sandwich the entire laminate with a diaphragm, and heat to about 100 ° C. under reduced pressure. The sealant is softened and pressure is applied between the transparent glass substrate and the weather-resistant polyethylene terephthalate film to crimp the EVA sheet. Thereby, on the back side of the solar cell module, a structure in which the reflective film as the light reflector 6 forms an angle of a certain angle or more with respect to the light receiving surface of the solar cell module can be formed (FIG. 9-3). . In addition, although the case where the light reflector 6 was previously bonded to the light-receiving surface side surface of the weather resistant resin film 3 was described here, for example, an aluminum foil or the like on another EVA sheet as the sealing resin 4 The light reflecting body 6 and the weather resistant resin film 3 having the above-mentioned uneven surface shape are placed in this order. In this state, the light reflecting body 6 and the uneven surface shape of the weather resistant resin film 3 are You may make it the same shape.

  In the solar cell module manufacturing method according to the fifth embodiment as described above, the light reflector 6 having light reflectivity is placed between the weather-resistant resin film 3 and the sealing resin 4 on the back surface of the solar cell module. Form. Here, the light reflector 6 is mainly configured by a light-receiving surface of the solar cell module and an inclined surface (light reflecting surface) that forms an angle equal to or greater than a certain angle α shown in the above formula (4). Thereby, the light incident on the non-power generation region between the adjacent solar cell elements 2 is reflected to the surface of the solar cell module by the light reflector 6 so as to be an angle larger than the critical angle of the module-air interface, This reflected light can be reflected at the module-air interface and guided to the solar cell element 2. Therefore, according to the method for manufacturing a solar cell module according to the fifth embodiment, light incident on the non-power generation region of the solar cell module can be re-incident on the solar cell element 2 to increase the light use efficiency. A solar cell module with increased output can be manufactured.

  Further, in the light guide from the non-power generation region to the power generation region by light scattering that is generally used, the light is emitted from the glass to the atmosphere and looks white. On the other hand, in the method for manufacturing a solar cell module according to the fifth embodiment, the light that has entered the non-power generation region between the solar cell elements 2 is reflected at the transparent support 1-atmosphere interface to make the transparent support 1 Therefore, the non-power generation area where the light reflector 6 is located looks dark. Therefore, according to the method for manufacturing a solar cell module according to the fifth embodiment, the color of the non-power generation region can be made closer to a solar cell element generally similar to black, and is excellent in design. A solar cell module can be produced. Moreover, being excellent in design improves the antiglare property at the same time.

  In particular, the light incident side of the transparent support 1 has a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface, thereby reducing light reflection on the surface of the transparent support 1 and anti-glare. Can increase the sex. In addition, the light incident side of the transparent support 1 has a shape in which a plurality of triangular prism-like convex lines are arranged in parallel on the surface, thereby improving the transmittance of light with a large incident angle at the module surface-atmosphere interface. By arranging the groove direction (extending direction of the triangular prism-shaped convex line) to be approximately 90 degrees with the groove direction of the light reflector 6 (extending direction of the triangular prism-shaped convex line), the back surface The incident angle of light incident on the module surface-atmosphere interface after being reflected by the light can be kept larger than the critical angle, and the light can be re-reflected at the module surface-atmosphere interface to contribute to power generation. The output can be increased.

  In the method for manufacturing the solar cell module according to the fifth embodiment, the power generation output is increased without increasing the area of the solar cell element 2 by increasing the area ratio of the non-power generation region to the solar cell element 2. It also has the effect of being able to In this case, the non-power generation area can be made wider depending on the purpose.

  Moreover, in the manufacturing method of the solar cell module concerning Embodiment 5, when glass is used for the transparent support body 1 and the material from which refractive index differs from glass as the sealing resin 4, it is glass-sealing resin. Light confinement is possible even at the interface.

  Therefore, according to the method for manufacturing the solar cell module according to the fifth embodiment, the light incident on the non-power generation region where the solar cell element 2 does not exist can be guided to the solar cell element 2, and has high reliability and high design properties. And a solar cell module excellent in power generation output.

  In the above description, the case where the light reflector 6 is arranged so that the groove direction (convex line direction) is substantially 90 degrees with the groove direction (convex line direction) of the convex line formed on the transparent support 1 will be described. However, for example, the groove direction (convex line direction) of the light reflector 6 is an angle other than approximately 90 degrees (for example, 45 degrees) with the groove direction (convex line direction) of the convex line formed on the transparent support 1. It is also possible to arrange so that And when the space | interval between cells differs in a X direction (refer FIG. 7-2, FIG. 7-3) and a Y direction (refer FIG. 7-2, FIG. 7-3), said formula with respect to an x-axis. By arranging the light reflector 6 so that the groove of the convex line of the light reflector 6 faces in the direction of the angle β defined in (5), the light reflected by the light reflector 6 in the non-power generation region The solar cell element 2 can be led to the maximum.

  As described above, the photovoltaic element module according to the present invention is useful for realizing a photovoltaic element module that is excellent in design and power generation output.

  DESCRIPTION OF SYMBOLS 1 Transparent support body, 2,12 Solar cell element (cell), 3 Weather resistant resin film, 4 Sealing resin, 5 Inter-element connection line, 6 Light reflector, 16 Light reflector, 21 Mold, 36 Light reflector , 41 Normal to the entire module plane, 42 Slope A, 43 Slope B.

Claims (4)

A photovoltaic element array in which a plurality of photovoltaic elements are spaced apart from each other and arranged on substantially one surface, a light-transmitting surface material provided on the surface side of the photovoltaic element array, and the photovoltaic element A photovoltaic element module sealed between a back surface material provided on the back side of the element array,
The photovoltaic element is a double-sided power generation type,
The back material is a back material having optical transparency,
At least in a region corresponding to the plurality of double-sided power generation type photovoltaic elements, the surfaces of the front surface material and the light-transmitting back surface material are each recessed by a plurality of parallel wedge-shaped grooves formed linearly. A line is formed, or a convex line having a shape in which a plurality of triangular prismatic convex portions are arranged in parallel,
In the planar direction of the light receiving surface of the photovoltaic element module, the extending direction of the concave line or the convex line on the surface of the surface material and the extending direction of the concave line or the convex line on the surface of the back material having light transmittance Is different from
A photovoltaic element module characterized by the above. In the planar direction of the light receiving surface of the photovoltaic element module, the extending direction of the concave line or the convex line on the surface of the surface material and the extending direction of the concave line or the convex line on the surface of the back material having light transmittance Make an angle of 90 degrees,
The photovoltaic element module according to claim 1. The photovoltaic element module has a substantially rectangular shape in the plane direction of the light receiving surface,
The convex line on the surface of the surface material or the extending direction of the convex line forms an angle of 0 degree or 90 degrees with respect to the side direction of the photovoltaic element module in the planar direction of the light receiving surface,
The photovoltaic element module according to claim 1 or 2. A photovoltaic element array in which a plurality of photovoltaic elements are spaced apart from each other and arranged on substantially one surface, a light-transmitting surface material provided on the surface side of the photovoltaic element array, and the photovoltaic element A method for manufacturing a photovoltaic element module sealed with a sealing material between a back surface material provided on the back side of an element array,
The photovoltaic element is a double-sided power generation type,
The back material is a back material having optical transparency,
At least in a region corresponding to the plurality of double-sided power generation type photovoltaic elements, the surfaces of the front surface material and the light-transmitting back surface material are each recessed by a plurality of parallel wedge-shaped grooves formed linearly. A line is formed, or a convex line having a shape in which a plurality of triangular prismatic convex portions are arranged in parallel,
The back surface material is disposed on the back surface side of the photovoltaic element array, a surface material is disposed on the front surface side of the photovoltaic element array with a sealing material interposed therebetween, and the photovoltaic element array is disposed on the back surface material and The surface of the surface material in the planar direction of the light receiving surface of the photovoltaic element module is formed by sealing using a sealing material and molding the shape of the surface of the back material by embossing the back material. Forming a concave line or a convex line having an extending direction different from the extending direction of the concave line or the convex line on the surface of the back material having light transmittance,
A method for producing a photovoltaic element module, comprising:

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