JP5174939B2 - Solar cell module - Google Patents

Description

  The present invention relates to a solar cell module that is installed in a building such as a house or a building and generates power using sunlight.

  As a solar cell module, a transparent substrate (glass) is arranged on the light receiving surface side, and a plurality of solar cells connected in series or in parallel are arranged on the back side of the transparent substrate, and the plurality of solar cells are sealed. There is a structure in which a solar cell panel is configured by sealing with a stop resin, and a frame is attached to the peripheral portion of the solar cell panel.

  A solar cell module is generally installed in a building such as a house or a building and exposed to wind and rain. Since the solar cell module is a product used in such a harsh environment, the strength against wind load and snow load is one of the indexes representing product quality. In recent years, solar cell modules have been increased in size for the purpose of reducing the price per unit output and shortening the time spent on construction work and the time spent on connection work. With this increase in size, the load bearing performance of the solar cell panel, particularly the transparent substrate, is reduced.

  In the solar cell module, a snow load caused by snow accumulated on the surface works so as to push downward vertically and bends downward. As a countermeasure, in addition to a frame that surrounds the four sides of the solar cell panel, a reinforcing frame that is arranged so as to be bridged between the frames on the back surface of the solar cell panel and supports the solar cell panel from the back surface is provided. It is known. Such a structure can be expected to reduce the amount of deformation of the transparent substrate when a load is applied.

  In addition, in the solar cell module having the reinforcing frame on the back surface of the panel as described above, a buffer material is attached to the back surface of the panel in order to prevent backsheet wear and cell damage due to collision and friction between the back surface of the panel and the reinforcing frame. Is done. By adopting such a structure, the module back surface does not directly contact the reinforcing frame, so that damage or wear of the module back surface can be prevented (see, for example, Patent Document 1).

JP 2004-6625 A International Publication No. 2008/139609

  However, since the cushioning material proposed in Patent Document 1 is an elastic body, when the load on the module increases, the reinforcing frame is buried in the cushioning material, and the cushioning material is not disposed. Since the module and the reinforcing frame may come into contact with each other, improvement has been demanded. Further, the elastic cushioning material has been required to be improved because there is concern about wear due to repeated friction with the reinforcing frame against vibration loads such as wind pressure.

  In order to solve the above problem, the solar cell module proposed in Patent Document 2 includes a buffer material made of a hard material. However, when a shock absorber with a structure like a simple rectangular parallelepiped made of a hard material is inserted between the almost rigid solar cell panel and the reinforcing frame, local stress is concentrated at the end of the shock absorber. was there. If this concentration of local stress occurs, it may cause damage to the solar cell panel, especially the layer made of glass, which may cause a reduction in the load resistance of the module, and there has been a demand for improvement. .

  The present invention has been made to solve the above-described problems, and alleviates the concentration of local stress generated at the end of the buffer material, and breaks the layer (transparent substrate) of the solar cell panel made of glass in particular. It is an object of the present invention to obtain a solar cell module that can suppress the decrease in load resistance of the module.

  In order to solve the above-described problems and achieve the object, the present invention provides a solar battery panel in which solar cells including a transparent substrate are arranged, a reinforcing frame disposed on the back surface of the solar battery panel, and the solar battery. A cushioning material disposed between the battery panel and the reinforcing frame, wherein the cushioning material expands and contracts in the longitudinal direction of the reinforcing frame and has a bellows shape having elasticity in the thickness direction. Features.

  According to the present invention, the cushioning material has a characteristic shape, and alleviates the concentration of local stress generated between the solar cell panel and the cushioning material. And the failure | damage of the layer which uses glass as a material of a solar cell panel especially can be suppressed, and there exists an effect that the load resistance fall of a module can be improved by this.

FIG. 1 is a perspective view showing an initial process of assembling a solar cell module according to the present invention. FIG. 2 is a perspective view showing a state in which the reinforcing frame is attached from the back surface to the intermediate assembly in which the frame-like frame is attached to the outer edge portion of the solar cell panel. FIG. 3 is a perspective view showing a state where the attachment of the reinforcing frame to the intermediate assembly is completed. FIG. 4 is a perspective view showing a state in which the cushioning material of the first embodiment of the solar cell module according to the present invention is sandwiched and arranged between the solar cell panel and the reinforcing frame. FIG. 5 is a diagram illustrating a state in which the cushioning material according to the first embodiment is viewed from three directions. FIG. 6 is a diagram for explanation, and shows a state in which the action point of the snow load and the action point of the reaction force of the reinforcing frame coincide with each other with the conventional cushioning material taken along line AA in FIG. FIG. FIG. 7 is a schematic diagram showing a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of the first embodiment. FIG. 8 is a perspective view showing a state in which the cushioning material of the second embodiment of the solar cell module according to the present invention is sandwiched and arranged between the solar cell panel and the reinforcing frame. FIG. 9 is a diagram illustrating a state in which the cushioning material according to the second embodiment is viewed from three directions. FIG. 10 is a schematic diagram illustrating a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of the second embodiment. FIG. 11: is a perspective view of the buffer material of Embodiment 3 of the solar cell module concerning this invention. FIG. 12 is a schematic diagram illustrating a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of the third embodiment. FIG. 13: is a perspective view of the shock absorbing material of Embodiment 4 of the solar cell module concerning this invention. FIG. 14 is a diagram illustrating a state in which the cushioning material according to the fourth embodiment is viewed from three directions.

  Embodiments of a solar cell module according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing an initial process of assembling a solar cell module according to the present invention. FIG. 2 is a perspective view showing a state in which the reinforcing frame is attached from the back surface to the intermediate assembly in which the frame-like frame is attached to the outer edge portion of the solar cell panel. FIG. 3 is a perspective view showing a state where the attachment of the reinforcing frame to the intermediate assembly is completed.

  The solar cell module is a rectangular frame-shaped frame that surrounds the entire periphery of the solar cell panel 20 having a substantially rectangular flat plate shape, the buffer material 31 fixed to the back surface of the solar cell panel 20, and the outer edge of the solar cell panel 20. It has a frame 10 and a reinforcing frame 3 attached to the frame-like frame 10. The buffer material 31 is fixed to a position sandwiched between the solar cell panel 20 and the reinforcing frame 3.

  As shown in FIG. 1, the solar battery panel 20 is configured by a plurality of solar battery cells 15 arranged vertically and horizontally and has a substantially rectangular flat plate shape. The frame-like frame 10 is composed of a pair of opposed long side frames 1, 1 and a pair of short side frames 2, 2 connected between both ends of the long side frames 1, 1. The pair of long side frames 1 and 1 and the pair of short side frames 2 and 2 are connected to each other to form a rectangular frame 10.

  As shown in FIG. 2, the buffer material 31 is made of a hard material such as aluminum or hard resin, has a substantially flat plate shape, and is fixed to the back surface of the solar cell panel 20. A cutout for fitting the reinforcing frame 3 is provided at the center of the back surface of the long side frames 1, 1. The reinforcing frame 3 is assembled to the long side frames 1 and 1 by dropping both ends into the fitting notch from the back side. A terminal box 20a and a cable 20b extending from the terminal box 20a are provided on the back surface of the solar cell panel 20.

  As shown in FIG. 3, the reinforcing frame 3 is attached to the frame-shaped frame 10 so as to span the long-side frames 1, 1 facing the frame-shaped frame 10. The reinforcing frame 3 is attached to a position where the buffer material 31 is sandwiched between the reinforcing frame 3 and the solar cell panel 20. As described above, the buffer material 31 is disposed between the solar cell panel 20 and the reinforcing frame 3, but the buffer material 31 is fixed to the back surface of the solar cell panel 20, so that it moves or falls off. There is nothing to do.

  FIG. 4 is a perspective view showing a state in which the cushioning material of the first embodiment of the solar cell module according to the present invention is sandwiched and arranged between the solar cell panel and the reinforcing frame. FIG. 5 is a diagram illustrating a state in which the cushioning material according to the first embodiment is viewed from three directions. As shown in FIG.4 and FIG.5, the 1st main surface facing the solar cell panel 20 is the substantially flat flat surface 31a so that the solar cell panel 20 may be touched flat. On the other hand, the second main surface facing the reinforcing frame 3 is a curved surface 31b having an arcuate cross section. The cross-section arcuate curved surface 31b is a cross-section arcuate curved surface that curves in the longitudinal direction of the reinforcement frame 3 and protrudes toward the reinforcement frame 3 side. That is, the cross-section arcuate curved surface 31 b is a curved surface constituted by a part of a cylindrical shape having a central axis orthogonal to the reinforcing frame 3. And the circular arc-shaped curved surface 31b is curved to a position connected to the flat surface 31a. That is, the cushioning material 31 of the present embodiment does not have an end face in the longitudinal direction of the reinforcing frame 3.

  FIG. 6 is a diagram for explanation, and shows a state in which the action point of the snow load and the action point of the reaction force of the reinforcing frame coincide with each other with the conventional cushioning material taken along line AA in FIG. FIG. In FIG. 6, in a conventional solar cell module, a simple rectangular parallelepiped cushioning material 41 is disposed between the solar cell panel 20 and the reinforcing frame 3.

  For example, when snow accumulates on the entire surface of the solar cell panel 20 and this snow acts on the solar cell panel 20 as the snow load F, the solar cell panel 20 bends throughout. At this time, the peripheral four sides of the solar cell panel 20 are supported by the frame-like frame 10 and the center part is supported by the buffer material 41 so that the position does not change, so that the other parts are deformed so that they sink. . Therefore, when the shock absorbing material 41 has a simple rectangular parallelepiped shape, local stress concentrates on the end surface portion of the shock absorbing material 41 and the like. Specifically, local stress concentrates on the side of the end surface 41a in the longitudinal direction of the cushioning material 41 on the solar cell panel 20 side (more specifically, the central portion of the side). Therefore, the layer made of glass, in particular, of the solar cell panel 20 may be damaged at the local stress concentration point P.

  FIG. 7 is a schematic diagram showing a state in which the reaction force from the reinforcing frame 3 side is dispersed by the cushioning material 31 of the present embodiment. In FIG. 7, according to the cushioning material 31 of the present embodiment, the first main surface on the solar cell panel 20 side is the flat surface 31a, and the second main surface on the reinforcing frame 3 side is the circular arc-shaped curved surface 31b. Therefore, the reaction force from the reinforcing frame 3 against the snow load F is dispersed along the arcuate curved surface 31b and does not concentrate on one point.

  According to the solar cell module of the present embodiment, the concentration of local stress generated between the solar cell panel 20 and the buffer material 31 is reduced as described above. And the failure | damage of the layer which uses glass especially the material of the solar cell panel 20 can be suppressed, and, thereby, the load-proof fall of a module can be improved.

  In addition, the 1st main surface of the buffer material 31 should just be the substantially flat surface 31a, and should just be contact | abutted to the solar cell panel 20 flatly. In addition, the second main surface of the cushioning material 31 of the present embodiment is the circular arc-shaped curved surface 31b as described above, but is not limited to the circular arc, and is roughly a curved surface that smoothly draws an arc. Similar effects can be obtained. Furthermore, the cross-sectional arc-shaped curved surface 31b may be a curved surface having a substantially cross-sectional arc shape. For example, even if the curved surface includes a partially continuous flat surface in the middle of the curved surface, substantially the same effect can be obtained.

Embodiment 2. FIG.
FIG. 8 is a perspective view showing a state in which the cushioning material of the second embodiment of the solar cell module according to the present invention is sandwiched and arranged between the solar cell panel and the reinforcing frame. FIG. 9 is a diagram illustrating a state in which the cushioning material according to the second embodiment is viewed from three directions. As shown in FIGS. 8 and 9, in the cushioning material 32 of the present embodiment, the first main surface facing the solar cell panel 20 is a flat surface 32 a that is substantially flat so as to be in contact with the solar cell panel 20 in a flat manner. It has become.

  On the other hand, a plurality of convex portions 32b extending in a direction orthogonal to the reinforcing frame 3 are formed on the second main surface facing the reinforcing frame 3, and a curved surface that smoothly connects the ridge lines (top surfaces) of the plurality of convex portions 32b. However, it is a curved surface 32b having an arcuate cross section with the solar cell panel 20 side convex. The interval between the convex portions 32b is an appropriate interval so that the solar cell panel 20 does not enter the groove and deform. And the convex part 32b provided in the most edge part is a cross-sectional outline triangle shape, and the book surface is connected with the flat surface 31a. That is, the cushioning material 32 of the present embodiment does not have an end face in the longitudinal direction of the reinforcing frame 3. Other configurations are the same as those of the first embodiment.

  FIG. 10 is a schematic diagram illustrating a state in which the reaction force from the reinforcing frame 3 side is dispersed by the cushioning material 32 according to the second embodiment. The solar cell panel 20 comes into contact with the ridgeline (top surface) of the convex portion 32b of the cushioning material 32, and becomes a curved surface having an arcuate cross section that curves in the longitudinal direction of the reinforcing frame 3 and protrudes toward the reinforcing frame 3 side. Therefore, the reaction force R from the reinforcing frame 3 side is dispersed along this curved surface having an arcuate cross section. For this reason, the same effects as those of the first embodiment can be obtained. Moreover, according to the buffer material 32 of this Embodiment, since the material for the part in which the groove | channel is formed reduces, cost reduction can be aimed at.

  Note that the curved surface formed by the solar cell panel 20 is not limited to a curved surface having an arcuate cross section, and a substantially similar effect can be obtained as long as the curved surface smoothly draws an arc.

Embodiment 3 FIG.
FIG. 11: is a perspective view of the buffer material of Embodiment 3 of the solar cell module concerning this invention. FIG. 12 is a schematic diagram showing a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of the present embodiment. The buffer material 33 of the present embodiment has a substantially rectangular parallelepiped plate shape, and the first main surface facing the solar cell panel 20 is a flat surface 33a. And the notch 33b is provided in the center part of the longitudinal direction both ends of the reinforcement frame 3 of the 2nd main surface facing the reinforcement frame 3, respectively. In other words, the notch 33b is provided at the center of the side of the reinforcing frame 3 on both sides in the longitudinal direction on the reinforcing frame 3 side. That is, the notch 33b is provided in the center part of the side opposite to the side on the solar cell panel 20 side on both ends in the longitudinal direction of the reinforcing frame 3 where the local stress concentration point P (FIG. 6) is conventionally provided.

  According to the cushioning material 33 having such a configuration, the notch 33b is provided in the central portion of the side opposite to the side where the local stress concentration point P has conventionally been. That is, there is no buffer material in that portion. Therefore, when the stress is applied, the end portion where the local stress concentration point P has conventionally been slightly escapes to the notch 33b side. Therefore, the reaction force from the side of the reinforcing frame 3 concentrated on the local stress concentration point is dispersed in the direction of both ends in the short side direction as shown in FIG. Thereby, damage to the solar cell panel 20 is suppressed.

  The notches 33b are effective if provided at least in the center of the side of the reinforcing frame 3 on both sides in the longitudinal direction on the side of the reinforcing frame 3, and even if provided on the entire length of the side of the end surface on the solar cell panel 20 side. Similar effects can be obtained. However, if the notch 33b is excessively enlarged, the contact area between the buffer material 33 and the solar cell panel 20 is reduced, and only the effect of using a small buffer material can be obtained.

Embodiment 4 FIG.
FIG. 13: is a perspective view of the shock absorbing material of Embodiment 4 of the solar cell module concerning this invention. FIG. 14 is a diagram illustrating a state in which the cushioning material of the present embodiment is viewed from three directions. The cushioning material 34 of the present embodiment has a bellows shape as a whole. In the cushioning material 33 of the present embodiment, a plurality of extending in the short direction of the reinforcing frame 3 over the entire main surfaces of the first main surface facing the solar cell panel 20 and the second main surface facing the reinforcing frame 3. The pleats 34a are formed so as to expand and contract in the longitudinal direction of the reinforcing frame 3 and to have elasticity in the thickness direction.

  When a pressing force is applied from the solar cell panel 20 side or the reinforcing frame 3 side, the buffer material 34 having such a structure extends in the longitudinal direction of the reinforcing frame 3 according to the magnitude of the force. At the same time, it shrinks in the thickness direction. Thereby, since the solar cell panel 20 curves gently and the stress concentration between the reinforcement frames 3 is eased, damage to the solar cell panel 20 can be reduced.

  In addition, although the buffer materials 31-34 of the said Embodiment 1-4 are provided between the solar cell panel 20 and the reinforcement frame 3, the buffer materials 31-34 are the length of the reinforcement frame 3. A plurality may be arranged in the vertical direction. As an example, the plurality of cushioning materials 31 to 34 are arranged in the length direction of the reinforcing frame 3 with a predetermined interval. Thereby, since the distortion of the solar cell panel 20 can be further reduced and the contact of the solar cell panel 20 with the reinforcing frame 3 can be prevented, the solar cell panel 20 can be more reliably prevented from being damaged. it can.

  As described above, the solar cell module according to the present invention is useful for a solar cell module installed in a building such as a house or a building. In particular, the solar cell module is installed in a region where there is a lot of snow or a region where severe wind and rain occur. Suitable for battery modules.

DESCRIPTION OF SYMBOLS 1 Long side frame 2 Short side frame 3 Reinforcement frame 10 Rectangular frame-shaped frame 15 Solar cell 20 Solar cell panel 20a Terminal box 20b Cable 31-34 Buffer material 31a, 32a, 33a Flat surface 31b Sectional-arc-shaped curved surface 32b Convex part 33b Notch 34a Fold 41 Conventional cushioning material 41a End face P Local stress concentration point

Claims (3)

A solar panel formed by arranging solar cells including a transparent substrate;
A reinforcing frame disposed on the back surface of the solar cell panel;
A cushioning material disposed between the solar cell panel and the reinforcing frame;
The said buffer material is a bellows shape which expands-contracts in the longitudinal direction of the said reinforcement frame, and has elasticity in the thickness direction. The solar cell module characterized by the above-mentioned. The solar cell module according to claim 1, wherein the buffer material is fixed to a back surface of the solar cell module. 3. The solar cell module according to claim 1, wherein a plurality of buffer materials are disposed in a length direction of the reinforcing frame. 4.

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