CN102623525A - solar cell module - Google Patents

Abstract

The invention provides a solar battery module, which is provided with a solar battery panel (20) formed by arranging solar battery units with transparent substrates, a reinforcement framework (3) arranged on the back of the solar battery panel (20) and a buffering material (31) arranged between the solar battery panel (20) and the reinforcement framework (3), wherein the first main surface of the buffering material (31), which is opposite to the solar battery panel (20), is a flat surface; and the second main surface of the buffering material (31), which is opposite to the reinforcement framework (3), is a curved surface which is bent towards a length direction of the reinforcement framework (3) and laterally enables the reinforcement framework (3) to be protruded as a cambered section.

Description

solar cell module

This application is a divisional application of an application filed by Mitsubishi Electric Corporation on October 21, 2011 with the title of invention "solar battery module" and application number 200980158892.5.

technical field

The present invention relates to a solar cell module installed in a building such as a house or a building to generate electricity using sunlight.

Background technique

As a solar cell module, there is a structure in which a transparent substrate (glass) is arranged on the light-receiving surface side, a plurality of solar cell units connected in series or in parallel are arranged on the back side of the transparent substrate, and these plurality of solar cells are sealed with a sealing resin. The battery cells constitute a solar cell panel, and a frame is attached to the peripheral portion of the solar cell panel.

Solar battery modules are generally installed in buildings such as houses and buildings, and are exposed to wind and rain. Since solar cell modules are used in such a severe environment, the strength against wind load or snow load is one of the indicators of product quality. In recent years, in order to reduce the price per unit of output, or to shorten the time required for construction work and wiring work, the size of solar cell modules has been promoted. Due to this increase in size, the load-resistant performance of the transparent substrate of the solar cell panel is lowered.

On the solar cell module, since the snow load generated by the accumulated snow etc. on the surface acts so as to press down vertically, the solar cell module bends downward. As a countermeasure against this, in addition to the frame surrounding the four sides of the solar cell panel, there is also known a technique of providing a reinforcing frame on the back of the solar cell panel so as to be placed between the frames. The back supports the solar panel. In such a structure, it can be expected that the amount of deformation of the transparent substrate can be reduced when a load is applied.

In addition, in such a solar cell module having the above-mentioned reinforcing frame on the back of the panel, in order to further prevent abrasion of the bottom sheet or damage to the cells caused by collision or friction between the back of the panel and the reinforcing frame, a cushioning material. With such a structure, the back of the module does not come into direct contact with the reinforcing frame, so damage and abrasion of the back of the module can be prevented (for example, refer to Patent Document 1).

prior art literature

patent documents

Patent Document 1: Japanese Patent Laid-Open No. 2004-6625

Patent Document 2: International Publication No. 2008/139609

Contents of the invention

The problem to be solved by the invention

However, since the cushioning material proposed in Patent Document 1 is an elastic body, when the load applied to the module increases, the reinforcement frame is buried in the cushioning material, and the module is in contact with the reinforcement frame at a portion where the cushioning material is not placed. improve the situation. In addition, elastic cushioning materials may wear out due to repeated friction with the reinforcement frame against vibration loads such as wind pressure, so improvement of this situation is required.

In order to solve the above-mentioned problems, the solar cell module proposed in Patent Document 2 includes a cushioning material made of a hard material. However, since a cushioning material made of a hard material and having a simple rectangular parallelepiped structure is inserted between the substantially rigid solar cell panel and the reinforcing frame, local stress may concentrate at the end of the cushioning material. If this concentration of local stress occurs, the layer made of glass, in particular, of the solar cell panel may be damaged, and the load resistance of the module may decrease. Therefore, it is required to improve this situation.

The present invention was conceived to solve the above-mentioned problems, and its object is to provide a solar cell module that can relax the concentration of local stress generated at the end of the cushioning material, and can suppress the stress of the solar cell panel, especially the The damage of the layer (transparent substrate) made of glass can improve the reduction in the load resistance of the module.

means to solve the problem

In order to solve the above-mentioned problems and achieve the object, the solar cell module according to the first aspect of the present invention is characterized in that it has: a solar cell panel formed by arranging solar cell units including a transparent substrate; and a reinforcing frame arranged on the back surface of the solar cell panel ; The cushioning material disposed between the solar cell panel and the reinforcing frame, the first main surface of the buffering material facing the solar cell panel is a flat surface, and the second main surface facing the reinforcing frame is curved to the length direction of the reinforcing frame, The reinforcing frame side is formed into a curved surface with a convex arc-shaped cross section.

In addition, the solar battery module according to the second aspect of the present invention is characterized by comprising: a solar battery panel formed by arranging solar battery cells including transparent substrates; a reinforcing frame arranged on the back surface of the solar battery panel; The cushioning material between the reinforcing frame, the first main surface of the cushioning material facing the solar cell panel is a flat surface, and the second main surface facing the reinforcing frame is formed to extend in a direction perpendicular to the reinforcing frame. The plurality of protrusions, the curved surface of the corner lines that smoothly connect the plurality of protrusions is a curved surface with an arcuate cross section forming the reinforcement frame side into a convex shape.

In addition, here, the curved surface having an arc-shaped cross-section may be a curved surface having a substantially arc-shaped cross-section, and includes, for example, a configuration in which a partially smooth continuous plane is included in the middle of the curved surface.

In addition, the solar cell module according to the third aspect of the present invention is characterized in that it has: a solar cell panel formed by arranging solar cell units including a transparent substrate; a reinforcing frame arranged on the back surface of the solar cell panel; The buffer material between the reinforcement frame, the first main surface of the buffer material facing the solar cell panel is a flat surface, and at least the central part of the two ends of the length direction of the reinforcement frame on the second main surface facing the reinforcement frame are respectively Set with cutouts.

In addition, the solar battery module according to the fourth aspect of the present invention is characterized by comprising: a solar battery panel formed by arranging solar battery cells including transparent substrates; a reinforcing frame arranged on the back surface of the solar battery panel; The cushioning material between the reinforcing frame and the reinforcing frame is formed in a corrugated shape that expands and contracts in the longitudinal direction of the reinforcing frame and has elasticity in the thickness direction.

The effect of the invention

According to the solar cell module of the present invention, each of the cushioning materials has a characteristic shape, and local stress concentration generated between the solar cell panel and the cushioning material can be relaxed. In addition, it is possible to suppress breakage of the layer made of glass in particular of the solar cell panel, thereby having an effect of improving the reduction in the load resistance of the module.

Description of drawings

Fig. 1 is a perspective view showing the state of an initial step of assembling the solar cell module of the present invention.

2 is a perspective view showing a state in which a reinforcement frame is attached to an intermediate assembly having a frame-shaped frame attached to an outer edge of a solar cell panel from the back.

Fig. 3 is a perspective view showing a state in which the reinforcement frame has been attached to the intermediate assembly.

4 is a perspective view showing a state in which the cushioning material of Embodiment 1 of the solar cell module of the present invention is interposed between the solar cell panel and the reinforcement frame.

Fig. 5 is a diagram showing a state of the cushioning material according to Embodiment 1 viewed from three directions.

Fig. 6 is a diagram shown for explanation, and is a diagram corresponding to a cross-sectional view taken along the line A-A of Fig. 3 , showing the action point of the snow load and the reaction force of the reinforcement frame in a structure having a conventional cushioning material The point of action is consistent.

FIG. 7 is a schematic view showing a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of Embodiment 1. FIG.

8 is a perspective view showing a state in which the cushioning material of Embodiment 2 of the solar cell module of the present invention is interposed between the solar cell panel and the reinforcement frame.

Fig. 9 is a diagram showing a state of the cushioning material according to Embodiment 2 viewed from three directions.

FIG. 10 is a schematic diagram showing a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of Embodiment 2. FIG.

Fig. 11 is a perspective view of a buffer material in Embodiment 3 of the solar cell module of the present invention.

FIG. 12 is a schematic view showing a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of Embodiment 3. FIG.

Fig. 13 is a perspective view of a buffer material in Embodiment 4 of the solar cell module of the present invention.

Fig. 14 is a diagram showing a state of the cushioning material according to Embodiment 4 viewed from three directions.

Detailed ways

Hereinafter, embodiments of the solar cell module of the present invention will be described in detail with reference to the drawings. In addition, this embodiment does not limit this invention.

Implementation mode 1.

Fig. 1 is a perspective view showing the state of an initial step of assembling the solar cell module of the present invention. 2 is a perspective view showing a state in which a reinforcement frame is attached to an intermediate assembly having a frame-shaped frame attached to an outer edge of a solar cell panel from the back. Fig. 3 is a perspective view showing a state in which the reinforcement frame has been attached to the intermediate assembly.

The solar cell module has: a substantially rectangular flat solar cell panel 20; a buffer material 31 fixed to the back surface of the solar cell panel 20; and a rectangular frame-shaped frame 10 surrounding the outer edge of the solar cell panel 20 throughout. ; The reinforcement frame 3 installed on the frame-like frame 10 . The buffer material 31 is fixed at a position sandwiched between the solar cell panel 20 and the reinforcement frame 3 .

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

As shown in FIG. 2 , buffer material 31 is made of hard material such as aluminum or hard resin, is formed in a substantially flat shape, and is fixed to the back surface of solar cell panel 20 . Cutouts for fitting the reinforcing frames 3 are provided in the back central portions of the long side frames 1, 1, respectively. The reinforcement frame 3 is assembled to the long side frames 1, 1 so that both ends thereof fall into the fitting cutouts from the back side. Moreover, the terminal box 20a and the cable 20b extended from this terminal box 20a are provided in the back surface of the solar cell panel 20. As shown in FIG.

As shown in FIG. 3 , the reinforcing frame 3 is attached to the frame-shaped frame 10 so as to be bridged over the facing long-side frames 1 , 1 of the frame-shaped frame 10 . The reinforcing frame 3 is attached at a position where the cushioning material 31 is sandwiched between the solar cell panel 20 . In this way, the buffer material 31 is interposed between the solar cell panel 20 and the reinforcing frame 3 , and since the buffer material 31 is fixed on the back of the solar cell panel 20 , it will not move or fall off.

4 is a perspective view showing a state in which the cushioning material of Embodiment 1 of the solar cell module of the present invention is interposed between the solar cell panel and the reinforcement frame. Fig. 5 is a diagram showing a state of the cushioning material according to Embodiment 1 viewed from three directions. As shown in FIGS. 4 and 5 , the first main surface facing the solar cell panel 20 is formed as a substantially flat flat surface 31 a so as to be in flat contact with the solar cell panel 20 . On the other hand, the second main surface facing the reinforcing frame 3 is a curved surface 31b having an arcuate cross-section. The curved surface 31b having an arc-shaped cross section is a curved surface having an arc-shaped cross-section that curves in the longitudinal direction of the reinforcing frame 3 and forms the side of the reinforcing frame 3 in a convex shape. That is, the curved surface 31 b having an arcuate cross-section is a curved surface that is constituted by a part of a cylinder having a central axis perpendicular to the reinforcing frame 3 . In addition, the curved surface 31b having an arcuate cross-section is curved to a position where it continues to the flat surface 31a. That is, the cushioning material 31 of this embodiment does not have an end surface in the longitudinal direction of the reinforcement frame 3 .

Fig. 6 is a diagram shown for explanation, and is a diagram corresponding to a cross-sectional view taken along the line A-A of Fig. 3 , showing the action point of the snow load and the reaction force of the reinforcement frame in a structure having a conventional cushioning material The point of action is consistent. In FIG. 6 , in the conventional solar cell module, a simple cuboid-shaped cushioning material 41 is arranged between the solar cell panel 20 and the reinforcement frame 3 .

For example, when snow accumulates on the entire surface of the solar cell panel 20 and the snow acts on the solar cell panel 20 as a snow load F, the solar cell panel 20 bends over the entire surface. At this time, the surrounding 4 sides of the solar cell panel 20 are supported by the frame-shaped frame 10, and the central part is supported by the cushioning material 41, and the respective positions are not changed, so the other parts are deformed by sinking. Therefore, when the cushioning material 41 has a simple rectangular parallelepiped shape, local stress concentrates on the end surface of the cushioning material 41 or the like. Specifically, local stress is concentrated on the side (more specifically, the center portion of the side) of the longitudinal end surface 41 a of the cushioning material 41 on the solar cell panel 20 side. Therefore, at the portion of the local stress concentration point P, the layer made of glass, in particular, of the solar cell panel 20 may be damaged.

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 buffer material 31 of this embodiment, the first main surface on the side of the solar cell panel 20 is a flat surface 31a, and the second main surface on the side of the reinforcing frame 3 is a curved surface 31b with an arc-shaped cross section. The reaction force from the reinforcing frame 3 due to the snow load F is dispersed along the curved surface 31b of the arcuate cross section, and does not concentrate at one point.

According to the solar cell module of the present embodiment, as described above, the concentration of local stress generated between the solar cell panel 20 and the buffer material 31 can be alleviated. In addition, it is possible to suppress breakage of the layer made of glass in particular of the solar cell panel 20 , thereby improving the reduction in the load resistance of the module.

In addition, the first main surface of the buffer material 31 may be a substantially flat surface 31 a, or may be in contact with the solar cell panel 20 broadly and flatly. In addition, although the second main surface of the cushioning material 31 of the present embodiment is the curved surface 31b with an arc-shaped cross-section as described above, it is not limited to an arc, and it can also be obtained if it is a curved surface that smoothly draws an arc. Roughly the same effect. Furthermore, the curved surface 31b having an arc-shaped cross-section may be a curved surface having a substantially arc-shaped cross-section, for example, a shape including a partially smoothly continuous plane in the middle of the curved surface, and substantially the same effect can be obtained.

Implementation mode 2.

8 is a perspective view showing a state in which the cushioning material of Embodiment 2 of the solar cell module of the present invention is interposed between the solar cell panel and the reinforcement frame. Fig. 9 is a diagram showing a state of the cushioning material according to Embodiment 2 viewed from three directions. As shown in FIGS. 8 and 9 , in cushioning material 32 according to this embodiment, the first main surface facing solar cell panel 20 is formed as a substantially flat flat surface 32 a so as to be in flat contact with solar cell panel 20 .

On the other hand, on the second main surface facing the reinforcement frame 3, a plurality of protrusions 32b extending in a direction perpendicular to the reinforcement frame 3 are formed, and the corner lines (tops) that smoothly connect these plurality of protrusions 32b are formed. surface) becomes a curved surface 32b of an arcuate cross-section that forms the side of the reinforcement frame 3 in a convex shape. The intervals between the protrusions 32b are formed at appropriate intervals so that the solar cell panel 20 does not enter the grooves and deform. Moreover, the convex part 32b provided in the most end part has a substantially triangular cross-section, and the top surface continues with the flat surface 31a. That is, the cushioning material 32 of this embodiment does not have an end surface in the longitudinal direction of the reinforcement frame 3 . The other structures are the same as those in Embodiment 1.

FIG. 10 is a schematic view showing a state in which the reaction force from the reinforcement frame 3 side is dispersed by the cushioning material 32 of the second embodiment. The reinforcement frame 3 is in contact with the corners (top surface) of the convex portion 32b of the cushioning material 32, and is curved in the longitudinal direction of the reinforcement frame 3 to form a curved surface with an arcuate cross-section that forms a concave shape on the solar cell panel 20 side. Therefore, the reaction force R from the side of the reinforcing frame 3 is dispersed along the curved surface of the arc-shaped cross section. Therefore, substantially the same effect as that of the device of Embodiment 1 can be obtained. Moreover, according to the buffer material 32 of this embodiment, since the material of the part for forming a groove is reduced, cost reduction can be aimed at.

In addition, the curved surface formed by the cushioning material 32 is not limited to a curved surface having an arc-shaped cross section, and substantially the same effect can be obtained as long as it is a curved surface that smoothly draws an arc.

Implementation mode 3.

Fig. 11 is a perspective view of a buffer material in Embodiment 3 of the solar cell module of the present invention. FIG. 12 is a schematic view showing a state in which the reaction force from the reinforcing frame side is dispersed by the cushioning material of Embodiment 3. FIG. The buffer material 33 of the present embodiment is formed in a substantially rectangular parallelepiped flat shape, and the first main surface facing the solar cell panel 20 is a flat surface 33 a. In addition, notches 33 b are respectively provided at the center portions of both ends in the longitudinal direction of the reinforcement frame 3 on the second principal surface facing the reinforcement frame 3 . In other words, the notch 33b is provided at the center of the reinforcement frame 3 side of both longitudinal end faces of the reinforcement frame 3 . That is, the notch 33b is provided at the center of the side facing the solar cell panel 20 side of the longitudinal both ends of the reinforcing frame 3 where the local stress concentration point P ( FIG. 6 ) has conventionally existed.

According to the shock absorbing material 33 having such a structure, the notch 33b is provided in the center portion of the side facing the side where the local stress concentration point P exists conventionally. That is, there is no cushioning material in this portion. Therefore, when a stress acts, the end portion where the local stress concentration point P conventionally exists is slightly retreated toward the notch 33b side. Therefore, the reaction force from the reinforcement frame 3 side concentrated on the local stress concentration point is dispersed toward both ends in the short side direction as shown in FIG. 12 . Thereby, damage to the solar cell panel 20 is suppressed.

In addition, if the notch 33b is provided on at least the central portion of the side on the reinforcing frame 3 side among the four sides forming the both end faces (two faces) of the cushioning material 33 intersecting with the longitudinal direction of the reinforcing frame 3, it has a The effects are substantially the same even if they are provided over the entire length of the sides on the solar cell panel 20 side of the above-mentioned both ends. However, when the cutout 33b is provided on the side of the solar cell panel 20 of the above-mentioned two end faces, if the cutout 33b is formed too large, the contact area between the buffer material 33 and the solar cell panel 20 will be reduced, and only a small usage area can be obtained. Effect of cushioning material.

Implementation mode 4.

Fig. 13 is a perspective view showing a cushioning material according to Embodiment 4 of the solar cell module of the present invention. Fig. 14 is a diagram showing the state of the cushioning material according to the present embodiment viewed from three directions. The cushioning material 34 of the present embodiment is formed in a corrugated shape as a whole. In the cushioning material 33 of the present embodiment, on the entire two main surfaces of the first main surface facing the solar cell panel 20 and the second main surface facing the reinforcing frame 3 , a width along the width of the reinforcing frame 3 is formed. The plurality of pleats 34a extending in the longitudinal direction expand and contract in the longitudinal direction of the reinforcement frame 3 and have elasticity in the thickness direction.

The cushioning material 34 having such a structure extends in the longitudinal direction of the reinforcement frame 3 according to the magnitude of the force when a pressing force is applied from the solar cell panel 20 side or from the reinforcement frame 3 side. And, at the same time, it shrinks in the thickness direction. Thereby, the solar battery panel 20 is gently bent, and stress concentration with the reinforcement frame 3 is alleviated, so that damage to the solar battery panel 20 can be reduced.

In addition, one buffer material 31 to 34 in Embodiments 1 to 4 is provided between the solar cell panel 20 and the reinforcement frame 3 , but a plurality of buffer materials 31 to 34 may be arranged in the longitudinal direction of the reinforcement frame 3 . . As an example, the plurality of cushioning materials 31 to 34 are arranged at predetermined intervals in the longitudinal direction of the reinforcement frame 3 . Thereby, the deformation of the solar cell panel 20 can be made smaller, and the contact between the solar cell panel 20 and the reinforcement frame 3 can be prevented, so that the damage of the solar cell panel 20 can be more reliably prevented.

Industrial Utilization Possibility

As described above, the solar cell module of the present invention is suitable for use as a solar cell module installed in a building such as a house or a building, and is particularly suitable for a solar cell module installed in a place with a lot of snow or a place where severe wind and rain occur.

Symbol Description

1 long side frame

2 Short Side Frames

3 Strengthen the frame

10 rectangular frame-like frames

15 solar cells

20 solar panels

20a terminal box

20b cable

31～34 Cushioning material

31a, 32a, 33a flat face

31b Curved surfaces with arc-shaped cross-sections

32b Convex

33b incision

34a Pleats

41 Conventional cushioning materials

41a end face

P local stress concentration point

Claims (3)

1. A solar cell module, characterized in that it has: A solar panel formed by arranging solar cells comprising a transparent substrate; a reinforcing frame provided on the back side of said solar panel; a buffer material disposed between the solar cell panel and the reinforcing frame, The cushioning material is formed in a corrugated shape that expands and contracts in the longitudinal direction of the reinforcement frame and has elasticity in the thickness direction. 2. The solar cell module according to claim 1, wherein the buffer material is fixed on the back of the solar cell module. 3. The solar cell module according to claim 1 or 2, characterized in that, A plurality of cushioning materials are arranged in the longitudinal direction of the reinforcement frame.

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