JPH11354824A - Solar cell device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell device designed to effectively utilize a light by applying effectively the light to the back side as well. SOLUTION: A solder cell panel 1, having solar cell elements capable of generating the power by lights from the front and back sides, is fixed to a support base 3 with the back and front sides perpendicular to an installation plane, and a reflector 2 for reflecting the light onto the solar cell panel 1 is movably mounted on the support base 3 and moved to follow the sun. Since the reflector 2 can be moved according to the irradiation angle of the sunlight, the light can be applied efficiently to the front and back sides of the solar cell panel, having double-side incidence type solar cell elements.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell device, and more particularly, to a dual-incidence type solar cell device in which light is incident from the front and back surfaces of a solar cell element to generate power.

[0002]

2. Description of the Related Art Solar cells that directly convert light energy into electric energy use inexhaustible sunlight as an energy source, and thus have been spotlighted due to environmental problems and the like.

In recent years, in order to effectively use the light of the solar cell element, a transparent electrode is formed not only on the light incident side electrode but also on the back side electrode so that light is incident from the front and back of the solar cell element. Solar cells have been proposed.

FIG. 15 is a schematic sectional view showing an example of a solar cell element configured to allow light to enter from the front and back. This solar cell element has a structure in which substantially intrinsic amorphous silicon is sandwiched between a single crystal silicon substrate and an amorphous silicon layer, defects at the interface are reduced, and characteristics of a heterojunction interface are improved. (Hereinafter, referred to as HIT structure) is a solar cell element in which light can enter from the front and back surfaces.

As shown in FIG. 15, an intrinsic amorphous silicon layer 101 is formed on an n-type single crystal silicon substrate 100, and a p-type amorphous silicon layer 102 is formed thereon. A transparent electrode 103 made of ITO or the like on the light receiving surface is provided on the entire surface of the p-type amorphous silicon layer 102, and a comb-shaped collecting electrode 104 made of silver (Ag) or the like is formed on the transparent electrode 103 on the light receiving surface. Is formed. The back surface of the substrate 10 has a so-called BSF (Back Surface Field) type structure in which an internal electric field is introduced to the back surface of the substrate. That is, a highly doped n-type amorphous silicon layer 106 is provided on the back surface side of the substrate 100 via the intrinsic amorphous silicon layer 105. A rear transparent electrode 107 made of ITO or the like is formed on the high-doped n-type amorphous silicon layer 106, and a comb-shaped collecting electrode 108 made of silver (Ag) or the like is formed thereon. As described above, the BSF in which substantially intrinsic amorphous silicon is sandwiched between the crystalline silicon substrate and the amorphous silicon layer on the back surface side, defects at the interface are reduced, and the characteristics of the heterojunction interface are improved. It has a structure.

[0006] As described above, a solar cell element (hereinafter, referred to as a solar cell element) in which the front and rear surfaces have the same electrode structure composed of the same transparent electrode and collector electrode.
It is called a double-sided incident solar cell element. In the case of (2), when light is incident on the front and back surfaces with the same light amount, the output power increases at most about twice.

A solar cell roofing material using the above-described dual-incidence type solar cell element is, for example, Technical
Digest of International
PVSEC-99, Miyazaki, Japan, 1
996, pp. 207-210. As shown in FIG. 16, this solar cell roof material is placed in a surface plate 202 made of glass,
Is mounted so that the light receiving surface side of the surface is parallel to the surface plate 202, and a reflective member 201 having a concave and convex surface is provided below the solar cell device 200, and the reflective member 201 and the surface plate 202 are provided. It is configured such that light is diffused between the light source 202 and the rear surface of the solar cell device 200 to give light.

[0008]

By the way, the incident angle of sunlight on the solar cell device changes depending on the season and time. That is, in the season, the sun solstice in the winter solstice, the spring equinox (autumn equinox), and the summer solstice, and the time, the sunshine angles in the morning, daytime, and evening are different, and the light incident angles to the solar battery device are different.
In the above-described solar cell device, the light is irregularly reflected by the unevenness of the reflecting member 201, and the light is given to the solar cell device. However, the light is sufficiently guided with respect to a change in season or a change in time. It is not possible. For this reason,
It is preferable that the reflecting member follows the incident direction of sunlight so as to be at an optimal position.

Further, in the above solar cell device, the light receiving surface side of the solar cell device is mainly used, and the incident light from the rear surface side is slight.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned conventional problems. In a solar cell device having a solar cell element capable of generating electricity by light from the front and back surfaces, a solar cell device having good solar light It is an object of the present invention to provide a solar cell device that can provide the following.

Another object of the present invention is to provide a solar cell device capable of tracking a reflecting member in accordance with the direction of the sun and effectively taking in sunlight.

[0012]

A solar cell device according to the present invention comprises a solar cell panel having a solar cell element capable of generating electric power by light from the front and back surfaces so that the front and back surfaces are perpendicular to the installation surface. In addition to the supporting member, a reflecting member for reflecting light is provided on the solar cell panel.

As described above, the front and back surfaces of the solar cell panel are supported in a direction perpendicular to the installation surface, and the reflectors for guiding the light are provided on the front and back surfaces, so that the light is applied to the front and back surfaces of the solar cell panel. I can guide you.

It is preferable that the reflecting member is configured to move in the direction of the sun.

Further, the means for moving the reflection member includes:
The operation may be started according to the amount of sunlight irradiation.

With the above configuration, the reflecting plate can be moved in accordance with the irradiation angle of the sun's light, so that light can be efficiently applied to the front and back surfaces of a solar cell panel having a dual-incident solar cell element. Can be incident.

Further, the present invention supports a solar cell panel having a solar cell element capable of generating power by light from the front and back surfaces so that the front surface is parallel to the installation surface, and
The solar cell panel includes a reflecting member for reflecting light, and the reflecting member moves in the direction of the sun.

The means for moving the reflection member may start the operation in accordance with the amount of sunlight irradiation.

With the above configuration, the reflecting plate can be moved in accordance with the irradiation angle of the sun's light, so that light can be efficiently applied to the front and back surfaces of a solar cell panel having a dual-incident solar cell element. Can be incident.

[0020]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 4 are schematic views showing the outline of a first embodiment of the present invention.

As shown in FIG. 1, a solar cell panel 1 provided with a plurality of the above-mentioned double-sided incident type solar cell elements has a holder 3c such that the light receiving surface (front side and back side) is perpendicular to the installation surface. To the support base 3. The support base 3 has reflectors 2 a and 2 b having an arc-shaped cross section attached to the support base 3 by a hinge 5 so as to be rotatable (swingable) with respect to the support base 3. Between the reflectors 2a, 2b and the arms 3a, 3b provided on the support base 3, the reflectors 2a, 2b are urged toward the solar cell panel 1, that is, in the direction of arrow A in the figure. Biasing springs 4a and 4b are provided. Also,
Although not shown, a stopper for stopping the reflection plates 2a and 2b at predetermined positions is provided.

Further, the reflectors 2a, 2b and the arms 3a, 3b
Between them are provided urging means 6 and 7 made of a shape memory alloy for swinging the reflector. The reflection plates 2a, 2
b and the urging means 6, 7 are connected by hooks 6b, 7b, respectively. Shape memory alloy part 6 of urging means 6, 7
a and 7a are configured to contract when the temperature rises.

The temperature at which the shape memory alloy portions 6a and 7a start shrinking is determined in consideration of the position, direction, area, and the like where the solar cell device is set. For example, the biasing means 7 is east. In this case, a shape memory alloy portion 6a having a higher shrinkage start temperature than the shape memory alloy portion 7a may be used. When the solar cell panel 1 is installed in the east-west direction, the shape memory alloy part of the biasing means located on the upper side has a higher shrinkage start temperature than the shape memory alloy part located on the lower side. I just need.

Now, in the solar cell device configured as described above, the urging means 6, 7 are controlled by the incident angle of the sun.
Are different in the amount of light that strikes each. For example, when light is not applied to both sides, such as at night, the shape memory alloy portion 6a,
7a, the temperature did not rise, and the shape memory alloy portions 6a, 7b
Is relaxed, and the reflecting plate 2 is moved by the urging force of the urging springs 4a and 4b.
1a and 2b rotate in the direction of arrow A in the figure, and as shown in FIG. 1, are brought into a state where they are held at predetermined positions by stoppers (not shown).

In this embodiment, the reflection plate 2
The case where a and b move with time will be described. Therefore, in FIGS. 1 to 4, the left side of the figures is east, and the right side is west.

In the state shown in FIG. 1, when sunlight is irradiated from the left side in the figure as in the morning, the urging means 7 is irradiated with sunlight, but the urging means 6 is Light is not irradiated by the shadows 2a and 2b). The irradiated light causes a change in the temperature of the biasing member 7 made of a shape memory alloy. When the shape memory alloy part 7a is heated to a predetermined temperature or more by light irradiation, the shape memory alloy part 7a contracts as shown in FIG.
The reflection plate 2b opens against the urging force of the urging spring 4b, and guides sunlight efficiently to the solar cell panel 1.

Since the shape memory alloy portion 6a of the urging means 6 remains shaded, the temperature does not rise and remains relaxed, and the reflecting plate 2a is in contact with the stopper by the urging spring 4a. Keep.

Subsequently, when the sunlight reaches the middle of the south, the urging means 7 also enters the shadow by the reflection member 2b, and the temperature of the shape memory alloy portion 7a of the urging means 7 decreases. When the temperature of the shape memory alloy part 7a becomes lower than the shrinkage temperature, the shape memory alloy part 7a relaxes. When the shape memory alloy portion 7b is relaxed, the reflecting plate 2b is rotated by the biasing spring 4b, and the reflecting plate 2b comes into contact with the stopper, and the state shown in FIG. 3 is obtained. Also,
Since the shape memory alloy portion 6a of the urging means 6 remains shaded, the temperature does not rise and remains relaxed.
As a result, the reflection plate 2a is kept in contact with the stopper.

The reflectors 2a and 2b should be shaped so that the light can be efficiently guided to the front and back surfaces of the solar cell panel 1 when the sunlight is in the vicinity of the center of the south. Is preferred. Therefore, in this embodiment, when the reflectors 2a, 2b are positioned in a shape that is symmetrical to the solar cell panel 1, the solar cell panel 1 is positioned via the reflectors 2a, 2b. The shapes of the reflection plates 2a and 2b are determined so that light is guided to the front and back surfaces without waste.

In the evening, as shown in FIG.
When sunlight is irradiated from the right side in the figure, the urging means 6 is irradiated with sunlight, but the urging means 7 is not irradiated with light due to the shadow of the reflection plate 2. The irradiation light causes a change in the temperature of the biasing member 6 made of a shape memory alloy. When the shape memory alloy portion 6a is heated to a predetermined temperature or higher by light irradiation, as shown in FIG. 4, the shape memory alloy portion 6a contracts, and the reflecting plate 2a opens against the urging force of the urging spring 4a, The sunlight is efficiently guided to the solar panel 1.

Since the shape memory alloy portion 7a of the biasing means 7 remains shaded, the temperature does not rise and the shape memory alloy portion 7a remains relaxed.
The reflecting plate 2b is kept in contact with the stopper by the urging spring 4b.

With the above configuration, the reflecting plates 2a and 2b can be moved in accordance with the irradiation angle of the sun's light, so that the front and back surfaces of the solar cell panel 1 provided with the dual-incident solar cell element can be moved. Light can be efficiently incident on the surface.

A second embodiment of the present invention will be described with reference to FIGS.

As shown in FIG. 5, similarly to the first embodiment, the solar cell panel 1 provided with a plurality of double-incident solar cell elements has a light receiving surface (front side and back side) with respect to the installation surface. ) Is a reflector 2 having a semicircular cross section so that
It is fixed to. A shaft 2e is fixed to the bottom of the reflection plate 2, and the shaft 2e is mounted on a support base 13 having a bearing 3d.
, The reflector 2 and the solar cell panel 1 are rotatably (swingably) supported. And on the shaft 2e,
A pinion gear 14 is attached. Then, the pinion gear 14 meshes with the rack gear 15. Shafts 16a and 16b are attached to the rack gear 15, and the shafts 16a and 16b are attached to the support members 18 and 18 via elastic members 17a and 17b which expand and contract according to heat. That is, the rack gear 15 is supported by the support members 18 and 18 via the shafts 16a and 16b and the elastic members 17a and 17b.
It will be supported in between. Also, the elastic members 17a, 1
7b is a supporting member 1 with a predetermined tension applied.
8 and 18 are fixed.

The above-mentioned telescopic members 17a, 17 are, for example, constituted by air cylinders, and the gas filled therein expands when the temperature rises, and the telescopic members 17a, 17 are expanded.
7b is extended, and when the temperature decreases, the gas contracts due to contraction.

The expansion coefficients of the elastic members 17a and 17b are as follows.
What is necessary is just to determine in consideration of the position, direction, area, etc. in which the solar cell device is installed.

In the structure of the solar cell device according to the second embodiment, the amount of light that strikes the elastic members 17a and 17b differs depending on the angle of incidence of the sun. For example, when there is no light on both sides, such as at night,
With the elastic members 17a and 17b both contracted, the rack gear 15 is located at the center at the same length, and the reflector 2 and the solar cell panel 1 are located at the center as shown in FIG. .

The case where the reflecting plate 2 moves with time will be described also in the second embodiment. Therefore, in FIGS. 5 to 8, the left side of the figures is east and the right side is west.

In the state shown in FIG. 5, when sunlight is irradiated from the left side in the figure as in the morning, the sunlight is emitted to the elastic member 17b, but the elastic member 17a is shaded by the reflection plate 2. No light is emitted. The elastic member 1
7b is heated, the elastic member 17b is extended, and the rack gear 1
5 moves in the direction of the arrow B in the figure, the reflector 2 and the solar cell panel 1 rotate in the direction of the arrow B, and as shown in FIG. Moving.

Subsequently, when the sunlight reaches the middle of the south, light is applied to the elastic member 17a, and the temperature of the elastic member 17a increases. Then, the expansion and contraction member 17a extends, the rack gear 15 moves to a position where the expansion and contraction members 17a and 17b can be balanced, and the reflection plate 2 and the solar cell panel 1 rotate clockwise in FIG. To the state of.

It is preferable from the viewpoint of power generation efficiency that the reflecting plate 2 be shaped so that light is guided to the front and back surfaces of the solar cell panel 1 without waste when sunlight is in the vicinity of the south. . Therefore, in this embodiment, when the sun is irradiated from directly above, the shape of the reflector 2 is determined so that light is guided to the front and back surfaces of the solar cell panel 1 through the reflector 2 without waste. Have been.

Then, in the evening, as shown in FIG.
When the sunlight is irradiated from the right side in the figure, the elastic member 17a
Is exposed to sunlight, but the elastic member 17b is
No light is illuminated by the shadow of. Elastic member 17 before and after the south
The rack gears 15 are located at the central portion with the same length, and the reflection plate 2 and the solar cell panel 1 are located at the central portion while a and 17b are extended.

7, when the sunlight is irradiated from the right side in the figure as in the evening, the elastic member 17a is irradiated with the sunlight, but the elastic member 17b is reflected by the shadow of the reflector 2. Is not irradiated. The expandable member 17a is heated by the irradiated light, the expandable member 17a expands, and the rack gear 15 moves in the direction of arrow A in the figure, whereby the reflector 2 and the solar cell panel 1 rotate in the direction of arrow A. As shown in FIG. 8, the solar light moves in a direction to guide the solar light to the solar cell panel 1 efficiently.

With the above configuration, the reflecting plate 2 can be moved in accordance with the irradiation angle of the sun's light.
Light can be efficiently made incident on the front and back surfaces of.

A third embodiment of the present invention will be described with reference to FIG. In the third embodiment, a case where the reflecting plate 2 moves with time will be described. Therefore, in FIG. 9, the left side of the figure is described as east and the right side is described as west.

As shown in FIG. 9, similarly to the second embodiment, the solar cell panel 1 provided with a plurality of double-sided incident type solar cell elements has a light receiving surface (front side and back side) with respect to the installation surface. Side) is fixed to the reflection plate 2 so as to be vertical. A shaft 2e is fixed to the bottom of the reflecting plate 2, and the shaft 2e is supported by a support base 13 having a bearing 3d so that the reflecting plate 2 and the solar cell panel 1 can rotate (swing) freely. Supported.

Moving members 20 and 21 for swinging the reflecting plate 2 are connected to the reflecting plate 2. The moving members 20, 21 are attached to the reflection plate 2 by hooks 20b, 21b. The main bodies of the moving members 20 and 21 are provided with rack gears 20a and 21a, respectively. The rack gear 20a and the rack gear 19a are
c, and the rack gear 21a and the rack gear 19b are connected via a pinion gear 21c.

A shaft 16a and a shaft 16b are attached to the rack support 19 having the rack gears 19a and 19b.
The telescopic member 1 in which the shafts 16a and 16b expand and contract in response to heat.
It is attached to the support members 18, 18 via 7a, 17b. That is, the rack gears 19a, 19b are
6b and the supporting member 1 via the elastic members 17a and 17b.
It will be supported between 8 and 18. In addition, the elastic member 1
7a and 17b are fixed to the supporting members 18 and 18 in a state where a predetermined tension is applied.

The expandable members 17a and 17b are formed of, for example, air cylinders as in the second embodiment described above, and the gas filled therein expands when the temperature rises, and the expandable members 17a and 17b are expanded. 17b is extended, and when the temperature decreases, the gas contracts by contracting.

The movable members 20 and 21 move up and down due to the expansion and contraction of the expandable members 17a and 17b, and the reflecting plate 2 and the solar cell panel 1 swing due to the vertical movement. That is, when the rack gears 19a and 19b move in the direction of arrow A in the figure, the moving member 20 moves down, and conversely, the moving member 21 moves up. As a result, the reflection plate 2 and the solar cell panel 1 rotate in the direction of arrow A.

When the rack gears 19a and 19b move in the direction of arrow B in the figure, the moving member 20 moves up, and conversely, the moving member 21 moves down. As a result, the reflection plate 2 and the solar cell panel 1 rotate in the arrow B direction.

The expansion rates of the elastic members 17a and 17b are as follows:
What is necessary is just to determine in consideration of the position, direction, area, etc. in which the solar cell device is set.

In the solar cell device of the third embodiment configured as described above, the amount of light that strikes the elastic members 17a and 17b differs depending on the incident angle of the sun. For example, when there is no light on both sides, such as at night,
The rack supports 19 are located in the center at the same length, and the movable members 20 and 21 are at the same height in a state in which the elastic members 17a and 17b are both contracted, and the reflecting plate 2 and the solar cell panel 1 Is located in the center.

When the sunlight is irradiated from the left side in the figure, as in the morning, the elastic member 17b is irradiated with sunlight, but the elastic member 17a is not irradiated with light due to the shadow of the reflection plate 2. The irradiating light heats the elastic member 17b,
The extension member 17b extends and the rack gears 19b and 19a move in the direction of arrow B in the figure, so that the moving member 21 moves down, the moving member 20 moves up, and the reflector 2 and the solar cell panel 1 rotate in the direction of arrow B, It moves in a direction to guide the sunlight to the solar cell panel 1 efficiently.

Subsequently, when the sunlight reaches the south center, the light is irradiated to the elastic member 17a, and the temperature of the elastic member 17a rises. Then, the expansion and contraction member 17a extends, the rack gears 19a and 19b move to a position where the expansion and contraction members 17a and 17b can be balanced, and the moving member 20 is lowered,
When the moving member 21 is raised, the reflection plate 2 and the solar cell panel 1 rotate in the direction A in the drawing, and the solar cell panel 1 and the reflection plate 2 are located at the center.

It is preferable from the viewpoint of power generation efficiency that the reflecting plate 2 be shaped such that light is efficiently guided to the front and back surfaces of the solar cell panel 1 when sunlight is in the vicinity of the southern part. . Therefore, in this embodiment, when the solar cell panel 1 and the reflector 2 are located at the center,
The shape of the reflector 2 is determined so that light is guided to the front and back surfaces of the solar cell panel 1 without waste.

In the evening, when sunlight is irradiated from the right side in the figure, the elastic member 17a is irradiated with sunlight, but the elastic member 17b is not irradiated with light due to the shadow of the reflection plate 2. Before and after the south, the telescopic members 17a and 17b are in an extended state, the rack gears 19a and 19b are located at the center of the same length, the moving members 20 and 21 have the same height 21, and the reflection plate 2 and the solar cell Panel 1 is located at the center.

In this state, when sunlight is irradiated from the right side in the figure as in the evening, the elastic member 17a is irradiated with sunlight, but the elastic member 17b is irradiated with light by the shadow of the reflection plate 2. Not done. The expandable member 17a is heated by the irradiated light, the expandable member 17a extends, and the rack gears 19a,
9b moves in the direction of arrow A in the figure, the moving member 21 moves up, the moving member 20 moves down, the reflector 2 and the solar cell panel 1 rotate in the direction of arrow A, and the solar cell panel 1 is efficiently scattered by sunlight. Move in the direction to guide.

With the above configuration, the reflecting plate 2 can be moved in accordance with the irradiation angle of the sun's light.
Light can be efficiently made incident on the front and back surfaces of.

In the above-described embodiment, the reflecting plate 2 (solar cell panel 1) is moved so as to follow the direction of the sun with the passage of time. The reflection plate 2 can be moved to efficiently enter the light from the sun. For example, FIG.
0 shows the schematic configuration. The solar altitude is high during the summer solstice and low during the winter solstice.

As shown in FIG. 10, the solar cell panel 1 is arranged in the east-west direction, and the opening of the reflection plate 2 faces the south.
Then, the reflector 2 (and the solar cell panel 1) is arranged and installed so that the reflector 2 (and the solar cell panel 1) is positioned at the center corresponding to the solar altitude at the time of the spring equinox (autumn equinox). Although not shown, means for moving the reflector 2 as shown in the first to third embodiments are attached to the reflector 2 shown in FIG.

When the sun altitude is lower than the day of the spring equinox (autumn equinox), only the lower moving member is irradiated with sunlight, and the upper moving member becomes a shadow of the reflector and becomes the sun. No light is emitted. For this reason, the temperature of the lower moving member rises, the reflecting plate 2 moves downward, stops at a position suitable for the lowered solar altitude, and efficiently transmits sunlight to the front and back of the solar cell panel 1. I can guide you to

When the sun altitude becomes higher than the day of the spring equinox (autumn equinox), only the upper moving member is irradiated with sunlight, and the lower moving member is shaded by the reflector. No sunlight is irradiated. For this reason, the temperature of the upper and lower moving members rises, the reflecting plate 2 moves upward, stops at a position suitable for the increased solar altitude, and guides sunlight efficiently to the front and back of the solar cell panel. it can.

In the above-described solar cell device, the reflector 2 is located at the lowest position during the winter solstice, and at the uppermost position during the summer solstice, and the reflector 2 moves as the solar altitude changes. That is,
When the season changes with the summer solstice, autumn equinox, winter solstice, and vernal equinox,
The reflector 2 moves upward from the middle position, and then moves downward after reaching the highest position during the summer solstice. It returns to the middle position during the autumn equinox, and becomes the lowest position during the winter solstice. After the winter solstice, the reflector 2 moves upward and returns to the middle position on the spring equinox day.

As described above, in this embodiment,
The position of the reflector 2 according to the season can be obtained, and a solar cell device provided with a reflector that follows the solar altitude can be provided. Also,
With respect to a change in the incident direction of sunlight due to a time change, light is incident on the front and back surfaces of the solar cell panel 1 by irregularly reflecting between the reflection plate 2 and the solar cell panel 1.

The interval S between the solar cell devices is set such that the shadow of the reflector of one solar cell device does not affect the other solar cell device.

In the above embodiment, the reflector 2 is moved in accordance with the direction of sunlight, but the front and back surfaces of the solar cell panel 1 are supported in a direction perpendicular to the installation surface. However, the light can be guided to some extent on the front and back surfaces of the solar cell panel 1 only by providing the reflection plates 2 for guiding the light on the front and back surfaces, respectively.

In the above embodiment, the solar cell panel 1
11 are supported vertically in the direction perpendicular to the ground plane.
In the fourth embodiment shown in FIG. 12, when a solar cell panel 1 is supported in parallel with a ground plane, a reflector 2 for efficiently guiding sunlight to the back side is provided. Is to move the reflector 2 following the direction of the sun in the same manner as in the above-described embodiment.

The moving means of the reflecting plate of the fourth embodiment has the same construction as that of the first embodiment. That is, the solar cell panel 1 is fixed to the support base 30 by the support shaft 31 and the support member 32, and the solar cell panel 1 is supported in parallel with the ground plane.

The supporting base 30 has a reflecting plate 2 having an arc-shaped cross section.
a and 2b are attached to the support base 30 by a hinge 35 so as to be rotatable (swingable). This reflection plate 2a,
An urging spring 34a for urging the reflectors 2a, 2b toward the solar cell panel 1, ie, urging in the direction of arrow A in the figure, between the arm 2b and the arms 33a, 33b provided on the base 30. ,
34b are provided. Although not shown, a stopper for stopping the reflection plates 2a and 2b at predetermined positions is provided.

Further, the reflecting plates 2a, 2b and the arms 33a, 3a
3b between the biasing means 36 and 3 made of a shape memory alloy.
7 are provided. Urging means 3 for the reflection plates 2a and 2b
6, 37 are connected by hooks 36b, 37b. Shape memory alloy portions 36a, 37 of the urging means 36, 37
a is configured to contract when the temperature rises.
The temperature at which the shape memory alloy portions 36a and 37a start to contract is determined in consideration of the position, direction, area, and the like where the solar cell device is set. For example, when the urging means 37 is east, The shape memory alloy portion 36a may have a higher shrinkage start temperature than the shape memory alloy portion 37a. When the solar cell panel 1 is installed in the east-west direction, the shape memory alloy part of the biasing means located on the upper side has a higher shrinkage start temperature than the shape memory alloy part located on the lower side. I just need.

In the solar cell device of the above-described embodiment, the amount of light that strikes the urging means 36 and 37 differs depending on the angle of incidence of the sun. For example, when light is not applied to both sides, such as at night, the shape memory alloy portions 36a, 3a
7a, the temperature does not rise and the shape memory alloy portions 36a, 37b
Is relaxed, and the reflecting plates 2a and 2b are rotated in the direction of arrow A in the figure by the urging forces of the urging springs 34a and 34b, and are held in a predetermined position by a stopper (not shown) as shown in FIG. Become.

When sunlight is irradiated from the left side in the figure as in the morning, the urging means 37 is irradiated with sunlight.
The urging means 36 is not irradiated with light due to the shadow of the reflection plate 2a. The biasing member 37 made of a shape memory alloy is irradiated with the light.
Temperature changes. Shape memory alloy part 3 by light irradiation
7a is heated to a predetermined temperature or higher, the shape memory alloy portion 3
7a is contracted, the reflecting plate 2b opens against the urging force of the urging spring 34b, and guides sunlight efficiently to the rear surface side of the solar cell panel 1.

The shape memory alloy portion 36 of the urging means 36
In a, since the shaded state continues, the temperature does not rise and remains relaxed, and the reflecting plate 2a is kept in contact with the stopper by the biasing spring 34a.

Subsequently, when the sunlight reaches the middle of the south, the urging means 37 also enters the shadow by the reflection member 2b, and the urging means 3
The temperature of the shape memory alloy part 37a of FIG. Then, when the temperature of the shape memory alloy portion 37a becomes equal to or lower than the contraction temperature, the shape memory alloy portion 37a relaxes. When the shape memory alloy portion 37b is relaxed, the reflecting plate 2b is pressed by the biasing spring 34b.
Rotates, and the reflection plate 2b contacts the stopper, and returns to the state shown in FIG. Further, since the shape memory alloy portion 36a of the urging means 36 remains shaded, the temperature does not rise and remains relaxed, and the reflecting plate 2a is kept in contact with the stopper by the urging spring 34a.

The shape of the reflectors 2a and 2b is such that light is efficiently guided to the back surface of the solar cell panel 1 when sunlight is in the middle of the south, from the viewpoint of power generation efficiency. preferable. Therefore, in the fourth embodiment, when the reflectors 2a, 2b are positioned in a shape opposite to the solar cell panel 1, the solar cells are connected via the reflectors 2a, 2b. The shapes of the reflection plates 2a and 2b are determined so that light is guided to the back surface of the panel 1 without waste.

Then, in the evening, when the sunlight is irradiated from the right side in the figure, the urging means 36 is irradiated with the sunlight, but the urging means 37 is irradiated with the shadow of the reflecting plate 2. Not done. The irradiated light causes a change in the temperature of the biasing member 36 made of a shape memory alloy. When the shape memory alloy portion 36a is heated to a predetermined temperature or higher by light irradiation, the shape memory alloy portion 36a contracts, the reflecting plate 2a opens against the urging force of the urging spring 4a, and the sunlight is efficiently radiated by the solar cell. Guide to the back of panel 1.

The shape memory alloy part 37 of the urging means 37
In a, since the shaded state continues, the temperature does not rise and remains relaxed, and the reflecting plate 2b is kept in contact with the stopper by the biasing spring 4b.

With the above configuration, the reflecting plate can be moved in accordance with the irradiation angle of the sun's light, so that the light can be efficiently applied to the back surface of the solar cell panel provided with the dual-incident solar cell element. Can be incident.

In the fourth embodiment, the reflection plate 2 is configured to open and close the reflection members 2a and 2b independently. However, the reflection plate 2 is different from the second and third embodiments. Similarly, the reflection plate 1 and the solar cell panel 1 may be configured to move integrally.

The fifth embodiment shown in FIGS. 13 and 14 is directed to a solar cell device in which a solar cell panel 1 is supported in parallel with a ground plane.
b, 2c, and 2d, and each of the four reflecting members 2
a, 2b, 2c, and 2d are configured to open and close according to the state of irradiation of sunlight.

The solar cell panel 1 is fixed to the support base 40 by a support member, and the solar cell panel 1 is supported in parallel with the ground plane. Four reflecting plates 2a, 2b, 2c, and 2d having an arc-shaped cross section are attached to the support base 40 so as to be rotatable (swingable) with respect to the base 40 by hinges (not shown). Between the reflectors 2a, 2b, 2c, 2d and the arm 41 provided on the base 40, the reflectors 2a, 2b
The urging spring 42 which urges the solar cell panel 1 side is provided. Although not shown, a stopper for stopping the reflection plates 2a and 2b at predetermined positions is provided.

Further, urging means 43 made of a shape memory alloy are provided between the reflectors 2a and the arm portion 41. The reflecting plates 2a and the urging means 43 are connected by hooks 43b. The shape memory alloy portion 43a of the urging means 43 is configured to contract when the temperature rises. It should be noted that the temperature at which the shape memory alloy portions 43a start contracting may be determined in consideration of the position, direction, area, and the like where the solar cell device is set.

In the above-described solar cell device, the amount of light that strikes the urging means 43 attached to the reflecting members 2a differs depending on the angle of incidence of the sun. Light is applied to the urging means 43 depending on the direction of the sun, and the urging member 43
When the shape memory alloy portion 43a is heated to a predetermined temperature or higher, the shape memory alloy portion 43a contracts, the reflection plate opens against the urging force of the urging spring 42, and guides sunlight efficiently to the back surface of the solar cell panel 1. .

With the above configuration, the four reflectors 2a can be moved independently of each other in accordance with the irradiation angle of the sun's light. Light can be efficiently incident on the back surface of panel 1.

In the above description, a solar cell element having a HIT structure has been described as an example of a dual-incidence solar cell element. The present invention can be applied even if it is configured.

[0087]

As described above, according to the present invention, the reflector can be moved in accordance with the irradiation angle of the sun light, so that the surface of the solar cell panel having the dual-incident solar cell element can be moved. Light can be efficiently incident on the back surface.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing a schematic configuration of a solar cell device according to a first embodiment of the present invention.

FIG. 2 is a schematic diagram showing a schematic configuration of a solar cell device according to the first embodiment of the present invention.

FIG. 3 is a schematic diagram showing a schematic configuration of a solar cell device according to the first embodiment of the present invention.

FIG. 4 is a schematic diagram showing a schematic configuration of a solar cell device according to the first embodiment of the present invention.

FIG. 5 is a schematic diagram showing a schematic configuration of a solar cell device according to a second embodiment of the present invention.

FIG. 6 is a schematic diagram showing a schematic configuration of a solar cell device according to a second embodiment of the present invention.

FIG. 7 is a schematic diagram illustrating a schematic configuration of a solar cell device according to a second embodiment of the present invention.

FIG. 8 is a schematic diagram showing a schematic configuration of a solar cell device according to a second embodiment of the present invention.

FIG. 9 is a schematic diagram showing a schematic configuration of a solar cell device according to a third embodiment of the present invention.

FIG. 10 is a schematic configuration diagram illustrating a solar cell device configured to move a reflector according to a seasonal solar altitude.

FIG. 11 is a perspective view showing a schematic lattice of a solar cell device according to a fourth embodiment of the present invention.

FIG. 12 is a schematic diagram illustrating a schematic configuration of a solar cell device according to a fourth embodiment of the present invention.

FIG. 13 is a perspective view showing a schematic lattice of a solar cell device according to a fifth embodiment of the present invention.

FIG. 14 is a schematic diagram showing a schematic configuration of a solar cell device according to a fifth embodiment of the present invention.

FIG. 15 is a schematic cross-sectional view showing an example of a solar cell element configured to make light incident from the front and back.

FIG. 16 is a schematic cross-sectional view showing a solar cell roof material using a conventional dual-incidence type solar cell element.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Solar cell panel 2 Reflector 4a, 4b Urging spring 6, 7 Urging means

Claims (5)

[Claims] 1. A solar cell panel having a solar cell element capable of generating power by light from the front and back surfaces is supported such that the front and back surfaces are perpendicular to an installation surface, and light is reflected on the solar cell panel. A solar cell device provided with a reflecting member for causing the solar cell device to emit light. 2. The solar cell device according to claim 1, wherein the reflection member moves in the direction of the sun. 3. The solar cell device according to claim 2, wherein the means for moving the reflection member starts operating in accordance with the amount of irradiation of sunlight. 4. A solar cell panel having a solar cell element capable of generating power by light from the front and back surfaces is supported so that the front surface is parallel to the installation surface, and reflects light to the solar cell panel. A solar cell device comprising a reflecting member, wherein the reflecting member moves in the direction of the sun. 5. The solar cell device according to claim 4, wherein the means for moving the reflection member starts operating in accordance with the irradiation amount of sunlight.