JP2013004819A - Solar cell panel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the flexibility for forming patterns without deteriorating the generating efficiency in a solar cell panel including a number of light transmissive type solar cell modules having different opening ratios and forming the patterns with the different opening ratios.SOLUTION: A solar cell panel has a first small module group, a second small module group, and a third small module group, which respectively include three solar cell modules 1 parallely connected and assembled from a top part to form three tiers. The first small module group, the second small module group, and the third small module group are serially connected, and the sums of the opening ratios of the solar cell modules 1 included in each small module group are equivalent.

Description

  The present invention relates to a solar cell panel in which transmissive solar cell modules that transmit part of light to the back surface side are arrayed in the vertical and horizontal directions.

Solar cell panels are generally configured in an array by arranging solar cell modules in the vertical and horizontal directions. One type of solar cell panel is an array of transmissive solar cell modules that transmit part of the light to the back side. There is a solar cell panel.
In many cases, such a solar cell panel using a transmission type solar cell module is installed on a roof or a window in such a state that the back surface can be seen from the inside. There is an advantage that outside light can be taken in.

  In addition, as disclosed in Japanese Patent No. 3746411, such a solar cell panel can change the color depending on the part on the back side of the solar cell panel by coloring the back surface of each solar cell module with an arbitrary color. In addition, even in the case of a solar module with the same color by changing the aperture ratio of each solar cell module, the brightness (or color intensity) is changed depending on the part on the back side of the solar cell panel (the aperture ratio The larger the is, the greater the amount of external light that is transmitted, so that the brightness can be increased (the color is lighter). Therefore, since such a solar cell panel can draw arbitrary patterns, such as a character and a picture, on the back surface of the solar cell panel which a person sees, it can be excellent in aesthetics. It is also possible to carry out advertisements or the like.

By the way, the solar cell panel disclosed in Japanese Patent No. 3746411 is such that solar cell modules having the same aperture ratio are connected in series as a group of solar cell modules, and the solar cell modules are connected in parallel. Yes.
This is because the solar cell modules with different aperture ratios have different operating currents, and connecting them in series causes the operating point of each solar cell module to deviate from the maximum operating point, reducing power generation efficiency. This is because, when solar cell modules having different operating currents are connected in series, it cannot be said that there is no possibility that the energy that cannot be flowed becomes heat and becomes a dangerous state.

The solar cell module disclosed in Japanese Patent No. 3746411 is highly effective in that an arbitrary pattern such as letters and pictures can be drawn on the back surface of the solar cell panel and the power generation efficiency of the solar cell module can be achieved. .
However, it cannot be said that this solar cell panel has no points to be improved.
That is, in the above-mentioned solar cell panel, there is a restriction that the solar cell modules having the same aperture ratio connected in series are connected as a group of solar cell modules in parallel. This means that there are restrictions. Moreover, even if it is possible to connect solar cell modules having the same aperture ratio in series and connect them in parallel, depending on the arrangement of the solar cell modules having the same aperture ratio, the wiring is long. There is no possibility of becoming congested or congested.

  The present invention is a solar cell panel in which a transmissive solar cell module that transmits a part of light to the back surface side is arranged in the vertical and horizontal directions, and an arbitrary pattern such as a character, a picture, etc. An object of the present invention is to improve what can draw both the power generation efficiency of the solar cell module so that the degree of freedom in drawing a pattern can be further increased.

In order to solve the above-mentioned problems, the present inventor proposes the following invention.
The present invention is a transmissive solar cell module that transmits a part of light to the back side, and is arranged in an array by arranging a number of solar cell modules having the same power generation capacity in the vertical and horizontal directions when the influence of the aperture ratio is not considered It is the solar cell panel formed by arrangement.
And many solar cell modules of this solar cell panel include at least one solar cell module, and when including a plurality of the solar cell modules, small module groups in which they are connected in parallel to each other are connected in series. A module group is configured to be connected, and at least one of the small module groups includes a plurality of the solar cell modules, and each of the small module groups includes the sun included therein. The sum of the aperture ratios of the battery modules is made equal.
This solar cell panel includes a large number of solar cell modules, and the large number of solar cell modules may include those having different aperture ratios, so that an arbitrary pattern such as a character or a picture can be drawn on the back surface thereof. It will be possible.
In addition, a large number of the solar cell modules of the solar cell panel include a module group in which a small module group including at least one solar cell module is connected in series. The solar cell module included in each small module group The sum of the aperture ratios is equal to each other. In this solar cell panel, as long as the sum of the aperture ratios of the solar cell modules included in each small module group is the same, it is possible to arbitrarily assign an aperture ratio to a plurality of solar cell modules in each small module group Therefore, the degree of freedom in drawing a pattern can be increased as compared with the conventional case. In addition, the difference in the aperture ratio of the solar cell modules included in each small module group does not cause a problem as long as they are connected in parallel even if a plurality of solar cell modules are included in the small module group. Since the sum of the aperture ratios of the solar cell modules included in each small module group is the same, there will be no deviation in the operating point of each small module group. As a result, the power generation efficiency of the solar cell module is reduced. There is no drop.

The small module group in the present invention includes at least one solar cell module, and when including a plurality of the solar cell modules, they are connected in parallel to each other. That is, one or more solar cell modules may be included in each small module group.
When one of the small module groups includes a plurality of the solar cell modules, all the solar cell modules included in the small module group may have the same aperture ratio, or the sun included in the small module group. At least one of the battery modules may have a different aperture ratio from other solar cell modules. The fact that either case can be adopted increases the degree of freedom of the present invention, but the latter case is more useful for drawing a more varied pattern. Even in the latter case, the solar cell modules included in the same small module group are not prevented from having the same aperture ratio.

  One or more solar cell modules may be included in each small module group. The number of solar cell modules included in each small module group may be a plurality of the same number. One of the small module groups may be configured such that the number of the solar cell modules included in the small module group is different from the number of the solar cell modules included in the other small module group. If the former, it is easy to make the wiring regular, and undesirable heat generation can be avoided without particularly considering the difference in the amount of current flowing between the small module groups connected in series. The latter is useful for drawing a more varied pattern.

The module group included in the solar cell panel of the present application may be one or plural. When there are a plurality of module groups, the module groups can be connected in parallel to each other.
A solar cell panel including a plurality of module groups can further increase the degree of freedom in drawing a pattern.
In the solar cell panel including a plurality of module groups, the sum of the aperture ratios of the solar cell modules in each of the small module groups included in at least one of the module groups is the same as that of the small module groups included in the other module groups. It may be different from the sum of the aperture ratios of the solar cell modules in each. By changing the sum of the aperture ratios of the solar cell modules in the small module groups included in each module group, the degree of freedom in drawing a pattern can be increased, and a variety of patterns can be drawn. .

The perspective view which shows the whole structure of the one aspect | mode of the solar cell panel by embodiment of this invention. FIG. 2 is an enlarged step view showing a configuration of a solar cell module included in the solar cell panel shown in FIG. 1. The figure which shows notionally the connection state by the cable of the solar cell module contained in the solar cell panel shown in FIG. The figure which shows notionally the other connection state by the cable of the solar cell module contained in the solar cell panel shown in FIG.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a perspective view of a solar cell panel.
The solar cell panel includes a large number of solar cell modules 1, and each solar cell module 1 includes a large number of solar cells 11.
The solar battery cell 11 is a solar battery itself that performs solar power generation, and may be a well-known one.
Although not limited to this, in this embodiment, as shown in FIG. 2, the solar battery cell 11 can transmit light onto a transparent substrate 111 that is a rectangular glass plate, for example. The first intermediate film layer 112 that is an adhesion layer formed of a synthetic resin or the like, the photoelectric conversion element portion 113 that is a semiconductor that performs photoelectric conversion, and the photoelectric conversion layer 117 that is a layer formed by the opening 116 (the photoelectric conversion layer 117 is The photoelectric conversion element portion 113 may be formed by directly depositing on the transparent substrate 111 instead of the intermediate film layer 112.), and also formed of, for example, a synthetic resin that can transmit light. The second intermediate film layer 114, which is an adhesion layer, is laminated in this order. The first intermediate film layer 112 and the second intermediate film layer 114 are not necessarily limited to this, but in this embodiment, have the same size and shape as the substrate 111. The photoelectric conversion layer 113 does not cover the entire area of the substrate 111 and is divided according to circumstances.
The solar battery cells 1 are gathered together in a state where appropriate numbers are arranged vertically and horizontally, and the surface on the second intermediate film layer 114 side is sealed with a sealing plate 115 which is also a transparent rectangular glass plate. Has been.
The solar cell 11 that is united by the sealing plate 115 is the solar cell module 1.

Since the solar cell module 1 receives sunlight from the substrate 111 side, the substrate 111 side is the front and the sealing plate 115 side is the back.
The substrate 111, the first intermediate film layer 112, the second intermediate film layer 114, and the sealing plate 115 all transmit light, but the photoelectric conversion element portion 113 of the photoelectric conversion layer 117 does not transmit substantially light. Therefore, in the solar cell module 1 in a plan view, a portion where the photoelectric conversion element portion 113 of the photoelectric conversion layer 117 does not exist is set as the opening portion 116, so that light can be transmitted through the portion of the opening portion 116. it can. The ratio occupied by the opening 116 in the photoelectric conversion layer 117 in plan view is the opening ratio of the solar cell module 1. In this embodiment, the aperture ratio is selected from 1% to 50% considering that the power generation capacity of the solar cell module is reduced when the aperture ratio is excessive.
Each solar cell module 1 has an aperture ratio in the above-described range, and the power generation capacity varies depending on the aperture ratio, but the power generation capacity when the influence of the aperture ratio is not considered is the same.

  The first intermediate film layer 112 and the second intermediate film layer 114 of each solar battery cell 11 are connected by a conductor (not shown), and the electric power generated by each solar battery cell 11 is collected by the conductor. Can be output. In addition, each solar cell module 1 is provided with terminals (not shown) on the input side and the output side for connection to other solar cell modules 1 or external devices, and other solar cell modules 1 or external devices FIG. 1 is connected by a cable not shown.

An appropriate number of the solar cell modules 1 described above are arranged in the vertical and horizontal directions, and the solar cell modules are grouped into a solar cell panel.
Any method may be used for collecting the solar cell modules 1 into a solar cell panel, and a known method may be used. In this embodiment, the solar cell modules 1 are grouped together by using a sash 12 that can connect adjacent solar cell modules 1 to each other. Further, the outer periphery of the solar cell panel is also surrounded by the sash 12. The cable described above is passed through the sash 12 so as not to be exposed to the outside.

Next, a connection method of the solar cell module 1 using the above-described cable is schematically shown in FIG. Note that the solar cell module 1 shown in FIG. 3 is only a part of the solar cell module 1 included in the solar cell panel, and the other solar cell modules 1 are connected in accordance with those shown in FIG. be able to.
In this embodiment, the uppermost three solar cell modules 1, the third three solar cell modules 1, the third three solar cell modules 1 are connected in parallel by cables 2, respectively. Yes.
The three solar cell modules 1 at each stage thereby form the small module group of the present application. These will be referred to as a first small module group, a second small module group, and a third small module group from the top for convenience, and these correspond to the small module group in the present invention.
It is not always necessary to do so, but in this embodiment, there are a plurality of solar cell modules 1 included in each of the small module groups, and the same number.
The first small module group, the second small module group, and the third small module group are connected in series. The module group referred to in the present invention is configured by connecting the first small module group, the second small module group, and the third small module group in series. The upper end cable 2 is connected to an external device (not shown).

The three solar cell modules 1 included in the first small module group all have the same aperture ratio and an aperture ratio of 15% in this embodiment. And the sum of the aperture ratios of the three solar cell modules 1 included in the first small module group is 45%.
In this embodiment, the aperture ratios of the three solar cell modules 1 included in the second small module group are the same, the two from the left having an aperture ratio of 5%, and the rightmost one having an aperture ratio of 15%. And the sum of the aperture ratios of the three solar cell modules 1 included in the second small module group is 45% as in the case of the first small module group.
The three solar cell modules 1 included in the third small module group are all different in this embodiment, and are 10%, 12%, and 23% from the left. The sum of the aperture ratios of the three solar cell modules 1 included in the third small module group is 45% as in the case of the first small module group and the second small module group.
Thus, the solar cell modules 1 included in each small module group may all have the same aperture ratio, all may have different aperture ratios, some of which have the same aperture ratio and others have different aperture ratios. It may be.
However, the sum of the aperture ratios of the solar cell modules 1 included in each small module group is all equal in each small module group. Of course, the sum of the aperture ratios is not limited to 45%.

As described above, the solar cell panel having the solar cell module 1 connected by the cable 2 can draw various patterns on the back surface thereof with a high degree of freedom due to the difference in the aperture ratio of the solar cell module 1.
Moreover, since the sum of the aperture ratios of the solar cell modules 1 included in each small module group is the same in each small module group, the operating point does not shift when viewed from each small module group. The solar cell module 1 included in the module group generates power with the maximum operating efficiency.
Furthermore, when the number of solar cell modules in each small module group is plural and the same number, undesirable heat generation can be avoided without particularly considering the difference in the amount of current flowing between the small module groups connected in series. it can.

Next, another connection method of the solar cell module 1 using the above-described cable is schematically shown in FIG. Note that the solar cell module 1 shown in FIG. 4 is only a part of the solar cell module 1 included in the solar cell panel, and the other solar cell modules 1 are similar to those shown in FIG. 3 and FIG. Can be connected.
The other connection method of the solar cell module 1 shown in FIG. 4 using the above-described cable is not significantly different from that shown in FIG.
FIG. 4 shows two module groups on the left and right sides according to the present invention. For convenience, the right module group in FIG. 4 is called the right module group, and the left module group is called the right module group.

The right module group includes solar cell modules 1 connected as follows. The uppermost stage includes three solar cell modules 1 connected in parallel. The second stage includes two solar cell modules 1 connected in parallel. The third level includes one solar cell module 1.
The solar cell module 1 at each stage is thereby a small module group of the present application. These will be referred to as a right first small module group, a right second small module group, and a right third small module group from the top for convenience.
It is not always necessary to do so, but in this embodiment, the numbers of the solar cell modules 1 included in the right first small module group, the right second small module group, and the right third small module group are all different. .
The right first small module group, the right second small module group, and the right third small module group are connected in series. The cable 2 at the upper end of the right module group is connected to an external device (not shown).

The three solar cell modules 1 included in the right first small module group all have the same aperture ratio and an aperture ratio of 15% in this embodiment. And the sum of the aperture ratios of the three solar cell modules 1 included in the right first small module group is 45%.
In this embodiment, the two solar cell modules 1 included in the right second small module group have an aperture ratio of 15% and 30% from the left, and the sum of the aperture ratios is the same as in the right first small module group. 45%.
The solar cell module 1 included in the right third small module group is one, and the aperture ratio thereof is 45% as in the case of the right first small module group and the right second small module group.
Thus, the solar cell modules 1 included in each small module group may all have the same aperture ratio, all may have different aperture ratios, some of which have the same aperture ratio and others have different aperture ratios. It may be.
Moreover, although the number of the solar cell modules 1 contained in each small module group may be the same, it may differ in this way. That is, in one of the small module groups, the number of solar cell modules 1 included therein may be different from the number of solar cell modules 1 included therein. However, even in such a case, each small module group may include the same number of solar cell modules 1 included therein.

The left module group includes solar cell modules 1 connected as follows. The uppermost stage includes three solar cell modules 1 connected in parallel. The second stage includes four solar cell modules 1 connected in parallel. The third stage includes five solar cell modules 1 connected in parallel.
The solar cell module 1 at each stage is thereby a small module group of the present application. These will be referred to as a left first small module group, a left second small module group, and a left third small module group from the top for convenience.
The numbers of the solar cell modules 1 included in the left first small module group, the left second small module group, and the left third small module group are all different.
The left first small module group, the left second small module group, and the left third small module group are connected in series. The cable 2 at the upper end of the left module group is connected to an external device (not shown). That is, the right module group and the left module group are connected in parallel to a predetermined external device.

The three solar cell modules 1 included in the left first small module group all have the same aperture ratio and an aperture ratio of 20% in this embodiment. And the sum of the aperture ratios of the three solar cell modules 1 included in the left first small module group is 60%.
In this embodiment, the four solar cell modules 1 included in the left second small module group have an aperture ratio of 35%, 5%, 5%, and 15% from the left, and the sum of the aperture ratios is the left first small module. It is 60% as in the case of the module group.
The solar cell module 1 included in the left third small module group is five, and in this embodiment, the aperture ratio is 16%, 12%, 10%, 10%, and 12% from the left. The sum of the rates is 60% as in the case of the left first small module group and the left second small module group.

The solar cell panel having the solar cell module 1 connected by the cable 2 as described above has a right module group and a left module group having different sums of aperture ratios, and therefore, compared with a case where there is only one module group. Therefore, it is possible to draw various patterns on the back side with a higher degree of freedom.
Moreover, since the sum of the aperture ratios of the solar cell modules 1 included in each small module group is the same in each small module group in both the right module group and the left module group, the solar cell modules 1 included in each small module group are It will generate electricity with maximum operating efficiency.
In this example, there are two module groups, a right module group and a left module group, but it is natural that the number of module groups may be larger. Further, in this example, the sum of the aperture ratios of the solar cell modules 1 included in the small module groups in the right module group and the left module group was different from 45% and 60%, but this may be the same. Of course, the sum of the aperture ratios is not limited to 45% and 60%.
However, in this example, since the sum of the areas of the photoelectric conversion element portions 113 proportional to the energization capacity in each solar cell module 1 in each small module group constituting the module group differs depending on each small module group. A small module group (this is synonymous with a small solar cell module group with a small number of solar cell modules 1) whose sum of the areas of the conversion element portions 113 is smaller than the others becomes a resistance, causing problems such as a reduction in efficiency. There is a possibility. In order to cause the solar cell module 1 included in each small module group to generate power at the maximum operating efficiency and avoid problems such as efficiency reduction, each of the small module groups is included in the solar cell module included in them. As described above, when the number of 1 is plural and the number is equal, not only the sum of the aperture ratios but also the sum of the energization capacities may be made the same among the small modules.

DESCRIPTION OF SYMBOLS 1 Solar cell module 2 Cable 11 Solar cell 12 Sash 111 Substrate 112 1st intermediate film layer 113 Photoelectric conversion element part 114 2nd intermediate film layer 115 Sealing board 116 Opening part 117 Photoelectric conversion layer

Claims (6)

It is a transmissive solar cell module that transmits part of the light to the back side, and is arranged in an array by arranging a number of solar cell modules with the same power generation capacity in the vertical and horizontal directions when the influence of the aperture ratio is not considered A solar panel,
A large number of the solar cell modules include at least one solar cell module, and in the case of including a plurality of the solar cell modules, they are connected in parallel to each other, and a module group formed by serially connecting small module groups As it is configured,
At least one of the small module groups includes a plurality of the solar cell modules, and each of the small module groups is configured such that the sum of the aperture ratios of the solar cell modules included therein is equal.
Solar panel. One of the small module groups includes a plurality of the solar cell modules, and at least one of the solar cell modules included in the small module group has a different aperture ratio from other solar cell modules. Yes,
The solar cell panel according to claim 1. One of the small module groups is such that the number of the solar cell modules included therein is different from the number of the solar cell modules included in the other small module groups.
The solar cell panel according to claim 1. Each of the small module groups includes a plurality of the solar cell modules included therein, and the same number.
The solar cell panel according to claim 1. Including a plurality of the module groups connected in parallel to each other;
The solar cell panel according to claim 1. The sum of the aperture ratios of the solar cell modules in each of the small module groups included in at least one module group is the sum of the aperture ratios of the solar cell modules in each of the small module groups included in the other module groups. Has become different,
The solar cell panel according to claim 5.

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