JP2001267595A - Solar cell module - Google Patents

Abstract

(57) [Problem] To provide a solar cell module having a new structure for connecting solar cells in series, thereby improving the production yield. SOLUTION: A vertical projection surface of a “light pole side connection terminal” of one solar cell 1 (one end of the light-transmitting substrate 11 in the left direction in the drawing) is set to a “counter electrode side connection terminal” of the other solar cell 1. At least two or more solar cells 1 are arranged while being superimposed on (one end of the conductive substrate 17 in the right direction of the drawing), and the “light electrode side connection terminal” of one of the solar cells 1 (left side of the drawing) One end of the light-transmitting substrate 11 in one direction) and one end of the conductive substrate 17 in the “counter electrode connection terminal” of the other solar cell 1 (rightward in the drawing) by the S-shaped connection fitting 2. By making the connections, each of the solar cells 1 is connected in series.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a solar cell module in which solar cells are connected in series.

[0002]

2. Description of the Related Art Conventionally, in a solar cell module, as shown in FIGS. 10 and 11, for example, collector wires 104 are provided on both surfaces of a solar cell 105 where a PN junction boundary surface is formed. As a result, the transfer of electrons generated by the photoelectric effect is efficiently performed.

[0003] Further, each of the solar cells 105 (hereinafter, referred to as “solar cell 101”) provided with the current collector 104 is connected in series via a metal conductive foil 102. In particular, the metal conductive foil 102 is connected to the current collector 104 on the upper surface side of one of the "solar cells 101" by the solder 103.
To the current collector 104 on the lower surface side of the other "solar cell 101". Note that such a connection method is described or suggested in, for example, Japanese Patent Application Laid-Open Nos. 7-13049, 8-330615, and 9-55531.

Then, the "solar cell 10" connected in series
As shown in FIG. 12, each of "1" is sandwiched between light-transmitting resin films 107 such as EVA, and further, a light-transmitting substrate 106 such as flat glass is provided on the upper surface thereof as an incident light side. While stacking, the lower surface is ET
After laminating a moisture-proof film 108 such as an FE film or a PCTFE film, it is completely adhered by a vacuum heat-sealing press.
By being sealed, the solar cell module 110
Becomes

[0005]

However, on the surface of the solar cell 105, from the viewpoint of mounting efficiency,
In order to arrange the current collecting wire 104, the metal conductive foil 102, the solder 103, and the like so as to have as small an area as possible, local irregularities are always formed. In addition, the solar cell 10
5 is not strictly flat and generally has some warpage. Further, the solar cell 105 and the metal conductive foil 102
Are weak to bending loads because they are as thin as several hundred μm.

Therefore, after lamination as shown in FIG.
When completely adhered and sealed by a vacuum heat sealing press, very large stress is generated in local uneven portions in the solar cell 105 which is a brittle material.
Or the metal conductive foil 102 may be broken.

Further, the metal conductive foil 102 attached to each of the current collector wires 104 of the “solar cell 101”
, The solar cell 105 may be destroyed by the thermal stress of soldering.

That is, as long as each of the “solar cells 101” in the solar cell module 110 is connected by the structure shown in FIGS. Since breakage cannot be avoided and these are the main causes of lowering the yield, development of a new structure for connecting each of the "solar cells 101" has been desired.

The present invention has been made in order to solve the above-mentioned problems, and has a new structure for connecting each of the solar cells in series, thereby improving the production yield. It is an object to provide a battery module.

[0010]

Means for Solving the Problems According to a first aspect of the present invention, there is provided a solar cell module having a portion in which at least two or more solar cells are connected in series, Each of the solar cells has a solar cell having a light pole and a counter electrode, a light-transmitting substrate electrically connected to the light pole side of the solar cell via a transparent conductive film, and the light-transmitting substrate A light electrode side connection terminal projecting in a predetermined direction with respect to the solar cell, a conductive substrate electrically connected to a counter electrode side of the solar cell, and one end of the conductive substrate And a counter electrode connection terminal projecting in the opposite direction with respect to the solar cell, wherein the vertical projection surface of the light electrode side connection terminal of one of the solar cells is the counter electrode side of the other solar cell. Superimposed on the connection terminal With placing each of Luo solar cell is characterized by, electrically connected at one solar cell of the light pole side connection terminal and the other solar cell of the counter electrode side connection terminal and the connection means.

The solar cell module of the present invention having such features has a solar cell in which at least two or more are connected in series. In the solar cell, the light-transmitting substrate is electrically connected to the light-electrode side of the solar cell via a transparent conductive film, and the conductive substrate is electrically connected to the opposite electrode of the solar cell. Have been.
Further, in the solar cell, on the light pole side of the solar cell, one end of the light-transmitting substrate protrudes in a predetermined direction as a light pole side connection terminal, and on the counter electrode side of the solar cell, a counter electrode side connection terminal. One end of the conductive substrate protrudes in a direction opposite to the predetermined direction. Therefore, in the solar cell, the light pole side connection terminal and the counter electrode side connection terminal are provided symmetrically at diagonal positions centering on the solar cell.

Therefore, when the solar cells are arranged in series so as to be connected in series, the vertical projection surface of the light-electrode-side connection terminal of one solar cell is overlapped with the counter-electrode-side connection terminal of the other solar cell. They can be arranged together. By electrically connecting the light-electrode-side connection terminal of one of the solar cells and the counter-electrode-side connection terminal of the other solar cell by the connection means, each of the solar cells can be easily connected in series.

Here, for convenience of explanation, the light pole side of the solar cell is "upward", and the counter electrode side of the solar cell is "downward".
Then, the light-electrode-side connection terminal of the solar cell is one end of the light-transmitting substrate and protrudes from the solar cell in a predetermined direction. However, it does not exist directly above or directly below the solar cell. In addition, since the counter electrode connection terminal of the solar cell is one end of the conductive substrate and protrudes from the solar cell in the opposite direction, the counter electrode connection terminal of the solar cell is directly above / below the solar cell. Never exist. Therefore, directly above and below the solar cell,
In order not to form local unevenness by the connection means,
Each of the solar cells can be connected in series.

That is, in the solar cell module of the present invention, one end of the translucent substrate projecting in a predetermined direction on the light pole side of the solar cell is used as a light pole side connection terminal, and on the opposite electrode side of the solar cell. By using one end of the conductive substrate projecting in the opposite direction as the counter electrode connection terminal, the light electrode side connection terminal and the counter electrode side connection terminal are provided symmetrically at diagonal positions around the solar cell. Having a solar cell, arranging at least two or more solar cells while overlapping the vertical projection surface of the light-electrode-side connection terminal of one solar cell with the counter-electrode-side connection terminal of the other solar cell; Each of the solar cells can be easily connected in series by electrically connecting the light-electrode-side connection terminal of the solar cell and the counter-electrode-side connection terminal of the other solar cell by connecting means. This new connection structure has a new connection structure that allows each of the solar cells to be formed directly above and below the solar cells so that local unevenness is not formed by the connection means. Because it can be connected in series, when modularizing each of the solar cells connected in series, even if a mechanical load is applied to each of the solar cells, the distribution of stress generated in the solar cells Is uniform, thereby making it possible to prevent the solar cell from being destroyed. Therefore, it can be said that the solar cell module of the present invention has an improved yield during manufacturing.

In the solar cell module of the present invention, the transparent substrate is electrically connected to the light pole side of the solar cell via the transparent conductive film. It may be electrically connected to the photoelectrode side of the solar cell due to its conductivity. Further, the solar cell includes, for example, a crystalline cell, an amorphous (amorphous) cell, a compound cell, a thin film polycrystalline cell, a wet cell, an organic cell, and the like. Further, the conductive substrate may be a non-conductive substrate provided with a conductive film.

According to a second aspect of the present invention, there is provided a solar cell module having a portion in which at least two or more solar cells are connected in series. Are each electrically connected to a solar cell having a light pole and a counter electrode via a transparent conductive film and the light pole side of the solar cell, and are formed through a conductive film and a counter electrode side of the solar cell. A light-transmissive substrate that is electrically joined to the light-transmitting substrate, a light-electrode-side connection terminal that protrudes from the solar cell at one end of the light-transmitting substrate, And a counter electrode connection terminal projecting with respect to the solar cell, and a photovoltaic cell while facing the light pole side connection terminal of one solar cell and the counter electrode connection terminal of the other solar cell. Place each of Rutotomoni is characterized by, electrically connected at one solar cell of the light pole side connection terminal and the other solar cell of the counter electrode side connection terminal and the connection means.

The solar cell module of the present invention having such features has a solar cell in which at least two or more are connected in series. In the solar cell, the light pole side of the solar cell is electrically connected to the light transmitting substrate via the transparent conductive film, and the counter electrode side of the solar cell is electrically connected to the light transmitting substrate through the conductive film. Are joined. Further, in the solar cell, one end of the light-transmitting substrate protrudes from the solar cell as a light-electrode-side connection terminal, and the other end of the light-transmitting substrate serves as a counter-electrode-side connection terminal to the battery cell. It is protruding. Therefore, in the solar cell, the light-electrode-side connection terminal and the counter-electrode-side connection terminal are symmetrically provided at positions facing the light-transmitting substrate.

Therefore, when the solar cells are arranged in series so as to be connected in series, the light-electrode-side connection terminal of one solar cell and the counter-electrode-side connection terminal of the other solar cell are arranged facing each other. Can be done. By electrically connecting the light-electrode-side connection terminal of one of the solar cells and the counter-electrode-side connection terminal of the other solar cell by the connection means, each of the solar cells can be easily connected in series.

Since the light-electrode-side connection terminal of the solar cell is one end of the translucent substrate and protrudes from the solar cell, the light-electrode-side connection terminal of the solar cell is connected to the solar cell. It does not exist directly above or below.
Further, since the opposite connection terminal of the solar cell is the other end of the light-transmitting substrate and protrudes from the solar cell, the opposite connection terminal of the solar cell is directly above and below the solar cell. It does not exist. Therefore, each of the solar cells can be connected in series such that a local uneven portion is not formed directly above and below the solar cell by the connecting means.

That is, in the solar cell module of the present invention, one end of the translucent substrate protruding from the solar cell is used as a light pole side connection terminal, and the other end of the translucent substrate protruding from the solar cell is used. Is a counter electrode side connection terminal, having a solar cell in which the light pole side connection terminal and the counter electrode side connection terminal are provided symmetrically at a position facing the translucent substrate, and the light pole side of one of the solar cells At least two or more solar cells are arranged while facing the connection terminal and the counter electrode connection terminal of the other solar cell, and the light electrode side connection terminal of one solar cell and the counter electrode connection of the other solar cell. The new connection structure is provided with a simplified new structure in which each of the solar cells is easily connected in series by electrically connecting the terminal to the connection means. Immediately above and below the solar cells, each of the solar cells can be connected in series, so that a local uneven portion is not formed by the connecting means, so that each of the solar cells is connected in series When the module is formed, even if a mechanical load is applied to each of the solar cells, the distribution of the stress generated in the solar cells becomes uniform, which makes it possible to prevent the destruction of the solar cells. . Therefore, the solar cell module of the present invention,
It can be said that the yield in manufacturing is improved.

In the solar cell module of the present invention, one solar cell may be electrically connected to one translucent substrate, or two or more solar cells may be electrically connected. The joined parts may be electrically joined.
Further, the solar cell includes, for example, a crystalline cell, an amorphous (amorphous) cell, a compound cell, a thin film polycrystalline cell, a wet cell, an organic cell, and the like.

According to a third aspect of the present invention, which has been made to solve the above-described problem, in the solar cell module according to the first or second aspect, the connecting means may be:
It is a conductive metal clip sandwiching the light-electrode-side connection terminal of one solar cell and the counter-electrode-side connection terminal of the other solar cell. According to a fourth aspect of the present invention, in the solar cell module according to the first or second aspect, the connecting means includes a light pole side connection terminal of one solar cell and a counter electrode side connection terminal of the other solar cell. And a conductive adhesive filling the space.

In the solar cell module of the present invention having such features, when the solar cells are arranged in series to be connected in series, the light-electrode-side connection terminal of one solar cell and the counter-electrode side of the other solar cell. The connection terminals are vertically or horizontally adjacent to each other with a space interposed therebetween.

That is, in the solar cell module of the present invention, unlike the prior art, the connection means for electrically connecting the light-electrode-side connection terminal of one solar cell and the counter-electrode-side connection terminal of the other solar cell. The use of conductive metal clips and conductive adhesives makes it possible to avoid the use of metal conductive foil, thus freeing the solar cell from destruction due to thermal stress generated when soldering the metal conductive foil. At the same time, it is also free from the breakage of the metal conductive foil that occurs when the solar cell connected in series is modularized. In addition, since it is free from troubles such as breakage of metal conductive foil and peeling of soldered parts that occur when repeatedly receiving a load due to wind pressure etc. outdoors, the probability of failure occurrence decreases,
Reliability can be improved.

In the conventional technique, soldering of a metal conductive foil involves attaching one end of the metal conductive foil to the surface of one solar cell and attaching the other end of the metal conductive foil to the back surface of the other solar cell. However, the solar cell module of the present invention is also free from such a complicated operation (soldering of the metal conductive foil), which can contribute to simplification of the manufacturing process and reduction of the manufacturing cost. Furthermore, since the interval between each of the solar cells can be made shorter than the distance secured to cover the weakness of bending of the metal conductive foil, the so-called dead area is reduced and the mounting efficiency is improved. be able to.

In particular, when a conductive adhesive is used as a connecting means for electrically connecting the light-electrode-side connection terminal of one solar cell and the counter-electrode connection terminal of the other solar cell, a large number of solar cells are required. Since batteries can be connected at the same time, production efficiency can be significantly improved.
Furthermore, immediately above and below the solar cell, each of the solar cells can be connected in series so that a local uneven portion is not formed by the connection means, so that the distribution of stress generated in the solar cell is more. Become uniform.

According to a fifth aspect of the present invention, which has been made to solve the above-mentioned problem, in the solar cell module according to the third or fourth aspect, the solar cells are connected in series by the connection means. Are sealed with a translucent resin. According to a sixth aspect of the present invention, in the solar cell module according to the third or fourth aspect, each of the solar cells connected in series by the connection means is sandwiched by a translucent film and thermally fused. ,
It is characterized by.

That is, in the solar cell module of the present invention, as a connecting means for electrically connecting the light-electrode-side connection terminal of one solar cell and the counter-electrode-side connection terminal of the other solar cell, a conductive metal clip or a conductive metal clip is used. In the case of using a conductive adhesive, the solar cells connected in series have high dimensional maintainability, so the solar cells connected in series are sandwiched by a translucent film and heat-sealed. In addition, by encapsulating the solar cells connected in series with a translucent resin, the solar cells connected in series can be modularized.

[0029]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 2 is a cross-sectional view of a solar cell 1 which is a unit of the solar cell module according to the present embodiment.
FIG. 3 is a top view of the solar cell 1. As shown in FIG. 2, the solar cell 1 has a structure in which a solar cell 10, a light-transmitting substrate 11, a transparent conductive film 12, a conductive bonding portion 16, a conductive substrate 17, and the like are stacked.

The solar cell 10 is 100 mm × 100
mm, a thickness of several hundreds of μm, a P-type semiconductor light pole 14 installed on the side where light is incident (upper side in the figure), and the opposite side (lower side in the figure) The counter electrode 15 of the N-type semiconductor joined to the light pole 14 and the surface of the light pole 14 on the side where light is incident (upper side in the drawing) are coated with a conductive adhesive paste containing metal or carbon powder. It is composed of a screen-printed collector wire 13 and the like, and generates electrons and holes by the photoelectric effect at the boundary surface of the PN junction.

The light pole 14 and the counter electrode 15 may be replaced with a P-type semiconductor and an N-type semiconductor. In addition, since the current collector 13 shields light incident on the solar cell 10, it is desirable that the occupied area on the surface of the light pole 14 be as small as possible. It is preferable to use a silver-based material having a smaller value.

On the other hand, the translucent substrate 11 is 100 mm × 1
The transparent conductive film 12 is 25 mm in size, and the transparent conductive film 12 is formed on the surface to which the solar cells 10 are electrically joined. More specifically, ITO, which is a compound of indium oxide and tin oxide, is used as the transparent film electrode 12 to form the transparent substrate 11.
The transparent substrate 11 is chemically vapor-deposited on the transparent substrate 11 by a low-pressure plasma CVD method as a transparent conductive film 12 by sputtering or by doping tin oxide with fluorine. 12 is formed.

Then, the collector wire 13 screen-printed on the surface of the light pole 14 of the solar cell 10 is superposed on the transparent electroconductive film 12 formed on the translucent substrate 11 and is cured by heating. Since the transparent conductive film 12 and the current collector 13 are electrically connected, the light-transmitting substrate 11 and the solar cell 1
0 can be electrically connected via the transparent conductive film 12.

However, the transparent substrate 11 and the solar cell 10
In order to electrically connect the light-transmitting substrate 11 to the solar cell 10, a light-transmitting substrate 11 larger than the solar cell 10 is prepared, and as shown in FIG. 11
And one end of the translucent substrate 11 is protruded in a predetermined direction (left direction in the drawing) as a “light pole side connection terminal”.

In the solar cell 10, the conductive adhesive 16 is formed on the surface of the counter electrode 15 on the opposite side (the lower side in the drawing) to the side on which light is incident. Apply paste. At this time, if there is a need for patterning or if it is desired to ensure uniformity of the thickness, screen printing is used.

Then, when the conductive substrate 17 is superposed on the conductive bonding portion 16 formed on the surface of the counter electrode 15 of the solar cell 10 and cured by heating, the conductive bonding portion 1 is formed.
6 and conductive substrate 17 are electrically joined, so that solar cell 10 and conductive substrate 17 can be electrically joined. At this time, the conductive substrate 17
It has a size of mm × 125 mm. Generally, a metal is used, but a light-transmitting conductive material may be used. Further, if a transparent conductive film 12 is used instead of the conductive bonding portion 16, the light-transmitting substrate 11 can be used as the conductive substrate 17.

However, the solar cell 10 and the conductive substrate 17
Is electrically connected, a conductive substrate 17 larger than the solar cell 10 is prepared, and the entire surface of the counter electrode 15 of the solar cell 10 is electrically connected to the conductive substrate 17 as shown in FIG.
And one end of the conductive substrate 17 is protruded in the opposite direction (to the right in the drawing) as a “counter electrode connection terminal”.

Thus, the “light pole side connection terminal”, which is one end of the light-transmitting substrate 11 in a predetermined direction (left direction in the drawing), and one end of the conductive substrate 17 in the opposite direction (right direction in the drawing). The "electrode-side connection terminal" is located diagonally around the photovoltaic cell 10 to produce the solar cell 1.

Next, a case where the solar cells 1 are connected in series in a plane will be described. FIG. 1 is a conceptual diagram showing a cross section of solar cells 1 connected in series using an S-shaped connection fitting 2 as a “conductive metal clip”. FIG. 4 is a cross-sectional view of the solar cells 1 connected in series using the S-shaped connection fitting 2 as connection means. FIG. 5 is a top view of the solar cells 1 connected in series using the S-shaped connection fitting 2 as connection means.

In this case, as shown in FIG. 1, FIG. 4, and FIG.
(One end of the translucent substrate 11 in a predetermined direction (left direction in the drawing)) and the “counter electrode connection terminal” of the other solar cell 1
(One end of conductive substrate 17 in the opposite direction (right direction in the drawing)) is sandwiched by one S-shaped fitting 2 so that one solar cell 1 and the other solar cell 1
And are electrically connected.

As for the S-shaped connection fitting 2, it is needless to say that it needs to be conductive, but it is desirable to have one having spring properties. Therefore, here, one made of spring steel is used. Further, in order to reduce the contact resistance, an S-shaped connection fitting 2 plated with gold or silver having a low electric resistance may be used, or a conductive adhesive may be applied to a contact portion between the solar cell 1 and the S-shaped connection fitting 2. May be inserted. Also, as shown in FIGS. 4 and 5, when the upper and lower ends of the S-shape are processed into a V-shape and an inverted V-shape, as shown in FIGS. 17, the workability is improved. When the conductive substrate 17 is made of metal, the S-shaped connection fitting 2 can be welded or caulked to the conductive substrate 17 in advance.

Although not shown in FIGS. 1, 4, and 5, a high-strength structural insulating adhesive such as epoxy is embedded in the gap between the solar cell 1 and the S-shaped connection fitting 2. This also contributes to improving the reliability of the connection part of the solar cell 1.

The advantage of using a “conductive metal clip” such as the S-shaped connection fitting 2 as the “connection means” is as follows.
Not only the workability described above, but also the reliability of the series connection portion of the solar cell 1 is high.

That is, when solar cells are connected in series in a planar manner using a metal conductive foil formed by soldering as in the prior art, not only solder defects during production and cutting of the metal conductive foil, but also actual use Even in such cases, the inflexible solder may be peeled off at the interface or the metal conductive foil may be cut off due to the repeated wind pressure, so that it often breaks down during use. However, if the “conductive metal clip” such as the S-shaped connection fitting 2 is used as the “connection means” as in the solar cell module of the present embodiment, there is no site that may be cut, and the S-shaped Since there is a restoring force even if the connection fitting 2 or the like is deformed, the electrical connection between one solar cell 1 and the other solar cell 1 can be maintained even under repeated wind pressure.

Further, when the solar cells are connected in series in a plane using a metal conductive foil formed by soldering as in the prior art, the curvature of the metal conductive foil is increased to prevent the metal conductive foil from being cut. Therefore, the connection distance between one solar cell and the other solar cell is inevitably increased, so that a so-called dead area that cannot be used for power generation increases. However, in the solar cell module according to the present embodiment, the width (horizontal direction in the drawing) of the “conductive metal clip” such as the S-shaped connection fitting 2 used as the “connection means” can be reduced. This makes it possible to reduce the so-called dead area that cannot be used for the conventional technology.

In the solar cell module according to the present embodiment, a “conductive adhesive” may be used as the “connection means” instead of the “conductive metal clip” such as the S-shaped connection fitting 2. . FIG. 6 is a conceptual diagram showing a cross section of solar cells 1 connected in series using conductive adhesive 3. In this case, as shown in FIG. 6, the “light pole side connection terminal” (one end of the light-transmitting substrate 11 in a predetermined direction (left direction in the drawing)) of one solar cell 1 and the other solar cell 1
Is filled with the conductive adhesive 3 so as to fill the space with the “counter electrode side connection terminal” (one end of the conductive substrate 17 in the opposite direction (right direction in the drawing)). The solar cell 1 is electrically connected.

Here, an epoxy adhesive containing silver is used as the conductive adhesive 3. Although the bonding strength of the conductive adhesive 3 is higher than the bonding strength of the solder, it is lower than that of a general structural adhesive. Therefore, in FIG. 6, a high-strength insulating adhesive 4 for a structure such as epoxy is embedded in a gap between the solar cell 1 and the conductive adhesive 3, and the repetition added to the solar cell module of the present embodiment is performed. With respect to the wind pressure and stress, the reliability of the connection portion of the solar cell 1 is further increased.

Further, when solar cells are connected in series in a plane using a metal conductive foil formed by soldering as in the prior art, the curvature of the metal conductive foil is increased to prevent the metal conductive foil from being cut. Therefore, the connection distance between one solar cell and the other solar cell is inevitably increased, and as a result, a metal conductive foil having excellent conductivity must be used. However, as shown in FIG. 6, in the solar cell module of the present embodiment, the connection distance between one solar cell 1 and the other solar cell 1 is equal to the thickness of solar cell 10 (about several hundred μm). Since there is only a distance, it is possible to use the conductive adhesive 3 having higher electric resistance than the metal conductive foil. Further, since the amount of the conductive adhesive 3 used is small, the cost is low.

Further, when the solar cells are connected in series in a plane using a metal conductive foil formed by soldering as in the prior art, the curvature of the metal conductive foil is increased to prevent the metal conductive foil from being cut. Therefore, the connection distance between one solar cell and the other solar cell is inevitably increased, so that a so-called dead area that cannot be used for power generation increases. However, as shown in FIG. 6, in the solar cell module of the present embodiment, the width of the space filled with the conductive adhesive 3 used as the “connection means” (in the horizontal direction in the drawing) can be reduced. Therefore, the so-called dead area that cannot be used for power generation can be reduced as compared with the related art.

Further, when solar cells are connected in series in a plane using a metal conductive foil formed by soldering as in the prior art, local irregularities are formed on the surface of the solar cells, so that vacuum heat is applied. When completely adhered and sealed with a fusion press,
Photovoltaic cells are easily destroyed. However, as shown in FIG. 6, in the solar cell module of the present embodiment, since no local irregularities are formed on the surface of solar cell 1, even if they are completely adhered and sealed by a vacuum heat fusion press, In addition, destruction of the solar cell 10 is unlikely to occur.

Next, a case where the solar cells 1 connected in series in a plane are modularized will be described with reference to FIGS. 7 and 8. FIG.

FIG. 7 is a conceptual diagram showing a cross section when the solar cells 1 connected in series in a plane using the S-shaped connection fitting 2 are modularized. As shown in FIG. 7, in order to make a module, first, a predetermined mold is placed on a moisture-proof sheet 23 in which a metal foil is adhered to a fluorine-based resin film. The solar cell 1 is disposed so as to be connected in series in a plane using the mold connection fitting 2. Next, the translucent resin 22 is poured into a predetermined mold.

The translucent resin 22 can be cast and has transparency after molding and curing. Further, the light-transmitting resin 22 is desirably light-resistant, and for example, a liquid resin such as acrylic, urethane, or silicon can be used.

After the light-transmitting resin 22 is poured into a predetermined mold, a white-plated glass thermally strengthened is placed on the light-transmitting resin 22 as the light-transmitting substrate 21. Next, after performing a defoaming process by a vacuum, the translucent resin 22 is cured, so that the solar cells 1 connected in series in a plane using the S-shaped connection fitting 2 are connected to the translucent substrate. 21 and the moisture-proof sheet 23 are firmly joined. Thereafter, the module can be formed as shown in FIG. 7 by being fitted into an aluminum frame (not shown) with the translucent substrate 21 as a reference. In addition, this module generated photovoltaic force by light irradiation, and no connection failure was recognized. Therefore, the module completely functioned as a module.

Although the translucent substrate 21 and the moisture-proof sheet 23 are used here, these are not necessarily required depending on the application. For example, if a hard coat is formed on the surface of the cured translucent resin 22, the translucent substrate 21 becomes unnecessary. Note that the module at this time is a transparent substrate 21.
Since a hard coat is formed in place of, it has flexibility.

On the other hand, FIG. 8 is a conceptual diagram showing a cross section when the solar cells 1 connected in series in a plane using the conductive adhesive 3 are modularized. As shown in FIG. 8, in order to make a module, first, a predetermined mold is placed on a moisture-proof sheet 23 in which a metal foil is adhered to a fluorine-based resin film. Adhesive 3
Is used to arrange the solar cells 1 connected in series in a plane. Next, the translucent resin 22 is poured into a predetermined mold.

The translucent resin 22 can be cast and has transparency after molding and curing. Further, the light-transmitting resin 22 is desirably light-resistant, and for example, a liquid resin such as acrylic, urethane, or silicon can be used.

After the light-transmitting resin 22 is poured into a predetermined mold, a heat-strengthened white plate glass is set on the light-transmitting resin 22 as the light-transmitting substrate 21. Next, after performing a defoaming treatment by vacuum, the light-transmitting resin 22 is cured, so that the solar cells 1 connected in series in a plane using the conductive adhesive 3 are connected to the light-transmitting substrate 21. And the moisture-proof sheet 23. Furthermore, the module can be formed as shown in FIG. 8 by being fitted into an aluminum frame (not shown) based on the translucent substrate 21. In addition, this module generated photovoltaic force by light irradiation, and no connection failure was recognized. Therefore, the module completely functioned as a module.

Also in this case, the light-transmitting substrate 21 and the moisture-proof sheet 23 are used, but these are not necessarily required depending on the use. For example, if a hard coat is formed on the surface of the cured translucent resin 22, the translucent substrate 21 becomes unnecessary.

In the case of FIGS. 7 and 8, an EVA sheet can be used in place of the translucent resin 22.
That is, first, an EVA sheet is laminated on a moisture-proof sheet 23 in which a metal foil is adhered to a fluorine-based resin film, and further, on the EVA sheet, using an S-shaped connection fitting 2 or a conductive adhesive 3. The solar cells 1 connected in series in a plane are arranged. Then, an EVA sheet is laminated on the solar cells 1 connected in series in a planar manner using the S-shaped connection fitting 2 or the conductive adhesive 3, and further, the one obtained by thermally strengthening the white sheet glass is: EV as the translucent substrate 21
Place on the A sheet.

Next, by applying pressure at a predetermined vacuum pressure, a predetermined temperature, and a predetermined time by a vacuum heat fusion press, they were connected in series in a plane using the S-shaped connection fitting 2 or the conductive adhesive 3. The solar cell 1 is firmly joined to the translucent substrate 21 and the moisture-proof sheet 23. Thereafter, the module was formed as shown in FIGS. 7 and 8 by being fitted into an aluminum frame (not shown) with the translucent substrate 21 as a reference. still,
This module completely functioned as a module because photovoltaic power was generated by light irradiation and no connection failure was observed. In addition, there was no destruction of solar cell 10 (see FIG. 6).

As described in detail above, the solar cell module of the present embodiment has the solar cell 1 in which at least two or more are connected in series. In the solar cell 1, on the side of the light pole 14 of the solar cell 10 (upper side in the drawing), the translucent substrate 11 is electrically connected via the transparent conductive film 12, and the solar cell 10 On the side of the counter electrode 15 (lower side in the drawing), the conductive substrate 17
Are electrically connected. Furthermore, in the solar cell 1,
On the side of the light pole 14 of the solar cell 10 (upper side in the drawing), one end of the light-transmitting substrate 11 protrudes in a predetermined direction (leftward in the drawing) as a “light pole side connection terminal”. On the side of the counter electrode 15 of the battery cell 10 (the lower side of the drawing), as the “counter electrode side connection terminal”, the conductive substrate 17 in the opposite direction (the right direction of the drawing) opposite to the predetermined direction (the left direction of the drawing) One end protrudes. Therefore, in the solar cell 1, as shown in FIG. 2, the “light pole side connection terminal” (the light-transmitting substrate in the predetermined direction (left direction in the drawing)) is positioned diagonally around the solar cell 10. 1
1) and the “counter electrode connection terminal” (one end of the conductive substrate 17 in the opposite direction (right direction in the drawing)).

Therefore, when the solar cells 1 are arranged in series to be connected in series, as shown in FIG. 1 and FIG.
The vertical projection surface of the “light pole side connection terminal” of one of the solar cells 1 (one end of the translucent substrate 11 in a predetermined direction (left direction in the drawing)) is used as the “counter electrode side connection terminal” of the other solar cell 1. (One end of the conductive substrate 17 in the opposite direction (the right direction in the drawing)). And the "light pole side connection terminal" of one solar cell 1
(One end of the translucent substrate 11 in a predetermined direction (left direction in the drawing)) and the “counter electrode connection terminal” of the other solar cell 1
(One end of the conductive substrate 17 in the opposite direction (right direction in the drawing)) is electrically connected with the S-shaped connection fitting 2 or the conductive adhesive 3 so that each of the solar cells 1 is connected in series. It can be easily connected.

Here, for convenience of explanation, the solar cell 10
Assuming that the side of the light pole 14 of the solar cell 1 is simply “upward” and the side of the counter electrode 15 of the solar cell 10 is simply “downward”, the “light-side connection terminal” of the solar cell 1 Since it is one end and protrudes from the solar cell 10 in a predetermined direction (left direction in the drawing), the “light pole side connection terminal” of the solar cell 1 exists directly above and directly below the solar cell 10. I will not do it. The “counter electrode connection terminal” of the solar cell 1 is one end of the conductive substrate 17 and protrudes from the solar cell 10 in the opposite direction (to the right in the drawing). The “counter electrode connection terminal” does not exist directly above or directly below the solar cell 10. Therefore, as shown in FIG. 1 and FIG. 6, the solar cell 1 is formed so that the local uneven portion due to the S-shaped connection fitting 2 and the conductive adhesive 3 is not formed directly above and below the solar cell 10. Can be connected in series.

That is, in the solar cell module according to the present embodiment, as shown in FIG. 2, the translucent light projecting in a predetermined direction (left side in the drawing) on the light pole 14 side (upper side in the drawing) of the solar cell 10. One end of the conductive substrate 11 is referred to as a “light pole side connection terminal”, and one end of a conductive substrate 17 protruding in the opposite direction (right side in the drawing) on the side of the counter electrode 15 of the solar cell 10 (lower side in the drawing). By setting the portion as a “counter electrode connection terminal”, the “light electrode side connection terminal” (one end of the light-transmitting substrate 11 in a predetermined direction (left direction in the drawing)) and the “counter electrode side connection terminal” (opposite direction ( The solar cell 1 includes a conductive substrate 17 (right end in the drawing) and one end of the conductive substrate 17 symmetrically provided at diagonal positions with the solar cell 10 as a center.

Therefore, as shown in FIGS. 1 and 6, the solar cell module according to the present embodiment has a “light pole side connection terminal” (a predetermined direction (left direction in the drawing)) of one of the solar cells 1.
Of the light-transmitting substrate 11) (one end of the conductive substrate 17 in the opposite direction (right direction in the drawing) of the other solar cell 1). At least two or more solar cells 1 are arranged, and the “light pole side connection terminal” (one end of the light-transmitting substrate 11 in a predetermined direction (left direction in the drawing)) of one solar cell 1 and the other solar cell 1 Electrically connecting the “counter electrode side connection terminal” (one end of the conductive substrate 17 in the opposite direction (right direction in the drawing)) of the solar cell 1 with the S-shaped connection fitting 2 and the conductive adhesive 3 Accordingly, a simplified new structure is provided for easily connecting each of the solar cells 1 in series.

This new connection structure is a solar cell 10
Each of the solar cells 1 can be connected in series so that a local uneven portion due to the S-shaped connection fitting 2 and the conductive adhesive 3 is not formed directly above and below the solar cell 1. Even when a mechanical load is applied to each of the solar cells 1 when a module in which the respective elements are connected in series is formed into a module, the distribution of the stress generated in the solar cell 10 becomes uniform, whereby the solar cell Destruction of the cell 10 can be prevented. Therefore, it can be said that the solar cell module of the present embodiment has an improved yield during manufacturing.

In the solar cell module of this embodiment, the transparent substrate 11 is electrically connected to the light pole 14 side (upper side in the drawing) of the solar cell 10 via the transparent conductive film 12. Although it is bonded, it may be electrically connected to the light pole 14 side (upper side in the drawing) of the solar cell 10 due to the conductivity of the translucent substrate 11 itself. However, in this case, the transparent conductive film 12 functions as an adhesive.

In the solar cell module according to the present embodiment, solar cell 10 is of a crystalline type. However, as described above, the solar cell 10 may be a non-crystalline (amorphous) compound or a compound-based solar cell as long as the light-transmitting substrate 11 and the conductive substrate 17 that are larger than the solar cell 10 can be provided together. , Thin film polycrystalline,
It may be of a wet type or an organic type.

Further, in the solar cell module of the present embodiment, when the solar cells 1 are arranged in series so as to be connected in series, the “light pole side connection terminal” of one of the solar cells 1
(One end of the translucent substrate 11 in a predetermined direction (left direction in the drawing)) and the “counter electrode connection terminal” of the other solar cell 1
(One end of the conductive substrate 17 in the opposite direction (right direction in the drawing)) is vertically adjacent (in the drawing) with a space therebetween.

Therefore, as shown in FIGS. 1 and 6, the solar cell module according to the present embodiment differs from the prior art in that the “light-side connection terminal” of one of the solar cells 1 is different.
(One end of the translucent substrate 11 in a predetermined direction (left direction in the drawing)) and the “counter electrode connection terminal” of the other solar cell 1
As the "connection means" for electrically connecting (one end of the conductive substrate 17 in the opposite direction (right direction in the drawing)), the S-shaped connection fitting 2 or the conductive adhesive 3 can be used. Since the use of the metal conductive foil can be avoided, the solar cell 10 is free from the destruction of the solar cell 10 due to thermal stress generated at the time of soldering the metal conductive foil, and each of the solar cells 1 is connected in series. It is also free from breakage of the metal conductive foil that occurs when the module is modularized. In addition, it is free from troubles such as breakage of metal conductive foil and peeling of soldered parts, which are caused when repeatedly receiving a load by wind pressure or the like outdoors, so that the probability of failure occurrence is reduced and reliability is improved. be able to.

As shown in FIG. 11, in the conventional technique, one end of a metal conductive foil 102 is attached to the surface of one solar cell 101 and the other end of the metal conductive foil 102 is connected to the other end, as shown in FIG. Adhere to the back surface of the solar cell 101. However, the solar cell module of the present embodiment is also free from such a complicated operation (soldering of the metal conductive foil), so that it is possible to contribute to simplifying the manufacturing process and reducing the manufacturing cost. Furthermore, the distance between each of the solar cells 10 is compared with the distance secured to cover the weak bending of the metal conductive foil,
Since the length can be shortened, a so-called dead area is reduced, and mounting efficiency can be improved.

In particular, the “light-side connection terminal” of one of the solar cells 1 (the light-transmitting substrate 1 in a predetermined direction (left direction in the drawing))
One end of the first solar cell 1) and the “counter electrode connection terminal” of the other solar cell 1 (one end of the conductive substrate 17 in the opposite direction (right direction in the drawing)) are electrically connected as “connection means”. When the adhesive 3 is used, a large number of solar cells 1 can be connected at the same time, so that the production efficiency can be significantly improved. Further, as shown in FIG.
Each of the solar cells 1 can be connected in series so as not to form a local uneven portion directly above and below the solar cell 1, so that a distribution of stress generated in the solar cell 10. Becomes more uniform.

As shown in FIGS. 1 and 6, in the solar cell module of this embodiment, one of the solar cells 1
"Light electrode side connection terminal" (one end of the light-transmitting substrate 11 in a predetermined direction (left direction in the drawing)) and the other solar cell 1 "counter electrode side connection terminal" (opposite direction (right direction in the drawing))
When the S-shaped connection fitting 2 or the conductive adhesive 3 is used as the “connection means” for electrically connecting the one end of the conductive substrate 17, each of the solar cells 1 is connected in series. Since the dimensions of the solar cell 1 are high, not only the solar cell 1 connected in series is sandwiched by a translucent film such as an EVA sheet and heat-sealed, but also as shown in FIG. 7 and FIG. Furthermore, by encapsulating the solar cell 1 in which each of the solar cells 1 are connected in series with the translucent resin 22, it is possible to make the solar cell 1 in which each of the solar cells 1 are connected in series into a module.

It should be noted that the present invention is not limited to the above embodiment, and various changes can be made without departing from the gist of the present invention. For example, as shown in FIG. 9, a solar cell as a unit of a solar cell module is formed by forming a transparent conductive film 53, an amorphous (amorphous) solar cell 54, and a conductive film 55 on a light-transmitting substrate 52. What was formed (solar cell 5
1), each of the solar cells 51 may be electrically connected by an H-shaped connection fitting 61.

The H-shaped connection fitting 61 need not only be conductive, but it is desirable to have one having spring properties. Therefore, the one made of spring steel is used here. Further, in order to reduce the contact resistance, an H-shaped connection fitting 61 plated with gold or silver having a low electric resistance is used.
Or a conductive adhesive may be inserted into the contact portion between the solar cell 51 and the H-shaped connection fitting 61. Also, if the upper and lower ends of the H-shape are processed into a V-shape and an inverted V-shape in the H-shape connection fitting 61, the translucent substrate 52 can be easily inserted, so that the workability is improved.

Also in the case of FIG. 9, since each of the solar cells 51 is connected in series, the dimensional maintainability is high.
In addition to heat-sealing the solar cell 51 in which each of the solar cells 51 are connected in series with a translucent film such as an EVA sheet, the solar cell 51 in which each of the solar cells 51 is connected in series is made of a translucent resin. Also by encapsulating, it is possible to modularize a solar cell 51 in which each of the solar cells 51 is connected in series.

That is, even such a solar cell module has a solar cell 51 in which at least two or more are connected in series. In the solar cell 51, the light electrode side (upper side in FIG. 9) of the solar cell 54 is electrically connected to the light transmitting substrate 52 via the transparent conductive film 53, and the opposite electrode side of the solar cell 54. 9 (lower side in FIG. 9) is electrically connected to the light-transmitting substrate 52 via the conductive film 55.
Furthermore, in the solar cell 51, the “light pole side connection terminal”
One end of the translucent substrate 52 (to the left in FIG. 9) protrudes from the solar cell 54, and the translucent substrate 52 serves as a “counter electrode connection terminal”.
The other end (rightward in FIG. 9) protrudes from the battery cell 54. Therefore, in the solar cell 51,
The “light pole side connection terminal” (one end of the left side light-transmitting substrate 52 in FIG. 9) and the “counter electrode side connection terminal” (right side light transmission in FIG. (The other end of the conductive substrate 52).

Therefore, when arranging the solar cells 51 in series so as to connect them in series, as shown in FIG. 9, the “light pole side connection terminal” of one of the solar cells 51 (leftward direction in FIG. 9) One end of the light-transmitting substrate 52) and the other solar cell 51
(The other end of the translucent substrate 52 in the right direction in FIG. 9) can be arranged facing each other. Then, the “light pole side connection terminal” of one solar cell 51 (one end of the translucent substrate 52 in the left direction in FIG. 9) and the “counter electrode side connection terminal” of the other solar cell 51 (right side in FIG. 9) The other end of the translucent substrate 52)
By electrically connecting with the H-shaped connection fitting 61, each of the solar cells can be easily connected in series.

Here, for convenience of explanation, the solar cell 54
When the light pole side of the solar cell 51 is simply referred to as “upward” and the counter electrode side of the solar cell 54 is simply referred to as “downward”, the “light pole side connection terminal” of the solar cell 51 is one end of the translucent substrate 52. Therefore, the “light-electrode-side connection terminal” of the solar cell 51 does not exist directly above or directly below the solar cell 54 because it protrudes from the solar cell 54 to the left in FIG. The “counter electrode connection terminal” of the solar cell 51 is the other end of the light-transmitting substrate 52 and is connected to the solar cell 54 from FIG.
Of the solar cell 51, the “counter electrode connection terminal” is located directly above the solar cell 54.
It does not exist directly below. Therefore, as shown in FIG. 9, it is possible to connect each of the solar cells 51 in series so that a local uneven portion due to the H-shaped connection fitting 61 is not formed directly above or directly below the solar cell 54. it can.

That is, in such a solar cell module, one end of the translucent substrate 52 projecting from the solar cell 54 to the left in FIG. The other end of the translucent substrate 52 projecting rightward from FIG. 9 as a “counter-electrode-side connection terminal” allows the “light-electrode-side connection terminal” (the left-side translucent substrate 52 in FIG. There is a solar cell 51 in which one end) and a “counter electrode side connection terminal” (the other end of the translucent substrate 52 in the right direction in FIG. 9) are provided symmetrically at a position facing the translucent substrate 52. Then, as shown in FIG. 9, the “light pole side connection terminal” of one solar cell 51 (one end of the translucent substrate 52 in the left direction of FIG. 9) and the “counter electrode side connection terminal” of the other solar cell 51. (The other end of the translucent substrate 52 in the right direction in FIG. 9). At the same time, at least two or more solar cells 51 are arranged, and the “light pole side connection terminal” of one of the solar cells 51 (one end of the translucent substrate 52 in the left direction in FIG. 9) and the other solar cell 51 “Counter electrode connection terminal” of the battery 51 (the other end of the translucent substrate 52 in the right direction in FIG. 9)
Are electrically connected to each other by an H-shaped connection fitting 61, so that each of the solar cells 51 can be easily connected in series with a simplified new structure.

This new connection structure, as shown in FIG. 9, is provided so that the H-shaped connection fitting 61 does not form a local uneven portion directly above and below the solar battery cell 54. Since each of the solar cells 51 can be connected in series, when a module in which each of the solar cells 51 is connected in series is modularized, even if a mechanical load is applied to each of the solar cells 51, the solar cells 51 , The distribution of the stress generated in the solar cell 54 becomes uniform, thereby making it possible to prevent the solar cell 54 from being broken. Therefore, it can be said that such a solar cell module has an improved yield in manufacturing.

In such a solar cell module, the “light pole side connection terminal” of one of the solar cells 51
(One end of the left translucent substrate 52 in FIG. 9) and the “counter electrode connection terminal” of the other solar cell 51 (the other end of the right translucent substrate 52 in FIG. 9) are electrically connected. The H-shaped connection metal fitting 61 was used as a "connection means" for connecting to the.
However, it is also possible to use the above-described conductive adhesive 3 (see FIGS. 6 and 8) instead of the H-shaped connection fitting 61. Therefore, effects similar to those of the solar cell module shown in FIGS. 1 to 8 can be obtained.

Further, in such a solar cell module, as shown in FIG. 9, two or more solar cells 54 on one translucent substrate 52 via a transparent conductive film 53 or a conductive film 55. Are electrically connected to each other as a solar cell 51. However, the one in which one solar cell 54 is formed in one translucent substrate 52 may be used as the solar cell 51.

Further, in such a solar cell module, the solar cell 54 is made of a non-crystalline (amorphous) type.
It was. However, as described above, as long as a translucent substrate 52 larger than the solar cell 54 can be provided, the solar cell 54 may be a crystalline type, a compound type, a thin film polycrystalline type, or a wet type. System, organic system, and the like.

[0086]

According to the solar cell module of the present invention, one end of the translucent substrate protruding in a predetermined direction on the light pole side of the solar cell is used as the light pole side connection terminal, and on the opposite electrode side of the solar cell. By using one end of the conductive substrate projecting in the opposite direction as the counter electrode connection terminal, the light electrode side connection terminal and the counter electrode side connection terminal are provided symmetrically at diagonal positions around the solar cell. Having a solar cell, arranging at least two or more solar cells while overlapping the vertical projection surface of the light-electrode-side connection terminal of one solar cell with the counter-electrode-side connection terminal of the other solar cell; By electrically connecting the light-electrode-side connection terminal of the solar cell and the counter-electrode-side connection terminal of the other solar cell by connection means, each of the solar cells is easily connected in series, This new connection structure has a simplified structure, and this new connection structure connects each of the solar cells in series so that no local unevenness is formed by the connection means directly above and below the solar cell. Since the solar cells can be connected, even when a mechanical load is applied to each of the solar cells when the solar cells are connected in series to form a module, the distribution of the stress generated in the solar cells is one. As a result, it is possible to prevent the destruction of the solar cell. Therefore, it can be said that the solar cell module of the present invention has an improved yield during manufacturing.

Further, in the solar cell module of the present invention,
One end of the light-transmitting substrate protruding from the solar cell is used as a light-electrode-side connection terminal, and the other end of the light-transmitting substrate protruding from the solar cell is used as a counter-electrode-side connection terminal. Having a solar cell symmetrically provided with a connection terminal and a counter electrode side connection terminal at a position facing the translucent substrate, a light pole side connection terminal of one solar cell and a counter electrode side connection terminal of the other solar cell, While facing each other, arrange at least two or more solar cells,
By electrically connecting the light-electrode-side connection terminal of one solar cell and the counter-electrode-side connection terminal of the other solar cell by connecting means, a simplified new connection that easily connects each of the solar cells in series. This new connection structure allows each of the solar cells to be connected in series so that a local uneven portion is not formed directly above and below the solar cell by the connection means. Therefore, when modularizing a solar cell in which each of the solar cells is connected in series, even if a mechanical load is applied to each of the solar cells, the distribution of the stress generated in the solar cells becomes uniform, thereby In addition, it is possible to prevent the destruction of the solar cell. Therefore, it can be said that the solar cell module of the present invention has an improved yield during manufacturing.

Further, in the solar cell module of the present invention,
Unlike the prior art, as a connection means for electrically connecting the light-electrode-side connection terminal of one solar cell and the counter-electrode-side connection terminal of the other solar cell, a conductive metal clip or a conductive adhesive is used. Since it becomes possible to use and avoid using a metal conductive foil, it is free from the destruction of the solar cell due to thermal stress generated when soldering the metal conductive foil, and connecting each of the solar cells in series. This also frees the metal conductive foil from breaking when it is made into a module. In addition, it is free from troubles such as breakage of metal conductive foil and peeling of soldered parts, which are caused when repeatedly receiving a load by wind pressure or the like outdoors, so that the probability of failure occurrence is reduced and reliability is improved. be able to.

In the conventional technique, soldering of a metal conductive foil involves attaching one end of the metal conductive foil to the surface of one solar cell and attaching the other end of the metal conductive foil to the back surface of the other solar cell. However, the solar cell module of the present invention is also free from such a complicated operation (soldering of the metal conductive foil), which can contribute to simplification of the manufacturing process and reduction of the manufacturing cost. Furthermore, since the interval between each of the solar cells can be made shorter than the distance secured to cover the weakness of bending of the metal conductive foil, the so-called dead area is reduced and the mounting efficiency is improved. be able to.

In particular, when a conductive adhesive is used as a connecting means for electrically connecting the light-electrode-side connection terminal of one solar cell and the counter-electrode-side connection terminal of the other solar cell, a large number of solar cells are required. Since batteries can be connected at the same time, production efficiency can be significantly improved.
Furthermore, immediately above and below the solar cell, each of the solar cells can be connected in series so that a local uneven portion is not formed by the connection means, so that the distribution of stress generated in the solar cell is more. Become uniform.

Further, in the solar cell module of the present invention, a conductive metal clip or conductive metal is used as a connecting means for electrically connecting the light-electrode-side connection terminal of one solar cell and the counter-electrode connection terminal of the other solar cell. In the case of using a conductive adhesive, the solar cells connected in series have high dimensional maintainability, so the solar cells connected in series are sandwiched by a translucent film and heat-sealed. In addition, by encapsulating the solar cells connected in series with a translucent resin, the solar cells connected in series can be modularized.

[Brief description of the drawings]

FIG. 1 is a conceptual diagram showing a cross section when solar cells, which are units of a solar cell module of the present invention, are connected in series by S-shaped fittings.

FIG. 2 is a cross-sectional view of a solar cell as a unit of the solar cell module of the present invention, which is cut along a line AA in FIG.

FIG. 3 is a top view of a solar cell as a unit of the solar cell module of the present invention.

4 is a cross-sectional view of a case where solar cells, which are units of the solar cell module of the present invention, are connected in series with an S-shaped fitting, and is cut along line BB in FIG.

FIG. 5 is a top view in the case where solar cells as units of the solar cell module of the present invention are connected in series by S-shaped fittings.

FIG. 6 is a conceptual diagram showing a cross section when solar cells as units of the solar cell module of the present invention are connected in series with a conductive adhesive.

FIG. 7 is a conceptual diagram showing a cross section when the solar cell of FIG. 1 is modularized.

FIG. 8 is a conceptual diagram showing a cross section when the solar cell of FIG. 6 is modularized.

FIG. 9 is a conceptual diagram showing a cross section when solar cells, which are units of the solar cell module of the present invention, are connected in series by an H-shaped fitting.

FIG. 10 is a front view showing solar cells connected in series by a metal conductive foil in a conventional solar cell module.

11 is a cross-sectional view of a conventional solar cell module taken along line CC in FIG.

FIG. 12 is a cross-sectional view showing a conventional solar cell module.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 51 Solar cell 2 S-shaped connection fitting 3 Conductive adhesive 10, 54 Solar cell 11, 52 Translucent substrate 12, 53 Transparent conductive film 14 Light pole 15 Counter electrode 17 Conductive substrate 22 Translucent resin 55 Conductive film 61 H-shaped fitting

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tatsuo Toyoda 2-1-1 Asahi-cho, Kariya-shi, Aichi F-term (reference) in Aisin Seiki Co., Ltd. 5F051 AA03 AA04 AA05 AA07 AA11 EA02 GA03 JA02 JA05 JA06 JA08 JA20

Claims (6)

[Claims] 1. A solar cell module having at least two or more solar cells connected in series, wherein each of the solar cells has a light pole and a counter electrode, and the solar cell A light-transmitting substrate electrically connected to the light-electrode side of the light-transmitting substrate via a transparent conductive film; A terminal, a conductive substrate electrically connected to a counter electrode side of the solar cell, and a counter electrode side connection terminal that is one end of the conductive substrate and protrudes in a direction opposite to the solar cell. Each of the solar cells is arranged while overlapping the vertical projection surface of the light pole side connection terminal of one of the solar cells with the counter electrode side connection terminal of the other solar cell, and the light pole of one of the solar cells Side connection Solar cell module that are electrically connected, and said connection means and the counter electrode-side connection terminal Minaru the other solar cell. 2. A solar cell module having a portion in which at least two or more solar cells are connected in series, wherein each of the solar cells has a solar cell having a light pole and a counter electrode; A light-transmitting substrate electrically connected to the light-electrode side of the cell via a transparent conductive film and electrically connected to the opposite electrode side of the solar cell via a conductive film; and A light-electrode-side connection terminal protruding from the solar cell at one end; and a counter-electrode-side connection terminal protruding from the solar cell at the other end of the translucent substrate. And arranging each of the solar cells while facing the light-electrode-side connection terminal of one of the solar cells and the counter-electrode-side connection terminal of the other solar cell, and connecting the light-electrode-side connection terminal of one of the solar cells to the other. Thick A solar cell module, wherein the solar cell module is electrically connected to a counter electrode side connection terminal of the positive cell by connection means. 3. The solar cell module according to claim 1, wherein the connection means sandwiches a light-electrode-side connection terminal of one solar cell and a counter-electrode-side connection terminal of the other solar cell. A solar cell module, which is a conductive metal clip. 4. The solar cell module according to claim 1, wherein the connection means fills a space between a light-electrode-side connection terminal of one of the solar cells and a counter-electrode-side connection terminal of the other solar cell. A solar cell module, wherein the conductive adhesive is a conductive adhesive. 5. The solar cell module according to claim 3, wherein each of the solar cells connected in series by the connection means is sealed with a translucent resin. . 6. The solar cell module according to claim 3, wherein each of the solar cells connected in series by said connection means is sandwiched by a light-transmitting film and heat-sealed. Solar cell module.