JP2020149986A - Solar cell module and photovoltaic power generation system - Google Patents

Abstract

To improve the power generation capacity or power generation efficiency of a photovoltaic power generation system.SOLUTION: A solar cell module 100 according to an embodiment of the present invention includes a wiring 30 formed substantially linearly in a plan view via a bypass diode 20, a connection unit 40 in which a plurality of solar cells 10 are electrically connected in series and connected to the wiring 30, a combination unit 50 consisting of a bypass diode 20 electrically connected with the connection unit 40 in parallel using the wiring 30, and a plate-shaped base material 60 having the wiring 30 and the combination unit 50.SELECTED DRAWING: Figure 1

Description

The present invention relates to a solar cell module and a photovoltaic power generation system.

A photovoltaic system has a plurality of solar cells installed in a place where light can be received, such as on the ground, on the roof of a building, or on the roof of a house. Further, typically, a solar cell module is configured by electrically connecting a plurality of solar cell strings as one connection unit in which a plurality of solar cell cells are connected in series.

Conventionally, in a solar cell module, by electrically connecting a bypass diode to each solar cell string (connection unit) in parallel, some solar cell string (or some solar cell) is connected to something. Even if an abnormality occurs, it is possible to pass a current without passing through the solar cell string (or some solar cells). As a result, it is possible to suppress a decrease in the power generation capacity or power generation efficiency of the solar cell module.

Conventionally, the bypass diode is provided inside the terminal box for extracting the output from the solar cell module. This terminal box makes it possible to electrically connect to other adjacent solar cell modules, but it is often represented by the deterioration of the function of the diode due to the heat generated by the bypass diode and the deterioration of the performance of the solar cell. The problem is the problem. In the past, a terminal box for a solar cell module has been disclosed that can efficiently dissipate heat from the diode by devising the arrangement of a heat radiating plate for radiating the heat generated by the bypass diode (patented). Document 1).

Japanese Unexamined Patent Publication No. 2005-150277

For example, in a solar cell module having a plurality of solar cell strings (connection units), by incorporating a plurality of bypass diodes together inside the terminal box, there is an effect of facilitating the connection between the bypass diode and the solar cell string. is there. However, as long as the bypass diode is arranged inside the terminal box, it is extremely difficult to completely remove the influence of heat from the diode, which is a heat generating source. As the power generation efficiency increases, the amount of heat generated from the diode also increases, so the effect on the photovoltaic power generation system cannot be ignored.

Further, if the bypass diode is arranged inside the terminal box, the length of the wiring from the solar cell string (connection unit) to the bypass diode becomes long, so that waste during power generation, that is, power generation capacity or This will cause a decrease in power generation efficiency. In particular, in a solar cell module provided with a large number of solar cell strings and only one terminal box, the problem of a decrease in power generation capacity or power generation efficiency caused by the length of the wiring can become more serious.

The present invention solves at least one of the above-mentioned problems, and can greatly contribute to the development of technology for improving the power generation capacity or power generation efficiency of a photovoltaic power generation system.

The present inventor is keen on realizing a solar cell module that can reduce the influence of wiring from the solar cell string (connection unit) to the bypass diode and obtain highly efficient output, and eventually a photovoltaic power generation system. Worked on research.

With the bypass diode still placed inside the terminal box, there is a limit to how much the wiring can be significantly shortened no matter where the terminal box is placed on the base material of the solar cell module. Therefore, the present inventor has found that at least one of the above-mentioned problems can be solved by separating the bypass diode from the terminal box and incorporating the wiring and the bypass diode into the main body of the solar cell module. As a result, the present invention that can realize a solar cell module capable of obtaining highly efficient output, and by extension, a photovoltaic power generation system has been created.

In one solar cell module of the present invention, a wiring formed substantially linearly in a plan view via a bypass diode and a connection unit in which a plurality of solar cells are electrically connected in series and connected to the above-mentioned wiring. A plate-shaped group comprising the above-mentioned wiring and the above-mentioned bypass diode electrically connected in parallel with the connection unit using the wiring or via the wiring, and the above-mentioned wiring and the combination unit. It is equipped with materials.

In this solar cell module, a connection unit (solar cell string) in which a plurality of solar cell cells are electrically connected in series is connected to a wiring formed substantially linearly in a plan view via a bypass diode. A bypass diode is electrically connected in parallel with the connection unit. In addition, the plate-shaped base material of the solar cell module includes a combination unit including the connection unit and the bypass diode, and the above-mentioned wiring. Therefore, since the bypass diode is incorporated into the wiring formed in a substantially linear shape, the wiring from the solar cell string (connection unit) to the bypass diode can be made very short. For example, even if some abnormality occurs in some solar cell strings (or some solar cell cells) and a current flows through the bypass diode, by using the wiring of this solar cell module, Since the length from the connection unit to the bypass diode is very short, it is possible to suppress a decrease in power generation capacity or power generation efficiency as a solar cell module as compared with the conventional case. As a result, it is possible to realize a solar cell module capable of obtaining highly efficient output, and thus a photovoltaic power generation system. Further, according to this solar cell module, the number of solar cell cells included in one solar cell module can be increased as compared with the conventional one, or the solar cell module itself can be miniaturized or space-saving. obtain.

Further, in another solar cell module of the present invention, a plate-shaped base material, wiring formed through a bypass diode so as to follow the outer shape of the base material in a plan view, and a plurality of solar cell cells are electrically used. The above-mentioned group includes a connection unit for connecting in series and connecting to the above-mentioned wiring, and a combination unit including the above-mentioned bypass diode electrically connected in parallel with the connection unit using the wiring. The material comprises the aforementioned wiring and the aforementioned combination unit.

In this solar cell module, a connection unit (solar cell string) in which a plurality of solar cell cells are electrically connected in series is formed so as to follow the outer shape of the base material in a plan view via a bypass diode. It is connected to the wiring and the bypass diode is electrically connected in parallel with the connection unit. In addition, the plate-shaped base material of the solar cell module includes a combination unit including the connection unit and the bypass diode, and the above-mentioned wiring. Therefore, the bypass diode is taken into the wiring formed along the outer shape of the base material, so that the wiring from the solar cell string (connection unit) to the bypass diode should be very short. Is possible. For example, even if some abnormality occurs in some solar cell strings (or some solar cell cells) and a current flows through the bypass diode, by using the wiring of this solar cell module, Since the length from the connection unit to the bypass diode is very short, it is possible to suppress a decrease in power generation capacity or power generation efficiency as a solar cell module as compared with the conventional case. As a result, it is possible to realize a solar cell module capable of obtaining highly efficient output, and thus a photovoltaic power generation system. Further, according to this solar cell module, the number of solar cell cells included in one solar cell module can be increased as compared with the conventional one, or the solar cell module itself can be miniaturized or space-saving. obtain.

As a modification of each of the above-mentioned inventions, the above-mentioned solar cell module includes a plurality of the connection units, and the wiring is also a wiring for electrically connecting the plurality of the connection units in series. Is a preferred embodiment. In the modification, the wiring formed substantially linearly via a bypass diode, or the wiring formed along the outer shape of the base material, electrically connects a plurality of the connection units in series. In addition to connecting, it is possible to play a role of connecting a plurality of the connection units in parallel by using the bypass diode.

According to the present invention, it is possible to realize a solar cell module capable of obtaining a highly efficient output, and thus a photovoltaic power generation system. Further, according to this solar cell module, the number of solar cell cells included in one solar cell module can be increased as compared with the conventional one, or the solar cell module itself can be miniaturized or space-saving. obtain.

It is a top view of the solar cell module of 1st Embodiment. It is a figure which shows schematic the structure of the photovoltaic power generation system of 1st Embodiment. It is a partially enlarged view of FIG. It is a figure which shows the typical current path of the solar cell module of 1st Embodiment. It is an enlarged view of a part (Z region) of FIG. It is a top view of the back surface side of the solar cell module which shows the connection state of the two solar cell modules of 1st Embodiment. It is a perspective view of the back surface side of the solar cell module of the 2nd Embodiment. It is an enlarged perspective view of a part of the back surface side of the solar cell module of the 2nd Embodiment. It is an enlarged perspective view of a part of the back surface side of the solar cell module of the modification of the 2nd Embodiment. It is a top view of the solar cell module of another embodiment (1). It is a top view of the solar cell module of another embodiment (2). It is a top view of the solar cell module of another embodiment (3). It is a top view of the conventional (comparative example) solar cell module. It is a partially enlarged view of FIG. It is a figure for convenience of the explanation of FIG. 14A.

Embodiments of the present invention will be described in detail with reference to the accompanying drawings. In this description, common reference numerals are given to common parts throughout the drawings unless otherwise specified. Further, in the figure, each of the elements of each embodiment is not necessarily shown while maintaining a scale ratio of each other. In addition, some reference numerals may be omitted in order to make each drawing easier to see.

<First Embodiment>
FIG. 1 is a plan view of the solar cell module 100 of the present embodiment. Further, FIG. 2 is a diagram schematically showing the configuration of the photovoltaic power generation system 800 of the present embodiment. Further, FIG. 3 is a partially enlarged view of FIG. In addition, FIG. 4 is a diagram showing a schematic current path of the solar cell module 100 of the present embodiment. Further, FIG. 13 is a plan view of the conventional solar cell module 900 as a comparative example. 14A is a partially enlarged view of FIG. 13, and FIG. 14B is a diagram for convenience of explanation of FIG. 14A.

As shown in FIG. 1, in the solar cell module 100, a plurality of solar cell cells 10 are supported by a plate-shaped base material 60 fixed by a frame body 60a in a state of being electrically connected to each other. .. In this embodiment, a so-called super straight structure is adopted in which the solar cell 10 is incident with light through the translucent base material 60. Therefore, the plurality of electrically connected solar cells 10 and the wiring 30 and the series connection wiring 42 formed substantially linearly in a plan view via the bypass diode 20 described later are all base materials. It is arranged between 60 and a back surface protective material (for example, a structure in which aluminum is sandwiched between vinyl fluoride films, a polyethylene sheet). Further, in order to alleviate mechanical impact and the like, a known filling material having insulation and translucency (for example, EVA (ethylene-vinyl acetate copolymer)) is sealed between the base material 60 and the back surface protective material. Can be done. Further, it is also possible to adopt that a known antireflection film is formed so as to cover at least a part of the solar cell 10 on the light receiving surface side.

As shown in FIG. 2, the photovoltaic power generation system 800 of the present embodiment has a plurality of solar cell modules installed in a place where light can be received, such as on the ground, on the roof of a building, or on the roof of a house. The junction box 80, which is electrically connected to the 100 and the plurality of solar cell modules 100 and incorporates the switch 82 for the plurality of solar cell modules 100, and the DC power generated by the plurality of solar cell modules 100 are exchanged. It includes a power conditioner 84 that converts power into electricity.

Further, the solar cell module 100 of the present embodiment is shown in 3 (a) to (c) below for electrically connecting 10 groups of solar cells forming the 6 rows shown in FIG. 1 in series. It has a kind of wiring.
(A) Known conductive interconnectors 12 (12a, 12b, 12c) for electrically connecting a plurality of solar cell 10s in series for each row.
(B) Three series connection wirings 42 for electrically connecting two adjacent rows in series and forming a solar cell string as a connection unit 40 in combination with (a).
(C) Wiring 30 capable of electrically connecting adjacent connection units 40 in series by electrically connecting to the connection unit 40 by an interconnector 12 (12a, 12b, 12c).

Further, as shown in FIG. 3, in the present embodiment, the wiring 30 in which the connection unit 40 is formed substantially linearly in a plan view via the bypass diode 20 by the interconnector 12 (12a, 12b, 12c). Is connected to. Therefore, one connection unit 40 is electrically connected in parallel with the bypass diode 20 using or via the wiring 30. From a different point of view, the wiring 30 of the present embodiment is formed so as to follow the outer shape of the substantially rectangular base material 60.

Here, as shown in FIG. 1, the wiring 30 of the present embodiment is formed in a region (wiring region) on the surface side of the solar cell module 100 where the solar cell 10 is not arranged.

Specifically, the solar cell module 100 of the present embodiment is provided with the wiring 30 formed substantially linearly in a plan view via the bypass diode 20, so that the wiring 30 is arranged with the solar cell 10. It is possible to arrange using a narrow area that cannot be used. From a different point of view, since the outer shape of the base material 60 is rectangular in the present embodiment, the wiring 30 is formed along the outer shape of the base material 60 (in the present embodiment, the short side of the rectangle). It can be said that. The wiring 30 of the present embodiment has a flat surface in order to increase the contact area of the bypass diode 20 with the lead terminal 22, which will be described later, but the shape of the wiring 30 is not particularly limited.

In this embodiment and each of the embodiments described later (including modified examples), the solar cell module 100 is located on the ground, on the roof of a building, on the roof of a house, or in a place where light can be received. The surface of the solar cell 10 that directly faces the light irradiation source when installed is defined as the light receiving surface of the solar cell 10. Therefore, when the light that has once passed through the base material 60 and the transparent filling material is reflected by the back surface protective material or the like and is incident on the surface of the solar cell 10 opposite to the light receiving surface (back surface side) to generate electricity. Even if there is, as a term in the present embodiment, the surface on the opposite side (back surface side) is not called the light receiving surface of the solar cell 10.

FIG. 6 is a plan view of the back surface side of the solar cell module 100 for showing a situation in which the two solar cell modules 100 of the present embodiment are connected. As shown in FIGS. 1 and 6, the electric power generated by the solar cell module 100 can be taken out to the back surface side as close as possible to both ends 30e and 30e of the wiring 30 on the front surface side of the solar cell module 100. The two terminal boxes 70, 70 are provided in the vicinity of the outer edge corner portion on the back surface side of the solar cell module 100.

As shown in FIG. 6, by devising the arrangement of the terminal boxes 70 and 70 of the present embodiment, the connection portion 74 can be formed by using the output wiring 72 including the connector 72a, that is, two adjacent solar cells. It makes the electrical connection of modules 100, 100 extremely easy. Therefore, the output wiring (terminal cable) is compared with the example in which the conventional terminal box 970 is provided in the substantially central portion of the solar cell module 900, such as the conventional solar cell module 900 shown in FIGS. 13 and 14A. ) Can be significantly shortened.

Further, in the present embodiment, the solar cell module 100 includes a combination unit 50 having the following two configurations (p) and (q).
(P) Connection unit 40
(Q) Bypass diode 20 electrically connected in parallel with the connection unit 40 using the wiring 30

As a result, the solar cell module 100 includes three connection units 40 and three combination units 50. In FIG. 1, one connection unit 40 and one combination unit 50 are typically shown in order to make the drawings easier to see.

By the way, as shown in FIG. 1, the solar cell module 100 of the present embodiment includes a substantially rectangular base material 60. The size of the base material 60 is not particularly limited because it is appropriately selected depending on the size of the manufacturing apparatus of the solar cell module 100, the market requirements, and the like. The length of the typical long side of the base material 60 (the length in the vertical direction on the paper surface of FIG. 1) is about 1300 mm or more and 1500 mm or less, and the length of the typical short side of the base material 60 (FIG. 1). Ls) is about 1000 mm or more and 1200 mm or less.

Further, the length (Lw in FIG. 1), the width, and the thickness of the wiring of the wiring 30 of the present embodiment are not particularly limited as long as the effects of the present embodiment are exhibited. The typical length of the wiring 30 (Lw in FIG. 1) is about 900 mm or more, and is equal to or less than the length of the short side of the base material 60 (Ls in FIG. 1). When the outer shape of the base material 60 is a perfect rectangle as in the present embodiment, the length of the wiring 30 is the same as the length of the short side of the base material 60 (Ls in FIG. 1). Since it is shortened, the arrangement of the wiring from the solar cell string (connection unit) to the bypass diode 20 can be simplified.

Further, the typical width length of the wiring 30 (length in the vertical direction on the paper surface of FIG. 1) is about 6 mm or more and 10 mm or less, and an example of the thickness of the wiring 30 (direction orthogonal to the paper surface of FIG. 1). Is about 0.2 mm or more and 0.3 mm or less. Here, if the width (width length) of the wiring 30 is formed to be 20 times or more longer than the thickness of the wiring 30, the thickness of the wiring is reduced without increasing the electrical resistance of the wiring 30. Therefore, it can contribute to the reduction of the thickness of the solar cell module 100 as a whole. The cross-sectional area of the typical wiring 30 is preferably 0.75 mm ² or more from the viewpoint of having a cross-sectional area that can withstand the current value flowing by the power generation by the solar cell module 100.

Next, the bypass diode 20 of this embodiment will be described. FIG. 5 is an enlarged view of a part (Z region) of FIG. As shown in FIGS. 5 (a) and 5 (b), the bypass diode 20 of the present embodiment includes a flat plate-shaped lead terminal 22. Further, in the present embodiment, as shown in FIG. 5B, one flat plate-shaped lead terminal 22 is refracted four times, and the end portion 22a abuts on the bypass diode 20 to form two flat plate-shaped leads. The lead terminals 22 and 22 of the above sandwich the bypass diode 20. The lead terminal 22 of this embodiment is made of copper. Further, the joint portion between the bypass diode 20 and the lead terminal 22 is tin-plated, and the bypass diode 20 and the lead terminal 22 can be joined by soldering. Therefore, when the bypass diode 20 and the lead terminal 22 are joined. Workability is improved. The flat plate-shaped lead terminals 22 and 22 and the wirings 30 and 30 are joined by surface contact by soldering, and the heat generated from the bypass diode 20 passes through the lead terminals 22 and 22 and is connected to the wirings 30 and 30. Since it becomes easier to conduct heat, heat dissipation is improved.

Further, the bypass diode 20 of the present embodiment is not limited in the type of diode as long as the effect of the present embodiment is exhibited. A typical bypass diode 20 is a Schottky barrier diode. In addition, the resin 25 that covers the bypass diode 20 and the end portion 22a of the flat plate-shaped lead terminal 22 that sandwiches the bypass diode 20 fixes and seals the bypass diode 20 and the end portion 22a. Further, the type of the base material constituting the bypass diode 20 is not particularly limited. For example, at least one selected from the group of silicon (Si), silicon carbide (SiC), gallium oxide (Ga ₂ O ₃ ), gallium nitride (GaN), and silicon germanium (SiGe) is an example of the substrate. Can be adopted.

Here, by adopting the bypass diode 20 provided with the flat plate-shaped lead terminal 22, as described above, the contact area between the lead terminal 22 and the wiring 30 having a flat surface can be increased, so that the bypass diode 20 can be increased. This will increase the heat dissipation of the heat generated by the tablet. As a result, the reliability and stability of the bypass diode 20 can be improved.

Further, the bypass diode 20 of the present embodiment preferably has a width of 0.9 times or more and 1.1 times or less the width of the wiring 30. If the width of the bypass diode 20 is within the above range, the wiring 30 formed substantially linearly in a plan view via the bypass diode 20 can be arranged in a relatively narrow wiring region. Therefore, the number of solar cell 10s arranged in one solar cell module can be increased as compared with the conventional case, or the solar cell module itself can be miniaturized or space-saving.

In the photovoltaic power generation system 800 in which a plurality of solar cell modules 100 are installed close to each other, the end portion of one solar cell module 100 is installed at a position that covers a part of another solar cell module 100, so to speak. May occur. In such a case, the wiring region becomes a region where light cannot be received or the amount of light received is reduced. Therefore, it is worth noting that the solar cell module 100 of the present embodiment effectively utilizes such a region where the contribution of the solar cell module 100 to power generation is small. As another advantage of arranging the wiring 30 on the front surface side of the solar cell module 100, each solar cell 10 is compared with the solar cell module of the second embodiment described later in which the wiring 30 is arranged on the back surface side. The current formed by the power generation of the above can be easily collected in the wiring 30 due to its structure.

By adopting each of the above configurations, in the solar cell module 100 of the present embodiment, as shown in “S” of FIG. 3 and FIG. 4, the wiring 30 (30a, 30b) does not go through the bypass diode 20. ), Or via, allows two adjacent connection units 40 to be electrically connected in series. Therefore, in the solar cell module having a plurality of connection units 40 like the solar cell module 100 of the present embodiment, the wiring 30 serves as wiring for electrically connecting the plurality of connection units 40 in series. Will play the role of.

On the other hand, as shown in FIG. 4, if some abnormality or malfunction occurs in the solar cell string as a part of the connection unit 40 and a situation occurs in which the power generation capacity or the power generation efficiency may decrease, the wiring 30 The power generation circuit can be bypassed by using the bypass diode 20 incorporated in the circuit. Therefore, in the wiring 30 formed substantially linearly via the bypass diode 20, a plurality of connection units 40 are electrically connected in series, and a plurality of connection units 40 are connected in parallel using the bypass diode 20. It is also possible to take on the role of

Although it is a "detour", as shown in FIGS. 1, 3 and 4, by using the wiring 30 formed substantially linearly in a plan view via the bypass diode 20, the connection unit 40 can be used. Since the length up to the bypass diode 20 is very short, it is possible to suppress a decrease in the power generation capacity or power generation efficiency of the solar cell module 100.

Specifically, for example, in the conventional solar cell module 900 including the solar cell 910 shown in FIGS. 13 and 14B, each wiring 930 is connected to each other in order to connect to the bypass diode 920 in the terminal box 970. Two rows of wiring 930 are formed so as not to come into contact with each other. Further, the wiring 930 on the back surface side of the base material 960 with diagonal lines shown in FIGS. 13 and 14A is formed so as to penetrate the wiring 930 on the front surface side and continue through the base material 960.

As a result, as is clear from comparing FIG. 3 and FIG. 14B, the length of the wiring 930 of the conventional solar cell module 900 is larger than the length of the wiring 30 of the solar cell module 100 of the present embodiment in FIG. 14B. The length is increased by the sum of the lengths of the wirings 930 in the four regions A to D shown in.

As an example, for example, the length of a typical short side (Ls in FIG. 1) of the base material 60 of the solar cell module 100 in FIG. 1 is about 970 mm, and the length of the wiring 30 of the solar cell module 100 (Ls). When Lw) in FIG. 1 is about 880 mm, the length of the wiring 30 of the solar cell module 100 of the present embodiment is longer than the length of the wiring 930 of the conventional solar cell module 900 of FIG. Even if the length of 20 is included in the length of the wiring 30, it is shortened by about 1.1 m. Therefore, if the materials and configurations of the wiring 30 and the wiring 930 are the same, the effect of improving the power generation capacity or the power generation efficiency of the solar cell module 100 corresponding to the length of the wiring shortened by about 1.1 m can be obtained.

Assuming that the thickness of the wiring 30 in the solar cell module 100 is 300 μm (that is, 3 × 10 ^-4 m) and the width of the wiring 30 is 6 mm (that is, 6 × 10 ^-3 m), the wiring 30 The cross-sectional area S is 1.8 × ^10-6 m ² .
Further, assuming that the annealed copper resistivity ρ at 20 ° C. is 1.72 × ^10-8 Ωm, the length of the wiring 30 is shortened by about 1.1 m as compared with the conventional example, so that the resistance value of the wiring 30 is reduced. R ₁ is calculated as follows.
R ₁ = ρ (mΩ) x (about 1.1 (m) / S (m ² ) = 1.72 x ^10-8 x (about 1.1 / 1.8 x ^10-6 ) = about 1.05 × 10 ^-2 Ω
Therefore, assuming that the operating current value I in the solar cell module 100 is 9A, the following loss of power consumption (ΔW) can be avoided by shortening the length of the wiring 30 by about 1.1 m.
ΔW = I ² · R ₁ = 9 × 9 × about 1.05 × 10 ^-2 Ω = 8.51 × 10 ^-1 W

Further, according to the wiring 30 provided in the solar cell module 100 which is formed substantially linearly in a plan view via the bypass diode 20, it is necessary to adopt a complicated arrangement like the wiring 930 of the conventional solar cell module 900. It is possible to simplify the arrangement of the wiring from the solar cell string (connection unit) to the bypass diode 20.

Further, as shown in FIGS. 13 and 14A, in the conventional solar cell module 900 in which the terminal box 970 including the bypass diode 920 is provided in the substantially central portion, the bypass is performed from the solar cell string (connection unit). Not only is the length of the wiring 930 leading to the diode longer than the wiring 30 of the solar cell module 100, but the wiring 930 is formed in two rows so as not to contact each other. Therefore, the solar cell module 900 of the conventional example requires a wiring area wider than the wiring area of the solar cell module 100 of the present embodiment. Therefore, since it is possible to reduce the wiring area of the solar cell module 100 of the present embodiment as compared with the conventional case, the sun in which one solar cell module can be arranged even if the outer shape is the same. It is possible to increase the number of battery cells as compared with the solar cell module 900, or it is possible to realize miniaturization or space saving of the solar cell module even with the same amount of power generation.

As described above, by adopting the configuration of the solar cell module 100 of the present embodiment, it is possible to realize miniaturization or space saving of the solar cell module, simplification of the configuration of the solar cell module, and / or high-efficiency output. At the same time, the solar power generation system 800 described later can be realized.

By the way, even if a change in the position of the wiring in the direction orthogonal to the paper surface of FIG. 1 is formed, if the wiring is linear in a plan view, it is included in the meaning of the term "substantially linear". Also, the term "substantially straight" does not require it to be a perfect straight line, but includes those that are substantially straight lines as a whole. For example, in the direction orthogonal to the extending direction of the wiring 30, there is typically a deviation (or shaking) of more than 0 mm and 30 mm or less (more preferably, more than 0 mm and 20 mm or less) with respect to a perfect straight line. If it does occur, it is also included in the meaning of the term "substantially linear" in this embodiment.

In addition, if the outer shape of the base material 60 is curved, the wiring 30 along the curved line is also included in the "substantially straight line". Therefore, the "substantially linear wiring" in the present embodiment can be rephrased as "wiring formed along the outer shape of the base material (providing the wiring)". Further, the term "wiring formed along the outer shape of the base material" is also oriented in a direction orthogonal to each point in the extending direction of the wiring 30 as in the above-mentioned "substantially linear shape". , With reference to a perfect straight line, even if there is a deviation (or shaking) of more than 0 mm and 30 mm or less (more preferably, more than 0 mm and 20 mm or less), "to follow the outer shape of the base material. Included in the meaning of the term "formed wiring". Those skilled in the art can understand that it may be difficult to form a completely linear wiring due to the manufacturing process of the solar cell module or other circumstances.

Further, the material and properties of the base material 60 of the present embodiment are not particularly limited. For example, a typical example of the base material 60 is a known white plate tempered glass plate or transparent resin plate. Further, the base material 60 can be formed not only from a known material having rigidity but also from a known material having flexibility or slight elasticity. In addition, the material and properties of the frame body 60a are not particularly limited. For example, a typical example of the frame body 60a is a molded product made of aluminum.

Further, in the present embodiment, a so-called super straight structure in which light is incident on the solar cell 10 through a base material 60 having translucency is adopted, but the solar cell module 100 of the present embodiment is said to be the same. It is not limited to the structure. For example, a so-called substrate structure having a structure in which a solar cell 10 arranged on or above a base material 60 is sealed with a known translucent resin, or both sides of the solar cell 10 are made of glass. A so-called double glass structure, which is sandwiched between the base materials and allows light to enter from both sides, is another aspect that can be adopted.

<Second embodiment>
FIG. 7 is a perspective view of the back surface side of the solar cell module 200 of the present embodiment. Further, FIG. 8 is an enlarged perspective view of a part of the back surface side of the solar cell module 200 of the present embodiment. The solar cell module 200 has four solar cells 10, and the connection wiring 32, the wiring 30, and the series connection wiring 42, which are partially bent in a substantially U shape, are solar cells. It is the same as the solar cell module 100 of the first embodiment except that it is arranged not on the front surface side of the module 100 but on the back surface side thereof. Therefore, the description overlapping with the first embodiment may be omitted.

As shown in FIG. 7, the solar cell module 200 of the present embodiment includes four solar cell 10s (SC1 to SC4). Further, FIGS. 7 and 8 show a configuration viewed from the back surface side of the solar cell module 200, that is, the side opposite to the light receiving surface of the solar cell 10, and the back surface protection described in the first embodiment. The material and the transparent filling material are not shown as in the first embodiment. Further, in both FIGS. 7 and 8, the cover of the terminal box is not shown in order to make the configuration inside the terminal box easy to understand.

In the solar cell module 200 of the present embodiment, the wiring 30 formed substantially linearly in a plan view via the bypass diode 20, in other words, the outer shape of the base material 60 (one side of the rectangle in the present embodiment). The wiring 30 formed along the line is arranged in the wiring area on the back surface side of the solar cell module 200. Therefore, after the current formed by the power generation of each solar cell 10 is collected in the wiring 30, the conductive molded body 34 electrically connected to the wiring 30 and the output wiring supported by the support portion 71 ( It is sent out to the outside of the solar cell module 200 through the terminal cable) 72. In the present embodiment, unlike the solar cell module 100 of the first embodiment, the wiring 30 may be arranged at a position covering a part of the back surface side of the light receiving surface of the solar cell 10. Therefore, the wiring region in the present embodiment includes the region on the back surface side of the solar cell 10 in addition to the region where the solar cell 10 is not arranged.

Here, in the solar cell module 200 of the present embodiment, as shown in FIG. 8, a plurality of solar cell 10s electrically connected by the interconnector 12 (12a, 12b, 12c) are connected from the interconnector 12. , It is connected to the wiring 30 via the connection wiring 32 which is partially bent toward the back surface side in a substantially U shape.

Therefore, in the present embodiment, the four solar cells 10 (SC1 to SC4) electrically connected in series using the interconnector 12 (12a, 12b, 12c) and the series connection wiring 42 are the first. Corresponds to the connection unit 40 of the embodiment. Further, the combination of the connection unit of the solar cell module 200 and the bypass diode 20 electrically connected in parallel with the connection unit using the wiring 30 corresponds to the combination unit 50 of the first embodiment. ..

Further, as described above, the four solar cells 10 are electrically connected in series, but from a different point of view, there are two solar cells 10 (SC1 and SC2) electrically connected in series. , Another set of two solar cells 10 (SC3 and SC4) electrically connected in series are electrically connected in parallel with the bypass diode 20 using or via wiring 30. become.

As in the solar cell module 200 of the present embodiment, the wiring 30 is arranged not on the front surface side of the solar cell module 200 but on the back surface side thereof, so that the wiring region is as in the solar cell module 100 of the first embodiment. There is no need to provide. As a result, the area for arranging the solar cell 10 can be expanded as compared with the case where the wiring 30 is arranged on the surface side of the solar cell module. Further, the size and space of the solar cell module 200 itself can be easily reduced as compared with the case where the wiring 30 is arranged on the surface side of the solar cell module.

As described above, by adopting the solar cell module 200 of the present embodiment, it is possible to realize a solar cell module capable of obtaining highly efficient output, and thus a photovoltaic power generation system. Further, according to the solar cell module 200, the number of solar cell cells included in one solar cell module can be increased as compared with the conventional one, or the solar cell module itself can be miniaturized or space-saving. obtain.

<Modified example of the second embodiment>
FIG. 9 is an enlarged perspective view of a part of the back surface side of the solar cell module 200 of the second embodiment, which corresponds to FIG. 8 of the second embodiment, as a modification. Therefore, also in this modification, the back surface protective material and the transparent filling material described in the first embodiment are not shown as in the first embodiment. Further, similarly to FIGS. 7 and 8, in FIG. 9, the cover of the terminal box is not shown in order to make the configuration inside the terminal box easy to understand.

The solar cell module of this modification is provided with an insulating sheet 62 having low translucency so as to overlap most of the positions of the connection wiring 32 and the position of the wiring 30 on the back surface side thereof. It is the same as the solar cell module 200 of the second embodiment. Therefore, duplicate description may be omitted.

Specifically, unlike the solar cell module 200 of the second embodiment, most positions and wiring 30 of the connection wiring 32 partially bent in a U shape on the back surface side of the solar cell module. The insulating sheet 62 having low translucency is arranged so as to overlap with the position of. By arranging such an insulating sheet 62, the insulation property between the solar cell 10 and the wiring 30 or the connecting wiring 32 can be obtained with higher accuracy, and for example, when viewed from the surface side of the solar cell module. In addition, the insulating sheet 62 can obscure or obscure the wiring 30 and the connection wiring 32. The insulating sheet 62 of this modification is adopted as long as it is translucent so as to achieve the above-mentioned effect.

As described above, by adopting the solar cell module of this modification, it is possible to realize a solar cell module capable of obtaining highly efficient output, and eventually a photovoltaic power generation system. Further, according to the solar cell module, the number of solar cell cells included in one solar cell module can be increased as compared with the conventional one, or the solar cell module itself can be miniaturized or space-saving. obtain. Further, even if the wiring 30 is arranged on the back surface side of the solar cell module, the presence of the wiring 30 is difficult to see from the front surface side of the solar cell module due to the insulating sheet 62, so that the solar cell module of this modified example also has aesthetics. obtain.

<Other Embodiments (1)>
FIG. 10 is a plan view of the solar cell module 300 of the present embodiment. In the solar cell module 300 of the present embodiment, the wiring 30 formed substantially linearly in a plan view via the bypass diode 20 and the series connection wiring 42 are arranged on the surface side of the solar cell module 300. It is the same as the solar cell module 200 of the second embodiment except for. Therefore, the description overlapping with the second embodiment may be omitted. In this embodiment as well, as in the other embodiments, from a different point of view, the outer shape of the base material 60 is rectangular, so that the wiring 30 is the outer shape of the base material 60 (in this embodiment, one side of the rectangle). ) Can be said to be formed.

By adopting the solar cell module 300 of the present embodiment, it is possible to realize a solar cell module capable of obtaining highly efficient output, and thus a photovoltaic power generation system. Further, according to the solar cell module 300, the number of solar cell cells included in one solar cell module can be increased as compared with the conventional one, or the solar cell module itself can be miniaturized or space-saving. obtain.

<Other Embodiments (2)>
Further, in each of the above-described embodiments, an example in which the number of solar cells 10 included in the solar cell modules 100 and 200 is four or more is described, but the solar cells included in the solar cell modules 100 and 200 in each embodiment are described. The number of cells is not limited to four or more. FIG. 11 is a plan view of the solar cell module 400 of the present embodiment. As shown in FIG. 11, the solar cell module 400 includes two solar cell cells 10, and a wiring 30 formed substantially linearly in a plan view on the surface side of the solar cell module 400 via a bypass diode 20. In other words, the wiring 30 formed along the outer shape of the base material 60 (in this embodiment, the long side of the rectangle) is arranged.

In the present embodiment, the typical length of the wiring 30 (Lw _{2 in} FIG. 11) is about 300 mm or more, and is equal to or less than the length of the long side of the base material 60 (Ls _{2 in} FIG. 11). .. Further, similarly to the first embodiment, the length (Lw _{2 of} FIG. 11), the width, and the thickness of the wiring of the wiring 30 of the present embodiment are not particularly limited as long as the effect of the present embodiment is exhibited. ..

Further, if the outer shape of the base material 60 is a perfect rectangle, the length of the wiring 30 is the same as or shorter than the length of the short side of the base material 60 (Ls _{2 in} FIG. 11). It is possible to simplify the arrangement of wiring from one solar cell 10 (which also serves as a connection unit in this embodiment) to the bypass diode 20.

Even in the solar cell module 400 having two solar cell 10s as in the present embodiment, high-efficiency output is realized as compared with the conventional solar cell module having the same number of solar cells 10. obtain. Therefore, a solar cell module including two solar cells will exhibit at least a part of the effect of the solar cell module of the first embodiment, the second embodiment, or the modification of the second embodiment. obtain.

<Other Embodiments (3)>
FIG. 12 is a plan view of the solar cell module 500 of the present embodiment. In the solar cell module 500 of the present embodiment, similarly to the solar cell module 200 of the second embodiment, the wiring 30 and the series connection wiring 42 are arranged not on the front surface side of the solar cell module 500 but on the back surface side thereof. There is. In addition, a known conductive interconnector 12 for electrically connecting a plurality of solar cell 10s in series for each row is also arranged on the back surface side of the solar cell module 500. Except for each of the above points, the solar cell module 500 of the present embodiment is the same as the solar cell module 100 of the first embodiment or the solar cell module 200 of the second embodiment, so that duplicate description is omitted. obtain.

Further, also in the present embodiment, the wiring 30 is formed substantially linearly in a plan view via the bypass diode 20, in other words, along the outer shape of the base material 60 (in this embodiment, one side of a rectangle). ing. In addition, the present embodiment includes the same number of solar cell 10, connection unit 40, and combination unit 50 as the solar cell module 100 of the first embodiment.

Therefore, according to the solar cell module 500 of the present embodiment, the same effect as that of the solar cell module 100 of the first embodiment can be obtained, and the same effect as that of the solar cell module 200 of the second embodiment can be obtained. The area for arranging the solar cell 10 can be expanded as compared with the case where the wiring 30 is arranged on the surface side of the solar cell module. Further, the size and space of the solar cell module 500 itself can be easily reduced as compared with the case where the wiring 30 is arranged on the surface side of the solar cell module.

The disclosure of each of the above-described embodiments is described for the purpose of explaining those embodiments, and is not described for the purpose of limiting the present invention. In addition, modifications that exist within the scope of the invention, including other combinations of each embodiment, are also within the scope of the claims.

10 Solar cell cells 12, 12a, 12b, 12c Interconnector 20 Bypass diode 22 Lead terminal 22a Lead terminal end 25 Resin 30, 30a, 30b Wiring formed in a substantially linear shape 30e Wiring formed in a substantially linear shape End 32 Connection wiring 34 Conductive molding 40 Connection unit 42 Series connection wiring 50 Combination unit 60 Base material 60a Frame body 62 Insulation sheet 70 Terminal box 71 Support part 72 Output wiring (terminal cable)
72a Connector 74 Connection 80 Junction box 82 Switch 84 Power conditioner 100, 200, 300, 400, 500 Solar cell module 800 Photovoltaic system 900 Conventional solar cell module 910 Conventional solar cell 920 Conventional bypass diode 930 Wiring of conventional solar cell module 960 Conventional base material 970 Conventional terminal box

Claims (8)

Wiring formed substantially linearly in a plan view via a bypass diode,
A combination unit consisting of a connection unit in which a plurality of solar cells are electrically connected in series and connected to the wiring, and a bypass diode electrically connected in parallel with the connection unit using the wiring.
A plate-shaped base material including the wiring and the combination unit.
Solar cell module. With a plate-shaped base material
Wiring formed along the outer shape of the base material in plan view via a bypass diode,
A connection unit in which a plurality of solar cells are electrically connected in series and connected to the wiring, and a combination unit consisting of the bypass diode electrically connected in parallel with the connection unit using the wiring. Prepare,
The base material comprises the wiring and the combination unit.
Solar cell module. The wiring is also a wiring for electrically connecting a plurality of the connection units in series.
The solar cell module according to claim 1 or 2. The base material is substantially rectangular
The length of the wiring is the same as or shorter than the length of the short side of the base material, assuming that the base material is a perfect rectangle.
The solar cell module according to any one of claims 1 to 3. The width of the wiring is 20 times or more longer than the thickness of the wiring.
The bypass diode includes a flat plate-shaped lead terminal having a width of 0.9 times or more and 1.1 times or less the width of the wiring.
The solar cell module according to any one of claims 1 to 4. The wiring region of the base material on the light receiving surface side of the solar cell includes the wiring.
The solar cell module according to any one of claims 1 to 5. The wiring region of the base material on the back surface side opposite to the light receiving surface side of the solar cell includes the wiring.
The solar cell module according to any one of claims 1 to 5. The solar cell module according to any one of claims 1 to 5.
Solar power system.