JP2003282911A - Solar cell module array and method of manufacturing the same, and solar cell module and method of manufacturing the same - Google Patents

Abstract

(57) [Problem] To provide a solar cell module array capable of improving work efficiency without lowering the reliability of the solar cell module at the time of serial-parallel connection work between solar cell modules. SOLUTION: On a support, a solar cell module having two output terminals each for a positive electrode and a negative electrode, and output terminals having the same polarity are electrically connected to each other by an extraction electrode,
N rows in the vertical direction by aligning the direction of the output terminals of the positive electrode and the negative electrode,
M columns are arranged in the horizontal direction, and n rows and m columns (1 ≦ n ≦ N−1, 1
≦ m ≦ M−1), the extraction electrodes of one polarity of the solar cell module are the extraction electrodes of the opposite polarity in the n-th row and m + 1 column, the extraction electrodes of one polarity in the n + 1-th row and the m-th column, and n +
An electrical connection is made at one location with an extraction electrode of the opposite polarity in the first row and m + 1 column.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a solar cell module array and a method for manufacturing the same, and a solar cell module and a method for manufacturing the same.

[0002]

2. Description of the Related Art Since solar energy is an inexhaustible and clean energy, attention is increasing year by year with the depletion of fossil fuels and serious environmental problems. Currently, the solar power generation system that uses solar energy to generate electricity is
It is installed in various places such as roofs of ordinary houses and walls of high-rise buildings.

A general solar power generation system is provided with a plurality of solar cell modules, and the solar cell modules are connected in series and / or in parallel to form a solar cell module array. An example of the wiring diagram is shown in FIG.

A solar cell module 10 having two positive and negative output terminals is provided on a support (not shown) with the positive and negative output terminals aligned in the vertical direction and row A,
B rows are arranged in the horizontal direction. Here, the solar cell modules are connected in series horizontally and in parallel vertically.

One parallel connecting member 11 is provided between each row of the solar cell modules 10, and the parallel connecting member 11 includes one conductive member 12 and a plurality of branch wires 13 formed by a ring sleeve 14. It is electrically connected.

The branch lines of the parallel connection members arranged between the b-th column (1.ltoreq.b.ltoreq.B-1) and the solar cell modules in the b + 1-th column are in the b-th column and the b + 1-th column. The output terminals 15 of the solar cell modules are electrically connected by the ring sleeve 16, and the solar cell modules are connected in series and parallel.

Further, the solar cell module array includes
A bypass diode 17 is usually provided. When a part of the solar cell module is shaded, the solar cell module in the non-power generation state that is not exposed to sunlight is reversed from the solar cell module in the power generation state electrically connected in series with the solar cell module in the non-power generation state. A bias voltage is applied, and the solar cell module is likely to be damaged. However, by providing the bypass diode between the parallel connection members, the bypass current flows through the parallel connection member to the bypass diode. As a result, it is possible to prevent the reverse bias voltage from being applied to the solar cell module in the non-power generation state and the damage to the solar cell module in the non-power generation state.

At this time, a bypass current larger than the current generated in one solar cell module flows into the parallel connection member depending on the number of solar cell modules in a non-power generation state. Therefore, it is necessary to increase the diameter of the parallel connection member.

[0009]

However, the provision of the parallel connection member in the solar cell module array causes the following problems.

[0010]. Since the parallel connection member is an elongated member that connects a plurality of solar cell modules in parallel, it is generally transported to the site in a rolled state. When the parallel connection member is arranged between the solar cell modules and the parallel connection member and the output terminal of each solar cell module are electrically connected, the curled parallel connection member is difficult to handle, and thus the solar cell module is erroneously handled. Contact may damage the surface of the solar cell module. As a result, the reliability and output characteristics of the solar cell module may be deteriorated. Further, if an operator carefully works so as not to damage the surface of the solar cell module, the working time becomes long and the working efficiency is lowered.

[0011]. Since the parallel connection member is long, there is a high possibility that it will be accidentally hooked during the work. When the parallel connection member receives a mechanical force, the mechanical force is also applied to the output terminals of all the solar cell modules electrically connected to the parallel connection member. Usually, the parallel connection member is thicker than the output terminal of the solar cell module, and therefore, when mechanical force is applied to the parallel connection member, the force is concentrated on the output terminal of the solar cell module, and the output terminal is likely to be disconnected.

[0012]. It is necessary to previously provide a branch line for electrically connecting the output terminal of the solar cell module to the parallel connection member. The branch line needs to be provided in accordance with the position of the output terminal of each solar cell module, which requires time for the work.

The present invention has been devised to solve the above-mentioned problems, and improves the work efficiency without degrading the reliability of the solar cell modules when the solar cell modules are connected in series and in parallel. It is a main object to provide a solar cell module array that can be designed.

[0014]

[Means for Solving the Problems] Means for solving the above problems will be described below.

The solar cell module array of the present invention has two positive and negative output terminals, and the output terminals having the same polarity are electrically connected to each other by the take-out electrodes, and each take-out electrode has two output terminals. A solar cell module having a take-out portion, wherein the solar cell module is arranged on a support in such a manner that the output terminals of the positive electrode and the negative electrode are aligned in the vertical direction N
The solar cell module is arranged in rows and M columns in the horizontal direction, and is present in the n-th row and m-th column (1≤n≤N-1, 1≤m≤M-1) of the solar cell module, which has one polarity. But n rows m +
It is characterized in that it is electrically connected at one place to the take-out portion having the opposite polarity in the first column, the take-out portion having the one polarity in the (n + 1) th row and the m-th column, and the take-out portion having the opposite polarity in the (n + 1) th row and the (m + 1) th column. .

According to the solar cell module array of the present invention, the series-parallel connection of the solar cell modules can be performed without using the parallel connection member which has been conventionally required. This eliminates the problem of parallel connection members contacting the solar cell modules and reducing reliability during the series-parallel connection work between the solar cell modules, and work carefully so that the parallel connection members do not contact the solar cell modules. Therefore, it is possible to improve workability.

Further, since the parallel connection member is unnecessary,
It is not necessary to electrically connect the output terminals of each solar cell module to the branch lines provided in the parallel connection member, and as a result,
Since the number of locations for electrical connection is reduced, it is possible to reduce the material required for the electrical connection work, such as the ring sleeve, and to shorten the working time.

A further feature of the solar cell module array of the present invention is that "the solar cell module has a photovoltaic element group including at least one photovoltaic element to which the output terminal is connected. The electromotive force element group is sealed by a covering material except for the tip of each output terminal "," the photovoltaic element is at least a transparent electrode layer,
Two output terminals having a photoelectric conversion layer and a back surface electrode layer and having the same polarity are electrically connected through a transparent electrode layer or a back surface electrode layer "," the coating material is the photovoltaic material. At least 10 mm protruding from the end of the power element group, and the extraction electrode is arranged on the light receiving surface side of the protruding coating material. ”,“ The extraction electrode is from the end of the photovoltaic element group. At least 5 mm apart "," the extraction electrodes are raised above the installation surface of the solar cell module, and the extraction electrodes are electrically connected to each other at the rising portion ",
"The output terminal and the take-out electrode have flexibility", "The take-out electrode is formed by bending a single conductive member in a U-shape", "The take-out electrode is not covered with conductive material. It consists of a sex member ”.

In the solar cell module array having the conventional bypass diode, the parallel connection member electrically connected was the main path of the bypass current. In the present invention, however, the extraction electrode of the solar cell module and the photovoltaic element are used. Part of this becomes the main path of the bypass current. As a part of the photovoltaic element, a transparent electrode layer, a back electrode layer and the like can be mentioned, but usually, a transparent electrode layer provided in the photovoltaic element,
The back electrode layer and the like are not designed assuming that a bypass current flows, and when a bypass current of a current equal to or higher than the assumed current flows in a part of the photovoltaic element, the transparent electrode layer or the back electrode layer is It may generate heat and be damaged.

Therefore, in order to prevent this, the lead-out electrode, which is made of a single conductive member bent in a U-shape, which can sufficiently cope with the bypass current, is electrically connected beforehand to the two output terminals having the same polarity. This makes it possible to further reduce the electric resistance between the output terminals, prevent a bypass current larger than the assumed current from flowing through a part of the photovoltaic element, and prevent heat generation.

Further, for example, when the extraction electrode is made of an uncoated conductive member and is in contact with a support which is the installation surface of the solar cell module, if the solar radiation is immediately after the rainfall, the rainwater is absorbed. A leakage current is generated between the take-out electrodes having different electric potentials via the support whose electric resistance value is lowered, and the take-out electrodes are corroded by the electrochemical reaction. However, as illustrated in FIG. 6, the coating material 45 is set to 1 so as to protrude from the end portion of the photovoltaic element 50.
The covering member 45 is formed so as to extend beyond 0 mm, and the extraction electrode 44 is arranged on the light receiving surface side of the protrusion.
Plays a role of an insulating sheet, and makes it difficult for leak current to flow between the extraction electrode 44 and the support (not shown).

If the lead-out electrode provided on the solar cell module is separated from the end of the photovoltaic element group by at least 5 mm, the lead-out electrode of the solar cell module is set up and placed on the support. At times, the extraction electrode is in a state of floating above the installation surface of the solar cell module. As a result, even if rainwater collects on the light-receiving surface of the solar cell module, it is unlikely that the support and the extraction electrode will make electrical contact through the rainwater, and leakage current will be less likely to occur.

Although a gap for electrically connecting the extraction electrodes to each other must be provided between the solar cell modules, the extraction electrodes are raised above the installation surface of the solar cell module for electrical connection. By that,
The required gap between the solar cell modules is reduced, and the power generation efficiency per area can be improved.

If the output terminal and the extraction electrode provided on the solar cell module are flexible, the extraction electrode can be bent even if the solar cell modules are not installed on the same plane. It can be easily electrically connected.

Further, when the take-out electrode is made of a conductive member which is not covered, it is not necessary to remove the covering material at the time of connecting work, and electrical connection can be easily made by a ring sleeve, solder or the like.

The present invention is also a method for manufacturing the solar cell module array of the present invention, which comprises a step of forming a support body which is a mounting surface of the solar cell module, and a step of standing the extraction electrode provided on the solar cell module. It is characterized in that it includes a step of raising and disposing the solar cell module on the support, a step of electrically connecting the extraction electrodes of the solar cell module, and a step of providing a bypass diode.

In the present invention, the extraction electrode of the solar cell module has a larger diameter than the output terminal because it serves as a path for bypass current. This is because the bypass current may be much larger than the generated current amount of one solar cell module. Therefore, if the extraction electrode is directly electrically connected to the photovoltaic element and then sealed with a covering material, the unevenness of the electrical connection portion of the solar cell module becomes larger than in the conventional case, and thus the sealing becomes difficult. Therefore, in the method for manufacturing the solar cell module array of the present invention, after sealing the photovoltaic element provided with the output terminal, by electrically connecting the extraction electrode to the output terminal protruding from the sealing member,
The solar cell module is easily sealed.

A further feature of the method for manufacturing a solar cell module array of the present invention is that "a step of raising the extraction electrode provided in the solar cell module to dispose the solar cell module on a support, Alternately performing the step of electrically connecting the extraction electrodes of the battery module to each other "and" using a ring sleeve in the step of electrically connecting the extraction electrodes of the solar cell module ".

When the electrical connection work between the extraction electrodes provided on the solar cell module is performed after the solar cell modules are all installed on the support body, a work that allows an operator to enter between the support bodies. It is necessary to provide space. As a result, in the solar cell module array,
It is not preferable because the non-power generation region where the solar cell module is not installed increases and the power generation efficiency per area decreases. That is, in order to increase the area efficiency of the solar cell module array, it is preferable to make the working space as small as possible.

Therefore, in the method for manufacturing a solar cell module array of the present invention, when the electrical connection for one row of the solar cell module is completed, the solar cell module is placed in the work space used immediately before, and It is preferable to alternately repeat the step of arranging the solar cell module on the support at the time of manufacturing and the step of electrically connecting the extraction electrodes of the solar cell module such that the work of electrically connecting is alternately repeated.

Specifically, when manufacturing a solar cell module array of N rows and M columns, first, the solar cell modules are installed in only two rows from the end of the support, and the solar cells provided in the first and second rows are installed. Electrically connect the extraction electrodes of the module.

Next, the solar cell module on the third row is installed in the position which was the working space when the electrical connection work of the solar cell modules provided on the first and second rows was performed.
The extraction electrodes of the solar cell modules provided in the second and third rows are electrically connected to each other.

In the same manner, the solar cell module of the nth row (1≤n≤N) is installed, and the extraction electrodes of the solar cell modules provided in the n-1th and nth rows are electrically connected to each other. Repeat until the last line.

In this way, the work is performed sequentially from the end, and the work is completed line by line, whereby the work of installing the solar cell module and the work of electrically connecting the extraction electrodes are
Since the operation can be performed while standing on the planned installation area where the solar cell module on the support is not installed, it is not necessary to provide a work space between the supports. As a result, the power generation efficiency per area can be improved.

Further, in the step of electrically connecting the extraction electrodes of the solar cell module to each other, if a ring sleeve is used for the electrical connection portion, a plurality of extraction electrodes can be easily bundled, so that work efficiency can be improved.

The solar cell module of the present invention has a photovoltaic element group consisting of at least one photovoltaic element, and each photovoltaic element group has two positive and negative output terminals. The photovoltaic element group is provided, and the photovoltaic element group is sealed by a covering material except for the tip end portion of each output terminal, and the exposed portion of two output terminals having the same polarity is one conductive member. Is electrically connected to a lead-out electrode made of, and the lead-out electrode is disposed on the light-receiving surface side of the covering material.

Further, in the method for manufacturing a solar cell module of the present invention, the step of forming a photovoltaic element group having at least one photovoltaic element, and two output terminals each for the positive electrode and the negative electrode of the photovoltaic element group. The step of providing each one, the step of sealing the photovoltaic element group provided with the output terminal with a covering material except for the tip of each output terminal, and the step of sealing the photovoltaic element group, and then having the same polarity The method is characterized by including the step of electrically connecting the extraction electrodes to the exposed portions of the two output terminals.

By using the above-mentioned solar cell module according to the present invention, the above-mentioned solar cell module array of the present invention can be easily manufactured.

[0039]

BEST MODE FOR CARRYING OUT THE INVENTION Preferred embodiments of the solar cell module array of the present invention will be described in detail below.
The present invention is not limited to the embodiments described below.

FIG. 2 shows a plan view of the solar cell module showing an example of the present invention as seen from the light receiving surface side, and FIG. 3 shows an electrical connection diagram of the solar cell module array.

The solar cell module 20 constituting the solar cell module array of this example has one photovoltaic element 21.
The photovoltaic element group is made up of, and each of the photovoltaic element group is provided with two positive and negative output terminals 22. The photovoltaic element group is sealed by a covering material 23 except for the tip of each output terminal, and the two exposed output terminals having the same polarity have a single exposed conductive member. It is electrically connected to the electrode 24. Further, each of the positive electrode and the negative electrode extraction electrode has two extraction portions 25.

The covering material 23 is provided so as to protrude from the end of the photovoltaic element group, and the extraction electrode 24 is arranged on the light receiving surface of the protruding covering material.

The method of manufacturing the solar cell module of this example is as follows.
The step of forming the photovoltaic element group, the step of providing two output terminals 22 for each of the positive electrode and the negative electrode of the photovoltaic element group, and the photovoltaic element group provided with the output terminal 22 at the tip of each output terminal. Excluding the parts, a step of sealing with the covering material 23, a step of sealing the photovoltaic element group, and a step of electrically connecting the extraction electrode 24 to the exposed portions of the two output terminals having the same polarity are included.

The solar cell modules 20 are arranged on a support (not shown) in such a manner that the output terminals of the positive electrode and the negative electrode are arranged in the same direction and arranged in N rows in the vertical direction and M columns in the horizontal direction.

The n-th row and m-th column (1≤n≤N-1,
1 ≦ m ≦ M−1), the one-polarity (positive electrode in this example) lead-out portion of the solar cell module is the opposite polarity (negative pole in this example) lead-out portion in the n-th row and m + 1-th column, n + 1-row and m-th column. It is electrically connected at one place to the first polarity take-out portion and the opposite polarity take-out portion at the (n + 1) th row and the (m + 1) th column.

Also, one bypass diode 26 is provided for each column.
Is provided to prevent a reverse bias current from flowing in the solar cell module which is shaded and in a non-power generation state.

The solar cell module array of this example is first transported to the site where the solar cell module is to be constructed, and the extraction electrodes of the solar cell module are set up on a previously formed support, and the extraction electrodes are connected to each other. The solar cell modules are connected in series and parallel by electrical connection, and finally a bypass diode is provided.

The constituent features of the present invention will be described in more detail below.

[Photovoltaic Element Group] In the present invention, the photovoltaic element group means a single photovoltaic element or a series connection body or a parallel connection body of two or more photovoltaic elements.

The photovoltaic element constituting the photovoltaic element group of the present invention includes at least a substrate, a photoelectric conversion layer, a transparent electrode layer,
It has a back surface reflection layer and a back surface electrode layer. The ends of the photovoltaic element group are, in the photovoltaic element that constitutes the photovoltaic element group, the base material, the transparent electrode layer, the photoelectric conversion layer, and the back surface that constitute the photovoltaic element to which the output terminal is attached. The term means the end surface of the laminate including the reflective layer and the back electrode layer on the output terminal side, and does not mean the end of the bus bar electrode and the output terminal provided in the photovoltaic element.

The following further describes the photoelectric conversion layer, transparent electrode layer, back surface reflection layer, and back surface electrode layer.

(Photoelectric conversion layer) The photoelectric conversion layer has a function of converting light into electricity. The material of this photoelectric conversion layer is S
Group V elements such as i, C and Ge, IV such as SiGe and SiC
Group element alloys, GaAs, InSb, GaP, GaSb,
III-V group compounds such as InP and InAs, ZnSe,
I such as CdTe, ZnS, CdS, CdSe, CdTe
I-VI group compounds, I-III-VI such as CuInSe
Examples thereof include, but are not limited to, group compounds.

The photoelectric conversion layer forms at least one pair of pn junction, pin junction, heterojunction, or Schottky barrier. Further, as a preferable method for forming the photoelectric conversion layer, a microwave plasma CVD method, VHF plasma CV
Various chemical vapor deposition methods such as the D method and the RF plasma CVD method can be cited.

(Transparent Electrode Layer) The transparent electrode layer is an electrode on the light incident side that transmits light, and also functions as an antireflection film by optimizing the film thickness.

The transparent electrode layer is required to have a high transmittance in the wavelength region that can be absorbed by the photoelectric conversion layer and have a low electric resistance. The materials thereof are In ₂ O ₃ and Sn.
O ₂ , ITO (In ₂ O ₃ + SnO ₂ ), ZnO, CdO,
Cd ₂ SnO ₄ , TiO ₂ , Ta ₂ O ₅ , Bi ₂ O ₃ , Mo
A conductive oxide such as O ₃ or Na _x WO ₃ or a mixture thereof is preferably used.

As a method of forming the transparent electrode layer, a method of forming by sputtering using a sputtering gas containing a trace amount of oxygen is preferably used.

(Backside Reflection Layer) The backside reflection layer has a function as a light reflection layer for reflecting light, which is not completely absorbed by the photoelectric conversion layer, back to the photoelectric conversion layer.

As the material of the back reflection layer, Au, Ag,
Cu, Al, Ni, Fe, Cr, Mo, W, Ti, C
Examples thereof include metals such as o, Ta, Nb, and Zr, and alloys such as stainless steel. Among them, metals having high reflectance such as Al, Cu, Ag, and Au are particularly preferable.

(Backside Electrode Layer) The backside electrode layer has a function as a collecting electrode for collecting electric charges generated on the non-light-receiving surface side of the photoelectric conversion layer. Specific materials include Al, Au, A
Examples thereof include metals such as g, Cu, Ti, Ta, and W, but are not limited thereto. As a method of forming the back electrode layer, a chemical vapor deposition method, a sputtering method or the like is preferably used. Further, as the back electrode layer, a conductive substrate having a function as a support substrate for supporting each layer so as not to be damaged by an externally applied force is preferably used. Specific materials for the conductive substrate include Fe, Ni, Cr and A.
Examples thereof include, but are not limited to, thin films of metals such as 1, Mo, Au, Nb, Ta, V, Ti, Pt, and Pb or alloys thereof, and composites thereof.

(Base Material) The base material has a function as a support substrate for supporting each layer constituting the photovoltaic element so as not to be damaged by a mechanical force applied from the outside. Specific materials for the base material include Fe, Ni, Cr, Al and M.
Examples thereof include thin films of metals such as o, Au, Nb, Ta, V, Ti, Pt, and Pb or alloys thereof, composites thereof, glass, and the like, but are not limited thereto.

[Output Terminal] The output terminal is a wiring member for taking out the electric power generated in the photovoltaic element group to the outside, and the solar cell module of the present invention has two positive and negative electrodes.
Output terminals are formed for each book. The output terminal is electrically connected to the positive electrode and the negative electrode of the photovoltaic element that constitutes the solar cell module. As the connection method, silver paste, conductive tape, solder, spot welding or the like is preferably used.

Examples of the material for the output terminal include uncoated copper wire, copper foil, silver-plated copper foil, tin-plated copper foil and the like.

The output terminal is manufactured by cutting a conductive member into a desired length. At this time, it is preferable to remove burrs generated on the cut surface of the output terminal. When a photovoltaic element to which an output terminal having a burr is electrically connected is sealed with a covering material, the covering material may be broken by the burr of the output terminal and the sealing performance may be deteriorated, leading to a decrease in reliability. Is high.

The positive electrode and the negative electrode of the photovoltaic elements forming the photovoltaic element group are formed long in advance, and the positive electrode and the negative electrode which are not electrically connected to the adjacent photovoltaic elements are used as the output terminals. It goes without saying that things are possible.

[Extracting Electrode] In the extracting electrode of the present invention, one extracting electrode is electrically connected to each of two positive and negative output terminals having the same polarity, and each extracting electrode is provided with two extracting portions. Has been.

The above-mentioned output terminal is formed with a resistance value such that the power loss generated when the power generated by the photovoltaic element group is extracted to the outside can be ignored. On the contrary,
The extraction electrode also functions as a bypass electric wire for allowing a bypass diode to escape a bypass current generated when a part of the solar cell module forming the solar cell module array is shaded after the solar cell module array is installed. The bypass current is usually much larger than the current assumed by the output terminal. Therefore, the extraction electrode has a resistance value that does not cause heat generation or damage to the photovoltaic element due to the bypass current. Therefore, it is usually set larger than the cross-sectional area of the output terminal.

For example, in the solar cell module array shown in FIG. 3, the bypass current flowing through the bypass diode provided in the m-th row shades all the solar cell modules in the m-th row (1≤m≤M). When the power is not yet generated, it becomes equal to the optimum operating current of the solar cell module array and becomes maximum. Therefore, in the present invention, the diameter of the extraction electrode needs to be determined so that the optimum operating current of the solar cell module array may flow. In particular,
A single wire or a twisted wire having a cross-sectional area of the conductive portion of 2 mm ² or more and 250 mm ² or less is preferably used. In the present invention, it is more preferable that the cross-sectional area of the extraction electrode satisfies the conditions shown in Table 1 according to the optimum operating current of the solar cell module.

[0068]

[Table 1]

As a specific material for the extraction electrode, an electric wire or cable wire whose surface is coated with polyethylene terephthalate, polyvinyl chloride, polyvinylidene chloride, or the like, or an uncovered copper wire, silver-plated copper wire, tin-plated copper wire However, the present invention is not limited to this.

[Support] The support has a function as a mount for installing the solar cell module and a reinforcing plate for giving the solar cell module mechanical strength.

The support preferably has excellent weather resistance and long-term reliability, and the material thereof is a concrete block,
A galvanized steel sheet, a steel sheet having a weather resistant substance such as fluororesin or vinyl chloride, and a stainless steel sheet are preferably used. As a means for fixing the solar cell module to the support, an adhesive, a double-sided tape, a screw, or the like is preferably used, but the means is not limited to this.

[0072]

EXAMPLES The present invention will be described in detail below based on examples.

(Embodiment 1) FIG. 4A is a plan view of the solar cell module array of this embodiment as seen from the light receiving surface side, and FIG. 4A is a perspective view of a portion surrounded by a broken line. Figure 4 (b)
4 is a side view seen from the direction of the arrow in FIG.
It shows in (c). Further, FIG. 5 shows an electrical connection diagram of the solar cell module array of the present embodiment. Moreover, the solar cell module which comprises the solar cell module array of a present Example is shown in FIG.

FIG. 7A shows the photovoltaic element 50 of this embodiment.
7B is a cross-sectional view taken along the line AA ′ in FIG. 7A, and FIG. 7C is a bottom view of the photovoltaic element 50.

The photovoltaic element 50 comprises a resin layer 51, a transparent electrode layer 52, a photoelectric conversion layer 53, a back surface reflection layer 54, and a back surface electrode layer 55 from the light receiving surface side. Urethane resin, transparent electrode layer 52 is ITO, photoelectric conversion layer 53 is P-I-N type amorphous silicon, back surface reflection layer 54 is ZnO and Al, back surface electrode layer 55.
Are made of stainless steel. Further, the light receiving surface of the transparent electrode layer 52 has an electrode 5 made of silver-plated copper foil.
6, an electrode 5 made of copper foil on the non-light-receiving surface of the back electrode layer 55
7 is provided.

Solar cell module 40 of this example (FIG. 6)
Has a photovoltaic element group in which two photovoltaic elements 50 are connected in series. Electrode 4 on the positive electrode side of the photovoltaic element group
2 and the electrode 43 on the negative electrode side are not covered with insulation φ
Two output terminals 44 each made of a 0.8 mm copper wire are electrically connected by solder 47.

An ethylene-tetrafluoroethylene film (ETFE) and E were formed on the light-receiving surface side of the photovoltaic element group.
A laminated body of VA sheets is provided with EVA sheets on the non-light-receiving surface side, and the photovoltaic element group is sealed by a covering material 45 made of these sheets.

The coating material 45 is provided so as to protrude by about 10 mm from the end face of the base material of the photovoltaic elements forming the photovoltaic element group (see FIG. 6 (a)), and each output terminal from the coating material. The tip of 44 projects about 15 mm.

In the unsealed regions of the two output terminals having the same polarity, one conductive member made of a non-insulated φ1.6 mm copper wire was formed by bending it into a U-shape. The extraction electrode 46 is electrically connected using a ring sleeve 48 as shown in FIG. Here, the extraction electrode is located 5 mm outside from the end of the photovoltaic element group and on the light receiving surface of the protruding portion of the coating material. By disposing the take-out electrode 46 on the light-receiving surface of the covering material 45, the take-out electrode is prevented from coming into direct contact with the support, and a leak current flowing through moisture such as rainwater between the positive electrode and the negative electrode is prevented. Can be suppressed.

If the extraction electrode 46 is provided on the surface of the coating material 5 mm outside the base end of the photovoltaic element, it is not necessary to bend the extraction electrode when the extraction electrode is started up during construction, and it is easy to do so. It is possible to perform the work of starting the extraction electrode. As a result, the extraction electrode is fixed in a state of being separated upward from the installation surface (support) of the solar cell module, so even if water droplets collect on the solar cell module installation surface during rainfall, the extraction electrode does not contact the water droplets,
It is possible to prevent a leak current from being generated from the extraction electrode.

As shown in FIG. 4, the solar cell module 40 has a support 31 made of a hollow concrete block.
The output terminals for the positive electrode and the negative electrode are arranged on the upper side in the same direction, and each solar cell module is tightly fixed to the concrete block with an elastic elastic adhesive of epoxy type.
Further, the extraction electrode 46 provided in the solar cell module is erected in a direction perpendicular to the installation surface of the support 31.

In the solar cell module array of this example, 40 rows of solar cell modules are arranged east to west (first row from the east,
2nd column, ... 40th column, 4 rows in north-south (from south to 1)
The second electrode, the third electrode, the third electrode, the fourth electrode, the second electrode, the third electrode, the fourth electrode, the second electrode, the third electrode, the fourth electrode, the second electrode, the third electrode, the fourth electrode, the second electrode, the third electrode, the fourth electrode, the second electrode, the third electrode, the fourth electrode, the third electrode, the third electrode, and the like The n-th row and m + 1-th column negative electrode, the n + 1-th row and m-th column positive electrode, and the n + 1-th row and m + 1-th column negative electrode are electrically connected by a ring sleeve 32 at one location.

Further, one bypass diode 34 is provided in each column as shown in FIG. 5, and the bypass diode 34 is provided between the positive electrode and negative electrode extraction electrodes provided in each solar cell module in the fourth row. The two attached electric wires are electrically connected by a ring sleeve.

By making the electrical connection as described above, it is possible to omit the conventionally required parallel connecting member, and an accident occurs that the parallel connecting member comes into contact with the surface of the solar cell module at the time of construction and is scratched. Can be prevented. Further, since the number of places where electrical connection work should be performed during the construction is reduced, the work time can be shortened significantly.

Example 2 A method for manufacturing the solar cell module of this example will be described below. The points not specifically mentioned here are the same as in the first embodiment.

The method of manufacturing the solar cell module of this example is as follows.
A step of connecting two photovoltaic elements in series to form a photovoltaic element group, a step of providing two output terminals for each of the positive electrode and the negative electrode of the photovoltaic element group, and a photovoltaic device having an output terminal. A step of sealing the power element group with a covering material excluding the tip of the output terminal, and after sealing the photovoltaic element group, electrically connect the extraction electrodes to the exposed portions of the two output terminals having the same polarity. It has steps in sequence.

The operation of connecting two photovoltaic elements in series is to arrange two photovoltaic elements with a gap of 5 mm between them.
This is performed by electrically connecting the electrode provided on the light receiving surface of one photovoltaic element to the electrode provided on the other non-light receiving surface by soldering.

The work of providing two output terminals for each of the positive electrode and the negative electrode of the photovoltaic element group in which two photovoltaic elements are connected in series is also performed using solder. The output terminal is an uncoated copper wire having a length of 40 mm and a diameter of 0.8 mm.

The operation of sealing the photovoltaic element group with the covering material is performed by using a single vacuum type laminating apparatus. The laminating method is as follows: EVA (460μ)
m) film, the solar cell module (light-receiving surface faces upward) on the EVA film, the ETFE (50 μm) / EVA (460 μm) film is arranged on the light-receiving surface of the solar cell module, and the exhaust speed is 10 ⁴ (Pa / sec), Vacuum degree 6
After evacuating at 70 (Pa) for 30 minutes, the laminating apparatus is placed in a hot air oven at 160 ° C., and vacuum heating is performed for 50 minutes.
After that, remove the laminating device from the hot air oven,
Sealing is completed by cooling at room temperature.

EVA film and ETFE / E before lamination
The size of the VA film is 5 from the end of the photovoltaic device group.
The protrusion is about 10 mm, but the protrusion extends to about 10 mm after lamination.

Finally, the exposed electrodes of the two output terminals having the same polarity are electrically connected with a ring sleeve to an extraction electrode made of an uncoated copper wire bent in a U-shape of φ1.6 mm. At that time, the extraction electrode is placed on the light receiving surface of the covering material. This is to prevent the take-out electrode from coming into contact with the support and generating a leak current after the construction.

The diameter of the take-out electrode is larger than the diameter of the output terminal because the bypass current flowing through the bypass diode when a part of the solar cell module is shaded is larger than the amount of current generated by one solar cell module. This is because it can be much larger. That is, it is necessary to increase the diameter of the extraction electrode of the solar cell module that serves as the path of the bypass current. If the extraction electrode having such a large diameter is directly electrically connected to the photovoltaic element and sealed with a covering material, the unevenness of the electrical connection portion of the solar cell module becomes large, which makes it difficult to seal. Therefore, in this example, after sealing the photovoltaic element provided with the output terminal with the covering material, the extraction electrode is electrically connected to the output terminal protruding from the covering material to seal the solar cell module. Making it easier.

(Example 3) A method of manufacturing the solar cell module array of this example will be described below. The points not specifically mentioned here are the same as in the first embodiment.

FIGS. 8 to 10 are views showing the work procedure at the time of manufacturing the solar cell module array of this embodiment.

In this example, a method of manufacturing a solar cell module array of 6 rows and 10 columns, which is formed by arranging 6 solar cell modules 60 in the north and south and 10 in the east and west, will be described.

When manufacturing a solar cell module array, first, the land to be set up is leveled, and a plurality of hollow concrete blocks are arranged on the leveled land to support 6
1 is formed.

After forming the support 61, as shown in FIG. 8, ten solar cell modules in the first row are provided on the north side of the support and the second row is provided immediately south of the solar cell modules in the first row. Install 10 solar cell modules. The installation work of the solar cell module includes a step of applying an epoxy-based elastic adhesive to the non-light-receiving surface of the solar cell module, a step of raising the extraction electrode provided in the solar cell module,
It comprises a step of closely fixing the solar cell module on a support made of a hollow concrete block.

After installing the solar cell modules in the first and second rows, the one-polarity take-out portion of the solar cell module existing in the m-th column (1≤m≤9) in the first row is placed in the first row, m + 1-th column. An electrical connection is made at one location with the opposite polarity take-out portion, the second-row m-th column first-polarity take-out portion, and the second-row m + 1-th column opposite-polarity take-out portion. As shown in FIG. 8, the electrical connection work on the first and second rows is performed on the work area 6 on the support 61.
Perform at 2.

After the electrical connection work between the solar cell modules provided in the first and second rows is completed, the work area 6 in FIG.
10 solar cell modules in the 3rd row are installed in 2 and the 1-polarity take-out portion of the solar cell module existing in the 2nd row m-th column is the opposite polarity take-out section in the 2nd row m + 1th column,
An electrical connection is made at one place with the one-polarity takeout portion at the third row and mth column and the opposite polarity takeout portion at the third row and m + 1th column (see FIG. 9).

Then, similarly, the process of installing one row of solar cell modules in the area on the support, which was the work area in the previous step, and electrically connecting the solar cell modules to each other is repeated, and the last row is repeated. The electrical connection is made up to the solar cell module in the sixth row. When the installation work and the electrical connection work in the sixth row are completed, the electric wire attached to the bypass diode 63 is electrically connected between the unconnected positive electrode and negative electrode lead-out portions of each solar cell module provided in the first row. (See Figure 10).

The above-mentioned electrical connection between the lead-out electrodes and the above-mentioned electrical connection between the lead-out electrode and the electric wire attached to the bypass diode are all performed by using a ring sleeve.

In this example, first, the solar cell modules are installed for two rows from the north end, electrical connection work between the solar cell modules is performed, and then one row of solar cell modules is installed in the working space used immediately before. Then, the step of arranging the solar cell module on the support and the step of electrically connecting the extraction electrodes of the solar cell module are alternately performed, such as performing an electrical connection work between the solar cell modules. As a result, the work can be sequentially completed line by line from the north to the south, and the work can be performed in the solar cell module installation planned area on the support, so that the work can be performed on the solar cell module array after construction. There is no space left, and power generation efficiency per area can be improved.

[0103]

As described above, according to the solar cell module array of the present invention, it is possible to connect the solar cell modules in series / parallel without using the conventionally required parallel connection member. This eliminates the problem of parallel connection members contacting the solar cell modules and reducing reliability during the series-parallel connection work between the solar cell modules, and work carefully so that the parallel connection members do not contact the solar cell modules. Therefore, it is possible to improve workability.

Further, since the parallel connection member is unnecessary,
It is not necessary to electrically connect the output terminals of each solar cell module to the branch lines provided in the parallel connection member, and as a result,
Since the number of locations for electrical connection is reduced, it is possible to reduce the amount of material required for electrical connection work, such as the ring sleeve, and it is possible to significantly reduce the work time.

[Brief description of drawings]

FIG. 1 is an electric circuit diagram of a general solar cell module array.

FIG. 2 is a plan view of the solar cell module according to the embodiment of the present invention as seen from the light receiving surface side.

FIG. 3 is an electric circuit diagram of a solar cell module array according to an exemplary embodiment of the present invention.

FIG. 4 is a diagram for explaining a solar cell module array according to the first embodiment of the present invention.

FIG. 5 is an electric circuit diagram of the solar cell module array according to the first embodiment of the present invention.

FIG. 6 is a view for explaining the solar cell module according to the first embodiment of the present invention.

FIG. 7 is a diagram for explaining a photovoltaic element according to the first embodiment of the present invention.

FIG. 8 is a drawing for explaining the manufacturing method for the solar cell module array according to the third embodiment of the present invention.

FIG. 9 is a drawing for explaining the manufacturing method for the solar cell module array according to the third embodiment of the present invention.

FIG. 10 is a drawing for explaining the manufacturing method for the solar cell module array according to the third embodiment of the present invention.

[Explanation of symbols]

10, 20, 40, 60 Solar cell module 11 Parallel connection members 12 Conductive member 13 branch lines 14, 16, 32, 48 Ring sleeve 15, 22, 44 output terminals 17, 26, 34, 63 Bypass diode 21, 41, 50 Photovoltaic device 23,45 coating material 24,46 Extraction electrode 25 Take-out section 31, 61 support 42, 43, 56, 57 electrodes 47 Solder 51 resin layer 52 Transparent electrode layer 53 Photoelectric conversion layer 54 Backside reflective layer 55 Backside electrode layer 62 workspace

   ─────────────────────────────────────────────────── ─── Continued front page    (72) Inventor Seiki Itoyama             3-30-2 Shimomaruko, Ota-ku, Tokyo             Non non corporation (72) Inventor Hidehisa Makita             3-30-2 Shimomaruko, Ota-ku, Tokyo             Non non corporation (72) Inventor Masaaki Matsushita             3-30-2 Shimomaruko, Ota-ku, Tokyo             Non non corporation F-term (reference) 5F051 AA05 BA03 BA11 DA04 EA03                       EA17 FA04 GA02 JA03 JA04                       JA05 JA07 JA08 JA09

Claims (14)

[Claims] 1. A solar cell module having two positive electrode terminals and two negative electrode output terminals, and electrically connecting output terminals having the same polarity to each other by extraction electrodes, each extraction electrode having two extraction portions. And the solar cell module is arranged on a support in N rows in the vertical direction and M columns in the horizontal direction with the output terminals of the positive electrode and the negative electrode aligned in the same direction.
The n-th row and m-th column (1≤n≤N-1, 1≤m≤M-
1) the take-out portion of the solar cell module having one polarity is the take-out portion having the opposite polarity at the nth row and the m + 1th column, the takeout portion having the one polarity at the n + 1th row and the mth column, n + 1
A solar cell module array, wherein the solar cell module array is electrically connected to the take-out portion having the opposite polarity in the row m + 1 column at one place. 2. The solar cell module has a photovoltaic element group composed of at least one photovoltaic element to which the output terminal is connected, and the photovoltaic element group has a tip portion of each output terminal. The solar cell module array according to claim 1, wherein the solar cell module array is sealed with a covering material. 3. The photovoltaic element has at least a transparent electrode layer, a photoelectric conversion layer, and a back electrode layer, and two output terminals having the same polarity are electrically connected via the transparent electrode layer or the back electrode layer. The solar cell module array according to claim 2, which is electrically connected to the solar cell module array. 4. The coating material extends at least 10 mm from the end of the photovoltaic element group, and the extraction electrode is arranged on the light-receiving surface side of the protruding coating material. Item 2. The solar cell module array according to Item 2 or 3. 5. The solar cell module array according to claim 2, wherein the extraction electrode is separated from the end of the photovoltaic element group by at least 5 mm. 6. The extraction electrode is erected upward with respect to the installation surface of the solar cell module, and the extraction electrodes are electrically connected to each other at the rising portion. 2. The solar cell module array according to item 1. 7. The solar cell module array according to claim 1, wherein the output terminal and the extraction electrode have flexibility. 8. The solar cell module array according to claim 1, wherein the extraction electrode is formed by bending a single conductive member into a U-shape. 9. The solar cell module array according to claim 1, wherein the extraction electrode is made of a conductive member that is not covered. 10. A method for manufacturing the solar cell module array according to claim 1, wherein the step of forming a support body on which the solar cell module is installed is provided in the solar cell module. Solar cell module array, including the steps of activating the extracted electrodes and arranging the solar cell module on a support, electrically connecting the extraction electrodes of the solar cell module to each other, and providing a bypass diode. Manufacturing method. 11. The step of activating the extraction electrode provided on the solar cell module to arrange the solar cell module on a support and the step of electrically connecting the extraction electrodes of the solar cell module are alternately performed. The method for manufacturing a solar cell module array according to claim 10, wherein. 12. The method of manufacturing a solar cell module array according to claim 10, wherein a ring sleeve is used in the step of electrically connecting the extraction electrodes of the solar cell module. 13. A photovoltaic element group comprising at least one photovoltaic element, wherein each photovoltaic element group is provided with two positive and negative output terminals. The electromotive force element group is sealed by a covering material except for the tip of each output terminal, and the exposed portions of two output terminals having the same polarity are electrically connected to a take-out electrode composed of one conductive member. The solar cell module is characterized in that the extraction electrode is disposed on the light-receiving surface side of the coating material. 14. A step of forming a photovoltaic element group having at least one photovoltaic element, a step of providing two output terminals for each of a positive electrode and a negative electrode of the photovoltaic element group, and an output terminal. Step of sealing the photovoltaic device group with a covering material excluding the tip of each output terminal, and after taking out the photovoltaic device group, take it out to the exposed part of two output terminals having the same polarity. A method of manufacturing a solar cell module, comprising a step of electrically connecting electrodes.