JP2009266958A - Solar battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar battery module which has both strength and reliability while reduced in weight and is capable of being manufactured inexpensively. <P>SOLUTION: The solar battery module includes a hard substrate, wiring formed on the hard substrate, a back surface electrode type solar battery cell electrically connected on the wiring, and a sealer installed on the back surface electrode type solar battery cell. In this case, it is preferable that a light receiving surface protective layer is provided on the sealer and the light receiving surface protective layer is formed of a transparent resin. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a solar cell module, and more particularly to a solar cell module that has both strength and reliability while being reduced in weight and can be manufactured at low cost.

In recent years, development of clean energy has been demanded due to problems of depletion of energy resources and global environmental problems such as an increase in CO _{2 in} the atmosphere. In particular, solar power generation using solar cells is a new energy source. It has been developed, put into practical use, and is on the path of development.

  In a conventional solar cell, for example, light is received by diffusing an impurity having a conductivity type opposite to that of the silicon substrate on the surface (light receiving surface) on the side on which sunlight is incident of a monocrystalline or polycrystalline silicon substrate. A mainstream product is one in which a pn junction is formed near the surface, one electrode is disposed on the light receiving surface, and the other electrode is disposed on the front surface (back surface) on the opposite side of the light receiving surface.

  Then, a solar cell structure is formed by electrically connecting a plurality of solar cells having the above-described configuration with an interconnector, and a sealing material such as a resin is formed after electrically connecting the plurality of solar cell structures. A solar cell module is produced by sealing with solar power generation.

  In FIG. 9, typical sectional drawing of an example of the conventional solar cell module is shown. Here, in the conventional solar cell module, a light receiving surface side electrode (not shown) is formed together with the antireflection film 603 on the light receiving surface on which the texture structure of the silicon substrate 601 is formed, and a back surface side electrode 602 is formed on the back surface. The solar battery structure in which the solar battery cells connected by the interconnector 609 is sealed in a sealing material 606 such as a transparent resin.

  And the glass substrate 605 is installed in the surface of the light-receiving surface side of the sealing material 606 which sealed the solar cell structure body, and the flexible weatherproof film 607 is installed in the surface of the back surface side. The outer periphery is surrounded by an aluminum frame 608.

Further, the interconnector 609 at both ends of the solar cell structure is provided with a conducting wire 604 connected to another solar cell structure.
JP-A-6-61518 JP 2006-86390 A JP 2001-358351 A JP 2005-340362 A JP-A-1-176957 Kyotaro Nakamura et al, “DEVELOPMENT OF 20% EFFICIENCY MASS PRODUCTION SI SOLAR CELLS, 20th EUPVSEC, 6-10 Jun 2005, Barcelona, Spain”

  However, in the conventional solar cell module, a glass substrate (thickness: about 3.3 mm) is provided on the light receiving surface side of the solar cell module from the viewpoint of maintaining the strength of the solar cell module and the light transmittance of sunlight. Therefore, there is a problem that it is difficult to manufacture the solar cell module at low cost because the weight of the solar cell module is increased, the glass substrate is easily broken, and the glass substrate has a high cost ratio to the solar cell module. It was.

  In view of the above circumstances, an object of the present invention is to provide a solar cell module that has both strength and reliability while being reduced in weight and can be manufactured at low cost.

  The present invention includes a hard substrate, a wiring formed on the hard substrate, a back electrode solar cell electrically connected to the wiring, and a sealing material installed on the back electrode solar cell. It is a solar cell module provided with.

  Here, in the solar cell module of the present invention, the hard substrate is preferably a glass epoxy substrate or a paper epoxy substrate.

  In the solar cell module of the present invention, the thickness of the hard substrate is preferably 3 mm or more and 4 mm or less.

  In the solar cell module of the present invention, a through hole that penetrates the hard substrate in the thickness direction, a connecting conductor that covers the inner peripheral surface of the through hole, and a wiring of the hard substrate are formed in a part of the hard substrate. A conductor for current extraction formed on the surface opposite to the current-carrying side, and the wiring and the conductor for current extraction may be electrically connected by the conductor for connection.

  Moreover, in the solar cell module of this invention, it is preferable to provide a light-receiving surface protective layer on a sealing material, and the light-receiving surface protective layer is formed from transparent resin.

  In the solar cell module of the present invention, the transparent resin is preferably at least one of an acrylic resin and a polycarbonate resin.

  In the solar cell module of the present invention, it is preferable that the surface on the side opposite to the side where the wiring of the hard substrate is formed is exposed to the outside.

  ADVANTAGE OF THE INVENTION According to this invention, while aiming at weight reduction, it can provide the solar cell module which has intensity | strength and reliability, and can be manufactured at low cost.

  Hereinafter, embodiments of the present invention will be described. In the drawings of the present invention, the same reference numerals represent the same or corresponding parts. Further, in the present specification, the surface disposed on the side on which sunlight is mainly incident is referred to as a light receiving surface, and the surface opposite to the light receiving surface is described as a back surface.

  In FIG. 1, typical sectional drawing of an example of the solar cell module of this invention is shown. Here, in the solar cell module of the present invention, for example, a passivation film 103 is formed on the back surface of a p-type or n-type silicon substrate 101, and an n-type region is formed on the back surface of the silicon substrate 101 exposed from the passivation film 103. A plurality of back electrode type solar cells 100 in which 104 and p-type region 105 are respectively formed are provided.

  An n-type electrode 106 is formed on the n-type region 104 on the back surface of the silicon substrate 101 of the back-electrode solar cell 100, and a p-type electrode 107 is formed on the p-type region 105. Both the n-type electrode 106 and the p-type electrode 107 are formed on the back surface of the back electrode type solar battery cell 100. In this example, a texture structure is formed on the light receiving surface of the silicon substrate 101, and an antireflection film 102 is formed on the light receiving surface of the silicon substrate 101 on which the texture structure is formed.

  In addition, an insulating hard substrate 111 is installed on the back surface side of the back electrode type solar cell 100, and n-type wiring 109 and p are formed on the surface of the hard substrate 111 on the back electrode type solar cell 100 side. A mold wiring 110 is provided.

  The n-type wiring 109 installed on the hard substrate 111 is electrically connected to the n-type electrode 106 of the back electrode type solar cell 100, and the p-type wiring 109 installed on the hard substrate 111 is used. A p-type electrode 107 of the back electrode type solar battery cell 100 is electrically connected to the wiring 110.

  In addition, the n-type electrode 106 of one back electrode type solar cell 100 and the p-type electrode 107 of the other back electrode type solar cell 100 among the plurality of adjacent back electrode type solar cells 100 are electrically connected. By being connected to each other, adjacent back electrode type solar cells 100 are connected in series to form a solar cell structure.

  In addition, a sealing material 113 is installed on the light receiving surface side of the solar cell structure so as to seal the back electrode type solar cell 100, and the light receiving surface protection layer 112 is provided on the sealing material 113. Is installed. Further, a frame body 114 is fitted on the outer periphery of the hard substrate 111, the light receiving surface protective layer 112 and the sealing material 113.

  Here, as the hard substrate 111, a glass epoxy substrate or a paper epoxy substrate is preferably used. Conventionally known glass epoxy substrates or paper epoxy substrates can be used.

  The thickness D of the hard substrate 111 is preferably 3 mm or greater and 4 mm or less. When the thickness D of the hard substrate 111 is 3 mm or more and 4 mm or less, the solar cell module of the present invention can be reduced in weight, and the strength equivalent to that of the conventional solar cell module can be secured. It is in.

  Further, as the light receiving surface protective layer 112, it is preferable to use a transparent resin such as an acrylic resin and / or a polycarbonate resin. As the acrylic resin or the polycarbonate resin, for example, conventionally known ones can be used. Further, when an acrylic resin and / or a polycarbonate resin is used as the light-receiving surface protective layer 112, the acrylic resin and the polycarbonate resin may be used alone, or an acrylic resin and a polycarbonate resin may be mixed and used.

  Further, as the sealing material 113, it is preferable to use an insulating transparent resin such as EVA (ethylene vinyl acetate). For example, a conventionally known EVA can be used.

  In the solar cell module of the present invention having the above-described configuration, a light-weight light-receiving surface protective layer made of a transparent resin such as an acrylic resin or a polycarbonate resin is used while using a hard substrate 111 made of, for example, a glass epoxy substrate or a paper epoxy substrate. Since 112 is used, it is possible to reduce the weight of the solar cell module.

  In addition, since the light-receiving surface protective layer 112 made of a transparent resin such as an acrylic resin or a polycarbonate resin has a light transmittance comparable to that of a conventional glass substrate, the photoelectric conversion characteristics of the solar cell module are also comparable to those of the conventional one. be able to.

  Furthermore, by using a hard substrate 111 having a higher rigidity than that of a flexible weather-resistant film, even when the light-receiving surface protective layer 112 is used instead of a glass substrate, the strength of the solar cell module is ensured and reliability is improved. Since it is not necessary to use an expensive glass substrate, a solar cell module can be manufactured at a lower manufacturing cost.

  The solar cell module of the present invention having the above-described configuration can be manufactured, for example, as follows. First, for example, as shown in the schematic plan view of FIG. 2, a back electrode type solar cell 100 having a comb-shaped p-type electrode 107 and a comb-shaped n-type electrode 106 on the back surface of a silicon substrate 101 is provided. prepare.

  Next, for example, a hard substrate 111 having a configuration as shown in the schematic plan view of FIG. 3 is prepared. Here, the p-type wiring 110 on the hard substrate 111 is formed according to the shape of the p-type electrode 107 of the back electrode type solar cell 100, and the n-type electrode 109 on the hard substrate 111 is formed on the back surface. It is formed in accordance with the shape of the n-type electrode 107 of the electrode type solar battery cell 100. Further, the p-type wiring 110 and the n-type wiring 109 on the hard substrate 111 are electrically connected by a connection wiring 118, whereby the adjacent back electrode type solar cells 100 are electrically connected in series. Allows to be connected to.

  Then, the p-type electrode 107 of the back electrode type solar cell 100 having the configuration shown in FIG. 2 is installed and connected on the p-type wiring 110 of the hard substrate 111, and the n-type electrode 106 is connected to the n of the hard substrate 111. Install and connect on the mold wiring 109. Thereby, for example, a solar cell structure having the configuration shown in the schematic plan view of FIG. 4 is formed. In addition, the top view when a solar cell structure is seen from the light-receiving surface side is typically shown by FIG. The solar battery structure shown in FIG. 4 has a configuration in which the back electrode type solar cells 100 are electrically connected in series with 24 back electrode type solar cells 100 in 6 rows and 4 rows. .

  FIG. 5 is a schematic cross-sectional view showing an example of a method of installing the back electrode type solar battery cell 100 on the hard substrate 111 in the solar battery structure shown in FIG. Here, the n-type electrode 106 of the back electrode solar cell 100 is installed on the n-type wiring 109 of the hard substrate 111, and the p-type electrode 107 of the back electrode solar cell 100 is the hard substrate 111. It is the structure installed on the electrode 110 for p-type.

  Thereafter, in the solar cell structure having the above-described configuration, the sealing material 113 is installed so as to seal the back electrode type solar cell 100 on the hard substrate 111, and the sealing material 113 is placed on the sealing material 113 as described above. The light-receiving surface protective layer 112 is installed to complete the solar cell module of the present invention.

  In FIG. 6, the typical expanded sectional view of an example of the solar cell structure used for the solar cell module of this invention is shown. The solar cell structure shown in FIG. 6 is characterized in that a through hole 111a is formed in a hard substrate 111, and a connecting conductor 173 is formed so as to cover the inner peripheral surface of the through hole 111a. is there.

  Here, the through hole 111a is formed in a part of the hard substrate 111 so as to penetrate the hard substrate 111 in the thickness direction. A part of the surface of the p-type wiring 110 on the hard substrate 111 is exposed from the through hole 111a.

  FIG. 7 shows a schematic cross-sectional view of an example of the solar cell module of the present invention using the solar cell structure having the configuration shown in FIG. Here, in the solar cell module of the present invention shown in FIG. 7, the connecting conductor 173 is formed so as to cover the inner peripheral surface of the through hole 111 a, and p-type current extraction is performed on the back surface of the hard substrate 111. Conductor 171 and n-type current extracting conductor 172 are formed. The n-type wiring 109 of the hard substrate 111 and the n-type current extraction conductor 172 are electrically connected to each other by the connecting conductor 173 inside the through hole 111a. The wiring 107 and the p-type current extracting conductor 171 are electrically connected. In addition, a terminal box 170 is installed on the back surface of the hard substrate 111, and a p-type current extracting conductor 171 is electrically connected to a positive output terminal of the terminal box 170, and is connected to a negative output terminal. An n-type current extracting conductor 172 is electrically connected.

  In the solar cell module of the present invention having such a configuration, the current generated in the back electrode type solar cell 100 by the incidence of sunlight passes through the connecting conductor 173 and takes out the p-type current on the back surface of the hard substrate 111. Can be taken out of the solar cell module from the electric conductor 171 and the n-type electric current extracting conductor 172.

  FIG. 8 shows a schematic cross-sectional view of another example of the solar cell module of the present invention. Here, the terminal box 170 is characterized in that it is attached to the frame body 114 instead of the back surface of the hard substrate 111. Here, the p-type current extraction conductor 171 and the n-type current extraction conductor 172 are each installed so as to penetrate the frame body 114.

  In the solar cell module of the present invention configured as described above, the light-receiving surface protective layer 112 made of a transparent resin such as an acrylic resin or a polycarbonate resin is used for the light-receiving surface of the solar cell module, and a hard substrate is used for the back surface of the solar cell module. By using 111, it is considered that the following advantages are obtained, for example.

  1) In the structure of the conventional solar cell module, the strength of the solar cell module is maintained by the glass substrate on the light receiving surface side. However, in the solar cell module of the present invention, for example, a glass epoxy substrate or a paper epoxy substrate is used. By using a hard substrate, it is not necessary to maintain the strength of the solar cell module with the glass substrate. As described above, in the solar cell module of the present invention, the weight of the entire solar cell module, which is a disadvantage of using the glass substrate, is easy to break the glass substrate itself, and the manufacturing cost of the solar cell module is reduced. be able to. In order to maintain the same level of strength as that of the current solar cell module, the thickness of the hard substrate is preferably 3 mm or more and 4 mm or less. Further, since the hard substrate itself has strength and is in close contact with the back electrode type solar battery cell, it tends to prevent cracking of the back electrode type solar battery cell. Furthermore, even when a glass substrate is used in place of the light-receiving surface protective layer, due to the convenience of manufacturing the solar cell module, the solar cell module of the present invention has sufficient strength of the solar cell module with a hard substrate. Therefore, the glass substrate can be thinned, so that the solar cell module can be reduced in weight, the light transmittance can be improved, and the manufacturing cost can be reduced.

  2) In the solar cell module of the present invention, the back surface of the hard substrate (the surface opposite to the side on which the wiring of the hard substrate is formed) is exposed to the outside. For example, a glass epoxy substrate or a paper epoxy substrate is used. As described above, when a hard substrate having moisture resistance is used, a flexible weather-resistant film becomes unnecessary, and thus the manufacturing cost of the solar cell module can be reduced.

  3) In the solar cell module of the present invention, when a hard substrate having excellent workability such as a glass epoxy substrate or a paper epoxy substrate is used, a through hole is provided at an arbitrary position of the hard substrate, and the through hole is provided. It is also possible to use as a hole for drawing out a conducting wire for taking out current to the outside.

  4) In the solar cell module of the present invention, instead of using a glass substrate, a light-receiving surface protective layer made of a transparent resin such as an acrylic resin or a polycarbonate resin is used, thereby reducing the weight of the solar cell module and the solar cell module. (In order to maintain the same light transmittance as the current glass substrate, when acrylic resin is used as the light-receiving surface protective layer, the thickness is about 1.3 mm.) When resin is used, the thickness is about 0.7 mm, and both materials have sufficient strength at these thicknesses). Further, by changing the thickness of the light receiving surface protective layer, it is possible to easily adjust the light transmittance and strength.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  ADVANTAGE OF THE INVENTION According to this invention, while aiming at weight reduction, it can provide the solar cell module which has intensity | strength and reliability, and can be manufactured at low cost.

It is typical sectional drawing of an example of the solar cell module of this invention. It is a typical top view of an example of a back electrode type solar cell used for a solar cell module of the present invention. It is a typical top view of an example of the hard substrate used for the solar cell module of the present invention. It is a typical top view when an example of the solar cell structure used for the solar cell module of this invention is seen from the light-receiving surface side. It is typical sectional drawing which shows an example of the method of installing a back-electrode-type solar cell on the rigid board | substrate of the solar cell structure shown in FIG. It is a typical expanded sectional view of an example of the solar cell structure used for the solar cell module of this invention. It is typical sectional drawing of an example of the solar cell module of this invention using the solar cell structure of the structure shown in FIG. It is typical sectional drawing of another example of the solar cell module of this invention. It is typical sectional drawing of an example of the conventional solar cell module.

Explanation of symbols

  100 back electrode type solar cell, 101,601 silicon substrate, 102,603 antireflection film, 103 passivation film, 104 n-type region, 105 p-type region, 106 n-type electrode, 107 p-type electrode, 109 n-type Wiring, 110 p-type wiring, 111 hard substrate, 111a through hole, 112 light-receiving surface protective layer, 113,606 sealing material, 114,608 frame, 118 connection wiring, 170 terminal box, 171 p-type current Conductor for taking out, 172 Conductor for taking out current for n-type, 173 Conducting conductor, 602 Back side electrode, 604 Conductor, 605 Glass substrate, 607 Weather-resistant film, 609 Interconnector.

Claims (7)

A hard substrate;
Wiring formed on the hard substrate;
A back electrode type solar cell electrically connected on the wiring;
The solar cell module provided with the sealing material installed on the said back surface electrode type photovoltaic cell.   The solar cell module according to claim 1, wherein the hard substrate is a glass epoxy substrate or a paper epoxy substrate.   The solar cell module according to claim 1 or 2, wherein a thickness of the hard substrate is 3 mm or more and 4 mm or less. A through hole penetrating the hard substrate in a thickness direction in a part of the hard substrate;
A connecting conductor covering the inner peripheral surface of the through hole;
A current extracting conductor formed on the surface of the hard substrate opposite to the side on which the wiring is formed;
The solar cell module according to any one of claims 1 to 3, wherein the wiring and the current extracting conductor are electrically connected by the connecting conductor. A light-receiving surface protective layer is provided on the sealing material,
The solar cell module according to any one of claims 1 to 4, wherein the light-receiving surface protective layer is made of a transparent resin.   The solar cell module according to claim 5, wherein the transparent resin is at least one of an acrylic resin and a polycarbonate resin.   The solar cell module according to any one of claims 1 to 6, wherein a surface of the hard substrate opposite to the side on which the wiring is formed is exposed to the outside.

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