JP2013084659A - Solar cell module and photovoltaic power generation system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a solar cell module capable of suppressing a reduction in output.SOLUTION: A solar cell module 1 comprises: a solar cell panel 30; and a frame member 7 for holding the edge of the solar cell panel 30. The solar cell panel 30 comprises: a solar cell 2; a translucent substrate 5; and a sealing material 4 disposed between the solar cell 2 and the translucent substrate 5. The frame member 7 includes an upper surface holding part 7a positioned above an upper surface 5a of the translucent substrate 5. That surface of the frame member 7 which faces a space surrounded by the upper surface 5a of the translucent substrate 5 and the upper surface holding part 7a is covered with an insulating layer 9.

Description

  The present invention relates to a solar cell module and a solar power generation system, and more particularly to a solar cell module and a solar power generation system including a holding member that holds an edge of a solar cell panel.

  In recent years, solar cell modules including so-called back electrode type solar cells in which an n electrode and a p electrode are formed on the back surface side of a silicon substrate have been developed. For example, a solar cell module 1001 according to a conventional example connects a plurality of back electrode type solar cells 1010 (hereinafter simply referred to as solar cells 1010) and adjacent solar cells 1010 as shown in FIG. Connection member 1020, sealing material 1021 covering solar battery cell 1010 and connection member 1020, translucent substrate 1022 and back surface protection sheet 1023 sandwiching solar battery cell 1010, connection member 1020 and sealing material 1021 in the vertical direction And a frame member 1024 (holding member) that holds the edge of the solar cell panel. As shown in FIG. 17, a solar cell 1010 includes an n-type silicon substrate 1011 having an n-type current collecting layer 1011a and a p-type current collecting layer 1011b provided on the back surface side, and an upper surface (light receiving surface) side of the silicon substrate 1011. A passivation film 1012 provided on the back surface of the silicon substrate 1011 and an n-electrode 1013 provided on the back side of the silicon substrate 1011 and electrically connected to the n-type current collecting layer 1011a and a p-type electrically connected to the p-type current collecting layer 1011b. An electrode 1014. In FIG. 16, the n-electrode 1013 and the p-electrode 1014 are omitted.

  When the solar cell module 1001 is irradiated with sunlight, electron-hole pairs are generated in the silicon substrate 1011, and the electrons and holes are attracted to the n-type current collection layer 1011 a and the p-type current collection layer 1011 b, respectively. Thereby, a predetermined output (electric power) is taken out. In this solar cell 1010, since no electrode is formed on the light receiving surface side of the silicon substrate 1011, there is no shadow loss due to the electrode (loss of light due to the shadow of the electrode).

  In addition, the solar cell module which connected the some back surface electrode type photovoltaic cell is disclosed by patent document 1, for example.

JP 2010-16074 A

  However, the inventors of the present application have a problem that when the solar cell module 1001 is irradiated with sunlight to generate power, the output of the solar cell module 1001 may decrease (power generation efficiency may decrease). I found. Specifically, as a result of various studies on the solar cell module 1001, the inventor of the present application has found that the output of the solar cell module in which electrodes are provided on the light receiving surface and the back surface that are conventionally used is unlikely to decrease. As the potential difference between the potential of the power generation circuit in the solar cell module 1001 and the potential of the frame member 1024 is larger, the output is more likely to decrease, and a water film is formed on the light receiving surface of the solar cell module 1001 due to rain or the like. We found out that the output is likely to decrease when the

  From these results, the inventors of the present application estimated that the output of the solar cell module 1001 was reduced by the following mechanism.

  First, when the potential of the solar battery cell 1010 is higher than the surrounding potential (outside of the frame member 1024 or the solar battery module 1001), the light receiving surface side of the solar battery cell 1010 is shown in FIG. A directional electric field E is generated. Then, electrons contained in the light-transmitting substrate 1022 and the sealing material 1021 are collected on the passivation film 1012 side by the electric field E.

  Second, holes should be collected in the direction of the light receiving surface of the silicon substrate 1011, that is, the side where the passivation film 1012 is formed, so as to form a pair with the electrons collected on the light receiving surface of the passivation film 1012. Force is generated.

  Thirdly, when the pn junction of the solar battery cell 1010 is irradiated with light, an electron / hole pair is generated. Then, due to the force to collect the holes, the probability that the generated holes are directed toward the passivation film 1012 is increased, and the generated holes are generated in the p-type current collecting layer 1011b provided on the back surface of the silicon substrate 1011. The rate of arrival decreases. When the silicon substrate 1011 is n-type, holes become minority carriers, so that the rate at which the generated holes reach the p-type current collecting layer 1011b decreases that the output current of the solar battery cell 1010 decreases. It is. That is, the output of the solar cell module 1001 decreases (power generation efficiency decreases).

  In general, when the frame member 1024 is formed of a conductive member such as metal, the frame member 1024 is often grounded to ensure safety against electric shock. On the other hand, the potential of the solar battery cell 1010 may be higher than the ground potential by generating power. Therefore, the potential of the power generation circuit (a plurality of solar cells 1010 and connection members 1020 and the like) inside the solar cell module 1001 may be higher than the potential of the frame member 1024, and the electric field generated by this potential difference causes the above-mentioned It is estimated that a decrease in output (decrease in power generation efficiency) occurs due to the mechanism.

  The force to collect the holes is proportional to the electric field strength applied to the light receiving surface side of the silicon substrate 1011 of the solar battery cell 1010. For this reason, the electric field strength decreases as the distance between the power generation circuit inside the solar cell module 1001 and the frame member 1024 increases. Usually, the frame member 1024 is attached to the edge of the solar cell module 1001, and the distance between the portions that generate the potential difference (the distance between the frame member 1024 and the solar cell 1010) is separated. For this reason, it is possible to suppress an increase in electric field strength, and it is possible to suppress a decrease in output.

  However, as shown in FIG. 19, when water (rainwater) 1050 accumulates on the surface of the solar cell module 1001 due to rain or the like, the potential of the upper surface of the light-transmitting substrate 1022 may become the ground potential. Specifically, when the water 1050 accumulates on the upper surface of the light-transmitting substrate 1022 and contacts the frame member 1024, the upper surface of the light-transmitting substrate 1022 and the frame member 1024 are electrically connected by the water 1050 and have the same potential. become. When the frame member 1024 is grounded, the upper surface of the light-transmitting substrate 1022 has a ground potential, and the distance between the portions that generate the potential difference (the distance between the upper surface of the light-transmitting substrate 1022 and the solar battery cell 1010). Is drastically closer than in the case where water does not accumulate on the surface of the solar cell module 1001. For this reason, the intensity | strength of the electric field concerning the light-receiving surface of the photovoltaic cell 1010 increases remarkably, and there exists a possibility that an output may fall.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a solar cell module and a photovoltaic power generation system capable of suppressing a decrease in output. It is.

  In order to achieve the above object, a solar cell module of the present invention includes a solar cell panel and a conductive holding member that holds an edge of the solar cell panel, and the solar cell panel includes solar cells, A translucent substrate disposed on the light receiving surface side of the solar cell, and a sealing material disposed between the solar cell and the translucent substrate, the solar cell comprising an n-type silicon substrate, An insulating passivation film provided on the light-receiving surface of the silicon substrate, and an n electrode and a p-electrode provided on the back surface of the silicon substrate, and the holding member is an upper surface of the light-transmitting substrate serving as the light-receiving surface of the solar cell panel In addition, the surface of the holding member that includes the upper surface holding portion located above and faces the space surrounded by the upper surface and the upper surface holding portion of the translucent substrate is covered with an insulating layer.

  In the present specification and claims, a light-transmitting substrate refers to a substrate that is transparent to sunlight (having light-transmitting properties).

  In the solar cell module of the present invention, as described above, the surface of the holding member facing the space surrounded by the upper surface of the translucent substrate and the upper surface holding portion is covered with the insulating layer. That is, an insulating layer is provided between the upper surface of the translucent substrate and the holding member. Thereby, even when water accumulates on the surface of the solar cell module due to rain or the like, it is possible to prevent the upper surface of the translucent substrate and the holding member from being electrically connected to have the same potential. For this reason, it can suppress that the distance between the parts which produce a potential difference becomes near. Specifically, it is possible to prevent a potential difference applied between the holding member and the solar battery cell from being applied between the upper surface of the translucent substrate and the solar battery cell due to accumulation of water. Thereby, even if it is a case where water accumulates on the surface of a solar cell module by rain etc., it can control that the intensity of the electric field concerning the light-receiving surface of a photovoltaic cell becomes high. Usually, the electric potential of the solar cell is often higher than the electric potential of the surroundings (outside of the holding member or the solar cell module), that is, the electric field in the direction from the silicon substrate to the passivation film is present on the light receiving surface of the solar cell. Often it takes. When an n-type silicon substrate is used for a so-called back electrode type solar cell in which an n electrode and a p electrode are provided on the back surface, if an electric field in the above direction is applied, the output of the solar cell module is likely to decrease. . Therefore, in a solar cell module using a so-called back electrode type solar cell having an insulating passivation film on the light receiving surface and using an n-type silicon substrate, the output decreases (power generation efficiency decreases). Can be remarkably suppressed.

  In the solar cell module, preferably, the entire surface of the upper surface holding portion is covered with an insulating layer. If comprised in this way, all the holding members of the part above the upper surface of a translucent board | substrate will be covered with an insulating layer. For this reason, even if it is a case where water overflows from the upper surface holding part, it can suppress more that the upper surface of a translucent board | substrate and a holding member are electrically connected.

  In the solar cell module, preferably, the insulating layer is formed of an insulating sheet. If comprised in this way, an insulating layer can be easily formed so that the surface of an upper surface holding | maintenance part may be covered.

  In the solar cell module, preferably, the insulating layer is formed of an insulating paint. If comprised in this way, an insulating layer can be easily formed so that the surface of an upper surface holding | maintenance part may be covered.

  In the solar cell module, preferably, at least the surface of the upper surface holding portion of the holding member is made of metal, and the insulating layer is a layer obtained by chemically reacting metal. If comprised in this way, an insulating layer can be easily formed so that the surface of an upper surface holding | maintenance part may be covered.

  In the solar cell module, preferably, the solar cell panel includes an insulating back surface protection sheet disposed on the back surface side of the solar cell, and the insulating layer includes a back surface protection sheet extended from the back surface of the solar cell panel. . If comprised in this way, the surface of an upper surface holding | maintenance part can be reliably covered with a back surface protection sheet.

  The solar cell module preferably includes an insulating end surface sealing member disposed between the end surface of the solar cell panel and the holding member, and the insulating layer extends from between the end surface of the solar cell panel and the holding member. The extended end face sealing member is included. If comprised in this way, the surface of an upper surface holding | maintenance part can be reliably covered with an end surface sealing member.

  In the solar cell module, preferably, the insulating layer extends upward from the upper surface holding portion. If comprised in this way, since the water on the upper surface of a translucent board | substrate and the water on a holding member can be parted by the protruding part of an insulating layer, the upper surface of a translucent board | substrate and a holding member Can be further suppressed from being electrically connected.

  In the solar cell module, preferably, a water repellent layer is provided on the surface of the insulating layer. If comprised in this way, since the water on the upper surface of a translucent board | substrate and the water on a holding member can be effectively parted by a water repellent layer, the upper surface of a translucent board | substrate, a holding member, Can be further suppressed from being electrically connected.

  The photovoltaic power generation system of the present invention includes the solar cell module having the above-described configuration. If comprised in this way, the solar power generation system which can suppress that an output falls will be obtained.

  In the solar power generation system, preferably, the holding member is grounded, and the potential of the output terminal that outputs the generated power of the solar cell module is equal to or higher than the ground potential. In such a case, the output of the solar cell module is likely to decrease. For this reason, it is particularly effective when the potential of the output terminal that outputs the generated power of the solar cell module is equal to or higher than the ground potential that becomes the potential of the holding member.

  The solar power generation system includes a plurality of solar cell modules, the holding members of all the solar cell modules are grounded, and the potential of the output terminal that outputs the generated power of the solar cell module is grounded in at least one solar cell module. It may be higher than the potential. Even with such a configuration, it is possible to suppress a decrease in the output of the solar cell module in which the potential at the output end is equal to or higher than the ground potential.

  In the solar power generation system in which the holding member is grounded, preferably, the solar cell module includes a plurality of solar cells connected in series with each other, and a high-potential side solar cell among the plurality of solar cells. The solar cell module is inclined with respect to the horizontal plane so that is positioned above the solar cell on the low potential side. When the upper surface of the translucent substrate and the holding member are electrically connected, the strength of the electric field applied to the light receiving surface of the high potential solar cell is the strength of the electric field applied to the light receiving surface of the low potential solar cell. Higher than In addition, when the solar cell module is installed to be inclined with respect to the horizontal plane as described above, water tends to accumulate below the solar cell module. That is, the lower part of the upper surface of the light-transmitting substrate and the holding member are easily electrically connected, and the upper part of the upper surface of the light-transmitting substrate and the holding member are not easily electrically connected. For this reason, as described above, by installing the solar cell module at an angle so that the solar cell on the high potential side is positioned in the portion (upper side) that is difficult to be electrically connected to the holding member, It can suppress effectively that output falls.

  As described above, according to the present invention, it is possible to easily obtain a solar cell module and a solar power generation system capable of suppressing a decrease in output.

It is sectional drawing which showed the structure of the solar cell module by 1st Embodiment of this invention. It is sectional drawing which showed the structure of the back electrode type photovoltaic cell of 1st Embodiment of this invention shown in FIG. It is the top view which showed the structure of the solar cell module of 1st Embodiment of this invention shown in FIG. It is the expanded sectional view which showed the structure of the solar cell module shown in FIG. It is the expanded sectional view which showed the structure of the solar cell module shown in FIG. It is the expanded sectional view which showed the state which covered the outer surface of the frame member of the solar cell module shown in FIG. 1 with the insulating layer. It is the expanded sectional view which showed the structure of the solar cell module by 2nd Embodiment of this invention. It is the expanded sectional view which showed the structure of the solar cell module by 3rd Embodiment of this invention. It is the expanded sectional view which showed the structure of the solar cell module by 4th Embodiment of this invention. It is the expanded sectional view which showed the structure of the solar cell module by 5th Embodiment of this invention. It is the expanded sectional view which showed the structure of the solar cell module by 6th Embodiment of this invention. It is the expanded sectional view which showed the state which provided the water-repellent film in the insulating layer of 6th Embodiment of this invention shown in FIG. It is the expanded sectional view which showed the state which covered the water-repellent cap on the insulating layer of 6th Embodiment of this invention shown in FIG. It is sectional drawing which showed the state which inclined the solar cell module by the 1st modification of this invention. It is the top view which showed the structure of the solar cell module by the 2nd modification of this invention. It is sectional drawing which showed the structure of the solar cell module by an example of the past. It is sectional drawing which showed the structure of the back surface electrode type photovoltaic cell by an example of the prior art shown in FIG. FIG. 17 is a cross-sectional view for explaining the movement of electrons and holes due to an electric field generated in the solar cell module according to the conventional example shown in FIG. 16. FIG. 17 is a cross-sectional view illustrating a state where water is accumulated on a light receiving surface of the solar cell module according to the conventional example illustrated in FIG. 16.

  Embodiments of the present invention will be described below with reference to the drawings. In order to facilitate understanding, even a cross-sectional view may not be hatched.

(First embodiment)
With reference to FIGS. 1-6, the structure of the solar cell module 1 by 1st Embodiment of this invention is demonstrated. For simplification of the drawing, the number of solar cells is omitted.

  As shown in FIG. 1, the solar cell module 1 according to the first embodiment of the present invention includes a plurality of back electrode type solar cells 2 (hereinafter simply referred to as solar cells 2) and a plurality of solar cells 2. The connecting member 3 connected in series, the sealing material 4 covering the light receiving surface side and the back surface side of the solar cell 2, the translucent substrate 5 and the back surface protection sandwiching the solar cell 2 and the sealing material 4 in the vertical direction The sheet | seat 6 and the frame member 7 (holding member) holding these (solar cell panel 30) are provided. A solar battery panel 30 is configured by the plurality of solar battery cells 2, the connection member 3, the sealing material 4, the translucent substrate 5, and the back surface protection sheet 6. For simplification of the drawing, only two solar cells 2 are drawn in FIG. 1, but three or more solar cells 2 may be provided.

  As shown in FIG. 2, the solar cell 2 includes an n-type silicon substrate 21, an insulating passivation film 22 made of a silicon nitride film formed on the upper surface (light-receiving surface) of the silicon substrate 21, and a passivation film 22. An insulating antireflection film 23 made of a silicon nitride film formed thereon, and an n electrode 24 and a p electrode 25 provided on the back surface of the silicon substrate 21 are included. In FIG. 1, the n-electrode 24 and the p-electrode 25 are omitted.

  A texture structure (uneven structure) (not shown) is formed on the upper surface of the silicon substrate 21. Further, a passivation film (not shown) may be provided on the back surface of the silicon substrate 21. In this case, an opening for conducting the n-electrode 24 and the p-electrode 25 may be provided in the passivation film on the back surface.

  The silicon substrate 21 is provided on the n-type region 21 a, the back side of the silicon substrate 21, the n-type current collecting layer 21 b having n-type impurities at a higher concentration than the n-type region 21 a, and the back side of the silicon substrate 21. And a p-type current collecting layer 21c having p-type impurities. When solar cells 2 are irradiated with sunlight, electron-hole pairs are generated, electrons are attracted to the n-type current collecting layer 21b, and holes are attracted to the p-type current collecting layer 21c.

  The n-type current collection layer 21b and the p-type current collection layer 21c are in ohmic contact with the n-electrode 24 and the p-electrode 25, respectively. And the n electrode 24 and p electrode 25 of the adjacent photovoltaic cell 2 are electrically connected by the connection member 3 (refer FIG. 1), and the several photovoltaic cell 2 is connected in series. As shown in FIG. 1, the connecting member 3 is arranged at the output end 3a connected to the n electrode 24 of the solar battery cell 2 arranged at one end (low potential side) and at the other end (high potential side). And an output end 3 b connected to the p-electrode 25 of the solar battery cell 2. The output ends 3a and 3b are provided to output the generated power of the solar cell module 1 (a plurality of solar cells 2).

  It is preferable that the passivation film 22 has a higher refractive index than the antireflection film 23. The passivation film 22 may be formed of a silicon compound film such as a silicon oxide film or a silicon carbide film instead of the silicon nitride film. The passivation film 22 may be formed of a dielectric film having a passivation effect that suppresses surface recombination of carriers (electrons and holes). The antireflection film 23 can be formed of various oxide films such as a silicon oxide film and a titanium oxide film instead of the silicon nitride film. Further, the antireflection film 23 can be formed of another film having an antireflection effect in combination with the passivation film 22.

  The sealing material 4 is arrange | positioned between the photovoltaic cell 2 and the translucent board | substrate 5, and has adhered the photovoltaic cell 2 and the translucent board | substrate 5. FIG. The sealing material 4 is formed using, for example, an insulating resin that is transparent to sunlight. For example, the sealing material 4 can be formed of ethylene vinyl acetate resin or other resins. Further, the sealing material 4 may be formed of different resins or the like on the light receiving surface side and the back surface side of the solar battery cell 2. In this case, the sealing material 4 arrange | positioned at the back surface side of the photovoltaic cell 2 does not need to be transparent with respect to sunlight.

  The translucent substrate 5 is formed using, for example, a glass substrate or PC (polycarbonate resin) that is transparent to sunlight, but is not particularly limited as long as it is transparent to sunlight.

  For the back surface protective sheet 6, for example, a sheet material made of a weather resistant film conventionally used can be used. As a sheet material made of a weather resistant film, for example, an insulating film such as a PET (polyethylene terephthalate) film can be used. Note that, for example, a glass substrate may be used instead of the back surface protective sheet 6.

  The frame member 7 holds the entire circumference of the edge portion of the solar cell panel 30 via the insulating end face sealing member 8. The end surface sealing member 8 has water-stopping and elasticity, and the end surface of the solar cell panel 30 (the end surfaces (outer peripheral surfaces) of the translucent substrate 5, the sealing material 4, and the back surface protection sheet 6) and the frame member 7. It is arranged between. The end surface sealing member 8 is an example of the “insulating layer” in the present invention.

  The frame member 7 is made of a metal such as aluminum and has conductivity. For example, as shown in FIG. 3, the frame member 7 is configured in a rectangular shape in which a window portion 10 is formed in a central portion when seen in a plan view. In FIG. 3, an insulating film 9 described later is omitted. Moreover, the frame member 7 has a U-shaped cross section as shown in FIG.

  The frame member 7 is positioned above the upper surface 5 a of the light-transmitting substrate 5 that serves as the light receiving surface of the solar cell panel 30, and holds the upper surface of the solar cell panel 30. The lower surface holding part 7b which is located below and holds the lower surface of the solar cell panel 30, and the side wall part 7c which connects the upper surface holding part 7a and the lower surface holding part 7b are included. As shown in FIG. 4, the upper surface holding part 7 a is provided above the light transmitting substrate 5, a facing surface 7 d disposed opposite to the upper surface 5 a of the light transmitting substrate 5 (light receiving surface of the solar cell module 1), An inner side surface 7e provided above the light transmitting substrate 5 and disposed toward the inner side (center side) of the light transmitting substrate 5, and an upper surface 5a of the light transmitting substrate 5 provided above the light transmitting substrate 5. And an upper surface 7f parallel to the upper surface 7f. The side wall portion 7 c includes an end surface facing surface 7 g disposed to face the side end surface of the solar cell panel 30, and an outer surface 7 h that defines the outer shape of the frame member 7. The inner side surface 7 e defines the window portion 10. In the present embodiment, the inner inclined surface 7i that connects the inner surface 7e and the upper surface 7f is formed. However, the inner inclined surface 7i may not be formed, or the inner inclined surface 7e may be replaced with the inner inclined surface 7e. The surface 7i may be formed.

  The facing surface 7d, the inner side surface 7e, and the inner inclined surface 7i of the upper surface holding portion 7a form a rainwater storage portion 11 in which rainwater accumulates on the upper surface 5a of the translucent substrate 5. In addition, a rainwater storage part is a part in which water (for example, rainwater) can be stored when there is rain. For example, in a state where the solar cell module 1 is arranged in parallel to the horizontal plane, rainwater may be stored in the entire upper surface 5a of the translucent substrate 5 that forms the rainwater storage unit 11. The facing surface 7d, the inner side surface 7e, and the inner inclined surface 7i are rainwater storage portion forming surfaces that form the rainwater storage portion 11.

  In other words, on the light receiving surface side of the solar cell module 1, a space (rain water storage portion 11) surrounded by the upper surface 5 a of the translucent substrate 5 and the upper surface holding portion 7 a is formed. The facing surface 7d, the inner side surface 7e, and the inner inclined surface 7i are included in the surface of the holding member 7 facing the space (rainwater storage portion 11) surrounded by the upper surface 5a and the upper surface holding portion 7a of the translucent substrate 5. .

  The end surface facing surface 7 g is covered with an end surface sealing member 8. The facing surface 7 d is covered with the end surface sealing member 8 and the insulating layer 9. The inner side surface 7e, the inner inclined surface 7i, and the upper surface 7f are covered with an insulating layer 9. Thereby, as shown in FIG. 5, even when water (rain water) 50 is accumulated on the light receiving surface (surface) of the solar cell module 1 due to rain or the like (when water 50 is accumulated in the rain water storage unit 11). It is possible to prevent the upper surface 5a of the translucent substrate 5 and the holding member 7 from being electrically connected and having the same potential. 4 and 5, the insulating layer 9 and the end surface sealing member 8 are arranged without overlapping each other, but the insulating layer 9 and the end surface sealing member 8 partially overlap. Is preferred. Thereby, it becomes possible to more reliably cover the surface of the upper surface holding portion 7 a forming the rainwater storage portion 11 with the insulating layer 9 and the end surface sealing member 8. Furthermore, as shown in FIG. 6, the outer surface 7 h may also be covered with the insulating layer 9. That is, the entire surface of the upper surface holding portion 7 a may be covered with the end surface sealing member 8 and the insulating layer 9. Further, the entire surface of the frame member 7 may be covered with the insulating layer 9.

  As the insulating layer 9, it is preferable to use a material and a structure that are excellent in weather resistance and stably maintain insulation over a long period of time. Further, for example, the insulating layer 9 may be formed by applying an insulating resin to the frame member 7 and curing it, or by forming a resin film such as PET on the surface of the frame member 7. May be. In addition, when the frame member 7 is comprised by combining several members, it is preferable to make it the same structure also about the connection part of members. For example, after forming a plurality of members, an insulating resin may be applied to the target portion of each member and cured or a resin film may be attached, or after the frame member 7 is formed by combining a plurality of members, the frame An insulating resin may be applied to the target portion of the member 7 and cured, or a resin film may be attached.

  In the photovoltaic power generation system including the solar cell module 1, the frame member 7 is grounded via a wiring (not shown) or the like in order to ensure safety against electric shock. Further, although the potentials of the output terminal 3a and the output terminal 3b are determined by the state of the connected load, in the present embodiment, the potentials of the output terminal 3a and the output terminal 3b are higher than the ground potential. Even so, it is possible to suppress a decrease in the output of the solar cell module 1 (a decrease in power generation efficiency).

  Note that the solar power generation system may include a plurality of solar cell modules 1. In this case, the potential of the output terminal 3a and the output terminal 3b may be equal to or higher than the ground potential in all the solar cell modules 1, and the potential of the output terminal 3b in one (at least one) solar cell module 1 It may be higher than the ground potential.

  In the present embodiment, as described above, the facing surface 7d, the inner side surface 7e, and the inner inclined surface 7i of the frame member 7 (the space surrounded by the upper surface 5a of the translucent substrate 5 and the upper surface holding portion 7a (rainwater storage portion The surface of the frame member 7 facing 11) is covered with the insulating layer 9 and the end face sealing member 8. That is, the insulating layer 9 and the end surface sealing member 8 are provided between the upper surface 5a of the translucent substrate 5 and the facing surface 7d, the inner side surface 7e, and the inner inclined surface 7i of the frame member 7. Thereby, even when water accumulates on the surface of the solar cell module 1 due to rain or the like, the upper surface 5a of the translucent substrate 5 and the frame member 7 are prevented from being electrically connected to have the same potential. Can do. For this reason, it can suppress that the distance between the parts which produce a potential difference becomes near. Specifically, a potential difference applied between the frame member 7 and the solar battery cell 2 is prevented from being applied between the upper surface 5a of the translucent substrate 5 and the solar battery cell 2 due to water accumulation. can do. As a result, even when water accumulates on the surface of the solar cell module 1 due to rain or the like, it is possible to suppress the intensity of the electric field applied to the light receiving surface of the solar cell 2 from being increased. 1 can be prevented from decreasing (power generation efficiency is decreased).

  Further, as described above, the potential of the solar cell 2 is higher than the potential of the surroundings (outside the frame member 7 and the solar cell module 1), and the n-type silicon substrate 21 is used for the back electrode type solar cell 2. In this case, the output of the solar cell module 1 tends to decrease. This is particularly effective when the n-type silicon substrate 21 is used. Similarly, when the potential of the solar battery cell 2 is lower than that of the surroundings (outside of the frame member 7 and the solar battery module 1) and the p-type silicon substrate 21 is used for the back electrode type solar battery cell 2. The output of the solar cell module 1 is likely to decrease. Also in this case, by applying this embodiment, even when water accumulates on the surface of the solar cell module 1 due to rain or the like, the upper surface 5a of the translucent substrate 5 and the frame member 7 are electrically connected. It is possible to suppress the decrease in the output of the solar cell module 1.

  In addition, as described above, if the entire surface of the upper surface holding portion 7a is covered with at least one of the end surface sealing member 8 and the insulating layer 9, all of the portion above the upper surface 5a of the translucent substrate 5 is covered. It is covered with an insulating layer (end face sealing member 8 and insulating layer 9). For this reason, even if it is a case where water overflows from the upper surface holding part 7a, it can suppress more that the upper surface 5a of the translucent board | substrate 5 and the frame member 7 are electrically connected.

  Further, as described above, if the insulating layer 9 is formed of an insulating paint, the insulating layer 9 can be easily formed so as to cover the facing surface 7d, the inner side surface 7e, the inner inclined surface 7i, and the like. As the insulating paint, a fluorine-based paint is preferable because of its excellent weather resistance. Alternatively, the insulating layer 9 can be easily formed by coating a weather-resistant film such as a resin film such as a fluorine resin or an inorganic film such as an oxide film instead of the insulating paint.

  Further, as described above, when the frame member 7 is grounded and the potentials of the output terminals 3a and 3b that output the generated power of the solar cell module 1 are equal to or higher than the ground potential, the output of the solar cell module 1 is reduced. It's easy to do. For this reason, it is particularly effective when the potential of the output terminals 3a and 3b of the solar cell module 1 is equal to or higher than the ground potential.

  This can also be said when the photovoltaic power generation system includes a plurality of solar cell modules 1 and the potentials of the output terminals 3a and 3b in the at least one solar cell module 1 are equal to or higher than the ground potential. Even in such a configuration, the output of a solar cell module in which the potential of the output terminal is equal to or higher than the ground potential may decrease. Therefore, by applying this embodiment to at least the corresponding solar cell module, the solar cell module It becomes possible to suppress the fall of the output of a battery module.

(Second Embodiment)
In the solar cell module 1 of the second embodiment, as shown in FIG. 7, the frame member 7 is made of aluminum. The facing surface 7d is covered with the end surface sealing member 8 and the insulating layer 7j, and the inner side surface 7e and the upper surface 7f are covered with the insulating layer 7j. The insulating layer 7j is formed by anodizing the surface of the frame member 7. That is, the insulating layer 7j is a layer obtained by oxidizing (chemical reaction) aluminum.

  Other structures of the second embodiment are the same as those of the first embodiment.

  In the present embodiment, as described above, the insulating layer 7j is formed by anodizing the surface of the frame member 7. Thereby, the insulating layer 7j can be easily formed so as to cover the facing surface 7d, the inner surface 7e, and the upper surface 7f. Further, the insulating layer 7j can be easily formed so as to cover the entire surface of the upper surface holding portion 7a and the entire surface of the frame member 7.

  Other effects of the second embodiment are the same as those of the first embodiment.

(Third embodiment)
In the solar cell module 1 of 3rd Embodiment, as shown in FIG. 8, the back surface protection sheet 6 is extended from the back surface side of the solar cell panel 30 to the light-receiving surface side. Specifically, the back surface protection sheet 6 is formed up to the inner side surface 7 e of the frame member 7 through the translucent substrate 5 and the end surfaces of the sealing material 4. That is, the opposing surface 7d and the inner surface 7e of the frame member 7 are covered with the insulating back surface protective sheet 6 (insulating layer). The back surface protection sheet 6 formed up to the inner side surface 7e of the frame member 7 may be further extended to the upper surface 7f of the frame member 7. In this case, the opposing surface 7d, the inner side surface 7e, and the upper surface 7f of the frame member 7 are covered with the insulating back surface protective sheet 6 (insulating layer).

  Other structures of the third embodiment are the same as those of the first embodiment.

  In the present embodiment, as described above, it is not necessary to separately provide an insulating layer by covering the opposing surface 7d, the inner surface 7e, and the upper surface 7f with the back surface protective sheet 6. Moreover, since there is no dividing part in the part of the insulating layer (back surface protection sheet 6) which covers the surface of the upper surface holding part 7a, the upper surface 5a of the translucent substrate 5 and the frame member 7 can be insulated more reliably.

  Other effects of the third embodiment are the same as those of the first embodiment.

(Fourth embodiment)
In the solar cell module 1 of the fourth embodiment, as shown in FIG. 9, an insulating sheet 16 is provided from between the end surface of the solar cell panel 30 and the frame member 7 to the inner surface 7 e of the frame member 7. That is, the opposing surface 7d and the inner surface 7e of the frame member 7 are covered with the insulating sheet 16 (insulating layer). The sheet 6 formed up to the inner surface 7e of the frame member 7 may further be formed to extend to the upper surface 7f of the frame member 7. In this case, the facing surface 7d, the inner surface 7e, and the upper surface 7f of the frame member 7 are covered with an insulating sheet 16 (insulating layer). Further, the sheet 16 may be formed to extend to the edge of the back surface of the solar cell panel 30. In addition, the sheet | seat 16 may be formed with the same material as the back surface protection sheet 6, and may be formed with a different material.

  The other structure of the fourth embodiment is the same as that of the first embodiment.

  In the present embodiment, as described above, by using the sheet 16, the insulating layer (sheet 16) can be easily provided so as to cover the facing surface 7d, the inner surface 7e, and the upper surface 7f. For example, after the insulating sheet 16 is attached to the edge of the solar cell panel 30, the solar cell panel 30 is fitted between the upper surface holding portion 7a and the lower surface holding portion 7b of the frame member 7, or the frame member The insulating layer 16 can be formed by a simple process such as fitting the solar cell panel 30 into the frame member 7 after mounting the insulating sheet 16 between the upper surface holding portion 7a and the lower surface holding portion 7b. it can.

  Other effects of the fourth embodiment are the same as those of the first embodiment.

(Fifth embodiment)
In the solar cell module 1 of the fifth embodiment, as shown in FIG. 10, the end surface sealing member 8 extends from between the end surface of the solar cell panel 30 and the frame member 7 to the inner surface 7 e of the frame member 7. . That is, the opposing surface 7d and the inner surface 7e of the frame member 7 are covered with the insulating end surface sealing member 8 (insulating layer). The end surface sealing member 8 formed up to the inner side surface 7e of the frame member 7 may be further extended to the upper surface 7f of the frame member 7. In this case, the facing surface 7d, the inner side surface 7e, and the upper surface 7f of the frame member 7 are covered with the insulating end surface sealing member 8 (insulating layer).

  The end surface sealing member 8 used in the present embodiment has weather resistance so that it can withstand exposure to the outside, in addition to the water-stopping and resilience as a normal end surface sealing member, and also has ultraviolet light and the like. It preferably has a function of suppressing deterioration due to external light. Specifically, the end surface sealing member 8 may be a butyl rubber, ethylene propylene diene rubber, or silicone rubber added with an ultraviolet absorber or the like. The end surface sealing member 8 is preferably transparent or similar in color to the frame member 7. If comprised in this way, it can suppress that the end surface sealing member 8 is conspicuous with respect to the frame member 7, and it can improve the external appearance property of the solar cell module 1. FIG.

  Other structures of the fifth embodiment are the same as those of the first embodiment.

  In the present embodiment, as described above, it is not necessary to separately provide an insulating layer by covering the facing surface 7d, the inner side surface 7e, and the upper surface 7f with the end surface sealing member 8. Further, as in the third embodiment, since there is no part of the insulating layer (end surface sealing member 8) that covers the surface of the upper surface holding portion 7a, the upper surface 5a of the translucent substrate 5 and the frame member are more reliably included. 7 can be insulated.

  Other effects of the fifth embodiment are the same as those of the first embodiment.

(Sixth embodiment)
In the solar cell module 1 of the sixth embodiment, as shown in FIG. 11, the facing surface 7 d and the inner surface 7 e of the frame member 7 are covered with an insulating layer 19. The insulating layer 19 extends upward from the upper surface 7f of the upper surface holding portion 7a. Thus, even when water accumulates on the surface of the solar cell module 1 due to rain or the like, the water 50 on the upper surface 5a of the translucent substrate 5 and the water 51 on the upper surface 7f of the frame member 7 are separated. It is possible. The insulating layer 19 can be formed of various materials shown in the above embodiment. For example, as in the third to fifth embodiments, the back surface protective sheet 6, the sheet 16, or the end surface sealing member 8 is used. May be formed.

  In addition, as shown in FIG. 12, an insulating water repellent film 19 a (water repellent layer) is preferably formed on the surface of the insulating layer 19. Similarly, as shown in FIG. 13, an insulating water repellent cap 19 b (water repellent layer) may be covered on the protruding portion of the insulating layer 19.

  The other structure of the sixth embodiment is the same as that of the first embodiment.

  In the present embodiment, as described above, the insulating layer 19 extends above the upper surface 7f of the upper surface holding portion 7a. Thereby, since the water 50 on the upper surface 5a of the translucent substrate 5 and the water 51 on the upper surface 7f of the frame member 7 can be divided by the protruding portion of the insulating layer 19, the translucent substrate 5 can be further suppressed from being electrically connected to the upper surface 5a of the frame 5 and the frame member 7.

  Further, as described above, if the water repellent film 19 a is formed on the surface of the insulating layer 19 or the water repellent cap 19 b is covered on the protruding portion of the insulating layer 19, the upper surface 5 a of the translucent substrate 5 is covered. The water 50 and the water 51 on the upper surface 7f of the frame member 7 can be effectively divided by the water repellent film 19a or the water repellent cap 19b. Thereby, it can further suppress that the upper surface 5a of the translucent board | substrate 5 and the frame member 7 are electrically connected.

  The other effects of the sixth embodiment are the same as those of the first embodiment.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the above-described embodiment, an example using an n-type silicon substrate has been described. However, the present invention is not limited to this, and a p-type silicon substrate may be used. This is particularly effective when the potential of the solar battery cell is lower than the surrounding potential (outside of the frame member or the solar battery module).

  Moreover, although the said embodiment demonstrated the case where the photovoltaic cell was a back surface electrode type, this invention is not limited to this. Even when using solar cells in which electrodes are provided on each of the light receiving surface and the back surface, the output of the solar cell module may decrease, so electrodes are provided on each of the light receiving surface and the back surface. It is also effective to apply the present invention to a solar cell module using solar cells.

  Further, for example, in the first to fifth embodiments, the example in which the insulating layer is provided so as to cover the upper surface and the outer surface of the frame member (holding member) has been described. 7d and the inner side surface 7e (the surface of the holding member facing the space surrounded by the upper surface of the translucent substrate and the upper surface holding portion) may be covered with the insulating layer.

  Moreover, you may install so that a solar cell module may incline with respect to a horizontal surface like the solar power generation system by the 1st modification of this invention shown, for example in FIG. In this case, rainwater flows toward the lower side of the solar cell module (the right side in FIG. 14), so that rainwater is easily stored only in the lower side of the rainwater storage portion 11 of the solar cell module. That is, in a state where the solar cell module is installed inclined with respect to the horizontal plane, rainwater is likely to be stored only in a part of the upper surface 5a of the translucent substrate 5 (the right side portion in FIG. 14). For this reason, the lower part (right side in FIG. 14) of the upper surface 5a of the translucent substrate 5 and the frame member 7 are easily electrically connected, and the upper side (upper left side in FIG. 14) of the upper surface 5a of the translucent substrate 5. This part and the frame member 7 are not easily connected electrically.

  In FIG. 14, the solar cell module is inclined and installed such that the high-potential side solar cell 2 a is positioned above the low-potential side solar cell 2 b. When the upper surface 5a of the translucent substrate 5 and the frame member 7 are electrically connected, the intensity of the electric field applied to the light receiving surface of the high potential solar cell 2a is the light receiving surface of the low potential solar cell 2b. Higher than the intensity of the electric field applied. For this reason, in the structure of FIG. 14, since the solar cell module is inclined and installed so that the solar cell 2a on the high potential side is located in a portion (upper side) that is difficult to be electrically connected to the frame member 7. And it can suppress effectively that the output of a solar cell module falls.

  In FIG. 14, the insulating layer 9 may not be provided on the upper side (left side in FIG. 14) of the solar cell module. That is, the insulating layer 9 may not be provided on the entire circumference of the frame member 7, and a portion where rainwater may be stored among the portions forming the rainwater storage portion 11 (located on the right side in FIG. 14). The facing surface 7d and the inner side surface 7e, a predetermined area on the right side of the facing surface 7d and the inner side surface 7e located on the near side with respect to the paper surface, and the right side of the facing surface 7d and the inner side surface 7e located on the back side with respect to the paper surface It is only necessary that the insulating layer 9 be provided so as to cover the predetermined region. If the solar cell module installed at an inclination is covered with the insulating layer 9 or the end surface sealing member 8 at least a portion of the rainwater storage portion forming surface of the frame member 7 where rainwater may be stored is solar cell. It can suppress that the output of the module 1 falls. However, depending on the amount of rain, the upper part of the frame member 7 may be electrically connected to the surface of the translucent substrate 5, and the installation angle of the solar cell module is restricted. Since there is a problem, it is preferable that the insulating layer 9 is also provided on the upper side of the solar cell module.

  Further, for example, in the sixth embodiment, the example in which the water repellent layer is provided on the surface of the insulating layer when the insulating layer extends above the upper surface of the frame member has been shown, but the present invention is not limited thereto. Absent. For example, a water repellent layer may be provided on the surface of the insulating layer in the first to fifth embodiments.

  Moreover, in the said embodiment, although the frame member (holding member) showed about the example which has electroconductivity, the holding member may be formed with the insulating member, for example. If comprised in this way, since an electric field does not generate | occur | produce in the first place between a holding member and a photovoltaic cell, it is possible to prevent the fall of the output of a photovoltaic module by rain etc. The holding member may be formed of a conductive member (metal) and an insulating member.

  Moreover, in the said embodiment, although the example using the frame member holding the perimeter of the edge part of a translucent board | substrate was shown as a holding member, this invention is not limited to this. For example, like the solar cell module according to the second modification of the present invention shown in FIG. 15, the holding member 27 may be formed so as to hold only a part of the edge of the translucent substrate 5. If comprised in this way, it can suppress that water accumulates on the light-receiving surface of a solar cell module, and is more effective. Moreover, since it can suppress that water accumulates on the light-receiving surface of a solar cell module, it can suppress that the water on a light-receiving surface crawls up to the upper surface of an upper surface holding part. Thereby, even if the upper surface of the holding member 27 is not covered with an insulating layer, for example, the upper surface of the translucent substrate 5 and the holding member 27 can be easily suppressed from being electrically connected and having the same potential. Moreover, since the surface area of the holding member 27 is reduced, the amount (area) of the insulating layer can be reduced.

  Moreover, although the example which provided the antireflection film on the passivation film was shown in the said embodiment, this invention is not limited to this, An antireflection film may not be provided.

DESCRIPTION OF SYMBOLS 1 Solar cell module 2, 2a, 2b Back surface electrode type solar cell (solar cell)
3a, 3b Output end 4 Sealing material 5 Translucent substrate 5a Upper surface 6 Back surface protection sheet (insulating layer)
7 Frame member (holding member)
7a Upper surface holding portion 7d Opposing surface (the surface of the holding member facing the space surrounded by the upper surface of the translucent substrate and the upper surface holding portion)
7e Inner side surface (the surface of the holding member facing the space surrounded by the upper surface of the translucent substrate and the upper surface holding portion)
7f Upper surface 7i Inner inclined surface (the surface of the holding member facing the space surrounded by the upper surface of the translucent substrate and the upper surface holding portion)
7j, 9, 19 Insulating layer 8 End face sealing member (insulating layer)
16 sheet 19a water repellent film (water repellent layer)
19b Water repellent cap (water repellent layer)
21 silicon substrate 22 passivation film 24 n electrode 25 p electrode 27 holding member 30 solar cell panel

Claims (13)

A solar panel,
A conductive holding member for holding an edge of the solar cell panel;
With
The solar battery panel includes a solar battery cell, a translucent substrate disposed on a light receiving surface side of the solar battery cell, and a sealing material disposed between the solar battery cell and the translucent substrate. Including
The solar cell includes an n-type silicon substrate, an insulating passivation film provided on a light receiving surface of the silicon substrate, and an n electrode and a p electrode provided on the back surface of the silicon substrate,
The holding member includes an upper surface holding portion located above the upper surface of the light-transmitting substrate that serves as a light receiving surface of the solar cell panel,
The solar cell module, wherein a surface of the holding member facing a space surrounded by an upper surface of the translucent substrate and the upper surface holding portion is covered with an insulating layer.   The solar cell module according to claim 1, wherein the entire surface of the upper surface holding portion is covered with the insulating layer.   The solar cell module according to claim 1 or 2, wherein the insulating layer is formed of an insulating sheet.   The solar cell module according to claim 1, wherein the insulating layer is formed of an insulating paint. The surface of at least the upper surface holding part of the holding member is made of metal,
The solar cell module according to claim 1, wherein the insulating layer is a layer obtained by chemically reacting the metal. The solar cell panel includes an insulating back surface protection sheet disposed on the back surface side of the solar cell,
The solar cell module according to claim 1 or 2, wherein the insulating layer includes the back surface protection sheet extended from the back surface of the solar cell panel. An insulating end face sealing member disposed between the end face of the solar cell panel and the holding member;
The solar cell module according to claim 1, wherein the insulating layer includes the end surface sealing member extended from between an end surface of the solar cell panel and the holding member.   The solar cell module according to any one of claims 1 to 3, wherein the insulating layer extends upward from the upper surface holding portion.   The solar cell module according to claim 1, wherein a water repellent layer is provided on the surface of the insulating layer.   A solar power generation system comprising the solar cell module according to any one of claims 1 to 9. The holding member is grounded;
11. The photovoltaic power generation system according to claim 10, wherein a potential of an output terminal that outputs generated power of the solar cell module is equal to or higher than a ground potential. A plurality of the solar cell modules are provided,
The holding members of all the solar cell modules are grounded,
11. The photovoltaic power generation system according to claim 10, wherein in at least one of the solar cell modules, a potential of an output terminal that outputs generated power of the solar cell module is equal to or higher than a ground potential. The solar cell module includes a plurality of the solar cells connected in series with each other,
The solar cell module is installed to be inclined with respect to a horizontal plane so that the solar cell on the high potential side of the plurality of solar cells is positioned above the solar cell on the low potential side. The solar power generation system according to claim 11 or 12, wherein

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