JP2013042087A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To meet a demand for a solar cell module which achieves good bondability between an electrode plate and a protection diode.SOLUTION: A solar cell module according to one embodiment of this invention includes: an insulation substrate having through holes which are respectively open on a lower surface and an upper surface serving as a light receiving surface; a first electrode layer disposed on the upper surface of the insulation substrate; a second electrode layer disposed on the lower surface of the insulation substrate; and a protection diode which is partially disposed in one of the through holes and electrically connecting with the first electrode layer and the second electrode layer. Further, the protection diode electrically connects with the first electrode layer through a connection member, and the connection member has a ribbon shape having a thickness smaller than the first electrode layer and covers the protection diode.

Description

  The present invention relates to a solar cell module.

  In recent years, development of a photoelectric conversion device having a photoelectric conversion element has been advanced. There exists a solar cell module which converts the energy of sunlight into electric power as an example photoelectric conversion apparatus. In particular, for the purpose of improving power generation efficiency, a concentrating solar cell module is being developed (see, for example, Patent Document 1). In the solar cell module, the photoelectric conversion element is a solar cell that converts solar energy into electric power.

  A solar cell module generally includes a protective diode such as a bypass diode that suppresses application of a reverse bias voltage to the solar cell so that an excessive load is not applied to the solar cell (for example, Patent Document 2).

JP 2006-332535 A JP 2005-183957 A

  When the protection diode is provided on the upper surface of the insulating substrate on which the solar battery cell is provided, the protection diode is also irradiated with sunlight. Therefore, the protection diode may be heated and desired performance may not be obtained. A through hole is provided in the insulating substrate, and a protective diode is disposed in the through hole, and an electrode plate that is disposed on the upper surface of the insulating substrate and is electrically connected to the solar battery cell is bonded to the upper surface of the protective diode. By doing so, possibility that sunlight will irradiate a protection diode can be reduced.

  However, in order to increase the photoelectric conversion efficiency of the solar cell module, it is required to increase the thickness of the electrode plate. Thermal stress is applied to the joint surface between the electrode plate and the protection diode due to the difference in thermal expansion between the electrode plate and the protection diode. However, when the thickness of the electrode plate increases, the electrode plate is difficult to deform. Therefore, there is a possibility that the bondability between the electrode plate and the protection diode is lowered.

  This invention is made | formed in view of the said subject, and it aims at providing the solar cell module with favorable joining property of an electrode plate and a protection diode.

  A solar cell module according to an aspect of the present invention is provided on an insulating substrate having a first through hole and a second through hole that open on a lower surface and an upper surface that is a light receiving surface, respectively, and the upper surface of the insulating substrate. A first electrode layer; a second electrode layer disposed on the lower surface of the insulating substrate; and at least a portion disposed in the first through-hole; and the first electrode layer and The solar cell electrically connected to the second electrode layer, and at least a part of the solar battery cell are disposed in the second through-hole, and the first electrode layer and the second electrode layer are electrically connected to each other. Protective diodes connected to each other. The protection diode is electrically connected to the first electrode layer through a connection member, and the connection member has a ribbon shape smaller in thickness than the first electrode layer, and the protection diode It is characterized by covering the diode.

  In the solar cell module according to the above aspect, the protective diode is covered with a ribbon-shaped connecting member having a thickness smaller than that of the first electrode layer. Thereby, it is possible to improve the bonding property between the connection member and the protection diode by deforming the connection member having a relatively small thickness while suppressing direct irradiation of the protection diode with sunlight. Therefore, the thickness of the first electrode layer can be increased to increase the photoelectric conversion efficiency of the solar cell module, and the performance of the protection diode can be satisfactorily extracted.

It is a perspective view which shows the solar cell module of the 1st Embodiment of this invention. It is a top view of the solar cell module shown in FIG. FIG. 3 is an enlarged plan view of a region A in the solar cell module shown in FIG. It is XX sectional drawing of the solar cell module shown in FIG. FIG. 5 is an enlarged plan view of a region B in the solar cell module shown in FIG. 4. It is an enlarged plan view which shows the modification of the solar cell module shown in FIG. It is a perspective view which shows the solar cell module of the 2nd Embodiment of this invention. It is YY sectional drawing of the solar cell module shown in FIG.

  Hereinafter, the solar cell module of each embodiment (hereinafter also simply referred to as a module) will be described in detail with reference to the drawings. However, for convenience of explanation, each drawing referred to below is a simplified illustration of main members and the like necessary for explaining the present invention among the constituent members of the embodiment. Therefore, the module of the present invention may include any components not shown in the drawings to which the present specification refers. Moreover, the dimension of the member in each figure does not represent the dimension of an actual structural member, the dimension ratio of each member, etc. faithfully.

  As shown in FIGS. 1 to 5, the solar cell module 1 of the present embodiment includes an insulating substrate 3 having a first through hole 3 a and a second through hole 3 b that open on the lower surface and the upper surface that is a light receiving surface, respectively. At least a part of the first electrode layer 5 disposed on the upper surface of the insulating substrate 3, the second electrode layer 7 disposed on the lower surface of the insulating substrate 3, and the first through hole 3 a is disposed. And at least a part of the solar cell 9 electrically connected to the first electrode layer 5 and the second electrode layer 7 and the second through hole 3b, and the first electrode And a protective diode 11 electrically connected to the layer 5 and the second electrode layer 7. The protection diode 11 is electrically connected to the first electrode layer 5 through the connection member 13. The connection member 13 has a ribbon shape smaller in thickness than the first electrode layer 5 and covers the protection diode 11.

  Since the upper surface side of the insulating substrate 3 is the light receiving surface, the first electrode layer 5 disposed on the upper surface of the insulating substrate 3 absorbs sunlight and generates heat. The first electrode layer 5 greatly expands by absorbing sunlight. On the other hand, in order to increase the photoelectric conversion efficiency of the solar cell module 1, the thicknesses of the first electrode layer 5 and the second electrode layer 7 are increased, and the module is interposed via the first electrode layer 5 and the second electrode layer 7. 1 is required to improve heat dissipation. However, as the thickness of the first electrode layer 5 and the second electrode layer 7 increases, the first electrode layer 5 and the second electrode layer 7 increase in thermal expansion and become difficult to deform.

  Therefore, when the upper surface of the protection diode 11 is simply joined to the first electrode layer 5 for the purpose of suppressing the irradiation of sunlight to the protection diode 11, the first electrode layer 5, the protection diode 11, A large difference in thermal expansion occurs between the first electrode layer 5 and the protective diode 11, and a large thermal stress is likely to be applied. As a result, the bondability between the electrode plate and the protection diode 11 may be reduced.

  However, in the module 1 of this embodiment, the protective diode 11 is not directly joined to the first electrode layer 5, but the protective diode 11 is electrically connected to the first electrode layer 5 via the connection member 13. Connected. The connection member 13 has a ribbon shape smaller in thickness than the first electrode layer 5 and covers the protection diode 11.

  Thus, since the connection member 13 has a ribbon shape with a thickness smaller than that of the first electrode layer 5, it is more easily elastically deformed than the first electrode layer 5. For this reason, even when the first electrode layer 5 and the connection member 13 located on the upper surface side of the insulating substrate 3 are largely thermally expanded, the connection member 13 is easily bent and deformed. It is possible to reduce the possibility that a large stress is generated at the joint portion.

  Moreover, since the connection member 13 is ribbon-shaped and covers the protection diode 11, it is possible to prevent the protection diode 11 from being directly irradiated with sunlight. Therefore, in the module 1 of the present embodiment, the thickness of the first electrode layer 5 is increased to increase the heat dissipation of the module 1 via the first electrode layer 5 to increase the photoelectric conversion efficiency, and the protection diode 11 The performance of can be drawn out well.

  The insulating substrate 3 in the present embodiment has a quadrangular plate shape, and has a first through hole 3a and a second through hole 3b that open on the lower surface and the upper surface, respectively. As an exemplary size of the insulating substrate 3, in the case of a square plate shape, a member having a side of about 20 to 400 mm and a thickness of about 0.5 to 4 mm when viewed in plan can be used.

  In the module 1 of the present embodiment, the upper surface side of the insulating substrate 3 is the light receiving surface. The solar cells 9 are disposed in the first through holes 3a as described later. A protection diode 11 is disposed in the second through hole 3b as will be described later. Although the insulating substrate 3 of the present embodiment has one first through hole 3a, the insulating substrate 3 has a plurality of first through holes 3a, and a solar cell is provided in each first through hole 3a. The cell 9 may be placed. In the present embodiment, the insulating substrate 3 has a square plate shape, but is not limited thereto. For example, the insulating substrate 3 may be a polygonal plate shape such as a hexagonal plate shape or an octagonal plate shape, or may be a disk shape.

  As the insulating substrate 3, a member having a good insulating property is used in order to suppress an electrical short circuit between the first electrode layer 5 and the second electrode layer 7. Specifically, as the insulating substrate 3, for example, an aluminum oxide sintered body, a mullite sintered body, a silicon carbide sintered body, an aluminum nitride sintered body, a silicon nitride sintered body, or a ceramic such as a glass ceramic A substrate made of a resin material such as glass epoxy, acrylic, or epoxy can be used.

  A mixing member is prepared by mixing the raw material powder containing these glass powder or ceramic powder, an organic solvent, and a binder. A plurality of ceramic green sheets are produced by forming the mixed member into a sheet. A laminated body is produced by laminating a plurality of produced ceramic green sheets. The insulating substrate 3 is manufactured by firing the laminated body at a temperature of about 1600 degrees. The insulating substrate 3 is not limited to a configuration in which a plurality of insulating members are stacked. You may be comprised by one insulating member.

The first through hole 3a may be of a size that allows the solar cells 9 to be disposed therein. For example, the first through hole 3a may be a rectangular through hole having a side of about 7 to 25 mm when viewed in plan. Good. The second through hole 3b may be of a size that allows the protective diode 11 to be disposed therein. For example, the second through hole 3b may be a rectangular through hole having a side of about 5 to 25 mm when viewed in plan. That's fine.

  The module 1 of the present embodiment includes a first electrode layer 5 disposed on the upper surface of the insulating substrate 3. The first electrode layer 5 is electrically connected to the solar battery cell 9 disposed in the first through hole 3a and the protection diode 11 disposed in the second through hole 3b. The first electrode layer 5 is electrically connected to external wiring (not shown), and electricity generated in the solar battery cell 9 is taken out to the outside through the external wiring.

  The first electrode layer 5 in the present embodiment has a square plate shape. The first electrode layer 5 has positions corresponding to the first through hole 3a and the second through hole 3b of the insulating substrate 3, specifically, the first through hole 3a and the second through hole 3b. Through holes are formed at positions overlapping vertically. As an exemplary size of the first electrode layer 5, a square plate-shaped member having a side of about 20 to 500 mm and a thickness of about 0.5 to 2 mm when viewed in plan can be used. .

  As the first electrode layer 5, it is preferable to use a member having good conductivity. Specifically, a metal material such as tungsten, molybdenum, manganese, nickel, copper, silver, and gold can be used as the first electrode layer 5. The above metal materials may be used alone or as an alloy. The first electrode layer 5 is formed using a thin film forming technique such as screen printing, vapor deposition, or sputtering. Alternatively, the first electrode layer 5 may be formed by bonding a plate-shaped metal member formed in a predetermined shape to the upper surface of the insulating substrate 3.

  The module 1 of this embodiment includes a second electrode layer 7 disposed on the lower surface of the insulating substrate 3. Similarly to the first electrode layer 5, the second electrode layer 7 is respectively connected to the solar battery cell 9 disposed in the first through hole 3 a and the protection diode 11 disposed in the second through hole 3 b. Electrically connected. The second electrode layer 7 is electrically connected to external wiring (not shown).

  The second electrode layer 7 in this embodiment has a square plate shape. The first electrode layer 5 has through holes formed at positions corresponding to the first through hole 3a and the second through hole 3b of the insulating substrate 3, respectively. Such a through hole is not formed. The solar cells 9 and the protective diodes 11 are respectively disposed at positions where the first through holes 3a and the second through holes 3b of the insulating substrate 3 are vertically overlapped on the upper surface of the second electrode layer 7. . As an exemplary size of the second electrode layer 7, like the first electrode layer 5, one side in a plan view is about 20 to 500 mm and the thickness is about 0.5 to 2 mm. A square plate-shaped member can be used.

  As the second electrode layer 7, a member having good conductivity is preferably used. Specifically, the same metal material as that of the first electrode layer 5 can be used. The second electrode layer 7 is formed using a thin film forming technique similar to that of the first electrode layer 5. Alternatively, the second electrode layer 7 may be formed by bonding a plate-shaped metal member formed in a predetermined shape to the upper surface of the insulating substrate 3.

The module 1 of the present embodiment includes solar cells 9 that are disposed in the first through holes 3 a and are electrically connected to the first electrode layer 5 and the second electrode layer 7. The solar battery cell 9 is a solar battery element containing a III-V group compound semiconductor, for example. The photovoltaic cell 9 can convert the received light energy into electric power and output it by the photovoltaic effect. For example, the solar cell element has an InGaP / GaAs / Ge three-junction cell structure. An indium gallium phosphide (InGaP) top cell converts light contained in a wavelength region of 660 nm or less into electric energy. The gallium arsenide (GaAs) middle cell converts light contained in a wavelength region from 660 to 890 nm into electric energy. The germanium (Ge) bottom cell converts light contained in a wavelength region from 890 to 2000 nm into electric energy. The three cells are connected in series via a tunnel junction. The open circuit voltage is the sum of the electromotive voltages of the three cells. As an exemplary size of the solar battery cell 9 composed of the three cells, a square column shape in which one side in a plan view is about 5 to 20 mm and a thickness is about 0.5 to 2 mm is used. Can do.

  The lower surface electrode of the solar battery cell 9 is formed on the lower surface of the solar battery cell 9. The lower surface electrode is formed of, for example, a metal member such as silver or aluminum, and is electrically connected to the second electrode layer 7 via a bonding material such as low melting point solder or conductive epoxy resin. Further, the upper surface electrode of the solar battery cell 9 is formed on the upper surface of the solar battery cell 9. The upper surface electrode is formed of, for example, a metal member such as silver or aluminum, and is electrically connected to the first electrode layer 5 via the energization member 15.

  The module 1 of the present embodiment includes a protective diode 11 that is at least partially disposed in the second through-hole 3 b and is electrically connected to the first electrode layer 5 and the second electrode layer 7. ing. The protection diode 11 is a member for protecting the solar battery cell 9 from being applied with an excessive electrical load. As the protection diode 11, for example, a bypass diode that suppresses application of a reverse bias voltage to the solar battery cell 9 is used. The upper surface side of the protection diode 11 is electrically connected to the first electrode layer 5 via the connection member 13. The lower surface side of the protection diode 11 is joined to the second electrode layer 7.

  A part of the protective diode 11 may be disposed in the second through hole 3b, but all of the protective diode 11 may be disposed in the second through hole 3b as in the present embodiment. preferable. In other words, the upper surface of the first electrode layer 5 is preferably positioned above the protection diode 11. This is because the irradiation of the sunlight to the protection diode 11 can be further reduced.

  The shape of the protective diode 11 is not particularly limited, and may be, for example, an elliptical sphere. However, in order to be stably disposed in the second through hole 3b, In order to improve the bonding property, it is preferable to have a column shape having an upper surface and a lower surface. For example, the semiconductor element itself constituting the protection diode 11 is made into a block shape, or the semiconductor element constituting the protection diode 11 is coated with a resin and this resin is made into a block shape, thereby easily protecting the prismatic shape. A diode 11 can be formed.

  Further, the protection diode 11 is preferably separated from the insulating substrate 3. Even when the heat generated in the solar battery cell 9 is transmitted to the insulating substrate 3, it is possible to prevent this heat from being transmitted directly from the insulating substrate 3 to the protection diode 11. Therefore, the durability of the protection diode 11 can be improved.

  In particular, it is preferable that a gap exists between the protective diode 11 and the insulating substrate 3. The thermal stress resulting from the difference in thermal expansion between the protective diode 11 and the insulating substrate 3 can be released to this gap. Therefore, the durability of the protection diode 11 itself and the bonding property between the protection diode 11 and the second electrode layer 7 can be improved.

The connection member 13 in the present embodiment has a ribbon shape smaller in thickness than the first electrode layer 5 and covers the protection diode 11. Thus, since the connection member 13 is ribbon-shaped and covers the protection diode 11, it is possible to prevent the protection diode 11 from being directly irradiated with sunlight. In addition, since the connecting member 13 has a shape smaller in thickness than the first electrode layer 5, the connecting member 13 is more easily elastically deformed than the first electrode layer 5. Therefore, since the connecting member 13 is easily bent and deformed, even when the first electrode layer 5 and the connecting member 13 located on the upper surface side of the insulating substrate 3 are largely thermally expanded, the connecting member 13 and the protection diode 11 are used. It is possible to reduce the possibility that a large stress is generated at the joint portion.

  In the present embodiment, “the connecting member 13 covers the protective diode 11” means that the connecting member 13 and the protective diode 11 overlap each other vertically as shown in FIGS. The state in which the protective diode 11 cannot be visually recognized by the connection member 13 is intended. That is, it does not mean that the entire surface of the protection diode 11 is covered with the connection member 13.

  One end of the ribbon-shaped connecting member 13 in the long side direction is connected to the protection diode 11. The other end portion in the long side direction of the ribbon-shaped connection member 13 is connected to the first electrode layer 5. As an exemplary size of the connecting member 13, a member having a long side of about 10 to 50 mm, a short side of about 5 to 20 mm, and a thickness of about 0.1 to 1.5 mm in plan view is used. be able to.

  In order to prevent the protective diode 11 from being directly irradiated not only by sunlight from directly above but also by sunlight from obliquely above, the connecting member 13 is preferably slightly larger than the protective diode 11 in plan view. . For example, when seen through a plane, the connecting member 13 is made slightly larger than the protective diode 11 so that the width between the outer periphery of the connecting member 13 and the outer periphery of the protective diode 11 is about 1 to 5 mm. It is possible to prevent the protective diode 11 from being directly irradiated by sunlight from above.

  As the connection member 13, a member having good conductivity is preferably used. Specifically, the same metal material as that of the first electrode layer 5 can be used. Further, in order to suppress an excessive stress from being applied to the joint portion between the connection member 13 and the protection diode 11, it is preferable to use a member that is easily elastically deformed as the connection member 13. Specifically, it is preferable to use copper because it can be manufactured at low cost.

  Moreover, it is preferable that the connection member 13 has a bending part between the part joined to the protective diode 11 and the part joined to the first electrode layer 5. Since the connecting member 13 has such a bent portion, the connecting member 13 is further easily deformed. Therefore, even when the first electrode layer 5 and the connecting member 13 are largely thermally expanded, the connecting member 13 The possibility that a large stress is generated at the joint portion between the protective diode 11 and the protective diode 11 can be further reduced.

  In particular, as shown in FIG. 6, the upper end of the bent portion is positioned higher than the joint portion between the connection member 13 and the protective diode 11 and the joint portion between the connection member 13 and the first electrode layer 5. It is preferable that the bending part is formed in the. This is because the connecting member 13 is more easily deformed by having such a bent portion.

  Further, the reflectance of the upper surface of the connection member 13 is preferably larger than the reflectance of the first electrode layer 5. When a large thermal expansion difference occurs between the connection member 13 and the protection diode 11, a large thermal stress is easily applied to the joint surface between the connection member 13 and the protection diode 11. When the reflectance of the upper surface of the connection member 13 is larger than the reflectance of the first electrode layer 5, light absorption at the upper surface of the connection member 13 can be reduced. Therefore, since the absorption of sunlight in the connecting member 13 is suppressed, it is suppressed that the temperature of the connecting member 13 rises excessively. As a result, the difference in thermal expansion between the connection member 13 and the protection diode 11 can be reduced.

The solar battery cell 9 is electrically connected to the first electrode layer 5 through a wire-like energizing member 15. It is possible to energize even if a ribbon-shaped member is used as the energizing member 15 similarly to the connecting member 13. However, when a ribbon-shaped member is used as the energizing member 15, the area of the upper surface of the solar battery cell 9 covered by the energizing member 15 increases. Therefore, it becomes difficult to increase the photoelectric conversion efficiency in the solar battery cell 9.

  In other words, in order to prevent the protective diode 11 from being directly irradiated with sunlight, the protective diode 11 is connected to the ribbon-shaped connecting member 13 while increasing the photoelectric conversion efficiency in the solar battery cell 9. The wire-shaped energizing member 15 is connected to the solar battery cell 9 so that the area covering the upper surface is small.

  As the energizing member 15, it is preferable to use a member having good conductivity. Specifically, similarly to the connection member 13, a metal material such as tungsten, molybdenum, manganese, nickel, copper, silver, and gold can be used.

  The module 1 according to this embodiment includes a light collecting member 17 disposed on the first electrode layer 5. The condensing member 17 is a member for condensing sunlight irradiated from above the module 1 onto the solar battery cell 9. Specifically, the light collecting member 17 in the module 1 of the present embodiment is a hemispherical member made of a translucent member. 2 and 3, the condensing member 17 is not shown for the sake of convenience in order to clarify the configuration of the main members of the module 1.

  The light incident on the upper surface of the light collecting member 17 is refracted on the upper surface of the light collecting member 17. Since the upper surface side of the condensing member 17 of the present embodiment has a curved surface shape, the light refracted on the upper surface of the condensing member 17 is condensed in the center while traveling through the condensing member 17. And in the module 1 of this embodiment, since the photovoltaic cell 9 is located under the center of the lower surface of the condensing member 17, the solar cell 9 is irradiated with the light condensed in the condensing member 17 can do.

  The condensing member 17 in the module 1 of this embodiment consists of a translucent member. As the translucent member, for example, a translucent glass member, a translucent insulating resin such as a silicone resin, an acrylic resin, and an epoxy resin can be used. In particular, by using the above insulating resin as a translucent member and disposing the condensing member 17 so as to cover the solar cell 9, the condensing member 17 can be used as a sealing member for the solar cell 9. Can be used.

  Next, the solar cell module 1 of 2nd Embodiment is demonstrated in detail using drawing. In addition, in each structure concerning this embodiment, about the structure which has the same function as 1st Embodiment, the same referential mark is attached and the detailed description is abbreviate | omitted.

  7-8, the solar cell module 1 of this embodiment differs in the structure of the condensing member 17 compared with the module 1 of 1st Embodiment. That is, the light condensing member 17 in the module 1 of the present embodiment is joined to the frame body 17a provided on the upper surface of the insulating substrate 3 so as to surround the solar battery cell 9 and the entire circumference of the frame body 17a. And a condensing prism 17b provided above the solar battery cell 9 with a gap therebetween.

  The light collecting member 17 in this embodiment includes a frame body 17a provided on the upper surface of the insulating substrate 3 so as to surround the mounting region. The frame body 17a has a function of supporting the condensing prism 17b. As the frame body 17a, for example, similarly to the insulating substrate 3, for example, an aluminum oxide sintered body, a mullite sintered body, a silicon carbide sintered body, an aluminum nitride sintered body, and a silicon nitride sintered body are used. A ceramic material such as, or a glass ceramic material can be used.

In addition to a member having good insulating properties, for example, a metal member such as iron, copper, nickel, chromium, cobalt, and tungsten, or an alloy made of these metals can be used. A metal member constituting the frame body 17a can be produced by subjecting such an ingot of the metal member to a metal processing method such as a rolling method or a punching method. Further, the frame body 17a may be composed of one member, but may be a laminated structure of a plurality of members.

  Moreover, the condensing member 17 in this embodiment is provided with the condensing prism 17b supported by the frame 17a. The condensing prism 17 b has translucency and has a function of guiding sunlight incident from the upper surface to the solar battery cell 9. The translucency of the condensing prism 17b means that light included in at least a part of the wavelength region of sunlight can be transmitted. The condensing prism 17b is, for example, borosilicate glass.

  Moreover, the shape of the condensing prism 17b is a truncated cone shape in which the cross-sectional area decreases from the upper end portion to the lower end portion of the condensing prism 17b toward the solar battery cell 9. The light that reaches the condenser prism 17b is repeatedly reflected at the interface between the inside and the outside of the condenser prism 17b. The condensing prism 17 b has a function of equalizing the intensity distribution of the light energy in the cross-sectional area by reflection in the process toward the solar battery cell 9. A metal thin film may be provided around the condensing prism 17b as a reflecting member having a function of reflecting sunlight, for example, by vapor deposition.

  As mentioned above, although the solar cell module 1 of each embodiment of this invention has been demonstrated, this invention is not limited to the above-mentioned embodiment. In other words, various modifications and combinations of embodiments may be made without departing from the scope of the present invention.

1 ... Solar cell module
DESCRIPTION OF SYMBOLS 3 ... Insulating substrate 3a ... 1st through-hole 3b ... 2nd through-hole 5 ... 1st electrode layer 7 ... 2nd electrode layer 9 ... Solar cell 11 ... Protective diode 13 ... Connecting member 15 ... Conducting member 17 ... Condensing member 17a ... Frame body 17b ... Condensing prism

Claims (7)

An insulating substrate having a first through-hole and a second through-hole respectively opening on the lower surface and the upper surface which is a light-receiving surface;
A first electrode layer disposed on the upper surface of the insulating substrate;
A second electrode layer disposed on the lower surface of the insulating substrate;
A solar cell disposed at least in part in the first through-hole and electrically connected to the first electrode layer and the second electrode layer;
A solar cell module including at least a part of the second through hole, and a protective diode electrically connected to the first electrode layer and the second electrode layer;
The protective diode is electrically connected to the first electrode layer via a connecting member;
The solar cell module, wherein the connection member has a ribbon shape smaller in thickness than the first electrode layer and covers the protection diode.   The solar cell module according to claim 1, wherein an upper surface of the first electrode layer is located above the protection diode.   2. The solar cell according to claim 1, wherein the connection member has a bending portion between a portion bonded to the protective diode and a portion bonded to the first electrode layer. module.   2. The solar cell module according to claim 1, wherein a reflectance of an upper surface of the connection member is larger than a reflectance of an upper surface of the first electrode layer.   The solar cell module according to claim 1, wherein the protection diode is separated from the insulating substrate.   The solar cell module according to claim 5, wherein a gap exists between the protection diode and the insulating substrate. 2. The solar cell module according to claim 1, wherein the solar cell is electrically connected to the first electrode layer through a wire-shaped energizing member.

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