JP2005183829A - Solar cell module and terminal box therefor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar cell module which has long-term high reliability without applying a stress to the soldered part of a terminal 2 to output wiring 4 even when a heat cycle is added to the solar cell module. <P>SOLUTION: A terminal box for the solar cell module includes a conductive terminal connected with the output wiring electrically connected to a solar cell element by soldering in an openable substantially box-like box. The terminal box for the solar cell module further includes a member having a female screw provided in the terminal box, and the terminal in which a through hole is formed with a diameter larger than the threaded part of the female screw. A male screw is inserted via the through hole, engaged, and an air gap is given between the head of the male screw and the surface of the terminal. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to the structure of a terminal box for a solar cell module, and more particularly to the structure of a terminal box for a solar cell module with improved reliability, and to a solar cell module equipped with the terminal box for a solar cell module.

  Solar cell elements are often manufactured using a single crystal silicon substrate or a polycrystalline silicon substrate. For this reason, the solar cell element is vulnerable to physical impact, and when the solar cell is installed outdoors, it is necessary to protect it from rain.

  Moreover, since the electrical output generated by one solar cell element is small, it is necessary to connect a plurality of solar cell elements in series and parallel so that a practical electrical output can be taken out. For this reason, a solar cell module is usually manufactured by connecting a plurality of solar cell elements and encapsulating with a sealing material mainly composed of a translucent substrate and an ethylene vinyl acetate copolymer (EVA). ing.

  In this solar cell module, the electrical output from the solar cell element inside the solar cell module is normally sent to a terminal box arranged on the back surface (non-light-receiving surface) side of the solar cell module, and inside the terminal box, via the terminal It is connected to a connection cable for connecting to an external circuit.

  FIG. 6 is a diagram showing an example of the inside of a terminal box for a solar cell module in the prior art.

  In FIG. 6, 1 is a terminal box body, 2 is a terminal, 3 is a slit in the back sheet, 4 is an output wiring, 5 is a bypass diode, 6 is a fixing screw, 7 is a connection cable, and 8 is a crimp terminal.

The terminal 2 is fixed to the terminal box body 1 with fixing screws 6. The output wiring 4 from the solar cell element (not shown) is taken out from the slit 3 portion from the back sheet into the terminal box and connected to the terminal 2 by soldering. Further, a connection cable 7 is connected to a terminal 2 to which the plus and minus output wirings 4 are connected by a crimp terminal 8. Further, the neutral output wiring 4 is also connected to a predetermined terminal 2 by soldering, and a bypass diode 5 is connected to these terminals 2. (See the prior art in Patent Document 1)
Prior art document information related to the invention of this application includes the following.
Japanese Patent Laid-Open No. 11-26035

  However, as described above, the terminal 2 is fixed to the terminal box body 1 by the fixing screw 6, and the output wiring 4 from the solar cell element is connected to the terminal 2 by soldering. Furthermore, the output wiring 4 from this solar cell element is a laminate (encapsulating a plurality of electrically connected solar cell elements by heating and pressurizing them with a filler under reduced pressure is called a laminate). This leads to the solar cell element enclosed in the filler. For this reason, the terminal 2 and the output wiring 4 are both fixed with little room for movement.

  When such a solar cell module is used outdoors for a long period of time, due to its temperature cycle, the soldered portions of the terminal 2 and the output wiring 4 are subjected to stress due to thermal expansion and contraction, and the soldered portions are cracked. May occur, resulting in high resistance and a decrease in solar cell output.

  The present invention has been made in view of such problems, and its purpose is that stress is applied to the soldered portions of the terminal 2 and the output wiring 4 even when a heat cycle is applied to the solar cell module. And to provide a long-term highly reliable solar cell module.

  In order to achieve the above object, the terminal box for a solar cell module of the present invention has a conductive shape in which an output wiring electrically connected to a solar cell element is connected by soldering in a substantially box-like box that can be opened. A terminal box for a solar cell module having a terminal, wherein the solar cell module terminal box has a member provided with a female screw, and the terminal having a through hole having a diameter larger than the threaded portion of the female screw. And a male screw is inserted into the female screw through the through hole and screwed, and a gap is provided between the head of the male screw and the surface of the terminal. .

  Another terminal box for a solar cell module of the present invention has a conductive terminal in which an output wiring electrically connected to the solar cell element is connected by soldering in a substantially box-like box that can be opened. A terminal box for a solar cell module, wherein a groove for fitting the terminal is formed inside the terminal box for the solar cell module, and a female screw is provided on the bottom surface of the groove. A through hole having a larger diameter is formed in the terminal, the terminal is fitted into the groove, a male screw is inserted into the female screw through the through hole, and is screwed, and the head of the male screw And a gap between the terminal and the surface of the terminal.

  Furthermore, another solar cell module terminal box of the present invention is characterized in that the gap is 0.05 mm to 0.5 mm.

  Moreover, the solar cell module of this invention mounted the terminal box for solar cell modules of Claim 1 or 2. It is characterized by the above-mentioned.

  According to the terminal box for a solar cell module of the present invention, a solar cell having a conductive terminal in which an output wiring electrically connected to a solar cell element is connected by soldering in a substantially box-like box that can be opened. A module terminal box, comprising a member provided with a female screw in the solar cell module terminal box, and the terminal having a through hole having a diameter larger than the threaded portion of the female screw, By inserting a male screw into the female screw through the through hole and screwing it in, and providing a space between the head of the male screw and the surface of the terminal, the terminal box for the solar cell module is provided. Since the terminal is placed on the surface of the terminal and held with a male screw, the terminal can be moved without being fixed, and the soldered terminal and the output wiring Even if thermal expansion and contraction occur in the user, the thermal expansion and thermal contraction can be absorbed by the movement of the terminal, and stress due to thermal expansion and thermal contraction may be applied to the soldered portion of the terminal and the output wiring. The reliability of the solar cell module can be improved.

  According to another terminal box for a solar cell module of the present invention, a conductive terminal in which an output wiring electrically connected to a solar cell element is connected by soldering in a substantially box-like box that can be opened. A terminal box for a solar cell module, wherein a groove for fitting the terminal is formed inside the terminal box for the solar cell module, a female screw is provided on the bottom surface of the groove, and the screw of the female screw is provided. A through hole having a diameter larger than that of the portion is formed in the terminal, the terminal is fitted into the groove, a male screw is inserted into the female screw through the through hole, and is screwed. By providing a gap between the head and the surface of the terminal, the terminal in the terminal box for the solar cell module is installed when the solar cell module is installed. Never Le is a terminal even when attached to a steep angle in the direction of rotation to rotate, the thermal expansion that occurs soldering portion of the terminal and the output wiring, it is possible to enhance the effect of absorbing the thermal contraction.

  Moreover, according to the other solar cell module terminal box of the present invention, by making the gap in the range of 0.05 mm to 0.5 mm, it is possible to completely absorb the dimensional change due to thermal expansion and thermal shrinkage, There is no case where the male screw hits the lid of the terminal box for the solar cell module.

  Moreover, according to the solar cell module of the present invention, a solar cell module with higher reliability can be obtained by mounting the terminal box for solar cell module according to claim 1 or 2.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 1 is a diagram showing an example of the structure of a solar cell panel unit according to the present invention.

  In the figure, 11 is a translucent substrate, 12 is a light-receiving surface side sealing material, 13 is a solar cell element, 14 is a back surface side sealing material, 15 is a back sheet, 16 is a connection wiring, 17 is an output wiring, Reference numeral 18 denotes a terminal box.

  Hereinafter, each member of the solar cell panel part in the terminal box for solar cell modules according to the present invention will be described.

  As the translucent substrate 11, a substrate made of glass or polycarbonate resin is used.

  As the glass plate, white plate glass, tempered glass, double tempered glass, heat ray reflective glass and the like are used, but generally white plate tempered glass having a thickness of about 3 mm to 5 mm is used.

  On the other hand, when a substrate made of a synthetic resin such as polycarbonate resin is used, a substrate having a thickness of about 5 mm is often used.

  The light-receiving surface side sealing material 12 and the back surface side sealing material 14 are made of an ethylene-vinyl acetate copolymer (hereinafter, ethylene-vinyl acetate copolymer is abbreviated as EVA), and have a thickness of about 0.4 to 1 mm. A sheet-like form is used. These are fused and integrated with other members by applying heat and pressure under reduced pressure using a laminating apparatus.

  EVA may contain titanium oxide, a pigment, etc., and may be colored white. In the light-receiving surface side sealing material 12 according to the present invention, when colored, the amount of light incident on the solar cell element 13 tends to decrease and power generation efficiency tends to decrease.

  Moreover, although EVA used for the back surface side sealing material 14 is good to comprise with a transparent material, other than this, it contains titanium oxide, a pigment, etc. according to the installation environment around a solar cell module, and this is colored white etc. May be.

  The solar cell element 13 is made of single crystal silicon or a polycrystalline silicon substrate having a thickness of about 0.3 to 0.4 mm.

  A PN junction is formed inside such a silicon substrate, electrodes are provided on the light receiving surface and the back surface, and an antireflection film is provided on the light receiving surface. The size of the solar cell element 13 is often about 100 to 150 mm square according to the polycrystalline silicon solar cell.

  Usually, a plurality of these solar cell elements 13 are used connected in series or in parallel by connecting wires 16 such as copper foil.

  The connection wiring 16 is for electrically connecting the solar cell elements. Usually, the entire surface of the copper foil having a thickness of about 0.1 mm and a width of about 2 mm is cut into a predetermined length, It is used by soldering on the electrode of the solar cell element 13.

  The output wiring 17 is used to transmit the electrical output generated by the solar cell element 13 to the solar cell module terminal box 18, and is usually solder-coated on the entire surface of a copper foil having a thickness of about 0.1 mm and a width of about 2 mm. The product is cut into a predetermined length, one end of which is soldered to the connection wiring 16 and the like, and the other end is soldered to a terminal in the solar cell module terminal box 18.

  As the back sheet 15, a weather-resistant fluorine-based resin sheet sandwiching an aluminum foil so as not to transmit moisture, a polyethylene terephthalate (PET) sheet deposited with alumina or silica, or the like is used.

  In addition, a slit is provided at a predetermined position of the back sheet 15, and the output wiring 17 is drawn out from the slit to the surface of the back sheet 15 in advance using tweezers before lamination.

  First, the above translucent substrate 11, the light receiving surface side sealing material 12, the solar cell element 13, the back surface side sealing material 14, and the back surface sheet 15 connected to the connection wiring 16 and the output wiring 17 are overlapped, and a laminator and It is set in a so-called apparatus and integrated by applying pressure while heating at a temperature of about 100 to 200 ° C. for about 15 to 60 minutes under a reduced pressure of about 50 to 150 Pa.

  Then, the solar cell module terminal box 18 is attached to the integrated solar cell panel.

  The solar cell module terminal box 18 is provided to connect an electrical output from the solar cell element 13 to an external circuit. As an example, a modified polyphenylene ether resin (modified PPE resin) is used in consideration of light resistance to ultraviolet rays, etc. Usually black.

  The terminal box 18 for solar cell modules which concerns on this invention is attached to the predetermined position of the back surface side of a solar cell panel part using an adhesive material etc.

  Further, the solar cell module terminal box 18 according to the present invention is divided into a main body part and a lid part so as to facilitate the soldering work after the attachment, and the lid part is fitted into the main body part or screwed. Fixed.

  The size of the solar cell module terminal box 18 according to the present invention may be determined optimally depending on the size of the solar cell module to be attached. As an example, one side is about 5 to 15 cm and the thickness is about 1 to 5 cm. Is.

  FIG. 2 is a diagram showing an embodiment of a terminal used in the terminal box for a solar cell module according to the present invention, and FIG. 3 is a terminal for the solar cell module according to an embodiment of the terminal box for the solar cell module according to the present invention. It is sectional drawing which shows a model when hold | maintaining on the surface in a box.

  In FIG. 2, 20 is a terminal box body, 22 is a terminal, 23 is a through hole provided in the terminal, 48 is an output wiring mounting portion of the terminal, 24 is a female screw provided in the box, 25 is a male screw, 26 is A slit on the back sheet, 27 is an output wiring, 28 is a bypass diode, and 29 is an opening for inserting a cable line.

  In another embodiment of the solar cell module terminal box according to the present invention shown in FIGS. 2 and 3, the terminal 22 is a bottom surface of the solar cell module terminal box in which the male screw 25 and the corresponding terminal 22 are arranged. The diameter of the through hole 23 for passing the male screw 25 held by the female screw 24 provided in the portion 51 and opened in the terminal 22 is larger than the diameter of the male screw portion of the male screw 25. It is desirable that a gap be provided between the head of the male screw 25 and the surface of the terminal 22 even in a state where the screw 25 is tightened.

  The female screw 24 provided on the bottom surface 51 in the terminal box for solar cell module may be a female screw in which an insert nut (hereinafter, a nut embedded in the terminal box body is abbreviated as an insert nut) is embedded. desirable. Long-term reliability is enhanced by providing a female screw with an insert net embedded in the bottom surface portion 51 rather than a female screw having a hole in the bottom surface portion 51 and a tap cut inside the hole.

  With such a structure, the terminal 22 can be moved without being fixed, and even if both the soldered terminal 22 and the output wiring 27 undergo thermal expansion and contraction, the terminal 22 does not move. By moving along with the thermal expansion and compression, it becomes possible to absorb the dimensional change due to the thermal expansion and thermal contraction, and the soldering portions of the terminal 22 and the output wiring 27 are subjected to compression and stretching stress due to thermal expansion and thermal contraction. This is eliminated, and the reliability of the solar cell module can be improved.

  In addition, the diameter of the through hole 23 opened through the terminal 22 for passing the male screw 25 is 0.1 mm to 1.0 mm larger than the diameter of the male screw portion of the male screw 25, and the head of the male screw 25 is It is desirable that the gap 52 between the surface of the terminal 22 is 0.05 mm to 0.5 mm.

  That is, if the difference between the diameter of the through hole 23 opened in the terminal 22 and the diameter of the male screw portion of the male screw 25 is less than 0.1 mm, the dimensional change due to thermal expansion and contraction cannot be completely absorbed. If the difference exceeds 1.0 mm, the diameter of the through hole 23 is large, so that the electrical resistance of the terminal 22 increases and the output of the solar cell module may decrease. Furthermore, when the gap 52 between the head of the male screw 25 and the surface of the terminal 22 is less than 0.05 mm, the dimensional change due to thermal expansion and contraction cannot be completely absorbed, and the gap 52 exceeds 0.5 mm. And the male screw 25 may hit the lid (not shown) of the terminal box.

  In FIG. 2, the terminal 22 is made of copper or the like, and the entire surface thereof is solder-coated.

  The shape of the terminal 22 is a rectangle having a step in the example shown in FIG. 2, but the shape is not limited to a rectangle, and a shape such as a square or a triangle can be freely formed.

  The approximate dimensions of the terminal 22 are optimally determined by the size of the solar cell module and the solar cell module terminal box. In the example shown in FIG. 2, the width is about 4 to 15 mm, the length is about 30 to 70 mm, and the thickness. The wiring mounting portion 48 to be soldered to the output wiring 23 is bent downward so as to be easily soldered, and further bent so as to protrude.

  It should be noted that female screws are provided at various locations within the solar cell module terminal box, such as the side surface within the solar cell module terminal box, as well as the bottom surface within the solar cell module terminal box. A terminal provided with a through hole can be held by a screw and a male screw.

  As described above, the slit 26 on the back sheet is provided to draw out the output wiring 27, and the output wiring 27 drawn out has an end portion of the wiring mounting portion 48 of the terminal 22 using a soldering iron or hot air. Soldered to

  The bypass diode 28 is provided in order to prevent a reverse bias voltage from being applied to the solar cell element when a part of the solar cell element in the solar cell module is shaded and the temperature of the solar cell element rising and being destroyed. It is what The bypass diode 28 is connected to each terminal 21 by screwing or soldering.

  A cable wire (not shown) for connection to an external circuit is inserted into the solar cell module terminal box through the opening 29, and a terminal to which a plus-side output wiring and a minus-side output wiring are connected by a crimping terminal or the like. 21 is screwed.

  When the connection in the solar cell module terminal box is completed, the lid of the solar cell module terminal box is closed, and a module frame (not shown) is attached to the four sides of the solar cell panel. This module frame is often made of aluminum or resin in consideration of the strength and cost required for the solar cell module.

  When it is made of aluminum, it is often made by extruding aluminum, and its surface is often subjected to alumite treatment or clear coating.

  After such a module frame is attached to each side of the solar cell panel portion, each corner portion of the module frame is screwed to complete the solar cell module.

  FIG. 4 is a cross-sectional view showing a model when a terminal in another embodiment of the solar cell module terminal box according to the present invention is held inside a groove provided in the solar cell module terminal box.

  As shown in FIG. 4, the groove 21 for fitting the terminal 22 is formed to be about 0.1 to 0.3 mm larger than the width and thickness of the terminal 22. Further, the groove 21 is formed integrally with the terminal box body 20 by injection molding or the like. In order to prevent the terminal 42 from rotating in the groove 21, the groove 21 may have a shape other than a circle, such as a square or a triangle, in addition to a belt-like rectangle.

  In another embodiment of the solar cell module terminal box according to the present invention shown in FIG. 4, a groove portion 21 for arranging the terminal 22 is provided in the solar cell module terminal box. The terminal 22 is held by a male screw 25 and a female screw 24 provided on the bottom surface portion of the groove portion 21 into which the terminal 22 is fitted, and is passed through the male screw 25 opened in the terminal 22. The diameter of the through hole 23 is larger than the diameter of the male screw portion of the male screw 25, and even when the male screw 25 is tightened, a gap is provided between the head of the male screw 25 and the surface of the terminal 22. It is desirable that

  As above, the female screw 24 provided on the bottom surface of the groove portion 21 is preferably a female screw in which an insert nut (hereinafter, a nut embedded in the terminal box body is abbreviated as an insert nut) is embedded. Long-term reliability is improved by providing a female screw in which an insert net is embedded in the bottom surface portion of the groove portion 21 rather than a female screw in which a hole is formed in the bottom surface portion of the groove portion 21 and tapped inside the hole.

  Such a terminal 22 is inserted into a groove 21 for fitting a terminal provided in the terminal box for the solar cell module, and a male screw 25 is grooved along a through hole provided in the terminal 22 from the surface side of the terminal 22. The terminal 22 is attached to the terminal box for the solar cell module by being inserted into the female screw 24 provided on the bottom surface portion 21 and fitting the male screw 25 and the female screw 24 together.

  Further, the shape of the terminal 22 is preferably a shape other than a circle so that the terminal 22 does not rotate in the groove 21 for fitting the terminal provided in the solar cell module terminal box.

  Further, the groove 21 is manufactured integrally with the terminal box body 20 by injection molding or the like. Further, the terminal 22 is made of a copper plate or the like, and a solder coat is applied to the entire surface. As an example, the approximate dimensions of the terminal 22 are about 4 to 12 mm in width, about 30 to 70 mm in length, and about 0.5 to 4 mm in thickness, and the portion to be soldered to the output wiring 23 is easy to solder. In this way, it is bent downward so that it protrudes further. Such a terminal 22 is fitted into the groove 21.

  In this way, the terminal 22 is held by the single male screw 25 and the female screw 24 provided on the bottom surface of the corresponding groove portion, so that the solar cell module is installed in the solar cell module terminal box at the time of installation. Even when the terminal 22 is attached at a steep angle in the direction of rotation, the terminal 22 does not rotate, so stress is applied to the vicinity of the connection point between the terminal 22 and the output wiring 27 attached on the terminal 22 by soldering. There is nothing.

  Further, by adopting such a structure, the terminal 22 can be moved without being fixed, and even if thermal expansion or thermal contraction occurs in both the soldered terminal 22 and the output wiring 27, the terminal 22 can be moved. Can move along with the thermal expansion and compression to absorb the dimensional change due to the thermal expansion and thermal contraction, and the terminal 22 and the output wiring 27 can be compressed and stretched by the thermal expansion and thermal contraction in the soldered portions. No stress is applied, and the reliability of the solar cell module can be improved.

  Similarly to the above, the diameter of the through hole 23 opened in the terminal 22 for passing the male screw 25 is larger by 0.1 mm to 1.0 mm than the diameter of the male screw portion of the male screw 25. Desirably, the gap 52 between the head and the surface of the terminal 22 is 0.05 mm to 0.5 mm.

  That is, if the difference between the diameter of the through hole 23 opened in the terminal 22 and the diameter of the male screw portion of the male screw 25 is less than 0.1 mm, the dimensional change due to thermal expansion and contraction cannot be completely absorbed. If the difference exceeds 1.0 mm, the diameter of the through hole 23 is large, so that the electrical resistance of the terminal 22 increases and the output of the solar cell module may decrease. Furthermore, when the gap 52 between the head of the male screw 25 and the surface of the terminal 22 is less than 0.05 mm, the dimensional change due to thermal expansion and contraction cannot be completely absorbed, and the gap 52 exceeds 0.5 mm. And the male screw 25 may hit the lid (not shown) of the terminal box.

  As described above, the slit 26 on the back sheet is provided to draw out the output wiring 23 as described above, and the output wiring 23 that has been drawn out has its end portion wired to the terminal 22 using soldering iron or hot air. Soldered to the mounting portion 48.

  The bypass diode 28 is provided in order to prevent a reverse bias voltage from being applied to the solar cell element when a part of the solar cell element in the solar cell module is shaded and the temperature of the solar cell element rising and being destroyed. It is what The bypass diode 28 is connected to each terminal 22 by screwing or soldering.

  A cable wire (not shown) for connection to an external circuit is inserted into the solar cell module terminal box through the opening 29, and a terminal to which a plus-side output wiring and a minus-side output wiring are connected by a crimping terminal or the like. 22 is screwed.

  When the connection in the solar cell module terminal box is completed, the lid of the solar cell module terminal box is closed, and a module frame (not shown) is attached to the four sides of the solar cell panel. This module frame is often made of aluminum or resin in consideration of the strength and cost required for the solar cell module.

  When it is made of aluminum, it is often made by extruding aluminum, and its surface is often subjected to alumite treatment or clear coating.

  After such a module frame is attached to each side of the solar cell panel portion, each corner portion of the module frame is screwed to complete the solar cell module.

  FIG. 5 is a diagram showing a terminal in still another embodiment of the terminal box for solar cell module according to the present invention, and FIG. 6 shows a terminal in yet another embodiment of the terminal box for solar cell module according to the present invention. It is sectional drawing which shows a model when it hold | maintains inside the groove | channel provided in the terminal box for battery modules.

  In FIG. 5, 20 is a terminal box body, 21 is a groove for fitting a terminal provided inside the terminal box for a solar cell module shifted from the lateral direction, 22 is a terminal, 23 is a through hole provided in the terminal, 48 is an output wiring attachment portion of the terminal, 24 is a female screw provided at the bottom of the groove portion, 25 is a male screw, 26 is a slit in the back sheet, 27 is an output wiring, 28 is a bypass diode, and 29 is for inserting a cable wire The opening is shown.

  As shown in FIG. 5, the groove 21 for fitting the terminal 22 is formed so as to cover a part of the terminal surface, and is about 0.1 to 0.3 mm larger than the width and thickness of the terminal 22. It is formed, and it is possible to fit the terminal 22 only from the lateral direction.

  Further, the groove 21 is formed integrally with the terminal box body 20 by injection molding or the like. The terminal 22 is made of a copper plate or the like, and a solder coat is applied to the entire surface. The approximate dimensions of the terminal 22 are about 4 to 12 mm in width, about 30 to 70 mm in length, and about 0.5 to 4 mm in thickness. The portion to be soldered with the output wiring 27 is downward so that it can be easily soldered. It is bent so as to be further bent. Such a terminal 22 is shifted from the lateral direction of the groove 21 and fitted into the groove 21.

  In another embodiment of the solar cell module terminal box according to the present invention shown in FIG. 5 and FIG. 6, a groove portion 21 for arranging the terminal 22 is provided in the solar cell module terminal box. The terminal 22 is held by a male screw 25 and a female screw 24 provided on the bottom surface portion of the groove portion 21 into which the terminal 22 is fitted, and is passed through the male screw 25 opened in the terminal 22. The diameter of the through hole 23 is larger than the diameter of the male screw portion of the male screw 25, and even when the male screw 25 is tightened, a gap is provided between the head of the male screw 25 and the surface of the terminal 22. It is desirable that

  As described above, the female screw 24 provided on the bottom surface of the groove portion 21 is preferably a female screw in which an insert nut is embedded. Long-term reliability is improved by providing a female screw in which an insert net is embedded in the bottom surface portion of the groove portion 21 rather than a female screw in which a hole is formed in the bottom surface portion of the groove portion 21 and tapped inside the hole.

  In this way, the terminal 22 is held by the single male screw 25 and the female screw 24 provided on the bottom surface of the corresponding groove portion, so that the solar cell module is installed in the solar cell module terminal box at the time of installation. Even when the terminal 22 is attached at a steep angle in the direction of rotation, the terminal 22 does not rotate, so stress is applied to the vicinity of the connection point between the terminal 22 and the output wiring 27 attached on the terminal 22 by soldering. There is nothing.

  Further, by adopting such a structure, the terminal 22 can be moved without being fixed, and even if thermal expansion or thermal contraction occurs in both the soldered terminal 22 and the output wiring 27, the terminal 22 can be moved. Can move along with the thermal expansion and compression to absorb the dimensional change due to the thermal expansion and thermal contraction, and the terminal 22 and the output wiring 27 can be compressed and stretched by the thermal expansion and thermal contraction in the soldered portions. No stress is applied, and the reliability of the solar cell module can be improved.

  Further, by adopting such a structure, the terminal 22 is loosely fitted in both the vertical direction and the horizontal direction, and the male screw 25 is not affected by a bad road of the solar cell module or a long distance transportation. , This will not bend.

  Similarly to the above, the diameter of the through hole 23 opened in the terminal 22 for passing the male screw 25 is larger by 0.1 mm to 1.0 mm than the diameter of the male screw portion of the male screw 25. Desirably, the gap 52 between the head and the surface of the terminal 22 is 0.05 mm to 0.5 mm.

  That is, if the difference between the diameter of the through hole 23 opened in the terminal 22 and the diameter of the male screw portion of the male screw 25 is less than 0.1 mm, the dimensional change due to thermal expansion and contraction cannot be completely absorbed. If the difference exceeds 1.0 mm, the diameter of the through hole 23 is large, so that the electrical resistance of the terminal 22 increases and the output of the solar cell module may decrease. Furthermore, when the gap 52 between the head of the male screw 25 and the surface of the terminal 22 is less than 0.05 mm, the dimensional change due to thermal expansion and contraction cannot be completely absorbed, and the gap 52 exceeds 0.5 mm. And the male screw 25 may hit the lid (not shown) of the terminal box.

  As described above, the slit 24 on the back sheet is provided to draw out the output wiring 27 as described above, and the output wiring 27 that has been pulled out has its end portion wired by using a soldering iron or hot air. Soldered to the mounting portion 28.

  The bypass diode 28 is provided in order to prevent a reverse bias voltage from being applied to the solar cell element when a part of the solar cell element in the solar cell module is shaded and the temperature of the solar cell element rising and being destroyed. It is what The bypass diode 28 is connected to each terminal 21 by screwing or soldering.

  Also, a cable wire (not shown) for connecting to an external circuit is inserted into the terminal box for the solar cell module through the opening 27, and a terminal to which the plus side output wiring and the minus side output wiring are connected by a crimping terminal or the like. 21 is screwed.

  When the connection in the solar cell module terminal box is completed, the lid of the solar cell module terminal box is closed, and a module frame (not shown) is attached to the four sides of the solar cell panel. This module frame is often made of aluminum or resin in consideration of the strength and cost required for the solar cell module.

  When it is made of aluminum, it is often made by extruding aluminum, and its surface is often subjected to alumite treatment or clear coating.

  After such a module frame is attached to each side of the solar cell panel portion, each corner portion of the module frame is screwed to complete the solar cell module.

  Moreover, when a solar cell module is formed using the above-described solar cell module terminal box of the present invention, problems such as poor connection of electrical paths can be eliminated, and a highly reliable solar cell module can be formed.

  In addition, this invention is not limited to the said embodiment, Many corrections and changes can be added within the scope of the present invention.

  For example, instead of holding the terminal on the bottom surface portion of the groove with the female screw and the male screw provided on the surface portion in the solar cell module terminal box or the bottom surface portion of the groove formed in the solar cell module terminal box. A hole is formed in the bottom surface portion of the groove formed in the surface portion in the terminal box for solar cell module or the bottom surface portion of the groove formed in the terminal box for solar cell module, The terminal may be held by a hole.

  Further, the solar cell element is not limited to a crystalline solar cell such as single crystal or polycrystalline silicon, and can be applied to a thin film solar cell.

It is a figure which shows an example of the structure of the solar cell panel part which concerns on this invention. It is a figure which shows one Example of the terminal used for the terminal box for solar cell modules which concerns on this invention. It is sectional drawing which shows a model when the terminal in one Example of the terminal box for solar cell modules which concerns on this invention is hold | maintained on the surface in the terminal box for solar cell modules. It is sectional drawing which shows a model when the terminal in the other Example of the terminal box for solar cell modules which concerns on this invention is hold | maintained inside the groove | channel provided in the terminal box for solar cell modules. It is a figure which shows the terminal in the further another Example of the terminal box for solar cell modules which concerns on this invention. It is sectional drawing which shows a model when the terminal in the further another Example of the terminal box for solar cell modules which concerns on this invention is hold | maintained inside the groove | channel provided in the terminal box for solar cell modules. It is a figure which shows an example inside the terminal box for solar cell modules in a prior art.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1,20: Terminal box body 2, 22: Terminal 3, 26: Back sheet slit 4, 17, 27: Output wiring 5, 28: Bypass diode 6: Fixed male screw 7: Connection cable 8: Crimp terminal 11: Transparent Optical substrate 12: Light receiving surface side sealing material 13: Solar cell element 14: Back surface side sealing material 15: Back surface sheet 16: Connection wiring 18: Solar cell module terminal box 21: Inside the solar cell module terminal box Groove 23 provided: Through hole 24 provided in the terminal 24: Female screw 25: Male screw 29: Opening portion 48 for inserting the cable wire 48: Soldering portion 51 of the terminal: Bottom portion 52 in the terminal box for the solar cell module : The gap between the head of the male screw and the surface of the terminal

Claims (4)

A terminal box for a solar cell module having a conductive terminal in which an output wiring electrically connected to a solar cell element is connected by soldering in a substantially box-shaped box that can be opened. A member provided with a female screw in the terminal box and the terminal having a through hole having a diameter larger than the threaded portion of the female screw, and a male screw is inserted into the female screw through the through hole. A terminal box for a solar cell module, wherein the terminal box is screwed and a gap is provided between the head of the male screw and the surface of the terminal. A terminal box for a solar cell module having a conductive terminal in which an output wiring electrically connected to a solar cell element is connected by soldering in a substantially box-shaped box that can be opened. Forming a groove for fitting the terminal inside the terminal box, providing a female screw on the bottom of the groove, forming a through hole in the terminal having a larger diameter than the threaded portion of the female screw, The terminal was fitted into the groove, and a male screw was inserted into the female screw through the through hole and screwed, and a gap was provided between the head of the male screw and the surface of the terminal. A terminal box for solar cell modules. The terminal box for a solar cell module according to claim 1 or 2, wherein the gap is 0.05 mm to 0.5 mm. A solar cell module comprising the solar cell module terminal box according to claim 1.

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