JP2009246039A - Terminal box device for use in solar battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a terminal box device capable of minimizing stress applied to a curve of a tab line for use in a solar battery module. <P>SOLUTION: The terminal box device for use in the solar battery module has a box console 40B mounted on the solar battery module 80 in which a plurality of solar battery cells are arranged and the belt-like tab line 28 electrically connecting the plurality of solar battery cells extends in the direction of the solar battery cell array, and a terminal strip 30 accommodated in the box console 40B and having the tab line 28 drawn out of the connected module 80. The device includes a curve slope guide (second guiding part) 48 for guiding the tip of the tab line 28 to a tab line connection part 32 of the terminal strip 30 by guiding and positioning the tip of the tab line 28 in a direction orthogonal to a principal plane of the tab line 28. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a solar cell module terminal box device used for a solar cell module disposed on a roof of a house or the like.

  The photovoltaic power generation system supplies a direct current from a solar cell module laid on the roof of a house to each electrical appliance via an inverter or the like. A solar cell module consists of a plurality of solar cell modules, and has a structure in which the electrodes of each solar cell module are connected in series via a terminal box.

  As a conventional terminal box, one end is connected to a tab wire (lead) that is arranged in parallel on a substrate inside the box body and is drawn from the back side of the solar cell module, and the other end is connected to a module connecting cable. One having a plurality of terminal boards and a reverse-flow bypass diode bridged between the terminal boards is known.

  In such a terminal box, connection work such as solder welding must be performed while maintaining the state in which the tip of the lead is bent and brought into contact with the terminal plate, and therefore, it is necessary to suppress the looseness of the lead during the connection work. There was a problem that it was difficult to work.

  On the other hand, for example, in Patent Document 1, prior to solder welding with the tip of the lead, the tip of the lead is inserted into the terminal plate from the lead insertion opening that opens at the tip edge and temporarily held. It has been proposed to provide a temporary holding groove for holding.

  According to the proposal disclosed in the above-mentioned Patent Document 1, the tip end portion of the lead is inserted from the lead insertion port of the terminal plate toward the temporary holding groove and temporarily held, and connection work such as solder welding is performed from the temporarily held state. As a result, it is possible to suppress the movement of the lead during the connection work, and the workability is improved.

JP 2006-5098 A

  However, in the proposal of Embodiment 1 of Patent Document 1, for example, the lead insertion port and the temporary holding groove are formed in the extending direction of the tab wire (lead) of the solar cell module, so the lead is temporarily held. When inserting into the groove, the lead must be twisted by 90 ° and then bent and moved toward the temporary holding groove. Therefore, stress is applied to the curved portion of the lead, and the lead drags an adhesive for fixing the terminal box, which is not a preferable state.

  Therefore, in Patent Document 1, as the second embodiment, a further improved proposal is made that the lead insertion port and the temporary holding groove are formed in a direction perpendicular to the extending direction of the tab wire (lead). ing. According to this proposal, the lead can be translated toward the temporary holding groove as it is without twisting the tip of the lead.

  However, in the method according to the first embodiment and the method according to the second embodiment of the above-mentioned Patent Document 1, finally, the strip-shaped lead is slid in a plane parallel to the main surface thereof to the temporary holding groove. Must move towards. Therefore, the stress acting on the curved portion of the lead and the operation of dragging the adhesive by the lead are not completely eliminated.

  This invention is made in view of the above, Comprising: When guide | inducing the strip-shaped tab wire pulled out from the solar cell module to the connection part provided in the terminal board, the operation | movement which a tab wire drags an adhesive agent further It aims at obtaining the terminal box apparatus for solar cell modules which can make the stress concerning a tab wire extremely small while reducing.

  In order to solve the above-described problems and achieve the object, the solar cell module terminal box device of the present invention has a plurality of solar cells arranged and strip-shaped tab wires that electrically connect the solar cells. A box housing attached to the solar cell module extending in the arrangement direction of the solar cells, and a terminal plate that is accommodated in the box housing and connected to the tab wire drawn from the solar cell module; A guide portion is provided that guides the tip portion of the tab wire to the connection portion of the terminal board by guiding and positioning the tip portion in a direction orthogonal to the main surface of the tab wire.

  According to this invention, when the strip-shaped tab wire drawn out from the solar cell module is guided to the connecting portion provided on the terminal plate, the bending direction of the strip-shaped tab wire is in a plane perpendicular to the main surface, that is, The curved direction of the strip-shaped tab line that is guided and deformed becomes the direction of rounding without twisting the band, further reducing the action of the tab line dragging the adhesive, and extremely reducing the stress acting on the curved portion of the tab line Can be small.

  Embodiments of a solar cell module according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view showing a solar cell module to which a solar cell module terminal box device according to Embodiment 1 of the present invention is applied. FIG. 2 is a perspective view of the solar cell module on which the solar cell module terminal box device according to Embodiment 1 of the present invention is disposed as viewed from the back side. 3 is a schematic plan view showing a terminal box device for a solar cell module according to Embodiment 1 of the present invention. FIG. 4 is a diagram illustrating a state in which the first terminal board is viewed from the front and a state viewed from the side. FIG. 5 is a cross-sectional view of the solar cell module terminal box device and the solar cell module at the position of line AA in FIG. 4.

  In FIG. 1, a solar cell module 80 includes a solar cell panel 70 formed by resin-sealing a plurality of solar cells 60, and a frame 10 that surrounds the outer edge of the solar cell panel 70 over the entire circumference. ing. The plurality of solar cells 60 are electrically connected by strip-shaped tab wires (not shown) extending in the arrangement direction of the solar cells 60. The solar battery panel 70 has a transparent substrate (glass) (not shown) disposed on the light receiving surface side, and a plurality of solar cells 60 connected in series are arranged side by side on the back surface side of the transparent substrate. 60 is sealed with a resin such as EVA (ethylene vinyl acetate) or an electrically insulating material such as PET (polyethylene terephthalate).

  In FIG. 2, the terminal box device 50 is mounted on the back surface of the solar cell module 80. In the solar cell module 80, one of the module connection cables 51 drawn from the terminal box device 50 mounted on the back surface of the solar cell module 80 can be connected to the other of the module connection cables 51 of the other solar cell module 80. It is possible to sequentially connect the solar cell modules 80 provided on the roof or the like in series. The solar cell system is configured by connecting the module connecting cables 51 and electrically connecting these solar cell modules 80. Then, the solar cell modules 80 connected in series are connected to an inverter (not shown), and the electric power of each solar cell module 80 is converted into an alternating current and taken out.

  Next, the configuration of the terminal box device 50 will be described with reference to FIGS. 3 and 4. In FIG. 3, the terminal box device 50 includes a box housing 40 </ b> A manufactured by molding with synthetic resin. The box housing 40A includes a housing main body 41A having a rectangular case structure having recesses for accommodating the first to third terminal plates 30A, 30B, and 30C and having an open top, and the housing main body 41A. And a lid 42 (FIG. 5) attached so as to close the upper opening. A wiring hole 41a is opened along one side edge (upper edge in FIG. 3) of the bottom surface of the housing body 41A.

  In FIG. 4, the first terminal plate 30A is formed by press-molding a metal plate, and a mounting hole 31 is formed at the center. At one end of the first terminal board 30A, a tab wire connecting portion (connecting portion) 32 is formed as a slit-like hole to which the tab wire 28A extending from the solar cell module 80 is connected. In the present embodiment, an arcuate guide portion, which is a first guiding portion, is provided around the tab line connecting portion 32 on the bottom surface side (solar cell module 80 side, back surface side) of the first terminal board 30A. 38 is provided. The arcuate guide portion 38 is formed at the same time when the metal plate is press-formed, and both sides sandwiching the slit-shaped tab wire connection portion 32 are formed by being curved and molded into a semicircular shape with a convex cross section on the back side. Has been. In other words, a mountain having a semicircular cross section is formed on both sides of the slit-like tab wire connection portion 32. The curved surfaces facing each other across the tab line connecting portion 32 of the arc-shaped guide portion 38 guide the tab line 28A to the tab line connecting portion 32 and are parallel to the main surface of the tab line 28A (inclined). Guide surfaces) 38a, 38a. On the other hand, the other end of the first terminal plate 30A is provided with a connection cable connection portion 33 to which the module connection cable 51 is connected. The second terminal plate 30B and the third terminal plate 30C have substantially the same configuration as that of the first terminal plate 30A except for the connecting cable connecting portion 33.

  Returning to FIG. 3, the first to third terminal boards 30A, 30B, 30C are fixed in the housing main body 41A by engaging the mounting holes 31 formed in the center with the mounting protrusions 43 of the housing main body 41A. ing. The first to third terminal plates 30A, 30B, and 30C are arranged and fixed in parallel with a predetermined interval in the recess of the housing body 41A so that one end side (tab wire connection portion 32) faces the wiring hole 41a. ing. Band-shaped tab wires 28A, 28B, and 28C extending from the solar cell module 80 are soldered to the tab wire connecting portions 32 of the first to third terminal plates 30A, 30B, and 30C, respectively. The module connection cable 51 is crimped and connected to the connection cable connecting portion 33 at the other end of the first terminal board 30A.

  A procedure for soldering the tab wire 28A to the first terminal board 30A will be described with reference to FIG. Here, the connection between the first terminal board 30A and the tab wire 28A will be described, but the same applies to the second terminal board 30B and the third terminal board 30C. First, the box housing 40 </ b> A is bonded to the back surface of the laminated body that constitutes the solar cell panel 70 after the lamination process by the adhesive 81. The laminated body constituting the solar battery panel 70 includes a glass layer 21 made of transparent glass and a tab wire 28A for electrically connecting a solar battery cell (not shown) adjacent to the solar battery cell from the light receiving surface side, such as EVA. The cell arrangement layer 23 that is resin-sealed and the backsheet layer 25 that is made of PET, PVF (polyvinyl fluoride), or the like and that has excellent weather resistance are laminated in this order. When the box housing 40 </ b> A is bonded, the strip-shaped tab wire 28 </ b> A extending from the solar cell module 80 is inserted into the slit-shaped tab wire connecting portion 32.

  The tab wire 28A is very flexible. Therefore, in the conventional terminal board in which the arcuate guide portion 38 is not provided, when the tip end of the tab wire 28A is inserted into the slit-like tab wire connecting portion 32, the tab wire 28A is loose and not easy. In the present embodiment, when the leading end of the tab wire 28A is inserted between the arcuate guide surfaces 38a and 38a, the tab line 28A advances along one of the two arcuate guide surfaces 38a and 38a, and smoothly slits. Is inserted into the tab-line connecting portion 32. At this time, the strip-shaped tab line 28A is guided by arcuate guide surfaces 38a, 38a parallel to the main surface, and the direction of movement by this guide is a direction orthogonal to the main surface. As a result, the bending direction of the strip-shaped tab line 28A is in a plane orthogonal to the main surface, that is, the bending direction of the strip-shaped tab line 28A that is guided and deformed becomes the direction of rolling without twisting the strip, and the tab line 28A Can reduce the action of dragging the adhesive, and the stress acting on the curved portion of the tab wire 28A can be extremely reduced. In this way, after the tab line 28A is inserted into the tab line connecting portion 32, the tab line 28A is entangled with the tab line connecting portion 32 as necessary, and in this state, the tab line connecting portion 32 and the tab line 28A are connected. Are soldered together.

  In the solar cell module terminal box device having such a configuration, the tab wires 28A, 28B, 28C drawn from the solar cell module 80 are slit-like provided on the first to third terminal plates 30A, 30B, 30C. When the tab-line connecting portion 32 is guided, the bending direction of the strip-shaped tab line is in a plane perpendicular to the main surface, that is, the bending direction of the strip-shaped tab line is the direction of rolling without twisting the strip. The lines 28A, 28B, and 28C can reduce the action of dragging the adhesive 81, and the stress acting on the curved portion of the tab line can be extremely reduced.

Embodiment 2. FIG.
FIG. 6 is a schematic plan view of a housing body showing a solar cell module terminal box device according to Embodiment 2 of the present invention. 7 is a cross-sectional view of the box housing according to the second embodiment at the position of line BB in FIG. FIG. 8 is a cross-sectional view of the terminal box device for a solar cell module and the solar cell module at the position of line BB in FIG. In the solar cell module terminal box device of the present embodiment, the terminal plate 30 is the same as the conventional one. In other words, nothing is provided around the slit-like tab wire connection portion 32 at the end of the terminal plate 30, and the shape is such that a slit is simply formed on the flat plate (FIG. 8). ).

  In the present embodiment, the curved main body 41B constituting the box housing 40B is formed with a curved inclination guide portion 48 that is a second guiding portion for guiding the tab wire 28. A curved inclination guide portion 48 is formed at a position corresponding to the tab line connection portion 32 on the bottom surface of the housing main body 41B. The curved inclination guide portion 48 is formed at the same time as the casing main body 41B is molded. The curved inclined guide part 48 has a slit-like through hole 48b at a position overlapping the tab wire connecting part 32 of the terminal board 30, and from the large-diameter introduction opening 48a formed on the bottom surface toward the through hole 48b. It has a pair of curved inclined guide surfaces (inclined guide surfaces) 48c, 48c that gradually narrow the interval. The pair of curved inclined guide surfaces 48c, 48c are curved surfaces that are parallel to the main surface of the tab line, and are continuous from the introduction opening 48a toward the through hole 48b and have a convex cross section of ¼ circle. It consists of a curved surface.

  A procedure for soldering the tab wire 28 to the terminal board 30 will be described with reference to FIG. In FIG. 8, the main parts of the second terminal plate and the third terminal plate are the same as those of the terminal plate 30, so that the terminal plate 30 and the tab wire 28 will be described as representative. The strip-shaped tab line 28 extending from the solar cell module 80 is very flexible. Therefore, when the end of the band-shaped tab line 28 is inserted between the curved inclined guide surfaces 48c, 48c, the tab line 28 is curved and inclined guide surface parallel to the main surface. Guided by 48 c and 48, it is smoothly inserted into the slit-like tab wire connecting portion 32 of the terminal board 30.

  In the solar cell module terminal box device having such a configuration, when the tab wire 28 drawn out from the solar cell module 80 is guided to the slit-like tab wire connecting portion 32 provided on the terminal plate 30, a strip shape is formed. The bending direction of the tab line is in a plane perpendicular to the main surface, and the tab line 28 can reduce the operation of dragging the adhesive 81, and the stress acting on the curved part of the tab line can be extremely reduced.

  In addition, it is good also as an embodiment which has both the induction | guidance | derivation parts of the circular-arc-shaped guide part 38 (1st guide part) of Embodiment 1, and the curve inclination guide part 48 (2nd guide part). According to this configuration, the tab line can be smoothly inserted into the tab line connecting part due to the synergistic effect of the two guiding parts.

  As described above, the present invention is useful for a solar cell module terminal box device used for a solar cell module disposed on a roof of a house, and in particular, a plurality of solar cells are arranged. This is suitable for a solar cell module terminal box device equipped in a solar cell module in which strip-like tab wires for electrically connecting a plurality of solar cells extend in the arrangement direction of the solar cells.

It is a perspective view which shows the solar cell module to which the terminal box apparatus for solar cell modules which concerns on Embodiment 1 of this invention is applied. It is the perspective view which looked at the solar cell module by which the terminal box apparatus for solar cell modules which concerns on Embodiment 1 of this invention is arrange | positioned from the back surface side. It is a schematic plan view which shows the terminal box apparatus for solar cell modules which concerns on Embodiment 1 of this invention. It is a figure which combines and shows a mode that the 1st terminal board was seen from the front, and the mode seen from the side surface. It is sectional drawing in the position of the AA line of FIG. 4 of the terminal box apparatus for solar cell modules and a solar cell module. It is a schematic plan view of a housing body showing a terminal box device for a solar cell module according to Embodiment 2 of the present invention. It is sectional drawing in the position of the BB line of FIG. 6 of the box housing | casing of Embodiment 2 of this invention. It is sectional drawing in the position of the BB line of FIG. 6 of the terminal box apparatus for solar cell modules and a solar cell module.

Explanation of symbols

10 Frame 21 Glass layer 23 Cell arrangement layer 25 Back sheet layer 28, 28A, 28B, 28C Tab wire (lead)
30, 30A, 30B, 30C Terminal plate 31 Mounting hole of terminal plate 32 Slit-shaped tab wire connecting portion 33 Connecting cable connecting portion 38 Arc-shaped guide portion (first guide portion)
38a Circular guide surface (inclined guide surface)
40A, 40B Box housing 41A, 41B Housing body 43 Mounting protrusion 48 Curved inclination guide part (second guiding part)
48a Introduction opening 48b Through hole 48c Curved inclined guide surface (inclined guide surface)
50 Terminal Box Device 51 Module Connection Cable 60 Solar Cell 70 Solar Panel 80 Solar Cell Module 81 Adhesive

Claims (6)

A box housing in which a plurality of solar cells are arranged, and a strip-shaped tab wire that electrically connects the plurality of solar cells is attached to a solar cell module extending in the arrangement direction of the solar cells, and the box housing In a terminal box device for a solar cell module having a terminal plate that is housed in the body and connected to the tab wire drawn out from the solar cell module,
A guide portion is provided for guiding the tip portion of the tab wire to the connection portion of the terminal board by guiding and positioning the tip portion of the tab wire in a direction perpendicular to the main surface of the tab wire. A terminal box device for a solar cell module.   The guide part is formed around the connection part of the terminal board, and has a pair of inclined guide surfaces parallel to the main surface of the tab line, which gradually narrows the distance toward the connection part. The terminal box device for a solar cell module according to claim 1, comprising a portion. The guide portion is formed at a position corresponding to the connection portion of the terminal plate of the box housing, and the opening gradually opens at a position overlapping the connection portion, and the interval is gradually narrowed toward the through hole. The solar cell module terminal box device according to claim 1, further comprising: a second guide portion having a pair of inclined guide surfaces parallel to the main surface of the tab line. 4. The terminal box device for a solar cell module according to claim 2, wherein the pair of inclined guide surfaces are arc-shaped surfaces that are convex inwardly. 5. The terminal box device for a solar cell module according to claim 2, wherein the terminal plate is produced by press forming a metal plate, and the pair of inclined guide surfaces are formed simultaneously with the press forming. . 4. The solar cell module terminal box device according to claim 3, wherein the box housing is manufactured by resin molding, and the pair of inclined guide surfaces are formed simultaneously with the molding. 5. .

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