JP4687067B2 - Solar cell module and power lead wire connection method - Google Patents

Description

  The present invention relates to a solar cell module and a power lead wire connecting method, and more particularly, a solar cell module and a power lead wire integrally sealed with a light receiving surface side protective layer, a non-light receiving surface side protective layer, a solar cell, and a back reinforcing plate. It relates to the connection method.

  Currently, clean energy research and development is underway from the standpoint of environmental protection. Among them, solar cells are attracting attention because their resources (sunlight) are infinite and pollution-free.

  A typical example of a solar cell (photoelectric conversion device) in which a plurality of solar cell elements formed on the same substrate are connected in series is a thin film solar cell. Thin-film solar cells are expected to become the mainstream of solar cells in the future because they are thin and lightweight, inexpensive to manufacture, and easy to increase in area, and are attached to building roofs and windows in addition to power supply. Demand is also expanding for business use and general residential use. Conventional thin-film solar cells have used glass substrates, but in recent years, research and development of flexible solar cells using plastic films that are excellent in lightness, ease of construction, and mass productivity have been promoted. Utilizing this flexibility, mass production became possible by the roll-to-roll manufacturing method.

  As the above thin film solar cell module, in order to seal the solar cell formed on the electrically insulating film substrate with an electrically insulating protective material, the light receiving surface side and the non-light receiving surface side of the solar cell What provided the protective layer in both is known. Since the protective material of the solar cell module is plastic, the strength against twisting and pulling force is weak, and there is a risk that the solar cell module may be damaged by external force during construction. Therefore, a structure in which a reinforcing plate is provided on the entire back surface of the solar cell module has been developed.

  In addition, as a solar cell module structure that is easy to install and reduces costs, a solar cell module in which protective layers are provided on both the light-receiving surface side and the non-light-receiving surface side of the solar cell. Has been proposed in which a non-power generation area is formed and a mounting hole for installing a solar cell module is provided in the non-power generation area.

A conventional solar cell module structure will be described.
FIG. 11 is a cross-sectional view showing the vicinity of a terminal block of a conventional solar cell module, and FIG. 12 is an internal perspective view of the conventional solar cell module. Here, FIG. 11 shows the structure of a conventional solar cell module. FIG. 12 shows the inside of the terminal block in detail, and shows an example of a conventional method for connecting the internal lead wire, which is the power lead wire of the solar cell module, and the cable in the terminal block.

  Glass fiber is filled in adhesive layer 2 using EVA (Ethylene Vinyl Acetate) etc., moisture barrier 3 using ETFE (Etylene-tetrafluoroethylene), etc. Then, a light-receiving surface side protective layer 6 as a weather-resistant protective layer comprising a reinforcing layer 4 having increased mechanical strength and a surface protective layer 5 for preventing adhesion of pollutants using ETFE or the like is laminated on the solar cell 1. Is protecting.

  In addition, on the non-light-receiving surface side opposite to the sunlight incident side, an EVA serving as a joint with the adhesive layer 7, the insulating layer 8 using ETFE or polyimide that serves both as waterproof and electrical insulation, and the back surface reinforcing plate 11. A non-light-receiving surface side protective layer 10 is formed by laminating an adhesive layer 9 using a metal, etc., and a back reinforcing plate 11 using a metal flat plate laminated under the adhesive layer 9 is bonded thereto. Integrated with heat-sealing laminate.

  The solar cell 1 used in this configuration can be either crystalline or amorphous, but a thin-film substrate type amorphous solar cell is particularly desirable. In addition, although lamination | stacking of each layer is generally performed toward the downward direction in order from the surface protective layer 5, the solar cell 1 and the contact bonding layer 2 are integrated previously. Moreover, some layers can be omitted according to needs.

  Furthermore, the light-receiving surface side protective layer 6, the non-light-receiving surface side protective layer 10, and the back reinforcing plate 11 are extended to the non-power generation region on the side of the solar cell 1, and both sides of the substantially rectangular solar cell 1 are formed in the non-power generation region. An internal lead wire 12 of a flat foil copper wire is arranged in parallel along the side, and is connected to a positive pole or a negative pole (not shown).

  Further, in the vicinity of the end portion of the internal lead wire 12, a terminal block 14 that relays the generated power to the outside is fixed to the back reinforcing plate 11 with an adhesive 20, and the internal lead wire 12 and the cable 15 are electrically connected. Thus, the solar cell module 13 is formed in a rectangular and flat plate shape as a whole.

  Further, the internal lead wire 12 is subjected to the laminating process described above after passing through the holes 21 formed in the back surface reinforcing plate 11, the adhesive layer 9, the insulating layer 8, and the adhesive layer 7, and is exposed on the back surface reinforcing plate 11 after the lamination. Is done. At this time, the hole 21 formed in the back reinforcing plate 11 is processed to a size that does not contact the internal lead wire 12 for the purpose of insulation. Further, the terminal block 14 is disposed in contact with the back reinforcing plate 11 so that the holes 22 of the terminal block 14 are arranged on the hole 21 substantially coaxially, and is bonded and fixed to the back reinforcing plate 11.

  Furthermore, the internal lead wire 12 is joined to the crimp terminal 17 through the hole 22 of the terminal block 14 by soldering (other connection methods will be described with reference to FIG. 13). The crimping terminal 17 is joined by caulking and joining the copper wire part 26 of the cable 15 inserted from the outside of the terminal block 14 into the crimping part 25 of the crimping terminal 17. Used, it is fixed inside the terminal block 14 by a fixing member 19 such as screwing or heat welding. When it is necessary to insert a backflow prevention diode (not shown) on either the positive pole side or the negative pole side, the diode is inserted and fixed between the internal lead wire 12 and the crimp terminal 17. In addition, the hole 21, hole 22, and the inside of the terminal block 14 are filled with a waterproof / insulating resin so as to eliminate insulation failure due to moisture intrusion, and the terminal block lid 18 is covered with the terminal block 14 for adhesion or fitting. Alternatively, the terminal block 14 is formed by fastening with screws (not shown).

FIG. 13 is an internal perspective view of a conventional solar cell module, and is a diagram illustrating an example of a conventional method for connecting an internal lead wire of a solar cell module and a cable in a terminal block.
The internal lead wire 12 that has reached the inside of the terminal block 14 through the hole 21 of the solar cell module 13 and the hole 22 of the terminal block 14 is attached with a crimping terminal 28 for fastening at the end thereof. The cable 15 inserted from the outside of the terminal block 14 has its copper wire portion 30 inserted into the other fastening crimping terminal 28 and attached by caulking. The fastening crimping terminal 28 attached to the copper wire portion 30 of the cable 15 is inserted into the terminal block 14 after being attached to the cable 15, and the joined portion between the cable 15 and the terminal block 14 is inserted by ultrasonic bonding or the like after insertion. Joined while sealed. The fastening crimping terminal 28 on the inner lead wire 12 side and the fastening crimping terminal 28 on the cable 15 side, which are respectively attached by caulking, are connected in the terminal block 14 by a fastening hole (not shown) and a fastening body 31 in the terminal block 14. It is intended to be connected and fixed.

  FIG. 14 is a conventional solar cell module installation diagram, showing an example of a method for installing a conventional solar cell module on a roof or the like. The solar cell module 13 is molded at both ends in the width direction by a roll molding machine after the terminal block 14 is attached. This molded solar cell module 13 has a waterproof sheet 32 provided to protect the base plate 33, which is the foundation of the roofing material, from rainwater that has infiltrated the back surface, and bolts, screws, It is fixed directly by fitting or using an installation member. In addition, the molded solar cell modules 13 are continuously arranged by hooking the molded parts to each other. The cable 15 connected to the terminal block 14 is electrically connected in series and parallel with another adjacent solar cell module 13 and connected to an inverter (not shown).

  In such a solar cell module, it is required to facilitate the installation and wiring work of the solar cell module, and a structure in which a concave groove for arranging the electrode terminal of the solar cell module is provided in the panel body is proposed. (For example, see Patent Document 1).

Further, in order to draw out the power lead wire from the solar cell module, a method has been proposed in which a lead portion is provided in a part of the internal lead wire and the internal lead wire and the external lead wire connecting member are caulked and connected by the lead portion. (For example, patent document 2).
JP 2001-49802 (paragraph numbers [0023] to [0026], FIG. 3) JP 2001-274440 A (paragraph numbers [0035] to [0041], FIG. 1)

However, regarding the connection between the internal lead wire of the solar cell module described above and the cable in the terminal block, there are the following problems.
The conventional method for connecting the internal lead wire and the cable in the terminal block is as follows. 1. Welding and joining method by solder, A typical example is a method of fastening with a fastening body such as a fastening crimp terminal and a screw. 1. In the welding and joining method using solder, a soldering iron and solder are prepared at the time of joining, and after heating the soldering iron, working time and tools and parts for joining by soldering are required. In addition, joining with a soldering iron requires a certain level of skill, and when an unskilled worker performs it, there is a risk that the solder will not adhere well and defective products such as poor connections will be produced. 2. In the connection method using a fastening terminal and a fastening body, a fastening terminal such as a crimping terminal, a crimping tool, and a screw and a fastening body tool such as a screwdriver are prepared at the time of joining, and the fastening crimping terminal is attached to an internal lead wire. Caulking, working time and tools and parts for fastening the cable and the crimping crimping terminal that has been crimped in advance with a fastening body such as a screw are required.

  Although these methods are functionally satisfactory, there are problems such as the need for tools for connection, long working hours, and an increase in the number of parts. It is a problem in a costly method.

  In addition, the structure in which a concave groove for arranging the electrode terminal of the solar cell module is provided in the panel body does not solve the problem that a work tool represented by a screw is required to connect the internal lead wire and the external terminal. . Furthermore, in the method in which a lead portion is provided in a part of the internal lead wire and the internal lead wire and the external lead wire connecting member are caulked and connected by the lead portion, a work tool is required, and once it is caulked, the operation can be performed again. There is a problem that it is not possible.

  This invention is made | formed in view of such a point, In the connection method of the internal lead wire of a solar cell module, and the cable in a terminal block, 1. 1. Reduce work time, 2. Do not use work tools; An object of the present invention is to devise an improvement measure such as reducing the number of parts and to provide a low-cost solar cell module and a method for connecting power leads.

  In the present invention, in order to solve the above-described problem, in the solar cell module integrally sealed with the light-receiving surface side protective layer, the non-light-receiving surface side protective layer, the solar cell, and the back reinforcing plate, the solar cell module generates power. Connected to a power lead wire for taking out the generated power to the outside, an insertion groove for sandwiching the power lead wire drawn from the solar cell module through a hole made in the back reinforcing plate, and a cable for taking out the power to the outside. An insertion-type terminal having a bent portion inserted into the insertion groove, and a terminal block fixed to a non-light-receiving surface side of the back reinforcing plate, the power lead wire being inserted into the insertion groove and the insertion Provided is a solar cell module that is sandwiched between mold terminals, fixes the power lead wire in the insertion groove, and electrically connects the power lead wire and the insertion type terminal. It is.

  According to such a solar cell module, the power lead wire for taking out the electric power generated inside the solar cell module is electrically connected to the cable at the terminal block fixed to the non-light-receiving surface side of the back reinforcing plate. , Send power to the outside through the cable. The terminal block includes an insertion groove for sandwiching the power lead wire and an insertion type terminal having a bent portion inserted into the insertion groove, which is a terminal electrically connected to the cable. The power lead wire is sandwiched between the insertion groove and the insertion type terminal and fixed in the insertion groove, and is electrically connected to the insertion type terminal.

  Further, in order to solve the above problems, in the method of connecting the power lead wires of the solar cell module integrally sealed with the light receiving surface side protective layer, the non-light receiving surface side protective layer, the solar cell, and the back reinforcing plate, A power lead wire for taking out the electric power generated by the solar cell module to the outside is drawn into a terminal block fixed to the non-light-receiving surface side of the back surface reinforcing plate through a hole made in the back surface reinforcing plate, and provided in the terminal block The power lead wire is inserted between an insertion groove for sandwiching the power lead wire formed and an insertion type terminal having a bent portion connected to a cable for taking out the electric power to the outside, and inserting the power lead wire. Inserting and bending the power lead wire between the insertion groove and the insertion type terminal by inserting a bent portion of the type terminal into the insertion groove, and electrically connecting the insertion type terminal. Power lead wire connection method of a solar cell module according to symptoms, is provided.

  According to such a power lead wire connecting method of the solar cell module, the back surface reinforcing plate is used to connect the power lead wire for taking out the power generated inside the solar cell module and the power lead wire for taking out the power to the outside. It is pulled in through a hole made in the back reinforcing plate in the terminal block fixed to the non-light receiving surface side. In the terminal block, there are provided an insertion groove for sandwiching the power lead wire and an insertion type terminal having a bent portion which is electrically connected to the cable and inserted into the insertion groove. After the power lead wire drawn into the terminal block is positioned between the insertion groove and the insertion type terminal, the insertion lead terminal is inserted into the insertion groove, so that the power lead wire is inserted between the insertion groove and the insertion type terminal. Sandwich. Thereby, a power lead wire and a cable are electrically connected via an insertion type terminal.

  According to the present invention, the electric power generated by the solar cell on the light receiving surface side of the solar cell module passes through the hole provided in the back reinforcing plate by the internal lead wire, and is arranged on the non-light receiving surface side of the back reinforcing plate. In the solar cell module that is electrically connected to the terminal block provided, the L-type connected to the insertion groove provided in the terminal block and the cable side in the operation of connecting the internal lead wire and the cable in the terminal block By using the insertion type crimp terminal bent in the shape of the inner lead wire, the internal lead wire and the insertion type crimp terminal are both sandwiched and fixed in the insertion groove and electrically connected. It can be easily connected without using a work tool such as a soldering iron or a fastening driver as in the conventional method. Furthermore, 2. Connection is possible only with the terminal block, internal lead wire, and crimp terminal, which have been conventionally configured, and there is no need for fastening parts such as screws used in the conventional method, and the inside of the terminal block The number of parts can be reduced.

  As a result, it is possible to simplify the work contents of the conventional method, so that the work time is shortened and the cost of the solar cell module can be reduced.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. There are two proposals for this embodiment, which will be described sequentially from the first embodiment. In addition, the description mainly focuses on the internal lead wire, the insertion crimp terminal, and the terminal block structure, which are the main points of the present invention, and the solar cell module constituent layers that are not so much related to the present invention are the conventional technology except for a part. Since it is the same, description is omitted.

[First embodiment]
The first embodiment will be described with reference to FIGS. First, the configuration of the solar cell module according to the first embodiment will be described with reference to FIGS. 1 and 2, and the method of connecting the power leads will be described with reference to FIGS.

  FIG. 1 is a perspective view of the inside of a terminal block according to the first embodiment of the present invention, showing in detail the inside of the terminal block disposed on the back surface reinforcing plate of the solar cell module according to the first embodiment. The power lead wire (hereinafter referred to as the internal lead wire) that takes out the power generated inside the solar cell module to the outside, and the power input through the internal lead wire in the terminal block It is the perspective view which showed a mode that the cable taken out outside was connected. FIG. 2 is a cross-sectional view showing the vicinity of the terminal block of the solar cell module according to the first embodiment of the present invention, and a cross-sectional view showing the solar cell module in which the terminal block shown in FIG. 1 is joined to the back reinforcing plate. It is.

  In FIG. 1 and FIG. 2, the internal lead wire 12 is laminated after passing through the holes 21 provided in the back reinforcing plate 11, the adhesive layer 9, the insulating layer 8, and the adhesive layer 7. 11 is exposed. At this time, the hole 21 provided in the back reinforcing plate 11 is processed to a size that does not contact the internal lead wire 12 for the purpose of insulation. The terminal block 50 is disposed in contact with the back surface reinforcing plate 11 so that the hole 21 provided in the back surface reinforcing plate 11 and the hole 22 of the terminal block 50 are arranged substantially coaxially, and further, one terminal of the internal lead wire 12 is arranged. After the end is inserted through the hole 22 of the terminal block 50 and inserted into the terminal block 50, the end is fixed to the back reinforcing plate 11 with the adhesive 20.

  The insertion-type crimp terminal 54 is crimped and connected by inserting the copper wire portion 26 of the cable 15 inserted in advance from the outside of the terminal block 50 into the crimping portion 55 of the insertion-type crimp terminal 54. The caulking portion 55 indicates that the internal lead wire 12 is sandwiched using the insertion groove 51 of the terminal block 50 and the bending portion 56 of the insertion-type crimp terminal 54. As for the length of the cable 15 from the inner surface of the terminal block 50, the cable 56 is lifted to such an extent that the bent portion 56 of the insertion-type crimp terminal 54 connected to the cable described later is disengaged from the insertion groove 51 formed in the terminal block 50. The length can be bent. Further, the insertion-type crimp terminal 54 is bent at a portion on the opposite side of the crimping portion 55 substantially perpendicularly to the solar cell module 13, and a convex portion 57, which is a convex projection, is formed at the tip of the terminal block 50. It is provided on the inclined portion 53 side. The convex portion 57 includes a method in which the tip of the insertion-type crimp terminal 54 is folded back and a method in which the convex portion is pushed out by a press. In this embodiment, the operation is started from a state in which the insertion type crimp terminal 54 in which the convex portion 57 and the bent portion 56 are formed is crimped to the cable 15 in advance.

  The terminal block 50 has a vertical portion 52 that is a surface perpendicular to the insertion direction of the cable 15 and a tilted surface that extends in the direction of the back reinforcing plate 11 at a position where the bending portion 56 of the insertion-type crimp terminal 54 contacts. An insertion groove 51 composed of an inclined portion 53 is provided. The depth of the insertion groove 51 is set to a depth that can accommodate the thickness of the distal end of the bending portion 56 of the insertion-type crimp terminal 54 and the internal lead wire 12. The entrance width of the insertion groove 51 is set to be equal to or less than the thickness of the bending portion 56 of the insertion-type crimp terminal 54 and the thickness of the internal lead wire 12, and the corner portion of the entrance needs to be rounded so as to be easily inserted. There is. The width of the insertion groove 51 is made longer than the width of the bending portion 56 of the insertion-type crimp terminal 54 or the width of the internal lead wire 12. Further, when considering the bending of the sandwiched portion described later, the width of the raised bottom portion 61 inside the terminal block 50 in which the insertion groove 51 is provided needs not to reach the inner wall 62 inside the terminal block 50. Become. The thickness of the neck portion 60 constituting the hole 22 and the inclined portion 53 of the insertion groove 51 is such that the neck portion 60 corresponding to the inlet of the insertion groove 51 when the distal end of the bending portion 56 of the insertion type crimp terminal 54 and the internal lead wire 12 are sandwiched. In order to increase the strength, an R shape is provided at the inner corner of the inclined portion 53.

  Next, referring to FIG. 3 to FIG. 5, a method for connecting the internal lead wire of the first embodiment and the crimp terminal crimped to the cable in advance will be described in order. FIGS. 3 to 5 are cross-sectional views sequentially showing the method of connecting the internal lead wire and the crimp terminal pre-crimped to the cable according to the first embodiment. FIG. 3 shows step 1 and FIG. Step 2 and FIG. 5 show Step 3. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

[Step 1] After the terminal block 50 is bonded to the solar cell module 13, the internal lead wire 12 that has passed through the hole 22 of the terminal block 50 is raised in the vertical direction (FIG. 3).
[Step 2] The bent portion 56 of the insertion-type crimp terminal 54 of the terminal block 50 in which the cable 15 and the insertion-type crimp terminal 54 are integrated in advance is lifted to a position where it is removed from the insertion groove 51. Then, the internal lead wire 12 is tilted in the direction in which the cable 15 is inserted, and is inserted between the tip of the bending portion 56 of the insertion-type crimp terminal 54 and the inside of the terminal block 50 (FIG. 4).

  [Step 3] By inserting the distal end of the bending portion 56 of the insertion-type crimp terminal 54 into the insertion groove 51 of the terminal block 50, the internal lead wire 12 and the insertion-type crimp terminal 54 are electrically connected. Further, the convex portion 57 of the bending portion 56 of the insertion type crimp terminal 54 and the inclined portion 53 of the insertion groove 51 are in contact with each other with the internal lead wire 12 interposed therebetween, thereby preventing the insertion portion 51 from coming off the insertion groove 51. (FIG. 5).

  The connection method between the internal lead wire 12 and the insertion-type crimp terminal 54 is different from general caulking, but is in electrical contact, but the components are not joined to each other. For this reason, if it is necessary to start again after the internal lead wire 12 and the insertion-type crimp terminal 54 are connected, the contact with the internal lead wire 12 is released by lifting the insertion-type crimp terminal 54 from the insertion groove 51. Can be squeezed again. This is the difference from general caulking.

  In addition, after connecting the internal lead wire 12 and the insertion-type crimp terminal 54, in order to eliminate insulation failure due to moisture intrusion into the holes 21, 22 and the terminal block 50, it is filled with a waterproof / insulating resin, The connection between the internal lead wire 12 and the insertion-type crimp terminal 54 is further strengthened. After the resin filling, the terminal block lid 18 shown in FIG. 2 is put on the terminal block 50, and the terminal block 50 is formed by bonding, fitting, or fastening with a screw (not shown).

[Second Embodiment]
The second embodiment is shown and described in FIGS. In the second embodiment, an insertion portion for positioning and temporarily fixing the internal lead wire in the insertion groove of the first embodiment is provided. First, the configuration of the solar cell module according to the second embodiment will be described with reference to FIGS. 6 and 7, and the method of connecting the power leads will be described with reference to FIGS. 8 to 10.

  FIG. 6 is a perspective view of the interior of the terminal block according to the second embodiment of the present invention, which shows in detail the interior of the terminal block disposed on the back reinforcing plate of the solar cell module according to the second embodiment. It is the perspective view which showed a mode that it connected to the internal lead wire and the cable in a terminal block. FIG. 7 is a cross-sectional view showing the vicinity of the terminal block of the solar cell module according to the second embodiment of the present invention, and a cross-sectional view showing the solar cell module in which the terminal block shown in FIG. 2 is joined to the back reinforcing plate. It is. The same components as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof is omitted.

  6 and 7, the terminal block 70 is disposed in contact with the back surface reinforcing plate 11 so that the hole 21 provided in the back surface reinforcing plate 11 and the hole 22 of the terminal block 70 are arranged substantially coaxially. One end of the internal lead wire 12 is inserted into the terminal block 70 through the hole 22 of the terminal block 70, and then fixed to the back reinforcing plate 11 with the adhesive 20.

  In the same manner as in the first embodiment, the insertion type crimp terminal 54 is connected by inserting the copper wire part 26 of the cable 15 inserted from the outside of the terminal block 70 into the crimping part 55 of the insertion type crimp terminal 54 in advance. Has been. Regarding the length of the cable 15 from the inner surface of the terminal block 70, the cable 56 is lifted to such an extent that the bent portion 56 of the insertion-type crimp terminal 54 connected to the cable described later is removed from the insertion groove 71 formed in the terminal block 70. The length can be bent. Further, the insertion-type crimp terminal 54 is bent at a portion on the opposite side of the crimping portion 55 substantially perpendicularly to the solar cell module 13, and a convex portion 57, which is a convex projection, is inclined at the tip of the terminal block 70. It is provided on the part 73 side. The convex portion 57 includes a method in which the tip of the insertion-type crimp terminal 54 is folded back and a method in which the convex portion is pushed out by a press. In this embodiment, the operation is started from a state in which the insertion type crimp terminal 54 in which the convex portion 57 and the bent portion 56 are formed is crimped to the cable 15 in advance.

  The terminal block 70 has a vertical portion 72 which is a surface perpendicular to the insertion direction of the cable 15 and a later-described insertion portion 74 at the position where the bending portion 56 of the insertion-type crimp terminal 54 contacts, and the insertion direction of the cable 15. After that, an insertion groove 71 composed of an inclined portion 73 having an inclined surface extending in the direction of the back reinforcing plate 11 is provided. The depth of the insertion groove 71 is set to a depth that can accommodate the thicknesses of the distal end of the bending portion 56 of the insertion-type crimp terminal 54 and the internal lead wire 12. The inlet width of the insertion groove 71 (not shown) is set to be equal to or less than the thickness of the bending portion 56 of the insertion-type crimp terminal 54 and the thickness of the internal lead wire 12, and R processing is performed to facilitate insertion at the corner of the inlet. It is necessary to apply. The width of the insertion groove 71 is longer than the width of the tip of the bent portion 56 of the insertion-type crimp terminal 54 or the width of the internal lead wire 12. In addition, in consideration of the bending of the sandwiching portion described later, the width of the raised bottom portion 81 inside the terminal block 70 in which the insertion groove 71 is provided needs not to reach the inner wall 82 inside the terminal block 70. Become. The thickness of the neck portion 80 of the insertion groove 71 is set to a thickness that has a strength that does not allow the sandwiched portion to be slightly damaged when the distal end of the bent portion 56 of the insertion-type crimp terminal 54 and the internal lead wire 12 are sandwiched. In order to increase the strength, an R shape is provided at the inner corner of the. The insertion portion 74 is a square hole that is formed on the inner side surface of the terminal block 70 in the vicinity of the hole 22 in parallel with the insertion direction of the cable 15. The depth of the insertion portion 74 is set to such a length that the internal lead wire 12 bends obliquely when the internal lead wire 12 is fully inserted. The width in the longitudinal direction of the insertion portion 74 is longer than the width of the internal lead wire 12 and is easy to insert. The insertion portion 74 has a width in the thickness direction that is wider than the thickness of the internal lead wire 12 and is easy to insert.

  Next, referring to FIG. 8 to FIG. 10, a method for connecting the internal lead wire and the crimping terminal crimped in advance to the cable according to the second embodiment will be described in order. FIGS. 8 to 10 are cross-sectional views sequentially showing the method of connecting the internal lead wire and the crimp terminal crimped in advance to the cable according to the second embodiment. FIG. 8 shows step 1 and FIG. Step 2 and FIG. 10 show Step 3. 6 and 7 are denoted by the same reference numerals, and description thereof is omitted.

[Step 1] After the terminal block 70 is bonded to the solar cell module 13, the internal lead wire 12 that has passed through the hole 22 of the terminal block 70 is raised in the vertical direction (FIG. 8).
[Step 2] The bent portion 56 of the insertion-type crimp terminal 54 of the terminal block 70 in which the cable 15 and the insertion-type crimp terminal 54 are integrated in advance is lifted to a position where it is removed from the insertion groove 71. Subsequently, the tip of the internal lead wire 12 is inserted from the insertion portion 74 entrance of the terminal block 70 to the back (FIG. 9).

  [Step 3] By inserting the tip of the bent portion 56 of the insertion-type crimp terminal 54 into the insertion groove 71 of the terminal block 70, the internal lead wire 12 and the insertion-type crimp terminal 54 are electrically connected. Further, the convex portion 57 of the bent portion 56 of the insertion-type crimp terminal 54 and the inclined portion 73 of the insertion groove 71 are in contact with each other while sandwiching the internal lead wire 12, thereby preventing the insertion portion 71 from coming off. (FIG. 10).

  The connection method between the internal lead wire 12 and the insertion-type crimp terminal 54 is different from general caulking, but is in electrical contact, but the components are not joined to each other. For this reason, if it is necessary to start again after connecting the internal lead wire 12 and the insertion-type crimp terminal 54, the contact with the internal lead wire 12 is released by lifting the insertion-type crimp terminal 54 from the insertion groove 71. be able to. This is the difference from general caulking. In addition, since the internal lead wire 12 is temporarily fixed to the insertion groove 71 by the insertion portion 74 before crimping, the operation of crimping the internal lead wire 12 with the insertion groove 71 and the insertion-type crimp terminal 54 is further facilitated. Can do.

  After the internal lead wire 12 and the insertion-type crimp terminal 54 are connected, a waterproof / insulating resin is filled in order to eliminate insulation failure due to moisture intrusion into the holes 21, 22 and the terminal block 70, The connection between the internal lead wire 12 and the insertion-type crimp terminal 54 is further strengthened. After filling with the resin, the terminal block lid 18 is put on the terminal block 70 as shown in FIG. 7, and the terminal block 70 is formed by bonding, fitting, or fastening with screws (not shown).

It is a terminal block internal perspective view of the 1st Embodiment of this invention. It is sectional drawing which showed the terminal block vicinity of the solar cell module of the 1st Embodiment of this invention. It is sectional drawing of step 1 which connects the internal lead wire and crimp terminal of the 1st Embodiment of this invention. It is sectional drawing of step 2 which connects the internal lead wire and crimp terminal of the 1st Embodiment of this invention. It is sectional drawing of step 3 which connects the internal lead wire and crimp terminal of the 1st Embodiment of this invention. It is a terminal block internal perspective view of the 2nd Embodiment of this invention. It is sectional drawing which showed the terminal block vicinity of the solar cell module of the 2nd Embodiment of this invention. It is sectional drawing of step 1 which connects the internal lead wire and crimp terminal of the 2nd Embodiment of this invention. It is sectional drawing of step 2 which connects the internal lead wire and crimp terminal of the 2nd Embodiment of this invention. It is sectional drawing of step 3 which connects the internal lead wire and crimp terminal of the 2nd Embodiment of this invention. It is sectional drawing which showed the terminal block vicinity of the conventional solar cell module. It is an internal perspective view of the conventional solar cell module. It is an internal perspective view of the conventional solar cell module. It is the conventional solar cell module installation figure.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Solar cell 11 Back surface reinforcement board 12 Internal lead wire 13 Solar cell module 50 Terminal block 51 Insertion groove 52 Vertical part 53 Inclination part 54 Insertion type crimp terminal 55 Caulking part 56 Bending part 57 Protrusion part 70 Terminal block 71 Insertion groove 72 Vertical part 73 Inclined part 74 Insertion part

Claims (6)

In the solar cell module integrally sealed with the light-receiving surface side protective layer, the non-light-receiving surface side protective layer, the solar cell, and the back reinforcing plate,
A power lead wire for extracting the power generated by the solar cell module to the outside;
An insertion groove for sandwiching the power lead wire drawn out from the solar cell module through a hole made in the back reinforcing plate, and a bent portion connected to a cable for taking out the power to the outside and inserted into the insertion groove A terminal block provided with an insertion type terminal and fixed to the non-light-receiving surface side of the back reinforcing plate;
The power lead wire is sandwiched between the insertion groove and the insertion type terminal, the power lead wire is fixed to the insertion groove, and the power lead wire and the insertion type terminal are electrically connected. A solar cell module characterized by.   2. The insertion type terminal of the terminal block has an L-shape in which the bent portion inserted into the insertion groove is bent in a direction perpendicular to a connection portion with the cable. The solar cell module described.   The insertion groove of the terminal block forms a vertical surface with respect to the insertion direction of the cable, one side of which is installed in a horizontal direction with respect to the back reinforcing plate, and one side in a direction opposite to the vertical surface is the insertion groove The solar cell module according to claim 1, further comprising a shape that forms an inclined surface that extends from the opening to the bottom.   4. The insertion type terminal of the terminal block is provided with a convex portion which is a convex projection at the tip of the bent portion on the side facing the inclined surface when inserted into the insertion groove. Solar cell module.   Before inserting and fixing the power lead wire and the insertion-type terminal, the power lead wire is positioned with respect to the insertion direction of the power lead wire to be temporarily fixed in the insertion groove. The solar cell module according to claim 1, wherein the solar cell module is provided in a vertical direction. In the method of connecting the power leads of the solar cell module integrally sealed with the light-receiving surface side protective layer, the non-light-receiving surface side protective layer, the solar cell, and the back reinforcing plate,
A power lead wire for taking out the electric power generated by the solar cell module to the outside is drawn into a terminal block fixed to the non-light-receiving surface side of the back reinforcing plate through a hole made in the back reinforcing plate,
The power lead wire between an insertion groove sandwiching the power lead wire provided on the terminal block and an insertion type terminal connected to a cable for taking out the power to the outside and having a bent portion inserted into the insertion groove. Insert
By inserting the bending portion of the insertion type terminal into the insertion groove, the power lead is sandwiched and fixed between the insertion groove and the insertion type terminal, and is electrically connected to the insertion type terminal.
A method for connecting power leads to a solar cell module.

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