JP5134211B2 - Terminal box for solar cell module, method for attaching the terminal box, and solar cell system manufactured by the method - Google Patents

Description

  The present invention relates to a terminal box used for extracting power from a solar cell module and a solar cell system incorporating the terminal box.

The conventional terminal box employs a structure that is divided into two parts: (1) a board incorporating a terminal board and (2) an integral part of the peripheral wall and lid, and the terminal box is assembled after the terminal box is assembled to the solar cell module. Some of them do not require filling of the resin inside. (For example, refer to Patent Document 1).
JP 2004-63651 A

  The above-described conventional terminal box requires separate components such as a substrate and a peripheral wall, which increases the cost of creating the terminal box, and requires a multi-step assembly process for the solar cell module. To do. In addition, there remains anxiety in securing the watertightness of the adhesion portion between the terminal box and the solar cell module and / or the external connection cable extraction portion in the terminal box. Furthermore, the solar cell system incorporating the above-described conventional terminal box remains uneasy about the durability and reliability of the system over a long period of time.

  Therefore, an object of the present invention is to obtain a terminal box that can further reduce the cost of creating a terminal box and can reduce and simplify the assembly process to the solar cell module. Moreover, this invention makes it a subject to obtain the terminal box which can prevent further the penetration | invasion of the water into a terminal board.

  Moreover, this invention makes it a subject to obtain the attachment method of the terminal box which implement | achieves the reduction and simplification of the assembly | attachment process to a solar cell module using the terminal box which further reduced the production cost. Moreover, this invention makes it a subject to obtain the attachment method of the terminal box to a solar cell module which makes it possible to prevent further the penetration | invasion of the water into a terminal board.

  Furthermore, an object of the present invention is to obtain a solar cell system in which the production cost is further reduced and durability and reliability over a long period of time are further improved.

  Other problems of the present invention will become apparent from the description of the present invention.

The inventors of the present invention
(1) Connect the output cable of the solar cell module to the terminal board of the terminal box,
(2) Invert the terminal box and attach it to the solar cell module.
The terminal box and the solar cell module mounting method were conceived, and the realization of a terminal box suitable for the mounting method was planned, and the present invention was achieved.

Such terminal box to one aspect of the present invention, a housing, a plurality of terminal plates and the one end portion of the connected external connection cable to the terminal plate A including the terminal box, the solar cell module to the terminal board In a terminal box for a solar cell module to which an uncoated output electric wire extending from is connected ,
The housing includes a bottom plate, a peripheral wall rising from the bottom plate, and an attachment portion formed at an upper end of the peripheral wall over the entire upper end portion of the peripheral wall, and the bottom plate and the peripheral wall are disposed inside the housing. The outside is partitioned in a watertight manner, and the inner periphery of the adhering part forms a housing opening,
The bottom plate or the peripheral wall has a cable penetration part, the external connection cable passes through the cable penetration part, and the other end of the external connection cable is positioned outside the casing, and the cable penetration part and the external part The connection cable is kept watertight,
The terminal board is disposed inside the housing and fixed to the housing ,
A partition wall provided between the terminal plates and rising from the bottom plate ;
An auxiliary adhering portion attached to the upper end of the partition wall is provided.

  In a preferred embodiment of the terminal box according to the present invention, the cable penetration part may be a sheath part protruding from the bottom plate or the peripheral wall toward the outside of the casing.

  According to the present invention, as a result of extending the water intrusion path into the terminal box by the sheath, the terminal box can be kept more watertight.

  In a preferred embodiment of the terminal box according to the present invention, the end of the terminal plate is in the vicinity of the peripheral wall, in the vicinity of the adhering part, and closer to the bottom plate than the surface of the adhering part. It may be positioned.

In the present invention, the adjacent region including the end portion of the terminal board or the region close to the end portion is a receiving portion of the output electric wire extending from the solar cell module.
According to the present invention, the output wire receiving portion approaches the output wire lead-out portion of the solar cell module, and the output wire accommodated in the terminal box in a floating state can be shortened. And the contact between the output electric wire and the structure in the terminal box can be suppressed, and the terminal box can be more suitable for reverse attachment.

  In a preferred embodiment of the terminal box according to the present invention, the housing may be formed by integral molding using a thermoplastic synthetic resin as a material.

  According to the present invention, it is possible to achieve a terminal box in which the watertightness of the housing is ensured and the production cost and the number of production steps are reduced.

  In a preferred embodiment of the terminal box according to the present invention, at least a part of the adhering portion may have a front / side surface reaching shape of the back surface coating caulking agent.

  According to the present invention, the portion of the terminal box that is difficult to apply the adhesive to the surface of the terminal box (for example, the portion where the output wire straddles) is attached to the solar cell module from the terminal box side. By applying a caulking agent, it becomes possible to position the caulking agent at a position suitable for watertight maintenance, and it becomes a terminal box that can further simplify the mounting process and achieve watertightness after mounting.

  In a preferred embodiment of the terminal box according to the present invention, the front / side surface reaching shape of the back coating caulking agent may be a penetrating portion provided in the adhering portion.

  In a preferred embodiment of the terminal box according to the present invention, the front / side surface reaching shape of the back coating caulking agent is a concave ridge on the surface of the adhesion portion provided in the adhesion portion, You may have a through-hole in both ends.

  In a preferred embodiment of the terminal box according to the present invention, the surface / side surface reaching shape of the back coating caulking agent is such that the outer peripheral end surface of the adhesion portion is closer to the back surface of the adhesion portion than the surface of the adhesion portion. The shape may protrude in the direction of the outside of the body.

A method for attaching a terminal box to a solar cell module according to another aspect of the present invention includes the following steps.
A. The process of preparing the terminal box concerning this invention.
B. An output wire that is an uncovered output wire extending from the output wire lead-out portion of the solar cell module is guided into the terminal box from the housing opening of the terminal box, and the output wire is connected to the terminal of the terminal box. Connecting to the board.
C. The adhering portion of the terminal box faces the surface layer of the solar cell module, the output electric wire is accommodated in the terminal box, and the output electric wire outlet portion of the solar cell module is opened to the housing of the terminal box. A step of attaching the terminal box to the solar cell module, being positioned in a plane of the portion.

A method for attaching a terminal box to a solar cell module according to another aspect of the present invention includes the following steps.
A. A step of preparing a terminal box according to the present invention, wherein at least a part of the adhering portion has a front / side surface reaching shape of a back coating caulking agent.
B. An output wire that is an uncovered output wire extending from the output wire lead-out portion of the solar cell module is guided into the terminal box from the housing opening of the terminal box, and the output wire is connected to the terminal of the terminal box. Connecting to the board.
C. The adhering portion of the terminal box faces the surface layer of the solar cell module, the output electric wire is accommodated in the terminal box, and the output electric wire outlet portion of the solar cell module is opened to the housing of the terminal box. A step of attaching or temporarily fixing the terminal box to the solar cell module.
two. A step of applying the caulking agent to the front and side surface reaching shape of the back side coating caulking agent in the adhering portion of the terminal box;

  According to the present invention, the operation of applying the adhesive to the adhesion portion of the terminal box is reduced or eliminated, and the operation of applying the caulking agent is further facilitated.

  The solar cell system concerning the other aspect of this invention is a solar cell system containing the solar cell module manufactured by the method of attaching a terminal box to the solar cell module concerning this invention, and a terminal box integrated object.

  The present invention described above, preferred embodiments of the present invention, and components included in these can be implemented in combination as much as possible.

  Since the terminal box according to the present invention has a structure in which the attachment portion is provided and the bottom plate and the peripheral wall partition the inside of the housing in a watertight manner, the terminal box is reversed and attached to the solar cell module. It is a terminal box suitable for. And according to this invention, it has the effect that the cost of terminal box preparation is reduced, the reduction | decrease and simplification of the assembly | attachment process to a solar cell module are possible, and a terminal box is obtained. In addition, a terminal box that can further prevent water from entering the terminal board can be obtained.

  Moreover, the method of attaching the terminal box to the solar cell module according to the present invention is an attachment method that uses a terminal box whose production cost is further reduced and realizes reduction and simplification of the assembly process to the solar cell module. In addition, this is an attachment method that has an effect of further preventing water from entering the terminal board.

  Furthermore, the solar cell system according to the present invention is a solar cell system in which the production cost is further reduced and the durability and reliability over a long period of time are further improved.

  Hereinafter, a terminal box for a solar cell module and a solar cell system according to an embodiment of the present invention will be further described with reference to the drawings. The dimensions, materials, shapes, relative positions, etc. of the members and parts described in the embodiments of the present invention are not intended to limit the scope of the present invention only to those unless otherwise specified. It is just an illustrative example.

  FIG. 1 is an explanatory diagram of a solar cell system according to the present invention. The solar cell system 101 includes a solar cell module 6 and a terminal box 1, and includes an inverter (not shown), a distribution board (not shown), and the like as necessary. The terminal box 1 is attached to the solar cell module 6 with the attachment portion 13 of the terminal box positioned on the surface layer of the solar cell module 6. The solar cell module 6 usually includes a plurality of solar cells, and a certain number of these solar cells are connected in series to form cell strings, and power is taken out from output wires connected to both ends of the cell strings.

  The terminal box 1 has a terminal plate to which the above-described output wire is connected, and an external connection cable 30 connected to the terminal plate. The external connection cable 30 has connectors 33 and 34 at the tip thereof. It is connected to the adjacent terminal box 1. In the illustrated solar cell module 6, the output electric wire is taken out from the central portion of the back surface of the solar cell module 6, and the terminal box 1 is attached to the central portion of the back surface of the solar cell module 6 so as to cover the lead-out portion of the output electric wire. Has been.

  2 is a partially cutaway perspective view of the terminal box 1 according to the present invention as seen from the housing opening 16 side, and FIG. 3 is a perspective view of the terminal box 1 according to the present invention as seen from the bottom plate 11 side. It is.

  The terminal box 1 includes a housing 10, two terminal plates 20, and two external connection cables 30. In a state where one end of the terminal plate 20 is wound around the core wire 31 of the external connection cable 30, the end of the terminal plate 20 is caulked, and one end of the external connection cable 30 is connected to the terminal plate 20.

  The housing 10 includes a bottom plate 11, a peripheral wall 12 rising upward from the bottom plate 11, and an attachment portion 13 formed at the upper end of the peripheral wall 12 over the entire upper end portion of the peripheral wall 12. The peripheral wall 12 may rise from any region of the bottom plate 11, but from the viewpoint of saving material of the terminal box, downsizing of the terminal box, and workability of applying a caulking agent to the adhesion portion 13 described later, the peripheral wall 12 is It is preferable to stand up from the outer periphery of 11.

  The peripheral wall 12 surrounds the entire outer peripheral area of the bottom plate 11. The bottom plate 11 and the peripheral wall 12 are formed continuously and partition the inside and the outside of the housing 10 in a watertight manner.

  The adhering portion 13 has a hook shape protruding from the upper end of the peripheral wall toward the outside of the housing 10. But the adhesion part should just have sufficient area for the surface to affix the terminal box 1 on the surface layer of a solar cell module with fixed intensity | strength. Therefore, for example, the thickness of the peripheral wall may be increased as it goes upward, and the upper end may be used as the attachment portion, or may be shaped to protrude toward the inside of the housing. From the viewpoints of saving housing materials, ease of incorporation of internal structures such as terminal boards, and the ease of connecting the output wires of the solar cell module and the terminal boards, the adhering part should be directed outward from the peripheral wall. It is preferable that the shape protrudes into a shape.

  A housing opening 16 is formed on the inner periphery of the attachment portion 13. In the illustrated embodiment, the inner periphery of the adhering portion 13 is equal to the inner periphery of the upper end of the peripheral wall 12. The housing opening 16 is an opening for assembling an internal structure such as a terminal plate, connecting the output wire of the solar cell module and the terminal plate, and for accommodating the output wire of the solar cell module. Is the opening.

  A sheath portion 42 is formed on the peripheral wall 122 which is one region of the peripheral wall 12. The inside of the sheath part 42 is a cavity, and the external connection cable 30 passes through the sheath part 42. The other end of the external connection cable 30 is positioned outside the housing 10. The other end of the external connection cable 30 is connected to a connector 33 and a connector 34 not shown in FIGS.

  The sheath portion in which the external connection cable 30 is housed in the hollow portion is held watertight by a cover that integrally seals the outer periphery of the sheath portion and the outer periphery of the external connection cable that exists outside the sheath portion and in the vicinity of the sheath portion. Yes. The cover can be formed by integrally attaching and molding a molten thermosetting resin (for example, polyvinyl chloride) on the outer periphery of the sheath and the external connection cable. Alternatively, the outer periphery of the sheath and the external connection cable may be covered with a heat-shrinkable resin tube (for example, a polyvinyl chloride tube), and applied and molded by applying heat. Furthermore, a watertight resin such as a silicone resin may be filled in the gap between the sheath and the external connection cable. The cover is not shown.

  The sheath portion 42 is intended to extend the water intrusion path from the outside to the inside of the housing 10 and to prevent water intrusion. For example, a screw is screwed on the outer periphery of the sheath portion, and an external connection cable is connected. It may be secured with a cap nut to be waterproof and fixed. Moreover, you may provide a sheath part in the baseplate of a housing | casing.

  Further, the sheath portion is not provided, and for example, a partition region may be created on the peripheral wall or bottom plate of the housing 10 and the external connection cable may be penetrated, and then the partition region may be filled with silicon resin or the like to achieve watertightness. . This silicon resin filling operation is performed during the assembly operation of the terminal box alone. For example, even if the solidification time is increased, a large work place is not required in the temporary storage place while waiting for curing. In this respect, the conventional terminal box assembling work is different from the silicon resin filling work and the subsequent hardening waiting work in the terminal box in the solar cell module and the terminal plate integrated object.

  From the standpoint of reducing the cost of creating the terminal box and reducing the assembly work of the terminal box itself, a sheath is provided with a smooth outer peripheral surface (that is, not engraved with screws), and a cover is formed after the external connection cable is inserted. It is preferable to seal the gap between the sheath and the external connection cable by filling the gap between the external connection cable and the resin.

  The protruding length of the sheath from the peripheral wall or the bottom plate is usually 15 mm or more, preferably 25 mm or more. There is no particular upper limit to the protrusion length, but the length is preferably 50 mm or less.

  In the terminal plate 20, one end 23 facing the connection end with the external connection cable is positioned in the vicinity of the one peripheral wall 123 and in the vicinity of the one attachment portion 132. The one peripheral wall 123 is a peripheral wall that faces the one peripheral wall 122 in which the sheath portion is formed. In the terminal plate 20, a region that includes the one end portion 23 and is close to the one end portion 23 of the terminal plate 20 or a region that is close to the one end portion 23 is the output wire receiving portion 22. An output electric wire extending from the solar cell module is connected to the output electric wire receiving portion 22 by connection means such as soldering or spot welding. Here, “proximity” used in the expression “adjacent region” usually means within 10 mm, preferably within 8 mm, more preferably within 5 mm.

On the other hand, since the end portion 23 is positioned in the vicinity of the peripheral wall 123 and in the vicinity of the attachment portion 132, the distance from the output wire lead-out portion 61 of the solar cell module to the output wire receiving portion 22 (that is, the length of the output wire 62). Can be shortened. In a state where the terminal box is attached to the solar cell module, the output electric wire 62 is accommodated in the housing 10 of the terminal box 1 in an idle state. Since the length of the output electric wire 62 can be shortened by positioning the one end portion 23 and / or the output electric wire receiving / receiving portion 22 at the position described above, even if a terminal box is attached to the solar cell module, or coating-free output wire in contact with the terminal box structure, the output electric wires can Ru can reduce a situation or to contact. Also, by having positioned above position whereas the end 23 and / or output wire受接unit 22, the connection work of the output wires 62 and the terminal plate 20 is facilitated.

  The fact that one end 23 is positioned in the vicinity of the peripheral wall 123 means a positional relationship in the left-right direction in FIG. 2. For example, heat at the time of soldering works on the peripheral wall 123 made of synthetic resin or the like. This means that the distance does not have a bad influence and the distance between the output wire receiving portion 22 and the peripheral wall 123 is as short as possible. If this is expressed by the distance between the one end portion 23 and / or the output wire receiving portion 22 and the peripheral wall 123, the distance is usually 0.5 mm or more and 10 mm or less, preferably 0.5 mm or more and 5 mm or less. means.

  Further, the fact that the one end portion 23 is positioned in the vicinity of the attachment portion 132 means a positional relationship in the vertical direction in FIG. 2, and in order to shorten the length of the output wire 62, the output wire 62 is It means that the one end 23 is positioned at a position where the linear distance is short across the adhering portion 132. If this is expressed by the distance between the extended surface of the surface 146 of the attachment portion 132 and the one end portion 23 and / or the output wire receiving portion 22, the distance is usually 0.5 mm or more and 10 mm or less, preferably It means 0.5 mm or more and 5 mm or less.

  At the same time, the one end portion 23 must be positioned below the extension surface of the surface 146 of the attachment portion 132 (in the direction toward the bottom plate 11). This is to avoid contact between the surface layer of the solar cell module to which the terminal box is attached and the one end 23.

  On the other hand, the portion of the terminal plate 20 except the output wire receiving portion 22 is preferably positioned at a position close to the bottom plate 11 from the viewpoint of avoiding accidental contact with the output wire 62 of the solar cell module.

  In order to realize the positioning of the output wire receiving portion 22 and other portions described above, the terminal plate 20 is bent in an L shape as shown in FIG. The terminal board 20 may realize the positional relationship described above by means such as a stepped shape or a curved surface.

  The terminal board 20 has a through hole. By passing the engaging pin protruding upward from the bottom plate 11 through the through hole and fixing the star-plate fitting 24 to the engaging pin, the terminal plate 20 is disposed inside the casing 10 and the casing 10 is fixed.

  A bypass diode 26 is connected between the two terminal plates 20. The bypass diode 26 serves to protect the solar cell module from a reverse bias load.

  A partition wall 51 is provided between the two terminal boards 20. Although the partition wall 51 is continuous with the peripheral wall 123, the partition wall 51 is partially omitted in FIG. The partition wall 51 plays a role of preventing mutual contact of output wires. For this reason, the partition wall 51 is usually formed from the peripheral wall 132 closest to the output wire receiving / receiving portion 22 to the vicinity of the center of the casing.

  However, in the case of providing a partition wall, a minimum partition wall is required from a position 10 mm to 15 mm away from the reference point to the inside of the housing from the output wire receiving portion 22 as a reference point to the vicinity of the center of the housing. It is a position. This is because the output wires connected (fixed) to the output wire receiving portion 22 do not contact each other in the vicinity of the output wire receiving portion 22.

  Moreover, it is preferable that the upper end of the partition wall 51 is substantially equal to the upper surface of the adhesion part 13. This is from the viewpoint of preventing mutual contact between the output wires. At the same time, the upper end of the partition wall 51 needs to be positioned below the extended surface of the surface 146 of the attachment portion 13 (in the direction toward the bottom plate 11). This is to avoid contact between the surface layer of the solar cell module to which the terminal box is attached and the partition wall 51.

  An auxiliary attachment portion 52 is provided in the opening of the housing 10. The auxiliary attaching part 52 is attached to the upper end of the partition wall 51. The auxiliary attaching part 52 is coated with a pressure-sensitive adhesive (pressure-sensitive adhesive) on the surface (for example, a double-sided pressure-sensitive adhesive tape is applied), and until the adhesive applied to the attaching part 13 is cured, This is useful for temporarily fixing the terminal box. As the pressure-sensitive adhesive, a known pressure-sensitive adhesive such as acrylic can be used. Moreover, the adhesive application surface is usually covered with a release sheet. But you may affix on a solar cell module by apply | coating a short-time-hardening adhesive agent to the auxiliary | assistant attachment part 52, or apply | coating the adhesive agent same as the adhesive agent apply | coated to the attachment part 13. FIG.

  The casing 10 can be formed by integral molding using a modified polyphenylene ether, polyphenylene ether, polyphenylene sulfide, synthetic rubber (for example, ethylene propylene rubber, silicon rubber, or fluoro rubber), or other synthetic resins. Thereby, it is excellent in watertightness, and a terminal box can be created at a lower cost. However, for example, the bottom plate portion and the peripheral wall portion may be separately created, and these may be assembled in a watertight manner to create the housing.

  Further, a synthetic resin having a certain flexibility, such as synthetic rubber, is used as the material of the housing 10, and at the same time, it can be used as an adhesive and / or a caulking agent after curing such as synthetic rubber. The use of a flexible material is preferable because the terminal box or the like can follow the deformation of the solar cell module after being attached to the solar cell module, and has more durability.

  The terminal box 1 is attached with the attachment portion 13 in contact with the surface layer of the solar cell module 6. Since the periphery of the output wire lead-out portion of the solar cell module is usually a flat surface, the upper surface of the attachment portion 13 is usually formed flush with each other. The surface shape of the surface 146 of the adhesion part 13 should just select the surface suitable for the surface layer base material of a solar cell module, the adhesive agent to be used, etc. For example, a smooth surface may be sufficient and a rough surface may be sufficient. A groove may be provided. In the case where a groove is provided on the surface 146 of the attachment portion 13, it is preferable to form the groove parallel or substantially parallel to the peripheral wall from the viewpoint of adhesion in a watertight state.

  When the adhesive is applied to the adhesion part 13, the side-side adhesion part 134 and the external connection cable-side adhesion part 133 can be easily applied without any obstacle, but the adhesion part 132 over which the output wire is straddled. The output electric wire becomes an obstacle, and it takes time to apply the adhesive. Here, after the adhesive is applied, the terminal box 1 is turned over, so that the contact between the output electric wire and the attachment portion 132 is eliminated.

  The output electric wire is usually a ribbon-shaped conductor, and if the width is small (for example, about 1 mm to 3 mm), the release of the contact causes the malleability of the pre-curing adhesive to be in the vicinity. The applied adhesive spreads easily to the adhering portion covered with the ribbon-like lead wire. However, if the width of the ribbon-shaped output electric wire is large (for example, more than about 4 mm), the adhesive may not be expected to spread to the adhesive non-application area.

  Therefore, it is preferable that the adhering portion 13, particularly the adhering portion 132 over which the output wire straddles when the output electric wire 62 is connected to the terminal plate 20, has a front / side surface reaching shape of the back coating caulking agent. 4, 5, and 6 illustrate the front and side surface reaching shapes of the three kinds of back surface coating caulking agents formed on the adhesion portion 132, and (a) is a perspective explanatory view of the adhesion portion 132, respectively. b) is a cross-sectional explanatory view of the adhering portion 132.

  FIG. 4 is an explanatory view of the adhering portion 132 provided with a penetrating portion which is one embodiment of the front / side surface reaching shape of the back coating caulking agent. Referring to FIG. 4, the attachment portion 132 has a through portion 141. The penetrating portion 141 is a long hole in a direction parallel to the peripheral wall 12 and penetrates the attachment portion surface 146 and the attachment portion back surface 147. When the caulking agent is applied to the penetrating portion 141 from the attached portion back surface 147 side in the direction indicated by the arrow 74 in the figure, the caulking agent reaches the front surface side and the side surface side of the attached portion 132, and the solar cell module surface and the attached portion 132. Can be more effectively sealed in a watertight manner.

  When providing the penetration part 141 in the whole area | region of the adhesion part 13, what is necessary is just to provide an appropriate number of connection parts in the adhesion part back surface 147 side.

  FIG. 5 is an explanatory diagram of the adhering portion 132 provided with a ridge which is one aspect of the front / side surface reaching shape of the back coating caulking agent. Referring to FIG. 5, the attachment portion 132 has a concave ridge 142 on the attachment portion surface 146. The eaves 142 extend in a direction parallel to the peripheral wall 12 and have eaves through-holes 143 at both ends. When the adhesion portion is positioned in contact with the surface of the solar cell module and the caulking agent is injected from one through hole 143, the caulking agent fills the inside of the ridge 142 and reaches the other through hole 143. In this manner, the caulking agent reaches the surface side and the side surface side of the attachment portion 132, and the solar cell module surface and the attachment portion 132 can be more effectively sealed in a watertight manner.

  An appropriate number of through holes may be provided. For example, when the ridge 142 is provided in the entire region of the adhesion portion 13, an appropriate number of dam plates may be provided in a part of the ridge surrounding the entire circumference, and through holes may be provided in the vicinity of both sides of the dam plate. it can. Furthermore, it is preferable to apply a pressure-sensitive adhesive (for example, a double-sided pressure-sensitive adhesive tape may be applied) to the adhesion portion surface 146 along the heel on the outer side and / or the inner side of the heel. If it does in this way, after temporarily fixing the adhesion part 13 with an adhesive, a caulking agent can be apply | coated from a through-hole, and an operation | work becomes easy.

  The aspect in which the wrinkles are provided is characterized by a good finished appearance after application of the caulking agent.

  FIG. 6 is an explanatory view of the adhering portion 132 provided with an outer peripheral end surface protruding shape which is one aspect of the front and side surface reaching shape of the back coating caulking agent. Referring to FIG. 6, the outer peripheral end surface 145 of the attachment portion 132 has an attachment portion back surface 147 that protrudes from the attachment portion surface 146 toward the outside of the housing. The illustrated projecting shape is a C surface 144 projecting from the adhesion part surface 146 to the adhesion part back surface 147 in a straight section. The cross section of the end is not limited to the C plane, and may be a curve or a polygonal line, for example.

  When the caulking agent is applied to the outer peripheral end surface 145 in the direction indicated by the arrow 75 in the figure, the caulking agent reaches the surface side and the side surface side of the attachment portion 132, and the solar cell module surface and the attachment portion 132 are more effectively watertight. Can be sealed.

  FIG. 7 is an explanatory diagram of a process of attaching the terminal box 1 to the solar cell module. The paper surface of FIG. 7 is a surface on which the output wire lead-out portion 61 of the solar cell module exists, and the output wire 62 extends from the output wire lead-out portion 61.

  With reference to (a), the terminal box 1 is positioned in the vicinity of the output wire lead-out portion 61. Then, the output electric wire 62 is guided from the housing opening 16 of the terminal box 1 into the terminal box 1 across the surface 146 of the attachment portion 132. The distal end portion of the output electric wire 62 is connected to the output electric wire receiving portion 22 of the terminal plate 20 by soldering or the like.

  Next, referring to (b), an adhesive is applied to the attachment portion 133 on the external connection cable connection side and the attachment portion 134 on the side surface side. An adhesive may or may not be applied to the adhering portion 132 over which the output electric wire 62 is straddled, but it is preferable to apply the adhesive. At the same time, the release sheet attached to the auxiliary adhesion portion 52 is removed, and the adhesive applied to the auxiliary adhesion portion is exposed.

  Subsequently, the terminal box 1 is inverted with reference to (c). After the reversal, the terminal box is positioned on the surface layer portion of the solar cell module so that the output wire lead-out portion 61 enters the plane of the housing opening. That is, the housing opening 16 of the terminal box 1 covers the output wire lead-out portion 61. At the same time, the output electric wire 62 is accommodated inside the terminal box. If the terminal box is inverted, the output electric wire 62 straddling the adhering portion 132 is released from contact with the adhering portion 132.

  Then, by pressing the terminal box against the solar cell module, the terminal box 1 is temporarily fixed by the action of the adhesive applied to the auxiliary attachment portion 52. Thereafter, the terminal box 1 is attached to the solar cell module by curing the adhesive.

  Next, referring to (d), the caulking agent 132 is applied to the front / side surface reaching shape portion (attachment portion 132 in the terminal box 1 shown in the figure) of the temporarily applied backside coating caulking agent of the terminal box 1. Apply from the side. In addition, this process is arbitrary addition processes, and is limited to the case where the terminal box 1 has the front and side surface reaching shape of the back surface coating caulking agent.

  However, even if the terminal box 1 does not have the front / side surface reaching shape of the back coating caulking agent, the caulking agent may be applied to the outer peripheral side surface of the adhesion portion 13.

  In the present invention and the present specification, an adhesive means a substance that plays a role of adhering both coated surfaces at a constant strength, and a caulking agent plays a role of keeping the coated surface watertight. Means a substance. When cured, the adhesive plays a role in watertightness, and the caulking agent plays a role in adhesion when cured. Therefore, in the present invention and the present specification, the adhesive and the caulking agent may be the same substance.

  As such adhesives and / or caulking agents, silicone rubber-based, epoxy-based, polyurethane-based, acrylic-based, etc., known adhesives, caulking agents, or fillers conventionally used for filling in terminal boxes are used. Can be used.

  In the above embodiment, the terminal box 1 has two terminal plates. However, the present invention can be applied to a terminal box including three or more terminal plates, a method for attaching the terminal box, and the like.

  The terminal box concerning this invention can be used with a solar cell module in order to take out the electric power of a solar cell module. The method of attaching a terminal box to a solar cell module according to the present invention can be used for assembling a solar cell system.

It is explanatory drawing of a solar cell system. FIG. 5 is a partially cutaway perspective view of the terminal box 1 as viewed from the housing opening 16 side. It is the perspective view which looked at the terminal box 1 from the baseplate 11 side. It is explanatory drawing of the adhesion part 132 which provided the penetration part which is one aspect | mode of the front and side surface arrival shape of a back surface coating caulking agent, (a) is a perspective explanatory drawing of the adhesion part 132, (b) is the adhesion part 132. FIG. It is explanatory drawing of the adhesion part 132 which provided the wrinkles which is one aspect | mode of the surface and side surface arrival shape of a back surface coating caulking agent, (a) is a perspective explanatory view of the adhesion part 132, (b) is a cross section of the adhesion part 132. It is explanatory drawing. It is explanatory drawing of the adhesion part 132 which provided the outer periphery end surface overhang | projection shape which is one aspect | mode of the surface and side surface arrival shape of a back surface coating caulking agent, (a) is a perspective explanatory drawing of the adhesion part 132, (b) is an adhesion part. FIG. It is explanatory drawing of the process of attaching the terminal box 1 to a solar cell module, and the said process progresses in order from (a) to (d).

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Terminal box 6 Solar cell module 101 Solar cell system 10 Case 11 Bottom plate 12 Peripheral wall 122 Peripheral wall which has a sheath part 123 Peripheral wall which faces a sheath part 13 Adhesion part 132 Adhesion part which an output electric wire straddles 133 External connection cable side adhesion part 134 Side surface Side adhering portion 14 Surface / side surface reaching shape of back coating caulking agent 141 Through portion 142 樋 143 樋 樋 Through hole 144 C surface 145 Adhering portion outer peripheral end surface 146 Adhering portion surface 147 Adhering portion rear surface

16 Housing opening 20 Terminal plate 22 Output wire receiving portion 23 End portion 24 Kikuza fitting 26 Diode 30 External connection cable 31 Core wire 33, 34 Connector 42 Sheath portion 51 Bulkhead 52 Auxiliary attachment portion 61 Output wire lead-out portion 62 Output wire 71 Adhesive 72 Caulking agent

Claims (11)

A housing, a terminal box including a plurality of terminal boards and an external connection cable having one end connected to the terminal board, to which uncoated output electric wires extending from the solar cell module are connected to the terminal board In the terminal box for solar cell modules,
The housing includes a bottom plate, a peripheral wall rising from the bottom plate, and an attachment portion formed at an upper end of the peripheral wall over the entire upper end portion of the peripheral wall. The bottom plate and the peripheral wall The outside is partitioned in a watertight manner, and the inner periphery of the adhering part forms a housing opening,
The bottom plate or the peripheral wall has a cable penetration part, the external connection cable passes through the cable penetration part, and the other end of the external connection cable is positioned outside the casing, and the cable penetration part and the external part The connection cable is kept watertight,
The terminal board is disposed inside the housing and fixed to the housing,
A partition wall provided between the terminal plates and rising from the bottom plate;
It is those in which an auxiliary attachment that is attached to an upper end of said partition wall,
The upper surface of the auxiliary attaching part is a plane,
The upper surface of the auxiliary adhesion part and the adhesion part are formed flush with each other ,
A terminal box, wherein an adhesive is applied to an upper surface of the auxiliary adhesion portion .   The terminal box according to claim 1, wherein the cable penetrating portion is a sheath portion protruding from the bottom plate or the peripheral wall toward the outside of the housing.   3. The terminal plate according to claim 1, wherein an end portion of the terminal plate is positioned in the vicinity of the peripheral wall, in the vicinity of the attachment portion, and on the bottom plate side from the surface of the attachment portion. The terminal box described above.   4. The terminal box according to claim 1, wherein the casing is formed by integral molding using a thermoplastic synthetic resin as a material. 5.   The terminal box according to any one of claims 1 to 4, wherein at least a part of the adhering portion has a front / side surface reaching shape of a back coating caulking agent.   The terminal box according to claim 5, wherein a front / side surface reaching shape of the back coating caulking agent is a penetrating portion provided in the adhering portion.   The front and side surface reaching shape of the back coating caulking agent is a concave ridge on the surface of the adhesion portion provided in the adhesion portion, and has through holes at both ends of the ridge. The terminal box described in 1.   The front and side surface reaching shape of the back surface coating caulking agent is characterized in that the outer peripheral end surface of the adhering portion is a shape in which the back surface of the adhering portion protrudes from the surface of the adhering portion toward the outside of the housing. The terminal box according to claim 5. A method for attaching a terminal box to a solar cell module comprising the following steps.
A. The process of preparing the terminal box in any one of Claims 1 thru | or 4.
B. An output wire that is an uncovered output wire extending from the output wire lead-out portion of the solar cell module is guided into the terminal box from the housing opening of the terminal box, and the output wire is connected to the terminal of the terminal box. Connecting to the board.
C. The adhering portion of the terminal box faces the surface layer of the solar cell module, the output electric wire is accommodated in the terminal box, and the output electric wire outlet portion of the solar cell module is opened to the housing of the terminal box. A step of attaching the terminal box to the solar cell module, being positioned in a plane of the portion. A method for attaching a terminal box to a solar cell module comprising the following steps.
A. A step of preparing the terminal box according to claim 5.
B. An output wire that is an uncovered output wire extending from the output wire lead-out portion of the solar cell module is guided into the terminal box from the housing opening of the terminal box, and the output wire is connected to the terminal of the terminal box. Connecting to the board.
C. The adhering portion of the terminal box faces the surface layer of the solar cell module, the output electric wire is accommodated in the terminal box, and the output electric wire outlet portion of the solar cell module is opened to the housing of the terminal box. A step of attaching or temporarily fixing the terminal box to the solar cell module.
two. A step of applying the caulking agent to the front and side surface reaching shape of the back side coating caulking agent in the adhering portion of the terminal box;   A solar cell system comprising a solar cell module and a terminal box integrated body manufactured by a method of attaching a terminal box to the solar cell module according to claim 9.

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