JP4948492B2 - Diode connection structure of terminal box for solar cell module - Google Patents

Description

  The present invention relates to a terminal box used when mutually connecting solar cell modules constituting a solar power generation system that directly converts solar energy into electric energy, in particular, a plurality of electrodes to which the electrodes of the solar cell module are connected. The present invention relates to a structure for connecting a backflow prevention diode between terminal plates and a method for connecting the same.

  As shown in FIG. 16, the photovoltaic power generation system includes a solar cell panel (solar cell module) M arranged on the roof of a house, and various electric powers from the module M through a junction box Q, an inverter R, and a distribution board S. Supply power to device E. The solar cell modules M are arranged so as to be all flush with each other as shown in FIG. 17, and are connected in series or in parallel via the terminal box B. The terminal box B is adhered and fixed to the back surface of the module M while maintaining the watertightness of the sealing material.

As shown in FIG. 18, the terminal box B generally has a positive electrode (also referred to as “electrode wire”, hereinafter the same) a and a negative electrode wire of a solar cell module M in a box body 1 having an upper surface opening. A pair of terminal plates 2 and 2 to which a is connected are arranged in parallel, a backflow prevention (bypass) diode 3 is provided between the two terminal plates 2 and 2, It is the structure which connected the cable P for external connection (refer patent document 1 FIG. 11, FIG. 15). In the figure, 6 is a cover.
Japanese Patent No. 3965418

In the terminal box B, the terminal plate 2 and the diode 3 are connected by soldering the legs 3 a of the diode 3 to the terminal plate 2.
Similarly, the connection between the electrode wire a and the backflow prevention diode connecting terminal plate 2 is also generally soldered.

The connection means by soldering is generally troublesome and is generally performed at the factory at the time of shipment. Also, soldering has a problem in reliability of connection strength.
Furthermore, in the case of the electrode wire a, when the length of the electrode wire a due to the change in the arrangement of the solar cell module M becomes inappropriate at the site, the connection between the electrode wire a and the terminal plate 2 must be re-established. Occurs. In this case, it is necessary to re-request the terminal box to which the electrode wire a having a length suitable for the arrangement or the like is connected to the factory. This is because the soldering operation is not normally performed in the field.

  In view of the above circumstances, an object of the present invention is to enable connection between the terminal board and a diode by means other than soldering.

In order to achieve the above object, according to the present invention, a connection is first made by crimping a connecting tool.
Since connection by crimping is generally an easy operation, it can be easily performed in the factory as well as in the factory.

Next, according to the present invention, the connecting portion on the terminal plate side of the crimping portion is made into a rod shape, and the leg or electrode wire of the diode is applied to the rod-like connecting portion (winding), and the fitting portion (winding portion) is applied. The sleeve, which is a connection tool, was fitted and crimped.
It is relatively easy to apply the legs of the diode or the winding of the electrode wire to the rod-like connection part not only in the factory but also in the field. Moreover, the crimping | compression-bonding of the sleeve to the applied rod-shaped part (wound) is an operation normally performed in wire connection, and the operation is also easy.
At that time, the leg or the electrode wire is drawn out through the slit of the sleeve. The slit only needs to have a size (length) sufficient for drawing out the leg or the electrode wire, but it is preferable that the slit is in the entire axial length of the sleeve. If the slit has a full length, the sleeve can be widened through the slit and fitted into the connecting portion, and it is not necessary to fit in the connecting portion in advance, and workability is good.

  As a configuration related to the connection between the terminal plate and the diode of the present invention, a plurality of terminal plates to which the electrodes of the solar cell module are connected are disposed in the box body, and a backflow preventing diode is provided between the adjacent terminal plates. A diode connection structure in which the legs of the terminal box for a solar cell module provided via the legs are connected to a terminal plate, and the connection portion of the terminal plate with the legs is a rod shape, and the leg connection portion is connected to the leg connection portion. The connecting end of the leg is applied and a sleeve is put on the outer periphery of the applied part and crimped, and the leg is crimped and connected to the terminal plate by the sleeve, and the connecting end of the leg is connected through the slit of the sleeve. A configuration applied to the rod-like connecting portion can be employed.

  At this time, as described above, the slit may be the entire length in the axial direction of the sleeve or may be partial, but the shape and size are such that the connecting end of the leg reaches the connecting portion of the terminal plate through the slit. The length of the sleeve is arbitrary and may be any length that can be stopped with sufficient connection strength.

The sleeve may be a general one that is plastically deformed by a crimping jig, but as a clip-like one made of a spring member in which an axial slit is formed, the sleeve is expanded through the slit to form a diode. The connecting end of the leg is fitted into the applied bar-shaped connecting portion, and the connecting end of the diode leg can be crimped to the bar-shaped connecting portion by the spring property of the sleeve.
In this way, the connection work is completed simply by fitting the sleeve, so that the workability is good.

In addition, if the groove on which the leg is fitted is formed on the inner peripheral surface of the sleeve, the leg is positioned with respect to the sleeve, the positioning of the leg with respect to the terminal board is stabilized, and the connection strength of the diode to the terminal board is stable. Obtainable.
At this time, if the legs are fitted into the recesses so that the inner surfaces of the sleeves other than the recesses are in pressure contact with the rod-like connecting portion of the terminal plate, the sleeve is also positioned with respect to the terminal plate and the mounting state is stable. To do. This stabilizes the connection of the diode (its legs) to the terminal board (the reliability of the connection strength is also improved).

As for the connection mode of the rod-shaped connecting portion of the terminal plate and the diode leg, the axial direction of both of them may be the same (on the same axis), or the axial direction may intersect orthogonally, etc. When the two longitudinal directions (axial directions) are crossed and connected, for example, the sleeve is formed with a slit extending over the entire length in the length direction, and the leg of the leg extends in the sleeve circumferential direction from the side edge of the slit. It can be set as the structure by which the slit which a connection end passes is formed.
With this configuration, the leg can be guided to the rod-like connecting portion through the slit in the circumferential direction. Therefore, even if the sleeve is nearly cylindrical, the sleeve can cover most of the rod-like connecting portion. For this reason, the attachment to the rod-shaped connection part of a sleeve is stabilized.

At this time, if a lateral slit is further formed at the circumferential tip of the slit through which the connecting end of the leg passes and the connecting end of the leg is led into the slit, the leg is placed in the lateral slit. The leg is difficult to be detached from the sleeve, and the connection state between the leg and the rod-like connecting portion is stabilized.
In addition, if a projecting piece facing outward is provided at the circumferential tip of the slit through which the connecting end of the leg passes, and the inner surface of the projecting piece is applied to the leg, the leg is made into a rod-like connecting portion by the projecting piece. Since the pressing force acts, the connection strength between the leg and the rod-like connecting portion is improved. In this case, if the projecting piece is applied to the base end side of the leg connection end, the base end side of the leg connection end (introduction side end to the rod-like connection part) is pressed, and the pressing is performed. Since the force is exerted over the entire length of the connection end, an appropriate connection strength can be obtained. The protruding piece can be provided only on the base end side of the connecting end of the leg.

  The number of terminal plates is also arbitrary, and in the case of the present invention, it can be adopted if a backflow prevention diode is provided between at least two terminal plates.

  The above connection structure can be performed by various methods. For example, a plurality of terminal plates to which the electrodes of the solar cell module are connected are arranged in the box body, and a reverse flow is caused between the adjacent terminal plates. In the terminal box for a solar cell module provided with a prevention diode via its legs, the connection end of the leg is applied to the rod-like connection part of the terminal plate, and a sleeve is provided on the outer circumference of the application part in the entire axial length. The sleeve is placed through the slit, and the sleeve is positioned so that the leg is pulled out from the connection portion through the slit, and then the sleeve is fitted into the connection portion and is crimped to connect the leg of the backflow prevention diode to the terminal. A method of connecting to a board can be adopted.

  On the other hand, as a configuration related to the connection between the terminal plate and the electrode wire of the present invention, the terminal box for the solar cell module in which the electrode wire from the solar cell module is connected to the terminal plate to which the external connection cable in the box body is connected. In the electrode wire connection structure, a connection portion of the terminal plate with the electrode wire is formed in a rod shape, and a connection end of the electrode wire is wound around the rod-shaped connection portion, and a sleeve is covered on the outer periphery of the winding portion. The electrode wire is crimped and connected to the terminal plate by the sleeve, and the connection end of the electrode wire is wound around the rod-like connecting portion through the slit of the sleeve.

At this time, similarly to the above, the slit may be in the entire axial length of the sleeve or may be partial. The length of the sleeve is arbitrary and may be any length that can be stopped. For example, the sleeve may be narrower than the electrode wire, but at least has a width (length) covering the entire electrode wire. This is preferable in terms of ensuring connection performance.
The electrode wire is not limited to the flat belt shape shown in the embodiment, and is arbitrary such as a circular cross section. In addition, the terminal plate can be arbitrarily shaped like a rod-like connector or a flat belt as in the above, and the connecting portion with the electrode wire is also a rod-like shape around which the electrode wire can be wound. Any may be used. Furthermore, if the electrode wire connecting sleeve has springiness as described above, the same operation and effect can be obtained.

  This electrode wire connection structure can also be performed by various methods. For example, when connecting an electrode wire from a solar cell module to a terminal plate to which an external connection cable in the box body is connected, the terminal is connected. The connection end of the electrode wire is wound around the rod-shaped connection portion of the plate, and the sleeve is covered with a sleeve over the entire length of the winding portion through the slit, and the sleeve is pulled out from the connection portion of the electrode wire through the slit. In addition, various means for connecting the sleeve to the connecting portion, for example, a structure in which the electrode wire is connected to the terminal plate by being crimped by the spring property of the sleeve can be employed.

  Since the present invention is configured as described above, the diode leg or electrode wire and the terminal plate can be easily connected with sufficient strength, and can be easily performed in the field.

  One embodiment is shown in FIG. 1 to FIG. 7, and this embodiment is a plan view of a solar cell module M in a long rectangular box body 11 made of polyphenylene oxide (PPO) resin or polyphenylene ether (PPE) resin having an opening at the top. A pair of pin-shaped (disc-shaped) conductors 12 and 12 serving as a terminal plate to which the strip-shaped positive electrode line a and the negative electrode line a are connected are arranged in parallel. The conductor 12 is inserted when the box body 11 is resin-molded.

  The conductor 12 is connected with the conductor 31 of the external connection cable P fitted into one end thereof, and becomes the connection portion 14a of the diode 13 and the connection portion 14b of the plus electrode line a and the minus electrode line a toward the other end. Yes. The former connecting portion 14a is formed with a cross-sectional arc-shaped groove 16 over the entire circumference. The cable P is fixed to the main body 11 in a watertight manner by screwing the cable lock 32 into the box main body 11.

  As shown in FIGS. 2, 4 and 8, the electrode wire a is connected by winding the electrode wire a from the lower surface opening of the box body 11 to the connecting portion 14b, and as shown in FIG. A spring sleeve 15 having a substantially Ω cross section is fitted into the wound connection portion 14b. The fitting of the sleeve 15 is a state in which the electrode wire a is pressure-bonded to the connection portion 14b due to its spring property, and the electrode wire a is connected to the conductor 12 with an appropriate contact pressure (double-lead joining). At this time, when one or both of the outer peripheral surface of the connection portion 14b and the inner surface of the sleeve 15 are provided with a plurality of sharp protrusions, sharp protrusions, and the like, when a tensile force is applied to the electrode wire a, the protrusions bite. Can withstand the tensile force.

When the connection between the electrode wire a and the terminal box B has to be re-established because the length of the electrode wire a becomes inappropriate due to the change of the arrangement of the solar cell module M, etc. The electrode wire a is removed from the connecting portion 14b with various jigs, the electrode wire a having a required length is wound around the connecting portion 14b, and the sleeve 15 is fitted into the wound connecting portion 14b again. Connection to the conductor 12 is completed. This connection work is easy in the field. In the figure, 15 'is a knob.
The electrode wire a is made of, for example, tin-plated copper, and the conductor 12 is made of a conductive material having high heat dissipation such as a copper alloy such as brass.

Connection of the diode legs 13a, as shown in FIG. 4, fitted with a downwardly arcuate connection end 13a ₁ of the legs 13a extending laterally of the diode 13 in the circumferential groove 16 of the connecting portion 14a (Ategai), 5 As shown in (a) and (b), a spring sleeve 20 having a substantially Ω cross section is fitted into the fitted connecting portion 14a. The fitting of the sleeve 20 is in a state where the leg 13a is pressure-bonded to the connecting portion 14a due to its springiness.

The sleeve 20, as shown in FIGS. 6 and 7, the slits 22 through the connection end 13a ₁ of the legs 13a there is formed from a side edge of the slit (aperture) 21 over its length overall length sleeve circumferentially A slit 23 in the lateral direction is further formed at the tip of the slit 22. If you put leads to connecting end 13a ₁ of the legs 13a into the slit 23, is engaged with the leg 13a is in the slit 23, the leg 13a is hardly disengaged from the sleeve 20. The side slit 22 may be only on the introduction side of the leg 13a.

Further, the axial middle of the sleeve 20 is concave 24 is formed on the inner surface bulges outward over the circumferential direction, by fitting the connection end 13a ₁ of the legs 13a into the concave 24, the sleeve The leg 13a is positioned with respect to 20, and the positioning of the leg 13a with respect to the conductor (terminal plate) 12 is stabilized.
At this time, the legs 13 a are fitted into the recesses 24, so that the inner surface 20 a of the sleeve 20 other than the recesses 24 comes into pressure contact with the connection portion 14 a of the conductor (terminal plate) 12. By this pressure contact, the sleeve 20 is also positioned with respect to the conductor 12, and the mounting state is stabilized. When the above-mentioned leg 13a is introduced into the slit 23, the groove 24 is set at an appropriate position in the axial direction of the sleeve 20 so that the leg 13a fits into the groove 24 at the introduced position. To do.

Further, in the circumferential direction tip end of the slit 22 through which the base end of the connection end 13a ₁ of the legs 13a of the sleeve 20 (the left side slit 22 of FIG. 6 (a)) and protruding pieces 25 facing outwardly is provided, the sleeve 20 When fitted to the conductor 12, it is pressed against the inner surface leg connection end 13a ₁ of the protrusion 25 in the connecting portion 14a, thereby improving the connection strength of the legs 13a and the connecting portion 14a (see Figure 5 (b)). In addition, when this protrusion 25 is formed into the three-dimensional shape shown in (b) to (g) and FIG. 6 from the developed state (punched state) of FIG. Form as raised.

By the action of each part of the sleeve 20 described above, the leg 13a is connected to the conductor (terminal plate) 12 with an appropriate contact pressure. The diode 13 is connected to the conductor 12 at the factory (although it is connected at the time of shipment), it can also be connected at the site.
Also in the connection of the diode 13 to the conductor 12, one or both of the outer peripheral surface of the connecting portion 14a and the inner surface of the sleeve 20 are provided with a plurality of sharp protrusions, sharp ridges, etc. When a tensile force is applied to 13a), it is possible to resist the tensile force by biting the protrusions.

When the connection of the electrode wire a and the diode 13 to the conductor 12 is completed, a cover 18 made of PPO resin or PPE resin is fitted to the upper surface opening of the box body 11 through a waterproof ring 19 to make it waterproof (FIG. 2, (See FIG. 3). The box body 11 is appropriately filled with silicon resin or the like. Thereafter, the terminal box B is fixed to the back surface of the solar cell module M with a tape (not shown) on the back surface (see FIG. 18).
The cable P of each terminal box B is appropriately connected to the female or male connector of the adjacent terminal box B. Each terminal box B is connected in series or in parallel by appropriately selecting the connection mode.

  As described above, if the sleeve 20 has a spring property, the diode leg 13a can be connected (crimped) to the connection portion 14a with the spring property. As shown in FIGS. 8 and 9, the sleeve 20 is plastically deformed as shown by the arrow with a known crimping tool to crimp the leg 13a to the connecting portion 14a. At this time, the concave stripes 24 can be formed by the crimping, but it is not necessary to form them. The shape of the sleeve 20 is arbitrary as long as the leg 13a can be fixed. For example, various modes shown in FIGS. 10 to 12 (a) and (b) are employed. In each of these drawings, the concave stripe 24 can be omitted.

  Similarly, the sleeve 15 for fixing the electrode wire a can also be a non-spring material, and the sleeve 15 for the electrode wire can be a pair of members that fix both sides of the electrode wire a, or can be fixed in the middle. The number and the length are arbitrary, such as the one that is fixed or only the one that fixes only the middle.

The shape of the terminal plate 12 is not limited to the rod-shaped conductor 12 as a whole, and only the connecting portions 14a and 14b may be rod-shaped. The cross-sectional shape of the connecting portions 14a and 14b is not limited to a circular shape, and may be a polygonal shape such as a quadrilateral as long as the leg 13a and the electrode wire a can be attached. In accordance with the rod-like shape, to allow adequate fixation, bent shape of the cross-sectional shape and the leg connection end 13a ₁ of the sleeve 15, 20 is also set as appropriate.

  As an aspect of the terminal box B, the terminal plate 12 is not limited to a parallel arrangement, and the present invention can be adopted even when the terminal box 12 has a series arrangement. For example, as shown in FIGS. 13 to 15, the present invention can also be adopted in a terminal box B in which terminal plates 12 are arranged in series.

  It should be noted that the embodiments disclosed herein are illustrative and non-restrictive in all respects. For example, the number of terminal boards and the number of diodes 13 are illustrative, and The scope is defined by the scope of the claims, and is intended to include any modifications within the scope and meaning equivalent to the scope of the claims.

Partially cutaway front view of one embodiment XX sectional view of FIG. YY sectional view of FIG. (A) is a partial perspective view for explaining connection of a diode leg, (b) is a cross-sectional view of an electrode line connecting portion of (a). It is the enlarged view of the connection part of the diode leg, (a) is a partial front view, (b) is a ZZ line sectional view of (a). The sleeve of the embodiment is shown, (a) is a perspective view from the left side, (b) is a perspective view from the right side. The sleeve is shown, (a) is a state of punching before molding, (b) is a front view after molding, (c) is a plan view, (d) is a left side view, and (e) is a right side view. , (F) is the bottom view, and (g) is the cut right side view. The perspective view of the principal part for explaining the fitting operation of the diode leg sleeve of the other embodiment The diode leg connection part of the embodiment is shown, (a) is a partial front view, (b) is a VV line sectional view of (a). It is a fitting operation | movement figure of the sleeve for diode legs of other embodiment, (a) is a perspective view before fitting (attachment), (b) is a perspective view after attachment. The sleeve of other embodiment is shown, (a) is a perspective view before fitting (attachment), (b) is a perspective view after attachment. Furthermore, the sleeve of other embodiment is shown, (a) is a perspective view before fitting (attachment), (b) is a perspective view after attachment. Exploded perspective view of another embodiment Cut front view of the same embodiment Bottom view of the same embodiment Schematic diagram of solar power generation system Illustration of installation of terminal box to solar cell module (A) is a plan view of a conventional example, (b) is a longitudinal sectional view thereof.

Explanation of symbols

1, 11 Box body 2, 12 Terminal board (conductor)
3, 13 Backflow prevention diode 13a Diode leg 13a ₁ Diode leg connection end 14a Diode connection part 14b Electrode line connection part 15 Electrode line attachment sleeve 16 Diode connection part groove 20 Diode leg attachment sleeves 21, 22 Same sleeve Slit 23 of the same sleeve Horizontal slit 24 of the same sleeve Concave strip 25 of the same sleeve Projection piece a of the sleeve Electrode wire a of the solar cell module ₁ Connection end B of _one electrode wire Terminal box M Solar cell module P External connection cable

Claims (9)

A plurality of terminal plates (12) to which the electrode (a) of the solar cell module (M) is connected are disposed in the box body (11), and a backflow preventing diode is provided between the adjacent terminal plates (12). A diode connection structure in which the legs (13a) in the terminal box (B) for solar cell module provided with (13) via the legs (13a) are connected to the terminal plate (12),
The connection between the legs (13a) of the terminal board (12) (14a) becomes a bar-like, its connecting end of said rod-like connecting portion (14a) the legs (13a) (13a ₁₎ is We are against The sleeve (20) is put on the outer periphery of the applied portion and crimped, and the leg (13a) is crimped and connected to the terminal plate (12) by the sleeve (20), and the sleeve (20) A diode connection structure for a terminal box for a solar cell module, wherein the connection end (13a ₁ ) of the leg (13a) is applied to the rod-like connection portion (14a) through a slit (21, 22).   The diode connection structure for a terminal box for a solar cell module according to claim 1, wherein a recess (24) into which the leg (13a) is fitted is formed on an inner peripheral surface of the sleeve (20).   By fitting the leg (13a) to the concave line (24), the inner surface (20a) of the sleeve (20) other than the concave line (24) comes into pressure contact with the rod-like connecting part (14a) of the terminal plate (12). The diode connection structure of the terminal box for solar cell modules according to claim 2. The rod-like connecting portion (14a) of the terminal plate (12) and the leg (13a) are connected so that their length directions intersect with each other, and the sleeve (20) has a slit (21) extending over its entire length direction. A slit (22) formed so that the connecting end (13a ₁ ) of the leg (13a) extends in the sleeve circumferential direction from the side edge of the slit (21). The diode connection structure of the terminal box for solar cell modules in any one of. A lateral slit (23) is further formed at the circumferential tip of the slit (22) through which the connecting end (13a ₁ ) of the leg (13a) passes, and the connecting end of the leg (13a) is formed in the slit (23). diode connection structure of the solar cell module terminal box according to claim 4, characterized in that put lead to (13a _1). A protruding piece (25) facing outward is provided at the circumferential tip of the slit (22) through which the connecting end (13a ₁ ) of the leg (13a) passes, and the inner surface of the protruding piece (25) is provided on the leg (13a). The diode connection structure for a terminal box for a solar cell module according to claim 4 or 5, wherein the structure is applied. The diode connecting structure for a terminal box for a solar cell module according to claim 6, wherein the projecting piece (25) is applied to the base end side of the connecting end (13a ₁ ) of the leg (13a). The sleeve (20) is formed of a spring member in which the slits (21, 22) are formed over the entire length in the axial direction, and the sleeve (20) is widened through the slit (21) so that the leg ( The connecting end (13a ₁ ) of 13a) is fitted into the rod-like connecting portion (14a) to which the connecting end (13a ₁ ) is applied, and the connecting end of the leg (13a) is connected to the rod-like connecting portion (14a) by the spring property of the sleeve (20). The diode connection structure for a terminal box for a solar cell module according to any one of claims 1 to 7, wherein (13a ₁ ) is crimped and connected. A plurality of terminal plates (12) to which the electrode (a) of the solar cell module (M) is connected are disposed in the box body (11), and a backflow preventing diode is provided between the adjacent terminal plates (12). A diode connection method for connecting the leg (13a) to the terminal plate (12) in the terminal box (B) for solar cell module provided with (13) via the leg (13a),
The connecting end (13a ₁ ) of the leg (13a) is applied to the rod-like connecting part (14a) of the terminal plate (12), and the sleeve (20) is placed on the outer periphery of the applied part at the slit ( 21), and the sleeve (20) is positioned so that the leg (13a) is pulled out from the connecting portion (14a) through the slits (21, 22), and then the sleeve (20) is connected to the sleeve (20). A method for connecting diodes in a terminal box for a solar cell module, wherein the legs (13a) of the backflow prevention diode (13) are connected to the terminal plate (12) by being fitted into a part and crimped.

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