JP2009283483A - Electrode wire connection structure of terminal box for solar battery module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make it easy to connect an electrode wire a from a solar-battery module M to a terminal board 12 in site. <P>SOLUTION: A terminal box body 11 contains a terminal box B for a solar battery module which arranges terminal boards to which an electrode wire a is connected and forms a reverse-current preventing diode 13 between the terminal boards. The connection end a<SB>1</SB>of the electrode wire is wounded on a rod-shaped connection portion 14 of the terminal board and a spring sleeve 15 is fit into a slit 16 by expanding the slit. The electrode wire is press-bonded and connected to the terminal board using the sleeve 15. The length of the electrode wire a is inappropriate, so that the connection of the electrode wire to the terminal board is completed by taking the sleeve off of the connection portion and rewinding the electrode wire with a required length around the connection portion, and fitting the sleeve into the connection portion when the electrode wire a is reconnected to the terminal board. This connection is easy in site. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a terminal box used when mutually connecting solar cell modules constituting a photovoltaic power generation system that directly converts solar energy into electric energy, and in particular, between the electrode wire and the terminal plate of the solar cell module. The present invention relates to a connection structure and its connection method.

  As shown in FIG. 12, the photovoltaic power generation system has a solar cell panel (solar cell module) M arranged on the roof of a house, and various electric power is supplied 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. 13 and are connected in series or in parallel via the terminal box B. The terminal box B is bonded and fixed to the back surface of the module M while maintaining the watertightness of the sealing material.

As shown in FIG. 14, the terminal box B generally has a pair of terminal plates 2 to which a positive electrode line a and a negative electrode line a of the solar cell module M are connected in a box body 1 having an upper opening. 2 are arranged in parallel, a backflow prevention (bypass) diode 3 is provided between the two terminal plates 2 and 2, and an external connection cable P is connected to each of the terminal plates 2 and 2. (See Patent Document 1 FIGS. 11 and 15). In the figure, 6 is a cover.
Japanese Patent No. 3965418

  In this terminal box B, the connection between the electrode wire a and the backflow prevention diode connecting terminal plate 2 is generally soldered.

  The connection means by soldering is generally troublesome and is generally performed at the factory at the time of shipment. However, there may be a case where the connection between the electrode wire a and the terminal plate 2 has to be made again because 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. 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.

  This invention makes it a subject to make it easy to connect the said electrode wire and a terminal board also in the field in view of said situation.

In order to achieve the above object, according to the present invention, the connection is first made by crimping the electrode wire to the terminal board.
Since connection by crimping is generally an easy operation, it can be easily performed in the field.

Next, according to the present invention, the connecting portion on the terminal plate side of the crimping portion is formed into a rod shape, an electrode wire is wound around the rod-shaped connecting portion, and a sleeve is fitted into the wound portion to be crimped.
Winding of the electrode wire around the rod-like connecting portion is relatively easy even in the field. Moreover, the crimping | compression-bonding of the sleeve to such a wound rod-shaped part is an operation normally performed in electric wire connection, and the operation is also easy.
At this time, the electrode wire wound around the connecting portion is drawn out through the slit of the sleeve. The slit only needs to have a size (length) sufficient for the electrode wire to be drawn out, but it is preferable that the slit be 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 of the present invention, the electrode wire connection structure of the solar cell module terminal box 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, The connection portion of the terminal plate with the electrode wire is formed into a rod shape, and the connection end of the electrode wire is wound around the rod-shaped connection portion, and a sleeve is put on the outer periphery of the winding portion and is crimped. It is possible to adopt a configuration in which the electrode wire is crimped to the plate 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, as described above, the slit may be 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. Also, the terminal board has a rod-like connector shape as a whole (see FIGS. 1 and 2 of the embodiment), or a plate piece (flat band shape) shown in FIGS. 8, 9 and 10 of the above-described conventional example and embodiment. However, the connecting portion with the electrode wire has a rod shape around which the electrode wire can be wound.

The sleeve may be a general one that is plastically deformed by a crimping jig, but as a clip-like member made of a spring member in which an axial slit is formed, the sleeve is spread through the slit to form an electrode. The connecting end of the wire is fitted into the wound rod-shaped connecting portion, and the connecting end of the electrode wire can be crimped and connected to the rod-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.

  Further, the number of terminal plates is arbitrary, and in the case of a plurality of terminal plates, a backflow prevention diode may or may not be provided between the adjacent terminal plates. obtain.

  This connection structure can be performed by various methods. For example, when connecting the electrode wire from the solar cell module to the terminal plate to which the external connection cable in the box body is connected, the rod shape of the terminal plate is used. The connection end of the electrode wire is wound around the connection portion, and the sleeve is put on the outer periphery of the winding portion via the slit over the entire length, and the sleeve is positioned so as to be drawn out from the connection portion of the electrode wire through the slit, Various means to the connection part of the sleeve, 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 connection between the electrode wire and the terminal plate can be easily performed on site.

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 conductors 12 and 12 serving as a terminal plate to which the belt-like plus electrode line a and minus electrode line a are connected are arranged in series.
The conductor 12 includes a contact fixing ring 12a and a mini contact 12b. A leg 13a of a backflow prevention (bypass) diode 13 is press-fitted into the former contact fixing ring 12a, and the latter mini contact 12b is externally connected. The connector pin 21 of the connection cable P is inserted and connected. The external cable P to which the connector pin 21 is inserted and connected is fixed to the main body 11 in a watertight manner by screwing the cable lock 22 into the box main body 11.

The diode 13 side of the contactor fixing ring 12a of the conductor 12 is a connecting portion 14 in the shape of a rod, and the positive electrode line a and the negative electrode line a are respectively connected to the connecting portion 14 of both contactor fixing rings 12a. Connected.
As shown in FIG. 5 (a), the electrode wire a is led from the lower surface opening of the box body 11 to the connecting portion 14 and wound as shown in FIG. 5 (a), and the wound connection as shown in FIG. 5 (b). A spring sleeve 15 having a substantially Ω cross section is fitted into the portion 14. The fitting of the sleeve 15 is a state in which the electrode wire a is crimped to the connection portion 14 due to its spring property, and the electrode wire a is connected to the conductor 12 with an appropriate contact pressure (tab lead joining).

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 14 with various jigs, the electrode wire a having a required length is wound around the connecting portion 14, and the sleeve 15 is fitted into the wound connecting portion 14 again. Connection to the conductor 12 is completed. This connection work is easy in the field.
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.

When the connection of the electrode wire a 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 (see FIG. 4). The box body 11 is appropriately filled with silicon resin or the like. Thereafter or before, the external cable P is connected to the conductor 12 and fixed with the cable lock 22. The terminal box B after these operations are fixed to the back surface of the solar cell module M with a tape (not shown) on the back surface (see FIG. 13).
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 shown in FIG. 6, the sleeve 15 is a pair that fixes both sides of the electrode wire a, three that fix the middle of the sleeve 15, or only one that fixes only the middle. The number and length are arbitrary.
Further, as described above, if the sleeve 15 has a spring property, the electrode wire a can be connected to the connecting portion 14 with the spring property (it can be crimped), but the sleeve 15 is in a material having no spring property. As shown in FIG. 7, the sleeve 15 is plastically deformed as shown by an arrow to crimp the electrode wire a to the connecting portion 14 with a known crimping tool. The shape of the sleeve 15 is arbitrary as long as the electrode wire a can be fixed. For example, the sleeve 15 may be provided with a knob 15 'shown in FIG.
Furthermore, in the embodiment, the slit 16 (see FIG. 5) is provided over the entire length, but before the diode 13 is inserted into the conductor 12, the sleeve 15 that does not have the slit 16 over the entire length can be fitted into the connection portion 14. it can. In this case, the electrode wire a is wound around the connection portion 14 through the partial slit 16, the sleeve 15 is pressure-bonded by plastic deformation, and the sleeve 15 is inserted into the conductor 12.

  The shape of the terminal plate 12 is not limited to the conductor 12 having a rod shape as a whole. For example, as shown in FIG. 8, a plate shape similar to that described above is conceivable. In this case, the connection portion 14 is formed by winding the electrode wire a. A rod shape that can be rotated, for example, a circular rod shape, a square rod shape, or the like. The cross-sectional shape of the sleeve 15 is appropriately set so that appropriate fixing can be performed in accordance with the rod-like shape.

  As an aspect of the terminal box B, the present invention can be adopted not only when the terminal plate 12 is arranged in series but also when the terminal board 12 is arranged in parallel. For example, as shown in FIG. 9, even in a terminal box B in which a plurality of terminal plates 12 are arranged in parallel, for example, as shown in FIGS. 10 (a) and 10 (b), a rod-like connecting portion 14 is provided on each terminal plate 12. Then, the electrode wire a is wound around the connecting portion 14, and the sleeve 15 is fitted and connected to the wound connecting portion 14. Further, the present invention can also be adopted in the terminal box B shown in FIG.

In each of the above embodiments, the diode 13 is connected to the terminal plate 12 by the legs 13a. However, the present invention can be adopted even if the main body is directly connected. In the case of connection by the legs 13a, known means such as soldering to the terminal board 12 and fitting into the groove of the terminal board 12 can be employed.
Moreover, although each said embodiment was the terminal box B which provided the diode 13 for backflow prevention, in the aspect which connected each terminal board (conductor) 12 in series or in parallel, without providing the diode 13. FIG. Of course, the present invention can be adopted.

  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.

Exploded perspective view of one embodiment Cut front view of the same embodiment Bottom view of the same embodiment 2A is a cross-sectional view taken along line XX in FIG. 2, and FIG. FIG. 3 is an operation view of fitting the sleeve of the embodiment, (a) is a perspective view of the main part, and (b) is a sectional view of the same. The perspective view of the main part of the fitting operation of the sleeve of the other embodiment It is a fitting operation | movement figure of the sleeve of other embodiment, (a) is a principal part perspective view, (b) is the same sectional drawing. It is a fitting operation | movement figure of the sleeve of other embodiment, (a) is a principal part perspective view, (b) is the same sectional drawing. Perspective view of another embodiment It is a fitting operation | movement figure of the sleeve of other embodiment, (a) is a principal part perspective view of an example, (b) is the same sectional view, (c) is a principal part perspective view of another example. Other embodiments are shown, (a) is a front view with the lid removed, (b) is a cut right side view, and (c) is a cut bottom view. 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

・ 11 Box body ・ 12 Terminal board (conductor)
13 Backflow prevention diode 14 Connection portion 15 Sleeve 16 Slit of sleeve a Electrode wire a of solar cell module a Connection end B of _one electrode wire Terminal box M Solar cell module P External connection cable

Claims (4)

Solar cell module terminal box (B) in which the electrode wire (a) from the solar cell module (M) is connected to the terminal plate (12) to which the external connection cable (P) in the box body (11) is connected. A connection structure of the electrode wire (a),
Connection between the electrode line (a) of the terminal plate (12) (14) becomes a bar-like connection end _{(a 1)} is wound in the rod-like connection portion and the electrode line (14) (a) Then, the sleeve (15) is put on the outer periphery of the winding portion and crimped, and the electrode wire (a) is crimped and connected to the terminal plate (12) by the sleeve (15), and the sleeve (15) The connection end (a ₁ ) of the electrode wire (a) is wound around the rod-like connection portion (14) through the slit (16) of the solar cell module terminal box. The sleeve (15) is composed of a spring member in which the slit (16) is formed over the entire axial length of the sleeve (15), and the sleeve (15) is expanded through the slit (16) so that the electrode wire (a The connecting end (a ₁ ) of the electrode wire (a) is fitted into the wound rod-shaped connecting portion (14), and the connecting end of the electrode wire (a) is connected to the rod-shaped connecting portion (14) by the spring property of the sleeve (15). The electrode wire connection structure of the terminal box for a solar cell module according to claim 1, wherein (a ₁ ) is crimped and connected.   The solar cell module according to claim 1 or 2, wherein a plurality of the terminal plates (12) are provided, and a diode (13) is provided between the adjacent terminal plates (12, 12). Electrode wire connection structure of terminal box. Solar cell module terminal box (B) for connecting the electrode wire (a) from the solar cell module (M) to the terminal plate (12) to which the external connection cable (P) in the box body (11) is connected. A method of connecting the electrode wire (a),
The connection end (a ₁ ) of the electrode wire (a) is wound around the rod-shaped connection portion (14) of the terminal plate (12), and the sleeve (15) is wound around the outer periphery of the winding portion along the entire length in the axial direction ( 16), and the sleeve (15) is positioned so that the electrode wire (a) is drawn out from the connecting portion (14) through the slit (16), and the connecting portion (14) of the sleeve (15) is placed. The electrode wire (a) is connected to the terminal plate (12) by pressure bonding to the terminal plate (12).

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