JP2009206416A - Terminal box for solar cell module - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable easy connection between electrode lines a from a solar cell module and terminal plates 12 even in a site. <P>SOLUTION: In a terminal box B for a solar cell module, a plurality of terminal plates 12 connected with electrode lines a of the solar cell module are disposed in a box body 11, and a diode 13 for the prevention of a reverse current is provided between the adjacent terminal plates. The electrode lines are overlapped with the terminal plates, the overlapped connection parts are pressed by rocking pushing levers 20, and the pushing levers are engaged with associated hooks 19 for fixing. At this time, the rotary operation of each lever is easy and it is only required to terminate the pushing action of the electrode lines at the end of the rotary operation for engagement with the hooks. Line pushing work can be performed easy, a pushing force can be made sufficient, and sufficient connection can be secured. The connecting work can be made easy even in the site. <P>COPYRIGHT: (C)2009,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 more particularly to an electrode wire of the solar cell module and a backflow prevention diode The present invention relates to a connection structure with a connection terminal board.

  As shown in FIG. 10, the solar cell system includes a solar cell panel (solar cell module) M arranged on the roof of a house, and various electric devices from the module M through a junction box Q, an inverter R, and a distribution board S. E is powered. The solar cell modules M are all arranged so as to be flush with each other, 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.

The terminal box B generally includes a pair of terminal plates 2 to which a positive electrode line a and a negative electrode line a of a solar cell module M are connected, as shown in FIG. 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, and other means such as pressure welding and crimping are employed.

The connection means by soldering is generally troublesome and is generally performed at the factory at the time of shipment. However, in some cases, the length of the electrode wire a due to the change in the arrangement of the solar cell module M becomes inappropriate, so that it may be necessary to reconnect. 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 addition, the means for pressure welding and pressure bonding can be connected in the field, but the conventional work requires a special tool and is complicated.

  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 pressing (pressing) the electrode wire on the terminal board.
Since connection by a presser is generally an easy operation, it can be easily performed on site.
Next, according to the present invention, the press is performed by a lever provided rotatably on the box body, and the press state is maintained by locking the lever to a hook of the box body.
It is easy to rotate the lever, and at the end of the rotation, the operation of pressing the electrode wire to the terminal board can be terminated and locked to the hook, and the operation is easy and sufficient pressing force is easy. Can be obtained, and sufficient connectivity can be secured.

  As a configuration of the present invention, a plurality of terminal plates to which the electrode wires of the solar cell module are connected are disposed in the box body, and a backflow prevention diode is provided between the adjacent terminal plates. In the terminal box, a presser lever that swings toward the connection portion between the terminal plate and the electrode wire is rotatably provided on the box body, the electrode wire is overlapped on the terminal plate, and the presser lever is placed on the overlapped connection portion. It is possible to adopt a configuration in which the pressing lever is locked to the hook of the box body and the pressing and holding state is fixed.

  In this configuration, it is preferable to improve the pressing force by providing a spring piece for pressing the connecting portion on the contact surface of the pressing lever with the connecting portion. At this time, if the spring piece is bulged toward the connection part side of the electrode wire and its both ends are locked to the claw of the presser lever, it can be easily attached. is there.

Various types of presser levers can be considered. For example, the terminal plate has a rotary shaft at one end on one side of a plate-like main body, and the rotary shaft is fitted to a bearing of the box main body. It is possible to adopt a configuration in which the box main body is rotatably provided so as to swing toward the connecting portion of the electrode wire.
In order to fit the rotary shaft to the bearing, when the bearing or the rotary shaft is made of a material that can bend such as a synthetic resin, well-known means such as bending and forcibly fitting them can be adopted. Can be fitted into the bearing from its opening. At this time, various means can be considered to prevent the opening from being released from the opening.For example, when the opening is directed to the hook and the presser lever is locked to the hook, it is locked to the hook. Thus, it is possible to have a protrusion or the like that prevents the rotation shaft from moving out of the opening.

  In this configuration, the position of the hook is arbitrary as long as it can be engaged with the presser lever. For example, the position corresponding to the front edge of the plate-shaped body, the position corresponding to both side edges on the other side of the plate-shaped body Etc. are considered. In the case of the position corresponding to both side edges on the other side end, hooks are provided in pairs so as to be engaged with both side edges on the other side end of the plate-like body, and the presser levers are spread between the pair of hooks. The hook can be locked.

Various tools such as a flat-blade screwdriver can be used as an unlocking tool for releasing the lock between the presser lever and the hook of the box body. For example, a pair of hooks at the corresponding positions on both side edges of the presser lever Provided that the presser lever spreads between the pair of hooks and engages with the pair of hooks, and has a plate-like shape inserted between the pair of hooks. When inserted between a pair of hooks, it is possible to adopt a structure in which the hook is bent in a direction away from the presser lever and released from the presser lever, with both sides contacting the hooks. .
When the lock is released, push up the presser lever with a bar material such as a hand or a flat-blade screwdriver. When the presser lever is released from the hook, the terminal plate and electrode wire are overlapped. The upper surface of the part is opened, and the work to the connecting part, for example, the reconnection of the electrode wire can be performed.

  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.

  An embodiment is shown in FIGS. 1 to 7, and this embodiment is a flat band-like shape of the solar cell module M in a rectangular box body 11 made of polyphenylene oxide (PPO) resin or polyphenylene ether (PPE) resin at the top opening. Two pairs of terminal plates 12 (four terminal plates 12) to which the plus electrode line a and the minus electrode line a are connected are arranged in parallel. The electrode wires a and a are connected to one end 12a of the terminal plate 12 through a through hole 11a (see FIG. 3). Between each adjacent terminal board 12, a backflow prevention (bypass) diode 13 is provided. The electrode wire a is made of, for example, tin-plated copper, and the terminal plate 12 is made of a conductive material having high heat dissipation such as a copper alloy such as brass.

  As shown in FIG. 5, the terminal plate 12 has a heat radiation / heat transformer plate 14 for heat radiation action and heat uniformity on both side edges thereof, and a plurality of terminal plates 12 for improving connectivity with the electrode wire a at one end 12a. A strip-raised portion 15a is formed, and a connecting crimp portion 15b having a U-shaped cross section with the external connection cable P is formed at the other end 12b.

  The terminal plate 12 is fixed to the box main body 11 with screws 17 while the presser fittings 16 a and 16 b are applied to the upper and lower surfaces of the terminal plate 12 and fitted into the protrusion 11 b of the box main body 11. At this time, the screw 17 is screwed into a nut 17 a embedded in the box body 11. Further, a recess 16a ′ is formed in the upper holding metal fitting 16a, and the leg 13a of the diode 13 is inserted into the recess 16a ′, and the diode 13 is fixed and held by the recess 16 ′ to be connected to the terminal plate 12. Connected to. The lower holding metal fitting 16b is for reinforcement at the time of screwing. Further, the fitting hole 14 a on the side surface of the heat dissipation / heat transformer plate 14 is engaged with the hook piece 11 c of the box body 11.

One end 12 a of the terminal plate 12 is bent in an L shape and a portion having the cut and raised portions 15 a is located on the connection seat 11 d of the box body 11. The electrode wire a is guided onto the terminal plate one end 12a on the connection seat 11d.
A pair of bearings 18 and 18 are provided on the left and right sides (inner side) on the rear side (inside) of the connection seat 11d of the box body 11, and a holding lever 20 for connecting the terminal plate 12 (one end 12a) and the electrode wire a is provided on the bearing 18. It can be mounted freely.

  As shown in FIG. 6, the presser lever 20 has rotating shafts 22 and 22 at one end of the plate-shaped main body 21, and the rotating shaft 22 is fitted to the bearing 18 of the box main body 11 (FIG. 5). (See FIG. 7). The terminal plate 12 is swung toward the connection portion between the electrode wire a and the hook 19 of the box body 11 (see FIG. 7). At this time, the rotating shaft 22 is fitted into the bearing 18 with the opening 18a (see FIG. 5), and when swinging, the rotating shaft 22 is pushed rearward with respect to the bearing 18 so as not to be detached from the bearing 18 (rotating shaft). 22 does not come out of the hole of the bearing 18). After locking with the hook 19, the presser lever 20 is positioned with the protrusion 21a on its side locked to the side surface (lower side in FIG. 5) of the hook 19 (see the chain line in FIG. 7), and the protrusion 21a. And the hook 19 and the urging force of the spring piece 23 described below prevent the detachment from the bearing 18.

  A spring piece 23 is provided on the back surface (contact surface with the electrode wire a) of the presser lever 20, and the spring piece 23 bulges toward the connecting portion side with the electrode wire a and both ends thereof are pressed levers. 20 is engaged with the claw 24 and attached to the presser lever 20 (see FIGS. 6A to 6B). The spring piece 23 is also cut and raised 23a. For this reason, as shown in FIG. 7, in a state where the presser lever 20 is pushed over the connecting portion in which the electrode wire a is overlapped with the terminal plate 12 and locked to the hook 19 (see the chain line in FIG. 7, see FIG. 3). Both the cut-and-raised portions 15a and 23a of the plate end 12a and the spring piece 23 bite into the electrode wire a to firmly fix the electrode wire a and ensure a stable connection state.

  Two external connection cables P are connected to both lower ends of the box body 11 (lower side in FIG. 1). The cables P are respectively crimped to the crimping portions 15b on the terminal plates 12 at both ends where the conductors are arranged in parallel. And is fixed to the box body 11 by a cable lock 31. A male connector 35 or a female connector 36 is provided at the other end of the cable P, and these female or male connectors 35, 36 are connected to the male or female connectors 35, 36 of the adjacent terminal box B.

  A cover 37 made of PPO resin or PPE resin is fitted to the upper surface opening of the box body 11 via a waterproof ring 38 to make it waterproof. At this time, the cover 37 is locked and fixed to the claw 11e of the box body 11. The box body 11 is appropriately filled with silicon resin or the like. The back surface of the box body 11 is textured, and the terminal box B is fixed to the back surface of the solar cell module M with an adhesive tape (not shown) on the back surface. In FIG. 1, reference numeral 39 denotes a metal filter that allows air to pass but prevents intrusion of liquids such as water, and prevents the saturated water vapor from staying in the box body 11 due to an increase or decrease in temperature.

  The terminal box B of this embodiment is attached to the back surface of the module M by adhesive bonding while maintaining the watertightness of the sealing material, and the cable P of each terminal box B is connected to the female or male connector 35, 36 of the adjacent terminal box B. Connect as appropriate. Each terminal box B is connected in series or in parallel by appropriately selecting the connection mode.

  When the connection between the electrode line a and the terminal box B has to be re-established because the length of the electrode line a is inappropriate due to the change of the arrangement of the solar cell module M, etc. With the tool 40, the press lever 20 and the hook 19 are unlocked, and the press lever 20 is swung upward to release the pressure contact between the electrode wire a and the terminal plate 12 (12a).

  The locking release tool 40 is plate-shaped as shown in FIG. 8, and has a projecting piece 41 at its front end. In order to release the lock between the presser lever 20 and the hook 19 with the locking release tool 40, the protruding piece 41 is inserted between the hooks 19 and 19 as shown in FIG. With the both side surfaces 42 of the projecting piece 41, the hook 19 is bent in a direction away from the presser lever 20 as shown by a solid line to a chain line in FIG.

At this time, as shown in FIG. 6C, the projecting pieces 41, 41 at both ends on the outer side are engaged with the adjacent hooks 19, the locking release tool 40 is positioned, and the inner hooks 19, 19 are pressed against the presser lever. Keep away from 20.
If the hook 19 is disengaged from the presser lever 20, a bar 45 such as a flathead screwdriver is inserted between the presser lever 20 and the connection seat 11d of the box body 11 as shown in FIG. The presser lever 20 is raised to release the pressure contact between the electrode wire a and the terminal plate 12 (12a). In this open state, work such as replacement of the electrode wire a is performed.

  It should be noted that the embodiments disclosed this time are examples in all respects and should not be considered as restrictive. For example, the number of terminal boards, the number of diodes 13 and the like are examples, 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.

(A) is a front view of one embodiment, (b) is a side view thereof, and (c) is a bottom view of the same part cut. Partially omitted view with the lid of FIG. 1 (a) removed. XX sectional drawing which covered the cover in FIG. YY sectional view taken on the line in FIG. Partially exploded perspective view of the same embodiment The presser lever of the same Example is shown, (a) is a disassembled perspective view, (b) is a perspective view, (c) is a rear perspective view. Action diagram of the presser lever The latch release tool of the Example is shown, (a) is a front view, (b) is a perspective view. The lock release action of the presser lever 20 and the box body hook 19 by the lock release tool is shown, (a) is a front view, (b) is a left cut side view, and (c) is an enlarged action view of (a). Schematic diagram of solar power generation system (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 plate 3, 13 Backflow prevention diode 13a Backflow prevention diode lead leg 18 Presser lever support bearing 19 Presser lever locking hook 20 Presser lever 21 Presser lever body 22 Rotating shaft 23 Spring piece 24 Claw 40 for locking the spring piece of the presser lever 40 Unlocking tool 41 Projection piece 42 Notch a Solar cell module electrode wire B Terminal box M Solar cell module P External connection cable

Claims (7)

In the box body (11), a plurality of terminal plates (12) to which the electrode wires (a) of the solar cell module (M) are connected are arranged, and for backflow prevention between the adjacent terminal plates (12). In the solar cell module terminal box (B) provided with the diode (13),
A presser lever (20) that swings toward the connection between the terminal plate (12) and the electrode wire (a) is provided rotatably on the box body (11), and the electrode wire (a ), And the presser lever (20) is swung and pushed over the overlapped connecting portion, and the presser lever (20) is locked to the hook (19) of the box body (11) to push the pile. A terminal box for a solar cell module, characterized in that the state is fixed.   The terminal box for a solar cell module according to claim 1, wherein a spring piece (23) for pressing the connecting portion is provided on a contact surface of the pressing lever (20) with the connecting portion.   The spring piece (23) is attached to the presser lever (20) with its center part bulging toward the connecting part side and engaging both ends with the claws (24) of the presser lever (20). The terminal box for a solar cell module according to claim 2, wherein the terminal box is a solar cell module.   The presser lever (20) has rotating shafts (22, 22) at both ends of one side of a plate-like body (21), and the rotating shaft (22) is a bearing (18) of the box body (11). The box main body (11) is rotatably provided so as to swing toward the connecting portion of the terminal plate (12) and the electrode wire (a) by being fitted to the terminal plate (12). The terminal box for solar cell modules in any one of 3.   The hooks (19) are provided in pairs so as to be engaged with both side edges on the other end of the plate-like body (21) of the presser lever (20), and the presser lever (20) is a hook of the pair. The terminal box for a solar cell module according to claim 4, wherein the space between (19, 19) is extended and locked to the pair of hooks (19, 19).   The rotating shaft (22) is fitted into the bearing (18) from the opening (18a) facing the hook (19), and the presser lever body (21) is locked to the hook (19) by the presser lever (20). The projection (21a) has a protrusion (21a) that is locked to the hook (19) to prevent the rotation shaft (22) from moving out of the opening (18a). The terminal box for solar cell modules as described. An unlocking tool (40) for unlocking the presser lever (20) and the hooks (19, 19) of the box body (11) in the solar cell module terminal box according to claim 5 or 6. And
When the plate is inserted between the pair of hooks (19, 19) and inserted between the pair of hooks (19, 19), the hooks (19, 19) The hooks (19, 19) are bent in the direction away from the presser lever (20) by the both side surfaces (42, 42) in contact with each other, and the engagement with the presser lever (20) is released. Unlocking tool.

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