KR101611435B1 - Junction box for Solar cell panel - Google Patents

Abstract

Disclosed is a junction box for a solar panel, which is equipped with a diode block to facilitate replacement or repair of a bypass diode. Wherein the junction box comprises a housing having a housing space therein and a diode block inserted and detachably coupled to a front surface of the housing and connected to the output bus bar and a diode block electrically connecting the cable, The diode block includes a cover, a plurality of connectors housed and fixed in the cover, and a plurality of bypass diodes electrically connecting the connectors in parallel.

Description

Junction box for solar cell panel [

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a junction box for a solar cell panel, and more particularly to a technique capable of facilitating replacement or repair of a bypass diode by providing a diode block.

Solar panels used for solar power generation are manufactured in a module form in which a plurality of solar cells are arranged in a package in accordance with required characteristics such as the capacity of a battery.

In the solar cell panel, the solar cells are electrically connected to each other by a ribbon cable, and the end portion of the ribbon cable is connected to the connection terminal of the junction box mounted on the back surface of the solar panel.

The junction box is a device for collecting electric power generated by a plurality of solar cell panels and supplying them to the power grid.

Patent documents related to the junction boxes include, for example, US 7,097,516, US 7,285,006, US 2008/0110490, Korean Patent Publication No. 2011-89559, or Korean Patent No. 0981362, and the like.

According to these prior arts, a plurality of ribbon cable connection terminals for connecting the ends of the ribbon cables drawn from the solar cell panel are provided in the junction box, and bypass diodes are provided between neighboring ribbon cable connection terminals And bypasses the reverse current flowing into the junction box from an electrical system such as an inverter connected to the next stage of the junction box.

However, when the bypass diode is fastened to the housing by a screw and is connected to the ribbon cable connection terminal by soldering, the depth of the housing is narrow and the space is narrow and workability is poor. Since the width of the ribbon cable connection terminal is narrow, There is a problem in that there is a high possibility that the diodes are separated.

Further, in order to replace the bypass diode, the junction box itself must be separated from the solar panel, so that it takes much time to replace the bypass diode and the workability is deteriorated.

In addition, the structure for fixing the bus bar terminal connected to the output bus bar of the solar panel or the connection terminal connected to the cable is complicated and the sealing force inside the case is lowered according to the accuracy of assembly, There is a problem.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a junction box for a solar panel that can reduce the time required for replacing a bypass diode, thereby improving workability.

Another object of the present invention is to provide a junction box for a solar cell panel in which the bonding strength of the bypass diode is improved.

Another object of the present invention is to provide a junction box for a solar cell panel in which a bus bar terminal and a connection terminal can be firmly fixed to a housing with a simple structure.

The object of the present invention is achieved by a solar cell module comprising: a housing having an output bus bar and a cable interposed therebetween, electrically connected to each other and having a storage space therein; a bus inserted into and detachable from a front surface of the housing, And a diode block electrically connecting the terminal and the cable, wherein the diode block includes a cover, a plurality of connectors housed and fixed in the cover, and a plurality of bypass diodes electrically connecting the connectors in parallel And a junction box for a solar cell panel.

Preferably, the connector includes a side wall protruding from both ends in the width direction of the bottom, and a contact portion protruding from both ends in the longitudinal direction, wherein a lead of the bypass diode is seated on the upper end of the side wall to form a groove to be soldered.

Preferably, the cover has a box-like shape with an opened top face, a through groove through which the bus bar and the connection terminal pass is formed at an upper end of an opposing side wall of the cover, And ribs for supporting the connection terminals are formed so as to protrude from the both sides of the ribs, and support pillars are projected from the bottom at both sides of the ribs, and the contact portions of the connectors are sandwiched therebetween.

Preferably, a seating groove is formed on an upper end of a side wall surrounding the storage space, the bus bar terminal and the connection terminal are fixed to the seating groove, and a groove is formed to surround the storage space, And both ends thereof are connected to a lead-in groove for receiving an end portion of the cable, and the groove, the lead-in groove, and the seating groove are filled with hot melt.

According to the above configuration, there is no need to remove the housing from the solar cell panel in order to replace the failed bypass diode, and it is possible to solve the problem by simply replacing the diode block, which is advantageous in workability.

In addition, since the grooves, the lead-in grooves, and the mounting grooves formed around the housing space are filled, the bus bar terminals and the connection terminals can be firmly fixed with a simple structure without a separate fixing device, The connection part can be firmly fixed and the insulation against the outside can be maintained.

In addition, the soldering strength between the bypass diode and the connector can be improved.

FIG. 1 is an exploded perspective view showing a state before assembly of a junction box for a solar cell panel according to the present invention. FIG.
FIG. 2 (a) is a perspective view showing a state in which a junction box for a solar cell panel is assembled, and FIG. 2 (b) is a perspective view showing a state in which a diode block is removed.
3 is an exploded perspective view showing a diode block.
4 is a perspective view showing the combination of the connector and the diode block cover.
5 is a perspective view showing the connector in detail;

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is an exploded perspective view showing a state before assembling a junction box for a solar cell panel according to the present invention, FIG. 2 (a) is a perspective view showing a rear surface of a junction box for a solar cell panel, 2 (b) is a perspective view showing a state in which the diode block is removed.

The housing 100 has two independent areas, one housing space 102 in which the diode block 300 is detachably coupled, and the other housing 102 having a bus bar terminal 104 and a solar cell panel And a connection space 105 to which a bus bar (not shown) is connected. The connection space 105 may not be provided separately.

As shown in FIG. 1, the diode block 300 is fitted from the front surface of the housing 100, and is coupled with a side wall constituting the storage space 102 with a gasket 330 interposed therebetween.

A seating groove 106 and a lead-in groove 101 are formed in a rear surface of the housing 100 at a position where the bus bar terminal 104 and the connection terminal 204 pass through the upper end of the side wall of the storage space 102, (104) and the connection terminal (204) are fixed to each other.

A groove 103 is formed at the upper end of the side wall so as to surround the storage space 102 and is connected to the seating groove 106 and the inlet groove 101 so that the grooves 103, The inlet grooves 101 are filled with hot melt 110.

According to this structure, the bus bar terminal 104 and the connection terminal 204 can be firmly fixed to the housing 100 with a simple structure without a separate fixing device by filling the grooves 103 with the hot melt 110 In addition, the connecting portion can be firmly fixed in the lead-in groove 101, in which the metal core of the cable 200 is connected to the connecting terminal 204, and insulation can be maintained against the outside.

Fig. 3 is an exploded perspective view showing a diode block, and Fig. 4 is a perspective view showing a combination of a connector and a diode block cover.

The diode block 300 includes a cover 310, a connector 320, and a bypass diode 340.

The cover 310 is in the form of a box having an opened upper surface and is forcibly inserted into and engaged with the storage space 102 from the front surface of the housing 100.

The gasket 330 is formed along the side wall of the cover 310 so that the rubber gasket 330 is inserted into the gasket 330. When the cover 310 is forcibly inserted into the accommodating space 102, ) Completely seals the gap between the side wall of the cover 310 and the side wall of the storage space 102 to block foreign substances from entering from the outside.

A passage groove 313 is formed corresponding to the seating groove 106 of the housing 100 along the opening edge of the cover 310 so that the bus bar terminal 104 or the connecting terminal 204 is passed into the receiving space 102 It serves as an incoming pathway.

A pair of ribs 315 for supporting the bus bar terminal 104 and the connection terminal 204 are formed to protrude from the side wall at positions corresponding to the passage grooves 313 on the opposite side walls of the cover 310, Support pillars 314 protrude from both sides of the base 315 so that the contact portion of the connector 320 is sandwiched therebetween.

5 is a perspective view showing the connector in detail;

As described above, the connectors 320 located on both outer sides of the connector 320 electrically connect the bus bar terminal 104 and the connection terminal 204, and the entire connector 320 is connected to the bypass diode 340 In parallel.

The connector 320 is formed of a single body. The side wall 322 protrudes from both ends in the width direction of the bottom 321, and the contact portion 324 protrudes from both ends in the longitudinal direction.

A pair of recesses 323 are formed in the upper ends of the side walls 322, respectively, so that the leads 342 of the diodes 340 are placed and soldered. With this structure, the groove 323 can be filled by the solder during soldering, thereby improving the soldering strength.

The contact portion 324 is separated from the side wall 322 and has elasticity itself, and can be more elastic by folding it in two and having a micro gap. Preferably, the center of the contact portion 324 is somewhat protruded by the press, so that electrical contact with the bus bar terminal 104 and the connection terminal 204 can be improved.

Hereinafter, the assembly of the junction box for a solar cell panel having the above-described structure will be described.

The diode block 300 is assembled so that the contact portion 324 of the connector 320 is sandwiched between the support pillars 314 of the cover 310 to couple the plurality of connectors 320 to the cover 310 do.

The lead 342 of the bypass diode 340 is then placed in the groove 323 of the connector 320 and then soldered and fixed.

The lead 342 of the bypass diode 340 is soldered to the groove 324 of the connector 320 and then the diode 340 and the connector 320 assembled in one body are fixed to the cover 310, Lt; / RTI >

The cover 310 is coupled to the housing 100 by inserting the gasket 330 into the gasket groove 312 formed in the side wall of the cover 310.

On the other hand, the connection terminal 204 is fixed to the lead-in groove 101 and electrically connected to the metal core of the cable 200, and a plurality of bus bar terminals 104 are also fixed to the seating groove 106 of the housing 100 At this time, the connection terminal 204 and the bus bar terminal 104 are supported by the ribs 315.

The hot melt 110 is then filled along the inlet grooves 101 and the grooves 103 and hardened so that the connection terminals 204 and the metal core of the cable 200 are hardened in the inlet grooves 101.

Also, the seating groove 106 is filled so that the bus bar terminal 104 is firmly connected to the housing 100.

Next, the pre-assembled diode block 300 is forcibly inserted into the accommodating space 102 of the housing 100, and then the rear surface of the housing 100 is attached to the solar cell panel through the silicon and adhered thereto And the mounting is completed by fixing.

In order to replace the bypass diode 340, the diode block 300 may be detached from the housing 100, and then the new diode block 300 may be simply inserted into the housing 100, The diode block 300 can be repaired and reused.

As described above, there is no need to remove the housing from the solar cell panel in order to replace the failed bypass diode, and it is possible to solve the problem by simply replacing the diode block, which is advantageous in workability.

In addition, since the grooves, the lead-in grooves, and the mounting grooves formed around the housing space are filled, the bus bar terminals and the connection terminals can be firmly fixed with a simple structure without a separate fixing device, The connection part can be firmly fixed and the insulation against the outside can be maintained.

In addition, the soldering strength between the bypass diode and the connector can be improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments. Accordingly, the scope of the present invention should not be construed as being limited to the embodiments described above, but should be construed in accordance with the following claims.

100: Housing
101: inlet home
102: Storage space
103: Groove
104: bus bar
105: Connection space
106: seat groove
110: hot melt
200: Cable
204: connection terminal
300: diode block
310: cover
320: Connector
330: Gasket
340: Bypass diode

Claims (4)

delete delete delete A junction box for a solar cell panel interposed between and electrically connected between an output bus bar and a cable of a solar panel,
The junction box includes:
A housing having a storage space formed therein and having a front surface and a rear surface;
A bus bar terminal provided on the output bus bar side of the housing; And
And a diode block inserted and detachably coupled to the front surface of the housing,
The diode block includes:
A cover covering a front surface of the junction box;
A plurality of connectors fixedly received in the cover and electrically connecting the bus bar terminals to the connection terminals of the cables; And
And a plurality of bypass diodes electrically connecting the connectors in parallel,
A groove is formed along the upper end of the side wall surrounding the storage space on the rear surface of the housing, a seating groove is formed on the side of the output bus bar of the housing, a recess is formed on the upper side of the side wall, It is connected to the Ubu,
Wherein the grooves, the inlet grooves, and the mounting grooves are filled with hot melt in a state where the bus bar terminals and the connection terminals are respectively mounted in the seating grooves and the inlet grooves. Junction boxes for panels.

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