KR20190012987A - A method for improving the waterproofness of a solar photovoltaic junction box on the water - Google Patents

Abstract

The present invention relates to a cable fixing method using ultrasonic waves of a solar photovoltaic junction box, which includes: a component mounting step (S1); a cable connection step (S2); a cover/body coupling step (S3); a fixture coupling step (S4); a cable fixing step (S5); a silicon injection step (S6); and a silicon curing step (S7). By applying electrical energy of ultrasonic waves to a connection portion between the junction box and the cable, a joint surface is melted and fixed so that the connection portion is sealed, thereby preventing the electrical connection of the cable from being corroded due to the moisture penetrating into the connection portion. The junction box and the cable can be securely fixed to each other, and the inconvenience caused when the junction box and the cable are fastened by a bolt and a nut can be prevented. Since the cost required for fixing the junction box and the cable can be reduced, the economic efficiency can be improved. It can be used for a long period of time without causing disconnection or bad connection, and has a long service life.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for improving waterproofness of a solar photovoltaic junction box,

The present invention relates to a method for improving the waterproof property of a solar photovoltaic junction box for supplying electricity stably to a solar photovoltaic module for converting solar energy into electric energy And more particularly to a waterproof solar junction box for waterproofing that improves waterproofing by injecting silicone into the junction box by applying electrical energy of ultrasonic waves to the junction box and cable connection site, And the like.

A photovoltaic cell (a solar cell) is one in which photovoltaic power is generated by irradiating a pn junction of a semiconductor with light (Irradiated), and a plurality of such cells are connected in series and in parallel The module is called a junction box and is normally installed behind the module. Inside the junction box, there are bypass diodes (bypass diodes) to prevent reverse current during power generation The connection points and connectors for connecting the cables are built in and are protected by plastic hinges to be shielded from the rough external environment.

Most of the conventional junction boxes currently used have a plurality of connection ports 2 (see FIG. 1), which are fixedly arranged on the bottom plate 1 of the main body A at regular intervals, A bypass diode 3 connected between the extension of the connection port 2 and a lower end of the connection ports 2 on the left and right ends of the connection port 2, A ribbon terminal connected to the lead wire of the photovoltaic cell inserted through the through hole at the back surface of the connection case main body A connected to the upper end of each of the connection ports 2, And a lid (5) covering the connection box main body (A).

The junction box having such a structure is such that the connection ports 4 and 4 'through which the cables are inserted and fixed to the connection terminals in the connection case main body A are fixed to the side surfaces of the junction box by nuts, and the connection ports 4 and 4' It is not sealed and moisture such as rain water penetrates along the connection part of the connection ports (4, 4 ') and the nut. Therefore, the electrical connection part of the cable is easily corroded and broken, There is a problem that components are easily damaged by penetration.

As shown in Figs. 2 to 4, the "sunlight junction box for crystalline modules" of Patent No. 1539653 includes a rectangular window 10b, an upper squeeze clip mount 10d, and a coupling hole 10e , And a bolt (10g, 10g ') having a cable insertion hole (10f, 10f') formed on the left and right of the front side; A metal heat sink (20) mounted with the bypass diode (11) and inserted into the case groove (21) and fixed to the piece (22); A plastic support 30a and a stainless steel clip 30b provided on one side of the plastic support 30a and one end of the plastic clip 30b is inserted into the hinge pin 31. The stainless clip 30b is inserted into the end of the metal heat sink 20 A stainless-steel crimping clip 30 configured to be fixed to the rear case 10 and hung on a hinge pin 31 provided on the rear case 10 to be inserted into an upper end of the metal heat sink 20 to fix the ribbon; And a front case (40) having an integrated lattice structure (41) on a surface thereof coupled to the rear case (10), the photovoltaic junction box for a crystalline module comprising: The rear case 10 includes an inner bottom plate 10c having a plurality of heat dissipating holes 10a and a case groove 21 for mounting a plurality of metal heat dissipating plates 20 therein; An upper squeeze clip mount 10d; A coupling hole 10e formed in the front, rear, left and right sides; And bolts (10g, 10g ') having cable insertion holes (10f, 10f') formed on the right and left sides of the front side; The front case (40) has an integral grid structure (41) and a display part (42) provided on the surface; A coupling hole 40a formed on the front, rear, left and right side surfaces; And protrusions 44 formed to protect the cable fixing nuts 43 inserted into the cable insertion holes 10f and 10f '.

Also in the junction box having such a configuration, since the cable is inserted into the cable insertion holes 10f and 10f 'and then the nut 44 is fastened to the bolts 10g and 10g', the cable is connected to the metal heat sink 20 and fixed Since the cable insertion holes 10f and 10f 'are not sealed, moisture such as rainwater penetrates into the cable insertion holes 10f and 10f', and the electrical connection portion of the cable is easily corroded and broken, There is a problem that moisture penetrates into internal parts and parts are easily damaged.

As a conventional junction box, a solar cell module having a junction box assembly of Patent Publication No. 2017-41303 is disclosed in the patent document. As shown in FIG. 5, the solar cell module having the junction box assembly disclosed in the above-mentioned Patent Publication No. 2017-41303 includes a solar cell panel in which solar cells are arranged in a lattice pattern; A twisted wire box 10 into which a plurality of wires through which a current generated in the solar cell panel flows are introduced; Two terminals 20 provided inside the junction box 10 for sending a current flowing into the twisted wire box 10 to the inverter; A diagnostic circuit for diagnosing the malfunction of the solar cell panel is mounted and two through holes into which the two terminals 20 are inserted are formed. On the inner circumferential surface of the through hole, a current- A diagnostic sensor substrate (30) provided with: And a connecting bracket 40.

Even in the junction box having such a configuration, since the connecting portion of the cable box 10 and the cable can not be sealed, moisture such as rainwater penetrates into the connecting portion of the cable box 10 and the cable, so that the electrical connecting portion of the cable is easily corroded and broken, There was a problem.

As described above, in the conventional junction box, the junction box and the cable are coupled and fixed by the bolt and nut fastening method, so that the connection portion between the junction box and the cable is not sealed, and moisture such as rainwater permeates the connection portion between the junction box and the cable. The electrical connection part of the cable is easily corroded and broken, which causes a trouble. Also, the parts inside the junction box are infiltrated with moisture, so that the parts are easily damaged, and the troubles and manpower required for fastening bolts and nuts are required. There is a problem that the combination of the box and the cable is not robust.

The waterproofness problem of the solar junction box as described above is inevitably a problem that must be solved inevitably due to the fact that a solar photovoltaic (PV) module has been installed in water such as sea.

Patent Document 1: Patent No. 1539653

Patent Document 2: Japanese Patent Application Laid-Open No. 2017-41303

The object of the present invention is to solve the various drawbacks and problems caused by the conventional solar junction box in consideration of the above-mentioned circumstances, and it is an object of the present invention to apply electric energy of ultrasonic waves to a junction box and a cable connection site, To improve the waterproof property of the solar photovoltaic junction box for preventing the breakdown due to disconnection by preventing the electrical connection part of the cable due to the water penetrating into the connection part by injecting silicon into the inside of the body by sealing the connection part by fixing .

Another object of the present invention is to provide a junction box and a cable for connecting and fixing a junction box and a cable by using ultrasonic waves, Thereby improving the water resistance of the junction box.

It is a further object of the present invention to provide a junction box and a cable connection portion by a simple method of applying electrical energy of an ultrasonic wave to a junction box and a cable by coupling and fixing the junction box and the cable, Which can be used for a long period of time without causing disconnection or connection failure while saving the expense of fixing the junction box and the cable to improve the waterproofness of the solar photovoltaic junction box having a long service life Method.

In order to achieve the above object, the present invention provides a method for improving the water resistance of a solar photovoltaic junction box of the present invention, comprising the steps of: forming a bypass diode (11), a metal heat dissipating plate (12) A component mounting step (S1 step) to be mounted; A cable connecting step (S2) of inserting the cable (C) into the cable insertion hole of the cover (10) and connecting the cable (C) to the metal heat sink (12); (Step S3) of inserting the cover 10 into the main body 20 with the part facing the inside of the main body 20; A fixture coupling step (S4) of inserting the cable fixture (30) into the fixture insertion slot (21) of the main body (20); A cable fixing step (S5) of fixing the cable (C) to the main body (10) by applying ultrasonic waves to the connecting portion of the main body (20) and the cable (C) with an ultrasonic welder; A silicon injection step (S6) of injecting silicon into the silicon insertion port 14 of the cover to seal the space inside the cover 10 and the main body 20; And a silicon curing step (S7 step) in which the junction box into which silicon is injected is placed in the atmosphere for 24 to 26 hours to cure the silicon.

The present invention relates to a method and apparatus for bonding and fixing a joint surface by applying electrical energy of ultrasonic waves to a junction box and a cable connection site, and by injecting silicon into the body, the electrical connection of the cable due to moisture, It prevents corrosion caused by disconnection by preventing corrosion of internal parts, and it is not only firmly fixed to the junction box and the cable, but also eliminates the troubles caused by fixing the junction box and the cable by fastening the bolt and nut. It has a remarkable advantage that it can be used economically for a long period of time without causing disconnection or connection failure while reducing the expense of fixing the junction box and the cable.

1 is a perspective view showing the structure of a junction box for a conventional photovoltaic module;
FIG. 2 is an exploded perspective view of a front and rear case according to a conventional photovoltaic junction box for a crystalline module,
3 is an exploded perspective view of a metal heat sink and a metal connection port according to a solar cell junction box for a conventional crystalline module,
4 is a rear view of a rear case according to a conventional solar module for a crystalline module,
5 is a view showing a combination of a terminal and a diagnostic sensor according to an embodiment of a solar cell module having a conventional junction box assembly,
6 is a flowchart of a method for improving the water resistance of the solar photovoltaic junction box of the present invention.
7 is a perspective view of a solar photovoltaic junction box according to the present invention,
8 is an exploded perspective view of a solar photovoltaic junction box according to the present invention,
9 is an exploded perspective view of a solar photovoltaic junction box in a state showing the inside of the cover according to the present invention,
10 is a plan view of a solar photovoltaic junction box according to the present invention,
11 is a perspective view taken along line AA in Fig. 10,
12 is a sectional view taken along the line AA in Fig.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of a method for improving the waterproof property of the solar photovoltaic junction box of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 7 is a perspective view of a solar photovoltaic junction box according to the present invention. FIG. 8 is a perspective view of a solar photovoltaic junction according to an embodiment of the present invention. Fig. 9 is an exploded perspective view of the box, Fig. 9 is an exploded perspective view of the solar photovoltaic junction box in the state showing the inside of the cover according to the present invention, Fig. 10 is a plan view of the solar photovoltaic junction box according to the present invention, 10 is a cross-sectional view taken along the line AA in Fig. 10, and a method for improving the waterproof property of the solar photovoltaic junction box of the present invention includes a bypass diode 11, a metal heat sink plate 12) and a component mounting step (S1 step) of mounting the components of the compression clip 13; A cable connecting step (S2) of inserting the cable (C) into the cable insertion hole of the cover (10) and connecting the cable (C) to the metal heat sink (12); (Step S3) of inserting the cover 10 into the main body 20 with the part facing the inside of the main body 20; A fixture coupling step (S4) of inserting the cable fixture (30) into the fixture insertion slot (21) of the main body (20); A cable fixing step (S5) of fixing the cable (C) to the main body (10) by applying ultrasonic waves to the connecting portion of the main body (20) and the cable (C) with an ultrasonic welder; A silicon injection step (S6) of injecting silicon into the silicon insertion port 14 of the cover to seal the space inside the cover 10 and the main body 20; And a silicon curing step (S7 step) in which the junction box implanted with silicon is allowed to stand in the atmosphere for 24 to 26 hours to cure the silicon.

The connection of the diode 11, the metal heat sink 12 and the compression clip 13 and the metal heat sink 12 and the cable C in the cover 10 is fixed inside the cover 10 by the silicon to be injected .

The cable C connected to the main body 20 in the cable insertion groove 22 of the main body 20 and the cable fixing port 30 is sealed and fixed by ultrasonic welding.

If the frequency of the ultrasonic wave is lower than 15 KHz, there may be a problem that the connection part between the main body 20 and the cable (C) does not dissolve or dissolve much time. , And when the frequency of the ultrasonic wave is higher than 20 KHz, the main body 20 and the cable (C) are severely melted and the main body 20 and the cable (C) are deformed rather than fusion bonding.

Example

The waterproof property of the solar photovoltaic junction box was improved by the method of the present invention, and the result was examined.

The components of the bypass diode 11, the metal heat sink 12 and the compression clip 13 are mounted inside the cover 10 in the component mounting step S1, C was inserted into the cable insertion port 22 of the cover 10 to connect the lead wire to the metal heat sink 12.

The cover 10 is inserted into the main body 20 with the component facing the inside of the main body 20 in the cover / main body coupling step (S3 step) Is inserted into the fixing hole insertion groove (21) of the main body (20).

Subsequently, ultrasonic wave is applied to the connecting portion of the main body 20 and the cable C by the ultrasonic welder in the cable fixing step (S5 step) to fix the cable C to the main body 20 by welding and the silicon injection step S6 , Silicone was injected into the silicon insertion port 14 of the cover 10 to seal the space inside the cover 10 and the main body 20.

Finally, in the silicon hardening step (S7), the junction box into which the silicon was implanted was allowed to stand in the air for 25 hours to cure the silicon.

In the solar photovoltaic junction box constructed as described above, the cable C is firmly fused and fixed to the main body 20 without the adhesive, and the time required for fixing the cable C to the main body 20 is greatly shortened So that the fixing of the main body 20 and the cable C is clean without being deformed and the cable C is not defective and the cable C is fixed to the main body 20 by a separate coupling means It is possible to reduce the expenses such as labor costs and prevent the parts inside the main body 20 from being damaged.

While the present invention has been described with reference to the preferred embodiments, it is to be understood that the invention is not limited thereto and that various changes and modifications may be made therein without departing from the scope of the invention.

10: cover 11: bypass diode
12: metal heat sink 13: crimp clip
14: silicon insertion port 20: main body
21: Fixture insertion slot 22: Cable insertion slot
30: Cable clamp C: Cable

Claims (4)

A component mounting step (S1 step) of mounting the components of the bypass diode 11, the metal heat sink 12 and the compression clip 13 inside the cover 10; A cable connecting step (S2) of inserting the cable (C) into the cable insertion hole of the cover (10) and connecting the cable (C) to the metal heat sink (12); (Step S3) of inserting the cover 10 into the main body 20 with the part facing the inside of the main body 20; A fixture coupling step (S4) of inserting the cable fixture (30) into the fixture insertion slot (21) of the main body (20); A cable fixing step (S5) of fixing the cable (C) to the main body (10) by applying ultrasonic waves to the connecting portion of the main body (20) and the cable (C) with an ultrasonic welder; A silicon injection step (S6) of injecting silicon into the silicon insertion port 14 of the cover to seal the space inside the cover 10 and the main body 20; A method for improving the water resistance of a solar photovoltaic junction box made of a solar cell comprising a silicon junction box in which silicon is injected for 24 to 26 hours to cure silicon (S7 step). The cover (10) according to claim 1, wherein the connection part of the diode (11), the metal heat sink (12) and the compression clip (13) and the metal heat sink (12) 10. A method for improving the waterproofness of a solar photovoltaic junction box according to claim 1, The cable according to claim 1, characterized in that the cable (C) connected to the main body (20) is sealed and fixed by ultrasonic welding in the cable insertion groove (22) of the main body (20) A method for improving the waterproofness of a commercial solar junction box. The method of claim 1, wherein the frequency of the ultrasonic waves is 15 to 20 KHz.

Images