JP2017002462A - Conduction plate for solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a conduction plate for a solar cell module capable of suppressing dissimilar metal contact corrosion caused when conduction metal fittings of dissimilar metal are mounted.SOLUTION: A metal plate body 1 plated with aluminum is provided on a surface of a stainless material. A frame Q is provided which supports adjacent solar cell modules in arrangement. A metal plate body 1 is mounted on a support surface Q1 of the frame Q. The metal plate body 1 is cut and raised to form a plurality of pointed projection parts 4A annularly. An outer peripheral-side surface of each pointed projection part 4A is coated with a coating material 4B of aluminum plating. The coating material 4B suppresses dissimilar metal contact corrosion caused when an electric connection is made.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a solar cell module conduction plate that can electrically connect solar cell modules to each other simply by laying the solar cell modules below a plurality of solar cell modules installed on a roof or the like.

  When connecting a plurality of solar cell modules placed on a roof or the like to each other, for example, a connection fitting between solar cell modules as described in Patent Document 1 is used. This connection metal fitting is a connection metal fitting that has sharp protrusions and engages with the frames of adjacent solar cell modules. In use, when the end frame of the solar cell module is fastened to the pedestal with bolts, sharp projections peel off the paint on both end frames and electrically connect them.

  On the other hand, Patent Document 2 describes a solar cell module mounting structure using a conductive washer in order to facilitate electrical connection of the solar cell module. In this attachment structure, a bolt for attaching the solar cell module to the gantry is inserted into the conductive washer, and when the bolt is attached to the gantry, the solar cell modules are electrically connected to each other by the conductive washer.

Japanese Patent No. 3475993 JP-A-9-250219

  When a solar cell module is placed on a roof or the like, an aluminum extruded material having light weight, corrosion resistance, and weather resistance is widely used as the material of the frame of the solar cell module. When a conductive metal fitting made of a material other than an aluminum material is used for a solar cell module made of this aluminum material, there is a risk that dissimilar metal contact corrosion called electrolytic corrosion or galvanic corrosion may occur.

  That is, as the material of the conventional conducting metal fittings, stainless steel and color stainless steel having conductivity, strength, and corrosion resistance are widely used. However, for the conduction of the solar cell module, when a stainless steel metal fitting is interposed between the aluminum frames, metal materials having different potentials come into contact with each other. That is, due to the potential difference of the metal, the aluminum material becomes a base metal anode (anode), the stainless steel material becomes a noble metal cathode (cathode), current flows, and the anode (anode) ionizes the aluminum material. It is encouraged and corroded. When such corrosion occurs, not only the conductivity is deteriorated and the conduction effect is lowered, but also the frame strength of the solar cell module is adversely affected.

  Moreover, like the conductive metal fittings described in Patent Document 1 and Patent Document 2, each of the conventional conductive metal parts has a structure in which a bolt is inserted into a hole opened in the conductive metal part. Therefore, in order to attach the conductive metal fitting between the gantry and the solar cell module, it is necessary to attach the conductive metal metal to the bolt before connecting the solar cell module with the bolt. Therefore, when attaching a conductive metal fitting to a solar cell module already mounted on a roof or the like, it is necessary to remove the member from the connecting bolt, which is tedious.

  Furthermore, since the conducting metal fittings described in Patent Literature 1 and Patent Literature 2 are both mounted between the solar cell module and the gantry, the conducting metal fitting after mounting is necessarily hidden by the solar cell module. Therefore, after completion of the construction, it is in a state where it is impossible to visually confirm whether or not the conductive metal fitting is properly attached. To confirm the presence or absence of the conductive metal piece, measure the conductivity with a tester or the like. Such an extremely troublesome work was necessary.

  Accordingly, the present invention has been created to solve the above-mentioned problems, and can prevent contact with different metals from occurring in the frame of the solar cell module due to the mounting of the conductive metal fittings. It is an object of the present invention to provide a conductive plate for a solar cell module that can easily confirm the presence or absence of a conductive metal fitting even after the solar cell module is mounted.

  In order to achieve the above object, the first means in the present invention is that a plurality of protrusions 4 protrude from the upper surface of the metal plate 1 and the lower surfaces of the aluminum frames P1 of the solar cell module P adjacent to the protrusions 4. In the solar cell module conduction plate that bites into the solar cell module P and electrically connects the solar cell modules P, the metal plate 1 has a structure in which a surface of a stainless steel plate is subjected to aluminum plating, and the protrusion 4 is formed of the metal plate. A plurality of stainless steel sharpened projections 4A formed by cutting and raising the body 1 project so as to form an annular shape, and an aluminum plating covering material 4B is arranged on the surface of each of the sharpened projected portions 4A located on the outer circumference of the annular shape In other words, the covering material 4B is configured to suppress the contact corrosion of dissimilar metals at the time of electrical connection.

  In the second means, the metal plate 1 includes a conductive piece 2 placed on the support surface Q1 of the gantry, and a contact piece bent from the conductive piece 2 to the side surface Q3 side of the gantry Q. 3, the side face of the connecting bolt R connecting the frame P1 placed on the support surface Q1 of the gantry Q and the gantry Q is clearly slid, and the conductive piece 2 is placed on the support surface Q1 of the gantry Q. It is configured to be placed.

  In the third means, the conductive piece 2 is adjacent to the abutting piece 3 and is placed along the longitudinal direction of the support surface Q1, and from the base end portion 2A to the support surface Q1. An insertion portion 2B extended in the direction of the connection bolt R, and a notch-shaped slide recess 2C provided in the insertion portion 2B so that the insertion portion 2B slides in the side surface direction of the connection bolt R; It is equipped with.

  The fourth means is arranged such that when the conductive piece 2 is placed on the support surface Q1 of the gantry Q, the contact piece 3 is exposed on the side surface Q3 side of the gantry Q. The piece 3 is provided with a display portion 3A for displaying the grounding state of the metal plate 1.

  As in claim 1, the metal plate 1 has a structure in which the surface of a stainless steel plate is subjected to aluminum plating, and the protrusion 4 has a plurality of sharpened protrusions 4 A made of stainless steel formed by cutting and raising the metal plate 1. Projecting so as to form an annular shape, and the aluminum plating covering material 4B is disposed on the surface of each sharp projecting portion 4A located on the outer periphery of the annular shape, so that the aluminum of the adjacent solar cell module P It is possible to suppress dissimilar metal contact corrosion when the manufactured frames P1 are electrically connected to each other.

  That is, the tip of the protrusion 4 is exposed by a sharpened protrusion 4A made of stainless steel, and the outside of the stainless steel is covered with a coating material 4B made of aluminum. Therefore, when the stainless steel sharp protrusion 4A bites into the aluminum frame P1, the aluminum material of the frame P1 and the aluminum covering material 4B overlap the periphery of the stainless sharp protrusion 4A. Is in a barrier state wrapped by the covering material 4B. As a result, it is possible to remarkably enhance the effect of suppressing contact corrosion of different metals.

  In addition, since the protrusion 4 protrudes so that the plurality of sharp protrusions 4A form an annular shape, when one protrusion 4 bites into the frame P1, the plurality of sharp protrusions 4A come into surface contact, and the conduction Since the area increases, an excellent conduction effect can be obtained.

  As in claim 2, the metal plate 1 includes a conductive piece 2 placed on the support surface Q1 of the gantry and a contact piece 3 bent from the conductive piece 2 toward the side surface Q3 of the gantry. The side face of the connecting bolt R that connects the frame P1 placed on the support surface Q1 of the gantry Q and the gantry Q slides clearly to place the conductive piece 2 on the support surface Q1 of the gantry Q. Thus, the mounting work of the metal plate 1 can be facilitated. Moreover, since it is not necessary to pass the connecting bolt R as in the case of the conventional conducting metal fittings, even if the metal plate 1 is attached after the solar cell module P is installed, the connecting bolt R is loosened to the frame. It can be easily mounted just by opening a gap between P1 and the gantry Q.

  As in claim 3, the conductive piece 2 includes a base end portion 2A placed along the longitudinal direction of the support surface Q1, and an insertion portion 2B extended from the base end portion 2A in the connecting bolt R direction. And a notch-shaped slide concave portion 2C provided in the insertion portion 2B, it is possible to obtain a conduction effect that effectively utilizes the area of the support surface Q1.

  As in claim 4, when the conductive piece 2 is placed on the support surface Q1 of the gantry Q, the contact piece 3 is arranged so as to be exposed on the side surface Q3 side of the gantry Q. Since the display portion 3A for displaying the grounding state of the metal plate 1 is provided in the connecting piece 3, the connecting piece 3 is exposed between the adjacent solar cell modules P even if the conductive piece 2 is hidden behind the solar cell module P. The presence or absence of the metal plate 1 can be confirmed at a glance.

It is a disassembled perspective view which shows the mounting state of this invention. It is a perspective view which shows the mounting state of this invention. It is a top view which shows one Example of this invention. It is a side view which shows one Example of this invention. It is an expansion perspective view which shows one Example of the protrusion of this invention. The other mounting | wearing state of this invention is shown, (A) is a top view, (B) is a sectional side view. It is a principal part perspective view which shows the cross-section of the metal plate body of this invention.

  According to the present invention, the dissimilar metal contact corrosion generated in the frame of the solar cell module due to the mounting of the conductive metal fitting can be suppressed, the mounting operation is extremely simple, and the retrofitting can be easily performed. The initial objectives such as being able to easily confirm the presence or absence of the conductive metal fittings even after installation were achieved.

  Examples of the present invention will be described below. The conducting metal fitting of the present invention is a metal fitting that electrically connects the solar cell modules P to each other through the frames P1 of the solar cell modules P formed of an extruded aluminum material (see FIG. 1). That is, the solar cell modules P are electrically connected to each other by laying them on the support surface Q1 of the gantry Q that supports the lower surfaces of the frames P1 of the adjacent solar cell modules P side by side (see FIG. 2).

  The conducting metal fitting of the present invention is composed of a metal plate 1 in which the surface of a stainless steel is subjected to aluminum plating (see FIG. 7). A plurality of protrusions 4 that cut and raise the metal plate 1 and bite into the lower surface of the frame P1 of each solar cell module P are provided in an annular shape on the upper surface of the metal plate 1 (see FIG. 3).

  The protrusions 4 bite into the lower surface of the frame P1 of the solar cell module P to electrically connect the solar cell modules P to each other (see FIG. 4). At this time, as a characteristic of the aluminum material that constitutes the frame P1 of the solar cell module P, when the aluminum material comes into contact with the stainless steel material, different metal contact corrosion occurs, and this different metal contact corrosion hinders conductivity.

  Therefore, the protrusion 4 protrudes such that a plurality of sharpened protrusions 4A made of stainless steel formed by cutting and raising the metal plate 1 form an annular shape (see FIG. 5). The outer peripheral surface of each sharp protrusion 4A is kept covered with an aluminum plating coating material 4B, and the coating material 4B is arranged on an annular outer periphery. In the illustrated projection 4, the sharp protrusions 4 </ b> A are arranged in an annular shape, but in addition to this, a rectangular ring formed so as to oppose the four sharp protrusions 4 </ b> A or three sharp protrusions 4 </ b> A are projected. It is also possible to project it into a triangular ring shape. However, the outer side of each sharp protrusion 4A is configured so that the covering material 4B is always disposed.

  As described above, when the metal plate 1 with the aluminum plating applied to the surface of the stainless material is cut and raised to form the protrusion 4, the stainless material at the tip of the protrusion 4 bites into the frame P1 of the solar cell module P and becomes electrically conductive. (See FIG. 4). At this time, the stainless steel material and the aluminum material of the frame P1 are in contact with different metals, but the periphery of the protrusion 4 that has bitten into the frame P1 is surrounded by the aluminum material of the frame P1 and the aluminum material of the covering material 4B. become. Therefore, the covering material 4B around the protrusion 4 serves as a barrier and suppresses erosion due to electrolytic corrosion.

  Furthermore, the annular protrusion 4 in the illustrated example can be easily formed by penetrating a sharp protrusion in the upper surface direction from the lower surface side of the metal plate 1 (see FIG. 4). As described above, the protrusion 4 that uses the coating material 4B as a barrier for electrolytic corrosion can be formed relatively easily, and thus can be formed at any position of the metal plate 1. However, the means for forming the protrusions 4 is not limited to this example. Furthermore, by configuring the protrusions 4 so as to protrude from both surfaces of the metal plate 1, it is possible to electrically connect the frame P1 and the gantry Q in addition to the electrical connection between the frames P1.

Table 1 shows the results of measuring the connection resistance values of a rectangular tube-shaped test piece made of an aluminum extruded material and conducting them with a metal plate of the test piece. In the corrosion and combined corrosion cycle test (CCT test) between the metal plate 1 and another metal plate, comparison results of connection resistance values before and after the test are shown. The test specimens are “stainless steel plated with aluminum (metal plate 1)”, “color stainless steel”, “SUS304 (austenitic stainless steel)” and “SUS430 (ferritic stainless steel)” in order from the top of the table. Three specimens were used as test specimens.
* The connection resistance value was measured between test pieces.
* The connection resistance was measured before the test and after the CCT test was completed (100 cycles).
* The tightening torque of the bolt connecting the test body and the DUT was 14.7 N · m.

As a result of the test, before and after the test, the “aluminum-plated stainless steel” of the present invention had the lowest resistance value of the test object, and stable electrical conduction was obtained. “Color stainless steel” did not have a large difference in resistance before and after the test, but the resistance value was larger than that of “aluminum-plated stainless steel” and it was confirmed that the conductive state was unstable depending on the specimen.
It can be seen that “SUS304” and “SUS430” have a large increase in resistance after the test compared to “stainless steel plated with aluminum” and “colored stainless steel”. In particular, it is considered that a specimen having an extremely increased resistance value is obtained by corroding an aluminum extruded material.
Moreover, the trace which the processus | protrusion 4 contacted in each to-be-tested object remained. The corrosion trace of the protrusion 4 by the “aluminum-plated stainless steel” according to the present invention is limited to the position where the protrusion 4 is cut in, and is limited to the annular inner side of the protrusion 4. On the other hand, it was confirmed that the corrosion marks on the protrusions 4 in the remaining metal plate test spread to the outside of the ring, although there were individual differences.
From the above results, it can be said that “aluminum-plated stainless steel” is the most suitable material for the conducting metal fitting among the four types of materials, and is the material most effective in suppressing the contact corrosion of different metals.

  The metal plate 1 has a shape including a conductive piece 2 placed on the support surface Q1 of the gantry and a contact piece 3 bent from the conductive piece 2 to the side surface Q2 of the gantry. Yes. Then, the side face of the connecting bolt R that connects the frame P1 placed on the support surface Q1 of the gantry Q and the gantry Q slides clearly to place the conductive piece 2 on the support surface Q1 of the gantry Q. Is. By configuring the metal plate 1 in this manner, it is only necessary to place the metal plate 1 between the support surface Q1 of the gantry Q and the frame P1 in advance, so that it can be easily mounted without using a tool. Further, the existing frame P1 can be mounted so as to be inserted from the gap only by loosening the connecting bolt R.

  The conductive piece 2 in the illustrated example includes a base end portion 2A, an insertion portion 2B, and a slide concave portion 2C. The base end 2A is a part that is adjacent to the contact piece 3 and is placed along the longitudinal direction of the support surface Q1. Moreover, the insertion part 2B is a site | part formed so that it might protrude toward the connection volt | bolt R direction of this support surface Q1 from this base end part 2A. Furthermore, the slide recess 2 </ b> C is a notch-shaped recess provided so that the insertion portion 2 </ b> B slides in the side surface direction of the connecting bolt R. By forming the conductive piece 2 in this manner, for example, the base Q that directly fixes the frame P1 with the connecting bolt R that passes through the insertion hole Q2 that penetrates the support surface Q1 of the base Q, like the base Q of the field stand. The metal plate 1 can be easily attached (see FIG. 1).

  Moreover, it can also be used according to the connection bolt R of the flame | frame P1 fixed via arbitrary fixing brackets S other than the stand Q directly fixed (refer FIG. 6). The illustrated fixing bracket S uses a fixing bracket S installed on the upper surfaces of adjacent frames P1 (see FIG. 2B). And the conduction | electrical_connection piece 2 is inserted between the lower surface of the flame | frame P1 crimped | bonded on the support surface Q1 of the mount frame Q via this fixing bracket S, and the support surface Q1 (refer the same figure (I)). In the illustrated conduction piece 2, a pair of insertion portions 2B are provided on both sides of the slide recess 2C. However, the number of the slide recess 2C and the insertion portion 2B can be arbitrarily increased. The effect of preventing the increase and the lateral shift can be achieved. Thus, the shape of the conduction | electrical_connection piece 2 can be changed arbitrarily.

  On the other hand, the contact piece 3 is provided so as to be exposed to the side surface Q3 side of the gantry Q when the conductive piece 2 is placed on the support surface Q1 of the gantry Q (see FIG. 4). The contact piece 3 is provided with a display portion 3A for displaying the grounding state of the metal plate 1 (see FIG. 2). In the illustrated contact piece 3, a circular display portion 3 </ b> A such as an “E mark” is formed as a visual mark. The display unit 3A is not limited to this example, and can be freely selected from a configuration that serves as a mark, such as coloring the connecting piece 3 to form the display unit 3A.

  In addition, each structure of the metal plate 1 of this invention is not limited to the example of illustration, The shape of the conduction | electrical_connection piece 2, the connection piece 3, protrusion 4, etc. can be freely changed in design in the range which does not change the summary of this invention. can do. Moreover, the installation position of the metal plate 1 is not limited to the illustrated example, and the shape and structure of the gantry Q are not limited as long as the frame P1 is placed thereon.

P Solar cell module P1 Frame Q Mounting base Q1 Support surface Q2 Insertion hole Q3 Side surface R Connection bolt R1 Nut S Fixture 1 Metal plate body 2 Conductive piece 2A Base end portion 2B Insertion portion 2C Slide recess portion 3 Contact piece 3A Display portion 4 Projection Sharp projection Covering material

In order to achieve the above object, the first means in the present invention is that a plurality of protrusions 4 protrude from the upper surface of the metal plate 1 and the lower surfaces of the aluminum frames P1 of the solar cell module P adjacent to the protrusions 4. In the solar cell module conduction plate that bites into the solar cell module P and electrically connects the solar cell modules P, the metal plate 1 is plated with aluminium on the surface of a stainless steel plate and supports the pedestal that supports the solar cell module P The frame P1 mounted on the support surface Q1 of the gantry Q, including the conductive piece 2 placed on the surface Q1 and the contact piece 3 bent from the conductive piece 2 toward the side surface Q3 of the gantry Q. The side surface of the connecting bolt R that connects the gantry Q and the gantry Q slides from the side and the conductive piece 2 is placed on the support surface Q1 of the gantry Q. The protrusion 4 cuts and raises the metal plate 1 Shape The plurality of stainless steel sharp projections 4A project so as to form an annular shape, and an aluminum plating coating material 4B is arranged on the surface of each sharp projection 4A located on the outer periphery of the annular shape, The covering material 4B is configured to suppress contact corrosion of dissimilar metals during electrical connection.

In the second means, the conductive piece 2 is adjacent to the abutting piece 3 and is placed along the longitudinal direction of the support surface Q1, and from the base end portion 2A to the support surface Q1. An insertion portion 2B extended in the direction of the connection bolt R, and a notch-shaped slide recess 2C provided in the insertion portion 2B so that the insertion portion 2B slides in the side surface direction of the connection bolt R; It is equipped with.

The third means is arranged such that when the conductive piece 2 is placed on the support surface Q1 of the gantry Q, the contact piece 3 is exposed on the side surface Q3 side of the gantry Q. The piece 3 is provided with a display portion 3A for displaying the grounding state of the metal plate 1.

The metal plate 1 includes a conductive piece 2 placed on the support surface Q1 of the gantry that supports the solar cell module P, and a contact piece that is bent from the conductive piece 2 toward the side surface Q3 of the gantry. 3 and the side face of the connecting bolt R connecting the frame P1 placed on the support surface Q1 of the gantry Q and the gantry Q slides clearly to place the conductive piece 2 on the support surface Q1 of the gantry Q. By comprising in this, the mounting | wearing operation | work of the metal plate 1 can be made easy. Moreover, since it is not necessary to pass the connecting bolt R as in the case of the conventional conducting metal fittings, even if the metal plate 1 is attached after the solar cell module P is installed, the connecting bolt R is loosened to the frame. It can be easily mounted just by opening a gap between P1 and the gantry Q.

As in claim 2 , the conductive piece 2 includes a base end portion 2A placed along the longitudinal direction of the support surface Q1, and an insertion portion 2B extended from the base end portion 2A toward the connecting bolt R. And a notch-shaped slide concave portion 2C provided in the insertion portion 2B, it is possible to obtain a conduction effect that effectively utilizes the area of the support surface Q1.

As in claim 3 , when the conductive piece 2 is placed on the support surface Q <b> 1 of the gantry Q, the contact piece 3 is arranged so as to be exposed on the side surface Q <b> 3 side of the gantry Q, Since the display portion 3A for displaying the grounding state of the metal plate 1 is provided in the connecting piece 3, the connecting piece 3 is exposed between the adjacent solar cell modules P even if the conductive piece 2 is hidden behind the solar cell module P. The presence or absence of the metal plate 1 can be confirmed at a glance.

Claims (4)

In the solar cell module conducting plate, a plurality of protrusions project from the upper surface of the metal plate body, and the protrusions bite into the lower surface of each aluminum frame of the adjacent solar cell module to electrically connect the solar cell modules to each other.
The metal plate has a structure in which an aluminum plating is applied to the surface of a stainless steel plate,
The protrusion protrudes so that a plurality of sharpened protrusions of stainless steel formed by cutting and raising the metal plate form a ring, and the surface of each sharpened protrusion located on the outer periphery of the ring is coated with aluminum plating Configure the material to be placed,
A conductive plate for a solar cell module, wherein the covering material is configured to suppress contact corrosion of dissimilar metals during electrical connection.   The metal plate includes a conductive piece placed on the support surface of the gantry and a contact piece bent from the conductive piece to the side surface of the gantry, and placed on the support surface of the gantry The conductive plate for a solar cell module according to claim 1, wherein a side surface of a connecting bolt that connects the frame and the frame is slid from the side and a conductive piece is placed on a support surface of the frame.   The conductive piece is adjacent to the abutting piece and is placed along a longitudinal direction of the support surface, and a plug extending from the base end portion toward the connecting bolt of the support surface. The conducting plate for a solar cell module according to claim 2, further comprising: a portion, and a notch-shaped slide recess provided in the insertion portion so that the insertion portion slides in a side surface direction of the connection bolt.   When the conductive piece is placed on the support surface of the gantry, the contact piece is arranged so as to be exposed on the side surface of the gantry, and the grounding state of the metal plate is displayed on the contact piece. The conduction | electrical_connection plate for solar cell modules of Claim 2 which provided the display part.

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