JP2016214033A - Solar cell module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To achieve a solar cell module which can operate rapidly when connecting an output lead wire to a terminal board in a terminal box.SOLUTION: A solar cell module, in which output lead wires 3A, 3B and 3C pulled out from a solar cell panel are connected to module connecting cables 16a and 16b, which feed electricity output from the solar cell panel to the outside, in a terminal box 20, comprises floating prevention structures 2A, 2B and 2C which prevent floating while sandwiching the output lead wires 3A, 3B and 3C pulled into the terminal box 20, and has terminal boards 1A, 1B and 1C which are connected to the output lead wires 3A, 3B and 3C and the module connecting cables 16a and 16b, where the output lead wires 3A, 3B and 3C are fixed to the terminal boards 1A, 1B and 1C with the output lead wires sandwiched among the floating prevention structures 2A, 2B and 2C.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a solar cell module provided with output lead wires for electrical connection to a solar cell box.

  In a general solar cell module, in order to electrically connect a solar cell array in which a plurality of solar cells are arranged and a terminal box, the output lead wire of the solar cell panel and the terminal plate in the terminal box are soldered. Or, fixing by sandwiching using resin parts.

  In a solar cell module, generally, a plurality of strings in which solar cells are connected in series are sealed, and output lead wires from the strings are drawn into a terminal box. The terminal box includes a plurality of terminal plates to which an output lead wire drawn out from the string is connected to one end and a module connecting cable is connected to the other end, and a bypass diode bridged between the terminal plates. Yes. The output lead is formed of a conductive material, one end is connected to the string electrode, and the other end is connected to the terminal plate of the terminal box. The interior of the terminal box may be filled with a potting agent that is an insulating material in order to maintain insulation.

  The connection portion between the output lead wire and the terminal plate is where all the electric power generated by the solar cells flows, and if peeling occurs due to poor adhesion between the connection portion between the output lead wire and the terminal plate, the output lead wire An electrical resistance is generated at the connection between the terminal board and the terminal box, and the terminal box may be damaged by abnormal heat generation. Since various stresses such as internal stress may be applied for a long time at the connection portion between the output lead wire and the terminal plate, the electrical connection portion between the output lead wire and the terminal plate does not peel off. Need to be in close contact.

  In order to improve the reliability of the electrical connection between the output lead wire and the terminal plate, and to prevent the occurrence of abnormal heat generation due to peeling of the connection portion, the output lead wire pulled out from the string is placed above the hole in the terminal plate. Patent Document 1 discloses a method of electrically connecting by soldering after bending from the bottom to the bottom.

International Publication No. 2009/081508

  In the invention disclosed in Patent Document 1, when the through hole of the output lead wire is provided in the terminal plate, the area of the terminal plate may increase, and when the output lead wire is passed through the hole provided in the terminal plate. In some cases, work time may be required.

  This invention is made | formed in view of the above, Comprising: It aims at obtaining the solar cell module which can work quickly, when connecting an output lead wire to the terminal board in a terminal box.

  In order to solve the above-described problems and achieve the object, the present invention provides an output lead wire drawn from the solar cell panel and a cable for transmitting the electrical output of the solar cell panel to the outside in a terminal box. The solar cell module includes a lifting prevention structure that prevents the lifting of the output lead wire drawn into the terminal box, and includes a terminal plate to which the output lead wire and the cable are connected. The output lead wire is fixed to the output lead wire in a state of being sandwiched between the floating prevention structure portions of the terminal board.

  According to the present invention, when connecting an output lead wire to a terminal board in a terminal box, there is an effect that a solar cell module capable of performing work quickly can be obtained.

The perspective view by the side of the light-receiving surface of the solar cell module concerning Embodiment 1 of this invention The perspective view of the back surface side of the solar cell module concerning Embodiment 1 The front view in the state where the cover of the terminal box of the solar cell module concerning Embodiment 1 was removed. The schematic diagram of the terminal board of the terminal box of the solar cell module concerning Embodiment 1 The conceptual diagram which shows the state which soldered the output lead wire pulled out from the solar cell array to the terminal board of the terminal box of the solar cell module concerning Embodiment 1 The top view of the terminal board of the terminal box of the solar cell module concerning Embodiment 2 of this invention Schematic diagram showing a state in which the output lead wire drawn from the solar cell array is soldered to the terminal plate of the terminal box of the solar cell module according to the second embodiment.

  Below, the solar cell module concerning embodiment of this invention is demonstrated in detail based on drawing. Note that the present invention is not limited to the embodiments.

Embodiment 1 FIG.
FIG. 1 is a perspective view of the light-receiving surface side of the solar cell module according to Embodiment 1 of the present invention. 2 is a perspective view of the back surface side of the solar cell module according to Embodiment 1. FIG. In the solar cell module 100, a plurality of solar cells 12 connected in series by tabs 18 are disposed between a front cover member 17 formed of a light-transmitting material and a back cover member 14 formed of a weather-resistant material. A solar cell panel 15 sandwiched between and sealed with a resin injected between the front cover member 17 and the back cover member 14, and a rectangular frame-shaped support frame 13 that supports the solar cell panel 15. The solar cell module terminal box 20 is attached to the back cover member 14 and constitutes the output portion of the solar cell module 100. Aluminum can be used as the material of the support frame 13.

  The terminal box 20 is made of a resin material such as plastic and has a box shape that constitutes an outer shell. The terminal box 20 includes a rectangular parallelepiped box-shaped box body 20A and a plate-shaped lid body 20B that are open on one surface. The lid 20B closes the open surface of the box body 20A. And the output part of the solar cell module 100 is accommodated in the inside of the box main body 20A. Module output cables 16a and 16b extending to the outside are connected to the output portion of the solar cell module 100 for the purpose of taking out the output of the solar cell module 100 and for connecting to other solar cell modules.

  FIG. 3 is a front view of the solar cell module according to the first embodiment with a terminal box cover removed. FIG. 4 is a schematic diagram of the terminal plate of the terminal box of the solar cell module according to the first embodiment. FIG. 5 is a conceptual diagram showing a state in which the output lead wire drawn from the solar cell array is soldered to the terminal plate of the terminal box of the solar cell module according to the first embodiment. FIG. 5 schematically shows a cross section taken along line VV in FIG. The box body 20A has a rectangular parallelepiped box shape, has a bottom surface and side surfaces surrounding the four sides of the bottom surface, and houses the output unit 4 of the solar cell module 100 therein. A rectangular lead wire inlet 20a is opened along the side at the upper corner of the bottom surface of the box main body 20A in FIG. Output lead wires 3A, 3B, 3C extending from the inside of the solar cell panel 15 are inserted into the box body 20A through the lead wire inlet 20a. Specifically, the output lead wires 3A, 3B, 3C are rectangular copper wires whose surfaces are solder-plated. On the other hand, cable lead-out holes 20b and 20c for pulling out the module connecting cables 16a and 16b are formed on the side surface of the box body 20A opposite to the lead wire lead-in port 20a.

  The terminal plates 1A, 1B, and 1C are provided with floating prevention structure portions 2A, 2B, and 2C. The floating prevention structures 2A, 2B, and 2C are used to suppress the floating of the output lead wires 3A, 3B, and 3C drawn from the outside of the terminal plates 1A, 1B, and 1C. The terminal plates 1A, 1B, 1C and the output lead wires 3A, 3B, 3C are electrically connected by soldering the floating prevention structures 2A, 2B, 2C to the output lead wires 3A, 3B, 3C with solder 11. Is done.

  The output unit 4 includes three terminal plates 1A, 1B, and 1C that connect external electric wires, and two bypass diodes 8A and 8B for bypassing the non-power generation cell. Projections 7A, 7B, and 7C project from the bottom surface of the box body 20A. The three terminal plates 1A, 1B, and 1C are made of a highly heat conductive material obtained by plating a metal having high electrical conductivity or a metal having high electrical conductivity, and each of the terminal plates 1A, 1B, and 1C is provided. The protrusions 7A, 7B, and 7C are inserted into the drilled mounting holes, fixed to the protrusions 7A, 7B, and 7C, and supported with a gap between the bottom surface of the box body 20A. The terminal boards 1A, 1B, 1C are arranged in parallel to each other in the left-right direction on the paper surface of FIG. At the upper end of the terminal plate 1A, 1B, 1C in FIG. 3, a lead wire connecting portion 1a to which the output lead wires 3A, 3B, 3C inserted through the lead wire inlet 20a are soldered is provided. ing. Output lead wires extending from one end of the plurality of solar cells 12 connected in series are joined to the lead wire connecting portion 1a.

  On the other hand, among the three terminal boards 1A, 1B, and 1C, a cable connecting portion 1b is provided at the lower end of the two terminal boards 1A and 1C at the left and right ends in FIG. 3, and the module connecting cable 16a. 16b are bonded by pressure bonding. The cable connection portion 1b is not provided at the lower end of the terminal board 1B in FIG. The lower end of the terminal board 1B on the paper surface of FIG. 3 is a large-area portion 1f that has a larger area than the other terminal boards 1A and 1C because heat dissipation is achieved and the width and length are both increased. And three flow holes 1e are perforated in large area part 1f. In the first embodiment, the flow hole 1e provided in the terminal board 1A is hidden behind the bypass diode 8A and thus does not appear on the paper surface of FIG. The terminal plates 1A, 1B, and 1C can be formed by press working to form the outer shape and form the flow holes 1e at the same time.

  The output part 4 of the box body 20A is filled with a potting material which is a heat conductive insulating resin for the purpose of waterproofing. After the placement and wiring of the output unit 4 is completed and the potting material is attached to the solar cell module 100, the potting material flows in between the components in a molten state without any gap, and then hardens. At this time, the terminal plates 1A, 1B, and 1C are sealed at the upper and lower surfaces with a potting material. When the molten potting material is poured, the potting material flows through the flow hole 1e.

  The bypass diodes 8A and 8B include an element body in which a semiconductor element is sealed with an insulating resin material and leg electrodes extending from the element body. The element body has a rectangular flat shape and a heat sink is exposed on one main surface in order to improve heat dissipation. The bypass diodes 8A and 8B are mounted on the terminal plates 1A and 1B with one main surface of the element body being in surface contact with the terminal plates 1A and 1B.

  The bypass diodes 8A and 8B have a rectifying function based on a PN junction, and one of the two leg electrodes has an N pole and the other has a P pole. And it bridges so that it may straddle between terminal boards with two leg part electrodes. That is, the bypass diodes 8A and 8B have the element body supported by one of the two adjacent terminal plates, and one of the leg electrodes is connected to the terminal plate, and the other leg electrode is connected to the other one of the leg electrodes. It extends to the other terminal board side and bridges between both terminal boards. The bypass diode 8A bridges between the terminal plate 1A and the terminal plate 1B and bypasses when there is an unpowered cell to prevent current from flowing into the unpowered cell. The bypass diode 8B bridges between the terminal plate 1B and the terminal plate 1C to bypass current flow into the non-powered cells when there are unpowered cells.

  The element main body of the bypass diodes 8A and 8B is a heat source that generates heat. The module connecting cables 16a and 16b include metal wires and have a heat dissipation function. An element body of a bypass diode 8A is mounted on the terminal board 1A, and a module connection cable 16a is connected thereto. On the terminal board 1B, the element main body of the bypass diode 8B is mounted and the module connecting cable is not connected. A bypass diode is not mounted on the terminal board 1C, and a module connection cable 16b is connected thereto. That is, the terminal board 1B is in the most severe environment with respect to heat dissipation. In the first embodiment, on the side opposite to the lead wire connecting portion 1a of the terminal plate 1B, a large area portion 1f having a larger area than the other terminal plates 1A and 1C is provided to improve heat dissipation.

  In the terminal box 20 of the first embodiment, three terminal plates 1A, 1B having good thermal conductivity, which are provided in the box body 20A and to which output lead wires 3A, 3B, 3C extending from the solar cell module 100 are connected. 1C, a plurality of bypass diodes 8A, 8B for bypassing unpowered cells that are mounted on the terminal plates 1A, 1B and bridge between the terminal plates 1A, 1B, 1C, and a potting material filled in the box body 20A It has. Further, the terminal plates 1A, 1B, and 1C are supported by protrusions 7A, 7B, and 7C standing from the bottom surface of the box body 20A so as to form a gap with the bottom surface, and the upper and lower surfaces are sealed with a potting material. The The terminal plate 1B has a flow hole 1e. When the potting material is filled in the box body 20A, the molten potting material flows through the flow hole 1e. As a result, the inside of the box body 20A is appropriately cooled and the performance is improved.

  Furthermore, since the output lead wires 3A, 3B, and 3C are prevented from being separated from the terminal plates 1A, 1B, and 1C by the floating prevention structures 2A, 2B, and 2C, the output lead wires 3A, 3B, and 3C are connected to the terminal plate 1A. , 1B, 1C can improve the reliability of electrical connection.

Embodiment 2. FIG.
FIG. 6 is a plan view of the terminal plate of the terminal box of the solar cell module according to the second embodiment of the present invention. FIG. 7 is a conceptual diagram showing a state in which the output lead wires drawn from the solar cell array are soldered to the terminal plate of the terminal box of the solar cell module according to the second embodiment. FIG. 7 shows a cross section corresponding to the VV cross section in FIG. 3 of the solar cell module according to the second embodiment. In the solar cell module 100 according to the second embodiment, a hole 19 is formed in the floating prevention structure 2A of the terminal board 1A.

  Since the hole 19 is provided in the floating prevention structure portion 2A, the solder 11 can be supplied to the interface between the floating prevention structure portion 2A and the output lead wire 3A through the hole 19, and the wetting and spreading of the solder is promoted. Therefore, the reliability of electrical joining between the terminal board 1A and the output lead wire 3A can be further improved. As for the terminal plates 1B and 1C, similarly to the terminal plate 1A, the reliability of the electrical connection with the output lead wires 3B and 3C can be improved by providing holes in the floating prevention structure portions 2B and 2C. .

  Since the portions other than the holes 19 are the same as those in the first embodiment, a duplicate description is omitted.

  The configuration described in the above embodiment shows an example of the contents of the present invention, and can be combined with another known technique, and can be combined with other configurations without departing from the gist of the present invention. It is also possible to omit or change the part.

  1A, 1B, 1C Terminal board, 1a Lead wire connection part, 1b Cable connection part, 1e Distribution hole, 1f Large area part, 2A, 2B, 2C Lifting prevention structure part, 3A, 3B, 3C Output lead wire, 4 Output part 7A, 7B, 7C Protrusion, 8A, 8B Bypass diode, 11 Solder, 12 Solar cell, 13 Support frame, 14 Back cover member, 15 Solar panel, 16a, 16b Module connection cable, 17 Front cover member, 18 Tab , 19 holes, 20 terminal box, 20A box body, 20B lid, 20a lead wire inlet, 20b, 20c cable outlet hole, 100 solar cell module.

Claims (3)

An output lead wire drawn from the solar cell panel and a cable for transmitting the electrical output of the solar cell panel to the outside are solar cell modules connected in a terminal box,
Comprising a lifting prevention structure for preventing lifting across the output lead wire drawn into the terminal box, and having a terminal plate to which the output lead wire and the cable are connected;
The said output lead wire is being fixed to the said output lead wire in the state pinched | interposed into the said floating prevention structure part of the said terminal board, The solar cell module characterized by the above-mentioned.   The solar cell module according to claim 1, wherein the output lead wire is soldered to the floating prevention structure portion.   The solar cell module according to claim 2, wherein the floating prevention structure portion is formed with a hole through which molten solder flows during soldering.

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