JP4950260B2 - Terminal box for solar cell module - Google Patents

Description

  The present invention relates to a terminal box for a solar cell module.

  In recent years, due to the growing interest in environmental problems, an environmentally friendly power generation system, for example, a solar power generation system that generates power using a solar cell module has been attracting attention. As this solar power generation system, a system is known in which a plurality of solar cell modules are laid in a matrix on a building roof or the like to perform solar power generation. In such a solar power generation system, each solar cell module is provided with a terminal box in order to electrically connect the solar cell modules laid adjacent to each other and take out the electric power generated by each solar cell module. It has been.

  In this terminal box for solar cell module, in order to prevent the reverse current from flowing to the solar cell module when a part of the solar cell of the solar cell module is shaded, etc. A bypass diode is provided. A bypass diode is arrange | positioned between the terminal boards in a terminal box, and is connected in parallel with a solar cell module. As such a bypass diode, a terminal box for a solar cell module using a package type diode is known (for example, see Patent Document 1).

JP 2004-289181 A

  By the way, conventionally, it was difficult to connect the terminal plate and the output end on the solar cell module side. Specifically, a thin metal foil (for example, a copper foil) is usually provided at the output end of the solar cell module side. To connect this metal foil to the terminal board by soldering, It was necessary to move and connect the soldering iron with the other hand while fixing the metal foil at a predetermined position of the terminal board using tweezers with one hand. As described above, the connection work between the terminal plate and the output end on the solar cell module side is difficult and requires skill.

  The present invention has been made in view of the above-described problems of the prior art, and is a solar cell module terminal box capable of improving the workability of the connection work between the terminal plate and the output end on the solar cell module side. The purpose is to provide.

  A terminal box for a solar cell module according to the present invention is provided with a plurality of terminal plates in a box body, and a solar cell module in which a bypass diode is disposed between two terminal plates adjacent to each other among the plurality of terminal plates. In the terminal box for use, the box body includes a fixing protrusion at the bottom, the terminal plate has an upper plate-like body placed on the lower plate-like body, and the upper and lower two plate-like bodies are: The fixing protrusion is fixed to the box body, and a solder layer sandwiched between the plate-like bodies is formed at one end of the plate-like body, and the plate-like body includes the solder layer. The output end on the solar cell module side is sandwiched between and connected to the other plate-like body.

  According to the terminal box for a solar cell module having such a configuration, the alignment of the output end on the solar cell module side to the connection position of the terminal plate is performed between the two plate-like bodies on the output end on the solar cell module side. It can be done by plugging in. And it can fix to a terminal board in the state which inserted the output end by the side of a solar cell module, and it becomes possible to improve the workability | operativity of the connection operation of a terminal plate and the output end by the side of a solar cell module.

  Since this invention is the above structures, alignment of the output end by the side of a solar cell module to the connection position of a terminal board inserts the output end by the side of a solar cell module between two plate-shaped bodies. Can be done in this way. And it can fix to a terminal board in the state which inserted the output end by the side of a solar cell module, and it becomes possible to improve the workability | operativity of the connection operation of a terminal plate and the output end by the side of a solar cell module.

It is a top view which shows one Embodiment of the terminal box for solar cell modules to which this invention is applied. It is a figure which shows the terminal box seen from the introduction direction of the connection cable. It is FF sectional drawing in FIG. It is a principal part side view which shows the terminal board in FIG. It is a top view which shows the bottom part of the box main body of a terminal box. It is a perspective view which shows the heat sink arrange | positioned in a box main body.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings for understanding of the present invention. In addition, the following embodiment is an example which actualized this invention, Comprising: The thing of the character which limits the technical scope of this invention is not.

  In a terminal box for a solar cell module to which the present invention is applied (hereinafter simply referred to as “terminal box”), the number of terminal plates provided in one terminal box is not particularly limited as long as it is plural. Below, the case where four terminal boards are provided is demonstrated.

  FIG. 1 is a plan view showing an embodiment of a terminal box for a solar cell module to which the present invention is applied.

  FIG. 2 is a diagram showing the terminal box as viewed from the direction of introduction of the connection cable.

  3 is a cross-sectional view taken along line FF in FIG.

  FIG. 4 is a side view of an essential part showing the terminal board in FIG.

  FIG. 5 is a plan view showing the bottom of the box body of the terminal box.

  FIG. 6 is a perspective view showing a heat radiating plate arranged in the box body.

  For convenience, the direction is determined as follows. In the terminal box 10, the direction in which the two connection cables 22, 22 are arranged is the left-right direction, and the direction in which the connection cables 22, 22 are introduced into the box body 11 is the front-rear direction.

  The terminal box 10 shown in FIGS. 1 to 6 is mounted on the back side of a solar cell module (not shown) provided on the surface with a plurality of solar cells (not shown) that are electrically connected to each other. It is. By using such a terminal box 10, a solar power generation system that performs solar power generation using a plurality of solar cell modules laid in a matrix, for example, on the roof of a building, etc., is provided adjacent to the solar power generation system. The battery modules are electrically connected to each other so that the electric power generated by each solar battery module can be taken out.

  The box body 11 of the terminal box 10 has characteristics such as weather resistance, electrical insulation, impact resistance, heat resistance, and flame resistance such as modified PPO (polyphenylene oxide) and ABS (acrylonitrile-butadiene-styrene). It is molded into a box shape using a synthetic resin or the like. The box body 11 has an opening on the upper surface side, and a plurality (four in this example) of connection holes 12, 12,. Further, two recesses 13 and 13 for introducing a cable are formed on the side wall. A fixing base 14 to which the terminal plate 60 is fixed, a fixing protrusion 15 for fixing the terminal plate 60, a bypass diode 20 and a fixing protrusion for fixing a heat radiating plate to be described later are provided on the bottom of the box body 11. 16 is formed (FIG. 5). And it has a structure in which a plate-like lid (not shown) is attached to the opening on the upper surface side and can be closed. The space inside the box body 11 is filled with an insulating resin (for example, silicone resin), and an electrical connection portion inside the box body 11 is resin-sealed.

  In the box body 11, four terminal plates 60, 60,... Are provided. These four terminal plates 60, 60,... Are arranged side by side at a predetermined interval. One end (front end) of each terminal board 60 is arranged so as to face the connection hole 12 of the box body 11. An output end (not shown) on the solar cell module side is connected to one end of each terminal board 60 by soldering. Further, a part (rear part) of the terminal plate 60 is placed on a protruding portion (not shown) of the fixing member 24 for fixing the cable so as not to come into contact with a heat sink described later.

  The terminal board 60 includes a first terminal board 61 and a second terminal board 62 provided on the first terminal board 61. That is, the terminal plate 60 is configured to include first and second terminal plates 61 and 62 that are two upper and lower plate-like bodies, and the output end on the solar cell module side is the first and second upper and lower two sheets. The two terminal boards 61 and 62 are connected in a state of being sandwiched between them. Note that a solder layer 63 is formed in advance at the tip (front end) of the base 61 a of the first terminal plate 61 of each terminal plate 60. The solder layer 63 is sandwiched between the tip portions of the first and second terminal plates 61 and 62.

  Among the four first terminal plates 61, 61,..., The two first terminal plates 61, 61 arranged at the left and right ends are a base 61a connected to the output end of the solar cell module, and the base. It consists of a diode connecting part 61b for connecting a diode extending in either one of the left and right directions from 61a and a cable connecting part 61c for connecting a cable extending rearward from the base part 61a. A fixing hole 61d for fixing is formed in the base 61a. On the other hand, of the four terminal boards 18, 18,..., The two first terminal boards 61, 61 arranged at positions other than the left and right ends are connected to the base 61a and two diode connections extending in the left and right directions. Diode connection portions 61b and 61b. Similarly, a fixing hole 61d for fixing is formed in the base 61a.

  Each first terminal board 61 is arranged on the fixed base 14 of the box body 11. Each of the second terminal plates 62 is a rectangular metal plate, and is disposed at a position substantially coincident with the base portion 61a of the first terminal plate 61 in plan view. A fixing hole 62a for fixing is formed in the second terminal plate 62. Each terminal plate 60 is fixed to the box main body 11 by a fixing projection 15 of the box main body 11 inserted into the mounting holes 61 d and 62 a of the first and second terminal plates 61 and 62.

  When the terminal plate 60 is disposed in the box body 11, first, the first terminal is inserted into the groove 14 a of the fixing base 14 while the fixing protrusion 15 of the box body 11 is inserted into the mounting hole 61 d of the first terminal plate 61. The base 61a of the plate 61 is fitted. Next, the second terminal plate 62 is placed on the first terminal plate 61 while the fixing protrusion 15 is inserted into the mounting hole 62 a of the second terminal plate 62. Then, the first and second terminal plates 61 and 62 are fixed to the box body 11 by heat-deforming the top portions of the fixing protrusions 15 protruding from the mounting holes 62 a of the second terminal plate 62.

  A bypass diode 20 is disposed between two adjacent terminal plates 60 and 60 inside the box body 11. In this example, the number of bypass diodes 20 used in one terminal box 10 is three. The bypass diode 20 is connected in parallel with the solar cell module between the two terminal plates 60, 60, thereby preventing a reverse current from flowing to the solar cell module. In this example, a package type diode formed by molding with synthetic resin or the like is used as the bypass diode 20.

  When the bypass diode 20 is disposed in the box body 11, the lead wire portion of the bypass diode 20 is connected to the diode connection portion 61 b of the terminal board 60 by soldering. At this time, the fixing protrusion 16 of the box main body 11 is inserted into the insertion hole 20a formed at the tip portion of the bypass diode 20, and the top of the fixing protrusion 16 is further heat-deformed to deform the bypass diode 20 into the box main body. 11 is fixed. The bypass diode 20 is fixed together with the heat sink to the box body 11 as described later.

  The box body 11 includes a plurality of heat radiating portions. In this example, heat radiation portions 30, 40, 50 for each bypass diode 20 are provided. The heat dissipating parts 30, 40, 50 are provided for heat dissipation for releasing the heat of the bypass diode 20, thereby avoiding a temperature rise due to heat generation of the bypass diode 20. The heat radiating portions 30, 40, 50 are formed of a heat radiating plate as a heat radiating member, for example, a metal plate having excellent thermal conductivity such as aluminum, copper, stainless steel or the like. Details of the heat dissipating units 30, 40, and 50 will be described later.

  Connection cables 22 and 22 are connected to the terminal plates 60 and 60 at both the left and right ends inside the box body 11. The connection cable 22 is introduced into the box body 11 from the cable introduction recess 13 formed on the side wall of the box body 11, and is connected to the cable connection portion 61 c of the terminal board 60. The connection cables 22 and 22 are covered with a fixing member 24 for fixing the cable from above (FIG. 2). The fixing member 24 is formed of the same material as that of the box body 11, and the connection cables 22 and 22 are fixed to the box body 11 by fixing the fixing member 24 to the box body 11 by ultrasonic welding. . On the other hand, each connection cable 22 is connected to an external connection connector 23 outside the box body 11, and the connection cable for the terminal box 10 provided in another solar cell module via the external connection connector 23. 22 etc. can be connected to each other.

  Next, the heat radiating portions 30, 40, 50 will be described in detail with reference to FIGS.

  As described above, the heat radiating portion is provided for each bypass diode 20 provided in the terminal box 10. In this example, a heat dissipating part 30 for the left bypass diode 20, a heat dissipating part 40 for the center bypass diode 20, and a heat dissipating part 50 for the right bypass diode 20 are provided. Each of the left, center and right radiating portions 30, 40, 50 includes a plurality of heat radiating plates arranged one above the other. The number of heat dissipation plates provided in each of the heat dissipation units 30, 40, 50 is not particularly limited, but in this example, three upper, middle, and lower heat dissipation plates are provided.

  Here, the heat radiating part 30 for the left bypass diode 20 will be described. The heat dissipating part 30 is provided with an upper heat dissipating plate 31, a central heat dissipating plate 32 and a lower heat dissipating plate 33 which are arranged one above the other. The upper, middle, and lower three heat sinks 31, 32, and 33 are sequentially placed in the box body 11, and the bypass diode 20 is placed on the upper heat sink 31.

  The upper heat radiating plate 31 and the lower heat radiating plate 33 have substantially the same L shape in plan view, and are arranged at positions that coincide with each other in plan view. The upper heat radiating plate 31 includes a front and rear portion 31a extending in the front and rear direction, and a protruding portion 31b protruding leftward from the front end portion of the front and rear portion 31a (the same applies to the lower heat radiating plate 33). And the insertion hole 31c in which the protrusion 16 for fixing of the box main body 11 mentioned above is inserted is formed in the front-rear part 31a.

  On the other hand, the central heat radiating plate 32 is substantially L-shaped in plan view, and includes a front and rear portion 32a extending in the front-rear direction, and a protruding portion 32b protruding rightward from the rear end portion of the front and rear portion 32a. An insertion hole 32c into which the fixing protrusion 16 of the box body 11 is inserted is formed in the front and rear portion 32a. The central heat radiating plate 32 is arranged such that a part of the front and rear portion 32a overlaps a part of the front and rear portions 31a and 33a of the upper and lower heat radiating plates 31 and 33 with each other. Further, the fixing protrusion 16 of the box main body 11 is inserted into the insertion holes 31c, 32c, 33c of the heat radiating plates 31, 32, 33, whereby the heat radiating plates 31, 32, 33 are connected to the box main body 11. It is fixed to. The above-described fixing member 24 for fixing the cable is placed on the central heat radiating plate 32.

  The bypass diode 20 is placed on the front and rear portions 31 a of the upper radiator plate 31 such that the fixing protrusion 16 is inserted into the insertion hole 20 a at the tip of the bypass diode 20. The bypass diode 20 and the three heat radiation plates 31, 32, and 33 are fixed to the box body 11 by heating and deforming the top of the fixing protrusion 16 protruding from the insertion hole 20 a of the bypass diode 20. Even with such a simple fixing method, not only the three heat radiating plates 31, 32 and 33 of the heat radiating section 30 but also the bypass diode 20 can be fixed to the box body 11 easily and reliably.

  Next, the heat radiating part 50 for the right bypass diode 20 will be described. The heat dissipating part 50 is different from the heat dissipating part 30 with respect to the left bypass diode 20 described above in that the heat dissipating part 50 is arranged symmetrically, and is the same in other respects. For this reason, detailed description is omitted. The heat dissipating part 50 is provided with an upper heat dissipating plate 51, a central heat dissipating plate 52, and a lower heat dissipating plate 53 that are arranged one above the other. 51, 52, 53 are sequentially placed in the box body 11, and further, the bypass diode 20 is placed on the upper radiator plate 51.

  Next, the heat radiating portion 40 for the center bypass diode 20 will be described. The central heat radiating part 40 is provided between the left and right heat radiating parts 30 and 50 described above, and is provided so as not to contact the left and right heat radiating parts 30 and 50. The heat radiating portion 40 is provided with an upper heat radiating plate 41, a central heat radiating plate 42, and a lower heat radiating plate 43 that are arranged one above the other. The upper, lower, and lower three heat sinks 41, 42, and 43 are sequentially placed in the box body 11, and the bypass diode 20 is placed on the upper heat sink 41.

  The upper heat radiating plate 41 and the lower heat radiating plate 43 have the same shape that is substantially T-shaped in plan view, and are arranged at positions that coincide with each other in plan view. The upper heat radiating plate 41 includes front and rear portions 41a extending in the front-rear direction and projecting portions 41b and 41b projecting left and right from the front end portion of the front and rear portions 41a (the same applies to the lower heat radiating plate 43). . An insertion hole 41c into which the fixing protrusion 16 of the box body 11 is inserted is formed in the front and rear portion 41a.

  On the other hand, the central heat radiating plate 42 is substantially T-shaped in plan view, and includes a front and rear portion 42a extending in the front-rear direction, and projecting portions 42b and 42b projecting left and right from the rear end of the front and rear portion 42a. . An insertion hole 42c into which the fixing protrusion 16 of the box body 11 is inserted is formed in the front and rear portion 42a. The central heat radiating plate 42 is disposed such that a part of the front and rear portions 42 a overlaps with a part of the front and rear portions 41 a and 43 a of the upper and lower heat radiating plates 41 and 43. Further, the fixing protrusion 16 of the box main body 11 is inserted into the insertion holes 41c, 42c, 43c of the heat radiating plates 41, 42, 43, whereby each of the heat radiating plates 41, 42, 43 is connected to the box main body 11. It is fixed to. A fixing member 24 for fixing the cable is placed on the central heat sink 42. In addition, the arrangement | positioning method in the box main body 11 of the three heat sinks 41, 42, and 43 of the thermal radiation part 40 is the same as that of the case of the thermal radiation part 30 mentioned above, and detailed description is abbreviate | omitted.

  As described above, the terminal box 10 is provided with the heat radiating portions 30, 40, and 50 for the bypass diodes 20. And since the heat sinks 31, 41, 51 on the upper side of the heat radiating portions 30, 40, 50 are in direct contact with the bypass diode 20, the heat of the bypass diode 20 can be efficiently released. Thereby, even when a package type diode having poor heat dissipation is used as the bypass diode 20, it is possible to avoid a temperature rise due to heat generation of the bypass diode 20.

  Moreover, since the heat sink of each heat radiating part 30,40,50 is divided | segmented into 3 sheets and it has been piled up and down, the total surface area of the heat sink of each heat radiating part 30,40,50 is large. Thus, the amount of heat released by the heat radiating plate of each heat radiating section 30, 40, 50 is increased. Therefore, compared with the case where each heat radiating part 30,40,50 is comprised with only one heat sink, the space for arrange | positioning the heat sink of the surface area required for heat radiation may be small. That is, the spread of the heat radiating plates of the heat radiating portions 30, 40, 50 in the two-dimensional direction (front and rear, left and right directions) can be suppressed, and the heat radiating plates can be efficiently arranged in a limited space in the box body 11. And efficient heat dissipation becomes possible. Thereby, even when a package type diode is used as the bypass diode 20, it is possible to efficiently prevent a temperature rise due to heat generation of the bypass diode 20. As a result, it is possible to reduce the size of the box body 11 and thus the terminal box 10, thereby realizing cost reduction. Further, the size reduction of the terminal box 10 reduces the filling amount of the silicone resin for insulation sealing, and the cost can be reduced.

  Here, a part of the heat radiating plates 32, 42, 52 in the center of the heat radiating portions 30, 40, 50 is disposed between the fixing member 24 for fixing the cable and the bottom of the box body 11. . Conventionally, the fixed member 24 has a dead space below the fixing member 24. In this example, however, a part of the heat radiating plates 32, 42, 52 in the center of the heat radiating portions 30, 40, 50 is added to the conventional dead space. By arranging the, the space inside the box body 11 can be used effectively. Furthermore, as described above, a part (rear part) of the terminal plate 60 is placed on the protruding portion (not shown) of the fixing member 24, and the terminal plate 60 is connected to the heat radiating plates of the heat radiating portions 30, 40, 50. It is designed not to touch. In this manner, the protruding portion (not shown) of the fixing member 24 is disposed so as to be sandwiched between the terminal plate 60 and the heat radiating plates (central heat radiating plates 32, 42, 52) of the heat radiating portions 30, 40, 50. Therefore, insulation can be secured stably. In addition, this makes it possible to shorten the distance between the terminal plate 60 and the heat radiating plates of the heat radiating portions 30, 40, 50 necessary for stable insulation. As a result, the vertical dimension of the box body 11 can be reduced. As a result, the terminal box 10 can be downsized.

  By using the terminal plate 60, as described below, it is possible to improve the workability of the connection work between the terminal plate 60 and the output end on the solar cell module side. Here, a thin metal foil (for example, copper foil) is usually provided at the output end on the solar cell module side, and this metal foil is the tip of the first and second terminal plates 61 and 62 of the terminal plate 60. The parts are connected by soldering. This soldering is performed in a state in which the metal foil at the output end on the solar cell module side is sandwiched between the tip portions of the first and second terminal plates 61 and 62 of the terminal plate 60. At this time, the alignment of the metal foil at the output end on the solar cell module side to the connection position of the terminal plate 60 is performed by inserting the metal foil between the tip portions of the first and second terminal plates 61 and 62. This can be done easily. Then, soldering can be performed in a state where the metal foil is sandwiched between the tip portions of the first and second terminal plates 61 and 62, and the connection between the terminal plate 60 and the output end on the solar cell module side is enabled. The workability of the work can be improved. Also, the soldering operation can be easily performed by using the solder layer 63 formed in advance on the first terminal board 61.

DESCRIPTION OF SYMBOLS 10 Terminal box 11 Box main body 12 Connection hole 13 Recess 14 for cable introduction Fixing base 14a Groove (recess)
15 Fixing protrusion 16 Fixing protrusion 20 Bypass diode 20a Insertion hole 22 Connection cable 23 External connection connector 24 Fixing member 30, 40, 50 Heat radiation part 31, 41, 51 Upper heat radiation plate 31a, 41a, 51a Front and rear part 31b, 41b, 51b Projection part 31c, 41c, 51c Insertion hole 32, 42, 52 Center heat sink 32a, 42a, 52a Front part 32b, 42b, 52b Projection part 32c, 42c, 52c Insertion hole 33, 43, 53 Lower side Radiation plates 33a, 43a, 53a Front and rear portions 33b, 43b, 53b Protruding portions 33c, 43c, 53c Insertion hole 60 Terminal plate 61 First terminal plate 62 Second terminal plate 61a Base portion 61b Diode connection portion 61c Cable connection portion 61d 62a Mounting hole 63 Solder layer

Claims (1)

In the terminal box for a solar cell module in which a plurality of terminal plates are provided in the box body, and a bypass diode is disposed between two terminal plates adjacent to each other among the plurality of terminal plates.
The box body includes a fixing protrusion on the bottom,
The terminal plate has an upper plate placed on the lower plate,
The upper and lower two plate-like bodies are fixed to the box body by the fixing protrusions,
A solder layer sandwiched between the plate-like bodies is formed at one end of the plate-like body,
The solar cell module terminal box, wherein the plate-like body is configured to sandwich and connect an output end on the solar cell module side between the solder layer and the other plate-like body.

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