JP2014113035A - Relay unit and solar power generating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a relay unit that prevents the occurrence of a leakage current and is excellent in safety and reliability, and to provide a solar power generating device.SOLUTION: A relay unit for electrically connecting a solar cell and a control device controlling an output from the solar cell includes: an electrical path board having an insulating base substrate and a plurality of conductor terminals exposed while being protruded from the base substrate; a first protective member in which the plurality of conductor terminals are disposed on its upper surface and having a first side surface that faces the base substrate; and a second protective member disposed on the upper surface of the first protective member, covering the plurality of conductor terminals, and having a second side surface that faces the base substrate. The first protective member has, on the upper surface between a first end portion and a second end portion, a plurality of first grooves in which the plurality of conductor terminals are each disposed, a second groove provided between the first grooves adjacent to each other, and a third groove reaching a lower surface from the first side surface so as to be continuous with the second groove.

Description

  A relay unit for electrically connecting a solar cell and a control device for controlling the output from the solar cell, and a control device for controlling the output from the solar cell via the relay unit The present invention relates to a photovoltaic power generation apparatus that is electrically connected.

  For example, the solar power generation device is configured to input power generated by a plurality of solar cell strings in which a plurality of solar cell modules are connected in series to a power conditioner that is a power conversion device, and supply power to a load. .

  Normally, output cables from a plurality of solar cell strings are connected in parallel by a relay unit. And the output from a some solar cell string is transmitted to the power conditioner side via a relay unit.

  When bundling output electric wires from such a plurality of solar cell strings, the relay unit that accommodates the electric wires is enlarged by routing the electric wires.

  For this reason, a structure has been proposed in which a metal bar is used instead of an electric wire and this is integrated with a relay unit (for example, see Patent Document 1 below).

JP-A-2005-116319

  When a large current is supplied to such a relay unit, there is a problem that the current leaks from the relay unit. For this reason, the relay unit excellent in safety | security and reliability which suppresses the fall of the insulation performance in a relay unit, and a solar power generation device using the same are desired.

  Therefore, one of the objects of the present invention is to provide a relay unit and a photovoltaic power generation apparatus that are excellent in safety and reliability, in which the occurrence of leakage current is suppressed.

  A relay unit according to an embodiment of the present invention is a relay unit for electrically connecting a solar cell and a control device that controls output from the solar cell, and protrudes from the insulating base and the base A circuit board having a plurality of conductor terminals exposed in a state, a first protection member having a plurality of the conductor terminals arranged on an upper surface and having a first side surface facing the base, and the first protection member And a second protective member that covers the plurality of conductor terminals and has a second side surface facing the base, wherein the first protective member includes a first end portion on the upper surface, A plurality of first grooves in which each of the plurality of conductor terminals is disposed between the second end, a second groove provided between the first grooves adjacent to each other, A third groove that continues to the second groove and reaches the lower surface from the first side surface; It is.

Moreover, the solar power generation device according to one aspect of the present invention includes a solar cell, a control device that controls output from the solar cell, and the relay unit that electrically connects the solar cell and the control device. And.

  According to the relay unit and the solar power generation device described above, even if moisture such as water droplets enters from the outside, this moisture can be easily released. Furthermore, since moisture can be prevented from entering the conductor terminal side as much as possible, it is possible to suppress a decrease in insulation of the relay unit over a long period of time.

  As a result, it is possible to provide a highly reliable relay unit and a photovoltaic power generation apparatus that suppress the generation of leakage current (decrease in dielectric strength performance) as much as possible.

FIG. 1 is a block diagram schematically showing one embodiment of a photovoltaic power generation apparatus according to one embodiment of the present invention. FIG. 2 is a perspective view schematically showing a part of the relay unit according to the embodiment of the present invention. FIG. 3 is an exploded perspective view schematically showing a part of the relay unit according to the embodiment of the present invention. 4 is a diagram schematically showing a part of the relay unit of FIG. 3, in which FIG. 4 (a) is a perspective view and FIG. 4 (b) is a side perspective view. FIG. 5 is an exploded perspective view showing a part of the relay unit according to the embodiment of the present invention. 6 is a diagram schematically showing a part of the relay unit of FIG. 5, FIG. 6 (a) is a perspective view, FIG. 6 (b) is a cross-sectional view along the line AA ′ in FIG. 6 (a), FIG. 6C is a cross-sectional view taken along the line BB ′ of FIG. 7A and 7B are diagrams schematically showing a part of the relay unit according to the embodiment of the present invention. FIG. 7A is a perspective view, and FIG. 7B is an AA view of FIG. FIG. 7C is a cross-sectional view taken along the line BB ′ of FIG. 7A. FIG. 8 is a diagram schematically showing a part of a relay unit according to an embodiment of the present invention, in which FIG. 8A is a perspective view and FIG. 8B is an AA view of FIG. FIG. 8C is a cross-sectional view taken along the line BB ′ of FIG. 8A. 9A and 9B are diagrams schematically showing a part of the relay unit according to the embodiment of the present invention, in which FIG. 9A is a perspective view, and FIG. 9B is an AA of FIG. 9A. 'Line sectional view, FIG. 9C is a sectional view taken along line BB ′ of FIG. 9A. 10A and 10B are diagrams schematically showing a part of the relay unit according to the embodiment of the present invention. FIG. 10A is a perspective view, and FIG. 10B is an AA view of FIG. 'Line sectional view, FIG. 10 (c) is a sectional view taken along line BB' of FIG. 10 (a). FIG. 11 is an exploded perspective view showing a part of the relay unit according to the embodiment of the present invention. 12 is a diagram schematically showing a part of the relay unit of FIG. 11, in which FIG. 12 (a) is a perspective view, FIG. 12 (b) is a cross-sectional view along line AA ′ of FIG. 12 (a), FIG. 12C is a cross-sectional view taken along the line BB ′ of FIG. FIG. 13 is a diagram schematically showing a part of a relay unit according to an embodiment of the present invention, in which FIG. 13 (a) is a perspective view, and FIG. 13 (b) is an AA of FIG. 13 (a). FIG. 13C is a cross-sectional view taken along the line BB ′ of FIG. 13A. FIGS. 14A and 14B are schematic views each schematically showing a part of a relay unit according to an embodiment of the present invention. 15A and 15B are diagrams schematically showing a part of the relay unit according to the embodiment of the present invention, in which FIG. 15A is a perspective view, and FIG. 15B is an AA of FIG. FIG. 15C is a cross-sectional view taken along the line BB ′ of FIG. FIG. 16 is a diagram schematically illustrating a part of the relay unit according to the embodiment of the present invention, in which FIG. 16A is a perspective view and FIG. 16B is an AA of FIG. 'Line cross-sectional view, FIG. 16 (c) is a cross-sectional view taken along line BB' of FIG. 16 (a).

  Hereinafter, embodiments of a relay unit and a photovoltaic power generation apparatus according to the present invention will be described in detail with reference to the drawings. In the drawings, similar constituent elements are denoted by the same reference numerals, and redundant description is omitted. Further, since the drawings are schematically shown, the sizes and positional relationships of the components in each drawing can be appropriately changed.

<Basic configuration of solar power generation device>
First, a basic configuration example of the solar power generation device will be described. As shown in FIG. 1, the solar power generation device S controls the output from one or more solar cells 1 composed of one or more solar cell strings 1a, 1b and the like. The output from the solar cell 1 is supplied to the control device 5 such as a power conditioner via the conductor terminal 3 in the relay unit 2 accommodated in the connection box 4 or the like. Further, the output from the control device 5 is supplied to the load 6 via the electric wire 94. Thus, the solar power generation device S has a configuration in which the solar cell 1 and the control device 5 that controls the output from the solar cell 1 are electrically connected via the relay unit 2. .

  Here, the electric wires 91 and 92 for taking out the output from the solar cell string 1a and the like and the electric wires 93 for inputting the output to the control device 5 are electrically connected to the plurality of conductor terminals 3 in the relay unit 2, respectively. It is connected.

  The solar cell 1 may be a variety of solar cells such as a single crystal or polycrystalline crystal solar cell, or a thin film solar cell such as an amorphous solar cell or a CIGS solar cell. In the present embodiment, the relay unit 2 is described as being housed in the connection box 4, but the present invention is not limited to such a mode. For example, the relay unit 2 may be accommodated in a terminal box provided in the solar cell module or in a control device 5 such as a power conditioner.

  Next, various embodiments of the relay unit 2 will be described in detail.

<Embodiment 1>
First, the relay unit 2 of Embodiment 1 is demonstrated. As shown in FIG. 2, a metal plate 50 made of a steel plate or the like called a base plate is arranged in the connection box 4 of FIG. 1, and a metal pole 51 made of a plurality of steel or the like is erected on the metal plate 50. The relay unit 2 is supported and fixed. Since the metal pole 51 is connected to the metal plate 50, as shown in the figure, a ground wire 52 for grounding the metal plate 50 is provided above the metal pole 51 that fixes the relay unit 2. It is good to fix to the fastening part 27 (grounding wire connection part). Note that FIG. 2 illustrates a part of the relay unit 2 (part to which the electric wire 91 is connected in FIG. 1).

The circuit board 21 has an insulating base 20 and a plurality of conductor terminals 3 exposed in a state of protruding from the base 20. In addition, the relay unit 2 includes an electrical circuit board 21, a first protective member 22 having a plurality of conductor terminals 3 disposed on the upper surface, and a first side surface facing the base body 20 of the electrical circuit board 21,
The second protective member 23 is disposed on the upper surface of the first protective member 22 so as to cover the plurality of conductor terminals 3 and the second side surface faces the base body 20. A screw for electrically connecting the terminal 54 and the conductor terminal 3 is provided on the second protective member 23, and the terminal 54 is a round crimp terminal or a Y-shaped crimp terminal.

As shown in FIG. 3, the relay unit 2 includes an insulating base 20 and a side surface 20 of the base 20.
It has the electrical circuit board 21 provided with the conductor terminal 3 exposed in the state which protruded from a. The conductor terminal 3 is composed of a plurality of, for example, copper plates or aluminum plates. Further, the relay unit 2 includes a first protection member 22 in which the plurality of conductor terminals 3 of the circuit board 21 are disposed, and a second protection member 22 that is disposed on the upper surface of the first protection member 22 and covers the plurality of conductor terminals 3 from above. And a protective member 23.

  The first protective member 22 has a plurality of first grooves 22c, a plurality of second grooves 22d, and a plurality of third grooves 22g. The plurality of first grooves 22c are located at an interval from the first end 22a side to the second end 22b side on the upper surface of the first protective member 22, and each of the plurality of conductor terminals 3 is disposed. ing. The second groove 22d is located between the first grooves 22c adjacent to each other, and between the first groove 22c located at the end and the end of the first protection member 22. Further, the third groove 22g is connected to the second groove 22d and reaches the lower surface 22f via the side surface 22e on the side where the electrical circuit board 21 of the first protective member 22 is located. Note that the groove length and the groove width of the second groove 22d can be appropriately set in consideration of air permeability and the like so that the occurrence of condensation can be further suppressed.

  As shown in FIGS. 2 to 4, the conductor terminal 3 is sandwiched between the first protection member 22 and the second protection member 23, but the first protection member 22 and the second protection member 23 are not shown in FIG. 4. As shown in FIG. 4, the fastening portion 27 on the first end portion 22a side and the second end portion 22b side of the first protective member 22 can be fastened and fixed with screws and nuts.

  In the present embodiment, the circuit board 21 is made of a thermoplastic resin such as insulating polyphenylene sulfide (PPS) or polycarbonate (PCB). And if the 1st protection member 22 and the 2nd protection member 23 are comprised with thermosetting resins, such as a phenol resin, an epoxy resin, and a urea resin, manufacture of the relay unit 2 will become easy, especially a 1st protection member. The heat resistance of the 22 and the second protective member 23 may be good. Note that the first protective member 22 and the second protective member 23 may be made of a thermoplastic resin in the same manner as the circuit board 21.

  The first protective member 22 and the second protective member 23 fasten the through hole 41 and the through hole 42 at the fastening portion 27 using screws, screw holes, or bolts and nuts. Then, the relay unit 2 is completed by attaching the screw 26 electrically connected to the conductor terminal 3 to the upper part of the second protective member 23 through the through holes 40 and 43.

  Due to the groove structure of the second groove 22d and the third groove 22g provided in the first protective member 22, there is a gap between the adjacent conductor terminals 3 or between the conductor terminals 3 and the fastening portion 27 (or the ground wire 52). Secured. Thereby, the insulation between the conductor terminals 3 is improved, and when condensation is formed in the vicinity of the conductor terminals 3, moisture is transferred into the relay unit 2 by the ventilation structure and the drainage structure by the second groove 22d and the third groove 22g connected to the second groove 22d. Even if it penetrates, it becomes possible to shorten the time until the insulation between the conductor terminals 3 is restored. And since it can suppress that the insulation of the relay unit 2 falls over a long time as much as possible, the insulation of the relay unit 2 is improved.

  Further, the creepage distance is increased due to the presence of the second groove 22d between the conductor terminals 3, so that the resistance value against the leakage current can be increased and the leakage current can be reduced. Furthermore, since the gap between the first protective member 22 and the second protective member 23 can be narrowed, it is possible to make it difficult to suck moisture such as water droplets by capillary action.

  The depth and width of the second groove 22d are desirably a size (or a cross-sectional area) at which water droplets can easily escape. The second groove 22d has a depth of about 1 mm and a width of about 5 mm, for example, to improve air permeability and make it difficult for condensation to occur, and to generate leakage current between the conductor terminals 3 (withstand voltage performance). Can be suppressed.

<Embodiment 2>
Next, the relay unit 2 of Embodiment 2 is demonstrated. As shown in FIGS. 5A and 5B and FIGS. 6A and 6B, the end of the second groove 22d provided in the first protective member 22 on the electrical circuit board 21 side (the first protective member 22). The third groove 22g is provided in the direction orthogonal to the second groove 22d on the side portion on which the electrical circuit board 21 is disposed. Furthermore, the second protective member 23 has a fourth groove 23a that is continuous with the second groove 22d of the first protective member 22 and reaches the upper surface from the lower surface of the second protective member 23 via the side surface. ing.

  The third groove 22g and the fourth groove 23a serve to satisfactorily separate the second groove 22d and the circuit board 21. For this reason, even if the dust is accumulated in the second groove 22d and the tracking phenomenon occurs, the circuit board 21 is carbonized by the heat and the conductive terminals 3 are not electrically conductive. .

  Therefore, as shown in FIGS. 6A to 6C, the third groove 22 g is an upper surface of the second protective member 23 in a state where the first protective member 22 and the second protective member 23 are assembled to the circuit board 21. To the lower surface of the first protective member 22, and the third groove 22g communicates with the second groove 22d. Further, as shown in FIG. 6 (b), the first groove 22c with the conductor terminal 3 and the portion without the groove portion do not have the third groove 22g, so the portion where the second groove 22d is in contact with the circuit board 21 is opened. By setting the state, it plays a role of improving the insulation performance between the conductor terminals 3. In addition, it is difficult for dust to accumulate on the electric circuit board 21 side in the second groove 22d, and the occurrence of a tracking phenomenon or the like can be suppressed.

<Embodiment 3>
Next, the relay unit 2 of Embodiment 3 is demonstrated. As shown in FIGS. 7A to 7C, in addition to the configuration of the second embodiment, the relay unit 2 of the present embodiment has a second groove of the first protective member 22 on the lower surface of the second protective member 23 as well. A fifth groove 23c facing 22d is provided.

  According to the relay unit 2 of the third embodiment, the second groove 22d and the fifth groove 23c are included. In this way, a shallow lateral groove can be formed by opposing shallow grooves. Moreover, the cross-sectional area cut | disconnected in the direction orthogonal to the longitudinal direction of a through-hole can be enlarged. As a result, a wide cross-sectional area can be easily secured, and water such as water droplets can be easily discharged. Further, the air permeability is improved by the second groove 22d and the fifth groove 23c, so that it is difficult for condensation to occur, and generation of leakage current can be suppressed as much as possible. And since the 1st protection member 22 and the 2nd protection member 23 each increase a creepage distance, the further improvement of the dielectric strength performance of the relay unit 2 can be anticipated.

  Further, as shown in FIG. 7B, the spatial distance in the height direction of the through hole constituted by the second groove 22d and the fifth groove 23c can be increased, and a structure in which a leak current hardly flows can be obtained.

<Embodiment 4>
Next, the relay unit 2 of Embodiment 4 is demonstrated. As shown in FIGS. 8A to 8C, the thickness when the first protective member 22 and the second protective member 23 are combined may be larger than the thickness of the circuit board 21. Alternatively, in the assembly in which the first protection member 22 and the second protection member 23 are combined and the side surface (the first side surface of the first protection member 22) facing the electrical circuit board 21 connected to the assembly, It may be wider than the side surface of the electrical circuit board 21 so that an exposed portion 30 in which a part of the side surface of the assembly (for example, a part of the first side surface of the first protection member 22) is exposed may be generated. That is, for example, the first side surface of the first protection member 22 is wider than the region facing the base body 20. For example, when the second groove 22d provided in the first protection member 22 is brought into contact with the side surface of the circuit board 21, an exposed portion 30 that does not face the circuit board 21 is formed, so that the relay unit 2 is connected to the relay unit 2 from the second groove 22d. You may comprise so that a water | moisture content may flow outside. Thereby, air permeability can be improved similarly to embodiment mentioned above, and generation | occurrence | production of the leakage current between the conductor terminals 3 can be suppressed as much as possible.

<Embodiment 5>
Next, the relay unit 2 of Embodiment 5 is demonstrated. As shown in FIGS. 9A to 9C, in addition to the configuration of the third embodiment, the end of the circuit board 21 on the second protection member 23 side is also provided with the fourth groove 23 a of the second protection member 23. You may provide the 6th groove | channel 21b which opposes.

  According to the relay unit 2 of the present embodiment, by providing the sixth groove 21b in the electrical circuit board 21, the through-holes configured by the fourth groove 23a of the second protective member 23 and the sixth groove 21b in the electrical circuit board 21 are provided. The size can be expanded and the air permeability can be improved. Thereby, in addition to the effect similar to embodiment mentioned above, the size of the 2nd groove | channel 22d etc. of the 1st protection member 22 can be made small, and the relay unit 2 which can be reduced in size can be provided. .

<Embodiment 6>
Next, the relay unit 2 of Embodiment 6 will be described. As shown in FIGS. 10A to 10C, in addition to the configuration of the third embodiment, a groove-like void portion 31 is provided at an interval in a portion where the first protection member 22 and the circuit board 21 face each other. You may be able to. That is, it is preferable that a groove is formed between the first side surface of the first protective member 22 and the base body 20 of the circuit board 21.

  When the first protective member 22 and the like are in close contact with the circuit board 21, a leak current may be generated at the close contact portion. According to the relay unit 2 of the sixth embodiment, the circuit board 21 and the first protection member 22 face each other through the groove-shaped void portion 31, and therefore, between the conductor terminals 3 as in the above-described embodiment. Generation of leakage current can be suppressed as much as possible.

  Here, since it is sufficient if there is a void portion 31 between the first protection member 22 and the circuit board 21, the size of the first protection member 22 can be reduced, or a recess or the like can be provided on the circuit board 21 side. That's fine. For example, in the example shown in FIGS. 10A to 10C, the first protective member 22 is provided with the void portion 31 by making the length of the conductor terminal 3 in the longitudinal direction shorter than that of the second protective member 23. .

<Embodiment 7>
Next, the relay unit 2 of Embodiment 7 is demonstrated. As shown in FIGS. 11 and 12 (a) to 12 (c), in addition to the configuration of the third embodiment, a step 22h in which a part of the first protective member 22 is notched is provided at the end of the first protection member 22 on the circuit board 21 side. Further, a step 23d with a part cut away is provided at the end of the second protection member 23 on the electrical circuit board 21 side, and the first protection member 22 and the second protection member 23 are combined to form the void portion 32. You may comprise so that it may become. That is, the cavity portion 32 that communicates with the first groove 22 c, the second groove 22 d, and the third groove 22 g of the first protection member 22 on the first side surface of the first protection member 22 and the second side surface of the second protection member 23. May be provided. Note that a recess may be provided in the base 20 of the circuit board 21 instead of the void portion 32 constituted by the step 22h and the step 23d.

  According to the relay unit 2 of the seventh embodiment, since the first protection member 22 and the second protection member 23 are fixed in contact with the circuit board 21 side, the first protection member 22 and the second protection member 23. And the electrical circuit board 21 can be firmly integrated, and the relay unit 2 with high strength against bending and high reliability can be provided.

<Eighth embodiment>
Next, the relay unit 2 of Embodiment 8 will be described. As shown in FIG. 13, the relay unit 2 of the eighth embodiment is different from the third groove 22 g of the first protective member 22 and the fourth groove 23 a of the second protective member 23 in the configuration of the seventh embodiment. A space portion 33 is provided at a predetermined interval between the protective member 22, the second protective member 23, and the circuit board 21.

  According to the eighth embodiment, as shown in FIGS. 14 (a) and 14 (b), the exposed portion of the conductor terminal 3 in the void portion 33 is bent to include the first protective member 22 and the second protective member 23. The assembly can be tilted with respect to the circuit board 21.

  For example, as shown in FIG. 14A, when the circuit board 21 is mounted horizontally with respect to the distribution board 41 by a pole 42 that is a support body of the circuit board 21, the operator who performs wiring to the relay unit 2 is The assembly side composed of the first protective member 22 and the second protective member 23 can be lowered (the conductor terminal 3 in the void portion 33 is bent downward). Thereby, work such as screwing can be easily performed in a state where the assembly is inclined, and workability may be improved.

  On the other hand, for example, as shown in FIG. 14B, when the switchboard 41 is installed on a wall or the like standing perpendicular to the horizontal plane, and the pole 42 is attached to the switchboard 41 vertically with respect to the switchboard 41. The operator can easily perform the work such as screwing in a state where the assembly side is raised to the front (the conductor terminal 3 in the void portion 33 is bent toward the front) and is inclined, and the workability is improved. So good.

<Ninth Embodiment>
Next, the relay unit 2 of Embodiment 9 will be described. As illustrated in FIGS. 15A to 15C, the relay unit 2 of the ninth embodiment has a structure in which the structure of the eighth embodiment is applied to the third embodiment. That is, in the configuration of the third embodiment, a void portion 34 with an appropriate space is provided between the first protection member 22, the second protection member 23, and the circuit board 21.

  Since the 1st protection member 22 and the 2nd protection member 23 are another parts retrofitted to the electrical circuit board 21, a clearance gap may be produced between the electrical circuit board 21 due to manufacturing errors. In some cases, the gap is intentionally increased to tilt the assembly of the first protection member 22 and the second protection member 23 as described in the eighth embodiment. However, in consideration of dimensional errors at the time of manufacture, the space portions are not always spaced sufficiently for insulation. Further, as shown in FIG. 14, even when the assembly is inclined, the first protective member 22 or the second protective member 23 and the electrical circuit board 21 can be brought close to each other by this inclination.

  As in the relay unit 2 of the ninth embodiment, the first protection member is provided regardless of whether the first protection member 22 or the second protection member 23 is in contact with the circuit board 21 by providing the space portion 34 having a wide interval. 22, it is difficult for dust to accumulate between the second protective member 23 and the circuit board 21, and the occurrence of tracking phenomenon and leakage current can be suppressed. Moreover, since the ventilation path is comprised by the space part 34, the conductor terminal 3 can be cooled suitably.

<Embodiment 10>
Next, the relay unit 2 according to the tenth embodiment will be described. As shown in FIGS. 16A to 16C, the relay unit 2 of the tenth embodiment has a structure in which a plurality of fourth grooves 23 a provided in the second protective member 23 are communicated in common with the void portion 35. Have. As described above, in the relay unit 2 of the tenth embodiment, the first protection member 22 and the second protection member 23 can be brought into contact with the circuit board 21 at the side surface portion other than the void portion 34. It is a thing. Thereby, the bending strength of the assembly of the first protection member 22 and the second protection member 23 is improved, and the air passage is configured by the void portion 35 in the same manner as in the ninth embodiment. The cooling effect of the conductor terminal 3 is obtained. Further, as in the ninth embodiment, since dust does not easily accumulate between the assembly and the circuit board 21, the occurrence of tracking phenomenon and leakage current is suppressed.

1: solar cell 2: relay unit 3: conductor terminal 4: connection box 5: control device 6: load 20: base 21: circuit board 21b: sixth groove 22: first protective member 22a: first end 22b: first 2 end 22c: first groove 22d: second groove 22g: third groove 23: second protective member 23a: fourth groove 23c: fifth groove 26: screw 27: fastening portions 31, 32, 33, 34: empty Tokoro S: Solar power generator

Claims (8)

A relay unit for electrically connecting a solar cell and a control device for controlling the output from the solar cell,
An electrical circuit board having an insulating base and a plurality of conductor terminals exposed in a protruding state from the base;
A plurality of the conductor terminals disposed on the upper surface, a first protective member having a first side surface facing the base;
A second protective member disposed on an upper surface of the first protective member, covering the plurality of conductor terminals, and having a second side surface facing the base body,
The first protective member includes a plurality of first grooves in which each of the plurality of conductor terminals is disposed between a first end and a second end on the upper surface;
A second groove provided between the first grooves adjacent to each other;
A relay unit having a third groove that continues to the second groove and reaches the lower surface from the first side surface.   The said 2nd protection member has the 4th groove | channel which continues to the said 2nd groove | channel of the said 1st protection member, and has reached the upper surface from the lower surface of the said 2nd protection member via the side surface. The relay unit described in 1.   3. The relay unit according to claim 1, wherein the second protection member has a fifth groove facing the second groove of the first protection member on a lower surface.   The relay unit according to any one of claims 1 to 3, wherein the first side surface of the first protection member is wider than a region of the electrical circuit board facing the base.   5. The relay unit according to claim 1, wherein the circuit board has a sixth groove facing the fourth groove of the second protection member in the base. 6.   The relay unit according to any one of claims 1 to 5, wherein a gap is formed between the first side surface of the first protection member and the base body of the circuit board.   On the first side surface of the first protective member and the second side surface of the second protective member, there are void portions communicating with the first groove, the second groove, and the third groove of the first protective member. The relay unit according to claim 1, wherein the relay unit is provided.   A solar cell, a control device that controls an output from the solar cell, and the relay unit according to any one of claims 1 to 7 that electrically connects the solar cell and the control device. Solar power generator.

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