JP6086181B2 - Photovoltaic module, photovoltaic panel, and flexible printed wiring board for photovoltaic module - Google Patents

Description

  The present invention relates to a photovoltaic power generation module, a photovoltaic power generation panel, and a flexible printed wiring board for a photovoltaic power generation module, and more specifically, a wiring pattern to which a high voltage is applied by connecting power generation elements in series. The present invention relates to a photovoltaic power generation module, a photovoltaic power generation panel, and a flexible printed wiring board for a photovoltaic power generation module that have improved dielectric breakdown resistance.

  Solar power generation is widely used in many countries as renewable energy. Since full-scale spread has just started, a serious problem that has never existed before appears. For example, there is a problem of dielectric breakdown resistance. There are few examples that show how to deal with this from the front, but there are several suggestions in the technical field similar to this. For example, insulation such as solar cells and wiring may be broken, causing electric leakage or ground fault, and a solar power generation system that detects the ground fault location has been proposed (Patent Document 1). In addition, a protection sheet for a photovoltaic power generation module for withstanding severe weather conditions that cause dielectric breakdown and electric leakage has been proposed (Patent Document 2).

JP 2010-199443 A JP 2010-135349 A

  However, the main cause of dielectric breakdown such as leakage is the severe weather conditions and not the high voltage generated as a result of solar power generation in the solar cell module. Among solar power generation, for example, in concentrating solar power generation, a large power generation capacity is realized by making sunlight condensed by a lens incident on a power generation element made of a compound semiconductor with high power generation efficiency. . In such concentrating solar power generation, a large number of power generation elements are connected in series, so that the potential is several hundred volts at a specific location in the solar power generation module or a specific location in the solar power generation panel. To reach thousands of volts. Usually, the power generating elements are conductively connected with a strip-shaped copper foil pattern or the like, and the potential of several hundred volts to several thousand volts is applied to the copper foil pattern. The photovoltaic power generation panel is formed on the housing, but the copper foil pattern is supported on an insulating base material such as polyimide resin, and is insulated from the housing by the insulating base material. The insulating base material has a thickness of about several tens of μm, and since the thickness is thin, dielectric breakdown tends to occur particularly at the edge of the copper foil pattern due to a high electrostatic voltage.

  Now that huge solar power generation facilities are being built in many places, the voltage in the solar power generation device is considered to increase as the facilities become larger, regardless of the type of solar power generation. For this reason, dielectric breakdown due to static voltage is not limited to the above-described concentrating solar power generation module and the like, and is an important issue to be dealt with. In addition, in the equipment that generates the potential of several hundred volts to several thousand volts, dielectric breakdown actually occurs.

  The present invention relates to a photovoltaic power generation module, a photovoltaic power generation panel, and a flexible printed wiring board for a photovoltaic power generation module capable of preventing dielectric breakdown due to static voltage in photovoltaic power generation including concentrating photovoltaic power generation. The purpose is to provide.

The solar power generation module of the present invention includes a power generation element. This photovoltaic power generation module includes a support and a flexible printed wiring board having an electrode portion on which the power generation element is installed on the support, and the flexible printed wiring board has an insulating base material layer for insulating, and A conductive layer pattern composed of a metal layer fixed to the insulating base layer and connecting the power generating elements in series, and the conductive layer pattern is located between the continuous portion and the continuous portion It consists discontinuous portion which intermittently, the electrode portion is located in a pair to the power generation unit of the cross connection portion, along the edge of the continuous portion of the front Kishirube conductive layer pattern, the insulating base material with the edge Covering the step so as to fill the step with the layer, and comprising a dielectric breakdown prevention film continuously disposed over the continuous portion and the intermittent portion , the insulating base material layer continuously over the conductive layer pattern including the intermittent portion, The conductive layer pattern and support And it is located in a band between the body.

Discharges that cause dielectric breakdown tend to occur near the edges of the conductive layer pattern that conducts to the electrodes, particularly near the corner tips at the steps with the underlying insulating base layer. As described above, the conductive layer pattern connects the power generating elements in series. Therefore, when the number of series stages increases, a portion having a very high potential occurs at a predetermined position near the final stage. Since the conductive layer pattern is fixed to an insulating base layer having a thickness of, for example, several tens of μm, the distance from the support is small even though the insulating base layer is interposed therebetween. As a result, discharge occurs between the vicinity of the edge of the conductive layer pattern having a high potential and the support, resulting in dielectric breakdown. For example, the normal DC breakdown voltage of dry air is 3 MV · m ⁻¹ (3 kV / mm). Assuming that an insulating substrate layer having a thickness of 20 μm is interposed, the dielectric breakdown voltage of dry air is converted to about 300 V / 20 μm (15 kV / mm), so that a conductive layer near the final stage in which a large number of power generating elements are connected in series. In the pattern portion, the possibility of dielectric breakdown is quite high. Even if it does not proceed to dielectric breakdown at once, there are many cases where dielectric breakdown is caused by something after partial discharge continues.
If dielectric breakdown occurs at any one place in the entire conductive layer pattern on which the power generation elements connected in series are placed, the voltage will not rise and will not function as a power generation device.
The support may have any form as long as it has a flat bottom plate for placing the flexible printed wiring board, such as a flat plate, a flat rectangular parallelepiped with an upper surface, etc. Good. The material can be anything. A protective sheet or the like may be interposed between the support and the flexible printed wiring board.

As described above, by disposing a dielectric breakdown prevention film so as to fill the step with the underlying insulating base material layer at the edge of the conductive layer pattern, air with low dielectric breakdown resistance such as air and gas components is excluded. Thus, the dielectric breakdown resistance can be improved. The functions of the dielectric breakdown prevention film are as follows: (E1) Arranging an object having a high dielectric breakdown voltage instead of air; (E2) Loose gradient over a wide range of local steep potential distribution at the edge of the conductive layer pattern. Based on the potential gradient.
Although the electric potential is increased in the latter stage by the power generation elements connected in series, the dielectric breakdown prevention film may be arranged in the above-described form only in the region where the electric potential is higher than the predetermined electric potential, or in the entire region regardless of the electric potential. You may arrange.
In the case of (E1), the dielectric breakdown prevention film can further contribute to preventing dielectric breakdown not only against a DC voltage or an electrostatic voltage but also against a surge voltage such as lightning.

The dielectric breakdown prevention film is preferably formed of any one of an insulating material and a resistor.
The insulating material has a high breakdown voltage as described above. For example, in polyethylene terephthalate which is known to have high insulation performance, for example, the dielectric breakdown voltage is 300 kV / mm, and the volume resistivity is 5 × 10 ¹⁸ Ωcm. Such an insulating material can improve the dielectric breakdown resistance mainly by the function (E1). Among the functions of (E1), an operation that hardly causes partial discharge is included as an important factor. The insulating material may be any resin, glass fiber, or mica material. Resin is preferable because it is easy to handle to fill the step at the end of the conductive layer pattern.
In addition, in the resistor, for example, a resistor having a volume resistivity of 1 kΩcm to several tens of MΩcm is disposed so as to fill the step from the edge of the conductive layer pattern to the insulating base material layer. The potential distribution can be changed to a relaxed gradient potential distribution over a wide range. That is, the function of (E2) is mainly operated. As a result, the distribution of the lines of electric force concentrated on the corners of the conductive layer pattern located at the upper part of the stepped portion can be dispersed in the peripheral portion of the corner and the potential gradient can be relaxed. Thereby, the dielectric breakdown resistance can be improved. Any material can be used for the resistor as long as it has an appropriate resistance value and is easy to handle when it is arranged so as to fill the step at the end of the conductive layer pattern. For example, a resin containing a conductive filler can be used.

The dielectric breakdown prevention film can be configured to have a width so as to fill each step up to the edge of the conductive layer pattern, the end of the insulating base material layer, and the surface of the support.
By using a wide dielectric breakdown prevention film as described above, both the steps of the conductive layer pattern / insulating base layer and the step of insulating base layer / support can be filled. For this reason, the insulating material can more reliably exhibit the function (E1) and the resistor can function (E2). As a result, the dielectric breakdown resistance can be further increased.
In addition, the above-mentioned level difference fills the level difference between the end surface of (conductive layer pattern + insulating base material layer) and the support when, for example, the end surface of the conductive layer pattern and the end surface of the insulating base material layer are almost aligned. As described above, the above-described function (E1) or (E2) can be obtained by disposing the dielectric breakdown prevention film.

In the conductive layer pattern, on the insulating base material layer, strip-shaped continuous portions and intermittent portions between the continuous portions are alternately arranged, and the electrode portion of the power generation element is positioned at the power generation portion in the intermittent portion. Then, one of the electrodes forming a pair is conductively connected to the continuous part on one side facing the intermittent part, and the other electrode is conductively connected to the continuous part on the other side facing the intermittent part. You can
As a result, the power generating elements are connected in series by the conductive layer pattern, and the potential of the conductive layer pattern located in the subsequent stage becomes higher. Said dielectric breakdown prevention layer is more regions predetermined potential or the entire region without regard to potential, along the edge of the continuous portion of the conductive layer pattern, and with the edge the insulating base layer While covering so that a level | step difference may be filled, it can arrange | position continuously over the said continuous part and an intermittent part .
The intermittent portion is not necessarily a rectangular region orthogonal to the edge direction of the continuous portion. For example, it extends thinly from the edge of one continuous part to a continuous part on the other side located across the interrupted part, and the other side retreats accordingly and dents into an L shape, and the extended continuous part and L It may be a form (planar shape) between the continuous parts recessed in a letter shape. In addition, a backflow preventing diode may be disposed in the intermittent portion having such a configuration. The diode electrically connects and disconnects both continuous parts during normal power generation.
In addition, an installation part (a pedestal, an electrode part, etc.) for installing the power generation element may be formed in the intermittent part. The installation portion includes a pedestal that is conductively connected to one electrode of the power generation element and conductively connected to the continuous portion on one side, and an electrode portion that is conductively connected to the other electrode and conductively connected to the continuous portion on the other side. . This makes it very easy to install a huge number of power generating elements, and enables automation and the like.

The dielectric breakdown prevention film can be continuously disposed at least along the edge of the conductive layer pattern over the continuous portion and the intermittent portion of the conductive layer pattern.
When the dielectric breakdown prevention film is disposed in the vicinity of the power generation element, there are intermittent portions where the conductive layer pattern is interrupted. However, the dielectric breakdown prevention film is continuously disposed including the intermittent portions. As a result, the work of disposing the dielectric breakdown prevention film can be efficiently performed, and the dielectric breakdown resistance can be reliably improved.

The dielectric breakdown prevention film can be arranged so as to cover the entire width of the conductive layer pattern and fill in the steps at both ends of the conductive layer pattern except for the region of the power generation unit where the power generation element is arranged. .
As a result, in the laminating process in the production of the flexible printed wiring board, it is relatively time-consuming to arrange the dielectric breakdown prevention film only on the edge of the conductive layer pattern. On the other hand, it is relatively easy to dispose the dielectric breakdown prevention film over the entire width including both end edges of the conductive layer pattern. Further, from the viewpoint of preventing dielectric breakdown, it is preferable to dispose it over the entire width. It is particularly preferable when the dielectric breakdown prevention film is made of a resistor.

The solar panel of the present invention is characterized in that any one of the above-described solar power generation modules is arranged in a planar shape.
Accordingly, a solar panel having excellent dielectric breakdown resistance can be obtained, so that a photovoltaic power generation module can be connected in multiple stages to obtain electric power with a high potential that is easy to use and store.

The flexible printed wiring board for photovoltaic power generation modules of this invention is a flexible printed wiring board contained in the photovoltaic power generation module. Insulating base material layer, conductive layer pattern fixed to the insulating base material layer and formed of strip-shaped metal layers, and intermittent portions between the continuous portions, and a power generation portion in the intermittent portion The power generating element positioned on the paired electrodes, and covering so as to fill a step between the edge of the continuous portion of the conductive layer pattern and the insulating base material layer, and over the continuous portion and the intermittent portion And a power generation element, wherein one of the paired electrodes is electrically connected to a continuous portion on one side facing the intermittent portion, and the other is the intermittent portion. The insulating base layer is continuously connected over the conductive layer pattern including the intermittent portion and is located in a strip shape below the conductive layer pattern. And
Thereby, a flexible printed wiring board including power generation elements connected in series in multiple stages can be obtained. The dielectric breakdown prevention film is not arranged in the form of a flexible printed wiring board, and may be arranged at the stage where the solar module including the support is completed. That is, after being manufactured as a flexible printed wiring board for a photovoltaic power generation module, a dielectric breakdown prevention film may be formed for the first time at the stage where a photovoltaic module including a support is completed. The flexible printed wiring board for a photovoltaic power generation module of the present invention shows a form including such a case.

The flexible printed wiring board for a photovoltaic power generation module may include a dielectric breakdown prevention film that covers at least the edge of the conductive layer pattern so as to fill a step between the edge and the insulating base material layer.
As a result, the dielectric breakdown prevention film is disposed in the flexible printed wiring for photovoltaic power generation module itself, regardless of the support, and the dielectric breakdown prevention film is disposed at the time of or after the attachment to the support. Can be omitted.

In the flexible printed wiring board for a photovoltaic power generation module, the dielectric breakdown prevention film covers the entire width of the conductive layer pattern except for the region of the power generation unit where the power generation element is disposed, and steps at both edges of the conductive layer pattern Can be arranged to fill.
As a result, in the laminating process in the production of the flexible printed wiring board, it is relatively time-consuming to arrange the dielectric breakdown prevention film only on the edge of the conductive layer pattern. On the other hand, it is relatively easy to dispose the dielectric breakdown prevention film over the entire width including both end edges of the conductive layer pattern. Further, from the viewpoint of preventing dielectric breakdown, it is preferable to dispose it over the entire width. It is particularly preferable when the dielectric breakdown prevention film is made of a resistor.

  According to the solar power generation module and the like of the present invention, dielectric breakdown due to static voltage can be prevented in solar power generation including concentrating solar power generation.

It is a figure which shows the solar power generation module in Embodiment 1 of this invention. It is the elements on larger scale of the flexible printed wiring board of FIG. 2 is a partial plan view of a photovoltaic power generation module 50 or a flexible printed wiring board 10. FIG. (A) is sectional drawing which follows the IVA-IVA line | wire of FIG. 3, (b) is an enlarged view of the edge of a conductive layer. The modification in Embodiment 1 is shown, (a) is a top view, (b) is sectional drawing which follows the VB-VB line | wire. It is a top view which shows the photovoltaic power generation module or flexible printed wiring board in Embodiment 2 of this invention. (A) is sectional drawing which follows the VIIA-VIIA line | wire of FIG. 6, (b) is sectional drawing of a conventional one.

(Embodiment 1)
FIG. 1 is a diagram showing a photovoltaic power generation module 50 according to Embodiment 1 of the present invention. This solar power generation module is a concentrating type. In the photovoltaic power generation module 50, the flexible printed wiring board 10 is arranged in parallel or in a U shape while being folded at one place on the folded portion on the bottom surface 11b of the storage box 11 as a support. The power generating element 5 is connected in series for each flexible printed wiring board 10 and finally outputs a high voltage as will be described later. In the module of FIG. 1, a relatively small number of power generating elements are connected in series, but a larger number of power generating elements are connected in series, and there is a tendency that a high-potential conductive layer portion is generated.
A flange portion 11f is formed on the upper surface of the side wall of the storage box 11, and the lid-shaped light collector 13 is fixed in contact with the flange portion 11f. The light collector 13 is formed with a Fresnel lens 13 f aligned with the power generation element 5 fixed to the flexible printed wiring board 10. One Fresnel lens 13 f is provided for each power generation element 5. The light collector 13 is preferably a glass plate used as a base material and a silicone resin film formed on the back surface (inner side). The Fresnel lens 13f is formed on this silicone resin film. A connector 14 for taking out the output of the photovoltaic power generation module 50 through the side wall of the storage box 11 to the outside is provided.

In the present embodiment, as shown in FIG. 2, the flexible printed wiring board 10 is covered with the dielectric breakdown prevention film 3 except for the power generation unit G. In the present embodiment, the dielectric breakdown preventing film 3 is composed of an insulating film. For this reason, the reference numeral 3 is used for the insulating film 3 as a dielectric breakdown preventing film only in this embodiment. In the power generation unit G, the insulating film 3 is provided with an opening 3h so as not to block light. The end of the insulating film 3 remains on the upper surface of the insulating base material layer 1b.
FIG. 3 is a partial plan view of the photovoltaic power generation module 50 or the flexible printed wiring board 10. In the plan view shown in FIG. 3, although the conductive layer pattern 1a is located under the insulating film 3, it is easy to identify and cannot be mistaken. This is different from FIG. 2 which is a perspective view. In FIG. 2, there are many straight lines, and for easy identification, the conductive layer pattern 1 a located in the lower layer is easily distinguished using a broken line. 4A is a cross-sectional view taken along the line IVA-IVA in FIG.
The insulating base layer 1b is fixed in contact with the bottom surface 11b of the support, and the conductive layer pattern 1a is fixed on the insulating base layer 1b. And the insulating film 3 is arrange | positioned so that the edge of the conductive layer pattern 1a may be covered and the level | step difference of the conductive layer pattern 1a and the insulating base material layer 1b may be filled up. As described above, the region not covered with the insulating film 3 is the opening 3h, and corresponds to a part of the power generation part G or the intermittent part D of the conductive layer pattern 1a. The opening 3h is provided with power generation element installation portions 5a and 5b, and a power generation element (not shown) is mounted on the pedestal (also an electrode portion) 5b of the installation portion while the bottom electrode is conducted. The other of the paired electrodes is conductively connected to the electrode portion 5a. One conductive layer and the other conductive layer are electrically separated from each other with the disconnected portion D interposed therebetween, but a diode 6 for preventing backflow is provided as a bridge.

<Points of this embodiment>
As shown in the enlarged view of FIG. 4B, the corner K of the conductive layer facing the step between the edge of the conductive layer pattern 1a and the insulating base material layer 1b is protruding, and electric field concentration is likely to occur. . A discharge that causes dielectric breakdown is more likely to occur at the edge of the high-potential conductive layer pattern 1a, particularly at the tip of the corner K located at the step with the insulating base layer 1b. As a form of dielectric breakdown, there are a case where dielectric breakdown occurs at once, and a case where dielectric breakdown is completely caused after deterioration of the insulating material while maintaining a small discharge. Since the conductive layer pattern 1a connects the power generating elements in series, when the number of series stages increases, a portion of the conductive layer pattern 1a having a very high potential is generated. In the portion near the final stage of the series stage, there are places where the voltage reaches several hundred volts to several thousand volts. Since the conductive layer pattern 1a is fixed to the insulating base layer 1b having a thickness of about 10 μm to 30 μm, for example, the distance from the bottom surface 11a of the support is small even though the insulating base layer 1b is interposed therebetween. As a result, a discharge is generated between the edge corner K of the high potential conductive layer pattern and the support 11a, resulting in dielectric breakdown.
The DC breakdown voltage of dry air is 3 MV · m ⁻¹ (3 kV / mm). Assuming that the insulating base layer 1b having a thickness of 20 μm is interposed, the dielectric breakdown voltage of the dry air is converted to about 300 V / 20 μm (15 kV / mm). In a predetermined portion of the conductive layer pattern 1a in which the power generating elements are connected in series, near the final stage of the series connection having a large number of stages as described above, if it is left without taking any measures, the possibility of dielectric breakdown is not low. . It's rather expensive. Even if it does not proceed to dielectric breakdown at once, there are many cases where dielectric breakdown is caused by something after partial discharge continues.
If dielectric breakdown occurs at any one place in the entire conductive layer pattern on which the power generation elements connected in series are placed, the voltage will not rise and will not function as a power generation device.
The support may have any form as long as it has a flat bottom plate for placing the flexible printed wiring board, such as a flat plate, a flat rectangular parallelepiped with an upper surface, etc. Good. The material can be anything. A protective sheet or the like may be interposed between the support and the flexible printed wiring board. In order to ensure heat dissipation, it is preferable to form it with a metal such as aluminum.

In the present embodiment, by disposing the insulating film 3 so as to fill the step between the edge of the conductive layer pattern 1a and the insulating base material layer 1b, gases having low resistance to dielectric breakdown such as air and gas components are excluded. Thus, the dielectric breakdown resistance can be improved. The function of the insulating film 3 is based on (E1) disposing an object having a high dielectric breakdown voltage instead of air.
Although the electric potential is increased in the subsequent stage by the power generation elements connected in series, the insulating film 3 may be arranged in the above-described form only in a region where the electric potential is equal to or higher than a predetermined electric potential, or arranged in the entire region regardless of the electric potential. May be.
Needless to say, when an external surge voltage such as lightning is applied, the insulating film 3 contributes to the prevention of dielectric breakdown as compared with the case of intangible measures.

As described above, the thickness of the insulating base material layer 1b is, for example, in the range of 10 μm to 30 μm. Any material may be used as the material for the insulating base layer as long as it is an insulating resin, but it is preferable to use polyimide resins such as polyimide and polyamideimide, and polyamide resins.
The thickness of the conductive layer pattern 1a is, for example, in the range of 2 μm to 25 μm. The conductive layer pattern 1a is formed by making full use of electroless plating, electrolytic plating, etc., and a chromium film and a copper film are laminated as a seed film by electroless plating or sputtering, and then electrolysis is performed. For example, a copper layer is formed by plating.

The material of the insulating film 3 filling the step between the conductive layer pattern 1a and the insulating base material layer 1b is not particularly limited, and a resin insulating tape or the like can be used. Moreover, you may form an insulating resin layer using the existing method. The resin for the insulating tape or the insulating resin layer may be, for example, a versatile insulating resin. Among the general-purpose resins, for example, most of them have a dielectric breakdown voltage of 10 kV / mm or more, rather than many, and it is preferable to use a resin having such a high dielectric breakdown voltage. These volume resistivities are 10 ¹¹ Ω · cm or more, and those having 10 ¹³ Ω · cm or more may be used according to the type of solar power generation.
In addition, polyimide Kapton (dielectric breakdown voltage 280 kV / mm), polyethylene terephthalate (dielectric breakdown voltage 300 kV / mm), polysulfone (dielectric breakdown voltage 300 kV / mm), polyether (dielectric breakdown voltage 100 kV / mm) is particularly high. ), Ethylene tetrafluoride-hexafluoropropylene copolymer (dielectric breakdown voltage 280 kV / mm), or the like may be used. The dielectric breakdown voltage, volume resistivity, etc. can be measured based on JIS standards.
The thickness of the insulating film 3 may be any thickness depending on the type of commercially available insulating tape. For example, it is good to set it as 10 micrometers or more. More preferably, the thickness is larger than the thickness of the conductive layer pattern 1a, and may be 20 μm or more.

  The flexible printed wiring board 10 in this Embodiment is a form which includes the insulating layer 3 in the said flexible printed wiring board 10. For this reason, the insulating film 3 can be arrange | positioned in the form shown in FIG.3 and FIG.4 during manufacture of the flexible printed wiring board 10. FIG. Thereby, when attaching a flexible printed wiring board to a support body or the storage box 11, or after attaching, it is unnecessary to arrange | position the insulating film 3, and it does not need to make a solar power generation module preparation process complicated.

(Modification)
5A and 5B show a photovoltaic power generation module 50 or a flexible printed wiring board 10 showing a modification of the first embodiment, where FIG. 5A is a plan view and FIG. 5B is a cross-sectional view taken along the line VB-VB. This modification also illustrates the photovoltaic power generation module 50 or the flexible printed wiring board 10 of the present invention. In this modification, the insulating film 3 fills the step between the conductive layer pattern 1a and the insulating base layer 1b and does not cover the center of the width of the conductive layer pattern 1a. Regarding the material and thickness of the insulating film 3, the description in the first embodiment is applied as it is.

<Points of this modification>
Discharge tends to occur concentrated on the edge of the conductive pattern 1a. Therefore, by disposing the insulating film in the form shown in FIGS. 5A and 5B, dielectric breakdown can be prevented at the same level as in FIG. 3 of the first embodiment. As a result, after ensuring the dielectric breakdown resistance, for example, the insulating tape can be changed from a wide width to a narrow width, and for example, the cost of the insulating tape can be reduced.

(Embodiment 2)
FIG. 6 is a diagram showing the photovoltaic power generation module 50 or the flexible printed wiring board 10 according to Embodiment 2 of the present invention. Moreover, Fig.7 (a) is sectional drawing which follows the VIIA-VIIA line | wire in FIG. FIG. 7B is a cross-sectional view corresponding to the conventional one without the dielectric breakdown prevention film.
In the present embodiment, the flexible printed wiring board 10 is covered with the dielectric breakdown prevention film 3 so as to reach the bottom surface 11 b of the support 11 including the entire width of the band-shaped flexible printed wiring board main body. The dielectric breakdown prevention film 3 is formed of a high resistance body or a resistance body. In the present embodiment, since the dielectric breakdown prevention film 3 is a resistor, the same reference numeral 3 is also used for the resistor 3. The volume resistance of the material constituting the resistor 3 is 1 kΩ · cm or more, more preferably 100 kΩ · cm or more. It is assumed that the upper limit of the resistance value should not be a level called an insulator, for example. For example, 100 MΩ · cm (10 ⁸ V · cm) or less is preferable.

<Points of this embodiment>
When the high potential Vo generated in the conductive layer pattern 1a and the ground potential Eo are close as shown in FIG. 7B, a large potential gradient, that is, a large electric field is distributed in the local space. As a result, electric discharge tends to occur and dielectric breakdown tends to occur. On the other hand, when the resistor 3 is covered up to the bottom surface 11b of the support body including the entire width of the conductive layer pattern 1a, as shown in FIG. 7A, the high potential Vo generated in the conductive layer pattern 1a. Gradually decreases to the ground potential Eo along the resistor 3. FIG. 7A shows a situation in which the potential approaches Eo, such as Vo → Vo / 2 → Vo / 4. As a result, in this space, the electric potential has a relatively gentle gradient, the electric field is limited accordingly, and discharge is less likely to occur.
In the present embodiment, the function of the resistor 3 is mainly based on (E2) changing the local steep potential distribution at the edge of the conductive layer pattern to a gentle potential gradient over a wide range. Further, when the resistor is a material having a higher dielectric breakdown voltage than air, secondarily, the effect of (E1) disposing a substance having a higher dielectric breakdown voltage instead of air can be obtained.

  The material of the resistor 3 may be any material as long as the volume resistance is in the above range and the handling is easy. For example, the conductive filler may be uniformly distributed in the resin. As the conductive filler, carbon black, polyaniline, various types of metal-coated particles, metal particles, and the like can be used. A desired volume resistivity can be obtained by adjusting the proportion of the resin. Application of the resin to the flexible printed wiring board body can be easily performed by an existing method. In addition, a tape may be prepared using a material having a desired volume resistivity range with a conductive filler-containing resin, and the tape may be used.

  Although the embodiments and examples of the present invention have been described above, the embodiments and examples of the present invention disclosed above are merely examples, and the scope of the present invention is the implementation of these inventions. It is not limited to the form. The scope of the present invention is indicated by the description of the scope of claims, and further includes meanings equivalent to the description of the scope of claims and all modifications within the scope.

  According to the solar power generation module and the like of the present invention, in solar power generation including concentrating solar power generation, an insulating film is formed so as to fill a step between the conductive layer pattern and the insulating base layer, and the conductive layer pattern By disposing the resistor from the edge of the substrate to the bottom surface of the support, it is possible to prevent dielectric breakdown due to electrostatic voltage.

  DESCRIPTION OF SYMBOLS 1a Conductive layer pattern, 1b Insulating base material layer, 3 Dielectric breakdown prevention film (insulating film, high resistance film), 3h Opening part, 5 Power generation element, 5a, 5b Installation part of power generation element, 6 Diode, 10 Flexible printed wiring board , 11 Support (container box), 11b Bottom surface, 11f Flange, 13 Light collector, 13f Fresnel lens, 14 Connector, 50 Solar power generation module, D Intermittent part of conductive layer, G Power generation part, K Edge of conductive layer Corner, Vo conductive layer potential, Eo ground potential.

Claims (8)

A photovoltaic power generation module including a power generation element,
A support;
On the support, comprising a flexible printed wiring board having an electrode portion for installing the power generation element,
The flexible printed wiring board has an insulating base layer for insulating, and a conductive layer pattern composed of a metal layer fixed to the insulating base layer and connecting the power generating elements in series,
The conductive layer pattern is composed of a belt-like continuous portion and an intermittent portion that is located between the continuous portions and interrupts the continuous portion,
The electrode part is located in a pair with the power generation part in the intermittent part,
Along the edge of the continuous portion of the front Kishirube conductive layer pattern, with covers to fill a level difference between the said edge the insulating base layer, it is continuously arranged over the continuous portion and the discontinuous portion insulating With anti-destructive film,
The solar power generation module according to claim 1, wherein the insulating base material layer is continuously disposed over the conductive layer pattern including the intermittent portion, and is located in a band shape between the conductive layer pattern and the support.   The insulating breakdown prevention film is formed of any one of an insulating material and a resistor, and the insulating base material layer is formed of an insulating resin. The photovoltaic power generation module according to 1.   The insulating breakdown prevention film has a width so as to fill each step up to an edge of the conductive layer pattern, an end of the insulating base material layer, and a surface of the support. Item 3. The solar power generation module according to item 1 or 2.   In the conductive layer pattern, strip-like continuous portions and intermittent portions between the continuous portions are alternately arranged on the insulating base material layer, and the electrode portion of the power generating element is the power generation in the intermittent portion. One of the paired electrodes is conductively connected to the continuous part on one side facing the intermittent part, and the other electrode is electrically connected to the continuous part on the other side facing the intermittent part. It is connected, The solar power generation module of any one of Claims 1-3 characterized by the above-mentioned. The dielectric breakdown prevention film is disposed so as to cover the entire width of the conductive layer pattern except the region of the power generation unit where the power generation element is disposed, and to fill the step at both end edges of the conductive layer pattern. The solar power generation module according to claim 4 , wherein The photovoltaic power generation panel according to any one of claims 1 to 5 , wherein the photovoltaic power generation module is arranged in a planar shape. A flexible printed wiring board included in a photovoltaic module,
An insulating substrate layer;
A conductive layer pattern fixed to the insulating base layer and provided with continuous portions made of a band-shaped metal layer and intermittent portions between the continuous portions; and
A power generation element located in the power generation section in the intermittent section and installed on a pair of electrodes,
The conductive layer pattern includes a dielectric breakdown prevention film that covers the step between the edge of the continuous portion and the insulating base material layer so as to fill the step, and is continuously disposed over the continuous portion and the intermittent portion,
In the power generating element, one of the paired electrodes is conductively connected to a continuous portion on one side facing the intermittent portion, and the other is conductively connected to a continuous portion on the other side facing the intermittent portion. And
The flexible printed wiring board for a photovoltaic power generation module, wherein the insulating base material layer is continuous over the conductive layer pattern including the intermittent portion and is located in a strip shape below the conductive layer pattern. .
The dielectric breakdown prevention film is disposed so as to cover the entire width of the conductive layer pattern except the region of the power generation unit where the power generation element is disposed, and to fill the step at both end edges of the conductive layer pattern. The flexible printed wiring board for a photovoltaic power generation module according to claim 7 , wherein:

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