JP2009267034A - Thin-film solar battery module, production method and installation method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solar battery module in which a peripheral part thereof is sealed with an edge part sealing material such as a butyl resin and which is not influenced by a sealing failure and has reliability. <P>SOLUTION: This thin-film solar battery module is a thin-film solar battery module comprising a thin-film solar battery panel containing a glass substrate, a thin-film solar battery cell, a filler, a back cover and an edge part sealing material in which: the thin-film solar battery cell is provided on the glass substrate; the peripheral part of the glass substrate has a part in which a glass is exposed; the filler is formed covering the part in which a glass is exposed and the thin-film solar battery cell; the back cover is provided in a side more distant from the glass substrate; the edge part sealing material covers an edge part of the filler and an edge part of the back cover; and the edge part sealing material contains a part in which the back cover, the filler and the glass substrate edge part are contacted closely. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention includes a solar battery cell in which a thin film solar battery cell is directly formed on a glass substrate, and particularly relates to a technique for improving the weather resistance of a thin film solar battery module installed outdoors.

  In recent years, thin-film solar cells that require less raw materials in order to achieve both low cost and high efficiency of solar cells have attracted attention and have been vigorously developed. In particular, a thin film solar panel structure that uses a low temperature process on a cheap glass substrate to form a transparent electrode, a high-quality semiconductor layer, a back electrode as a thin film solar cell, and directly uses this glass substrate as a surface structure material. It is being studied as an effective method for cost reduction.

  In general, a thin-film solar battery module using a thin-film solar battery panel of this system is used for the purpose of protecting the thin-film solar battery or electrically insulating the surface on which the thin-film solar battery cell is formed. (Hereinafter referred to as EVA) or the like as a main component and a back cover and sealed structure. This back cover is excellent in moisture resistance, such as a laminate of polyvinyl fluoride (PVF) or PET film on a moisture-proof layer such as silica-deposited PET film or aluminum foil to ensure moisture-proofing inside the solar cell module Sheet is used.

  In the thin film solar cell module, since the thin film solar cell may be affected by moisture, various techniques for improving water resistance have been studied.

  In Patent Document 1, in a solar cell module incorporated in a metal frame such as aluminum, infiltration of rainwater or the like by filling a sealing material such as silicone resin or butyl rubber between the periphery of the sealed glass substrate and the aluminum frame A technique for suppressing the above is used. When assembling such a module, a large force is required for frame fitting, but by applying butyl rubber to the frame and heating the frame before assembling and softening the butyl, the assembly can be performed quickly and easily with light labor. The technique which can be assembled in this is disclosed.

  Further, Patent Document 2 discloses a technique for sealing the peripheral portion of the solar cell module with a metal foil tape with an adhesive such as silicone rubber or butyl rubber in a U-shaped cross section in order to further suppress this water intrusion. Yes.

Furthermore, in Patent Document 3, when the solar cell module is installed outdoors, the solar cell module becomes hot due to sunlight and the butyl rubber flows, and measures against poor appearance and reduced sealing performance due to protruding from the frame, A technique for suppressing flow by using a urethane-based reactive hot melt resin is disclosed.
JP-A-8-148710 JP 2002-141543 A JP-A-8-23116

  However, when the module is assembled after applying a peripheral sealing resin such as butyl rubber to the frame as in Patent Document 1, a joint of butyl rubber can be formed at the corner of the module. Further, even when a peripheral sealing resin is applied to the peripheral edge of the substrate whose back surface has been sealed before the assembly of the frame, if the edges are applied one by one, a sealing resin seam can be formed at the corner of the substrate.

  In addition, even when the technique of Patent Document 2 is used, even when a metal foil tape or the like is further adhered and the peripheral portion is sealed, the corner portion is particularly prone to seams and adhesive wrinkles, and a sealing gap is likely to remain. In some cases, the intended sealing effect may not be obtained, and caution is required.

  In order to suppress the flow and protrusion of the butyl rubber applied to the peripheral edge of the module, it is preferable to use a resin that does not flow, but the reactive hot melt used in Patent Document 3 is a urethane resin and is moisture curable. It has moisture permeability and is not preferred for the purpose of improving water resistance.

  In order to solve the problems of the prior art, we examined the use of butyl resin, which has low moisture permeability, but in the temperature range reached in the actual use state, the resin adhesion is partially lost or fluidized. A problem that protruded occurred.

  As described above, the solar cell module whose peripheral portion is sealed with butyl resin or the like may not sufficiently obtain a sealing effect when a gap is formed at the sealing resin joint, and corrosion may occur early depending on the use environment. It may occur, and it was a problem.

  The objective of this invention is providing the reliable thin film solar cell module without the sealing defect of such a module peripheral part.

In order to solve the above problems, the present invention provides:
A thin-film solar battery module including a thin-film solar battery panel including at least a glass substrate having a thin-film solar battery cell on one main surface, a filler, a back cover, and an end sealing material, wherein the thin-film The peripheral part on the said 1 main surface of a glass substrate provided with a photovoltaic cell on 1 main surface has a part where glass is exposed, and the filler is the part where the said glass is exposed, a thin film solar cell, A back cover is further provided on the side of the filler far from the glass substrate, and the end sealing material is formed so as to cover the end of the filler and the end of the back cover. The end sealing material includes a portion that is in close contact with a back cover, a filler, and an end of the glass substrate, and the portion is the entire peripheral portion of the thin-film solar cell panel, or Of the thin film solar panel Is any portion excluding the one place even without a thin-film solar cell module.

  In the present invention, the width at which the end sealing material is in close contact with the back cover is 1 mm or more and 10 mm or less, and the width at which the end sealing material is in close contact with the end of the glass substrate is 1 mm. The thin film solar cell module is characterized by the above.

  The present invention is also the thin-film solar cell module, wherein the end sealing material is one or more materials selected from the group consisting of butyl rubber, silicone resin, and acrylic pressure-sensitive adhesive.

  The present invention is also characterized in that the end sealing material has a softening point of 100 ° C. or higher and 230 ° C. or lower, and the hardness of the end sealing material according to a type A durometer is 20 to 100. A solar cell module.

  The present invention further includes a frame and a gasket that covers the edge of the substrate and contacts the groove of the frame, and the end sealant does not contact the groove and gasket of the frame. Module.

  The present invention further includes a frame and a gasket that covers the edge of the substrate and contacts the groove of the frame, and the end sealing material and the gasket move integrally within the frame groove. A thin film solar cell module.

  The present invention is also a thin-film solar cell module, further comprising a mark that clearly indicates the upper part of the water when installed.

The present invention also includes a thin-film solar battery module including a thin-film solar battery panel including at least a glass substrate provided with a thin-film solar battery cell on one main surface, a filler, a back cover, and an end sealant. And the peripheral part on the said 1 main surface of the glass substrate provided with the said thin film photovoltaic cell on 1 main surface has a part where glass is exposed, and the filler is a part where the said glass is exposed And the thin-film solar cell, and further includes a back cover on the side far from the glass substrate of the filler, and the end sealing material includes an end of the filler and an end of the back cover. The end sealing material includes a portion that is in close contact with the back cover, the filler, and the glass substrate end, and the portion includes all the peripheral portions of the thin-film solar cell panel. Part or said thin film solar cell Is any part excluding at least one location of the periphery of the panel, a method of manufacturing the thin film solar cell modules,
Forming a thin-film solar cell on one main surface of the glass substrate and forming a glass substrate with the thin-film solar cell;
Removing the thin-film solar cells at the peripheral edge on the one main surface of the glass substrate with the thin-film solar cells;
A step of forming a portion where the glass is exposed at a peripheral edge portion on the one main surface of the glass substrate provided with the thin film solar cell on one main surface;
The raw material sheet of the filler is disposed so as to cover the portion where the glass is exposed and the thin film solar cell, and further, the raw material sheet of the filler is melted and degassed with the back cover sheet disposed. Comprising a sealing step for sealing the solar cells,
A step of scraping off the filler and the back cover protruding from one main surface of the glass substrate after the sealing step;
A step of covering an end portion of the filler and an end portion of the back cover with an end sealant,
It is a manufacturing method of a thin film solar cell module.

  According to the present invention, the step of covering the end portion of the filler and the end portion of the back cover with the end sealant simultaneously covers the back cover, the filler, and the glass substrate end portion with the end sealant. Covered with a nozzle in an L-shape, and covers all portions except for at least one of the peripheral portions of the thin-film solar cell panel with the end sealant continuously from the nozzle with a single stroke. A method for manufacturing a thin-film solar cell module.

  According to the present invention, the step of covering the end portion of the filler and the end portion of the back cover with the end sealant simultaneously covers the back cover, the filler, and the glass substrate end portion with the end sealant. Covering in an L-shape, the back cover, the filler, the glass substrate end, and the end sealing material are in close contact with each other at the periphery of the thin-film solar cell panel. A method for manufacturing a thin-film solar cell module.

The present invention also includes a thin-film solar battery module including a thin-film solar battery panel including at least a glass substrate provided with a thin-film solar battery cell on one main surface, a filler, a back cover, and an end sealant. And the peripheral part on the said 1 main surface of the glass substrate provided with the said thin film photovoltaic cell on 1 main surface has a part where glass is exposed, and the filler is a part where the said glass is exposed And the thin-film solar cell, and further includes a back cover on the side far from the glass substrate of the filler, and the end sealing material includes an end of the filler and an end of the back cover. The end sealing material includes a portion in close contact with the back cover, the filler, and the glass substrate end, and the portion is at least one of the peripheral edge of the thin film solar cell panel. In all parts except , A method of installing the thin-film solar cell module,
The portion where the end sealant is not in intimate contact with the back cover, the filler, and the glass substrate end is disposed so as to be the upper part of the water when the thin-film solar cell module is installed, and is installed. The installation method of the thin film solar cell module.

  According to the present invention, the waterproof / moisture-proof function is not impaired over a long period of time at the periphery of the solar cell module that is often exposed to moisture in the actual usage environment of the solar cell, and there is no problem such as corrosion and high reliability. A thin film solar cell module can be obtained.

  Embodiments of the present invention will be described with reference to the drawings. However, the types, shapes, relative arrangements, and the like of the component parts described in the present embodiment are not limited to the scope of the present invention, and can be appropriately changed based on the idea of the present invention.

  FIG. 1 is a schematic diagram of a thin film solar cell module according to a first embodiment of the present invention. A thin film solar cell 2 is formed directly on the glass substrate 1. The thin film of the area | region 13 around the thin film photovoltaic cell on a glass substrate is removed. Further, the thin-film solar battery cell 2 is sealed by the filler 3 and the back cover 4 to constitute a thin-film solar battery panel 11. An end sealing material 6 is adhered and applied to the peripheral edge of the thin film solar cell panel, and is incorporated into a frame 7 such as aluminum via a gasket 5.

  As the glass substrate 1, it is preferable to use the thing of the magnitude | size of a solar cell module.

  As the glass material, blue plate glass or white plate glass having improved light transmittance particularly in the infrared region except iron is used, but is not limited thereto. Although expensive in terms of price, borosilicate glass and quartz glass that do not contain impurities that adversely affect semiconductors are preferred for obtaining reliability. The present invention is also effective when these substrates (glass substrates) are used. It is.

  The glass of these materials may be tempered glass or normal glass. In order to maintain the strength of the solar cell module, for example, a solar cell having a size of 1 m square uses a tempered glass having a thickness of about 3 mm and a normal glass having a thickness of about 5 mm.

After forming silicon oxide to a thickness of about 100 nm on the surface of these glasses for the purpose of preventing the diffusion of impurities to the semiconductor, a transparent conductive film such as SnO ₂ or ZnO is formed. The thickness of the transparent conductive film is between 100 nm and 1000 nm, and the thickness is appropriately designed in consideration of the degree of unevenness applying conductivity and crystallinity of the material, and further the light transmittance of the transparent conductive film. As a suitable example, the surface conductivity of the glass on which the transparent conductive film is formed is 10Ω / □ or less, the transmittance is 80% or more, and the haze ratio of the unevenness is 10% or more.

  The glass substrate 1 is cut into a predetermined dimension before or after the formation of the transparent conductive film. If the cut surface of the glass substrate is left as it is, it is easy to break due to thermal stress due to the difference in expansion caused by external stress or temperature distribution on the substrate. Perform chamfering to round. As the chamfered shape, there are R chamfering that rounds, C chamfering that rounds and polishes the cut surface, and thread chamfering that rounds only the corner, but R chamfering is most preferable when the temperature is raised in a later process. The option tends to increase the probability that the glass will break as fewer parts are polished. In addition, the strength of the glass is improved by chamfering, but it is far from the cut surface and does not recover up to the in-plane strength. is there.

  A glass substrate with a transparent electrode is patterned into an element shape by laser processing. A semiconductor is formed on the processed substrate. As semiconductors for thin film solar cells, amorphous silicon, thin film polycrystalline silicon, germanium compounds, and the like are well known. In addition, compound semiconductors such as CdS / CdTe, CIS, and CIGS are known as examples to which the present invention is applied, but are not limited thereto. Moreover, the photovoltaic cell is not limited to a single layer, but may be a laminate of a plurality of photovoltaic cells. A preferable example is an amorphous / thin film polycrystalline silicon tandem cell in which a pin junction of amorphous silicon and a pin junction of thin film polycrystalline silicon are stacked from the light incident side.

  After patterning the semiconductor layer by laser processing or the like, a back electrode is formed. For the back electrode, a reflective layer such as several tens of nanometers of ZnO and a reflective metal of about 10 nm are laminated, and a semiconductor / back electrode interface having a high reflectivity is used. Similarly, the back electrode is patterned by laser processing to form a thin film solar cell on a glass substrate.

  Usually, in a large-area solar cell, about 100 cells are connected in series, and the voltage is about 80V to 150V.

  Since these thin films are formed by chemical vapor deposition, they are formed on almost the entire surface including the peripheral portion of the glass substrate. The voltage of the electric power generated in the solar cell module may reach around 100V with one solar cell module. Since there is a risk of electric leakage, by providing a region 13 in which the transparent electrode, the semiconductor, and the back electrode are removed from the edge portion of the glass substrate with a predetermined width, the glass substrate 1 is provided on the inner side. The generated electric power is insulated from the peripheral edge of the glass substrate.

  The width required for insulation is defined by the industry standard UL 1703 or IEC 61730, etc. When a module is used in series at a system voltage of 600 V at the maximum, a width of at least 6.4 mm is required.

  The removal method includes buffing using a rotating buff to which an abrasive is attached, sand blasting by blowing hard particles, laser processing, and the like, and methods that do not cause scratches or irregularities as much as possible have been studied.

  Further, such a polished surface is useful for satisfactorily adhering the filler in a later sealing step.

  Thin-film solar cells formed on the glass substrate are wired with copper strips (leads), and are sealed and protected with the filler 3 and the back cover 4.

  As the filler, EVA (ethylene-vinyl acetate copolymer) is most often used and has become an industry standard. As the back cover, a fluorine resin film such as a polyvinyl fluoride film (for example, Tedlar film (registered trademark)) or an insulating film having excellent moisture resistance and water resistance such as a PET film is used. The cover 4 preferably has a structure in which a moisture-proof layer made of a metal foil made of aluminum or the like and a film coated with an inorganic moisture-proof film is sandwiched and laminated between these fluororesin films or PET films. Since a metal foil such as an aluminum foil has a function of improving moisture resistance and water resistance, the back cover 4 having such a structure can effectively protect the thin-film solar battery cell 2 from moisture. .

  After stacking the raw material sheet of the filler, which is the same size or slightly larger than the glass substrate, and the sheet of the back cover on the surface of the glass substrate on which the solar cells are formed, pass the lead for wiring through the hole, and then apply it to the vacuum laminator. Then, after the filler is melted and degassed, the sealing step is performed by pressing the sheet at atmospheric pressure and thermally cross-linking.

  After the sealing step, a resin such as EVA protrudes and adheres to the end surface of the glass substrate, and the filler and the back cover may protrude from the end of the glass substrate.

  The protruding filler and back cover are scraped off to fit the size of the glass substrate using a blade or the like.

  The protruding resin may be insufficiently adhered to the glass substrate or may be weak, so that it may be peeled off in a later step. In particular, when a resin or the like is applied in a later process, application failure may occur, or a defective portion through which moisture passes in a finished product may be generated.

  It is desirable that the filler remaining on the edge of the glass substrate is completely removed so that the resin filler is not peeled off or lost in a later process due to the filler on the edge of the glass substrate. Actually, the allowable limit is when the remaining filler locally exists with a thickness of 0.1 mm or less. Above that, it was observed that this part became a passage for moisture, especially in accelerated tests assuming long-term use.

  Next, a description will be given with reference to FIG. In addition, since the filler 3 and the back cover 4 are removed at the chamfered portion of the glass in the process of scraping, the end portion of the filler 3 and the back cover 4 is smaller than the size of the glass substrate 1 and is kept inward from the end of the glass substrate. Become. The specific dimensions will be around 0 to 1 mm.

  When a panel from which the protruding filler and back cover have been scraped is viewed from the glass end, the filler 3 layer and the back cover 4 layer appear to be laminated on the element surface of the glass substrate.

  Since the filler 3 has a property of permeating moisture and the interface between the filler 3 and the glass substrate 1 is opened at this end, moisture enters from this portion in the use environment of the solar cell. there is a possibility.

  In order to solve this problem, the end sealing material 6 is applied so as to cover and closely adhere to the exposed portion.

  Since there is a possibility that moisture from the end portion of the end sealing material 6 may enter only by covering the cross section of the filler, the end sealing material 6 covers the periphery of the back cover 4 and on the opposite side. It is necessary to cover the chamfered portion of the glass substrate with a predetermined width.

  Although it is desirable that the width of the end cover 6 to cover the back cover 4 is as wide as possible, in order to provide the end seal 6 in a process of applying the liquid while the end seal 6 is liquidized and discharged from the nozzle. Considering the ease of implementation, it is not preferable to widen the width extremely.

  Considering the dimensional accuracy of the glass substrate 1 and the shaved back cover 4 as shown in FIG. 2, the width 14 covering the back cover 4 is preferably 1 mm or more in design dimensions and 0.5 mm or more and 10 mm or less in actual dimensions.

  In the application of the end sealant 6 to the end of the glass substrate 1, the maximum is the thickness of the glass substrate 1, but the minimum is a width 15 of about 1 mm in addition to the width of the filler residue. is necessary.

  Since the glass edge is roughened by chamfering, the adhesion of the edge sealing material 6 may be weakened, and the minimum width is determined by checking the accelerated reliability test according to the surface condition. Go.

  As a material for the end sealing material 6, it is desirable that moisture permeation is less than that of the filler, and it is desirable to use a material that can be installed with a thickness capable of suppressing moisture permeation in a completed state.

  And the end part sealing material 6 needs to be able to be installed in close contact with the part to be sealed.

  However, in order to specifically realize the actual installation process, the process of applying the material in a liquid state is simple.

  As a method for applying the end sealing material 6, a nozzle having a shape corresponding to the installation portion is connected to the end of the module while controlling the resin in a predetermined viscosity state by a method such as heating to a discharge amount that follows the application speed. A dispensing method is preferable in which it is applied along the part.

  In the process of applying a material having such a certain degree of viscosity, the most problematic issue in applying is not the part where it is continuously applied. It is a discontinuous point that starts and completes coating, or a corner that changes the coating direction.

  In this portion, the sealing agent is applied on the end sealing material 6 applied before, and a gap is formed between the end sealing material 6 and the surface to be applied.

  Due to this gap, a gap is formed between the exposed portions of the filler of the end sealing material 6, and moisture easily enters.

  Then, whatever means is used, as shown in FIG. 4, the end point of application overlaps with the end sealing material 6 at the start point of application, and voids are likely to occur in this part.

  In the use of the solar cell module, the portion where moisture easily accumulates at the edge of the substrate is the lower side when the solar cell module is installed, and the left and right and upper sides have the least moisture.

  The start and end points of application are the upper side when the module is actually installed outdoors. Further, it is preferable that the upper side portion is also a side portion rather than a corner portion. This is because even when the module gets wet with rain or the like, the upper side has the least time to be exposed to water, and the influence of water intrusion from the seam is small.

  In addition, the upper side part of the thin film solar cell module 12 is distinguished by the attachment method of a terminal box, and the attachment method of a performance label. For example, there is a method of distinguishing by a label such as “Caution for mounting direction” ↑↑ ”INSTALL THIS SIDE UP”.

  Furthermore, it is important that the end face sealant is applied in close contact with the end portion of the glass substrate 1, particularly the exposed portion of the filler, except for the start and end points of application.

  For that purpose, it is implement | achieved by apply | coating with one stroke over the perimeter without separating a resin, without separating a nozzle from the edge part of the glass substrate 1 also in a corner | angular part.

  In the above process, the end of the thin-film solar cell panel in which the end sealing material 6 is installed at the end of the glass substrate 1 is attached to the frame by a groove provided in the frame.

  The thin-film solar cell panel is not directly attached to the frame, but is attached to the groove of the frame with a resin gasket 5 covering the end.

  The frame 7 is usually made of aluminum or an alloy thereof. When the frame 7 and the glass of the solar cell panel 11 are in direct contact with each other, they are heated by absorbing sunlight in an actual use environment. The temperature difference between the glass substrate and the frame becomes a thermal gradient in the glass substrate, and a difference in the amount of expansion of the glass is caused in part.

  The gasket 5 has a function of relieving the problem of thermal cracking by heat insulation, relaxing external stress to the glass substrate 1, and relaxing stress localization between the groove of the frame 7 and the glass substrate.

  Moreover, as a structure which supports the solar cell panel 11 with the groove | channel and the gasket 5 of the flame | frame 7, there are a case where it supports by avoiding the edge part of a glass substrate, and a U-shaped whole.

It is desirable that the end sealing material 6 is not subjected to mechanical stress. In particular, when stress acts in the direction of peeling off the end sealing material 6 from the end of the glass substrate, the end sealing material 6 may be peeled off from the sealing surface. In order to prevent the influence, a method for supporting the gasket and the frame is devised so that the end sealing material 6 does not come into contact with other members (specifically, the structure of FIG. 1 can be considered).
Alternatively, as shown in FIG. 3, it is preferable to move the gasket freely within the groove of the aluminum frame, particularly at the end of the glass substrate.

  As a method of realizing free movement, it is conceivable to provide play in the dimensions of the gasket or to make the material of the gasket 5 touching the edge of the glass substrate flexible.

  Examples of the material of the gasket 5 include EPDM and thermoplastic elastomer (commercial example: Santoprene).

  It is desirable that the end sealant 6 does not flow at a temperature that is reached when the solar cell module is used, and it is desirable to use a device to form a viscous liquid when it is applied for installation. . Further, it is desirable that the hardness is such that no great deformation occurs with respect to the stress generated inside the groove of the frame and no cracking occurs.

  Examples of the material include at least one member of the group of butyl rubber, silicone resin and acrylic adhesive.

  In terms of water vapor permeability, butyl rubber and acrylic pressure-sensitive adhesives are desirable because they have a small amount of permeation, and silicone resin and then butyl rubber are excellent in adhesion. However, silicone is inferior in water vapor permeability, and butyl rubber is superior from all these viewpoints. Although the property of butyl rubber can be adjusted by blending or the like, it is desirable that it does not melt at the use temperature and has tackiness at room temperature but does not easily deform.

  Specifically, it is desirable to use a butyl rubber having a softening point of 100 ° C. or higher and 230 ° C. or lower and a hardness of 20 to 100 as measured with a type A dilometer.

  Further, it is desirable that the thickness to be applied is 0.3 mm or more so that no hole or the like is generated during the application. If the coating thickness is smaller, there is a possibility that the resin breaks and a hole is formed when a coating failure occurs due to irregularities in the end portion of the back cover or the filler or defective dimensions of the glass.

  Also, after applying a waterproof resin to each side, the resin joints at each corner are heated with hot air or a heated iron, etc., and the waterproof resin, transparent insulating substrate (glass substrate) and protective sheet (back cover) The gap between the joints can be eliminated by melting the resin up to the interface and re-molding.

  Even when waterproof resin is applied without any breaks as described above, one seam can be created at the start and end points, but if this melting technique is applied here, the seam can be completely eliminated around the entire circumference. Further preferred.

  Hereinafter, specific examples will be described.

Example 1
A substrate in which thin film solar cells are formed on a 4 mm thick glass substrate and the peripheral film is removed is stacked with an EVA sheet as a filler, a PET / aluminum foil / Tedlar film three-layer laminated sheet as a back cover, and a vacuum laminator The thin film solar cell panel was obtained by sealing and heating curing at 150 ° C./30 minutes.

  The filler and the back cover that protruded around the glass substrate were removed with a blade, and butyl resin was applied to the periphery of the filler. The overlapping part with the back cover was 1 mm, and the overlapping part with the glass substrate end part was 1 mm.

  The butyl resin was applied on each side of the solar cell panel. Thereafter, the resin at the corners of the four corners was melted with a trowel heated to the bonding interface to eliminate the gaps, and then re-molded.

  After attaching a gasket to this, an aluminum frame was assembled to produce a solar cell module.

  The produced module was immersed in warm water at 50 ° C. for 20 days, and before and after that, the adhesion of butyl resin was examined by insulation resistance.

  The insulation resistance was measured by the following procedure. Part of the Tedlar film on the back sheet is removed at a portion that does not hinder hot water immersion or the like, and the internal aluminum foil is exposed. Immerse the bottom side of the module in about 5 cm of water, and measure the insulation resistance between the water and the exposed aluminum foil on the back of the module with an insulation resistance meter (applied voltage = DC250V, measurement range = 0.1 to 200 MΩ). It was measured. When moisture penetrates into the butyl adhesion surface by immersion in warm water, the insulation resistance decreases. The exposed aluminum part was protected by attaching an insulating sheet when immersed in warm water.

(Example 2)
Although it is the same as that of Example 1, application | coating is started in the center part of a short side, and it rotates without releasing a nozzle in a corner | angular part, as shown in FIG. It differs from Example 1 by the point which apply | coated continuously to the starting point.

(Comparative Example 1)
After sealing and heat curing in the same manner as in Example 1 to remove the protruding portion of the end, hot melt butyl was applied while joining each side with a corner. A solar cell module was fabricated by assembling the frame as it was without melting the corners, and evaluated in the same manner as in Example 1.

  The results are summarized in Table 1. When the gap of the seam remained in the corner (comparative example), it decreased to 0.4 MΩ after 20 days, and the effect of sealing the peripheral edge was impaired. On the other hand, the melt resistance (Example 1) and the application without application of all-round seams (Example 2) so as to eliminate the gaps between the corner joints, the insulation resistance is 140 MΩ or more even after 20 days of warm water immersion, and the peripheral edge sealing effect Was able to be maintained.

  Thus, by eliminating the gap between the resin applied to the peripheral portion, the reliability and durability of the peripheral portion sealing increased, and a module with high long-term reliability could be obtained.

Sectional drawing which shows the structure of the thin film solar cell module which is an example of 1st embodiment concerning this invention. Sectional drawing which shows the edge part sealing structure in the edge part of the solar cell panel of the thin film solar cell module which is an example of 1st embodiment concerning this invention. Sectional drawing which shows the structure of the thin film solar cell module which is an example of 2nd embodiment concerning this invention. The figure which looked at the structure which apply | coats edge part sealing material to the edge part of the periphery of the thin film solar cell panel of the thin film solar cell module concerning this invention from the surface of the back cover, and the detail which shows the part of the starting point of an application | coating, and an end point .

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Glass substrate 2 Thin film photovoltaic cell 3 Filler 4 Back cover 5 Gasket 6 End sealing material 7 Frame 17 End sealing material seam 18 End sealing material seam gap

Claims (11)

  A thin-film solar battery module including a thin-film solar battery panel including at least a glass substrate having a thin-film solar battery cell on one main surface, a filler, a back cover, and an end sealing material, wherein the thin-film The peripheral part on the said 1 main surface of a glass substrate provided with a photovoltaic cell on 1 main surface has a part where glass is exposed, and the filler is the part where the said glass is exposed, a thin film solar cell, A back cover is further provided on the side of the filler far from the glass substrate, and the end sealing material is formed so as to cover the end of the filler and the end of the back cover. The end sealing material includes a portion that is in close contact with a back cover, a filler, and an end of the glass substrate, and the portion is the entire peripheral portion of the thin-film solar cell panel, or Of the thin film solar panel Without even a all parts except the one place, the thin-film solar cell module.   The width at which the end sealing material is in close contact with the back cover is 1 mm or more and 10 mm or less, and the width at which the end sealing material is in close contact with the end of the glass substrate is 1 mm or more. The thin film solar cell module according to claim 1.   The thin-film solar cell module according to claim 1 or 2, wherein the end sealing material is one or more materials selected from the group consisting of butyl rubber, silicone resin, and acrylic pressure-sensitive adhesive.   3. The softening point of the end sealing material is 100 ° C. or higher and 230 ° C. or lower, and the hardness of the end sealing material according to a type A durometer is 20 to 100. 4. Thin film solar cell module.   5. The frame according to claim 1, further comprising a frame and a gasket that covers the edge of the substrate and abuts against a groove of the frame, wherein the end sealing material does not contact the groove and gasket of the frame. The thin film solar cell module according to 1. 5. The frame according to claim 1, further comprising a frame and a gasket that covers an end portion of the substrate and abuts against a groove of the frame, wherein the end portion sealing material and the gasket are integrally movable within the frame groove. The thin film solar cell module of any one of these.   It is a thin film solar cell module of any one of Claims 1-6, Comprising: The thin film solar cell module further provided with the label | marker which specifies the water upper part at the time of installation. A thin-film solar battery module including a thin-film solar battery panel including at least a glass substrate having a thin-film solar battery cell on one main surface, a filler, a back cover, and an end sealing material, wherein the thin-film The peripheral part on the said 1 main surface of a glass substrate provided with a photovoltaic cell on 1 main surface has a part where glass is exposed, and the filler is the part where the said glass is exposed, a thin film solar cell, A back cover is further provided on the side of the filler far from the glass substrate, and the end sealing material is formed so as to cover the end of the filler and the end of the back cover. The end sealing material includes a portion that is in close contact with a back cover, a filler, and an end of the glass substrate, and the portion is the entire peripheral portion of the thin-film solar cell panel, or Of the thin film solar panel Even without a all parts except the one place, a manufacturing method of the thin-film solar cell module,
Forming a thin-film solar cell on one main surface of the glass substrate and forming a glass substrate with the thin-film solar cell;
Removing the thin-film solar cells at the peripheral edge on the one main surface of the glass substrate with the thin-film solar cells;
A step of forming a portion where the glass is exposed at a peripheral edge portion on the one main surface of the glass substrate provided with the thin film solar cell on one main surface;
The raw material sheet of the filler is disposed so as to cover the portion where the glass is exposed and the thin film solar cell, and further, the raw material sheet of the filler is melted and degassed with the back cover sheet disposed. Comprising a sealing step for sealing the solar cells,
A step of scraping off the filler and the back cover protruding from one main surface of the glass substrate after the sealing step;
A step of covering an end portion of the filler and an end portion of the back cover with an end sealant,
Manufacturing method of thin film solar cell module.   The step of covering the end portion of the filler and the end portion of the back cover with the end portion sealing material includes the step of covering the back cover, the filler material, and the glass substrate end portion simultaneously with the end portion sealing material into an L-shaped nozzle. And covering all the portions except at least one of the peripheral portions of the thin-film solar cell panel with the end sealing material continuously from the nozzle with a single stroke. Method for producing a thin-film solar cell module.   The step of covering the end portion of the filler and the end portion of the back cover with the end portion sealing material covers the back cover, the filler material, and the glass substrate end portion simultaneously with the end portion sealing material in an L shape. 9. The back cover, the filler, the glass substrate end, and the end sealing material are brought into close contact with each other at all the peripheral portions of the thin-film solar cell panel. The manufacturing method of the thin film solar cell module of description. A thin-film solar battery module including a thin-film solar battery panel including at least a glass substrate including a thin-film solar battery cell on one main surface, a filler, a back cover, and an end sealing material, wherein the thin film The peripheral part on the said 1 main surface of a glass substrate provided with a photovoltaic cell on 1 main surface has a part where glass is exposed, and the filler is the part where the said glass is exposed, a thin film solar cell, A back cover is further provided on the side of the filler far from the glass substrate, and the end sealing material is formed so as to cover the end of the filler and the end of the back cover. The end sealing material includes a portion that is in close contact with a back cover, a filler, and an end of the glass substrate, and the portion includes all of the thin-film solar cell panel except for at least one peripheral portion. Thin film solar cell that is part A method of installing the module,
The portion where the end sealant is not in intimate contact with the back cover, the filler, and the glass substrate end is disposed so as to be the upper part of the water when the thin-film solar cell module is installed, and is installed. The installation method of the thin film solar cell module.