JP2012253164A - Rear surface protection sheet for solar cells and solar cell module including the same - Google Patents

Rear surface protection sheet for solar cells and solar cell module including the same Download PDF

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JP2012253164A
JP2012253164A JP2011123882A JP2011123882A JP2012253164A JP 2012253164 A JP2012253164 A JP 2012253164A JP 2011123882 A JP2011123882 A JP 2011123882A JP 2011123882 A JP2011123882 A JP 2011123882A JP 2012253164 A JP2012253164 A JP 2012253164A
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resin layer
solar cell
back surface
protection sheet
surface protection
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Takanobu Terasawa
孝展 寺澤
Daisuke Maeda
大輔 前田
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Toyo Aluminum KK
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Toyo Aluminum KK
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Priority to JP2011123882A priority Critical patent/JP2012253164A/en
Priority to PCT/JP2012/062740 priority patent/WO2012165170A1/en
Priority to TW101119735A priority patent/TWI535045B/en
Publication of JP2012253164A publication Critical patent/JP2012253164A/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B32B27/322—Layered products comprising a layer of synthetic resin comprising polyolefins comprising halogenated polyolefins, e.g. PTFE
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/049—Protective back sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2264/00—Composition or properties of particles which form a particulate layer or are present as additives
    • B32B2264/10—Inorganic particles
    • B32B2264/102—Oxide or hydroxide
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/306—Resistant to heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/712—Weather resistant
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy

Abstract

PROBLEM TO BE SOLVED: To provide a rear surface protection sheet for solar cells which improves adhesion with an EVA resin serving as a filler used for sealing solar cell elements and maintains weather resistance for a long period, and to provide a solar cell module including the rear surface protection sheet for solar cells.SOLUTION: A rear surface protection sheet 10 for solar cells, which is disposed on a rear surface side of a solar cell module, includes: a first resin layer 11, a second resin layer 12, and a third resin layer 13 that are laminated in this order, and the second resin layer 12 includes a non stretched polypropylene. The solar cell module includes: a filler disposed for sealing solar cell elements and the rear surface protection sheet 10 for the solar cells having the above described characteristics and fastened so that the first resin layer 11 is disposed on an outer surface of the filler on the rear surface side of the solar cell module.

Description

本発明は、太陽電池モジュールの裏面側に配置される太陽電池用裏面保護シートとそれを備えた太陽電池モジュールに関し、特定的には、長期耐候性を有する太陽電池用裏面保護シートとそれを備えた太陽電池モジュールに関する。   TECHNICAL FIELD The present invention relates to a solar cell back surface protective sheet disposed on the back surface side of a solar cell module and a solar cell module including the solar cell module, and specifically, a solar cell back surface protective sheet having long-term weather resistance and the solar cell module. The present invention relates to a solar cell module.

太陽電池モジュールは、屋外に配置されるので、太陽電池素子、電極、および配線等を保護する目的で、表面側には透明ガラス板が配置され、裏面側には太陽電池用裏面保護シートとして樹脂フィルムの積層シートが配置される。太陽電池素子は、エチレン-酢酸ビニル共重合体（ＥＶＡ）樹脂等の充填材により封止され、上記の表面側の透明ガラス板と裏面側の積層シートとによって挟み込まれるように配置される。太陽電池用裏面保護シートは、ＥＶＡ樹脂の外表面に加熱プレスによって接着される。   Since the solar cell module is disposed outdoors, a transparent glass plate is disposed on the front surface side and the back surface side is a resin as a solar cell back surface protection sheet for the purpose of protecting the solar cell elements, electrodes, wiring, and the like. A laminated sheet of film is placed. The solar cell element is sealed with a filler such as ethylene-vinyl acetate copolymer (EVA) resin, and is disposed so as to be sandwiched between the transparent glass plate on the front surface side and the laminated sheet on the back surface side. The back surface protection sheet for solar cells is bonded to the outer surface of the EVA resin by a hot press.

一般に、太陽電池用裏面保護シートは、ＥＶＡと接着される側の面に接着性の樹脂フィルム（接着性層）を備え、外気に露出する側の面に耐候性フィルム（耐候性層）を備えている。さらに、外気からの蒸気、水分等が太陽電池素子に到達することを防ぐために、接着性層と耐候性層との間には、耐透湿性フィルム（耐透湿性層）が配置されている。たとえば、特開２００６-１７９５５７号公報（以下、特許文献１という）には、耐透湿性層としてポリエチレンテレフタレート（ＰＥＴ）フィルムを備える太陽電池用裏面保護シートが提案されている。   Generally, the back surface protection sheet for solar cells is provided with an adhesive resin film (adhesive layer) on the side to be bonded to EVA and a weather resistant film (weather resistant layer) on the side exposed to the outside air. ing. Furthermore, in order to prevent vapor, moisture, etc. from the outside air from reaching the solar cell element, a moisture-permeable film (moisture-resistant layer) is disposed between the adhesive layer and the weather-resistant layer. For example, Japanese Laid-Open Patent Publication No. 2006-179557 (hereinafter referred to as Patent Document 1) proposes a back protective sheet for solar cells that includes a polyethylene terephthalate (PET) film as a moisture-permeable layer.

特開２００６-１７９５５７号公報JP 2006-179557 A

特許文献１に記載の太陽電池用裏面保護シートは、耐透湿性層としてのＰＥＴが外気での使用中に紫外線、大気中の水分によって加水分解を起こし、長期間の使用において接着性層、耐候性層との接着性が低下する問題があった。   The back surface protection sheet for solar cells described in Patent Document 1 is such that PET as a moisture permeable layer is hydrolyzed by ultraviolet light and moisture in the atmosphere during use in the open air, and the adhesive layer and weather resistance are used over a long period of use. There was a problem that the adhesiveness with the adhesive layer was lowered.

本発明の目的は、上述した問題に鑑みてなされたものであり、太陽電池用裏面保護シートを構成する層間の長期的な接着性を向上させることが可能な太陽電池用裏面保護シートとそれを備えた太陽電池モジュールを提供することである。   The object of the present invention has been made in view of the above-described problems, and a solar cell back surface protective sheet capable of improving long-term adhesion between layers constituting the solar cell back surface protective sheet and the same. It is providing the solar cell module provided.

本発明に従った太陽電池用裏面保護シートは、太陽電池モジュールの裏面側に配置される太陽電池用裏面保護シートであって、順に積層された第１の樹脂層、第２の樹脂層、および、第３の樹脂層を備え、第２の樹脂層が無延伸ポリプロピレンを含む。   The back surface protection sheet for solar cells according to this invention is a back surface protection sheet for solar cells arrange | positioned at the back surface side of a solar cell module, Comprising: The 1st resin layer laminated | stacked in order, 2nd resin layer, and The third resin layer is provided, and the second resin layer contains unstretched polypropylene.

本発明の太陽電池用裏面保護シートにおいては、加水分解を生じない無延伸ポリプロピレンを第２の樹脂層に用いることによって、第１の樹脂層と第２の樹脂層との間、および、第２の樹脂層と第３の樹脂層との間で、高い接着性を長期的に維持することができる。   In the back surface protection sheet for solar cells of the present invention, by using unstretched polypropylene that does not cause hydrolysis in the second resin layer, between the first resin layer and the second resin layer, and second High adhesiveness can be maintained for a long time between the resin layer and the third resin layer.

本発明の太陽電池用裏面保護シートにおいて、第２の樹脂層が、白色を呈する無延伸ポリプロピレンフィルム、または、無色透明を呈する無延伸ポリプロピレンフィルムからなる第１のフィルムと、第１のフィルムの両面に積層された、無色透明を呈する無延伸ポリプロピレンフィルムからなる第２のフィルムとを含むことが好ましい。   In the back surface protection sheet for a solar cell of the present invention, the second resin layer is a first film made of an unstretched polypropylene film exhibiting white color or an unstretched polypropylene film exhibiting colorless transparency, and both surfaces of the first film. And a second film made of an unstretched polypropylene film exhibiting colorless and transparent.

このように第２の樹脂層を構成することにより、無延伸ポリプロピレンフィルムの製造時に生じる表面の荒れ等が目立たないように、第２の樹脂層を第１の樹脂層と第３の樹脂層の間に介在させて積層することができる。   By configuring the second resin layer in this way, the second resin layer is formed between the first resin layer and the third resin layer so that the surface roughness or the like generated during the production of the unstretched polypropylene film is not noticeable. It can be laminated with a gap therebetween.

また、本発明の太陽電池用裏面保護シートにおいて、第２の樹脂層が酸化チタンを含有することが好ましい。   Moreover, in the back surface protection sheet for solar cells of this invention, it is preferable that a 2nd resin layer contains a titanium oxide.

このように第２の樹脂層を構成することにより、第２の樹脂層に紫外線を吸収または反射する機能を持たせることができる。   By configuring the second resin layer in this manner, the second resin layer can have a function of absorbing or reflecting ultraviolet rays.

さらに、本発明の太陽電池用裏面保護シートにおいて、第１の樹脂層が線状低密度ポリエチレンを含み、第３の樹脂層がポリフッ化ビニリデン、ポリフッ化ビニル、および、エチレンテトラフルオロエチレンからなる群より選択された少なくとも１種を含むことが好ましい。   Furthermore, in the back surface protective sheet for solar cells of the present invention, the first resin layer contains linear low density polyethylene, and the third resin layer is made of polyvinylidene fluoride, polyvinyl fluoride, and ethylene tetrafluoroethylene. It is preferable to include at least one more selected.

このように第１の樹脂層と第３の樹脂層を構成することにより、第１の樹脂層と第２の樹脂層との間、および、第２の樹脂層と第３の樹脂層との間で、高い接着性を長期的に維持することができる。   Thus, by comprising the 1st resin layer and the 3rd resin layer, between the 1st resin layer and the 2nd resin layer, and between the 2nd resin layer and the 3rd resin layer In the meantime, high adhesiveness can be maintained for a long time.

なお、本発明の太陽電池用裏面保護シートにおいて、第１の樹脂層と第２の樹脂層、および／または、第２の樹脂層と第３の樹脂層が、ウレタン系接着剤層を介在して固着されていることが好ましい。   In the solar cell back surface protective sheet of the present invention, the first resin layer and the second resin layer and / or the second resin layer and the third resin layer interpose a urethane adhesive layer. It is preferable that they are fixed.

本発明に従った太陽電池モジュールは、太陽電池素子を封止するために配置された充填材と、当該太陽電池モジュールの裏面側の充電材の外表面の上に第１の樹脂層が配置されるように固着された、上述の特徴を有する太陽電池用裏面保護シートとを備える。   In the solar cell module according to the present invention, the first resin layer is disposed on the filler disposed for sealing the solar cell element and the outer surface of the charging material on the back surface side of the solar cell module. And a back surface protection sheet for solar cells having the above-described characteristics, which are fixed in such a manner.

本発明によれば、加水分解を生じない無延伸ポリプロピレンを第２の樹脂層に用いることによって、第１の樹脂層と第２の樹脂層との間、および、第２の樹脂層と第３の樹脂層との間で、高い接着性を長期的に維持することができるので、太陽電池用裏面保護シートとそれを備えた太陽電池モジュールの長期的な耐候性を向上させることができる。   According to the present invention, by using unstretched polypropylene that does not cause hydrolysis in the second resin layer, the second resin layer and the third resin layer are provided between the first resin layer and the second resin layer. Since high adhesiveness can be maintained for a long time between the resin layers, the long-term weather resistance of the back surface protection sheet for solar cells and the solar cell module including the same can be improved.

本発明に従った一つの実施の形態としての太陽電池用裏面保護シートが適用される太陽電池モジュールの概略的な断面構造を示す図である。It is a figure which shows schematic sectional structure of the solar cell module to which the back surface protection sheet for solar cells as one embodiment according to this invention is applied. 本発明の太陽電池用裏面保護シートの一つの実施の形態を示す断面図である。It is sectional drawing which shows one embodiment of the back surface protection sheet for solar cells of this invention.

図１に示すように、太陽電池モジュール１００には、多数個の太陽電池素子１が配列されている。これらの太陽電池素子１は電極２を介して相互に接続配線３によって電気的に接続され、太陽電池モジュール１００全体としてはリード線４によって裏面側に端子５が取り出され、端子５は端子箱６に収納されている。エチレン-酢酸ビニル共重合体（ＥＶＡ）樹脂等からなる充填材７が多数個の太陽電池素子１を封止するために配置されている。太陽電池モジュール１００の受光面側に位置する充填材７の外表面には、透明ガラス層８が固着されている。太陽電池モジュールの設置面側に位置する充填材７の外表面には、本発明の太陽電池用裏面保護シート１０が固着されている。なお、太陽電池モジュール１００の側面にはアルミニウム製枠部材９がシール材を介して取り付けられている。   As shown in FIG. 1, a large number of solar cell elements 1 are arranged in the solar cell module 100. These solar cell elements 1 are electrically connected to each other through connection wires 3 via electrodes 2, and the solar cell module 100 as a whole has a terminal 5 taken out on the back side by a lead wire 4, and the terminal 5 is a terminal box 6. It is stored in. A filler 7 made of an ethylene-vinyl acetate copolymer (EVA) resin or the like is arranged to seal a large number of solar cell elements 1. A transparent glass layer 8 is fixed to the outer surface of the filler 7 located on the light receiving surface side of the solar cell module 100. The back surface protection sheet 10 for solar cells of this invention is adhering to the outer surface of the filler 7 located in the installation surface side of a solar cell module. An aluminum frame member 9 is attached to the side surface of the solar cell module 100 via a sealing material.

図２に示すように、太陽電池用裏面保護シート１０は、太陽電池モジュール１００（図１）から相対的に近い側（内側）に配置される外層から、第１の樹脂層１１、第２の樹脂層１２、第３の樹脂層１３の順に積層された積層体から構成される。第１の樹脂層１１と第２の樹脂層１２との間、第２の樹脂層１２と第３の樹脂層１３との間には、接着剤層１４が配置されている。言い換えれば、図２に示すように、この発明の一つの実施の形態である太陽電池モジュール用裏面保護シート１０においては、第２の樹脂層１２の両面にそれぞれ、第１の樹脂層１１と第３の樹脂層１３が積層される。   As shown in FIG. 2, the solar cell back surface protection sheet 10 includes a first resin layer 11, a second resin layer 2, and an outer layer disposed on the side (inside) relatively closer to the solar cell module 100 (FIG. 1). It is comprised from the laminated body laminated | stacked in order of the resin layer 12 and the 3rd resin layer 13. As shown in FIG. An adhesive layer 14 is disposed between the first resin layer 11 and the second resin layer 12 and between the second resin layer 12 and the third resin layer 13. In other words, as shown in FIG. 2, in the solar cell module back surface protective sheet 10 according to one embodiment of the present invention, the first resin layer 11 and the first resin layer 12 are formed on both surfaces of the second resin layer 12, respectively. Three resin layers 13 are laminated.

第２の樹脂層１２の材料には、無延伸ポリプロピレンを用いる。無延伸ポリプロピレンは、紫外線、空気中の水分等によって加水分解を起こさないため、第１の樹脂層１１と長期的に高い接着性を有することができる。また、第２の樹脂層１２には、無色透明を呈する無延伸ポリプロピレンフィルム、または、白色を呈する無延伸ポリプロピレンフィルムを用いることができる。第２の樹脂層１２は、白色を呈する無延伸ポリプロピレンフィルム、または、無色透明を呈する無延伸ポリプロピレンフィルムの両面に、無色透明を呈する無延伸ポリプロピレンフィルムが積層されることによって、構成されることが好ましい。この場合、無延伸ポリプロピレンフィルムの製造時に生じる表面の荒れ等が目立たないように、第２の樹脂層１２を第１の樹脂層１１と第３の樹脂層１３の間に介在させて積層することができる。   As the material of the second resin layer 12, unstretched polypropylene is used. Since unstretched polypropylene does not undergo hydrolysis due to ultraviolet rays, moisture in the air, etc., it can have high adhesion with the first resin layer 11 in the long term. The second resin layer 12 may be an unstretched polypropylene film exhibiting colorless transparency or an unstretched polypropylene film exhibiting white. The second resin layer 12 may be configured by laminating an unstretched polypropylene film exhibiting colorless and transparent on both surfaces of an unstretched polypropylene film exhibiting white or an unstretched polypropylene film exhibiting colorless and transparent. preferable. In this case, the second resin layer 12 is laminated between the first resin layer 11 and the third resin layer 13 so that the surface roughness or the like generated during the production of the unstretched polypropylene film is not noticeable. Can do.

第１の樹脂層１１および第３の樹脂層１３の材料は、特に限定されないが、たとえば、ポリエチレン（ＰＥ）（高密度ポリエチレン、低密度ポリエチレン、線状低密度ポリエチレン（ＬＬＤＰＥ））、ポリプロピレン（ＰＰ）、ポリブテン等のポリオレフィン系樹脂、（メタ）アクリル系樹脂、ポリ塩化ビニル系樹脂、ポリスチレン系樹脂、ポリ塩化ビニリデン系樹脂、エチレン-酢酸ビニル共重合体ケン化物、ポリビニルアルコール、ポリカーボネート系樹脂、フッ素系樹脂（ポリフッ化ビニリデン、ポリフッ化ビニル、エチレンテトラフルオロエチレン）、ポリ酢酸ビニル系樹脂、アセタール系樹脂、ポリエステル系樹脂（ポリエチレンテレフタレート（ＰＥＴ）、ポリブチレンテレフタレート、ポリエチレンナフタレート）、ポリアミド系樹脂、その他の各種の樹脂のフィルムまたはシートを使用することができる。これらの樹脂のフィルムまたはシートは、一軸または二軸方向に延伸されているものでもよい。第１の樹脂層１１が線状低密度ポリエチレンを含み、第３の樹脂層１３がポリフッ化ビニリデン、ポリフッ化ビニル（ＰＶＦ）、エチレンテトラフルオロエチレンから選択される１種または２種を含むことが好ましい。この場合、第１の樹脂層１１と第２の樹脂層１２との間、および、第２の樹脂層１２と第３の樹脂層１３との間で、高い接着性を長期的に維持することができる。   The material of the first resin layer 11 and the third resin layer 13 is not particularly limited. For example, polyethylene (PE) (high density polyethylene, low density polyethylene, linear low density polyethylene (LLDPE)), polypropylene (PP ), Polyolefin resins such as polybutene, (meth) acrylic resins, polyvinyl chloride resins, polystyrene resins, polyvinylidene chloride resins, saponified ethylene-vinyl acetate copolymers, polyvinyl alcohol, polycarbonate resins, fluorine Resin (polyvinylidene fluoride, polyvinyl fluoride, ethylene tetrafluoroethylene), polyvinyl acetate resin, acetal resin, polyester resin (polyethylene terephthalate (PET), polybutylene terephthalate, polyethylene naphthalate), polyamide A film or sheet of a resin or other various resins can be used. These resin films or sheets may be stretched uniaxially or biaxially. The first resin layer 11 includes linear low density polyethylene, and the third resin layer 13 includes one or two selected from polyvinylidene fluoride, polyvinyl fluoride (PVF), and ethylene tetrafluoroethylene. preferable. In this case, high adhesion between the first resin layer 11 and the second resin layer 12 and between the second resin layer 12 and the third resin layer 13 is maintained for a long time. Can do.

第１の樹脂層１１と第２の樹脂層１２、および、第２の樹脂層１２と第３の樹脂層１３の各々における積層方法は、公知の方法を用いればよく、たとえば、２液硬化型ウレタン系接着剤、ポリエーテルウレタン系接着剤、ポリエステル系接着剤、ポリエステルポリオール系接着剤、ポリエステルポリウレタンポリオール系接着剤等を用いたドライラミネート法、共押出し法、押出しコート法、アンカーコート剤を用いた熱ラミネート法等による方法を採用できる。特に芳香族イソシアネートまたは脂肪族イソシアネートの少なくとも１種を含むウレタン系接着剤を用いたドライラミネート法を好適に採用することができる。   The lamination method in each of the 1st resin layer 11 and the 2nd resin layer 12, and the 2nd resin layer 12 and the 3rd resin layer 13 should just use a well-known method, for example, 2 liquid curing type Uses dry lamination method, co-extrusion method, extrusion coating method, anchor coating agent using urethane adhesive, polyether urethane adhesive, polyester adhesive, polyester polyol adhesive, polyester polyurethane polyol adhesive, etc. It is possible to adopt a method such as a heat laminating method. In particular, a dry laminating method using a urethane-based adhesive containing at least one kind of aromatic isocyanate or aliphatic isocyanate can be suitably employed.

なお、紫外線を吸収または反射する目的で、第２の樹脂層１２に、酸化チタン、硫酸バリウム等の白色顔料、または、カーボン等の黒色顔料を混入してもよい。また、着色顔料以外の公知の紫外線吸収剤、水分吸収剤（乾燥剤）、酸素吸収剤、酸化防止剤等、公知の添加剤を第１の樹脂層１１または第３の樹脂層１３の少なくともいずれかに混入することもできる。   For the purpose of absorbing or reflecting ultraviolet rays, the second resin layer 12 may be mixed with a white pigment such as titanium oxide or barium sulfate, or a black pigment such as carbon. Further, known additives such as known UV absorbers, moisture absorbers (drying agents), oxygen absorbers, antioxidants and the like other than the color pigments may be added to at least one of the first resin layer 11 and the third resin layer 13. It can also be mixed in crab.

第１の樹脂層１１は、太陽電池モジュール１００（発電セル）側の表面の上に積層される。第１の樹脂層１１の厚みは、５０μｍ以上３００μｍ以下であることが好ましく、さらに好ましくは１２５μｍ以上２５０μｍ以下である。第１の樹脂層１１の厚みが５０μｍ未満であると、太陽電池モジュール１００（発電セル）と第２の樹脂層１２との絶縁が十分でない。また、第１の樹脂層１１の厚みが３００μｍを超えると、絶縁性が飽和し、太陽電池モジュール用裏面保護シート１０の重量が過重になったり、柔軟性が損なわれたりする。第１の樹脂層１１を構成する樹脂としては、線状低密度ポリエチレンフィルムが好適に使用される。   The first resin layer 11 is laminated on the surface on the solar cell module 100 (power generation cell) side. The thickness of the first resin layer 11 is preferably 50 μm or more and 300 μm or less, and more preferably 125 μm or more and 250 μm or less. If the thickness of the first resin layer 11 is less than 50 μm, the insulation between the solar cell module 100 (power generation cell) and the second resin layer 12 is not sufficient. Moreover, when the thickness of the 1st resin layer 11 exceeds 300 micrometers, insulation will be saturated, the weight of the back surface protection sheet 10 for solar cell modules will become heavy, or a softness | flexibility will be impaired. As the resin constituting the first resin layer 11, a linear low density polyethylene film is suitably used.

また、第１の樹脂層１１の太陽電池モジュール１００（発電セル）側の表面には、エチレン−酢酸ビニル共重合体（ＥＶＡ）樹脂等からなる充填材７（図１）との密着性を改善するために、プライマー層を形成してもよい。プライマー剤としてはアクリル系プライマー、ポリエステル系プライマー等を使用することが好ましい。プライマー剤の塗布量は２〜１５ｇ／ｍ2程度とすればよい。 Moreover, the adhesiveness with the filler 7 (FIG. 1) which consists of ethylene-vinyl acetate copolymer (EVA) resin etc. on the surface by the side of the solar cell module 100 (power generation cell) of the 1st resin layer 11 is improved. In order to do so, a primer layer may be formed. As the primer agent, it is preferable to use an acrylic primer, a polyester primer or the like. The application amount of the primer agent may be about 2 to 15 g / m 2 .

第２の樹脂層１２は、第１の樹脂層１１の太陽電池モジュール１００（発電セル）側と反対側の表面の上に積層される。第２の樹脂層１２の厚みは、２０μｍ以上２００μｍ以下であることが好ましく、さらに好ましくは２０μｍ以上５０μｍ以下である。また、第２の樹脂層１２が無色透明または白色の無延伸ポリプロピレンを少なくとも一層含むと、強度、耐熱性、耐久性等の点でより好ましい。第２の樹脂層１２の厚みが２０μｍ未満であると、耐候性が十分でない。また、第２の樹脂層１２の厚みが２００μｍを超えると、耐候性が飽和し、太陽電池モジュール用裏面保護シート１０の重量が過重になったり、柔軟性が損なわれたりする。白色を呈する無延伸ポリプロピレンとしては、酸化チタン顔料または硫酸バリウム顔料で着色された白色フィルムが好適に使用される。   The second resin layer 12 is laminated on the surface of the first resin layer 11 opposite to the solar cell module 100 (power generation cell) side. The thickness of the second resin layer 12 is preferably 20 μm or more and 200 μm or less, and more preferably 20 μm or more and 50 μm or less. In addition, it is more preferable in terms of strength, heat resistance, durability, and the like that the second resin layer 12 includes at least one layer of colorless, transparent or white unstretched polypropylene. When the thickness of the second resin layer 12 is less than 20 μm, the weather resistance is not sufficient. Moreover, when the thickness of the 2nd resin layer 12 exceeds 200 micrometers, a weather resistance will be saturated, the weight of the back surface protection sheet 10 for solar cell modules will become heavy, or a softness | flexibility will be impaired. As the unstretched polypropylene exhibiting white, a white film colored with a titanium oxide pigment or a barium sulfate pigment is preferably used.

太陽電池モジュール用裏面保護シート１０の実施例と比較例の試料を次のようにして作製した。   The sample of the Example and comparative example of the back surface protection sheet 10 for solar cell modules was produced as follows.

（実施例１）
密度が０．９１ｇ／ｃｍ3のポリエチレン樹脂（タマポリ株式会社製）１００ｋｇに、平均粒子径が０．３μｍの酸化チタン粒子２５ｋｇを添加し、十分に混練して線状低密度ポリエチレン樹脂組成物を調製した。この線状低密度ポリエチレン樹脂組成物を押出機で押出しすることにより、第１の樹脂層１１を構成するフィルムとして、厚みが５０μｍの第１のフィルムを作製した。次に、無色透明、白色、および、無色透明を呈する無延伸ポリプロピレン（三菱樹脂株式会社製）を順に重ね合わせて、厚み比率が１：８：１になるようにＴダイ押出機で共押出しすることにより、第２の樹脂層１２を構成するフィルムとして、厚みが２００μｍの第２のフィルムを作製した。白色を呈する無延伸ポリプロピレンは、無色透明の無延伸ポリプロピレン１００ｋｇに平均粒子径が０．３μｍの酸化チタン粒子２５ｋｇを混合することによって得た。第３の樹脂層１３を構成する第３のフィルムとして、厚みが３８μｍのポリフッ化ビニルフィルム（デュポン社製）を準備した。これらのフィルムを、第２のフィルムの一方の面の上に第１のフィルム、もう一方の面の上に第３のフィルムを配置して、それぞれのフィルムの間にドライラミネート用接着剤を介在させて、ドライラミネート法で接着することにより、太陽電池用裏面保護シート１０を作製した。なお、ドライラミネート用接着剤としては、三井化学株式会社製の製品名タケラックＡ３１５（１００重量部）と製品名タケネートＡ５０（１０重量部）を混合したポリウレタン系接着剤を、固形分の塗布量が５ｇ／ｍ2となるように調製して用いた。 Example 1
A linear low density polyethylene resin composition is prepared by adding 25 kg of titanium oxide particles having an average particle diameter of 0.3 μm to 100 kg of polyethylene resin (manufactured by Tamapoly Co., Ltd.) having a density of 0.91 g / cm 3 and thoroughly kneading. Prepared. By extruding this linear low density polyethylene resin composition with an extruder, a first film having a thickness of 50 μm was produced as a film constituting the first resin layer 11. Next, non-stretched polypropylene (manufactured by Mitsubishi Plastics Co., Ltd.) that is colorless and transparent, white, and colorless and transparent is superposed in order, and coextruded with a T-die extruder so that the thickness ratio is 1: 8: 1. As a result, a second film having a thickness of 200 μm was produced as a film constituting the second resin layer 12. White unstretched polypropylene was obtained by mixing 25 kg of titanium oxide particles having an average particle diameter of 0.3 μm with 100 kg of colorless and transparent unstretched polypropylene. As a third film constituting the third resin layer 13, a polyvinyl fluoride film (manufactured by DuPont) having a thickness of 38 μm was prepared. With these films, the first film is placed on one side of the second film and the third film is placed on the other side, and a dry laminating adhesive is interposed between each film. And the back surface protection sheet 10 for solar cells was produced by making it adhere | attach by the dry laminating method. In addition, as an adhesive for dry lamination, a polyurethane-based adhesive in which a product name Takerak A315 (100 parts by weight) manufactured by Mitsui Chemicals, Inc. and a product name Takenate A50 (10 parts by weight) are mixed has a solid coating amount. It was prepared and used so that it might become 5 g / m < 2 >.

（実施例２）
無色透明、無色透明、および、無色透明を呈する無延伸ポリプロピレン（三菱樹脂株式会社製）を順に重ね合わせて、厚み比率が１：８：１になるようにＴダイ押出機で共押出しすることにより、第２の樹脂層１２を構成するフィルムとして、厚みが２００μｍの第２のフィルムを作製したこと以外は、実施例１と同様にして太陽電池用裏面保護シート１０を作製した。 (Example 2)
By superimposing unstretched polypropylene (manufactured by Mitsubishi Plastics Co., Ltd.) that are colorless and transparent, colorless and transparent, and colorless and transparent in order, and co-extruding with a T-die extruder so that the thickness ratio is 1: 8: 1 A solar cell back surface protective sheet 10 was produced in the same manner as in Example 1 except that a second film having a thickness of 200 μm was produced as a film constituting the second resin layer 12.

（比較例１）
第２のフィルムとして厚みが２５０μｍのポリエステルフィルム（東洋紡株式会社製）、第１および第３のフィルムとして厚みが３８μｍのポリフッ化ビニルフィルム（デュポン社製）を準備した。実施例１と同様にして、それぞれのフィルムの間にドライラミネート用接着剤を介在させて、ドライラミネート法で接着することにより、太陽電池用裏面保護シート１０を作製した。 (Comparative Example 1)
A polyester film (made by Toyobo Co., Ltd.) having a thickness of 250 μm was prepared as the second film, and a polyvinyl fluoride film (made by DuPont) having a thickness of 38 μm was prepared as the first and third films. In the same manner as in Example 1, a solar cell back surface protective sheet 10 was produced by interposing a dry laminating adhesive between the respective films and adhering them by a dry laminating method.

（比較例２）
第１のフィルムとして、実施例１の第１のフィルムを用いたこと以外は、比較例１と同様にして太陽電池用裏面保護シート１０を作製した。 (Comparative Example 2)
A solar cell back surface protective sheet 10 was produced in the same manner as in Comparative Example 1 except that the first film of Example 1 was used as the first film.

（比較例３）
第３のフィルムとして、厚みが１２μｍのシリカ蒸着ポリエステルフィルム（三菱樹脂株式会社製）と厚みが３８μｍのポリフッ化ビニルフィルム（デュポン社製）との間にドライラミネート用接着剤を介在させて、ドライラミネート法で接着することにより作製し、第２のフィルムと第３のフィルムのシリカ蒸着ポリエステルフィルム側とを接着したこと以外は、比較例２と同様にして太陽電池用裏面保護シート１０を作製した。 (Comparative Example 3)
As a third film, an adhesive for dry laminating is interposed between a silica-deposited polyester film having a thickness of 12 μm (manufactured by Mitsubishi Plastics) and a polyvinyl fluoride film having a thickness of 38 μm (manufactured by DuPont). A solar cell back surface protective sheet 10 was produced in the same manner as in Comparative Example 2, except that the second film and the third film were adhered to the silica-deposited polyester film side by adhering by a laminating method. .

（測定方法）
実施例１〜２と比較例１〜３で作製した太陽電池用裏面保護シート１０について、以下の方法に従って、総厚み、引張強度保持率、引張伸度保持率、透湿度の変化、部分放電電圧、反射率を測定した。 (Measuring method)
About the back surface protection sheet 10 for solar cells produced in Examples 1-2 and Comparative Examples 1-3, according to the following method, total thickness, tensile strength retention, tensile elongation retention, change in moisture permeability, partial discharge voltage The reflectance was measured.

（総厚み）
作製した太陽電池用裏面保護シート１０の実厚み［μｍ］をマイクロゲージで測定した。 (Total thickness)
The actual thickness [μm] of the manufactured solar cell back surface protective sheet 10 was measured with a micro gauge.

（引張強度保持率・引張伸度保持率）
作製した太陽電池用裏面保護シート１０から、１０ｍｍ幅の試料を切り出し、オートグラフまたはこれに準ずる試験機を用いて、引張速度２００ｍｍ／ｍｉｎで引張強度と引張伸度を測定した。 (Tensile strength retention / tensile elongation retention)
A sample having a width of 10 mm was cut out from the manufactured back surface protective sheet 10 for solar cells, and the tensile strength and the tensile elongation were measured at a tensile speed of 200 mm / min using an autograph or a tester equivalent thereto.

試料作製直後（初期）に測定した引張強度と引張伸度の値と、プレッシャクッカー試験（試験条件：温度１２０℃、相対湿度１００％ＲＨ、２気圧）の条件下で２００時間保持した後に測定した引張強度と引張伸度の値とから、初期の値を１００％として引張強度保持率［％］と引張伸度保持率［％］を算出した。   Measured after holding for 200 hours under conditions of tensile strength and tensile elongation measured immediately after sample preparation (initial stage) and pressure cooker test (test conditions: temperature 120 ° C., relative humidity 100% RH, 2 atm). From the values of tensile strength and tensile elongation, the initial value was taken as 100%, and the tensile strength retention [%] and tensile elongation retention [%] were calculated.

なお、本来は、上記の引張強度保持率と引張伸度保持率は、太陽電池用裏面保護シート１０を屋外に実際に暴露させた状態で１０年間以上経過させて評価することが望ましい。しかし、このような長い時間をかけて屋外実暴露試験を行うことは困難である。そこで、この評価の代替として、上記の引張強度保持率と引張伸度保持率は、温度１２０℃、相対湿度１００％ＲＨ、２気圧の雰囲気下における環境促進試験としてのプレッシャクッカー試験を行って評価したものである。   Originally, it is desirable to evaluate the tensile strength retention rate and the tensile elongation retention rate after 10 years or more have passed in a state where the back protective sheet for solar cell 10 is actually exposed outdoors. However, it is difficult to perform an actual outdoor exposure test over such a long time. Therefore, as an alternative to this evaluation, the tensile strength retention rate and the tensile elongation retention rate are evaluated by performing a pressure cooker test as an environmental promotion test in an atmosphere of a temperature of 120 ° C., a relative humidity of 100% RH, and 2 atmospheres. It is a thing.

（透湿度の変化）
作製した太陽電池用裏面保護シート１０について、ＪＩＳ Ｋ ７１２９Ａ（透湿度試験法−Ｌｙｓｓｙ゜法）に準じて、透湿度［ｇ／ｍ2・ｄａｙ］を測定した。 (Change in moisture permeability)
About the produced solar cell back surface protection sheet 10, moisture permeability [g / m < 2 > * day] was measured according to JISK7129A (moisture permeability test method-Lyssy degree method).

試料作製直後（初期）と、プレッシャクッカー試験（ＰＣＴ）（試験条件：温度１２０℃、相対湿度１００％ＲＨ、２気圧）の条件下で１００時間保持した後とに透湿度を測定した。   Moisture permeability was measured immediately after sample preparation (initial stage) and after holding for 100 hours under pressure cooker test (PCT) conditions (test conditions: temperature 120 ° C., relative humidity 100% RH, 2 atm).

（部分放電電圧）
規格ＩＥＣ６０６６４−１に準拠して、太陽電池用裏面保護シート１０の部分放電電圧を測定した。 (Partial discharge voltage)
In accordance with the standard IEC606664-1, the partial discharge voltage of the solar cell back surface protective sheet 10 was measured.

（反射率）
日本分光株式会社製のマルチパーパス分光光度計を用いて、波長域２００〜２０００ｎｍにおける透過率を測定し、５５０ｎｍにおける反射率［％］を光線反射率として評価した。 (Reflectance)
Using a multi-purpose spectrophotometer manufactured by JASCO Corporation, the transmittance in the wavelength range of 200 to 2000 nm was measured, and the reflectance [%] at 550 nm was evaluated as the light reflectance.

以上の測定結果を表１に示す。   The above measurement results are shown in Table 1.

Figure 2012253164
Figure 2012253164

表１から、比較例１〜３では、ＰＣＴ後に、引張強度も引張伸度もＰＣＴ前（初期）（１００％）に対して０％と大きく低下したが、実施例１、２ではいずれも、引張強度も引張伸度もＰＣＴ前（初期）（１００％）に対して８６％以上を保持していたことがわかる。すなわち、第２の樹脂層１２に無延伸ポリエチレンを用いることによって、第１の樹脂層１１と第２の樹脂層１２との間、第２の樹脂層１２と第３の樹脂層１３との間の接着強度が保持された。また、ＰＣＴ後の透湿度は、比較例１〜３ではＰＣＴ前よりも０．３［ｇ／ｍ2・ｄａｙ］以上増加し、高くなったが、実施例１、２ではＰＣＴ前より０．１［ｇ／ｍ2・ｄａｙ］程度減少し、低くなり、低い値に抑えられたことがわかる。 From Table 1, in Comparative Examples 1 to 3, after PCT, both the tensile strength and the tensile elongation were greatly reduced to 0% compared to before PCT (initial) (100%), but in Examples 1 and 2, It can be seen that both the tensile strength and the tensile elongation were maintained at 86% or more with respect to the pre-PCT (initial) (100%). That is, by using unstretched polyethylene for the second resin layer 12, it is between the first resin layer 11 and the second resin layer 12, and between the second resin layer 12 and the third resin layer 13. The adhesive strength of was maintained. Further, the moisture permeability after PCT increased by 0.3 [g / m 2 · day] or more and increased in Comparative Examples 1 to 3 than before PCT, but in Examples 1 and 2, the moisture permeability was 0. 0 before PCT. It can be seen that it decreased by about 1 [g / m 2 · day], decreased, and suppressed to a low value.

今回開示された実施の形態と実施例はすべての点で例示であって制限的なものではないと考慮されるべきである。本発明の範囲は以上の実施の形態と実施例ではなく、特許請求の範囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての修正と変形を含むものであることが意図される。   It should be considered that the embodiments and examples disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is shown not by the above embodiments and examples but by the scope of claims, and is intended to include all modifications and variations within the meaning and scope equivalent to the scope of claims. .

本発明の太陽電池用裏面保護シートは、太陽電池モジュールの裏面側に配置されて用いられ、長期間にわたって耐候性を維持することが可能になる。   The solar cell back surface protective sheet of the present invention is used by being disposed on the back surface side of the solar cell module, and can maintain the weather resistance over a long period of time.

１０：太陽電池用裏面保護シート、１１：第１の樹脂層、１２：第２の樹脂層、１３：第３の樹脂層、１００：太陽電池モジュール
10: Back surface protection sheet for solar cell, 11: 1st resin layer, 12: 2nd resin layer, 13: 3rd resin layer, 100: Solar cell module

Claims (6)

太陽電池モジュールの裏面側に配置される太陽電池用裏面保護シートであって、
順に積層された第１の樹脂層、第２の樹脂層、および、第３の樹脂層を備え、
前記第２の樹脂層が無延伸ポリプロピレンを含む、太陽電池用裏面保護シート。 A solar cell back surface protection sheet disposed on the back surface side of the solar cell module,
A first resin layer, a second resin layer, and a third resin layer laminated in order,
The back surface protection sheet for solar cells in which a said 2nd resin layer contains unstretched polypropylene. 前記第２の樹脂層が、白色を呈する無延伸ポリプロピレンフィルム、または、無色透明を呈する無延伸ポリプロピレンフィルムからなる第１のフィルムと、前記第１のフィルムの両面に積層された、無色透明を呈する無延伸ポリプロピレンフィルムからなる第２のフィルムとを含む、請求項１に記載の太陽電池用裏面保護シート。   The second resin layer is colorless and transparent laminated on both sides of the first film made of an unstretched polypropylene film exhibiting white color or an unstretched polypropylene film exhibiting colorless and transparent, and the first film. The back surface protection sheet for solar cells of Claim 1 containing the 2nd film which consists of an unstretched polypropylene film. 前記第２の樹脂層が、酸化チタンを含有する、請求項１または請求項２のいずれか１項に記載の太陽電池用裏面保護シート。   The back surface protection sheet for solar cells of any one of Claim 1 or Claim 2 in which a said 2nd resin layer contains a titanium oxide. 前記第１の樹脂層が線状低密度ポリエチレンを含み、前記第３の樹脂層がポリフッ化ビニリデン、ポリフッ化ビニル、および、エチレンテトラフルオロエチレンからなる群より選択された少なくとも１種を含む、請求項１から請求項３までのいずれか１項に記載の太陽電池用裏面保護シート。   The first resin layer includes linear low density polyethylene, and the third resin layer includes at least one selected from the group consisting of polyvinylidene fluoride, polyvinyl fluoride, and ethylene tetrafluoroethylene. The back surface protection sheet for solar cells of any one of Claim 1- Claim 3. 前記第１の樹脂層と前記第２の樹脂層、および／または、前記第２の樹脂層と前記第３の樹脂層が、ウレタン系接着剤層を介在して固着されている、請求項１から請求項４までのいずれか１項に記載の太陽電池用裏面保護シート。   The first resin layer and the second resin layer and / or the second resin layer and the third resin layer are fixed to each other with a urethane adhesive layer interposed therebetween. The back surface protection sheet for solar cells of any one of Claims 1-4. 太陽電池素子を封止するために配置された充填材と、
当該太陽電池モジュールの裏面側の前記充電材の外表面の上に前記第１の樹脂層が配置されるように固着された、請求項１から請求項５までのいずれか１項に記載の太陽電池用裏面保護シートとを備えた、太陽電池モジュール。
A filler disposed to seal the solar cell element;
The sun according to any one of claims 1 to 5, which is fixed so that the first resin layer is disposed on an outer surface of the charging material on a back surface side of the solar cell module. The solar cell module provided with the back surface protection sheet for batteries.
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