JP2003347570A - Protective sheet for back side of solar battery - Google Patents
Protective sheet for back side of solar batteryInfo
- Publication number
- JP2003347570A JP2003347570A JP2002152753A JP2002152753A JP2003347570A JP 2003347570 A JP2003347570 A JP 2003347570A JP 2002152753 A JP2002152753 A JP 2002152753A JP 2002152753 A JP2002152753 A JP 2002152753A JP 2003347570 A JP2003347570 A JP 2003347570A
- Authority
- JP
- Japan
- Prior art keywords
- solar cell
- sheet
- protective sheet
- dimensional stability
- solar battery
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- 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
Landscapes
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Photovoltaic Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、加工時の寸法安定
性や使用時の電気絶縁性に優れる太陽電池用裏面保護シ
ートと、それを用いた太陽電池及び太陽電池モジュール
に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back protective sheet for a solar cell having excellent dimensional stability during processing and electrical insulation during use, and a solar cell and a solar cell module using the same.
【０００２】[0002]
【従来の技術】従来、屋外で用いる太陽電池モジュール
の場合、機械的強度や環境雰囲気下で劣化し難いという
耐環境性能を高めて信頼性を確保するため、太陽電池素
子を強化ガラス板や金属基板上に合成樹脂を用いてラミ
ネートして封入する構造が一般的に用いられている。2. Description of the Related Art Conventionally, in the case of a solar cell module used outdoors, a solar cell element is made of a reinforced glass plate or a metal in order to secure mechanical reliability and environmental resistance, which is hardly deteriorated in an environmental atmosphere, and to secure reliability. A structure is generally used in which a synthetic resin is laminated on a substrate and sealed.
【０００３】より具体的にラミネート方法によるモジュ
ール構造を説明すると、受光側から強化ガラス板上にエ
チレン−ビニルアセテート共重合体（以下、「ＥＶＡ」
という）シート、太陽電地素子、ＥＶＡシート、そして
太陽電池用裏面保護シートとしてアルミニウム箔をフッ
化ビニルシートで挟んで構成したシート（以下、「アル
ミ−フッ素複合シート」という）をこの順に積層して加
熱圧着し、さらに、アルミ−フッ素複合シート表面には
電源取出し用の端子ボックスがシリコーン系シーラント
により固定されている構造のものが用いられている。[0003] More specifically, a module structure by a lamination method will be described. An ethylene-vinyl acetate copolymer (hereinafter, referred to as "EVA") is placed on a tempered glass plate from the light receiving side.
Sheet), a solar element, an EVA sheet, and a sheet (hereinafter, referred to as an "aluminum-fluorine composite sheet") in which an aluminum foil is sandwiched between vinyl fluoride sheets as a back surface protection sheet for a solar cell. Then, a terminal box for taking out a power supply is fixed on the surface of the aluminum-fluorine composite sheet with a silicone-based sealant.
【０００４】また、太陽電池がアモルファスシリコンの
ような薄膜太陽電池の場合には、強化ガラス板上に直接
太陽電池素子を形成し、この上にＥＶＡシート、アルミ
−フッ素複合シートを積層して加熱圧着したものが用い
られている。このような従来の構造においては、太陽電
池用裏面保護シートとしてアルミ−フッ素複合シートを
用いているのでモジュールの信頼性が高く、かつ、生産
性が極めて高いという優れた特徴を有している。さらに
は近年、アルミ−フッ素複合シートを使わなくても対応
可能な使用環境の穏やかな用途に、太陽電池用裏面保護
シートとしてポリエチレンテレフタレート（以下、ＰＥ
Ｔという）フィルムに蒸着層を設けて防湿性や信頼性を
付与した加工シートやフッ化ビニルシートが提案されて
いる。In the case where the solar cell is a thin film solar cell such as amorphous silicon, a solar cell element is formed directly on a tempered glass plate, and an EVA sheet and an aluminum-fluorine composite sheet are laminated thereon and heated. A crimped one is used. Such a conventional structure has excellent features that the reliability of the module is high and the productivity is extremely high because the aluminum-fluorine composite sheet is used as the backsheet for the solar cell. Furthermore, in recent years, polyethylene terephthalate (hereinafter referred to as PE) has been used as a backside protective sheet for solar cells in applications where the use environment can be moderated without using an aluminum-fluorine composite sheet.
There has been proposed a processed sheet or a vinyl fluoride sheet in which a film is provided with a vapor-deposited layer to impart moisture-proof property and reliability.
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記従
来技術のうち、前者の太陽電池用裏面保護シートとして
アルミ−フッ素複合シートを用いる技術では原材料自体
高価な厚手のフッ化ビニル層をアルミニウム箔の両側２
層に用いているので、モジュール価格が高価なものにな
ってしまうとともに、太陽電池素子とアルミ−フッ素複
合シートのアルミニウム箔との間で短絡を起こし易いと
いう問題もあった。However, of the above-mentioned prior arts, in the former technique using an aluminum-fluorine composite sheet as the back protective sheet for a solar cell, the raw material itself has a thick vinyl fluoride layer which is expensive on both sides of the aluminum foil. 2
Since it is used for the layers, the module price becomes expensive and there is a problem that a short circuit easily occurs between the solar cell element and the aluminum foil of the aluminum-fluorine composite sheet.
【０００６】また、後者の、太陽電池用裏面保護シート
としてＰＥＴフィルムに防湿性や信頼性を付与した加工
シートやフッ化ビニルシートを用いる技術では、寸法安
定性が充分でなく熱収縮や反り等の問題を抱えていた。
さらに詳細なメカニズムは明らかではないが、ＰＥＴフ
ィルムに防湿性や信頼性を付与した加工シートやフッ化
ビニルシートを用いた場合には端面からの浮きや剥離な
ど外観不良、それに伴う防湿性低下からの発電性低下が
見られ、剥離に至らないまでも該作用が残留応力となり
発電回路への抵抗となるためか、同様に発電性低下を招
き、全てを満足する性能を持った、太陽電池用裏面保護
シートは提供されていない実情があった。Further, in the latter technique of using a processed sheet or a polyvinyl fluoride sheet in which a PET film is provided with moisture resistance and reliability as a backside protective sheet for a solar cell, the dimensional stability is not sufficient, and heat shrinkage and warpage are caused. Had the problem.
Although the detailed mechanism is not clear, when using a processed sheet or a vinyl fluoride sheet with moisture proof and reliability added to the PET film, the appearance is poor such as floating or peeling off from the end face, and the moisture proof property is reduced due to it. For the solar cell, which has performance that satisfies all of the above, probably because the action is a residual stress even if it does not lead to peeling and the action becomes a resistance to the power generation circuit. There was a situation where a back protective sheet was not provided.
【０００７】[0007]
【課題を解決するための手段】本発明は上記従来技術の
問題点を解決でき、安価にして寸法安定性の極めて高い
太陽電池用裏面保護シートを提供し、そして、この太陽
電池用裏面保護シートを用いた太陽電池や太陽電池モジ
ュールを提供するものであり、その要旨とするところ
は、厚さ３０μm以下のフッ素系樹脂シートからなるこ
とを特徴とする太陽電池用裏面保護シートにある。ま
た、フッ素系樹脂シートを構成するフッ素系樹脂がテト
ラフルオロエチレン−ビニリデンフルオリド共重合体、
ヘキサフルオロエチレン−ビニリデンフルオリド共重合
体、テトラフルオロエチレン−ヘキサフルオロエチレン
−ビニリデンフルオリド共重合体のいずれかからなる請
求項１記載の太陽電池用裏面保護シートにある。さら
に、請求項１乃至請求項２記載の太陽電池用裏面保護シ
ートを用いた太陽電池及び太陽電池モジュールにある。SUMMARY OF THE INVENTION The present invention can solve the above-mentioned problems of the prior art, provide an inexpensive and extremely dimensional-stable backsheet for solar cells, and provide this backsheet for solar cells. And a solar cell module using the same. The gist of the present invention resides in a backsheet for a solar cell, which is made of a fluorine-based resin sheet having a thickness of 30 μm or less. Further, the fluororesin constituting the fluororesin sheet is a tetrafluoroethylene-vinylidene fluoride copolymer,
The solar cell back protective sheet according to claim 1, comprising a hexafluoroethylene-vinylidene fluoride copolymer or a tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride copolymer. Further, there is provided a solar cell and a solar cell module using the back protective sheet for a solar cell according to claim 1 or 2.
【０００８】[0008]
【発明の実施の形態】本発明において、フッ素系樹脂シ
ートは厚さに関しては３０μｍ以下が寸法安定性、価格
の面で好適で１５μｍ以下がより好ましい。そして、あ
まり薄いと太陽電池モジュールを保護する能力が薄れる
ので３μｍ以上、望ましくは１０μｍ以上有るのが、保
護能力や製膜性の上で好ましい。BEST MODE FOR CARRYING OUT THE INVENTION In the present invention, the thickness of a fluororesin sheet is preferably 30 μm or less in terms of dimensional stability and cost, and more preferably 15 μm or less. If the thickness is too small, the ability to protect the solar cell module is reduced. Therefore, the thickness is preferably 3 μm or more, and more preferably 10 μm or more, from the viewpoint of protection ability and film forming property.
【０００９】該フッ素系樹脂シートに適用されるフッ素
系樹脂としては特に制限なく、モノマー成分としてフッ
化ビニリデン、フッ化ビニル、トリフルオロエチレン、
テトラフルオロエチレン、ペンタフルオロプロピレン、
ヘキサフルオロプロピレン、パーフルオロアルキルビニ
ルエーテル、クロロトリフルオロエチレン等の含フッ素
モノマー成分を含む単独重合体及び共重合体、あるいは
前記成分にエチレン、プロピレン、アルキルビニルエー
テル等の非フッ素系モノマー成分が併用された共重合体
などが挙げられる。The fluororesin applied to the fluororesin sheet is not particularly limited, and vinylidene fluoride, vinyl fluoride, trifluoroethylene,
Tetrafluoroethylene, pentafluoropropylene,
Homopolymers and copolymers containing fluorine-containing monomer components such as hexafluoropropylene, perfluoroalkyl vinyl ether, and chlorotrifluoroethylene, or non-fluorine-based monomer components such as ethylene, propylene, and alkyl vinyl ether were used in combination with the above components. And copolymers.
【００１０】特に、残留応力を小さくする効果による寸
法安定性の面で軟質であり、かつ、使用環境温度以上の
耐熱性を有する観点でテトラフルオロエチレン−ビニリ
デンフルオリド共重合体、ヘキサフルオロエチレン−ビ
ニリデンフルオリド共重合体、テトラフルオロエチレン
−ヘキサフルオロエチレン−ビニリデンフルオリド共重
合体のいずれかからなる単独体、ブレンド体、積層体が
好適である。ビニリデンフルオリドが共重合されている
事により、ＥＶＡシート等の太陽電池モジュール加工時
の接着性においても有利に作用する。[0010] In particular, a tetrafluoroethylene-vinylidene fluoride copolymer and a hexafluoroethylene copolymer are soft from the viewpoint of dimensional stability due to the effect of reducing residual stress, and have heat resistance higher than the ambient temperature of use. A single body, a blend, or a laminate composed of any of a vinylidene fluoride copolymer and a tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride copolymer is preferable. The copolymerization of vinylidene fluoride also has an advantageous effect on the adhesiveness when processing a solar cell module such as an EVA sheet.
【００１１】樹脂組成物としてこれら主成分を構成する
樹脂の他に顔料、充填剤、衝撃改良剤、光安定剤、紫外
線吸収・遮蔽剤、加工助剤、架橋剤、結晶核剤などの各
種添加剤をフッ素系樹脂シートの耐久性、柔軟性、接着
性ブレンド体の相溶性を損なわず、溶解度や分散安定度
を超えてブリードアウトやプレートアウトを起こさない
範囲で添加することができる。As a resin composition, in addition to the resins constituting the main components, various additives such as pigments, fillers, impact modifiers, light stabilizers, ultraviolet absorbing / shielding agents, processing aids, crosslinking agents, and crystal nucleating agents are added. The agent can be added within a range that does not impair the durability, flexibility, and compatibility of the adhesive blend, and does not exceed the solubility or dispersion stability and does not cause bleed-out or plate-out.
【００１２】フッ素系樹脂シートの成形法は特に制限は
なく、既存の溶融押出法、プレス法、焼結法、スカイブ
法、エマルジョンコーティング法、溶液コーティング法
等が可能である。The method of forming the fluororesin sheet is not particularly limited, and any of the existing melt extrusion method, press method, sintering method, skive method, emulsion coating method, solution coating method and the like can be used.
【００１３】フッ素系樹脂シートのＥＶＡシートやシリ
コーンシーラントとの接着性を強化するうえでコロナ処
理、プラズマ処理、ナトリウム−アンモニア処理などの
方法によるエッチング、酸化等の表面処理やアクリル
系、ウレタン系、アミン系等の樹脂プライマーコーティ
ングもしくはラミネートもしくは共押出加工等を単独も
しくは組み合わせて行うことは効果的である。In order to enhance the adhesiveness of the fluororesin sheet to the EVA sheet or the silicone sealant, surface treatment such as etching, oxidation and the like, such as corona treatment, plasma treatment and sodium-ammonia treatment, and acrylic, urethane, etc. It is effective to carry out resin primer coating, laminating or co-extrusion of an amine or the like alone or in combination.
【００１４】上記において本発明の太陽電池用裏面保護
シートについて説明したが、次にこの太陽電池用裏面保
護シート用いて裏面側を封止した太陽電池について説明
する。In the above, the back protective sheet for a solar cell according to the present invention has been described. Next, a solar cell in which the back side is sealed using the back protective sheet for a solar cell will be described.
【００１５】通常、太陽電池は強化ガラスからなるガラ
ス基板上に透明導電薄膜からなる透明電極とアモルファ
スシリコン系半導体と金属電極を所定の形状に積層して
太陽電池素子を複数形成するとともに、この太陽電池素
子を必要に応じて直列または並列に接続して必要とする
電圧と電流を得るように構成されている。この太陽電池
は、太陽電池素子を保護するため、太陽電池素子側の面
に、上記太陽電池用裏面保護シートが配設され、加熱接
着される。Usually, a solar cell is formed by laminating a transparent electrode made of a transparent conductive thin film, an amorphous silicon-based semiconductor, and a metal electrode on a glass substrate made of tempered glass in a predetermined shape to form a plurality of solar cell elements. The battery elements are configured to be connected in series or parallel as required to obtain the required voltage and current. In this solar cell, in order to protect the solar cell element, the above-mentioned back sheet for a solar cell is disposed on the surface on the side of the solar cell element, and is adhered by heating.
【００１６】太陽電池用裏面保護シートによって封止さ
れた太陽電池は耐候性や寸法安定性を備えた本発明の太
陽電池用裏面保護シートによって、太陽電池素子が覆わ
れている。したがって、太陽電池素子は優れた耐候性や
寸法安定性に基づく信頼性を有し、維持確保を図ること
ができる。また、前述と同様の構成にかかる太陽電池素
子の側に、前述と同様のシートからなる太陽電池用裏面
保護シートをＥＶＡシートによって真空ラミネート法を
用いて加熱接着しても良い。The solar cell sealed with the solar cell back protection sheet is covered with the solar cell back protection sheet of the present invention having weather resistance and dimensional stability. Therefore, the solar cell element has reliability based on excellent weather resistance and dimensional stability, and can maintain and secure it. Further, a solar cell back surface protection sheet made of the same sheet as described above may be heated and adhered to the side of the solar cell element having the same configuration as above using an EVA sheet using a vacuum lamination method.
【００１７】以上ではアモルファスシリコン系半導体層
を用いた太陽電池素子を例に説明したが、本発明におけ
る太陽電池素子は結晶系のものであってもよい。すなわ
ち、太陽電池素子はシリコン単結晶のウエハーから作製
された半導体層の片面に透明電極を形成するとともに他
の片面に金属電極を形成して構成されていて、複数の太
陽電池素子はワイヤーボンデイングにより直列・並列に
接続され、所定の電流・電圧を出力し得るように太陽電
池が構成されている。かかる太陽電池は、強化ガラス／
ＥＶＡシート／太陽電池素子／ＥＶＡシート／太陽電池
用裏面保護シートの順に積層し、真空ラミネート法を用
いて加熱接着されて、強化ガラスと太陽電池用裏面保護
シートとの間に封止される。太陽電池素子は、前述と同
様に太陽電池用裏面保護シートにより耐候性や寸法安定
性に基づく信頼性を確保することができる。Although a solar cell element using an amorphous silicon-based semiconductor layer has been described above as an example, the solar cell element in the present invention may be of a crystalline type. That is, the solar cell element is configured by forming a transparent electrode on one side of a semiconductor layer made from a silicon single crystal wafer and forming a metal electrode on the other side, and a plurality of solar cell elements are formed by wire bonding. The solar cell is configured to be connected in series / parallel and to output a predetermined current / voltage. Such solar cells are made of tempered glass /
The EVA sheet / solar cell element / EVA sheet / backside protection sheet for solar cells are laminated in this order, and are bonded by heating using a vacuum laminating method to be sealed between the tempered glass and the backside protection sheet for solar cells. In the solar cell element, the reliability based on weather resistance and dimensional stability can be secured by the back protective sheet for the solar cell as described above.
【００１８】本発明の太陽電池用裏面保護シートにより
裏面側を封止した太陽電池は驚くべきことに防湿性の面
では従来のアルミ−フッ素複合シートに比べて特に優れ
ている構成ではなく、信頼性が確保される作用機構は十
分説明し得ないが、おそらくは寸法安定性を考慮した構
成がより効果的に作用して信頼性が確保されると考えら
れる。以上本発明について種々説明したが、本発明は説
明に用いた例に限定されるものでないことはいうまでも
なく、たとえば、上述の例を種々組み合わせて実施する
ことも可能である。以下、本発明を実施例により詳細に
説明する。Surprisingly, the solar cell in which the back side is sealed by the back protective sheet for a solar cell of the present invention is not particularly superior in the moisture proof property to the conventional aluminum-fluorine composite sheet. Although an action mechanism that ensures the performance cannot be sufficiently explained, it is considered that a configuration in consideration of the dimensional stability works more effectively to ensure the reliability. Although the present invention has been described in various ways, it is needless to say that the present invention is not limited to the examples used in the description. For example, the present invention can be implemented in various combinations. Hereinafter, the present invention will be described in detail with reference to examples.
【００１９】[0019]
【実施例】（実施例１）エチレン−テトラフルオロエチ
レン共重合体（融点２６５℃）を押出機により口金温度
３１０℃にて押出して厚さ３０μmに加工した後、両面
コロナ処理を行い裏面保護シートを得た。得られた太陽
電池用裏面保護シートの寸法安定性、太陽電池用モジュ
ール加工時の寸法安定性、太陽電池の使用環境下発電性
についての相当の信頼性を評価した。その結果、順に
△、○、○であった。なお、これら評価方法は以下の方
法に従った。Example 1 An ethylene-tetrafluoroethylene copolymer (melting point: 265 ° C.) was extruded at a die temperature of 310 ° C. by an extruder and processed to a thickness of 30 μm, and then subjected to a corona treatment on both sides to provide a backside protective sheet. I got The dimensional stability of the obtained back protective sheet for solar cells, the dimensional stability during processing of a solar cell module, and the considerable reliability of power generation under the usage environment of the solar cells were evaluated. As a result, the order was Δ, ○, ○. In addition, these evaluation methods followed the following method.
【００２０】＜太陽電池用裏面保護シートの寸法安定性
＞厚さ０．０４mm長さ１００mmのアルミニウム箔に、同
サイズの０．４mm厚さのＥＶＡシート、太陽電池用裏面
保護シートの順にセットして８０℃１０分間で真空プレ
スラミネートし、１５０℃３０分でオーブン中にて該積
層体に１０３Paの圧力となる平滑な金属板のおもりを載
せて同温度での積層体の反りを緩和させてなくすと同時
にＥＶＡシートを架橋し、時間経過後おもりを外して２
０℃下に２時間放置した後の反りの量を次式１／ρで表
して寸法安定性の指標とし、以下の判定によった。
◎：１／ρ＜１／１６０
○：１／１６０≦１／ρ＜１／８０
△：１／８０≦１／ρ＜１／１０
×：１／１０≦１／ρ
ここで式中で使用する記号の意味は以下の通りである。
１／ρ＝８ｄ／ｌ２
１／ρ：反りの量（１／mm）
ｌ：アルミニウム箔を外にして反りによりできたシート
の弧の弦の長さ（ｍｍ）ｄ：弦ｌの中点と同中点から弦
に垂直方向のシートの弧の交点間の距離（ｍｍ）<Dimensional stability of back protective sheet for solar cell> An EVA sheet of the same size, 0.4 mm thick, and a back protective sheet for solar cell are set in this order on an aluminum foil having a thickness of 0.04 mm and a length of 100 mm. Vacuum press lamination at 80 ° C. for 10 minutes, and place a smooth metal plate weight having a pressure of 10 3 Pa on the laminate in an oven at 150 ° C. for 30 minutes to reduce the warpage of the laminate at the same temperature. At the same time, the EVA sheet is crosslinked and the weight is removed after the passage of time.
The amount of warpage after leaving at 0 ° C. for 2 hours was represented by the following formula 1 / ρ, which was used as an index of dimensional stability. ：: 1 / ρ <1/160 ○: 1/160 ≦ 1 / ρ <1/80 △: 1/80 ≦ 1 / ρ <1/10 ×: 1/10 ≦ 1 / ρ The meanings of the symbols are as follows. 1 / ρ = 8d / l 2 1 / ρ: amount of warpage (1 / mm) l: chord length (mm) of sheet arc formed by warping with aluminum foil out d: midpoint of chord l And the distance from the midpoint to the intersection of the sheet arcs perpendicular to the chord (mm)
【００２１】＜太陽電池用モジュール加工時の寸法安定
性＞２００ｍｍ×３００ｍｍの大きさで厚さ３ｍｍのガ
ラス板上に、同じ大きさで厚さ０．４mmのＥＶＡシー
ト、太陽電池用裏面保護シートの順に重ね、８０℃１０
分の条件で真空熱プレスして仮接着し、１５０℃のオー
ブン中で３０分間放置して、接着（ＥＶＡシートの架
橋）を完了し、太陽電池に相当する評価用サンプルを得
た。これを−４０℃と９０℃の間の温度で各温度の保持
時間及び昇温ならびに降温の変化時間をいずれも１時間
３０分とした１サイクル６時間の温度サイクル試験を６
００時間行い、サンプルを得た直後ならびに試験経過後
の太陽電池用裏面保護シート端面の様子を観察し以下の
判定により評価した。
○：いずれの場合も浮き、剥離、収縮なし
△：少なくともどちらかで浮き、剥離、収縮のいずれか
が３ｍｍ未満で発生
×：少なくともどちらかで浮き、剥離、収縮のいずれか
が３ｍｍ以上発生<Dimensional stability during processing of solar cell module> An EVA sheet of the same size and a thickness of 0.4 mm on a glass plate of 200 mm x 300 mm and a thickness of 3 mm, a back surface protection sheet for a solar cell At 80 ° C 10
And then temporarily bonded in a vacuum hot press under the conditions of 1 minute and left in an oven at 150 ° C. for 30 minutes to complete the bonding (crosslinking of the EVA sheet) to obtain a sample for evaluation corresponding to a solar cell. This was carried out at a temperature between −40 ° C. and 90 ° C. in a 1-cycle 6-hour temperature cycle test in which each of the holding time at each temperature and the change time of the temperature increase and decrease was 1 hour 30 minutes.
The test was performed for 00 hours, and the state of the end face of the backsheet for solar cells immediately after obtaining the sample and after the test was observed and evaluated by the following judgment. ：: No floating, peeling, or shrinking in any case Δ: At least one of floating, peeling, or shrinking occurs when less than 3 mm ×: At least one of floating, peeling, or shrinking occurs at least 3 mm
【００２２】＜太陽電池の使用環境下発電性についての
相当の信頼性＞２００ｍｍ×３００ｍｍの大きさで厚さ
３ｍｍのガラス板上に厚さ１００ｎｍのアルミニウムを
蒸着加工し、その上に同じ大きさで厚さ０．４ｍｍのＥ
ＶＡシート、太陽電池用裏面保護シートの順に重ね、８
０℃１０分の条件で真空熱プレスして仮接着し、１５０
℃のオーブン中で３０分間放置して、接着（ＥＶＡシー
トの架橋）を完了し、太陽電池に相当する評価用サンプ
ルを得た。該サンプルの外周をシリコーンシーラントで
覆った後、８５℃９０％相対湿度中に６００時間置き、
太陽電池の高温下の湿度による劣化の具合に相当するア
ルミニウム蒸着層の消失の状態を観察し、以下の判定に
より評価した。
○：アルミニウムの薄肉化ないしは消失が認められない
△：アルミニウムの薄肉化ないしは消失が全面積の３％
未満で発生
×：アルミニウムの薄肉化ないしは消失が全面積の３％
以上発生<A considerable reliability of the power generation under the usage environment of the solar cell> 100 nm thick aluminum is vapor-deposited on a glass plate having a size of 200 mm × 300 mm and a thickness of 3 mm, and the same size is further formed thereon. 0.4mm thick E
VA sheet, back surface protection sheet for solar cells in order, 8
Temporarily bonded by vacuum hot pressing at 0 ° C for 10 minutes, 150
It was left in an oven at a temperature of 30 ° C. for 30 minutes to complete the adhesion (crosslinking of the EVA sheet) to obtain a sample for evaluation corresponding to a solar cell. After covering the periphery of the sample with a silicone sealant, the sample was placed at 85 ° C. and 90% relative humidity for 600 hours,
The state of disappearance of the aluminum vapor-deposited layer corresponding to the degree of deterioration of the solar cell due to humidity under high temperature was observed, and evaluated by the following judgment. ：: No reduction or loss of aluminum is observed. △: 3% reduction or reduction of aluminum
×: less than 3% of the total area of aluminum thinning or disappearance
Occurs
【００２３】（実施例２）エチレン−テトラフルオロエ
チレン共重合体（融点２６５℃）を押出機により口金温
度３１０℃にて押出して厚さ１０μmに加工した後、両
面コロナ処理を行い太陽電池用裏面保護シートを得た。
実施例１同様に評価したところ順に○、○、○であっ
た。Example 2 An ethylene-tetrafluoroethylene copolymer (melting point: 265 ° C.) was extruded at a die temperature of 310 ° C. by an extruder to be processed to a thickness of 10 μm, and then subjected to a corona treatment on both sides to produce a back surface for a solar cell. A protective sheet was obtained.
When evaluated in the same manner as in Example 1, the order was ○, ○, and 順 に.
【００２４】（実施例３）テトラフルオロエチレン−ヘ
キサフルオロエチレン−ビニリデンフルオリド共重合体
（融点１７０℃）を押出機により口金温度２７０℃にて
押出して厚さ３０μｍに加工した後、両面にアクリル系
コーティング剤を０．５μｍコートし太陽電池用裏面保
護シートを得た。実施例１同様に評価したところ順に
◎、○、○であった。Example 3 A tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride copolymer (melting point: 170 ° C.) was extruded by an extruder at a die temperature of 270 ° C., processed into a thickness of 30 μm, and then acrylic on both sides. A 0.5 μm coating was used to obtain a backside protective sheet for solar cells. When evaluated in the same manner as in Example 1, the order was ◎, ○, and 順 に in order.
【００２５】（実施例４）エチレン−テトラフルオロエ
チレン共重合体（融点２６５℃）を押出機により口金温
度３１０℃にて押出して厚さ３μmに加工した後、両面
コロナ処理を行い太陽電池用裏面保護シートを得た。
実施例１同様に評価したところ順に、○、△、△であっ
た。また、押出して加工する際にいくぶん、しわが入り
やすい嫌いがあった。Example 4 An ethylene-tetrafluoroethylene copolymer (melting point: 265 ° C.) was extruded at a die temperature of 310 ° C. by an extruder to be processed to a thickness of 3 μm, and then subjected to a corona treatment on both sides to produce a back surface for a solar cell. A protective sheet was obtained.
When evaluated in the same manner as in Example 1, the order was ○, Δ, and Δ. Also, when they were extruded and processed, they tended to dislike wrinkles.
【００２６】（比較例１）エチレン−テトラフルオロエ
チレン共重合体（融点２６５℃）を押出機により口金温
度３１０℃にて押出して厚さ１００μｍに加工した後、
両面コロナ処理を行い太陽電池用裏面保護シートを得
た。実施例１同様に評価したところ順に×、△、×であ
った。Comparative Example 1 An ethylene-tetrafluoroethylene copolymer (melting point: 265 ° C.) was extruded at a die temperature of 310 ° C. by an extruder and processed to a thickness of 100 μm.
A double-sided corona treatment was performed to obtain a backsheet for a solar cell. When evaluated in the same manner as in Example 1, the evaluation was x, Δ, and x in order.
【００２７】（比較例２）フッ化ビニルシート（デュポ
ン製、３８μｍ）をそのまま太陽電池用裏面保護シート
として用い、実施例１同様に評価したところ順に×、
△、×であった。Comparative Example 2 A vinyl fluoride sheet (made by DuPont, 38 μm) was used as it was as a back protective sheet for solar cells, and evaluated in the same manner as in Example 1.
Δ, ×.
【００２８】実施例１〜３に示す本発明の本発明の厚さ
３０μｍ以下のフッ素系樹脂シートからなることを特徴
とする太陽電池用裏面保護シートでは、太陽電池用裏面
保護シートの寸法安定性、太陽電池用モジュール加工時
の寸法安定性、太陽電池の使用環境下発電性のいずれに
ついても◎〜△と、また実施例４の３μｍという薄いも
のでも○、△と、実用上十分な性能を有するのに対し、
比較例１では、実施例１、２と同様のエチレン−テトラ
フルオロエチレン共重合体で厚みが１００μｍと大きい
ものでは、加工時の寸法安定性こそ△であったが他は×
であり、比較例２のフッ化ビニルシートの厚さ３８μｍ
のものでは太陽電池用モジュール加工時の寸法安定性は
△だが他は×であり、実用上不十分なものであった。In the backsheet for solar cell according to the present invention shown in Examples 1 to 3, which is made of a fluororesin sheet having a thickness of 30 μm or less according to the present invention, the dimensional stability of the backsheet for a solar cell is improved.寸 法 to △ for the dimensional stability during processing of the solar cell module and the power generation under the usage environment of the solar cell, and △ and で も for the thin one of 3 μm in Example 4 showing satisfactory performance for practical use. While having
In Comparative Example 1, the same ethylene-tetrafluoroethylene copolymer as in Examples 1 and 2 having a thickness of 100 μm was as large as 100 μm.
And the thickness of the polyvinyl fluoride sheet of Comparative Example 2 was 38 μm.
The dimensional stability when processing the solar cell module was △, but the others were ×, which was insufficient for practical use.
【００２９】また、価格の上でも、本発明の厚さ３０μ
ｍ以下のフッ素系樹脂シートからなることを特徴とする
太陽電池用裏面保護シートでは、アルミ−フッ素複合シ
ートよりも５０〜９０％割安であった。Also, in terms of price, the thickness of the present invention is 30 μm.
m or less, the backsheet for solar cells characterized by being made of a fluorine-based resin sheet of 50 m or less was 50-90% cheaper than the aluminum-fluorine composite sheet.
【００３０】[0030]
【発明の効果】以上説明したように、本発明は、厚さ３
０μｍ以下のフッ素系樹脂シートからなることを特徴と
する太陽電池用裏面保護シートであるので、極めて寸歩
安定性に優れ、これを使用した太陽電池は、太陽電池用
裏面保護シートの寸法安定性、太陽電池用モジュール加
工時の寸法安定性、太陽電池の使用環境下発電性のいず
れにも優れ、安価にして寸法安定性の極めて高い太陽電
池用裏面保護シートを提供し、そして、この太陽電池用
裏面保護シートを用いた太陽電池や太陽電池モジュール
を提供するものである。As described above, the present invention has a thickness of 3
Since it is a backside protective sheet for a solar cell characterized by being made of a fluororesin sheet of 0 μm or less, the dimensional stability of the backside protective sheet for a solar cell using the solar cell is extremely excellent because of excellent dimensional stability. To provide a backsheet for solar cells, which is excellent in both dimensional stability during processing of solar cell modules and power generation under the usage environment of solar cells, is inexpensive, and has extremely high dimensional stability. It is intended to provide a solar cell and a solar cell module using the back surface protection sheet for use.
Claims (3)
からなることを特徴とする太陽電池用裏面保護シート。1. A backsheet for a solar cell, comprising a fluororesin sheet having a thickness of 30 μm or less.
脂がテトラフルオロエチレン−ビニリデンフルオリド共
重合体、ヘキサフルオロエチレン−ビニリデンフルオリ
ド共重合体、テトラフルオロエチレン−ヘキサフルオロ
エチレン−ビニリデンフルオリド共重合体のいずれかか
らなる請求項１記載の太陽電池用裏面保護シート。2. The fluororesin constituting the fluororesin sheet is tetrafluoroethylene-vinylidene fluoride copolymer, hexafluoroethylene-vinylidene fluoride copolymer, tetrafluoroethylene-hexafluoroethylene-vinylidene fluoride copolymer. The backsheet for solar cells according to claim 1, comprising a polymer.
面保護シートを用いた太陽電池及び太陽電池モジュー
ル。3. A solar cell and a solar cell module using the solar cell back protection sheet according to claim 1.
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|---|---|---|---|
| JP2002152753A JP2003347570A (en) | 2002-05-27 | 2002-05-27 | Protective sheet for back side of solar battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002152753A JP2003347570A (en) | 2002-05-27 | 2002-05-27 | Protective sheet for back side of solar battery |
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| Publication Number | Publication Date |
|---|---|
| JP2003347570A true JP2003347570A (en) | 2003-12-05 |
Family
ID=29770016
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2002152753A Pending JP2003347570A (en) | 2002-05-27 | 2002-05-27 | Protective sheet for back side of solar battery |
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| Country | Link |
|---|---|
| JP (1) | JP2003347570A (en) |
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