JP2014036073A - Solar battery module - Google Patents

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JP2014036073A
JP2014036073A JP2012175610A JP2012175610A JP2014036073A JP 2014036073 A JP2014036073 A JP 2014036073A JP 2012175610 A JP2012175610 A JP 2012175610A JP 2012175610 A JP2012175610 A JP 2012175610A JP 2014036073 A JP2014036073 A JP 2014036073A
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sealing material
solar cell
foam
cell module
surface side
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Yoshiyuki Kobayashi
祥之 小林
Yoshiyuki Oka
善之 岡
Takashi Ando
隆 安藤
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Toray Industries Inc
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Toray Industries Inc
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

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Abstract

PROBLEM TO BE SOLVED: To provide a solar battery module at a low cost, the solar battery module being less in breakage of a solar battery cell under an outdoor environment.SOLUTION: A solar cell module includes a light receiving face protecting material, a light receiving face side sealing material, a solar battery cell, a rear face side sealing material and a rear face protecting material. The light receiving face side sealing material and/or the rear face side sealing material has a layer comprising a thermoplastic resin foam (the sealing material having a layer comprising a thermoplastic resin foam is here in after referred to as a foam-containing sealing material), and the Young's modulus of the foam-containing sealing material is in the range of 0.5-50 MPa.

Description

本発明は、太陽電池モジュールに関する。   The present invention relates to a solar cell module.

近年、資源の有効利用やCO排出量削減の観点から、太陽光を直接電気エネルギーに変換する太陽電池が注目され、技術開発が進められている。 In recent years, from the viewpoint of effective use of resources and reduction of CO 2 emissions, solar cells that directly convert sunlight into electrical energy have attracted attention and technical development has been promoted.

現在主流である結晶シリコン系太陽電池では、ガラスなどの受光面保護材、受光面側封止材、太陽電池セル、裏面側封止材、裏面保護材をこの順に積層し、該積層体を真空・加熱条件下でラミネートし、溶融した封止材樹脂で太陽電池セルを封止することで太陽電池モジュールが製造されている。   In crystalline silicon solar cells, which are currently mainstream, a light-receiving surface protective material such as glass, a light-receiving surface side sealing material, a solar cell, a back surface side sealing material, and a back surface protective material are stacked in this order, and the stacked body is vacuumed A solar battery module is manufactured by laminating under a heating condition and sealing the solar battery cell with a molten sealing material resin.

発電のため屋外環境下に設置される中、太陽電池モジュールは積雪などによる荷重や昼夜の温度変化などにより太陽電池セルの破損が起こることがある。さらに、太陽電池モジュールのさらなる低コスト化のために太陽電池セルの厚みがより薄くなっており、より薄い太陽電池セルを用いた場合、屋外環境下において太陽電池セルの破損がより起こりうるという問題点がある。   While being installed in an outdoor environment for power generation, the solar cell module may be damaged due to a load due to snow or the like, or a temperature change during the day and night. Furthermore, the thickness of the solar battery cell is thinner for further cost reduction of the solar battery module, and when the thinner solar battery cell is used, the solar battery cell is more likely to be damaged in the outdoor environment. There is a point.

上記問題を回避するために、特許文献1には、柔軟性の高いエチレン−酢酸ビニル共重合体(以下、「EVA」と記載することがある)を封止材として用いた太陽電池モジュールが開示されている。また、特許文献2には、柔軟性を持たせるため低密度のエチレン・α−オレフィン共重合体を封止材として用いた太陽電池モジュールが開示されている。   In order to avoid the above problem, Patent Document 1 discloses a solar cell module using a highly flexible ethylene-vinyl acetate copolymer (hereinafter sometimes referred to as “EVA”) as a sealing material. Has been. Patent Document 2 discloses a solar cell module using a low-density ethylene / α-olefin copolymer as a sealing material in order to provide flexibility.

特開昭58−60579号公報JP 58-60579 A 特開2012−25946号公報JP 2012-25946 A

しかしながら特許文献1の方法では、温度変化時の太陽電池セルの破損をより効果的に防ぐためには、封止材を厚くすることが必要となりコストアップにつながる問題があった。特許文献2の方法では低密度のエチレン・α−オレフィン共重合体は、EVAに対し原料コストが高いために太陽電池モジュールのコストアップにつながる問題があった。   However, in the method of Patent Document 1, in order to more effectively prevent damage to the solar battery cell at the time of temperature change, it is necessary to increase the thickness of the sealing material, leading to an increase in cost. In the method of Patent Document 2, the low-density ethylene / α-olefin copolymer has a problem that the cost of the solar cell module is increased because the raw material cost is higher than that of EVA.

上記のような従来技術の問題点に鑑み、本発明では屋外環境下での太陽電池セルの破損がより少ない太陽電池モジュールを低コストで提供することにある。   In view of the problems of the conventional technology as described above, it is an object of the present invention to provide a solar cell module with less damage to solar cells in an outdoor environment at low cost.

本発明者らは、上記目的を達成するため鋭意検討を行い、以下の構成を採ることで上記課題を解決できることを見出した。
(1)受光面保護材、受光面側封止材、太陽電池セル、裏面側封止材、及び裏面保護材を有する太陽電池モジュールであり、前記受光面側封止材及び/又は前記裏面側封止材が、熱可塑性樹脂発泡体からなる層を有し(以下、熱可塑性樹脂発泡体からなる層を有する封止材を、発泡体含有封止材という)、前記発泡体含有封止材のヤング率が0.5〜50MPaであることを特徴とする太陽電池モジュール。
(2)前記熱可塑性樹脂発泡体が、オレフィン系樹脂を含むことを特徴とする、(1)に記載の太陽電池モジュール。
(3)前記オレフィン系樹脂が、エチレン−酢酸ビニル共重合体及び/またはエチレン・α−オレフィン共重合体であることを特徴とする、(2)に記載の太陽電池モジュール。
(4)前記発泡体含有封止材の厚みが、200μm〜1000μmであることを特徴とする、(1)〜(3)のいずれかに記載の太陽電池モジュール。
(5)前記発泡体含有封止材の見かけ体積に対する空気の体積の比(空気の体積/発泡体含有封止材の見かけ体積)が、0.2〜0.6であることを特徴とする、(1)〜(4)のいずれかに記載の太陽電池モジュール。
The present inventors have intensively studied to achieve the above object, and have found that the above problem can be solved by adopting the following configuration.
(1) A solar cell module having a light receiving surface protective material, a light receiving surface side sealing material, a solar cell, a back surface side sealing material, and a back surface protective material, wherein the light receiving surface side sealing material and / or the back surface side. The sealing material has a layer made of a thermoplastic resin foam (hereinafter, the sealing material having a layer made of a thermoplastic resin foam is referred to as a foam-containing sealing material), and the foam-containing sealing material The Young's modulus of the solar cell module is 0.5 to 50 MPa.
(2) The solar cell module according to (1), wherein the thermoplastic resin foam contains an olefin resin.
(3) The solar cell module according to (2), wherein the olefin-based resin is an ethylene-vinyl acetate copolymer and / or an ethylene / α-olefin copolymer.
(4) The solar cell module according to any one of (1) to (3), wherein the foam-containing sealing material has a thickness of 200 μm to 1000 μm.
(5) The ratio of the volume of air to the apparent volume of the foam-containing sealing material (volume of air / apparent volume of the foam-containing sealing material) is 0.2 to 0.6. The solar cell module according to any one of (1) to (4).

本発明によれば、屋外環境下での太陽電池セルの破損がより少ない太陽電池モジュールを低コストで提供できる。   ADVANTAGE OF THE INVENTION According to this invention, the solar cell module with few damage of the photovoltaic cell in an outdoor environment can be provided at low cost.

太陽電池セルを受光面保護材、受光面側封止材、裏面側封止材、裏面保護材により挟み込んだ構造をした従来の太陽電池モジュールの一例の概略断面図である。It is a schematic sectional drawing of an example of the conventional solar cell module which has the structure where the photovoltaic cell was inserted | pinched with the light-receiving surface protection material, the light-receiving surface side sealing material, the back surface side sealing material, and the back surface protection material. 受光面側封止材が熱可塑性樹脂発泡体からなる層を有する封止材である本発明の太陽電池モジュールの一例の概略断面図である。It is a schematic sectional drawing of an example of the solar cell module of this invention which is a sealing material in which the light-receiving surface side sealing material has a layer which consists of a thermoplastic resin foam. 裏面側封止材が熱可塑性樹脂発泡体からなる層を有する封止材である本発明の太陽電池モジュールの一例の概略断面図である。It is a schematic sectional drawing of an example of the solar cell module of this invention which is a sealing material in which a back surface side sealing material has a layer which consists of a thermoplastic resin foam. 受光面側封止材および裏面側封止材が熱可塑性樹脂発泡体からなる層を有する封止材である本発明の太陽電池モジュールの一例の概略断面図である。It is a schematic sectional drawing of an example of the solar cell module of this invention which is a sealing material which has a layer which a light-receiving surface side sealing material and a back surface side sealing material consist of a thermoplastic resin foam.

以下本発明の太陽電池モジュールについて、図を用いて説明する。   Hereinafter, the solar cell module of the present invention will be described with reference to the drawings.

一般に太陽電池モジュールは、受光面保護材、受光面側封止材、太陽電池セル、裏面側封止材、及び裏面保護材を有する。より具体的には、図1に示すように、受光面保護材、受光面側封止材、太陽電池セル、裏面側封止材、及び裏面保護材をこの順に有することで、太陽電池セルを受光面保護材、受光面側封止材、裏面側封止材、裏面保護材により挟み込んだ構造である。   Generally, a solar cell module includes a light receiving surface protective material, a light receiving surface side sealing material, a solar battery cell, a back surface side sealing material, and a back surface protective material. More specifically, as shown in FIG. 1, by having a light receiving surface protective material, a light receiving surface side sealing material, a solar battery cell, a back surface side sealing material, and a back surface protective material in this order, The structure is sandwiched between a light receiving surface protective material, a light receiving surface side sealing material, a back surface side sealing material, and a back surface protective material.

本発明の太陽電池モジュールは、受光面側封止材及び/又は裏面側封止材に熱可塑性樹脂発泡体からなる層を有する。以下、熱可塑性樹脂発泡体からなる層を有する封止材を、発泡体含有封止材という。つまり、図2に示すように、受光面側封止材が発泡体含有封止材である太陽電池モジュールや、図3に示すように裏面側封止材が発泡体含有封止材である太陽電池モジュールや、図4に示すように受光面側封止材および裏面側封止材が発泡体含有封止材である太陽電池モジュールである。   The solar cell module of this invention has a layer which consists of a thermoplastic resin foam in a light-receiving surface side sealing material and / or a back surface side sealing material. Hereinafter, a sealing material having a layer made of a thermoplastic resin foam is referred to as a foam-containing sealing material. That is, as shown in FIG. 2, the solar cell module in which the light-receiving surface side sealing material is a foam-containing sealing material, or the back surface-side sealing material is a foam-containing sealing material as shown in FIG. As shown in FIG. 4, the battery module is a solar cell module in which the light-receiving surface side sealing material and the back surface side sealing material are foam-containing sealing materials.

発泡体含有封止材とは、太陽電池モジュールから該封止材層を取り出したとき、目視により該封止材中に気泡が1モジュール中に平均して25cmあたり100個以上確認することができる封止材のことである。 The foam-containing encapsulant means that when the encapsulant layer is taken out from the solar cell module, it is visually confirmed that 100 or more bubbles per 25 cm 2 are averaged in the encapsulant per module. It is a sealing material that can be used.

本発明の太陽電池モジュールにおける発泡体含有封止材は、熱可塑性樹脂発泡体からなる層単層のみでもよいし、図2〜図4に示すように、多層化されており一部のみ熱可塑性樹脂発泡体からなる層であってもよい。   The foam-containing sealing material in the solar cell module of the present invention may be only a single layer composed of a thermoplastic resin foam, or it is multilayered and partially thermoplastic as shown in FIGS. It may be a layer made of a resin foam.

本発明の太陽電池モジュールは、受光面側封止材及び/又は裏面側封止材は、熱可塑性樹脂発泡体からなる層を有することにより、太陽電池モジュールの製造が容易であり、耐衝撃性が良い。   In the solar cell module of the present invention, the light-receiving surface side sealing material and / or the back surface side sealing material has a layer made of a thermoplastic resin foam, so that the solar cell module can be easily manufactured and has impact resistance. Is good.

化学的な安定性の点で、熱可塑性樹脂発泡体からなる層を構成する熱可塑性樹脂は、オレフィン系樹脂を含むことが好ましい。オレフィン系樹脂とは、ポリプロピレンや、ポリシクロオレフィンやポリエチレンや、エチレン共重合体を指す。なかでも、耐衝撃性や耐候性の良さの点で、エチレン−酢酸ビニル共重合体及び/またはエチレン・α−オレフィン共重合体であることがより好ましい。   From the viewpoint of chemical stability, the thermoplastic resin constituting the layer made of the thermoplastic resin foam preferably contains an olefin resin. The olefin resin refers to polypropylene, polycycloolefin, polyethylene, or ethylene copolymer. Of these, ethylene-vinyl acetate copolymers and / or ethylene / α-olefin copolymers are more preferred from the viewpoint of impact resistance and good weather resistance.

発泡体含有封止材が多層化されている場合、非発泡体からなる層は、熱可塑性樹脂発泡体からなる層と同じ樹脂であってもよいし、異なる樹脂であってもよいが、ラミネート特性の良さの点から、非発泡体からなる層は熱可塑性樹脂であることが好ましい。また、前記熱可塑性樹脂には、封止特性向上のために必要に応じて架橋剤、架橋助剤、カップリング剤、紫外線吸収剤、光安定化剤、発泡剤などの添加剤が含有されていてもよい。   When the foam-containing sealing material is multi-layered, the non-foamed layer may be the same resin as the thermoplastic resin foam layer or a different resin. From the viewpoint of good characteristics, the layer made of non-foamed material is preferably a thermoplastic resin. In addition, the thermoplastic resin contains additives such as a crosslinking agent, a crosslinking aid, a coupling agent, an ultraviolet absorber, a light stabilizer, and a foaming agent as necessary for improving sealing properties. May be.

本発明の太陽電池モジュールにおける発泡体含有封止材のヤング率は、0.5MPa〜50MPaである。それによって積雪などによる荷重や昼夜の温度変化などにより太陽電池セルの破損を抑制することができる。積雪などによる荷重によって、太陽電池モジュールにはひずみ生じるが、前記のヤング率をもつ発泡体含有封止材で封止されていれば、太陽電池セルへと加わる応力が小さくすみ、太陽電池セルの破損を防ぐことができる。温度変化によって、受光面保護材と裏面保護材の伸び縮みの差により太陽電池モジュールにひずみが生じるが、これも前記のヤング率をもつ発泡体含有封止材で封止されていれば、太陽電池セルへと加わる応力が小さくすみ、太陽電池セルの破損を防ぐことができる。   The Young's modulus of the foam-containing sealing material in the solar cell module of the present invention is 0.5 MPa to 50 MPa. As a result, damage to the solar cells can be suppressed by a load due to snow or the like, or a temperature change during the day and night. Although the solar cell module is distorted by a load due to snow or the like, if it is sealed with the foam-containing encapsulant having the above Young's modulus, the stress applied to the solar cell is reduced, and the solar cell Damage can be prevented. Due to the temperature change, the solar cell module is distorted due to the difference in expansion and contraction between the light-receiving surface protective material and the back surface protective material, but if this is also sealed with the foam-containing sealing material having the above Young's modulus, The stress applied to the battery cell can be reduced, and damage to the solar battery cell can be prevented.

発泡体含有封止材のヤング率が0.5MPaより小さいと、荷重がかかった際の変形が大きすぎるために太陽電池モジュールからの封止材のはみ出しや、太陽電池セルの破損に繋がり、50MPaより大きいと、荷重による太陽電池セルの破損を抑制することができない。より効果的に太陽電池セルの破損を防ぐ点で、発泡体含有封止材のヤング率は0.5MPa〜15MPaであることがより好ましい。   If the Young's modulus of the foam-containing encapsulant is less than 0.5 MPa, the deformation when the load is applied is too large, leading to the protrusion of the encapsulant from the solar cell module and damage to the solar cell, 50 MPa If it is larger, damage to the solar battery cell due to the load cannot be suppressed. It is more preferable that the Young's modulus of the foam-containing sealing material is 0.5 MPa to 15 MPa in terms of more effectively preventing damage to the solar battery cell.

本発明の太陽電池モジュールにおける発泡体含有封止材の厚みは200μm〜1000μmが好ましく、200〜800μmがより好ましい。200μm未満であると小さな衝撃で太陽電池セルの破損が起こることがあり、1000μmより大きいと、太陽電池モジュールのコストが増大するために好ましくない。   200-1000 micrometers is preferable and, as for the thickness of the foam containing sealing material in the solar cell module of this invention, 200-800 micrometers is more preferable. If the thickness is less than 200 μm, the solar battery cell may be damaged by a small impact. If the thickness is more than 1000 μm, the cost of the solar battery module increases, which is not preferable.

本発明の太陽電池モジュールの発泡体含有封止材の見かけ体積に対する空気の体積の比(空気の体積/発泡体含有封止材の見かけ体積)が、0.2〜0.6であることが好ましい。0.2未満であると、発泡によるコスト低減効果が乏しく、0.6より大きいと太陽電池モジュールの温度が高温になった際の気泡の膨らみが大きいために太陽電池セルを破損してしまうことがあり、好ましくない。   The ratio of the volume of air to the apparent volume of the foam-containing encapsulant of the solar cell module of the present invention (air volume / apparent volume of the foam-containing encapsulant) is 0.2 to 0.6. preferable. If it is less than 0.2, the cost reduction effect due to foaming is poor, and if it is more than 0.6, the solar cell may be damaged due to the large expansion of bubbles when the temperature of the solar cell module becomes high. Is not preferable.

本発明の太陽電池モジュールの受光面保護材は公知のものであれば特に制限されないが、耐衝撃性や透明性の点でガラスであることが好ましい。また、裏面保護材や太陽電池セル、配線材などその他太陽電池モジュールに必要な部材は公知のものであれば特に制限されない。   The light-receiving surface protective material for the solar cell module of the present invention is not particularly limited as long as it is a known material, but is preferably glass in terms of impact resistance and transparency. Moreover, if it is a well-known thing, other members required for other solar cell modules, such as a back surface protection material, a photovoltaic cell, and a wiring material, will not be restrict | limited.

本発明の太陽電池モジュールは図2〜図4に示すように発泡体含有封止材が太陽電池モジュールの受光面側及び/または裏面側に存在する。発泡体含有封止材が受光面側にあっても散乱の効果により総発電能力の低減は見られず、また、裏面側であれば反射による総発電量の向上も見込まれる。   In the solar cell module of the present invention, the foam-containing sealing material is present on the light receiving surface side and / or the back surface side of the solar cell module as shown in FIGS. Even if the foam-containing sealing material is on the light-receiving surface side, the total power generation capacity is not reduced due to the scattering effect, and if it is on the back surface side, the total power generation amount is expected to be improved by reflection.

本発明の太陽電池モジュールは、真空ラミネーターによる加熱圧着など公知の方法によって製造される。本発明の太陽電池モジュールに用いられる発泡体含有封止材は公知の押出機などを用いて混練し、公知のTダイやカレンダーロールなどで成形される。本発明の太陽電池モジュールに用いられる発泡体含有封止材は加熱圧着の前時点で発泡しており加熱圧着の際に気泡がすべて消失せず太陽電池モジュールの製造工程が終了した時点で気泡が残存するようにしてもよいし、加熱圧着の前時点では発泡しておらず、含有する発泡剤の働きなどにより加熱圧着中に発泡することで太陽電池モジュールの製造工程が終了した時点で気泡が残存するようにしてもよい。気泡の制御の容易さの点で、加熱圧着の前時点では発泡しておらず、含有する発泡剤の働きなどにより加熱圧着中に発泡することで太陽電池モジュールの製造工程が終了した時点で気泡が残存するようにすることが好ましい。   The solar cell module of the present invention is manufactured by a known method such as thermocompression bonding using a vacuum laminator. The foam-containing sealing material used in the solar cell module of the present invention is kneaded using a known extruder or the like, and is molded using a known T die or calendar roll. The foam-containing encapsulant used for the solar cell module of the present invention is foamed before the thermocompression bonding, and all the bubbles are not lost during the thermocompression bonding, and the bubbles are formed when the manufacturing process of the solar cell module is completed. It may be allowed to remain, or it is not foamed at the time before thermocompression bonding, and bubbles are formed at the time when the manufacturing process of the solar cell module is completed by foaming during thermocompression bonding due to the function of the foaming agent contained. It may be allowed to remain. In terms of ease of control of bubbles, bubbles are not foamed at the time before thermocompression bonding, and bubbles are formed at the time when the manufacturing process of the solar cell module is completed by foaming during thermocompression bonding due to the action of the foaming agent contained. Is preferably left.

本発明を以下の実施例により更に詳しく説明するが、本発明は以下の実施例により何ら限定されるものではない。   The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to the following examples.

本実施例で用いた測定法を下記に示す。   The measurement method used in this example is shown below.

(1)ヤング率は太陽電池モジュールを切断し、発泡体含有封止材を太陽電池セルや受光面保護材や裏面保護材から剥離したものを用い、JISK7161(1994)にしたがい測定する。   (1) Young's modulus is measured according to JISK7161 (1994) using a solar cell module cut and a foam-containing sealing material peeled off from a solar cell, a light-receiving surface protective material or a back surface protective material.

(2)発泡体含有封止材の厚みは太陽電池モジュールを切断し、発泡体含有封止材を太陽電池セルや受光面保護材や裏面保護材から剥離したものを用い、発泡体含有封止材が表面保護材側封止材であれば、太陽電池セルと受光面保護材との間に存在した部分の厚み、発泡体含有封止材が裏面側封止材であれば、太陽電池セルと裏面保護材との間に存在した部分の厚みをミツトヨ社製デジタルシックネスゲージなど公知の厚み測定器によって測定したものをいう。   (2) The thickness of the foam-containing encapsulant is a foam-containing encapsulant that is obtained by cutting the solar cell module and peeling the foam-containing encapsulant from the solar cells, the light-receiving surface protective material, or the back surface protective material. If the material is a surface protective material side encapsulant, the thickness of the portion existing between the solar cell and the light receiving surface protective material, and if the foam-containing encapsulant is a back surface side encapsulant, the solar cell The thickness of a portion existing between the protective member and the back surface protective material is measured by a known thickness measuring instrument such as Mitutoyo Digital Thickness Gauge.

(3)見かけ体積に対する空気の体積の比(空気の体積/発泡体含有封止材の見かけ体積)は太陽電池モジュールを切断し、発泡体含有封止材を太陽電池セルや受光面保護材や裏面保護材から剥離したものを用い、質量と密度から含まれる空気の体積Aを求め、見かけの寸法から発泡体含有封止材の見かけ体積Bを求め、A/Bを計算した値をいう。   (3) The ratio of the air volume to the apparent volume (air volume / apparent volume of the foam-containing encapsulant) cuts the solar cell module, and the foam-containing encapsulant is used as a solar cell, a light-receiving surface protective material, A value obtained by calculating A / B by obtaining the volume A of air contained from the mass and density, obtaining the apparent volume B of the foam-containing encapsulant from the apparent dimensions, using the material peeled from the back surface protective material.

(4)荷重試験による太陽電池セルの破損の評価は、太陽電池モジュールに2400Paの荷重を10分間かけた後に目視およびEL画像検査装置にて太陽電池セルの破損を調べ、目視での太陽電池セルの破損が見られず、かつEL画像検査装置にて太陽電池セルの破損に由来する暗部がない状態をセル割れなしとした。   (4) Evaluation of the damage of the solar battery cell by the load test is carried out by applying a load of 2400 Pa to the solar battery module for 10 minutes, and then checking the damage of the solar battery cell visually and using an EL image inspection apparatus. In the EL image inspection apparatus, no cell cracking occurred when there was no dark part due to the damage of the solar battery cell.

(5)温度サイクル試験による太陽電池セルの破損の評価は、太陽電池モジュールをJISC8990(2009)に準拠した温度サイクル試験を100サイクル行った後に目視およびEL画像検査装置にて太陽電池セルの破損を調べ、目視での太陽電池セルの破損が見られず、かつEL画像検査装置にて太陽電池セルの破損に由来する暗部がない状態をセル割れなしとした。   (5) Evaluation of damage to solar cells by a temperature cycle test is carried out by conducting 100 cycles of a temperature cycle test in accordance with JISC 8990 (2009) on the solar cell module, and then checking the damage of the solar cells with the visual and EL image inspection devices. The state in which the solar battery cell was not visually damaged and no dark portion derived from the solar battery cell damage in the EL image inspection apparatus was determined as no cell cracking.

(実施例1)エチレン−1−ヘキセン共重合体樹脂(密度:0.898g/cm、メルトフローレイト:2g/10分(190℃))100質量部、発泡剤としてアゾジカルボンアミド5質量部、架橋剤として2,5−ジメチル−2,5−ジ(t−ブチルペルオキシ)ヘキサン1.1質量部、架橋助剤としてトリアリルイソシアヌレート2質量部、シランカップリング剤としてγ−メタクリロキシプロピルトリメトキシシラン1質量部、紫外線吸収剤として2−ヒドロキシ−4−オクチルベンゾフェノン0.5質量部を2軸押出機に供給して溶融混練し、Tダイから押出して厚み500μmの発泡性樹脂シートを得た。また、前記組成より発泡剤を除いた組成にて、同様に成膜することで厚み500μmの非発泡性樹脂シートを得た。非発泡性の樹脂シートを受光面側封止材として用い、発泡性樹脂シートを裏面側封止材として用い、厚さ3mmのガラス板よりなる受光面保護材、厚さ38μmのポリフッ化エチレンフィルムよりなる裏面保護材との間にシリコン発電素子よりなる太陽電池セルを封止した。なお、封止は、真空ラミネーターで温度150℃、脱気時間8分、プレス時間1分間、保持時間10分間にて加熱圧着し、樹脂を架橋することにより行った。その後、ガラス板からはみ出した樹脂を切除し、端面をブチルゴムおよびアルミフレームにて保護し、端子ボックスを接続し、端子ボックス内にシリコーン樹脂を充填することで太陽電池モジュールを製造した。このようにして作成した太陽電池モジュールは、荷重試験後の太陽電池セルの破損は確認されず、また温度サイクル試験後の太陽電池セルの破損も確認されなかった。太陽電池モジュールを切断して発泡体含有封止材を取り出したところ、ヤング率は14MPaであり、厚みは420μm、見かけ体積に対する空気の体積の比は0.45であった。 (Example 1) Ethylene-1-hexene copolymer resin (density: 0.898 g / cm 3 , melt flow rate: 2 g / 10 min (190 ° C.)) 100 parts by mass, azodicarbonamide 5 parts by mass as a foaming agent , 1.1 parts by mass of 2,5-dimethyl-2,5-di (t-butylperoxy) hexane as a crosslinking agent, 2 parts by mass of triallyl isocyanurate as a crosslinking aid, and γ-methacryloxypropyl as a silane coupling agent 1 part by mass of trimethoxysilane and 0.5 part by mass of 2-hydroxy-4-octylbenzophenone as an ultraviolet absorber are supplied to a twin screw extruder, melt-kneaded, and extruded from a T-die to form a foamable resin sheet having a thickness of 500 μm. Obtained. Moreover, the 500-micrometer-thick non-foamable resin sheet was obtained by forming into a film similarly with the composition except the foaming agent from the said composition. A non-foaming resin sheet is used as the light-receiving surface side sealing material, a foaming resin sheet is used as the back surface-side sealing material, a light-receiving surface protective material made of a 3 mm thick glass plate, and a 38 μm thick polyfluorinated ethylene film A solar battery cell made of a silicon power generation element was sealed between the back protective material made of the silicon power generation device. Sealing was performed by thermocompression bonding with a vacuum laminator at a temperature of 150 ° C., a degassing time of 8 minutes, a pressing time of 1 minute, and a holding time of 10 minutes to crosslink the resin. Thereafter, the resin protruding from the glass plate was cut off, the end face was protected with butyl rubber and an aluminum frame, a terminal box was connected, and a silicone resin was filled in the terminal box to produce a solar cell module. The solar cell module thus produced was not confirmed to be damaged by the solar cell after the load test, and was not confirmed to be damaged after the temperature cycle test. When the solar cell module was cut and the foam-containing sealing material was taken out, the Young's modulus was 14 MPa, the thickness was 420 μm, and the ratio of the air volume to the apparent volume was 0.45.

(実施例2)使用する樹脂をEVA樹脂(酢酸ビニル含有量:32質量%、メルトフローレイト:20g/10分(190℃))100質量部とした以外は実施例1と同様の方法で樹脂シートを作成し、太陽電池モジュールを作成した。作成した太陽電池モジュールは荷重試験後の太陽電池セルの破損は確認されず、また温度サイクル試験後の太陽電池セルの破損も確認されなかった。太陽電池モジュールを切断して発泡体含有封止材を取り出したところ、ヤング率は10MPaであり、厚みは440μm、見かけ体積に対する空気の体積の比は0.35であった。   (Example 2) Resin was prepared in the same manner as in Example 1 except that the resin used was 100 parts by mass of EVA resin (vinyl acetate content: 32% by mass, melt flow rate: 20 g / 10 min (190 ° C)). A sheet was created to create a solar cell module. The produced solar cell module was not confirmed to be damaged by the solar cell after the load test, and was not confirmed to be damaged after the temperature cycle test. When the solar cell module was cut and the foam-containing sealing material was taken out, the Young's modulus was 10 MPa, the thickness was 440 μm, and the ratio of the volume of air to the apparent volume was 0.35.

(比較例1)実施例1で作成した厚み500μmの非発泡性樹脂シートを受光面側封止材および裏面側封止材として用いた以外は実施例1と同様の方法で太陽電池モジュールを作成した。作成した太陽電池モジュールは荷重試験後の太陽電池セルの破損が確認され、また温度サイクル試験後の太陽電池セルの破損も確認された。太陽電池モジュールを切断して発泡体含有封止材を取り出したところ、ヤング率は52MPaであり、厚みは500μmであった。   (Comparative Example 1) A solar cell module was prepared in the same manner as in Example 1 except that the non-foamable resin sheet having a thickness of 500 µm prepared in Example 1 was used as the light-receiving surface side sealing material and the back surface side sealing material. did. The produced solar cell module was confirmed to be damaged by the solar cell after the load test, and was also confirmed to be damaged after the temperature cycle test. When the solar cell module was cut and the foam-containing sealing material was taken out, the Young's modulus was 52 MPa and the thickness was 500 μm.

(比較例2)使用する樹脂を低密度ポリエチレン(密度:0.92g/cm、メルトフローレイト:2g/10分(190℃))100質量部とした以外は実施例1と同様の方法で樹脂シートを作成し、太陽電池モジュールを作成した。作成した太陽電池モジュールは荷重試験後の太陽電池セルの破損が確認され、また温度サイクル試験後の太陽電池セルの破損も確認された。太陽電池モジュールを切断して発泡体含有封止材を取り出したところ、ヤング率は60MPaであり、厚みは440μm、見かけ体積に対する空気の体積の比は0.35であった。 (Comparative Example 2) The same method as in Example 1 was used except that the resin used was 100 parts by mass of low-density polyethylene (density: 0.92 g / cm 3 , melt flow rate: 2 g / 10 min (190 ° C.)). A resin sheet was created to create a solar cell module. The produced solar cell module was confirmed to be damaged by the solar cell after the load test, and was also confirmed to be damaged after the temperature cycle test. When the solar cell module was cut and the foam-containing encapsulant was taken out, the Young's modulus was 60 MPa, the thickness was 440 μm, and the ratio of the air volume to the apparent volume was 0.35.

1 受光面保護材
2 受光面側封止材
3 太陽電池セル
4 裏面側封止材
5 裏面保護材
6 アルミフレーム
7 端子ボックス
20 熱可塑性樹脂発泡体からなる層を有する受光面側封止材
21 熱可塑性樹脂発泡体からなる層
22 非発泡体からなる層
40 熱可塑性樹脂発泡体からなる層を有する裏面側封止材
DESCRIPTION OF SYMBOLS 1 Light-receiving surface protective material 2 Light-receiving surface side sealing material 3 Solar cell 4 Back surface side sealing material 5 Back surface protective material 6 Aluminum frame 7 Terminal box 20 Light-receiving surface side sealing material 21 which has the layer which consists of thermoplastic resin foams 21 Layer 22 made of thermoplastic resin foam 22 Layer made of non-foamed body 40 Back side sealing material having layer made of thermoplastic resin foam

Claims (5)

受光面保護材、受光面側封止材、太陽電池セル、裏面側封止材、及び裏面保護材を有する太陽電池モジュールであり、
前記受光面側封止材及び/又は前記裏面側封止材が、熱可塑性樹脂発泡体からなる層を有し(以下、熱可塑性樹脂発泡体からなる層を有する封止材を、発泡体含有封止材という)、
前記発泡体含有封止材のヤング率が0.5〜50MPaであることを特徴とする太陽電池モジュール。
It is a solar cell module having a light receiving surface protective material, a light receiving surface side sealing material, a solar battery cell, a back surface side sealing material, and a back surface protective material,
The light-receiving surface side sealing material and / or the back surface side sealing material has a layer made of a thermoplastic resin foam (hereinafter referred to as foam containing a sealing material having a layer made of a thermoplastic resin foam). Called sealing material),
The solar cell module, wherein the foam-containing sealing material has a Young's modulus of 0.5 to 50 MPa.
前記熱可塑性樹脂発泡体が、オレフィン系樹脂を含むことを特徴とする、請求項1に記載の太陽電池モジュール。   The solar cell module according to claim 1, wherein the thermoplastic resin foam contains an olefin resin. 前記オレフィン系樹脂が、エチレン−酢酸ビニル共重合体及び/またはエチレン・α−オレフィン共重合体であることを特徴とする、請求項2に記載の太陽電池モジュール。   The solar cell module according to claim 2, wherein the olefin-based resin is an ethylene-vinyl acetate copolymer and / or an ethylene / α-olefin copolymer. 前記発泡体含有封止材の厚みが、200μm〜1000μmであることを特徴とする、請求項1〜3のいずれかに記載の太陽電池モジュール。   The thickness of the said foam containing sealing material is 200 micrometers-1000 micrometers, The solar cell module in any one of Claims 1-3 characterized by the above-mentioned. 前記発泡体含有封止材の見かけ体積に対する空気の体積の比(空気の体積/発泡体含有封止材の見かけ体積)が、0.2〜0.6であることを特徴とする、請求項1〜4のいずれかに記載の太陽電池モジュール。   The ratio of the volume of air to the apparent volume of the foam-containing sealing material (air volume / apparent volume of the foam-containing sealing material) is 0.2 to 0.6. The solar cell module in any one of 1-4.
JP2012175610A 2012-08-08 2012-08-08 Solar battery module Pending JP2014036073A (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2019163779A1 (en) * 2018-02-21 2019-08-29 株式会社カネカ Solar cell module
CN111108610A (en) * 2017-09-19 2020-05-05 东洋铝株式会社 Solar cell module

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111108610A (en) * 2017-09-19 2020-05-05 东洋铝株式会社 Solar cell module
CN111108610B (en) * 2017-09-19 2023-07-25 东洋铝株式会社 Solar cell module
WO2019163779A1 (en) * 2018-02-21 2019-08-29 株式会社カネカ Solar cell module
JPWO2019163779A1 (en) * 2018-02-21 2021-02-04 株式会社カネカ Solar cell module
JP7349979B2 (en) 2018-02-21 2023-09-25 株式会社カネカ solar module

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