JPWO2005104242A1 - 太陽電池モジュールの製造方法 - Google Patents
太陽電池モジュールの製造方法 Download PDFInfo
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Abstract
Description
2 受光面側透明板
3 裏面板
4 太陽電池セル
5 樹脂
8 導線
9 間隙部
10 余白部
20 第1封止樹脂シート
30 第2封止樹脂シート
40〜46 封止樹脂シート片
50〜54 導線
55,56絶縁フィルム
60 積層体
61 袋
66 熱風炉
図4に太陽電池モジュール1の外形と、その中に配列された太陽電池セル4とを示す。太陽電池セル4として、100mm×100mm×0.3mmの正方形の単結晶シリコン太陽電池セルを416枚使用した。四隅は数mm程度面取りがされている。導線8としては、日立電線株式会社製のハンダディップ銅リボン線を使用した。当該リボン線の幅は1.5mmで厚さは0.15mmである。太陽電池セル4の受光面6と裏面7の導線8を接着する部分には予めハンダを印刷してある。導線8の一端を太陽電池セル4の受光面6のハンダ印刷部に重ねてハンダ付けし、他端を隣接する太陽電池セル4の裏面7のハンダ印刷部に重ねてハンダ付けした。隣接するセル間は2本の導線8で接続し、その間隔が2mmになるようにした。すなわち、間隙部9の幅は2mmである。
熱風炉66内の昇温を開始するとともに、封止処理容器内の減圧を開始した。45分かけて圧力を大気圧(0.1MPa)からゆっくりと0.07MPaまで低下させ、その間、温度を室温(30℃)からゆっくりと50℃まで上昇させた。
熱風炉66内の温度を30分間50℃に維持し、その間、封止処理容器内の圧力を0.07MPaから0.005MPa未満までゆっくりと減圧した。
熱風炉66内の温度を、50℃から60℃まで120分かけて昇温し、60℃から71℃(封止樹脂の融点)まで150分かけて昇温し、71℃で10分間維持してから、71℃から78℃まで45分かけて昇温した。この間、封止処理容器内の圧力を0.005MPa未満に維持した。
前記工程3において、熱風炉66内の温度が78℃になったところで昇圧を開始し、封止処理容器内の圧力を0.005MPa未満から0.07MPaまで70分かけてゆっくりと昇圧した。この間、温度は78℃から90℃まで75分かけてゆっくりと上昇させた。このときの昇温速度(℃/分)に対する昇圧速度(MPa/分)の比は、0.0063(MPa/℃)であった。この後、90℃で30分間維持し、30分かけて30℃まで冷却し、30℃で5分間維持し、その間0.07MPaの圧力を維持した。
引き続き、90分かけて30℃から155℃まで昇温し、155℃で36分間維持して架橋反応を進行させた。その間0.07MPaの圧力を維持した。
続いて、0.07MPaの圧力を維持しながら60分かけて155℃から30℃まで冷却し、30℃になったところで、約1分かけて封止処理容器内の圧力を0.1MPa(大気圧)まで上昇させ、熱風炉66から取り出した。
Claims (27)
- 受光面側透明板と裏面板との間に複数の太陽電池セルが樹脂で封止されてなる太陽電池モジュールの製造方法において、複数の太陽電池セルを5mm以下の間隔をあけて配列して相互に導線で接続し、受光面側透明板と太陽電池セルとの間に受光面側透明板の実質的に全面を覆う第1封止樹脂シートを配置し、裏面板と太陽電池セルとの間に裏面板の実質的に全面を覆う第2封止樹脂シートを配置し、太陽電池セルの外側の余白部に、その合計の厚みが太陽電池セルの厚みよりも厚い封止樹脂シート片を配置してから、受光面側透明板と裏面板との間の空気を排出し、加熱して樹脂を溶融させてから冷却して封止することを特徴とする太陽電池モジュールの製造方法。
- 前記封止樹脂シート片の合計の厚みが太陽電池セルの厚みと導線の厚みとの合計値よりも厚い請求項1記載の太陽電池モジュールの製造方法。
- 前記封止樹脂シート片の合計の厚みが太陽電池セルの厚みよりも0.3mm以上厚い請求項1又は2記載の太陽電池モジュールの製造方法。
- 前記封止樹脂シート片の合計の厚みが1〜5mmである請求項1〜3のいずれか記載の太陽電池モジュールの製造方法。
- 前記封止樹脂シート片が、第1封止樹脂シートと第2封止樹脂シートとの間に挟持される請求項1〜4のいずれか記載の太陽電池モジュールの製造方法。
- 前記余白部の全周にわたり実質的に連続して配置された封止樹脂シート片と、それと重ねられて相互に間隔をあけて配置された封止樹脂シート片とが、第1封止樹脂シートと第2封止樹脂シートとの間に挟持される請求項5記載の太陽電池モジュールの製造方法。
- 前記余白部において、全周にわたり実質的に連続して配置された封止樹脂シート片の内側の位置で、かつ太陽電池セルの外側の位置に、細幅の封止樹脂シート片を配置する請求項6記載の太陽電池モジュールの製造方法。
- 第1封止樹脂シート又は第2封止樹脂シートを、複数の封止樹脂シートを積層することによって構成する請求項1〜7のいずれか記載の太陽電池モジュールの製造方法。
- 前記余白部において、前記封止樹脂シート片が相互に間隔をあけて配置され、第1封止樹脂シート又は第2封止樹脂シートを構成する複数の封止樹脂シート相互の間に挟持される請求項8記載の太陽電池モジュールの製造方法。
- 受光面側透明板と裏面板のいずれもが、反りを有する表面圧縮応力が20MPa以上のガラス板からなり、その反りの凹面同士を向かい合わせて封止操作を行う請求項1〜9のいずれか記載の太陽電池モジュールの製造方法。
- 前記ガラス板の反り(JIS R3206に準拠して測定した値)が0.05〜0.5%である請求項10記載の太陽電池モジュールの製造方法。
- 受光面側透明板と裏面板との間に複数の太陽電池セルが樹脂で封止されてなる太陽電池モジュールの製造方法において、複数の太陽電池セルを間隔をあけて配列して相互に導線で接続し、受光面側透明板と太陽電池セルとの間に受光面側透明板の実質的に全面を覆う第1封止樹脂シートを配置し、裏面板と太陽電池セルとの間に裏面板の実質的に全面を覆う第2封止樹脂シートを配置し、第1封止樹脂シート又は第2封止樹脂シートを複数の封止樹脂シートを積層することによって構成し、電気配線の一部を太陽電池セルと接触することなく重なる位置に配置し、第1封止樹脂シート又は第2封止樹脂シート内において1枚の封止樹脂シートを前記電気配線の部分で欠落するように配置してから、受光面側透明板と裏面板との間の空気を排出し、加熱して樹脂を溶融させてから冷却して封止することを特徴とする太陽電池モジュールの製造方法。
- 前記電気配線の部分において封止樹脂シートが欠落した部分に、欠落した封止樹脂シートよりも薄い封止樹脂シートを補填する請求項12記載の太陽電池モジュールの製造方法。
- 前記電気配線と太陽電池セルとの間に絶縁フィルムを配置し、該絶縁フィルムが、太陽電池セル及び前記電気配線と、それぞれ封止樹脂シートを介して積層される請求項12又は13記載の太陽電池モジュールの製造方法。
- 封止処理容器内で封止するに際して、封止処理容器内の圧力を0.05MPa以上に保って封止樹脂を加熱する工程(工程1)、封止樹脂の融点未満の温度において封止処理容器内を0.01MPa以下の圧力まで減圧する工程(工程2)、減圧したままで封止樹脂の融点以上の温度まで昇温する工程(工程3)、前記封止処理容器内の圧力を上昇させる工程(工程4)及び冷却する工程(工程6)の各工程からなる封止操作を行う請求項1〜14のいずれか記載の太陽電池モジュールの製造方法。
- 受光面側透明板と裏面板との間に太陽電池セルが樹脂で封止されてなる太陽電池モジュールの製造方法において、受光面側透明板と太陽電池セルの間に受光面側透明板の実質的に全面を覆う第1封止樹脂シートを配置し、裏面板と太陽電池セルの間に裏面板の実質的に全面を覆う第2封止樹脂シートを配置してから、封止処理容器内に導入して、封止処理容器内の圧力を0.05MPa以上に保って封止樹脂を加熱する工程(工程1)、封止樹脂の融点未満の温度において封止処理容器内を0.01MPa以下の圧力まで減圧する工程(工程2)、減圧したままで封止樹脂の融点以上の温度まで昇温する工程(工程3)、前記封止処理容器内の圧力を上昇させる工程(工程4)及び冷却する工程(工程6)の各工程からなる封止操作を行うことを特徴とする太陽電池モジュールの製造方法。
- 工程1において封止処理容器内の温度が40〜65℃になるまで加熱し、その温度範囲で5分以上維持する請求項16記載の太陽電池モジュールの製造方法。
- 工程2において、封止処理容器内の温度を40〜65℃に維持しながら0.05MPaから0.01MPa以下まで減圧する請求項16又は17記載の太陽電池モジュールの製造方法。
- 工程2において、0.05MPaから0.01MPaまで5分以上かけて減圧する請求項16〜18のいずれか記載の太陽電池モジュールの製造方法。
- 工程4において、圧力を上昇させる際の温度が120℃以下である請求項16〜18のいずれか記載の太陽電池モジュールの製造方法。
- 工程4において、前記封止処理容器内の圧力を上昇させながら同時に昇温する請求項16〜20のいずれか記載の太陽電池モジュールの製造方法。
- 工程4において、昇温速度(℃/分)に対する昇圧速度(MPa/分)の比が0.001〜0.1(MPa/℃)である請求項16〜21のいずれか記載の太陽電池モジュールの製造方法。
- 前記封止樹脂が架橋可能な熱可塑性樹脂であり、減圧したままで封止樹脂の融点以上の温度まで昇温する工程(工程3)の後に、前記封止処理容器内の圧力を上昇させる工程(工程4)を経て、架橋反応が進行する温度範囲まで昇温して架橋反応を進行させる工程(工程5)及び冷却する工程(工程6)を有する請求項16〜22のいずれか記載の太陽電池モジュールの製造方法。
- 工程4で封止処理容器内の圧力を上昇させた後、一旦融点以下の温度まで冷却してから、工程5で架橋反応が進行する温度範囲まで昇温する請求項23記載の太陽電池モジュールの製造方法。
- 工程5において、前記封止処理容器内の圧力を0.05MPa以上かつ大気圧以下に保って架橋反応を進行させる請求項23又は24記載の太陽電池モジュールの製造方法。
- 前記太陽電池モジュールが、複数の太陽電池セルが樹脂で封止されてなる太陽電池モジュールであって、複数の太陽電池セルが間隔をあけて配列されて相互に導線で接続されてなる請求項16〜25のいずれか記載の太陽電池モジュールの製造方法。
- 前記封止樹脂が、エチレン−酢酸ビニル共重合体、ポリビニルブチラール及びポリウレタンからなる群から選択される一種の樹脂からなる請求項1〜26のいずれか記載の太陽電池モジュールの製造方法。
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