JP2019117860A - 両面受光型太陽電池モジュール - Google Patents
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Abstract
Description
所定のセル配列方向に沿って複数の太陽電池セルが前記配線によって電気的に接続されてなる両面受光型太陽電池モジュールを対象とする。この両面受光型太陽電池モジュールにあって、前記配線は、セル配列方向に沿って延びる断面円形状の導電材であり、前記セル配列方向に交差する方向に互いに並行する第1配線および第2配線を含み、前記配線用基材は透光性を有し、前記配線基板には前記第1配線と前記第2配線との間にいずれの配線も設けられず前記配線用基材が露出する透光部分が備えられ、前記太陽電池セルは、前記第1電極および前記第2電極のどちらも配設されていない受光領域が前記半導体基板の一方の面に設けられるとともに、前記太陽電池セルの前記受光領域の少なくとも一部に透光性固定樹脂が配設されていることを特徴としている。
実施形態1に係る両面受光型太陽電池モジュール(以下、単に太陽電池モジュールと称する。)は配線基板4を用いて電気的に接続された複数の裏面電極型の太陽電池セル2を備えた構成とされている。
本実施形態に係る太陽電池モジュール1では、このような配線41の接続形態を、配線基板4を用ることで実現している。図5に示すように、配線基板4は、配線用基材42上に複数の配線41が接着材43で固定されており、太陽電池セル2の配列方向に対応するMD方向(図5においては左右方向)に長く延びる形状を有している。並べられる複数の太陽電池セル2のn型用電極26およびp型用電極27は、配線41によって電気的に接続される。
本実施形態に係る裏面電極型の太陽電池セル2と配線基板4との固定方法について図9を参照しつつ説明する。図9は、太陽電池セル2と配線基板4との固定方法を示す断面説明図である。なお、ここでは、配線基板4上の第1配線411と第2配線412とを区別することなく配線41として説明する。
図2および図3に示したように、太陽電池モジュール1は、透光性基材81、封止樹脂83、太陽電池ストリング3、封止樹脂83、裏面側保護材82となるように重ねて配置され、加熱および加圧を行うことで封止される。加熱は、例えば160℃で行われる。このように重ねた状態で加熱することで、熱可塑性樹脂である封止樹脂83が軟化し、その後冷却されて硬化する。封止樹脂83が硬化する際に、太陽電池セル2の電極と配線基板4の配線41とが機械的に圧着されて、電気的な接続がより確実なものとなる。これにより、透光性基材81、太陽電池セル2、配線基板4、および裏面側保護材82が一体となった太陽電池モジュール1となされる。
図11は、実施形態2に係る太陽電池モジュール1を構成する太陽電池セル2の裏面側の平面図である。この実施形態に係る太陽電池モジュール1は、実施形態1に係る太陽電池モジュール1における太陽電池セル2と、電極パターンが異なっている。
図12は実施形態3に係る太陽電池モジュール1の概略断面図であり、図13は実施形態3に係る太陽電池モジュール1の他の例を示す概略断面図である。この実施形態に係る太陽電池モジュール1には、裏面側保護材82として透光性基材であるガラスが用いられている。
本発明に係る両面受光型太陽電池モジュールの実施例として、太陽電池モジュール1を構成する太陽電池セル2と配線基板4を次のように形成した。
2 太陽電池セル
21 シリコン基板
22 反射防止膜
23 n型不純物拡散領域
24 p型不純物拡散領域
25 パッシベーション膜
26 n型用電極(第1電極)
27 p型用電極(第2電極)
3 太陽電池ストリング
4 配線基板
41 配線
411 第1配線
412 第2配線
42 配線用基材
43 接着材
50 バスバー配線
81 透光性基材
82 裏面側保護材
83 封止樹脂
91 接合部材
92 固定樹脂
SL 太陽光
Claims (5)
- 半導体基板と、
前記半導体基板の一方の面に互いに異なる極性の第1電極および第2電極を備える複数の太陽電池セルと、
配線用基材の一方の面に複数の配線が固定された配線基板とを有しており、
所定のセル配列方向に沿って複数の太陽電池セルが前記配線によって電気的に接続されてなる両面受光型太陽電池モジュールであって、
前記配線は、セル配列方向に沿って延びる断面円形状の導電材であり、前記セル配列方向に交差する方向に互いに並行する第1配線および第2配線を含み、
前記配線用基材は透光性を有し、
前記配線基板には前記第1配線と前記第2配線との間にいずれの配線も設けられず前記配線用基材が露出する透光部分が備えられ、
前記太陽電池セルは、前記第1電極および前記第2電極のどちらも配設されていない受光領域が前記半導体基板の一方の面に設けられるとともに、前記太陽電池セルの前記受光領域と前記配線基板の前記透光部分との間の少なくとも一部分に透光性固定樹脂が配設されていることを特徴とする両面受光型太陽電池モジュール。 - 請求項1に記載の両面受光型太陽電池モジュールにおいて、
前記配線基板上に第1の太陽電池セルと第2の太陽電池セルとが隣接して配置されており、
前記第1配線が前記第1の太陽電池セルの前記第1電極および前記第2の太陽電池セルの前記第2電極に接続され、前記第2配線が前記第1の太陽電池セルの前記第2電極および前記第2の太陽電池セルの前記第1電極に接続されていることを特徴とする両面受光型太陽電池モジュール。 - 請求項2に記載の両面受光型太陽電池モジュールにおいて、
前記太陽電池セルの前記第1電極および前記第2電極は、前記太陽電池セルの一辺に沿った第1方向に直線状に配置されるとともに、前記第1方向に交差する第2方向に交互に並んで配置されており、
前記第1配線および前記第2配線は、前記第1電極および前記第2電極に対応して前記第1方向に延び、前記第1配線と前記第2配線とが前記第2方向に交互に配置されていることを特徴とする両面受光型太陽電池モジュール。 - 請求項1〜3のいずれか一つの請求項に記載の両面受光型太陽電池モジュールにおいて、
前記配線と、前記第1電極および前記第2電極とは、前記半導体基板の他方の面から投影された場合において、前記第1電極および前記第2電極の投影領域が、前記第1配線および前記第2配線の投影領域に含まれることを特徴とする両面受光型太陽電池モジュール。 - 請求項1〜4のいずれか一つの請求項に記載の両面受光型太陽電池モジュールにおいて、
前記太陽電池セルおよび前記配線基板は、前記半導体基板の一方の他方の面に第1の透光性封止材および透光性基材を順に備え、前記配線基板の他方の面に第2の透光性封止材および透光性の背面保護材を順に備えることを特徴とする両面受光型太陽電池モジュール。
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