JP2023033081A - 太陽電池及び光起電力モジュール - Google Patents
太陽電池及び光起電力モジュール Download PDFInfo
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Abstract
【解決手段】太陽電池は、基板及び基板に位置するパッシベーション層と、基板の面に設けられたメイングリッド及びサブグリッドとを含み、メイングリッドとサブグリッドは電気的に接続され、サブグリッドは基板に電気的に接続され、メイングリッドの数は10~15本であり、太陽電池は基板の面に設けられた溶接点をさらに含み、溶接点の数は4~6個であり、溶接点は第1溶接点及び第2溶接点を含み、第1溶接点はメイングリッドの両端に位置し、第2溶接点は第1溶接点の間に位置し、第1溶接点の面積は0.6mm2~1.3mm2であり、第2溶接点の面積は0.2mm2~0.5mm2である。
【選択図】図1
Description
前記メイングリッドとサブグリッドが電気的に接続され、ここで、前記メイングリッドの数が10~15本であり、
前記溶接点の数が4~6個であり、前記溶接点が第1溶接点及び第2溶接点を含み、前記第1溶接点が前記メイングリッドの両端に位置し、前記第2溶接点が前記第1溶接点の間に位置し、前記第1溶接点の面積が0.6mm2~1.3mm2であり、前記第2溶接点の面積が0.2mm2~0.5mm2である。
前記第1溶接点及び/又は前記第2溶接点の前記太陽電池の厚さ方向に沿ったサイズは、8μm以下である。
on(Tunnel Oxide Passivated Contact、トンネル酸化物不動態化接触)電池であってもよく、TOPCon電池の基板はN型半導体であり、基板の裏側には順に超薄いトンネル酸化層、N型多結晶シリコン、裏面パッシベーション層及び金属電極が設けられ、他方側にはホウ素がドープされた拡散層及び金属電極が設けられる。
て、メイングリッド1及び/又はサブグリッド2の体積を減少させ、及び/又は第1溶接点31及び第2溶接点32の太陽電池の厚さ方向に沿ったサイズを減少させて、溶接点3の体積を減少させ、それによって銀ペースト原料を減少させ、製造コストを低下させることができる。
銀を用いて導電し、アルミニウムのコストが低いため、裏面にサブグリッド2の数を適切に増加させて、太陽電池の作動効率を向上させることが可能である。
であり、具体的には163電池で得た技術効果であり、比較例は、従来の一般的な技術案である。比較例1、比較例2及び実施形態1~実施形態5から分かるように、メイングリッド1の数が増加する場合、サブグリッド2の数が減少することができ、かつメイングリッド1の数が増加する場合、単一のメイングリッド1が収集する必要がある電流が減少するため、各メイングリッド1の幅を減少させることができるとともに、溶接ワイヤの直径を減少させることができ、したがって、溶接歩留まり及び必要な溶接引張力を確保しつつ、必要な溶接点3の数及び面積も相対的に減少し、コストを効果的に低減することができる。一般的には、溶接引張力の最小値が0.75Nよりも大きくすれば、プロセス要件を満たすことができ、表から分かるように、比較例1及び2に比べて、実施形態1~5は、銀ペーストの消費量を減少させ、コストを低減することができるとともに、依然として溶接引張力の要件を満たすこともでき、溶接歩留まりの変動が小さく、実際の使用要件を満たすことができる。それに、表中のデータからわかるように、比較例に比べて、実施形態は、コストを低減することができるとともに、電池効率及びモジュール効率を向上させることもでき、より実際の使用需要に合致する。
2-サブグリッド
3-溶接点
31-第1溶接点
32-第2溶接点
Claims (15)
- 太陽電池であって、
基板、及び前記基板の少なくとも一つの面に位置するパッシベーション層と、前記基板の面に互いに交差して設置されたメイングリッド(1)とサブグリッド(2)と、前記基板の面に設置された溶接点(3)とを含み、
前記メイングリッド(1)とサブグリッド(2)が電気的に接続され、前記メイングリッド(1)の数は、10~15本であり、
前記溶接点(3)の数は、4~6個であり、前記溶接点(3)は、第1溶接点(31)及び第2溶接点(32)を含み、前記第1溶接点は、前記メイングリッド(1)の両端に位置し、前記第2溶接点(32)は、前記第1溶接点(31)の間に位置し、
前記基板は、N型半導体であり、前記サブグリッド(2)の幅は、20μm~40μmであり、
あるいは、
前記基板は、P型半導体であり、前記サブグリッド(2)の幅は、20μm~45μmである、ことを特徴とする太陽電池。 - 前記第1溶接点(31)の面積は、0.6mm2~1.3mm2であり、前記第2溶接点(32)の面積は、0.2mm2~0.5mm2である、ことを特徴とする請求項1に記載の太陽電池。
- 前記メイングリッド(1)及び/又はサブグリッド(2)の前記太陽電池の厚さ方向に沿ったサイズは、10μm以下であり、及び/又は、
前記第1溶接点(31)及び/又は前記第2溶接点(32)の前記太陽電池の厚さ方向に沿ったサイズは、8μm以下である、ことを特徴とする請求項1に記載の太陽電池。 - 前記第1溶接点(31)及び/又は第2溶接点(32)の形状は、矩形、菱形、円形、楕円形のうちのいずれか一つまたはそれらの組み合わせを含む、ことを特徴とする請求項1に記載の太陽電池。
- 前記第1溶接点(31)の長さ及び幅は、それぞれ0.3mm~1.1mmである、ことを特徴とする請求項4に記載の太陽電池。
- 前記第2溶接点(32)の長さ及び幅は、それぞれ0.4mm~0.8mmである、ことを特徴とする請求項4に記載の太陽電池。
- 前記第2溶接点(32)は、前記メイングリッド(1)に接触しかつ前記サブグリッド(2)に接触しない、ことを特徴とする請求項1~6のいずれか一項に記載の太陽電池。
- 前記基板は、N型半導体であり、前記メイングリッド(1)の幅は、20μm~45μmである、ことを特徴とする請求項1に記載の太陽電池。
- 前記サブグリッド(2)の数は、80~100本である、ことを特徴とする請求項8に記載の太陽電池。
- 前記基板は、P型半導体であり、前記メイングリッド(1)の幅は、40μm~60μmである、ことを特徴とする請求項1に記載の太陽電池。
- 前記メイングリッド(1)の数は、10~13本である、ことを特徴とする請求項10に記載の太陽電池。
- 前記サブグリッド(2)の数は、100~150本である、ことを特徴とする請求項10に記載の太陽電池。
- 光起電力モジュールであって、
前記光起電力モジュールは、表面から裏面まで順にガラス、第1接着フィルム材料、太陽電池ストリング、第2接着フィルム材料、バックシートであり、
前記太陽電池ストリングは、複数の太陽電池から構成され、前記太陽電池は、請求項1~12のいずれか一項に記載の太陽電池である、ことを特徴とする光起電力モジュール。 - 前記太陽電池同士は、溶接ワイヤによって接続され、前記溶接ワイヤの直径は、0.25mm~0.32mmである、ことを特徴とする請求項13に記載の光起電力モジュール。
- 前記第1接着フィルム材料及び/又は前記第2接着フィルム材料の重量は、300g/m2~500g/m2である、ことを特徴とする請求項13に記載の光起電力モジュール。
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