JP2007273857A - Wiring member for solar cell connection and solar battery device using same - Google Patents

Wiring member for solar cell connection and solar battery device using same Download PDF

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JP2007273857A
JP2007273857A JP2006099476A JP2006099476A JP2007273857A JP 2007273857 A JP2007273857 A JP 2007273857A JP 2006099476 A JP2006099476 A JP 2006099476A JP 2006099476 A JP2006099476 A JP 2006099476A JP 2007273857 A JP2007273857 A JP 2007273857A
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wiring member
solar cell
solar
surface side
wire
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Teiji Tsuge
定司 津毛
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Sanyo Electric Co Ltd
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Sanyo Electric Co Ltd
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    • 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

Abstract

<P>PROBLEM TO BE SOLVED: To provide a wiring member for solar cell connection whose wire width is made thin without increasing a resistance loss, which is easy for bending work. <P>SOLUTION: The wiring member electrically connects a front surface side electrode of a solar battery element and a rear surface side electrode of an adjacent solar battery element, wherein the member connected at least with the front surface side electrode of a solar cell is formed into a wire section 10 whose cross-sectional shape is circular, and the part located at least at the gap between the solar battery elements is rolled such that a flat portion 11 is formed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

この発明は、太陽電池素子の表面側電極と隣接する太陽電池素子の裏面側電極とを電気的に接続する太陽電池セル接続用配線部材並びにこの配線部材を用いた太陽電池装置に関する。   The present invention relates to a solar cell connection wiring member that electrically connects a front surface side electrode of a solar cell element and a back surface side electrode of an adjacent solar cell element, and a solar cell device using the wiring member.

太陽電池は、クリーンで無尽蔵のエネルギー源である太陽からの光を直接電気変換できることから地球環境の観点から注目されている。   Solar cells are attracting attention from the viewpoint of the global environment because they can directly convert light from the sun, which is a clean and inexhaustible energy source.

斯かる太陽電池を家庭用或いはビル等の電源として用いるにあたっては、太陽電池セル１個あたりの出力が精々数Ｗ程度として小さいことから、通常複数の太陽電池セルを直列に接続することで、出力を数１００Ｗにまで高めた太陽電池モジュールとして使用されている。   When such a solar cell is used as a power source for home use or a building, since the output per solar cell is as small as about several watts, the output is usually obtained by connecting a plurality of solar cells in series. Is used as a solar cell module that has been increased to several hundred watts.

従来太陽電池モジュールとしては、太陽電池セルが表面の電極と裏面の電極に対して、表面に半田がコーティングされた銅箔等からなる細長いテープ状のタブリードを用いて接続される。タブリードの前半部分は太陽電池セルの表面に沿って半田付けされ、タブリードは太陽電池セル間で折り曲げられ、タブリードの後半部分は、隣接する太陽電池セルの裏面に沿って半田付けされる。   As a conventional solar cell module, a solar cell is connected to an electrode on the front surface and an electrode on the back surface by using an elongated tape-like tab lead made of copper foil or the like whose surface is coated with solder. The first half of the tab lead is soldered along the surface of the solar cell, the tab lead is bent between the solar cells, and the second half of the tab lead is soldered along the back surface of the adjacent solar cell.

ところで、太陽電池セルを高効率化するためには、発生する光電流をできるだけ多くして、その電流を損失することなく多く取り出すことが重要である。発生する光電流を多くするためには、電極など受光面を遮る面積をできるだけ少なくする方がよい。一方、発生した電流を損失なく外部へできるだけ多く取り出すためには、電極、タブリードなどの抵抗による損失を小さくする方がよい。このため、上記したタブリードは抵抗損失を下げるためにある程度の断面積を必要としている。従来は、このタブリードとしては、例えば、２００μｍの厚みで幅が２ｍｍのものが用いられている。   By the way, in order to increase the efficiency of the solar battery cell, it is important to increase the generated photocurrent as much as possible and extract the current without losing it. In order to increase the generated photocurrent, it is preferable to reduce the area that blocks the light receiving surface such as an electrode as much as possible. On the other hand, in order to extract as much of the generated current as possible to the outside without loss, it is better to reduce the loss due to resistance of electrodes, tab leads, and the like. For this reason, the tab lead described above requires a certain cross-sectional area in order to reduce the resistance loss. Conventionally, as this tab lead, for example, one having a thickness of 200 μm and a width of 2 mm is used.

受光面を遮る面積を少なくするためには、タブリードの線幅を細くし、その分高さ（厚み）を高く（厚く）した線材を使用することが考えられる。上記したように、太陽電池セルの間でタブリードを折り曲げて、表面側の電極から隣の太陽電池セルの裏面側電極へタブリードを案内する必要がある。しかしながら、高さ（厚み）のある線材の場合には、折り曲げ領域を小さくして折り曲げるのは難しく、セル間の間隙を広くとる必要があり、太陽電池モジュール全体としては、発電無効部分が増加することななる。また、線材に加わるストレスにより、太陽電池セルの破損が生じることがあった。   In order to reduce the area that blocks the light receiving surface, it is conceivable to use a wire rod in which the line width of the tab lead is reduced and the height (thickness) is increased (thickened) accordingly. As described above, it is necessary to bend the tab lead between the solar cells and guide the tab lead from the surface side electrode to the back side electrode of the adjacent solar cell. However, in the case of a wire having a height (thickness), it is difficult to bend it by making the folding region small, and it is necessary to widen the gap between cells, and the power generation invalid portion increases as the whole solar cell module. It will be. In addition, the solar cell may be damaged by the stress applied to the wire.

また、接続用のタブリードの断面形状を台形または三角形または略半円形または略半楕円形にしたものが提案されている（特許文献１参照）。
特開２００５−１５９１７３号公報 In addition, a connection tab lead having a trapezoidal shape, a triangular shape, a substantially semicircular shape, or a substantially semielliptical shape has been proposed (see Patent Document 1).
JP 2005-159173 A

上記した特許文献１に記載のものは、フィレットにマイクロクラックが発生し、接続部の電気抵抗の上昇することを防止することを目的としており、接続タブリードの断面形状は全て同じ形状に形成されている。このため抵抗損失を少なくするために高さを高く（厚く）すると、折り曲げが困難になり、この折り曲げに起因するストレスにより、太陽電池セルの破損が生じるなどの問題が発生する。   The one described in Patent Document 1 described above is intended to prevent the occurrence of micro cracks in the fillet and increase in the electrical resistance of the connection portion, and the cross-sectional shapes of the connection tab leads are all formed in the same shape. Yes. For this reason, if the height is increased (thickened) in order to reduce the resistance loss, it becomes difficult to bend, and problems such as damage to the solar battery cells occur due to the stress caused by the bending.

そこで、この発明は、抵抗損失を大きくすることなく線幅を細くし、且つ折り曲げ加工も容易な太陽電池セル接続用配線部材を提供することを目的とする。   In view of the above, an object of the present invention is to provide a solar cell connection wiring member that has a narrow line width and is easy to bend without increasing resistance loss.

この発明は、太陽電池素子の表面側電極と隣接する太陽電池素子の裏面側電極とを電気的に接続する配線部材において、太陽電池素子間の間隙部に位置する箇所は少なくとも扁平部を有し、太陽電池セルの表面側電極上に接続される部分は少なくとも前記扁平部より厚みを有し且つその幅が扁平部より狭く形成されていることを特徴とする。   The present invention provides a wiring member that electrically connects a front surface side electrode of a solar cell element and a back surface side electrode of an adjacent solar cell element, and a portion located in a gap between the solar cell elements has at least a flat portion. The portion connected to the surface side electrode of the solar battery cell is characterized in that it is at least thicker than the flat portion and its width is narrower than that of the flat portion.

また、前記表面側電極上に接続される部分はワイヤで構成すればよい。また、前記配線部材の隣接する太陽素子の裏面側電極上と接続する部分は扁平部で構成してもよく、前記配線部材の隣接する太陽素子の裏面側電極上と接続する部分はワイヤで構成してもよい。   Moreover, what is necessary is just to comprise the part connected on the said surface side electrode with a wire. Further, the portion connected to the back surface side electrode of the adjacent solar element of the wiring member may be configured by a flat portion, and the portion connected to the back surface side electrode of the adjacent solar element of the wiring member is configured of a wire. May be.

また、前記扁平部は前記ワイヤの直径の半分の厚みに形成するとよい。また、前記扁平部は、太陽電池セル間の間隙部少し大きく形成するとよい。   The flat portion may be formed to a thickness that is half the diameter of the wire. The flat portion may be formed slightly larger in the gap between the solar cells.

また、この発明の太陽電池装置は、上記に記載の太陽電池セル接続用配線部材を介して太陽電池セル同士を電気的に接続したことを特徴とする。   Moreover, the solar cell device of the present invention is characterized in that solar cells are electrically connected to each other through the solar cell connecting wiring member described above.

この発明は、太陽電池セルの表面部の電極と接続される部分を扁平部より厚みを厚く且つその幅を狭く形成された部材で構成しているので、投影面積が少なく且つ抵抗も小さくできる。また、少なくとも折り曲げ加工されるフォーミング箇所を含み、光を吸収する有効面積に関係ない箇所には、厚みが薄い扁平部に形成されているので、折り曲げ加工が容易に行える。   According to the present invention, the portion connected to the electrode on the surface portion of the solar battery cell is formed of a member formed thicker than the flat portion and narrower in width, so that the projected area can be reduced and the resistance can be reduced. In addition, since the thin portion is formed at a portion that includes at least the forming portion to be bent and is not related to the effective area for absorbing light, the bending can be easily performed.

この発明の実施の形態について図面を参照しながら詳細に説明する。なお、図中同一または相当部分には同一符号を付し、説明の重複を避けるためにその説明は繰返さない。   Embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the description thereof will not be repeated in order to avoid duplication of description.

図１は、この発明の実施形態にかかる太陽電池セル接続用配線部材を示す斜視図である。図１に示すように、この発明の太陽電池セル接続用配線部材１は、断面形状が円形のワイヤ部１０とワイヤを圧延して形成された扁平部１０とで構成される。ワイヤ部１０は、太陽電池セルの表面側（光入射側）の電極に接続される部分を構成し、扁平部１１は、少なくとも太陽電池セル間で折り曲げられるフォーミング部分を構成する。この実施形態おいては、太陽電池セルの表面側に接続される部分以外は扁平部１１になるように、ワイヤを圧延処理して形成されている。この実施形態においては、図２に示すような直径０．５ｍｍの銅（Ｃｕ）ワイヤ１０が用いられ、このワイヤ１０を圧延機を用いて薄扁平状の扁平部１１を形成している。この扁平部１１は、厚みを２００μｍ〜３００μｍ、幅が０．５ｍｍから２ｍｍになるように圧延して形成するのが好ましい。厚み２５０μｍ、幅２ｍｍの扁平部１１を形成した。この圧延機としては、例えば、株式会社大東製作所の小型圧延機（ＤＢＲ５０Ｓ型）などを用いればよい。   FIG. 1 is a perspective view showing a solar cell connection wiring member according to an embodiment of the present invention. As shown in FIG. 1, the photovoltaic cell connecting wiring member 1 according to the present invention includes a wire portion 10 having a circular cross section and a flat portion 10 formed by rolling a wire. The wire part 10 comprises the part connected to the electrode of the surface side (light incident side) of a photovoltaic cell, and the flat part 11 comprises the forming part bent at least between photovoltaic cells. In this embodiment, the wire is rolled to form the flat portion 11 except for the portion connected to the surface side of the solar battery cell. In this embodiment, a copper (Cu) wire 10 having a diameter of 0.5 mm as shown in FIG. 2 is used, and a thin flat portion 11 is formed using the wire 10 using a rolling mill. The flat portion 11 is preferably formed by rolling so as to have a thickness of 200 μm to 300 μm and a width of 0.5 mm to 2 mm. A flat portion 11 having a thickness of 250 μm and a width of 2 mm was formed. As this rolling mill, for example, a small rolling mill (DBR50S type) manufactured by Daito Manufacturing Co., Ltd. may be used.

尚、ワイヤ線材は銅に限らず、銀、アルミニウムなどを用いることも可能である。   Note that the wire material is not limited to copper, and silver, aluminum, or the like can also be used.

直径０．５ｍｍの銅線材からなるワイヤ１０であれば、２ｍｍ幅、２００μｍの厚みの銅箔からなる接続タブと同程度の抵抗値である。また、扁平部１１は、２５０μｍの厚さに圧延されているので、従来の接続タブと同じように容易に折り曲げ加工が行える。   In the case of the wire 10 made of a copper wire having a diameter of 0.5 mm, the resistance value is comparable to that of a connection tab made of a copper foil having a width of 2 mm and a thickness of 200 μm. Further, since the flat portion 11 is rolled to a thickness of 250 μm, it can be bent easily as in the conventional connection tab.

この発明の太陽電池セル接続配線部材１は、太陽電池セルの表面側は、断面形状が円形のワイヤ部１０で構成されているので、投影面積が少なく且つ抵抗も従来の接続タブより小さくできる。また、少なくとも折り曲げ加工されるフォーミング箇所を含み、光を吸収する有効面積に関係ないまたは影響の少ない箇所に対応する部分は、ワイヤを圧延して扁平部１１に形成されているので、折り曲げ加工が容易に行える。そして、折り曲げに伴うセルの割れ防止できると共に、セル間距離を大きく形成しなくても十分な折り曲げ加工が行える。   Since the solar cell connecting wiring member 1 of the present invention is configured by the wire portion 10 having a circular cross section on the surface side of the solar cell, the projected area is small and the resistance can be made smaller than that of the conventional connection tab. In addition, since the portion corresponding to the portion that includes at least the forming portion to be bent and does not relate to the effective area that absorbs light or has little influence is formed in the flat portion 11 by rolling the wire, the bending processing is performed. Easy to do. In addition, the cells can be prevented from cracking due to bending, and sufficient bending can be performed without forming a large inter-cell distance.

上記の太陽電池セル接続配線部材１に用いるワイヤの直径は０．５ｍｍのものに限られず、必要とする抵抗値に応じた大きさを選べばよい。また、圧延加工により、折り曲げ加工が容易な厚さに扁平部１１を形成すればよい。   The diameter of the wire used for the solar cell connection wiring member 1 is not limited to 0.5 mm, and a size corresponding to the required resistance value may be selected. Moreover, what is necessary is just to form the flat part 11 in the thickness which is easy to bend by rolling.

この太陽電池セル接続配線部材１の表面には、半田コートをあらかじめ施していても良い。半田コートは、半田槽に太陽電池セル接続配線部材１をディップする方法や半田メッキなどにより行えばよい。   A solder coat may be applied in advance to the surface of the solar cell connection wiring member 1. The solder coating may be performed by a method of dipping the solar cell connection wiring member 1 in a solder tank, solder plating, or the like.

図１に示した太陽電池セル接続配線部材１は、太陽電池セルの表面側の電極に接続される部分をワイヤ部１０で形成し、他の部分は扁平部１１に形成したが、これに限らず、図３に示すように、折り曲げ部分だけ扁平部１１を形成し、太陽電池セルの電極と接続される部分はワイヤ部１１で構成してもよい。   In the solar cell connection wiring member 1 shown in FIG. 1, the portion connected to the electrode on the surface side of the solar cell is formed by the wire portion 10, and the other portion is formed by the flat portion 11. Instead, as shown in FIG. 3, the flat part 11 may be formed only at the bent part, and the part connected to the electrode of the solar battery cell may be constituted by the wire part 11.

次に、上記した太陽電池セル接続配線部材１を用いて、太陽電池セルを電気的に接続したものにつき説明する。   Next, what connected the photovoltaic cell electrically using the above-mentioned photovoltaic cell connection wiring member 1 is demonstrated.

図４は、この実施形態に用いられる太陽電池セルを示す概略断面図である。尚、図４においては、各層の構成を理解し易くするために、実際の膜厚に沿った比率では記載せずに、薄膜層部分は拡大して表示している。   FIG. 4 is a schematic sectional view showing a solar battery cell used in this embodiment. In FIG. 4, in order to facilitate understanding of the configuration of each layer, the thin film layer portion is enlarged and displayed without being shown in the ratio along the actual film thickness.

図４に示すように、この太陽電池セル２は、結晶系半導体基板として、約３００μｍの厚みとを有するとともに、（１００）面を有するｎ型単結晶シリコン（ｃ−Ｓｉ）基板２１（以下、ｎ型単結晶シリコン基板２１という）を備えている。ｎ型単結晶シリコン基板２１の表面には、図示はしていないが、数μｍから数十μｍの高さを有する光閉じ込めのためのピラミッド状凹凸が形成されている。このｎ型単結晶シリコン基板２１上には、水素を含有する実質的に真性な非晶質半導体薄膜層として、３ｎｍ〜２５０ｎｍの厚みを有する実質的に真性のｉ型非晶質シリコン（ａ−Ｓｉ：Ｈ）層２２が形成されている。また、ｉ型非晶質シリコン層２２上には、水素を含有する荷電子制御された非晶質半導体薄膜層として、約５ｎｍの厚みを有するｐ型非晶質シリコン層２３が形成されている。   As shown in FIG. 4, this solar cell 2 has a thickness of about 300 μm as a crystalline semiconductor substrate and an n-type single crystal silicon (c-Si) substrate 21 (hereinafter referred to as “100” plane). n-type single crystal silicon substrate 21). On the surface of the n-type single crystal silicon substrate 21, although not shown, pyramidal irregularities having a height of several μm to several tens of μm are formed. On this n-type single crystal silicon substrate 21, a substantially intrinsic i-type amorphous silicon (a−) having a thickness of 3 nm to 250 nm as a substantially intrinsic amorphous semiconductor thin film layer containing hydrogen. A Si: H) layer 22 is formed. Further, a p-type amorphous silicon layer 23 having a thickness of about 5 nm is formed on the i-type amorphous silicon layer 22 as a hydrogen-containing valence-controlled amorphous semiconductor thin film layer. .

そして、ｐ型非晶質シリコン層２３上には、約１００ｎｍの厚みを有する酸化物透明導電膜として、この実施形態では、ＩＴＯ（Indium tin Oxide）膜２４が形成されている。   In this embodiment, an ITO (Indium Tin Oxide) film 24 is formed on the p-type amorphous silicon layer 23 as an oxide transparent conductive film having a thickness of about 100 nm.

このＩＴＯ膜２４の上面の所定領域には銀ペーストからなる櫛形状の集電極２５が形成されている。この集電極２５は、バスバー部とフィンガー部で形成されている。そして、バスバー部にこの発明の太陽電池セル接続配線部材１のワイヤ部１０が接続される。   A comb-shaped collecting electrode 25 made of silver paste is formed in a predetermined region on the upper surface of the ITO film 24. The collector electrode 25 is formed of a bus bar portion and finger portions. And the wire part 10 of the photovoltaic cell connection wiring member 1 of this invention is connected to a bus-bar part.

また、ｎ型単結晶シリコン基板２１の下面上には、約５ｎｍの厚みを有する実質的に真性のｉ型非晶質シリコン層２６が形成されている。ｉ型非晶質シリコン層２６の下面上には、約２０ｎｍの厚みを有するｎ型非晶質シリコン層２７が形成されている。このようにｎ型単結晶シリコン基板２１の下面上に、ｉ型非晶質シリコン層２６およびｎ型非晶質シリコン層２７が順番に形成されることにより、いわゆるＢＳＦ（Ｂａｃｋ Ｓｕｒｆａｃｅ Ｆｉｅｌｄ）構造が形成されている。更に、ｎ型非晶質シリコン層２７上には、約１００ｎｍの厚みを有する酸化物透明導電膜として、この実施形態ではＩＴＯ膜２８が形成されている。   A substantially intrinsic i-type amorphous silicon layer 26 having a thickness of about 5 nm is formed on the lower surface of the n-type single crystal silicon substrate 21. On the lower surface of the i-type amorphous silicon layer 26, an n-type amorphous silicon layer 27 having a thickness of about 20 nm is formed. As described above, the i-type amorphous silicon layer 26 and the n-type amorphous silicon layer 27 are sequentially formed on the lower surface of the n-type single crystal silicon substrate 21, thereby forming a so-called BSF (Back Surface Field) structure. Is formed. Further, an ITO film 28 is formed on the n-type amorphous silicon layer 27 as an oxide transparent conductive film having a thickness of about 100 nm in this embodiment.

このＩＴＯ膜２８上の所定領域には、同様に、銀ペーストからなる集電極２９が形成されている。この集電極２９のバスバー上にこの発明の太陽電池セル接続配線部材１の扁平部１１が接続される。   Similarly, a collector electrode 29 made of silver paste is formed in a predetermined region on the ITO film 28. The flat portion 11 of the solar cell connection wiring member 1 of the present invention is connected to the bus bar of the collector electrode 29.

太陽電池モジュールを構成するために、図５及び図６に示すように、複数の太陽電池セル２…がこの発明の太陽電池セル接続配線部材１を用いて直列に接続され、ストリングスが構成される。尚、図６は、図１に示す太陽電池セル接続配線部材１を用いた場合の図である。   In order to constitute the solar cell module, as shown in FIG. 5 and FIG. 6, a plurality of solar cells 2... Are connected in series using the solar cell connection wiring member 1 of the present invention, thereby forming a string. . In addition, FIG. 6 is a figure at the time of using the photovoltaic cell connection wiring member 1 shown in FIG.

これら複数の太陽電池セル２の各々は互いに隣接する他の太陽電池セル２と太陽電池セル接続配線部材１を介して直列に接続されている。即ち、太陽電池セル接続配線部材１の一方端側のワイヤ部１０が所定の太陽電池セル２の上面側の集電極２５に接続される。太陽電池セル２、２間で扁平部１１が折り曲げられるとともに、他方端側の扁平部１１がその所定の太陽電池セル２に隣接する別の太陽電池素子２の下面側の集電極２９に接続される。このように、複数の太陽電池セル２が互いに太陽電池セル接続配線部材１により電気的に接続される。   Each of the plurality of solar cells 2 is connected in series via another solar cell 2 adjacent to each other and the solar cell connection wiring member 1. That is, the wire portion 10 on one end side of the solar cell connection wiring member 1 is connected to the collector electrode 25 on the upper surface side of the predetermined solar cell 2. The flat portion 11 is bent between the solar cells 2 and 2, and the flat portion 11 on the other end side is connected to the collector electrode 29 on the lower surface side of another solar cell element 2 adjacent to the predetermined solar cell 2. The In this way, the plurality of solar cells 2 are electrically connected to each other by the solar cell connection wiring member 1.

太陽電池セル接続配線部材１と集電極２５、２９との接続は、図７の拡大断面図に示すように、鉛フリー半田１５、１５により、ワイヤ部１０と扁平部１１がそれぞれ接続される。半田付けは、例えば、熱風を吹き付け、半田を溶融させて接続させる。   As shown in the enlarged sectional view of FIG. 7, the wire portion 10 and the flat portion 11 are connected to the solar cell connection wiring member 1 and the collector electrodes 25 and 29 by lead-free solders 15 and 15, respectively. For soldering, for example, hot air is blown to melt and connect the solder.

次に、太陽電池セル端部と太陽電池セル接続配線部材１の扁平部１１との位置関係につき説明する。図８は、太陽電池セルとこの発明の太陽電池セル接続配線部材１とを接続した状態を示す平面図である。太陽電池セル２、２間は、１ｍｍから２ｍｍ程度の間隙（Ａ）が設けられている。この間隙（Ａ）で扁平部１１が折り曲げられ、太陽電池セル２の裏面側へ案内される。太陽電池セル２の端面と太陽電池セル接続配線部材１の扁平部１１とワイヤ部１０との境界部間の距離（Ｂ）は、以下のように設定すればよい。   Next, the positional relationship between the end portion of the solar cell and the flat portion 11 of the solar cell connection wiring member 1 will be described. FIG. 8 is a plan view showing a state in which the solar cells and the solar cell connection wiring member 1 of the present invention are connected. A gap (A) of about 1 mm to 2 mm is provided between the solar cells 2 and 2. The flat portion 11 is bent at the gap (A) and guided to the back side of the solar battery cell 2. What is necessary is just to set the distance (B) between the edge part of the photovoltaic cell 2, and the boundary part of the flat part 11 of the photovoltaic cell connection wiring member 1, and the wire part 10 as follows.

扁平部１１とワイヤ部１０との境界部が太陽電池セル２の表面側に何ｍｍか延出する場合、この場合は間隙（Ａ）よりプラス分大きくなるので、プラスということにする。扁平部１１とワイヤ部との境界部が間隙側に位置する場合、この場合は間隙（Ａ）より小さくなるので、マイナスということにする。太陽電池セル２の端面と太陽電池セル接続配線部材１の扁平部１１とワイヤ部との境界部間の距離（Ｂ）は、１ｍｍから２ｍｍ程度の間隙（Ａ）の場合、好ましくはプラス２ｍｍ〜マイナス１ｍｍの範囲にする。   When the boundary portion between the flat portion 11 and the wire portion 10 extends by several mm toward the surface side of the solar battery cell 2, it is larger than the gap (A). When the boundary portion between the flat portion 11 and the wire portion is located on the gap side, in this case, it is smaller than the gap (A), so it is referred to as minus. The distance (B) between the end face of the solar battery cell 2 and the boundary part between the flat part 11 and the wire part of the solar battery connection wiring member 1 is preferably 2 mm to 2 mm in the case of a gap (A) of about 1 mm to 2 mm. The range is minus 1 mm.

プラスとマイナスにより、次のような影響がある。距離Ｂをプラスにした場合、ワイヤ部１０の折り曲げに伴ったワイヤ厚みによるセル割れを有効に防止できる。しかし、扁平部１１が太陽電池セル２の表面側に位置する関係から、扁平部１１の影の増大が入射光量を低下させて発電量がその分低下する。逆にマイナスの場合、影を最大限防止できるが、セル割れによる歩留まり低下を増加させる。このことから、セル間距離を縮めるに従い、太陽電池セル２の端面と太陽電池セル接続配線部材１の扁平部１１とワイヤ部との境界部間の距離（Ｂ）は若干プラスとすることが好ましい。   Positive and negative effects have the following effects. When the distance B is made positive, cell cracking due to the wire thickness accompanying the bending of the wire portion 10 can be effectively prevented. However, from the relationship in which the flat part 11 is located on the surface side of the solar battery cell 2, an increase in the shadow of the flat part 11 decreases the amount of incident light, and the power generation amount decreases accordingly. Conversely, if it is negative, shadows can be prevented to the maximum, but the yield drop due to cell cracking is increased. From this, it is preferable that the distance (B) between the end surface of the solar cell 2 and the boundary portion between the flat portion 11 and the wire portion of the solar cell connection wiring member 1 is slightly increased as the inter-cell distance is reduced. .

上記した実施形態においては、扁平部１１を圧延加工により形成したが、圧延加工に限らず、切削等、その他の方法で形成しても良い。また、上記した実施形態においては、断面形状が円形のワイヤを用いたが、厚みを持たす部分の断面形状は円形に限らず、矩形、三角形、楕円形などの形状のものを用いても良い。   In the above-described embodiment, the flat portion 11 is formed by rolling. However, the flat portion 11 is not limited to rolling, and may be formed by other methods such as cutting. In the above-described embodiment, the wire having a circular cross-sectional shape is used. However, the cross-sectional shape of the portion having the thickness is not limited to a circular shape, and a rectangular shape, a triangular shape, an elliptical shape, or the like may be used.

尚、上記した実施形態においては、太陽電池セルとして、単結晶シリコン基板と非晶質シリコン層との間に実質的に真性な非晶質シリコン層を挟み、その界面での欠陥を低減し、ヘテロ接合界面の特性を改善した太陽電池セルを用いたが、太陽電池セルは、これに限らず結晶系、多結晶系などの太陽電池セルにも適用できる。   In the above-described embodiment, as a solar battery cell, a substantially intrinsic amorphous silicon layer is sandwiched between a single crystal silicon substrate and an amorphous silicon layer, and defects at the interface are reduced. Although the solar cell improved in the characteristics of the heterojunction interface was used, the solar cell is not limited to this and can be applied to a solar cell such as a crystal system or a polycrystalline system.

今回開示された実施の形態はすべての点で例示であって制限的なものではないと考えられるべきである。この発明の範囲は、上記した実施の形態の説明ではなくて特許請求の範
囲によって示され、特許請求の範囲と均等の意味および範囲内でのすべての変更が含まれることが意図される。 The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include all modifications within the meaning and scope equivalent to the scope of claims for patent.

この発明の実施形態にかかる太陽電池セル接続用配線部材を示す斜視図である。It is a perspective view which shows the wiring member for photovoltaic cell connection concerning embodiment of this invention. この発明に用いられるワイヤを示す斜視図である。It is a perspective view which shows the wire used for this invention. この発明の他の実施形態にかかる太陽電池セル接続用配線部材を示す斜視図である。It is a perspective view which shows the wiring member for photovoltaic cell connection concerning other embodiment of this invention. この発明の実施形態に用いられる太陽電池セルを示す概略断面図である。It is a schematic sectional drawing which shows the photovoltaic cell used for embodiment of this invention. 太陽電池セルとこの発明の太陽電池セル接続配線部材とを接続した状態を示す平面図である。It is a top view which shows the state which connected the photovoltaic cell and the photovoltaic cell connection wiring member of this invention. 太陽電池セルとこの発明の太陽電池セル接続配線部材とを接続した状態を示す断面図である。It is sectional drawing which shows the state which connected the photovoltaic cell and the photovoltaic cell connection wiring member of this invention. 太陽電池セル接続配線部材と集電極との接続状態を示す拡大断面図である。It is an expanded sectional view which shows the connection state of a photovoltaic cell connection wiring member and a collector electrode. 太陽電池セルとこの発明の太陽電池セル接続配線部材とを接続した状態を示す平面図である。It is a top view which shows the state which connected the photovoltaic cell and the photovoltaic cell connection wiring member of this invention.

符号の説明Explanation of symbols

１ 太陽電池セル接続用配線部材
１０ ワイヤ部
１１ 扁平部
DESCRIPTION OF SYMBOLS 1 Solar cell connection wiring member 10 Wire part 11 Flat part

Claims (7)

太陽電池素子の表面側電極と隣接する太陽電池素子の裏面側電極とを電気的に接続する配線部材において、太陽電池素子間の間隙部に位置する箇所は少なくとも扁平部を有し、太陽電池セルの表面側電極上に接続される部分は少なくとも前記扁平部より厚みを有し且つその幅が扁平部より狭く形成されていることを特徴とする太陽電池セル接続用配線部材。 In the wiring member that electrically connects the front surface side electrode of the solar cell element and the back surface side electrode of the adjacent solar cell element, the portion located in the gap between the solar cell elements has at least a flat portion, and the solar cell The solar cell connecting wiring member, wherein a portion connected to the surface side electrode of the solar cell has a thickness at least that of the flat portion and is narrower than the flat portion. 前記表面側電極上に接続される部分はワイヤからなることを特徴とする請求項１に記載の太陽電池セル接続用配線部材。 The solar cell connection wiring member according to claim 1, wherein a portion connected to the surface-side electrode is made of a wire. 前記配線部材の隣接する太陽素子の裏面側電極上と接続する部分は扁平部で構成されていることを特徴とする特徴とする請求項１または２に記載の太陽電池セル接続用配線部材。 The wiring member for connecting a solar battery cell according to claim 1 or 2, wherein a portion of the wiring member connected to the back surface side electrode of the adjacent solar element is formed as a flat portion. 前記配線部材の隣接する太陽素子の裏面側電極上と接続する部分はワイヤで構成されていることを特徴とする特徴とする請求項１または２に記載の太陽電池セル接続用配線部材。 The wiring member for connecting a solar battery cell according to claim 1 or 2, wherein a portion of the wiring member connected to the back surface side electrode of the adjacent solar element is constituted by a wire. 前記扁平部は前記ワイヤの直径の半分の厚みに形成されていることを特徴とする請求項２または４に記載の太陽電池セル接続用配線部材。 5. The solar cell connecting wiring member according to claim 2, wherein the flat portion is formed to have a thickness that is half the diameter of the wire. 前記扁平部は、太陽電池セル間の間隙部より大きく形成されていることを特徴とする請求項１または２に記載の太陽電池セル接続用配線部材。 The said flat part is formed larger than the gap | interval part between photovoltaic cells, The wiring member for photovoltaic cell connection of Claim 1 or 2 characterized by the above-mentioned. 請求項１ないし６のいずれかに記載の太陽電池セル接続用配線部材を介して太陽電池セル同士を電気的に接続したことを特徴とする太陽電池装置。 A solar battery device, wherein the solar battery cells are electrically connected to each other via the solar battery cell connecting wiring member according to claim 1.
JP2006099476A 2006-03-31 2006-03-31 Wiring member for solar cell connection and solar battery device using same Pending JP2007273857A (en)

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