JP2007019334A - Solar cell device - Google Patents

Solar cell device Download PDF

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JP2007019334A
JP2007019334A JP2005200639A JP2005200639A JP2007019334A JP 2007019334 A JP2007019334 A JP 2007019334A JP 2005200639 A JP2005200639 A JP 2005200639A JP 2005200639 A JP2005200639 A JP 2005200639A JP 2007019334 A JP2007019334 A JP 2007019334A
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solar cell
substrate
wiring pattern
solar
back surface
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Junichi Yasuda
順一 安田
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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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

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Abstract

<P>PROBLEM TO BE SOLVED: To obtain a highly environmentally-resistant solar cell device capable of preventing a solar cell from being broken when assembling the solar cell device, even in a solar cell in which an electrode is not provided to the light-receiving face side and all the electrodes of positive/negative poles are formed to the rear face side by through-holes. <P>SOLUTION: The solar cell device is provided with the solar cell in which the light-receiving face of a p-type semiconductor having a plurality of the through-holes penetrating the light-receiving face and its rear face, inner walls of the through-holes, and each periphery of the through-holes in the rear face are made into an n-type, and a positive electrode connected with a p-type part and a negative electrode connected with an n-type part are formed on its rear face; and a substrate having a wiring pattern formed corresponding to electrode forming positions of the solar cell. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

この発明は、受光面側に電極がなく、貫通孔により正極と負極の全ての電極が裏面側に形成された太陽電池セルを利用した太陽電池装置に関するものである。   The present invention relates to a solar battery device using a solar battery cell in which no electrode is provided on the light receiving surface side and all the positive and negative electrodes are formed on the back surface side by through holes.

従来の太陽電池装置では、太陽電池セルと電子部品を伴うプリント基板とを組み立てる際のリード配線性の改善や、機器全体をよりコンパクトにするために、ガラス基板を伴うアモルファス太陽電池セルおよびシリコン系太陽電池セルなどの一般的な太陽電池セルの裏面側にプリント基板を接合している（たとえば、特許文献１，２参照）。   In conventional solar cell devices, amorphous solar cells and silicon-based glass substrates are used in order to improve lead wiring properties when assembling solar cells and printed circuit boards with electronic components, and to make the entire device more compact. A printed circuit board is bonded to the back side of a general solar battery cell such as a solar battery cell (see, for example, Patent Documents 1 and 2).

実開平１−１７６９５７号公報Japanese Utility Model Publication No. 1-176957 実開昭６２−１２４８６６号公報Japanese Utility Model Publication No. 62-124866 特開平９−２９３８８８号公報JP-A-9-293888

しかしながら、従来の太陽電池装置では、現在住宅用および業務用などで主流となっているサブストレート方式の太陽光発電パネルを構成するために複数の太陽電池セルを直列化する際のリード配線性、および太陽光発電パネルで特有な温度サイクル負荷によるリード線の断線対策を考慮していないという問題点があった。   However, in the conventional solar cell device, lead wiring properties when serializing a plurality of solar cells in order to constitute a substrate type solar power generation panel which is currently mainstream for residential use and commercial use, In addition, there is a problem that measures for disconnection of lead wires due to a temperature cycle load peculiar to solar power generation panels are not taken into consideration.

また、受光面積を最大限確保するために、受光面側に電極がなく、受光面と裏面を貫く貫通孔により正極と負極の全ての電極が裏面側に形成され、かつ貫通孔の存在により比較的強度の弱い特殊な太陽電池セルが提案されている（たとえば、特許文献３参照）が、このような太陽電池セルに対しては、太陽電池装置を組み立てる際の破損対策が不十分であるという問題点もあった。   In addition, in order to secure the maximum light receiving area, there is no electrode on the light receiving surface side, all the positive and negative electrodes are formed on the back surface side through through holes that penetrate the light receiving surface and the back surface, and the presence of through holes is compared. A special solar cell with low mechanical strength has been proposed (for example, see Patent Document 3), but for such a solar cell, measures against damage when assembling a solar cell device are insufficient. There was also a problem.

この発明は、上記に鑑みてなされたもので、受光面側に電極がなく、貫通孔により正極と負極の全ての電極が裏面側に形成された太陽電池セルにおいても、太陽電池装置を組み立てる際の太陽電池セルの破損を抑えることができる太陽電池装置を得ることを目的とする。また、比較的強度の弱い特殊な太陽電池セルを用いた場合でも、強度を上げることができる太陽電池装置を得ることも目的とする。   The present invention has been made in view of the above, and when assembling a solar battery device even in a solar battery cell in which no electrode is formed on the light receiving surface side and all electrodes of the positive electrode and the negative electrode are formed on the back surface side by the through holes. It aims at obtaining the solar cell apparatus which can suppress damage of the photovoltaic cell of this. Another object of the present invention is to obtain a solar cell device that can increase the strength even when special solar cells having relatively low strength are used.

上記目的を達成するため、この発明にかかる太陽電池装置は、受光面とその裏面を貫く貫通孔が複数形成されたｐ型の半導体の受光面、前記貫通孔内壁および裏面の前記貫通孔周辺をｎ型にするとともに、その裏面に前記ｐ型部分と接続される正電極と、前記ｎ型部分と接続される負電極と、を形成した太陽電池セルと、前記太陽電池セルの電極形成位置に対応して形成された配線パターンを有する基板と、を備えることを特徴とする。   In order to achieve the above object, a solar cell device according to the present invention includes a light receiving surface of a p-type semiconductor in which a plurality of through holes penetrating the light receiving surface and its back surface are formed, the inner wall of the through hole, and the periphery of the through hole on the back surface. A solar cell having an n-type and a positive electrode connected to the p-type portion and a negative electrode connected to the n-type portion on the back surface thereof, and an electrode forming position of the solar cell And a substrate having a correspondingly formed wiring pattern.

この発明によれば、太陽電池セルの裏面側の電極位置に予め合わせた配線パターンを持つ基板を使用することで、太陽電池セルの裏面側に、正電極同士や、負電極同士を繋げる電極パターンを設けることが不要となり、太陽電池セルの製造プロセスの簡略化や、電極材料の使用量を削減することができる。   According to this invention, by using a substrate having a wiring pattern preliminarily aligned with the electrode position on the back surface side of the solar battery cell, the electrode pattern that connects the positive electrodes or the negative electrodes to the back surface side of the solar battery cell. Therefore, the manufacturing process of the solar battery cell can be simplified and the amount of the electrode material used can be reduced.

以下に添付図面を参照して、この発明にかかる太陽電池装置の好適な実施の形態を詳細に説明する。   Exemplary embodiments of a solar cell device according to the present invention will be explained below in detail with reference to the accompanying drawings.

実施の形態１．
図１は、この発明にかかる太陽電池装置の太陽電池セルの受光面側の構造を示す平面図であり、図２は、図１の太陽電池セルの構造を示す下面図であり、図３は、太陽電池セルと接合される片面プリント基板の構造を示す平面図であり、図４は、太陽電池装置を複数直列に接合した状態を受光面側から見た平面図であり、図５は、従来の太陽電池装置における複数の太陽電池セルを直列に接合した場合の断面図である。 Embodiment 1 FIG.
1 is a plan view showing the structure of the light receiving surface side of the solar battery cell of the solar battery device according to the present invention, FIG. 2 is a bottom view showing the structure of the solar battery cell of FIG. 1, and FIG. FIG. 4 is a plan view showing the structure of a single-sided printed circuit board to be joined to a solar battery cell, FIG. 4 is a plan view of a state in which a plurality of solar battery devices are joined in series from the light receiving surface side, and FIG. It is sectional drawing at the time of joining the several photovoltaic cell in the conventional solar cell apparatus in series.

この太陽電池装置に使用される太陽電池セル２は、受光面側には、光閉じ込めのためのテクスチャ構造が形成される。また、図１に示されるように、表面から裏面に貫通する貫通孔１が所定の配列パターンにしたがって形成される。受光面側には、電極は形成されておらず、貫通孔１のみが形成されている。この太陽電池セル２がたとえばｐ型の多結晶シリコンで構成される場合には、リンなどのドナーの拡散によってテクスチャ表面、貫通孔１内壁および裏面の貫通孔１周辺部にｎ型層が形成される。また、図２に示されるように、太陽電池セル２の裏面側には、受光面側から貫通される貫通孔１の周囲に形成される負電極３と、貫通孔１の配列パターンにしたがって貫通孔１と貫通孔１との間に形成される正電極４と、が形成されている。   In the solar battery cell 2 used in this solar battery device, a texture structure for light confinement is formed on the light receiving surface side. Further, as shown in FIG. 1, through holes 1 penetrating from the front surface to the back surface are formed according to a predetermined arrangement pattern. No electrode is formed on the light receiving surface side, and only the through hole 1 is formed. When this solar cell 2 is made of, for example, p-type polycrystalline silicon, an n-type layer is formed on the texture surface, the inner wall of the through hole 1 and the periphery of the through hole 1 on the back surface by diffusion of a donor such as phosphorus. The Further, as shown in FIG. 2, the back surface side of the solar battery cell 2 penetrates according to the arrangement pattern of the negative electrode 3 formed around the through hole 1 penetrating from the light receiving surface side and the through hole 1. A positive electrode 4 formed between the hole 1 and the through hole 1 is formed.

片面プリント基板６は、図３に示されるように、矩形状の構造を有し、太陽電池セル２の裏面側と接合される側には、太陽電池セル２の裏面側の電極３，４の形成位置に合わせた配線パターン５を有する。また、他の片面プリント基板６と直列に接続するための凸部７ａ，７ｂが、対向する一対の辺上に形成される。この図３の例では、この凸部７ａ，７ｂの形成位置は、対向する一対の辺上の対向する位置に形成されるのではなく、他の片面プリント基板６の凸部７ａ，７ｂを隣接させるように配置したときに、凸部７ａ，７ｂ同士が同じ位置に来ないように形成されている。この凸部７ａ，７ｂには、太陽電池セル２の負電極３と正電極４の出力がそれぞれ集められた集線部５ａを有する配線パターン５が施されている。たとえば、一方の凸部７ａには、太陽電池セル２の負電極３の出力が集められ、他方の凸部７ｂには、その正電極４の出力が集められる。この片面プリント基板６の材質としては、ガラスエポキシや、紙フェノールなどを挙げることができる。また、太陽電池セル２との接合に導電性接着剤を用いる場合は片面プリント基板６に特別なコーティングを必要としないが、はんだ接合をする場合は、配線パターン５の面にプリフラックスを施したものや、配線パターン５をはんだコートした片面プリント基板６を用いることが望ましい。なお、片面プリント基板６の大きさは、両側の凸部７ａ，７ｂを除き、太陽電池セル２の外形と同じか、太陽電池セル２の幅、長さに対し０．１ｍｍ〜５ｍｍ程度大きいものとする。なお、この片面プリント基板６は、特許請求の範囲における基板に対応している。   As shown in FIG. 3, the single-sided printed circuit board 6 has a rectangular structure, and the electrodes 3 and 4 on the back surface side of the solar battery cell 2 are formed on the side joined to the back surface side of the solar battery cell 2. The wiring pattern 5 is adjusted to the formation position. Moreover, the convex parts 7a and 7b for connecting in series with the other single-sided printed circuit board 6 are formed on a pair of opposing sides. In the example of FIG. 3, the convex portions 7a and 7b are not formed at opposing positions on a pair of opposing sides, but are adjacent to the convex portions 7a and 7b of the other single-sided printed circuit board 6. Thus, the protrusions 7a and 7b are formed so as not to come to the same position. A wiring pattern 5 having a concentrating portion 5a in which outputs of the negative electrode 3 and the positive electrode 4 of the solar battery cell 2 are collected is applied to the convex portions 7a and 7b. For example, the output of the negative electrode 3 of the solar battery cell 2 is collected on one convex portion 7a, and the output of the positive electrode 4 is collected on the other convex portion 7b. Examples of the material of the single-sided printed circuit board 6 include glass epoxy and paper phenol. In addition, when a conductive adhesive is used for joining to the solar battery cell 2, no special coating is required on the single-sided printed circuit board 6, but when soldering, a preflux is applied to the surface of the wiring pattern 5. It is desirable to use a single-sided printed circuit board 6 that is solder-coated with a wiring pattern 5. In addition, the size of the single-sided printed circuit board 6 is the same as the outer shape of the solar battery cell 2 except for the convex portions 7a and 7b on both sides, or about 0.1 mm to 5 mm larger than the width and length of the solar battery cell 2. And In addition, this single-sided printed circuit board 6 respond | corresponds to the board | substrate in a claim.

太陽電池装置８は、太陽電池セル２の裏面側を、片面プリント基板６の配線パターン５が形成された面と対向させて、導電性接着剤やはんだなどを用いて両者を接着することによって製造される。また、このような太陽電池装置８を、片面プリント基板６に形成された凸部７ａと、他の太陽電池装置８の凸部７ｂとを向き合わせて電気的に接続させることで、図４に示されるように、複数直列に接続した太陽電池装置８を得ることができる。具体的には、ある太陽電池装置８の一方の極性の電極の凸部７ｂ上に形成された配線パターン５の集線部と、隣接する太陽電池装置８の他方の極性の電極の凸部７ａ上に形成された配線パターン５の集線部とをリード線９により直列接合して、直列接続された太陽電池装置８が得られる。   The solar cell device 8 is manufactured by making the back surface side of the solar cell 2 face the surface on which the wiring pattern 5 of the single-sided printed circuit board 6 is formed, and bonding the two using a conductive adhesive or solder. Is done. Further, such a solar cell device 8 is electrically connected by facing the convex portion 7a formed on the single-sided printed circuit board 6 and the convex portion 7b of the other solar cell device 8, as shown in FIG. As shown, a plurality of solar cell devices 8 connected in series can be obtained. Specifically, the concentrated portion of the wiring pattern 5 formed on the convex portion 7b of one polarity electrode of a certain solar cell device 8 and the convex portion 7a of the other polarity electrode of the adjacent solar cell device 8 The concentrating portions of the wiring pattern 5 formed in the above are joined in series by the lead wires 9 to obtain the solar cell device 8 connected in series.

この実施の形態１によれば、まず太陽電池セル２の裏面側の電極３，４の形成位置に予め合わせた配線パターン５を持つ片面プリント基板６を使用することで、太陽電池セル２の裏面側に、正電極４同士や、負電極３同士を繋げる電極パターンを設けることが不要となり、太陽電池セル２の製造プロセスの簡略化や、電極材料の使用量を削減することができるという効果を有する。   According to the first embodiment, first, the back surface of the solar battery cell 2 is obtained by using the single-sided printed board 6 having the wiring pattern 5 that is preliminarily aligned with the formation positions of the electrodes 3 and 4 on the back surface side of the solar battery cell 2. It is not necessary to provide an electrode pattern for connecting the positive electrodes 4 or the negative electrodes 3 on the side, and it is possible to simplify the manufacturing process of the solar battery cell 2 and reduce the amount of electrode material used. Have.

また、従来のシリコン系太陽電池セルを用いた太陽電池装置は、太陽電池セルの受光面側と裏面側のそれぞれに電極を有している。そのため、図５に示されるように、太陽電池装置を複数直列に接続する場合には、ある太陽電池セル１１０の受光面側の電極（図示せず）と接続されたリード線１１１を、隣接する太陽電池セル１１０の裏面側の電極（図示せず）と接続させる。太陽電池装置の発電効率を確保するためには、一般的に太陽電池セル１１０は狭い間隙で隣接させる必要があるので、リード線１１１は隣接する太陽電池セル１１０同士の間で、太陽電池セル１１０の概ね厚み分の段差１１２を成形するのが普通である。しかし、温度サイクル試験を実施すると、このリード線１１１の段差１１２に形成される屈曲部が破断し、発電出力が出なくなる不具合が少なからず発生する場合があった。   Moreover, the conventional solar cell apparatus using the silicon-type solar cell has an electrode on each of the light receiving surface side and the back surface side of the solar cell. Therefore, as shown in FIG. 5, when a plurality of solar battery devices are connected in series, a lead wire 111 connected to an electrode (not shown) on the light receiving surface side of a certain solar battery cell 110 is adjacent. It connects with the electrode (not shown) of the back surface side of the photovoltaic cell 110. FIG. In order to ensure the power generation efficiency of the solar battery device, the solar battery cells 110 generally need to be adjacent to each other with a narrow gap, and therefore, the lead wire 111 is between the adjacent solar battery cells 110. It is usual to form a step 112 of approximately the thickness of. However, when the temperature cycle test is carried out, there are not a few problems that the bent portion formed in the step 112 of the lead wire 111 breaks and no power generation output is generated.

これに対して、この実施の形態１の太陽電池装置８では、片面プリント基板６によって太陽電池装置８の正極と負極が共に受光面側に配されており、隣接する太陽電池装置８の正極と負極間を接続する場合に、片面プリント基板６の凸部７に形成された配線パターン５の集線部５ａの間をリード線９がストレートの状態で接続することができる。その結果、温度サイクル負荷におけるリード線９の破断の問題を払拭することができ、耐環境性の高い太陽電池装置８を得ることができるという効果を有する。   On the other hand, in the solar cell device 8 of the first embodiment, the positive electrode and the negative electrode of the solar cell device 8 are both arranged on the light receiving surface side by the single-sided printed circuit board 6, and the positive electrode of the adjacent solar cell device 8 When the negative electrodes are connected, the lead wires 9 can be connected in a straight state between the concentrating portions 5a of the wiring pattern 5 formed on the convex portion 7 of the single-sided printed board 6. As a result, the problem of breakage of the lead wire 9 under a temperature cycle load can be eliminated, and the solar cell device 8 having high environmental resistance can be obtained.

さらに、一般的な太陽電池装置の構成では、太陽電池セルの裏面側に熱可塑性樹脂（図示せず）と背面保護シート（図示せず）が存在するが、図５に示したように、太陽電池セル１１０の裏面側にリード線１１１が接合されていると、リード線１１１の厚み、切断時のカエリ、およびはんだ接合の場合のはんだトゲなどによって、背面保護シート側の絶縁距離が不十分となって、市場で絶縁不良が発生することがあった。   Furthermore, in the configuration of a general solar battery device, a thermoplastic resin (not shown) and a back protection sheet (not shown) exist on the back side of the solar battery cell. As shown in FIG. If the lead wire 111 is joined to the back surface side of the battery cell 110, the insulation distance on the back protective sheet side is insufficient due to the thickness of the lead wire 111, the burrs at the time of cutting, the solder thorn in the case of solder joining, etc. As a result, poor insulation sometimes occurred in the market.

これに対して、この実施の形態１の太陽電池装置８では、片面プリント基板６によって太陽電池装置８の正極と負極が共に受光面側の面に配されているので、この太陽電池装置８を直列に接続する構成では、隣接する太陽電池装置８の電極間を接続するリード線９は、受光面側の保護ガラス（図示せず）側となり、上記のような絶縁不良問題が発生しないという効果を有する。   On the other hand, in the solar cell device 8 of the first embodiment, both the positive electrode and the negative electrode of the solar cell device 8 are arranged on the light receiving surface side by the single-sided printed circuit board 6. In the structure connected in series, the lead wire 9 connecting the electrodes of the adjacent solar cell devices 8 is on the side of the protective glass (not shown) on the light receiving surface side, and the above-described problem of insulation failure does not occur. Have

さらにまた、太陽電池装置８の製造工程中には、熱可塑性樹脂を架橋させるための熱プレス工程が存在するが、貫通孔１の存在により非常に強度の弱い特殊な太陽電池セル２であっても、太陽電池セル２の裏面側に、太陽電池セル２の外形と同じか、または太陽電池セル２の幅、長さに対し０．１〜５ｍｍ程度大きくした片面プリント基板６を接合するようにしたので、プレス圧が直接太陽電池セル２にかからなくすることができる。その結果、太陽電池セル２の破損を抑制することができるという効果を有する。   Furthermore, in the manufacturing process of the solar battery device 8, there is a hot press process for crosslinking the thermoplastic resin, but the special solar battery cell 2 is very weak due to the presence of the through hole 1. In addition, the single-sided printed circuit board 6 that is the same as the outer shape of the solar battery cell 2 or larger than the width and length of the solar battery cell 2 by about 0.1 to 5 mm is joined to the back surface side of the solar battery cell 2. Therefore, the press pressure can be directly applied to the solar battery cell 2. As a result, the solar cell 2 can be prevented from being damaged.

実施の形態２．
実施の形態１では、太陽電池装置８同士をリード線９で接合させるための凸部７ａ，７ｂを片面プリント基板６の一対の対向する辺の中央部付近に設ける場合を示したが、この実施の形態２では、凸部の形成位置を変えた場合について説明する。 Embodiment 2. FIG.
In the first embodiment, the case where the convex portions 7a and 7b for joining the solar cell devices 8 to each other with the lead wires 9 are provided in the vicinity of the center portion of the pair of opposing sides of the single-sided printed board 6 has been described. In Embodiment 2, a case where the formation position of the convex portion is changed will be described.

図６は、片面プリント基板の実施の形態２の構造を示す平面図であり、図７は、片面プリント基板を接合した太陽電池セルを複数直列に接合した状態を受光面側から見た平面図である。なお、太陽電池セル２は、実施の形態１の図１と図２に示されるものと同じ構造であるものとする。この片面プリント基板１２は、矩形状を有し、そのうちの一辺上の両端部に凸部１３ａ，１３ｂを設けるようにしている。そして、それぞれの凸部１３ａ，１３ｂに、太陽電池セルの負電極３、正電極４に接続されるように形成された配線パターン１４を集線する集線部１４ａが形成される。このような構造とすることによって、実施の形態１の場合に比して片面プリント基板１２を製造する際の材料歩留りを向上させることができ、コストダウンに繋げることができる。なお、この片面プリント基板１２は、特許請求の範囲における基板に対応している。   6 is a plan view showing the structure of the second embodiment of the single-sided printed circuit board, and FIG. 7 is a plan view of a state in which a plurality of solar cells joined with the single-sided printed circuit board are joined in series, as seen from the light-receiving surface side. It is. It is assumed that solar cell 2 has the same structure as that shown in FIGS. 1 and 2 of the first embodiment. This single-sided printed circuit board 12 has a rectangular shape, and is provided with convex portions 13a and 13b at both ends on one side thereof. And the concentrating part 14a which condenses the wiring pattern 14 formed so that it may be connected to the negative electrode 3 and the positive electrode 4 of a photovoltaic cell is formed in each convex part 13a, 13b. By adopting such a structure, it is possible to improve the material yield when manufacturing the single-sided printed circuit board 12 as compared with the case of the first embodiment, and it is possible to reduce the cost. In addition, this single-sided printed circuit board 12 respond | corresponds to the board | substrate in a claim.

図６に示される片面プリント基板１２に、実施の形態１で説明した太陽電池セル２を接合し、複数直列に接続した状態の太陽電池装置１５を受光面側から見た平面図が図７に示されている。この図７に示されるように、片面プリント基板１２の凸部１３が互いに隣接するようにそれぞれの太陽電池装置１５を配置し、ある太陽電池装置１５の一方の極性の電極の凸部１３ａの配線パターン１４の集線部１４ａと、隣の太陽電池装置１５の他方の極性の電極の凸部１３ｂの配線パターン１４の集線部１４ａとをリード線１６により直列接合する。このとき、ある太陽電池装置１５の凸部１３ａ，１３ｂは、隣接する他の太陽電池装置１５の凸部１３ａ，１３ｂと接触して配置されるために、実施の形態１の場合に比して、太陽電池装置１５の直列接合後の組み立て長さ、およびリード線１６の使用長さを短くすることができる。   FIG. 7 is a plan view of the solar battery device 15 in a state in which the solar battery cells 2 described in the first embodiment are joined to the single-sided printed board 12 shown in FIG. It is shown. As shown in FIG. 7, the solar cell devices 15 are arranged so that the convex portions 13 of the single-sided printed circuit board 12 are adjacent to each other, and the wiring of the convex portion 13a of one polarity electrode of a certain solar cell device 15 is arranged. The concentrating portion 14 a of the pattern 14 and the concentrating portion 14 a of the wiring pattern 14 of the convex portion 13 b of the other polarity electrode of the adjacent solar cell device 15 are joined in series by a lead wire 16. At this time, since the convex portions 13a and 13b of a certain solar cell device 15 are arranged in contact with the convex portions 13a and 13b of other adjacent solar cell devices 15, compared to the case of the first embodiment. The assembly length after series joining of the solar cell device 15 and the use length of the lead wire 16 can be shortened.

この実施の形態２によれば、矩形状を有する片面プリント基板１２の一辺の両端部に凸部１３ａ，１３ｂを設けるようにしたので、太陽電池装置１５を直列につなげる際に、太陽電池装置１５間の距離を短くして配置することができ、さらに、凸部１３ａ，１３ｂの配線パターン１４の集線部１４ａの間を結ぶリード線１６を実施の形態１の場合に比して短くすることができるという効果を有する。また、片面プリント基板１２は、矩形状を有し、凸部１３ａ，１３ｂがその一辺の両端部に設けられる構造となっているので、材料歩留りを向上させることができるという効果も有する。   According to the second embodiment, since the convex portions 13a and 13b are provided at both ends of one side of the single-sided printed circuit board 12 having a rectangular shape, the solar cell device 15 is connected when the solar cell devices 15 are connected in series. The distance between them can be shortened, and the lead wires 16 connecting the concentrating portions 14a of the wiring patterns 14 of the convex portions 13a and 13b can be shortened as compared with the case of the first embodiment. It has the effect of being able to. Moreover, since the single-sided printed circuit board 12 has a rectangular shape and has a structure in which the convex portions 13a and 13b are provided at both end portions of one side, it has an effect that the material yield can be improved.

実施の形態３．
この実施の形態３では、太陽電池セルと接続するプリント基板として、両面に配線パターンが形成された両面プリント基板を用いる場合を説明する。図８は、両面プリント基板の太陽電池セルの受光面側から見た平面図であり、図９は、図８の両面プリント基板の下面図であり、図１０は、両面プリント基板に太陽電池セルを接合した太陽電池装置を直列に複数接続した場合の受光面側から見た平面図であり、図１１は、図１０の太陽電池装置の下面図である。なお、この実施の形態３でも、太陽電池セル２は実施の形態１の図１と図２と同様の構造を有するものとする。 Embodiment 3 FIG.
In this Embodiment 3, the case where the double-sided printed board with which the wiring pattern was formed in both surfaces is used as a printed board connected with a photovoltaic cell is demonstrated. 8 is a plan view of the double-sided printed circuit board as viewed from the light receiving surface side of the solar cell, FIG. 9 is a bottom view of the double-sided printed circuit board of FIG. 8, and FIG. FIG. 11 is a bottom view of the solar cell device of FIG. 10. FIG. 11 is a plan view seen from the light receiving surface side when a plurality of solar cell devices joined together are connected in series. In the third embodiment, the solar battery cell 2 is assumed to have the same structure as that in FIGS. 1 and 2 of the first embodiment.

両面プリント基板１８は、太陽電池セル２の裏面側に形成される正電極４と負電極３と同じ位置またはそれらの近辺の位置に形成されたスルーホール１９を有する。このスルーホール１９の内壁には、両面プリント基板１８の表裏面に形成された配線パターン１７，２０を導通させるための導電性材料が形成されている。また、図８に示されるように、両面プリント基板１８の受光面側には、同一列に形成された正電極４に接続されるスルーホール１９同士または負電極３に接続されるスルーホール１９同士を導通させるための配線パターン１７が形成される。この配線パターン１７を設けることで、スルーホール１９の位置と太陽電池セル２の正電極４と負電極３の位置とが接合時にずれてしまったときでも、両者の間で導通をとることが可能になる。なお、この配線パターン１７は、スルーホール１９が、太陽電池セル２の正電極４と負電極３に対して同位置に形成され、導通抵抗上の問題がなければ、設けなくても良い。   The double-sided printed circuit board 18 has a through hole 19 formed at the same position as the positive electrode 4 and the negative electrode 3 formed on the back surface side of the solar battery cell 2 or at a position in the vicinity thereof. On the inner wall of the through hole 19, a conductive material for conducting the wiring patterns 17 and 20 formed on the front and back surfaces of the double-sided printed board 18 is formed. Further, as shown in FIG. 8, on the light receiving surface side of the double-sided printed circuit board 18, the through holes 19 connected to the positive electrodes 4 formed in the same row or the through holes 19 connected to the negative electrode 3 are connected to each other. A wiring pattern 17 is formed for electrical conduction. By providing this wiring pattern 17, even when the position of the through hole 19 and the positions of the positive electrode 4 and the negative electrode 3 of the solar battery cell 2 are deviated at the time of joining, it is possible to establish conduction between the two. become. Note that the wiring pattern 17 may be omitted if the through-hole 19 is formed at the same position with respect to the positive electrode 4 and the negative electrode 3 of the solar battery cell 2 and there is no problem in conduction resistance.

一方、図９に示されるように、両面プリント基板１８の裏面側には、太陽電池セル２の正電極４と接続されるスルーホール１９同士を接続し、また太陽電池セル２の負電極３と接続されるスルーホール１９同士を接続し、両面プリント基板１８上のスルーホール１９が形成されていない周縁部に集線する集線部２０ａを有する配線パターン２０が設けられる。両面プリント基板１８の裏面の周縁部に形成される集線部２０ａは、両面プリント基板１８が矩形状を有する場合には、対向する一対の辺上に形成される。たとえば、図９の両面プリント基板１８において、左側の周縁部には、正電極４に接続されるスルーホール１９同士を接続する配線の集線部２０ａが形成され、右側の周縁部には、負電極３に接続されるスルーホール１９同士を接続する配線の集線部２０ａが形成される。   On the other hand, as shown in FIG. 9, through holes 19 connected to the positive electrode 4 of the solar battery cell 2 are connected to the back side of the double-sided printed circuit board 18, and the negative electrode 3 of the solar battery cell 2 is connected to A wiring pattern 20 having a concentrating portion 20a for connecting the through holes 19 to be connected and concentrating at a peripheral portion where the through holes 19 on the double-sided printed board 18 are not formed is provided. When the double-sided printed circuit board 18 has a rectangular shape, the concentrator 20a formed at the peripheral edge of the back surface of the double-sided printed circuit board 18 is formed on a pair of opposing sides. For example, in the double-sided printed circuit board 18 of FIG. 9, a wiring concentrating portion 20 a that connects through holes 19 connected to the positive electrode 4 is formed at the left peripheral portion, and a negative electrode is formed at the right peripheral portion. 3 is formed as a wiring concentrating portion 20a that connects the through holes 19 connected to each other.

このような両面プリント基板１８の受光面側に、太陽電池セル２の裏面側が対向するように、そして両面プリント基板１８のスルーホール１９の位置に太陽電池セル２の正電極と負電極の位置を合わせて両者を導電性接着剤やはんだなどを用いて接合し、従来公知の方法によって太陽電池装置が作製される。なお、この両面プリント基板１８は、特許請求の範囲における基板に対応している。   The positions of the positive electrode and the negative electrode of the solar battery cell 2 are set so that the back surface side of the solar battery cell 2 faces the light receiving surface side of the double-sided printed circuit board 18 and the through hole 19 of the double-sided printed circuit board 18. Together, they are joined using a conductive adhesive, solder, or the like, and a solar cell device is produced by a conventionally known method. The double-sided printed board 18 corresponds to the board in the claims.

このように作製した太陽電池装置２１の集線部２０ａが他の太陽電池装置２１の集線部２０ａと隣接するように、具体的には、ある太陽電池装置２１の正極の配線パターン２０に接続される集線部２０ａに他の太陽電池装置２１の負極の配線パターン２０に接続される集線部２０ａが隣接するように、配置し、隣接する両面プリント基板１８の裏面側の集線部２０ａ同士をリード線２２によって接合することで、図１０〜図１１に示される直列に接合した太陽電池装置を得ることができる。   Specifically, the solar cell device 21 manufactured in this way is connected to the positive wiring pattern 20 of a certain solar cell device 21 so that the concentrating portion 20a of the other solar cell device 21 is adjacent. It arrange | positions so that the concentrating part 20a connected to the wiring pattern 20 of the negative electrode of the other solar cell apparatus 21 may adjoin the concentrating part 20a, and the concentrating part 20a of the back surface side of the adjacent double-sided printed circuit board 18 is lead wire 22 The solar cell devices joined in series as shown in FIGS. 10 to 11 can be obtained by joining together.

この実施の形態３によれば、両面プリント基板１８では、裏面側の配線パターン２０の上で、太陽電池装置２１同士をリード線２２により直列接合できるので、実施の形態１，２のような凸部７，１３が不要となり、さらに両面プリント基板１８が矩形状を有するので、プリント基板の材料歩留りを実施の形態２の場合に比してさらに向上させることができる。また、太陽電池装置２１同士の直列接合を隙間なく行なうことができるので、太陽電池装置（太陽光発電パネル）の発電効率を飛躍的に上げることが可能となる。さらに、リード線２２が受光面側から見えないので、太陽光発電パネルの外観性を向上させることができる。   According to the third embodiment, in the double-sided printed circuit board 18, the solar cell devices 21 can be connected in series by the lead wires 22 on the wiring pattern 20 on the back surface side. Since the portions 7 and 13 are not required and the double-sided printed circuit board 18 has a rectangular shape, the material yield of the printed circuit board can be further improved as compared with the second embodiment. Moreover, since the solar cell devices 21 can be connected in series without gaps, the power generation efficiency of the solar cell device (solar power generation panel) can be dramatically increased. Furthermore, since the lead wire 22 is not visible from the light receiving surface side, the appearance of the photovoltaic power generation panel can be improved.

以上のように、この発明にかかる太陽電池装置は、受光面側に電極がなく、貫通孔により正極と負極の全ての電極が裏面側に形成された太陽電池セルを利用した太陽電池装置に有用である。   As described above, the solar cell device according to the present invention is useful for a solar cell device using a solar cell in which no electrode is formed on the light receiving surface side and all the positive and negative electrodes are formed on the back surface side by through holes. It is.

この発明による太陽電池装置の太陽電池セルの受光面側の構造を示す平面図である。It is a top view which shows the structure by the side of the light-receiving surface of the photovoltaic cell of the solar cell apparatus by this invention. 図１の太陽電池セルの構造を示す下面図である。It is a bottom view which shows the structure of the photovoltaic cell of FIG. 太陽電池セルと接合される片面プリント基板の構造を示す平面図である。It is a top view which shows the structure of the single-sided printed circuit board joined with a photovoltaic cell. 片面プリント基板を接合した太陽電池セルを複数直列に接合した状態を受光面側から見た平面図である。It is the top view which looked at the state which joined the photovoltaic cell which joined the single-sided printed circuit board in series from the light-receiving surface side. 従来の太陽電池装置における複数の太陽電池セルを直列に接合した場合の断面図である。It is sectional drawing at the time of joining the several photovoltaic cell in the conventional solar cell apparatus in series. 片面プリント基板の実施の形態２の構造を示す平面図である。It is a top view which shows the structure of Embodiment 2 of a single-sided printed circuit board. 片面プリント基板を接合した太陽電池セルを複数直列に接合した状態を受光面側から見た平面図である。It is the top view which looked at the state which joined the photovoltaic cell which joined the single-sided printed circuit board in series from the light-receiving surface side. 両面プリント基板の太陽電池セルの受光面側から見た平面図である。It is the top view seen from the light-receiving surface side of the photovoltaic cell of a double-sided printed circuit board. 図８の両面プリント基板の下面図である。It is a bottom view of the double-sided printed circuit board of FIG. 両面プリント基板に太陽電池セルを接合した太陽電池装置を直列に複数接続した場合の受光面側から見た平面図である。It is the top view seen from the light-receiving surface side at the time of connecting two or more solar cell apparatuses which joined the photovoltaic cell to the double-sided printed circuit board in series. 図１０の太陽電池装置の下面図である。It is a bottom view of the solar cell apparatus of FIG.

符号の説明Explanation of symbols

１ 貫通孔
２，１１０ 太陽電池セル
３ 負電極
４ 正電極
５，１４，１７，２０ 配線パターン
６，１２ 片面プリント基板
８，１５，２１ 太陽電池装置
９，１６，２２，１１１ リード線
１８ 両面プリント基板 DESCRIPTION OF SYMBOLS 1 Through-hole 2,110 Solar cell 3 Negative electrode 4 Positive electrode 5, 14, 17, 20 Wiring pattern 6,12 Single-sided printed circuit board 8,15,21 Solar cell device 9,16,22,111 Lead wire 18 Double-sided printing substrate

Claims (8)

受光面とその裏面を貫く貫通孔が複数形成されたｐ型の半導体の受光面、前記貫通孔内壁および裏面の前記貫通孔周辺をｎ型にするとともに、その裏面に前記ｐ型部分と接続される正電極と、前記ｎ型部分と接続される負電極と、を形成した太陽電池セルと、
前記太陽電池セルの電極形成位置に対応して形成された配線パターンを有する基板と、
を備えることを特徴とする太陽電池装置。 The light receiving surface of the p-type semiconductor having a plurality of through holes penetrating the light receiving surface and the back surface thereof, the inner wall of the through hole and the periphery of the through hole on the back surface are made n-type, and the back surface is connected to the p-type portion. A positive electrode, and a negative electrode connected to the n-type portion,
A substrate having a wiring pattern formed corresponding to the electrode formation position of the solar battery cell;
A solar cell device comprising: 前記基板は、前記太陽電池セルの外形と同じかまたはそれよりも大きいサイズを有することを特徴とする請求項１に記載の太陽電池装置。   The solar cell device according to claim 1, wherein the substrate has a size that is the same as or larger than an outer shape of the solar cell. 前記基板の配線パターンは、前記太陽電池セルのすべての前記正電極同士および前記負電極同士を結び、それぞれの電極を集線する集線部を備えることを特徴とする請求項１または２に記載の太陽電池装置。   3. The sun according to claim 1, wherein the wiring pattern of the substrate includes a concentrator that connects all the positive electrodes and the negative electrodes of the solar battery cell and collects the respective electrodes. Battery device. 前記基板は、前記配線パターンを一方の面のみに形成した片面基板であり、前記配線パターンの集線部は、前記片面基板の周縁部に形成されることを特徴とする請求項３に記載の太陽電池装置。   The said board | substrate is a single-sided board | substrate which formed the said wiring pattern only in one surface, The concentrating part of the said wiring pattern is formed in the peripheral part of the said single-sided board | substrate, The sun of Claim 3 characterized by the above-mentioned. Battery device. 前記基板は、矩形状を有し、対向する一対の辺の中央付近に凸部を有し、２枚の前記基板を前記凸部を有する辺同士を隣接して配置したときに、前記凸部同士が衝突しないように、前記基板の対向する一対の辺上に前記凸部が形成され、
前記配線パターンの集線部は、前記凸部上に形成されることを特徴とする請求項３に記載の太陽電池装置。 The substrate has a rectangular shape, has a convex portion near the center of a pair of opposing sides, and when the two substrates are arranged adjacent to each other having the convex portion, the convex portion The protrusions are formed on a pair of opposing sides of the substrate so that they do not collide with each other,
The solar cell device according to claim 3, wherein the concentrating portion of the wiring pattern is formed on the convex portion. 前記基板は、矩形状を有し、矩形状の一辺の両端部に凸部を有し、
前記配線パターンの集線部は、前記凸部上に形成されることを特徴とする請求項３に記載の太陽電池装置。 The substrate has a rectangular shape, and has convex portions at both ends of one side of the rectangular shape,
The solar cell device according to claim 3, wherein the concentrating portion of the wiring pattern is formed on the convex portion. 前記基板は、前記太陽電池セルの電極形成位置に対応して設けられたスルーホールを有し、前記太陽電池セルの載置面でない裏面に前記配線パターンを形成した両面基板であり、前記配線パターンの集線部は、前記両面基板の裏面の周縁部に設けられることを特徴とする請求項１または２に記載の太陽電池装置。   The substrate is a double-sided substrate having a through hole provided corresponding to an electrode formation position of the solar battery cell, and forming the wiring pattern on a back surface that is not a mounting surface of the solar battery cell, the wiring pattern The solar cell device according to claim 1, wherein the concentrating portion is provided at a peripheral edge portion of the back surface of the double-sided substrate. 前記太陽電池装置を複数直列に配置し、隣接する太陽電池装置の異なる極性の電極の配線パターンの集線部同士をリード線で接合することを特徴とする請求項３〜７のいずれか１つに記載の太陽電池装置。   A plurality of the solar cell devices are arranged in series, and the concentrating portions of the wiring patterns of the electrodes having different polarities of the adjacent solar cell devices are joined by lead wires. The solar cell device described.
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