JP2002359388A - Solar cell device - Google Patents
Solar cell deviceInfo
- Publication number
- JP2002359388A JP2002359388A JP2002154639A JP2002154639A JP2002359388A JP 2002359388 A JP2002359388 A JP 2002359388A JP 2002154639 A JP2002154639 A JP 2002154639A JP 2002154639 A JP2002154639 A JP 2002154639A JP 2002359388 A JP2002359388 A JP 2002359388A
- Authority
- JP
- Japan
- Prior art keywords
- solar cell
- receiving surface
- light receiving
- inner lead
- surface side
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 claims description 9
- 238000005336 cracking Methods 0.000 abstract description 7
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 abstract description 4
- 239000011889 copper foil Substances 0.000 abstract description 4
- 230000008719 thickening Effects 0.000 abstract 1
- 229910000679 solder Inorganic materials 0.000 description 10
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 230000007423 decrease Effects 0.000 description 6
- 238000004806 packaging method and process Methods 0.000 description 6
- 239000011347 resin Substances 0.000 description 6
- 229920005989 resin Polymers 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 5
- 238000009792 diffusion process Methods 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- 229910052709 silver Inorganic materials 0.000 description 5
- 239000004332 silver Substances 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 238000005304 joining Methods 0.000 description 4
- 238000010030 laminating Methods 0.000 description 4
- XHXFXVLFKHQFAL-UHFFFAOYSA-N phosphoryl trichloride Chemical compound ClP(Cl)(Cl)=O XHXFXVLFKHQFAL-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 239000011230 binding agent Substances 0.000 description 2
- 230000008602 contraction Effects 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- RLOWWWKZYUNIDI-UHFFFAOYSA-N phosphinic chloride Chemical compound ClP=O RLOWWWKZYUNIDI-UHFFFAOYSA-N 0.000 description 2
- 238000005268 plasma chemical vapour deposition Methods 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 238000005476 soldering Methods 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- JBRZTFJDHDCESZ-UHFFFAOYSA-N AsGa Chemical compound [As]#[Ga] JBRZTFJDHDCESZ-UHFFFAOYSA-N 0.000 description 1
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 125000004437 phosphorous atom Chemical group 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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
Landscapes
- Photovoltaic Devices (AREA)
Abstract
(57)【要約】
【課題】 セル面積の増大に伴って発生する直列抵抗の
増大と、その対抗策であるバスバー部の銅箔を厚くする
ことによって発生するセル割れの問題を解消した太陽電
池装置を提供することを目的とする。
【解決手段】 透光性パネルの裏面側にインナーリード
４、５で接続された太陽電池素子１を配置した太陽電池
装置であって、上記太陽電池素子１の受光面側と反受光
面側にインナーリード４、５を接続し、そのインナーリ
ード４、５同士を接続することによって配線する。
(57) [Summary] [Problem] To solve the problem of the increase in series resistance caused by the increase of the cell area and the problem of cell cracking caused by thickening the copper foil of the bus bar as a countermeasure. It is intended to provide a device. SOLUTION: The solar cell device in which a solar cell element 1 connected by inner leads 4 and 5 is disposed on the back side of a translucent panel, wherein the solar cell element 1 has a light receiving surface side and an opposite light receiving surface side. Wiring is performed by connecting the inner leads 4 and 5 and connecting the inner leads 4 and 5 to each other.
Description
【０００１】[0001]
【発明の属する技術分野】本発明は太陽電池装置に関
し、特に複数の太陽電池素子がインナーリードによって
接続された太陽電池装置に関する。The present invention relates to a solar cell device, and more particularly to a solar cell device in which a plurality of solar cell elements are connected by inner leads.
【０００２】[0002]
【従来の技術】従来の太陽電池装置のインナーリードの
配線を図４ないし図６を用いて説明する。図４ないし図
６中、１は太陽電池素子、２は受光面側電極、３は反受
光面側電極である。2. Description of the Related Art Wiring of inner leads of a conventional solar cell device will be described with reference to FIGS. 4 to 6, reference numeral 1 denotes a solar cell element, 2 denotes a light receiving surface side electrode, and 3 denotes an anti-light receiving surface side electrode.
【０００３】太陽電池素子１は例えばＰ型シリコン基板
の受光面側にＮ型領域、反受光面側にＰ型領域を形成し
て構成されている。Ｎ型領域の表面には受光面側電極２
が設けられ、Ｐ型領域の表面には反受光面側電極３が設
けられている。この受光面側電極２は、銀と半田から成
るインナーリード接続用のバスバー部と、銀と半田から
成る集電用のフィンガー部とから構成される。また、反
受光面側電極３も銀と半田から成るインナーリード接続
用のバスバー部と、アルミニウムから成る集電用電極と
から構成される。[0003] The solar cell element 1 is formed, for example, by forming an N-type region on the light-receiving surface side of a P-type silicon substrate and a P-type region on the opposite light-receiving surface side. The light receiving surface side electrode 2 is provided on the surface of the N-type region.
Are provided, and an anti-light receiving surface side electrode 3 is provided on the surface of the P-type region. The light-receiving-surface-side electrode 2 includes a bus bar portion made of silver and solder for connecting inner leads, and a current collecting finger portion made of silver and solder. The anti-light-receiving-surface-side electrode 3 also includes an inner lead connection busbar portion made of silver and solder, and a current collecting electrode made of aluminum.
【０００４】複数の太陽電池素子を接続するには、イン
ナーリード６の一方端を受光面側電極２のバスバー部上
の略全長にわたって配設し、その複数個所を受光面側電
極２のバスバー部と接合することによって受光面側電極
２に接続するとともに、インナーリード６の他方端を、
反受光面側電極３のバスバー部の略全長にわたって配設
し、その複数個所を反受光面側電極３のバスバー部と接
合することによって反受光面側電極３に接続する。In order to connect a plurality of solar cell elements, one end of the inner lead 6 is disposed over substantially the entire length of the bus bar portion of the light receiving surface side electrode 2, and a plurality of locations are provided at the bus bar portion of the light receiving surface side electrode 2. And the other end of the inner lead 6 is connected to the light receiving surface side electrode 2 by joining
The bus bar portion of the anti-light receiving surface side electrode 3 is disposed over substantially the entire length, and a plurality of locations are connected to the anti-light receiving surface side electrode 3 by joining the bus bar portion of the anti-light receiving surface side electrode 3.
【０００５】このとき複数の太陽電池素子を接続する方
法は、インナーリード６の一方端を例えば受光面側電極
２のバスバー部上の略全長にわたって配設し、その複数
個所を受光面側電極２のバスバー部と接合することによ
って受光面側電極２に接続した後、インナーリード６の
他方端を、隣接する太陽電池素子の反受光面側電極３の
バスバー部の略全長にわたって配設し、その複数個所を
反受光面側電極３のバスバー部と接合することによって
反受光面側電極３に接続したとする。この時には先ず太
陽電池素子の受光面側を上向きに配置し、インナーリー
ド６を受光面側電極２に接続し、その後他端を接続予定
の隣接する太陽電池素子の反受光面側電極３のバスバー
部の略全長の長さを予定して、インナーリードを切断す
る。次にその隣接する太陽電池素子の反受光面側電極３
のバスバー部の略全長の長さ分インナーリードがはみ出
した太陽電池を表裏反転させ、隣接する太陽電池素子の
反受光面側に、はみ出したインナーリードを配置し接続
する。At this time, a method of connecting a plurality of solar cell elements is such that one end of the inner lead 6 is disposed, for example, over substantially the entire length of the bus bar portion of the light receiving surface side electrode 2, and a plurality of locations are connected to the light receiving surface side electrode 2. After connecting to the light receiving surface side electrode 2 by joining with the bus bar portion, the other end of the inner lead 6 is disposed over substantially the entire length of the bus bar portion of the anti light receiving surface side electrode 3 of the adjacent solar cell element. It is assumed that a plurality of portions are connected to the anti-light receiving surface side electrode 3 by joining the bus bar portion of the anti-light receiving surface side electrode 3. At this time, first, the light receiving surface side of the solar cell element is arranged upward, the inner lead 6 is connected to the light receiving surface side electrode 2, and then the other end is connected to the bus bar of the opposite light receiving surface side electrode 3 of the adjacent solar cell element to be connected. Cut the inner lead with the length of approximately the entire length of the part. Next, the electrode 3 on the side opposite to the light receiving surface of the adjacent solar cell element
The solar cell in which the inner lead protrudes by the length of substantially the entire length of the bus bar portion is turned upside down, and the protruding inner lead is arranged and connected to the side opposite to the light receiving surface of the adjacent solar cell element.
【０００６】[0006]
【発明が解決しようとする課題】この従来の太陽電池装
置では、太陽電池素子の面積増大に伴い、発生電流が増
加したり、受光面側電極２のバスバー部の長さ及び反受
光面側電極３のバスバー部の長さが長くなるために、直
列抵抗成分が増大して変換効率が低下するという問題が
あった。In this conventional solar cell device, as the area of the solar cell element increases, the generated current increases, the length of the bus bar portion of the light receiving surface side electrode 2 and the length of the electrode opposite to the light receiving surface side increase. Since the length of the bus bar portion of No. 3 becomes long, there is a problem that the series resistance component increases and the conversion efficiency decreases.
【０００７】変換効率の低下を防止するためには、イン
ナーリード６の断面積を増加させればよいが、受光面側
では、幅を広くすると太陽電池素子１の受光面積が減少
して変換効率の低下を招く。受光面積を減少させないよ
うにするためには、インナーリード６の厚みを厚くして
断面積を増加させなければならない。To prevent the conversion efficiency from lowering, the cross-sectional area of the inner lead 6 may be increased. On the light-receiving surface side, if the width is increased, the light-receiving area of the solar cell element 1 decreases, and the conversion efficiency decreases. Causes a decrease in In order not to reduce the light receiving area, the thickness of the inner lead 6 must be increased to increase the sectional area.
【０００８】ところが、インナーリード６が厚くなる
と、このインナーリード６をホットエアーや半田ごてで
太陽電池素子の受光面側電極２及び反受光面側電極３に
溶着する際に、このホットエアーや半田ごての熱が受光
面側電極２及び反受光面側電極３の半田まで伝わりにく
く、受光面側電極２及び反受光面側電極３とインナーリ
ード６との溶着に時間がかかり、インナーリード６の熱
膨張による伸びが大きくなる。インナーリード６が伸び
た状態で受光面側電極２及び反受光面側電極３に接続さ
れると、インナーリード６が縮む際に、太陽電池素子１
に圧縮応力が印加されて、セル割れを誘発し、歩留まり
が低下するという問題があった。また、インナーリード
６の厚みが厚くなることで、太陽電池素子１の総厚みが
増加し、後工程であるガラスと樹脂でパッケージするラ
ミネート工程等で割れるという問題があった。However, when the inner lead 6 becomes thicker, when the inner lead 6 is welded to the light-receiving side electrode 2 and the non-light-receiving side electrode 3 of the solar cell element by hot air or a soldering iron, The heat of the soldering iron is hardly transmitted to the solder of the light receiving surface side electrode 2 and the anti-light receiving surface side electrode 3, and it takes time to weld the light receiving surface side electrode 2 and the anti-light receiving surface side electrode 3 to the inner lead 6. The elongation due to thermal expansion of No. 6 increases. When the inner lead 6 is connected to the light receiving surface side electrode 2 and the non-light receiving surface side electrode 3 in a stretched state, the solar cell element 1
, A compressive stress is applied to the cells to induce cell cracking, which lowers the yield. In addition, when the thickness of the inner lead 6 is increased, the total thickness of the solar cell element 1 is increased, and there is a problem that the solar cell element 1 is broken by a laminating step of packaging with glass and resin, which is a subsequent step.
【０００９】また、従来の一方端がすでに接続され、他
方端が隣接する太陽電池素子のバスバー部の略全長の長
さ分、インナーリードがはみ出した太陽電池素子を表裏
反転させる方法では、はみ出したインナーリードがよれ
たり、曲がったりしてしまい、作業性が悪いという問題
があった。Further, in the conventional method of reversing the front and back of the solar cell element in which the inner lead protrudes by the length of substantially the entire length of the bus bar portion of the solar cell element in which one end is already connected and the other end is adjacent. There was a problem that the inner lead was twisted or bent, resulting in poor workability.
【００１０】本発明は、このような従来の問題点に鑑み
てなされたものであり、セル面積の増大に伴って発生す
る直列抵抗の増大と、その対抗策であるバスバー部の銅
箔を厚くすることによって発生するセル割れの問題を解
消すると共に、作業性の問題を解消した太陽電池装置を
提供することを目的とする。The present invention has been made in view of such a conventional problem. The present invention has been made to increase the series resistance generated as the cell area increases, and to increase the thickness of the copper foil of the bus bar portion as a countermeasure. It is an object of the present invention to provide a solar cell device that solves the problem of cell cracking caused by the above-mentioned process and the problem of workability.
【００１１】[0011]
【課題を解決するための手段】上記目的を達成するため
に、請求項１に係る発明では、透光性パネルの裏面側に
受光面側電極と反受光面側電極とを有する複数の太陽電
池素子をインナーリードで接続した太陽電池装置におい
て、前記太陽電池素子の受光面側と反受光面側に接続し
たインナーリード同士を接続する。この方法によれば、
受光面側および反受光面側電極に別々のインナーリード
を接続し、後からこれらインナーリード同士を接続する
ことによって、インナーリードの熱膨張および収縮によ
って太陽電池素子に加わる圧縮応力が、１枚の太陽電池
素子の分だけになり、隣同士の太陽電池素子が引っ張り
合うことがない。In order to achieve the above object, according to the first aspect of the present invention, a plurality of solar cells having a light receiving surface side electrode and a non-light receiving surface side electrode on the back side of a translucent panel are provided. In a solar cell device in which elements are connected by inner leads, inner leads connected to the light receiving surface side and the opposite light receiving surface side of the solar cell element are connected. According to this method,
By connecting separate inner leads to the light-receiving surface side and anti-light-receiving surface side electrodes and connecting these inner leads later, the compressive stress applied to the solar cell element due to thermal expansion and contraction of the inner leads is reduced by one sheet. It is only for the solar cell element, and the adjacent solar cell elements do not pull each other.
【００１２】また、請求項２に係る太陽電池装置では、
前記太陽電池素子の反受光面側電極に接続されたインナ
ーリードの幅を受光面側電極に接続されたインナーリー
ドの幅より広くすることにより、太陽電池素子の受光面
積の低下を防ぎ、素子特性の向上を図る。Further, in the solar cell device according to claim 2,
By making the width of the inner lead connected to the anti-light-receiving-side electrode of the solar cell element wider than the width of the inner lead connected to the light-receiving-surface-side electrode, it is possible to prevent a decrease in the light-receiving area of the solar cell element, To improve.
【００１３】さらに、請求項３に係る太陽電池装置によ
れば、前記太陽電池素子の反受光面側電極に接続された
インナーリードの厚みを受光面側電極に接続されたイン
ナーリードの厚みより薄くすることにより、太陽電池素
子の総厚みの増加を防ぎ、後工程であるガラスと樹脂で
パッケージするラミネート工程等で割れるという問題を
解消すると共に、反受光面側電極に接続されたインナー
リードの幅を受光面側電極に接続されたインナーリード
の幅より広くすることと組み合わせることによって、イ
ンナーリードの断面積を変化させることなく太陽電池素
子の受光面積を増やせるので、モジュール特性の向上が
図れる。Further, according to the solar cell device of the third aspect, the thickness of the inner lead connected to the opposite light receiving surface electrode of the solar cell element is smaller than the thickness of the inner lead connected to the light receiving surface side electrode. By doing so, it is possible to prevent the total thickness of the solar cell element from increasing, to eliminate the problem of cracking in a later step such as a laminating step of packaging with glass and resin, and to reduce the width of the inner lead connected to the electrode on the side opposite to the light receiving surface. By combining this with the width of the inner lead connected to the light receiving surface side electrode, the light receiving area of the solar cell element can be increased without changing the cross-sectional area of the inner lead, so that the module characteristics can be improved.
【００１４】[0014]
【発明の実施の形態】以下、本発明に係る太陽電池装置
の実施形態を添付図面に基づき詳細に説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the solar cell device according to the present invention will be described below in detail with reference to the accompanying drawings.
【００１５】図１ないし図３は本発明の太陽電池装置を
説明するための図であり、１は太陽電池素子、２は受光
面側電極、３は反受光面側電極、４は受光面側インナー
リード、５は反受光面側インナーリードである。1 to 3 are views for explaining a solar cell device according to the present invention, wherein 1 is a solar cell element, 2 is a light-receiving surface side electrode, 3 is an anti-light-receiving side electrode, and 4 is a light-receiving surface side. Inner leads 5 and 5 are inner leads on the side opposite to the light receiving surface.
【００１６】太陽電池素子１は、厚み０．３ｍｍ程度の
単結晶シリコンや多結晶シリコンなどから成る。この太
陽電池素子１内には、Ｎ型領域とＰ型領域があり、Ｎ型
領域とＰ型領域との界面部分で半導体接合が形成され
る。このＮ型領域はＰ型のシリコン基板を拡散炉中に配
置して、オキシ塩化リン（ＰＯＣｌ3）中で加熱するこ
とによって、シリコン基板の表面部全体にリン原子を拡
散させ、厚み０．３〜０．４μｍ程度に形成する。その
後に側面部と底面部の拡散層を除去する。なお、このシ
リコン基板は単結晶ガリウム砒素などにも変更できる。The solar cell element 1 is made of single-crystal silicon or polycrystalline silicon having a thickness of about 0.3 mm. The solar cell element 1 has an N-type region and a P-type region, and a semiconductor junction is formed at an interface between the N-type region and the P-type region. This N-type region is formed by placing a P-type silicon substrate in a diffusion furnace and heating the substrate in phosphorus oxychloride (POCl 3 ) to diffuse phosphorus atoms over the entire surface of the silicon substrate, thereby obtaining a thickness of 0.3%. ０．４0.4 μm. Thereafter, the diffusion layers on the side and bottom portions are removed. The silicon substrate can be changed to single crystal gallium arsenide or the like.
【００１７】太陽電池素子１の表面側には、図示されて
いないが、例えば窒化シリコン膜などから成る反射防止
膜が形成される。このような反射防止膜は例えばプラズ
マＣＶＤ法などで形成される。Although not shown, an antireflection film made of, for example, a silicon nitride film is formed on the front surface of the solar cell element 1. Such an antireflection film is formed by, for example, a plasma CVD method.
【００１８】Ｎ型領域の表面部分には、受光面側電極２
が形成されている。この受光面側電極２は、受光面側イ
ンナーリード４を接続するためのバスバー部とこのバス
バー部と交差して分岐して形成された集電用のフィンガ
ー部とから成る。バスバー部は太陽電池素子１の略全長
にわたって二本平行に形成されており、フィンガー部は
バスバー部に交差して多数本が太陽電池素子１の略全長
にわたって形成されている。バスバー部は例えば２ｍｍ
程度の幅に形成され、フィンガー部は例えば０．２ｍｍ
程度の幅に形成される。このような受光面側電極２は、
例えば銀粉末、ガラスフリット、結合剤、および溶剤か
ら成るペーストをスクリーン印刷して７００℃〜８００
℃程度の温度で焼き付け、全体を半田層で被覆すること
により形成される。A light-receiving surface side electrode 2 is
Are formed. The light-receiving-surface-side electrode 2 includes a bus bar portion for connecting the light-receiving surface-side inner lead 4 and a current-collecting finger portion formed by crossing the bus bar portion. Two busbar portions are formed substantially in parallel over the entire length of the solar cell element 1, and a large number of finger portions cross the busbar portion and are formed substantially over the entire length of the solar cell element 1. The busbar part is, for example, 2 mm
About 0.2 mm, and the finger part is, for example, 0.2 mm
It is formed to a width of about. Such a light receiving surface side electrode 2
For example, a paste composed of silver powder, glass frit, a binder, and a solvent is screen-printed at 700 ° C. to 800 ° C.
It is formed by baking at a temperature of about ° C and covering the whole with a solder layer.
【００１９】この受光面側電極２のバスバー部上には受
光面側インナーリード４をバスバー部全長もしくは複数
ポイントでホットエアーなどの熱溶着により貼り付け
る。この受光面側インナーリード４は、受光面側電極２
のバスバー部の断面積を大きくして受光面側電極２の電
気抵抗を下げるとともに、太陽電池の出力を取り出すた
めに設けるものであり、例えば幅２ｍｍ程度、厚み０．
２ｍｍ程度に形成される。On the bus bar portion of the light receiving surface side electrode 2, a light receiving surface side inner lead 4 is adhered over the entire length of the bus bar portion or a plurality of points by hot welding such as hot air. This light receiving surface side inner lead 4 is
In order to reduce the electric resistance of the light-receiving-surface-side electrode 2 by increasing the cross-sectional area of the busbar portion, and to take out the output of the solar cell, for example, the width is about 2 mm and the thickness is about 0.1 mm.
It is formed to about 2 mm.
【００２０】太陽電池素子１の反受光面側には反受光面
側電極３が設けられている。この反受光面側電極３もバ
スバー部と、このバスバー部と１ｍｍ程度重なるよう反
受光面側全面に形成される集電用電極部とから成る。An electrode 3 on the opposite side of the light receiving surface of the solar cell element 1 is provided. The anti-light-receiving-surface-side electrode 3 also includes a bus bar portion and a current-collecting electrode portion formed on the entire surface of the anti-light-receiving surface so as to overlap the bus bar portion by about 1 mm.
【００２１】この反受光面側電極３のバスバー部も、例
えば銀粉末、ガラスフリット、結合剤、および溶剤から
成るペーストをスクリーン印刷して７００℃〜８００℃
程度の温度で焼き付け、全体を半田層で被覆することに
より形成される。この反受光面側電極３のバスバー部上
には反受光面側インナーリード５をバスバー部全長もし
くは複数ポイントでホットエアーなどの熱溶着により貼
り付ける。この反受光面側インナーリード５は、反受光
面側電極３のバスバー部の断面積を大きくして反受光面
側電極３の電気抵抗を下げるとともに、太陽電池の出力
を取り出すために設けるものであり、例えば幅５ｍｍ程
度、厚み０．１ｍｍ程度に形成される。The bus bar portion of the anti-light-receiving surface side electrode 3 is also screen-printed with a paste made of, for example, silver powder, glass frit, a binder, and a solvent at 700 ° C. to 800 ° C.
It is formed by baking at about the temperature and covering the whole with a solder layer. On the busbar portion of the electrode 3 on the opposite side of the light receiving surface, an inner lead 5 on the opposite side of the light receiving surface is attached by thermal welding such as hot air over the entire length of the busbar or at a plurality of points. The anti-light-receiving side inner lead 5 is provided to reduce the electric resistance of the anti-light-receiving side electrode 3 by increasing the cross-sectional area of the bus bar portion of the anti-light-receiving side electrode 3 and to take out the output of the solar cell. For example, it is formed to have a width of about 5 mm and a thickness of about 0.1 mm.
【００２２】次に、そのインナーリード４、５同士を接
続することによって太陽電池素子同士を接続配線する。
その後、この太陽電池素子同士を接続配線したものを透
光性パネルと裏面部材との間に樹脂などを用いてパッケ
ージングすることにより、太陽電池装置を得る。Next, the solar cell elements are connected to each other by connecting the inner leads 4 and 5 to each other.
Then, the solar cell device is obtained by packaging the connection and wiring of the solar cell elements using a resin or the like between the translucent panel and the back surface member.
【００２３】この方法によれば、受光面側および反受光
面側電極２、３に個々のインナーリード４、５を別々に
接続し、後からインナーリード４、５同士を接続するこ
とによって、インナーリード４、５の熱膨張および収縮
によって太陽電池素子に加わる圧縮応力が、１枚の太陽
電池素子の分だけになり、隣同士の太陽電池素子が引っ
張り合うことがない。これにより、素子割れを回避でき
る。According to this method, the inner leads 4 and 5 are separately connected to the light-receiving surface side electrode 2 and the non-light-receiving surface side electrode 2 and 3 respectively, and the inner leads 4 and 5 are connected later. The compressive stress applied to the solar cell element by thermal expansion and contraction of the leads 4 and 5 is only for one solar cell element, and adjacent solar cell elements do not pull. Thereby, element breakage can be avoided.
【００２４】また、図３に示すように、受光面側に使用
するインナーリード４の幅を反受光面側に使用するイン
ナーリード５の幅より狭くすることにより、太陽電池素
子の受光面積の低下を防ぎ、素子特性の向上を図れる。Also, as shown in FIG. 3, the width of the inner lead 4 used on the light receiving surface side is made smaller than the width of the inner lead 5 used on the opposite light receiving surface side, thereby reducing the light receiving area of the solar cell element. Is prevented, and the element characteristics can be improved.
【００２５】さらに、反受光面側に使用するインナーリ
ード５の厚みを受光面側に使用するインナーリード４の
厚みより薄くすることにより、太陽電池素子の総厚みの
増加を防ぎ、後工程であるガラスと樹脂でパッケージす
るラミネート工程等で割れるという問題を解消すると共
に、受光面側に使用するインナーリード４の厚みを反受
光面側に使用するインナーリード５の厚みより厚くし、
受光面側に使用するインナーリード４の幅を反受光面側
に使用するインナーリード５の幅より狭くすることによ
り、インナーリードの断面積を変化させることなく、太
陽電池素子の受光面積を増やせるので、モジュール特性
の向上が図れる。Further, by making the thickness of the inner lead 5 used on the side opposite to the light receiving surface smaller than the thickness of the inner lead 4 used on the side of the light receiving surface, it is possible to prevent an increase in the total thickness of the solar cell element, which is a post-process. In addition to solving the problem of cracking in the laminating step of packaging with glass and resin, the thickness of the inner lead 4 used on the light receiving surface side is made larger than the thickness of the inner lead 5 used on the anti-light receiving surface side,
By making the width of the inner lead 4 used on the light receiving surface side smaller than the width of the inner lead 5 used on the opposite light receiving surface side, the light receiving area of the solar cell element can be increased without changing the cross-sectional area of the inner lead. In addition, the module characteristics can be improved.
【００２６】またこのインナーリード同士を接続させる
方法によれば、インナーリードの一方端を太陽電池素子
に接続した後に、太陽電池素子の表裏を反転させる際、
従来よりもインナーリードのはみ出しが少ないため、作
業性の向上が図れる。According to the method of connecting the inner leads to each other, when one end of the inner lead is connected to the solar cell element and then the solar cell element is turned over,
Since the inner leads are less protruding than before, the workability can be improved.
【００２７】なお、本発明は、上記実施形態に限定され
るものではなく、本発明の範囲内で上記実施形態に多く
の修正および変更を加えることができる。例えば電極形
状は上記にとらわれるものではないし、例えば銀などの
１種類の材料のみで形成しても構わないし、複数の材料
を組み合わせても構わない。また、インナーリードとの
接続ができれば、電極上に半田を被覆しなくても構わな
いし、接続方法も例えばホットエアーなどの熱溶着に限
定されるものではない。さらに、図１に示すように、受
光面側インナーリードと反受光面側インナーリードは、
太陽電池素子の反受光面側で接続してもよいし、太陽電
池素子の受光面側や、太陽電池素子間など他の位置で接
続しても構わない。The present invention is not limited to the above embodiment, and many modifications and changes can be made to the above embodiment within the scope of the present invention. For example, the shape of the electrode is not limited to the above, and may be formed of only one kind of material such as silver, or may be a combination of a plurality of materials. Further, as long as the connection with the inner lead can be made, the electrode does not have to be coated with solder, and the connection method is not limited to thermal welding such as hot air. Further, as shown in FIG. 1, the light-receiving surface side inner lead and the non-light-receiving surface side inner lead
The connection may be made on the side opposite to the light receiving surface of the solar cell element, or on another side such as between the light receiving surface of the solar cell element and between the solar cell elements.
【００２８】[0028]
【実施例】以下、本発明の実施例を示す。シリコン基板
として１５ｃｍ角で厚さ０．３ｍｍ、比抵抗１．５Ω・
ｃｍのＰ型基板を準備した。そして熱拡散法でオキシ塩
化リン（ＰＯＣｌ3）を拡散源として、深さ０．５μｍ
のＮ型拡散層を形成した。Embodiments of the present invention will be described below. 15cm square, 0.3mm thick, specific resistance 1.5Ω
cm of a P-type substrate was prepared. Then, a thermal diffusion method using phosphorus oxychloride (POCl 3 ) as a diffusion source and a depth of 0.5 μm
Was formed.
【００２９】次に、表面にプラズマＣＶＤ法で窒化シリ
コンの反射防止膜を８００Åの厚さで形成した後、拡散
層を分離した。Next, an antireflection film of silicon nitride was formed on the surface to a thickness of 800 ° by plasma CVD, and then the diffusion layer was separated.
【００３０】受光面側インナーリードを接続するための
バスバー部とこのバスバー部と交差して分岐して形成さ
れた集電用のフィンガー部からなる受光面側電極と、反
受光面側インナーリードを接続するためのバスバー部を
銀ペーストで、またこの反受光面側バスバー部と１ｍｍ
程度重なるよう反受光面側全面に形成される集電用電極
部をアルミニウムペーストを用いてスクリーンプリント
し、７５０℃の温度で焼き付けた後、２００℃のはんだ
浴槽に上記基板１を浸漬して引き上げることで、全体を
半田層で被覆した。A busbar portion for connecting the light-receiving surface side inner lead, a light-receiving surface-side electrode composed of a current-collecting finger portion that is formed by crossing the busbar portion, and an anti-light-receiving surface-side inner lead. The busbar portion for connection is made of silver paste, and the busbar portion on the opposite side of the light receiving surface is 1 mm.
The electrode for current collection formed on the entire surface opposite to the light receiving surface is screen-printed using an aluminum paste so as to be overlapped to a certain extent, baked at a temperature of 750 ° C., and then immersed in the solder bath at 200 ° C. and pulled up. Thus, the whole was covered with the solder layer.
【００３１】この反受光面側電極のバスバー部上に、幅
５ｍｍ、厚み０．１ｍｍの銅箔を半田コートした反受光
面側インナーリードをバスバー部全長にわたってホット
エアーの熱溶着により貼り付けた。また、受光面側電極
のバスバー部上には幅２ｍｍ、厚み０．２ｍｍの受光面
側インナーリードをバスバー部全長にわたってホットエ
アーの熱溶着で貼り付けた。次に、そのインナーリード
同士を図１に示すように太陽電池素子の反受光面側で接
続することによって太陽電池素子同士を接続配線した。
その後、この太陽電池素子同士を接続配線したものを透
光性パネルと裏面部材との間に樹脂などを用いてパッケ
ージングすることにより、太陽電池装置を得た。On the anti-light-receiving surface side electrode, an anti-light-receiving side inner lead coated with a copper foil having a width of 5 mm and a thickness of 0.1 mm by solder was attached by hot air thermal welding over the entire length of the bus bar portion. Also, a light-receiving-surface-side inner lead having a width of 2 mm and a thickness of 0.2 mm was attached to the busbar portion of the light-receiving-surface-side electrode by hot air heat welding over the entire length of the busbar portion. Next, as shown in FIG. 1, the inner leads were connected to each other on the side opposite to the light receiving surface of the solar cell element, thereby connecting and wiring the solar cell elements.
Then, the solar cell device was obtained by packaging the connection and wiring of the solar cell elements using a resin or the like between the translucent panel and the back surface member.
【００３２】この太陽電池装置のインナーリード接続後
の製造工程における素子割れの発生率およびモジュール
の光電変換効率を従来の幅２ｍｍ、厚み０．２ｍｍの銅
箔を用いた方法と比較して表１に示す。The rate of occurrence of element cracking and the photoelectric conversion efficiency of the module in the manufacturing process after the inner lead connection of this solar cell device were compared with those of a conventional method using a copper foil having a width of 2 mm and a thickness of 0.2 mm. Shown in
【００３３】[0033]
【表１】 [Table 1]
【００３４】表１に示すように、本発明によれば、素子
割れの発生率が７分の１程度減少すると共に、モジュー
ル変換効率は１３．８％から１４．２％に向上した。As shown in Table 1, according to the present invention, the rate of occurrence of element cracks was reduced by about 1/7, and the module conversion efficiency was improved from 13.8% to 14.2%.
【００３５】[0035]
【発明の効果】本発明によれば、受光面側および反受光
面側電極に個々のインナーリードを別々に接続し、後か
らインナーリード同士を接続することによって、インナ
ーリードの熱膨張および収縮によって太陽電池素子に加
わる圧縮応力が、１枚の太陽電池素子の分だけになり、
隣同士の太陽電池素子が引っ張り合うことがない。これ
により、素子割れを回避できる。According to the present invention, the individual inner leads are separately connected to the light-receiving surface side electrode and the opposite light-receiving surface side electrode, and the inner leads are connected later. The compressive stress applied to the solar cell element is only for one solar cell element,
Adjacent solar cell elements do not pull each other. Thereby, element breakage can be avoided.
【００３６】また、受光面側に使用するインナーリード
の幅を反受光面側に使用するインナーリードの幅より狭
くすることにより、太陽電池素子の受光面積の低下を防
ぎ、素子特性の向上を図れる。Further, by making the width of the inner lead used on the light receiving surface side smaller than the width of the inner lead used on the opposite light receiving surface side, a decrease in the light receiving area of the solar cell element can be prevented, and the element characteristics can be improved. .
【００３７】さらに、反受光面側に使用するインナーリ
ードの厚みを受光面側に使用するインナーリードの厚み
より薄くすることにより、太陽電池素子の総厚みの増加
を防ぎ、後工程であるガラスと樹脂でパッケージするラ
ミネート工程等で割れるという問題を解消すると共に、
受光面側に使用するインナーリードの厚みを反受光面側
に使用するインナーリードの厚みより厚くし、受光面側
に使用するインナーリードの幅を反受光面側に使用する
インナーリードの幅より狭くすることにより、インナー
リードの断面積を変化させることなく、太陽電池素子の
受光面積を増やせるのでモジュール特性の向上が図れ
る。Further, by making the thickness of the inner lead used on the side opposite to the light receiving surface smaller than the thickness of the inner lead used on the side of the light receiving surface, it is possible to prevent the total thickness of the solar cell element from being increased, and to reduce In addition to solving the problem of cracking in the laminating process of packaging with resin,
Make the thickness of the inner lead used on the light receiving surface side thicker than the thickness of the inner lead used on the anti-light receiving surface side, and make the width of the inner lead used on the light receiving surface side smaller than the width of the inner lead used on the anti-light receiving surface side By doing so, the light receiving area of the solar cell element can be increased without changing the cross-sectional area of the inner lead, so that the module characteristics can be improved.
【図面の簡単な説明】[Brief description of the drawings]
【図１】本発明に係る太陽電池を説明するための断面図
であるFIG. 1 is a cross-sectional view illustrating a solar cell according to the present invention.
【図２】本発明に係る太陽電池の受光面側電極に接続さ
れたインナーリード部を説明するための図であるFIG. 2 is a view for explaining an inner lead portion connected to a light-receiving surface side electrode of the solar cell according to the present invention.
【図３】本発明に係る太陽電池の反受光面側電極に接続
されたインナーリード部を説明するための図であるFIG. 3 is a view for explaining an inner lead portion connected to the electrode on the side opposite to the light receiving surface of the solar cell according to the present invention.
【図４】従来の太陽電池を説明するための断面図であるFIG. 4 is a cross-sectional view illustrating a conventional solar cell.
【図５】従来の太陽電池の受光面側電極に接続されたイ
ンナーリード部を説明するための図であるFIG. 5 is a view for explaining an inner lead portion connected to a light-receiving-surface-side electrode of a conventional solar cell.
【図６】従来の太陽電池の反受光面側電極に接続された
インナーリード部を説明するための図であるFIG. 6 is a view for explaining an inner lead portion connected to an electrode opposite to a light receiving surface of a conventional solar cell.
１：太陽電池素子、２：受光面側電極、３：反受光面側
電極、４：受光面側インナーリード、５：反受光面側イ
ンナーリード、６：インナーリード1: solar cell element, 2: light receiving side electrode, 3: anti-light receiving side electrode, 4: light receiving side inner lead, 5: anti-light receiving side inner lead, 6: inner lead
───────────────────────────────────────────────────── フロントページの続き (72)発明者 白沢 勝彦 滋賀県八日市市蛇溝町長谷野1166番地の６ 京セラ株式会社滋賀工場八日市ブロック 内 Ｆターム(参考） 5F051 AA02 BA17 CB20 DA03 EA02 FA14 FA15 GA04 HA03 JA02 JA05 JA06 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Katsuhiko Shirasawa 1166, Haseno, Snake-cho, Yokaichi City, Shiga Prefecture F-term (reference) 5F051 AA02 BA17 CB20 DA03 EA02 FA14 FA15 GA04 HA03 JA02 JA05 JA06
Claims (3)
反受光面側電極とを有する複数の太陽電池素子をインナ
ーリードで接続した太陽電池装置において、前記太陽電
池素子の受光面側電極と反受光面側電極に別々のインナ
ーリードを接続し、この別々のインナーリード同士を接
続したことを特徴とする太陽電池装置。1. A solar cell device in which a plurality of solar cell elements having a light-receiving surface side electrode and an anti-light-receiving surface side electrode on the back side of a translucent panel are connected by inner leads. A solar cell device, wherein separate inner leads are connected to the electrode and the electrode opposite to the light receiving surface, and the separate inner leads are connected to each other.
続されたインナーリードの幅が受光面側電極に接続され
たインナーリードの幅より広いことを特徴とする請求項
１に記載の太陽電池装置。2. The solar cell according to claim 1, wherein the width of the inner lead connected to the electrode on the opposite side of the light receiving surface of the solar cell element is wider than the width of the inner lead connected to the electrode on the opposite side of the light receiving surface. Battery device.
続されたインナーリードの厚みが受光面側電極に接続さ
れたインナーリードの厚みより薄い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 method according to claim 1, wherein the thickness of an inner lead connected to the electrode on the opposite side of the light receiving surface of the solar cell element is smaller than the thickness of the inner lead connected to the electrode on the opposite side of the light receiving surface. Solar cell device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002154639A JP2002359388A (en) | 2002-05-28 | 2002-05-28 | Solar cell device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002154639A JP2002359388A (en) | 2002-05-28 | 2002-05-28 | Solar cell device |
Related Parent Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2000297619A Division JP4458651B2 (en) | 2000-09-28 | 2000-09-28 | Solar cell device |
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