WO2013042683A1 - Solar cell module - Google Patents

Solar cell module Download PDF

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Publication number
WO2013042683A1
WO2013042683A1 PCT/JP2012/073919 JP2012073919W WO2013042683A1 WO 2013042683 A1 WO2013042683 A1 WO 2013042683A1 JP 2012073919 W JP2012073919 W JP 2012073919W WO 2013042683 A1 WO2013042683 A1 WO 2013042683A1
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Prior art keywords
solar cell
electrode
solar
cell module
finger
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PCT/JP2012/073919
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French (fr)
Japanese (ja)
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修司 福持
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三洋電機株式会社
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Publication of WO2013042683A1 publication Critical patent/WO2013042683A1/en

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0516—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module specially adapted for interconnection of back-contact solar cells
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/048—Encapsulation of modules
    • H01L31/0481—Encapsulation of modules characterised by the composition of the encapsulation material
    • 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

Definitions

  • the present invention relates to a solar cell module.
  • Patent Document 1 describes, as an example, a solar cell module including a solar cell string having a plurality of solar cells arranged along one direction.
  • the finger portions of the solar cell electrodes extend along one direction which is the arrangement direction of the solar cells.
  • Solar cells adjacent in one direction are electrically connected by a wiring material. That is, the solar cells electrically connected by the wiring material are arranged along the direction in which the finger portions extend.
  • the solar cell module according to the present invention includes first and second solar cells and a wiring material.
  • the first and second solar cells are arranged at intervals along a direction inclined with respect to one direction.
  • the wiring member electrically connects the first solar cell and the second solar cell.
  • Each of the first and second solar cells includes a photoelectric conversion unit, an electrode on one conductivity type side, and an electrode on the other conductivity type side.
  • the electrode on one conductivity type side and the electrode on the other conductivity type side are arranged on one main surface of the photoelectric conversion unit.
  • the electrode on one conductivity type side and the electrode on the other conductivity type side each include a plurality of finger portions extending along one direction. Both the finger portion located on the most solar cell side of the first solar cell and the finger portion located on the most solar cell side of the second solar cell are one conductivity type. Included in the side electrode.
  • a solar cell module having improved output characteristics can be provided.
  • FIG. 1 is a schematic cross-sectional view of a solar cell module according to an embodiment of the present invention.
  • FIG. 2 is a schematic back view of a solar cell module according to an embodiment of the present invention.
  • FIG. 3 is a schematic rear view of the solar cell in one embodiment of the present invention.
  • FIG. 4 is a schematic back view of a portion of a solar cell string in one embodiment of the present invention.
  • FIG. 5 is a schematic cross-sectional view of the wiring member taken along line VV in FIG.
  • FIG. 6 is a schematic rear view of a part of a solar cell string in a modified example.
  • the solar cell module 1 includes a plurality of solar cell strings 10. As shown in FIG. 1, the plurality of solar cell strings 10 are arranged between a first protection member 11 located on the light receiving surface side and a second protection member 12 located on the back surface side. A sealing layer 13 is provided between the first protective member 11 and the second protective member 12. The plurality of solar cell strings 10 are sealed by the sealing layer 13.
  • first and second protective members 11 and 12 has flexibility. More preferably, one of the first and second protection members 11 and 12 has flexibility and the other does not have flexibility.
  • first protection member 11 is configured by a rigid body that does not have flexibility
  • second protection member 12 is configured by a member that has flexibility.
  • the first protective member 11 can be made of a translucent member such as a glass substrate or a resin substrate, for example.
  • the second protective member 12 can be constituted by, for example, a resin sheet, a resin sheet with a metal foil interposed therebetween, a glass substrate, a resin substrate, or the like.
  • the sealing layer 13 can be made of, for example, a resin such as ethylene / vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyethylene (PE), polyurethane (PU), or the like.
  • EVA ethylene / vinyl acetate copolymer
  • PVB polyvinyl butyral
  • PE polyethylene
  • PU polyurethane
  • the sealing layer 13 preferably contains a non-crosslinkable resin.
  • the plurality of solar cell strings 10 are arranged at intervals along the y direction.
  • the plurality of solar cell strings 10 includes a plurality of solar cells 20 arranged at intervals along the x direction perpendicular to the y direction.
  • solar cells 20 adjacent in the x direction are electrically connected by a wiring material 31.
  • the solar cells 20 included in the solar cell string 10 are electrically connected by the wiring member 31.
  • the adjacent solar cell strings 10 are electrically connected by connecting the solar cells 20 located at the end portions in the x direction of the adjacent solar cell strings 10 by the wiring member 32.
  • the solar cell 20 includes a photoelectric conversion unit 23, a first electrode 21 that is an electrode on one conductivity type side, and a second electrode 22 that is an electrode on the other conductivity type side.
  • the photoelectric conversion unit 23 is not particularly limited as long as it generates carriers such as holes and electrons when receiving light.
  • the photoelectric conversion part 23 can use a silicon substrate, for example.
  • the photoelectric conversion unit 23 has a first main surface and a second main surface 23a.
  • the first electrode 21 and the second electrode 22 are disposed on the second main surface 23a. Therefore, the solar cell 20 is a back junction solar cell.
  • Each of the first electrode 21 and the second electrode 22 has a plurality of finger portions 21a and 22a.
  • Each of the plurality of finger portions 21a and 22a extends along the y direction.
  • the plurality of solar cells 20 are inclined with respect to the y direction, which is the direction in which the finger portions 21a and 22a extend, specifically, in a direction perpendicular to the y direction. They are arranged at intervals along a certain x direction.
  • the plurality of finger portions 21a and 22a are alternately arranged at intervals along the x direction perpendicular to the y direction.
  • the first electrode 21 and the second electrode 22 further include bus bar portions 21b and 22b to which a plurality of finger portions 21a and 22a are electrically connected.
  • the bus bar portion 21b of one solar cell of the solar cells 20 adjacent in the y direction and the bus bar portion 22b of the other solar cell face each other in the y direction.
  • the first and second electrodes may be bus bar-less electrodes that do not have a bus bar portion and are configured by a plurality of finger portions.
  • tilt includes vertical.
  • the finger portion located on the outermost side in the x direction of the solar cell 20 is the finger portion 21 a included in the first electrode 21.
  • the first electrode 21 includes both the finger portion located closest to the first electrode 21.
  • the finger portion 21a located on the most other solar cell 20 side of one solar cell 20 and the finger portion 21a located on the most solar cell 20 side of the other solar cell 20 are in the y direction. They are opposed to each other in an inclined direction, specifically in the x direction perpendicular to the y direction.
  • the wiring member 31 includes a wiring member body 31a, a wiring 31b, and an insulating layer 31c.
  • the wiring material main body 31a is comprised by insulating members, such as a resin film, for example.
  • the wiring 31b is arranged on the wiring material body 31a.
  • the wiring 31b is electrically connected to the finger portion 21a of one solar cell 20, and is electrically connected to the finger portion 22a of the solar cell 20 adjacent to the one solar cell 20 in the x direction. It is connected.
  • the wiring 31b is electrically insulated from the second electrode 22 of one solar cell 20 and the first electrode 21 of another solar cell 20 by an insulating layer 31c.
  • the adhesive layer can be composed of, for example, solder, a cured product of a resin adhesive, a cured product of a resin adhesive in which a conductive material is dispersed and mixed, and the like.
  • the wiring member 32 that electrically connects the adjacent solar cell strings 10 has the same configuration as the wiring member 31 and is fixed by an adhesive layer.
  • each solar cell string solar cells are arranged along the direction in which the finger portions extend, and the solar cells adjacent in the direction in which the finger portions extend are electrically connected to each other by a wiring material. More specifically, the bus bar portion located on the outermost side in the direction perpendicular to the direction in which the finger portions extend is provided to be connected to the plurality of finger portions, and the bus bar portions of adjacent solar cells are connected to each other by the wiring material It is connected.
  • the back junction type solar cell is not uniform in strength in the direction perpendicular to the direction in which the fingers extend.
  • the solar cell when a thin wiring member is arranged in the direction in which the finger portion extends, the solar cell may be bent with the finger portion direction as an axis when modularized, and the solar cell may break. Furthermore, when the wiring material is made thinner, the contact area between the bus bar portion and the wiring material is reduced, resulting in a problem that the resistance is increased.
  • the solar cell 20 adjacent to the direction inclined with respect to the y direction that is the direction in which the finger portions 21a and 22a extend, specifically, the x direction perpendicular to the y direction is the wiring material. 31 is electrically connected. More specifically, the wiring material 31 is connected to the finger portions 21a and 22a. For this reason, even if it is a case where a wiring material is made thin in the direction where a finger part extends, the crack of the back junction type solar cell which arises when modularizing can be controlled. Moreover, it can suppress that the contact area of the finger parts 21a and 22a and the wiring material 31 becomes small, and resistance becomes high. For this reason, it becomes possible to use the thin wiring material 31 in the extending direction of the finger portions.
  • the second protective member 13 can use a plurality of layers, and can easily reflect and scatter light incident on the light receiving surface side member of the second protective member 13, and generally reflects light.
  • a second protective member 13 having a member that can be scattered is used. For this reason, in the solar cell module 1, since light can be scattered and light can reenter the solar cell 20, better photoelectric conversion efficiency can be obtained.
  • the 2nd protection member 13 does not have a member which has a member which can reflect and scatter light, the structure which can color the sealing layer 13 in white etc. and can scatter light By doing so, the same effect can be obtained.
  • the example which electrically connected the solar cells 20 located in each edge part of the adjacent solar cell string 10 with the wiring material 32 via the contact bonding layer was demonstrated. More specifically, of the solar cells 20 positioned at the end portions of the adjacent solar cell strings 10, the first electrode 21 of one solar cell 20 and the second electrode 22 of the other solar cell Are connected using a wiring member 32. As a result, the wiring members can be arranged without overlapping each other. In addition, the connection area between the first electrode 21 or the second electrode 22 of the solar cell and the wiring of the wiring member 32 can be increased, and the connection resistance can be reduced. Furthermore, the wiring material 32 can be made thin while suppressing an increase in resistance of the wiring itself made of a metal such as copper.
  • the solar cells 20 constituting the solar cell string 10 are arranged along a direction perpendicular to the direction in which the finger portions 21a and 22a extend.
  • the present invention is not limited to this configuration.
  • the solar cells 20 that are electrically connected by the wiring member 31 may be arranged along a direction that is oblique to the direction in which the finger portions 21a and 22a extend. Even in that case, the same effect as the present embodiment can be obtained.
  • the solar cell module 1 includes a plurality of solar cell strings 10 .
  • the present invention is not limited to this configuration.
  • the solar cell module according to the present invention is particularly limited as long as it has at least two solar cells arranged in a direction inclined with respect to the extending direction of the finger portions and electrically connected by the wiring member. Not.

Abstract

Provided is a solar cell module having improved output characteristics. A solar cell module (1) is provided with first and second solar cells (20), and a wiring material (31). The first and second solar cells (20) are disposed at an interval in the direction tilted with respect to one direction. Each of the first and second solar cells (20) has a photoelectric conversion section (23), and one conductivity-type electrode (21) and an other conductivity-type electrode (22), which are disposed on one main surface (23a) of the photoelectric conversion section (23). The one conductivity-type electrode (21) and the other conductivity-type electrode (22) respectively include a plurality of finger sections (21a, 22a) that extend in the one direction. Both the finger section of the first solar cell (20), said finger section being positioned closest to the second solar cell (20) side, and the finger section of the second solar cell (20), said finger section being positioned closest to the first solar cell (20) side are included in the one conductivity-type electrode (21).

Description

太陽電池モジュールSolar cell module
　本発明は、太陽電池モジュールに関する。 The present invention relates to a solar cell module.
　近年、環境負荷の小さなエネルギー源として、配線材により電気的に接続された複数の太陽電池を備える太陽電池モジュールが注目されている。特許文献１には、その一例として、一の方向に沿って配されている複数の太陽電池を有する太陽電池ストリングを備える太陽電池モジュールが記載されている。特許文献１に記載の太陽電池モジュールでは、太陽電池の電極のフィンガー部は、太陽電池の配列方向である一の方向に沿って延びている。一の方向において隣り合う太陽電池同士が配線材により電気的に接続されている。即ち、配線材により電気的に接続されている太陽電池は、フィンガー部の延びる方向に沿って配列されている。 In recent years, a solar cell module including a plurality of solar cells electrically connected by wiring materials has attracted attention as an energy source with a small environmental load. Patent Document 1 describes, as an example, a solar cell module including a solar cell string having a plurality of solar cells arranged along one direction. In the solar cell module described in Patent Document 1, the finger portions of the solar cell electrodes extend along one direction which is the arrangement direction of the solar cells. Solar cells adjacent in one direction are electrically connected by a wiring material. That is, the solar cells electrically connected by the wiring material are arranged along the direction in which the finger portions extend.
特開２００９－２６６８４８号公報JP 2009-266848 A
　特許文献１に記載の太陽電池ストリングを一の方向に対して傾斜した他の方向に沿って複数設けた太陽電池モジュールでは、出力特性が低くなる場合がある。 In a solar cell module in which a plurality of solar cell strings described in Patent Document 1 are provided along another direction inclined with respect to one direction, output characteristics may be lowered.
　本発明に係る太陽電池モジュールは、第１及び第２の太陽電池と、配線材とを備えている。第１及び第２の太陽電池は、一の方向に対して傾斜した方向に沿って間隔をおいて配されている。配線材は、第１の太陽電池と第２の太陽電池とを電気的に接続している。第１及び第２の太陽電池のそれぞれは、光電変換部と、一導電型側の電極及び他導電型側の電極とを有する。一導電型側の電極及び他導電型側の電極は、光電変換部の一主面の上に配されている。一導電型側の電極及び他導電型側の電極は、それぞれ、一の方向に沿って延びる複数のフィンガー部を含む。第１の太陽電池の最も第２の太陽電池側に位置しているフィンガー部と、第２の太陽電池の最も第１の太陽電池側に位置しているフィンガー部との両方が、一導電型側の電極に含まれる。 The solar cell module according to the present invention includes first and second solar cells and a wiring material. The first and second solar cells are arranged at intervals along a direction inclined with respect to one direction. The wiring member electrically connects the first solar cell and the second solar cell. Each of the first and second solar cells includes a photoelectric conversion unit, an electrode on one conductivity type side, and an electrode on the other conductivity type side. The electrode on one conductivity type side and the electrode on the other conductivity type side are arranged on one main surface of the photoelectric conversion unit. The electrode on one conductivity type side and the electrode on the other conductivity type side each include a plurality of finger portions extending along one direction. Both the finger portion located on the most solar cell side of the first solar cell and the finger portion located on the most solar cell side of the second solar cell are one conductivity type. Included in the side electrode.
　本発明によれば、改善された出力特性を有する太陽電池モジュールを提供することができる。 According to the present invention, a solar cell module having improved output characteristics can be provided.
図１は、本発明の一実施形態に係る太陽電池モジュールの略図的断面図である。FIG. 1 is a schematic cross-sectional view of a solar cell module according to an embodiment of the present invention. 図２は、本発明の一実施形態に係る太陽電池モジュールの略図的裏面図である。FIG. 2 is a schematic back view of a solar cell module according to an embodiment of the present invention. 図３は、本発明の一実施形態における太陽電池の略図的裏面図である。FIG. 3 is a schematic rear view of the solar cell in one embodiment of the present invention. 図４は、本発明の一実施形態における太陽電池ストリングの一部分の略図的裏面図である。FIG. 4 is a schematic back view of a portion of a solar cell string in one embodiment of the present invention. 図５は、図４の線Ｖ－Ｖにおける配線材の略図的断面図である。FIG. 5 is a schematic cross-sectional view of the wiring member taken along line VV in FIG. 図６は、変形例における太陽電池ストリングの一部分の略図的裏面図である。FIG. 6 is a schematic rear view of a part of a solar cell string in a modified example.
　以下、本発明を実施した好ましい形態の一例について説明する。但し、下記の実施形態は、単なる例示である。本発明は、下記の実施形態に何ら限定されない。 Hereinafter, an example of a preferable embodiment in which the present invention is implemented will be described. However, the following embodiment is merely an example. The present invention is not limited to the following embodiments.
　また、実施形態等において参照する各図面において、実質的に同一の機能を有する部材は同一の符号で参照することとする。また、実施形態等において参照する図面は、模式的に記載されたものであり、図面に描画された物体の寸法の比率などは、現実の物体の寸法の比率などとは異なる場合がある。図面相互間においても、物体の寸法比率等が異なる場合がある。具体的な物体の寸法比率等は、以下の説明を参酌して判断されるべきである。 In each drawing referred to in the embodiment and the like, members having substantially the same function are referred to by the same reference numerals. The drawings referred to in the embodiments and the like are schematically described, and the ratio of the dimensions of the objects drawn in the drawings may be different from the ratio of the dimensions of the actual objects. The dimensional ratio of the object may be different between the drawings. The specific dimensional ratio of the object should be determined in consideration of the following description.
　図２に示されるように、太陽電池モジュール１は、複数の太陽電池ストリング１０を備えている。図１に示されるように、複数の太陽電池ストリング１０は、受光面側に位置する第１の保護部材１１と、裏面側に位置する第２の保護部材１２との間に配されている。第１の保護部材１１と第２の保護部材１２との間には、封止層１３が設けられている。複数の太陽電池ストリング１０は、封止層１３によって封止されている。 As shown in FIG. 2, the solar cell module 1 includes a plurality of solar cell strings 10. As shown in FIG. 1, the plurality of solar cell strings 10 are arranged between a first protection member 11 located on the light receiving surface side and a second protection member 12 located on the back surface side. A sealing layer 13 is provided between the first protective member 11 and the second protective member 12. The plurality of solar cell strings 10 are sealed by the sealing layer 13.
　第１及び第２の保護部材１１，１２の少なくとも一方は、可撓性を有することが好ましい。第１及び第２の保護部材１１，１２のうちの一方が可撓性を有し、他方が可撓性を有さないことがより好ましい。本実施形態では、具体的には、第１の保護部材１１が可撓性を有さない剛体により構成されており、第２の保護部材１２が可撓性を有する部材により構成されている。 It is preferable that at least one of the first and second protective members 11 and 12 has flexibility. More preferably, one of the first and second protection members 11 and 12 has flexibility and the other does not have flexibility. In the present embodiment, specifically, the first protection member 11 is configured by a rigid body that does not have flexibility, and the second protection member 12 is configured by a member that has flexibility.
　第１の保護部材１１は、例えば、ガラス基板、樹脂基板等の透光性を有する部材により構成することができる。第２の保護部材１２は、例えば、樹脂シート、金属箔を介在させた樹脂シート、ガラス基板、樹脂基板等により構成することができる。 The first protective member 11 can be made of a translucent member such as a glass substrate or a resin substrate, for example. The second protective member 12 can be constituted by, for example, a resin sheet, a resin sheet with a metal foil interposed therebetween, a glass substrate, a resin substrate, or the like.
　封止層１３は、例えば、エチレン・酢酸ビニル共重合体（ＥＶＡ）、ポリビニルブチラール（ＰＶＢ）、ポリエチレン（ＰＥ）、ポリウレタン（ＰＵ）などの樹脂により構成することができる。封止層１３は、非架橋性の樹脂を含むことが好ましい。 The sealing layer 13 can be made of, for example, a resin such as ethylene / vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyethylene (PE), polyurethane (PU), or the like. The sealing layer 13 preferably contains a non-crosslinkable resin.
　図２に示されるように、複数の太陽電池ストリング１０は、ｙ方向に沿って間隔をおいて配されている。複数の太陽電池ストリング１０は、ｙ方向に対して垂直なｘ方向に沿って間隔をおいて配された複数の太陽電池２０を有する。各太陽電池ストリング１０において、ｘ方向に隣り合う太陽電池２０は、配線材３１によって電気的に接続されている。これにより、太陽電池ストリング１０に含まれる太陽電池２０が配線材３１によって電気的に接続されている。また、隣り合う太陽電池ストリング１０は、隣り合う太陽電池ストリング１０のｘ方向端部に位置する太陽電池２０同士を配線材３２によって接続することにより電気的に接続されている。 As shown in FIG. 2, the plurality of solar cell strings 10 are arranged at intervals along the y direction. The plurality of solar cell strings 10 includes a plurality of solar cells 20 arranged at intervals along the x direction perpendicular to the y direction. In each solar cell string 10, solar cells 20 adjacent in the x direction are electrically connected by a wiring material 31. Thereby, the solar cells 20 included in the solar cell string 10 are electrically connected by the wiring member 31. Further, the adjacent solar cell strings 10 are electrically connected by connecting the solar cells 20 located at the end portions in the x direction of the adjacent solar cell strings 10 by the wiring member 32.
　図３に示されるように、太陽電池２０は、光電変換部２３と、一導電型側の電極である第１の電極２１と、他導電型側の電極である第２の電極２２とを有する。光電変換部２３は、受光した際に正孔や電子などのキャリアを生成させるものである限りにおいて特に限定されない。光電変換部２３は、例えばシリコン基板を用いたものとすることができる。 As shown in FIG. 3, the solar cell 20 includes a photoelectric conversion unit 23, a first electrode 21 that is an electrode on one conductivity type side, and a second electrode 22 that is an electrode on the other conductivity type side. . The photoelectric conversion unit 23 is not particularly limited as long as it generates carriers such as holes and electrons when receiving light. The photoelectric conversion part 23 can use a silicon substrate, for example.
　光電変換部２３は、第１の主面と、第２の主面２３ａとを有する。第１の電極２１及び第２の電極２２は、第２の主面２３ａの上に配されている。従って、太陽電池２０は、裏面接合型の太陽電池である。 The photoelectric conversion unit 23 has a first main surface and a second main surface 23a. The first electrode 21 and the second electrode 22 are disposed on the second main surface 23a. Therefore, the solar cell 20 is a back junction solar cell.
　第１の電極２１及び第２の電極２２のそれぞれは、複数のフィンガー部２１ａ、２２ａを有する。複数のフィンガー部２１ａ、２２ａのそれぞれは、ｙ方向に沿って延びている。このため、各太陽電池ストリング１０において、複数の太陽電池２０は、フィンガー部２１ａ、２２ａの延びる方向であるｙ方向に対して傾斜した方向、具体的には、ｙ方向に対して垂直な方向であるｘ方向に沿って間隔をおいて配列されている。複数のフィンガー部２１ａ、２２ａは、ｙ方向に対して垂直なｘ方向に沿って間隔をおいて交互に配されている。第１の電極２１及び第２の電極２２は、複数のフィンガー部２１ａ、２２ａが電気的に接続されたバスバー部２１ｂ、２２ｂをさらに有する。ｙ方向に隣り合う太陽電池２０の一方の太陽電池のバスバー部２１ｂと、他方の太陽電池のバスバー部２２ｂとは、ｙ方向に対向している。 Each of the first electrode 21 and the second electrode 22 has a plurality of finger portions 21a and 22a. Each of the plurality of finger portions 21a and 22a extends along the y direction. For this reason, in each solar cell string 10, the plurality of solar cells 20 are inclined with respect to the y direction, which is the direction in which the finger portions 21a and 22a extend, specifically, in a direction perpendicular to the y direction. They are arranged at intervals along a certain x direction. The plurality of finger portions 21a and 22a are alternately arranged at intervals along the x direction perpendicular to the y direction. The first electrode 21 and the second electrode 22 further include bus bar portions 21b and 22b to which a plurality of finger portions 21a and 22a are electrically connected. The bus bar portion 21b of one solar cell of the solar cells 20 adjacent in the y direction and the bus bar portion 22b of the other solar cell face each other in the y direction.
　但し、本発明において、第１及び第２の電極は、バスバー部を有さず、複数のフィンガー部により構成されているバスバーレスの電極であってもよい。 However, in the present invention, the first and second electrodes may be bus bar-less electrodes that do not have a bus bar portion and are configured by a plurality of finger portions.
　なお、本発明において、「傾斜」には、垂直が含まれるものとする。 In the present invention, “tilt” includes vertical.
　複数のフィンガー部２１ａ、２２ａのうち、太陽電池２０のｘ方向における最も外側に位置しているフィンガー部は、第１の電極２１に含まれるフィンガー部２１ａである。このため、一の太陽電池２０の、一の太陽電池２０にｘ方向において隣接している他の太陽電池の最も近くに位置しているフィンガー部と、他の太陽電池２０の一の太陽電池２０の最も近くに位置しているフィンガー部との両方が、第１の電極２１に含まれる。一の太陽電池２０の最も他の太陽電池２０側に位置しているフィンガー部２１ａと、他の太陽電池２０の最も一の太陽電池２０側に位置しているフィンガー部２１ａとは、ｙ方向に対して傾斜した方向、具体的にはｙ方向に対して垂直なｘ方向において対向している。 Among the plurality of finger portions 21 a and 22 a, the finger portion located on the outermost side in the x direction of the solar cell 20 is the finger portion 21 a included in the first electrode 21. For this reason, the finger part of the one solar cell 20 located closest to the other solar cell adjacent to the one solar cell 20 in the x direction, and one solar cell 20 of the other solar cell 20. The first electrode 21 includes both the finger portion located closest to the first electrode 21. The finger portion 21a located on the most other solar cell 20 side of one solar cell 20 and the finger portion 21a located on the most solar cell 20 side of the other solar cell 20 are in the y direction. They are opposed to each other in an inclined direction, specifically in the x direction perpendicular to the y direction.
　図４及び図５に示されるように、配線材３１は、配線材本体３１ａと、配線３１ｂと、絶縁層３１ｃとを有する。配線材本体３１ａは、例えば、樹脂フィルムなどの絶縁性部材により構成されている。配線３１ｂは、配線材本体３１ａの上に配されている。この配線３１ｂは、一の太陽電池２０のフィンガー部２１ａに電気的に接続されていると共に、一の太陽電池２０に対してｘ方向に隣接している太陽電池２０のフィンガー部２２ａに電気的に接続されている。配線３１ｂと、一の太陽電池２０の第２の電極２２及び他の太陽電池２０の第１の電極２１とは、絶縁層３１ｃによって電気的に絶縁されている。 4 and 5, the wiring member 31 includes a wiring member body 31a, a wiring 31b, and an insulating layer 31c. The wiring material main body 31a is comprised by insulating members, such as a resin film, for example. The wiring 31b is arranged on the wiring material body 31a. The wiring 31b is electrically connected to the finger portion 21a of one solar cell 20, and is electrically connected to the finger portion 22a of the solar cell 20 adjacent to the one solar cell 20 in the x direction. It is connected. The wiring 31b is electrically insulated from the second electrode 22 of one solar cell 20 and the first electrode 21 of another solar cell 20 by an insulating layer 31c.
　なお、配線材３１と、太陽電池２０とは、図示しない接着層によって接着されている。接着層は、例えば、半田、樹脂接着剤の硬化物、導電材が分散混入している樹脂接着剤の硬化物等により構成することができる。また、隣り合う太陽電池ストリング１０を電気的に接続する配線材３２は、配線材３１と同様の構成を有し、接着層により固定されている。 In addition, the wiring material 31 and the solar cell 20 are adhere | attached by the contact bonding layer which is not shown in figure. The adhesive layer can be composed of, for example, solder, a cured product of a resin adhesive, a cured product of a resin adhesive in which a conductive material is dispersed and mixed, and the like. Further, the wiring member 32 that electrically connects the adjacent solar cell strings 10 has the same configuration as the wiring member 31 and is fixed by an adhesive layer.
　ところで、一般的には、各太陽電池ストリングにおいて、フィンガー部の延びる方向に沿って太陽電池が配列され、フィンガー部の延びる方向に隣接する太陽電池同士が配線材により電気的に接続されている。より具体的には、フィンガー部の延びる方向に対して垂直な方向における最も外側に位置するバスバー部が複数のフィンガー部に接続されるよう設けられ、隣接する太陽電池のバスバー部同士が配線材により接続されている。裏面接合型の太陽電池は、フィンガーの延びる方向に対して垂直な方向に強度が一様でない。このため、フィンガー部の延びる方向に細い配線材を配置すると、モジュール化する際に太陽電池がフィンガー部の方向を軸として曲がり、太陽電池が割れる恐れがあった。さらには、配線材を細くすると、バスバー部と配線材の接触面積が小さくなり、抵抗が高くなるという問題が生じていた。 By the way, generally, in each solar cell string, solar cells are arranged along the direction in which the finger portions extend, and the solar cells adjacent in the direction in which the finger portions extend are electrically connected to each other by a wiring material. More specifically, the bus bar portion located on the outermost side in the direction perpendicular to the direction in which the finger portions extend is provided to be connected to the plurality of finger portions, and the bus bar portions of adjacent solar cells are connected to each other by the wiring material It is connected. The back junction type solar cell is not uniform in strength in the direction perpendicular to the direction in which the fingers extend. For this reason, when a thin wiring member is arranged in the direction in which the finger portion extends, the solar cell may be bent with the finger portion direction as an axis when modularized, and the solar cell may break. Furthermore, when the wiring material is made thinner, the contact area between the bus bar portion and the wiring material is reduced, resulting in a problem that the resistance is increased.
　それに対して本実施形態では、フィンガー部２１ａ、２２ａの延びる方向であるｙ方向に対して傾斜した方向、具体的には、ｙ方向に対して垂直なｘ方向に隣り合う太陽電池２０が配線材３１により電気的に接続されている。より具体的には、フィンガー部２１ａ、２２ａに配線材３１が接続されている。このため、フィンガー部の延びる方向に配線材を細くした場合であっても、モジュール化する際に生じる裏面接合型の太陽電池の割れを抑制することができる。また、フィンガー部２１ａ、２２ａと配線材３１の接触面積が小さくなって抵抗が高くなることを抑制することができる。このため、フィンガー部の延びる方向に細い配線材３１を用いることが可能となる。 On the other hand, in the present embodiment, the solar cell 20 adjacent to the direction inclined with respect to the y direction that is the direction in which the finger portions 21a and 22a extend, specifically, the x direction perpendicular to the y direction is the wiring material. 31 is electrically connected. More specifically, the wiring material 31 is connected to the finger portions 21a and 22a. For this reason, even if it is a case where a wiring material is made thin in the direction where a finger part extends, the crack of the back junction type solar cell which arises when modularizing can be controlled. Moreover, it can suppress that the contact area of the finger parts 21a and 22a and the wiring material 31 becomes small, and resistance becomes high. For this reason, it becomes possible to use the thin wiring material 31 in the extending direction of the finger portions.
　また、一般に用いられていた配線材は、金属等の反射性部材から形成されていることが多かった。しかしながら、光が入射する受光面側に配置される第１の保護部材１１側の面が平坦となっており、配線材に入射した光をより良く太陽電池に入射させることが出来ていなかった。一方、第２の保護部材１３は、複数の層を用いることができ、容易に第２の保護部材１３の受光面側の部材を入射する光を反射・散乱させることができ、一般に光を反射・散乱させることができる部材を有する第２の保護部材１３が用いられている。このため、太陽電池モジュール１内において、光を散乱させ、光を太陽電池２０へ再入射させることができるため、より良い光電変換効率を得ることができる。なお、第２の保護部材１３が光を反射・散乱させることができる部材を有する部材を有しない場合であっても、封止層１３を白色等に着色し、光を散乱させることができる構成とすることにより、同様の効果を得ることができる。 In addition, generally used wiring materials are often formed from reflective members such as metal. However, the surface on the first protective member 11 side arranged on the light receiving surface side on which light is incident is flat, and the light incident on the wiring member cannot be incident on the solar cell better. On the other hand, the second protective member 13 can use a plurality of layers, and can easily reflect and scatter light incident on the light receiving surface side member of the second protective member 13, and generally reflects light. A second protective member 13 having a member that can be scattered is used. For this reason, in the solar cell module 1, since light can be scattered and light can reenter the solar cell 20, better photoelectric conversion efficiency can be obtained. In addition, even if it is a case where the 2nd protection member 13 does not have a member which has a member which can reflect and scatter light, the structure which can color the sealing layer 13 in white etc. and can scatter light By doing so, the same effect can be obtained.
　なお、本実施形態では、隣り合う太陽電池ストリング１０のそれぞれ端部に位置する太陽電池２０同士を、接着層を介して配線材３２で電気的に接続している例について説明した。より具体的には、隣り合う太陽電池ストリング１０のそれぞれ端部に位置する太陽電池２０のうちの、一方の太陽電池２０の第１の電極２１と、他方の太陽電池の第２の電極２２とを配線材３２を用いて接続している。この結果、配線材同士を重畳させることなく配置できる。その他、太陽電池の第１の電極２１もしくは第２の電極２２と、配線材３２の配線との接続面積を大きくすることができ、接続抵抗の低減することが可能となる。さらに配線材３２の銅などの金属からなる配線自体の抵抗が大きくなることを抑制しつつ薄くすることができる。 In addition, in this embodiment, the example which electrically connected the solar cells 20 located in each edge part of the adjacent solar cell string 10 with the wiring material 32 via the contact bonding layer was demonstrated. More specifically, of the solar cells 20 positioned at the end portions of the adjacent solar cell strings 10, the first electrode 21 of one solar cell 20 and the second electrode 22 of the other solar cell Are connected using a wiring member 32. As a result, the wiring members can be arranged without overlapping each other. In addition, the connection area between the first electrode 21 or the second electrode 22 of the solar cell and the wiring of the wiring member 32 can be increased, and the connection resistance can be reduced. Furthermore, the wiring material 32 can be made thin while suppressing an increase in resistance of the wiring itself made of a metal such as copper.
　本実施形態では、太陽電池ストリング１０を構成している太陽電池２０がフィンガー部２１ａ、２２ａの延びる方向と垂直な方向に沿って配列されている例について説明した。但し、本発明は、この構成に限定されない。例えば図６に示すように、配線材３１により電気的に接続されている太陽電池２０がフィンガー部２１ａ、２２ａの延びる方向に対して斜めである方向に沿って配列されていてもよい。その場合であっても、本実施形態と同様の効果が得られる。 In the present embodiment, an example has been described in which the solar cells 20 constituting the solar cell string 10 are arranged along a direction perpendicular to the direction in which the finger portions 21a and 22a extend. However, the present invention is not limited to this configuration. For example, as shown in FIG. 6, the solar cells 20 that are electrically connected by the wiring member 31 may be arranged along a direction that is oblique to the direction in which the finger portions 21a and 22a extend. Even in that case, the same effect as the present embodiment can be obtained.
　本実施形態では、太陽電池モジュール１が複数の太陽電池ストリング１０を備える例について説明した。但し、本発明は、この構成に限定されない。本発明に係る太陽電池モジュールは、フィンガー部の延びる方向に対して傾斜した方向に配列されており、配線材により電気的に接続されている少なくとも２つの太陽電池を有している限りにおいて特に限定されない。 In the present embodiment, an example in which the solar cell module 1 includes a plurality of solar cell strings 10 has been described. However, the present invention is not limited to this configuration. The solar cell module according to the present invention is particularly limited as long as it has at least two solar cells arranged in a direction inclined with respect to the extending direction of the finger portions and electrically connected by the wiring member. Not.
　本発明はここでは記載していない様々な実施形態を含む。従って、本発明の技術的範囲は上記の説明から妥当な特許請求の範囲に係る発明特定事項によってのみ定められるものである。 The present invention includes various embodiments not described herein. Therefore, the technical scope of the present invention is defined only by the invention specifying matters according to the scope of claims reasonable from the above description.
１…太陽電池モジュール
１０…太陽電池ストリング
１１…第１の保護部材
１２…第２の保護部材
１３…封止層
２０…太陽電池
２１…第１の電極
２２…第２の電極
２１ａ、２２ａ…フィンガー部
２１ｂ、２２ｂ…バスバー部
２３…光電変換部
２３ａ…光電変換部の主面
３１，３２…配線材 DESCRIPTION OF SYMBOLS 1 ... Solar cell module 10 ... Solar cell string 11 ... 1st protection member 12 ... 2nd protection member 13 ... Sealing layer 20 ... Solar cell 21 ... 1st electrode 22 ... 2nd electrode 21a, 22a ... Finger Sections 21b, 22b ... Bus bar part 23 ... Photoelectric conversion part 23a ... Main surfaces 31 and 32 of photoelectric conversion part ... Wiring material

Claims (5)

  1. 　一の方向に対して傾斜した方向に沿って間隔をおいて配されている第１及び第２の太陽電池と、
    　前記第１の太陽電池と前記第２の太陽電池とを電気的に接続している配線材と、
    を備え、
    　前記第１及び第２の太陽電池のそれぞれは、
    　光電変換部と、
    　前記光電変換部の一主面の上に配されており、それぞれ、前記一の方向に沿って延びる複数のフィンガー部を含む一導電型側の電極及び他導電型側の電極と、
    を有し、
    　前記第１の太陽電池の最も前記第２の太陽電池側に位置しているフィンガー部と、前記第２の太陽電池の最も前記第１の太陽電池側に位置しているフィンガー部との両方が、前記一導電型側の電極に含まれる、太陽電池モジュール。     First and second solar cells spaced apart along a direction inclined with respect to one direction;
    A wiring member electrically connecting the first solar cell and the second solar cell;
    With
    Each of the first and second solar cells is
    A photoelectric conversion unit;
    An electrode on one conductivity type side and an electrode on the other conductivity type side, each including a plurality of finger portions that are arranged on one main surface of the photoelectric conversion portion and extend along the one direction;
    Have
    Both of the finger portion located closest to the second solar cell side of the first solar cell and the finger portion located closest to the first solar cell side of the second solar cell. A solar cell module included in the electrode on the one conductivity type side.
  2. 　請求項１に記載の太陽電池モジュールであって、
    　前記第１の太陽電池の最も前記第２の太陽電池側に位置しているフィンガー部と、前記第２の太陽電池の最も前記第１の太陽電池側に位置しているフィンガー部とは、前記一の方向に対して傾斜した方向において対向している。     The solar cell module according to claim 1,
    The finger portion located closest to the second solar cell side of the first solar cell and the finger portion located closest to the first solar cell side of the second solar cell are Opposing in a direction inclined with respect to one direction.
  3. 　請求項１または２に記載の太陽電池モジュールであって、
    　前記第１及び第２の太陽電池の一方側に配されている第１の保護部材と、
    　前記第１及び第２の太陽電池の他方側に配されている第２の保護部材と、
    　前記第１の保護部材と前記第２の保護部材との間に配されており、前記第１及び第２の太陽電池を封止している封止層と、
    をさらに備える。     The solar cell module according to claim 1 or 2,
    A first protective member disposed on one side of the first and second solar cells;
    A second protective member disposed on the other side of the first and second solar cells;
    A sealing layer disposed between the first protective member and the second protective member and sealing the first and second solar cells;
    Is further provided.
  4. 　請求項３に記載の太陽電池モジュールであって、
    　前記第１及び第２の保護部材の少なくとも一方が可撓性を有する。     The solar cell module according to claim 3, wherein
    At least one of the first and second protective members has flexibility.
  5. 　請求項３または４に記載の太陽電池モジュールであって、
    　前記封止層は、非架橋性の樹脂を含む。     The solar cell module according to claim 3 or 4, wherein
    The sealing layer contains a non-crosslinkable resin.
PCT/JP2012/073919 2011-09-20 2012-09-19 Solar cell module WO2013042683A1 (en)

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2017117946A (en) * 2015-12-24 2017-06-29 トヨタ自動車株式会社 Solar cell module
US11205732B2 (en) * 2014-09-19 2021-12-21 Kabushiki Kaisha Toshiba Multi-junction solar cell

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