WO2015037213A1 - Élément de batterie solaire, module de batteries solaires et procédé de production d'un module de batteries solaires - Google Patents

Élément de batterie solaire, module de batteries solaires et procédé de production d'un module de batteries solaires Download PDF

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Publication number
WO2015037213A1
WO2015037213A1 PCT/JP2014/004569 JP2014004569W WO2015037213A1 WO 2015037213 A1 WO2015037213 A1 WO 2015037213A1 JP 2014004569 W JP2014004569 W JP 2014004569W WO 2015037213 A1 WO2015037213 A1 WO 2015037213A1
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WIPO (PCT)
Prior art keywords
electrode
solar battery
solar
solar cell
opening
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PCT/JP2014/004569
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English (en)
Japanese (ja)
Inventor
明史 樋口
秀昭 奥宮
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デクセリアルズ株式会社
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Publication of WO2015037213A1 publication Critical patent/WO2015037213A1/fr

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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
    • H01L31/02—Details
    • H01L31/0224—Electrodes
    • H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
    • H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for 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
    • H01L31/05—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
    • H01L31/0512—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 made of a particular material or composition of materials
    • 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, for example, a solar cell, a solar cell module in which electrodes of a plurality of solar cells are electrically connected to each other by a tab wire via a conductive adhesive, and a method for manufacturing the solar cell module.
  • the present invention relates to a solar battery cell, a solar battery module, and a manufacturing method thereof that can reduce the cost by reducing the area of the Ag electrode on the back surface of the cell.
  • tab wires are connected to front and back electrodes of a plurality of adjacent solar cells, and both sides of the solar cells are connected to a front cover on the light receiving surface side and a back surface side through a sealing resin.
  • the structure is protected by a backsheet.
  • solder connection is conventionally performed.
  • the solder connection has a large internal stress due to heat at the time of connection, which may cause a connection failure or flow out of the solder.
  • connection by a conductive adhesive film has been proposed (see Patent Document 1).
  • Patent Document 2 an opening is provided in the connection portion with the tab wire on the Al back electrode, and the silicon surface of the silicon cell substrate exposed through the opening is bonded to the conductive adhesive.
  • a solar cell module is disclosed.
  • Ag is used as the electrode material in the solar battery cell. Since such Ag is expensive and leads to an increase in the cost of solar cells, there is a movement to reduce the amount of use.
  • connection method using the conductive adhesive film can use bus bar-less solar cells unlike solder connection, it is an effective connection corresponding to the movement to reduce the amount of Ag used. It can be said that it is a method.
  • the present invention has been made in view of the above-described technical problems, and it is possible to obtain good connection reliability and output characteristics while reducing the amount of Ag used for the back electrode. It aims at providing a battery cell, a solar cell module, and its manufacturing method.
  • the solar cell of the present invention is a solar cell provided with at least finger electrodes.
  • the connection region where the tab wire is connected is provided in the solar cell provided with an Al electrode on the entire back surface.
  • An opening is provided along the connection region, and an Ag electrode is provided so as to straddle the opening.
  • the solar cell module of the present invention is connected through a conductive adhesive in which the electrode of the solar cell and the tab wire are cured, and further includes a sealing material and a transparent substrate. Were laminated.
  • the manufacturing method of the solar cell module of the present invention is the method of manufacturing a solar cell module in which a plurality of solar cells are connected by a tab wire, and an Al electrode is provided on the entire back surface of the solar cell, In the connection region to which the tab wire is connected, an opening is provided along the connection region, an Ag electrode is provided so as to straddle the opening, and a conductive adhesive is connected between the electrode of the solar battery cell and the tab wire. And the transparent base material is laminated, and then sealed with a sealing material.
  • the solar battery cell, the solar battery module, and the manufacturing method thereof according to the present invention it is possible to obtain good connection reliability and output characteristics while reducing the amount of Ag used for the back electrode. .
  • FIG. 5 is a partially enlarged view of FIG. 4. It is a flowchart for demonstrating the manufacturing method of the solar cell module which concerns on the 1st Embodiment of this invention.
  • the solar cell module and the manufacturing method thereof according to the present invention is a solar cell module in which a solar cell and a tab wire are connected via a conductive adhesive, and the area of the Ag electrode on the back surface of the solar cell is reduced. It is possible to reduce the cost.
  • this invention relates to the manufacturing method of the photovoltaic cell which has the following structures, a photovoltaic module, and a photovoltaic module.
  • a back electrode an Al electrode is provided on the entire back surface of the solar battery cell.
  • an opening is provided in the Al electrode along the connection area of the tab wire, and silicon (Si) is exposed in the opening (that is, in the groove-shaped opening). Si is exposed).
  • Si silicon
  • a ladder-shaped Ag electrode is disposed in the opening of the Al electrode.
  • FIG. 1 shows a connection relationship between solar cells and tab wires according to the first embodiment of the present invention
  • FIG. 2 shows a partial cross-sectional view of the solar cell module
  • FIG. 3 shows a solar cell module. A side cross-sectional portion is shown and described.
  • FIG. 2 corresponds to a cross-sectional view taken along the line AA ′ of FIG.
  • a metal wire such as a copper wire having a thermal contraction rate different from that of the solar battery cell 1 is provided along an Ag electrode (not shown).
  • a tab wire 7 as a main material is joined via a conductive adhesive 6.
  • the conductive adhesive 6 is made of a material in which fine conductive particles are dispersed in a film-like insulating resin material. By pressurizing and heating, the conductive adhesive 6 can be bonded via the conductive particles. Thus, it has an electrical connection function in the thickness direction and an insulation function in the direction perpendicular to the thickness direction.
  • the conductive adhesive 6 may be a paste in addition to a film.
  • Examples of the conductive particles used in the conductive adhesive include metal particles such as nickel, gold, and copper, those obtained by applying gold plating to resin particles, and insulating the outermost layer of particles obtained by applying gold plating to resin particles. The thing etc. which gave the film can be adopted.
  • the composition of the binder resin layer of the conductive adhesive contains, for example, a film forming resin, a liquid epoxy resin, a latent curing agent, and a silane coupling agent. Specifically, various resins such as an epoxy resin, a modified epoxy resin, a urethane resin, and a phenoxy resin can be used as the film forming resin.
  • liquid epoxy resin commercially available epoxy resins such as naphthalene epoxy resin, biphenyl type epoxy resin, phenol novolac type epoxy resin and the like can be used.
  • latent curing agent various curing agents such as a heat curing type and a UV curing type can be employed.
  • silane coupling agent an epoxy system, an amino system, a mercapto sulfide system, a ureido system, etc. are employable. However, it is not limited to these.
  • the solar cell 1 has a light receiving surface Ag electrode 4 disposed on the semiconductor substrate 5 on the light receiving surface side, and the back surface is entirely covered with the Al electrode 2, which will be described in detail later.
  • a partial opening is provided, the silicon of the semiconductor substrate 5 is exposed, and a ladder-like back surface Ag electrode 3 is disposed in the opening.
  • the light-receiving surface Ag electrode 4 may be configured by forming a current collecting finger electrode made of Ag and a bus bar electrode for output extraction so as to be orthogonal to each other in the same layer.
  • the use of P-type crystalline silicon solar cells is taken as an example.
  • the silicon semiconductor substrate 5 is mainly composed of an N-type layer 13 in which electrons are conducted by addition of impurities and a P-type layer 12 in which holes are conducted, and this pn junction has a basic structure. When light is applied to the pn junction, electrons and holes are generated, an electromotive force is generated, and a current flows. A high-concentration p + layer 11 is also provided on the back side to reduce electrical resistance.
  • one end of the tab wire 7 is wired over substantially the entire length of the light receiving surface Ag electrode 4 of the solar battery cell 1 and bonded to the light receiving surface Ag electrode 4 via the conductive adhesive 6.
  • the tab wire 7 is electrically connected.
  • the other end of the tab wire 7 is electrically connected to the back surface Ag electrode 3 of the adjacent solar battery cell 1 through the conductive adhesive 6.
  • the solar battery cell 1 is electrically connected to the adjacent solar battery cell by joining the tab wire 7 via the Ag electrodes 3 and 4.
  • the tab wire 7 may be subjected to rust prevention treatment such as tin plating or pre-coating on the surface of the metal wire instead of using a single metal wire in order to improve the weather resistance.
  • the conductive adhesive 6 and the tab wire 7 may not be separately provided but may be a tab wire 7 in which the conductive adhesive 6 is applied to the surface of the metal wire. More specifically, the tab wire 7 with the conductive adhesive may be used by applying a conductive adhesive to the copper foil and cutting it into a slit shape. In this case, steps such as temporary sticking of the conductive adhesive on the solar battery cell 1 can be omitted.
  • the solar cell module has an ethylene / acetic acid between a transparent tempered glass 22 supported by a predetermined aluminum frame 21 and serving as a light receiving surface, and a weather resistant film 23.
  • a transparent resin 24 such as a vinyl copolymer (EVA; Ethylene-Vinyl ⁇ Acetate) is embedded, and a plurality of solar cells 1 are arranged in the transparent resin 24 according to a predetermined rule.
  • FIG. 4 shows a characteristic pattern of the back surface of the solar cell according to the first embodiment of the present invention
  • FIG. 5 shows a partially enlarged view of FIG. 4 for explanation.
  • the Al electrode 2 is uniformly provided on the back surface of the semiconductor substrate 5 of the solar cell 1 of the P-type Si crystal system, and the connection portion of the tab wire 7 An opening 2a in which silicon is exposed without forming the Al electrode 2 in the same width or wide area as the tab line 7 is provided, and bridging is performed from one Al electrode to the other Al electrode of the opening 2a.
  • a plurality of Ag electrodes 3 are formed for one opening 2 a and are electrically connected to the Al electrode 2.
  • the back surface Ag electrode 3 is connected to the tab wire 7 via the conductive adhesive 6 to form a string and a matrix of the solar battery cell 1.
  • the Al electrode is formed after the Ag electrode is formed by screen printing. However, the present invention is not limited to this.
  • the Al electrode including the p + layer 11 is formed, and the Ag electrode 3 is located in the gap between the p + layer 11 and the Al electrode.
  • the width a3 of the bridging Ag electrode 3 may be 0.1 mm to 1.5 mm.
  • the length a1 of the Ag electrode 3 is 4 mm
  • the width a2 of the opening 2a is 2 mm
  • the width a3 of the Ag electrode is 0.2 mm.
  • the present invention is not limited to this.
  • the bridging Ag electrode 3 has a strip shape.
  • a conductive adhesive film is produced as the conductive adhesive 6 (step S1), and the conductive adhesive film is applied to the portion where the light receiving surface and back surface tab wire 7 of the solar battery cell 1 are joined at 60 ° C. for 0.5 to Temporarily fix in 2 seconds (step S2). Subsequently, the attachment position of the conductive adhesive film is inspected (step S3). If a positional deviation is detected, adjustment is performed (step S4), and the conductive adhesive film is temporarily attached again. When the positional deviation is not detected (step S3 is branched to OK), a tab line is temporarily pasted between the plurality of solar cells, and strings are formed (step S5). After that, the tab wire and each electrode of the solar battery cell are finally pressure-bonded via the conductive adhesive film by being hot-pressed from above the tab wire (step S6).
  • the tab wire 7 is placed on the conductive adhesive film, and the heater head from the light receiving surface side and the back surface of the solar battery cell 1 is used, for example, the actual temperature of the pressure bonding portion is 180 ° C., the pressure bonding time Crimping is performed for 15 sec under a pressure of 2 MPa.
  • a rubber sheet for buffering (Shinetsu Chemical Industry's SolarSheet-20LSP / 200 ⁇ m thickness) is sandwiched between the tab wire 7 and the heater head, but is not particularly limited.
  • the solar cell module is manufactured by sealing with the transparent resin 24 (step S7).
  • the amount of Ag paste used on the back surface while ensuring the connection strength and cell output between the back surface of the solar cell and the tab wire. It is possible to reduce costs by reducing the cost.
  • an electrode made of copper or the like is formed on the back surface of the semiconductor substrate by, for example, screen printing or sputtering.
  • FIG. 7 shows and explains the back surface pattern of the solar battery cell according to the second embodiment of the present invention.
  • the opening 30a of the Al electrode 30 on the back surface of the solar battery cell may be divided into a plurality of regions with respect to the tab wire connection direction.
  • openings 30a are provided in four regions in one tab line joining region, and three strip-shaped Ag electrodes 31 are provided in each opening 30a as one Al electrode of the opening 30a.
  • To the other Al electrode arrangement region so as to be bridged and conductive.
  • the amount of Ag paste used is further reduced as compared to the first embodiment while sufficiently securing the connection strength. Costs can be further reduced.
  • FIG. 8 shows and explains the back surface pattern of the solar battery cell according to the third embodiment of the present invention.
  • the opening 40a of the Al electrode 40 on the back surface of the solar battery cell is continuously divided over the junction region of the tab line or divided into a plurality of regions as shown in FIG. It may be provided.
  • the Ag electrode 41 having a rectangular area with a large area at the center of the opening 40a bridges from one Al electrode to the other Al electrode of the opening 40a. It is in the point of being joined and conducting.
  • the Ag electrode is not strip-shaped, but has a feature in that it has regions having different widths.
  • the area of the Ag electrode is larger than that of the first and second embodiments, so that sufficient bonding strength is ensured.
  • the cell output can be sufficiently increased.
  • FIG. 9 shows and explains a back surface pattern of a solar battery cell according to the fourth embodiment of the present invention.
  • the opening 50a of the Al electrode 50 on the back surface of the solar battery cell is continuously divided over the junction area of the tab line or divided into a plurality of areas as previously shown in FIG. It may be provided.
  • the characteristic of this embodiment is that the Ag electrode 51 having a bent portion bent at the center of the opening 50a is joined and bridged so as to bridge from one Al electrode to the other Al electrode of the opening 50a. There is in point.
  • the Ag electrode is not a simple strip shape, but has a feature that it has a partially bent region.
  • the area covering the opening is larger than that of a simple strip-shaped Ag electrode.
  • the cell output can be sufficiently increased while ensuring.
  • FIG. 10 shows and explains the back surface pattern of the solar battery cell according to the fifth embodiment of the present invention.
  • the opening 60a of the Al electrode 60 on the back surface of the solar battery cell is continuously divided over the joint area of the tab line or divided into a plurality of areas as previously shown in FIG. It may be provided.
  • the feature of this embodiment is that the portion of the Ag electrode 61 that contacts the Al electrode 60 is large, and the portion of the opening 60a that bridges from one Al electrode to the other Al electrode is strip-shaped. There is in point.
  • the Ag electrode 61 is firmly connected to one Al electrode and the other Al electrode of the opening 60a in a region having a large area, and extends so as to bridge between the two.
  • the Ag electrode is reliably bonded to the Al electrode by the large area while securing sufficient bonding strength. Since it conducts, it becomes possible to improve the cell output.
  • a strip-shaped Ag electrode is disposed in the opening of the Al electrode on the back surface of the solar cell described in the first embodiment, and a tab wire is attached to the Ag electrode via a conductive adhesive.
  • a conductive adhesive is attached to the Ag electrode via a conductive adhesive.
  • the cell output measurement was performed with a solar simulator (Nisshinbo Mechatronics model PVS1116i) in the state after the tab wire bonding.
  • the measurement conditions were based on JIS C8913 (Crystal solar cell output measurement method). And since the output dispersion
  • Example 1 In Example 1, the width of the Ag electrode was 0.2 mm and the pitch was 2.2 mm. The amount of Ag used (area: Ref ratio) is 0.091, and the Ag reduction rate is 90.9%. As a result of the measurement, the cell output was 16.04%, which was a good result.
  • Example 2 In Example 1, the width of the Ag electrode was 0.5 mm and the pitch was 2.2 mm. As a result, the amount of Ag used (area: Ref ratio) is 0.227, and the Ag reduction rate is 77.3%. As a result of the measurement, the cell output was 16.12%, which was a good result.
  • Example 3 In Example 3, the width of the Ag electrode was 1.0 mm and the pitch was 2.2 mm. The amount of Ag used (area: Ref ratio) is 0.455, and the Ag reduction rate is 54.5%. As a result of the measurement, the cell output was 16.09%, which was a favorable result.
  • Example 4 In Example 4, the width of the Ag electrode was 0.1 mm and the pitch was 2.2 mm. The amount of Ag used (area: Ref ratio) is 0.045, and the Ag reduction rate is 95.5%. As a result of the measurement, the cell output was 15.95%, which was a good result.
  • Example 5 In Example 5, the width of the Ag electrode was 1.5 mm and the pitch was 2.2 mm. The amount of Ag used (area: Ref ratio) is 0.682, and the Ag reduction rate is 31.8%. As a result of the measurement, the cell output was 16.11%.
  • Comparative Example 1 is an example in which an Ag electrode is provided over the entire length of the tab wire joining region, and the amount of Ag used in this case is 1.
  • the cell output of 16.10% in Comparative Example 1 is a good / defective judgment criterion in Examples 1 to 4.

Abstract

Le problème abordé par l'objet de la présente invention est de réduire la quantité de pâte d'Ag utilisée sur une surface arrière d'une cellule et de réduire le coût d'une cellule tout en assurant le rendement de la cellule et la force de connexion de la surface arrière à une interconnexion couplée. La solution selon la présente invention est un élément de batterie solaire (1) selon lequel, par rapport à un élément de batterie solaire qui comprend au moins une électrode en forme de doigt, une électrode d'Al (2) est disposée sur une surface arrière, une ouverture (2a) est appliquée à une zone de connexion le long de la zone de connexion, laquelle est connectée par une interconnexion couplée, et une électrode d'Ag (3) est disposée afin de s'étendre sur l'ouverture (2a). La largeur de l'électrode d'Ag peut être comprise entre 0,1 et 1,5 mm et de préférence entre 0,2 et 1,0 mm.
PCT/JP2014/004569 2013-09-11 2014-09-05 Élément de batterie solaire, module de batteries solaires et procédé de production d'un module de batteries solaires WO2015037213A1 (fr)

Applications Claiming Priority (2)

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JP2013-187973 2013-09-11
JP2013187973A JP2015056463A (ja) 2013-09-11 2013-09-11 太陽電池セル、太陽電池モジュール及びその製造方法

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Publication number Priority date Publication date Assignee Title
CN105006492A (zh) * 2015-07-24 2015-10-28 苏州宇邦新型材料股份有限公司 分段拉花式焊带及其光伏组件和制备方法
JP2017120810A (ja) * 2015-12-28 2017-07-06 日立化成株式会社 太陽電池セル及び太陽電池モジュール
CN107195713B (zh) * 2017-06-06 2023-11-24 合肥协鑫集成新能源科技有限公司 光伏叠瓦组件

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JPH10144943A (ja) * 1996-11-12 1998-05-29 Sharp Corp 太陽電池セルおよびその製造方法
JP2002043596A (ja) * 2000-07-28 2002-02-08 Kyocera Corp 太陽電池素子
JP2004031740A (ja) * 2002-06-27 2004-01-29 Kyocera Corp 太陽電池素子および太陽電池モジュール
WO2007001004A1 (fr) * 2005-06-29 2007-01-04 Mitsubishi Electric Corporation Cellule pour pile solaire
JP2008294383A (ja) * 2006-10-13 2008-12-04 Hitachi Chem Co Ltd 太陽電池セルの接続方法及び太陽電池モジュール
JP2012244175A (ja) * 2011-05-20 2012-12-10 Lg Electronics Inc 太陽電池及び太陽電池モジュール
JP2013098230A (ja) * 2011-10-28 2013-05-20 Dexerials Corp 導電性接着剤、太陽電池モジュール、及び太陽電池モジュールの製造方法

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DE102011001999A1 (de) * 2011-04-12 2012-10-18 Schott Solar Ag Solarzelle

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Publication number Priority date Publication date Assignee Title
JPH10144943A (ja) * 1996-11-12 1998-05-29 Sharp Corp 太陽電池セルおよびその製造方法
JP2002043596A (ja) * 2000-07-28 2002-02-08 Kyocera Corp 太陽電池素子
JP2004031740A (ja) * 2002-06-27 2004-01-29 Kyocera Corp 太陽電池素子および太陽電池モジュール
WO2007001004A1 (fr) * 2005-06-29 2007-01-04 Mitsubishi Electric Corporation Cellule pour pile solaire
JP2008294383A (ja) * 2006-10-13 2008-12-04 Hitachi Chem Co Ltd 太陽電池セルの接続方法及び太陽電池モジュール
JP2012244175A (ja) * 2011-05-20 2012-12-10 Lg Electronics Inc 太陽電池及び太陽電池モジュール
JP2013098230A (ja) * 2011-10-28 2013-05-20 Dexerials Corp 導電性接着剤、太陽電池モジュール、及び太陽電池モジュールの製造方法

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