WO2014155413A1 - Procédé de fabrication d'un ruban de connexion - Google Patents

Procédé de fabrication d'un ruban de connexion Download PDF

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Publication number
WO2014155413A1
WO2014155413A1 PCT/JP2013/002015 JP2013002015W WO2014155413A1 WO 2014155413 A1 WO2014155413 A1 WO 2014155413A1 JP 2013002015 W JP2013002015 W JP 2013002015W WO 2014155413 A1 WO2014155413 A1 WO 2014155413A1
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WO
WIPO (PCT)
Prior art keywords
tab wire
tab
wire
post
molding
Prior art date
Application number
PCT/JP2013/002015
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English (en)
Japanese (ja)
Inventor
直人 今田
大裕 岩田
Original Assignee
三洋電機株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 三洋電機株式会社 filed Critical 三洋電機株式会社
Priority to PCT/JP2013/002015 priority Critical patent/WO2014155413A1/fr
Priority to PCT/JP2014/001093 priority patent/WO2014155973A1/fr
Publication of WO2014155413A1 publication Critical patent/WO2014155413A1/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
    • H01L31/04—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
    • H01L31/0508—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 the interconnection means having a particular shape
    • 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
    • H01L31/054—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means
    • H01L31/0547—Optical elements directly associated or integrated with the PV cell, e.g. light-reflecting means or light-concentrating means comprising light concentrating means of the reflecting type, e.g. parabolic mirrors, concentrators using total internal reflection
    • 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
    • Y02E10/52—PV systems with concentrators

Definitions

  • the present invention relates to a tab wire manufacturing technique, and more particularly to a tab wire manufacturing method for connecting a plurality of solar cells.
  • Adjacent solar cells are connected in series by tab wires. Since the tab line is also provided on the light receiving surface side of the solar cell, the tab line causes an optical loss of the solar cell.
  • the specular reflectivity of the tab line is lowered, so that the re-incidence rate of light to the solar cell is lowered.
  • an insulator such as an oxide film
  • the present invention has been made in view of such a situation, and an object thereof is to provide a technique for reducing the presence of fine irregularities on the surface of a tab wire.
  • a method for manufacturing a tab wire is a method for manufacturing a tab wire for connecting electrodes provided in each of a plurality of solar cells, and by plastic working. Forming a tab line, and performing polishing using a solution on the surface of the formed tab line.
  • the presence of fine irregularities on the surface of the tab wire can be reduced.
  • FIGS. 1A to 1E are diagrams showing a manufacturing process of a tab wire according to Embodiment 1 of the present invention. It is sectional drawing to which the tab line after shaping
  • FIGS. 4A to 4D are diagrams showing the manufacturing process of the tab wire according to the comparative example of Example 1 of the present invention. It is sectional drawing which shows the solar cell module which uses the tab wire after chemical polishing of FIG.1 (e). It is a top view which shows the surface of the solar cell of FIG. It is sectional drawing of the direction different from FIG. 5 of the solar cell module which uses the tab wire after chemical polishing of FIG.1 (e).
  • FIGS. 9A to 9D are diagrams showing the tab wire manufacturing process according to the second embodiment of the present invention. It is sectional drawing to which the tab line after shaping
  • Example 1 An outline will be given before specifically explaining the first embodiment of the present invention.
  • Example 1 relates to a technique for manufacturing a tab wire for connecting bus bar electrodes provided in each of a plurality of solar cells.
  • a silver-plated copper wire is often plastically processed, but in Example 1, an aluminum wire is plastically processed for the purpose of cost reduction. Fine irregularities exist on the surface of the aluminum tab wire formed by plastic working. In order to reduce the presence of such fine irregularities, in Example 1, chemical polishing is performed on the surface of the formed tab wire.
  • the solar cell module using such a tab wire is explained.
  • FIGS. 1A to 1E show the manufacturing process of the tab wire according to the first embodiment.
  • Fig.1 (a) shows the side view of the aluminum wire 200 used as the raw material of a tab wire.
  • FIG. 1B is a cross-sectional view of the aluminum wire 200 taken along the cross-sectional line AA in FIG.
  • the cross section of the aluminum wire 200 is circular.
  • the left and right directions in FIG. 1A are referred to as “length directions”, and the left and right directions in FIG. 1B are referred to as “width directions”.
  • the vertical direction of (b) is referred to as the “thickness direction”.
  • a post-molding tab line 202 in FIG. 1C is a cross-sectional view corresponding to FIG.
  • Plastic working is an operation for forming a predetermined shape by applying plastic deformation to a part or the whole of a metal material, and includes rolling, extruding, pressing and the like. Here, it is shaped by a roller. Further, the post-molded tab wire 202 having a final shape is molded by one plastic working, and no further molding process is performed after this molding process.
  • the tab wire 202 has irregularities on one side as a final shape as shown in FIG.
  • the convex portions of the unevenness on the one surface side have a mountain shape such as a substantially pyramid shape or a substantially conical shape, and the plurality of convex portions are arranged in the width direction and the length direction of the tab wire 202 after molding.
  • FIG. 2 is an enlarged cross-sectional view of the tab wire 202 after molding.
  • the raw material of the tab wire 202 after molding is aluminum, and since aluminum has high malleability, many fine irregularities are generated on the molded surface.
  • the term “fine” means that it is sufficiently smaller than a substantially pyramid shape or a substantially conical shape provided on one surface side of the tab wire 202 after molding.
  • the term “fine” may mean that the post-molding tab wire 202 is sufficiently smaller than the shortest length in the length direction, width direction, and thickness direction. Due to such fine irregularities, as described above, the specular reflectance of the surface of the tab wire 202 after molding is lowered. As a result, the light re-incidence rate of the solar cells connected by such post-molded tab wires 202 becomes low.
  • an oxide film (not shown) is formed on the surface of the tab wire 202 after molding, but the thickness of the oxide film is not uniform due to fine unevenness. As a result, a thin portion of the oxide film is generated, and the insulating property is lowered in that portion.
  • the post-annealed tab line 204 of FIG. 1D is generated.
  • Annealing is an operation of heating to an appropriate temperature and maintaining that temperature, and then gradually cooling to improve the mechanical properties of the metal material.
  • the annealing is performed for the purpose of increasing the crystal grain size.
  • the post-chemical polishing tab line 206 of FIG. 1E is generated.
  • Chemical polishing is a method for obtaining a smooth glossy surface by dissolving fine irregularities on the metal surface prior to the recess, and in particular a method for chemically polishing the metal surface by dipping in a polishing liquid. It is.
  • FIG. 3 is an enlarged cross-sectional view of the tab line 206 after chemical polishing.
  • An oxide film layer 210 is formed so as to enclose the central aluminum portion 208.
  • the oxide film layer 210 is not formed by natural oxidation in the tab wire 202 after molding, but is formed by chemical polishing as an oxidation process.
  • the tab wire 206 after chemical polishing is cleaned.
  • FIGS. 4A to 4D show the manufacturing process of the tab wire according to the comparative example of Example 1 of the present invention.
  • FIG. 4A shows a cross-sectional view of the silver-plated copper wire 300.
  • the direction of the cross section in FIG. 4A is the same as that in FIG.
  • the side view of the silver plated copper wire 300 is omitted, it is shown in the same manner as FIG.
  • the “length direction”, “width direction”, and “thickness direction” are determined in the same manner as before.
  • the tab wire 302 after the first forming in FIG. 4B is formed.
  • the first post-molding tab wire 302 has a quadrangular shape as shown in FIG.
  • the second post-molding tab wire 304 of FIG. 4C is formed.
  • the second post-molding tab wire 304 has irregularities on one surface side, like the post-molding tab wire 202 of FIG.
  • the post-annealed tab line 306 in FIG. 4D is generated by annealing the second post-molding tab line 304. Since silver is highly chemically resistant, chemical polishing cannot be performed on silver-plated copper. Therefore, chemical polishing is not performed on the post-annealed tab wire 306.
  • FIG. 5 is a cross-sectional view showing a solar cell module using the tab wire 206 after chemical polishing.
  • the solar cell module 100 includes a plurality of solar cells 70, tab wires 40, resin layers 50 a and 50 b (hereinafter collectively referred to as a resin layer 50), a protective substrate 62, a back sheet 64, and a sealing layer 66.
  • the solar cell 70 includes the power generation layer 10, the first electrode 20, and the second electrode 30.
  • the tab line 40 in FIG. 5 corresponds to the post-chemical polishing tab line 206 in FIG.
  • the power generation layer 10 is a layer that absorbs incident light and generates a photovoltaic force, and includes, for example, a substrate made of a semiconductor material such as crystalline silicon, gallium arsenide (GaAs), or indium phosphorus (InP).
  • a substrate made of a semiconductor material such as crystalline silicon, gallium arsenide (GaAs), or indium phosphorus (InP).
  • the structure of the power generation layer 10 is not particularly limited, but in the present embodiment, it has a heterojunction of an n-type single crystal silicon substrate and amorphous silicon.
  • the power generation layer 10 is, for example, an i-type amorphous silicon layer, a p-type amorphous silicon layer doped with boron (B) or the like on the light-receiving surface side of an n-type single crystal silicon substrate, and a light-transmitting material such as indium oxide.
  • boron B
  • a light-transmitting material such as indium oxide.
  • transparent conductive layers made of conductive conductive oxide.
  • an i-type amorphous silicon layer, an n-type amorphous silicon layer doped with phosphorus (P) or the like, and a transparent conductive layer are laminated on the back side of the substrate in this order.
  • the power generation layer 10 has a light receiving surface 12 that is one of the surfaces of the solar cell 70 and a back surface 14 that is one of the surfaces of the solar cell 70 and faces away from the light receiving surface 12.
  • the light receiving surface means a main surface on which solar light is mainly incident in the solar cell 70, and specifically, a surface on which most of the light incident on the power generation layer 10 is incident.
  • the first electrode 20 and the second electrode 30 are provided on the light receiving surface 12 and the back surface 14 as electrodes provided on the surface of the solar cell 70, respectively, and take out the electric power generated by the power generation layer 10 to the outside.
  • the first electrode 20 and the second electrode 30 are conductive materials including, for example, copper (Cu) and aluminum (Al).
  • An electrolytic plating layer such as copper (Cu) or tin (Sn) may be included.
  • the present invention is not limited to this, and other metals such as gold and silver, other conductive materials, or combinations thereof may be used.
  • the tab wire 40 is adhered on the surface by the resin layer 50 so as to be electrically connected to the first electrode 20 or the second electrode 30.
  • the tab wire 40 and the 1st electrode 20 or the 2nd electrode 30 are adhere
  • conductive particles such as nickel are included in the resin layer 50, the tab wire 40 and the first electrode 20 or the second electrode 30 may not be directly bonded.
  • the tab wire 40 extends in the x direction in which the plurality of solar cells 70 are arranged, and connects the first electrode 20 of one solar cell 70 adjacent to the x direction and the second electrode 30 of the other solar cell 70. .
  • the tab wire 40 includes an extending portion 42, a bent portion 43, and an end portion 44.
  • the extending part 42 extends in the x direction along the light receiving surface 12 or the back surface 14 and is bonded to the light receiving surface 12 or the back surface 14 via the resin layer 50. More specifically, the extending part 42 is disposed on the bus bar electrode of the first electrode 20 or the second electrode 30 and is bonded in direct contact with at least a part of the bus bar electrode so as to be electrically connected to the bus bar electrode. Is done.
  • the end portion 44 is provided on the light receiving surface 12 or the back surface 14 where the extending portion 42 is provided, and is disposed in a region near the outer periphery of the solar cell 70.
  • the bent portion 43 has a step corresponding to the thickness of the solar cell 70.
  • the protective substrate 62 is provided on the light receiving surface 12 side of the solar cell 70, protects the solar cell 70 from the external environment, and transmits light in a wavelength band that the solar cell 70 absorbs for power generation.
  • the protective substrate 62 is, for example, a glass substrate.
  • the back sheet 64 and the sealing layer 66 are resin materials such as ethylene vinyl acetate copolymer (EVA), polyvinyl butyral (PVB), polyimide, polyethylene, polypropylene, and polyethylene terephthalate (PET). This prevents moisture from entering the solar cell 70 and improves the strength of the entire solar cell module 100.
  • the back sheet 64 may be the same glass as the protective substrate 62 or a transparent substrate such as plastic. Further, by providing a metal foil or the like between the back sheet 64 and the sealing layer 66 so that a large amount of light incident from the protective substrate 62 side is absorbed by the solar cell 70, the back sheet 64 is transmitted through the solar cell 70. The light reaching the solar cell 70 may be reflected to the solar cell 70.
  • FIG. 6 is a plan view showing the surface of the solar cell 70.
  • the first electrode 20 includes three bus bar electrodes 24 extending in parallel to each other in a first direction (x direction) and a plurality of finger electrodes 22 extending in a second direction (y direction) orthogonal to the bus bar electrodes 24.
  • the finger electrode 22 is an electrode formed on the light receiving surface 12, it is desirable to form the finger electrode 22 so as not to block light incident on the power generation layer 10. In addition, it is desirable to arrange the generated power at predetermined intervals so that the generated power can be collected efficiently.
  • the bus bar electrode 24 connects the plurality of finger electrodes 22 to each other.
  • the bus bar electrode 24 is formed to be thin to the extent that the light incident on the power generation layer 10 is not blocked, and is thickened to some extent so that the power collected from the plurality of finger electrodes 22 can flow efficiently.
  • the tab wire 40 is bonded to the bus bar electrode 24 and covers the bus bar electrode 24.
  • the second electrode 30 also includes three bus bar electrodes extending in the x direction parallel to each other, and extending in the y direction orthogonal to the bus bar electrodes. A plurality of finger electrodes are provided.
  • the number of finger electrodes of the second electrode 30 is increased by increasing the number of the first electrodes 20 on the light receiving surface 12 side, The current collection efficiency can be increased.
  • the tab wire 40 is bonded to the bus bar electrode of the second electrode 30.
  • FIG. 7 is a cross-sectional view of the solar cell module using the post-chemical polishing tab wire 206 in a direction different from that of FIG. This corresponds to a cross-sectional view taken along a cross-sectional line AA in FIG.
  • the resin layers 50a and 50b are provided on each of the light receiving surface 12 and the back surface 14, and adhere the light receiving surface 12 or the back surface 14 and the tab wire 40 extending thereon.
  • the resin layer 50 is an adhesive layer obtained by curing a resin adhesive.
  • a thermosetting resin material having adhesiveness such as an epoxy resin, an acrylic resin, or a urethane resin is used.
  • the resin layer 50a is provided in contact with the bus bar electrode 24 and bonds the bus bar electrode 24 and the tab wire 40 together.
  • the resin layer 50 a is at least in contact with the lower surface 40 a of the tab wire 40, and the tab wire 40 is bonded to the light receiving surface 12 in a state where the tab wire 40 is in contact with the bus bar electrode 24.
  • the aluminum portion 208 is enclosed by the oxide film layer 210. Since the oxide film layer 210 is insulative, conduction between the bus bar electrode 24 and the tab wire 40 is prevented. Therefore, here, the bus bar electrode 24 and the aluminum portion 208 are in direct contact with each other by partly breaking through the oxide film layer 210 by the bus bar electrode 24.
  • the resin layer 50 a is provided with a width in the y direction perpendicular to the x direction in which the bus bar electrode 24 extends wider than the width of the bus bar electrode 24.
  • the resin layer 50b is provided in contact with the bus bar electrode 34, and bonds the bus bar electrode 34 and the tab wire 40 together.
  • the surface of the tab wire 40 bonded to the bus bar electrode 34 is different from the surface of the tab wire 40 bonded to the bus bar electrode 24.
  • the latter is the lower surface 40a, while the former is the upper surface 40b.
  • the resin layer 50 b is at least in contact with the upper surface 40 b of the tab wire 40, and the tab wire 40 is bonded to the back surface 14 in a state where the tab wire 40 is in contact with the bus bar electrode 34.
  • the bus bar electrode 34 and the aluminum portion 208 are in direct contact with each other by partly breaking through the oxide film layer 210 by the bus bar electrode 34 and the aluminum portion 208. As described above, a part of the oxide film layer 210 on the upper surface 40b side is pierced by the aluminum portion 208 and the bus bar electrode 34, but the oxide film layer 210 on the lower surface 40a side is held as it is. By maintaining the oxide film layer 210, the insulation between the tab wire 40 and the back sheet 64 is also maintained.
  • FIG. 8 is a flowchart showing the manufacturing procedure of the tab wire according to the first embodiment of the present invention.
  • a forming process for forming the tab line is executed (S10).
  • An annealing process for annealing the formed tab line is executed (S12).
  • a chemical polishing process for chemically polishing the annealed tab wire is performed (S14).
  • the manufacturing procedure of the solar cell module 100 will be described.
  • a plurality of solar cells 70 are prepared, and an adhesive for adhering the tab wires 40 is applied to the surface of the solar cells 70.
  • the adhesive is applied by discharging means such as a dispenser or screen printing so as to cover the bus bar electrode 24.
  • the adhesive is a resin adhesive film
  • the resin adhesive film may be attached so as to cover the bus bar electrode 24.
  • the tab line 40 is disposed on the bus bar electrode 24.
  • the tab wire 40 is pressed while the lower surface 40a is in contact with the bus bar electrode 24, and the adhesive is cured by heating. As a result, the adhesive is cured to form the resin layer 50a, whereby the resin layer 50 is formed.
  • the tab wire 40 is bonded to the bus bar electrode of the second electrode 30 provided on the back surface 14 by the same procedure as before.
  • the plurality of solar cells 70 connected to the tab wire 40 are sealed.
  • a resin sheet and a protective substrate 62 constituting a part of the sealing layer 66 are disposed on the light receiving surface 12 side of the plurality of solar cells 70 to which the tab wires 40 are connected, and a part of the sealing layer 66 is disposed on the back surface 14 side.
  • a resin sheet and a back sheet 64 are arranged.
  • Example 1 since chemical polishing is performed, the presence of fine irregularities on the surface of the tab wire can be reduced. Moreover, since the presence of fine irregularities on the surface of the tab line is reduced, the thickness of the oxide film can be made uniform. In addition, since the thickness of the oxide film is uniform, it is possible to suppress a decrease in insulation. Moreover, since the tab wire having the unevenness on the one surface side is manufactured while the presence of fine unevenness on the surface of the tab wire is reduced, the light re-incidence rate of the solar cell can be improved. Further, since the final shape is generated by molding by plastic working, the number of processing steps can be reduced.
  • the processing can be simplified. Further, since an aluminum material is used as a raw material, chemical polishing can be easily performed. Moreover, since an aluminum material is used as a raw material, cost can be reduced. Also, since annealing is performed, the crystal grain size can be increased, and smoother chemical polishing can be performed. By producing a solar cell module using a tab wire having any one of these functions and effects, the same functions and effects can be obtained.
  • Example 2 of this invention is related to the technique for manufacturing a tab wire similarly to Example 1.
  • FIG. 2 the shape of the tab line manufactured in Example 2 is different from the shape of the tab line manufactured in Example 1. Below, it demonstrates focusing on the difference with Example 1.
  • FIG. 1 illustrates focusing on the difference with Example 1.
  • FIGS. 9A to 9D show the manufacturing process of the tab wire according to the second embodiment of the present invention.
  • Fig.9 (a) shows sectional drawing of the aluminum wire 200 used as the raw material of a tab wire.
  • the direction of the cross section in FIG. 9A is the same as that in FIG.
  • the side view of the aluminum wire 200 is omitted, it is shown in the same manner as in FIG.
  • the “length direction”, “width direction”, and “thickness direction” are determined in the same manner as before.
  • FIG. 10 is an enlarged cross-sectional view of the tab wire 202 after molding. Also in the post-molding tab line 202, many fine irregularities are generated on the molded surface, as in FIG. Returning to FIG.
  • FIG. 11 is an enlarged cross-sectional view of the tab line 206 after chemical polishing. Also in FIG. 11, the oxide film layer 210 is formed so as to wrap around the central aluminum portion 208.
  • the tab wire 202 after forming, the tab wire 204 after annealing, and the tab wire 206 after chemical polishing in Example 2 are the same except for the cross-sectional shape of FIGS. 1C to 1E. Then, explanation is omitted.
  • Example 2 by performing chemical polishing, it is possible to reduce the presence of fine irregularities on the surface of the tab line, even for a tab line having a square cross section. Further, the tab wire can be easily manufactured by making the cross section square.
  • Example 3 of this invention is related with the technique for manufacturing a tab wire as before. So far, the tab wire has been formed by one plastic working. On the other hand, in Example 3, the tab wire is formed by plastic processing a plurality of times, for example, twice. Below, it demonstrates centering on the difference from before.
  • FIGS. 12A to 12E show the manufacturing process of the tab wire according to the third embodiment of the present invention.
  • Fig.12 (a) shows sectional drawing of the aluminum wire 200 used as the raw material of a tab wire. This is the same as in FIG.
  • the first post-molding tab line 220 in FIG. 12B has a quadrangular shape as an intermediate shape.
  • a sectional view in which the tab wire 220 after the first molding is enlarged is the same as FIG.
  • the second post-molding tab line 222 of FIG. 12C is formed.
  • molding of FIG.12 (c) has an unevenness
  • An enlarged cross-sectional view of the finger electrode 22 is the same as FIG.
  • the post-annealed tab line 204 in FIG. 12D is generated.
  • the post-chemical polishing tab line 206 of FIG. 12E is generated.
  • An enlarged cross-sectional view of the tab line 206 after chemical polishing is the same as FIG.
  • the first post-molding tab line 220, the second post-molding tab line 222, the post-annealing tab line 204, and the post-chemical polishing tab line 206 in Example 3 are shown in FIGS. 9B and 1C. Since this is the same as (e), the description is omitted here.
  • Example 3 by performing chemical polishing, it is possible to reduce the presence of fine irregularities on the surface of the tab line, even if the tab line has been formed in multiple stages. In addition, since a plurality of stages of molding is performed, the equipment can be used when a plurality of stages of molding has been performed.
  • an aluminum wire 200 that is, an aluminum material is used as a raw material.
  • the present invention is not limited to this.
  • raw materials other than aluminum materials may be used.
  • a raw material other than the aluminum material a material having a small ionization tendency is preferable.
  • unplated copper can be used. According to this modification, even when various raw materials are used, the presence of fine irregularities on the surface of the tab wire can be reduced.
  • annealing is performed after molding.
  • the present invention is not limited to this.
  • annealing may not be performed.
  • chemical polishing may be performed on the formed tab wire.
  • chemical polishing may be performed after the formed tab wire is further processed differently from annealing. According to this modification, the degree of freedom of processing can be improved.
  • Examples 1 to 3 of the present invention chemical polishing is performed.
  • electrolytic polishing may be performed instead of chemical polishing or in addition to chemical polishing.
  • Electropolishing is a method in which a metal surface is polished by dipping in a polishing liquid and electrolyzing with an anode. Such electrolytic polishing can be said to be polishing using a solution, similar to chemical polishing. According to this modification, the degree of freedom of processing can be improved.
  • Example 3 of the present invention the molding process is performed twice.
  • the present invention is not limited to this, and for example, three or more molding processes may be performed. According to this modification, the degree of freedom of processing can be improved.
  • 10 power generation layer 12 light-receiving surface, 14 back surface, 20 first electrode, 22 finger electrode, 24 bus bar electrode, 30 second electrode, 34 bus bar electrode, 40 tab wire, 40 a lower surface, 40 a lower surface, 40 b upper surface, 42 extension, 43 bent Part, 44 end, 50, 50a, 50b resin layer, 62 protective substrate, 64 backsheet, 66 sealing layer, 70 solar cell, 100 solar cell module, 200 aluminum wire, 202 post-molded tab wire, 204 post-annealed tab Wire, 206, tab wire after chemical polishing, 208 aluminum part, 210 oxide film layer.
  • the presence of fine irregularities on the surface of the tab wire can be reduced.

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  • Condensed Matter Physics & Semiconductors (AREA)
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Abstract

L'invention porte sur le procédé de fabrication d'un ruban de connexion destiné à connecter des électrodes prévues pour une pluralité de piles solaires. En premier lieu, un ruban de connexion de post-démoulage (202) est formé par travail plastique d'un fil d'aluminium (200). Ensuite, un ruban de connexion de post-recuit(204) est formé par recuit du ruban de connexion de post-démoulage (202). De plus, un ruban de connexion de post-polissage-chimique (206) est formé par polissage à l'aide d'une solution de la surface du ruban de connexion de post-recuit (204).
PCT/JP2013/002015 2013-03-25 2013-03-25 Procédé de fabrication d'un ruban de connexion WO2014155413A1 (fr)

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PCT/JP2013/002015 WO2014155413A1 (fr) 2013-03-25 2013-03-25 Procédé de fabrication d'un ruban de connexion
PCT/JP2014/001093 WO2014155973A1 (fr) 2013-03-25 2014-02-28 Procédé de production de baguette de soudure, procédé de production de module de cellules solaires et module de cellules solaires

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Application Number Priority Date Filing Date Title
PCT/JP2013/002015 WO2014155413A1 (fr) 2013-03-25 2013-03-25 Procédé de fabrication d'un ruban de connexion

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WO2014155413A1 true WO2014155413A1 (fr) 2014-10-02

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PCT/JP2014/001093 WO2014155973A1 (fr) 2013-03-25 2014-02-28 Procédé de production de baguette de soudure, procédé de production de module de cellules solaires et module de cellules solaires

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