WO2012165464A1 - 太陽電池セル、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 - Google Patents

太陽電池セル、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 Download PDF

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Publication number
WO2012165464A1
WO2012165464A1 PCT/JP2012/063895 JP2012063895W WO2012165464A1 WO 2012165464 A1 WO2012165464 A1 WO 2012165464A1 JP 2012063895 W JP2012063895 W JP 2012063895W WO 2012165464 A1 WO2012165464 A1 WO 2012165464A1
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WIPO (PCT)
Prior art keywords
alignment mark
solar cell
back surface
tab line
manufacturing
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PCT/JP2012/063895
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English (en)
French (fr)
Japanese (ja)
Inventor
鶴岡　恭生
竹村　賢三
雄介 淺川
正規 藤井
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日立化成工業株式会社
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Priority to JP2012547373A priority Critical patent/JP5181225B2/ja
Publication of WO2012165464A1 publication Critical patent/WO2012165464A1/ja

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L23/00—Details of semiconductor or other solid state devices
    • H01L23/544—Marks applied to semiconductor devices or parts, e.g. registration marks, alignment structures, wafer maps
    • 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
    • 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
    • H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
    • H01L31/1876—Particular processes or apparatus for batch treatment of the devices
    • H01L31/188—Apparatus specially adapted for automatic interconnection of solar cells in a module
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
    • H01L2223/544—Marks applied to semiconductor devices or parts
    • H01L2223/54426—Marks applied to semiconductor devices or parts for alignment
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2223/00—Details relating to semiconductor or other solid state devices covered by the group H01L23/00
    • H01L2223/544—Marks applied to semiconductor devices or parts
    • H01L2223/54473—Marks applied to semiconductor devices or parts for use after dicing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
    • H01L2924/0001—Technical content checked by a classifier
    • H01L2924/0002—Not covered by any one of groups H01L24/00, H01L24/00 and H01L2224/00
    • 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 battery cell, a solar battery module, and a method for manufacturing a solar battery module.
  • This solar cell is usually formed by connecting a plurality of solar cells in series or in parallel.
  • a plurality of linear electrodes (finger electrodes) made of Ag for obtaining an output are formed in parallel on the surface (light receiving surface) of the solar battery cell.
  • a back electrode made of Al is formed on the back surface so as to cover the entire surface.
  • a metal wiring member (TAB line) is connected to the light receiving surface of one solar cell so as to be orthogonal to all the finger electrodes, and this TAB line is connected to the other solar cell. Adjacent solar cells are connected to each other by being connected to the back electrode.
  • JP 2002-263880 A JP 2004-204256 A JP-A-8-330615 JP 2003-133570 A JP 2005-243935 A JP 2007-265635 A
  • solder showing good conductivity has been used for connection of TAB wires (Patent Document 1).
  • Sn-Ag-Cu solder not containing Pb is sometimes used in consideration of environmental problems (Patent Documents 1 and 2).
  • heat of about 220 ° C. or higher is applied to the solar cells, which may cause a decrease in the yield of the connection process and warpage of the solar cells.
  • the manufacturing cost increases.
  • an electrode made of Ag in advance at the position where the TAB line is arranged on the front and back surfaces of the solar battery cell. (Busper electrode) must be formed.
  • Ag is expensive, the manufacturing cost increases.
  • the electric resistance of Ag is large, if the bus bar electrode is thin, the sheet resistance of the bus bar electrode increases. If it does so, the power loss in a bus-bar electrode will increase and the power generation performance of a photovoltaic cell will fall. For this reason, in order to suppress the sheet resistance of the bus bar electrode, it is necessary to increase the width of the bus bar electrode to some extent, which further increases the manufacturing cost.
  • This conductive adhesive is a composition in which metal particles such as Al particles are mixed and dispersed in a thermosetting resin, and the metal particles are sandwiched between the TAB wire and the electrode of the solar battery cell, and the electric adhesive is used. Connection is realized.
  • the conductive adhesive is used for the connection of the TAB line, since the connection can be performed at 200 ° C. or lower, the yield of the connection process is reduced and the solar cell is prevented from warping. Further, when the conductive adhesive is used for the connection of the TAB wire, it is not necessary to secure the wettability, so that the busper electrode formed for securing the wettability is unnecessary, and the use of Ag is reduced. .
  • the connection position of the TAB line cannot be confirmed, and the TAB line may not be attached to the planned position with high accuracy. If the TAB line cannot be pasted at a predetermined position, the array of solar cells meanders, and residual stress is generated in the solar cells, which may reduce the manufacturing yield. On the other hand, it is conceivable that an alignment mark for alignment is separately formed at a predetermined bonding position. However, if the alignment mark forming process is complicated, the manufacturing cost increases.
  • the present invention has been made in order to solve such a problem, and is capable of accurately connecting a TAB line to a predetermined position, and can suppress an increase in manufacturing cost.
  • the purpose is to provide.
  • a solar cell includes a substrate, a plurality of finger electrodes formed on a light receiving surface of the substrate, a back surface of the substrate, and a plurality of finger electrodes on an adjacent cell and a conductive adhesive. And a back surface electrode connected by adhering the first TAB line, wherein a part of the back surface of the substrate is at a position on the light receiving surface to which the second TAB line is connected. It is exposed at the corresponding position, and the exposed portion constitutes an alignment mark on the back surface that indicates the position where the first TAB line is adhered.
  • a solar battery cell includes a substrate, a plurality of finger electrodes formed on a light receiving surface of the substrate, a plurality of finger electrodes on the adjacent cell and a conductive adhesive covering the back surface of the substrate.
  • a back surface electrode connected by adhering the first TAB line via the at least one alignment mark indicating a position where the first TAB line is adhered The at least one alignment mark may have a width smaller than the width of the first TAB line.
  • a solar cell according to one aspect of the present invention includes a substrate, a plurality of finger electrodes formed in parallel to each other on a light receiving surface of the substrate, and a back electrode formed over the entire back surface of the substrate.
  • An exposed portion may be formed, and the exposed portion may be an alignment mark indicating a connection position of the TAB line on the back surface.
  • an exposed portion where the substrate is exposed corresponding to the connection position of the TAB line on the light receiving surface is formed on the back surface, and the exposed portion defines the connection position of the TAB line on the back surface.
  • the alignment mark is shown. Therefore, the TAB line can be accurately connected to the planned position. Further, the alignment mark can be easily formed by not applying the electrode material to the portion that becomes the alignment mark when forming the back electrode. Therefore, an increase in manufacturing cost can be suppressed.
  • the alignment mark may have a line shape with a line width smaller than the line width of the TAB line to be connected. If it carries out like this, the adhesion area of a TAB line
  • the alignment mark may have a linear shape in which a portion having a line width smaller than the line width of the TAB line to be connected and a portion having a line width equal to or larger than the line width of the TAB line are alternately arranged. If it carries out like this, in the part of the line width more than the line width of a TAB line
  • the alignment mark may have a broken line shape. If it carries out like this, the adhesion area of a TAB line
  • the alignment mark may have a notch shape at the end of the substrate on the extension of the TAB line to be connected. If it carries out like this, when forming a back surface electrode, the part used as an alignment mark can be set easily, and a back surface electrode can be formed easily.
  • a plurality of the solar battery cells are arranged so that the finger electrode of one adjacent solar battery cell and the back electrode of the other solar battery cell are along the alignment mark. Are connected by a TAB wire arranged through a conductive adhesive.
  • the TAB line is accurately connected to the planned position, so that the rows of solar cells can be prevented from meandering. Thereby, when manufacturing a solar cell module, it can suppress that a residual stress generate
  • the solar cell module according to one aspect of the present invention includes a plurality of any of the solar cells described above, and the first TAB line is along an alignment mark of one of the solar cells.
  • the first TAB line is connected as a second TAB line to another solar battery cell among the plurality of solar battery cells through a conductive adhesive. The plurality of finger electrodes are further connected.
  • the manufacturing method of the solar cell module of one side of this invention shows the position where a 2nd TAB line
  • Photovoltaic comprising: an alignment mark provided on the light receiving surface; and a back surface electrode that covers the back surface of the substrate and is connected to a plurality of finger electrodes of adjacent cells by a first TAB line via a conductive adhesive.
  • a substrate is prepared, and a part of the back surface of the substrate is exposed at a position corresponding to a position on the light receiving surface to which the second TAB line is connected, and the exposed part is the first TAB line.
  • attach is comprised, and the 1st TAB line
  • the method for manufacturing a solar cell module according to one aspect of the present invention includes a plurality of finger electrodes arranged on a light receiving surface, and a plurality of adjacent cells covered with a first TAB line through a conductive adhesive covering the back surface of the substrate. And a backside electrode connected to the finger electrode, wherein the backside electrode is arranged to define at least one alignment mark indicating a position to which the first TAB line is adhered.
  • the at least one alignment mark has a width smaller than the width of the first TAB line, and the first electrode is attached to the back electrode via a conductive adhesive at the position indicated by the back surface alignment mark. TAB lines may be connected.
  • the present invention it is possible to provide a solar cell that can accurately connect a TAB line to a predetermined position and can suppress an increase in manufacturing cost.
  • FIG. 4 is a schematic side view of FIG. 3. It is a top view which shows the back surface of the photovoltaic cell concerning 2nd Embodiment of this invention. It is a top view which shows the back surface of the photovoltaic cell which concerns on 3rd Embodiment of this invention. It is a top view which shows the back surface of the photovoltaic cell which concerns on 4th Embodiment of this invention.
  • FIG. 1 is a plan view showing a light receiving surface of a solar cell according to the first embodiment of the present invention
  • FIG. 2 is a bottom view showing the back surface of the solar cell in FIG. 1
  • FIG. 3 is a plurality of solar cells in FIG.
  • FIG. 4 is a schematic side view of FIG. 3.
  • a plurality of solar cells 100 are electrically connected in series or in parallel to form one solar cell module, and have a substrate 2.
  • the substrate 2 has a substantially square shape, and its four corners have an arc shape.
  • One surface of the substrate 2 is a light receiving surface 21 and the other surface is a back surface 22 (see FIG. 2).
  • the substrate 2 is made of at least one of, for example, Si single crystal, polycrystal, and amorphous.
  • the substrate 2 may be an n-type semiconductor or a p-type semiconductor on the light receiving surface 21 side. For example, the distance between two opposing sides of the substrate 2 is 125 mm.
  • a plurality of (for example, 48) linear finger electrodes 3 are disposed on the surface of the light receiving surface 21 so as to be spaced apart from each other in parallel.
  • a TAB wire 4 is connected to the finger electrode 3 via a conductive adhesive film (conductive adhesive) 5 (see FIG. 4).
  • the line width of the finger electrode 3 is, for example, 0.15 mm.
  • An interval df between adjacent finger electrodes 3 is, for example, 2.55 mm.
  • the finger electrode 3 is made of a known material capable of obtaining electrical continuity.
  • the material of the finger electrode 3 includes a glass paste containing silver, a silver paste in which various conductive particles are dispersed in an adhesive resin, a gold paste, a carbon paste, a nickel paste, an aluminum paste, and ITO formed by firing or vapor deposition. Etc. Among these, it is preferable to use a glass paste containing silver from the viewpoint of heat resistance, conductivity, stability, and cost.
  • the adhesion areas SF and SF indicate areas where the conductive adhesive films 5 and 5 are bonded on the light receiving surface 21.
  • the width wc (that is, the width of the conductive adhesive film 5) of the adhesive region SF is, for example, 1.2 mm.
  • the distance dc between the adhesion areas SF, SF is, for example, 62 mm.
  • the width of the TAB line 4 to be connected to the adhesive region SF is, for example, 1.5 mm, which is slightly larger than the width wc of the adhesive region SF (that is, the width of the conductive adhesive film 5). ing. This suppresses the compressed conductive adhesive film 5 from protruding between the light receiving surface 21 and the TAB wire 4 when the TAB wire 4 is pressure-bonded after the conductive adhesive film 5 is adhered to the adhesive region SF. It is to do.
  • light receiving surface alignment marks 6 and 6 are discontinuously provided along a line L intersecting the finger electrodes 3 and 3 located at both ends so as to form a broken line. More specifically, the light-receiving surface alignment mark 6 has a pattern in which portions 61 intersecting with only one finger electrode 3 are continuous along the line L every other finger electrode 3. Yes.
  • the light receiving surface alignment mark 6 indicates the connection position of the TAB line 4 with respect to the finger electrode 3 and is disposed, for example, at the center of the adhesion region SF.
  • the light receiving surface alignment mark 6 is integrally formed with the finger electrode 3 by the same material as the finger electrode 3. That is, the light-receiving surface alignment mark 6 is a glass paste containing silver as described above, a silver paste in which various conductive particles are dispersed in an adhesive resin, a gold paste, a carbon paste, a nickel paste, an aluminum paste, and firing or vapor deposition. Among these, it is preferable to use a glass paste containing silver from the viewpoints of heat resistance, conductivity, stability, and cost.
  • the light receiving surface alignment mark 6 is formed at the same time as the finger electrode 3 is formed.
  • each portion 61 of the light-receiving surface alignment mark 6 is 0.05 mm or more and 0.2 mm or less, and for example, in this embodiment, it is 0.15 mm like the line width of the finger electrode 3. That is, each portion 61 of the light receiving surface alignment mark 6 has a line width equal to or smaller than the line width of the finger electrode 3.
  • the line width of the light receiving surface alignment mark 6 is 0.05 mm or more, visibility can be secured and the light receiving surface alignment mark 6 functions as an alignment mark.
  • the usage-amount of electrode material can fully be reduced as the line
  • the light receiving surface alignment mark 6 has a line width equal to or smaller than the line width of the finger electrode 3, the amount of electrode material used can be further reduced.
  • the line width of each portion 61 of the light receiving surface alignment mark 6 is preferably 20% or less of the line width of the TAB line to be connected.
  • the interval between the light receiving surface alignment marks 6 and 6 is, for example, 62 mm, similar to the interval dc between the adhesion regions SF and SF.
  • the back surface electrode 7 is formed on the entire back surface 22 of the solar battery cell 100.
  • a TAB line 4 is connected to the back electrode 7 via a conductive adhesive film 5 (see FIG. 4).
  • the back electrode 7 is formed, for example, by sintering aluminum paste.
  • the adhesion areas SB and SB indicate areas where the conductive adhesive film 5 is adhered on the back surface 22, and are positions corresponding to the adhesion areas SF on the light receiving surface 21.
  • the width of the bonding area SB is, for example, 1.2 mm, similarly to the width wc (see FIG. 1) of the bonding area SF.
  • the distance between the adhesion areas SB and SB is, for example, about 62 mm, similar to the distance dc (see FIG. 1) between the adhesion areas SF and SF.
  • the width of the TAB line 4 to be connected to the adhesive region SB is, for example, 1.5 mm, similar to the width of the TAB line connected to the light receiving surface 21, which is slightly larger than the width of the adhesive region SB. It is larger.
  • the back surface 22 is provided with an exposed portion where the substrate 2 is exposed corresponding to the connection position of the TAB 4 on the light receiving surface 21, and the exposed portion indicates a back surface alignment mark (alignment) indicating the connection position of the TAB line 4 on the back surface 22.
  • Mark) 71, 71 The back surface alignment mark 71 is linearly provided along the adhesion region SB so as to connect two opposing sides of the substrate 2, and is disposed, for example, at the center of the adhesion region SB.
  • the back surface alignment mark 71 can be easily identified with the naked eye because the color of Al that is the material of the back surface electrode 7 is different from the color of Si that is the material of the substrate 2.
  • the width of the back surface alignment mark 71 needs to be smaller than the width of the TAB line 4.
  • the adhesive area between the conductive adhesive film 5 and the substrate 2 (that is, the width of the back alignment mark 71) is secured to some extent. It is preferable.
  • the width of the back surface alignment mark 71 is preferably about 20% to 80% of the width of the TAB line 4, and is about 0.6 mm in this embodiment, for example.
  • the distance between the back surface alignment marks 71 and 71 is, for example, 62 mm, similar to the distance between the adhesive regions SB and SB.
  • such a solar battery cell 100 includes a plurality of light receiving surface alignment marks 6 and a back surface alignment mark 71 arranged in a line so that the light receiving surface alignment marks 6 and the back surface alignment marks 71 are aligned. They are connected by a TAB line 4 arranged via the conductive adhesive film 5 along the alignment mark 71.
  • the finger electrode 3 on the light receiving surface 21 side of one solar cell 100A and the back electrode 7 on the back surface 22 side of the other solar cell 100B are connected to the TAB line 4.
  • a solar cell module is formed by providing one or a plurality of such rows.
  • the exposed portion where the substrate 2 is exposed corresponding to the connection position of the TAB line 4 on the light receiving surface 21 is formed on the back surface 22, and the exposed portion is on the back surface 22.
  • the back surface alignment mark 71 indicates the connection position of the TAB line 4. Therefore, the connection position of the TAB line 4 can be visually recognized, and the TAB line 4 can be accurately connected to the planned position. Further, when the back electrode 7 is formed, the back surface alignment mark 71 can be easily formed by not applying the electrode material to the portion that becomes the back surface alignment mark 71. Therefore, an increase in manufacturing cost can be suppressed.
  • the back surface alignment mark 71 has a linear shape with a line width smaller than the line width of the TAB line 4 to be connected, so that a bonding area between the TAB line 4 and the substrate 2 is ensured. The mechanical connection strength of the TAB wire 4 can be ensured.
  • the solar cell module formed by the solar cells 100 a plurality of solar cells 100 are arranged, and the finger electrodes 3 of one adjacent solar cell 100 and the back electrode 7 of the other solar cell 100 are provided.
  • the TAB line 4 is disposed via the conductive adhesive film 5 along the light receiving surface alignment mark 6 and the back surface alignment mark 71.
  • the TAB line 4 since the TAB line 4 is accurately connected to the planned position, it is possible to suppress meandering of the rows of solar cells 100. Thereby, when manufacturing a solar cell module, it can suppress that a residual stress generate
  • FIG. 5 is a plan view showing the back surface of the solar battery cell according to the second embodiment of the present invention.
  • the solar cell 200 according to the second embodiment is different from the solar cell 100 according to the first embodiment (see FIG. 2) in that a broken line instead of a linear back surface alignment mark 71. This is that a back-side alignment mark 72 is provided.
  • the back surface alignment mark 72 is provided in a broken line shape along the adhesion region SB so as to connect two opposite sides of the substrate 2.
  • a non-exposed portion N where the substrate 2 is not exposed is interposed between the continuous exposed portions P and P.
  • the line width of the back surface alignment mark 71 may be smaller than the line width of the TAB line 4 or may be equal to or larger than the line width of the TAB line 4, but in order to ensure the mechanical connection strength of the TAB line 4. It is preferable that the width is equal to or larger than the line width of the TAB line 4.
  • the width of the back surface alignment mark 72 is, for example, about 20% to 200% of the width of the TAB line 4 and is about 1.5 mm, which is the same as the width of the TAB line 4 in this embodiment.
  • the length dp of the exposed portion P is, for example, about 0.5 mm to 30 mm, and is about 12 mm in this embodiment.
  • the length dn of the non-exposed portion N is, for example, about 0.5 mm to 30 mm, and is about 12 mm in this embodiment.
  • an exposed portion where the substrate 2 is exposed is formed on the back surface 22 corresponding to the connection position of the TAB line 4 on the light receiving surface 21, and the exposed portion is the TAB line 4 on the back surface 22.
  • the back surface alignment mark 72 indicates the connection position. Therefore, the connection position of the TAB line 4 can be visually recognized, and the TAB line 4 can be accurately connected to the planned position.
  • the back surface alignment mark 72 can be easily formed by not applying an electrode material to the portion that becomes the back surface alignment mark 72 when the back surface electrode 7 is formed. Therefore, an increase in manufacturing cost can be suppressed.
  • the back surface alignment mark 72 has a broken line shape. For this reason, in the exposed part P where the board
  • the solar cell module formed by the solar cells 200 a plurality of solar cells 200 are arranged, and the finger electrodes 3 of one adjacent solar cell 200 and the back electrode 7 of the other solar cell 200 are provided.
  • the TAB line 4 is disposed via the conductive adhesive film 5 along the light receiving surface alignment mark 6 and the back surface alignment mark 72.
  • the TAB line 4 since the TAB line 4 is accurately connected to the planned position, it is possible to suppress meandering of the rows of solar cells 100. Thereby, when manufacturing a solar cell module, it can suppress that a residual stress generate
  • FIG. 6 is a plan view showing the back surface of the solar battery cell according to the third embodiment of the present invention.
  • the solar battery cell 300 according to the third embodiment is different from the solar battery cell 100 (see FIG. 2) according to the first embodiment in that instead of the linear back surface alignment mark 71, The linear back surface alignment mark 73 having a different thickness is provided.
  • the back surface alignment mark 73 is linearly provided along the adhesion region SB so as to connect two opposing sides of the substrate 2.
  • thin line portions 73 a having a line width smaller than the line width of the TAB line 4 and thick line portions 73 b having a line width equal to or larger than the line width of the TAB line 4 are alternately continued.
  • the thin line portions 73 a and 73 a are located at both ends of the back surface alignment mark 73.
  • the width of the thin wire portion 73a is, for example, about 0.6 mm, which is the same as the width of the back surface alignment mark 71 (see FIG. 2) according to the first embodiment.
  • the width of the thick line portion 73b is, for example, 20% to 200% of the width of the TAB line 4, and is about 1.5 mm, which is the same as the width of the TAB line 4 in this embodiment.
  • the length of the thin line portion 73a and the length of the thick line portion 73b are, for example, about 0.5 mm to 30 mm, respectively, and are about 12 mm in this embodiment.
  • an exposed portion where the substrate 2 is exposed is formed on the back surface 22 corresponding to the connection position of the TAB line 4 on the light receiving surface 21, and the exposed portion is the TAB line 4 on the back surface 22.
  • the rear surface alignment mark 73 indicates the connection position. For this reason, the connection position of the TAB line 4 can be visually recognized, and the TAB line 4 can be accurately connected to the planned position. Further, when the back electrode 7 is formed, the back surface alignment mark 73 can be easily formed by not applying the electrode material to the portion that becomes the back surface alignment mark 73. Therefore, an increase in manufacturing cost can be suppressed.
  • the back surface alignment mark 73 includes a thin line portion 73 a having a line width smaller than the line width of the TAB line 4 to be connected and a thick line portion 73 b having a line width equal to or larger than the line width of the TAB line 4. It has a continuous linear shape. For this reason, compared with the photovoltaic cell 100 which concerns on 1st Embodiment, the adhesion area of the TAB line
  • the solar cell module formed by the solar cells 300 a plurality of solar cells 300 are arranged, and the finger electrode 3 of one adjacent solar cell 300 and the back electrode 7 of the other solar cell 300 are provided.
  • the TAB line 4 is disposed via the conductive adhesive film 5 along the light receiving surface alignment mark 6 and the back surface alignment mark 73.
  • the TAB line 4 since the TAB line 4 is accurately connected to the planned position, it is possible to prevent the rows of the solar cells 300 from meandering. Thereby, when manufacturing a solar cell module, it can suppress that a residual stress generate
  • FIG. 7 is a plan view showing the back surface of the solar battery cell according to the fourth embodiment of the present invention.
  • the solar cell 400 according to the fourth embodiment is different from the solar cell 300 according to the third embodiment (see FIG. 6) in that the thin wire portions 73a and 73a are located at both ends.
  • thick line portions 73b and 73b are provided with back surface alignment marks 74 located at both ends.
  • FIG. 8 is a plan view showing the back surface of the solar battery cell according to the fifth embodiment of the present invention.
  • the solar cell 500 according to the fifth embodiment is different from the solar cell 300 according to the third embodiment (see FIG. 6) in that the length of the thin line portion 73a and the length of the thick line portion 73b are different.
  • the back surface alignment mark 75 is provided in which the length of the thick line portion 73b is longer than the length of the thin line portion 73a.
  • the length of the thick line part 73b is longer than the length of the thin line part 73a, compared with the photovoltaic cell 300 which concerns on 3rd Embodiment, it is further thick line part 73b.
  • the bonding area between the TAB wire 4 and the substrate 2 can be further secured, and the mechanical connection strength of the TAB wire 4 can be further secured.
  • FIG. 9 is a plan view showing the back surface of the solar battery cell according to the sixth embodiment of the present invention.
  • the solar cell 600 according to the sixth embodiment is different from the solar cell 300 according to the third embodiment (see FIG. 6) in that the length of the thin line portion 73 a and the length of the thick line portion 73 b are different.
  • the back surface alignment mark 76 instead of the back surface alignment mark 73, the back surface alignment mark 76 whose length of the thick line portion 73b is shorter than that of the thin line portion 73a is provided.
  • FIG. 10 is a plan view showing the back surface of the solar battery cell according to the seventh embodiment of the present invention.
  • the solar cell 700 according to the seventh embodiment is different from the solar cell 100 according to the first embodiment (see FIG. 2) in that instead of the linear back surface alignment mark 71, a notch This is that a back-side alignment mark 77 is provided.
  • the back surface alignment marks 77 and 77 have a triangular cutout at the end of the substrate 2 on the extension of the TAB line 4 to be connected.
  • the cutout shape may be a rectangular shape or a semicircular shape. In short, it may be a notch shape in which the substrate 2 is exposed.
  • an exposed portion where the substrate 2 is exposed is formed on the back surface 22 corresponding to the connection position of the TAB line 4 on the light receiving surface 21, and the exposed portion is the TAB line 4 on the back surface 22.
  • the back surface alignment mark 77 only needs to have a notch shape at the end of the substrate 2 on the extended line of the TAB line 4 to be connected, and according to the first to sixth embodiments. Compared with the back surface alignment marks 71 to 76 of the solar battery cells 100 to 600, dimensional management and the like are facilitated. Therefore, when the back electrode 7 is formed, a portion to be the back alignment mark 77 can be easily set, and the back electrode 7 can be easily formed.
  • the solar cell module formed by the solar cells 700 a plurality of solar cells 700 are arranged, and the finger electrodes 3 of one adjacent solar cell 700 and the back electrode 7 of the other solar cell 700 are provided.
  • the TAB wire 4 is connected via the conductive adhesive film 5 along the light receiving surface alignment mark 6 and the back surface alignment mark 77.
  • the TAB line 4 is accurately connected to the planned position, it is possible to prevent the rows of the solar cells 700 from meandering. Thereby, when manufacturing a solar cell module, it can suppress that a residual stress generate
  • the finger electrode 3 and the TAB line 4 are connected via the conductive adhesive film 5, but a bus bar electrode made of Ag or the like is provided at a position where the TAB line 4 of the light receiving surface 21 is connected.
  • the finger electrode 3 and the TAB line 4 may be electrically connected by providing the bus bar electrode and the TAB line 4 with solder.
  • the film-like conductive adhesive film 5 is used as the conductive adhesive, but a liquid conductive adhesive may be applied.
  • the photoelectric characteristics of the entire solar cell module May be affected by the influence of solar cells having inferior photoelectric characteristics.
  • the solar cell module measures in advance the photoelectric characteristics of each solar cell constituting the solar cell module, and the solar cell has the same photoelectric characteristics.
  • the cells are connected to each other.
  • FIG. 11 is a schematic view showing a conventional measuring apparatus
  • FIG. 12 is a schematic view showing a probe of the measuring apparatus of FIG.
  • a conventional measuring apparatus 10A for measuring photoelectric characteristics of a solar battery cell includes a surface electrode 11 and a pair of probes 12A and 12A.
  • the surface electrode 11 has, for example, a substantially square plate shape, and is made of, for example, brass.
  • the solar battery cell is placed so that the rear electrode of the solar battery cell and the surface electrode 11 are in contact with each other.
  • the probe 12 ⁇ / b> A has a long shape, and the pair of probes 12 ⁇ / b> A and 12 ⁇ / b> A are spaced apart so as to be parallel to each other above the surface electrode 11.
  • the probe 12A includes a bar 13, a voltage probe pin 14, a plurality of current probe pins 15, and bar support members 16 and 16.
  • the bar 13 is a long member, and is formed of, for example, copper.
  • the voltage probe pin 14 is for measuring photoelectric characteristics such as voltage characteristics, and is attached to a substantially central portion of the bar 13 in the longitudinal direction.
  • the voltage probe pin 14 is attached to the bar 13 via an insulating member so as to be electrically insulated from the bar 13, thereby being insulated from the current probe pin 15.
  • the tip of the voltage probe pin 14 is a circular contact portion 14A.
  • the current probe pins 15 are for measuring photoelectric characteristics such as current characteristics, and the plurality of current probe pins 15 are symmetrical along the longitudinal direction of the bar 13 around the voltage probe pins 14, and , Are attached to the bar 13 so as to be spaced apart in a substantially straight line.
  • the plurality of current probe pins 15 are attached to the bar 13 so as to be electrically connected to the bar 13.
  • the tip of the current probe pin 15 is a circular contact portion 15A.
  • the bar support member 16 is a member for supporting the bar 13, and a pair of bar support members 16 and 16 are attached to both ends of the bar 13.
  • the probe 12A is provided on a base or the like (not shown) to which the surface electrode 11 is attached via the bar support members 16 and 16 so that the contact portion 14A and the contact portion 15A face the surface electrode 11. (See FIG. 11).
  • the bar support member 16 is provided with a drive mechanism (not shown) for driving the bar 13 in the vertical direction, whereby the solar cell placed on the upper surface of the surface electrode 11 is connected to the contact portion 14A. And the contact portion 15A can be pressed.
  • the bar support member 16 is provided with an adjustment mechanism (not shown) for horizontally adjusting the position of the bar 13 in the short direction.
  • a conventional solar cell having a bus bar electrode is placed on the upper surface of the surface electrode 11 so that the bus bar electrode and the probe 12A are parallel to each other.
  • the horizontal position of the bar 13 is adjusted so as to face each other.
  • the bar 13 is moved downward, the bus bar electrode is pressed by the contact portion 14A and the contact portion 15A, and the solar cell is irradiated with simulated sunlight, whereby the voltage characteristics and current of the solar cell are irradiated. It is possible to measure the characteristics.
  • the solar cell 100, 200, 300, 400, 500, 600, 700 of this embodiment is not provided with a bus bar electrode, and the light receiving surface alignment mark 6 has a broken line shape (
  • the plurality of finger electrodes 3 are not electrically connected to each other. For this reason, when the electrical characteristics of the solar cells 100 to 700 are to be measured by a conventional measuring apparatus, the distance between the finger electrodes 3 and the distance between the current probe pins 15 are aligned, and each finger electrode 3 has a current. It is necessary to press the probe pin 15 for use.
  • FIG. 13 is a schematic diagram showing a solar cell measurement device according to the present invention
  • FIG. 14 is a schematic diagram showing a probe of the measurement device of FIG.
  • the configuration around the current probe pin 15 is different from the conventional measuring apparatus 10A.
  • the plurality of current probe pins 15 are arranged symmetrically along the longitudinal direction of the bar 13 around the voltage probe pin 14 and densely arranged in a staggered manner. 13, the contact portion 14 ⁇ / b> B at the tip of the voltage probe pin 14 and the contact portion 15 ⁇ / b> A of the current probe pin 15 are connected to each other by a plate electrode 17.
  • the contact portion 14B of the voltage probe pin 14 has a smaller diameter than the contact portion 14A of the conventional measurement apparatus 10A.
  • the plate electrode 17 is a long plate-like member, and is formed of, for example, a solder-plated copper wire that is the same material as the TAB wire.
  • the solar battery cell 100 is placed on the upper surface of the surface electrode 11 so that the finger electrode 3 and the probe 12B are substantially perpendicular (see FIG. 11). Then, by moving the bar 13 downward, pressing all the finger electrodes 3 with the plate electrode 17 and irradiating the light receiving surface of the solar battery cell 100 with simulated sunlight, voltage characteristics and current characteristics of the solar battery cell are obtained. Can be measured at once.
  • the plate electrode 17 is attached across the contact portion 14B of the voltage probe pin 14 and the contact portion 15A of the current probe pin 15, Even in the solar cells 100 to 700 in which the bus bar electrode is not provided and the plurality of finger electrodes 3 are not connected to each other, the photoelectric characteristics can be measured at a time.
  • the solar cell measuring apparatus 10 ⁇ / b> B since the current probe pins 15 are arranged in the nectar in the longitudinal direction of the bar 13, the solar cells can be uniformly pressed by the plate electrode 17. It is possible and can measure a photoelectric characteristic satisfactorily.
  • the shapes of the contact portion 14B and the contact portion 15A are not necessarily circular, and may be, for example, a needle shape.
  • the material of the plate electrode 17 is not necessarily the same material as that of the TAB wire, and may be other metals.
  • Table 1 shows a result of measuring photoelectric characteristics of a conventional solar battery cell having a bus bar electrode by a conventional measuring device, and a measuring device (new measuring device) having a plate electrode without a bus bar electrode. The result of having measured the photoelectric characteristic of the photovoltaic cell in which the finger electrode of this is not mutually connected is shown.
  • both the photovoltaic cells used for the measurement differ only in whether it has a bus-bar electrode, and other points are the same.
  • the back surface alignment mark is an exposed portion where the substrate 2 is exposed, but may be a portion where the back surface electrode 7 is omitted to the extent that the substrate 2 is not exposed.
  • the back surface alignment mark may be a groove or the like provided in the back surface electrode 7. That is, the back surface alignment mark may be an abbreviated portion (including both exposed portions and grooves) in which the back surface electrode 7 is omitted.
  • the conductive adhesive film 5 may be relatively difficult to adhere to the back surface 22 of the substrate 2.
  • at least one (part) of the back surface alignment mark may be filled with an auxiliary material to which the conductive adhesive film 5 is relatively easy to adhere. That is, at least one of the back surface alignment marks is filled with an auxiliary material, and the adhesive force of the conductive adhesive film 5 to the auxiliary material is larger than the adhesive force of the conductive adhesive film 5 to the back surface 22 of the substrate 2. Also good.
  • the back surface alignment mark does not necessarily need to be completely filled with the auxiliary material, and may be filled with the auxiliary material to the extent that it is covered.
  • an auxiliary material that satisfies the back surface alignment mark for example, Ag, Cu, Au, ITO (indium tin oxide), IZO (indium zinc oxide), or the like can be used.
  • the solar cell module according to the present invention can be manufactured according to the following method. That is, a plurality of finger electrodes arranged on the light receiving surface, an alignment mark provided on the light receiving surface indicating a position where the second TAB line is connected to the finger electrodes through the conductive adhesive, and the back surface of the substrate And a back surface electrode connected to a plurality of finger electrodes of adjacent cells by a first TAB line through a conductive adhesive, and a part of the back surface of the substrate is 2 is exposed at a position corresponding to the position on the light receiving surface to which the TAB line is connected, and the exposed portion constitutes an alignment mark on the back surface indicating the position where the first TAB line is bonded.
  • the first TAB line is connected to the back electrode via a conductive adhesive at the position indicated by the back surface alignment mark.
  • the solar cell module according to the present invention can also be manufactured according to the following method. That is, a light provided with a plurality of finger electrodes arranged on the light receiving surface and a back surface electrode that covers the back surface of the substrate and is connected to the plurality of finger electrodes of the adjacent cell by the first TAB line via the conductive adhesive.
  • a photovoltaic substrate is provided, and the back electrode has an abbreviated portion arranged to define at least one alignment mark indicating a position to which the first TAB line is adhered, and the at least one alignment mark is the first alignment mark.
  • the first TAB line has a width smaller than the width of one TAB line, and the first TAB line is connected to the back electrode via a conductive adhesive at a position indicated by the back surface alignment mark.

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PCT/JP2012/063895 2011-05-31 2012-05-30 太陽電池セル、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 WO2012165464A1 (ja)

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JP2014232864A (ja) * 2013-04-30 2014-12-11 日立化成株式会社 太陽電池モジュールの製造方法
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JPWO2012121348A1 (ja) 2011-03-08 2014-07-17 日立化成株式会社 太陽電池セル、太陽電池モジュール、太陽電池セルの製造方法及び太陽電池モジュールの製造方法
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TW201304163A (zh) 2013-01-16
CN202651127U (zh) 2013-01-02
CN102810530B (zh) 2017-03-01
JPWO2012165464A1 (ja) 2015-02-23
CN102810530A (zh) 2012-12-05
CN202651147U (zh) 2013-01-02

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