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WO2013020590A1 - Cellule solaire rectangulaire et agencement correspondant de cellules solaires - Google Patents

Cellule solaire rectangulaire et agencement correspondant de cellules solaires Download PDF

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Publication number
WO2013020590A1
WO2013020590A1 PCT/EP2011/063721 EP2011063721W WO2013020590A1 WO 2013020590 A1 WO2013020590 A1 WO 2013020590A1 EP 2011063721 W EP2011063721 W EP 2011063721W WO 2013020590 A1 WO2013020590 A1 WO 2013020590A1
Authority
WO
WIPO (PCT)
Prior art keywords
solar cell
bus
solar
adjacent
buses
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/EP2011/063721
Other languages
German (de)
English (en)
Inventor
Ingram Eusch
Johann SUMMHAMMER
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
KIOTO Photovoltaics GmbH
Original Assignee
KIOTO Photovoltaics GmbH
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 KIOTO Photovoltaics GmbH filed Critical KIOTO Photovoltaics GmbH
Priority to PCT/EP2011/063721 priority Critical patent/WO2013020590A1/fr
Publication of WO2013020590A1 publication Critical patent/WO2013020590A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F77/00—Constructional details of devices covered by this subclass
    • H10F77/20—Electrodes
    • H10F77/206—Electrodes for devices having potential barriers
    • H10F77/211—Electrodes for devices having potential barriers for photovoltaic cells
    • H10F77/215—Geometries of grid contacts
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10F—INORGANIC SEMICONDUCTOR DEVICES SENSITIVE TO INFRARED RADIATION, LIGHT, ELECTROMAGNETIC RADIATION OF SHORTER WAVELENGTH OR CORPUSCULAR RADIATION
    • H10F19/00—Integrated devices, or assemblies of multiple devices, comprising at least one photovoltaic cell covered by group H10F10/00, e.g. photovoltaic modules
    • H10F19/90—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers
    • H10F19/902—Structures for connecting between photovoltaic cells, e.g. interconnections or insulating spacers for series or parallel connection of photovoltaic cells
    • 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 invention relates to a rectangular solar cell and associated solar cell arrangement.
  • Crystalline silicon solar cells are disc-shaped semiconductor bodies in which electrical DC voltage is generated by the incidence of light. In order to achieve a dense coverage of larger areas, the discs are usually square or rectangular. In some types of solar cells, the corners of the discs are rounded due to production. Usual sizes of the discs are 100 x 100 mm 2 to about 200 x 200 mm 2 . The thickness is usually between 150 and 350 ⁇ , In the vast majority of silicon solar cells produced today represents the light-facing side of the disc one polarity, and the side facing away from the light the other polarity.
  • Mitteis metallic conductor in ohmic Contact with these surfaces, electrical current is dissipated to the outside.
  • These metallic conductors are on the side facing away from the light - the back - designed either as a full-surface coverage or as a dense mesh. As a result, the ohmic losses are kept low.
  • the metallic conductors are usually applied in the form of thin parallel lines, which on the one hand to ensure low shading of the active semiconductor body, and on the other hand also low ohmic losses in the current dissipation.
  • These thin lines are called fingers. They collect the current from the semiconductor body and lead it to one or more thick lines. These thick lines are called buses.
  • the buses collect all the electricity generated by the solar cell and direct it to an edge of the disc where it is tapped. For a given shape and number of buses, the arrangement and number of fingers are obtained according to known physical principles from an optimization calculation, the aim of which is to obtain the maximum electrical power from the solar cell for a given incident light output.
  • a suitable number of solar lines are connected in series.
  • the solar cells are first connected to linear chains, so-called strings, and then several strings are placed side by side and also connected in series, but sometimes also in parallel to each other.
  • Such a connection is called a module.
  • encapsulation e.g. Embedding the solar cells, which have already been assembled into modules, into clear plastic films and then optically sealing them onto a glass plate so that they protect the solar cells from the front.
  • metallic wires which are frequently shaped as flat bands, are electrically conductively fixed to the buses of a solar cell and led to the back of an immediately adjacent second solar cell, where they are likewise fastened in an electrically conductive manner.
  • attachment methods are, for example Soldering, ultrasonic welding, gluing with electrically conductive adhesive, and mechanical pressing in use.
  • the buses of the second solar cell are in turn electrically conductively connected to the back of a third solar cell adjacent to this solar cell, etc.
  • Figure 1 The most common type of this series connection is shown in Figure 1.
  • the object of the present invention while maintaining the semiconductor material and the production technique of the solar cell itself, as far as possible to minimize this loss of power of a solar cell string, and thus better use the available, irradiated by the sun surface.
  • the invention relates to a rectangular solar cell made of crystalline material having a front side facing the light in use and having a first polarity and a rear side facing away from the light when used with a second polarity, having the following features:
  • Solar cell at least one bus to collect and forward on the
  • Solar cell at least one bus to collect and forward on the
  • At least one bus is designed as a linearly extending flat conductor. It can also be all buses designed.
  • This solar cell can be formed with a plurality of fingers arranged parallel to and spaced from one another on the front side, which extend perpendicular to the at least one bus on the front side of the solar cell and are electrically connected thereto.
  • the back of the solar cell is designed, for example, as a full-surface or network designed as a metallic conductor and electrically connected to the at least one bus on the back of the solar cell.
  • one feature of the invention is to form the solar cell rectangularly and with short electrical paths in order to optimize the efficiency. Accordingly, the length to width ratio of the solar cell should preferably be> 3, better:> 4 or> 6.
  • the energetically effective area of the solar cell is further optimized if the buses run without distance to the respective longitudinal edge of the solar cell, ie directly to the longitudinal edge of the solar cell connect (while the associated fingers perpendicular thereto or parallel to the broad sides of the solar cell in the respective bus open out).
  • the solar cell according to the invention may have a length £ 150mm, for example 56mm or> 200mm and a thickness 1 300pm, for example ⁇ 300 ⁇ .
  • the solar cells are arranged side by side along their respective longitudinal edges, and the respective at least one bus on the front side of a solar cell is electrically connected to the respective at least one bus on the rear side of the adjacent solar cell.
  • the busses of the front and rear side of adjacent solar cells can lie on top of one another, that is, an overlapping area is created, so that a series of solar cells arranged next to one another (a string) runs in an imbricated manner to each other, as shown in FIG.
  • this overlapping area is minimized and preferably limited to the width of the corresponding buses in order to keep the soiarnt unusable area as small as possible.
  • the height (thickness) of the string at the overlap areas increases approximately to 2 times the thickness of the single solar cell.
  • this does not interfere with the small thickness of each solar cell, especially as the solar cells are subsequently assembled (laminated) between glass and / or plastic layers.
  • the busses of front and back of adjacent solar cells can be directly or indirectly electrically connected; directly, for example by direct soldering or indirectly, for example via at least one connector to which the buses are glued, soldered or otherwise connected.
  • An alternative arrangement provides for laying the buses of front and rear adjacent solar cells side by side and to connect electrically via a connector. This arrangement avoids thickened zones in the terminal area of adjacent solar cells.
  • the connection between the connector (adapter) and the buses can be made as shown above.
  • the connector between adjacent buses of front and back adjacent solar cells may be stepped to compensate for the (very small) height difference between the front of a solar cell and the back of an adjacent solar cell.
  • An embodiment provides that the respective at least one bus on the front side of a solar cell with the respective at least one bus on the Rear side of the adjacent solar cell is soldered via at least one connector in the form of an electrically conductive strip.
  • a conventional square solar cell can be divided into four equal, smaller solar cells by division along the lines of symmetry (5).
  • These new solar cells can now be connected in series along their long sides. Since the electrical path lengths shrink during the transport of electricity from one solar cell to the next to a fraction, the electrical losses decrease.
  • the series connection can be shingled, so that the proportion of the total area of the string, which is shaded by buses, as well as the unused by intervals between the cells area fraction completely disappears.
  • FIG. 2 outlines the inventive principle of the series connection of the solar cells on the basis of a view of the front side of four solar cells.
  • solderable metal bus for collecting the current from the fingers
  • FIG. 3 outlines the inventive principle of this series connection on the basis of a view of the back side of four solar cells, viewed from below.
  • the losses in the fingers (7) of the solar cell according to the invention are the same as in the fingers (2) of the conventional square solar cells, since they have the same length and nature. Also, the losses due to the contact resistance between the bus (8) and the connector (9) can be set as the same as those between the bus (3) and the conductor strip (4) in the conventional square solar cells because of the same current density. This is ensured when the bus (8) has half the width of the bus (3). The unused area through the bus (8) can be completely eliminated if the connector (9) is located on the solar cell so that it does not cover more than the bus (8), and the solar cell above it also no more than the bus ( 8) covers.
  • the connector (9) has the task of conducting the current from the front side of the solar cell A (10) to the back of the solar cell B (11) and thereby causing the lowest possible ohmic losses.
  • the connector has the task of conducting the current from the front side of the solar cell A (10) to the back of the solar cell B (11) and thereby causing the lowest possible ohmic losses.
  • a connector composed of a plurality of unconnected portions of a metallic strip to reduce stress due to differential thermal expansion of the solar cell and the connector
  • a good conducting metal e.g. Copper
  • connection technology for solar cells as mentioned under 1, wherein a connector (9) is placed in the form of a solder-coated Metaflbandes on the bus (8) of a solar cell A (10), wherein the metal strip may consist of several sections, so the bus (8) is at least partially covered and a solar cell B (1 1) is placed on this connector so that it contacts the back side bus (12) of the solar cell surface and then solar cell A (10), connector (9) and solar cell B (1 1) firmly pressed together and briefly heated, so that a solid solder joint is formed,
  • connection technology for solar cells as under 1. called, are coated with solder coated straight wire pieces on the bus (8) of the solar cell A (10), that they are approximately at right angles to this, and thereon one
  • Solar cell B (1 1) is placed so that the wire pieces their back bus (12) well then contact solar cell A (10), wire pieces and solar cell B (1 1) firmly together and heat briefly, so that a firm solder joint is formed,
  • connection technology for solar cells as mentioned under 1., wherein a connector (9) in the form of provided with both sides roughened surface metal band on the bus (8) of the solar cell A (10) is placed, wherein the metal strip may consist of several sections such that the bus (8) is at least partially covered and a solar cell B (1 1) is placed on this connector such that it contacts the rear side bus (12) of the solar cell B (1 1) and then solar cell A (10) , Connector (9) and solar cell B (1 1) are pressed firmly against each other, so that the protruding parts of the roughened surfaces of the connector (9) into both the bus (8) of the solar cell A (10) and in the back side bus (12 ) penetrate the solar cell B (1 1) or at least establish firm mechanical and electrical contact.

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  • Photovoltaic Devices (AREA)

Abstract

L'invention concerne le format d'une cellule solaire et les éléments de liaison entre des cellules solaires.
PCT/EP2011/063721 2011-08-09 2011-08-09 Cellule solaire rectangulaire et agencement correspondant de cellules solaires Ceased WO2013020590A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/063721 WO2013020590A1 (fr) 2011-08-09 2011-08-09 Cellule solaire rectangulaire et agencement correspondant de cellules solaires

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/EP2011/063721 WO2013020590A1 (fr) 2011-08-09 2011-08-09 Cellule solaire rectangulaire et agencement correspondant de cellules solaires

Publications (1)

Publication Number Publication Date
WO2013020590A1 true WO2013020590A1 (fr) 2013-02-14

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Family Applications (1)

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Country Status (1)

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WO (1) WO2013020590A1 (fr)

Cited By (47)

* Cited by examiner, † Cited by third party
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US9281436B2 (en) 2012-12-28 2016-03-08 Solarcity Corporation Radio-frequency sputtering system with rotary target for fabricating solar cells
US9356184B2 (en) 2014-05-27 2016-05-31 Sunpower Corporation Shingled solar cell module
US9412884B2 (en) 2013-01-11 2016-08-09 Solarcity Corporation Module fabrication of solar cells with low resistivity electrodes
US9461189B2 (en) 2012-10-04 2016-10-04 Solarcity Corporation Photovoltaic devices with electroplated metal grids
US9496427B2 (en) 2013-01-11 2016-11-15 Solarcity Corporation Module fabrication of solar cells with low resistivity electrodes
US9496429B1 (en) 2015-12-30 2016-11-15 Solarcity Corporation System and method for tin plating metal electrodes
US9590132B2 (en) 2014-12-05 2017-03-07 Solarcity Corporation Systems and methods for cascading photovoltaic structures
US9624595B2 (en) 2013-05-24 2017-04-18 Solarcity Corporation Electroplating apparatus with improved throughput
US9685579B2 (en) 2014-12-05 2017-06-20 Solarcity Corporation Photovoltaic structure cleaving system
WO2017117136A1 (fr) * 2015-12-30 2017-07-06 Sunedison, Inc. Procédé d'interconnexion avancée pour chaînes et modules photovoltaïques
US9761744B2 (en) 2015-10-22 2017-09-12 Tesla, Inc. System and method for manufacturing photovoltaic structures with a metal seed layer
US9773928B2 (en) 2010-09-10 2017-09-26 Tesla, Inc. Solar cell with electroplated metal grid
US9793421B2 (en) 2014-12-05 2017-10-17 Solarcity Corporation Systems, methods and apparatus for precision automation of manufacturing solar panels
US9800053B2 (en) 2010-10-08 2017-10-24 Tesla, Inc. Solar panels with integrated cell-level MPPT devices
US9842956B2 (en) 2015-12-21 2017-12-12 Tesla, Inc. System and method for mass-production of high-efficiency photovoltaic structures
US9865754B2 (en) 2012-10-10 2018-01-09 Tesla, Inc. Hole collectors for silicon photovoltaic cells
US9887306B2 (en) 2011-06-02 2018-02-06 Tesla, Inc. Tunneling-junction solar cell with copper grid for concentrated photovoltaic application
US9947820B2 (en) 2014-05-27 2018-04-17 Sunpower Corporation Shingled solar cell panel employing hidden taps
US9947822B2 (en) 2015-02-02 2018-04-17 Tesla, Inc. Bifacial photovoltaic module using heterojunction solar cells
US9991412B2 (en) 2014-12-05 2018-06-05 Solarcity Corporation Systems for precision application of conductive adhesive paste on photovoltaic structures
US10043937B2 (en) 2014-12-05 2018-08-07 Solarcity Corporation Systems and method for precision automated placement of backsheet on PV modules
US10056522B2 (en) 2014-12-05 2018-08-21 Solarcity Corporation System and apparatus for precision automation of tab attachment for fabrications of solar panels
US10074755B2 (en) 2013-01-11 2018-09-11 Tesla, Inc. High efficiency solar panel
US10084107B2 (en) 2010-06-09 2018-09-25 Tesla, Inc. Transparent conducting oxide for photovoltaic devices
US10084104B2 (en) 2015-08-18 2018-09-25 Sunpower Corporation Solar panel
US10084099B2 (en) 2009-11-12 2018-09-25 Tesla, Inc. Aluminum grid as backside conductor on epitaxial silicon thin film solar cells
US10090430B2 (en) 2014-05-27 2018-10-02 Sunpower Corporation System for manufacturing a shingled solar cell module
US10115838B2 (en) 2016-04-19 2018-10-30 Tesla, Inc. Photovoltaic structures with interlocking busbars
KR20180136278A (ko) * 2017-06-14 2018-12-24 엘지전자 주식회사 태양 전지, 태양전지 모듈과 그 제조 방법
US10236406B2 (en) 2014-12-05 2019-03-19 Solarcity Corporation Systems and methods for targeted annealing of photovoltaic structures
EP3312889A4 (fr) * 2016-02-18 2019-03-20 GCL System Integration Technology Co., Ltd. Ensemble de cellules solaires et procédé de préparation associé
US10309012B2 (en) 2014-07-03 2019-06-04 Tesla, Inc. Wafer carrier for reducing contamination from carbon particles and outgassing
US10672919B2 (en) 2017-09-19 2020-06-02 Tesla, Inc. Moisture-resistant solar cells for solar roof tiles
US10673379B2 (en) 2016-06-08 2020-06-02 Sunpower Corporation Systems and methods for reworking shingled solar cell modules
USD896747S1 (en) 2014-10-15 2020-09-22 Sunpower Corporation Solar panel
US10861999B2 (en) 2015-04-21 2020-12-08 Sunpower Corporation Shingled solar cell module comprising hidden tap interconnects
USD913210S1 (en) 2014-10-15 2021-03-16 Sunpower Corporation Solar panel
USD933585S1 (en) 2014-10-15 2021-10-19 Sunpower Corporation Solar panel
USD933584S1 (en) 2012-11-08 2021-10-19 Sunpower Corporation Solar panel
US11190128B2 (en) 2018-02-27 2021-11-30 Tesla, Inc. Parallel-connected solar roof tile modules
US11482639B2 (en) 2014-05-27 2022-10-25 Sunpower Corporation Shingled solar cell module
USD977413S1 (en) 2014-10-15 2023-02-07 Sunpower Corporation Solar panel
US11595000B2 (en) 2012-11-08 2023-02-28 Maxeon Solar Pte. Ltd. High efficiency configuration for solar cell string
USD999723S1 (en) 2014-10-15 2023-09-26 Sunpower Corporation Solar panel
US11942561B2 (en) 2014-05-27 2024-03-26 Maxeon Solar Pte. Ltd. Shingled solar cell module
DE102022124476A1 (de) * 2022-09-23 2024-03-28 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung eingetragener Verein Solarzellenmodul und Verfahren zur Herstellung eines Solarzellenmoduls
US11978818B2 (en) 2017-09-07 2024-05-07 Longi Solar Technology (Taizhou) Co., Ltd. Solder strip applied to shingled solar cell module

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US10084107B2 (en) 2010-06-09 2018-09-25 Tesla, Inc. Transparent conducting oxide for photovoltaic devices
US9773928B2 (en) 2010-09-10 2017-09-26 Tesla, Inc. Solar cell with electroplated metal grid
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US9461189B2 (en) 2012-10-04 2016-10-04 Solarcity Corporation Photovoltaic devices with electroplated metal grids
US9502590B2 (en) 2012-10-04 2016-11-22 Solarcity Corporation Photovoltaic devices with electroplated metal grids
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USD933584S1 (en) 2012-11-08 2021-10-19 Sunpower Corporation Solar panel
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US10164127B2 (en) 2013-01-11 2018-12-25 Tesla, Inc. Module fabrication of solar cells with low resistivity electrodes
US9496427B2 (en) 2013-01-11 2016-11-15 Solarcity Corporation Module fabrication of solar cells with low resistivity electrodes
US10115839B2 (en) 2013-01-11 2018-10-30 Tesla, Inc. Module fabrication of solar cells with low resistivity electrodes
US9624595B2 (en) 2013-05-24 2017-04-18 Solarcity Corporation Electroplating apparatus with improved throughput
US9882077B2 (en) 2014-05-27 2018-01-30 Sunpower Corporation Shingled solar cell module
US9397252B2 (en) 2014-05-27 2016-07-19 Sunpower Corporation Shingled solar cell module
US11942561B2 (en) 2014-05-27 2024-03-26 Maxeon Solar Pte. Ltd. Shingled solar cell module
US11038072B2 (en) 2014-05-27 2021-06-15 Sunpower Corporation Shingled solar cell module
US9876132B2 (en) 2014-05-27 2018-01-23 Sunpower Corporation Shingled solar cell module
US9780253B2 (en) 2014-05-27 2017-10-03 Sunpower Corporation Shingled solar cell module
US9484484B2 (en) 2014-05-27 2016-11-01 Sunpower Corporation Shingled solar cell module
US11949026B2 (en) 2014-05-27 2024-04-02 Maxeon Solar Pte. Ltd. Shingled solar cell module
US9947820B2 (en) 2014-05-27 2018-04-17 Sunpower Corporation Shingled solar cell panel employing hidden taps
US10090430B2 (en) 2014-05-27 2018-10-02 Sunpower Corporation System for manufacturing a shingled solar cell module
US11482639B2 (en) 2014-05-27 2022-10-25 Sunpower Corporation Shingled solar cell module
US9356184B2 (en) 2014-05-27 2016-05-31 Sunpower Corporation Shingled solar cell module
US9401451B2 (en) 2014-05-27 2016-07-26 Sunpower Corporation Shingled solar cell module
US10309012B2 (en) 2014-07-03 2019-06-04 Tesla, Inc. Wafer carrier for reducing contamination from carbon particles and outgassing
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US10056522B2 (en) 2014-12-05 2018-08-21 Solarcity Corporation System and apparatus for precision automation of tab attachment for fabrications of solar panels
US10236406B2 (en) 2014-12-05 2019-03-19 Solarcity Corporation Systems and methods for targeted annealing of photovoltaic structures
US9590132B2 (en) 2014-12-05 2017-03-07 Solarcity Corporation Systems and methods for cascading photovoltaic structures
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