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WO2006137746A1 - Rubans de relaxation des tensions - Google Patents

Rubans de relaxation des tensions Download PDF

Info

Publication number
WO2006137746A1
WO2006137746A1 PCT/NO2006/000240 NO2006000240W WO2006137746A1 WO 2006137746 A1 WO2006137746 A1 WO 2006137746A1 NO 2006000240 W NO2006000240 W NO 2006000240W WO 2006137746 A1 WO2006137746 A1 WO 2006137746A1
Authority
WO
WIPO (PCT)
Prior art keywords
soldering
ribbon
solar cell
electrical conductor
length
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/NO2006/000240
Other languages
English (en)
Inventor
Erik Sauar
Daniele Margadonna
Tim Lommasson
Helge Cato Aamodt
Ingmar ÅSBERG
Andreas Bentzen
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.)
Renewable Energy Corp ASA
Original Assignee
Renewable Energy Corp ASA
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 Renewable Energy Corp ASA filed Critical Renewable Energy Corp ASA
Publication of WO2006137746A1 publication Critical patent/WO2006137746A1/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
    • 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
    • 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 method for electrical connection of solar cells and solar cells equipped with the electrical connection according to the invention.
  • the current practice to assembly solar cells in photovoltaic modules makes use of copper ribbons with various coatings (tin, silver, lead etc) for the electrical connection of each solar cell to the next.
  • the ribbon is frequently first soldered on the front of each cell along the soldering track (2 or more tracks on each cell).
  • the ribbon is then soldered on the back of the next cell in order to build a string of series connected cells.
  • ribbons are soldered simultaneously on the front and on the back.
  • ribbons are soldered only at the back.
  • An example of typical present connection and assembly of solar panels according to prior art is schematically illustrated in Figures 1 to 4.
  • Fig 1 and 2 illustrate the front side and the rear side of a solar cell 10 according to prior art, and will be described briefly herein.
  • the solar cell 10 is for example of the crystalline silicon type and comprises two soldering tracks 12 on each side.
  • the soldering tracks 12 for example comprise a thin layer of silver printed onto the solar cell surface.
  • Fig. 3 shows how solar cells 10 of the abovementioned type are typically interconnected according to prior art. It shall be noted that the interconnection described herein is primarily referring to the electrical connection between the solar cells, and to a lesser extent the physical connection.
  • the physical assembling of the solar cells to each other and to other parts of the solar panel device is provided by solar cell fastening means (not shown). Such solar cell fastening means are considered known per se for a man skilled in the art and will not be described here.
  • the solar cells are interconnected by means of copper ribbons 14, usually with a coating to improve solderability. In the shown example, a first end of the ribbon 14 is soldered to the front side of a first solar cell and a second end of the ribbon 14 is soldered to the rear side of the adjacent solar cell, as illustrated in fig. 4.
  • soldering methods are today applied to solar cells made on silicon having thickness in the range of 200 - 350 micron and area in the range of 150-250 cm 2 .
  • the conventional mentioned methods cannot be easily applied.
  • the ribbon (typically copper) and silicon wafer are mechanically coupled at the soldering temperature (typically 200 - 400 0 C).
  • the silicon is consequently subjected to mechanical stress since the ribbon (typically copper) is shrinking more than the silicon.
  • the problem becomes more important when the wafer thickness is reduced, and/or when the cell area is increased or when the soldering temperature is increased due to the use of (lead-free) higher temperature solder coatings.
  • the mechanical stress is resulting in an increased occurrence of broken cells during soldering and cooling, regardless of whether the soldering is made manually or automatically by a machine, and such breakage is very costly.
  • the main objective of the present invention is to provide a method for electrical connection of solar cells that solves the abovementioned problems.
  • a further objective of the invention is to reduce the stress effect in the cell caused by the electrical connection, and in this way make it possible to use solar cells with increased surface area, decreased thickness and/or lead-free soldering without increasing the electrical losses and/or the cost of the ribbon.
  • the present invention is based on the realisation that mechanical stress due to use of ribbon(s) with different thermal expansion than the solar wafer, may be solved by equipping the ribbon(s) with one or more deformable stress relieving sections formed by only soldering the ribbon(s) onto the solar cell in two or more interspaced sections on the solar cell surface, and thus forming one or more intersections where the ribbon(s) is/are not fastened to the solar cell surface. These one or more intersections will then be free to bend and thus relive mechanical stress induced by differences in thermal expansion of solar cell and ribbon(s).
  • a further deformability and thus stress relieving capacity will be obtained by allowing the length of the ribbon(s) in the intersection zones to be larger than the distance along the solar cell surface between the soldering sections such that the ribbon(s) will be more or less bent above these intersections.
  • the intersections may be applied on one or both sides of the solar cell.
  • the characteristic length of the soldering section may vary from a point-like soldering spot to elongated soldering areas extending almost from edge-to-edge of the solar cell.
  • soldering sections for fastening the ribbon(s) will not only solve the problem with induced mechanical stress due to difference in thermal contraction after the soldering process which operates at 200 — 400 0 C, but will also prolong the service time of solar panels since bending forces induced by the thermal variations will be more or less eliminated.
  • the difference in day and night temperatures in solar panels might be in the order of 50 - 60 °C, which will induce periodic stresses in conventional cells which may lead to breakages, unacceptable bending inside panels etc.
  • ribbon as used herein includes any conceivable electric conducting structure connected to the contacts of solar cells in order to interconnect solar cells into modules. Ribbons are often made of copper coated with tin, lead, silver etc., but the invention may employ any electric conducting material enabling charge carriers to enter an external circuit.
  • Fig. 1 shows a front view of a solar cell with soldering tracks according to prior art
  • Fig. 2 shows a rear view of a solar cell with soldering tracks according to prior art
  • Fig. 3 illustrates the interconnection of the solar cells in fig. 1 and 2
  • Fig. 4 shows a cross sectional view of some of the interconnected solar cells in fig. 3;
  • Fig. 5 and 6 shows a front view and a rear view of a solar cell according to an example embodiment of the invention, respectively;
  • Fig. 7 illustrates a moulding device for the corrugated ribbon according to an example embodiment of the invention
  • Fig 8 illustrates the use of the corrugated ribbon as made by the example device illustrated in Figure 7;
  • Fig. 9 illustrates how a corrugated ribbon can be fastened to a solar cell
  • Fig. 10 illustrates a ribbon which is corrugated in the same plane as the cell itself
  • Fig. 11 a - e illustrates a second embodiment of the invention
  • Fig. 12 a - b illustrates a third embodiment of the invention.
  • the first aspect of the invention is related to the use of a corrugated ribbon 24 for electrical connection of the solar cell.
  • Preferred embodiments according to the first aspect of the invention are illustrated in figures 5 — 10.
  • the method according to the first aspect of the invention obtains the stress relieve by applying soldering to the solar cell (20) or onto a soldering area (Br) of a corrugated ribbon (24), and soldering the soldering area (Br) of the corrugated ribbon (24) to the solar cell (20).
  • the solar cell according to the first aspect of the invention is characterised in that the device comprises a corrugated ribbon (24) having at least two interspaced soldering areas (B r ) which are soldered to the solar cell (20), either by applying solder to each soldering area (B r ) of the corrugated ribbon (24) or by applying soldering to corresponding soldering areas (B) of the solar cell (20).
  • the first aspect of the invention is considered to be the best mode of the invention.
  • the front side and the rear side of a solar cell 20 according to a first preferred embodiment of the invention is schematically shown in Figure 5 and 6, respectively.
  • the soldering tracks 22 comprises areas B with length denoted b and an area C with length denoted c. Areas B, C may be adapted to the ribbon according to the invention, which will be described below.
  • soldering occurs only on areas B.
  • soldering may be continuously or only on areas B.
  • the soldering tracks 22 comprise a thin layer of primarily silver printed onto the solar cell surface. In the embodiment shown on the figures, the soldering track 22 is continuously applied to the solar cell on the front side, and on defined regions on the back side.
  • the corrugated ribbon 24 for interconnecting the preferred embodiments of the solar cells 20, is shown in Fig. 7.
  • the corrugated ribbon comprises a coated copper conductor having a thickness in the range 0.1 — 0.3 mm and a width from 1 to 3 mm.
  • the corrugated ribbon 24 is corrugated with a height denoted a r .
  • the corrugated ribbon further comprises periodical bends or angles along its length, where one period or pitch length p r is equal to the length b r of one soldering area B r plus the length of the free path denoted c r , see Figure 7.
  • the soldering areas B r is equal to the length b r times the width of the corrugated ribbon 24.
  • the areas B of the soldering track 22 may be adapted to soldering areas B r of the corrugated ribbon 24, or as shown in Figure 5, may be wider than the soldering areas B r of the ribbon(s).
  • the length c of area C of the soldering track 22 should preferably be adapted to the free length c r of the corrugated ribbon 24.
  • the frequent bends or angles will provide flexibility, since the free length c r of the ribbon is not fastened to any parts of the solar cell or the solar panel device. This flexibility will reduce the stress effect to the cell, since there is some elasticity provided by the bent part of the ribbon. Consequently, the stress accumulated along the soldering track 22 can be substantially reduced if the following is considered.
  • the ratio b r /c r is between 1/10 and 1 A, in a more preferred embodiment the ratio b r /c r is between 1/6 and 1/3.
  • the total length of the ribbon is so much longer than the soldering track that after cooling down from the soldering temperature, both the ribbon and the soldering track are equally long.
  • the ideal additional length of the copper based ribbon at the high temperature is approximately 0.42 millimetres, which is equivalent to 0.27 % of the ribbon's length.
  • the corrugation of the ribbon 24 is obtained by pressing a long and relatively flat ribbon between a first moulding plate 40 comprising spaced teeth 41 and a second moulding plate 42 comprising spaced apertures 43.
  • the length b r and length c r are also indicated in the drawing.
  • ratio b r /c r and the number of soldering points on the printed soldering track will among other factors depend on the electric conductivity of the soldering tracks on the cell. Furthermore, the pitch length p r will depend on the soldering method, where four methods are frequently used today:
  • the chosen design of the corrugated ribbon will vary in different applications, and a person skilled in the art with knowledge of the present disclosure will perform evaluations and computations to achieve the wanted performance for his or her application.
  • the pitch length p r cannot be too short.
  • a hot tip 50 must be placed in contact with the soldering length b r , as illustrated in fig. 9.
  • a lower corrugated ribbon 24 is soldered to the rear side of the solar cell 20 at the same time as an upper corrugated ribbon 24 is soldered to the front side of the solar cell 20 using the hot tip 50.
  • the lower corrugated ribbon is supported by a preheated plate 51 having a temperature below the soldering temperature.
  • the hot tip 50 is having a temperature of ca 200 - 350 °C and both the lower and the upper corrugated ribbon are soldered to the solar cell simultaneously by the hot tip 50.
  • the corrugated ribbon is placed over the soldering tracks and held in contact by pins.
  • the soldering occurs only in the soldering area B, where the metal is in contact with the cell.
  • the abovementioned detailed description is especially provided to illustrate and to describe the preferred embodiments of the invention. However, the description is by no means limiting the invention to the specific embodiments.
  • the soldering track 22 can be discontinuously applied to the solar cell, so that only the areas B on fig. 5 and 6 are coated. Alternatively, the soldering is applied along the soldering areas B r of the corrugated ribbon(s) before fastening the ribbon(s) to the solar cell. The ribbon(s) is/are then connected to the next solar cell or to other parts of the electrical circuit arrangement of the solar panel device. Moreover, it is of course possible to apply more than one soldering track 22 for each polarity on each solar cell.
  • the corrugation described so far is a corrugation created so that the ribbon section c r is not soldered onto the cell, but standing some minimum distance (between zero and a r due to the shrinking during cool-down) away from the cell surface.
  • Another embodiment of the invention can be accommodated by bending the ribbon in the other plane so that when you see the ribbon soldered onto the cell it no longer forms a straight line as can be seen in Fig. 10.
  • This embodiment has the advantage that when mechanical pressure is applied onto the cell surface (as for example in the lamination process of module manufacturing) there will be no additional stress applied to the cell.
  • This arrangement is particularly effective when both negative and positive contacts are placed on the back of the cell.
  • the dimensions and the pattern of the bending are less important. The critical factor is simply to provide at least one bend between each soldering point.
  • both positive and negative contacts are brought to soldering areas on the back side, and there are more soldering tracks or areas on the back side and none on the front.
  • the back side contacting can be achieved in several ways well defined in the literature, for example emitter wrap through or metal wrap-through. In this case, soldering stress induced on the back is not compensated by equivalent stress on the front, and special soldering technique must be used to avoid the occurrence of bended, and possibly thereafter, broken cells.
  • the second aspect of the invention relates to use of a "comb" for creating the deformable interconnection zones of the ribbons.
  • This embodiment of the invention will now be described with reference to Figure 11 a-e.
  • a comb 119 according to the invention comprises a holding structure 120 periodically applied with comb teeth 122 of an inert (not easily solderable) material such as TEFLON ® .
  • the comb 119 is brought in position on each side of the cell 110 (Fig. l ib) by means of a positioning device (not shown), so that the end 124 of the comb teeth 122 are covering the soldering track 112 of the cell (Fig. 1 Ic).
  • a copper ribbon 130 is placed on the soldering track 112 and over the comb teeth 122.
  • the copper ribbon 130 is soldered onto the soldering track 112 by one of the above-mentioned methods. Consequently, the comb teeth 122 of inert material are increasing the "travelling distance" of the ribbon while the silicon distance is non-affected. Finally, the remaining comb teeth 122 of inert material are removed from the cell after the soldering has started and before the cool-down is completed. Since the comb teeth in this way are increasing the length of the ribbons at the highest temperature, this additional length can be "consumed" during the cooling and shrinking of the ribbon.
  • a combined ribbon 219 according to the invention is comprising a copper ribbon 230 periodically applied with tiny spacer ribbons 220 of a soft, slow- or non- reacting, transparent material such as for example TEFLON ® or EVA ® .
  • the combined ribbon 219 is brought in position onto the soldering track 212 of the cell 210 by means of positioning device (not shown).
  • the spacer ribbons 220 can be tape applied to the copper ribbon 230.
  • the combined ribbon 219 can be pre-cut to desired length, or can be kept as a continuous roll of ribbon that is cut in situ before it is positioned.
  • the combined ribbon 219 is soldered onto the soldering track 112 by one of the above-mentioned methods. Consequently, the spacer ribbons 220 of inert material are providing additional travelling distance for the copper ribbon relative to the soldering track 212 on the silicon. During subsequent cooling, the ribbons will hence shrink more than the silicon, and since the applied ribbons on the tape are soft, the ribbons will be allowed to shrink and release stress.
  • the same periodical soldering can be achieved as in the first embodiment. Consequently, the periodic length p r , the soldering length b r and the free length c r occur in the same way in all examples.

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  • Photovoltaic Devices (AREA)

Abstract

La présente invention concerne un procédé de raccordement électrique de cellules solaires en modules et les cellules solaires équipées du raccordement électrique selon l'invention, au moins un conducteur/ruban électrique est soudé au moins à la face arrière des cellules solaires de telle façon que le ou les conducteurs/rubans électriques soient seulement soudés sur la ou les faces arrières de la cellules solaire dans au moins deux zones de soudage (B) espacées, formant une ou des sections d'espace libre de chaque conducteur/ruban électrique s'étendant entre deux zones de soudage adjacentes (B) qui constituent des zones de déformabilité de relaxation des tensions.
PCT/NO2006/000240 2005-06-24 2006-06-23 Rubans de relaxation des tensions Ceased WO2006137746A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US69344305P 2005-06-24 2005-06-24
US60/693,443 2005-06-24

Publications (1)

Publication Number Publication Date
WO2006137746A1 true WO2006137746A1 (fr) 2006-12-28

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PCT/NO2006/000240 Ceased WO2006137746A1 (fr) 2005-06-24 2006-06-23 Rubans de relaxation des tensions

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WO (1) WO2006137746A1 (fr)

Cited By (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2009066711A1 (fr) * 2007-11-22 2009-05-28 Sharp Kabushiki Kaisha Dispositif à semi-conducteurs, procédé de fabrication de ce dispositif et batterie solaire
JP2009164320A (ja) * 2008-01-04 2009-07-23 Sharp Corp 太陽電池および太陽電池モジュール
WO2011064368A1 (fr) * 2009-11-30 2011-06-03 Imec Procédé de fabrication de modules photovoltaïques comprenant des cellules à contact arrière
WO2011160294A1 (fr) * 2010-06-23 2011-12-29 常州天合光能有限公司 Bande de cuivre étamé destinée à réduire les fissures
FR2964251A1 (fr) * 2010-08-30 2012-03-02 Commissariat Energie Atomique Cellule photovoltaique avec un ruban metallique discontinu
EP2466648A1 (fr) * 2010-12-16 2012-06-20 SolarWorld Innovations GmbH Ruban de tabulation, panneau solaire photovoltaïque, procédé de fabrication d'un ruban de tabulation de cellule solaire, machine permettant la fabrication d'un ruban de tabulation de cellule solaire
WO2012123148A3 (fr) * 2011-03-15 2012-11-15 Robert Bosch Gmbh Procédé de fabrication d'un ensemble de cellules solaires
WO2012028537A3 (fr) * 2010-08-30 2012-11-29 Commissariat A L'energie Atomique Et Aux Energies Alternatives Cellule photovoltaïque avec conducteurs discontinus
EP2854181A1 (fr) * 2013-09-27 2015-04-01 Lg Electronics Inc. Cellule solaire
CN105023967A (zh) * 2015-07-24 2015-11-04 苏州宇邦新型材料股份有限公司 梯形焊带及其光伏组件和制备方法
EP2669954A4 (fr) * 2011-01-28 2017-06-21 Panasonic Intellectual Property Management Co., Ltd. Cellule solaire et module de cellule solaire
JP2022000916A (ja) * 2014-05-27 2022-01-04 サンパワー コーポレイション こけら葺き状太陽電池モジュール
CN114871558A (zh) * 2022-05-13 2022-08-09 湖北钛时代新能源有限公司 软连接极板的制备方法
US11942561B2 (en) 2014-05-27 2024-03-26 Maxeon Solar Pte. Ltd. Shingled solar cell module

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US4301322A (en) * 1980-04-03 1981-11-17 Exxon Research & Engineering Co. Solar cell with corrugated bus
JPS59115576A (ja) * 1982-12-22 1984-07-04 Sharp Corp 太陽電池の配線方法
US4542258A (en) * 1982-05-28 1985-09-17 Solarex Corporation Bus bar interconnect for a solar cell
US4652693A (en) * 1985-08-30 1987-03-24 The Standard Oil Company Reformed front contact current collector grid and cell interconnect for a photovoltaic cell module

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4301322A (en) * 1980-04-03 1981-11-17 Exxon Research & Engineering Co. Solar cell with corrugated bus
US4542258A (en) * 1982-05-28 1985-09-17 Solarex Corporation Bus bar interconnect for a solar cell
JPS59115576A (ja) * 1982-12-22 1984-07-04 Sharp Corp 太陽電池の配線方法
US4652693A (en) * 1985-08-30 1987-03-24 The Standard Oil Company Reformed front contact current collector grid and cell interconnect for a photovoltaic cell module

Cited By (22)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2009130118A (ja) * 2007-11-22 2009-06-11 Sharp Corp 半導体装置およびその製造方法ならびに太陽電池
WO2009066711A1 (fr) * 2007-11-22 2009-05-28 Sharp Kabushiki Kaisha Dispositif à semi-conducteurs, procédé de fabrication de ce dispositif et batterie solaire
JP2009164320A (ja) * 2008-01-04 2009-07-23 Sharp Corp 太陽電池および太陽電池モジュール
CN102804405A (zh) * 2009-11-30 2012-11-28 Imec公司 包括背接触电池的光伏模块的制造方法
WO2011064368A1 (fr) * 2009-11-30 2011-06-03 Imec Procédé de fabrication de modules photovoltaïques comprenant des cellules à contact arrière
WO2011160294A1 (fr) * 2010-06-23 2011-12-29 常州天合光能有限公司 Bande de cuivre étamé destinée à réduire les fissures
WO2012028537A3 (fr) * 2010-08-30 2012-11-29 Commissariat A L'energie Atomique Et Aux Energies Alternatives Cellule photovoltaïque avec conducteurs discontinus
US10453975B2 (en) 2010-08-30 2019-10-22 Commissariat à l'Energie Atomique et aux Energies Alternatives Photovoltaic cell having discontinuous conductors
FR2964251A1 (fr) * 2010-08-30 2012-03-02 Commissariat Energie Atomique Cellule photovoltaique avec un ruban metallique discontinu
CN102593223A (zh) * 2010-12-16 2012-07-18 太阳世界创新有限公司 互联带,光伏太阳能电池板,制造互联带的方法和机器
EP2466648A1 (fr) * 2010-12-16 2012-06-20 SolarWorld Innovations GmbH Ruban de tabulation, panneau solaire photovoltaïque, procédé de fabrication d'un ruban de tabulation de cellule solaire, machine permettant la fabrication d'un ruban de tabulation de cellule solaire
US9698292B2 (en) 2010-12-16 2017-07-04 Solarworld Innovations Gmbh Tabbing ribbon and photovoltaic solar panel
EP2669954A4 (fr) * 2011-01-28 2017-06-21 Panasonic Intellectual Property Management Co., Ltd. Cellule solaire et module de cellule solaire
WO2012123148A3 (fr) * 2011-03-15 2012-11-15 Robert Bosch Gmbh Procédé de fabrication d'un ensemble de cellules solaires
EP2854181A1 (fr) * 2013-09-27 2015-04-01 Lg Electronics Inc. Cellule solaire
US11139406B2 (en) 2013-09-27 2021-10-05 Lg Electronics Inc. Solar cell
JP2022000916A (ja) * 2014-05-27 2022-01-04 サンパワー コーポレイション こけら葺き状太陽電池モジュール
JP7369746B2 (ja) 2014-05-27 2023-10-26 マキシオン ソーラー プライベート リミテッド こけら葺き状太陽電池モジュール
US11942561B2 (en) 2014-05-27 2024-03-26 Maxeon Solar Pte. Ltd. Shingled solar cell module
US11949026B2 (en) 2014-05-27 2024-04-02 Maxeon Solar Pte. Ltd. Shingled solar cell module
CN105023967A (zh) * 2015-07-24 2015-11-04 苏州宇邦新型材料股份有限公司 梯形焊带及其光伏组件和制备方法
CN114871558A (zh) * 2022-05-13 2022-08-09 湖北钛时代新能源有限公司 软连接极板的制备方法

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