WO2020093404A1 - 光伏电池模组及其制备方法 - Google Patents

光伏电池模组及其制备方法 Download PDF

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Publication number
WO2020093404A1
WO2020093404A1 PCT/CN2018/114926 CN2018114926W WO2020093404A1 WO 2020093404 A1 WO2020093404 A1 WO 2020093404A1 CN 2018114926 W CN2018114926 W CN 2018114926W WO 2020093404 A1 WO2020093404 A1 WO 2020093404A1
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Prior art keywords
photovoltaic cell
tape
rows
cell unit
interconnected conductive
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PCT/CN2018/114926
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English (en)
French (fr)
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武宇涛
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武宇涛
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Priority to PCT/CN2018/114926 priority Critical patent/WO2020093404A1/zh
Publication of WO2020093404A1 publication Critical patent/WO2020093404A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • 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 the field of photovoltaic technology, in particular to a photovoltaic cell module and a preparation method thereof.
  • photovoltaic cells can be divided into single-sided power cells and double-sided power cells.
  • the front and back sides (also called A-side and B-side) of a single-sided power generation cell have an electrode structure, and are usually called front and back electrodes (also called A-side and B-side electrodes).
  • the front electrode includes two functional parts, namely a thin grid line and a front bus electrode (also called a wide grid line).
  • the thin grid line is used to collect the photo-generated current, and the collected photo-generated current is collected on the front bus electrode and then led out.
  • the back electrode includes the back electric field and the back bus electrode. The back electric field is used for back passivation and reflection.
  • the back bus electrode and the front bus electrode are arranged symmetrically and the number and position of the two are the same.
  • the front and back sides of the double-sided power generation cell have a structure that can generate electricity, and can absorb light that is direct and reflected by the ground or other objects.
  • the structure of the front electrode and the back electrode of the double-sided power generation cell are similar, and they are composed of thin grid lines and bus electrodes.
  • the bus electrodes of both the front electrode and the opposite electrodes of the double-sided power generation cell are arranged symmetrically.
  • a plurality of photovoltaic cells are connected in a string and assembled to obtain a photovoltaic cell module.
  • the production method of photovoltaic cell modules is usually to cut a flat welding tape into two photovoltaic cell-sized lengths, and then weld half the length of the flat welding tape to the front electrode of a photovoltaic cell. The other half of the tape is welded to the opposite electrode of another adjacent photovoltaic cell, and the photovoltaic cells are connected in series one by one by a string welding machine.
  • welding ribbons also known as special-shaped welding ribbons
  • flat welding ribbons with triangular stripes rolled on the surface and circular cross-sections.
  • Round welding tape, or triangular welding tape with a triangular cross section can be used in place of flat welding strips to connect photovoltaic cells in series.
  • soldering tape no matter what kind of soldering tape is used, there is a large gap between the photovoltaic cells connected in series according to the current process, which causes a waste of space and cannot effectively use the spacing area of the photovoltaic cells.
  • the conventional standard photovoltaic cell is cut into multiple pieces of the same size, for example, into 4, 5 or 6 pieces, and then on the long side of the small piece Conductive glue is arranged on the edge, and the two adjacent small pieces are electrically connected by the conductive glue, so as to realize the interconnection of the photovoltaic cells.
  • This process can save flat solder ribbon and special-shaped solder ribbon, and there is no main grid line on the front side of the small piece, the light receiving area is increased, the spacing between adjacent small pieces is smaller, the spacing position of the small pieces can be used more, and more Power output.
  • this technology also has obvious shortcomings: First, the photovoltaic cells are cut too many times.
  • the double-sided power generation cells are more likely to be broken during multiple cuttings.
  • the technological requirements of the group are higher.
  • the cut pieces have to be connected in series by conductive glue, which leads to a relatively low equipment capacity;
  • the third is that the equipment of this process is too complicated and expensive;
  • fourth, relative to recent years The emergence of the technology of using triangle welding tape series welding interconnection technology, this technology actually improves the power is not very high.
  • the object of the present invention is to provide a photovoltaic cell module and a method for manufacturing the same, which solves the problem that there is a large gap between the photovoltaic cells connected in series in the prior art, which causes a waste of space and cannot effectively use the spacing area of the photovoltaic cells
  • the problem is to achieve a gap-free series connection between photovoltaic cells.
  • the photovoltaic cell module includes a plurality of photovoltaic cell units, a plurality of sets of opposite-side interconnected conductive tapes, and a plurality of sets of front-side interconnected conductive tapes.
  • Each photovoltaic cell unit has multiple front electrodes and multiple back electrodes.
  • the two ends of each reverse conductive strip are overlapped with two adjacent photovoltaic cell units, and each reverse conductive strip of the same group covers the opposite electrode of the same photovoltaic cell unit one by one and extends and overlaps On the front electrode of another adjacent photovoltaic cell unit.
  • Each front-side conductive strip of the same group covers the front electrodes of the same photovoltaic cell unit in one-to-one correspondence. One end of each front-side conductive strip does not exceed the edge of the photovoltaic cell unit and overlaps with the same front electrode.
  • the interconnected conductive strips on the back side are connected and connected, and all photovoltaic cell units are connected in series through the interconnected conductive strip on the reverse side and the conductive conductive band on the front side.
  • the distance between two adjacent photovoltaic cell units is less than or equal to 0.5 mm.
  • the interconnected conductive tape on the reverse side is a tinned copper flat ribbon.
  • the tinned copper flat ribbon includes a copper substrate and two tinned layers. The two tinned layers are distributed on both sides of the copper substrate, respectively.
  • the thickness of the material is 0.02mm-0.1mm, and the thickness of the tin plating layer is 5um-35um.
  • the back-side interconnected conductive tape is a copper mesh tape composed of tinned copper wires, the diameter of the copper wire is 0.02 mm-0.1 mm, and the thickness of the copper mesh tape is 0.05 mm-0.2 mm.
  • the front-side interconnection conductive tape is selected from one of tin-plated copper flat tape, triangular solder tape, or round solder tape.
  • the surfaces of the front-side interconnected conductive tape and the back-side interconnected conductive tape are coated with a tin coating layer.
  • the overlapping length of the back-side interconnected conductive tape and the front-side interconnected conductive tape is 0.5 mm-5 mm.
  • the photovoltaic cell units are arranged into 6 rows 21 rows, 6 rows 25 rows, 10 rows 12 rows, 10 rows 13 rows, 10 rows 14 rows, 12 rows 12 rows, 12 rows 13 rows , One of 12 columns and 14 rows; or the photovoltaic cell units are arranged into 2 blocks, each block is arranged into 6 columns and 11 rows, 6 columns and 12 rows, 6 columns and 13 rows or 6 columns One of 14 rows.
  • the present invention further provides a method for manufacturing a photovoltaic cell module, including the following steps:
  • One end of the adjacent interconnected conductive tapes of the adjacent group overlap and conduct in a one-to-one correspondence, so that the overlapping position of the reverse interconnected conductive tape and the front interconnected conductive tape does not exceed the edge of the photovoltaic cell unit.
  • the overlapping length of the back-side interconnected conductive tape and the front-side interconnected conductive tape is 0.5 mm-5 mm.
  • the present invention further provides a method for manufacturing a photovoltaic cell module, including the following steps:
  • a Alternately arrange multiple sets of interconnected conductive tapes and multiple photovoltaic cells on the platform in turn in the order of a set of interconnected conductive tapes and one photovoltaic cell unit, so that the reverse side of each photovoltaic cell unit
  • the electrodes are aligned one-to-one and cover the same group of back-side interconnected conductive tapes, and one end of the back-side interconnected conductive tape extends to the front electrode of one adjacent photovoltaic cell unit, the distance between two adjacent photovoltaic cell units is less than Or equal to 0.5mm;
  • the overlapping length of the back-side interconnected conductive tape and the front-side interconnected conductive tape is 0.5 mm-5 mm.
  • the back-side interconnected conductive tape of the present invention uses ultra-thin and ultra-soft materials. Taking advantage of the material's ultra-thin and super-soft characteristics, the back-side interconnected conductive tape can extend from the back electrode of one photovoltaic cell unit to another adjacent photovoltaic cell On the front electrode of the cell, and the reverse interconnected conductive tape overlaps the front interconnected conductive tape bonded to the front of the photovoltaic cell unit.
  • the overlapping position of the reverse interconnected conductive tape and the front interconnected conductive tape is completely in the front position of the photovoltaic cell unit, rather than the position between two photovoltaic cell units as in the conventional technology, so that two adjacent photovoltaic cells
  • the spacing between the sheets can be relatively narrowed, and even gap-free series connection between the photovoltaic cell units can be realized, to avoid the waste of space caused by the existence of a large spacing between the photovoltaic cell units, and to realize the effective use of photovoltaic cells
  • the spacing area of the cell is equivalent to increasing the light-receiving area of the photovoltaic cell module and improving the power generation efficiency.
  • Figure 1 is a schematic diagram of the structure of the front and back of a standard photovoltaic cell
  • FIG. 2 is a schematic structural view of the front and back sides of the standard photovoltaic cell in FIG. 1 after being divided in half;
  • FIG. 3 is a schematic flow chart of a method for manufacturing a photovoltaic cell module provided by the present invention.
  • FIG. 4 is a schematic structural view of a photovoltaic cell module in which photovoltaic cell units are connected in series according to the preparation method shown in FIG. 3;
  • FIG. 5 is a schematic flow chart of another method for manufacturing a photovoltaic cell module provided by the present invention.
  • FIG. 6 is a schematic structural view of a photovoltaic cell module prepared by connecting photovoltaic cell units in series according to the preparation method shown in FIG. 5;
  • FIG. 7 shows a form in which the photovoltaic cell modules in FIG. 4 or FIG. 6 are laid out in series again for packaging as a finished product;
  • FIG. 8 shows another form in which the photovoltaic cell modules in FIG. 4 or FIG. 6 are laid out in series again for packaging as a finished product.
  • the invention provides a photovoltaic cell module.
  • the distance between two adjacent photovoltaic cell units of the photovoltaic cell module is very small, and even a series connection between photovoltaic cell units without gaps is realized, which fully and effectively utilizes the photovoltaic cell unit. Spacing area.
  • the photovoltaic cell module includes a plurality of photovoltaic cell units 10, multiple sets of reverse-side interconnected conductive tapes 20, and multiple sets of front-side interconnected conductive tapes 30.
  • the photovoltaic cell unit 10 includes conventional photovoltaic cells of different sizes, and also includes small pieces obtained by cutting the conventional photovoltaic cells after cutting, for example, cutting into two equal or three equal parts;
  • the photovoltaic cell unit 10 may be a single crystal cell or a polycrystalline cell;
  • the photovoltaic cell unit 10 may be a single-sided power cell or a double-sided power cell.
  • FIG. 1 is a structure of a conventional photovoltaic cell sheet, and FIGS. 2 and 3 are small pieces obtained after cutting the conventional photovoltaic cell sheet into two equal parts.
  • Each photovoltaic cell unit 10 has a plurality of front electrodes 11 and a plurality of back electrodes 12.
  • the front electrode 11 and the back electrode 12 are located on the front and back of the photovoltaic cell unit, respectively.
  • a plurality of photovoltaic cell units 10 are connected in series by a reverse interconnected conductive tape 20 joined to the reverse side of the photovoltaic cell unit 10 and a front interconnected conductive tape 30 joined to the front side of the photovoltaic cell unit 10 to form the photovoltaic cell module.
  • the front surface of the photovoltaic cell unit 10 refers to the light-receiving surface, and the reverse surface refers to the backlight surface.
  • the back-side interconnected conductive tape 20 is an ultra-thin and ultra-soft material, and the back-side interconnected conductive tape 20 is joined and conducted with the back-side electrode of the photovoltaic cell unit 10.
  • the surface of the back surface interconnecting conductive tape 20 is coated with a tin coating layer, or the surface of the back surface interconnecting conductive tape 20 is coated with a solderable tin coating layer containing lead and / or silver, and the thickness of the tin coating layer is 10um-30um.
  • the interconnected conductive tape 20 on the reverse side is a tinned copper flat ribbon.
  • the tinned copper flat ribbon includes a copper substrate and two tinned layers. The two tinned layers are distributed on both sides of the copper substrate, respectively.
  • the thickness of the material is 0.02mm-0.1mm, and the width of the copper substrate is 0.5mm-3.0mm.
  • the thickness of the tinned layer is 5um-35um.
  • the interconnected conductive tape 20 on the reverse side is a copper mesh tape made of tinned copper wire, the diameter of the copper wire is 0.02 mm-0.1 mm, the thickness of the copper mesh tape is 0.05 mm-0.2 mm, and the The width is 1mm-10mm.
  • each interconnected conductive strip 20 is overlapped with two adjacent photovoltaic cell units 10 respectively, and each of the interconnected conductive strips 20 of the same group covers the opposite electrode of the same photovoltaic cell unit 10 in one-to-one correspondence And extend to overlap the front electrode of another adjacent photovoltaic cell unit 10.
  • the front-side interconnected conductive tape 30 is joined to and electrically connected to the front-side electrode of the photovoltaic cell unit 10.
  • the front-side interconnected conductive tape 30 is selected from one of tin-plated copper flat tape, triangular solder tape, or round solder tape.
  • the triangular welding strip refers to a welding strip with a triangular cross section
  • the circular welding strip refers to a welding strip with a circular cross section.
  • the tinned copper flat ribbon may be a copper flat ribbon with a triangular pattern, or a common copper flat ribbon without a triangular pattern.
  • the front-side interconnected conductive tape 30 adopts a triangular welding tape, so that the triangular welding tape is joined to the front electrode of the photovoltaic cell unit 10, which not only has the best light reflecting performance, but also facilitates the photovoltaic cell unit 10 to absorb light, and the triangle welding
  • the triangular welding tape is joined to the front electrode of the photovoltaic cell unit 10, which not only has the best light reflecting performance, but also facilitates the photovoltaic cell unit 10 to absorb light, and the triangle welding
  • the electrical conductivity and process performance of the belt are the best.
  • the surface of the front-side interconnecting conductive tape 30 is coated with a tin coating layer, or the surface of the front-side interconnecting conductive tape 30 is coated with a solderable tin coating layer containing lead and / or silver, and the thickness of the tin coating layer is 10um-30um.
  • Each front-side interconnected conductive tape 30 of the same group covers the front electrode of the same photovoltaic cell unit 10 in one-to-one correspondence, and one end of each front-side interconnected conductive tape 30 does not exceed the edge of the photovoltaic cell unit 10 and overlaps with the same
  • the conductive strips 20 on the reverse side of one front electrode are connected and connected.
  • the overlapping length of the back-side interconnecting conductive tape 20 and the front-side interconnecting conductive tape 30 is 0.5 mm-5 mm.
  • All photovoltaic cell units 10 are connected in series through the reverse interconnected conductive tape 20 and the front interconnected conductive tape 30 to form the photovoltaic cell module.
  • the distance between two adjacent photovoltaic cell units 10 is less than or equal to 0.5 mm.
  • the length of the photovoltaic cell module composed in series is the total length of 12-16 photovoltaic cell units 10, that is to say, the photovoltaic cell module is composed of 12-16 photovoltaic cells in the length direction
  • the slice unit is composed in series.
  • the photovoltaic cell module may have other lengths.
  • the photovoltaic cell units 10 connected in series in the longitudinal direction can also be arranged in series again, for example, horizontal and vertical versions can be used for parallel and stacking, and all the series used for each module are connected in series
  • the photovoltaic cell modules are connected as a whole.
  • the sizes of conventional photovoltaic cells are expressed in the form of "length * width", which are 156mm * 156mm, 156.75mm * 156.75mm, 157mm * 157mm, 160mm * 157mm.
  • Conventional photovoltaic cell module specifications are expressed in the form of "column number * row number” with 6 * 10 or 6 * 12 photovoltaic cells arranged in series. If the conventional 156mm * 156mm size photovoltaic cell sheet is cut in half, the size of the obtained photovoltaic cell unit 10 is 156mm * 78mm, and the size of the photovoltaic cell unit 10 of other cutting methods is deduced by analogy.
  • the photovoltaic cell units 10 are arranged into 6 rows 21 rows, 6 rows 25 rows, 10 rows 12 rows, 10 rows 13 rows, 10 rows 14 rows, 12 rows 12 rows, 12 rows 13 rows, 12 rows 14 One of the rows; or the photovoltaic cell unit 10 is arranged into 2 blocks, each block is arranged in the form of 6 columns 11 rows, 6 columns 12 rows, 6 columns 13 rows or 6 columns 14 rows Kind of.
  • layouts of the photovoltaic cell units 10 in the vertical layout and the horizontal layout. For example, FIG. 7 is the vertical layout and FIG. 8 is the horizontal layout.
  • the photovoltaic cell units 10 obtained by cutting a conventional photovoltaic cell in half are cut in series, that is, the photovoltaic cell size of 156mm * 156mm is cut in half, and the size of the obtained photovoltaic cell unit 10 is 156mm * 78mm
  • the specifications of the vertical layout are expressed in the form of "number of columns * number of rows” or "(number of columns * number of rows * number of blocks)", which can be 6 * 21 (number of columns * number of rows), 6 * 25, 6 * 11 * 2 (number of columns * number of rows * number of blocks), 6 * 12 * 2, 6 * 13 * 2, 6 * 14 * 2 or one of other forms.
  • Figure 7 shows the specifications of 6 * 13 * 2.
  • the specification of the horizontal layout can be 10 * 12, 10 * 13, 10 * 14, 12 * 12, 12 * 13, 12 * 14 or one of other forms.
  • Figure 8 shows the 12 * 13 specification.
  • the specification of the horizontal layout is 10 * 13 or 12 * 13
  • the specification of the vertical layout is one of 6 * 12 * 2, 6 * 13 * 2, 6 * 14 * 2 or 6 * 15 * 2 .
  • the layout of the horizontal layout and the vertical layout may also be other layouts according to circumstances. It can be understood that, in the solution of the present invention, the pitch of the photovoltaic cell units 10 is smaller than that of the conventional technology, so for the same conventional-sized photovoltaic cell module, the number of photovoltaic cell units 10 that can be arranged More, allowing for more diverse arrangements and better flexibility.
  • the present invention further provides a first method for manufacturing a photovoltaic cell module.
  • the preparation method of the photovoltaic cell module includes the following steps:
  • One end of 20 extends outside the photovoltaic cell unit 10 and overlaps with one end of the adjacent group of front-side interconnecting conductive strips 30 in one-to-one correspondence, so that the back-side interconnecting conductive strip 20 and the front-side interconnecting conductive strip 30 overlap The position does not exceed the edge of the photovoltaic cell unit 10.
  • FIG. 3 specifically shows a first schematic flowchart of preparing the photovoltaic cell module according to the above preparation method.
  • a triangular soldering tape is selected as the front-side interconnecting conductive tape 30.
  • first, several groups of front-side interconnected conductive tapes 30 are positioned on the welding platform of the string welding machine or the platform of the belt at equal intervals and arranged horizontally.
  • Each front interconnection conductive tape 30 has the same length.
  • the number and pitch of each group of front-side conductive strips 30 are consistent with the number and pitch of the front electrodes of the photovoltaic cell units 10 to be connected in series.
  • the step B includes the following steps:
  • One end of the front-side interconnection conductive tape 30 is positioned on the photovoltaic cell unit 10 at a position of 1 mm-10 mm from the edge of the photovoltaic cell unit 10, and the other end of the front-side interconnection conductive tape 30 protrudes out of the photovoltaic cell unit 10 as a head.
  • the reverse interconnected conductive tape 20 is located above the photovoltaic cell unit 10 and can cover the reverse electrode.
  • One end of the back-side interconnected conductive tape 20 does not extend beyond the edge of the photovoltaic cell unit 10, and the other end of the back-side interconnected conductive tape 20 extends beyond the edge of the photovoltaic cell unit 10 and overlaps the end of the adjacent second set of front-side interconnected conductive tape 30 Pick up.
  • the overlapping length of the back-side interconnecting conductive tape 20 and the front-side interconnecting conductive tape 30 is 0.5 mm-5 mm.
  • the second photovoltaic cell unit 10 is on the front side, rather than between the first photovoltaic cell unit 10 and the second photovoltaic cell unit 10.
  • the distance between the second photovoltaic cell unit 10 and the first photovoltaic cell unit 10 can be controlled within a range of less than or equal to 0.5 mm.
  • B4 According to the sequence of B1, B2, and B3, place and join the other photovoltaic cell units 10, the back-side interconnected conductive tape 20, and the front-side interconnected conductive tape 30 until the last photovoltaic cell unit 10 is placed. At this time, the last set of interconnected conductive tapes 20 protruding a long distance from the edge of the last photovoltaic cell unit 10 as the tail ends. At this point, the interconnection string welding of the photovoltaic cell unit 10 is completed.
  • one photovoltaic cell unit 10 is placed on a group of front-side interconnected conductive tapes 30 on a one-to-one basis, and a group of backside interconnected conductive is placed on each photovoltaic cell unit 10 on a one-to-one basis Band 20.
  • the overlapping end of the front-side interconnecting conductive tape 30 and the back-side interconnecting conductive tape 20 does not exceed the edge of the photovoltaic cell unit 10, that is, one end of the front-side interconnecting conductive tape 30 is located within the front surface of the photovoltaic cell unit 10 and does not extend Outside the photovoltaic cell unit 10.
  • the present invention further provides a second method for manufacturing a photovoltaic cell module, including the following steps:
  • a. Alternately arrange a plurality of sets of interconnected conductive tapes 20 and a plurality of photovoltaic cell units 10 on the platform in turn in the order of a set of interconnected conductive tapes 20 and a photovoltaic cell unit 10 in turn, so that each photovoltaic cell
  • the back electrodes of the sheet unit 10 are aligned one-to-one correspondingly and cover the same group of back-side interconnecting conductive tapes 20, and one end of the back-side interconnecting conductive band 20 extends to the front electrode of an adjacent photovoltaic cell unit 10, two adjacent
  • the spacing of the photovoltaic cell units 10 is less than or equal to 0.5mm;
  • FIG. 5 specifically shows a schematic flow chart of specifically preparing the photovoltaic cell module according to the second preparation method.
  • step a includes the following steps:
  • the photovoltaic cell unit 10 is in a state where the reverse side is facing downward and the front side is facing upward, and the lower conductive interconnecting belt 20 is pressed.
  • One end of the back-side interconnected conductive tape 20 does not protrude from the edge of the photovoltaic cell unit 10, and the other end of the back-side interconnected conductive tape 20 serves as a head extending beyond the edge of the photovoltaic cell unit 10 by 5-10 mm.
  • Each reverse side interconnected conductive tape 20 has the same length. The number and pitch of the interconnected conductive strips 20 on the back of each group are consistent with the number and pitch of the electrodes on the back of the photovoltaic cell unit 10.
  • a2 Place a second group of reverse-side interconnected conductive tapes 20 adjacent to the first photovoltaic cell unit 10 so that one end of the reverse-side interconnected conductive tape 20 is placed on the front electrode of the first photovoltaic cell unit 10 and the reverse side is interconnected The other end of the conductive tape 20 does not exceed the edge of the photovoltaic cell unit 10.
  • the overlapping length of the second group of interconnected conductive strips 20 and the first photovoltaic cell unit 10 is 1 mm-10 mm.
  • a first group of front-side interconnecting conductive tapes 30 is placed on the front electrodes of the first photovoltaic cell unit 10, so that the front-side electrodes of the photovoltaic cell unit 10 correspond to the front-side interconnecting conductive tape 30 pairs
  • one end of the front-side interconnected conductive tape 30 overlaps the second set of back-side interconnected conductive tape 20.
  • the overlapping length of the back-side interconnecting conductive tape 20 and the front-side interconnecting conductive tape 30 is 0.5 mm-5 mm.
  • the front interconnection conductive tapes 30 of the other groups are placed and joined on the other photovoltaic cell units 10 in sequence until the last front interconnection conductive tape 30 is placed. At this time, one end of the last group of front-side interconnected conductive tapes 30 extends 5 mm-10 mm outside the photovoltaic cell unit 10 as a tail, and thus the interconnection string welding of the photovoltaic cell unit 10 is completed.
  • step a3 and the step b is not limited.
  • step a2 is completed, that is, after the second set of interconnected conductive tapes 20 are placed adjacent to the first photovoltaic cell unit 10, the second photovoltaic cell unit 10, the first Three sets of reverse conductive interconnection belts 20, a third photovoltaic cell unit 10 ..., and then a first group of front interconnection conductive tapes 30 on the first photovoltaic cell unit 10, and a second photovoltaic cell unit 10
  • a second group of front-side interconnecting conductive tapes 30 is placed, and a third group of front-side interconnecting conductive tapes 30 is placed on the third photovoltaic cell unit 10.
  • step a2 that is, after placing the second set of interconnected conductive strips 20 adjacent to the first photovoltaic cell unit 10, first place the first on the first photovoltaic cell unit 10 A group of front-side interconnected conductive tapes 30, then a second group of photovoltaic cell units 10 is placed on the second group of back-side interconnected conductive tapes 20, and then a third group of back-side interconnected conductive tapes 20 is placed on the second photovoltaic cell unit 10, Then, place a second group of front-side conductive strips 30 on the second photovoltaic cell unit 10, and so on.
  • the front-side interconnected conductive tape 30 may be one of tin-plated copper flat welding tape, triangular welding tape, round welding tape, or other structures of welding tape .
  • the photovoltaic cell unit 10, the back-side interconnected conductive tape 20 and the front-side interconnected conductive tape 30 are finally fixed by a high-temperature welding process, but for certain products that cannot withstand high temperatures, low-temperature bonding of conductive adhesive can also be used Realize fixed and electrical conduction.
  • the present invention utilizes the ultra-thin and ultra-soft characteristics of the back-side interconnected conductive tape 20 to connect the overlapped series welding position of the front-side interconnected conductive tape 30 and the back-side interconnected conductive tape 20 from the outer gap between two adjacent photovoltaic cell units 10 Change to the inside of the front surface of the photovoltaic cell unit 10, and at the same time greatly reduce the spacing of the photovoltaic cell unit 10 to within 0.5mm without causing the photovoltaic cell unit 10 to crack, making more efficient use of the front light receiving area of the photovoltaic cell module
  • the front interconnection conductive tape can also use a welding tape with a higher light absorption rate, such as a triangular welding tape, thereby achieving the goals of improving the power generation efficiency of the photovoltaic cell module and reducing the unit cost of the photovoltaic cell module.
  • the ultra-thin and softer back-side interconnecting conductive tape 20 allows a variety of different front-side interconnecting conductive tapes to be matched, thereby improving the applicability of the process or the machine itself.
  • the present invention is preferably applicable to string welding between photovoltaic cell units 10 after the conventional photovoltaic cell is divided into two, three or four quarters, considering the comprehensive factors such as production capacity, cost, power, etc.
  • the photovoltaic cell unit 10 after the bisector cutting of the conventional photovoltaic cell is interconnected in series welding.
  • the present invention can be used to prepare the following typical different types of horizontal photovoltaic cell modules:
  • the photovoltaic cell module is adopted for string welding, that is, the photovoltaic cell unit 10 is face-down.
  • An ultra-thin tinned copper flat ribbon is used as the interconnecting conductive tape 30 on the reverse side, with a thickness of 0.08 mm and a width of 2 mm.
  • the prepared photovoltaic cell module is composed of 10 or 12 strings of photovoltaic cell units 10 arranged horizontally, and each string contains 13 photovoltaic cell units 10, as shown in FIG. 8.
  • the first method that is, the solution where the photovoltaic cell unit 10 is facing downward
  • the second method that is, the solution where the photovoltaic cell unit 10 is facing upward
  • the triangle interconnection tape can be used for the front-side interconnection conductive tape, but if the triangle welding tape is used, the first method for preparing the photovoltaic cell module must be used for string welding.
  • the conventional flat welding tape is used as the reverse interconnection conductive tape 20.
  • the reverse interconnection conductive tape 20 generally adopts a size of 1.0mm * 0.2mm; for the 4-grid photovoltaic cell unit 10, the reverse interconnection conductive The belt 20 generally adopts a size of 1.2 mm * 0.2 mm.
  • the prepared photovoltaic cell module is composed of 10 or 12 strings of horizontally arranged photovoltaic cell units 10, and each string contains 13 photovoltaic cell units 10, as shown in FIG. 8.
  • the ground-front interconnection conductive tape 30 uses conventional flat solder tape. Both the first and the second photovoltaic cell module preparation methods can be applied during string welding.
  • the triangular welding tape when the length of the cross-sectional side of the triangular welding tape is reduced to less than 0.5mm, the triangular welding tape can be preferably used for the interconnection string welding of double-sided power generation cells with multi-main grid design
  • the first method for preparing the photovoltaic cell module that is, the solution in which the photovoltaic cell unit 10 is face down can be adopted.
  • the prepared photovoltaic cell module is composed of 10 or 12 strings of horizontally arranged photovoltaic cell units 10, and each string contains 13 photovoltaic cell units 10, as shown in FIG. 8.
  • the present invention can also be used to prepare different vertical solar cell modules with the same layout, as the three typical applications of the horizontal version above, except that in the vertical version, the prepared photovoltaic cell module is divided into upper and lower symmetrical rows
  • Each photovoltaic cell unit 10 is composed of 12 strings of vertically arranged photovoltaic cell units 10, and each string contains 13 or 15 photovoltaic cell units 10, as shown in FIG. 7.
  • the following three embodiments are the characteristics of three specific types of photovoltaic cell modules, the characteristics of the front-side interconnected conductive tape 30 and the back-side interconnected conductive tape 20, and the complete preparation process.
  • Embodiment 1 Single-poly single-sided or double-sided battery + triangle welding tape + horizontal version
  • photovoltaic cell unit 10 single-crystal or polycrystalline P-type single-sided or double-sided power generation cells, which are cut in half from a standard size photovoltaic cell of 156.75 * 156.75 in half. There are 7 front electrodes with a width of 0.3mm, the front electrode spacing is 22.1mm, and the back electrode is divided into two sections.
  • Preparation of the front-side interconnection conductive tape 30 and the back-side interconnection conductive tape 20 0.08mm * 2mm ultra-thin tinned copper flat ribbon is used as the backside interconnection conductive ribbon 20, and the thickness of the single-sided tin plating layer of the tinned copper flat ribbon is 0.015mm.
  • a tin-plated triangular solder tape is used as the front-side interconnection conductive tape, the cross-sectional side length is 0.5 mm, and the thickness of the tin-plated layer is 0.015 mm.
  • the 13 photovoltaic cell units 10 Adopting the first method of preparing photovoltaic cell modules, that is, the photovoltaic cell unit 10 with the front side facing down, the 13 photovoltaic cell units 10 are connected in series first, and the front and rear interconnected conductive strips 30 and the reverse interconnected conductive strips 20 reserved length is 8mm.
  • Example 2 Single-poly single-sided or double-sided battery + triangle welding tape + vertical plate
  • photovoltaic cell unit 10 Single-crystal or polycrystalline P-type single-sided or double-sided power generation cells are cut in half from a standard size photovoltaic cell of 156.75mm * 156.75mm in half. There are 7 front electrodes with a width of 0.3mm, the front electrode spacing is 22.1mm, and the back electrode is divided into two sections.
  • Preparation of the front-side interconnection conductive tape 30 and the back-side interconnection conductive tape 20 0.08mm * 2mm ultra-thin tinned copper flat ribbon is used as the backside interconnection conductive ribbon 20, and the thickness of the single-sided tin plating layer of the tinned copper flat ribbon 0.015mm.
  • a tin-plated triangular solder tape is used as the front-side interconnection conductive tape, the cross-sectional side length is 0.5 mm, and the thickness of the tin-plated layer is 0.015 mm.
  • the 13 photovoltaic cell units 10 Adopting the first method of preparing photovoltaic cell modules, that is, the photovoltaic cell unit 10 with the front side facing down, the 13 photovoltaic cell units 10 are connected in series first, and the front and rear interconnected conductive strips 30 and the reverse interconnected conductive strips 20 reserved length is 8mm.
  • photovoltaic cell unit 10 single crystal or polycrystalline single-sided or double-sided power generation cell, cut in half by standard size photovoltaic cells of 156.75 * 156.75 into two halves, 5 front electrodes, width 1.0 mm, the back electrode is divided into two sections.
  • Preparation of the front-side interconnection conductive tape 30 and the back-side interconnection conductive tape 20 0.08mm * 2mm ultra-thin tinned copper flat ribbon is used as the backside interconnection conductive ribbon 20, and the thickness of the single-sided tin plating layer of the tinned copper flat ribbon is 0.015mm.
  • a conventional flat welding tape is used as the front-side interconnection conductive tape 30, and the size is 1.0mm * 0.2mm.
  • bus bar bus bar
  • glass backplane
  • EVA or POE
  • aluminum frame junction box and other materials and subsequent lamination test are the same as those of conventional components.
  • the 13 photovoltaic cell units 10 Adopting the first method of preparing photovoltaic cell modules, that is, the photovoltaic cell unit 10 with the front side facing down, the 13 photovoltaic cell units 10 are connected in series first, and the front and rear interconnected conductive strips 30 and the reverse interconnected conductive strips 20 reserved length is 8mm.
  • Embodiment 4 single polycrystalline single-sided or double-sided battery + flat welding tape + vertical plate
  • photovoltaic cell unit 10 Single-crystal or polycrystalline single-sided or double-sided power generation cells are cut in half from a standard size photovoltaic cell of 156.75 * 156.75 in half. There are 5 front electrodes with a width of 1.0mm, and the back electrode is divided into two sections.
  • Preparation of the front-side interconnection conductive tape 30 and the back-side interconnection conductive tape 20 0.08mm * 2mm ultra-thin tinned copper flat ribbon is used as the backside interconnection conductive ribbon 20, and the thickness of the single-sided tin plating layer of the tinned copper flat ribbon is 0.015mm.
  • a conventional flat welding tape is used as the front-side interconnection conductive tape 30, and the size is 1.0mm * 0.2mm.
  • bus bar bus bar
  • glass backplane
  • EVA or POE
  • aluminum frame junction box and other materials and subsequent lamination test are the same as those of conventional components.
  • the photovoltaic cell unit 10 with the front side facing down will have 13 pieces (respectively corresponding to the conventional 60-piece type photovoltaic cell modules) or 15 pieces (respectively corresponding to the conventional 72-piece type (Photovoltaic cell module)
  • the photovoltaic cell units 10 are connected in series first, and the reserved length of the front and rear interconnected conductive tapes 30 and 20 are 8 mm.

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Abstract

一种光伏电池模组及其制备方法，光伏电池模组包括多个光伏电池片单元（10）、多组反面互联导电带（20）以及多组正面互联导电带（30）。反面互联导电带（20）为超薄超软材料，每个反面互联导电带（20）的两端分别搭接于相邻的两个光伏电池片单元（10），同一组的每个反面互联导电带（20）一一对应地覆盖同一个光伏电池片单元（10）的反面电极（12）并延伸搭接于相邻的另一个光伏电池片单元（10）的正面电极（11）。每个正面互联导电带（30）的一端不超过光伏电池片单元（10）的边缘并和搭接于同一个正面电极（11）的反面互联导电带（20）搭接导通，相邻两个光伏电池片单元（10）的间距小于或等于0.5mm。这样缩小了光伏电池片单元（10）之间的间距，甚至实现无间距串联，有效利用光伏电池片单元（10）的间距区域，相当于增加了受光面积，提升发电效率。

Description

光伏电池模组及其制备方法 技术领域
本发明涉及光伏技术领域，尤其涉及一种光伏电池模组及其制备方法。
背景技术
光伏电池片根据技术工艺可以分为单面发电电池片和双面发电电池片。单面发电电池片的正面和反面(也称A面和B面)都具有电极结构，通常称为正面电极和反面电极(也称A面电极和B面电极)。其中正面电极包括两个功能部分，分别为细栅线和正面汇流电极(也称宽栅线)。细栅线用于收集光生电流，收集到的光生电流汇集到正面汇流电极上再导出。反面电极包括反面电场和反面汇流电极，反面电场用于进行反面钝化和反射，反面汇流电极和正面汇流电极呈对称设置且两者的数量位置均一致。而双面发电电池的正面和反面都具有可以发电的结构，都能吸收直射和经地面或其他物体反射的光。双面发电电池的正面电极和反面电极的结构类似，均由细栅线和汇流电极组成。一般而言，双面发电电池的正面电极和反两电极两者的汇流电极对称设置。
将多个光伏电池片连接成串并进行组装即得到光伏电池模组。目前，光伏电池模组的生产方法通常是将一根扁焊带裁切成两个光伏电池片大小的长度，然后将扁焊带的一半长度焊接在一片光伏电池片的正面电极上，扁焊带的另一半长度焊接在相邻的另一片光伏电池片的反面电极上，通过串焊机逐个将光伏电池片串联起来。近年来，行业内为了提高光伏电池片正面的受光率，还开发了各种不同形式的焊带(也叫异型焊带)，例如表面轧制有三角形条纹的扁焊带、横截面为圆形的圆形焊带，或横截面为三角形的三角形焊带等。可以采用这些异型焊带来代替扁焊带将光伏电池片串联起来。但是不论采用哪种焊带，按照目前的工艺串联后的光伏电池片之间存在较大的间距，造成空间的浪费，不能有效利用光伏电池片的间距区域。
近年来行业内出现了一种新型的叠片互联技术，先将常规标准的光伏电池片切割成多片相同大小的小片，例如切割成4片，5片或6 片，然后在小片的长边边缘设置导电胶，通过导电胶将相邻两片小片电性连接起来，从而实现光伏电池片的互联。这种工艺可以省去扁焊带和异型焊带，且小片的正面没有主栅线，受光面积增多，相邻小片之间的间距更小，可以更多地利用小片的间距位置，产生更多的功率输出。但是这种技术也有明显不足：一是对光伏电池片进行切割次数太多，双面发电电池由于没有常规单面发电电池的铝背场存在而在多次切割时更容易碎，对于后道模组的工艺要求更高。切割后的小片还要通过导电胶串联，导致设备产能比较低；二是导电胶的长期使用其可靠性尚有待验证；三是这种工艺的设备过于复杂且售价高昂；四是相对于近年来出现的采用三角形焊带串焊互联技术，这种技术其实提升的功率也并不是很高。
发明内容
本发明的目的是提供一种光伏电池模组及其制备方法，解决现有技术中串联后的光伏电池片之间存在较大的间距，造成空间的浪费，不能有效利用光伏电池片的间距区域的问题，从而实现光伏电池片之间无间隙串联。
为解决上述问题，本发明提供一种光伏电池模组，所述光伏电池模组包括多个光伏电池片单元、多组反面互联导电带以及多组正面互联导电带。每个光伏电池片单元具有多个正面电极和多个反面电极。每个反面互联导电带的两端分别搭接于相邻的两个光伏电池片单元，同一组的每个反面互联导电带一一对应地覆盖同一个光伏电池片单元的反面电极并延伸搭接于相邻的另一个光伏电池片单元的正面电极。同一组的每个正面互联导电带一一对应地覆盖同一个光伏电池片单元的正面电极，每个正面互联导电带的一端不超过光伏电池片单元的边缘并和搭接于同一个正面电极的反面互联导电带搭接导通，所有的光伏电池片单元通过反面互联导电带和正面互联导电带串联，相邻两个光伏电池片单元的间距小于或等于0.5mm。
根据本发明一实施例，反面互联导电带为镀锡铜扁带，镀锡铜扁带包括铜基材和两层镀锡层，两层镀锡层分别分布于铜基材的两面，铜基材的厚度为0.02mm-0.1mm，镀锡层的厚度为5um-35um。
根据本发明一实施例，反面互联导电带是由镀锡的铜线编成的铜 网带，铜线的直径为0.02mm-0.1mm，铜网带的厚度为0.05mm-0.2mm。
根据本发明一实施例，正面互联导电带选自镀锡铜扁带、三角形焊带或圆形焊带中的一种。
根据本发明一实施例，正面互联导电带和反面互联导电带的表面均涂覆涂锡层。
根据本发明一实施例，反面互联导电带和正面互联导电带搭接的长度为0.5mm-5mm。
根据本发明一实施例，所述光伏电池片单元排布成为6列21排、6列25排、10列12排、10列13排、10列14排、12列12排、12列13排、12列14排的形式中的一种；或者所述光伏电池片单元排布成为2个区块，每个区块排成6列11排、6列12排、6列13排或者6列14排的形式中的一种。
根据本发明的另一方面，本发明进一步提供一种光伏电池模组的制备方法，包括以下步骤：
A、将多组正面互联导电带等间距排布于平台上；
B、以一个光伏电池片单元和一组反面互联导电带的顺序依次轮流地在每一组正面互联导电带上放置一个光伏电池片单元和在每一个光伏电池片单元上放置一组反面互联导电带，使得每个光伏电池片单元的正面电极一一对应地对准并覆盖同一组的每一个正面互联导电带，而且正面互联导电带的一端不超过光伏电池片单元的边缘，相邻两个光伏电池片单元的间距小于或等于0.5mm，反面互联导电带一一对应地对准并覆盖光伏电池片单元的反面电极，而且反面互联导电带的一端延伸于光伏电池片单元之外并和相邻一组的正面互联导电带的一端一一对应地搭接导通，使得反面互联导电带和正面互联导电带的搭接位置不超过光伏电池片单元的边缘。
根据本发明一实施例，反面互联导电带和正面互联导电带搭接的长度为0.5mm-5mm。
根据本发明的另一方面，本发明进一步提供一种光伏电池模组的制备方法，包括以下步骤：
a、以一组反面互联导电带和一个光伏电池片单元的顺序依次轮流交替地将多组反面互联导电带和多个光伏电池片单元排布于平台 上，使得每一个光伏电池片单元的反面电极一一对应地对准并覆盖同一组的反面互联导电带，而且反面互联导电带的一端延伸至相邻的一个光伏电池片单元的正面电极上，相邻两个光伏电池片单元的间距小于或等于0.5mm；
b、在每一个光伏电池片单元上放置一组正面互联导电带，使得正面互联导电带一一对应地对准并覆盖光伏电池片单元的正面电极，而且正面互联导电带的一端不超过所述光伏电池片单元的边缘并和延伸至同一正面电极上的反面互联导电带搭接导通。
根据本发明一实施例，反面互联导电带和正面互联导电带搭接的长度为0.5mm-5mm。
与现有技术相比，本技术方案具有以下优点：
本发明的反面互联导电带采用超薄超软材料，利用材料超薄超软的特性，所述反面互联导电带可以从一个光伏电池片单元的反面电极上延伸至相邻的另一个光伏电池片单元的正面电极上，并且反面互联导电带和接合于光伏电池片单元正面的正面互联导电带搭接。这样反面互联导电带和正面互联导电带的搭接位置完全处于光伏电池片单元的正面位置，而不是像传统技术中那样处于两个光伏电池片单元之间的位置，从而相邻两个光伏电池片之间的间距可以相对缩得更小，甚至实现光伏电池片单元之间无间隙串联，避免光伏电池片单元之间由于存在较大的间距而造成空间的浪费，实现了有效利用光伏电池片单元的间距区域。换而言之，本方案相当于增加了光伏电池模组的受光面积，提升发电效率。
附图说明
图1是标准的光伏电池片正反两面的结构示意图；
图2是图1中标准的光伏电池片被对半分割后的正反两面的结构示意图；
图3是本发明提供的其中一种光伏电池模组的制备方法流程示意图；
图4是根据图3所示的制备方法将光伏电池片单元串联后的光伏电池模组的结构示意图；
图5是本发明提供的另一种光伏电池模组的制备方法流程示意 图；
图6是根据图5所示的制备方法将光伏电池片单元串联后制得的光伏电池模组的结构示意图；
图7展示了图4或图6中的光伏电池模组再次串联排版布局以进行封装为成品的一种形式；
图8展示了图4或图6中的光伏电池模组再次串联排版布局以进行封装为成品的另一种形式。
具体实施方式
以下描述只用于揭露本发明以使得本领域技术人员能够实施本发明。以下描述中的实施例只作为举例，本领域技术人员可以想到其他显而易见的变形。在以下描述中界定的本发明的基本原理可应用于其他实施方案、变形方案、改进方案、等同方案以及其他未背离本发明精神和范围的其他方案。
本发明提供一种光伏电池模组，所述光伏电池模组的相邻两个光伏电池片单元的间距很小，甚至实现光伏电池片单元之间无间隙串联，充分有效利用光伏电池片单元的间距区域。具体地，所述光伏电池模组包括多个光伏电池片单元10、多组反面互联导电带20以及多组正面互联导电带30。
在本发明的揭露中，光伏电池片单元10包括常规不同尺寸的光伏电池片，也包括将常规的光伏电池片经过切割之后获得的小片，例如切割为2等分或3等分后的小片；光伏电池片单元10可以为单晶电池片，也可以为多晶电池片；光伏电池片单元10可以为单面发电电池片，也可以为双面发电电池。图1是常规的光伏电池片的结构，图2和图3是将常规的光伏电池片切割为两等分之后获得的小片。
每个光伏电池片单元10具有多个正面电极11和多个反面电极12。正面电极11和反面电极12分别位于光伏电池片单元的正面和反面。多个光伏电池片单元10通过接合于光伏电池片单元10反面的反面互联导电带20和接合于光伏电池片单元10正面的正面互联导电带30串联组成所述光伏电池模组。其中光伏电池片单元10的正面即是指受光面，反面即是指背光面。
反面互联导电带20为超薄超软材料，反面互联导电带20与光伏 电池片单元10的反面电极接合并导通。可选地，反面互联导电带20的表面涂覆涂锡层，或者反面互联导电带20的表面涂覆含有铅和/或银的可焊性涂锡层，涂锡层厚度为10um-30um。
可选地，反面互联导电带20为镀锡铜扁带，所述镀锡铜扁带包括铜基材和两层镀锡层，两层镀锡层分别分布于铜基材的两面，铜基材的厚度为0.02mm-0.1mm，铜基材的宽度为0.5mm-3.0mm。镀锡层的厚度为5um-35um。
可选地，反面互联导电带20是由镀锡的铜线编成的铜网带，铜线的直径为0.02mm-0.1mm，铜网带的厚度为0.05mm-0.2mm，铜网带的宽度为1mm-10mm。
每个反面互联导电带20的两端分别搭接于相邻的两个光伏电池片单元10，同一组的每个反面互联导电带20一一对应地覆盖同一个光伏电池片单元10的反面电极并延伸搭接于相邻的另一个光伏电池片单元10的正面电极。
正面互联导电带30与光伏电池片单元10的正面电极接合并导通。可选地，正面互联导电带30选自镀锡铜扁带、三角形焊带或圆形焊带中的一种。其中三角形焊带是指横截面为三角形的焊带，圆形焊带是指横截面为圆形的焊带。其中镀锡铜扁带可以为带有三角形花纹的铜扁带，也可以为普通不带三角形花纹的铜扁带。
优选地，正面互联导电带30采用三角形焊带，这样三角形焊带接合于光伏电池片单元10的正面电极上，不仅反光性能最佳，利于光伏电池片单元10对光的吸收率，而且三角形焊带的导电性能和工艺实施性能最佳。
可选地，正面互联导电带30的表面涂覆涂锡层，或者正面互联导电带30的表面涂覆含有铅和/或银的可焊性涂锡层，涂锡层厚度为10um-30um。
同一组的每个正面互联导电带30一一对应地覆盖同一个光伏电池片单元10的正面电极，每个正面互联导电带30的一端不超过光伏电池片单元10的边缘并和搭接于同一个正面电极的反面互联导电带20搭接导通。反面互联导电带20和正面互联导电带30搭接的长度为0.5mm-5mm。所有的光伏电池片单元10通过反面互联导电带20 和正面互联导电带30串联，从而组成所述光伏电池模组。相邻两个光伏电池片单元10的间距小于或等于0.5mm。
一般地，串联组成的所述光伏电池模组的长度是12-16片光伏电池片单元10的总长度，也就是说，所述光伏电池模组在长度方向上是由12-16片光伏电池片单元串联组成。但是所述光伏电池模组也可以是其他长度。在长度方向上成排串联后的光伏电池片单元10还可以进行再次串联排版布局，例如可以采用横版和竖版两种方式进行并联和层叠，将用于每块组件的所有串联成串的所述光伏电池模组连接成一个整体。
常规光伏电池片的尺寸以“长*宽”形式表示有156mm*156mm，156.75mm*156.75mm，157mm*157mm，160mm*157mm几种类型。常规光伏电池模组规格以“列数*排数”形式表示有6*10或6*12个上述光伏电池片串联排布而成。若将常规的156mm*156mm尺寸的光伏电池片对半切割，获得的光伏电池片单元10的尺寸为156mm*78mm，其他切割方式的光伏电池片单元10尺寸依次类推。
可选地，光伏电池片单元10排布成为6列21排、6列25排、10列12排、10列13排、10列14排、12列12排、12列13排、12列14排的形式中的一种；或者光伏电池片单元10排布成为2个区块，每个区块排成6列11排、6列12排、6列13排或者6列14排的形式中的一种。光伏电池片单元10排布方式有竖版布局和横版布局两种形式，例如，图7即为竖版布局形式，图8即为横版布局格式。具体地，若采用将常规光伏电池片对半切割获得的光伏电池片单元10串联，即将156mm*156mm尺寸的光伏电池片对半切割，获得的光伏电池片单元10的尺寸为156mm*78mm，那么竖版布局的规格以“列数*排数”或者“(列数*排数*区块数)”形式表示可以为6*21(列数*排数)、6*25、6*11*2(列数*排数*区块数)、6*12*2、6*13*2、6*14*2或其他形式中的一种。图7所示的即为6*13*2的规格。横版布局的规格可以为10*12、10*13、10*14、12*12、12*13、12*14或其他形式中的一种。图8所示的即为12*13规格。
优选地，横版布局的规格为10*13或12*13，竖版布局的规格为6*12*2、6*13*2、6*14*2或6*15*2中的一种。
而对于将常规光伏电池片进行三等分或四等分切割获得的光伏电池片单元10而言，横版布局和竖版布局的排版根据情况也可以为其他版型。可以理解的是，由于本发明的方案中，光伏电池片单元10的间距相比传统技术更小，因而对于同样一块常规尺寸的光伏电池模组而言，能够排布的光伏电池片单元10数量更多，允许排布的形式更加多样化，灵活性更好。
根据本发明的另一方面，本发明进一步提供第一种光伏电池模组的制备方法。所述光伏电池模组的制备方法包括以下步骤：
A、将多组正面互联导电带30等间距排布于平台上；
B、以一个光伏电池片单元10和一组反面互联导电带20的顺序依次轮流地在每一组正面互联导电带30上放置一个光伏电池片单元10和在每一个光伏电池片单元10上放置一组反面互联导电带20，使得每个光伏电池片单元10的正面电极一一对应地对准并覆盖同一组的每一个正面互联导电带30，而且正面互联导电带30的一端不超过光伏电池片单元10的边缘，相邻两个光伏电池片单元10的间距小于或等于0.5mm，反面互联导电带20一一对应地对准并覆盖光伏电池片单元10的反面电极，而且反面互联导电带20的一端延伸于光伏电池片单元10之外并和相邻一组的正面互联导电带30的一端一一对应地搭接导通，使得反面互联导电带20和正面互联导电带30的搭接位置不超过光伏电池片单元10的边缘。
具体地，图3具体展示了第一种根据上述制备方法具体制备所述光伏电池片模组的流程示意图。
其中，在所述步骤A中，选用三角形焊带作为正面互联导电带30。先将若干组正面互联导电带30在串焊机的焊接平台或者皮带的平台上等间距定位横向排布放置好。每一正面互联导电带30长度一致。每组正面互联导电带30的数量和间距与待串联的光伏电池片单元10的正面电极的数量和间距一致。
所述步骤B包括以下步骤：
B1、从第一组正面互联导电带30位置起，将第一个光伏电池片单元10放置于第一组正面互联导电带30的上方，并使得光伏电池片单元10的正面电极一一对应地和正面互联导电带30对准接合。此时 光伏电池片单元10呈正面朝下，反面朝上的状态并压着下方的正面互联导电带30。正面互联导电带30的一端定位在光伏电池片单元10上距离光伏电池片单元10的边缘1mm-10mm位置，而正面互联导电带30的另一端作为头部伸出光伏电池片单元10之外。
B2、在第一个光伏电池片单元10的反面电极上放置第一组反面互联导电带20，使得光伏电池片单元10的反面电极一一对应地和反面互联导电带20对准接合。此时反面互联导电带20位于光伏电池片单元10的上方并能覆盖住反面电极。反面互联导电带20的一端不要伸出光伏电池片单元10的边缘，反面互联导电带20的另一端延伸出光伏电池片单元10的边缘和相邻第二组正面互联导电带30的端部搭接。反面互联导电带20和正面互联导电带30搭接的长度为0.5mm-5mm。
B3、在第二组正面互联导电带30上放置第二个光伏电池片单元10，使光伏电池片单元10的正面电极和第二组正面互联导带30一一对应对准接合，并且第二组正面互联导电带30中和第一组反面互联导电带20搭接的一端不超过第二个光伏电池片单元10的边缘，这样正面互联导电带30和反面互联导电带20搭接的位置位于第二个光伏电池片单元10的正面上，而不是位于第一个光伏电池片单元10和第二个光伏电池片单元10之间。第二个光伏电池片单元10和第一个光伏电池片单元10的间距可以控制在小于或等于0.5mm范围内。
B4、按照B1、B2、B3顺序依次放置并接合其他的光伏电池片单元10、反面互联导电带20以及正面互联导电带30，直至放置完最后一个光伏电池片单元10。此时最后一组反面互联导电带20伸出最后一个光伏电池片单元10的边缘较长距离，作为尾部收尾。至此完成光伏电池片单元10的互联串焊。
可以理解的是，在所述步骤B中，一组正面互联导电带30上一一对应地放置一个光伏电池片单元10，每一个光伏电池片单元10上一一对应地放置一组反面互联导电带20。正面互联导电带30和反面互联导电带20搭接的一端不超过光伏电池片单元10的边缘，也就是说，正面互联导电带30的一端位于光伏电池片单元10正面范围内而不会延伸出光伏电池片单元10之外。事实上，除了第一组正面互联 导电带30没有和反面互联导电带20接合的一端延伸出光伏电池片单元10之外，其余所有的正面互联导电带30的两端均不超过光伏电池片单元10的边缘。这样可以保证正面互联导电带30和反面互联导电带20搭接位置始终处于光伏电池片单元10范围内，而无需占据相邻两片光伏电池片单元10之间的位置，从而相邻两片光伏电池片单元10可以挨得更紧，实现两者间距缩小至0.5mm范围内。
根据本发明的另一方面，本发明进一步提供第二种光伏电池模组的制备方法，包括以下步骤：
a、以一组反面互联导电带20和一个光伏电池片单元10的顺序依次轮流交替地将多组反面互联导电带20和多个光伏电池片单元10排布于平台上，使得每一个光伏电池片单元10的反面电极一一对应地对准并覆盖同一组的反面互联导电带20，而且反面互联导电带20的一端延伸至相邻的一个光伏电池片单元10的正面电极上，相邻两个光伏电池片单元10的间距小于或等于0.5mm；
b、在每一个光伏电池片单元10上放置一组正面互联导电带30，使得正面互联导电带30一一对应地对准并覆盖光伏电池片单元10的正面电极，而且正面互联导电带30的一端不超过光伏电池片单元10的边缘并和延伸至同一正面电极上的反面互联导电带20搭接导通。
具体地，图5具体展示了根据第二种制备方法具体制备所述光伏电池片模组的流程示意图。
其中，所述步骤a包括以下步骤：
a1、先在串焊机的串焊平台或皮带平台上等间距定位横向排布放置好第一组反面互联导电带20，然后在第一组反面互联导电带20上放置第一个光伏电池片单元10，并使得光伏电池片单元10的反面电极一一对应地和反面互联导电带20对准接合。此时，此时光伏电池片单元10呈反面朝下，正面朝上的状态并压着下方的反面互联导电带20。反面互联导电带20的一端不伸出光伏电池片单元10的边缘，反面互联导电带20的另一端作为头部伸出光伏电池片单元10的边缘之外5mm-10mm。每一反面互联导电带20长度一致。每组反面互联导电带20的数量和间距与光伏电池片单元10的反面电极的数量和间距一致。
a2、在第一个光伏电池片单元10的相邻位置放置第二组反面互联导电带20，使得反面互联导电带20的一端搭在第一个光伏电池片单元10的正面电极上，反面互联导电带20的另一端不超出光伏电池片单元10的边缘。其中第二组反面互联导电带20和第一个光伏电池片单元10的搭接长度为1mm-10mm。
a3、按照a1、a2的顺序依次放置接合其他的光伏电池片单元10和反面互联导电带20。直至放置最后一个光伏电池片单元10时，最后一组反面互联导电带20不要伸出光伏电池片单元10。
在所述步骤b中，在第一个光伏电池片单元10的正面电极上放置第一组正面互联导电带30，使得光伏电池片单元10的正面电极一一对应地和正面互联导电带30对准接合，正面互联导电带30的一端搭接第二组反面互联导电带20上。反面互联导电带20和正面互联导电带30搭接的长度为0.5mm-5mm。按照同样的方式依次在其他的光伏电池片单元10上放置并接合其他组的正面互联导电带30，直至放置完最后一个正面互联导电带30。此时最后一组正面互联导电带30的一端作为尾部伸出光伏电池片单元10之外5mm-10mm，至此完成光伏电池片单元10的互联串焊。
值得一提的是，所述步骤a3和所述步骤b的顺序不作限定。一种方式是；在完成步骤a2之后，即在第一个光伏电池片单元10的相邻位置放置第二组反面互联导电带20之后，可以先依次放置第二个光伏电池片单元10、第三组反面互联导电带20、第三个光伏电池片单元10…，再依次在第一个光伏电池片单元10上放置第一组正面互联导电带30，在第二个光伏电池片单元10上放置第二组正面互联导电带30，在第三个光伏电池片单元10上放置第三组正面互联导电带30…。另一种方式是：在完成步骤a2之后，即在第一个光伏电池片单元10的相邻位置放置第二组反面互联导电带20之后，先在第一个光伏电池片单元10上放置第一组正面互联导电带30，接着在第二组反面互联导电带20上放置第二个光伏电池片单元10，然后在第二个光伏电池片单元10上放置第三组反面互联导电带20，再在第二个光伏电池片单元10上放置第二组正面互联导电带30，依次类推进行下去。
上述第一种和第二种光伏电池模组的制备方法中，正面互联导电带30都可以为镀锡铜扁焊带、三角形焊带、圆形焊带或其他结构的焊带中的一种。光伏电池片单元10、反面互联导电带20以及正面互联导电带30三者通过高温焊接过程来最终固定，但是对于特定地某些不能经过高温的产品，也可以用低温粘接导电胶的方式来实现固定和电学导通。
本发明利用反面互联导电带20的超薄超软特性，将正面互联导电带30和反面互联导电带20的搭接串焊位置从相邻两个光伏电池片单元10的之间的外部间隙处改至光伏电池片单元10的正面内部，同时将光伏电池片单元10间距大幅压缩至0.5mm以内而不会造成光伏电池片单元10碎裂，更加高效地利用了光伏电池模组的正面受光面积，并且正面互联导电带也可以利用像三角形焊带这种对光吸收率更高的焊带，从而达到了提高光伏电池模组发电效率、降低光伏电池模组单位成本的目标。此外，超薄越软的反面互联导电带20允许搭配多种不同的正面互联导电带，从而提高了工艺或机器本身的适用性。本发明优选地适用于常规光伏电池片进行二等分、三等分或四等分切割后的光伏电池片单元10之间的串焊，考虑到产能、成本、功率等综合因素，最佳适用于对常规光伏电池片进行二等分切割后的光伏电池片单元10互联串焊。
鉴于上述几种优势本发明可以用于制备以下几种典型的不同搭配的横版的光伏电池片模组：
1、常规单晶/多晶P型单面发电电池，正面电极6根以上(含6根)的多主栅设计，优选地采用三角形焊带作为正面互联导电带30，同时为了便于三角形焊带的定位，串焊时采用上述第一种光伏电池模组制备方法，即光伏电池片单元10正面朝下的方案。采用超薄的镀锡铜扁带作为反面互联导电带30，厚度为0.08mm，宽度为2mm。制备后的光伏电池模组由10或12串横向摆放的成串的光伏电池片单元10组成，每串含有13片光伏电池片单元10，如图8所示。
2、常规单晶/多晶P型单面电池，正面电极3-5根的普通主栅设计，优选地采常规的扁焊带作为正面互联导电带30。串焊时上述第一种(即光伏电池片单元10正面朝下的方案)和第二种(即光伏电 池片单元10正面朝上的方案)光伏电池模组制备方法都可以采用。另外，正面互联导电带可以用三角形焊带，但是如果用三角形焊带，那么串焊时就必须采用第一种光伏电池模组制备方法。采用常规的扁焊带作为反面互联导电带20，对于5栅的光伏电池片单元10，反面互联导电带20一般采用1.0mm*0.2mm的尺寸；对于4栅光伏电池片单元10，反面互联导电带20一般采用1.2mm*0.2mm的尺寸。制备后的光伏电池模组由10或12串横向摆放的成串的光伏电池片单元10组成，每串含13片光伏电池片单元10，如图8所示。
3、单晶N型/P型双面发电电池，由于双面发电电池比单面发电电池更容易碎裂，所以在常规3-5根正面电极或6根以上的多主栅设计中，优选地正面互联导电带30都采用常规的扁焊带。串焊时第一种和第二种光伏电池模组制备方法都可以适用。但若采用三角形焊带作为正面互联导电带，当三角形焊带的横截面边长尺寸降至0.5mm以下，可优选地将三角形焊带用于多主栅设计的双面发电电池的互联串焊中，但是此时就仅能采用第一种光伏电池模组制备方法，即光伏电池片单元10正面朝下的方案。制备后的光伏电池模组由10或12串横向摆放的成串的光伏电池片单元10组成，每串含13片光伏电池片单元10，如图8所示。
本发明也可以用于制备不同搭配的竖版的光伏电池片模组，与上述横版的3种典型应用一样，只是在竖版中，制备后的光伏电池模组由分成上下两组对称排布光伏电池片单元10组成，每组由12串竖向摆放的成串的光伏电池片单元10组成，每串包含13或15片光伏电池片单元10，如图7所示。
以下三个实施例是其中三种具体的光伏电池模组版型特点、正面互联导电带30和反面互联导电带20的特点，以及完整的制备过程。
实施例一：单多晶单面或双面电池+三角焊带+横版
1、光伏电池片单元10的准备：单晶或多晶P型单面或双面发电电池，由156.75*156.75的标准尺寸光伏电池片对半切成二等分小片。正面电极7根，宽度为0.3mm，正面电极间距为22.1mm，反面电极分两段。
2、正面互联导电带30和反面互联导电带20的准备：采用 0.08mm*2mm的超薄的镀锡铜扁带作为反面互联导电带20，镀锡铜扁带的单边镀锡层厚度为0.015mm。采用镀锡的三角形焊带作为正面互联导电带，横截面边长为0.5mm，镀锡层厚度为0.015mm。
3、其他物料如汇流条、玻璃、背板、EVA(或POE)、铝边框、接线盒等材料及后续的层压测试等过程与常规工艺一样。
4、采用第一种光伏电池模组制备方法，即光伏电池片单元10正面朝下的方案将13片光伏电池片单元10先串联成串，头尾的正面互联导电带30和反面互联导电带20预留长度为8mm。
5、取12串上述成串的光伏电池片单元10再进行串联或并联，以形成如图8所示导通的电池阵列，再按照常规工艺进行叠层，将成串的光伏电池片单元10、玻璃、背板、EVA依次摆放好，经EL检测无误后进行层压工艺，之后再进行装框、装接线盒、测试等工序完成一块光伏电池模组的制备。
实施例二：单多晶单面或双面电池+三角焊带+竖版
1、光伏电池片单元10的准备：单晶或多晶P型单面或双面发电电池，由156.75mm*156.75mm的标准尺寸光伏电池片对半切成二等分小片。正面电极7根，宽度为0.3mm，正面电极间距为22.1mm，反面电极分两段。
2、正面互联导电带30和反面互联导电带20的准备：采用0.08mm*2mm的超薄的镀锡铜扁带作为反面互联导电带20，镀锡铜扁带的单边镀锡层厚度为0.015mm。采用镀锡的三角形焊带作为正面互联导电带，横截面边长为0.5mm，镀锡层厚度为0.015mm。
3、其他物料如汇流条、玻璃、背板、EVA(或POE)、铝边框、接线盒等材料及后续的层压测试等过程与常规工艺一样。
4、采用第一种光伏电池模组制备方法，即光伏电池片单元10正面朝下的方案将13片光伏电池片单元10先串联成串，头尾的正面互联导电带30和反面互联导电带20预留长度为8mm。
5、取12串上述成串的光伏电池片单元10再进行串联或并联，以形成如图7所示导通的电池阵列，再按照常规工艺进行叠层，将成串的光伏电池片单元10、玻璃、背板、EVA依次摆放好，经EL检测无误后进行层压工艺，之后再进行装框、装接线盒、测试等工序完成 一块光伏电池模组的制备。
实施例三：单多晶单面或双面电池+扁焊带+横版
1、光伏电池片单元10的准备：单晶或多晶单面或双面发电电池，由156.75*156.75的标准尺寸光伏电池片对半切成二等分小片，正面电极5根，宽度为1.0mm，反面电极分两段。
2、正面互联导电带30和反面互联导电带20的准备：采用0.08mm*2mm的超薄的镀锡铜扁带作为反面互联导电带20，镀锡铜扁带的单边镀锡层厚度为0.015mm。采用常规扁焊带作为正面互联导电带30，尺寸为1.0mm*0.2mm。
3、其他物料如汇流条、玻璃、背板、EVA(或POE)、铝边框、接线盒等材料及后续的层压测试等过程与常规组件的都一样。
4、采用第一种光伏电池模组制备方法，即光伏电池片单元10正面朝下的方案将13片光伏电池片单元10先串联成串，头尾的正面互联导电带30和反面互联导电带20预留长度为8mm。
5、取12串上述成串的光伏电池片单元10再进行串联或并联，以形成如图8所示导通的电池阵列，再按照常规工艺进行叠层，将成串的光伏电池片单元10、玻璃、背板、EVA依次摆放好，经EL检测无误后进行层压工艺，之后再进行装框、装接线盒、测试等工序完成一块光伏电池模组的制备。
实施例四：单多晶单面或双面电池+扁焊带+竖版
1、光伏电池片单元10的准备：单晶或多晶单面或双面发电电池，由156.75*156.75的标准尺寸光伏电池片对半切成二等分小片。正面电极5根，宽度为1.0mm，反面电极分两段。
2、正面互联导电带30和反面互联导电带20的准备：采用0.08mm*2mm的超薄的镀锡铜扁带作为反面互联导电带20，镀锡铜扁带的单边镀锡层厚度为0.015mm。采用常规扁焊带作为正面互联导电带30，尺寸为1.0mm*0.2mm。
3、其他物料如汇流条、玻璃、背板、EVA(或POE)、铝边框、接线盒等材料及后续的层压测试等过程与常规组件的都一样。
4、采用第一种光伏电池模组制备方法，即光伏电池片单元10正面朝下的方案将13片(分别对应常规60片型的光伏电池模组)或 15片(分别对应常规72片型的光伏电池模组)光伏电池片单元10先串联成串，头尾的正面互联导电带30和反面互联导电带20预留长度为8mm。
5、取12串上述成串的光伏电池片单元10再进行串联或并联，以形成如图7所示导通的电池阵列，再按照常规组件的方案进行叠层，将电池串、玻璃、背板、EVA依次摆放好，经EL检测无误后进行层压工艺，之后再进行装框、装接线盒、测试等工序完成一块光伏电池模组的制备。
本领域技术人员应当理解，上述描述以及附图中所示的本实用新型的实施例只作为举例，并不限制本实用新型。本实用新型的目的已经完整并有效地实现。本实用新型的功能和结构原理已在实施例中展示和说明，在没有背离所述原理情况下，本实用新型的实施方式可以有任何变形和修改。

Claims (11)

  1. 一种光伏电池模组，其特征在于，包括：
    多个光伏电池片单元，每个所述光伏电池片单元具有多个正面电极和多个反面电极；
    多组反面互联导电带，每个所述反面互联导电带的两端分别搭接于相邻的两个所述光伏电池片单元，同一组的每个所述反面互联导电带一一对应地覆盖同一个所述光伏电池片单元的反面电极并延伸搭接于相邻的另一个所述光伏电池片单元的正面电极；
    多组正面互联导电带，同一组的每个所述正面互联导电带一一对应地覆盖同一个所述光伏电池片单元的正面电极，每个所述正面互联导电带的一端不超过所述光伏电池片单元的边缘并和搭接于同一个正面电极的所述反面互联导电带搭接导通，所有的所述光伏电池片单元通过所述反面互联导电带和所述正面互联导电带串联，相邻两个所述光伏电池片单元的间距小于或等于0.5mm。
  2. 根据权利要求1所述的光伏电池模组，其特征在于，所述反面互联导电带为镀锡铜扁带，所述镀锡铜扁带包括铜基材和两层镀锡层，两层所述镀锡层分别分布于所述铜基材的两面，所述铜基材的厚度为0.02mm-0.1mm，所述镀锡层的厚度为5um-35um。
  3. 根据权利要求1所述的光伏电池模组，其特征在于，所述反面互联导电带是由镀锡的铜线编成的铜网带，所述铜线的直径为0.02mm-0.1mm，所述铜网带的厚度为0.05mm-0.2mm。
  4. 根据权利要求1所述的光伏电池模组，其特征在于，所述正面互联导电带选自镀锡铜扁带、三角形焊带或圆形焊带中的一种。
  5. 根据权利要求1所述的光伏电池模组，其特征在于，所述正面互联导电带和所述反面互联导电带的表面均涂覆涂锡层。
  6. 根据权利要求1所述的光伏电池模组，其特征在于，所述反面互联导电带和所述正面互联导电带搭接的长度为0.5mm-5mm。
  7. 根据权利要求1所述的光伏电池模组，其特征在于，所述光伏电池片单元排布成为6列21排、6列25排、10列12排、10列13排、10列14排、12列12排、12列13排、12列14排的形式中的一种；或者所述光伏电池片单元排布成为2个区块，每个区块排成6列11排、6列12排、6列13排或者6列14排的形式中的一种。
  8. 一种光伏电池模组的制备方法，其特征在于，包括以下步骤：
    A、将多组正面互联导电带等间距排布于平台上；
    B、以一个光伏电池片单元和一组反面互联导电带的顺序依次轮流地在每一组所述正面互联导电带上放置一个所述光伏电池片单元和在每一个所述光伏电池片单元上放置一组所述反面互联导电带，使得每个光伏电池片单元的正面电极一一对应地对准并覆盖同一组的每一个所述正面互联导电带，而且所述正面互联导电带的一端不超过所述光伏电池片单元的边缘，相邻两个所述光伏电池片单元的间距小于或等于0.5mm，所述反面互联导电带一一对应地对准并覆盖所述光伏电池片单元的反面电极，而且所述反面互联导电带的一端延伸于所述光伏电池片单元之外并和相邻一组的所述正面互联导电带的一端一一对应地搭接导通，使得所述反面互联导电带和所述正面互联导电带的搭接位置不超过所述光伏电池片单元的边缘。
  9. 根据权利要求8所述的光伏电池模组的制备方法，其特征在于，所述反面互联导电带和所述正面互联导电带搭接的长度为0.5mm-5mm。
  10. 一种光伏电池模组的制备方法，其特征在于，包括以下步骤：
    a、以一组反面互联导电带和一个光伏电池片单元的顺序依次轮流交替地将多组反面互联导电带和多个所述光伏电池片单元排布于平台上，使得每一个所述光伏电池片单元的反面电极一一对应地对准并覆盖同一组的所述反面互联导电带，而且所述反面互联导电带的一端延伸至相邻的一个所述光伏电池片单元的正面电极上，相邻两个所述光伏电池片单元的间距小于或等于0.5mm；
    b、在每一个所述光伏电池片单元上放置一组正面互联导电带，使得所述正面互联导电带一一对应地对准并覆盖所述光伏电池片单元的正面电极，而且所述正面互联导电带的一端不超过所述光伏电池片单元的边缘并和延伸至同一正面电极上的所述反面互联导电带搭接导通。
  11. 据权利要求10述的光伏电池模组的制备方法，其特征在于，所述反面互联导电带和所述正面互联导电带搭接的长度为0.5mm-5mm。
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