WO2014173331A1 - Welding strip for solar battery and solar battery assembly - Google Patents

Welding strip for solar battery and solar battery assembly Download PDF

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Publication number
WO2014173331A1
WO2014173331A1 PCT/CN2014/076417 CN2014076417W WO2014173331A1 WO 2014173331 A1 WO2014173331 A1 WO 2014173331A1 CN 2014076417 W CN2014076417 W CN 2014076417W WO 2014173331 A1 WO2014173331 A1 WO 2014173331A1
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WIPO (PCT)
Prior art keywords
strip
welding
notch
segment
welding strip
Prior art date
Application number
PCT/CN2014/076417
Other languages
French (fr)
Inventor
Zhanfeng Jiang
Shengya Wang
Xiang Sun
Juan HU
Shuili FANG
Junchao CAO
Original Assignee
Shenzhen Byd Auto R&D Company Limited
Byd Company Limited
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.)
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Application filed by Shenzhen Byd Auto R&D Company Limited, Byd Company Limited filed Critical Shenzhen Byd Auto R&D Company Limited
Publication of WO2014173331A1 publication Critical patent/WO2014173331A1/en

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
    • H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
    • H01L31/042—PV modules or arrays of single PV cells
    • H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
    • H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
    • H01L31/0508—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module the interconnection means having a particular shape
    • 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

  • Exemplary embodiments of the present disclosure generally relate to a field of solar battery, and more particularly to a welding strip for solar battery and a solar battery assembly including the welding strip.
  • a single crystal silicon solar cell tends to break and is low in power generation.
  • a plurality of solar cells are connected and packaged to form an assembly.
  • a plurality of solar cells are connected to form a battery pack, then a plurality of battery packs are arranged into an array, in which the solar cells in the same row are connected in series and the solar cells in different rows are connected in parallel.
  • a back electrode of one of the solar cells is connected with a front electrode of an adjacent solar cell by means of a thin welding strip.
  • the welding strip's width gradually changes with a variety of a current density on the front surface of the solar battery assembly, the welding strip's width increases with an increase of the current density, and decreases with a decrease of the current density.
  • the width of the welding strip on the front surface becomes smaller gradually, and the welding area is an isosceles triangle, a right triangle or an isosceles trapezoid in shape.
  • the width of the welding strip electrically connected with a back electrode is equal to that of the widest portion of the welding strip electrically connected with a front electrode, which is a rectangle in shape, as shown in Fig. 1.
  • the high welding temperature area of a back surface of a solar cell is much larger than that of a front surface of a solar cell.
  • a solar cell is connected with a welding strip by welding under a high temperature, and cooled to the ambient temperature.
  • the size of the front surface is different from that of the back surface after welding, and the heat-expansion and cold-contraction coefficient of the copper substrate welding strip is different from that of the silicon, therefore a stress is generated.
  • Two ends of the solar cell bend towards the back surface, and the middle portion of the solar cell hunches towards the front surface, therefore the solar cell becomes friable and tends to break during the process of laying and lamination, so that the performance and the electrical property of the solar assembly decreases.
  • the welding strip for solar battery includes: a first strip segment defining a first surface and a second surface opposed to each other in a width direction of the first strip segment, wherein the first strip segment includes an arc section and a connection section connected to the arc section in a length direction of the first strip segment, and at least one notch is formed in at least one of the first and second surfaces.
  • the arc section and the connection section are formed integrally.
  • the notch is formed in each of the first and second surfaces, and the notch formed in the first surface and the notch formed in the second surface are staggerly arranged with respect to each other.
  • the notch is formed in at least one of a first surface and a second surface of the connection section.
  • the incision notch comprises at least one of rectangle, triangle, round or and trapezoid in shape.
  • a depth of the notch is from 0.5 mm to 1.5 mm in the width direction of the first strip segment.
  • the notch penetrates through the first strip segment in a thickness direction of the first strip segment.
  • a radius of curvature of the arc section is from 2.2 mm to 14.81 mm.
  • the welding strip further includes a second strip segment connected to an end of the first strip segment, wherein a width of the second strip segment is decreased gradually along a direction away from the first strip segment.
  • the first and second strip segments are formed integrally.
  • a radius of curvature of the arc protrusion ranges from 2.2 mm to 14.81 mm.
  • the welding strip further includes a second region of the welding strip, and the second region's width gradually decreases from one end connected with the first region of the welding strip to the other end of the second region of the welding strip.
  • the first region of the welding strip and the second region of the welding strip are integrally formed.
  • the solar battery assembly includes: a plurality of solar cells, each of the solar cells defining a front surface and a back surface; a plurality of welding strips configured to connect the plurality of solar cells with each other.
  • each solar cell includes a front electrode disposed on the front surface and a back electrode disposed on the back surface
  • the first strip segment of the welding strip is connected to a back electrode of a first solar cell of the plurality of the solar cells
  • the second strip segment of the welding strip is connected to a front electrode of a second solar cell of the plurality of the solar cells located at a downstream of the first solar cell.
  • a position of the notch is corresponding to a position of the back electrode.
  • a position of the notch is located between the back electrodes adjacent to each other.
  • Fig. 1 is a schematic view of a welding strip for solar battery in the related art
  • Fig. 2 is a perspective view of a portion of a first strip segment according to an embodiment of the present disclosure
  • Fig. 3 is a partial enlarged view of Circle A in Fig. 1;
  • Fig. 4 is a top view of a first strip segment according to an embodiment of the present disclosure.
  • Fig. 5 is a cross-sectional view of a first strip segment according to an embodiment of the present disclosure
  • Fig. 6 is a top view of a first strip segment according to some embodiments of the present disclosure.
  • Fig. 7 is a top view of a first strip segment according to some embodiments of the present disclosure.
  • Fig. 8 is a top view of a first strip segment according to some embodiments of the present disclosure.
  • Fig. 9 is a top view of a first strip segment according to some embodiments of the present disclosure.
  • Fig. 10 is a top view of a first strip segment according to some embodiments of the present disclosure.
  • Fig. 11 is a top view of the whole welding strip according to some embodiments of the present disclosure.
  • Fig. 12 is a schematic view of back electric field of the solar cell according to an embodiment of the present disclosure.
  • Fig. 13 is a schematic view of front electric field of the solar cell according to an embodiment of the present disclosure.
  • the welding strip for solar battery includes a first strip segment 1.
  • the first strip segment 1 includes an arc section 11 and a connection section 12 connected to the arc section 11 in a length direction (the right and left direction in Fig. 2) of the first strip segment 1.
  • the first strip segment 1 has a first surface 13 and a second surface 14 opposed to each other in a width direction (the up and down direction in Fig. 4) of the first strip segment 1.
  • the arc section 11 and the connection section 12 may be formed integrally.
  • at least one notch 15 is formed in at least one of the first and second surfaces 13 and 14, in other words, at least one notch 15 may be formed in the first surface 13 or the second surface 14, or both of the first surface 13 and the second surface 14.
  • the arc section 11 and the connection section 12 are disposed alternatively in the length direction, and the arc section 11 is formed by a pre-bending treatment.
  • the first strip segment 1 may include a plurality of the arc sections 11 and a plurality of the connection sections 12.
  • the connection section 12 may be a straight flat portion.
  • the notches 15 are formed in both of the first surface 13 and the second surface 14, and the notch 15 formed in the first surface 13 and the notch 15 formed in the second surface 14 are staggerly arranged with respect to each other, in other words, the notches 15 in the first surface 13 and the second surface 14 are not aligned with each other in the width direction. In other embodiments, as shown in Fig. 10, the notches 15 in the first surface 13 and the second surface 14 are aligned to each other in the width direction.
  • the notches 15 may be formed in at least one of the first and second surfaces of the connection section 12, alternatively, the notches 15 may be formed in at least one of the first and second surfaces of the arc section 11 as well.
  • the notch 15 may have at least one of rectangle, triangle, arcuate and trapezoid shape.
  • a radius of curvature of the arc section 11 is from 2.2 mm to 14.81 mm, particularly from 5 mm to 12 mm.
  • a depth of the notch 15 is from 0.5 mm to 1.5 mm in the width direction of the first strip segment 1, and the notch 15 penetrates through the first strip segment 1 in a thickness direction of the first strip segment 1.
  • the welding strip further includes a second strip segment 2 connected to an end of the first strip segment 1, and the width of the second strip segment 2 is decreased gradually along a direction away from the first strip segment 1.
  • the first and second strip segments 1, 2 may be formed integrally.
  • the solar battery assembly includes a plurality of solar cells and a plurality of welding strips.
  • Each of the solar cells has a front surface and a back surface.
  • the welding strips are configured to connect the plurality of solar cells with each other and/or connect the solar cell with a load.
  • a front electrode 4 is disposed on the front surface of the solar cell and a back electrode 3 is disposed on the back surface of the solar cell.
  • the first strip segment 1 of the welding strip is connected to a back electrode 3 of a first solar cell of the plurality of the solar cells
  • the second strip segment 2 of the welding strip is connected to a front electrode 4 of a second solar cell of the plurality of the solar cells adjacent to and located at a downstream of the first solar cell.
  • a position of the notch 15 may be corresponding to a position of the back electrode 3.
  • a position of the notch 15 is located between the back electrodes 3 of adjacent solar cells.
  • a size of each segments of the back electrode was 24.5mmx3mm.
  • the basis material of the conductive strip used in this embodiment was a tin-coated strip with a size of 0.2mm (thickness) x2.5mm (width), in which the copper was 0.18 mm, and the tinned layer was 0.02 mm.
  • the tin-coated strip was cut into welding strips each with a length of 330 mm, then the welding strip was cut with a length of 300 mm by a cutting device.
  • the welding strip was obliquely cut at a position of 145 mm away from the first end, a width of the first end of the welding strip was 0.5 mm, and a width of the welding strip at the position of 145 mm was 2.5mm, so that a second strip segment 2 with a width varying from 0.5 mm to 2.5 mm and a length of 145 mm was provided, and an unfinished first strip segment from a second end of the welding strip to the position of 145 mm was also provided.
  • the welding strip connects the polycrystalline cells in series so as to form a cell string, the cell string was disposed on the EVA (Ethylene Vinyl Acetate )of the glass, then spaces between the cell strings were set by fixing the cell strings with high temperature adhesive tapes, and the cell strings were connected in series with a bus bar, then the connected cell strings were covered with EVA and TPE plate, and laminated in a laminating machine after testing hidden crack via EL(Electro Luminescence) test .
  • the redundant EVA and TPE plate of the laminated product may be cut off, a frame was assembled, and a junction box was connected, so that a solar battery assembly was obtained after curing and cleaning.
  • a front electrode refers to an electrode (usually, a negative electrode) on a front (light receiving) surface for leading a current out.
  • the front electrode was usually achieved by welding the second strip segment with 60 pieces of polycrystalline cells each with three main grid lines on a single-type welding heating station using an electric soldering iron.
  • the solar cell with a welding strip welded on the front surface was placed on a series welding mold of a series welding heating station, with the front surface facing downward, and the first strip segments were respectively placed on the back (light shielding) surface of the solar cells.
  • a back electrode refers to an electrode (usually, a positive electrode) on the back surface for leading a current out. The back electrode was usually obtained by welding the adjacent pieces of the electrode and the corresponding first strip segment with an electric soldering iron.
  • a P6-30 toughened glass plate was disposed on a laying table, the EVA was disposed on the toughened glass plate, in which the EVA has a size bigger than that of the toughened glass plate, the front surface faces downward, and the cell strings were disposed on EVA at a predetermined space, and fixed with 3M high temperature adhesives.
  • the cell strings were connected in series with a tin-coated bus bar having a size of
  • the bus bars at the positive and negative terminals were L-shaped.
  • the EVA and TPE back plates were covered on the series cell string. A cut with a length of 95mm was formed from the central position of the leading-out end toward to both sides. A space between a cut and an edge of an end of the back plate was about 70mm, so that the leading-out ends of the positive electrode and the negative electrode of the bus bar extended out through the cut.
  • a solar assembly laminated product was obtained by testing crack with an EL tester, laminating, cooling the laminated piece, and cutting off the redundant EVA and TPE plates of the laminated piece.
  • the above assembly was installed into an aluminum frame, then the frame was connected with the back plate and connections between the frame and the back plate was filled with sealant uniformly.
  • the sealant was also filled in the cuts of the TPE back plate of the leading-out ends of the positive electrode and the negative electrode of the bus bar.
  • the sealant was also filled in the specified position of junction box.
  • the un-cured assembly was placed in the curving apparatus, with a temperature of 25 ° C + 2 ° C and a humidness of 70% ⁇ 10%), for more than four hours.
  • the cured assembly was disposed on a cleaning device to clean a leftover adhesive and dirt, and the leading-out ends of the positive electrode and the negative electrode of the bus bar were connected to the junction box before closing the cover of the junction box.
  • the positive electrode and the negative electrode were connected to the junction box to form a final solar battery assembly Al .
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1.
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that: three triangular notches were formed in one side of the welding strip, at positions of 20.5mm ⁇ 36.5mm, 57.5mm ⁇ 73.5mm, and 94.5mm ⁇ l 10.5mm away from the second end of the welding strip, with depth ranging from 0 mm to 1mm. In the meantime, three arc sections with radius of curvature of 6mm were formed. Therefore, a final solar battery assembly A3 was formed.
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, three circular arc notches were formed in one side of the welding strip, at positions of 20.5mm ⁇ 36.5mm, 57.5mm ⁇ 73.5mm, and 94.5mm ⁇ l 10.5mm away from the second end of the welding strip, with depth ranging from 0 mm to 1mm, and then from 1mm to 0mm. In the meantime, three arc sections with radius of curvature of 14.84mm were formed. Therefore, a final solar battery assembly A4 was formed. EMBODIMENT 5
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, two notches were formed in one side of the welding strip, at positions of 20.5mm ⁇ 36.5mm and 94.5mm ⁇ l 10.5mm away from the second end of the welding strip, and another notch was formed in the other side at positions of 57.5mm ⁇ 73.5mm away from the second end of the welding strip, with depth of 1mm. In the meantime, three arc sections with radius of curvature of 2.2mm were formed. Therefore, a final solar battery assembly A5 was formed. EMBODIMENT 6
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, three notches were formed in one side of the welding strip, at positions of 20.5mm ⁇ 36.5mm, 57.5mm ⁇ 73.5mm and 94.5mm ⁇ l 10.5mm away from the second end of the welding strip, and another notch was formed in the other side at 57.5mm ⁇ 73.5mm away from the second end of the welding strip, with depth of 0.5mm, and then from 1mm to 0mm. In the meantime, the four arc sections with radius of curvature of 12mm were formed. Therefore, a final solar battery assembly A6 was formed.
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1.
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, the position of the notch of the first strip was corresponding to that of the back electrode of the solar cell, and the radius of curvature of the arc section was 13mm. Therefore, a final solar battery assembly A8 was formed.
  • EMBODIMENT 9 The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, the notch was 1.5mm in depth, and the radius of curvature of the arc section was 5mm. Therefore, a final solar battery assembly A9 was formed. EMBODIMENT 10
  • the battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, the notch was 0.5mm in depth, and the radius of curvature of the arc section was 8mm. Therefore, a final solar battery assembly A10 was formed. COMPARING EXAMPLE
  • a size of each segments of the back electrode was 24.5mmx3mm.
  • the basis material of the conductive strip used in this embodiment was a tin-coated strip with a size of 0.2mm (thickness) x2.5mm (width), in which the copper was 0.18 mm, and the tinned layer was 0.02 mm.
  • the tin-coated strip was cut into welding strip with a length of 330 mm, then the welding strip was cut with a length of 300 mm by a cutting device.
  • a conventional welding strip was provided, with a length of 155 mm, and a segment of the welding strip has an isosceles trapezoid shape having a width gradually increasing from 0.5 mm to 2.5 mm.
  • Another segment of the welding strip has a rectangle shape with size of 145mmx2.5mm.
  • 60 pieces of polycrystalline cells are connected with the welding strip, the segment of the welding strip having varying width is welded on the front surface of the cells on a single-type welding heating station using an electric soldering iron.
  • the solar cell with a welding strip welded on the front surface was placed on a series welding mold of a series welding heating station, with the front surface facing downward, and the segment of the welding strip having constant width was placed on the back surface of the cells.
  • Ten solar cells are arranged, adjacent pieces of the electrode on the back surface are welded an electric soldering iron.
  • a toughened glass plate was provided on an operation station; a first binding agent layer EVA was formed on the toughened glass plate; the cell string was arranged on the binding agent layer; a second binding agent layer was formed on the cell string; a backing plate was formed on the second binding agent layer; the above layers were laminated in an laminating machine to form the solar battery assembly. Then the solar battery assembly was assembled with frame, and the positive electrode and the negative electrode were connected to the junction box to form a solar battery assembly CA1.
  • the solar battery assemblies according to EMBODIMENTS 1-10 and COMPARING EXAMPLE were tested under a same ambient temperature respectively, by using a solar battery assembly test apparatus with a hidden crack tester. Results were list in Table 1.

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Abstract

A welding strip for solar battery and a solar battery assembly are provided. A welding strip for solar battery includes a first strip segment (1) defining a first surface (13) and a second surface (14) opposed to each other in a width direction of the first strip segment (1), wherein the first strip segment (1) includes an arc section (11) and a connection section (12) connected to the arc section (11) in a length direction of the first strip segment (1), and at least one notch (15) is formed in at least one of the first and second surf aces (13, 14).

Description

WELDING STRIP FOR SOLAR BATTERY AND SOLAR BATTERY ASSEMBLY
CROSS-REFERENCE TO RELATED APPLICATION
This application claims priority to, and benefits of Chinese Patent Application No. 201320221496.6, filed with the State Intellectual Property Office of China on April 27, 2013, the entire content of which is incorporated herein by reference.
FIELD
Exemplary embodiments of the present disclosure generally relate to a field of solar battery, and more particularly to a welding strip for solar battery and a solar battery assembly including the welding strip.
BACKGROUND
Since a single crystal silicon solar cell (solar panel) tends to break and is low in power generation. In practice, a plurality of solar cells are connected and packaged to form an assembly. For example, a plurality of solar cells are connected to form a battery pack, then a plurality of battery packs are arranged into an array, in which the solar cells in the same row are connected in series and the solar cells in different rows are connected in parallel. For the serial connection, a back electrode of one of the solar cells is connected with a front electrode of an adjacent solar cell by means of a thin welding strip.
The welding strip's width gradually changes with a variety of a current density on the front surface of the solar battery assembly, the welding strip's width increases with an increase of the current density, and decreases with a decrease of the current density. The width of the welding strip on the front surface becomes smaller gradually, and the welding area is an isosceles triangle, a right triangle or an isosceles trapezoid in shape. The width of the welding strip electrically connected with a back electrode is equal to that of the widest portion of the welding strip electrically connected with a front electrode, which is a rectangle in shape, as shown in Fig. 1.
The high welding temperature area of a back surface of a solar cell is much larger than that of a front surface of a solar cell. A solar cell is connected with a welding strip by welding under a high temperature, and cooled to the ambient temperature. The size of the front surface is different from that of the back surface after welding, and the heat-expansion and cold-contraction coefficient of the copper substrate welding strip is different from that of the silicon, therefore a stress is generated. Two ends of the solar cell bend towards the back surface, and the middle portion of the solar cell hunches towards the front surface, therefore the solar cell becomes friable and tends to break during the process of laying and lamination, so that the performance and the electrical property of the solar assembly decreases.
SUMMARY
The welding strip for solar battery according to embodiments of the present disclosure includes: a first strip segment defining a first surface and a second surface opposed to each other in a width direction of the first strip segment, wherein the first strip segment includes an arc section and a connection section connected to the arc section in a length direction of the first strip segment, and at least one notch is formed in at least one of the first and second surfaces.
In some embodiments, the arc section and the connection section are formed integrally.
In some embodiments, the notch is formed in each of the first and second surfaces, and the notch formed in the first surface and the notch formed in the second surface are staggerly arranged with respect to each other.
In some embodiments, the notch is formed in at least one of a first surface and a second surface of the connection section.
In some embodiments, the incision notch comprises at least one of rectangle, triangle, round or and trapezoid in shape.
In some embodiments, a depth of the notch is from 0.5 mm to 1.5 mm in the width direction of the first strip segment.
In some embodiments, the notch penetrates through the first strip segment in a thickness direction of the first strip segment.
In some embodiments, a radius of curvature of the arc section is from 2.2 mm to 14.81 mm. In some embodiments, the welding strip further includes a second strip segment connected to an end of the first strip segment, wherein a width of the second strip segment is decreased gradually along a direction away from the first strip segment.
In some embodiments, the first and second strip segments are formed integrally.
In some embodiments, a radius of curvature of the arc protrusion ranges from 2.2 mm to 14.81 mm.
In some embodiments, the welding strip further includes a second region of the welding strip, and the second region's width gradually decreases from one end connected with the first region of the welding strip to the other end of the second region of the welding strip.
In some embodiments, the first region of the welding strip and the second region of the welding strip are integrally formed.
The solar battery assembly according to embodiments of the present disclosure includes: a plurality of solar cells, each of the solar cells defining a front surface and a back surface; a plurality of welding strips configured to connect the plurality of solar cells with each other.
In some embodiments, each solar cell includes a front electrode disposed on the front surface and a back electrode disposed on the back surface, the first strip segment of the welding strip is connected to a back electrode of a first solar cell of the plurality of the solar cells, and the second strip segment of the welding strip is connected to a front electrode of a second solar cell of the plurality of the solar cells located at a downstream of the first solar cell.
In some embodiments, a position of the notch is corresponding to a position of the back electrode.
In some embodiments, a position of the notch is located between the back electrodes adjacent to each other.
Additional aspects and advantages of embodiments of present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS
These and other aspects and advantages of embodiments of the present disclosure will become apparent and more readily appreciated from the following descriptions made with reference to the drawings, in which:
Fig. 1 is a schematic view of a welding strip for solar battery in the related art;
Fig. 2 is a perspective view of a portion of a first strip segment according to an embodiment of the present disclosure;
Fig. 3 is a partial enlarged view of Circle A in Fig. 1;
Fig. 4 is a top view of a first strip segment according to an embodiment of the present disclosure;
Fig. 5 is a cross-sectional view of a first strip segment according to an embodiment of the present disclosure;
Fig. 6 is a top view of a first strip segment according to some embodiments of the present disclosure;
Fig. 7 is a top view of a first strip segment according to some embodiments of the present disclosure;
Fig. 8 is a top view of a first strip segment according to some embodiments of the present disclosure;
Fig. 9 is a top view of a first strip segment according to some embodiments of the present disclosure;
Fig. 10 is a top view of a first strip segment according to some embodiments of the present disclosure;
Fig. 11 is a top view of the whole welding strip according to some embodiments of the present disclosure;
Fig. 12 is a schematic view of back electric field of the solar cell according to an embodiment of the present disclosure;
Fig. 13 is a schematic view of front electric field of the solar cell according to an embodiment of the present disclosure.
DETAILED DESCRIPTION
The aforementioned features and advantages of the present invention as well as the additional features and advantages thereof will be further clearly understood hereafter as a result of a detailed description of the following embodiments when taken in conjunction with the drawings.
Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. In case of conflict, the specification, including definitions, will control.
As shown in Figs. 2-10, the welding strip for solar battery according to embodiments of the present disclosure includes a first strip segment 1. The first strip segment 1 includes an arc section 11 and a connection section 12 connected to the arc section 11 in a length direction (the right and left direction in Fig. 2) of the first strip segment 1. The first strip segment 1 has a first surface 13 and a second surface 14 opposed to each other in a width direction (the up and down direction in Fig. 4) of the first strip segment 1. The arc section 11 and the connection section 12 may be formed integrally. In some embodiments, at least one notch 15 is formed in at least one of the first and second surfaces 13 and 14, in other words, at least one notch 15 may be formed in the first surface 13 or the second surface 14, or both of the first surface 13 and the second surface 14.
In some embodiments, the arc section 11 and the connection section 12 are disposed alternatively in the length direction, and the arc section 11 is formed by a pre-bending treatment. The first strip segment 1 may include a plurality of the arc sections 11 and a plurality of the connection sections 12. The connection section 12 may be a straight flat portion.
In some embodiments, as shown in Figs. 2, 3 and 9, The notches 15 are formed in both of the first surface 13 and the second surface 14, and the notch 15 formed in the first surface 13 and the notch 15 formed in the second surface 14 are staggerly arranged with respect to each other, in other words, the notches 15 in the first surface 13 and the second surface 14 are not aligned with each other in the width direction. In other embodiments, as shown in Fig. 10, the notches 15 in the first surface 13 and the second surface 14 are aligned to each other in the width direction.
The notches 15 may be formed in at least one of the first and second surfaces of the connection section 12, alternatively, the notches 15 may be formed in at least one of the first and second surfaces of the arc section 11 as well.
The notch 15 may have at least one of rectangle, triangle, arcuate and trapezoid shape.
A radius of curvature of the arc section 11 is from 2.2 mm to 14.81 mm, particularly from 5 mm to 12 mm. In addition, a depth of the notch 15 is from 0.5 mm to 1.5 mm in the width direction of the first strip segment 1, and the notch 15 penetrates through the first strip segment 1 in a thickness direction of the first strip segment 1.
As shown in Fig. 11, the welding strip further includes a second strip segment 2 connected to an end of the first strip segment 1, and the width of the second strip segment 2 is decreased gradually along a direction away from the first strip segment 1. The first and second strip segments 1, 2 may be formed integrally.
As shown in figs. 12-13, the solar battery assembly includes a plurality of solar cells and a plurality of welding strips. Each of the solar cells has a front surface and a back surface.
The welding strips are configured to connect the plurality of solar cells with each other and/or connect the solar cell with a load.
In some embodiments, a front electrode 4 is disposed on the front surface of the solar cell and a back electrode 3 is disposed on the back surface of the solar cell. The first strip segment 1 of the welding strip is connected to a back electrode 3 of a first solar cell of the plurality of the solar cells, and the second strip segment 2 of the welding strip is connected to a front electrode 4 of a second solar cell of the plurality of the solar cells adjacent to and located at a downstream of the first solar cell.
In some embodiments, a position of the notch 15 may be corresponding to a position of the back electrode 3.
In some embodiments, a position of the notch 15 is located between the back electrodes 3 of adjacent solar cells.
EMBODIMENT 1
Taking a polycrystalline cell with size of 156ιτιιηχ 156ιηιηχ200μιη as an example, and the polycrystalline cell has three main grid lines and four segments of back electrode, a size of each segments of the back electrode was 24.5mmx3mm. The basis material of the conductive strip used in this embodiment was a tin-coated strip with a size of 0.2mm (thickness) x2.5mm (width), in which the copper was 0.18 mm, and the tinned layer was 0.02 mm.
The tin-coated strip was cut into welding strips each with a length of 330 mm, then the welding strip was cut with a length of 300 mm by a cutting device. The welding strip was obliquely cut at a position of 145 mm away from the first end, a width of the first end of the welding strip was 0.5 mm, and a width of the welding strip at the position of 145 mm was 2.5mm, so that a second strip segment 2 with a width varying from 0.5 mm to 2.5 mm and a length of 145 mm was provided, and an unfinished first strip segment from a second end of the welding strip to the position of 145 mm was also provided. Next, three notches 15 were formed in a first surface of the unfinished first strip segment at positions of 34mm~60mm, 71mm~97mm, and 108mm~134mm away from the second end of the welding strip, with a depth of 1mm. In the meantime, three arc sections 11 with radius of curvature of 10.1mm were formed at positions at about 24mm~3mm, 61mm~70mm and 98mm~107mm away from the second end by pre-bending, therefore, a final first strip segment was formed.
The welding strip connects the polycrystalline cells in series so as to form a cell string, the cell string was disposed on the EVA (Ethylene Vinyl Acetate )of the glass, then spaces between the cell strings were set by fixing the cell strings with high temperature adhesive tapes, and the cell strings were connected in series with a bus bar, then the connected cell strings were covered with EVA and TPE plate, and laminated in a laminating machine after testing hidden crack via EL(Electro Luminescence) test . The redundant EVA and TPE plate of the laminated product may be cut off, a frame was assembled, and a junction box was connected, so that a solar battery assembly was obtained after curing and cleaning.
A front electrode refers to an electrode (usually, a negative electrode) on a front (light receiving) surface for leading a current out. The front electrode was usually achieved by welding the second strip segment with 60 pieces of polycrystalline cells each with three main grid lines on a single-type welding heating station using an electric soldering iron. The solar cell with a welding strip welded on the front surface was placed on a series welding mold of a series welding heating station, with the front surface facing downward, and the first strip segments were respectively placed on the back (light shielding) surface of the solar cells. A back electrode refers to an electrode (usually, a positive electrode) on the back surface for leading a current out. The back electrode was usually obtained by welding the adjacent pieces of the electrode and the corresponding first strip segment with an electric soldering iron.
Note that the spaces between the solar cells were uniform, and the two sides of the welded cell string were horizontal without deflection, therefore six cell strings formed by the welding strip and the polycrystalline cell according to the present embodiment were achieved.
A P6-30 toughened glass plate was disposed on a laying table, the EVA was disposed on the toughened glass plate, in which the EVA has a size bigger than that of the toughened glass plate, the front surface faces downward, and the cell strings were disposed on EVA at a predetermined space, and fixed with 3M high temperature adhesives.
The cell strings were connected in series with a tin-coated bus bar having a size of
6mmx0.45mm. The bus bars at the positive and negative terminals were L-shaped. The EVA and TPE back plates were covered on the series cell string. A cut with a length of 95mm was formed from the central position of the leading-out end toward to both sides. A space between a cut and an edge of an end of the back plate was about 70mm, so that the leading-out ends of the positive electrode and the negative electrode of the bus bar extended out through the cut.
A solar assembly laminated product was obtained by testing crack with an EL tester, laminating, cooling the laminated piece, and cutting off the redundant EVA and TPE plates of the laminated piece.
Then the above assembly was installed into an aluminum frame, then the frame was connected with the back plate and connections between the frame and the back plate was filled with sealant uniformly. The sealant was also filled in the cuts of the TPE back plate of the leading-out ends of the positive electrode and the negative electrode of the bus bar. The sealant was also filled in the specified position of junction box. The un-cured assembly was placed in the curving apparatus, with a temperature of 25 °C + 2°C and a humidness of 70% ± 10%), for more than four hours. Next, the cured assembly was disposed on a cleaning device to clean a leftover adhesive and dirt, and the leading-out ends of the positive electrode and the negative electrode of the bus bar were connected to the junction box before closing the cover of the junction box. Then the positive electrode and the negative electrode were connected to the junction box to form a final solar battery assembly Al .
EMBODIMENT 2
The battery assembly was formed by the method substantially similar to EMBODIMENT 1.
The only difference was that: three trapezoidal notches were formed in one side of the welding strip, at positions of 20.5mm~36.5mm, 57.5mm~73.5mm, and 94.5mm~l 10.5mm away from the second end of the welding strip, with depth ranging from 0.5mm to 1mm. In the meantime, three arc sections with radius of curvature of 4mm were formed. Therefore, a final solar battery assembly A2 was formed.
EMBODIMENT 3
The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that: three triangular notches were formed in one side of the welding strip, at positions of 20.5mm~36.5mm, 57.5mm~73.5mm, and 94.5mm~l 10.5mm away from the second end of the welding strip, with depth ranging from 0 mm to 1mm. In the meantime, three arc sections with radius of curvature of 6mm were formed. Therefore, a final solar battery assembly A3 was formed. EMBODIMENT 4
The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, three circular arc notches were formed in one side of the welding strip, at positions of 20.5mm~36.5mm, 57.5mm~73.5mm, and 94.5mm~l 10.5mm away from the second end of the welding strip, with depth ranging from 0 mm to 1mm, and then from 1mm to 0mm. In the meantime, three arc sections with radius of curvature of 14.84mm were formed. Therefore, a final solar battery assembly A4 was formed. EMBODIMENT 5
The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, two notches were formed in one side of the welding strip, at positions of 20.5mm~36.5mm and 94.5mm~l 10.5mm away from the second end of the welding strip, and another notch was formed in the other side at positions of 57.5mm~73.5mm away from the second end of the welding strip, with depth of 1mm. In the meantime, three arc sections with radius of curvature of 2.2mm were formed. Therefore, a final solar battery assembly A5 was formed. EMBODIMENT 6
The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, three notches were formed in one side of the welding strip, at positions of 20.5mm~36.5mm, 57.5mm~73.5mm and 94.5mm~l 10.5mm away from the second end of the welding strip, and another notch was formed in the other side at 57.5mm~73.5mm away from the second end of the welding strip, with depth of 0.5mm, and then from 1mm to 0mm. In the meantime, the four arc sections with radius of curvature of 12mm were formed. Therefore, a final solar battery assembly A6 was formed.
EMBODIMENT 7
The battery assembly was formed by the method substantially similar to EMBODIMENT 1.
The only difference was that, the second strip segment was right trapezoid in shape, and the radius of curvature of the arc section was 10mm. Therefore, a final solar battery assembly A7 was formed. EMBODIMENT 8
The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, the position of the notch of the first strip was corresponding to that of the back electrode of the solar cell, and the radius of curvature of the arc section was 13mm. Therefore, a final solar battery assembly A8 was formed.
EMBODIMENT 9 The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, the notch was 1.5mm in depth, and the radius of curvature of the arc section was 5mm. Therefore, a final solar battery assembly A9 was formed. EMBODIMENT 10
The battery assembly was formed by the method substantially similar to EMBODIMENT 1. The only difference was that, the notch was 0.5mm in depth, and the radius of curvature of the arc section was 8mm. Therefore, a final solar battery assembly A10 was formed. COMPARING EXAMPLE
Taking a polycrystalline cell with size of 156ιτιιηχ 156ιηιηχ200μιη as an example, and the polycrystalline cell has three main grid lines and four segments of back electrode, a size of each segments of the back electrode was 24.5mmx3mm. The basis material of the conductive strip used in this embodiment was a tin-coated strip with a size of 0.2mm (thickness) x2.5mm (width), in which the copper was 0.18 mm, and the tinned layer was 0.02 mm.
The tin-coated strip was cut into welding strip with a length of 330 mm, then the welding strip was cut with a length of 300 mm by a cutting device. Thus a conventional welding strip was provided, with a length of 155 mm, and a segment of the welding strip has an isosceles trapezoid shape having a width gradually increasing from 0.5 mm to 2.5 mm. Another segment of the welding strip has a rectangle shape with size of 145mmx2.5mm.
60 pieces of polycrystalline cells are connected with the welding strip, the segment of the welding strip having varying width is welded on the front surface of the cells on a single-type welding heating station using an electric soldering iron. The solar cell with a welding strip welded on the front surface was placed on a series welding mold of a series welding heating station, with the front surface facing downward, and the segment of the welding strip having constant width was placed on the back surface of the cells. Ten solar cells are arranged, adjacent pieces of the electrode on the back surface are welded an electric soldering iron.
Note that the spaces between the solar cells were uniform, and the two sides of the welded cell string were horizontal without deflection, therefore six cell strings formed by the welding strip and the polycrystalline cell according to the present embodiment were achieved.
A toughened glass plate was provided on an operation station; a first binding agent layer EVA was formed on the toughened glass plate; the cell string was arranged on the binding agent layer; a second binding agent layer was formed on the cell string; a backing plate was formed on the second binding agent layer; the above layers were laminated in an laminating machine to form the solar battery assembly. Then the solar battery assembly was assembled with frame, and the positive electrode and the negative electrode were connected to the junction box to form a solar battery assembly CA1.
Performance Test
Hidden Crack Test
The solar battery assemblies according to EMBODIMENTS 1-10 and COMPARING EXAMPLE were tested under a same ambient temperature respectively, by using a solar battery assembly test apparatus with a hidden crack tester. Results were list in Table 1.
Power Test
The solar battery assemblies according to EMBODIMENTS 1-10 and COMPARING EXAMPLE were tested with a solar simulator. Results were list in Table 2.
Table 1
Figure imgf000012_0001
Tab le 2
Module Rs Pmax
Al 0.41275 245.9754
A2 0.406854 246.5635
A3 0.405643 246.2214
A4 0.418642 245.2031
A 5 0.425130 244.9963
A6 0.412168 245.6335
A7 0.415432 245.2153
A8 0.411496 245.5660
A9 0.413540 245.7542
A10 0.406598 246.9954
CA1 0.405256 247.0321
It can be seen from the results of table 1 that, the solar assembly according to embodiments of the present disclosure were not cracked before or after laminating, however, the solar assembly according to the COMPARING EXAMPLE was cracked after laminating.
It can be seen from the results of table 2 that, with the welding strip according to embodiment of the present invention, the solar assembly has a good internal resistance, and the possibility of cracking was reduced.
Although explanatory embodiments have been shown and described, it would be appreciated by those skilled in the art that the above embodiments cannot be construed to limit the present disclosure, and changes, alternatives, and modifications can be made in the embodiments without departing from spirit, principles and scope of the present disclosure.

Claims

WHAT IS CLAIMED IS:
1. A welding strip for solar battery, comprising a first strip segment defining a first surface and a second surface opposed to each other in a width direction of the first strip segment, wherein the first strip segment comprises an arc section and a connection section connected to the arc section in a length direction of the first strip segment, and at least one notch is formed in at least one of the first and second surfaces.
2. The welding strip according to claim 1, wherein the arc section and the connection section are formed integrally.
3. The welding strip according to claim 1 or 2, wherein the notch is formed in each of the first and second surfaces, and the notch formed in the first surface and the notch formed in the second surface are staggerly arranged with respect to each other.
4. The welding strip according to any one of claims 1-3, wherein the notch is formed in at least one of a first surface and a second surface of the connection section.
5. The welding strip according to any one of claims 1-4, wherein the notch comprises at least one of rectangle, triangle, round and trapezoid in shape.
6. The welding strip according to any one of claims 1-5, wherein a depth of the notch is from 0.5 mm to 1.5 mm in the width direction of the first strip segment.
7. The welding strip according to any one of claims 1-6, wherein the notch penetrates through the first strip segment in a thickness direction of the first strip segment.
8. The welding strip according to any one of claims 1-7, wherein a radius of curvature of the arc section is from 2.2 mm to 14.81 mm.
9. The welding strip according to any one of claims 1-8, further comprising a second strip segment connected to an end of the first strip segment, wherein a width of the second strip segment is decreased gradually along a direction away from the first strip segment.
10. The welding strip according to claim 9, wherein the first and second strip segments are formed integrally.
11. A solar battery assembly, comprising:
a plurality of solar cells, each of the solar cells defining a front surface and a back surface; a plurality of welding strips configured to connect the plurality of solar cells with each other, wherein the welding strip is according to any one of claims 1-10.
12. The solar battery assembly according to claim 11, wherein each solar cell comprises a front electrode disposed on the front surface and a back electrode disposed on the back surface, the first strip segment of the welding strip is connected to a back electrode of a first solar cell of the plurality of the solar cells, and the second strip segment of the welding strip is connected to a front electrode of a second solar cell of the plurality of the solar cells located at a downstream of the first solar cell.
13. The solar battery assembly according to claim 11 or 12, wherein a position of the notch is corresponding to a position of the back electrode.
14. The solar battery assembly according to claim 11 or 12, wherein a position of the notch is located between the back electrodes adjacent to each other.
PCT/CN2014/076417 2013-04-27 2014-04-28 Welding strip for solar battery and solar battery assembly WO2014173331A1 (en)

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CN109509806A (en) * 2018-12-26 2019-03-22 苏州阿特斯阳光电力科技有限公司 Solar cell module and its tooling for processing busbar in the component
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