CN111933735B - Welding strip for laminated photovoltaic module and laminated photovoltaic module - Google Patents
Welding strip for laminated photovoltaic module and laminated photovoltaic module Download PDFInfo
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- CN111933735B CN111933735B CN202010780764.2A CN202010780764A CN111933735B CN 111933735 B CN111933735 B CN 111933735B CN 202010780764 A CN202010780764 A CN 202010780764A CN 111933735 B CN111933735 B CN 111933735B
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- laminated photovoltaic
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- 238000003466 welding Methods 0.000 title claims abstract description 96
- 239000000853 adhesive Substances 0.000 claims abstract description 36
- 230000001070 adhesive effect Effects 0.000 claims abstract description 36
- 230000007704 transition Effects 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 33
- 238000000576 coating method Methods 0.000 claims abstract description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims abstract description 17
- 238000003475 lamination Methods 0.000 claims abstract description 16
- 230000008569 process Effects 0.000 claims abstract description 13
- 238000000137 annealing Methods 0.000 claims abstract description 9
- 229910001174 tin-lead alloy Inorganic materials 0.000 claims abstract description 5
- 229910052802 copper Inorganic materials 0.000 claims description 10
- 239000010949 copper Substances 0.000 claims description 10
- 238000010438 heat treatment Methods 0.000 claims description 8
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 6
- 239000007788 liquid Substances 0.000 claims description 6
- 239000000741 silica gel Substances 0.000 claims description 6
- 229910002027 silica gel Inorganic materials 0.000 claims description 6
- 238000004132 cross linking Methods 0.000 claims description 3
- 230000035882 stress Effects 0.000 abstract description 10
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 239000012634 fragment Substances 0.000 abstract description 7
- 230000009471 action Effects 0.000 abstract description 4
- 230000006355 external stress Effects 0.000 abstract description 4
- 238000005457 optimization Methods 0.000 abstract description 2
- 238000004080 punching Methods 0.000 abstract description 2
- 229910000679 solder Inorganic materials 0.000 description 9
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 description 8
- 238000005516 engineering process Methods 0.000 description 4
- 229910045601 alloy Inorganic materials 0.000 description 2
- 239000000956 alloy Substances 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 238000007711 solidification Methods 0.000 description 2
- 230000008023 solidification Effects 0.000 description 2
- 239000000758 substrate Substances 0.000 description 2
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005485 electric heating Methods 0.000 description 1
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 description 1
- 229910052737 gold Inorganic materials 0.000 description 1
- 239000010931 gold Substances 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 238000001579 optical reflectometry Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004901 spalling Methods 0.000 description 1
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
Landscapes
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a welding belt for a laminated photovoltaic module, which is prepared by forming a middle section and a transition section with gradually changed thickness and slender and flat shape by locally punching a round copper wire, integrally annealing, and coating tin-lead alloy on the surface; and discloses a laminated photovoltaic module with the welding strip. Through optimization and annealing treatment of the welding strip structure, the overall yield strength of the welding strip is reduced, and the stress impact of the welding strip after being contacted with a battery piece can be reduced. The welding strips are connected with the battery pieces through the adhesive, the adhesive is cured in a fractional manner, the manufactured laminated photovoltaic module can avoid hard contact of the battery pieces, the welding strips and the battery pieces in an overlapping area, the thickness of the adhesive is gradually increased, stress impact in the lamination process can be resisted in the overlapping area, the risk of process fragments is reduced, the production yield of the laminated photovoltaic module is improved, the hidden crack risk of the packaged module under the action of external stress is greatly reduced, and the reliability of the module is greatly improved.
Description
Technical Field
The invention relates to a welding strip and a photovoltaic module thereof, in particular to a welding strip for a laminated photovoltaic module and a laminated photovoltaic module.
Background
At present, the high electricity-making cost is still a main factor for restricting the photovoltaic to occupy the energy mainstream market, and the existing bottleneck can be broken through only cost reduction and efficiency enhancement. At present, the efficiency improving method of mass production comprises technologies of half-sheet, double-sided, multi-main grid and the like, which leads to the substantial increase of the single power of the photovoltaic module, but the lower efficiency of the module.
In order to further reduce the cost and increase the efficiency, the stitch welding technology has become a new direction of industry development, the assembly efficiency can be further improved, the conventional stitch welding technology is to perform battery stitch welding after the welding strip is flattened in series welding, but the yield strength of the welding strip is greatly improved after the welding strip is flattened under the direct stress action, the hard contact between the battery and the hard welding strip is carried out, the process fragment risk is increased, and meanwhile, the hidden crack risk of the welding strip and the battery is greatly improved due to the bending of the assembly under the external stress.
The welding strip structure (national standard: china, publication No. 107564987A, publication date: 2018-01-09) for the lamination assembly comprises a welding strip flat part, an upper layer battery piece connecting part and a lower layer battery piece connecting part which are positioned at two sides of the welding strip flat part; the front/back of the lower/upper layer battery piece is provided with a plurality of thin grid lines in parallel; the cutting direction of the lower layer battery piece and the upper layer battery piece is parallel to the thin grid line; the welding strip structure is perpendicular to the thin grid line or parallel to the main grid line; the upper layer battery piece part is stacked with the lower layer battery piece, the stacking area is welded with the thin grid line/main grid line on the front side of the lower layer battery piece and the thin grid line/main grid line on the back side of the upper layer battery piece through the welding strip flat part, the upper layer battery piece connecting part is welded with the thin grid line/main grid line on the back side of the upper layer battery piece, and the lower layer battery piece connecting part is welded with the thin grid line/main grid line on the front side of the lower layer battery piece. This technique reduces the stress of the weld at the lamination under what temperature stress the MBB lamination assembly or Smartwire lamination assembly is loaded with, so that MBB and Smartwire techniques can be applied to lamination assemblies. But only by stamping the welding strip, the yield strength of the welding strip is greatly improved, the thickness of a tin layer on the surface of the welding strip is uneven in the stamping process, and the risk of process fragments is greatly increased.
The solder strip and the manufacturing method thereof, the battery string and the manufacturing method thereof, and the manufacturing method of the solder strip disclosed by the photovoltaic module (national: china, publication No. 110504335A, publication date: 2019-11-26) comprise the step of pressurizing and heat-treating the middle part of the solder strip to form a flattened part. The welding strip prepared by the preparation method is used for preparing the photovoltaic module, so that the power generation density is improved, the cost of packaging materials is reduced, the overlapping shielding of the battery pieces is avoided, and the risk of cracking and fragments of the module Cheng Yin is reduced. In the technology, although the welding strip is subjected to heat treatment, the welding strip treated by the heat treatment method still has higher yield strength, so that a certain interval is still needed between battery pieces to reduce the chip rate of the manufacturing process, and the unit power output of the assembly is reduced due to the existence of the interval between the pieces, so that the cost is increased.
The tin-coated copper strip disclosed by the extremely soft tin-coated copper strip for the solar cell (national standard: china, publication number: 102592702A, publication date: 2012-07-18) comprises a copper substrate and an alloy coating, wherein the alloy coating is uniformly coated on the front surface and the back surface of the copper substrate to form the tin-coated copper strip. The front and back surfaces are combined on one sideThe thickness of the gold coating is 0.01-0.03mm. The yield strength of the tin-coated copper strip is less than or equal to 50N/mm 2 Tensile strength is more than or equal to 135N/mm 2 The elongation percentage is more than or equal to 15 percent. The tin-coated copper strip is tightly attached to the battery piece when being welded with the battery piece, so that the false welding, the off-welding and the off-welding caused by curling and arching are avoided, the power generation efficiency of the solar battery piece can be comprehensively improved, the fragment rate is reduced, the cost is saved, the profit space is enlarged, and the product competitiveness is improved. The tin-coated copper strip is extremely soft in hardness, but the whole thickness is ultrathin due to the fact that the tin-coated copper strip is realized through whole pulling, the welding strip can be greatly improved, meanwhile, the width is obviously increased, the shielding area of a battery is improved, on the other hand, the light reflectivity of the flat welding strip is lower, the unit power output of the assembly is greatly reduced due to the factors, the single watt cost of the assembly is greatly increased, and the competitiveness of a product is greatly reduced.
Disclosure of Invention
The invention aims to: in view of the above problems, it is an object of the present invention to provide a solder strip for a laminated photovoltaic module, which improves the anti-spalling capability of the module, and another object of the present invention is to provide a laminated photovoltaic module having such a solder strip.
The technical scheme is as follows: the utility model provides a lamination photovoltaic module is with area of welding, the area of welding divide into middle section, the head section at both ends and be in the middle section with changeover portion between the head section, the cross section of middle section, longitudinal section are the rectangle, the cross section of head section is rectangle, the longitudinal section is circular, the cross section of changeover portion is trapezoidal, the longitudinal section is rectangle, the diameter D of head section 1 A thickness D greater than the middle section 2 The thickness of the transition section is from D 1 To D 2 Gradual change and symmetrical gradual change in the thickness direction of two sides, the diameter D of the head section 1 Less than the width D of the middle section 3 The width of the transition section is from D 1 To D 3 And (5) gradual change.
Further, the diameter D of the head section 1 The thickness D of the middle section is 0.15-0.4 mm 2 0.2 to 0.75D 1 Width D 3 1.5 to 3.5D 1 。
Further, the length L of the middle section 1 0.8 to6mm, length L of the head section 2 20-210 mm, the length L of the transition section 3 Is 1-10 mm.
Further, the welding strip is formed by locally punching a circular copper wire to form the middle section and the transition section, then integrally annealing, and then coating tin-lead alloy on the surface, wherein the yield strength of the welding strip is 60-75 MPa.
The laminated photovoltaic module with the welding strip is characterized in that two ends of the welding strip are respectively connected with two adjacent battery pieces, the two battery pieces are respectively positioned on the upper side and the lower side of the welding strip and form an overlapped area at the center of the middle section, and the battery pieces are connected with the welding strip through adhesive, so that the battery pieces and the welding strip are continuously in series welding to form the laminated photovoltaic module; the coating surface of the adhesive is the full contact surface of the battery piece (4) with the middle section (1) and the transition section (3) and the partial contact surface from the transition section (3) to the head section (2), the coating thickness of the adhesive (5) on the head section (2) is 0.02-0.1 mm, the coating thickness on the middle section (1) is 0.1-0.3 mm, and the gap between the welding strip and the battery piece (4) is coated and filled on the transition section (3).
Further, the length of an overlapping area formed by two adjacent battery pieces on the upper side and the lower side of the welding strip at the center of the middle section is 0.2-0.8 mm.
Further, the coating length of the adhesive on the head section is 5-20 mm from the transition section to the head section.
Further, the adhesive is liquid silica gel.
Further, after the adhesive is coated and connected with the battery piece and the welding strip, the adhesive is primarily cured through primary heating, and then the adhesive is completely cured in the lamination process, wherein the primary heating temperature is 160-190 ℃, and the degree of crosslinking of the primary curing is 20-40%.
The beneficial effects are that: compared with the prior art, the invention has the advantages that: through optimization and annealing treatment of the welding strip structure, the overall yield strength of the welding strip is reduced, and the stress impact of the welding strip after being contacted with a battery piece can be reduced. The welding strips are connected with the battery pieces through the adhesive, the adhesive is cured in a fractional manner, the manufactured laminated photovoltaic module can avoid hard contact of the battery pieces, the welding strips and the battery pieces in an overlapping area, the thickness of the adhesive is gradually increased, stress impact in the lamination process can be resisted in the overlapping area, the risk of process fragments is reduced, the production yield of the laminated photovoltaic module is improved, the hidden crack risk of the packaged module under the action of external stress is greatly reduced, and the reliability of the module is greatly improved.
Drawings
FIG. 1 is a front view of a solder strip;
FIG. 2 is a top view of a solder strip;
fig. 3 is a schematic structural diagram of a laminated photovoltaic module formed by connecting a solder strip with a battery piece;
fig. 4 is a top view of fig. 3.
Detailed Description
The invention is further elucidated below in connection with the drawings and the specific embodiments. These examples are only for illustrating the present invention and are not intended to limit the scope of the present invention.
The welding strip for the laminated photovoltaic module is divided into a middle section 1, a head section 2 at two ends and a transition section 3 between the middle section 1 and the head section 2 as shown in figures 1 and 2.
The cross section and the longitudinal section of the middle section 1 are rectangular, the cross section of the head section 2 is rectangular, the longitudinal section is circular, the cross section of the transition section 3 is trapezoid, the longitudinal section is rectangular, and the diameter D of the head section 2 is smaller than that of the head section 2 1 Thickness D of > middle section 1 2 The thickness of the transition section 3 is from D 1 To D 2 Gradually changing and symmetrically gradually changing in the thickness direction of the two sides of the welding strip, and the diameter D of the head section 2 1 Width of middle section 1D 3 The width of the transition section 3 is from D 1 To D 3 And (5) gradual change.
The welding strip is formed by diameter D 1 The circular copper wire is formed into a middle section 1 and a transition section 3 with slender and flat gradually-changed thickness through partial stamping, and then is integrally annealed, and the surface of the copper wire is coated with tin-lead alloy. After the round copper wire is locally stamped, the yield strength of the areas of the middle section 1 and the transition section 3 is 120-160 MPa, the annealing adopts an electric heating mode, the current is set to be 5-15A, and the duration is set to be 2.5After 5s of integral annealing, the yield strength of the welding strip is 60-75 Mpa, and the yield strength of the areas of the middle section 1 and the transition section 3 is equal to that of the first section 2.
Diameter D of head section 2 1 The thickness D of the middle section 1 is 0.15-0.4 mm 2 0.2 to 0.75D 1 Width D 3 1.5 to 3.5D 1 。
Length L of the middle section 1 1 Length L of head section 2 is 0.8-6 mm 2 20-210 mm, length L of transition section 3 3 Is 1-10 mm.
With the laminated photovoltaic module with the welding strip, as shown in fig. 3 and 4, two adjacent battery pieces 4 (denoted as battery pieces 41 and 42) are respectively positioned at two ends of the welding strip and are respectively positioned at the upper side and the lower side of the welding strip, the battery pieces 41 and 42 are overlapped up and down at the center of the middle section 1, and the length of the formed overlapped area is 0.2-0.8 mm.
The battery piece 4 is connected with the welding strip through the adhesive 5, the coating surface of the adhesive 5 is the full contact surface of the battery piece 4, the middle section 1 and the transition section 3, and the partial contact surface with the length of 5-20 mm from the transition section 3 to the direction of the head section 2, the coating thickness of the adhesive 5 on the head section 2 is 0.02-0.1 mm, the coating thickness on the head section 2 is equal, the coating thickness on the middle section 1 is 0.1-0.3 mm, the coating thickness on the middle section 1 is equal, and the gap between the welding strip and the battery piece 4 is filled by coating on the transition section 3. The adhesive 5 is liquid silica gel.
And continuously welding the battery piece and the welding strip in series according to the structure to form the laminated photovoltaic module. In the process of series welding the lamination assembly of the battery piece, a layer of liquid silica gel to be solidified is coated on the welding strip and the coating surface of the battery piece, then the welding strip and the battery piece are placed in a lamination mode, the liquid silica gel is preliminarily solidified through preliminary heating during welding, the preliminary heating temperature is 160-190 ℃, the cross-linking degree of the preliminary solidification is 20-40%, and then the liquid silica gel is completely solidified in the lamination process. Fig. 3 shows the optimum state of the laminated photovoltaic module after lamination, and the gap filling transition of the adhesive between the cell and the solder strip is good.
After the structure of the welding strip and annealing treatment, the thickness of the tin-lead alloy layer coated can be kept uniform, the yield strength of the whole welding strip is reduced compared with that of a raw material copper wire, the yield strength of a stamping area is equivalent to that of an un-stamped part, and the stress impact of the welding strip after the welding strip is contacted with a battery piece can be reduced. When the lamination assembly is manufactured, the adhesive is primarily cured, a certain buffer area is provided for the adjacent upper and lower batteries, the adhesive is completely cured, and the hard contact between the battery piece and the welding strip and between the battery pieces can be avoided in the overlapped area. The two-time solidification provides different stress buffering capacities, because the edge part structure of the battery piece after laser cutting is fragile, the battery piece is stacked up and down to cause the whole inclination, the pressure born by the overlapping part is larger, the thickness of the adhesive is increased, especially the overlapping area can resist the stress impact in the lamination process, the risk of process fragments is reduced, the production yield of the laminated photovoltaic module is improved, the hidden crack risk of the packaged module under the action of external stress is greatly reduced, and the reliability of the module is greatly improved.
The following samples were prepared into laminated photovoltaic modules based on the same series welding conditions for performance comparison.
Sample 1: the welding strip is a round copper wire with the diameter of 0.3mm, and is made into a laminated photovoltaic module with the battery piece without treatment.
Sample 2: the welding strip is the structure of the invention, and the diameter D of the head section 1 Thickness D of the middle section of 0.3mm 2 0.15mm, but without annealing treatment according to the invention, is connected with the cell sheet to form a laminated photovoltaic module without adhesive.
Sample 3: the welding strip is of the structure and is annealed, and the diameter D of the head section 1 Thickness D of the middle section of 0.3mm 2 And the thickness of the laminated photovoltaic module is 0.15mm, and the laminated photovoltaic module is connected with the cell sheet without adhesive.
Sample 4: the welding strip is of the structure and is annealed, and the diameter D of the head section 1 Thickness D of the middle section of 0.3mm 2 The laminated photovoltaic module with the structure is manufactured by 0.15mm and the battery piece, the coating thickness of the adhesive on the head section is 0.05mm, the coating thickness on the middle section is 0.2mm, and the gap between the welding strip and the battery piece is filled by coating on the transition section.
Sample 5: the welding strip is of the structure and is annealed, and the head section is straightDiameter D 1 Thickness D of the middle section of 0.3mm 2 The laminated photovoltaic module with the structure is manufactured by 0.15mm and the battery piece, but the adhesive only coats the contact surfaces of the middle section and the transition section and the battery piece, the coating thickness on the transition section is 0.1mm, and the coating thickness on the middle section is 0.2mm.
Sample 6: the welding strip is of the structure and is annealed, and the diameter D of the head section 1 Thickness D of the middle section of 0.3mm 2 The laminated photovoltaic module with the structure is manufactured by 0.15mm and the battery piece, the coating thickness of the adhesive on the head section is 0.1mm, the coating thickness on the middle section is 0.3mm, and the gap between the welding strip and the battery piece is filled by coating on the transition section.
Sample 7: the welding strip is of the structure and is annealed, and the diameter D of the head section 1 Thickness D of the middle section of 0.3mm 2 The laminated photovoltaic module with the structure is manufactured by 0.15mm and the battery piece, the coating thickness of the adhesive on the head section is 0.02mm, the coating thickness on the middle section is 0.1mm, and the gap between the welding strip and the battery piece is filled by coating on the transition section.
Comparing laminated photovoltaic module batch products of samples 1 to 4:
comparing laminated photovoltaic module batch products of samples 4 to 7:
Claims (7)
1. a laminated photovoltaic module, characterized in that: the welding strip for the laminated photovoltaic module is divided into a middle section (1), head sections (2) at two ends and a transition section (3) between the middle section (1) and the head sections (2), the cross section and the longitudinal section of the middle section (1) are rectangular, the cross section and the longitudinal section of the head sections (2) are rectangular, the longitudinal section is circular, and the transition section (3)The cross section is trapezoid, the longitudinal section is rectangular, and the diameter D of the head section (2) is 1 Is greater than the thickness D of the middle section (1) 2 The thickness of the transition section (3) is D 1 To D 2 Gradual change and symmetrical gradual change in the thickness direction of two sides, the diameter D of the head section (2) 1 Is smaller than the width D of the middle section (1) 3 The width of the transition section (3) is D 1 To D 3 Gradually changing; two ends of the welding strip are respectively connected with two adjacent battery pieces (4), the two battery pieces (4) are respectively positioned on the upper side and the lower side of the welding strip and form an overlapping area at the center of the middle section (1), and the battery pieces (4) are connected with the welding strip through an adhesive (5), so that the battery pieces (4) and the welding strip are continuously in series welding to form a laminated photovoltaic assembly; the coating surface of the adhesive (5) is the full contact surface of the battery piece (4) and the middle section (1) and the transition section (3) and the partial contact surface from the transition section (3) to the head section (2), the coating thickness of the adhesive (5) on the head section (2) is 0.02-0.1 mm, the coating thickness on the middle section (1) is 0.1-0.3 mm, and the gap between the welding strip and the battery piece (4) is filled by coating on the transition section (3);
after the adhesive (5) is coated and connected with the battery piece (4) and the welding strip, the adhesive (5) is primarily cured through primary heating, and then the adhesive (5) is completely cured in the lamination process, wherein the primary heating temperature is 160-190 ℃, and the degree of crosslinking of the primary curing is 20-40%.
2. The laminated photovoltaic module of claim 1, wherein: diameter D of the head section (2) 1 Is 0.15-0.4 mm, and the thickness D of the middle section (1) 2 0.2 to 0.75D 1 Width D 3 1.5 to 3.5D 1 。
3. The laminated photovoltaic module of claim 1, wherein: length L of the middle section (1) 1 0.8 to 6mm, saidLength L of head section (2) 2 20-210 mm, the length L of the transition section (3) 3 Is 1-10 mm.
4. The laminated photovoltaic module of claim 1, wherein: the welding strip is prepared by forming the middle section (1) and the transition section (3) by partial stamping of round copper wires, integrally annealing, and coating tin-lead alloy on the surface, wherein the yield strength of the welding strip is 60-75 MPa.
5. The laminated photovoltaic module of claim 1, wherein: the length of an overlapping area formed by two adjacent battery pieces (4) on the upper side and the lower side of the welding strip at the center of the middle section (1) is 0.2-0.8 mm.
6. The laminated photovoltaic module of claim 1, wherein: the coating length of the adhesive (5) on the head section (2) is 5-20 mm from the transition section (3) to the head section (2).
7. The laminated photovoltaic module of claim 1, wherein: the adhesive (5) is liquid silica gel.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010780764.2A CN111933735B (en) | 2020-08-06 | 2020-08-06 | Welding strip for laminated photovoltaic module and laminated photovoltaic module |
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| CN202010780764.2A CN111933735B (en) | 2020-08-06 | 2020-08-06 | Welding strip for laminated photovoltaic module and laminated photovoltaic module |
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| CN111933735B true CN111933735B (en) | 2024-03-29 |
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| CN112802914A (en) * | 2020-12-29 | 2021-05-14 | 中山德华芯片技术有限公司 | Flexible solar cell module and packaging method thereof |
| CN113471329A (en) * | 2021-06-18 | 2021-10-01 | 安徽大恒能源科技有限公司 | Component production process for reducing battery subfissure |
| CN215815898U (en) * | 2021-07-16 | 2022-02-11 | 上海晶科绿能企业管理有限公司 | Photovoltaic module |
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