CN215815898U - Photovoltaic module - Google Patents
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- CN215815898U CN215815898U CN202121625350.9U CN202121625350U CN215815898U CN 215815898 U CN215815898 U CN 215815898U CN 202121625350 U CN202121625350 U CN 202121625350U CN 215815898 U CN215815898 U CN 215815898U
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- 238000003466 welding Methods 0.000 claims abstract description 79
- 239000000758 substrate Substances 0.000 claims abstract description 24
- 239000002356 single layer Substances 0.000 claims abstract description 10
- 238000005520 cutting process Methods 0.000 claims abstract description 5
- 229910000679 solder Inorganic materials 0.000 claims description 63
- 239000010410 layer Substances 0.000 claims description 45
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 34
- 230000007704 transition Effects 0.000 claims description 25
- 230000001681 protective effect Effects 0.000 claims description 13
- 239000012790 adhesive layer Substances 0.000 claims description 11
- 239000003292 glue Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 abstract description 4
- 238000012360 testing method Methods 0.000 description 11
- 238000000034 method Methods 0.000 description 10
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- 230000000694 effects Effects 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 238000010248 power generation Methods 0.000 description 5
- 238000013461 design Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 238000002474 experimental method Methods 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 3
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 2
- 230000000052 comparative effect Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000005038 ethylene vinyl acetate Substances 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229920006124 polyolefin elastomer Polymers 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000004831 Hot glue Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000013467 fragmentation Methods 0.000 description 1
- 238000006062 fragmentation reaction Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 230000008018 melting Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
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- 238000005476 soldering Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- 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
-
- 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
- H01L31/048—Encapsulation of modules
-
- 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
- Y02E10/52—PV systems with concentrators
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- 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)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Photovoltaic Devices (AREA)
Abstract
The application provides a photovoltaic module which comprises a battery string, wherein the battery string comprises a plurality of battery pieces, the battery pieces are N sub-pieces formed by cutting a battery substrate along the extending direction of a main grid in a first direction, N is more than or equal to 2, the plurality of battery pieces are sequentially arranged along the first direction, each battery piece comprises a single layer area and a stacking area, and the adjacent battery pieces are stacked in the stacking area; the welding strip is welded on the front face of one battery piece and the back face of the other battery piece, the welding strip comprises a reflecting section and a flat section which are connected, the reflecting section is located on the front face of the battery piece and welded on the single-layer area, at least part of the flat section is arranged between the two stacked battery pieces in the stacking area, the thickness of the reflecting section is 0.18-0.27 mm, and the thickness of the flat section is 0.08-0.15 mm. The pressure intensity of welding the area to the battery piece production can be reduced to this application, reduces the hidden risk of splitting that the battery piece exists in the overlap region.
Description
Technical Field
The application relates to the technical field of photovoltaic production, in particular to a photovoltaic module.
Background
Photovoltaic cell piece is connected through welding the area and is formed the solar cell cluster, can realize the power generation effect, and present trade adopts circular welding area, combines the multigrid technique to realize high-efficient output assembly, connects through welding the area between the battery piece, generally is equipped with the determining deviation, and the inside non-battery area of subassembly (in the clearance between two adjacent battery pieces promptly) can't generate electricity, causes the waste in power station place. The stitch welding technology (namely TR technology) is to remove the gap between the battery pieces, and the distance between the overlapping parts of the end parts of two adjacent battery pieces is removed, so that the output efficiency of the assembly is improved, and the site utilization rate of a power station is improved.
However, since in the stitch welding technology, a gap exists between two adjacent battery pieces in the overlapping area in the thickness direction, during the lamination process, the welding strip in the gap is prone to generate large pressure on the battery pieces, so that the battery pieces have a large hidden crack risk.
SUMMERY OF THE UTILITY MODEL
The application provides a photovoltaic module to reduce the pressure that solder strip produced the battery piece among the stitch welding technique, reduce the hidden risk of splitting that the battery piece exists in the overlap region.
The application provides a photovoltaic module, includes: a battery string, the battery string comprising:
the battery pieces are N sub-pieces formed by cutting a battery substrate along the extending direction of the main grid in the first direction, N is more than or equal to 2, the battery pieces are sequentially arranged along the first direction, each battery piece comprises a single layer area and a stacking area, and the adjacent battery pieces are stacked in the stacking area;
the welding strip is welded on the front face of one of the battery pieces and the back face of the other battery piece so as to connect the two adjacent battery pieces together, the welding strip comprises a light reflecting section and a flat section which are connected, the light reflecting section is positioned on the front face of the battery piece and welded on the single-layer area, at least part of the flat section is arranged in the stacking area between the two stacked battery pieces, the thickness of the light reflecting section is 0.18-0.27 mm, and the thickness of the flat section is 0.08-0.15 mm.
The technical scheme provided by the application can achieve the following beneficial effects:
the photovoltaic module that this application provided includes a plurality of battery pieces and solder strip. The battery piece adopts N fragmentation and cooperates the thin area of welding of thin to use, can reduce to weld the area to sheltering from on battery piece surface, improves the generated power, adopts thinner area of welding, can also further reduce the thickness of protection glue film, realizes reduce cost's demand. After the thin welding strips are flattened, the parts of the corresponding overlapping areas on the welding strips are flat, so that the deformation of the battery piece under pressure after the battery piece is contacted with the welding strips is reduced, the gap between the overlapping areas of two adjacent battery pieces along the thickness direction can be reduced, and the hidden crack risk of the battery piece in the overlapping areas can be reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
Fig. 1 is a schematic structural diagram of a photovoltaic module provided in an embodiment of the present application;
FIG. 2 is a schematic diagram of the exploded structure of FIG. 1;
fig. 3 is a schematic longitudinal sectional view of a photovoltaic module provided in an embodiment of the present application;
fig. 4 is a schematic cross-sectional view of a photovoltaic module according to an embodiment of the present disclosure in a single layer area of a cell;
fig. 5 is a schematic cross-sectional view of a photovoltaic module provided in an embodiment of the present application in a cell stack area;
FIG. 6 is a schematic cross-sectional view of a light reflecting section of a solder strip provided in an embodiment of the present application;
FIG. 7 is a schematic cross-sectional view of a flattened section of a solder strip provided in an embodiment of the present application;
FIG. 8 is a schematic partial structure diagram of a solder strip provided in an embodiment of the present application;
FIG. 9 is a line graph plotted according to the data in Table 1;
FIG. 10 is a line graph plotted according to the data in Table 2;
fig. 11 is a line graph plotted according to the data in table 3.
Reference numerals:
1-a battery piece;
2-protective glue layer;
3-light-transmitting plate;
4-a back plate;
5-welding a strip;
50-a light reflecting section;
52-flat section;
520-a body;
522-a transition section;
6-main grid.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
In the description of the present application, unless explicitly stated or limited otherwise, the terms "first", "second", and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; the term "plurality" means two or more unless specified or indicated otherwise; the terms "connected," "fixed," and the like are to be construed broadly and may, for example, be fixedly connected, detachably connected, integrally connected, or electrically connected; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
In the description of the present application, it should be understood that the terms "upper" and "lower" used in the description of the embodiments of the present application are used in a descriptive sense only and not for purposes of limitation. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
As shown in fig. 1 to 7, the present application provides a photovoltaic module, which includes a cell string layer, a protective adhesive layer 2, a light-transmitting plate 3, and a back plate 4. The battery string layer comprises a plurality of battery strings, each battery string comprises a plurality of battery pieces 1, the plurality of battery pieces 1 are sequentially arranged along a first direction, the plurality of battery strings are sequentially arranged along a second direction, and the second direction is perpendicular to the first direction; the light-transmitting plate 3 is arranged on the front surface of the battery string layer, and the sunlight can penetrate through the light-transmitting plate 3 and irradiate on the surface of the battery string layer; the back plate 4 is arranged on the back of the battery string layer, the back plate 4 can be made of a light-transmitting material, so that the photovoltaic assembly forms a double-glass assembly, or the back plate 4 can also be made of a light-tight material, so that the photovoltaic assembly forms a single-glass assembly; the protective adhesive layers 2 cover two surfaces of the cell string layer, that is, the protective adhesive layers 2 are respectively arranged between the cell string layer and the light-transmitting plate 3 and between the cell string layer and the back plate 4, the protective adhesive layers 2 can be made of EVA (ethylene vinyl acetate) or POE (polyolefin elastomer) and other hot melt adhesives, and photovoltaic modules which are sequentially of the light-transmitting plate 3, the protective adhesive layers 2, the cell string layer, the protective adhesive layers 2 and the back plate 4 are formed in a laminated structure from top to bottom through lamination; and the protective adhesive layer 2 can also play a protective role on the battery string layer, so that the battery piece 1 is prevented from being contacted with the light-transmitting plate 3 or the back plate 4 to generate hidden cracks.
The battery string provided by the embodiment of the application comprises a plurality of battery slices 1 and welding strips 5. The main grid 6 is arranged on the cell 1 along the first direction, the cell 1 is N sub-cells formed by cutting a cell substrate along the first direction, N is more than or equal to 2, compared with a large-size cell substrate, the area of the cut cell 1 is smaller, the current collected by the single cell 1 with a small area is small, so that the short-circuit current Isc of the cell 1 can be reduced, the rated current requirement of a junction box in a photovoltaic module is reduced, the performance requirement of a bypass diode is also reduced, the difficulty and risk of circuit design of the whole photovoltaic module are reduced, and the flexibility of photovoltaic module design can be greatly improved; and the output current of the small-area cell 1 is small, and the current circulating on the solder strip 5 is correspondingly reduced, so that the power loss of the photovoltaic module on the solder strip 5 is reduced, and the photovoltaic module is ensured to maintain higher power output.
A plurality of battery pieces 1 are arranged along first direction in proper order, and battery piece 1 includes that the individual layer is regional and stack the region, and adjacent battery piece 1 is stacking regional range upon range of placing, that is to say, each battery piece 1 is the form of covering tile and arranges to reduce the clearance between the battery piece 1, make the total area that N battery piece 1 occupy be not more than the area of battery substrate before the cutting, when guaranteeing subassembly output efficiency, improve the power plant site utilization ratio.
The welding strips 5 are correspondingly laid on the parallel main grids 6 of the battery pieces 1, and the welding strips 5 are connected with the front main grid of one battery piece 1 and the back main grid of the other battery piece 1 so as to connect the two adjacent battery pieces 1.
On this basis, adopt N after the piece, the battery area of every welding strip 5 both sides reduces for the electric current that flows through on single welding strip 5 reduces, that is to say, the current load who welds the area diminishes, thereby even make photovoltaic module dispose thinner welding strip 5, also can guarantee better current collection effect, consequently this embodiment cooperation superfine welding strip uses. The shielding of the welding strip 5 on the surface of the cell 1 can be reduced by adopting a thinner welding strip 5 (the thickness is less than 0.27 mm), the power generation power is improved, the gap between adjacent cells 1 along the thickness direction can be reduced, and the hidden crack risk is reduced; in addition, adopt thinner solder strip 5, can also further reduce the thickness of protection glue film, realize reduce cost's demand.
The adopted superfine welding strip is designed to comprise a light reflecting section 50 and a flat section 52, the light reflecting section 50 is positioned on the front surface of the battery piece 1 and is welded in a single-layer area, and light rays incident on the surface of the battery piece 1 can be efficiently reflected to the front surface of the battery piece 1 for full utilization while transmitting current, for example, the light reflecting section 50 can reflect the light rays incident on the surface of the battery piece to the light-transmitting plate 3 and then secondarily reflect the light rays to the surface of the battery piece 1 for secondary utilization; the flat section 52 is at least partially arranged in a stacking area between two stacked battery plates 1, that is, a part of the welding strip 5 corresponding to the stacking area is flat, so that the pressure deformation of the battery plates 1 after contacting the welding strip 5 is reduced, the gap between the stacking areas of two adjacent battery plates 1 in the thickness direction can be reduced, and the hidden cracking risk of the battery plates 1 in the stacking areas can be reduced.
It should be noted that, in the above embodiment, the battery with the main grid is taken as an example for description, in other embodiments, the battery sheet 1 may also be a battery without a main grid on the surface, and at this time, the welding strip may be directly welded to a preset welding point on the surface of the battery sheet to achieve connection with the battery sheet.
In some embodiments, the light reflecting section 50 can efficiently reflect light incident on the surface thereof to the front surface of the battery plate 1 for full utilization, and the cross section thereof can be in various shapes, such as triangle, trapezoid, circle or various polygonal shapes. The embodiment of the present application is described in detail by taking a circular solder strip as an example, and the circular solder strip 5 is used to connect two adjacent battery pieces 1.
Specifically, the diameter (thickness) of the light reflecting section 50 is 0.18mm to 0.27mm, for example, the diameter of the light reflecting section 50 may be 0.18mm, 0.19mm, 0.20mm, 0.21mm, 0.22mm, 0.23mm, 0.24mm, 0.25mm, or 0.27 mm; accordingly, the thickness of the flat section 52 is 0.08mm to 0.15mm, for example, the thickness of the flat section 52 may be 0.08mm, 0.09mm, 0.10mm, 0.11mm, 0.12mm, 0.13mm, 0.14mm, or 0.15mm, etc. The welding strip 5 with the structure can meet the current load requirement of the welding strip 5, ensures a higher current collection effect, can effectively reduce hidden cracks of the cell piece 1 caused by the lamination of the photovoltaic module, can reduce the shielding of the welding strip 5 on the surface of the cell piece 1, and improves the power generation power of the photovoltaic module. When the diameter of the light reflecting section 50 is smaller than 0.18mm, the welding strip 5 is too thin, so that the current load capacity of the welding strip 5 is too small, the welding strip is very easy to blow during use, and the normal collection of current is influenced; when the diameter of the light reflecting section 50 is larger than 0.27mm, the shielding area of the light reflecting section 50 on the surface of the cell 1 is large, so that the power generation power of the photovoltaic module is reduced, and when the diameter of the light reflecting section 50 is larger than 0.27mm, the gap between adjacent cells 1 along the thickness direction is increased, so that the cell 1 is hidden and cracked when the photovoltaic module is laminated.
Referring to the data in tables 1-3, the matching of the retroreflective segment 50 and the flat segment 52 is typically, but not limited to: the diameter of the light reflecting section 50 is 0.18mm, the thickness of the flat section 52 is 0.08mm, 0.1mm, 0.12mm or 0.15mm, the number of the hidden crack stripes can be not more than 2, and the power attenuation is not more than 0.90%; the diameter of the light reflecting section 50 is 0.2mm, the thickness of the flat section 52 is 0.08mm, 0.1mm, 0.12mm or 0.15mm, the number of the hidden crack stripes can be not more than 4, and the power attenuation is not more than 0.98%; the diameter of the light reflecting section 50 is 0.27mm, the thickness of the flat section 52 is 0.08mm, 0.1mm, 0.12mm or 0.15mm, the number of the hidden crack stripes is not more than 4, the power attenuation is not more than 1.00%, the power generation capacity and the quality grade of the prepared product are high, and the high-standard delivery requirement can be met. When the thickness of the flat section 52 is less than 0.08mm, on one hand, the process difficulty is high, and on the other hand, the flat section 52 is too thin and has excessive internal stress, so that the fracture and damage are easy to occur.
The length of the flat section 52 should be not less than the width of the overlapping area, so that the overlapping area can be completely contacted through the flat section 52, and hidden cracks caused by the fact that the flat section 52 and the battery piece 1 are overhead and laminated due to the fact that the light reflecting section 50 extends into the overlapping area are avoided.
Further, the ratio of the width of the flat section 52 to the diameter of the light reflecting section 50 is 150% to 250%, for example, the ratio of the width of the flat section 52 to the diameter of the light reflecting section 50 may be 150%, 160%, 170%, 180%, 190%, 200%, 210%, 220%, 230%, 240%, or 250%, etc., which not only can effectively increase the supporting area, but also does not cause the welding strip 5 to be crushed too much and to be broken due to internal stress. When the ratio of the width of the flat section 52 to the diameter of the light reflecting section 50 is less than 150%, the width of the flat section 52 is too small, so that the pressure between the welding strip 5 and the battery plate 1 is still large in the assembly laminating process, and hidden cracks are easy to occur; when the ratio of the width of the flat section 52 to the diameter of the light reflecting section 50 is greater than 250%, the flat section 52 is compressed too much, resulting in excessive internal stress of the flat section 52 and easy damage.
In some of these embodiments, the diameter of the retroreflective segment 50 is 0.18mm, the width of the flattened section 52 may be 0.34mm, and the ratio of the width of the flattened section 52 to the diameter of the retroreflective segment 50 is 186.25%; the diameter of the light reflecting section 50 is 0.2mm, the width of the flat section 52 can be 0.41mm, and the ratio of the width of the flat section 52 to the diameter of the light reflecting section 50 is 204.93%; the diameter of the light reflecting section 50 is 0.22mm, the width of the flat section 52 can be 0.40mm, and the ratio of the width of the flat section 52 to the diameter of the light reflecting section 50 is 182.54%; the diameter of the light reflecting section 50 is 0.25mm, the width of the flat section 52 can be 0.51mm, and the ratio of the width of the flat section 52 to the diameter of the light reflecting section 50 is 204.93%; the diameter of the reflector 50 is 0.26mm, the width of the flat section 52 may be 0.55mm, and the ratio of the width of the flat section 52 to the diameter of the reflector 50 is 212.46%.
Further, the length of the battery substrate in the first direction is 156mm to 220mm, for example, the length of the battery substrate in the first direction is 156mm, 160mm, 165mm, 170mm, 175mm, 180mm, 185mm, 190mm, 195mm, 200mm, 205mm, 210mm, 215mm, 220mm, and the like. Corresponding to the battery substrate with the specification, 9-20 welding strips 5 are arranged on the battery substrate side by side, and 9-20 welding strips on the battery substrate cut along the first direction are also obtained. For example, the number of solder strips 5 on the solar cell string may be 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, that is, the solar cell string provided in the present embodiment uses solder strips with a number greater than 9; and along with the increase of welding the area of taking 5 both sides of every welding, the battery area of every welding 5 both sides is littleer, and single welding 5 collection electric current is still less, electric load is less to adopt the superfine welding area in this embodiment also can guarantee to collect the electric current safely, and the effect of electric current collection is unchangeable.
In some embodiments, the length of the battery substrate along the first direction can be selected to be 156 mm-170 mm, and the number of solder strips on the battery piece is 10-16. In this case, the number of solder strips provided to the battery piece is correspondingly small. The optional thickness of the reflective section of the solder strip 5 under this condition is 0.20mm to 0.27 mm.
In other embodiments, the length of the battery substrate along the first direction can be selected to be 170 mm-180 mm, and the number of solder strips on the battery substrate is 12-18. In this case, the length of the battery substrate increases, and the number of solder ribbons to be provided is larger. When the number of the welding strips is increased, the area of the battery on two sides of each welding strip 5 is smaller, the current collected by each welding strip 5 is less, and the electric load is smaller, so that the thinner welding strip can be selected, and the thickness of the reflecting section can be selected to be 0.18 mm-0.27 mm.
In still other embodiments, the length of the battery substrate in the first direction may be optionally 180mm to 220mm, and in this case, the length of the battery substrate is larger, the number of solder ribbons to be provided is further increased, and the number of solder ribbons may be 13 to 20. When the number of the welding strips is more, the area of the battery on two sides of each welding strip 5 is relatively smaller, the electric load of each welding strip 5 is smaller, and the thickness of the reflecting section can be selected to be 0.18-0.27 mm.
Further, the thickness of the flat sections 52 is smaller than that of the battery pieces 1, so that the gaps between the battery pieces 1 are smaller than the thickness of the battery pieces 1, and the risk of subfissure of the battery pieces 1 in the overlapping area is reduced.
Further, the thickness of the battery sheet 1 is 0.1mm to 0.3mm, and for example, the thickness of the battery sheet 1 may be 0.1mm, 0.2mm, 0.3mm, or the like.
Further, the flat section includes body 520 and the changeover portion 522 of connecting body 520 and reflection of light section, and the thickness of changeover portion 522 increases gradually along the direction that body 520 points to the reflection of light section, and the side of changeover portion 522 width direction is for keeping away from the convex smooth transition's of changeover portion 522 arc shape, and the length of changeover portion 522 is 1mm ~ 3mm, and the length of body 520 is 3mm ~ 6 mm. The thickness change of the reflecting section and the flat section is severe, and the reflecting section is easy to bend, break and scrap when bearing the pressure in the thickness direction during lamination; and the light reflecting section is easy to extend into the stacking area, so that the battery pieces are hidden and cracked. The transition section 522 with proper length is arranged, so that the body 520 and the light reflecting section have proper natural transition distance and transition thickness, the transition section 522 protruding outwards increases the connecting area between the body 520 and the light reflecting section, and the two points can jointly act to avoid assembly scrap caused by fracture between the light reflecting section and the flat section in the lamination process of the assembly; and the length of the transition section 522 is 1 mm-3 mm, the length size of the body 520 is larger (3 mm-6 mm), and after the size design with specific length is adopted, the transition section 522 is positioned outside the stacking area, so that the influence on the stress of the stacking area is avoided, even if the transition section is extended into the stacking area due to process reasons, the thickness of the transition section 522 is gradually increased along the direction of the body 520 pointing to the light reflecting section, the stress influence on the battery piece in the stacking area is small, and the subfissure can be fully avoided.
Further, in the case of the transition section 522 including the body 520 and connecting the body 520 and the light reflecting section 50, the thickness increasing rate of the transition section 522 is gradually increased in a direction pointing to the light reflecting section 50 along the body 520. The thickness increase rate means: the transition section 522 increases in amount per unit length of movement in a direction along the body 520 toward the retroreflective section 50. After the arrangement is adopted, the change speed of the thickness of the part, close to the body 520, of the transition section 522 along the length direction of the welding strip is slower, and even if the thickness extends into the stacking area due to process control and the like, the stress of the battery pieces in the stacking area is hardly influenced, so that the hidden cracking can be fully avoided.
In some embodiments, the flat section 52 is further disposed on the back surface of the battery sheet 1 and welded to the single-layer area. In this embodiment, the solder strip is a two-stage design including a reflective section 50 and a flat section 52, has a simple structure, is easy to process and manufacture, and can be formed by flattening the solder strip on the back of the battery piece 1. Of course, the reflecting section 50 can be welded on the back surface of the cell 1, the light is reflected by the reflecting section 50 on the back surface and is recycled, and the welding strip in the form is particularly suitable for double-sided photovoltaic modules.
Further, the cross section of the flat section 52 is a waist-shaped surface, the waist-shaped surface is surrounded by plane areas arranged on two sides of the welding strip in the thickness direction and arc areas arranged on two sides of the width direction, the plane area in the center of the waist-shaped surface is contacted with the battery piece 1 to form a larger contact area, so that the pressure of the welding strip 5 on the whole battery piece 1 is reduced, two ends of the waist-shaped surface are arc areas, and sharp break angles are prevented from being formed on the welding strip 5, for example, some welding strips are arranged in a shaping groove in advance in production and processing, the cross section is rectangular after rapid flattening, and the parts of the two side areas, which are connected with the plane areas, form sharp angles and are unsmooth in transition, so that stress concentration is easily caused; the both sides of waist in this embodiment are the arc region, and the arc is more easily deformed, have the effect of buffering stress when bearing load, and the transition angle between arc region and the plane region is obtuse angle and smooth connection to the pressure when the battery piece contacts with the transition position of welding the area is less when the lamination, prevents to weld area 5 and produces too big pressure in the local region of battery piece 1, thereby effectively reduces the hidden risk of splitting that battery piece 1 exists in the overlap region.
Practical tests show that when the same solder strip 5 is flattened to the same thickness, the flattened cross sections are different, and the corresponding power attenuation and the number of hidden crack stripes are different, namely, the power attenuation and the number of hidden crack stripes of the solder strip in the photovoltaic module, which are waist-shaped surfaces, are obviously smaller than those of the photovoltaic module, which are rectangular surfaces, so that the cross sections of the solder strip are flattened and shaped into the waist-shaped surfaces, and the power attenuation and the number of hidden crack stripes of the photovoltaic module can be reduced.
Specifically, when the circular solder strip 5 is flattened, only the upper and lower surfaces of the solder strip 5 need to be pressed, so that the upper and lower surfaces of the solder strip 5 form a planar area; the left and right sides of the welding strip 5 do not need to be pressurized, and the left and right surfaces of the welding strip 5 form arc-shaped areas and are smoothly connected with the plane areas by controlling the lower pressurizing speed, so that the welding strip 5 is flattened into a waist-shaped surface. Or, a mold can be made in advance, the cavity of the mold is consistent with the outer contours of the reflecting section and the flat section, and the softened solder strip blank or the melted solder strip material is embedded into the mold to be cooled and then demoulded to form the solder strip with the required shape.
Further, after the solder strip 5 is flattened, along the length direction of the solder strip 5, the solder strip 5 may be of a broken line type (refer to fig. 3), that is, two planar regions of the flat section 52 are respectively tangent to one side of the adjacent two light-reflecting sections 50 facing the battery piece 1, so that the surfaces of the light-reflecting sections 50 and the flat section 52 on one side close to the battery piece 1 are aligned, when the adjacent two battery pieces 1 are connected by the solder strip 5, one planar region of the flat section 52 can be attached to the front side of the battery piece 1 along with the light-reflecting section 50 at one end, and the other planar region of the flat section 52 can be attached to the back side of the other battery piece 1 along with the light-reflecting section 50 at the other end, so that no gap is left between the flat section 52 and the battery piece 1, thereby reducing the gap between the adjacent two battery pieces 1 in the overlapping region as much as possible and reducing the risk of subfissure. In addition, because two plane areas of the flat section 52 can be attached to the surface of the battery piece 1, the solder strip 5 is not easy to deform in the lamination process, and the hidden crack risk is further reduced.
Further, the thickness of the tin layer of the light reflecting section 50 is 0.013mm to 0.018mm, for example, the thickness of the tin layer of the light reflecting section 50 may be 0.013mm, 0.014mm, 0.015mm, 0.016mm, 0.017mm, 0.018mm, and the like, which not only can meet the welding requirement between the solder strip 5 and the battery piece 1, but also can prevent the surface quality of the solder strip 5 from being affected by too large variation of the thickness of the tin layer on the surface of the solder strip during welding. When the thickness of the tin layer of the light reflecting section 50 is less than 0.013mm, the thickness of the tin layer on the surface of the welding strip 5 is too thin, so that the reliable connection between the welding strip 5 and the battery piece 1 is influenced; when the thickness of the tin layer of the light reflecting section 50 is greater than 0018mm, the thickness of the tin layer on the surface of the welding strip 5 is too thick, and during welding, the tin layer on the surface of the welding strip 5 is melted and flows, so that the tin layer is redistributed on the surface of the welding strip 5, the surface structure of the welding strip 5 is changed, an uneven concave-convex structure is formed, and the battery piece 1 is easily subjected to subfissure when being contacted with the uneven concave-convex structure.
Furthermore, the thickness of the tin layer in the plane area of the flat section 52 is larger than that in the arc area, and the thickness value is 0.009 mm-0.010 mm. The thickness of the tin layer in the plane area is at least larger than that of the tin layer in the arc area, so that the surface of the plane area can have enough tin, and the tin layer can be firmly connected with the main grid after being melted by high temperature during welding, thereby meeting the requirement of tin soldering. For example, the thickness of the tin layer of the flat section 52 may be 0.009mm, 0.0091mm, 0.0092mm, 0.0093mm, 0.0094mm, 0.0095mm, 0.0096mm, 0.0097mm, 0.0098mm, 0.0099mm, 0.010mm, etc., so as to reduce the thickness of the tin layer in the planar region of the flat section 52 as much as possible, thereby reducing the fluidity of the tin layer after melting in the welding heating, reducing the structural change, the unevenness and the change in the overall solder strip thickness of the surface of the solder strip 5 caused by the flow of the tin layer, and reducing the contact between the battery piece 1 and the uneven surface of the flat section 52 as much as possible, thereby reducing the risk of the battery piece 1 from being crazed; when the thickness of the tin layer of the flat section 52 is more than 0.010mm, the area still generates obvious tin layer flowing during welding, so that the plane area of the welding strip 5 generates a concave-convex structure, and the concave-convex structure is contacted with the battery piece to cause the hidden crack of the battery piece 1.
In some embodiments, for example, the thickness of the tin layer of the reflector section 50 is 0.015mm, and the tin layer thickness of the flat section 52 corresponding to the solder strips with different diameters is as follows: the diameter of the light reflecting section 50 is 0.18mm, and the thickness of the tin layer of the flat section 52 is 0.0102 mm; the diameter of the light reflecting section 50 is 0.2mm, and the thickness of the tin layer of the flat section 52 is 0.0096 mm; the diameter of the light reflecting section 50 is 0.22mm, and the thickness of the tin layer of the flat section 52 is 0.0105 mm; the diameter of the light reflecting section 50 is 0.25mm, and the thickness of the tin layer of the flat section 52 is 0.0097 mm; the diameter of the light reflecting section 50 is 0.27mm, and the thickness of the tin layer of the flat section 52 is 0.0095 mm.
Specifically, when a circular cross section is flattened into a waist-shaped surface, the cross sectional area of the solder ribbon 5 is not changed, but the circumference of the waist-shaped surface is larger than that of the circular cross section, so that the thickness of the tin layer on the surface can be reduced by flattening the solder ribbon 5, and the tin layer on the surface of the solder ribbon 5 is redistributed and concentrated towards the plane area in the flattening process.
In the embodiment of the utility model, the thickness of the tin layer is obtained by observing the solder strip under an electron microscope or an optical microscope after being cut.
To illustrate that the battery string of the embodiment of the present application has an effect of reducing the risk of subfissure, the circular solder strip and the solder strips flattened to different degrees are applied to the photovoltaic module for comparative experiments, and the results of the comparative experiments are shown in tables 1 to 3. In each experimental table, the photovoltaic modules of the respective sets of examples have the same parameters (thickness of the cell, type and thickness of the protective adhesive layer, etc.) except for different degrees of flattening of the solder strip, for example, the front panel is 3.2mm thick glass, the protective adhesive layer is 0.35mm thick EVA, the cell thickness is 0.18mm, the back panel thickness is 0.3mm, and the rest experimental conditions are also the same.
Wherein, what each sample number represented is a set of sample photovoltaic module, and its experimental result is the average value of reorganization sample photovoltaic module experimental result. The specific experimental method is as follows:
the mechanical load tests comprise static mechanical load tests and dynamic mechanical load tests according to the requirements of IEC 61215.
Static mechanical loading is typically repeated three times by applying 5400Pa to the front of the assembly for one hour, then inverting the assembly and applying 2400Pa for another hour. The appearance, IV and wet leakage performance of the assembly were tested after the test.
Dynamic mechanical load testing was performed by subjecting the assembly to 1000 alternating loading cycles at a pressure of 1000 Pa. Next, the assembly was placed in an environmental chamber, 50 thermal cycles (-40 ℃ to 85 ℃) were completed to allow microcrack propagation to occur, followed by 10 humidity freeze cycles (85 ℃ temperature and 85% relative humidity for 20 hours, then a rapid drop to-40 ℃) to stimulate potential corrosion.
After each step was performed, the assembly was characterized and visually inspected for any signs of failure. After the test, the appearance, IV (i.e., power test) and wet leakage performance of the assembly were tested.
TABLE 10.18 mm solder strip load test
TABLE 20.2 mm solder strip load test
TABLE 30.27 mm solder strip load test
Respectively drawing line graphs as shown in fig. 9-11 according to the data in tables 1-3, and according to the data in tables 1-3 and by combining fig. 9-11, it can be known that by flattening the solder strip, the power attenuation of the photovoltaic module can be reduced, and the number of hidden crack stripes generated by the cell can be reduced; the power attenuation of the photovoltaic module is gradually reduced along with the increase of the flattening degree of the solder strip, and the number of the hidden crack stripes of the cell is also gradually reduced; however, when the flattening degree of the solder strip is too large, the solder strip is further flattened, the line graph tends to be gentle, that is, the power attenuation and the hidden crack stripe number do not change obviously; therefore, the thickness range of the solder strip after being flattened in the embodiment is 29.6% -83.3% of the solder strip diameter.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (16)
1. A photovoltaic module comprising a string of cells, the string of cells comprising:
the battery pieces are formed by cutting battery substrates along a first direction, N is more than or equal to 2, the battery pieces are sequentially arranged along the first direction, each battery piece comprises a single layer area and a stacking area, and the adjacent battery pieces are stacked in the stacking area;
the welding strip is welded on the front face of one of the battery pieces and the back face of the other battery piece so as to connect the two adjacent battery pieces together, the welding strip comprises a light reflecting section and a flat section which are connected, the light reflecting section is positioned on the front face of the battery piece and welded on the single-layer area, at least part of the flat section is arranged in the stacking area between the two stacked battery pieces, the thickness of the light reflecting section is 0.18-0.27 mm, and the thickness of the flat section is 0.08-0.15 mm.
2. The photovoltaic assembly of claim 1, wherein the ratio of the width of the flattened section to the width of the light reflecting section is 150% to 250%.
3. The photovoltaic module according to claim 1, wherein the length of the cell substrate along the first direction is 156mm to 220mm, and 9 to 20 solder strips are arranged side by side on the cell substrate.
4. The photovoltaic module according to claim 3, wherein the length of the cell substrate along the first direction is 156mm to 170mm, and the number of solder strips on the cell sheet is 10 to 16.
5. The photovoltaic module of claim 4, wherein the light reflecting section has a thickness of 0.20mm to 0.27 mm.
6. The photovoltaic module according to claim 3, wherein the length of the cell substrate in the first direction is 170mm to 180mm, and the number of the solder ribbons on the cell substrate is 12 to 18.
7. The photovoltaic module according to claim 3, wherein the length of the cell substrate in the first direction is 180mm to 220mm, and the number of the solder ribbons on the cell substrate is 13 to 20.
8. The photovoltaic module of claim 1, wherein the thickness of the flattened section is less than the thickness of the cell sheet.
9. The photovoltaic module of claim 1, wherein the thickness of the cell sheet is 0.1mm to 0.3 mm.
10. The photovoltaic module according to any one of claims 1 to 9, wherein the flat section comprises a body and a transition section connecting the body and the light reflecting section, the thickness of the transition section gradually increases along a direction of the body toward the light reflecting section, the side edge of the transition section in the width direction is in a shape of a smoothly-transitional arc protruding in a direction away from the transition section, the length of the transition section is 1mm to 3mm, and the length of the body is 3mm to 6 mm.
11. The photovoltaic module of any one of claims 1-9, wherein the flat section comprises a body and a transition section connecting the body and the light reflecting section, the thickness of the transition section gradually increases along a direction from the body to the light reflecting section, and the thickness increasing rate of the transition section gradually increases along a direction from the body to the light reflecting section.
12. The assembly according to any one of claims 1 to 9, wherein the flat section is further disposed on the back side of the cell sheet and is welded to the single layer area.
13. The assembly according to any one of claims 1 to 9, wherein the cross section of the flat section is a waist-shaped surface, and the waist-shaped surface is defined by a plane area arranged on both sides of the thickness direction of the solder strip and an arc area arranged on both sides of the width direction of the solder strip.
14. The photovoltaic module of claim 13, wherein the thickness of the tin layer in the planar region of the flat section is greater than the thickness of the tin layer in the arcuate region and has a thickness value of 0.009mm to 0.010 mm.
15. A photovoltaic module according to any of claims 1 to 9 wherein the tin layer of the light-reflecting segments has a thickness of from 0.013mm to 0.018 mm.
16. The photovoltaic module of any of claims 1-9, further comprising:
the protective adhesive layers cover the surfaces of the front side and the back side of the battery string;
the light-transmitting plate covers the surface of the protective adhesive layer on the front surface of the battery string;
the back plate covers the surface of the protective glue layer on the back of the battery string.
Priority Applications (10)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121625350.9U CN215815898U (en) | 2021-07-16 | 2021-07-16 | Photovoltaic module |
| AU2021221523A AU2021221523B1 (en) | 2021-07-16 | 2021-08-24 | Photovoltaic module |
| EP21192997.1A EP4120368B1 (en) | 2021-07-16 | 2021-08-25 | Photovoltaic module |
| JP2021137416A JP7195389B1 (en) | 2021-07-16 | 2021-08-25 | photovoltaic assembly |
| EP23203562.6A EP4283686A3 (en) | 2021-07-16 | 2021-08-25 | Photovoltaic module |
| ATGM84/2021U AT17481U3 (en) | 2021-07-16 | 2021-08-26 | photovoltaic module |
| US17/459,614 US11721776B2 (en) | 2021-07-16 | 2021-08-27 | Photovoltaic module |
| JP2022196548A JP7506730B2 (en) | 2021-07-16 | 2022-12-08 | Photovoltaic Assembly |
| AU2023200126A AU2023200126A1 (en) | 2021-07-16 | 2023-01-11 | Photovoltaic module |
| US18/209,622 US20230352610A1 (en) | 2021-07-16 | 2023-06-14 | Photovoltaic module |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202121625350.9U CN215815898U (en) | 2021-07-16 | 2021-07-16 | Photovoltaic module |
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| CN215815898U true CN215815898U (en) | 2022-02-11 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115799366A (en) * | 2022-11-18 | 2023-03-14 | 江苏悦阳光伏科技有限公司 | High-power solar module |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111933735B (en) * | 2020-08-06 | 2024-03-29 | 中节能太阳能科技（镇江）有限公司 | Welding strip for laminated photovoltaic module and laminated photovoltaic module |
-
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- 2021-07-16 CN CN202121625350.9U patent/CN215815898U/en active Active
- 2021-08-26 AT ATGM84/2021U patent/AT17481U3/en unknown
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115799366A (en) * | 2022-11-18 | 2023-03-14 | 江苏悦阳光伏科技有限公司 | High-power solar module |
| CN115799366B (en) * | 2022-11-18 | 2023-10-20 | 江苏悦阳光伏科技有限公司 | Solar energy component |
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| AT17481U2 (en) | 2022-06-15 |
| AT17481U3 (en) | 2023-03-15 |
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