CN215418199U - Solar cell string and photovoltaic module comprising same - Google Patents
Solar cell string and photovoltaic module comprising same Download PDFInfo
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- CN215418199U CN215418199U CN202121735165.5U CN202121735165U CN215418199U CN 215418199 U CN215418199 U CN 215418199U CN 202121735165 U CN202121735165 U CN 202121735165U CN 215418199 U CN215418199 U CN 215418199U
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- 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
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- 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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The utility model provides a solar cell string and a photovoltaic module comprising the same. The solar cell string comprises solar cells and welding strips connected with the solar cells in series, the welding strips are bonded on the surfaces of the solar cells through double-sided transparent adhesive tapes, the double-sided transparent adhesive tapes are located between the welding strips and the solar cells, the positions of the double-sided transparent adhesive tapes are placed on the solar cells, and short grid lines in different directions with the auxiliary grid lines are arranged. According to the utility model, the welding strip can be easily bonded to the solar cell through the double-sided transparent adhesive tape, the pad points of the original welding are replaced, the silver paste consumption is reduced, the shading loss is reduced, and partial accessories can be changed on the existing welding machine; the transmittance of the adhesive tape is greater than 50%, sunlight entering the area below the adhesive tape is not affected, the short transverse lines are used for guiding out photogenerated current generated in the area below the adhesive tape to be close to the grid lines, the adhesive tape and the welding strips do not need to be combined firstly, and the preparation process is greatly simplified.
Description
Technical Field
The utility model belongs to the technical field of solar cells, relates to a solar cell string and a photovoltaic module comprising the solar cell string, and particularly relates to a solar cell string without a main grid and a photovoltaic module comprising the solar cell string.
Background
In the field of a solar cell without a main grid, the thin grid line is completely used for current collection, and the problems of series resistance rise, fill factor reduction and the like are encountered, so that the power of the manufactured assembly is seriously reduced; the series resistance is reduced by screen printing of wider silver paste grid lines, but the cost is increased sharply due to the increase of the silver consumption, and meanwhile, the problems that the insulation effect between P and N is poor and the electric leakage is easy to occur are caused by the wider grid lines.
In the solar cell industry, several individual silicon cells need to be connected together in series by solder ribbons in order to draw out the current generated by all the silicon cells. One end of the welding strip is welded with the front main grid of the front side silicon battery piece, and the other end of the welding strip is welded with the back main grid of the back side silicon battery piece. The thickness of the existing silicon battery is in a thinning trend, and the hidden crack is more easily generated by adopting a welding strip connection mode. The way in which the solder strips are attached is thus increasingly restricted.
When the solar cells are connected in series by using the strip-shaped solder strip to form the cell string, the solder strip is directly contacted with the EVA outside the tape (or the tape-shaped adhesive film), so that the EVA (Ethylene Vinyl Acetate Copolymer) melts and has fluidity during lamination, and the EVA may insulate the solder strip from the fine grid during lamination.
The application of screen printed bus bars is improved, preferably by avoiding bus bars entirely. However, the technical difficulty of completely avoiding the main grid line lies in how to connect the batteries in series, and at present, there is also a polymer adhesive film provided in the prior art, in which the adhesive film is firstly adhered to the wires, then placed on the batteries, and finally laminated together. The technology can completely avoid the use of the main grid line, but the adhesive film needs a special structure, is adhered with the lead and then fixed with the battery, and increases the process complexity.
CN100431175A discloses an electrode comprising a flat surface transparent electrically insulating optical film, an adhesive applied to the flat surface and parallel wires embedded in the adhesive layer, the adhesive having a thickness less than the wire thickness, whereby the protrusions form ohmic contacts with the photovoltaic element.
CN108419433A discloses a polymer conductor plate, a solar cell and a method for producing the same, wherein a homogeneous polymer plate is processed by heat, radiation, chemistry, etc. to form a two-layer or three-layer region, wherein the first region has a low degree of crosslinking or polymerization and is heat adhesive, the second region has a high degree of crosslinking or polymerization and is a support layer, the third layer has a lower degree of crosslinking or polymerization, and a plurality of sets of parallel wires are adhered to the first region to form a polymer plate, thereby forming a cell string.
As a person skilled in the art, the three names of the polymer adhesive films are that the adhesive film is bonded with a lead, and then welding is achieved during lamination to achieve electrical contact, however, in all of the three methods, a polymer adhesive film material processing platform, a bonding platform of an adhesive film material and a lead, and the like must be additionally added, which undoubtedly increases the cost and increases the complexity. In addition, the adhesive films, namely the bonding layers, provided by the three methods are all arranged on the layer of the metal lead far away from the solar cell, and are fully covered, so that the transparency and the stability of the adhesive films have high requirements.
Therefore, how to adjust the connection mode of the solder strip, and simultaneously avoid the shading of the solar cell main grid line and the large silver consumption amount is a technical problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a solar cell string and a photovoltaic module comprising the same. According to the utility model, the welding strip and the solar cell are connected through the double-sided transparent adhesive tape, and the special grid line design is matched, so that the welding strip can be easily adhered to the solar cell, original welding pad points (metal welding points) are replaced, a solar cell string is formed, the silver paste consumption is reduced, the shading loss is reduced, partial accessories can be changed on the existing welding machine, and the method is simple and convenient; the adhesive tape is positioned between the solder strip and the battery, so that the conduction of the photovoltaic current of the solar cell below the adhesive tape is not influenced, the adhesive tape and the solder strip are not required to be combined, and the preparation process is greatly simplified.
In order to achieve the purpose of the utility model, the utility model adopts the following technical scheme:
in a first aspect, the utility model provides a solar cell string, which comprises a solar cell and a welding strip connected with the solar cell in series, wherein the welding strip is bonded on the surface of the solar cell through a double-sided transparent adhesive tape, the double-sided transparent adhesive tape is positioned between the welding strip and the solar cell, and short grid lines in different directions from auxiliary grid lines are arranged at positions where the double-sided transparent adhesive tape is placed in the solar cell.
The solar cell string provided by the utility model is a string assembly structure formed by connecting a plurality of groups of cells in series through welding strips in an end-to-end manner, the connection mode is that the positive electrode of the front cell is connected with the negative electrode of the rear cell, namely the connection of the positive electrode and the negative electrode in an alternating manner, the provided welding strips are lead wires connected among the cells, the welding strips are sectional welding strips, the length of the welding strips is more than or equal to 2 times of the length of the solar cell, one side of each welding strip is tightly contacted with the front surface of one solar cell, and one side of each welding strip is contacted with the back surface of the adjacent solar cell, and the welding strips are sequentially connected, so that the solar cell string can be formed.
In the present invention, the tape-shaped adhesive tape does not affect the light absorption of the battery, and therefore, the tape-shaped adhesive tape may be a conductive adhesive tape or a non-conductive adhesive tape in order to have a transparent property and to have no specific requirement on the conductivity of the tape.
In a solar cell, a grid line, i.e., an electrode, functions to lead out a current generated from the solar cell, and generally, a grid line (electrode) of a solar cell is formed by screen printing and then sintering, and has a composition of a plurality of single lines parallel to each other with the same pitch. The battery string provided by the utility model is a battery string without a main grid, namely only the auxiliary grid line is provided, and the main grid line is not provided.
According to the solar cell module, when the double-sided transparent adhesive tape is positioned between the solar cell and the welding strip, the grid lines at the lower edge of the welding strip are insulated from the welding strip (wire) due to the insertion of the middle adhesive tape, so that the current generated in the area below the adhesive tape cannot be led out, the design that a plurality of single grid lines are parallel to each other is broken through the matching of special short grid lines, and even if the adhesive tape exists, the short grid lines in different directions from the auxiliary grid lines are designed, the current can be led out to the adjacent auxiliary grid lines and then transmitted to the welding strip (wire), so that the insulation is avoided.
The double-sided transparent adhesive tape provided by the utility model is positioned in the area of the short grid line, the position of the adhesive tape is not specially limited, and only the solder strip and the solar cell piece can be tightly bonded together.
According to the utility model, the welding strip and the solar cell are connected through the double-sided transparent adhesive tape, and the special grid line design is matched, so that the welding strip can be easily adhered to the solar cell, original welding pad points (metal welding points) are replaced, a solar cell string is formed, the silver paste consumption is reduced, the shading loss is reduced, partial accessories can be changed on the existing welding machine, and the method is simple and convenient; the adhesive tape is positioned between the solder strip and the battery, so that the conduction of the photovoltaic current of the solar cell below the adhesive tape is not influenced, the adhesive tape and the solder strip are not required to be combined, and the preparation process is greatly simplified.
In a preferred embodiment of the present invention, the double-sided scotch tape has a transmittance of > 50%, for example, 51%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
The transmittance of the double-sided transparent adhesive tape provided by the utility model is the transmittance after lamination when the solar cell string is applied to a photovoltaic module.
In the utility model, if the transmittance of the double-sided transparent adhesive tape is too low, shading loss is caused, and the power generation efficiency is influenced.
As a preferable technical scheme of the utility model, the double-sided transparent adhesive tape is arranged along the vertical direction of the parallel direction of the welding tapes.
As a preferred embodiment of the present invention, the direction of the short gate line is perpendicular to the direction of the parallel secondary gate line.
In a preferred embodiment of the present invention, the width of the double-sided transparent adhesive tape is 0.1 to 30mm, for example, 0.1mm, 1mm, 5mm, 10mm, 15mm, 20mm, 25mm or 30mm, but the width is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
In a preferred embodiment of the present invention, the number of the double-sided transparent adhesive tape is not less than 2, for example, 2, 3, 4, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15 or 20, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
The number of the double-sided transparent adhesive tapes indicated by the utility model refers to the number of the adhesive tapes in each solar cell piece in the solar cell string, and the number of the adhesive tapes can also be understood as the number of rows or columns of the adhesive tapes on the solar cell pieces. The number of the adhesive tapes is matched with the width of the adhesive tapes, the width is narrow, and the adhesive tapes can be arranged in a large number of adaptability.
In a preferred embodiment of the present invention, the number of the solder strips is not less than 1, for example, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 15, 20, 25, 30 or 35, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
As a preferable technical scheme of the utility model, the welding strip comprises a lead and a coating layer coated on the surface of the lead.
In the present invention, the number of wires is inversely related to the size so as not to increase the series resistance, and the number of wires is required to be larger as the wires are thinner.
In a preferred embodiment of the present invention, the diameter of the conductive wire is 0.1 to 400 μm, for example, 0.1 μm, 1, 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, 150 μm, 200 μm, 250 μm, 300 μm, 350 μm, or 400 μm, but the present invention is not limited to the above-mentioned values, and other values not listed in the above-mentioned range are also applicable.
Further, as a preferable embodiment of the present invention, the diameter of the conductive wire is 100 to 300 μm, for example, 100 μm, 150 μm, 200 μm, 250 μm, or 300 μm, but is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
As a preferred embodiment of the present invention, the coating comprises a single metal coating or an alloy coating.
In the utility model, the coating in the solder strip plays a role in welding with the grid line of the solar cell, so that different wrapping layers are used for corresponding to different welding temperatures, and the laminating temperature is further influenced.
In a preferred embodiment of the present invention, the alloy coating has a melting point of 50 to 200 ℃, for example, 50 ℃, 60 ℃, 70 ℃, 80 ℃, 90 ℃, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃, 160 ℃, 170 ℃, 180 ℃, 190 ℃ or 200 ℃, but is not limited to the recited values, and other values not recited in the above range are also applicable.
Further, the melting point of the alloy coating is 100 to 160 ℃, for example, 100 ℃, 110 ℃, 120 ℃, 130 ℃, 140 ℃, 150 ℃ or 160 ℃, but is not limited to the recited values, and other values not recited in the numerical range are also applicable.
In the utility model, the alloy coating with the melting point of 120-160 ℃ is selected to be suitable for the lamination temperature in the subsequent preparation of the photovoltaic module, and in the lamination process, when the melting point temperature of the alloy coating is lower than the lamination temperature, the alloy coating can be melted, flows downwards along a lead, and is converged at the grid line of the solar cell, so that the cooling welding is realized. The main body part of the lead can be a copper wire or other wires with good conductivity, and the copper wire is preferred.
As a preferred technical solution of the present invention, the length of the short gate line is greater than the width of the double-sided transparent adhesive tape.
According to the utility model, the length of the short grid line is ensured to be larger than the width of the double-sided transparent adhesive tape, so that the condition that the welding strip and the auxiliary grid line vertical to the welding strip are insulated by the adhesive tape can not occur.
As a preferred technical solution of the present invention, the material of the short gate line and the material of the sub-gate line are kept the same.
As a preferred technical solution of the present invention, a pasting area of the double-sided transparent adhesive tape is smaller than an area of the short gate line.
In a second aspect, the utility model further provides a photovoltaic module, which includes a first glass, a first adhesive film, the solar cell string according to the first aspect, a second adhesive film, and a second glass, which are sequentially stacked.
As a preferred embodiment of the present invention, a third adhesive film is disposed between the first adhesive film and the solar cell string according to the first aspect.
As a preferred embodiment of the present invention, a fourth adhesive film is disposed between the solar cell string and the second adhesive film according to the first aspect.
In the utility model, on the basis of the original adhesive film, a new adhesive film is further added for covering, the purpose of covering is to avoid the direct contact between the battery and the first adhesive film and the second adhesive film, and meanwhile, the third adhesive film and the fourth adhesive film are thinner, so that the first adhesive film and the second adhesive film are not hindered to fill gaps, and the electrical contact can be improved, because the first adhesive film and the second adhesive film have strong fluidity at the laminating temperature. The condition of insulating solder strip and grid line of first and second glued membrane that has avoided the lamination in-process to appear.
In a preferred embodiment of the present invention, the third adhesive film and the fourth adhesive film have a thickness of 0.1 to 100 μm, for example, 0.1 μm, 1 μm, 5 μm, 10 μm, 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, or 100 μm, respectively, but the thickness is not limited to the above-mentioned values, and other values not listed in the above-mentioned value range are also applicable.
Illustratively, the present invention provides a method of manufacturing a solar cell string according to the first aspect, the method comprising:
arranging short grid lines perpendicular to the parallel direction of the auxiliary grid lines at the positions of the solar cell pieces where the double-sided transparent adhesive tapes are placed, then adhering the double-sided transparent adhesive tapes to the surfaces of the solar cell pieces along the parallel direction of the auxiliary grid lines, placing welding tapes on the surfaces of the double-sided transparent adhesive tapes, and connecting the solar cell pieces in series through the welding tapes to obtain the solar cell string; and after the welding strip is placed on the surface of the double-sided transparent adhesive tape, applying pressure to the welding strip.
Compared with the prior art, the utility model has the following beneficial effects:
according to the utility model, the welding strip and the solar cell are connected through the double-sided transparent adhesive tape, and the special grid line design is matched, so that the welding strip can be easily adhered to the solar cell, original welding pad points (metal welding points) are replaced, a solar cell string is formed, the silver paste consumption is reduced, the shading loss is reduced, partial accessories can be changed on the existing welding machine, and the method is simple and convenient; the adhesive tape is positioned between the solder strip and the battery, so that the conduction of the photovoltaic current of the solar cell below the adhesive tape is not influenced, the adhesive tape and the solder strip are not required to be combined, and the preparation process is greatly simplified.
Drawings
Fig. 1 is a schematic structural diagram of a single solar cell in a solar cell string according to an embodiment.
Fig. 2 is a partial schematic illustration of a side view of a solar cell string provided in an embodiment.
Fig. 3 is a schematic structural diagram of a solar cell string according to an embodiment.
1-solar cell, 2-solder strip, 3-double-sided transparent adhesive tape and 4-short grid line.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, wherein like or similar reference numerals refer to like or similar parts or parts having like or similar functions throughout. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the utility model and are not to be construed as limiting the utility model.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "mounted" are to be construed broadly, e.g., as meaning both connected and disconnectable, mechanically and electrically, directly or indirectly via intermediate media, whether internal or external to the elements, or in any other relationship between the elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature being in contact not directly but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical solution of the present invention is further explained by the following embodiments. It should be understood by those skilled in the art that the examples are only for the understanding of the present invention and should not be construed as the specific limitations of the present invention.
In a specific embodiment, the utility model provides a solar cell string (as shown in fig. 3) and a preparation method thereof, as shown in fig. 1, the solar cell string comprises a solar cell sheet 1 and a solder strip 2 connected in series with the solar cell sheet 1, the solder strip 2 is bonded to the surface of the solar cell sheet 1 (as shown in fig. 2) through a double-sided transparent adhesive tape 3, the double-sided transparent adhesive tape 3 is located between the solder strip 2 and the solar cell sheet 1, short grid lines 4 in different directions from the minor grid lines are arranged at positions where the double-sided transparent adhesive tape 3 is placed in the solar cell sheet 1, and further, the directions of the short grid lines 4 are perpendicular to the directions parallel to the minor grid lines.
The transmittance of the double-sided transparent adhesive tape 3 is more than 50 percent; the double-sided transparent adhesive tape 3 is arranged along the vertical direction of the parallel direction of the welding strip 2, and the width of the double-sided transparent adhesive tape 3 is 0.1-30 mm; the number of the double-sided transparent adhesive tapes 3 is more than or equal to 2.
The number of the welding strips 2 is more than or equal to 1; the welding strip 2 comprises a lead and a coating coated on the surface of the lead; the diameter of the wire is 0.1 to 400 μm, and further 100 to 300 μm; the coating comprises a single metal coating and/or an alloy coating; the melting point of the alloy coating is 50-200 ℃, and further 100-160 ℃.
The length of the short grid lines 4 is greater than the width of the double-sided transparent adhesive tape 3; the material of the short grid lines 4 is consistent with that of the secondary grid lines; the pasting area of the double-sided transparent adhesive tape 3 is smaller than the area of the short grid lines 4.
The preparation method comprises the following steps:
short grid lines 4 perpendicular to the parallel direction of the auxiliary grid lines are arranged at the positions, where the double-sided transparent adhesive tapes 3 are placed, of the solar cell pieces 1, then the double-sided transparent adhesive tapes 3 are pasted on the surfaces of the solar cell pieces 1 along the parallel direction of the auxiliary grid lines, the welding tapes 2 are placed on the surfaces of the double-sided transparent adhesive tapes 3, pressure is applied to the welding tapes 2, and the solar cell pieces 1 are connected in series through the welding tapes 2, so that the solar cell string is obtained.
In another embodiment, the utility model provides a photovoltaic module, which includes a first glass, a first adhesive film, a solar cell string, a second adhesive film and a second glass, which are sequentially stacked.
A third adhesive film is arranged between the first adhesive film and the solar cell string provided by the above embodiment;
a fourth adhesive film is arranged between the solar cell string and the second adhesive film;
the thickness of the third adhesive film and the thickness of the fourth adhesive film are 0.1-100 μm respectively.
Example 1
The embodiment provides a solar cell string and a preparation method thereof, and based on the solar cell string and the preparation method thereof provided in the specific embodiment, the solar cell string comprises the following steps:
wherein, the transmittance of the double-sided transparent adhesive tape 3 is 88%; the width of the double-sided transparent adhesive tape 3 is 3 mm; the number of the double-sided transparent adhesive tapes 3 was 10.
The number of the welding strips 2 is 18; the welding strip 2 comprises a lead and a coating coated on the surface of the lead; the diameter of the wire is 260 μm; the coating is an alloy coating; the melting point of the alloy coating is 120 ℃; the length of the short grid lines 4 is 5 mm.
The embodiment further provides a photovoltaic module, based on the photovoltaic module provided in the specific embodiment:
wherein the thickness of the third adhesive film and the fourth adhesive film is 50 μm.
Example 2
The embodiment provides a solar cell string and a preparation method thereof, and based on the solar cell string and the preparation method thereof provided in the specific embodiment, the solar cell string comprises the following steps:
wherein, the transmittance of the double-sided transparent adhesive tape 3 is 90 percent; the width of the double-sided transparent adhesive tape 3 is 4 mm; the number of the double-sided transparent adhesive tapes 3 is 8.
The number of the welding strips 2 is 20; the welding strip 2 comprises a lead and a coating coated on the surface of the lead; the diameter of the wire is 240 μm; the coating is an alloy coating; the melting point of the alloy coating is 125 ℃; the length of the stub wire 4 is 8 mm.
The embodiment further provides a photovoltaic module, based on the photovoltaic module provided in the specific embodiment:
wherein the thickness of the third adhesive film and the fourth adhesive film is 80 μm.
Example 3
The embodiment provides a solar cell string and a preparation method thereof, and based on the solar cell string and the preparation method thereof provided in the specific embodiment, the solar cell string comprises the following steps:
wherein, the transmittance of the double-sided transparent adhesive tape 3 is 91%; the width of the double-sided transparent adhesive tape 3 is 5 mm; the number of the double-sided transparent adhesive tapes 3 was 6.
The number of the welding strips 2 is 24; the welding strip 2 comprises a lead and a coating coated on the surface of the lead; the diameter of the wire is 180 μm; the coating is an alloy coating; the melting point of the alloy coating is 130 ℃, and the length of the short grid line 4 is 7 mm.
The embodiment further provides a photovoltaic module, based on the photovoltaic module provided in the specific embodiment:
wherein the thickness of the third adhesive film and the fourth adhesive film is 10 μm.
Example 4
The embodiment provides a solar cell string and a preparation method thereof, and based on the solar cell string and the preparation method thereof provided in the specific embodiment, the solar cell string comprises the following steps:
wherein, the transmittance of the double-sided transparent adhesive tape 3 is 92%; the width of the double-sided transparent adhesive tape 3 is 7 mm; the number of the double-sided transparent adhesive tapes 3 was 5.
The number of the welding strips 2 is 30; the welding strip 2 comprises a lead and a coating coated on the surface of the lead; the diameter of the wire is 140 μm; the coating is an alloy coating; the melting point of the alloy coating is 140 ℃; the length of the stub wire 4 is 9 mm.
The embodiment further provides a photovoltaic module, based on the photovoltaic module provided in the specific embodiment:
wherein the thickness of the third adhesive film and the fourth adhesive film is 20 μm.
According to the utility model, the welding strip and the solar cell are connected through the double-sided transparent adhesive tape, and the special grid line design is matched, so that the welding strip can be easily adhered to the solar cell, original welding pad points (metal welding points) are replaced, a solar cell string is formed, the silver paste consumption is reduced, the shading loss is reduced, partial accessories can be changed on the existing welding machine, and the method is simple and convenient; the adhesive tape is positioned between the solder strip and the battery, so that the conduction of the photovoltaic current of the solar cell below the adhesive tape is not influenced, the adhesive tape and the solder strip are not required to be combined, and the preparation process is greatly simplified.
The applicant declares that the above description is only a specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and it should be understood by those skilled in the art that any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are within the scope and disclosure of the present invention.
Claims (10)
1. The solar cell string is characterized by comprising solar cells and welding strips connected with the solar cells in series, wherein the welding strips are bonded on the surfaces of the solar cells through double-sided transparent adhesive tapes, the double-sided transparent adhesive tapes are located between the welding strips and the solar cells, and short grid lines in different directions from auxiliary grid lines are arranged at positions where the double-sided transparent adhesive tapes are placed in the solar cells.
2. The solar cell string according to claim 1, wherein the double-sided scotch tape has a transmittance of > 50%;
the double-sided transparent adhesive tape is arranged along the vertical direction of the parallel direction of the welding tapes;
the direction of the short grid line is perpendicular to the direction parallel to the auxiliary grid line.
3. The solar cell string according to claim 1, wherein the width of the double-sided transparent adhesive tape is 0.1-30 mm.
4. The solar cell string according to claim 1, wherein the number of the double-sided transparent adhesive tapes is greater than or equal to 2.
5. The solar cell string according to claim 1, wherein the number of solder strips is greater than or equal to 1.
6. The solar cell string as claimed in claim 1, wherein the solder ribbon comprises a conductive wire and a coating layer covering the surface of the conductive wire.
7. The solar cell string according to claim 6, wherein the diameter of the lead is 0.1 to 400 μm;
the diameter of the lead is 100-300 mu m;
the coating comprises a single metal coating or an alloy coating;
the melting point of the alloy coating is 50-200 ℃;
the melting point of the alloy coating is 100-160 ℃.
8. The string of solar cells of claim 1, wherein the length of the stub grid line is greater than the width of the double-sided scotch tape.
9. The solar cell string according to claim 1, wherein the double-sided transparent adhesive tape has a smaller pasting area than an area of the short gate line.
10. A photovoltaic module, characterized in that the photovoltaic module comprises a first glass, a first adhesive film, the solar cell string according to any one of claims 1 to 9, a second adhesive film and a second glass which are sequentially stacked;
a third adhesive film is arranged between the first adhesive film and the solar cell string as set forth in any one of claims 1 to 9;
a fourth adhesive film is arranged between the solar cell string as claimed in any one of claims 1 to 9 and the second adhesive film;
the thickness of the third adhesive film and the thickness of the fourth adhesive film are respectively 0.1-100 mu m.
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| CN202121735165.5U CN215418199U (en) | 2021-07-28 | 2021-07-28 | Solar cell string and photovoltaic module comprising same |
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| CN202121735165.5U CN215418199U (en) | 2021-07-28 | 2021-07-28 | Solar cell string and photovoltaic module comprising same |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114899274A (en) * | 2022-04-13 | 2022-08-12 | 高瑞 | Batch series processing technology for photovoltaic module thin sheet battery pieces |
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2021
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114899274A (en) * | 2022-04-13 | 2022-08-12 | 高瑞 | Batch series processing technology for photovoltaic module thin sheet battery pieces |
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Effective date of registration: 20230802 Address after: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu Patentee after: TRINA SOLAR Co.,Ltd. Patentee after: TRINA SOLAR( CHANGZHOU) TECHNOLOGY Co.,Ltd. Address before: 213031 Tianhe PV Industrial Park No. 2, Xinbei District, Changzhou, Jiangsu Patentee before: TRINA SOLAR Co.,Ltd. |