CN116504863A - Full-black back contact solar cell module and preparation method thereof - Google Patents
Full-black back contact solar cell module and preparation method thereof Download PDFInfo
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- CN116504863A CN116504863A CN202310771276.9A CN202310771276A CN116504863A CN 116504863 A CN116504863 A CN 116504863A CN 202310771276 A CN202310771276 A CN 202310771276A CN 116504863 A CN116504863 A CN 116504863A
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- 238000002360 preparation method Methods 0.000 title abstract description 8
- 241000269913 Pseudopleuronectes americanus Species 0.000 claims abstract description 3
- 238000003466 welding Methods 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 11
- 239000011810 insulating material Substances 0.000 claims description 7
- 239000002002 slurry Substances 0.000 claims description 7
- 239000002313 adhesive film Substances 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 229910000679 solder Inorganic materials 0.000 claims description 3
- 238000006243 chemical reaction Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 238000004904 shortening Methods 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 11
- 238000010276 construction Methods 0.000 description 4
- 230000007547 defect Effects 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 101001073212 Arabidopsis thaliana Peroxidase 33 Proteins 0.000 description 1
- 101001123325 Homo sapiens Peroxisome proliferator-activated receptor gamma coactivator 1-beta Proteins 0.000 description 1
- 102100028961 Peroxisome proliferator-activated receptor gamma coactivator 1-beta Human genes 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012827 research and development Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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
- H01L31/0516—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 specially adapted for interconnection of back-contact solar cells
-
- 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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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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- Condensed Matter Physics & Semiconductors (AREA)
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- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Manufacturing & Machinery (AREA)
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Abstract
The invention provides a full black back contact solar cell module and a preparation method thereof, comprising the following steps: a plurality of strings of back contact solar cell strings spliced together; the back contact solar cell string comprises a plurality of string back contact solar cell units spliced together; the back contact solar cell unit comprises at least two back contact solar cells spliced together; and a bus belt with the thickness of 0.12-0.20 mm is welded between two adjacent strings of back contact solar battery strings, and the bus belt is used for connecting and outputting electric energy generated by the two adjacent strings of back contact solar battery strings. The full-black back contact solar cell module provided by the invention has full-black appearance, high power and high density, and simultaneously improves the power density of the cell module by reducing the white reserved inside the cell module and shortening the long side size, improves the conversion efficiency of the cell module, improves the consistency of the appearance of the cell module by adopting an ultrathin sectional converging belt, and realizes the full-black appearance effect.
Description
Technical Field
The invention belongs to the technical field of battery packs, and particularly relates to a full-black back contact solar cell module and a preparation method thereof.
Background
The distributed photovoltaic power station is a project of current important construction, and along with the wide use of photovoltaic battery components, the defects of the existing back contact solar battery products are gradually exposed in the project construction process, and mainly the problems of white reserved in the middle of the appearance of the battery and low power density and conversion efficiency caused by overlarge battery size are solved. These problems affect the optimal matching and final yield of the distributed photovoltaic power station and the building, and place more stringent requirements on the appearance consistency, the excellent electrical performance, the long-term safety and reliability and the like on the photovoltaic cell assembly.
Therefore, how to improve the battery conversion efficiency is the main research and development direction of the photovoltaic cell assembly for the construction of the distributed photovoltaic power station at present.
Disclosure of Invention
In view of the above, the present invention provides an all-black back contact solar cell module and a method for manufacturing the same, which can reduce the size of the cell to improve the power density and the conversion efficiency by providing a bus bar, so as to solve the technical defects mentioned in the background art.
To achieve the above object, the present invention provides an all-black back contact solar cell module, comprising:
a plurality of strings of back contact solar cell strings spliced together;
the back contact solar cell string comprises a plurality of back contact solar cell units spliced together;
the back contact solar cell unit comprises at least two back contact solar cells spliced together; wherein,,
and a bus belt with the thickness of 0.12-0.20 mm is welded between two adjacent strings of back contact solar battery strings, and the bus belt is used for connecting and outputting electric energy generated by the two adjacent strings of back contact solar battery strings.
Further, the head and tail parts of the back contact solar cell string are provided with a positive electrode grid line and a negative electrode grid
And the back of the head battery and the back of the tail battery of the back contact solar battery string are provided with insulating layers, and the bus strap is arranged on the insulating layers and is isolated from the positive grid line and the negative grid line so as to avoid short circuit.
Further, the back contact solar cell string is connected end to end when adjacent to the back contact solar cell string.
Further, the width of the insulating layer is 1.2 to 1.5 times the width of the bus bar.
Further, the back contact solar cell assembly is a full black appearance.
Further, bypass diodes are arranged in parallel between two adjacent back contact solar cell strings.
A method of making an all-black back contact solar cell module, the method comprising:
stitch-welding two back contact solar cells to form a back contact solar cell unit, and stitch-welding at least two strings of the back contact solar cell units to form a back contact solar cell string;
welding a positive electrode lead-out welding strip at the head part of the back contact solar cell string, and welding a negative electrode lead-out welding strip at the tail part of the back contact solar cell string;
providing an insulating paste area on the back surface of the back contact solar cell string, and printing an insulating material in the insulating paste area to form an insulating layer;
the method comprises the steps of stitch-welding at least two strings of back contact solar cell strings to form a back contact solar cell group, wherein during welding, the head part of one string of cell strings is stitch-welded with the tail part of the other string of cell strings, and the tail part of one string of cell strings is stitch-welded with the head part of the other string of cell strings;
when the busbar is welded, the welding strip is attached to the back contact solar cell, the welding strip is pulled up to a certain angle along the surface of the back contact solar cell in an inclined mode, and the busbar is placed between the insulating slurry area and the welding strip for welding.
Further, the method further comprises the following steps:
two strings of back contact solar cell strings are connected through a sectional black busbar;
and a black organic adhesive film is adhered to one side of the segmented black bus belt close to the back contact solar cell string or a black insulating material is printed on the segmented black bus belt.
Further, the method further comprises the following steps:
and welding the head part of the battery string with the tail part of another battery string in an infrared heating mode.
Further, when the bus belt is placed, the welding is obliquely pulled up by a certain angle, and the angle range is 45-60 degrees.
The full-black back contact solar cell module provided by the invention has the full-black appearance, high power and high density performance, reduces the white left in the cell module and improves the consistency of the appearance of the cell module; according to the efficiency formula: as can be seen from efficiency=power/total area, the technical scheme improves the power density of the battery assembly by shortening the long side size, and improves the conversion efficiency and reliability of the battery assembly.
The invention has the beneficial effects that the insulating paste is printed on the back junction area of the all-black back contact solar cell module, so that the short circuit between the junction strip and the back contact solar cell grid line is avoided, and the anode and the cathode of the back contact solar cell are effectively isolated. The ultrathin bus strip is used as a conducting band for connecting two back contact solar cells in series, the conducting band is arranged on the back surface of the back contact solar cell printed with the insulating slurry, and the appearance of the all-black assembly of the back contact solar cell assembly is realized by adopting an ultrathin sectional welding strip or a black organic adhesive film. The position of the ultra-thin busbar zone is accurately positioned in the accurate insulating slurry zone, and the welding zone in the busbar zone is pulled up by 45-60 degrees in the oblique angle direction during welding, so that the ohmic contact between the ultra-thin busbar zone and the welding zone is realized, the infrared low-temperature welding is realized, and the insulating slurry layer is prevented from being damaged so as to reduce the packaging fragment rate.
Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. The objectives and other advantages of the invention may be realized and attained by the structure particularly pointed out in the written description and claims hereof as well as the appended drawings.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the following description will briefly explain the drawings used in the embodiments or the description of the prior art, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic diagram of an all-black back contact solar cell module in an embodiment of the invention;
FIG. 2 shows a schematic diagram of a back contact solar cell string in an embodiment of the invention;
FIG. 3 shows a schematic diagram of back contact solar cell stitch bonding in an embodiment of the invention;
FIG. 4 shows a schematic diagram of a back contact solar cell insulating paste printing area in an embodiment of the invention;
FIG. 5 shows a schematic diagram of a back contact solar cell string ribbon connection in an embodiment of the invention;
FIG. 6 shows an enlarged view of a back contact solar cell string ribbon connection in an embodiment of the invention;
FIG. 7 is a schematic diagram of a string of 12 adjacent back contact solar cells in an embodiment of the invention;
FIG. 8 shows an enlarged view of a string of 12 adjacent back contact solar cells in an embodiment of the invention;
FIG. 9 illustrates a segmented bus strip schematic diagram in accordance with an embodiment of the present invention;
fig. 10 is a schematic cross-sectional view of a single-piece back contact solar cell string provided with a bus bar in an embodiment of the present invention.
In the figure, the 1-insulating paste region, the 2-first ultrathin segmented bus bar, the 3-B string head-end solder bar, the 4-a string tail-end solder bar, the 5-second ultrathin segmented bus bar, the 6-third ultrathin segmented bus bar, the 7-diode location, the 8-insulating layer, the 9-solar cell string, the 10-bus bar, the 11-back contact solar cell a, the 12-back contact solar cell B.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the construction process of the distributed photovoltaic power station, because the usable area of a factory roof or a roof is limited, a user mostly selects a photovoltaic cell assembly product with high power and high conversion efficiency when the cell assembly is selected. At present, a series-parallel battery assembly formed by packaging PERC, TOPCON, IBC batteries is used in the market, but the battery assembly has the problems of white reserved in the middle of the appearance of the battery, low power density and low conversion efficiency.
The invention provides a full black back contact solar cell module and a preparation method thereof, which can solve the technical problems,
an all-black back contact solar cell module comprising:
a plurality of strings of back contact solar cell strings spliced together;
the back contact solar cell string comprises a plurality of back contact solar cell units spliced together;
the back contact solar cell unit comprises at least two back contact solar cells spliced together; wherein,,
and a bus belt with the thickness of 0.12-0.20 mm is welded between two adjacent strings of back contact solar battery strings, and the bus belt is used for connecting and outputting electric energy generated by the two adjacent strings of back contact solar battery strings.
Specifically, as shown in fig. 1, a schematic diagram of an all-black back contact solar cell module in an embodiment of the invention is shown. In the figure, a back contact solar battery pack formed by splicing 12 back contact solar battery strings is formed by welding a bus bar 10 between two back contact solar battery packs, and two back contact solar battery packs are spliced by combining an A string tail end welding band and a B string tail end welding band where the bus bar 10 is positioned with a second ultrathin sectional bus bar 5. The end part of one back contact solar battery pack is provided with a first ultrathin sectional bus-bar 2, and the end part of the other back contact solar battery pack is provided with a third ultrathin sectional bus-bar 6.
As shown in fig. 2, the length of the back contact solar cell string is generally defined as L2, and the number of L2 is the number of cell string units constituting the back contact solar cell string. The head and tail parts of each string of back contact solar cell strings are provided with an anode grid line and a cathode grid line; the back of the head and tail of each string of back contact solar cell strings is provided with an insulating paste area 1, and the head and tail of each string of back contact solar cell strings are respectively adjacent to the head and tail of the adjacent back contact solar cell strings and are connected through a bus bar 10 at the back. A bypass diode is arranged in parallel at the diode position 7 between two adjacent back contact solar cell strings. A bus bar 10 having a thickness of 0.12 to 0.20 mm is provided between two adjacent strings of back contact solar cell strings to output the current of the back contact solar cell strings to a circuit where the back contact solar cell strings are located.
The back of the back contact solar cell string is provided with an insulating layer 8, and the bus bar 10 is arranged on the insulating layer and isolated from the positive electrode grid line and the negative electrode grid line so as to avoid short circuit. The width of the insulating layer 8 is 1.2 to 1.5 times the width of the bus bar 10.
The preparation method of the all-black back contact solar cell module comprises the following steps:
step 1, stitch-welding two strings of back contact solar cells to form back contact solar cells, stitch-welding at least two back contact solar cells to form a back contact solar cell string, wherein the stitch-welding is performed after overlapping a back contact solar cell A11 and a back contact solar cell B12 for L2 length, as shown in a stitch-welding schematic diagram in FIG. 3;
step 2, welding a positive electrode lead-out welding strip at the head part of the back contact solar cell string, and welding a negative electrode lead-out welding strip at the tail part of the back contact solar cell string;
step 3, an insulating paste area 1 is arranged on the back surface of the back contact solar cell string, an insulating material is printed in the insulating paste area 1 to form an insulating layer 8, and the printed area is specifically shown in fig. 4;
step 4, stitch-welding at least two strings of back contact solar battery strings to form a back contact solar battery pack, wherein the head part of one string of battery strings is stitch-welded with the tail part of the other string of battery strings, and the tail part of one string of battery strings is stitch-welded with the head part of the other string of battery strings;
and 5, when the bus bar 10 is welded, the welding bar is attached to the back contact solar cell string, the welding bar is pulled up to a certain angle along the surface of the back contact solar cell string, the angle range is 45-60 degrees, and the bus bar 10 is placed between the insulating paste area 1 and the welding bar for welding.
As shown in fig. 5, a schematic diagram of 6 adjacent back contact solar cell strings is shown, the 6 adjacent back contact solar cell strings form a back contact solar cell group, the head of each back contact solar cell group is provided with an insulating paste region 1, and a shaded portion is an insulating layer 8 printed with an insulating material. A bus bar 10 is disposed between adjacent back contact solar cell strings, a first bus bar, a second bus bar, and a third bus bar, respectively. Fig. 6 is a partial enlarged view of the three bus bars.
As shown in fig. 10, a schematic cross-sectional structure of a single-string back-contact solar cell string is shown, an insulating layer 8 is disposed above the single-string back-contact solar cell string, a bus bar 10 is disposed above the insulating layer 8, and the bus bar 10 is fixed above the insulating layer 8 of the single-string back-contact solar cell string 9 by welding.
Specifically, as shown in fig. 7, the schematic diagram of 12 adjacent back contact solar cell strings is divided into a first back contact solar cell group and a second back contact solar cell group, wherein the first back contact solar cell group has 6 back contact solar cell strings, the head end is a head part of the B string, the head part is divided into a head part, a tail part, a head part and a tail part, and the corresponding electrodes are positive electrode, negative electrode, positive electrode and negative electrode 6 back contact solar cell strings. The second back contact solar battery pack is provided with 6 back contact solar battery strings, the head end is the head part of the A string, the head part is the head part, the tail part is the tail part, the head part, the tail part is the head part and the tail part, and the corresponding electrodes are the positive electrode, the negative electrode, the positive electrode, the negative electrode and the positive electrode and the negative electrode 6 back contact solar battery strings. The ends of the first back contact solar cell set and the second back contact solar cell set are welded in the welding mode of the converging strip, and the back contact solar cell module of fig. 1 can be obtained. And the head part of the battery string and the tail part of the other battery string are welded with the confluence belt at low temperature in an infrared heating mode.
The back contact solar cell module is of a full black appearance, and the preparation method further comprises the steps of preparing of the full black appearance: the two strings of back contact solar cell strings are connected through the sectional black bus bar, and the bus bar 10 arranged in the middle is the sectional black bus bar, and is a partial enlarged view of the sectional black bus bar between the two back contact solar cell groups as shown in fig. 8; and a black organic adhesive film is adhered to one side of the bus bar 10 close to the back contact solar cell string or a black insulating material is printed on the bus bar.
Fig. 9 is a schematic view of a sectional bus bar of the present invention, wherein the two ends of the sectional bus bar are the bus bar ends of the non-black section, the length is b, and the middle is the sectional black bus bar width is a. The sectional type black busbar is used for achieving the full black effect of the appearance of the back contact solar cell module.
According to the full-black back contact solar cell module and the preparation method thereof, the insulating slurry is printed on the back surface of the back contact solar cell module, an ultrathin converging belt is not known on the insulating slurry area 1, electric energy converging of a back contact cell string is achieved, meanwhile, the power density of the cell module is improved by reducing the white left inside the cell module and shortening the long side size, the conversion efficiency of the cell module is improved, the consistency of the appearance of the cell module is improved by adopting the ultrathin sectional converging belt, and the full-black appearance effect is achieved. The dimension of the shortened long side improves the conversion efficiency of the battery assembly, the appearance of the fully black battery assembly is realized by adopting an ultrathin bus-bar or a black organic adhesive film pasting mode, the appearance consistency of the back contact battery assembly is improved, the use of the isolating strips is reduced, and the reliability of the battery assembly is improved.
Although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. An all black back contact solar cell module, comprising:
a plurality of strings of back contact solar cell strings spliced together;
the back contact solar cell string comprises a plurality of back contact solar cell units spliced together;
the back contact solar cell unit comprises at least two back contact solar cells spliced together; wherein,,
and a bus belt with the thickness of 0.12-0.20 mm is welded between two adjacent strings of back contact solar battery strings, and the bus belt is used for connecting and outputting electric energy generated by the two adjacent strings of back contact solar battery strings.
2. The back contact solar cell assembly of claim 1, wherein the front and rear portions of the back contact solar cell string are provided with positive and negative grid lines, the front and rear cell back surfaces of the back contact solar cell string are provided with an insulating layer, and the bus bar is arranged on the insulating layer and isolated from the positive and negative grid lines to avoid short circuit.
3. The back contact solar cell assembly of claim 2, wherein the back contact solar cell string is end-to-end when adjacent to the back contact solar cell string.
4. The back contact solar cell module of claim 2, wherein the insulating layer has a width of 1.2 to 1.5 times the width of the bus bar.
5. The back contact solar cell assembly of claim 1, wherein the back contact solar cell assembly is a full black appearance.
6. The back contact solar cell module of claim 1, wherein bypass diodes are arranged in parallel between two adjacent back contact solar cell strings.
7. A method for preparing an all-black back contact solar cell module, the method comprising:
stitch-welding two back contact solar cells to form a back contact solar cell unit, and stitch-welding at least two strings of the back contact solar cell units to form a back contact solar cell string;
welding a positive electrode lead-out welding strip at the head part of the back contact solar cell string, and welding a negative electrode lead-out welding strip at the tail part of the back contact solar cell string;
providing an insulating paste area on the back surface of the back contact solar cell string, and printing an insulating material in the insulating paste area to form an insulating layer;
the method comprises the steps of stitch-welding at least two strings of back contact solar cell strings to form a back contact solar cell group, wherein during welding, the head part of one string of cell strings is stitch-welded with the tail part of the other string of cell strings, and the tail part of one string of cell strings is stitch-welded with the head part of the other string of cell strings;
when the busbar is welded, the welding strip is attached to the back contact solar cell, the welding strip is pulled up to a certain angle along the surface of the back contact solar cell in an inclined mode, and the busbar is placed between the insulating slurry area and the welding strip for welding.
8. The method of manufacturing a back contact solar cell module of claim 7, further comprising:
two strings of back contact solar cell strings are connected through a sectional black busbar;
and a black organic adhesive film is adhered to one side of the segmented black bus belt close to the back contact solar cell string or a black insulating material is printed on the segmented black bus belt.
9. The method of manufacturing a back contact solar cell module of claim 7, further comprising:
and welding the head part of the battery string with the tail part of another battery string in an infrared heating mode.
10. The method of claim 7, wherein the ribbon is placed with the solder being pulled up obliquely at an angle in the range of 45 degrees to 60 degrees.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202310771276.9A CN116504863A (en) | 2023-06-28 | 2023-06-28 | Full-black back contact solar cell module and preparation method thereof |
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| CN202310771276.9A CN116504863A (en) | 2023-06-28 | 2023-06-28 | Full-black back contact solar cell module and preparation method thereof |
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| CN217468456U (en) * | 2022-05-11 | 2022-09-20 | 通威太阳能（合肥）有限公司 | Photovoltaic module and photovoltaic power plant |
| CN115425104A (en) * | 2022-09-08 | 2022-12-02 | 青海黄河上游水电开发有限责任公司西宁太阳能电力分公司 | Solar energy IBC battery pack with hidden bus bar |
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Application publication date: 20230728 |