CN108987533B - Preparation method of solar cell module and solar cell module - Google Patents
Preparation method of solar cell module and solar cell module Download PDFInfo
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- CN108987533B CN108987533B CN201810814522.3A CN201810814522A CN108987533B CN 108987533 B CN108987533 B CN 108987533B CN 201810814522 A CN201810814522 A CN 201810814522A CN 108987533 B CN108987533 B CN 108987533B
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- 238000002360 preparation method Methods 0.000 title abstract description 5
- 238000003466 welding Methods 0.000 claims abstract description 50
- 229910000679 solder Inorganic materials 0.000 claims abstract description 41
- 238000000034 method Methods 0.000 claims abstract description 25
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 238000004806 packaging method and process Methods 0.000 claims description 5
- 238000006243 chemical reaction Methods 0.000 claims description 3
- 238000012216 screening Methods 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 5
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012858 packaging process Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- 239000002313 adhesive film Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 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
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
- H01L31/1876—Particular processes or apparatus for batch treatment of the devices
- H01L31/188—Apparatus specially adapted for automatic interconnection of solar cells in a module
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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
-
- 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
-
- 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 invention is suitable for the technical field of photovoltaic power generation, and provides a preparation method of a solar cell module and the solar cell module, wherein the method comprises the following steps: scribing the solar cell, and dividing the solar cell into n regions, wherein the scribing lines are arranged between two adjacent main grid lines in the solar cell, and n is greater than 1 and less than or equal to the number of the main grid lines in the solar cell; connecting a plurality of scribed solar cells in series into a cell string through a solder strip; the battery strings are connected side by side through the bus bars, wherein one bus bar is connected with the welding strips led out from the upper ends of two adjacent battery strings, m bus bars are connected with the welding strips led out from the lower ends of two adjacent battery strings, and m is smaller than or equal to n. The invention can reduce the loss of the solder strip and improve the output power of the solar cell module.
Description
Technical Field
The invention belongs to the technical field of photovoltaic power generation, and particularly relates to a preparation method of a solar cell module and the solar cell module.
Background
Solar cells are devices that convert solar energy into electrical energy, and are an ideal clean energy source. When solar cells are used, the solar cells need to be packaged into solar cell modules. As shown in fig. 1, in a conventional solar cell module, a plurality of solar cells 100 are connected in series by solder ribbons 101 to form a cell string, and the cell string is connected in parallel by bus bars 102. However, a part of the electrical loss is caused by the solder ribbon, resulting in a decrease in the output power of the solar cell module.
Disclosure of Invention
In view of this, embodiments of the present invention provide a method for manufacturing a solar cell module and a solar cell module, so as to solve the problem of low output power of the solar cell module in the prior art.
A first aspect of an embodiment of the present invention provides a method for manufacturing a solar cell module, including:
scribing the solar cell, and dividing the solar cell into n regions, wherein the scribing lines are arranged between two adjacent main grid lines in the solar cell, and n is greater than 1 and less than or equal to the number of the main grid lines in the solar cell;
connecting a plurality of scribed solar cells in series into a cell string through a solder strip;
the battery strings are connected side by side through the bus bars, wherein one bus bar is connected with the welding strips led out from the upper ends of two adjacent battery strings, m bus bars are connected with the welding strips led out from the lower ends of two adjacent battery strings, and m is smaller than or equal to n.
Optionally, the welding strip that draws forth with the upper end of two adjacent battery clusters respectively through a strip of converging is connected, the welding strip that draws forth with the lower extreme of two adjacent battery clusters respectively through m strips of converging is connected, include:
the m bus bars are respectively connected with a welding strip led out from the lower end of the first battery string and a welding strip led out from the lower end of the second battery string; the welding strip led out from the upper end of the second battery string and the welding strip led out from the upper end of the third battery string are respectively connected through a bus bar; the m bus bars are respectively connected with a welding strip led out from the lower end of the third battery string and a welding strip led out from the lower end of the fourth battery string, and so on; and bus bars at the upper ends of the two outermost battery strings are led out of the lead wires.
Optionally, when the number of the solder strips in the solar cell is less than or equal to a preset threshold, the number m of the bus bars is the same as the number of the solder strips in the solar cell, and each bus bar is connected to one solder strip led out from the lower end of each of the two adjacent cell strings.
Optionally, when the number of the solder strips in the solar cell is greater than the preset threshold, the number m of the bus bars is greater than the preset threshold and less than the number of the solder strips in the solar cell, and at least one bus bar is connected to the solder strips led out from the lower ends of two adjacent cell strings.
Optionally, the width of the scribe line is less than or equal to 50 microns; the depth of the scribing line is greater than or equal to 15 microns and less than or equal to 1/5 the thickness of the solar cell sheet.
Optionally, n is equal to the number of the main grid lines in the solar cell, and the distance between the scribing line and two adjacent main grid lines is equal.
Optionally, before the scribing process is performed on the solar cell, the method further includes:
and carrying out efficiency screening on the solar cells to ensure that the difference of the photoelectric conversion efficiency of the solar cells which are connected in series into the cell string is less than 0.1 percent.
Optionally, the method further includes: and packaging the battery strings connected in parallel.
Optionally, the led-out welding strip is vertically connected with the bus bar, the welding strip led out from the front of the battery string is connected with the front of the bus bar, and the welding strip led out from the back of the battery string is connected with the back of the bus bar.
A second aspect of the embodiments of the present invention provides a solar cell module, which is prepared by the method for preparing a solar cell module according to the first aspect of the embodiments of the present invention.
Compared with the prior art, the embodiment of the invention has the following beneficial effects: according to the embodiment of the invention, the solar battery pieces are divided into a plurality of regions and then are connected in series to form the battery strings, the battery strings are connected in parallel through the bus bars, the bus bars are respectively connected with the welding strips led out from the upper ends of two adjacent battery strings through one bus bar, and the m bus bars are respectively connected with the welding strips led out from the lower ends of two adjacent battery strings, so that the solar battery pieces in the battery strings are connected in series, and the regions of each solar battery piece are connected in parallel, so that the current of a solar battery assembly can be reduced, the loss of the welding strips is reduced, and the output power of the solar battery assembly is improved. And moreover, the method can be realized by using the traditional welding equipment, and the novel welding equipment does not need to be additionally purchased, so that the cost is reduced.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments or the prior art descriptions will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive exercise.
Fig. 1 is a schematic structural diagram of a solar cell module in the prior art according to an embodiment of the present invention;
fig. 2 is a schematic flow chart illustrating an implementation of a method for manufacturing a solar cell module according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a solar cell provided in accordance with another embodiment of the present invention;
fig. 4 is a schematic structural diagram of a solar cell provided in another embodiment of the present invention;
FIG. 5 is a schematic view of a portion of a solar cell module according to another embodiment of the invention;
fig. 6 is a schematic structural diagram of a solar cell module according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a solar cell module according to another embodiment of the present invention.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth, such as particular system structures, techniques, etc. in order to provide a thorough understanding of the embodiments of the invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present invention with unnecessary detail.
In order to explain the technical means of the present invention, the following description will be given by way of specific examples.
Example one
As shown in fig. 2, a method for manufacturing a solar cell module includes the following steps:
step S101, scribing the solar cell, and dividing the solar cell into n regions, wherein the scribing lines are arranged between two adjacent main grid lines in the solar cell, and n is greater than 1 and less than or equal to the number of the main grid lines in the solar cell.
In the embodiment of the invention, as shown in fig. 3 and 4, a solar cell 300 is provided with main grid lines 301 and thin grid lines (not shown in the drawings), and the main grid lines 301 are perpendicular to the thin grid lines. N-1 scribing lines 302 are scribed in the solar cell piece 300 through a laser scribing process, the direction of the scribing lines 302 is the same as that of the main grid lines 301, the length of the scribing lines 302 is the same as that of the solar cell piece 300, the solar cell is divided into n regions through the scribing lines 302, wherein n is larger than 1 and smaller than or equal to the number of the main grid lines in the solar cell piece. For example, as shown in fig. 3, the number of the main gate lines 301 in the solar cell 300 is 4, the number of the scribe lines 302 is 3, the solar cell is divided into 4 regions, and each scribe line 302 is disposed between two main gate lines 301. For another example, as shown in fig. 4, in the solar cell 300, the number of the main gate lines 301 is 4, the number of the scribe lines 302 is 2, the solar cell is divided into 3 regions, and each scribe line 302 is disposed between two main gate lines 301.
Preferably, the width of the scribe line 302 is less than or equal to 50 microns. The depth of the scribe line 302 is greater than or equal to 15 microns and less than or equal to 1/5 of the thickness of the solar cell sheet 300.
In the embodiment of the invention, when the width of the scribing line 302 is greater than 50 μm, the solar cell 300 is wasted. When the depth of the scribe line 302 is less than 15 μm, the adjacent two regions cannot be insulated, and when the depth of the scribe line is greater than 1/5 of the thickness of the solar cell sheet 300, the solar cell sheet 300 is easily chipped.
Optionally, n is equal to the number of the main grid lines 301 in the solar cell 300, and the distance between the scribing line 302 and two adjacent main grid lines 301 is equal.
In the embodiment of the invention, the solar cell piece 300 is equally divided into n regions, so that the current of each region is 1/n before being equally divided, and the transmission loss of the current is reduced.
And step S102, connecting a plurality of scribed solar cells in series into a cell string through a solder strip.
In the embodiment of the invention, the welding strips are arranged on the main grid lines of the solar cell, and the welding strips are led out from the upper end and the lower end of the cell string. The length of the welding strip led out from the upper end of the battery string is the same as that of the welding strip led out from the upper end of the traditional battery string, and the length of the welding strip led out from the lower end of the battery string needs to be determined according to the distance between the confluence strips connected with the battery string. For example, as shown in fig. 5, the outermost solder ribbon 401 of the solar cell sheet 400 has the longest lead length, and when the bus bars 402 connected to the solder ribbon 401 led out from the lower end of the cell string have the same width and the distance between two adjacent bus bars 402 is the same, the length L of the outermost solder ribbon 401 is L ═ md1+(m-1)d2+d3Wherein m is the number of bus bars connected to the lower end of the battery string, d1To the width of the bus bar, d2Is the distance between two adjacent bus strips, d3The distance between the bus bar closest to the solar cell and the edge of the solar cell.
And S103, connecting the plurality of battery strings side by side through bus bars, wherein one bus bar is respectively connected with the welding strips led out from the upper ends of two adjacent battery strings, m bus bars are respectively connected with the welding strips led out from the lower ends of two adjacent battery strings, and m is less than or equal to n.
In the embodiment of the invention, as shown in fig. 6 and 7, a plurality of bus bars 402 are used to connect with the solder strips led out from the lower ends of two adjacent battery strings, one bus bar 402 is used to connect with the solder strips led out from the upper ends of two adjacent battery strings, and the upper ends of the battery strings are provided with bus bar leads which are connected with the single junction box of the bypass diode through the bus bar leads. Through the connection mode, the solar battery pieces in the battery string can be connected in series, and all areas of each solar battery piece are connected in parallel, so that the current of the solar battery assembly is reduced, and the loss of the welding strip is reduced.
Optionally, when the number of the solder strips in the solar cell is less than or equal to a preset threshold, the number m of the bus bars is the same as the number of the solder strips in the solar cell, and each bus bar is connected to one solder strip led out from the lower end of each of the two adjacent cell strings.
Optionally, when the number of the solder strips of the solar cell is greater than the preset threshold, the number m of the bus bars is greater than the preset threshold and less than the number of the solder strips in the solar cell, wherein at least one bus bar is connected with a plurality of solder strips led out from the lower ends of two adjacent cell strings.
In the embodiment of the invention, when the number of the solder strips 401 in the solar cell 400 is less than or equal to the preset value, the number of the bus bars 402 is the same as the number of the solder strips 401 in the solar cell. For example, the number of the solder strips 401 in the solar cell is less than or equal to 6, and as shown in fig. 6, the number of the solder strips 401 in the solar cell is 4, then 4 bus bars 402 are used to connect with the solder strips 401 led out from the lower ends of two adjacent cell strings, and each bus bar 402 is connected with one solder strip 401 on the left side and one solder strip 401 on the right side. When the number of the solder strips 401 of the solar cell 400 is greater than a preset threshold, the number of the bus bars 402 is greater than the preset threshold and less than the number of the solder strips 401 in the solar cell 400. For example, the number of the solder strips 401 in the solar cell 400 is greater than 6, and as shown in fig. 7, the number of the solder strips 401 in the solar cell 400 is 12, then 7 bus bars 402 are used to be respectively connected with the solder strips 401 led out from the lower ends of two adjacent cell strings, wherein 3 bus bars 402 nearest to the solar cell 400 are respectively connected with a plurality of solder strips 401 led out from the lower ends of two adjacent cell strings, wherein the number of the solder strips in two adjacent cell strings connected by the same bus bar 402 is the same, and thus current mismatch is prevented. According to the embodiment of the invention, the number of the bus bars m is determined according to the number of the welding strips in the battery string, so that when the number of the welding strips is large, the use number of the bus bars is reduced, the process difficulty can be reduced, and the efficiency of batch production is improved.
Optionally, the method further includes: and carrying out efficiency screening on the solar cells to ensure that the difference of the photoelectric conversion efficiency of the solar cells which are connected in series into the cell string is less than 0.1 percent. The embodiment of the invention can reduce the electrical loss caused by the efficiency mismatch of the solar cell.
Optionally, the method further includes: and packaging the battery strings connected in parallel.
In the embodiment of the invention, the solar cell module is formed by packaging the cell strings connected in parallel through materials such as glass, packaging adhesive films, a back plate, an aluminum alloy frame and the like. The specific packaging process is a packaging process commonly used in the art, and is not an improvement of the embodiment of the present invention, and is not described herein again.
Optionally, the led-out welding strip is vertically connected with the bus bar strip, the welding strip led out from the front of the battery string is connected with the front of the bus bar strip, and the welding strip led out from the back of the battery string is connected with the back of the bus bar strip, so that the welding strip can be prevented from warping.
According to the embodiment of the invention, the solar battery pieces are divided into a plurality of regions and then are connected in series to form the battery strings, the battery strings are connected in parallel through the bus bars, the bus bars are respectively connected with the welding strips led out from the upper ends of two adjacent battery strings through one bus bar, and the m bus bars are respectively connected with the welding strips led out from the lower ends of two adjacent battery strings, so that the solar battery pieces in the battery strings are connected in series, and the regions of each solar battery piece are connected in parallel, so that the current of a solar battery assembly can be reduced, the loss of the welding strips is reduced, and the output power of the solar battery assembly is improved. And moreover, the method can be realized by using the traditional welding equipment, and the novel welding equipment does not need to be additionally purchased, so that the cost is reduced.
It should be understood that, the sequence numbers of the steps in the foregoing embodiments do not imply an execution sequence, and the execution sequence of each process should be determined by its function and inherent logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.
Example two
The solar cell module is prepared by the preparation method of the solar cell module according to the first embodiment of the invention, and has the beneficial effects of the first embodiment of the invention.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present 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 solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; such modifications and substitutions do not substantially depart from the spirit and scope of the embodiments of the present invention, and are intended to be included within the scope of the present invention.
Claims (7)
1. A method for manufacturing a solar cell module, comprising:
the method comprises the following steps of carrying out scribing treatment on a solar cell piece, dividing the solar cell piece into n regions, wherein scribing lines are arranged between two adjacent main grid lines in the solar cell piece, n is larger than 1 and smaller than or equal to the number of the main grid lines in the solar cell piece, the depth of each scribing line is larger than or equal to 15 micrometers, and the length of each scribing line is the same as that of the solar cell piece;
connecting a plurality of scribed solar cells in series into a cell string through a solder strip;
the battery strings are connected side by side through the bus bars, wherein one bus bar is respectively connected with the welding strips led out from the upper ends of two adjacent battery strings, m bus bars are respectively connected with the welding strips led out from the lower ends of two adjacent battery strings, m is more than or equal to 2, and m is equal to n; the welding strip led out from the lower end of the first battery string and the welding strip led out from the lower end of the second battery string are respectively connected through m bus bars; the welding strip led out from the upper end of the second battery string and the welding strip led out from the upper end of the third battery string are respectively connected through a bus bar; the m bus bars are respectively connected with a welding strip led out from the lower end of the third battery string and a welding strip led out from the lower end of the fourth battery string, and so on; moreover, bus bars at the upper ends of the two battery strings at the outermost side are led out of leads;
the number of the welding strips in the solar cell is smaller than or equal to a preset threshold value, the number m of the bus strips is the same as the number of the welding strips in the solar cell, and each bus strip is connected with one welding strip led out from the lower end of each two adjacent cell strings.
2. The method of claim 1, wherein the scribe line has a width of less than or equal to 50 microns; and the depth of the scribing line is less than or equal to 1/5 of the thickness of the solar cell piece.
3. The method of claim 1, wherein n is equal to the number of the main grid lines in the solar cell piece, and the distance between the scribing line and two adjacent main grid lines is equal.
4. The method of claim 1, wherein the step of scribing the solar cell piece further comprises:
and carrying out efficiency screening on the solar cells to ensure that the difference of the photoelectric conversion efficiency of the solar cells which are connected in series into the cell string is less than 0.1 percent.
5. The method of manufacturing a solar cell module according to claim 1, further comprising: and packaging the battery strings connected in parallel.
6. The method of claim 1, wherein the extracted solder ribbon is connected perpendicularly to the bus bar, and the solder ribbon extracted from the front surface of the cell string is connected to the front surface of the bus bar, and the solder ribbon extracted from the back surface of the cell string is connected to the back surface of the bus bar.
7. A solar cell module produced by the method for producing a solar cell module according to any one of claims 1 to 6.
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| CN201810814522.3A CN108987533B (en) | 2018-07-23 | 2018-07-23 | Preparation method of solar cell module and solar cell module |
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| CN201810814522.3A CN108987533B (en) | 2018-07-23 | 2018-07-23 | Preparation method of solar cell module and solar cell module |
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| CN110649112A (en) * | 2019-09-26 | 2020-01-03 | 苏州腾晖光伏技术有限公司 | Optimized crystalline silicon battery assembly and solar cell panel |
| CN110931589A (en) * | 2019-12-10 | 2020-03-27 | 英利能源（中国）有限公司 | Solar cell, cell string and solar cell module |
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| CN101390220A (en) * | 2006-02-24 | 2009-03-18 | 达伊4能量有限公司 | High voltage solar cell and solar cell module |
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