CN111029432B - Solar cell string, solar cell assembly and manufacturing method of solar cell string - Google Patents
Solar cell string, solar cell assembly and manufacturing method of solar cell string Download PDFInfo
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- CN111029432B CN111029432B CN201911418105.8A CN201911418105A CN111029432B CN 111029432 B CN111029432 B CN 111029432B CN 201911418105 A CN201911418105 A CN 201911418105A CN 111029432 B CN111029432 B CN 111029432B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 26
- 238000003698 laser cutting Methods 0.000 claims abstract description 35
- 230000007547 defect Effects 0.000 claims abstract description 31
- 238000000034 method Methods 0.000 claims abstract description 23
- 238000003466 welding Methods 0.000 claims abstract description 20
- 238000005520 cutting process Methods 0.000 claims description 37
- 229910000679 solder Inorganic materials 0.000 claims description 21
- 238000003475 lamination Methods 0.000 claims description 13
- 206010041662 Splinter Diseases 0.000 abstract description 12
- 230000008569 process Effects 0.000 abstract description 10
- 238000010030 laminating Methods 0.000 abstract description 4
- 238000005336 cracking Methods 0.000 abstract description 3
- 238000012797 qualification Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 239000005038 ethylene vinyl acetate Substances 0.000 description 6
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 6
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 5
- 239000011521 glass Substances 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 230000002950 deficient Effects 0.000 description 4
- 230000007246 mechanism Effects 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 235000012431 wafers Nutrition 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 2
- 239000002390 adhesive tape Substances 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 230000008719 thickening Effects 0.000 description 1
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/38—Removing material by boring or cutting
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/70—Auxiliary operations or equipment
- B23K26/702—Auxiliary equipment
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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
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- 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
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Abstract
The invention provides a solar cell string, a solar cell module and a manufacturing method of the solar cell string, wherein the solar cell string comprises: the solar cell comprises a plurality of solar cell units which are connected in series, wherein a plurality of notches are formed in the edge of one side of each solar cell unit, each solar cell unit is provided with a first surface and a second surface opposite to the first surface, the solar cell units are arranged in a row in a mode that the notch directions are consistent, two adjacent solar cell units are connected through a welding strip, the welding strip is connected with the first surface of one solar cell unit and penetrates through the notch of the first surface to be connected with the second surface of the other solar cell unit, the position of the notch corresponding to the first surface is a laser cutting defect layer, and the position of the notch corresponding to the second surface is a splinter defect layer. According to the solar cell string, the probability of hidden cracking of the solar cell with the notch in the laminating process can be reduced during assembly, and the qualification rate of products is improved.
Description
Technical Field
The invention relates to the field of solar cell string and solar cell module manufacturing, in particular to a solar cell string, a solar cell module and a manufacturing method thereof.
Background
The technology of the photovoltaic module is mature, and a typical single-glass photovoltaic module structure is mainly formed by packaging glass, EVA (ethylene vinyl acetate), a battery string group, EVA and a back plate; the typical dual-glass assembly is formed by packaging glass, EVA (ethylene vinyl acetate copolymer), a battery string set and EVA glass.
In recent years, various high-efficiency photovoltaic technologies have been developed, and typically, there are a multi-master cell assembly, a half-cell assembly of a cell slice, a stack assembly of a cell slice cut into several small pieces, a technical assembly of a cell slice connected by a solder ribbon, which is called parallel welding, and the like, wherein the typical stack assembly is electrically connected between the cell slices by a conductive adhesive tape or a conductive paste.
The solar cell module comprises a cell string formed by connecting a plurality of solar cells through solder strips. One end of the welding strip is connected with one surface electrode of one cell and penetrates through the notch of the welding strip to be connected with the other surface electrode of the adjacent cell, the notch of the solar cell is usually cut by laser, and then the solar cell is split manually or mechanically, so that the notch is easy to crack in the laminating process of manufacturing the solar module, once the control is not good, a large number of hidden cracks can occur, and a large number of scrappings are caused.
Disclosure of Invention
In view of the above, the present invention provides a solar cell string, a solar cell module and a method for manufacturing the solar cell string and the solar cell module, so as to solve the problem caused by the increased notch stress during the assembly process of the solar cell module.
To solve the above technical problem, according to an aspect of the present invention, there is provided a solar cell string including: the solar cell comprises a plurality of solar cell units which are connected in series, wherein a plurality of notches are formed in the edge of one side of each solar cell unit, each solar cell unit is provided with a first surface and a second surface opposite to the first surface, the solar cell units are arranged in a row in a mode that the notch directions are consistent, two adjacent solar cell units are connected through a welding strip, the welding strip is connected with the first surface of one solar cell unit and penetrates through the notch of the first surface to be connected with the second surface of the other solar cell unit, the position of the notch corresponding to the first surface is a laser cutting defect layer, and the position of the notch corresponding to the second surface is a splinter defect layer.
Further, the solar cell unit is a sliced solar cell.
Further, the solar cell unit is prepared by the following method: providing the solar cell; cutting lines with regular concave-convex shapes are arranged from one side edge of the first surface of the solar cell piece through laser cutting; and splitting the solar cell along the cutting line of the solar cell to obtain two sliced solar cells, wherein the notch is formed at one side edge of one sliced solar cell.
Further, the solar cell unit is prepared by the following method: preparing a solar cell piece with through holes, wherein a plurality of through holes are formed in the first surface of the solar cell piece through laser; setting a cutting line by laser cutting from the first surface of the solar cell piece, wherein the cutting line extends along a first direction and penetrates through the through holes; and splitting along the cutting lines of the solar cell sheet to obtain two solar cell units.
Further, the depth of the cutting line is 10% -90% of the thickness of the solar cell piece.
Further, the number of the notches is consistent with that of the main grids of the solar battery unit, and the notches are respectively arranged in the extending direction of the main grids of the solar battery unit in a one-to-one correspondence mode.
Further, the planar shape of the notch is formed in an arc shape, a rectangular shape, a trapezoidal shape, or a polygonal shape.
Furthermore, the distance between two adjacent solar cell units is-2.0 mm.
According to another aspect of the present invention, there is provided a method for manufacturing a solar cell string, including: providing a plurality of solar battery units, wherein a plurality of notches are formed on one side edge of each solar battery unit, and each solar battery unit is provided with a first surface and a second surface opposite to the first surface; arranging a plurality of solar battery units in a row according to a mode that the directions of the notches are consistent; and connecting two adjacent solar battery units in series by using a welding strip, wherein the welding strip is connected with the first surface of one solar battery unit and is connected with the second surface of the other solar battery unit through a notch of the welding strip, the position of the notch corresponding to the first surface is a laser cutting defect layer, and the position of the notch corresponding to the second surface is a splintering defect layer.
Further, the solar cell unit is a sliced solar cell.
Further, the solar cell unit is prepared by the following method: providing the solar cell; cutting lines with regular concave-convex shapes are arranged from one side edge of the first surface of the solar cell piece through laser cutting; and splitting the solar cell along the cutting line of the solar cell to obtain two sliced solar cells, wherein the notch is formed at one side edge of one sliced solar cell.
Further, the solar cell unit is prepared by the following method: preparing a solar cell piece with through holes, wherein a plurality of through holes are formed in the first surface of the solar cell piece through laser; setting a cutting line by laser cutting from the first surface of the solar cell piece, wherein the cutting line extends along a first direction and penetrates through the through holes; and splitting along the cutting lines of the solar cell sheet to obtain two solar cell units.
Further, the depth of the cutting line is 10% -90% of the thickness of the solar cell piece.
Further, the number of the notches is consistent with that of the main grids of the solar battery unit, and the notches are respectively arranged in the extending direction of the main grids of the solar battery unit in a one-to-one correspondence mode.
Further, the planar shape of the notch is formed in an arc shape, a rectangular shape, a trapezoidal shape, or a polygonal shape.
Furthermore, the distance between two adjacent solar cell units is-2.0 mm.
According to another aspect of the invention, a solar cell module is provided, which comprises the above solar cell string.
According to another aspect of the present invention, there is provided a method for manufacturing a solar cell module, including: providing the solar cell string manufactured by the manufacturing method of the solar cell string; and carrying out lamination laying and lamination on the solar cell string to obtain the solar cell module.
The technical scheme of the invention at least has one of the following beneficial effects:
according to the solar cell string provided by the embodiment of the invention, the notch part of the edge of the solar cell unit is adjacent to the edge without the notch of the adjacent solar cell unit, and the solder strip penetrates through the notch to connect the two-phase solar cell unit, so that the utilization rate of the light receiving area of the solar cell module can be improved;
furthermore, the notch of the solar cell unit in contact with the solder strip is a laser cutting defect layer, and the stress value of the laser cutting defect layer is smaller than that of the splinter defect layer, so that the probability of hidden cracking of the solar cell unit with the notch in the laminating process can be reduced, and the product yield is improved.
Drawings
Fig. 1 is a schematic structural diagram of a solar cell string according to an embodiment of the invention;
fig. 2 is a schematic structural diagram of a series connection of adjacent solar cells in the solar cell string of fig. 1;
FIG. 3 is a cross-sectional schematic illustration of a notch cut layer of a solar cell unit in the solar cell string of FIG. 1;
FIG. 4 is a schematic structural diagram of a solar module according to an embodiment of the invention;
FIG. 5a is an EL diagram of a solar module according to one example of the invention;
FIG. 5b is an enlarged view of part A of FIG. 5 a;
fig. 6 is a schematic structural diagram of a series connection of adjacent solar cells in a solar cell string according to another embodiment of the present invention;
FIG. 7 is a schematic cross-sectional view of the notch-cut layer of FIG. 6;
fig. 8a is an EL diagram of a solar cell module obtained from the solar cell string of fig. 6;
fig. 8B is a partially enlarged view of portion B in fig. 8 a.
Reference numerals:
100. a solar cell string; 110. a solar cell unit; 111. a first surface of a solar cell unit; 112. a second surface of the solar cell unit; 113. a recess; 114. laser cutting the layer; 115. splitting the sheet layer; 120. welding a strip;
200. provided is a solar cell module.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the drawings of the embodiments of the present invention. It is to be understood that the embodiments described are only a few embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the described embodiments of the invention, are within the scope of the invention.
Unless defined otherwise, technical or scientific terms used herein shall have the ordinary meaning as understood by one of ordinary skill in the art to which this invention belongs. The use of "first," "second," and similar terms in the present application do not denote any order, quantity, or importance, but rather the terms are used to distinguish one element from another. Also, the use of the terms "a" or "an" and the like do not denote a limitation of quantity, but rather denote the presence of at least one. The terms "connected" or "coupled" and the like are not restricted to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships are changed accordingly.
A solar cell string 100 according to an alternative embodiment of the present invention, as shown in fig. 1 and 2, includes: a plurality of solar cells 110 and solder ribbons 120.
As shown in fig. 2, a plurality of solar battery cells 110 are connected in series, a side edge of each solar battery cell 110 is formed with a plurality of recesses 113, and each solar battery cell 110 has a first surface 111 (shown as an upper surface in fig. 2) and a second surface 112 (shown as a lower surface in fig. 2) opposite to the first surface 111. The plurality of solar battery cells 110 are arranged in a row in such a manner that the directions of the recesses are uniform, and adjacent two solar battery cells 110 are connected by a solder ribbon 120.
It should be noted that the present invention is not limited to whether the surface of the solar cell unit passing through the recess thereof, which is specifically connected to the solder ribbon, is the front surface or the back surface, i.e., the first surface may be the front surface or the back surface, and correspondingly, the second surface may be the back surface or the front surface, which are all included in the scope of the present invention.
Specifically, as shown in fig. 2, the solder strip 120 is connected to the first surface 111 of one solar cell 110 '(the left one shown in fig. 2) and connected to the second surface 112 of the other solar cell 110 "(the right one shown in fig. 2) through the notch 113 thereof, wherein the first surface 111 of the solar cell 110' is a laser-cut defect layer corresponding to the notch 113, and the second surface 112 is a splinter defect layer corresponding to the notch 113.
The laser-cut defect layer is a defect layer resulting from laser cutting, and the split defect layer is a defect layer resulting from splitting along a cutting line of the solar cell sheet by using a human power or a mechanism. In other words, for example, in the present invention, a solar cell is manufactured by scribing a silicon wafer with a laser (also referred to as a scribe line) so that a part of the thickness of the silicon wafer is broken by the laser, and then breaking the silicon wafer along the scribe line (scribe line) by a human power or a mechanism into two or more silicon wafers for manufacturing the solar cell. The solar cell unit formed in this manner has a defective layer in the thickness direction caused by laser cutting and a defective layer caused by splitting along the cutting line of the solar cell sheet using a human power or a mechanism, that is, a laser-cut defective layer and a split defective layer.
The surface of the notch 113 of the solar cell unit 110' in contact with the solder strip 120 is a laser cutting defect layer, and the stress value of the laser cutting defect layer is smaller than the stress value of the surface of the notch 113 in contact with the solder strip 120 in contact with a splinter defect layer, so that the solar cell unit 110 does not crack or the probability of cracking during the lamination process of the solar cell string 100 is reduced.
The surface of the notch 113 of the solar cell 110' in the prior art, which is in contact with the solder strip 120, has a higher stress of a flaked defect layer, so that the solar cell 110 has a high probability of subfissure or subfissure in the lamination process of the solar cell string 100, which affects the yield of products and increases the rejection rate of components.
According to the solar cell string 100 of the embodiment of the invention, the notch 113 portion of the edge of the solar cell unit 110' is adjacent to the non-notched edge of the adjacent solar cell unit 110 ", and the solder ribbon 120 passes through the notch 113 to connect the two-phase solar cell units, so that the utilization rate of the light receiving area of the solar cell module can be improved.
Specifically, when the solar cell string 100 is connected in a shingled manner, the notch 113 is designed to avoid the stress generated in the lamination due to the local thickening of the solder ribbon 120, and even if the solar cell string 100 is in a non-shingled manner (i.e., there is a gap between two adjacent solar cells 110, which is called non-shingled style), the gap can be further reduced, thereby further improving the conversion efficiency of the solar cell string 100. Thus, the present invention is applicable to both laminated and non-laminated assemblies.
According to one embodiment of the present invention, the solar cell sheet unit 110 is a sliced solar cell sheet. That is, the solar cell sheet is cut to form the solar cell unit 110 so as to meet different requirements of customers. Of course, the present invention is not limited thereto, and the solar cell may be formed by directly laser cutting a notch cut line and splitting the notch to form the notch 113, thereby forming the solar cell 110.
Specifically, as an alternative example, the sliced solar cell sheet may be prepared by:
and S1, providing the solar cell slice which is not cut.
S2, a scribe line having a regular concave-convex shape is formed by laser dicing from one edge of the first surface of the solar cell sheet.
And S3, splitting the solar cell along the cutting line of the solar cell by using manpower or a mechanism to obtain two sliced solar cells, wherein one side edge of one sliced solar cell is provided with a notch 113.
That is, through this step, one solar cell 110 (with a notch 113 at the edge) used in the present invention is obtained, and accordingly, one solar cell (not shown) with a protrusion at the edge is also obtained, and the solar cell with the protrusion at the edge can also be suitably used for manufacturing a solar cell module of a shingle type to reduce a shielding distance between the solar cells.
Specifically, as shown in fig. 3, the fault formed by laser cutting is a laser-cut layer 114, and the fault formed by splitting is a split layer 115, so that the slicing and notching of the cell can be synchronously realized, and the efficiency is improved.
The laser cutting layer 114 forms a laser cutting defect layer with low stress, and the splinter layer 115 forms a splinter defect layer with high stress.
As another alternative example, the sliced solar cell may also be prepared by:
s1', preparing a solar cell sheet having a through hole, and laser-forming a plurality of the through holes on a first surface of the solar cell sheet.
S2', a cutting line is provided from the first surface of the solar cell sheet by laser cutting, the cutting line extending in the first direction and passing through the plurality of through holes.
S3', splitting along the cutting lines of the solar cell sheet to obtain two solar cells 110, wherein the fault formed by laser cutting is a laser-cut layer 114, and the fault formed by splitting is a split layer 115.
Thus, by forming the through-hole first and then cutting, two solar battery cells 110 having notches at their edges used in the present invention can be formed at one time, and the production efficiency can be improved.
The laser cutting layer 114 forms a laser cutting defect layer with low stress, and the splinter layer 115 forms a splinter defect layer with high stress.
Further, in the above embodiment, the laser cutting depth is 10% to 90% of the thickness of the solar cell. Thus, the solar cell splitting and the recess 113 can be conveniently realized.
According to an embodiment of the present invention, the number of the notches of the solar cell 110 is the same as the number of the main grids of the solar cell 110, and the plurality of notches 113 are respectively disposed in a one-to-one correspondence in the extending direction of the main grids of the solar cell 110.
Among them, the planar shape of the notch 113 (so-called planar shape, i.e., shape in the first surface/second surface of the solar cell unit) may be arc-shaped, rectangular, trapezoidal, or polygonal, and preferably, the planar shape of the notch is a semi-circular arc-shape, in order to facilitate the passing of the solder ribbon through the notch while simplifying the process.
According to an embodiment of the invention, the distance between two adjacent solar cells 110 in the solar cell string 100 is-2.0 mm to 2.0 mm. The 2.0mm is that two adjacent solar battery units 110 are connected in a shingled connection mode, and the width of the overlapped part is increased by 2mm, so that the design can realize smaller space of the solar battery units and improve the utilization of the light receiving area of the solar battery module.
As shown in fig. 4, according to the solar cell module 200 of the embodiment of the present invention, the cell string 100 of the present invention is prepared by stacking, laying, laminating, and the like.
The present invention is further illustrated by comparing the present invention with a prior art solar cell unit 110 and the resulting solar cell assembly 200.
According to an embodiment of the present invention, as shown in fig. 2, the notch 113 portion of the edge of the solar cell 110 'is adjacent to the non-notched edge of the adjacent solar cell 110 ", and the solder ribbon passes through the notch 113 of the first surface 111 of the solar cell 110' to connect the second surfaces 112 of the adjacent solar cells 110". Accordingly, fig. 3 shows a cross-sectional view at the recess 113 thereof. In addition, fig. 4 is a schematic structural diagram of the solar cell module 200; FIG. 5a is an EL diagram of a solar cell module 200; fig. 5b is a partially enlarged view of portion a in fig. 5 a.
When the solar cell 110 is formed by laser cutting and splitting, a laser-cut layer 114 and a split layer 115 are formed at the notches 113, respectively. Compared with the splinter layer 115, the laser-cut layer 114 has almost no stress or a stress value smaller than the threshold of the subfissure caused by the lamination process, and the splinter layer 115 is splinted by a certain mechanical force, so that a certain stress is generated in the splinter process, and a certain subfissure or crack may be further generated.
As shown in fig. 2 to 3, the laser-cut layer 114 is provided as a first surface, that is, the solder ribbon 120 is connected to the laser-cut layer 114 in the recess 113 by welding and is penetrated therefrom to be connected to a second surface (the splitting layer 115) of the adjacent solar cell 110. The solar cell module 200 is subjected to EL scanning, which is a near-infrared image of the module captured by a high-resolution CCD camera and allows the internal state of the solar cell module to be observed. As shown in fig. 5b, it can be seen that the notch 113 of the solar cell 110 has no subfissure, and the assembly effect is better.
According to the prior art, as shown in fig. 6-7, the notch 113 of the edge of the solar cell 110 'is partially adjacent to the non-notched edge of the adjacent solar cell 110 ", and the solder ribbon passes through the notch 113 of the second surface 112 (i.e. the surface where the lobe layer 115 is located) of the solar cell 110' to connect the first surface 111 (i.e. the surface where the laser cutting layer 114 is located) of the adjacent solar cell 110". Fig. 8a is an EL diagram showing a solar cell module 200 obtained from the solar cell string 100; fig. 8B is a partially enlarged view of portion B in fig. 8 a.
As shown in fig. 8b, as the above analysis shows, due to the existence of a certain stress, hidden crack, and crack in the split layer 115, when the stress is greater than the threshold value during lamination, as the pressure applied to the solar cell string 100 increases, the stress further increases to cause the crack, and the hidden crack and crack further propagate to cause hidden crack of the solar cell 110 during lamination.
Compared with the two examples, the scheme of the invention can reduce the probability of the hidden crack of the solar cell unit with the notch in the lamination process and improve the qualification rate of products compared with the scheme of the prior art.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention as defined in the appended claims.
The various features, aspects, and advantages of the present invention may also be embodied in the various aspects described in the following clauses, which may be combined in any combination:
1. a string of solar cells, comprising:
a plurality of solar battery units connected in series, wherein a plurality of notches are formed on one side edge of each solar battery unit, each solar battery unit is provided with a first surface and a second surface opposite to the first surface,
the plurality of solar battery units are arranged in a row according to the consistent notch direction, two adjacent solar battery units are connected through a welding strip,
the solder strip is connected with a first surface of one solar cell unit and connected with a second surface of another solar cell unit through a notch of the solder strip, wherein the position of the notch corresponding to the first surface is a laser cutting defect layer, and the position of the notch corresponding to the second surface is a splitting defect layer.
2. The solar cell string according to clause 1, wherein the solar cell units are sliced solar cells.
3. The solar cell string according to clause 2, wherein the solar cell unit is prepared by:
providing the solar cell;
cutting lines with regular concave-convex shapes are arranged from one side edge of the first surface of the solar cell piece through laser cutting;
and splitting the solar cell along the cutting line of the solar cell to obtain two sliced solar cells, wherein the notch is formed at one side edge of one sliced solar cell.
4. The solar cell string according to clause 2, wherein the solar cell unit is prepared by:
preparing a solar cell piece with through holes, wherein a plurality of through holes are formed in the first surface of the solar cell piece through laser;
setting a cutting line by laser cutting from the first surface of the solar cell piece, wherein the cutting line extends along a first direction and penetrates through the through holes;
and splitting along the cutting lines of the solar cell sheet to obtain two solar cell units.
5. The solar cell string according to clause 3 or 4, wherein the depth of the cutting line is 10-90% of the thickness of the solar cell sheet.
6. The solar cell string according to clause 1, wherein the number of the notches is equal to the number of the main grids of the solar cell units, and the plurality of notches are respectively arranged in the extending direction of the main grids of the solar cell units in a one-to-one correspondence manner.
7. The solar cell string according to clause 1, wherein the planar shape of the notch is formed into an arc shape, a rectangular shape, a trapezoidal shape, or a polygonal shape.
8. According to the solar cell string in item 1, the distance between two adjacent solar cell units is-2.0 mm.
9. A manufacturing method of a solar cell string comprises the following steps:
providing a plurality of solar battery units, wherein a plurality of notches are formed on one side edge of each solar battery unit, and each solar battery unit is provided with a first surface and a second surface opposite to the first surface;
arranging a plurality of solar battery units in a row according to a mode that the directions of the notches are consistent;
and connecting two adjacent solar battery units in series by using a welding strip, wherein the welding strip is connected with the first surface of one solar battery unit and is connected with the second surface of the other solar battery unit through a notch of the welding strip, the position of the notch corresponding to the first surface is a laser cutting defect layer, and the position of the notch corresponding to the second surface is a splintering defect layer.
10. The method of making a solar cell string of clause 9, wherein the solar cell units are sliced solar cells.
11. The method of making a solar cell string according to clause 10, wherein the solar cell unit is prepared by:
providing the solar cell;
cutting lines with regular concave-convex shapes are arranged from one side edge of the first surface of the solar cell piece through laser cutting;
and splitting the solar cell along the cutting line of the solar cell to obtain two sliced solar cells, wherein the notch is formed at one side edge of one sliced solar cell.
12. The method of making a solar cell string according to clause 10, wherein the solar cell unit is prepared by:
preparing a solar cell piece with through holes, wherein a plurality of through holes are formed in the first surface of the solar cell piece through laser;
setting a cutting line by laser cutting from the first surface of the solar cell piece, wherein the cutting line extends along a first direction and penetrates through the through holes;
and splitting along the cutting lines of the solar cell sheet to obtain two solar cell units.
13. The method for manufacturing a solar cell string according to clause 3 or 4, wherein the depth of the cutting line is 10-90% of the thickness of the solar cell sheet.
14. The method of claim 9, wherein the number of the notches is equal to the number of the main grids of the solar cell unit, and the plurality of notches are respectively arranged in the extending direction of the main grids of the solar cell unit in a one-to-one correspondence manner.
15. The method of manufacturing a solar cell string according to clause 9, wherein the planar shape of the notch is formed into an arc shape, a rectangular shape, a trapezoidal shape, or a polygonal shape.
16. According to the method for manufacturing the solar cell string in item 9, the distance between two adjacent solar cell units is-2.0 mm.
17. A solar cell module comprising the solar cell string of any one of clauses 1 to 8.
18. A solar cell module manufacturing method comprises the following steps:
manufacturing a solar cell string according to any one of the manufacturing methods of the solar cell strings of clauses 9 to 16;
and carrying out lamination laying and lamination on the solar cell string to obtain the solar cell module.
Claims (10)
1. A solar cell string, comprising:
a plurality of solar battery units connected in series, wherein a plurality of notches are formed on one side edge of each solar battery unit, each solar battery unit is provided with a first surface and a second surface opposite to the first surface,
the plurality of solar battery units are arranged in a row according to the consistent notch direction, two adjacent solar battery units are connected through a welding strip,
the solder strip is connected with a first surface of one solar cell unit and connected with a second surface of another solar cell unit through a notch of the solder strip, wherein the position of the notch corresponding to the first surface is a laser cutting defect layer, and the position of the notch corresponding to the second surface is a splitting defect layer.
2. The string of solar cells of claim 1, wherein the solar cell units are sliced solar cells.
3. The solar cell string according to claim 2, wherein the solar cell unit is prepared by:
providing the solar cell;
cutting lines with regular concave-convex shapes are arranged from one side edge of the first surface of the solar cell piece through laser cutting;
and splitting the solar cell along the cutting line of the solar cell to obtain two sliced solar cells, wherein the notch is formed at one side edge of one sliced solar cell.
4. The solar cell string according to claim 2, wherein the solar cell unit is prepared by:
preparing a solar cell piece with through holes, wherein a plurality of through holes are formed in the first surface of the solar cell piece through laser;
setting a cutting line by laser cutting from the first surface of the solar cell piece, wherein the cutting line extends along a first direction and penetrates through the through holes;
and splitting along the cutting lines of the solar cell sheet to obtain two solar cell units.
5. The solar cell string according to claim 3 or 4, wherein the cutting lines have a depth of 10 to 90% of the thickness of the solar cell sheet.
6. The solar cell string according to claim 1, wherein the number of the notches is equal to the number of the main grids of the solar cell unit, and a plurality of the notches are respectively arranged in a one-to-one correspondence in an extending direction of the main grids of the solar cell unit.
7. The solar cell string according to claim 1, wherein the planar shape of the notch is formed in an arc shape, a rectangular shape, a trapezoidal shape, or a polygonal shape.
8. A method for manufacturing a solar cell string is characterized by comprising the following steps:
providing a plurality of solar battery units, wherein a plurality of notches are formed on one side edge of each solar battery unit, and each solar battery unit is provided with a first surface and a second surface opposite to the first surface;
arranging a plurality of solar battery units in a row according to a mode that the directions of the notches are consistent;
and connecting two adjacent solar battery units in series by using a welding strip, wherein the welding strip is connected with the first surface of one solar battery unit and is connected with the second surface of the other solar battery unit through a notch of the welding strip, the position of the notch corresponding to the first surface is a laser cutting defect layer, and the position of the notch corresponding to the second surface is a splintering defect layer.
9. A solar cell module comprising the solar cell string according to any one of claims 1 to 7.
10. A method for manufacturing a solar cell module is characterized by comprising the following steps:
the method for manufacturing the solar cell string according to claim 8;
and carrying out lamination laying and lamination on the solar cell string to obtain the solar cell module.
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| CN111755549B (en) * | 2020-06-24 | 2022-09-06 | 北京晶澳能源科技有限公司 | Photovoltaic cell string and photovoltaic module |
| CN112038435A (en) * | 2020-09-28 | 2020-12-04 | 东方日升新能源股份有限公司 | Heterojunction battery assembly and preparation method thereof |
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