CN112234108A - Strip-shaped cell piece, solar cell piece and preparation method thereof, photovoltaic module and preparation method thereof - Google Patents
Strip-shaped cell piece, solar cell piece and preparation method thereof, photovoltaic module and preparation method thereof Download PDFInfo
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- CN112234108A CN112234108A CN201910576223.5A CN201910576223A CN112234108A CN 112234108 A CN112234108 A CN 112234108A CN 201910576223 A CN201910576223 A CN 201910576223A CN 112234108 A CN112234108 A CN 112234108A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 36
- 230000005684 electric field Effects 0.000 claims abstract description 82
- 239000011347 resin Substances 0.000 claims abstract description 11
- 229920005989 resin Polymers 0.000 claims abstract description 11
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 59
- 229910052710 silicon Inorganic materials 0.000 claims description 59
- 239000010703 silicon Substances 0.000 claims description 59
- 230000001070 adhesive effect Effects 0.000 claims description 58
- 239000000853 adhesive Substances 0.000 claims description 57
- 239000000758 substrate Substances 0.000 claims description 46
- 238000000034 method Methods 0.000 claims description 10
- 238000007639 printing Methods 0.000 claims description 10
- 238000007650 screen-printing Methods 0.000 claims description 8
- 238000004519 manufacturing process Methods 0.000 claims description 7
- 239000002344 surface layer Substances 0.000 claims description 7
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 7
- 229910052782 aluminium Inorganic materials 0.000 description 7
- 238000003466 welding Methods 0.000 description 5
- 239000011248 coating agent Substances 0.000 description 4
- 238000000576 coating method Methods 0.000 description 4
- 229910052581 Si3N4 Inorganic materials 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000010030 laminating Methods 0.000 description 3
- 238000010008 shearing Methods 0.000 description 3
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 229910052709 silver Inorganic materials 0.000 description 3
- 239000004332 silver Substances 0.000 description 3
- 238000012360 testing method Methods 0.000 description 3
- 229910004205 SiNX Inorganic materials 0.000 description 2
- 238000004140 cleaning Methods 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 230000005574 cross-species transmission Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000005253 cladding Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 238000009792 diffusion process Methods 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000000608 laser ablation Methods 0.000 description 1
- 238000010297 mechanical methods and process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 238000013082 photovoltaic technology Methods 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
- 238000005507 spraying 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
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
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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
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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
- H01L31/1804—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof comprising only elements of Group IV of the Periodic Table
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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
- Y02E10/547—Monocrystalline silicon PV cells
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The invention provides a strip-shaped cell, a solar cell and a preparation method thereof, and a photovoltaic module and a preparation method thereof. Through at least part contact electrode outstanding back of the body electric field setting, can make conducting resin and contact electrode fully contact, reduce contact resistance, increase the subassembly power, solve the bad problem of EL bright and dark piece simultaneously.
Description
Technical Field
The invention relates to the field of photovoltaics, in particular to a strip-shaped cell piece applied to a laminated tile assembly, a solar cell piece and a preparation method thereof, and a photovoltaic assembly and a preparation method thereof.
Background
With the rapid development of photovoltaic technology, photovoltaic power stations occupy a large market at home and abroad, the demand for high-power components is increasing, the cost of the photovoltaic components is reduced, the efficiency and the reliability of the photovoltaic components are improved, and the photovoltaic power generation is always in the direction of effort.
The laminated assembly is characterized in that the edges of the adjacent battery pieces are slightly overlapped, namely the edge of the front surface of one battery piece is arranged below the back surface of the adjacent battery piece, and the surface silver electrodes of the adjacent battery pieces are electrically connected by adopting a conductive material at the overlapping position, so that the assembly area is utilized to the maximum extent by eliminating piece gaps, and the assembly power is improved.
However, the conventional stack assembly generally has the problem that the contact between the conductive material and the silver electrode is insufficient, so that the yield of the assembly is influenced.
Disclosure of Invention
The invention aims to provide a strip-shaped cell piece applied to a laminated tile assembly, a solar cell piece and a preparation method thereof, and a photovoltaic assembly and a preparation method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the strip-shaped battery piece comprises a silicon substrate, a back electric field and a contact electrode, wherein the back electric field and the contact electrode are positioned on the back surface of the silicon substrate, the contact electrode is positioned on one side edge of the silicon substrate, and at least part of the contact electrode protrudes out of the back electric field.
Further, the contact electrode is arranged on one side of the back electric field, which is far away from the silicon substrate; or, part of the contact electrode is positioned in the back electric field, and the other part of the contact electrode is positioned on the side of the back electric field, which faces away from the silicon base.
Further, the surface of the contact electrode has an accommodating portion recessed inward; the surface of the contact electrode is provided with a plurality of independent or communicated grooves, or the surface of the contact electrode is wholly in at least one of a groove shape, a stripe shape or a sawtooth shape, and the grooves, or parts between adjacent stripes, or wave troughs or tooth troughs form the accommodating part.
Further, the width of the contact electrode is between 0.2mm and 1.4mm, and the back electric field is 0.4mm wider than the contact electrode.
In order to achieve the purpose of the invention, the invention also adopts another technical scheme that:
the utility model provides a solar cell piece, includes a plurality of bar battery regions, wherein, each bar battery region includes silicon-based, is located the back of the body electric field and the contact electrode at the silicon-based back, the contact electrode is located a side edge in bar battery region, at least part the contact electrode is outstanding the setting of back of the body electric field.
Further, the surface of the contact electrode is provided with an accommodating part which is concave inwards; the surface of the contact electrode is provided with a plurality of independent or communicated grooves, or the surface of the contact electrode is wholly in at least one of a groove shape, a stripe shape or a sawtooth shape, and the grooves, or parts between adjacent stripes, or wave troughs or tooth troughs form the accommodating part.
Further, the solar cell sheet comprises 6 strip-shaped cell areas separated by 5 contact electrodes, wherein the strip-shaped cell areas on two sides of the middle contact electrode are symmetrically arranged, and the width of the middle contact electrode is twice that of the other contact electrodes.
Furthermore, the width of other contact electrodes except the middle contact electrode is between 0.2mm and 1.4mm, and the back electric field is 0.4mm wider than the contact electrodes.
In order to achieve the purpose of the invention, the invention also adopts another technical scheme that:
the utility model provides a photovoltaic module, includes a plurality of bar battery pieces, the bar battery piece includes silicon-based, is located the back of the body electric field and the contact electrode at the silicon-based back, the contact electrode is located a lateral margin of silicon-based, at least part the contact electrode is outstanding back of the body electric field sets up, adjacent two the edge of bar battery piece is passed through conducting resin stack and is connected.
Further, the conductive adhesive covers the part of the contact electrode protruding out of the back electric field.
Further, the surface of the contact electrode is provided with an accommodating part which is sunken inwards, and part of the conductive adhesive is positioned in the accommodating part.
Further, the width of the conductive adhesive is not more than the overlapping width of two adjacent strip-shaped battery pieces, and the overlapping width is between 0.3mm and 1.8 mm.
In order to achieve the purpose of the invention, the invention also adopts another technical scheme that:
a preparation method of a solar cell comprises the following steps:
preparing a back electric field on the back of the silicon substrate;
and preparing a contact electrode on the side of the back electric field, which is far away from the silicon substrate, wherein the contact electrode is positioned on one side edge of the silicon substrate.
In order to achieve the purpose of the invention, the invention also adopts another technical scheme that:
a preparation method of a solar cell comprises the following steps:
preparing a back electric field on the back of the silicon substrate;
removing the surface layer of the surface of the back electric field departing from the silicon substrate, which corresponds to the contact electrode;
and preparing a contact electrode at the position of removing the surface layer, wherein part of the contact electrode protrudes out of the back electric field, and the contact electrode is positioned at one side edge of the silicon substrate.
Further, a contact electrode having a receiving portion recessed inward on the surface thereof is prepared by a screen printing method based on a screen having a projection.
Further, 5 contact electrodes are prepared and distributed at equal intervals, wherein the contact electrodes on two sides of the middle contact electrode are symmetrically arranged, and the width of the middle contact electrode is twice that of the other contact electrodes.
In order to achieve the purpose of the invention, the invention also adopts another technical scheme that:
a preparation method of a photovoltaic module comprises the following steps:
scribing a solar cell piece, wherein the solar cell piece comprises a plurality of strip-shaped cell areas, at least part of contact electrodes of the strip-shaped cell areas protrude out of a back electric field, and the contact electrodes are located on one side edge of the strip-shaped cell areas;
printing conductive adhesive at the position where the back surface of the solar cell is provided with the contact electrode;
breaking the battery pieces into strip-shaped battery pieces according to the number of the divided pieces;
overlapping the contact electrode printed with the conductive adhesive with the positive electrode of the adjacent strip-shaped battery piece;
and curing the conductive adhesive.
Further, the overlapping of the contact electrode printed with the conductive adhesive and the positive electrode of the adjacent strip-shaped battery piece comprises:
integrally rotating a plurality of strip-shaped battery pieces positioned on one side of the central line of the solar battery piece by 180 degrees in the plane of the solar battery piece;
and overlapping the strip-shaped battery pieces obtained after rotation one by one.
In order to achieve the purpose of the invention, the invention also adopts another technical scheme that:
a preparation method of a photovoltaic module comprises the following steps:
printing conductive adhesive at a position where a contact electrode is arranged on the back surface of the strip-shaped battery piece, wherein at least part of the contact electrode protrudes out of the back electric field, and the contact electrode is positioned at the edge of one side of the strip-shaped battery area;
overlapping the contact electrode printed with the conductive adhesive with the positive electrode of the adjacent strip-shaped battery piece;
and curing the conductive adhesive.
Further, the conductive adhesive covers the part of the contact electrode protruding out of the back electric field.
The invention has the beneficial effects that: according to the strip-shaped battery piece, at least part of the contact electrode protrudes out of the back electric field, so that the conductive adhesive can be fully contacted with the contact electrode, the contact resistance is reduced, the component power is increased, and the problem of poor EL bright and dark pieces is solved.
Drawings
FIG. 1 is a schematic backside view of a solar cell in accordance with a preferred embodiment of the present invention;
fig. 2 is a state diagram of the solar cell shown in fig. 1 after being broken;
fig. 3 is a laminated state diagram of a part of the strip-shaped battery piece in fig. 2 after being integrally rotated by 180 degrees;
FIG. 4 is a cross-sectional view taken along A-A of the area 101 of FIG. 1 in accordance with the present invention;
FIG. 5 is a schematic view after applying conductive paste at FIG. 4;
FIG. 6 is a schematic view of a photovoltaic module according to a preferred embodiment of the present invention;
fig. 7 is a schematic structural view of a photovoltaic device according to another preferred embodiment of the present invention.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
The present application will now be described in detail with reference to specific embodiments thereof as illustrated in the accompanying drawings. These embodiments are not intended to limit the present application, and structural, methodological, or functional changes made by those skilled in the art according to these embodiments are included in the scope of the present application.
In the various illustrations of the present application, certain dimensions of structures or portions may be exaggerated relative to other structures or portions for ease of illustration and, thus, are provided to illustrate only the basic structure of the subject matter of the present application.
Referring to fig. 1 to 5, a solar cell according to a preferred embodiment of the invention includes a plurality of strip-shaped battery regions that are not cut apart; after cutting, each bar battery zone constitutes a bar battery piece, the bar battery piece passes through the edge stack and connects and constitute the shingling subassembly.
As will be understood by those skilled in the art, each strip-shaped battery region corresponds to a strip-shaped battery piece, and the structures of the strip-shaped battery region and the strip-shaped battery piece are the same.
The strip-shaped battery piece comprises a silicon substrate 1, a back electric field 4 and a contact electrode 3, wherein the back electric field 4 is positioned on the back surface of the silicon substrate 1; the contact electrode 3 is located at one side edge of the silicon substrate 1, at least part of the contact electrode 3 protrudes from the back electric field 4, when a tile stack assembly is formed through the conductive adhesive 5, the conductive adhesive 5 coats the contact electrode 3 protruding from the back electric field 4, so that the conductive adhesive 5 is fully contacted with the contact electrode 3, the contact resistance is reduced, the assembly power is increased, and meanwhile, the problem of poor EL light and dark sheets is solved.
As will be understood by those skilled in the art, in the "back electric field 4 and contact electrode 3 located on the back surface of the silicon substrate 1", the specific positional relationship between the back electric field 4 and the contact electrode 3 is as described below; the phrase "located on the back surface of the silicon substrate 1" does not particularly mean that the back electric field 4 and the contact electrode 3 are directly disposed on the back surface of the silicon substrate 1, but also includes the case that the back electric field 4 and the contact electrode 3 are disposed on the surface of the silicon substrate 1 with the back surface coated with the coating film 2 such as silicon nitride or silicon oxide film, and the silicon substrate 1 can be understood as a simple silicon substrate layer, or the silicon substrate 1 is a silicon substrate with the back surface coated with the coating film 2 such as silicon nitride or silicon oxide film.
When a silicon substrate with a plated film 2 is selected, in the area 101 in fig. 1, grooves need to be formed in the plated film 2 along the direction of the thin gate lines, so that the back aluminum can contact with the silicon substrate 1 to collect carriers, and in the area 102, grooves are not generally needed.
Preferably, the contact electrode 3 is arranged on a side of the back electric field 4 facing away from the silicon substrate 1; the preparation process is simple, only one surface of the contact electrode 3 facing the back electric field 4 is covered by the back electric field 4, the other surfaces of the contact electrode are exposed outwards, and the contact area of the contact electrode and the conductive adhesive 5 is large.
Or, a part of the contact electrode 3 is located in the back electric field 4, and another part of the contact electrode 3 is located on a side of the back electric field 4 facing away from the silicon substrate 1. That is, a portion of the contact electrode 3 is embedded in the back electric field 4 in the thickness direction of the silicon substrate 1.
Further, the surface of the contact electrode 3 has an inward concave accommodating portion, and the surface of the contact electrode 3 refers to the surface of the portion of the contact electrode 3 protruding out of the back electric field 4, that is, the surface exposed outward without being covered by the back electric field 4; the shape, the concave depth and the area size of the accommodating part are not limited, so long as compared with any point on the surface, or any edge, or any region, the accommodating part of the conductive adhesive 5 can be used for accommodating the anti-overflow adhesive effect when the laminated tile assembly is formed by the conductive adhesive 5.
The surface of the contact electrode 3 is provided with a plurality of independent or communicated grooves, or the surface of the contact electrode 3 is integrally in one of a groove shape, a stripe shape or a sawtooth shape. It will be understood by those skilled in the art that when the surface of the contact electrode 3 has a groove, the groove constitutes the receiving portion; when the surface of the contact electrode 3 is in a stripe shape, the part between adjacent stripes forms the accommodating part; when the contact electrode 3 is corrugated, the valley portion constitutes the receiving portion, and when the contact electrode 3 is serrated, the valley portion constitutes the receiving portion.
The thinner the contact electrode 3, the lower the paste cost, but the higher the resistance and the higher the weld alignment requirements. Generally, the width of the contact electrode 3 is between 0.2mm and 1.4mm, the back electric field 4 is 0.4mm wider than the contact electrode 3, and the contact electrode 3 is centrally arranged on the back electric field 4, so that the requirements of resistance and welding can be met, and the cost is relatively low.
In a specific embodiment, the back electric field 4 is an aluminum back field formed by aluminum paste; the contact electrode 3 is a silver electrode, and other structures of the battery piece adopt the prior art, which is not described herein again.
In addition, include on the solar wafer 6 by 5 contact electrode 3 spaced apart strip battery region, wherein the strip battery region of 3 both sides of a middle contact electrode sets up symmetrically, and the width of a middle contact electrode 3 is the twice of the width of other contact electrodes 3, cuts from the positive centre of a middle contact electrode 3, can form two symmetrical strip battery pieces. The arrangement mode is convenient for arranging the strip-shaped battery pieces during subsequent forming of the laminated tile assembly.
The invention also provides a preparation method of the solar cell, which comprises the following steps: preparing a back electric field 4 on the back surface of the silicon substrate 1; preparing a contact electrode 3 on the side of the back electric field 4 opposite to the silicon substrate 1, wherein the contact electrode 3 is positioned on one side edge of the silicon substrate 1. In the solar cell prepared by the method, the contact electrode 3 protrudes out of the back electric field 4, only one surface of the contact electrode 3 facing the back electric field 4 is covered by the back electric field 4, other surfaces of the contact electrode are exposed outwards, and the contact area between the contact electrode 3 and the conductive adhesive 5 is large.
Wherein, the silicon substrate 1 is pure silicon substrate 1, or silicon substrate 1 with the back surface coated with coating film 2 such as silicon nitride or silicon oxide film. In addition, the preparation method of the solar cell further comprises the conventional steps of flocking, diffusion, coating 2 laser grooving, positive electrode preparation and the like, and the steps adopt the method and the preparation sequence of the prior art, and are not described again.
According to the preparation method of the solar cell, the back electric field 4 is prepared firstly, and then the contact electrode 3 is prepared, so that the field passivation effect of the contact electrode 3 area is improved, the contact electrode 3 is effectively prevented from diffusing into the silicon substrate 1, and no leakage current occurs; and at least part of the contact electrode 3 can be arranged to protrude from the back electric field 4, so as to facilitate welding to form a battery string.
Further, a contact electrode 3 having a receiving portion recessed inward on the surface thereof is prepared, and when the strip-shaped battery cells are formed into a stack assembly, the conductive paste 5 is received in the receiving portion to prevent the paste from overflowing. Specifically, the contact electrode 3 is prepared by adopting a screen printing mode, wherein a convex part which is complementary with the accommodating part is arranged on the screen printing plate so as to form the contact electrode 3 with the accommodating part by printing; that is, the contact electrode 3 having the receiving portion recessed inward on the surface thereof is prepared by screen printing based on the screen having the projecting portion.
In one embodiment, the method for manufacturing a solar cell comprises:
firstly, etching and cleaning a silicon wafer;
diffusing to form PN junction;
thirdly, etching and cleaning;
plating a SiNx film;
laser grooving is carried out on the SiNx film along the direction of the fine grid;
sixthly, adopting aluminum paste to screen print the back electric field 4, and enabling the aluminum paste to form ohmic contact with Si through the groove. Of course, the present disclosure is not limited to full back-side aluminum (single sided cells), or partial back-side aluminum (double sided cells);
seventhly, screen printing a contact electrode 3;
screen printing positive electrode;
ninthly, sintering;
and (8) performing testing and sorting on the red.
The invention also provides another preparation method of the solar cell, which is different from any one of the preparation methods of the solar cell only in that: preparing a back electric field 4 on the back surface of the silicon substrate 1; removing the surface layer of the back electric field 4 on the surface departing from the silicon substrate 1 and at the position corresponding to the contact electrode 3; preparing a contact electrode 33 at the position of removing the surface layer, wherein the contact electrode 3 is positioned at one side edge of the silicon substrate 1; other steps are not described in detail. The method provided by the embodiment can enable part of the contact electrode 3 to be sunk into the back electric field 4 layer, so that the protruding height of the contact electrode 3 on the surface of the battery can be reduced on the premise of ensuring the current collection effect of the contact electrode 3, and the yield of the laminated assembly is improved.
The surface layer can be removed by laser ablation, mechanical method, chemical agent etching method, etc. in the prior art, which are not described herein again.
Referring to fig. 6 and 7 in combination with fig. 1, 4 to 5, the invention further provides a photovoltaic module, which includes any one of the strip-shaped battery pieces, at least a portion of the contact electrode 3 protrudes from the back electric field 4, the shape of the positive electrode is not limited, and the edges of two adjacent strip-shaped battery pieces are connected by overlapping with each other through the conductive adhesive 5.
Specifically, the one end of conducting resin 5 is connected in the positive pole of a bar battery piece, and the other end is connected in the contact electrode 3 of another bar battery piece, conducting resin 5 cladding contact electrode 3, can better with contact electrode 3 contact becomes the face contact by original line contact, has fully increased area of contact, increases photovoltaic module power, improves the shearing force, further improves the subassembly reliability.
Preferably, as shown in fig. 5, the conductive adhesive 5 covers a portion of the contact electrode 3 protruding from the back electric field 4, that is, the conductive adhesive 5 covers the contact electrode 3 which is not covered by the back electric field 4. It can be understood by those skilled in the art that the conductive adhesive 5 does not cover all the contact electrodes 3, but covers all the contact electrodes 3 in the area coated with the conductive adhesive 5, so that the conductive adhesive 5 is fully contacted with the contact electrodes 3, the contact resistance is reduced, the power of the device is increased, and the problem of poor EL brightness is solved.
Further, the surface of contact electrode 3 has inside sunken portion of holding, part conducting resin 5 is located contact electrode 3's portion of holding, can effectively prevent to overflow and glue, avoids conducting resin 5 to spill over bar battery piece and causes positive negative pole short circuit etc..
Furthermore, the width of the conductive adhesive 5 is not greater than the overlapping width of two adjacent battery pieces, so that the adhesive can be effectively prevented from overflowing in the preparation process, and the situation that the conductive adhesive 5 overflows the battery pieces to cause short circuit of the positive electrode and the negative electrode is avoided. The preferable overlapping width is between 0.3mm and 1.8mm, so that good overlapping connection effect can be ensured, and the effective utilization rate of the strip-shaped battery piece can be improved.
The invention also provides a preparation method of the photovoltaic module, which comprises the following steps: scribing any one of the solar cell pieces, wherein the solar cell piece comprises a plurality of strip-shaped cell areas which are not cut and separated, at least part of contact electrodes 3 of the strip-shaped cell areas protrude out of a back electric field setting 4, and the contact electrodes 3 are located on one side edge of the strip-shaped cell areas; printing a conductive adhesive 5 at the position where the back surface of the solar cell is provided with the contact electrode 3; as shown in fig. 2, the battery pieces are broken into strip shapes according to the number of the divided pieces; laminating, namely overlapping the contact electrode 3 printed with the conductive adhesive 5 with the positive electrode of the adjacent strip-shaped battery piece; the conductive paste 5 is cured.
In the preparation method, at least part of the contact electrode 3 protrudes out of the back electric field 4, the conductive adhesive 5 can coat the contact electrode 3, can be better contacted with the contact electrode 3, and is changed from original line contact into surface contact, so that the contact area is fully increased, the power of the photovoltaic module is increased, the shearing force is improved, and the reliability of the module is further improved.
Further, the surface of contact electrode 3 has inside sunken portion of holding, part conducting resin 5 is located contact electrode 3's portion of holding, can effectively prevent to overflow and glue, avoids conducting resin 5 to spill over bar battery piece and causes positive negative pole short circuit etc..
The overlapping of the contact electrode 3 printed with the conductive adhesive 5 and the positive electrode of the adjacent strip-shaped battery piece comprises the following steps: integrally rotating a plurality of strip-shaped battery pieces positioned on one side of the central line of the solar battery piece by 180 degrees in the plane of the solar battery piece; and overlapping the strip-shaped battery pieces obtained after rotation one by one.
In a specific embodiment, the solar cell sheet comprises 6 strip-shaped cell regions separated by 5 contact electrodes 3, wherein the strip-shaped cell regions on two sides of the middle contact electrode 3 are symmetrically arranged, and the width of the middle contact electrode 3 is twice that of the other contact electrodes 3; after the battery pieces are broken off according to the illustration in fig. 2, the three battery pieces on the right side are rotated 180 degrees integrally and then overlapped with the three battery pieces on the left side according to the illustration in fig. 3.
In addition, the preparation method of the photovoltaic module further comprises conventional steps of bus bar welding, testing and the like, and the steps adopt the method and the preparation sequence of the prior art, and are not described again.
In one embodiment, the method of manufacturing a photovoltaic device comprises: dividing the battery into N pieces, for example, dividing the battery into 2-6 pieces; printing a conductive adhesive 5, forming the conductive adhesive 5 at the contact electrode 3 in a printing or spraying manner, wherein the accommodating part on the surface of the contact electrode 3 can play a role of preventing the adhesive overflow, so that the printing width of the conductive adhesive 5 is not more than the overlapping width, and the short circuit of the positive electrode and the negative electrode caused by the overflow of the conductive adhesive 5 over the battery piece is avoided; breaking the battery pieces, namely breaking the battery pieces into 2-6 parts according to the number of the broken battery pieces; laminating, namely overlapping the contact electrode 3 printed with the conductive adhesive 5 with the positive electrode of the battery piece, wherein the overlapping width is 0.3-1.8 mm; curing, heating through a belt or an electromagnetic welding head/an infrared lamp box to cure the conductive adhesive 5; welding the bus bar; seventhly, visual inspection of the appearance; EL test of battery string, etc.
The invention also provides another preparation method of the photovoltaic module, which is different from the preparation method only in that the preparation method comprises the following steps: printing conductive adhesive at the position where the back surface of any one of the strip-shaped battery pieces is provided with a contact electrode 3, wherein at least part of the contact electrode 3 protrudes out of a back electric field 4, and the contact electrode 3 is positioned at the edge of one side of the strip-shaped battery area; laminating, namely overlapping the contact electrode printed with the conductive adhesive with the positive electrode of the adjacent strip-shaped battery piece; and curing the conductive adhesive.
The strip-shaped cell piece can be formed by cutting the solar cell piece prepared by any one of the above solar cell piece preparation methods; the structure and other processes of the strip-shaped battery piece refer to the preparation method, and are not described in detail herein.
Further, based on any one of the above photovoltaic module manufacturing methods, the adjacent strip-shaped battery pieces are stacked through the conductive adhesive 5, so that low-temperature stacking connection can be achieved. Specifically, the curing temperature of the conductive adhesive 5 is between 60 ℃ and 250 ℃, preferably between 60 ℃ and 200 ℃, and more preferably between 60 ℃ and 150 ℃; the overlapping of adjacent strip-shaped battery pieces can be realized at a lower temperature, and the adhesive force between the contact electrode 3 and the back electric field 4 can be ensured.
In summary, in the invention, at least part of the contact electrode 3 protrudes from the back electric field 4, so that the conductive adhesive 5 can be fully contacted with the contact electrode 3, the contact resistance is reduced, the component power is increased, and the problem of poor EL light and shade is solved; and through be provided with the holding part on contact electrode 3 surface, thereby when forming the shingling subassembly, part conducting resin 5 is located the holding part, conducting resin 5 can better with contact electrode 3 contact, becomes the face contact from original line contact, has fully increased area of contact, increases photovoltaic module power, improves the shearing force, further improves the subassembly reliability.
It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.
The above list of details is only for the concrete description of the feasible embodiments of the present application, they are not intended to limit the scope of the present application, and all equivalent embodiments or modifications that do not depart from the technical spirit of the present application are intended to be included within the scope of the present application.
Claims (20)
1. The strip-shaped battery piece comprises a silicon substrate, a back electric field and a contact electrode, wherein the back electric field and the contact electrode are positioned on the back surface of the silicon substrate, and the contact electrode is positioned on one side edge of the silicon substrate, and the strip-shaped battery piece is characterized in that: at least part of the contact electrode protrudes beyond the back electric field arrangement.
2. Strip cell of claim 1, wherein: the contact electrode is arranged on one side of the back electric field, which is far away from the silicon substrate; or, part of the contact electrode is positioned in the back electric field, and the other part of the contact electrode is positioned on the side of the back electric field, which faces away from the silicon base.
3. Strip-shaped battery piece according to claim 1 or 2, characterized in that: the surface of the contact electrode is provided with an accommodating part which is sunken inwards; the surface of the contact electrode is provided with a plurality of independent or communicated grooves, or the surface of the contact electrode is wholly in at least one of a groove shape, a stripe shape or a sawtooth shape, and the grooves, or parts between adjacent stripes, or wave troughs or tooth troughs form the accommodating part.
4. Strip cell of claim 1, wherein: the width of the contact electrode is between 0.2mm and 1.4mm, and the back electric field is 0.4mm wider than the contact electrode.
5. The utility model provides a solar cell piece, includes a plurality of bar battery regions, wherein, every bar battery region includes silicon-based, is located the back of the body electric field and the contact electrode of silicon-based back, the contact electrode is located one side edge in bar battery region, its characterized in that: at least part of the contact electrode protrudes beyond the back electric field arrangement.
6. The solar cell sheet according to claim 5, wherein: and the surface of the contact electrode is provided with an accommodating part which is sunken inwards; the surface of the contact electrode is provided with a plurality of independent or communicated grooves, or the surface of the contact electrode is wholly in at least one of a groove shape, a stripe shape or a sawtooth shape, and the grooves, or parts between adjacent stripes, or wave troughs or tooth troughs form the accommodating part.
7. The solar cell sheet according to claim 5, wherein: the solar cell comprises 6 strip-shaped cell areas separated by 5 contact electrodes, wherein the strip-shaped cell areas on two sides of the middle contact electrode are symmetrically arranged, and the width of the middle contact electrode is twice that of other contact electrodes.
8. The solar cell sheet according to claim 7, wherein: the width of other contact electrodes except the middle contact electrode is between 0.2mm and 1.4mm, and the back electric field is 0.4mm wider than the contact electrodes.
9. The utility model provides a photovoltaic module, includes a plurality of bar battery pieces, the bar battery piece includes silicon-based, is located the back of the body electric field and the contact electrode at the silicon-based back, the contact electrode is located a lateral margin of silicon-based, its characterized in that, at least part the contact electrode is outstanding the setting of back of the body electric field, adjacent two the edge of bar battery piece is passed through conducting resin and is overlapped the connection.
10. The photovoltaic module of claim 9, wherein: and the conductive adhesive coats the part of the contact electrode protruding out of the back electric field.
11. The photovoltaic module of claim 9 or 10, wherein: the surface of the contact electrode is provided with an accommodating part which is sunken inwards, and part of the conductive adhesive is positioned in the accommodating part.
12. The photovoltaic module of claim 9, wherein: the width of the conductive adhesive is not more than the overlapping width of two adjacent strip-shaped battery pieces, and the overlapping width is between 0.3mm and 1.8 mm.
13. The preparation method of the solar cell is characterized by comprising the following steps:
preparing a back electric field on the back of the silicon substrate;
and preparing a contact electrode on the side of the back electric field, which is far away from the silicon substrate, wherein the contact electrode is positioned on one side edge of the silicon substrate.
14. The preparation method of the solar cell is characterized by comprising the following steps:
preparing a back electric field on the back of the silicon substrate;
removing the surface layer of the surface of the back electric field departing from the silicon substrate, which corresponds to the contact electrode;
and preparing a contact electrode at the position of removing the surface layer, wherein part of the contact electrode protrudes out of the back electric field, and the contact electrode is positioned at one side edge of the silicon substrate.
15. The method for producing a solar cell sheet according to claim 13 or 14, characterized in that: based on the screen printing plate with the convex part, the contact electrode with the accommodating part which is inwards concave on the surface is prepared by adopting a screen printing mode.
16. The method for producing a solar cell sheet according to claim 13 or 14, characterized in that: preparing 5 contact electrodes distributed at equal intervals, wherein the contact electrodes on two sides of the middle contact electrode are symmetrically arranged, and the width of the middle contact electrode is twice that of the other contact electrodes.
17. A preparation method of a photovoltaic module is characterized by comprising the following steps:
scribing a solar cell piece, wherein the solar cell piece comprises a plurality of strip-shaped cell areas, at least part of contact electrodes of the strip-shaped cell areas protrude out of a back electric field, and the contact electrodes are located on one side edge of the strip-shaped cell areas;
printing conductive adhesive at the position where the back surface of the solar cell is provided with the contact electrode;
breaking the battery pieces into strip-shaped battery pieces according to the number of the divided pieces;
overlapping the contact electrode printed with the conductive adhesive with the positive electrode of the adjacent strip-shaped battery piece;
and curing the conductive adhesive.
18. The method of manufacturing a photovoltaic module according to claim 17, wherein: the contact electrode printed with the conductive adhesive is overlapped with the positive electrode of the adjacent strip-shaped battery piece, and the method comprises the following steps:
integrally rotating a plurality of strip-shaped battery pieces positioned on one side of the central line of the solar battery piece by 180 degrees in the plane of the solar battery piece;
and overlapping the strip-shaped battery pieces obtained after rotation one by one.
19. A preparation method of a photovoltaic module is characterized by comprising the following steps:
printing conductive adhesive at a position where a contact electrode is arranged on the back surface of the strip-shaped battery piece, wherein at least part of the contact electrode protrudes out of the back electric field, and the contact electrode is positioned at the edge of one side of the strip-shaped battery area;
overlapping the contact electrode printed with the conductive adhesive with the positive electrode of the adjacent strip-shaped battery piece;
and curing the conductive adhesive.
20. A method for the production of a photovoltaic module according to claim 17 or 18 or 19, characterized in that: and the conductive adhesive coats the part of the contact electrode protruding out of the back electric field.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910576223.5A CN112234108A (en) | 2019-06-28 | 2019-06-28 | Strip-shaped cell piece, solar cell piece and preparation method thereof, photovoltaic module and preparation method thereof |
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| CN201910576223.5A CN112234108A (en) | 2019-06-28 | 2019-06-28 | Strip-shaped cell piece, solar cell piece and preparation method thereof, photovoltaic module and preparation method thereof |
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| CN112234108A true CN112234108A (en) | 2021-01-15 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023182352A1 (en) * | 2022-03-23 | 2023-09-28 | 株式会社カネカ | Method for manufacturing photovoltaic cell string, and photovoltaic cell string |
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2019
- 2019-06-28 CN CN201910576223.5A patent/CN112234108A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023182352A1 (en) * | 2022-03-23 | 2023-09-28 | 株式会社カネカ | Method for manufacturing photovoltaic cell string, and photovoltaic cell string |
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Address after: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Applicant after: CSI Cells Co.,Ltd. Applicant after: Changshu Artes Sunshine Power Technology Co.,Ltd. Applicant after: Atlas sunshine Power Group Co.,Ltd. Address before: No. 199, deer mountain road, Suzhou high tech Zone, Jiangsu Province Applicant before: CSI Cells Co.,Ltd. Applicant before: Changshu Artes Sunshine Power Technology Co.,Ltd. Applicant before: CSI SOLAR POWER GROUP Co.,Ltd. |