CN206558521U - One kind is without the full back contact solar cell component of grid line - Google Patents
One kind is without the full back contact solar cell component of grid line Download PDFInfo
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- CN206558521U CN206558521U CN201720081323.7U CN201720081323U CN206558521U CN 206558521 U CN206558521 U CN 206558521U CN 201720081323 U CN201720081323 U CN 201720081323U CN 206558521 U CN206558521 U CN 206558521U
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- 210000003850 cellular structure Anatomy 0.000 title claims abstract description 16
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 99
- 229910052802 copper Inorganic materials 0.000 claims abstract description 87
- 239000010949 copper Substances 0.000 claims abstract description 87
- 210000004027 cell Anatomy 0.000 claims abstract description 63
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims abstract description 38
- 238000002161 passivation Methods 0.000 claims abstract description 28
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 25
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 25
- 239000010703 silicon Substances 0.000 claims abstract description 25
- 238000003466 welding Methods 0.000 claims abstract description 23
- 239000011159 matrix material Substances 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 10
- 238000004804 winding Methods 0.000 claims description 11
- 230000003667 anti-reflective effect Effects 0.000 claims description 6
- 239000011230 binding agent Substances 0.000 claims description 6
- 239000003292 glue Substances 0.000 claims description 6
- 239000002245 particle Substances 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 5
- 238000004904 shortening Methods 0.000 claims description 5
- 238000007650 screen-printing Methods 0.000 claims description 4
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- KXGFMDJXCMQABM-UHFFFAOYSA-N 2-methoxy-6-methylphenol Chemical compound [CH]OC1=CC=CC([CH])=C1O KXGFMDJXCMQABM-UHFFFAOYSA-N 0.000 claims description 2
- 229910001316 Ag alloy Inorganic materials 0.000 claims description 2
- 229910001152 Bi alloy Inorganic materials 0.000 claims description 2
- 229910001074 Lay pewter Inorganic materials 0.000 claims description 2
- 239000004642 Polyimide Substances 0.000 claims description 2
- OLXNZDBHNLWCNK-UHFFFAOYSA-N [Pb].[Sn].[Ag] Chemical compound [Pb].[Sn].[Ag] OLXNZDBHNLWCNK-UHFFFAOYSA-N 0.000 claims description 2
- 238000005275 alloying Methods 0.000 claims description 2
- PCHJSUWPFVWCPO-UHFFFAOYSA-N gold Chemical compound [Au] PCHJSUWPFVWCPO-UHFFFAOYSA-N 0.000 claims description 2
- 229910052737 gold Inorganic materials 0.000 claims description 2
- 239000010931 gold Substances 0.000 claims description 2
- 239000002923 metal particle Substances 0.000 claims description 2
- 239000005011 phenolic resin Substances 0.000 claims description 2
- 229920001568 phenolic resin Polymers 0.000 claims description 2
- 239000004814 polyurethane Substances 0.000 claims description 2
- 229920002635 polyurethane Polymers 0.000 claims description 2
- 229920006259 thermoplastic polyimide Polymers 0.000 claims description 2
- 229920005992 thermoplastic resin Polymers 0.000 claims description 2
- 238000004519 manufacturing process Methods 0.000 abstract description 14
- 238000005516 engineering process Methods 0.000 abstract description 5
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 38
- 229910004205 SiNX Inorganic materials 0.000 description 21
- 229910052681 coesite Inorganic materials 0.000 description 19
- 229910052906 cristobalite Inorganic materials 0.000 description 19
- 239000000377 silicon dioxide Substances 0.000 description 19
- 229910052682 stishovite Inorganic materials 0.000 description 19
- 229910052905 tridymite Inorganic materials 0.000 description 19
- 238000000034 method Methods 0.000 description 17
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 11
- 229910052593 corundum Inorganic materials 0.000 description 11
- 229910001845 yogo sapphire Inorganic materials 0.000 description 11
- 239000000758 substrate Substances 0.000 description 10
- 238000009413 insulation Methods 0.000 description 9
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052751 metal Inorganic materials 0.000 description 7
- 238000007639 printing Methods 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000003475 lamination Methods 0.000 description 6
- 238000000151 deposition Methods 0.000 description 5
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- 230000008569 process Effects 0.000 description 5
- 238000000137 annealing Methods 0.000 description 4
- 230000008859 change Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 239000002002 slurry Substances 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010276 construction Methods 0.000 description 3
- 238000009792 diffusion process Methods 0.000 description 3
- 239000002019 doping agent Substances 0.000 description 3
- 238000005538 encapsulation Methods 0.000 description 3
- 238000005530 etching Methods 0.000 description 3
- 238000002360 preparation method Methods 0.000 description 3
- 229910052814 silicon oxide Inorganic materials 0.000 description 3
- 230000009466 transformation Effects 0.000 description 3
- 210000002268 wool Anatomy 0.000 description 3
- 239000013078 crystal Substances 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
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- 238000001465 metallisation Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000003854 Surface Print Methods 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000003698 laser cutting Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 238000007747 plating Methods 0.000 description 1
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- 239000000523 sample Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 238000005245 sintering Methods 0.000 description 1
Classifications
-
- 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
Abstract
The utility model discloses one kind without the full back contact solar cell component of grid line, the back contact solar baby battery piece contacted including multiple phases, baby battery piece is formed by the cutting of back contact solar cell piece, back contact solar cell piece includes n-type silicon matrix, the back side of n-type silicon matrix is provided with p+ doped regions and n+ doped regions, p+ doped regions and n+ doped regions are provided with backside passivation layer, backside passivation layer is provided with positive electrode contact site and negative electrode contact site, covered with scolding tin or conducting resinl on positive electrode contact site and negative electrode contact site, when adjacent two baby batteries piece is mutually contacted, copper cash is provided with the scolding tin or conducting resinl of positive electrode contact site, copper cash is also equipped with the scolding tin or conducting resinl of negative electrode contact site, adjacent two baby batteries piece is directly mutually contacted by copper cash, or adjacent two baby batteries piece is mutually contacted by copper cash with welding.The battery component can not only lift the reliability of full back contact battery component but also can reduce its technology difficulty and manufacturing cost.
Description
Technical field
The utility model belongs to area of solar cell, and in particular to one kind is without the full back contact solar cell group of grid line
Part.
Background technology
Solar cell is a kind of semiconductor devices for converting light energy into electric energy, relatively low production cost and higher energy
Amount transformation efficiency is always the target that solar cell industry is pursued.For current conventional solar cell, the contact of its positive electrode
Electrode and negative electrode contact electrode are located at the tow sides of cell piece respectively.The front of battery is smooth surface, front metal positive electricity
The covering of pole contact electrode will cause the sunshine of a part of incidence to be reflected by metal electrode, cause a part of optics to damage
Lose.The area coverage of the front metal electrode of common crystal silicon solar batteries reduces the front covering of metal electrode 7% or so
The energy conversion efficiency for the battery that can directly improve.
Full back contact solar cell be it is a kind of by positive electrode and negative electrode contact electrode be both placed in cell backside (it is non-by
Smooth surface) battery, the smooth surface of the battery is blocked without any metal electrode, so as to effectively increase the short circuit current flow of cell piece,
It is improved the energy conversion efficiency of cell piece.
The solar cell of full back contact structure is at present can energy in the crystal silicon solar batteries of industrialized mass production
A kind of battery of transformation efficiency highest, its high transformation efficiency, low component package cost is deep always to be favored by people.
In conventional full back contact solar cell manufacture craft, its metallization process is mostly using the complex plating of flow come real
Existing, this method is in the series resistance of reduction back contact battery, and improve the open-circuit voltage of battery has outstanding performance really, but should
Method complex process, the discarded object severe contamination environment of discharge, and with the main flow metal of current industrialized production solar cell
Change method is not compatible, therefore larger for the Industry Promotion difficulty of low cost.
If carrying out the metallization of back contact battery using conventional main gate line using the screen printing technique of current main flow
Two subject matters faced during design are：(1) between main gate line and the thin grid line of opposite electrode and main gate line and opposite electrode
Insulation between corresponding doped region；(2) because full back contact battery electric current is significantly higher than conventional batteries, in order to reduce main grid
The power attenuation that line resistance on line and thin grid line is caused needs to use wider grid line, and more slurry consumptions bring cost
Steeply rise.
One kind is solved between main gate line and the thin grid line of opposite electrode and main gate line and the corresponding doping of opposite electrode
The method of insulation between region is the corresponding region printing insulating barrier slurry of positive electrode main grid, only positive-electrode fine on silicon chip
Grid line and peripheral part p+ regions are not blocked.Likewise, printing insulating barrier slurry in the corresponding region of negative electrode main grid, only
The superfine grid line of negative electricity and peripheral part n+ regions are not blocked.Patent CN103762253A disclose this battery production method and
Structure.But the method for this printing insulation paste there must be enough thickness, otherwise it is easy to generation tip and punctures.In addition by
In cannot pass through high-temperature process after the printing of this insulation paste, existing sintering process is incompatible with its.More than shortcoming and
The expensive price of insulation paste causes the method for printing insulating barrier slurry not used on a large scale.
Another method is solved between main gate line and the thin grid line of opposite electrode and main gate line and opposite electrode is corresponding mixes
Insulation between miscellaneous region is that positive and negative electrode is designed using rich font, and the superfine grid line of negative electricity avoids positive electrode main gate line, positive electrode
Thin grid line avoids negative electrode main gate line.So the place of the X-Y scheme of positive and negative electrode not staggeredly, can solve reverse leakage
Problem.Patent US20110041908A1 discloses this battery production method and structure.But be the drawbacks of this method by
It is difficult to be collected by negative electrode in the corresponding electronics in relation positive electrode main grid position of lateral transport distance, negative electrode main grid position pair
The hole answered is difficult to be collected by positive electrode.In this way, causing the fill factor, curve factor and electricity conversion of battery to be a greater impact.
Utility model content
The purpose of this utility model is to provide one kind without the full back contact solar cell component of grid line, and the battery component was both
The reliability of full back contact battery component can be lifted can reduce its technology difficulty and manufacturing cost again.
Above-mentioned purpose of the present utility model is achieved through the following technical solutions：One kind is without the full back contacts sun of grid line
Energy battery component, includes the back contact solar baby battery piece of multiple phases series winding, the back contact solar baby battery piece is by carrying on the back
The cutting of contact solar cell piece is formed, and the back contact solar cell piece includes n-type silicon matrix, the n-type silicon matrix
The back side is provided with the p+ doped regions and n+ doped regions for being parallel to each other and being alternately arranged, the p+ doped regions and n+ doped regions
Backside passivation layer is provided with, the backside passivation layer is provided with positive electrode contact site and negative electrode contact site, and wherein positive electrode connects
Contact portion be located at the p+ doped regions correspondence position on and be in contact with the p+ doped regions, the negative electrode contact site in
It is in contact on the n+ doped regions correspondence position and with the n+ doped regions, the positive electrode contact site and the negative electrode
Covered with scolding tin or conducting resinl on contact site, the back contact solar cell piece edge is mixed perpendicular to the p+ doped regions and n+
The long side direction in miscellaneous region cuts into some back contact solar baby battery pieces, when adjacent two baby batteries piece is mutually contacted, it is described just
It is provided with copper cash, the scolding tin or conducting resinl of the negative electrode contact site and is also equipped with the scolding tin or conducting resinl of electrode contact
Copper cash, adjacent two baby batteries piece is directly mutually contacted by copper cash, or adjacent two baby batteries piece is mutually contacted by copper cash with welding.
In the utility model conventional full back contacts are thoroughly solved without the full back contact solar cell modular construction of grid line
The problem of being insulated between solar cell main gate line and matrix, it is to avoid using insulation paste ensure that component reliably and with long-term
Property；Grid line is not provided with battery to eliminate main gate line and the expensive silver paste cost of thin grid line；Simultaneously because cut
Multiple battery units, reduce the electric current of every a string of cell pieces group string, so as to reduce the influence of resistance loss on copper wire, therefore
Can be using the both positive and negative polarity contact point on thinner copper cash connection battery unit, it is ensured that the fill factor, curve factor of component.
, will be wherein one small when adjacent two baby batteries piece is mutually contacted as a kind of preferred embodiment in the utility model
Cell piece rotates 180 ° and obtains adjacent baby battery piece, wherein the pole of the electrode contact of a baby battery piece and adjacent baby battery piece
Property opposite electrode contact flush, directly using copper cash by a wherein baby battery piece when adjacent two baby batteries piece is mutually contacted
Scolding tin or conducting resinl on electrode contact and the welding or conduction on the opposite polarity electrode contact of adjacent baby battery piece
Glue is connected, and forms series winding cell piece.
When i.e. adjacent two cell piece is contacted, the back contact solar baby battery back side can upward be placed, adjacent solar energy
Baby battery rotates 180 ° and finely tunes cell piece in the position of copper cash or so so that the opposite electrode of adjacent cell piece aligns, most
It is on same straight line, then many copper wires stretched to be placed on scolding tin or conducting resinl, by way of heating well
So that copper cash is solidificated on scolding tin or conducting resinl to be connected with the electrode of battery.
As it is of the present utility model it is a kind of preferred embodiment, the parallel setting of many copper cash and can in the utility model
These baby battery pieces are cascaded by the both positive and negative polarity contact site for connecting adjacent two baby batteries piece simultaneously, then again by unnecessary copper
Ensure the circuit of these baby battery pieces formation series connection, a group string as solar cell module after line excision.
As another preferred embodiment in the utility model, when adjacent two baby batteries piece is mutually contacted, adjacent two is small
Battery chip architecture is identical (need not overturn 180 °), wherein the polarity of the electrode contact of a baby battery piece and adjacent baby battery piece
Copper cash on identical electrode contact flush, the positive electrode contact site and the copper cash two ends on the negative electrode contact site
Do not line up, respectively with jag and shortening end, the jag of the copper cash on adjacent two baby batteries piece be connected using welding,
Form series winding cell piece.
When i.e. adjacent two cell piece is contacted, structure identical back contact solar baby battery is disposed adjacent, without rotation,
But the copper cash on the copper cash and negative electrode contact site on positive electrode contact site is that arranged in parallel and two ends are not lined up, and is had respectively
There are jag and the copper cash shortened on end, adjacent two baby batteries piece also not to contact with each other, when adjacent two cell piece is mutually contacted, adopt
The jag of the copper cash on adjacent two baby batteries piece is connected with welding, series winding cell piece is formed.
Meanwhile, shortening end of the welding not with the copper cash on adjacent two baby batteries piece is in contact.
As one kind of the present utility model preferred embodiment, many copper cash are parallel in the utility model is set and same
When connect two adjacent solar energy baby battery pieces, then unnecessary copper cash will be cut off again, made positive and negative on same baby battery piece
Copper cash on electrode contact is arranged in parallel and two ends are not lined up, and has jag in both sides respectively and shortens end, by phase
When adjacent two cell pieces are mutually contacted, the jag of the copper cash on adjacent two baby batteries piece is connected (such as by baby battery using welding
Copper cash jag on the positive electrode contact site of piece is connected with the copper cash jag on the negative electrode contact site of adjacent cell piece
Or the copper cash jag on the negative electrode contact site of baby battery piece is dashed forward with the copper cash on the positive electrode contact site of adjacent cell piece
Go out end to be connected), form series winding cell piece.Meanwhile, shortening end of the welding not with the copper cash on adjacent two baby batteries piece is in contact.
By setting scolding tin or conducting resinl on positive and negative electrode contact site, and using copper cash or copper cash and welding connection scolding tin
Or conduction band glue, any main gate line and thin grid line can be not provided with back contact solar baby battery piece, all electric currents are all from just
Negative electrode contact site is pooled on copper cash by scolding tin or conducting resinl.
It is used as a kind of improvement of the present utility model：Copper cash on the scolding tin or conducting resinl of the positive electrode contact site with it is described
Copper cash on the scolding tin or conducting resinl of negative electrode contact site is parallel to be set, and the copper cash is along the p+ doped regions and institute
The long side direction for stating n+ doped regions is set.
So design, be easy to make copper cash with the doped region of neighboring area opposite polarity and on these doped regions
The electrode contact of opposite polarity keep at a distance, so as to avoid the generation of electric leakage.
Main gate line and thin grid line are substituted by copper cash to adulterate along p+ doped regions or n+ come collected current, and copper cash
The long side direction in region, it is to avoid conventional back contact battery main gate line crosses over brought when p+ doped regions and n+ doped regions exhausted
Edge hardly possible problem.
The utility model does not make special restriction for the shape of copper cash, but the section of the copper cash is preferably circular or ellipse
Circle, wherein the sectional area of single copper cash is preferably 100~9000 μm2。
The utility model is not made particularly to limit for the shape of positive and negative electrode contact site, but the positive electrode contact site
Shape can be preferably point-like or wire, and the area of wherein a single point or single hop line is preferably 100~9000 μm2, adjacent 2 points
Or the spacing between adjacent two sections of lines is preferably 30~2000 μm.
Scolding tin or conducting resinl described in the utility model all cover the positive electrode using silk-screen printing or mode for dispensing glue
Contact site and the negative electrode contact site, and partially or fully cover the p+ doped regions and n+ doped regions, the scolding tin
Or conducting resinl is shaped as strip, the size of the scolding tin or conducting resinl in p+ doped regions and n+ doped region short side directions
For 30~1500 μm, and less than the size of the p+ doped regions and n+ doped region short sides.
Back contact solar baby battery piece described in the utility model is formed by the cutting of back contact solar cell piece, after cutting
Back contact solar baby battery piece structure be similar to full back contact battery (IBC), difference is this back contacts sun
Energy baby battery piece does not have any grid line, only both positive and negative polarity contact site.Because scolding tin or conducting resinl on positive and negative electrode contact site
Size is more than the size of positive and negative electrode contact site, so can easily realize scolding tin or conducting resinl and copper cash contraposition and
Battery efficiency is not influenceed, does not also increase silver paste cost.
The material of scolding tin described in the utility model is preferably tin, leypewter, sn-bi alloy or tin-lead silver alloy, described to lead
Electric glue is preferably the conductive particle that binding agent includes, and the conductive particle is preferably silver, gold, copper or alloying metal particle, described
Binding agent is preferably epoxy resin, phenolic resin, polyurethane, thermoplastic resin or polyimides.
Back contact solar cell piece described in the utility model is preferably along perpendicular to the p+ doped regions and n+ doped regions
The long side direction in domain cuts into 2~20 back contact solar baby battery pieces.
So design causes the electric current of battery pack string to greatly reduce, so as to reduce the loss on copper wire.
N-type silicon matrix described in the utility model is preferably first handled using preceding through surface wool manufacturing, is then beaten using diffusion, laser
The technical combinations such as hole, ion implanting ＆ annealing, mask, etching make the p+ doped regions being arranged alternately with each other in silicon substrate back surface
Domain and n+ doped regions, and make the n+FSF of low surface dopant concentration in silicon substrate body front surface.
Front-surface field and antireflective passivation layer are additionally provided with the preceding surface of n-type silicon matrix described in the utility model.Antireflective
The material of passivation layer can be Al2O3/ SiNx, SiO2/ SiNx, SiO2/Al2O3/SiNxDeng further preferred SiO2/ SiNx conducts
Preceding surface antireflective passivation layer, its thickness is preferably 60~200nm.
It is that passivation layer carries out n+, P+ doped region subregion passivation or simultaneously blunt that backside deposition, which increases reflective stacks passivating film,
Change, overlayer passivation film can select Al2O3/SiNx、SiO2/SiNx、SiO2/SiCN、SiO2/SiON etc., further preferred SiO2/
Al2O3/ SiNx is as backside passivation film, and thickness is preferably 45~600nm.
After the completion of the preparation of every a string of battery packs string, it is follow-up conflux, lamination, module encapsulation techniques and the routine group such as lamination
Part production method is similar.
Compared with prior art, the utility model has the advantages that：
(1) sense of current is along the long side side of strip doped region on each battery pack string in the utility model
To different from the construction of the main gate line of conventional one parallel doped region short side direction of setting, so as to avoid full back contacts
Loss in efficiency or process complexity and the expensive silver paste cost for eliminating main gate line that battery setting main gate line is brought, nothing
The full back contact solar cell modular construction of grid line thoroughly solve conventional full back contact solar cell main gate line and matrix it
Between the problem of insulate, it is to avoid the long-term reliability of component is ensure that using insulation paste；
(2) thin grid line connection Spot electrodes are not provided with battery but Spot electrodes are directly connected to so as to again using copper cash
Eliminate the silver paste cost of thin grid line；
(3) simultaneously because cut multiple battery units, the electric current of every a string of cell pieces group string is reduced, so as to reduce
The influence of resistance loss on copper wire, therefore can be using the both positive and negative polarity contact point on thinner copper wire connection battery unit, it is ensured that
The fill factor, curve factor of component；
3 points based on more than, the utility model battery component can not only lift the efficiency of full back contact battery component but also significantly
Reduce its technology difficulty and manufacturing cost.
Brief description of the drawings
Fig. 1 is when not printing conducting resinl without the full back contact solar cell of grid line in embodiment 1-2 or half during scolding tin
Finished product structure schematic diagram；
Fig. 2 is the finished product structure schematic diagram without the full back contact solar cell of grid line in embodiment 1-2
Fig. 3 is without the structural representation after the full back contact solar cell laser cutting of grid line in embodiment 1-2；
Fig. 4 is the postrotational schematic diagram of baby battery piece without the full back contact solar cell cutting of grid line in embodiment 1-2；
Fig. 5 is the schematic diagram after being connected without the full back contact solar baby battery of grid line with copper cash in embodiment 1-2；
Fig. 6 is the battery pack string schematic diagram without the full back contact solar baby battery of grid line after cutting copper cash in embodiment 1；
Fig. 7 is small without the full back contact solar of grid line after after cutting copper cash in embodiment 2 and copper wire is connected with welding
The battery pack string schematic diagram of battery；
1 is n-type silicon matrix, and 2 be front-surface field n+FSF, and 3 be p+ doped regions, and 4 be n+ doped regions, and 5 be front passivation
Layer, 6 be backside passivation layer, and 7 be positive electrode contact site, and 8 be negative electrode contact site, 9 conducting resinl or weldering for positive electrode contact site
Tin, 10 be the conducting resinl or scolding tin of negative electrode contact site, and 11 be copper cash, and 12 be welding.
Embodiment
Embodiment 1
As shown in figures 1 to 6, what the present embodiment was provided contacts without the full back contact solar cell component of main grid, including multiple phases
Back contact solar baby battery piece, back contact solar baby battery piece by back contact solar cell piece cutting form, the back of the body connects
Touching solar battery sheet includes n-type silicon matrix 1, and the back side of n-type silicon matrix is provided with the p+ doped regions for being parallel to each other and being alternately arranged
Domain 3 and n+ doped regions 4, p+ doped regions 3 and n+ doped regions 4 are provided with backside passivation layer 6, and backside passivation layer 6 is provided with
Positive electrode contact site 7 and negative electrode contact site 8, wherein positive electrode contact site 7 are located on the correspondence position of p+ doped regions 3 and and p+
Doped region 3 is in contact, and negative electrode contact site 8 is located on the correspondence position of n+ doped regions 4 and is in contact with n+ doped regions 4,
Covered with conducting resinl on positive electrode contact site 7 and negative electrode contact site 8, back contact solar cell piece is along perpendicular to p+ doped regions
Domain 3 and the direction of n+ doped regions 4 cut into some back contact solar baby battery pieces, when adjacent two baby batteries piece is mutually contacted,
It is provided with the conducting resinl 9 of positive electrode contact site 7 on copper cash 11, the conducting resinl 10 of negative electrode contact site 8 and is also equipped with copper cash 11,
Adjacent two baby batteries piece is directly mutually contacted by copper cash 11, or adjacent two baby batteries piece is mutually contacted by copper cash 11 with welding 12.
As seen in figs. 5-6, when adjacent two baby batteries piece is mutually contacted, a wherein baby battery piece is rotated into 180 ° of acquisitions adjacent
Baby battery piece, wherein the electrode contact of a baby battery piece is equal with the opposite polarity electrode contact of adjacent baby battery piece
Together, when adjacent two baby batteries piece is mutually contacted directly using copper cash by the conducting resinl on the wherein electrode contact of a baby battery piece with
Conducting resinl on the opposite polarity electrode contact of adjacent baby battery piece is connected, and forms series winding cell piece.
And the copper cash 11 on the conducting resinl 9 of positive electrode contact site 7 and the copper cash on the conducting resinl 10 of negative electrode contact site 8
11 parallel settings, and long side direction setting of the copper cash 11 along p+ doped regions 3 and n+ doped regions 4.
The section of copper cash is circle, and its sectional area is 100~9000 μm2。
Positive electrode contact site is shaped as point-like, and wherein the area of a single point is 100~9000 μm2, it is adjacent between 2 points
Spacing be 30~2000 μm.
Conducting resinl all covering positive electrode contact site and negative electrode contact site, and local complexity by the way of silk-screen printing
P+ doped regions and n+ doped regions, conducting resinl are shaped as strip, and conducting resinl is short in p+ doped regions and n+ doped regions
The size of edge direction is 30~1500 μm, and less than the size of p+ doped regions and n+ doped region short sides.
Conducting resinl is the conductive particle that binding agent includes, and conductive particle is silver, and binding agent is epoxide resin conductive adhesive.
Back contact solar cell piece edge cuts into 2 back contacts perpendicular to the direction of p+ doped regions and n+ doped regions
Solar energy baby battery piece.The structure of this 2 back contact solar baby batteries is identical with size.As shown in Figure 3.
When adjacent two baby batteries piece is mutually contacted, a wherein baby battery piece is rotated 180 ° and obtains adjacent baby battery piece, such as
Shown in Fig. 4, wherein the opposite polarity electrode contact flush of the electrode contact of a baby battery piece and adjacent baby battery piece,
Copper cash is directly used when adjacent two baby batteries piece is mutually contacted by the conducting resinl and phase on the wherein electrode contact of a baby battery piece
Conducting resinl on the opposite polarity electrode contact of adjacent baby battery piece is connected, and forms series winding cell piece.As shown in Figure 5.
Copper cash is first arranged in the present embodiment, and first baby battery piece is aligned with it, second baby battery piece rotation
It is aligned after 180 ° with copper cash, it is ensured that and first baby battery piece formation series connection, baby battery piece below is successively by this rule row
Row, form a battery pack string.The circuit of these baby battery pieces formation series connection will be ensured after unnecessary copper wire excision again, turned into
Long side direction of the electric current along strip n+ or p+ doped region on one group string of solar cell module, cell piece is led
Go out.
Main gate line and thin grid line are substituted come collected current by copper cash in the present embodiment, and copper cash is along doped region
Long side direction, it is to avoid conventional back contact battery main gate line crosses over the difficult problem of the insulation brought during n+ and p+ doped regions.And
Because battery cuts into fritter, electric current is reduced, conducting resinl size is larger to be allowed to using thinner copper wire connection battery list
Conducting resinl in member, it is ensured that the fill factor, curve factor of component.
As shown in Figure 1-2, the n-type silicon matrix 1 of back contact solar cell piece is first handled before through surface wool manufacturing, then
Made and alternateed in silicon substrate back surface using technical combinations such as diffusion, laser boring, ion implanting ＆ annealing, mask, etchings
The p+ doped regions 3 and n+ doped regions 4 of arrangement, and make the front-surface field n+ of low surface dopant concentration in silicon substrate body front surface
FSF 2。
Also deposition has antireflective overlayer passivation film to be passivated n+FSF5, such as Al on the preceding surface of the utility model2O3/ SiNx,
SiO2/ SiNx, SiO2/Al2O3/SiNxDeng further preferred SiO2/ SiNx is as front passivating film, and thickness is 60~200nm.
Backside deposition increases reflective stacks passivating film passivation layer 6 and carries out n+, P+ doped region subregion passivation or simultaneously blunt
Change, overlayer passivation film can select Al2O3/SiNx、SiO2/SiNx、SiO2/SiCN、SiO2/SiON etc., further preferred SiO2/
Al2O3/ SiNx is as backside passivation film, and thickness is preferably 45~600nm.
After the completion of the preparation of every a string of batteries, it is follow-up conflux, lamination, module encapsulation techniques and the general components system such as lamination
Make mode similar.
The above-mentioned preparation method without the full back contact solar cell component of main grid is as follows：
(1) from n-type single crystal silicon substrate 1, its resistivity is 1~30 Ω cm, and thickness is 50~300 μm, the silicon substrate
First handled using preceding through surface wool manufacturing, then utilize the technology groups such as diffusion, laser boring, ion implanting ＆ annealing, mask, etching
The p+ doped regions 3 and n+ doped regions 4 being arranged alternately with each other in the making of silicon substrate back surface are closed, is made in silicon substrate body front surface
The n+FSF 2 of low surface dopant concentration.
(2) preceding surface deposition antireflective overlayer passivation film 5 is passivated n+FSF, such as Al2O3/ SiNx, SiO2/ SiNx, SiO2/
Al2O3/ SiNx etc., selects SiO here2/ SiNx is as front passivating film, and thickness is 60~200nm, and it is folded that rear surface deposition increases reflection
Layer passivating film 6 is carried out n+ doped regions, P+ doped regions subregion passivation or is passivated simultaneously, and overlayer passivation film can be selected
Al2O3/SiNx、SiO2/SiNx、SiO2/SiCN、SiO2/ SiON etc., selects SiO here2/Al2O3/ SiNx as backside passivation film,
Thickness is 45~600nm.
(3) positive electrode contact point 7 is made on p+ doped regions 3, negative electrode contact point 8 is made on n+ doped regions 4,
Contact point can directly be burnt using printing silver paste can also be republished using first laser opening by the way of backside passivation film or
The mode of metal is electroplated, so as to form the Ohmic contact of contact point and silicon substrate, contact point shape is not limited, single contact point
Area is 100 μm2~90000 μm2。
(4) annealing or sinter causes contact point and silicon substrate to form good Ohmic contact, in n+ doped regions and p+
Doped region surface printing conducting resinl connection electrode contact point is used to export in electric current, and conducting resinl is in doped region short side direction
Length is 20~1500 μm and is less than the length of doped region short side to ensure between conducting resinl and adjacent doped areas matrix
Insulating properties.
(5) above-mentioned back contact solar cell piece is cut, the back contact solar of said structure is formed after cutting
Baby battery piece.
(6) when adjacent two back contact solars baby battery piece is in series, one is connected to using many copper wires being parallel to each other
Conducting resinl on the electrode of back contact solar baby battery piece is while these copper wires are connected to the pole of adjacent solar energy baby battery piece
Long side direction of the electric current along strip n+ or p+ doped region on conducting resinl on the opposite electrode of property, cell piece is led
Go out.Ensure that the electrode on each strip n+ and p+ doped regions on baby battery piece passes through conducting resinl when copper wire is connected up
It is connected with a copper wire.The back contact solar baby battery back side can upward be placed in series welding, adjacent solar energy baby battery
Rotation 180 ° and finely tune cell piece in the position of copper cash or so so that the opposite electrode of adjacent cell piece point-blank, so
The many copper wires stretched are placed on scolding tin or conducting resinl afterwards, caused by way of heating copper cash be solidificated in scolding tin or
So as to be connected with the electrode of battery on conducting resinl.It will ensure that these baby battery pieces are formed after unnecessary copper wire line segment excision again
The circuit of series connection, a group string as solar cell module, each group string includes 6~200 solar energy baby batteries.
(7) after the completion of prepared by every a string of batteries, it is follow-up conflux, lamination, module encapsulation techniques and the general components such as lamination
Production method is similar.
Embodiment 2
As shown in fig. 7, as different from Example 1：When adjacent two baby batteries piece is mutually contacted, adjacent two baby batteries chip architecture
Identical (need not overturn 180 °), wherein the polarity identical electrode of the electrode contact of a baby battery piece and adjacent baby battery piece
Copper cash on contact site flush, positive electrode contact site is not lined up with the copper cash two ends on negative electrode contact site, respectively with prominent
Go out end and shorten end, the jag of the copper cash on adjacent two baby batteries piece is connected using welding, form series winding cell piece.And
Shortening end of the welding not with the copper cash on adjacent two baby batteries piece is in contact.
Jag phase i.e. using welding with being connected to the wherein copper wire of the negative electrode of a back contact solar baby battery piece
Welding, while the jag of the copper wire of positive electrode of this welding with being connected to adjacent back contact solar baby battery piece is mutually welded.
The width of welding is 0.2~2mm, and length is close with baby battery leaf length.
So it is easier to test battery efficiency compared to embodiment 1, probe is contacted into the welding that both positive and negative polarity is connected.
Although the utility model is disclosed as above with embodiment, it is not limited to protection model of the present utility model
Enclose, the material of such as conductive tape or scolding tin can also be the other materials that utility model content part is enumerated, be only to arrange herein
Lift, and be not construed as limiting, the graphic structure of point contact can also carry out exchange adjustment, for example, p+ doped regions and n+ can be adulterated
The position in region is exchanged, while adjustment positive electrode contact site and the position of negative electrode contact site of adaptability, can also connect the back of the body
Tactile solar battery sheet is cut into more than 2, preferably 2~20, any to be familiar with those skilled in the art, is not departing from this
The change and retouching made in the spirit and scope of utility model, all should belong to protection domain of the present utility model.
Claims (10)
1. a kind of include the back contact solar baby battery piece of multiple phases series winding without the full back contact solar cell component of grid line,
The back contact solar baby battery piece is formed by the cutting of back contact solar cell piece, the back contact solar cell piece bag
N-type silicon matrix is included, the back side of the n-type silicon matrix is provided with the p+ doped regions and n+ doped regions that are parallel to each other and are alternately arranged
Domain, the p+ doped regions and n+ doped regions are provided with backside passivation layer, and the backside passivation layer is contacted provided with positive electrode
Portion and negative electrode contact site, wherein positive electrode contact site on the p+ doped regions correspondence position and with the p+ doped regions
Domain is in contact, and the negative electrode contact site connects on the n+ doped regions correspondence position and with the n+ doped regions
Touch, it is characterized in that：Covered with scolding tin or conducting resinl, the back contacts on the positive electrode contact site and the negative electrode contact site
Solar battery sheet cuts into some back contacts sun along the long side direction perpendicular to the p+ doped regions and n+ doped regions
Energy baby battery piece, when adjacent two baby batteries piece is mutually contacted, copper cash is provided with the scolding tin or conducting resinl of the positive electrode contact site,
Copper cash is also equipped with the scolding tin or conducting resinl of the negative electrode contact site, adjacent two baby batteries piece is directly mutually gone here and there by copper cash
Connect, or adjacent two baby batteries piece is mutually contacted by copper cash with welding.
2. it is according to claim 1 without the full back contact solar cell component of grid line, it is characterized in that：Adjacent two baby batteries piece
When mutually contacting, a wherein baby battery piece is rotated into 180o and obtains adjacent baby battery piece, wherein the electrode contact of a baby battery piece
Portion and the opposite polarity electrode contact flush of adjacent baby battery piece, adjacent two baby batteries piece directly use copper when mutually contacting
Line is by the opposite polarity electrode of the scolding tin or conducting resinl on the wherein electrode contact of a baby battery piece and adjacent baby battery piece
Welding or conducting resinl on contact site are connected, and form series winding cell piece.
3. it is according to claim 1 without the full back contact solar cell component of grid line, it is characterized in that：Adjacent two baby batteries piece
When mutually contacting, adjacent two baby batteries chip architecture is identical, wherein the pole of the electrode contact of a baby battery piece and adjacent baby battery piece
Property identical electrode contact flush, the copper cash on the positive electrode contact site and the copper cash two on the negative electrode contact site
End is not lined up, and respectively with jag and shortening end, the copper cash jag on adjacent two baby batteries piece is connected using welding,
Form series winding cell piece.
4. according to claim any one of 1-3 without the full back contact solar cell component of grid line, it is characterized in that：It is described just
Copper cash on the scolding tin or conducting resinl of electrode contact is equal with the copper cash on the scolding tin or conducting resinl of the negative electrode contact site
Row is set, and long side direction of the copper cash along the p+ doped regions and the n+ doped regions is set.
5. it is according to claim 4 without the full back contact solar cell component of grid line, it is characterized in that：The section of the copper cash
For circular or ellipse, its sectional area is 100 ~ 9000 μm2。
6. it is according to claim 4 without the full back contact solar cell component of grid line, it is characterized in that：The positive electrode contact
Portion is shaped as point-like or wire, and the wherein area of a single point or single hop line is 100 ~ 9000 μm2, adjacent 2 points or adjacent two sections
Spacing between line is 30 ~ 2000 μm.
7. it is according to claim 4 without the full back contact solar cell component of grid line, it is characterized in that：The scolding tin or conduction
Glue all covers the positive electrode contact site and the negative electrode contact site using silk-screen printing or mode for dispensing glue, and it is local or
All the covering p+ doped regions and n+ doped regions, the scolding tin or conducting resinl are shaped as strip, the scolding tin or
Conducting resinl is 30 ~ 1500 μm in the short side dimension of p+ doped regions and n+ doped regions, and less than the p+ doped regions and n+
The size of doped region short side.
8. it is according to claim 7 without the full back contact solar cell component of grid line, it is characterized in that：The material of the scolding tin
For tin, leypewter, sn-bi alloy or tin-lead silver alloy, the conducting resinl is the conductive particle that binding agent includes, the conduction
Particle is silver-colored, gold, copper or alloying metal particle, and the binding agent is epoxy resin, phenolic resin, polyurethane, thermoplastic resin
Or polyimides.
9. it is according to claim 4 without the full back contact solar cell component of grid line, it is characterized in that：The back contacts sun
Energy cell piece cuts into 2 ~ 20 back contact solars along the long side direction perpendicular to the p+ doped regions and n+ doped regions
Baby battery piece.
10. it is according to claim 4 without the full back contact solar cell component of grid line, it is characterized in that：The n-type silicon matrix
Preceding surface on be additionally provided with front-surface field and antireflective passivation layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720081323.7U CN206558521U (en) | 2017-01-22 | 2017-01-22 | One kind is without the full back contact solar cell component of grid line |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720081323.7U CN206558521U (en) | 2017-01-22 | 2017-01-22 | One kind is without the full back contact solar cell component of grid line |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206558521U true CN206558521U (en) | 2017-10-13 |
Family
ID=60009814
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720081323.7U Withdrawn - After Issue CN206558521U (en) | 2017-01-22 | 2017-01-22 | One kind is without the full back contact solar cell component of grid line |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653912A (en) * | 2017-01-22 | 2017-05-10 | 晶澳（扬州）太阳能科技有限公司 | Grid line-free full-back contact solar cell module |
| CN109347437A (en) * | 2018-09-17 | 2019-02-15 | 江西展宇新能源股份有限公司 | A kind of more main grid test equipment of solar cells |
| CN109698252A (en) * | 2018-12-25 | 2019-04-30 | 浙江晶科能源有限公司 | A kind of IBC battery and preparation method thereof |
| CN109713074A (en) * | 2018-12-27 | 2019-05-03 | 浙江晶科能源有限公司 | A kind of battery strings based on IBC battery |
| CN112768544A (en) * | 2020-12-31 | 2021-05-07 | 锦州阳光能源有限公司 | IBC photovoltaic cell assembly and welding process thereof |
-
2017
- 2017-01-22 CN CN201720081323.7U patent/CN206558521U/en not_active Withdrawn - After Issue
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106653912A (en) * | 2017-01-22 | 2017-05-10 | 晶澳（扬州）太阳能科技有限公司 | Grid line-free full-back contact solar cell module |
| CN106653912B (en) * | 2017-01-22 | 2023-10-24 | 晶澳（扬州）太阳能科技有限公司 | Grid-line-free full back contact solar cell module |
| CN109347437A (en) * | 2018-09-17 | 2019-02-15 | 江西展宇新能源股份有限公司 | A kind of more main grid test equipment of solar cells |
| CN109698252A (en) * | 2018-12-25 | 2019-04-30 | 浙江晶科能源有限公司 | A kind of IBC battery and preparation method thereof |
| CN109713074A (en) * | 2018-12-27 | 2019-05-03 | 浙江晶科能源有限公司 | A kind of battery strings based on IBC battery |
| CN112768544A (en) * | 2020-12-31 | 2021-05-07 | 锦州阳光能源有限公司 | IBC photovoltaic cell assembly and welding process thereof |
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