CN109904268A - Back contacts solar module and its manufacturing method - Google Patents
Back contacts solar module and its manufacturing method Download PDFInfo
- Publication number
- CN109904268A CN109904268A CN201910146681.5A CN201910146681A CN109904268A CN 109904268 A CN109904268 A CN 109904268A CN 201910146681 A CN201910146681 A CN 201910146681A CN 109904268 A CN109904268 A CN 109904268A
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- Prior art keywords
- back contacts
- contacts solar
- solar cell
- metal foil
- conductive metal
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- 239000011888 foil Substances 0.000 claims abstract description 119
- 229910052751 metal Inorganic materials 0.000 claims abstract description 116
- 239000002184 metal Substances 0.000 claims abstract description 116
- 239000010410 layer Substances 0.000 claims abstract description 98
- 241000446313 Lamella Species 0.000 claims abstract description 46
- 239000012790 adhesive layer Substances 0.000 claims abstract description 30
- 229920000642 polymer Polymers 0.000 claims abstract description 16
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- 230000005540 biological transmission Effects 0.000 claims description 9
- 239000011148 porous material Substances 0.000 claims description 6
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 6
- 229910052710 silicon Inorganic materials 0.000 description 6
- 239000010703 silicon Substances 0.000 description 6
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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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
This application discloses a kind of back contacts solar module and its manufacturing methods, including battery lamella, the back side of battery lamella is fixedly connected with insulating layer, insulating layer is fixedly connected with several conductive metal foil circuits backwards to the side of battery lamella, gap is provided between adjacent conductive metal foil circuit, battery lamella is provided with several back contacts solar cell pieces, the anode and cathode of any back contacts solar cell piece pass through electric connector respectively and are electrically connected with disjunct conductive metal foil circuit, conductive metal foil circuit is bonded with polymer backboard by adhesive layer backwards to the side of battery lamella, the anode and cathode of back contacts solar cell piece are drawn by electric connector, conductive metal foil circuit is realized in series or in parallel between each back contacts solar cell piece, it is packaged by being laminated, it can reduce the possibility of cell piece bending arculae Property, fragment rate is reduced, being able to solve existing welding connection cell piece will lead to the high problem of cell piece bending arculae, fragment rate.
Description
Technical field
The present invention relates generally to photovoltaic arts, and in particular to solar cell field more particularly to a kind of back contacts sun electricity
Pond component and its manufacturing method.
Background technique
Back contacts solar cell (such as IBC, MWT, EWT solar cell) is got the attention, since its front is not led
Grid line, even without any electrode pattern, positive and cathode is all located at the back side of cell piece, reduces the shading of cell piece, mention
The high transfer efficiency of cell piece.Back contact battery piece, which is made, in silicon wafer can further promote the transfer efficiency of cell piece and defeated
Power out.
Conventional batteries connect cell piece by the way of traditional welding welding, and stress caused by double-sided symmetrical welds can be with
It cancels each other out.But back contacts solar cell due to anode and cathode overleaf, can not when making back contact battery component
The connection between cell piece is carried out using traditional welding welding manner, will lead to battery using the stress that single-sided welding generates after cooling
Piece is bent arculae, and fragment rate is very high, and welding stress is not reduced not only, however it obviously increases.
Summary of the invention
In view of drawbacks described above in the prior art or deficiency, it is intended to provide a kind of back contacts solar cell for reducing fragment rate
Component and its manufacturing method.
In a first aspect, back contacts solar module of the invention, including battery lamella, the back side of battery lamella is fixed to be connected
It is connected to insulating layer, insulating layer is fixedly connected with several conductive metal foil circuits, adjacent conductive gold backwards to the side of battery lamella
Belong to and be provided with gap between foil circuit, battery lamella is provided with several back contacts solar cell pieces, any back contacts solar cell
The anode and cathode of piece pass through electric connector respectively and are electrically connected with disjunct conductive metal foil circuit, conductive metal foil circuit back
Polymer backboard is bonded with by adhesive layer to the side of battery lamella.
Second aspect, the manufacturing method of back contacts solar module of the invention, comprising the following steps:
Conductive metal foil, adhesive layer and polymer backboard are successively bonded；
Patterned process is carried out to conductive metal foil, forms conductive metal foil circuit；
Insulating layer is formed backwards to the side of adhesive layer in conductive metal foil circuit, insulating layer has been positioned apart from several open
Mouthful；
Electric connector is passed through into opening, so that electric connector is electrically connected with conductive metal foil circuit；
Several back contacts solar cell pieces are laid with backwards to the side of conductive metal foil circuit in insulating layer, form cell piece
Layer, the anode and cathode of any back contacts solar cell piece pass through electric connector and disjunct conductive metal foil circuit electricity respectively
Connection；
Encapsulated layer and front shroud before battery lamella is successively laid with backwards to the side of insulating layer；
Polymer backboard, adhesive layer, conductive metal foil circuit, insulating layer, preceding encapsulated layer and front shroud are laminated, obtained
To back contacts solar module.
According to technical solution provided by the embodiments of the present application, by electric connector by the anode of back contacts solar cell piece and
Cathode is drawn, and insulating layer can prevent from contacting with each other or generating short circuit, electric connector and conductive metal between each electric connector
The electrical connection of foil circuit, conductive metal foil circuit is realized in series or in parallel between each back contacts solar cell piece, passes through lamination
A possibility that being packaged, can reduce cell piece bending arculae, reduces fragment rate, is able to solve existing welding connection
Cell piece will lead to the high problem of cell piece bending arculae, fragment rate.
Detailed description of the invention
By reading a detailed description of non-restrictive embodiments in the light of the attached drawings below, the application's is other
Feature, objects and advantages will become more apparent upon:
Fig. 1 is the arrangement signal of the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention
Figure；
Fig. 2 is the arrangement signal of the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention
Figure；
Fig. 3 is the arrangement signal of the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention
Figure；
Fig. 4 is the structural schematic diagram of the back contacts solar module of the embodiment of the present invention；
Fig. 5 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is MWT battery
Structural schematic diagram；
Fig. 6 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is positive six side of full wafer
The structural schematic diagram of shape back contacts solar cell piece；
Fig. 7 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is half piece
The structural schematic diagram of regular hexagon back contacts solar cell piece；
Fig. 8 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is half piece
The structural schematic diagram of regular hexagon back contacts solar cell piece；
Fig. 9 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is one third piece
The structural schematic diagram of regular hexagon back contacts solar cell piece；
Figure 10 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is one third
The structural schematic diagram of piece regular hexagon back contacts solar cell piece；
Figure 11 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is a quarter
The structural schematic diagram of piece regular hexagon back contacts solar cell piece；
Figure 12 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is 1/6th
The structural schematic diagram of piece regular hexagon back contacts solar cell piece；
Figure 13 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is 1/6th
The structural schematic diagram of piece regular hexagon back contacts solar cell piece；
Figure 14 is that the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention is 1/6th
The structural schematic diagram of piece regular hexagon back contacts solar cell piece；
Figure 15 be the back contacts solar cell piece of the back contacts solar module of the embodiment of the present invention be 12/
The structural schematic diagram of a piece of regular hexagon back contacts solar cell piece.
Specific embodiment
The application is described in further detail with reference to the accompanying drawings and examples.It is understood that this place is retouched
The specific embodiment stated is used only for explaining related invention, rather than the restriction to the invention.It also should be noted that in order to
Convenient for description, part relevant to invention is illustrated only in attached drawing.
It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase
Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.
One of embodiment of the invention is, referring to FIG. 4, back contacts solar module of the invention, including electricity
Pond lamella 30, the back side of battery lamella 30 are fixedly connected with insulating layer 40, and insulating layer 40 is fixed backwards to the side of battery lamella 30
Several conductive metal foil circuits 50 are connected with, gap is provided between adjacent conductive metal foil circuit 50, battery lamella 30 is set
Several back contacts solar cell pieces 31 are equipped with, the anode and cathode of any back contacts solar cell piece 31 pass through electric connector respectively
41 are electrically connected with disjunct conductive metal foil circuit 50, and conductive metal foil circuit 50 passes through viscous backwards to the side of battery lamella 30
It connects layer 60 and is bonded with polymer backboard 70.
In an embodiment of the present invention, the back side of battery lamella is fixedly connected with insulating layer, in this application, battery lamella
Front refer to that the light-receiving surface of solar cell, light-receiving surface refer to the one side of the solar cell face sun, the back side of battery lamella
Refer to that the shady face of solar cell, shady face refer to that solar cell back to the one side of the sun, is fixed at the back side of battery lamella
Insulating layer is connected, can be avoided insulating layer influences battery lamella progress daylighting, ensure that the photoelectric conversion effect of solar module
Rate.
Insulating layer is fixedly connected with several conductive metal foil circuits backwards to the side of battery lamella, and conductive metal foil circuit is logical
Electric connector is crossed to be electrically connected with the realization of the electrode of battery lamella.To need two of concatenated two pieces of back contacts solar cell pieces not
Same electrode is electrically connected with the same conductive metal foil circuit, specifically, by the anode of one of back contacts solar cell piece
And the cathode of another piece of back contacts solar cell piece is electrically connected with the same conductive metal foil circuit, by one of back contacts
The anode of the cathode of solar cell piece and another piece of back contacts solar cell piece is electrically connected with the same conductive metal foil circuit.
Two identical electrodes of two pieces of back contacts solar cell pieces in parallel will be needed to be electrically connected with the same conductive metal foil circuit,
Specifically, by positive and another piece of back contacts solar cell piece of one of back contacts solar cell piece anode with it is same
A conductive metal foil circuit electrical connection, by the cathode of one of back contacts solar cell piece and another block of back contacts sun electricity
The cathode of pond piece is electrically connected with the same conductive metal foil circuit.Anode and the cathode difference of same back contacts solar cell piece
It is electrically connected disjunct conductive metal foil circuit, and is provided with gap between adjacent conductive metal foil circuit, is avoided
Solar cell piece short circuit.It does not need to connect back contacts solar cell piece by way of welding welds, avoids the back contacts sun
There is bending arculae in cell piece, reduces the fragment rate of solar cell piece.
The electrode of solar cell piece is drawn by electric connector, sun electricity is then realized by conductive metal foil circuit
Pond piece it is in series or in parallel, avoid back contacts solar cell piece from generating short circuit, insulating layer can prevent adjacent electric connector
Electrical connection, improves the incident photon-to-electron conversion efficiency of solar cell piece, improves the reliability of back contacts solar module.
Conductive metal foil circuit is bonded with polymer backboard by adhesive layer backwards to the side of battery lamella, passes through adhesive layer
Conductive metal foil circuit and polymer backboard are adhesively fixed, convenient for being fixed and patterning to conductive metal foil
Processing forms conductive metal foil circuit, improves processing efficiency and processing accuracy.
Back contacts solar cell piece can be with but not just for IBC solar cell, MWT solar cell, EWT solar cell.Back
The light-receiving surface of contact solar cell piece, which can be electrodeless structure, (has main grid structure and back using IBC battery structure, including the back side
Face dereliction grid structure), it is also possible to thin gate electrode structure (using MWT battery structure).Back contacts solar cell piece uses N-type silicon
Substrate or P-type silicon substrate.
The material of polymer backboard can be with but not just for TPT, TPE, KPE, KPK, KPC or KPF.Polymer backboard can also
It is made of totally new kind of material, it may include the several layers and adhesive layer that are made of insulating materials (such as PET or PP) contain
The polymeric multilayer structure that fluoropolymer coating is combined, thickness and cost can be greatly reduced, and be electrically insulated it is excellent,
Weatherability can also be guaranteed.
The material of conductive metal foil circuit is copper, silver, aluminium, nickel, magnesium, iron, titanium, molybdenum, any one in tungsten or a variety of
Combination, the material of conductive metal foil circuit be copper, silver, aluminium, nickel, magnesium, iron, titanium, molybdenum, any one in tungsten alloy or a variety of
The alloy of formation.
Electric connector is conductor, and the material of electric connector can be with but not just for electrocondution slurry, solder, soldering paste, conductive ink
Water, isotropic conductive adhesive, anisotropy conductiving glue, bulk or cylindrical metal, bulk or cylindrical metal alloy.Electrical connection
Body can be formed by silk-screen printing or mode for dispensing glue, and the material of electric connector can be with but not just for soldering paste or with sheet
Silver powder is conductive fill phase, the conducting resinl based on epoxy resin and/or acrylic resin.
Further, battery lamella 30 is fixedly connected with preceding encapsulated layer 20, preceding encapsulated layer 20 backwards to the side of insulating layer 40
Front shroud 10 is fixedly connected with backwards to the side of battery lamella 30.
In an embodiment of the present invention, the material of preceding encapsulated layer can (ethene-vinyl acetate be copolymerized with but not just for EVA
Object), PVB (polyvinyl butyral), POE (thermoplasticity and/or thermosetting polyolefin) or Ionomer (polyethylene-acetic acid esters
Ionomer).The material of preceding encapsulated layer is EVA, carries out encapsulated layer before obtaining under the conditions of 147 DEG C lamination 10 minutes.Front cover
Plate can with but not just for embossing tempered glass, the thickness 3.2mm of front shroud.
Further, insulating layer 40 has been positioned apart from several openings 42, and electric connector 41 passes through opening 42.
In an embodiment of the present invention, insulating layer has been positioned apart from several openings, and electric connector passes through opening, Neng Goubao
Card electric connector is electrically connected with the electrode of conductive metal foil circuit and back contacts solar cell piece respectively, and insulating layer is avoided to hinder
Electric connector is electrically connected with the electrode of conductive metal foil circuit and back contacts solar cell piece respectively, improves the back contacts sun
The yields of battery component.Meanwhile it also can reduce the difficulty of processing of back contacts solar module.
Further, 42 shape of being open is round or rectangular.
In an embodiment of the present invention, the shape of opening is round perhaps rectangular easy to process or forms opening, is reduced
The difficulty of processing of back contacts solar module improves the processing efficiency of back contacts solar module.
Further, 42 quantity of opening are 100-50000 or 5000-2000000 or 100-10000.
In an embodiment of the present invention, when back contacts solar cell piece is that the back side has main grid IBC battery, open amount is
100-50000；When back contacts solar cell piece be the back side without main grid IBC battery when, open amount is 5000-2000000；
When back contacts solar cell piece is MWT battery, open amount is 100-10000.
Further, thickness≤500 micron of insulating layer 40, the thickness G T.GT.GT 0 of insulating layer, adhesive layer with a thickness of 10-500
Micron.
In an embodiment of the present invention, adhesive layer can be with but not just for EVA adhesive film, POE glue film or PVB film, adhesive layer
With a thickness of 10-500 microns.Thickness≤500 micron of insulating layer, the thickness G T.GT.GT 0 of insulating layer, insulating layer become with certain heat resistanceheat resistant
Shape ability so that insulating layer deformed in lamination process it is smaller, convenient for back contacts solar cell piece electrode and electric connector pair
Standard improves the processing accuracy of back contacts solar module, improves yields.Meanwhile it also can be avoided insulating layer mistake
Thickness reduces manufacturing cost.
Further, insulating layer 40 with a thickness of 50-200 microns.
In an embodiment of the present invention, insulating layer with a thickness of 50-200 microns, insulating layer has certain thermal deformation resistant energy
Power, so that insulating layer deforms smaller in lamination process, the electrode convenient for back contacts solar cell piece is aligned with electric connector, is mentioned
The high processing accuracy of back contacts solar modules, improves yields.Meanwhile it is blocked up also to can be avoided insulating layer, drop
Low manufacturing cost.
Further, the material of conductive metal foil circuit 50 is copper foil or aluminium foil, the thickness of conductive metal foil circuit 50
It is 10-100 microns.
In an embodiment of the present invention, the material of conductive metal foil circuit is copper foil or aluminium foil, conductive metal foil circuit
With a thickness of 10-100 microns, conductive metal foil circuit is capable of providing low-resistance current path, and ensure that conductive metal
Foil circuit will not be too thick, under the premise of ensure that the electric conductivity of conductive metal foil circuit, avoids back contacts solar panel
The manufacturing cost of part is excessively high.
Further, conductive metal foil circuit 50 with a thickness of 10-500 microns.
In an embodiment of the present invention, conductive metal foil circuit with a thickness of 10-500 microns, conductive metal foil circuit energy
Low-resistance current path is enough provided, and ensure that conductive metal foil circuit will not be too thick, ensure that conductive metal foil electricity
Under the premise of the electric conductivity on road, avoid the manufacturing cost of back contacts solar module excessively high.
Further, the conductive metal foil circuit 50 positioned at 30 edge of battery lamella exposes 30 edge of battery lamella.
In an embodiment of the present invention, when the light-receiving area of each back contacts solar cell piece is identical, it is only necessary to by each back
Contact solar cell piece is connected, and is not needed so that conductive metal foil circuit exposes battery lamella edge.When each back contacts too
When the light-receiving area difference of positive cell piece, in order to avoid wooden pail effect, need the back contacts solar cell piece by small area advanced
Row is in parallel, then connects with the back contacts solar cell piece of large area, can will be located at the conductive metal foil circuit at battery layers edge
Expose battery lamella edge, conductive metal foil circuit exposes the part at battery lamella edge for designing connection circuit, convenient for small
Circuit connection is carried out between the back contacts solar cell piece of area, improves the processing efficiency of back contacts solar module.
Further, back contacts solar cell piece 31 is provided with just superfine grid line, the thin grid line of cathode, p-type doping region and n
Type doped region, just superfine grid line are contacted with p-type doping region, and the thin grid line of cathode is contacted with n-type doping region, just superfine grid line
It is electrically connected respectively with electric connector with the thin grid line of cathode, the just superfine grid line and cathode on any back contacts solar cell piece 31 are thin
The sum of quantity of grid line is 50-1000 root, the electric connector being electrically connected with any just superfine grid line or the thin grid line of cathode
Quantity is 1-100.
In an embodiment of the present invention, when back contacts solar cell piece be the back side without main grid IBC battery when, the back contacts sun
Cell piece is provided with just superfine grid line, the thin grid line of cathode, p-type doping region and n-type doping region, and just superfine grid line is mixed with p-type
Miscellaneous region contact, the thin grid line of cathode are contacted with n-type doping region, and just superfine grid line and the thin grid line of cathode are electric with electric connector respectively
Connection, passes through just superfine grid line and the thin grid line derived current of cathode.The just superfine grid line of any back contacts solar cell on piece with
The sum of quantity of the thin grid line of cathode is 50-1000 root, is electrically connected with what any just superfine grid line or the thin grid line of cathode were electrically connected
The quantity of junctor is 1-100.
Further, back contacts solar cell piece 31 is provided with just superfine grid line, the thin grid line of cathode, p-type doping region and n
Type doped region, just superfine grid line are contacted with p-type doping region, and the thin grid line of cathode is contacted with n-type doping region, just superfine grid line
It is electrically connected with positive connection electrode, the thin grid line of cathode is electrically connected with cathode connection electrode, and positive connection electrode connects electricity with cathode
Pole is electrically connected with electric connector respectively, the positive connection electrode and cathode connection electrode on any back contacts solar cell piece 31
The sum of quantity is 2-100 root, the quantity for the electric connector being electrically connected with any positive connection electrode or cathode connection electrode
It is 1-100.
In an embodiment of the present invention, when back contacts solar cell piece is that the back side has main grid IBC battery, the back contacts sun
Cell piece is provided with just superfine grid line, the thin grid line of cathode, p-type doping region and n-type doping region, and just superfine grid line is mixed with p-type
Miscellaneous region contact, the thin grid line of cathode are contacted with n-type doping region, and just superfine grid line is electrically connected with positive connection electrode, and cathode is thin
Grid line is electrically connected with cathode connection electrode, and positive connection electrode and cathode connection electrode are electrically connected with electric connector respectively, is passed through
Positive connection electrode and cathode connection electrode derived current.The positive connection electrode and cathode of any back contacts solar cell on piece
The sum of quantity of connection electrode is 2-100 root, is electrically connected with what any positive connection electrode or cathode connection electrode were electrically connected
The quantity of junctor is 1-100.
With reference to Fig. 5, further, back contacts solar cell piece 31 is provided with first electrode 32 and second electrode 36, and first
Electrode 32 includes thin gate electrode 33, runs through pore electrod 34 and the first connection electrode 35, thin gate electrode 33 and the first connection electrode 35
It is electrically connected respectively with through pore electrod 34, second electrode 36 includes transmission electrode 37 and the second connection electrode 38, transmission electrode 37
It is electrically connected with the second connection electrode 38, the front of back contacts solar cell piece 31 is provided with thin gate electrode 33, back contacts sun electricity
The back side of pond piece 31 is provided with the first connection electrode 35, transmission electrode 37 and the second connection electrode 38, any back contacts sun
The sum of quantity of the first connection electrode 35 and the second connection electrode 38 on cell piece 31 is 100-10000.
In an embodiment of the present invention, when back contacts solar cell piece is MWT battery, the setting of back contacts solar cell piece
Have a first electrode and second electrode, first electrode includes thin gate electrode, through pore electrod and the first connection electrode, thin gate electrode and
First connection electrode is electrically connected with through pore electrod respectively, and second electrode includes transmission electrode and the second connection electrode, transmission electricity
Pole is electrically connected with the second connection electrode, and the front of back contacts solar cell piece is provided with thin gate electrode, back contacts solar cell piece
The back side be provided with the first connection electrode, transmission electrode and the second connection electrode, the of any back contacts solar cell on piece
The sum of quantity of one connection electrode and the second connection electrode is 100-10000.
Further, the first connection electrode 35 and the second connection electrode 38 are in that lattice-like is arranged in back contacts solar cell piece
31 back side.
Further, the diameter of the first connection electrode 35 is 0.3-10mm, and the diameter of the second connection electrode 38 is 0.3-
10mm。
With reference to Fig. 6-15, further, back contacts solar cell piece 31 is regular hexagon back contacts solar cell piece, two points
A piece of regular hexagon back contacts solar cell piece, one third piece regular hexagon back contacts solar cell piece, quarter-wave plate
Regular hexagon back contacts solar cell piece, six/a piece of regular hexagon back contacts solar cell piece, ten half pieces positive six
Any one in the shape back contacts solar cell piece of side or a variety of combinations.
In an embodiment of the present invention, regular hexagon back contacts solar cell piece cuts to be formed positive six by crystalline silicon rod
Side shape crystal silicon chip is made.Relative to square solar cell piece, it can be improved the utilization rate of silicon rod, reduce solar panel
The manufacturing cost of part, regular hexagon back contacts solar cell piece are able to ascend single silicon chip area 16% or so, promote monolithic hair
Electrical power.Back contacts solar cell piece can be full wafer regular hexagon back contacts solar cell piece, half piece regular hexagon
Back contacts solar cell piece, one third piece regular hexagon back contacts solar cell piece, quarter-wave plate regular hexagon back contacts
Solar cell piece, six/a piece of regular hexagon back contacts solar cell piece, the ten half piece regular hexagon back contacts sun
Any one in cell piece or a variety of combinations.Full wafer regular hexagon back contacts solar cell piece is being cut into half
Piece regular hexagon back contacts solar cell piece, one third piece regular hexagon back contacts solar cell piece, quarter-wave plate positive six
Side shape back contacts solar cell piece, six/a piece of regular hexagon back contacts solar cell piece, ten half piece regular hexagons
It is that full wafer regular hexagon back contacts solar cell piece point cutting such as carried out to when back contacts solar cell piece.Convenient for being connect
Touching solar cell piece is arranged, and is reduced the difficulty of processing of back contacts solar module, is reduced manufacturing cost.
Another embodiment of the invention is the manufacturing method of back contacts solar module, comprising the following steps:
Conductive metal foil, adhesive layer 60 and polymer backboard 70 are successively bonded；
Patterned process is carried out to conductive metal foil, forms several conductive metal foil circuits 50；
Insulating layer 40 is formed backwards to the side of adhesive layer 60 in conductive metal foil circuit 50, insulating layer 40 has been positioned apart from
Several openings 42；
Electric connector 41 is passed through into opening 42, so that electric connector 41 is electrically connected with conductive metal foil circuit 50；
Several back contacts solar cell pieces 31 are laid with backwards to the side of conductive metal foil circuit 50 in insulating layer 40, form electricity
Pond lamella 30, the anode and cathode of any back contacts solar cell piece 31 pass through electric connector 41 and disjunct conductive gold respectively
Belong to foil circuit 50 to be electrically connected；
Encapsulated layer 20 and front shroud 10 before battery lamella 30 is successively laid with backwards to the side of insulating layer 40；
To polymer backboard 70, adhesive layer 60, conductive metal foil circuit 50, insulating layer 40, preceding encapsulated layer 20 and front shroud
10 are laminated, and back contacts solar module is obtained.
In an embodiment of the present invention, conductive metal foil, adhesive layer and polymer backboard are successively bonded, wherein bonding temperature
Degree is 100-160 DEG C, and the bonding time is 5-30 seconds.After fixed conductive metal foil, patterned process is carried out to conductive metal foil,
Conductive metal foil circuit is formed, can be prevented in the process to conductive metal foil, conductive metal foil generates offset, improves
The accuracy of conductive metal foil patterned process, meanwhile, it also can reduce the difficulty of processing of conductive metal foil, improve back and connect
Touch the processing efficiency of solar module.
Patterned process is carried out to conductive metal foil, can be punched with but not just for pass through machinery, laser is punched or chemistry
The mode of etching to conductive metal foil carry out patterned process, wherein laser punching for the conductive metal foil to continuous web-like into
Row patterned process.The electrode position and each back contacts that pattern on conductive metal foil depends on back contacts solar cell piece are too
Positive cell piece be it is in series or in parallel, the pattern on conductive metal foil can be various shape or size.Then, removal is led
Unwanted part on electric metal foil, to form conductive metal foil circuit.
Conductive metal foil circuit is electrically connected by electric connector with the realization of the electrode of battery lamella.It will need concatenated two pieces
Two different electrodes of back contacts solar cell piece and the same conductive metal foil electricity circuit connection, specifically, will wherein one
The cathode of positive and another piece of back contacts solar cell piece of block back contacts solar cell piece and same conductive metal foil electricity
Road electrical connection, by the anode of the cathode of one of back contacts solar cell piece and another piece of back contacts solar cell piece with it is same
One conductive metal foil circuit electrical connection.It will need two identical electrodes of two pieces of back contacts solar cell pieces in parallel and same
One conductive metal foil circuit electrical connection, specifically, by positive and another piece of back of one of back contacts solar cell piece
The anode of contact solar cell piece is electrically connected with the same conductive metal foil circuit, by one of back contacts solar cell piece
The cathode of cathode and another piece of back contacts solar cell piece is electrically connected with the same conductive metal foil circuit.Same back contacts
The anode and cathode of solar cell piece are electrically connected disjunct conductive metal foil circuit, and adjacent conductive metal foil electricity
It is provided with gap between road, avoids solar cell piece short circuit.
With reference to Fig. 1-3, several back contacts solar cell pieces, shape are laid with backwards to the side of conductive metal foil circuit in insulating layer
At battery lamella, back contacts solar cell piece, adjacent two panels solar cell can be laid with along horizontally or vertically direction
Mutually closely, the spacing of adjacent cell piece can control to a very small extent piece, it might even be possible to accomplish close to zero spacing, so that
The light-receiving area of back contacts solar module can increase, and improve the optoelectronic transformation efficiency of back contacts solar module.
By carrying out layer to polymer backboard, adhesive layer, conductive metal foil circuit, insulating layer, preceding encapsulated layer and front shroud
Pressure, obtains back contacts solar module, does not need to connect back contacts solar cell piece by way of welding welds, avoid
There is bending arculae in back contacts solar cell piece, reduces the fragment rate of solar cell piece.
Further, in conductive metal foil circuit 50 between the side of adhesive layer 60 formation insulating layer 40, insulating layer 40
Ground is provided with several openings 42, including,
Laser ablation, etching or mechanical stamping are carried out to insulating layer 40, form opening 42, then insulating layer 40 is laid on
Conductive metal foil circuit 50 is backwards to the side of adhesive layer 60.
In an embodiment of the present invention, when open amount is not that too much, can be less than or equal to but not just for open amount
500, at this point, insulating layer is the polymeric multilayer structure that several layers insulating materials and thermal glue layers are combined, burnt by laser
The methods of erosion, etching or mechanical stamping process opening.Insulating materials can be (poly- with but not just for PI (polyimides), PEN
(ethylene naphthalate)), PET (polyethylene terephthalate) or PP (polypropylene), the materials of thermal glue layers can with but
Not just for EVA, PVB or POE.Insulating layer can prevent from generating between neighbouring electrode short with sufficiently large insulation resistance
Road.Also, the component and thickness of insulating layer make it have certain thermal deformation resistant ability, so that insulating layer deforms in lamination process
Smaller, the electrode convenient for back contacts solar cell piece is aligned with electric connector, improves the processing of back contacts solar module
Accuracy improves yields.
Further, in conductive metal foil circuit 50 between the side of adhesive layer 60 formation insulating layer 40, insulating layer 40
Ground is provided with several openings 42, including,
Silk-screen printing or inkjet printing are carried out backwards to the side of adhesive layer 60 in conductive metal foil circuit 50, forms insulation
Layer 40.
In an embodiment of the present invention, when back contacts solar cell piece be the back side without main grid IBC battery when, and opening number
Measure it is more, when open amount reaches certain amount, when can be greater than 500 with but not just for open amount, in order to guarantee that electric current is led
Effect out, the open amount needed on the insulating layer is very huge, this can bring very big difficulty, follow-up process to processing
In the process, be aligned with conductive metal foil circuit also can be extremely difficult for insulating layer, can be in conductive metal foil circuit backwards to adhesive layer
Side carry out silk-screen printing or inkjet printing, form insulating layer, insulating layer is insulated rubber film, and the material of insulated rubber film can be with
But not just for insulating wax or dielectric ink.Silk-screen printing is carried out on conductive metal foil circuit or inkjet printing forms insulation
During layer, aperture position is reserved, that is, be formed simultaneously opening during forming insulating layer.It can guarantee to carry on the back
The machining accuracy of solar module is contacted, the difficulty of processing of back contacts solar module is reduced, guarantees back contacts sun electricity
The yields of pond component.
Further, the temperature of lamination is 140-150 DEG C, and the time of lamination is 5-15 minutes.
In an embodiment of the present invention, the temperature of lamination is 140-150 DEG C, and the time of lamination is 5-15 minutes, lamination
The time of temperature and lamination can be adjusted according to the material of preceding encapsulated layer.
Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.Those skilled in the art
Member is it should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic
Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature
Any combination and the other technical solutions formed.Such as features described above has similar function with (but being not limited to) disclosed herein
Can technical characteristic replaced mutually and the technical solution that is formed.
Claims (18)
1. a kind of back contacts solar module, which is characterized in that including battery lamella, the back side of the battery lamella is fixed to be connected
It is connected to insulating layer, the insulating layer is fixedly connected with several conductive metal foil circuits backwards to the side of the battery lamella, adjacent
The conductive metal foil circuit between be provided with gap, the battery lamella is provided with several back contacts solar cell pieces, appoint
The anode and cathode of the one back contacts solar cell piece pass through electric connector and the disjunct conductive metal foil electricity respectively
Road electrical connection, the conductive metal foil circuit are bonded with polymer backboard by adhesive layer backwards to the side of the battery lamella.
2. back contacts solar module according to claim 1, which is characterized in that the battery lamella is backwards to described exhausted
The side of edge layer is fixedly connected with preceding encapsulated layer, and the preceding encapsulated layer is fixedly connected with front cover backwards to the side of the battery lamella
Plate.
3. back contacts solar module according to claim 1, which is characterized in that the insulating layer has been positioned apart from
Several openings, the electric connector pass through the opening.
4. back contacts solar module according to claim 3, which is characterized in that the shape of the opening be it is round or
Person is rectangular, and the open amount is 100-50000 or 5000-2000000 or 100-10000.
5. back contacts solar module according to claim 1, which is characterized in that thickness≤500 of the insulating layer
Micron, and/or,
The adhesive layer with a thickness of 10-500 microns.
6. back contacts solar module according to claim 1, which is characterized in that the material of the conductive metal foil circuit
Material be copper foil or aluminium foil, the conductive metal foil circuit with a thickness of 10-100 microns.
7. back contacts solar module according to claim 1, which is characterized in that the insulating layer with a thickness of 50-
200 microns, and/or,
The conductive metal foil circuit with a thickness of 10-500 microns.
8. back contacts solar module according to claim 1, which is characterized in that positioned at the battery lamella edge
The conductive metal foil circuit exposes the battery lamella edge.
9. back contacts solar module according to claim 1, which is characterized in that the back contacts solar cell piece is set
It is equipped with just superfine grid line, the thin grid line of cathode, p-type doping region and n-type doping region, the just superfine grid line is mixed with the p-type
Miscellaneous region contact, the thin grid line of cathode are contacted with the n-type doping region, the just superfine grid line and the thin grid line of the cathode
It is electrically connected respectively with the electric connector, the just superfine grid line and the cathode of any back contacts solar cell on piece
The sum of the quantity of thin grid line is 50-1000 root, is electrically connected with any just superfine grid line or the thin grid line of the cathode
The quantity of the electric connector is 1-100.
10. back contacts solar module according to claim 1, which is characterized in that the back contacts solar cell piece
It is provided with just superfine grid line, the thin grid line of cathode, p-type doping region and n-type doping region, the just superfine grid line and the p-type
Doped region contact, the thin grid line of cathode are contacted with the n-type doping region, the just superfine grid line and positive connection electrode
Electrical connection, the thin grid line of cathode are electrically connected with cathode connection electrode, the anode connection electrode and the cathode connection electrode
It is electrically connected respectively with the electric connector, the positive connection electrode of any back contacts solar cell on piece and described negative
The sum of quantity of pole connection electrode is 2-100 root, with any positive connection electrode or cathode connection electrode electricity
The quantity of the electric connector of connection is 1-100.
11. back contacts solar module according to claim 1, which is characterized in that the back contacts solar cell piece
It is provided with first electrode and second electrode, the first electrode includes thin gate electrode, through pore electrod and the first connection electrode, institute
It states thin gate electrode and first connection electrode to be electrically connected with described through pore electrod respectively, the second electrode includes transmission electricity
Pole and the second connection electrode, the transmission electrode are electrically connected with second connection electrode, the back contacts solar cell piece
Front is provided with the thin gate electrode, and the back side of the back contacts solar cell piece is provided with first connection electrode, described
Transmission electrode and second connection electrode, first connection electrode of any back contacts solar cell on piece and institute
Stating the sum of quantity of the second connection electrode is 100-10000.
12. back contacts solar module according to claim 11, which is characterized in that first connection electrode and institute
State the back side that the second connection electrode is arranged in the back contacts solar cell piece in lattice-like.
13. back contacts solar module according to claim 11, which is characterized in that first connection electrode it is straight
Diameter is 0.3-10mm, and the diameter of second connection electrode is 0.3-10mm.
14. back contacts solar module according to claim 1, which is characterized in that the back contacts solar cell piece
For regular hexagon back contacts solar cell piece, half piece regular hexagon back contacts solar cell piece, one third piece positive six
Side shape back contacts solar cell piece, quarter-wave plate regular hexagon back contacts solar cell piece, six/a piece of regular hexagon back
Any one in contact solar cell piece, ten half piece regular hexagon back contacts solar cell pieces or a variety of combinations.
15. a kind of manufacturing method of back contacts solar module, which comprises the following steps:
Conductive metal foil, adhesive layer and polymer backboard are successively bonded；
Patterned process is carried out to the conductive metal foil, forms several conductive metal foil circuits；
Insulating layer is formed backwards to the side of the adhesive layer in the conductive metal foil circuit, the insulating layer has been positioned apart from
Several openings；
Electric connector is passed through into the opening, so that the electric connector is electrically connected with the conductive metal foil circuit；
Several back contacts solar cell pieces are laid with backwards to the side of the conductive metal foil circuit in the insulating layer, form battery
Lamella, the anode and cathode of any back contacts solar cell piece pass through the electric connector respectively described leads with disjunct
The electrical connection of electric metal foil circuit；
Encapsulated layer and front shroud before the battery lamella is successively laid with backwards to the side of the insulating layer；
To the polymer backboard, the adhesive layer, the conductive metal foil circuit, the insulating layer, the preceding encapsulated layer and
The front shroud is laminated, and back contacts solar module is obtained.
16. the manufacturing method of back contacts solar module according to claim 15, which is characterized in that in the conduction
Metal-foil circuits form insulating layer backwards to the side of the adhesive layer, and the insulating layer has been positioned apart from several openings, including,
Laser ablation, etching or mechanical stamping are carried out to the insulating layer, form the opening, then the insulating layer is laid with
In the conductive metal foil circuit backwards to the side of the adhesive layer.
17. the manufacturing method of back contacts solar module according to claim 15, which is characterized in that in the conduction
Metal-foil circuits form insulating layer backwards to the side of the adhesive layer, and the insulating layer has been positioned apart from several openings, including,
Silk-screen printing or inkjet printing are carried out backwards to the side of the adhesive layer in the conductive metal foil circuit, described in formation
Insulating layer.
18. the manufacturing method of back contacts solar module according to claim 15, which is characterized in that the lamination
Temperature is 140-150 DEG C, and the time of the lamination is 5-15 minutes.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201910146681.5A CN109904268A (en) | 2019-02-27 | 2019-02-27 | Back contacts solar module and its manufacturing method |
| PCT/CN2020/070938 WO2020173233A1 (en) | 2019-02-27 | 2020-01-08 | Back-contact solar cell assembly and manufacturing method therefor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910146681.5A CN109904268A (en) | 2019-02-27 | 2019-02-27 | Back contacts solar module and its manufacturing method |
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ID=66945545
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