CN109216478A - Single side imbrication solar cell module and preparation method - Google Patents
Single side imbrication solar cell module and preparation method Download PDFInfo
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- CN109216478A CN109216478A CN201810879131.XA CN201810879131A CN109216478A CN 109216478 A CN109216478 A CN 109216478A CN 201810879131 A CN201810879131 A CN 201810879131A CN 109216478 A CN109216478 A CN 109216478A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 18
- 238000005245 sintering Methods 0.000 claims abstract description 13
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical group [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 58
- 229910052710 silicon Inorganic materials 0.000 claims description 58
- 239000010703 silicon Substances 0.000 claims description 58
- 239000012634 fragment Substances 0.000 claims description 24
- 239000002002 slurry Substances 0.000 claims description 14
- 238000000137 annealing Methods 0.000 claims description 8
- 238000012360 testing method Methods 0.000 claims description 8
- 238000009792 diffusion process Methods 0.000 claims description 7
- 230000001681 protective effect Effects 0.000 claims description 7
- 238000003466 welding Methods 0.000 claims description 7
- 239000006227 byproduct Substances 0.000 claims description 5
- 230000003667 anti-reflective effect Effects 0.000 claims description 4
- 238000003854 Surface Print Methods 0.000 claims description 3
- 230000015572 biosynthetic process Effects 0.000 claims description 3
- 238000012545 processing Methods 0.000 abstract description 7
- 238000006243 chemical reaction Methods 0.000 abstract description 5
- 238000004519 manufacturing process Methods 0.000 description 12
- 238000000034 method Methods 0.000 description 12
- 238000010586 diagram Methods 0.000 description 10
- 238000013461 design Methods 0.000 description 9
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 9
- 238000004021 metal welding Methods 0.000 description 7
- 239000000853 adhesive Substances 0.000 description 5
- 230000001070 adhesive effect Effects 0.000 description 5
- 238000005520 cutting process Methods 0.000 description 5
- 230000005611 electricity Effects 0.000 description 5
- 238000003698 laser cutting Methods 0.000 description 5
- 239000000047 product Substances 0.000 description 5
- 230000011218 segmentation Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000377 silicon dioxide Substances 0.000 description 4
- 235000012239 silicon dioxide Nutrition 0.000 description 4
- 238000012546 transfer Methods 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N Alumina Chemical compound [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 229910052581 Si3N4 Inorganic materials 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 150000002739 metals Chemical class 0.000 description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 2
- 239000002210 silicon-based material Substances 0.000 description 2
- RZVAJINKPMORJF-UHFFFAOYSA-N Acetaminophen Chemical group CC(=O)NC1=CC=C(O)C=C1 RZVAJINKPMORJF-UHFFFAOYSA-N 0.000 description 1
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 1
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910003978 SiClx Inorganic materials 0.000 description 1
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- 239000002131 composite material Substances 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- SYHGEUNFJIGTRX-UHFFFAOYSA-N methylenedioxypyrovalerone Chemical compound C=1C=C2OCOC2=CC=1C(=O)C(CCC)N1CCCC1 SYHGEUNFJIGTRX-UHFFFAOYSA-N 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/02—Details
- H01L31/0224—Electrodes
- H01L31/022408—Electrodes for devices characterised by at least one potential jump barrier or surface barrier
- H01L31/022425—Electrodes for devices characterised by at least one potential jump barrier or surface barrier for solar cells
- H01L31/022433—Particular geometry of the grid contacts
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
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- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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- Condensed Matter Physics & Semiconductors (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- General Physics & Mathematics (AREA)
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- Microelectronics & Electronic Packaging (AREA)
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Abstract
The invention discloses a kind of single side imbrication solar cell modules, including at least two solar battery sheets, the solar battery sheet stacks gradually arrangement, form imbrication battery strings, the solar battery sheet includes front electrode and back surface field, the front electrode includes the secondary grid of front main grid and front, and the long side overlapping of the adjacent solar battery sheet forms face contact；The adjacent solar battery sheet is connected by front main grid electrode, and forms imbrication battery strings by sintering.Correspondingly, the present invention also provides a kind of preparation methods of single side imbrication solar cell module.Using the present invention, structure is simple, simplification of flowsheet, reduces processing step, reduces cost, and the high reliablity of battery component, and photoelectric conversion efficiency is high.
Description
Technical field
The present invention relates to area of solar cell more particularly to a kind of single side imbrication solar cell module and its preparation sides
Method.
Background technique
Conventional crystalline silicon component cell piece all uses metal welding band connection substantially.There are three obvious for this connection type
Defect: first is that metal welding band and cell piece gap occupy the positive light-receiving area of component；Second is that there are line losses for metal welding band；Third is that
Welding is expanded with heat and contract with cold by the temperature change period is easy to happen fracture and corrosion, these three modes are to the transfer efficiency of component and property
Stabilizability has large effect.
In order to overcome the above problem, there is a kind of technology that solar battery is connected into component using imbrication technology,
Conventional imbrication component is after being sliced cell piece, then cell piece is bonded bunchiness with special dedicated conducting resinl material.
Such as: the Chinese patent of Publication No. CN106489211A discloses and " covers formula solar cell module ", described
Solar energy module includes: the multiple superbatteries for being arranged to two or more parallels, and each superbattery includes being arranged to
The rectangle of straight line or multiple silicon solar cells of substantial rectangular, wherein adjacent silicon solar cell long side overlapping and each other
Directly conductively engage so that the silicon solar cell to be electrically connected in series；And the back surface positioned at the first solar battery
On hiding tap engagement pad, hiding tap engagement pad non-conducting high current in normal work；Wherein institute
The first solar battery is stated positioned at the middle position along first superbattery in superbattery described in first row, and
And the hiding tap engagement pad is electrically connected in parallel at least the second solar battery in superbattery described in second row.
It is attached between above-mentioned adjacent solar battery using conductive adhesive, complex process, connection effect is unstable
Gu increasing resistance loss, whole photoelectric conversion efficiency is influenced.
Moreover, it also requires the conductibility engagement between the adjacent solar battery being overlapped in superbattery to utilize
The conductibility between conductive adhesive and the superbattery and the flexible electrical interconnection engages the conductibility utilized
Adhesive is different.The complexity of technological operation can be further increased in this way, increases processing step, increases the chance of error, produced
The reliability of product is unable to get guarantee.
Summary of the invention
Technical problem to be solved by the present invention lies in, a kind of single side imbrication solar cell module is provided, structure is simple,
Simplification of flowsheet reduces processing step, reduces cost, and the high reliablity of battery component, and photoelectric conversion efficiency is high.
The technical problems to be solved by the invention also reside in, and provide a kind of preparation side of single side imbrication solar cell module
Method, simplification of flowsheet reduce processing step, and cost is relatively low, easy to spread, and photoelectric conversion efficiency is high.
In order to solve the above-mentioned technical problems, the present invention provides a kind of single side imbrication solar cell modules, including at least
Two solar battery sheets, the solar battery sheet stack gradually arrangement, form imbrication battery strings, which is characterized in that described
Solar battery sheet includes front electrode and back surface field, and the front electrode includes the secondary grid of front main grid and front, adjacent
The long side of the solar battery sheet is overlapped, and forms face contact；
The adjacent solar battery sheet is connected by front main grid electrode, and forms imbrication battery strings by sintering.
As the preferred embodiment of above scheme, the solar battery sheet is the fragment that formation is cut after silicon wafer pre-processes,
The front of each fragment is equipped with the secondary grid of a front main grid and multiple fronts.
As the preferred embodiment of above scheme, the adjacent solar battery sheet is connected by front main grid electrode, often
The front main grid of one solar battery sheet is set to the back side of preceding a piece of solar battery sheet.
As the preferred embodiment of above scheme, the solar battery sheet includes the first solar battery sheet and second sun
It can cell piece；
The front electrode of first solar battery sheet includes the secondary grid of front main grid and front, is not printed on back surface field
There is back side main grid；
The front electrode of second solar battery sheet includes the secondary grid of front main grid and front, is printed on back surface field
Back side main grid；
First solar battery sheet stacks gradually arrangement, is finally laminated and connects with the second solar battery sheet again.
As the preferred embodiment of above scheme, the imbrication battery strings are set as a row or multi-row imbrication battery strings；
Every row's imbrication battery strings include one or more first solar battery sheets and second solar battery sheet；
One or more first solar battery sheets stack gradually arrangement, are finally laminated and connect with the second solar battery sheet again
It connects, second solar battery sheet is set to outermost.
As the preferred embodiment of above scheme, the imbrication battery strings are set as multiple rows of imbrication battery strings, single imbrication electricity
Pass through series connection between the solar battery sheet of pond string.
As the preferred embodiment of above scheme, the area of the overlapping region of adjacent solar battery sheet is monolithic solar energy
The 0.5-20% of cell piece area.
Correspondingly, invention additionally discloses a kind of preparation methods of single side imbrication solar cell module, comprising:
(1) it is pre-processed in silicon wafer, and prints front electrode, back surface field and back side main grid in silicon chip surface；
(2) silicon wafer is cut, forms solar battery sheet；
(3) solar battery sheet is laminated to arrangement one by one, the long side of the adjacent solar battery sheet is overlapped and passes through
Front main grid is connected, and forms imbrication battery strings, and dry；
(4) high temperature sintering is carried out to imbrication battery strings, makes slurry curing；
(5) anti-LID annealing is carried out after stepping test to imbrication battery strings and is packaged into imbrication component.
Correspondingly, invention additionally discloses the preparation methods of another single side imbrication solar cell module, comprising:
(1) silicon wafer is pre-processed, is then cut, form solar battery sheet；
(2) in solar battery sheet surface printing front electrode, back surface field and back side main grid；
(3) solar battery sheet is laminated to arrangement one by one, the long side of the adjacent solar battery sheet is overlapped and passes through
Front main grid is connected, and forms imbrication battery strings, and dry；
(4) high temperature sintering is carried out to imbrication battery strings, makes slurry curing；
(5) anti-LID annealing is carried out after stepping test to imbrication battery strings and is packaged into imbrication component.
As the preferred embodiment of above scheme, silicon wafer is pre-processed, the pretreatment includes:
(1.1) flannelette is formed in front side of silicon wafer；
(1.2) high square resistance diffusion is carried out in front side of silicon wafer, forms PN junction；
(1.3) selective laser doping is carried out to front side of silicon wafer；
(1.4) by-product and periphery P N knot that removal diffusion process is formed, and silicon chip back side is polished；
(1.5) passivating film and protective film are deposited in silicon chip back side；
(1.6) passivating film and antireflective film are deposited in front side of silicon wafer；
(1.7) laser slotting is carried out to the passivating film of silicon chip back side and protective film.
The invention has the following beneficial effects:
The present invention provides a kind of single side imbrication solar cell module, including at least two solar battery sheets, adjacent
The long side of the solar battery sheet is overlapped, and forms face contact；And the adjacent solar battery sheet passes through front main grid electricity
Extremely it is connected, and imbrication battery strings is formed by sintering, has the advantage that
1, between the adjacent fragment of the present invention using the connection type for sharing front main grid slurry, replace conventional imbrication battery it
Between conductive adhesive, laser cutting is connected with the imbrication of fragment and is dissolved into battery manufacturing process, back side main grid is saved and starches
Material, while the manufacturing process of single side imbrication component is enormously simplified, reduce equipment cost and production cost；
2, single side imbrication electricity is also simplified using the connection type for sharing front main grid slurry between the adjacent fragment of the present invention
The design requirement of pond pattern no longer needs to consider the symmetric form of slice pattern, without increasing orientation point and welding positioning
The design of point, increases the flexibility of positive back surface field graphic designs；
3, using the connection type for sharing front main grid slurry between the adjacent fragment of the present invention, the mode with conductive glue connection
It compares, reduces series resistance and resistance loss, be obviously improved the power of single side imbrication component；
4, front main grid slurry is shared between the adjacent fragment of the present invention, imbrication battery strings can be formed by sintering, i.e.,
The preparation process of imbrication battery strings is incorporated in conventional solar cells manufacturing process, process flow is further simplified, reduces work
Skill step, reduces cost.And the prior art is first to prepare product, then fragment by conventional solar cells, then presses imbrication again
Technology is prepared into imbrication component, and two preparation flows of the prior art are independent from each other；
5, process flow of the invention is relatively simple, and each processing step is all more mature, and incorporates regular solar
In battery manufacturing process, the probability to malfunction in manufacturing process is reduced, the reliability of product is increased；
6, solar battery sheet is connected by the way of the imbrication of front and back inside battery strings of the present invention, and surface does not have metal welding
Band, it is also very close to each other between cell piece, area workable for assembly surface is taken full advantage of, the line loss of conventional metals welding is reduced,
Therefore the transfer efficiency of component is greatly improved；
7, traditional metal welding band connection mode is line connection, and imbrication component of the present invention is then face connection, is effectively promoted
Attachment force between cell piece, keeps the component more reliable.
Detailed description of the invention
Fig. 1 is the segmentation schematic diagram of front side of silicon wafer of the present invention；
Fig. 2 is the segmentation schematic diagram of one embodiment of silicon chip back side of the present invention；
Fig. 3 is the segmentation schematic diagram of another embodiment of silicon chip back side of the present invention；
Fig. 4 is schematic diagram of the imbrication component of the present invention during arrangement is laminated；
Fig. 5 is the positive structural schematic diagram of imbrication component made from Fig. 4；
Fig. 6 is the structural schematic diagram at the back side of imbrication component made from Fig. 4；
Fig. 7 is the sectional view of imbrication component made from Fig. 4；
Fig. 8 is schematic diagram of the imbrication component of the present invention during another stacking arrangement；
Fig. 9 is the positive structural schematic diagram of imbrication component made from Fig. 8；
Figure 10 is the structural schematic diagram at the back side of imbrication component made from Fig. 8；
Figure 11 is the sectional view of imbrication component made from Fig. 8；
Figure 12 is the flow chart of the preparation method of single side imbrication solar cell module of the present invention；
Figure 13 is the flow chart of another preparation method of single side imbrication solar cell module of the present invention.
Specific embodiment
To make the object, technical solutions and advantages of the present invention clearer, the present invention is made into one below in conjunction with attached drawing
Step ground detailed description.
It is described the present invention provides a kind of single side imbrication solar cell module, including at least two solar battery sheets 1
Solar battery sheet 1 stacks gradually arrangement, forms imbrication battery strings 10.Wherein, the solar battery sheet 1 includes front electrode
And back surface field, the front electrode include the secondary grid 12 of front main grid 11 and front, are printed at least on the back surface field 13
A piece back side main grid 14.
As shown in Figure 1, Figure 2 and Figure 3, the solar battery sheet 1 is the fragment that formation is cut after silicon wafer pre-processes, each
The front of fragment is equipped with the secondary grid 12 (as shown in Figure 1) of a front main grid 11 and multiple fronts, sets on the back side of each fragment
There are back surface field 13 and back side main grid 14 (as shown in Figure 2), alternatively, the back side of each fragment is equipped with multiple back surface fields 13
(as shown in Figure 3).Dotted line in Fig. 1, Fig. 2 and Fig. 3 is the cutting line of silicon wafer.
It should be noted that main grid of the invention and secondary grid can be the forms such as straight line, segmentation, curve, laser cut line
It is also possible to straight line or curve, and is not limited thereto.Moreover, the present invention is also provided with ridge other than main grid, secondary grid
Bone, the embodiment multiplicity of the solar cell module, embodiment of the present invention are not limited to illustrated embodiment.
As shown in figure 4, the present invention is during being laminated arrangement, the adjacent solar battery sheet 1 passes through front main grid
11 electrodes are connected, and the front main grid 11 of each solar battery sheet is set to the back side of preceding a piece of solar battery sheet.Such as Fig. 5, Fig. 6
With shown in Fig. 7, imbrication battery strings after assembling, the long side overlapping of the adjacent solar battery sheet 1 forms face contact；Phase
The adjacent solar battery sheet 1 is connected by front main grid electrode, and forms imbrication battery strings 10 by sintering.
And Fig. 8-11 is that the solar battery sheet 1 of another embodiment forms the schematic diagram of imbrication battery strings 10, with Fig. 3-5
Shown imbrication battery strings the difference is that Fig. 8-11 selects the solar battery sheet of another shape, the shape is similar be it is trapezoidal, be
The outside fragment of silicon wafer segmentation.
It should be noted that being, the present invention can select the solar battery sheet of various shapes, be preferably rectangle, ladder
Shape, or similar rectangle, it is similar trapezoidal, but not limited to this.
The present invention is cut into solar battery sheet after pre-processing traditional silicon wafer, solar battery sheet uses front and back imbrication
Mode connects, and surface does not have a metal welding band, also very close to each other between cell piece, takes full advantage of area workable for assembly surface,
The line loss of conventional metals welding is reduced, therefore greatly improves the transfer efficiency of component.
Moreover, traditional metal welding band connection mode is line connection, and imbrication component of the present invention is then face connection, is effectively mentioned
The attachment force between cell piece has been risen, has kept component more reliable.
Most of all, being replaced conventional between the adjacent fragment of the present invention using the connection type for sharing front main grid slurry
Laser cutting is connected with the imbrication of fragment and is dissolved into battery manufacturing process, saved by the conductive adhesive between imbrication battery
Back side main grid paste, while the manufacturing process of single side imbrication component is enormously simplified, reduce equipment cost and production cost.
Using the connection type for sharing front main grid slurry between the adjacent fragment of the present invention, single side imbrication battery is also simplified
The design requirement of pattern no longer needs to consider the symmetric form of slice pattern, without increasing orientation point and welding anchor point
Design, increase the flexibility of positive back surface field graphic designs.
Using the connection type for sharing front main grid slurry between the adjacent fragment of the present invention, the mode phase with conductive glue connection
Than reducing series resistance and resistance loss, being obviously improved the power of single side imbrication component.
Preferably, as seen in figs. 7 and 11, the area of the overlapping region 2 of adjacent solar battery sheet 1 is the monolithic sun
The 0.5-20% of energy 1 area of cell piece, it is ensured that the adjacent solar battery sheet is connected by front main grid electrode
Stability reduces series resistance and resistance loss, is obviously improved the power of single side imbrication component.Moreover, it is also possible to simplify system
The difficulty of standby technique, saves the silicon material of overlapping region, makes with the implementation of lower cost.When the overlapping of adjacent solar battery sheet
When the area in region is the 0.5-20% of monolithic solar cell piece area, series resistance and resistance loss can be in bases of the present invention
Under the premise of plinth scheme, 10% is additionally reduced.If the area of the overlapping region of adjacent solar battery sheet is less than the monolithic sun
The 0.5% of energy cell piece area, the width for sharing main grid is just smaller, influences the transmission of electric current；If adjacent solar battery sheet
Overlapping region area be greater than monolithic solar cell piece area 20%, series resistance and resistance loss do not obtain obviously
It reducing, the photoelectric conversion efficiency of solar energy cannot be obviously improved, moreover, overlapping region area is bigger, the dosage of silicon material
It is more.Therefore, overlapping area needs to take an equilibrium valve.It is further preferred that the overlapping region of adjacent solar battery sheet 1
2 area is the 1-10% of 1 area of monolithic solar cell piece.More preferably, the overlapping region 2 of adjacent solar battery sheet 1
Area be 1 area of monolithic solar cell piece 2-8%.
Imbrication battery strings 10 of the invention can be set to a row or multi-row imbrication battery strings, every row's imbrication battery strings 10
Pass through series connection between solar battery sheet 1.And when imbrication battery strings 10 are set as multiple rows of, single imbrication battery strings 10
Pass through series connection between solar battery sheet 1；The back side main grid of second cell piece uses between difference row's imbrication battery strings 10
The connection of in parallel or other modes, connection type multiplicity, the present invention are defined not to this.Preferably, different row's imbrication electricity
It is connected in parallel or series between pond string 10 by welding.
In every row's imbrication battery strings 10, it is located at positive front main grid 11 and is used as cathode, the back side main grid 14 positioned at the back side
As anode.In general, being located at the side that positive front main grid 11 is set to row's imbrication battery strings 10, positioned at the back side
Back side main grid 14 is then set to the other side of row's imbrication battery strings 10.At this point, be set to the other side of row's imbrication battery strings
The back surface field of solar battery sheet is additionally provided with back side main grid.
In order to preferably describe this technical solution, the present invention divides solar battery sheet 1 for the first solar battery sheet
With the second solar battery sheet；The front electrode of first solar battery sheet includes the secondary grid 12 of front main grid 11 and front,
Back side main grid 14 is not printed on back surface field 13；The front electrode of second solar battery sheet includes 11 He of front main grid
Positive pair grid 12 are printed with back side main grid 14 on back surface field 13, and the purpose of back side main grid 14 is between imbrication battery strings
Connection.First solar battery sheet stacks gradually arrangement, is finally laminated and connects with the second solar battery sheet again.
Preferably, every row's imbrication battery strings 10 include one or more first solar battery sheets and second solar energy
Cell piece；One or more first solar battery sheets stack gradually arrangement, are finally laminated and connect with the second solar battery sheet again
It connects, second solar battery sheet is set to outermost.
Correspondingly, invention additionally discloses a kind of preparation methods of single side imbrication solar cell module, and as shown in figure 12, packet
It includes:
S101, it is pre-processed in silicon wafer, and prints front electrode, back surface field and back side main grid in silicon chip surface；
Specifically, according to the design of electrode, in the secondary grid of front side of silicon wafer printing front main grid and front, in the back of silicon wafer
Face printed back electric field and back side main grid.It should be noted that back side main grid is equipped with 1-2 root.
S102, silicon wafer is cut, forms solar battery sheet；
Solar battery sheet after cutting includes the first solar battery sheet and the second solar battery sheet；Described first too
The front electrode of positive energy cell piece includes the secondary grid 12 of front main grid 11 and front, is not printed with back side main grid on back surface field 13
14；The front electrode of second solar battery sheet includes the secondary grid 12 of front main grid 11 and front, is printed on back surface field 13
There is back side main grid 14.
The cutting is preferentially using laser cutting, it is not easy to lead to fragment, while can guarantee the accuracy of size.
S103, solar battery sheet is laminated to arrangement one by one, the long side of the adjacent solar battery sheet is overlapped and leads to
It crosses front main grid to be connected, forms imbrication battery strings, and dry；
Specifically, every row's imbrication battery strings 10 include one or more first solar battery sheets and second solar energy
Cell piece；One or more first solar battery sheets stack gradually arrangement, are finally laminated and connect with the second solar battery sheet again
It connects, second solar battery sheet is set to outermost.
Pass through the connection of in parallel or other modes, connection between the solar battery sheet 1 of difference row's imbrication battery strings 10
Mode multiplicity, the present invention are defined not to this.
S104, high temperature sintering is carried out to imbrication battery strings, makes slurry curing；
S105, imbrication battery strings are carried out with anti-LID annealing, after stepping test, is packaged into imbrication component.
It should be noted that anti-LID annealing just refers to that photo attenuation is annealed.
After stepping test, by the cell package of identical gear to the same component, guarantee component Maximum Power Output and
Guarantee the stability of power output.
The present invention can be using the preparation method of another single side imbrication solar cell module, as shown in figure 13, comprising:
S201, silicon wafer is pre-processed, is then cut, form solar battery sheet；
The cutting is preferentially using laser cutting, it is not easy to lead to fragment, while can guarantee the accuracy of size.
S202, in solar battery sheet surface printing front electrode, back surface field and back side main grid；
Solar battery sheet includes the first solar battery sheet and the second solar battery sheet；First solar battery
The front electrode of piece includes the secondary grid 12 of front main grid 11 and front, is not printed with back side main grid 14 on back surface field 13；Described
The front electrode of two solar battery sheets includes the secondary grid 12 of front main grid 11 and front, is printed with back side main grid on back surface field 13
14；The present invention is printed according to the design of above-mentioned first solar battery sheet and the second solar battery sheet.
S203, solar battery sheet is laminated to arrangement one by one, the long side of the adjacent solar battery sheet is overlapped and leads to
It crosses front main grid to be connected, forms imbrication battery strings, and dry；
Specifically, every row's imbrication battery strings 10 include one or more first solar battery sheets and second solar energy
Cell piece；One or more first solar battery sheets stack gradually arrangement, are finally laminated and connect with the second solar battery sheet again
It connects, second solar battery sheet is set to outermost.
Pass through the connection of in parallel or other modes, connection between the solar battery sheet 1 of difference row's imbrication battery strings 10
Mode multiplicity, the present invention are defined not to this.
S204, high temperature sintering is carried out to imbrication battery strings, makes slurry curing；
S205, imbrication battery strings are carried out with anti-LID annealing, after stepping test, is packaged into imbrication component.
It should be noted that anti-LID annealing just refers to that photo attenuation is annealed.
After stepping test, by the cell package of identical gear to the same component, guarantee component Maximum Power Output and
Guarantee the stability of power output.
Laser cutting is connected with the imbrication of fragment and is dissolved into battery manufacturing process by the present invention, is shared between adjacent fragment
Front main grid slurry can form imbrication battery strings by sintering, be further simplified process flow, reduce processing step, drop
Low cost.And the prior art is first to prepare product, then fragment by conventional solar cells, then again by imbrication technology system
For at imbrication component, two preparation flows of the prior art are independent from each other.
Also, process flow of the invention is relatively simple, and each processing step is all more mature, and incorporates the common sun
In energy battery manufacturing process, the probability to malfunction in manufacturing process is reduced, the reliability of product is increased.
Preparation method shown in Figure 12 and Figure 13 the difference is that, it is described cutting be set to printing front electrode and the back side electricity
Before or after.
Further, described pre-process includes:
(1.1) flannelette is formed in front side of silicon wafer；
The silicon wafer can select P-type silicon or N-type silicon.
(1.2) high square resistance diffusion is carried out in front side of silicon wafer, forms PN junction；
Sheet resistance is generally preferred to 80-200 Ω/, but not limited to this.
(1.3) selective laser doping is carried out to front side of silicon wafer；
Laser doping pattern needs are corresponding with subsequent front electrode pair gate pattern, use prior art design i.e.
It can.
(1.4) by-product and periphery P N knot that removal diffusion process is formed, and silicon chip back side is polished；
N-type silicon is formed in front side of silicon wafer according to phosphorus diffusion, by-product is phosphorosilicate glass；
Front side of silicon wafer is diffused according to boron and forms P-type silicon, and by-product is Pyrex.
(1.5) passivating film and protective film are deposited in silicon chip back side；
The passivating film is preferably silicon dioxide film, di-aluminium trioxide film or silicon nitride film, and protective film preferably nitrogenizes
Silicon fiml, silicon oxynitride film, silicon dioxide film or the composite membrane being made of above-mentioned film, but not limited to this.
(1.6) passivating film and antireflective film are deposited in front side of silicon wafer；
The passivating film is preferably silicon dioxide film, di-aluminium trioxide film or silicon nitride film；The antireflective film is preferably nitrogen
SiClx film or silicon dioxide film, but not limited to this.
(1.7) laser slotting is carried out to the passivating film of silicon chip back side and protective film.
Laser slotting pattern is corresponding with subsequent back side pair grid line pattern, generally linear type or line segment type.
Finally, it should be noted that the above embodiments are merely illustrative of the technical solutions of the present invention rather than protects to the present invention
The limitation of range is protected, although the invention is described in detail with reference to the preferred embodiments, those skilled in the art should
Understand, it can be with modification or equivalent replacement of the technical solution of the present invention are made, without departing from the essence of technical solution of the present invention
And range.
Claims (10)
1. a kind of single side imbrication solar cell module, including at least two solar battery sheets, the solar battery sheet according to
Secondary stacking arrangement, forms imbrication battery strings, which is characterized in that and the solar battery sheet includes front electrode and back surface field,
The front electrode includes the secondary grid of front main grid and front, and the long side of the adjacent solar battery sheet is overlapped, and forming face connects
Touching；
The adjacent solar battery sheet is connected by front main grid electrode, and forms imbrication battery strings by sintering.
2. single side imbrication solar cell module as described in claim 1, which is characterized in that the solar battery sheet is silicon wafer
The fragment of formation is cut after pretreatment, the front of each fragment is equipped with the secondary grid of a front main grid and multiple fronts.
3. single side imbrication solar cell module as described in claim 1, which is characterized in that the adjacent solar battery sheet
It is connected by front main grid electrode, the front main grid of each solar battery sheet is set to the back side of preceding a piece of solar battery sheet.
4. single side imbrication solar cell module as described in claim 1, which is characterized in that the solar battery sheet includes the
One solar battery sheet and the second solar battery sheet；
The front electrode of first solar battery sheet includes the secondary grid of front main grid and front, is not printed with back on back surface field
Face main grid；
The front electrode of second solar battery sheet includes the secondary grid of front main grid and front, is printed with the back side on back surface field
Main grid；
First solar battery sheet stacks gradually arrangement, is finally laminated and connects with the second solar battery sheet again.
5. single side imbrication solar cell module as claimed in claim 4, which is characterized in that the imbrication battery strings are set as one
Row or multiple rows of imbrication battery strings；
Every row's imbrication battery strings include one or more first solar battery sheets and second solar battery sheet；
One or more first solar battery sheets stack gradually arrangement, are finally laminated and connect with the second solar battery sheet again,
Second solar battery sheet is set to outermost.
6. single side imbrication solar cell module as claimed in claim 5, which is characterized in that the imbrication battery strings are set as more
Arrange imbrication battery strings, by being connected in series between the solar battery sheet of single imbrication battery strings, difference row imbrication battery strings it
Between connected in parallel or series by welding.
7. single side imbrication solar cell module as described in claim 1, which is characterized in that the weight of adjacent solar battery sheet
The area in folded region is the 0.5-20% of monolithic solar cell piece area.
8. a kind of preparation method of such as described in any item single side imbrication solar cell modules of claim 1-7, feature exist
In, comprising:
(1) it is pre-processed in silicon wafer, and prints front electrode, back surface field and back side main grid in silicon chip surface；
(2) silicon wafer is cut, forms solar battery sheet；
(3) solar battery sheet is laminated to arrangement one by one, the long side of the adjacent solar battery sheet is overlapped and passes through front
Main grid is connected, and forms imbrication battery strings, and dry；
(4) high temperature sintering is carried out to imbrication battery strings, makes slurry curing；
(5) anti-LID annealing is carried out after stepping test to imbrication battery strings and is packaged into imbrication component.
9. a kind of preparation method of such as described in any item single side imbrication solar cell modules of claim 1-7, feature exist
In, comprising:
(1) silicon wafer is pre-processed, is then cut, form solar battery sheet；
(2) in solar battery sheet surface printing front electrode, back surface field and back side main grid；
(3) solar battery sheet is laminated to arrangement one by one, the long side of the adjacent solar battery sheet is overlapped and passes through front
Main grid is connected, and forms imbrication battery strings, and dry；
(4) high temperature sintering is carried out to imbrication battery strings, makes slurry curing；
(5) anti-LID annealing is carried out after stepping test to imbrication battery strings and is packaged into imbrication component.
10. the preparation method of single side imbrication solar cell module as described in claim 8 or 9, which is characterized in that silicon wafer into
Row pretreatment, the pretreatment include:
(1.1) flannelette is formed in front side of silicon wafer；
(1.2) high square resistance diffusion is carried out in front side of silicon wafer, forms PN junction；
(1.3) selective laser doping is carried out to front side of silicon wafer；
(1.4) by-product and periphery P N knot that removal diffusion process is formed, and silicon chip back side is polished；
(1.5) passivating film and protective film are deposited in silicon chip back side；
(1.6) passivating film and antireflective film are deposited in front side of silicon wafer；
(1.7) laser slotting is carried out to the passivating film of silicon chip back side and protective film.
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