CN102938432B - A kind of preparation method of MWT solar module - Google Patents
A kind of preparation method of MWT solar module Download PDFInfo
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- CN102938432B CN102938432B CN201210422972.0A CN201210422972A CN102938432B CN 102938432 B CN102938432 B CN 102938432B CN 201210422972 A CN201210422972 A CN 201210422972A CN 102938432 B CN102938432 B CN 102938432B
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Abstract
The invention discloses the preparation method of MWT solar module, at the both positive and negative polarity contact electrode of MWT back of solar cell printing asymmetric distribution, and sinter; Positive and negative contact electrode arranges welding respectively, through soldering, welding is connected with positive and negative contact electrode respectively, and by welding welding, adjacent MWT solar cell is in series, form series welding cell piece; Each assembly pressed the order arrangement of glass, EVA, series welding cell piece, EVA and back veneer material and form MWT solar module through containing lamination, solidification and packaging process process.The method does not need each both positive and negative polarity contact point on battery to aim at the accurate of the contact point on electrically-conductive backing plate, the high-insulation between cell backside noncontact position and electrically-conductive backing plate is not needed yet, need not improve the manufacture craft of MWT solar cell, do not need to improve too much existing subassembly line yet, with low cost, flow process is simple to operation, can be applied directly in large-scale production.
Description
Technical field
The invention belongs to technical field of solar cells, be specifically related to a kind of preparation method of MWT solar module.
Background technology
Photovoltaic technology is a technology utilizing large-area p-n junction diode to convert solar energy into electrical energy.This p-n junction diode is called solar cell.In traditional solar cell, emitter contact electrode and base stage contact electrode are configured in the tow sides of cell piece respectively.The metal grid lines electrode of contact emitter manufactures the front of exposing to sunlight, and therefore the part surface of battery is covered by metal, causes a part of optical loss.The front shading-area of ordinary silicon base battery, about 7%, reduces the efficiency that shading-area can directly improve.
" metal is worn and led (MetalWrapThrough) battery ", being called for short MWT battery, is the battery that a kind of emitter contact electrode and base stage contact electrode are all positioned at cell backside.In MWT battery structure, the contact electrode being positioned at the emitter of battery sensitive surface to cell backside, is all positioned at cell backside with base stage contact electrode by silicon substrate navigation inside the body, and the extremely collected electric current of surface emitting is flowed out by the back side of battery.Compared with conventional solar cell, the conduction main gate line of battery front side replaced by the emission electrode being positioned at the back side, and the shading-area in cell piece front reduces, and the area accepting illumination increases, effectively increase the short circuit current of cell piece, thus cell power conversion efficiency is improved.Fig. 1 provides the sectional view of conventional MWT solar cell.
Positive and negative electrode due to MWT solar cell is all positioned at the back side of battery, and when making solar photovoltaic assembly, owing to the surface of MWT battery not being conducted electricity main gate line, the connection therefore between cell piece must contact all overleaf.Fig. 2 provides the distribution of electrodes of conventional MWT solar cell.MWT battery assembly generally adopts the back of the body to use the encapsulation technology of point contact type, uses conducting resinl to be connected with the direct of the contact point that electrically-conductive backing plate is made in advance by the both positive and negative polarity contact point of cell backside.The advantage of this encapsulation technology can greatly reduce contact resistance loss, thus improve the power output of assembly, makes battery drop to minimum to assembly (CTM) loss.But its shortcoming is that component package requires that each both positive and negative polarity contact point on battery is aimed at the accurate of the contact point on electrically-conductive backing plate, high-insulation between cell backside noncontact position and electrically-conductive backing plate, therefore component package equipment must be increasingly automated, completely different from the component package equipment of now widely used welding connected mode.The technology of electrically-conductive backing plate is still immature at present simultaneously, and cost is higher relative to prior welding mode.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of preparation method of MWT solar module, this preparation method does not need each both positive and negative polarity contact point on battery to aim at the accurate of the contact point on electrically-conductive backing plate, the high-insulation between cell backside noncontact position and electrically-conductive backing plate is not needed yet, need not improve the manufacture craft of MWT solar cell, do not need to improve too much existing subassembly line yet, with low cost, flow process is simple to operation, can be applied directly in large-scale production.
Above-mentioned technical problem of the present invention is achieved through the following technical solutions: a kind of preparation method of MWT solar module, containing following steps:
(1) at the both positive and negative polarity contact electrode of MWT back of solar cell printing asymmetric distribution, wherein positive contact electrode is made up of the positive electrode contact point in (N+1) × (N-1) or N × (N-1) array arrangement, cathode contact electrode is made up of the negative electrode contact point in N × N array arrangement, and each row positive electrode contact point and negative electrode contact point distribute alternately;
(2) last negative electrode contact point of described often row negative electrode contact point has line stretcher, and described line stretcher ends at but discontiguous position mutually concordant with last positive electrode contact point of adjacent column;
(3) after both positive and negative polarity contact electrode being sintered, the positive and negative contact electrode of each row arranges welding respectively, described welding is provided with the hole corresponding with positive and negative electrode contact point, realizes welding be connected with each contact point of positive and negative contact electrode by injecting scolding tin in hole;
(4) adopt welding to carry out welding the series connection realizing adjacent MWT solar cell, form series welding cell piece;
(5) following assembly is also formed MWT solar module through containing lamination, solidification and packaging process process according to the order arrangement of glass, EVA, series welding cell piece, EVA and back veneer material.
In above-mentioned steps:
In step of the present invention (1), positive contact electrode is preferably made up of the positive electrode contact point in 5 × 3 or 4 × 3 array arrangements, and cathode contact electrode is preferably made up of the negative electrode contact point in 4 × 4 array arrangements.
In step of the present invention (1), each row positive electrode contact point spacing is identical, and the spacing of each row negative electrode contact point is also identical; Spacing between each row positive electrode contact point is identical, and the spacing between each row negative electrode contact point is also identical.
In step of the present invention (1), first row is also identical with the distance between last row negative electrode contact point with MWT solar cell piece edge.
The shape of positive and negative electrode contact point described in step of the present invention (1) is circular or square, and diameter or the square length of side size of described circle are 1mm ~ 7mm.
The shape of line stretcher described in step of the present invention (2) is straight line, oblique line, L shape line style or curve.
When the shape of line stretcher of the present invention is straight line, the angle of described straight line and cathode contact electrode is 90 °, and when the shape of described line stretcher is oblique line, the angle of described oblique line and cathode contact electrode is 45 ° ~ 90 °.
After being sintered by both positive and negative polarity contact electrode in step of the present invention (3), at cathode contact printed on electrodes insulation paste, drying process makes to insulate between positive and negative contact electrode; Or before both positive and negative polarity contact electrode is sintered, insulation paste is printed on cathode contact electrode, makes to insulate between positive and negative contact electrode through sintering.
Described in step of the present invention (3), the minimum straight warp in hole is 0.05mm, maximum straight through being no more than the size of positive and negative electrode contact point.
Described in step of the present invention (3) and (4), the width of welding is 1.5 ~ 10.0mm, and thickness is not less than 0.10mm, and length is not more than the length of side of MWT solar cell.
Compared with prior art, tool of the present invention has the following advantages:
(1) first the present invention adopts the asymmetric electrode design being different from conventional pattern on MWT rear surface of solar cell, negative pole is guided to and is arranged in same welding region with positive pole, wherein the negative electrode contact point of a minimum row is extended and comes into line with positive electrode contact point, this design can be easy to improve slightly metallization process in MWT battery manufacturing process be achieved, and does not have any negative effect to the performance of MWT battery;
(2) in order to ensure electric insulation, the present invention prints one deck insulation paste on the negative regions in MWT finished product solar cell back face, and its pattern suitably adjusts according to the change of negative pole position, and drying process makes to insulate between positive and negative contact electrode; Or before both positive and negative polarity contact electrode is sintered, insulation paste is printed on cathode contact electrode, makes to insulate between positive and negative contact electrode through sintering;
(3) the present invention by arranging welding respectively on the positive and negative contact electrode of each row, welding is provided with the hole corresponding with positive and negative electrode contact point, realize welding be connected with each contact point of positive and negative contact electrode by injecting scolding tin in hole, and adopt welding to carry out welding the series connection realizing adjacent MWT solar cell, form series welding cell piece; Being connected by welding to make a MWT battery back positive electrode directly be connected with another MWT battery back side negative electrode, thus directly can use in the manufacture craft of MWT solar module by traditional components welding procedure production line;
(4) the MWT structure solar module preparation method that makes of preparation method of the present invention is simple, high-quality is reliable, adopt the preparation method in the present invention need not improve the manufacture craft of MWT solar cell, do not need to improve too much existing subassembly line yet, with low cost, flow process is simple to operation, can be applied directly in large-scale production.
Accompanying drawing explanation
Fig. 1 is the structural representation of conventional MWT solar cell, and wherein 1 is the contact of front side emitter pole, and 2 is antireflective coating, and 3 is emitter, and 4 is through hole, and 5 is the contact of back side emitter pole, and 6 is base stage contact, and 7 is cell piece matrix;
Fig. 2 is the distribution of electrodes figure of conventional MWT solar cell;
Fig. 3 A is the MWT rear surface of solar cell electrode lay-out figure of preparation in the embodiment of the present invention 1, and wherein 8 is line stretcher;
Fig. 3 B is the MWT rear surface of solar cell electrode lay-out figure of preparation in the embodiment of the present invention 2, and wherein 8 is line stretcher;
Fig. 3 C is the MWT rear surface of solar cell electrode lay-out figure of preparation in the embodiment of the present invention 3, and wherein 8 is line stretcher;
Fig. 4 is the MWT solar cell welding schematic diagram prepared in embodiment of the present invention 1-3;
Fig. 5 be the welding prepared in embodiment of the present invention 1-3 at MWT rear surface of solar cell electrode welding method schematic diagram, wherein 9,10,11 are respectively scolding tin, welding contacts with backplate (emitter or base stage);
Fig. 6 A is the MWT rear surface of solar cell electrode insulation Regional Distribution schematic diagram of preparation in the embodiment of the present invention 2, and wherein 12 is insulation films;
Fig. 6 B is the MWT rear surface of solar cell electrode insulation Regional Distribution schematic diagram of preparation in the embodiment of the present invention 3, and wherein 12 is insulation films;
Fig. 7 A is the adjacent two panels MWT solar cell connection diagram prepared in embodiment of the present invention 1-3;
Fig. 7 B is the connection diagram of the MWT solar cell series winding cell piece prepared in embodiment of the present invention 1-3.
Embodiment
Below in conjunction with specific embodiment, the present invention is described further, but protection scope of the present invention is not limited in this.
Embodiment 1
The preparation method of the MWT solar module that the present embodiment provides, containing following steps:
A, prepare back contacts MWT solar cell, use p-type crystalline silicon matrix, carry out phosphorus diffusion; Penetrate film at the another side deposition passivated reflection reducing of crystalline silicon matrix and form sensitive surface; Laser is utilized to make conductive through hole on crystalline silicon matrix; Silk screen printing is used conductive silver paste to be filled up conductive through hole formation asymmetric emitter (negative pole) contact electrode as shown in Figure 3A; Burnishing surface use silk screen printing aluminium paste form base stage contact electrode; At sensitive surface printing silver contact grid line, and be connected with conductive through hole;
B, can be the circle of diameter 1-7mm or square for length of side 1mm-7mm in use silk screen printing to be filled up by conductive silver paste shape that conductive through hole forms cathode contact electrode, be circular in the present embodiment, negative electricity is four (4) row very, the wherein spacing of row and row, and distance between the edge of first row and the 4th row battery is all equal.Each row negative electrode has the contact point that four (4) individual spacing are equal, forms 4x4 array.Positive electricity is three (3) row very, and insert between negative electrode array in uniform parallel, the distance both often between row positive electrode with adjacent negative electrode is equal.Each row positive electrode can have the contact point that five (5) individual spacing are equal, and form 5x3 array positive electrode, the shape of last contact point of each negative electrode array is different from other contact point, is an extension oblique line;
Adopt after C, printing and dry high temperature sintering, sintering temperature, at 500-900 DEG C, forms metal and silicon substrate ohmic contact through sintering, completes the making of MWT solar cell;
D, for ensureing the insulation of MWT solar cell in establishment of component process between positive and negative electrode, MWT battery make complete after the printing one all negative pole peripheral regions of layer insulating slurry clad battery, only negative pole is exposed;
E, utilize low temperature drying after around battery cathode, form insulating layer region, low temperature drying temperature is 100-300 DEG C, and drying time is 0.5-5 minute;
F, on welding according to MWT solar cell positive and negative electrode contact point arrangement size punching (as shown in Figure 4), porose welding and respective electrode contact alignment are positioned over MWT solar cell back, then scolding tin are injected as shown in Figure 5 one by one the connection of welding hole formation welding and each electrode contact point;
G, according to the method for attachment shown in Fig. 7 A, 7B, welding that MWT solar cell is connected one by one;
H, according to glass, EVA, series welding cell piece, EVA and back veneer material order arrangement and through lamination, solidification, be packaged into battery component.Wherein EVA is vinyl-vinyl acetate copolymer, and it is formed by ethene and vinyl acetate copolymerization, and English name is EthyleneVinylAcetate, is called for short EVA, lower same;
In the present embodiment, welding used and welding procedure are in current volume production line and use, and can use manual welding, also can use automatic welding when scolding tin injects, and do not need to introduce new engine, new raw material, and all processing procedures can produce on line in current industrialization and complete.
Embodiment 2
The preparation method of the MWT solar module that the present embodiment provides, containing following steps:
A, prepare back contacts MWT solar cell, use p-type crystalline silicon matrix, carry out phosphorus diffusion; Penetrate film at the another side deposition passivated reflection reducing of crystalline silicon matrix and form sensitive surface; Laser is utilized to make conductive through hole on crystalline silicon matrix; Silk screen printing is used conductive silver paste to be filled up conductive through hole formation asymmetric emitter (negative pole) contact electrode as shown in Figure 3 B; Burnishing surface use silk screen printing aluminium paste form base stage contact electrode; At sensitive surface printing silver contact grid line, and be connected with conductive through hole;
B, can be the circle of diameter 1-7mm or square for length of side 1mm-7mm in use silk screen printing to be filled up by conductive silver paste shape that conductive through hole forms cathode contact electrode, negative electricity is four (4) row very, wherein row and the spacing arranged, and distance between the edge of first row and the 4th row battery is all equal, each row negative electrode has the contact point that four (4) individual spacing are equal, form 4x4 array, positive electricity is three (3) row very, insert between negative electrode array in uniform parallel, the distance both often between row positive electrode with adjacent negative electrode is equal.Each row positive electrode can have the contact point that five (5) individual spacing are equal, forms 5x3 array positive electrode.The shape of last contact point of each negative electrode array is different from other contact point, is a L-type line stretcher;
C, for ensureing the insulation of MWT solar cell in establishment of component process between positive and negative electrode, after the complete silk screen printing aluminium paste in the MWT battery back side is dried, republish one deck all negative pole peripheral regions of insulating barrier slurry clad battery as shown in Figure 6A, only negative pole is exposed;
Adopt after D, printing and dry high temperature sintering, sintering temperature, at 500-900 DEG C, forms metal and silicon substrate ohmic contact through sintering, completes the making of MWT solar cell;
E, on welding according to MWT solar cell positive and negative electrode contact point arrangement size punching (as shown in Figure 4), porose welding and respective electrode contact alignment are positioned over MWT solar cell back, then scolding tin are injected as shown in Figure 5 one by one the connection of welding hole formation welding and each electrode contact point;
F, according to the method for attachment shown in Fig. 7 A, 7B, welding that MWT solar cell is connected one by one;
G, according to glass, EVA, series welding cell piece, EVA and back veneer material order arrangement and through lamination, solidification, be packaged into battery component.
Embodiment 3
The preparation method of the MWT solar module that the present embodiment provides, containing following steps:
A, prepare back contacts MWT solar cell, use p-type crystalline silicon matrix, carry out phosphorus diffusion; Penetrate film at the another side deposition passivated reflection reducing of crystalline silicon matrix and form sensitive surface; Laser is utilized to make conductive through hole on crystalline silicon matrix; Silk screen printing is used conductive silver paste to be filled up conductive through hole formation asymmetric emitter (negative pole) contact electrode as shown in Figure 3 C; Burnishing surface use silk screen printing aluminium paste form base stage contact electrode; At sensitive surface printing silver contact grid line, and be connected with conductive through hole;
B, can be the circle of diameter 1-7mm or square for length of side 1mm-7mm in use silk screen printing to be filled up by conductive silver paste shape that conductive through hole forms cathode contact electrode.Negative electricity is four (4) row very.The wherein spacing of row and row, and distance between the edge of first row and the 4th row battery is all equal.Each row negative electrode has the contact point that four (4) individual spacing are equal, forms 4x4 array.Positive electricity is three (3) row very, and insert between negative electrode array in uniform parallel, the distance both often between row positive electrode with adjacent negative electrode is equal.Each row positive electrode can have the contact point that four (4) individual spacing are equal, forms 4x3 array positive electrode.Distribution negative electrode array identical of electrode contact point in these positive electrode arrays.The shape of last contact point of each negative electrode array is different from other contact point, is an extension straight line;
Adopt after C, printing and dry high temperature sintering, sintering temperature, at 500-900 DEG C, forms metal and silicon substrate ohmic contact through sintering, completes the making of MWT solar cell;
D, for ensureing the insulation of MWT solar cell in establishment of component process between positive and negative electrode, MWT battery make complete after printing one deck all negative pole peripheral regions of insulating barrier slurry clad battery as shown in Figure 6B, only negative pole is exposed;
E, utilize low temperature drying after around battery cathode, form insulating layer region.Low temperature drying temperature is 100-300 DEG C, and drying time is 0.5-5 minute;
F, on welding according to MWT solar cell positive and negative electrode contact point arrangement size punching (as shown in Figure 4).Porose welding and respective electrode contact alignment are positioned over MWT solar cell back, then scolding tin are injected as shown in Figure 5 one by one the connection of welding hole formation welding and each electrode contact point;
G, according to the method for attachment shown in Fig. 7 A, 7B, welding that MWT solar cell is connected one by one;
F, according to glass, EVA, series welding cell piece, EVA and back veneer material order arrangement and through lamination, solidification, be packaged into battery component.
Above-described embodiment is the present invention's preferably execution mode; but embodiments of the present invention are not restricted to the described embodiments; change, the modification done under other any does not deviate from Spirit Essence of the present invention and principle, substitute, combine, simplify; all should be the substitute mode of equivalence, be included in protection scope of the present invention.
Claims (8)
1. a preparation method for MWT solar module, is characterized in that containing following steps:
(1) at the both positive and negative polarity contact electrode of MWT back of solar cell printing asymmetric distribution, wherein positive contact electrode is made up of the positive electrode contact point in (N+1) × (N-1) or N × (N-1) array arrangement, cathode contact electrode is made up of the negative electrode contact point in N × N array arrangement, and each row positive electrode contact point and negative electrode contact point distribute alternately;
(2) last negative electrode contact point of described often row negative electrode contact point has line stretcher, and described line stretcher ends at but discontiguous position mutually concordant with last positive electrode contact point of adjacent column;
(3) after both positive and negative polarity contact electrode being sintered, the positive and negative contact electrode of each row arranges welding respectively, described welding is provided with the hole corresponding with positive and negative electrode contact point, realizes welding be connected with each contact point of positive and negative contact electrode by injecting scolding tin in hole;
(4) adopt welding to carry out welding the series connection realizing adjacent MWT solar cell, form series welding cell piece;
(5) following assembly is also formed MWT solar module through containing lamination, solidification and packaging process process according to the order arrangement of glass, EVA, series welding cell piece, EVA and back veneer material;
The shape of line stretcher described in step (2) is straight line, oblique line, L shape line style or curve;
When the shape of described line stretcher is straight line, the angle of described straight line and cathode contact electrode is 90 °, and when the shape of described line stretcher is oblique line, the angle of described oblique line and cathode contact electrode is 45 ° ~ 90 °.
2. the preparation method of MWT solar module according to claim 1, it is characterized in that: in step (1), positive contact electrode is made up of the positive electrode contact point in 5 × 3 or 4 × 3 array arrangements, cathode contact electrode is made up of the negative electrode contact point in 4 × 4 array arrangements.
3. the preparation method of MWT solar module according to claim 1, is characterized in that: in step (1), each row positive electrode contact point spacing is identical, and the spacing of each row negative electrode contact point is also identical; Spacing between each row positive electrode contact point is identical, and the spacing between each row negative electrode contact point is also identical.
4. the preparation method of MWT solar module according to claim 1, is characterized in that: in step (1), first row is also identical with the distance between last row negative electrode contact point with MWT solar cell piece edge.
5. the preparation method of MWT solar module according to claim 1, is characterized in that: the shape of positive and negative electrode contact point described in step (1) is for circular or square, and diameter or the square length of side size of described circle are 1mm ~ 7mm.
6. the preparation method of MWT solar module according to claim 1, it is characterized in that: after both positive and negative polarity contact electrode being sintered in step (3), at cathode contact printed on electrodes insulation paste, drying process makes to insulate between positive and negative contact electrode; Or before both positive and negative polarity contact electrode is sintered, insulation paste is printed on cathode contact electrode, makes to insulate between positive and negative contact electrode through sintering.
7. the preparation method of MWT solar module according to claim 1, is characterized in that: described in step (3), the minimum straight warp in hole is 0.05mm, maximum straight through being no more than the size of positive and negative electrode contact point.
8. the preparation method of MWT solar module according to claim 1, it is characterized in that: described in step (3) and (4), the width of welding is 1.5 ~ 10.0mm, thickness is not less than 0.10mm, and length is not more than the length of side of MWT solar cell.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103236461B (en) | 2013-04-03 | 2016-05-25 | 友达光电股份有限公司 | Photoelectric conversion module |
| CN203423193U (en) * | 2013-07-08 | 2014-02-05 | 南京日托光伏科技有限公司 | MWT solar cell |
| CN103456843A (en) * | 2013-09-17 | 2013-12-18 | 连云港神舟新能源有限公司 | Method for manufacturing back contact type crystalline silicon solar cell component |
| CN103730521A (en) * | 2013-12-27 | 2014-04-16 | 晶澳（扬州）太阳能科技有限公司 | MWT solar cell, MWT solar cell component and manufacturing method of MWT solar cell component |
| NL2012557B1 (en) * | 2014-04-02 | 2016-02-15 | Stichting Energieonderzoek Centrum Nederland | Photovoltaic module. |
| CN104282788B (en) * | 2014-09-28 | 2017-03-22 | 苏州中来光伏新材股份有限公司 | Main-grid-free high-efficiency back contact solar cell module, main-grid-free high-efficiency back contact solar cell assembly and manufacturing technology of main-grid-free high-efficiency back contact solar cell assembly |
| CN107437572A (en) * | 2017-06-26 | 2017-12-05 | 南通华隆微电子股份有限公司 | A kind of method for manufacturing the semiconductor package with projection cube structure |
| CN107437569B (en) * | 2017-06-26 | 2021-01-19 | 南通华隆微电子股份有限公司 | Manufacturing method of semiconductor packaging structure with sealing points |
| CN107492577A (en) * | 2017-06-26 | 2017-12-19 | 南通华隆微电子股份有限公司 | A kind of semiconductor package with projection cube structure |
| CN107968129A (en) * | 2017-12-21 | 2018-04-27 | 君泰创新（北京）科技有限公司 | Photovoltaic cell processing technology and photovoltaic cell string weldering solidification equipment |
| CN108365043B (en) * | 2018-04-24 | 2023-09-22 | 通威太阳能（合肥）有限公司 | Interconnection structure of photovoltaic cell piece subassembly |
| CN108878545B (en) * | 2018-05-29 | 2020-03-10 | 江苏日托光伏科技股份有限公司 | MWT battery capable of reducing arrangement of positive electrode points and preparation method |
| CN111599834B (en) * | 2020-05-29 | 2022-07-12 | 京东方科技集团股份有限公司 | Display substrate and preparation method thereof |
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| US20100018565A1 (en) * | 2007-01-25 | 2010-01-28 | Yasushi Funakoshi | Solar cell, solar cell array and solar cell module, and method of fabricating solar cell array |
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