CN102637769A - Silicon-based thin-film solar cell packaging method - Google Patents
Silicon-based thin-film solar cell packaging method Download PDFInfo
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- CN102637769A CN102637769A CN2012100715452A CN201210071545A CN102637769A CN 102637769 A CN102637769 A CN 102637769A CN 2012100715452 A CN2012100715452 A CN 2012100715452A CN 201210071545 A CN201210071545 A CN 201210071545A CN 102637769 A CN102637769 A CN 102637769A
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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
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Abstract
The invention provides a silicon-based thin-film solar cell packaging method. A silicon-based thin-film solar cell comprises a front panel cell, a back plate, a packaging structure between the front panel cell and the back plate, and a sealing structure outside the packaging structure. The method is characterized by including the steps: cutting the packaging structure; arranging the cut packaging structure onto the front panel cell; applying melted strip sealing structure onto the front panel cell along the edge of the packaging structure through a gluing system; arranging the back plate onto a silicon-based thin-film solar cell module after gluing; and completing packaging of the silicon-based thin-film solar cell by a double-cavity two-step lamination method. Using the lamination packaging method for the silicon-based thin-film solar cell to be protected can greatly improve performance and reliability of the thin-film cell and the module thereof, production frequency is increased, and production line yield is improved.
Description
Technical field
The present invention relates to the encapsulation field of solar cell, more specifically, relate to the method that a kind of two step of the EVA+Edge-seal of employing two-chamber laminating technology is realized the encapsulation of silicon-based film solar cells.
Background technology
At present, in the thin-film solar cells packaging technology, the laminated glass mode is more, and encapsulating material is main with PVB, EVA, but the PVB cost is higher, and quality the PVB that uses of photovoltaic industry is mainly by international vendor production preferably, and price is higher.The PVB of domestic production mainly is used in building trade, also have part manufacturer to begin to produce the PVB that the photovoltaic industry is used, but the long-term reliability in environment is still to be tested.
EVA also has use widely in the hull cell encapsulation, and existing long historical, but along with the raising to battery life, reliability requirement; EVA the problem of component failures occurs easily when harsher reliability testing, test result is referring to the table 1 shown in Fig. 6 a; The part manufacturer also assembly after using lamination carries out silica gel edge sealing (as shown in Figure 5); Silica gel etc. is coated doing the usefulness of waterproof in assembly edge behind lamination, but actual effect is not good, and test result is seen the table 2 shown in Fig. 6 b.Silica gel needs about 12 hours curing time, and to production efficiency, the pressure that cause in the place is big, and the silica gel sealing glue consumption is more around the assembly, and the supplies consumption cost is high, and silica gel hangs easily in handling process, is difficult to play a protective role.
Summary of the invention
In order to overcome above-mentioned inherent shortcoming of the prior art; The present invention proposes a kind of method for packing of silicon-based film solar cells; Said silicon-based film solar cells is by header board battery sheet, backboard, and the hermetically-sealed construction in the encapsulating structure between said header board battery sheet and the said backboard and the encapsulating structure outside is formed; It is characterized in that this method may further comprise the steps:
Said encapsulating structure is cut;
Said encapsulating structure after cutting is configured on the said header board battery sheet;
Through coating system, the edge of the said encapsulating structure in edge is coated to the strip hermetically-sealed construction that melts on the said header board battery sheet;
Said backboard is configured on the silicon-based film solar cells assembly behind the gluing;
Use two step of two-chamber laminating method to accomplish the encapsulation of said silicon-based film solar cells.
According to a preferred embodiment of the present invention, form the configuration of said encapsulating structure and the coating of said hermetically-sealed construction in the method for packing of described silicon-based film solar cells simultaneously.
According to another preferred embodiment of the present invention; There are three kinds of processing modes in four jiaos of lap-joints on coated said strip hermetically-sealed construction of coating system described in the method for packing of described silicon-based film solar cells and the said header board battery sheet; It is the fillet processing mode; Overlapping processing mode, processing mode at interval.
According to a further advantageous embodiment of the invention, laminating method comprises lamination step and silicon-based film solar cells assembly edge overvoltage protection step the two-chamber described in the method for packing of described silicon-based film solar cells two step.
According to a further preferred embodiment of the invention, the lamination step described in the method for packing of described silicon-based film solar cells is divided into two steps, i.e. precompressed process steps and encapsulating structure curing schedule.
According to another preferred embodiment of the present invention, the employed material of the encapsulating structure described in the method for packing of described silicon-based film solar cells is EVA or PVB.
According to another preferred embodiment of the present invention, hermetically-sealed construction described in the method for packing of described silicon-based film solar cells is the hot melt butyl rubber.
According to a further advantageous embodiment of the invention, the coating width of the coated said strip hermetically-sealed construction of coating system described in the method for packing of described silicon-based film solar cells is with the increase of design service time of said silicon-based film solar cells and broadening.
According to another preferred embodiment of the present invention, the fillet processing mode described in the method for packing of described silicon-based film solar cells is that said strip hermetically-sealed construction is handled at four jiaos of employing circular arcs of said header board battery sheet.
According to another preferred embodiment of the present invention, the method for packing of described silicon-based film solar cells, wherein said overlapping processing mode is that said strip hermetically-sealed construction is superimposed at the Si Jiaochu of said header board battery sheet.
According to a further advantageous embodiment of the invention; The method for packing of described silicon-based film solar cells, wherein said interval processing mode are that mutually perpendicular two said strip hermetically-sealed constructions have the gap less than 1mm between four jiaos of places of said header board battery sheet are mutual.
According to another preferred embodiment of the present invention; Precompressed process steps described in the method for packing of described silicon-based film solar cells is accomplished through first laminated resonator of two step of two-chamber laminater; Make said encapsulating structure and said header board battery sheet and the bonding typing of said backboard, and the gas between said header board battery sheet and said backboard and the said encapsulating structure is extracted out.
According to another preferred embodiment of the present invention; Encapsulating structure curing schedule described in the method for packing of described silicon-based film solar cells is accomplished through second laminated resonator of described two step of two-chamber laminater, makes said encapsulating material EVA that cross-linking reaction fully take place.
According to a further advantageous embodiment of the invention, the assembly edge overvoltage protection step described in the method for packing of described silicon-based film solar cells is to place bearer bar in the said silicon-based film solar cells assembly outside of treating lamination.
Above-mentioned method for packing has proposed to encapsulate as the edge seal material cooperation EVA encapsulating material of film battery assembly with butyl hot melt adhesive (hereinafter to be referred as butyl rubber) scheme of said battery component; It is the EVA+Edge-seal scheme; And the main feature of described EVA+Edge-seal technology is: the reliability of assembly significantly improves, the table 3 shown in DH1000, wet leakage tests data such as Fig. 6 c.After 1320 hours, playing the sign that wet electric leakage has no decline through damp and hot test Damp Heat.And above-mentioned EVA+Edge-seal technology is aspect operating efficiency: the EVA+edge-seal automation technolo is produced and other specific efficiency indifference distances mutually, and present industry level can make productive temp reach 25 seconds, and efficient is high.Simultaneously, butyl rubber belongs to more recent technology in field of solar energy.But along with the raising of reliability of products such as solar cell requirement and the decline of following automatic double surface gluer and colloid cost, the EVA+Edge-seal scheme will be widely used in silica gel thin film solar cell industry.Therefore the above-mentioned method for packing of the present invention's proposition can improve the performance and the reliability of silicon-based film solar cells and assembly thereof greatly, also has good market prospects simultaneously.
Description of drawings
Through reading the detailed description of doing with reference to following accompanying drawing that non-limiting example is done, it is more obvious that other features, objects and advantages of the present invention will become, wherein:
Fig. 1 is the flow chart of the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention.
Fig. 2 is the processing route figure of two step of the two-chamber laminating method of the EVA+Edge-seal described in the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention.
Fig. 3 is the process flow diagram of two step of the two-chamber laminating method of the EVA+Edge-seal described in the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention.
Fig. 4 is concrete manufacturing process requirement and a technical essential sketch map in the technological process of two step of two-chamber laminating method of the EVA+Edge-seal described in the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention, comprising Fig. 4-1 to Fig. 4-10.
Fig. 5 is existing film battery assembly carries out the silica gel edge sealing behind lamination a sketch map.
Fig. 6 is the chart of the test result and the related data of battery component, and wherein Fig. 6 a is an EVA Damp Heat test result sketch map, is illustrated as table 1; Fig. 6 b is the edge-protected EVA packaging film assembly DH test result of silica gel, is illustrated as table 2; Fig. 6 c is the DH1000 described in the EVA+Edge-seal technology, wet leakage tests schematic diagram data, is illustrated as table 3.
Fig. 7 is the performance parameter hoist pennants of Kommerling PVS101.
Fig. 8 is the wet leakage tests of EVA package assembling and EVA+Edge-seal project components Damp Hea1000h (DH1000) back sketch map as a result.
Fig. 9 is the sketch map that two-chamber two goes on foot the typical processing range of the encapsulating material of testing in the laminating technology.
Same or analogous Reference numeral is represented same or analogous parts in the accompanying drawing.
Embodiment
In order to understand better and to explain the present invention, will make further detailed description with reference to Fig. 1-9 couple the present invention below.
In order to understand the present invention better, at first, simultaneously traditional EVA encapsulation technology and EVA+Edge-seal encapsulation technology are compared explanation to the technical term that occurs among the present invention explanation that makes an explanation.
At first; Reaction type hot-fusible butyl sealant (hot-melt butyl; Be designated hereinafter simply as butyl rubber) have good vapour resistance can, with good cementability and the anti-environmental aging performance of material such as glass; In novel double glazing and CIGS, the encapsulation of CdTe hull cell, be widely used, and aspect crystal silicon solar batteries, existing Related product is showed; Simultaneously; Aspect silicon-based film solar cells; With the scheme of butyl rubber as assembly edge seal material cooperation EVA encapsulating material package assembling, promptly the EVA+Edge-seal scheme can be improved because EVA material water preventing ability is relatively poor greatly; Cause problems such as assembly reliability difference, be one of trend of following component package scheme.And the present invention adopts the EVA+Edge-seal scheme of butyl rubber edge sealing and the two-chamber lamination packaging technology in silicon-based film solar cells thereof, realizes the encapsulation of silicon-based film solar cells.And the butyl rubber that the present invention adopts mainly is German Kommerling PVS101, U.S. Truseal LP02, LP03.Butyl rubber mainly is to form the primary structure unit of butyl rubber by isobutene and a small amount of isoprene copolymer:
The mutual winding of butyl rubber polymer molecule interchain is strong, and the space is little, and steam etc. extremely difficulty pass through, and makes it have good water vapor rejection performance, the about 0.01g/m of its MVTR
2* day (EN 1279.4) and through adding various auxiliary materials makes it have good anti-ultraviolet ageing performance, higher volume resistance, the adhesive property good with glass.Above data can be referring to the performance parameter table of the Kommerling PVS101 shown in Fig. 7.
Hot-melt (hot melt) scheme of the butyl rubber in the Edge-seal technology that the present invention in addition, adopted more has superiority than Tape scheme.Particularly, at present, butyl rubber mainly is used in the thin-film solar cells of CIGS, CdTe type in solar energy market; Its operational version has two kinds, is respectively Hot-melt scheme and Tape scheme, and the Hot-melt scheme adopts automatic double surface gluer; The PUR of barreled is melted the back through accurately control; Be coated in the edge of thin-film solar cells header board uniformly, carry out the lamination encapsulation with EVA and backboard then, colloid plays the insulated enclosure effect in the assembly edge.The Tape scheme is for passing through tape equipment with the barreled colloid earlier; Its form that is processed as adhesive tape is sold to solar energy manufacturer; Solar energy manufacturer places it in the edge of thin-film solar cells with adhesive tape through tape equipment or manual type then, carries out the lamination encapsulation with EVA then.Tape scheme technology maturation wherein, occupation rate of market is higher, occupies an leading position.The Hot-melt scheme is to begin to get into the solar energy industry in nearly 2 years, because equipment and technology is had relatively high expectations, initially has high input, and be widely used as yet, but it has lot of advantages.
Advantage one, cost advantage, Hot-melt scheme colloid is a barreled glue, compares the Tape scheme, need not follow-up reprocessing, cost is than low 30% (the deciding according to market conditions) of Tape scheme, and is with the obvious advantage.
Advantage two, production loss are little, and Hot-melt adopts automatic double surface gluer directly colloid to be melted, and is coated in the thin film solar cell sheet marginal position then, the control able to programme of whole process, and the colloid waste is few.But the Tape scheme can produce certain influence each when changing adhesive tape, and especially can waste during manual work can be bigger, and influence yield.
Advantage is deposited in advantage three, transportation, and butyl rubber is high to environmental requirement, must adopt to pack, and the normally many volumes of Tape are placed in the container, need take the special seal measure to it after opening.But the Hot-melt scheme need not to consider this problem, and after the barreled colloid was installed on the equipment, equipment self had good seal performance, need not other seal approach.
At last, EVA+Edge-seal assembly of the present invention is higher than EVA package assembling reliability.Particularly, EVA is that ethylene-vinyl acetate copolymer is called for short, and general vinyl acetate (VA) content is 5%～40%.Compare with polyethylene; EVA is owing to introduced VAM in strand; Thereby reduced high-crystallinity; Pliability, impact resistance, filler intermiscibility and heat seal performance have been improved, fields such as the footwear material that is widely used in foaming, functional canopy film, packaging film, PUR, electric wire and toy.EVA is to be one of main solar energy encapsulating material at present, is widely used in the crystal silicon assembly, in the film assembly encapsulation, but because the EVA material behavior, relatively poor to the barrier property of steam, hydrone gets into assembly easily, reduces assembly reliability.Table 4 shown in Fig. 8 is EVA package assembling and the wet leakage tests result in EVA+Edge-seal project components Damp Hea1000h (DH1000) back.Test assembly size: 410mm*410mm; Encapsulating material First F806; Edge-seal material Kommerling PVS 101; Tester is the Nanjing long CS9922A of a Sheng dielectric voltage withstand tester, and according to the IEC61646 standard, resistance should be greater than 238M Ω during its wet test leakage examination of assembly behind DH1000 for this specification assembly.
The assembly that can find out independent use EVA material package from test data is after DH1000 hour, and the wet test leakage examination of assembly is not all passed through, but adopts the assembly resistance of EVA+Edge-seal sealing not have decline basically, and insulation property are good.
Through explanation and the related process and the encapsulation technology contrast of above parameter and concrete term, can find out that EVA+Edge-seal has stronger technical advantage and better development trend with respect to simple EVA.
Fig. 1 is the flow chart of the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention.At first; Said silicon-based film solar cells is traditional silicon-based film solar cells, promptly by header board battery sheet, backboard; And the hermetically-sealed construction composition in the encapsulating structure between said header board battery sheet and the said backboard and the encapsulating structure outside, therefore also not shown in the drawings.As shown in Figure 1, at step S101, said encapsulating structure is cut;
Then, step proceeds to S102, and the said encapsulating structure after cutting is configured on the said header board battery sheet;
Then, execution in step S103, through coating system, the edge of the said encapsulating structure in edge is coated to the strip hermetically-sealed construction that melts on the said header board battery sheet;
Then, step proceeds to S104, and said backboard is configured on the silicon-based film solar cells assembly behind the gluing;
At last, step proceeds to S105, uses two step of two-chamber laminating method to accomplish the encapsulation of said silicon-based film solar cells.
Preferably, in the encapsulation process of reality, can change the order of coating of configuration and the said hermetically-sealed construction of said encapsulating structure, promptly step S102 and step S103 can be on technology the replacing order.
More preferably, wherein there are three kinds of processing modes in four jiaos of lap-joints on coated said strip hermetically-sealed construction of the coating system described in the step S103 and said header board battery sheet, i.e. fillet processing mode, overlapping processing mode, processing mode at interval.Particularly, said fillet processing mode is that said strip hermetically-sealed construction is handled at four jiaos of employing circular arcs of said header board battery sheet; Said overlapping processing mode is that said strip hermetically-sealed construction is superimposed at the Si Jiaochu of said header board battery sheet; Said interval processing mode is that mutually perpendicular two said strip hermetically-sealed constructions have the gap less than 1mm between four jiaos of places of said header board battery sheet are mutual.
In addition, preferably, in step S105, described two step of two-chamber laminating method comprises lamination step and silicon-based film solar cells assembly edge overvoltage protection step.Particularly; Described lamination step is divided into two steps; Be precompressed process steps and encapsulating structure curing schedule, more specifically, described precompressed process steps is accomplished through first laminated resonator of two step of two-chamber laminater; Make said encapsulating structure and said header board battery sheet and the bonding typing of said backboard, and the gas between said header board battery sheet and said backboard and the said encapsulating structure is extracted out; Described encapsulating structure curing schedule is accomplished through second laminated resonator of described two step of two-chamber laminater, makes said encapsulating structure that cross-linking reaction fully take place; Described assembly edge overvoltage protection step is to place bearer bar in the said silicon-based film solar cells assembly outside of treating lamination.
More preferably, the employed material of wherein said encapsulating structure can be EVA or PVB.And said hermetically-sealed construction can be the hot melt butyl rubber.
In addition; The coating width of the coated said strip hermetically-sealed construction of said coating system is with the increase of design service time of said silicon-based film solar cells and broadening; Can guarantee silicon-based film solar cells like this in the stability that designs the battery performance in service time, and improve the performance of the anti-environmental aging of battery.
Fig. 2 is the processing route figure of two step of the two-chamber laminating method of the EVA+Edge-seal described in the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention.Fig. 3 is the process flow diagram of two step of the two-chamber laminating method of the EVA+Edge-seal described in the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention.As shown in Figure 2, the processing route () and the processing route (two) of the two-chamber two step laminating method of EVA+Edge-seal have been shown among the figure, wherein processing route () comprises 1, EVA cuts and lay; 2, the hot melt butyl rubber applies; 3, backboard closes sheet; 4, two step of two-chamber lamination; And processing route (two) comprises 1, the hot melt butyl rubber applies; 2, EVA cuts and lays; 3, backboard closes sheet; 4, two step of two-chamber lamination.Technology (one) and technology (two) is main change be that EVA cuts, the exchange of laying and hot melt butyl rubber, two kinds of technology modes all can be operated, and the assembly property that encapsulates is not had influence.And the process flow diagram of two step of the two-chamber laminating method that adopts EVA+Edge-seal has been shown among Fig. 3 in encapsulation process, employing be above-mentioned processing route ().And can repeat no more at this referring to Fig. 4 for the manufacture craft in each the concrete step in the above-mentioned processing route and requirements of making and technical essential.
Fig. 4 is concrete manufacturing process requirement and a technical essential sketch map in the technological process of two step of two-chamber laminating method of the EVA+Edge-seal described in the method for packing of said silicon-based film solar cells according to a preferred embodiment of the present invention, comprising Fig. 4-1 to Fig. 4-10.As shown in Figure 4, we are according to the explanation that makes an explanation respectively of four steps in the whole process flow, so that understand the present invention better.
The first, EVA cuts and lays
At first, shown in Fig. 4-1, EVA cuts and lays and is about to the EVA glued membrane and is cut into the certain specification size as requested and it is laid on the header board hull cell sheet.Be the key factor of this handicraft product yield, the inaccuracy that cuts and the position deviation of laying too big city influence packaging effect.Preferably, this technological requirement EVA cut precision be controlled at ± 0.5mm in, lay required precision and also be ± 0.5mm in.
The second, the hot melt butyl rubber applies
Through the coating system of precision, the hot melt butyl rubber that melts is coated to the sealing area of battery sheet edge designs, play sealing function after the lamination encapsulation, like Fig. 4-2.
In described coating procedure, mainly comprise following four aspects:
1. the thickness (Thickness) of the adhesive tape that is coated with.Preferably, adhesive tape thickness is about on the basis of the EVA material thickness that adopts generally speaking increases by 0.1～0.15mm, i.e. T (butyl ribbon)=T (EVA)+0.1～0.15mm.But must guarantee that the adhesive tape thickness behind the lamination can be greater than 0.3mm, like Fig. 4-3.
2. the width of the adhesive tape that is coated with.Preferably, can be according to colloid MVTR and adhesive tape water vapor permeable curve and product design reliability performance index, wait the width of selecting to be coated with adhesive tape like Damp Heat test (referring to the IEC 61646) time.Generally speaking, selecting coating width is the adhesive tape of 10mm, can through the longer Damp Heat testing time, then need consider to increase the adhesive tape width, like Fig. 4-3 like need through Damp Heat test in 3000 hours.
3. the position of adhesive tape on the hull cell plate.Preferably, the adhesive tape outer side edges of coating is apart from the about 0-1mm of distance of glass edge, and this distance has relation with laminating technology.The adhesive tape adhesive tape that applies generally is about 0.5-2mm apart from the distance at the EVA edge of laying, and this distance is relevant with the heat-shrinkable of laminating technology and EVA.When producing, can do according to actual needs slightly and transfer.
4. adhesive tape is in the processing of four jiaos of lap-joints.Preferably, three kinds of modes are arranged generally speaking, (1) fillet type, promptly adhesive tape adopts circular arc to handle at four jiaos of places of glass.Like sketch map 4-4.(2) overlapping type, promptly adhesive tape is carried out necessarily superimposed at Si Jiaochu.Like sketch map 4-5.(3) cabinet-type, promptly adhesive tape is reserved the gap at Si Jiaochu, preferably, said gap＜1mm.Like sketch map 4-6 and sketch map 4-7.
5. environment temperature, humidity management and control and operating time management and control, preferably, above-mentioned parameter is as follows:
Temperature: 25 ± 2 ℃ of humidity RH 50 ± 10%
Adhesive tape is open-assembly time in environment :≤30 minutes
EVA need use up at the appointed time, is generally less than 24 hours.
The 3rd, backboard closes sheet
Preferably, said backboard is generally glass, therefore generally speaking clean back-panel glass accurately is placed on the semi-finished product assembly of accomplishing above-mentioned technology (to comprise that lead-in wire passes the hole on the backboard), accomplishes back-panel glass and closes sheet.Preferably, with reference to closing sheet precision: ± 0.5mm.Generally, battery production manufacturer can decide according to the product quality testing standard of oneself.Like Fig. 4-8.
The 4th, two step of two-chamber laminating technology
Present domestic use laminating machine comparatively widely for enhancing productivity, reduces the lamination pitch time for single chamber laminating machine; Design the bicavate laminating machine, originally one step completed lamination in a chamber was placed on two steps completion in two chambeies; First chamber is as precompressed; Transfer to two chambeies afterwards and be cured, precompressed is carried out in first chamber charging once more, makes its theoretical efficiency improve about 1 times.In addition, to Edge-seal scheme proposed by the invention, traditional single chamber laminating technology temperature is higher, and the distortion of glass in the chamber is big; And the hot melt butyl rubber can fast softening and and glass cementation, influence lamination, seek out good effect; Need to have Pin on the laminating machine hot plate, make it treat that laminated compenent gets into laminating machine after, Pin rises; To wait to press assembly jack-up, make its even heating, and gas taken out before bonding fully with glass in that colloid is softening.Mostly this type of single chamber laminating machine is external production at present, and price is higher.The two-chamber laminating machine can effectively improve the drawback of single chamber laminating machine, in different chambeies parameters such as different temperature is set, and different cavity performance different effects is improved or avoided because the softening bad problem of lamination that causes of glass temperature distortion and hot melt butyl rubber.The at present domestic existing how tame manufacturer of two-chamber laminating machine is producing, and single chamber laminating machine that price has the Pin function is low, and its efficient is higher than single chamber laminating machine, and is with the obvious advantage.The two-chamber laminating technology generally includes following two parts:
One, assembly edge overvoltage protection
In the lamination process, the pressure that the assembly edge receives is different with other zones, and can cause assembly limit glass to take place than macrobending one is the edge overpressure problems.This problem can cause colloid spillover and assembly colloid and glass generation segregation phenomenon when using behind the lamination in the future; The former can influence the outward appearance of assembly; Increase extra treatment process, the latter can reduce the effect of the obstruct vapour molecule entering of assembly, influences the reliability of assembly.Overvoltage phenomenon such as Fig. 4-9.This problem can be solved through placing bearer bar in the assembly outside of treating lamination.Preferably, the thickness of bearer bar because of with the consistency of thickness that the overvoltage assembly does not take place or bigger 10%, width generally is about 20-25mm, can be according to actual effect optimization.Bearer bar apart from the spacing of assembly be the 0.5-1cm effect.Like Fig. 4-10.
Two, two step of two-chamber laminating technology (combining Edge-seal)
First step precompressed process, this step is accomplished in first chamber of laminating machine, mainly makes EVA and glass that bonding typing takes place, and the gas that exists between glass and the EVA is extracted out.Since butyl rubber softening with glass cementation after, gas just is difficult to discharge, so need to prolong the time that butyl rubber softens, prolongs the pumpdown time simultaneously, to discharge gas as far as possible, prevents the appearance of bubble behind the lamination.And to consider the situation and the equipment effective rate of utilization of EVA cross-linking reaction, appropriate design lamination time.
The second step EVA solidifies, and this step is accomplished in second chamber of laminating machine, mainly act as to make EVA that cross-linking reaction fully take place, and makes the degree of cross linking reach requirement.The technological parameter of this step need be considered the heatproof of butyl rubber and be connected with the technology in a chamber, makes two chamber beats consistent.
Preferably, the encapsulating material of this process test: 1.First F806 EVA and Kommerling PVS101; 2.First F806 and Truseal LP02; 3.First F806 and Truseal LP03.Shown in the typical processing range table 5 as shown in Figure 9:
In addition; Problems such as some bubbles, the adhesive tape that in above-mentioned lamination process, occurs is excessive all can be solved through the technology management and control of above each step and the adjustment of laminating technology; And above-mentioned characteristic can adopt management and control of traditional conventional technology or adjustment mode, therefore repeats no more at this.
In sum; Can find out, the present invention propose in said silicon-based film solar cells encapsulation field, cooperate the scheme of EVA encapsulating material package assembling as the edge seal material of film battery assembly with butyl hot melt adhesive (hereinafter to be referred as butyl rubber); It is the EVA+Edge-seal scheme; Encapsulate in conjunction with two step of two-chamber laminating technology, can improve the performance and the reliability of hull cell and assembly thereof greatly, and have good market prospects.
Though specify about example embodiment and advantage thereof, be to be understood that under the situation of the protection range that does not break away from the qualification of spirit of the present invention and accompanying claims, can carry out various variations, replacement and modification to these embodiment.For other examples, when those of ordinary skill in the art should understand easily in keeping protection range of the present invention, the order of processing step can change.
In addition, range of application of the present invention is not limited to technology, mechanism, manufacturing, material composition, means, method and the step of the specific embodiment of describing in the specification.From disclosure of the present invention; To easily understand as those of ordinary skill in the art; For the technology, mechanism, manufacturing, material composition, means, method or the step that have existed or be about to later on develop at present; Wherein they are carried out the corresponding embodiment cardinal principle identical functions of describing with the present invention or obtain identical substantially result, can use them according to the present invention.Therefore, accompanying claims of the present invention is intended to these technology, mechanism, manufacturing, material composition, means, method or step are included in its protection range.
Claims (14)
1. the method for packing of a silicon-based film solar cells; Said silicon-based film solar cells is by header board battery sheet, backboard, and the hermetically-sealed construction in the encapsulating structure between said header board battery sheet and the said backboard and the encapsulating structure outside is formed; It is characterized in that this method may further comprise the steps:
Said encapsulating structure is cut;
Said encapsulating structure after cutting is configured on the said header board battery sheet;
Through coating system, the edge of the said encapsulating structure in edge is coated to the strip hermetically-sealed construction that melts on the said header board battery sheet;
Said backboard is configured on the silicon-based film solar cells assembly behind the gluing;
Use two step of two-chamber laminating method to accomplish the encapsulation of said silicon-based film solar cells.
2. the method for packing of silicon-based film solar cells according to claim 1 wherein forms the configuration of said encapsulating structure and the coating of said hermetically-sealed construction simultaneously.
3. the method for packing of silicon-based film solar cells according to claim 1; There are three kinds of processing modes in four jiaos of lap-joints on coated said strip hermetically-sealed construction of wherein said coating system and the said header board battery sheet; Be the fillet processing mode, overlapping processing mode, processing mode at interval.
4. the method for packing of silicon-based film solar cells according to claim 1, wherein said two step of two-chamber laminating method comprises lamination step and silicon-based film solar cells assembly edge overvoltage protection step.
5. the method for packing of silicon-based film solar cells according to claim 4, wherein said lamination step is divided into two steps, i.e. precompressed process steps and encapsulating structure curing schedule.
6. the method for packing of silicon-based film solar cells according to claim 1, the employed material of wherein said encapsulating structure is EVA or PVB.
7. the method for packing of silicon-based film solar cells according to claim 1, wherein said hermetically-sealed construction is the hot melt butyl rubber.
8. the method for packing of silicon-based film solar cells according to claim 1, the coating width of the coated said strip hermetically-sealed construction of wherein said coating system are with the increase of design service time of said silicon-based film solar cells and broadening.
9. to be said strip hermetically-sealed construction adopt circular arcs to handle at said header board battery sheet four jiaos for the method for packing of silicon-based film solar cells according to claim 3, wherein said fillet processing mode.
10. the method for packing of silicon-based film solar cells according to claim 3, wherein said overlapping processing mode is that said strip hermetically-sealed construction is superimposed at the Si Jiaochu of said header board battery sheet.
11. being mutually perpendicular two said strip hermetically-sealed constructions, the method for packing of silicon-based film solar cells according to claim 3, wherein said interval processing mode between four jiaos of places of said header board battery sheet are mutual, have gap less than 1mm.
12. the method for packing of silicon-based film solar cells according to claim 5; Wherein said precompressed process steps is accomplished through first laminated resonator of two step of two-chamber laminater; Make said encapsulating structure and said header board battery sheet and the bonding typing of said backboard, and the gas between said header board battery sheet and said backboard and the said encapsulating structure is extracted out.
13. the method for packing of silicon-based film solar cells according to claim 5, wherein said encapsulating structure curing schedule is accomplished through second laminated resonator of described two step of two-chamber laminater, makes said encapsulating material EVA that cross-linking reaction fully take place.
14. the method for packing of silicon-based film solar cells according to claim 5, wherein said assembly edge overvoltage protection step are to place bearer bar in the said silicon-based film solar cells assembly outside of treating lamination.
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Application publication date: 20120815 |