Source: https://patents.google.com/patent/CN104701401A/en
Timestamp: 2020-02-20 01:25:38
Document Index: 540102942

Matched Legal Cases: ['arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022', 'arts 4022']

CN104701401A - Integrated backboard including aluminum conductive circuit, and back contact type photovoltaic module - Google Patents
Integrated backboard including aluminum conductive circuit, and back contact type photovoltaic module Download PDF
CN104701401A
CN104701401A CN201310642495.3A CN201310642495A CN104701401A CN 104701401 A CN104701401 A CN 104701401A CN 201310642495 A CN201310642495 A CN 201310642495A CN 104701401 A CN104701401 A CN 104701401A
CN201310642495.3A
CN104701401B (en
刘泽琳
穆敏芳
2013-12-04 Application filed by 纳幕尔杜邦公司 filed Critical 纳幕尔杜邦公司
2013-12-04 Priority to CN201310642495.3A priority Critical patent/CN104701401B/en
2015-06-10 Publication of CN104701401A publication Critical patent/CN104701401A/en
2017-05-24 Publication of CN104701401B publication Critical patent/CN104701401B/en
The invention relates to an integrated backboard including an aluminum conductive circuit, and a back contact type photovoltaic module. In the integrated backboard and the back contact type photovoltaic module of the invention, the aluminum conductive circuit comprises a plurality of conductive parts which are directly welded to the front side in a certain pattern through ultrasonic welding with the frequency of 10-50 kHz and the amplitude of 8-50 microns, each of the conductive parts is made of one or more metal materials, and the area of contact between each conductive part and the aluminum conductive circuit is 3-20mm<2>. The technology of the invention is urgently needed for producers of the back contact type photovoltaic module. The back contact type photovoltaic module including an aluminum conductive circuit, produced by the method of the invention, has output power comparable to that of a back contact type photovoltaic module including a copper conductive circuit, the consumption of conductive adhesive and copper can be greatly saved, and the manufacturing cost can be greatly reduced.
Comprise integrated form backboard and the back-contact photovoltaic module of aluminum conducting channel
The present invention relates to integrated form backboard and back-contact photovoltaic module.Particularly, the present invention relates to a kind of the integrated form backboard and the back-contact photovoltaic module that comprise aluminum conducting channel.
Because photovoltage (or solar energy) battery can provide sustainable energy, therefore its scope of application expands rapidly.Business-like conventional silicon solar cell, emitter region and emitter region electrode are all positioned at before battery.
When manufacturing conventional photovoltaic module, in order to the weatherability making it reach at least 25 years, usually barrier-layer cell be clipped in or be laminated between polymer encapsulation layer, and utilizing header board and backboard barrier-layer cell and environment to be isolated further, and providing mechanical support for module.Therefore, header board and backboard are also referred to as external protection plate.
In general, be derived from the photovoltaic module based on crystalline silicon battery plate, according to the sequence of positions of (towards sunny side) from the back side (non-towards sunny side) to above, it has the laminar structure comprised with lower part: (1) backboard, (2) encapsulated layer is carried on the back, (3) barrier-layer cell, (4) front encapsulated layer, and (5) header board.
In the photovoltaic module with this structure, importantly, the material towards sunny side (i.e. header board such as glass plate and front encapsulated layer) being arranged at barrier-layer cell has higher light transmission rate, arrives barrier-layer cell to allow enough daylight.
Encapsulated layer (namely encapsulated layer and back of the body encapsulated layer) is made up of polymeric material usually, such as acid copolymer, ionomer, ethylene-vinyl acetate copolymer (EVA), poly-(vinyl acetal) (as poly-(vinyl butyral) (PVB)), polyurethane, poly-(vinyl chloride), polyethylene (as LLDPE), polyolefin block copolymer elastomer, alpha-olefin and α, the copolymer (as ethylene methyl acrylate copolymer and ethylene butyl acrylate copolymer) of β-ethylenically-unsaturated carboxylic acid ester, silicone elastomer, epoxy resin, and the combination of two or more in these polymeric materials.In these materials, EVA is the most popular selection of barrier-layer cell encapsulated layer material always.Front encapsulated layer can by one or more layers polymeric material laminating molding, and carry on the back encapsulated layer also can by one or more layers polymeric material laminating molding.
The emitter region electrode of business-like conventional silicon barrier-layer cell is positioned at the collection efficiency being conducive to improving charge carrier before battery.But this kind of structure has its limitation: although electrode area occupied is very little, can still can stop portions sunlight, barrier-layer cell effective area of shining light be reduced; During component package, needs are coated with the back side that tin band is welded to another block battery before one piece of battery, and this connected mode makes the difficulty of automated production strengthen.For this reason, researcher transfers to cell backside the electrode be positioned at before battery, develops the back-contact barrier-layer cell that many structures are different.Back-contact barrier-layer cell refers to all or part of a kind of barrier-layer cell being positioned at cell backside of the emitter region electrode of battery.Back-contact battery, with the device architecture of its uniqueness, simple manufacturing process and higher battery efficiency, enjoys the concern of photovoltaic market.Back-contact battery has many good qualities: 1. efficiency is high.Owing to reducing or completely eliminating the shading loss of gate line electrode above, thus improve battery efficiency.2. suitable automatic assembling is produced.Adopt brand-new component package pattern to carry out coplanar connection, both reduced the interval between cell piece, improve packaging density, in turn simplify manufacture craft, reduced encapsulation difficulty.3. more attractive in appearance.Homogeneous before back-contact barrier-layer cell, attractive in appearance, meet the esthetic requirement of consumer.
And in back-contact barrier-layer cell, owing to battery front electrode to be transferred to cell backside, the silver slurry coverage of light-receiving side reduces before battery, thus improve the efficiency of back-contact barrier-layer cell.
At present, the production technology of back-contact photovoltaic module is extremely complicated and cost is very high.Fig. 1 is the cross-sectional schematic of the back-contact photovoltaic module 1000 of prior art.Back-contact photovoltaic module 1000 shown in this figure is along from the back side (non-towards sunny side) to above, the direction order of (towards sunny side) comprises following layer: backboard (or substrate) 1010, the metallic conduction circuit (such as copper conducting channel) 1011 be arranged on backboard, back of the body insulating barrier (or the back of the body encapsulated layer) 1020, back-contact barrier-layer cell 1030, front encapsulated layer 1040 and header board 1050.As shown in fig. 1, there is above the rear side of back-contact barrier-layer cell 1030 multiple electric contact 1031, it aligns with the multiple through holes on insulating backside layer 1020, back-contact barrier-layer cell 1030 also has multiple guiding electrode hole 1032 extending to rear side from front face side, the electrode of the front face side of back-contact barrier-layer cell 1030 is directed in the rear side of battery by this guiding electrode hole 1032 by electrocondution slurry, forms the electric contact 1031 of back-contact barrier-layer cell 1030 rear side.The electrical connection be arranged between electric contact 1031 in the rear side of back-contact barrier-layer cell 1030 and metallic conduction circuit 1011 is that the electric conducting material (as conducting resinl) 1022 in the multiple through holes by being filled on insulating backside layer 1020 provides.
In the prior art, normally prepared by copper or copper alloy for metallic conduction circuit.But because the cost of copper is relatively high, replace copper as metallic conduction circuit material using the metal of other lower costs, become the technique direction reducing back-contact photovoltaic module production cost.Based on this, existing about aluminum conducting channel and the report of integrated form backboard comprising aluminum conducting channel in existing document, but in actual applications, the top layer due to aluminum or aluminum alloy is highly susceptible to being oxidized in atmosphere, forms nonconducting oxide-film (Al 2o 3), thus cause the contact resistance between itself and other electric conducting material (as conducting resinl) too high, finally can cause preparing thus and the battery modules generating efficiency obtained lowly even lost efficacy.Such as, Fig. 2 is that surface is with complete Al 2o 3the scanning electron microscope diagram of the aluminium foil of oxide-film.Can be clear that from this figure: be formed with one deck pellumina A fine and close continuously on the surface in foil substrate, foil substrate and external environment separate by this pellumina A.Therefore, still have problems in the application of aluminum conducting channel in back-contact photovoltaic module, and then receive very large restriction and restriction.
Therefore, for the manufacturer of back-contact photovoltaic module, in the urgent need to one, there is high battery efficiency, can save again the use of conducting resinl and copper, lower-cost production is used for the method for the integrated form backboard of back-contact photovoltaic module, the method for producing back-contact photovoltaic module and the integrated form backboard adopting said method to produce and back-contact photovoltaic module simultaneously.
In view of the integrated form backboard cost comprising copper conducting channel used in prior art back-contact photovoltaic module is higher, the technical conceive that inventor proposes to use the integrated form backboard comprising aluminum conducting channel to carry out alternative routine to comprise the integrated form backboard of copper conducting channel.But; consider that surface of aluminum plate is highly susceptible to oxidation; thus the power output of the integrated form backboard comprising aluminum conducting channel can be caused very low due to surface oxidation effect, therefore, need in manufacturing process, take some technological means process aluminium sheet and protect.
The present invention adopts ultrasonic welding method, namely by applying frequency in the ultrasonic bonding at 8-50 μm of 10-50 kHz and amplitude, while the oxide-film destroying the continuous densification on aluminum conductive circuit surface, metallic conduction parts are directly connected to above aluminum conducting channel, successfully solve the above-mentioned problems in the prior art.In welding process, welding device experience welding thermal process, metallurgical reaction, and the effect of welding stress and distortion, thus can make the chemical composition of weld part near zone, metallographic structure etc. change.Specifically, when high-energy being applied to above aluminum conducting channel by ultrasonic bonding, the continuous Al above aluminum conductive circuit surface 2o 3there is fragmentation and be dispersed in aluminium sheet matrix to form disperse phase B(see Fig. 3 in oxide-film (see Fig. 2)); expose fresh aluminium surface thus and on fresh aluminium surface direct connection metal conductive component; by this syndeton; fresh aluminium surface is protected and avoids being oxidized, and produces effective electrical connection of low-resistivity thus.
The present invention utilizes surface to have Al 2o 3the aluminum conducting channel of oxide-film carrys out the copper conducting channel of high cost in alternative prior art, thus achieves the low cost being suitable for applying and comprise the integrated form backboard of aluminum conducting channel.Meanwhile, the present invention, thus will the serious continuous print Al hindering conduction switching performance in surface of aluminum plate by applying frequency in the ultrasonic bonding at 8-50 μm of 10-50 kHz and amplitude 2o 3film destruction (comparison diagram 2 and Fig. 3, wherein Fig. 3 shows the Electronic Speculum figure of nickel-clad copper and the aluminum conducting channel linked together by ultrasonic bonding), thus reduce the resistance in aluminium and other Metal Contact faces, substantially increase conductivity.
The back-contact photovoltaic module comprising aluminum conducting channel adopting method of the present invention to produce both had had the power output comparable with the back-contact photovoltaic module comprising copper conducting channel, greatly can save again the consumption of conducting resinl and copper, thus significantly reduce manufacturing cost.
Specifically, the present invention relates to the content of following many aspects:
1., for the integrated form backboard comprising aluminum conducting channel of back-contact photovoltaic module, described integrated form backboard comprises along from the back side to direction order above:
There is the substrate of rear side respect to one another and front face side;
Be arranged on the aluminum conducting channel in the described front face side of described substrate, it has the front face side adjacent with described substrate and the rear side away from described substrate;
The back of the body insulating barrier adjacent with described aluminum conducting channel, described back of the body insulating barrier has the rear side adjacent with described aluminum conducting channel and the front face side away from described aluminum conducting channel, and described back of the body insulating barrier has the through hole that multiple rear side from described back of the body insulating barrier extends to the front face side of described back of the body insulating barrier, described through hole aims at described conducting channel;
Wherein, each through hole in described multiple through hole type electrical interconnection member that is combined is full of, described combined electrical interconnection member comprises electricity bonding parts and to bond the conductive component of parts shape complementarity with described electricity, described electricity bonding parts are near the front face side of described back of the body insulating barrier, described conductive component is made up of one or more metal materials, be directly be welded on the front face side of described aluminum conducting channel at 10-50 kHz and amplitude the ultrasonic bonding of 8-50 μm by frequency, and the contact area of itself and described aluminum conducting channel front face side is 3-20 mm 2,
When using described integrated form backboard to produce back-contact photovoltaic module, on the electric contact above the rear side that the electricity bonding parts of described combined electrical interconnection member are adhered to back-contact barrier-layer cell.
2. the integrated form backboard according to aspect 1, it is characterized in that, one or more metal materials described are selected from the material group comprising copper, tin, nickel, titanium, silver-plated copper, nickel-clad copper, copper facing aluminium, tin-coated copper, gold-plated nickel, stainless steel and their alloy and combination.
3. the integrated form backboard according to aspect 1, is characterized in that, in described combined electric interconnecting member, described conductive component accounts for the 3-95 % of described combined electric interconnecting member cumulative volume.
4. the integrated form backboard according to aspect 1, is characterized in that, described electricity bonding parts are by comprising at least 5%(volumn concentration) the electric conducting material of macromolecular material make.
5. the integrated form backboard according to aspect 4, is characterized in that, described electricity bonding parts are made up of conducting polymer composite.
6. the integrated form backboard according to aspect 4, is characterized in that, described electricity bonding parts are made up of conducting resinl, and described conducting resinl comprises macromolecular material and dispersion conducting particles wherein.
7. the integrated form backboard according to aspect 6, is characterized in that, described conducting particles is selected from the group comprising gold, silver, nickel, copper, aluminium, tin, zinc, titanium, bismuth, tungsten, lead and alloy thereof.
8. the integrated form backboard according to aspect 1, is characterized in that, described back of the body insulating barrier is made up of one or more layers polymer film or plate.
9. the integrated form backboard according to aspect 8, it is characterized in that, at least one deck in described back of the body insulating barrier is made up of the polymer composition comprising ethylene-vinyl acetate copolymer (EVA), ionomer (ionomer) or poly-(vinyl butyral) (PVB).
10. the integrated form backboard according to aspect 1, is characterized in that, the thickness of described aluminum conducting channel is at 30-250 micron.
11. 1 kinds of back-contact photovoltaic modules, described back-contact photovoltaic module comprises along from the back side to direction order above:
The integrated form backboard comprising aluminum conducting channel according to any one of aspect 1-10;
Back-contact barrier-layer cell, described back-contact barrier-layer cell has light-receiving side and rear side above respect to one another, and multiple electric contact is formed in above the described rear side of described back-contact barrier-layer cell, the rear side of described back-contact barrier-layer cell and the back of the body insulating barrier of described integrated form backboard adjoin, and multiple electric contact of described back-contact barrier-layer cell rear side aligns with multiple through holes of described back of the body insulating barrier and the parts that bond with electricity are wherein connected;
Encapsulated layer before adjacent with the described front face side of described back-contact barrier-layer cell; With
The transparent front plate adjacent with described front encapsulated layer.
12. back-contact photovoltaic modules according to aspect 11, is characterized in that, described back-contact barrier-layer cell is run through through metallization the barrier-layer cell being wound around process (MWT).
The present invention has following beneficial effect especially:
Technology of the present invention for the manufacturer of back-contact photovoltaic module in the urgent need to.The back-contact photovoltaic module comprising aluminum conducting channel adopting ultrasonic welding method of the present invention to produce both had had the power output comparable with the back-contact photovoltaic module comprising copper conducting channel, greatly can save again the consumption of conducting resinl and copper, thus significantly reduce manufacturing cost and there is considerable cost benefit.
Characterize advantage of the present invention and novel feature specifically to indicate being attached to herein and forming in claims of a part herein.But, in order to understand the present invention, its advantage better and apply by it target reached, with reference to the item of the accompanying drawing forming another part herein and the descriptive nature of enclosing, should wherein illustrate and describe one or more preferred embodiment of the present invention.
Describe the present invention below in conjunction with Figure of description.Figure of description might not be carry out drawing in strict accordance with ratio and Figure of description is only schematic diagram.In the drawings in the descriptive section of the present application, same or analogous drawing reference numeral is used to represent same or analogous element.
Fig. 1 is the generalized section of the laminar structure of the back-contact photovoltaic module of prior art, illustrate in detail and provide with between copper conducting channel the electric conducting material be electrically connected for the electric contact on the described rear side of described back-contact barrier-layer cell in this figure;
Fig. 2 is that surface is with complete Al 2o 3the scanning electron microscope diagram of the aluminium foil of oxide-film;
Fig. 3 shows the scanning electron microscope diagram of the nickel-clad copper that links together by ultrasonic bonding of the present invention and aluminium foil;
Fig. 4 is the generalized section of the back-contact photovoltaic module comprising combined conductive member of the present invention; With
Fig. 5 a-5g is the schematic flow sheet comprising the production method of the integrated form backboard of aluminum conducting channel for back-contact photovoltaic module of the present invention.
Parts and reference numerals list
1000 Back-contact photovoltaic module 1010 Substrate 1011 Metallic conduction circuit 1020 Back of the body insulating barrier 1022 Electric conducting material 1030 Back-contact barrier-layer cell 1031 Electric contact 1032 Guiding electrode hole 1040 Front encapsulated layer 1050 Header board 4000 Back-contact photovoltaic module 4000a Comprise the integrated form backboard of aluminum conducting channel 4001 Aluminium sheet (aluminium foil) 4010 Substrate 4011 Aluminum conducting channel 4020 Back of the body insulating barrier 4021 Through hole 4022 Combined conductive member 4022a Electricity bonding parts 4022b Conductive component 4030 Back-contact barrier-layer cell 4031 Electric contact 4032 Guiding electrode hole 4040 Front encapsulated layer 4050 Header board A Continuous print Al 2O 3Film B Disperse phase
Unless special circumstances have other to limit, otherwise following definition is applicable to the term that uses in this specification.
In addition, unless otherwise defined, otherwise the implication of all scientific and technical terminologies used herein usually to understand with those skilled in the art in the invention be the same.If conflict occurs, be as the criterion with this specification and the definition that comprises thereof.
Although with methods described herein and material type like or the method that is equal to and material practice all used in the present invention or inspection, suitable method and material are as those described herein.
Some terms used in the application are defined as follows:
As used herein, term " aluminum conducting channel " or " aluminium circuit " refer to the conducting channel be made up of aluminum or aluminum alloy.Wherein aluminium alloy take aluminium as the alloy general name of base, is namely matrix element and the alloy material adding one or more alloying elements composition with aluminium.In described cond aluminium, the content of aluminium element is 90 % by weight or higher or 95 % by weight or higher or 97 % by weight or higher, and main non-aluminum alloying element comprises, but be not limited to, copper, silicon, magnesium, zinc, manganese, secondary non-aluminum alloying element comprises, but be not limited to, nickel, iron, titanium, chromium, boron, lithium etc.
As used herein, directional terminology " on ", D score is consistent with the concrete direction on Figure of description paper.
As used herein, directional terminology " above ", " back side ", " front face side ", " rear side " and be consistent to the usual call of back-contact photovoltaic module in the art.
As used herein, term " about " is exponential quantity, size, formula, parameter and other quantity and characteristic are coarse and need not be accurate value, but can be similar to exact value and/or be greater than or less than exact value, to reflect allowable deviation, conversion factor, the numerical value revision of the convention, measure error etc., and those skilled in the art's other factors known.In general, quantity, size, formula, parameter or other amounts or characteristic are " about " or " approximate ", no matter whether carry out this type of and clearly state.
In addition, scope as herein described comprises their end points, unless clearly stated on rare occasions.In addition, when a quantity, concentration or other numerical value or parameter provide with the tabular form of scope, one or more preferable range or preferred upper limit numerical value and preferred lower limit numerical value, it is interpreted as any all scopes formed for a pair disclosed particularly by any range limit or preferred value and any range lower limit or preferred value, and no matter whether this type of scope is by open individually.
In addition, herein when enumerating number range, this scope is intended to comprise its end points and all integers within the scope of this and mark, unless indicated other in particular situations.When a definition scope, be not intended to scope of the present invention to be defined in cited occurrence.Finally, when term " about " is for describing the end points of numerical value or scope, content of the present disclosure should be understood to include this concrete numerical value or involved end points.
When herein when describing material, method or plant equipment with the word of " those skilled in the art is known " phrase or synonym or phrase time, this term represents that described material, method and plant equipment are conventional when submitting present patent application to, and is included in this explanation.Be covered by this description equally, not conventional at present but will art-recognized material, method and machinery be become when being applicable to similar object.
As used herein, term " comprises ", " containing ", " comprising ", " containing ", " being characterised in that ", " having " or any other synonym or their any other distortion all refer to comprising of nonexcludability.Such as, comprise the technique of specific factor list, method, goods or equipment and need not be only limitted to those key elements specifically listed, but other key elements clearly do not listed can be comprised, or the key element that this type of technique, method, goods or equipment are intrinsic.
The scope of claim is limited in the material or step of specifying by transition phrase " substantially by ... composition ", and the essential characteristic that can not have claimed invention and new feature cause those materials or the step of materially affect." claim of ' substantially by ... composition ' is in between the closed claims of ' by ... composition ' format writing and the scope of full open model claim of writing with ' comprise/comprise ' form ".
When applicant uses open-ended term such as " to comprise " to describe invention or its part, should be appreciated that this explanation also comprises and use term defined above " substantially by ... composition " description that this invention is carried out, unless indicated in particular situations.
Measure word " one " and " one " are for describing key element of the present invention or component.These measure word are used to be intended to show to exist a kind of or these key elements of at least one or component.Although adopt this type of measure word normally to show that adorned noun is singular noun, as used herein, measure word " " and " one " also comprise plural number, unless indicated in addition in particular situations.Equally, as used herein, demonstrative pronoun " is somebody's turn to do " and also represents that adorned noun can be odd number or plural number, unless indicated in addition in particular situations.
As used herein, term " back-contact photovoltaic module " means the functional finished device comprising the multilayer laminate such as shown in the application Fig. 4; Term " integrated form backboard " means producing the multilayer semi-finished product assembly (the Reference numeral 4000a see in Fig. 5 g) formed in the lamination process of back-contact photovoltaic module; Term " back-contact barrier-layer cell " means in back-contact photovoltaic module, play core functional components light energy conversion being become electric energy effect.
In addition, term " back of the body insulating barrier " means one or more layers polymer film in back-contact photovoltaic module between conducting channel and back-contact barrier-layer cell or sheet, and it serves the effect of encapsulation and/or insulation.
Term " copolymer " refers to the polymer comprising copolymerization units or carried out the residue that copolymerisation generates by two or more comonomers.In this connection, copolymer can describe in this article in conjunction with the quantity of its copolymerize monomer or its copolymerize monomer, such as " copolymer comprises ethene and 9 %(weight percentages) acrylic acid ", or the description that similar.This type of description can be regarded as informal, because it is not used as comonomer as copolymerization units; Such as, because it does not comprise the routine name of copolymer, the name of IUPAC (IUPAC); Because it is using method restriction article term not; Or because other reasons.But as used herein, to the description that copolymer carries out, the amount in conjunction with its copolymerize monomer or its copolymerize monomer refers to that this copolymer contains the copolymerization units (having specified amount when specifying) of appointment comonomer.Draw following inference thus, copolymer is not the product of the reactant mixture of the given comonomer comprising specified rate, clearly states unless carried out this type of in restriction situation.
Term " acid copolymer " refers to the polymer comprising alpha-olefin, α, β-ethylenic unsaturated carboxylic acid and the optionally copolymerization units of other suitable comonomers (such as α, β-ethylenically-unsaturated carboxylic acid ester).
Term " ionomer " refers to the polymer prepared by partially or completely neutralizing acid copolymer as above.More particularly, ionomer comprises ionic group, and described ionic group is metal ion carboxylate, such as the mixture of alkali metal carboxylate, alkaline earth metal carboxylation, transition metal carboxylate and this type of carboxylate.As defined herein, this base polymer is prepared by the hydroxy-acid group partially or completely neutralizing (such as by with alkali reaction) precursor or matrix polymer usually, and wherein precursor or matrix polymer are acid copolymer.The ionomeric example of alkali metal used herein is sodium ionomer (or sodium neutralization ionomer), the copolymer of such as ethene and methacrylic acid, and all or part of of the wherein hydroxy-acid group of the methacrylic acid unit of copolymerization is carboxylic acid sodium form.
As herein so that form (such as " lamination " or " lamination ") is used alone or in combination, term " layered product " refers at least two-layer structure having and firmly adhere to or bond.These layers can directly or indirectly adhere to each other." directly " mean two-layer between there is no additional materials, such as interlayer or adhesive phase; " indirectly " mean two-layer between have additional materials.
Material herein, method and embodiment are only illustrative, and not intended to be limits, unless otherwise specified.
Finally, listed herein all percentages, number etc. all by weight, unless be otherwise noted in concrete example.
Below in conjunction with Figure of description, multiple embodiment of the present invention is described in detail.
Fig. 4 is the generalized section of the back-contact photovoltaic module 4000 comprising aluminum conducting channel of the present invention.Back-contact photovoltaic module 4000 of the present invention is made by laminated multi-layer.As shown in Figure 4, back-contact photovoltaic module 4000 of the present invention is along from the back side (non-towards sunny side) to above, the direction order of (towards sunny side) comprises following layer: substrate 4010, the aluminum conducting channel 4011 be arranged on substrate 4010, the back of the body insulating barrier 4020 being provided with multiple through hole 4021, back-contact barrier-layer cell 4030, front encapsulated layer 4040, header board 4050, and wherein any layer all has front face side (towards sunny side) and rear side (non-towards sunny side).Back-contact barrier-layer cell 4030 has the front face side upside of back-contact barrier-layer cell 4030 (in the Fig. 4) of reception light respect to one another and the rear side downside of back-contact barrier-layer cell 4030 (in the Fig. 4), and multiple electric contact 4031 is formed in above the rear side of back-contact barrier-layer cell 4030, the rear side of back-contact barrier-layer cell 4030 is adjacent with back of the body insulating barrier 4020, and the multiple electric contacts 4031 in its rear side align with the multiple through holes 4021 in back of the body insulating barrier 4020; Each through hole in multiple through hole 4021 type conductive member 4022 that is combined is full of.This combined conductive member 4022 comprises electricity bonding parts 4022a and through hole 4021 in and the conductive component 4022b of its shape complementarity.In back-contact photovoltaic module 4000, this electricity bonding parts 4022a is adhered on electric contact 4031, and this conductive component 4022b is made up of one or more metal materials and is directly welded on the front face side of aluminum conducting channel 4011 at 10-50 kHz and amplitude the ultrasonic bonding of 8-50 μm by frequency.In addition, the contact area of the front face side of each and aluminum conducting channel 4011 in multiple conductive component 4022b is 3-20 mm 2.Thus, the electrical connection between electric contact 4031 in the rear side of back-contact barrier-layer cell 4030 and aluminum conducting channel 4011 is achieved via combinations thereof type conductive member 4022.
The header board 4050 such as glass plate and front encapsulated layer 4040 of back-contact photovoltaic module 4000 preferably have higher light transmission rate, arrive back-contact barrier-layer cell 4030 to allow enough daylight.In the back-contact photovoltaic module 4000 of the present invention shown in Fig. 4, header board 4050 and front encapsulated layer 4040 are all transparent.Front encapsulated layer 4040 and back of the body insulating barrier 4020 can be made up of polymeric material such as ethylene-vinyl acetate copolymer (EVA) respectively.Front encapsulated layer 4040 and back of the body insulating barrier 4020 separately can by one or more layers polymeric material (polymer film or plate) laminating moldings.Specifically, the material of front encapsulated layer 4040 and/or back of the body insulating barrier 4020 of being used for being shaped can be selected from the composition of the polymer comprising ethylene-vinyl acetate copolymer (EVA), ionomer (ionomer) or poly-(vinyl butyral) (PVB).Wherein, back of the body insulating barrier 4020 can be single or multiple lift structure, has both served the encapsulation effect to battery, and has served again the electric insulation effect between battery and aluminum conducting channel.Preferably, by least one deck in the described back of the body insulating barrier of multiple layer of polymeric material laminating molding by comprising ethylene-vinyl acetate copolymer, the polymer composition of ionomer or poly-(vinyl butyral) makes.Preferably, the thickness of aluminum conducting channel 4011 is at 30-250 micron.In back-contact photovoltaic module 4000, back-contact barrier-layer cell 4030 runs through the barrier-layer cell being wound around process (MWT) preferably past metallization.In combined conductive member 4022, electricity bonding parts 4022a can be made up of conducting resinl, conducting polymer composite or solder, described conducting resinl comprises macromolecular material and dispersion conducting particles wherein, and described conducting particles is selected from the group comprising gold, silver, nickel, copper, aluminium, tin, zinc, titanium, bismuth, tungsten, lead and alloy thereof.Such as electricity bonding parts 4022a can by comprising at least 5%(volumn concentration) the electric conducting material of macromolecular material make.Conductive component 4022b can be made up of one or more metal materials, and one or more metal materials described are selected from the material group comprising copper, aluminium, tungsten, tin, nickel, titanium, silver-plated copper, nickel-clad copper, tin-coated copper, copper facing aluminium, zinc-plated aluminium, gold-plated nickel, stainless steel and their alloy and combination.In combined conductive member 4022, conductive component 4022b can account for the 3-95 % of the cumulative volume of combined conductive member 4022.
Part in back-contact photovoltaic module 4000 of the present invention except back-contact barrier-layer cell 4030, front encapsulated layer 4040, header board 4050 can cellular manufacturing, and described unit is called " integrated form backboard " or " comprising the integrated form backboard of aluminum conducting channel " 4000a(see Fig. 5 g by those skilled in the art).The cellular manufacturing comprising the integrated form backboard 4000a of aluminum conducting channel 4011 is very favorable for the production of back-contact photovoltaic module 4000 of the present invention.
Fig. 5 g is the generalized section comprising the laminar structure of the integrated form backboard 4000a of aluminum conducting channel 4011 of the present invention.The integrated form backboard of described aluminum conducting channel comprises along from the back side to direction order above: the substrate 4010 with rear side respect to one another and front face side; Be arranged on the aluminum conducting channel 4011 in the front face side of substrate 4010; The back of the body insulating barrier 4020 adjacent with aluminum conducting channel 4011, back of the body insulating barrier 4020 has the rear side adjacent with aluminum conducting channel 4011 and the front face side away from aluminum conducting channel 4011, and back of the body insulating barrier 4020 has the through hole 4021 of the front face side extending to described back of the body insulating barrier from the rear side of described back of the body insulating barrier, through hole 4021 aims at aluminum conducting channel 4011; Wherein, the through hole 4021 type conductive member 4022 that is combined is full of, combined conductive member 4022 comprises electricity bonding parts 4022a and to bond the conductive component 4022b of parts 4022a shape complementarity with described electricity, this conductive component 4022b is made up of one or more metal materials, and is directly welded on the front face side of aluminum conducting channel 4011 at 10-50 kHz and amplitude the ultrasonic bonding of 8-50 μm by frequency.In addition, the contact area of the front face side of each and aluminum conducting channel 4011 in conductive component 4022b is 3-20 mm 2.When using integrated form backboard 4000a to produce back-contact photovoltaic module 4000, on the electric contact 4031 above the rear side that the electricity bonding parts 4022b in combined conductive member 4022 is adhered to back-contact barrier-layer cell.
Metal solder comprises liquid welding and solid State Welding.So-called metal solder exactly by heating or pressurize, or both and mode, two metal partss be made up of different or same metal or metal alloy compositions are produced between atom on its interface and combine, thus form intermetallic connection.In some cases, the third metal or metal alloy material can also be introduced as solder respectively and formed between atom between two metal partss and combine on the interface of two metal partss, thus form intermetallic and connect.
In general, liquid welding requirements welding temperature is higher than one or more the fusing point in soldered two metal partss and solder.In liquid welding process, on weld interface, one or more in two soldered metal partss and solder can form liquid-metal layer, solidification of then lowering the temperature, and the metal forming two metal partss connects.The parts being welded preparation by liquid state have following features: namely due to before implementing liquid welding, the surface of the metal parts be connected needs to carry out deoxidation film process (as pickling or machinery scraping) and/or anti-oxidant treatment, so, metal linkage interface after welding there is no metal oxide.Aluminum conducting channel used in the present invention, because aluminum and its alloy is very easy to form oxide in atmosphere, this oxide can be formed while high-temperature soldering.Even if thus carried out the process of deoxidation film before welding, aluminium or Al-alloy products still can not have been formed metal with other metal partss and be connected by liquid welding.
Ultrasonic bonding of the present invention belongs to the one of solid State Welding.Solid State Welding generally comprises ultrasonic bond, diffusion welding (DW), friction welding (FW), explosive welding (EW), thermocompression bonding and smithwelding.In solid State Welding process, do not require that welding temperature is higher than any one the fusing point in soldered two metal partss or solder, the method completely by physics between the metal parts be connected overcomes the unevenness on its surface.Wherein, implementing explosive welding (EW) is, due to the effect of High Temperature And Velocity air blast, the oxide of metal part surface and other pollutants can be pulled away, so the metal parts interface connected by explosive welding (EW) do not have oxide.And for friction welding (FW), thermocompression bonding and smithwelding, owing to implementing high pressure in welding process, so one or two in two metal partss connected by these welding methods can produce deformation.For ultrasonic bond and diffusion welding (DW), before enforcement welding, the surface of the metal parts be connected does not need to carry out the process of deoxidation film and/or anti-oxidant treatment, so, by the metal parts after ultrasonic bond or diffusion welding (DW) welding, its linkage interface still also has by break up with the existence of discontinuous metal oxide.The difference of the two is, Diffusion Welding implements under the high temperature of long period and the effect of certain pressure, interatomic mutual diffusion is there is between two soldered metal partss, a crystalline phase may be formed, on the linkage interface of the metal parts connected by ultrasonic bond then can not between the formation of crystalline phase.
Except ultrasonic bonding, solid State Welding also comprises diffusion welding (DW), friction welding (FW), explosive welding (EW) and smithwelding.Compared to these solid State Welding modes, ultrasonic bonding is applicable to the welding between metallic film more, the especially metallic film of thickness between 10 μm of-3mm.Supersonic welding is connected to its original advantage: because do not have mutually liquid and high pressure, soldered two parts are not just compressed or torsional deformation; Simultaneously, before ultrasonic bonding, metal surface does not need clean, because the continuous phase of the oxide of metal surface and/or pollutant can be destroyed while ultrasonic bonding again, and is distributed to the low resistance ensureing metal member attachment interface in soldered parts.Other welding manners then can not obtain this effect.Such as Diffusion Welding, under the influence of high pressure and temperature, the interface of two welding assemblies there is interatomic mutual diffusion, formed and connect.Because the existence of high temperature, the surface of two welding assemblies has has more metal oxide compared to the surface of the parts without welding, simultaneously when welding two kinds of different metals, the linkage interface of parts also has intermetallic phase.Other solid State Welding mode, or need very large pressure, cause the gross distortion of welding position upper-part, as smithwelding, or need the liquid phase introducing local in the process of welding, also can cause the local deformation becoming welding position, as friction welding (FW).
Therefore, for the integrated form backboard 4000a comprising aluminum conducting channel 4011 of the present invention, because the metal between conductive component 4022b with aluminum conducting channel 4011 is connected formed by ultrasonic bonding, so the tie point place of conductive component 4022b and aluminum conducting channel 4011 has following three features simultaneously: (1) on aluminum conducting channel 4011 interface with conductive component 4022b or in aluminum conducting channel 4011 <10 μm, distance interface region in have the existence of oxygen element; (2) on the position of the linkage interface with conductive component 4022b, aluminum conducting channel 4011 is being no more than 10% perpendicular to the deformation on the direction of weld interface; (3) interatomic mutual diffusion is not had at aluminum conducting channel 4011 and the linkage interface place of conductive component 4022b.Make thus to define effective electrical connection between conductive component 4022b with aluminum conducting channel 4011.These features can be undertaken analyzing by such as following methods and determine.Such as, the method can cut with ion beam on the direction at the interface perpendicular to conductive component 4022b and aluminum conducting channel 4011, obtain the cross section perpendicular to connecting plane, then in scanning electron microscopy, X-ray energy spectrum is utilized to carry out elementary analysis, if conductive component 4022b and aluminum conducting channel 4011 are linked together by ultrasonic bonding, the existence of oxygen element then can be analyzed in the region of conductive component 4022b or aluminum conducting channel 4011 middle distance interface <10 μm, and at aluminum conducting channel 4011(or conductive component 4022b) in can not find in the region of linkage interface form the conductive component 4022b(that is attached thereto or aluminum conducting channel 4011) element.In addition, cross section at the interface perpendicular to conductive component 4022b and aluminum conducting channel 4011 can also be obtained by the method for mechanical polishing, with scanning electron microscopy measurement aluminum conducting channel 4011 with conductive component 4022b and the varied in thickness in region that is not connected with conductive component 4022b.If conductive component 4022b and aluminum conducting channel 4011 are linked together by ultrasonic bonding, then this varied in thickness is no more than 10%.
Above the mentioned integrated form backboard 4000a comprising aluminum conducting channel for back-contact photovoltaic module can adopt method described below to manufacture (see Fig. 5 a-5g):
A () provides the substrate 4010 with rear side respect to one another and front face side;
B () provides an aluminium sheet 4001 with rear side respect to one another and front face side, this aluminium sheet is made (see Fig. 5 a) by aluminum or aluminum alloy;
C multiple conductive component 4022b is directly welded on the front face side of aluminium sheet 4001 by () with certain pattern the ultrasonic bonding of 8-50 μm at 10-50 kHz and amplitude by frequency, each in conductive component 4022b is made up of one or more metal materials and the contact area of itself and aluminium sheet is 3-20 mm 2(see Fig. 5 b);
D aluminium sheet 4001 is laminated to the front face side of substrate 4010 by (), wherein the rear side of aluminium sheet 4001 contacts (see Fig. 5 c) with the front face side of substrate 4010;
E () cuts out certain pattern to make aluminum conducting channel 4011(see Fig. 5 d on aluminium sheet 4001);
F () provides the back of the body insulating barrier 4020 with rear side respect to one another and front face side, be laminated to the front face side (see Fig. 5 e) of aluminum conducting channel 4011, and multiple through holes 4021 that the rear side of carrying on the back insulating barrier 4020 extends to its front face side are come from shaping in described back of the body insulating barrier 4020, the quantity of through hole 4021 is consistent with the conductive component 4022b in aluminum conducting channel 4011 with arrangement pattern, and through hole 4021 is aimed at (see Fig. 5 f) with the conductive component 4022b be welded in aluminum conducting channel 4011; Or, the back of the body insulating barrier 4020 with rear side respect to one another and front face side is provided, and multiple through holes 4021 that its rear side extends to its front face side are come from shaping in back of the body insulating barrier 4020, the quantity of through hole 4021 is consistent with the conductive component 4022b in aluminum conducting channel 4011 with arrangement pattern, and will carry on the back insulating barrier 4020 and be laminated to the front face side of aluminum conducting channel 4011 with the form making through hole 4021 aim at the conductive component 4022b be welded in aluminum conducting channel 4011;
G () is filled electricity bonding parts 4022a thus is full of described through hole to comprise aluminum conducting channel 4011 integrated form backboard 4000a to be shaped in through hole 4021, wherein electricity bonding parts 4022a is near back of the body insulating barrier 4020 front face side, and the parts 4022a shape complementarity and conductive component 4022b and electricity bond also becomes combined conductive member 4022 jointly.
In actual production process, also can carry out the change in order to step described above.Such as, can first aluminium sheet 4001 be carried out cutting (step (e)) before ultrasonic bond (step (c)).Thus, the lamination between aluminum conducting channel 4011 and substrate 4010 and the lamination carried on the back between insulating barrier 4020 and aluminum conducting channel 4011 can carry out at the same time or separately.General, after must completing in the front face side (ultrasonic welding step) conductive component 4022b being soldered to aluminum conducting channel 4011, just can further by the aluminum conducting channel 4011 being welded with conductive component 4022b and substrate 4010 and/or carry on the back insulating barrier 4020 lamination and carry out lamination.In addition, the change in these sequence of steps does not have other to limit.
Further, invention further discloses a kind of method of producing back-contact photovoltaic module 4000, said method comprising the steps of:
(g) after as above producing above-mentioned integrated form backboard 4000a (Fig. 5 g), further by have light-receiving side above respect to one another and rear side and the back-contact barrier-layer cell 4030 of the multiple electric contacts 4031 being formed in this rear side be stacked in comprise aluminum conducting channel 4011 integrated form backboard 4000a on and the bonding of the electricity in through hole 4021 parts 4022a is directly contacted with the electric contact 4031 of back-contact barrier-layer cell 4030 rear side;
H front encapsulated layer 4040 to be stacked in before back-contact barrier-layer cell 4030 on light-receiving side by ();
(i) transparent front plate 4050 to be stacked in above front encapsulated layer 4040;
As above j the sandwich construction obtained is carried out lamination to obtain back-contact photovoltaic module 4000(see Fig. 4 by ()).
Technology of the present invention for the manufacturer of back-contact photovoltaic module in the urgent need to.The integrated form backboard comprising aluminum conducting channel adopting method of the present invention to produce and back-contact photovoltaic module all can save the consumption of conducting resinl and copper greatly, significantly reduce manufacturing cost, the usefulness of back-contact photovoltaic module can be improved again simultaneously.
In further detail Advantageous Effects of the present invention is described below by way of example, but the present invention is not limited to these examples below.
The concrete material that photovoltaic module of the present invention (photovoltaic module) uses is as follows:
mWT battery: 156 millimeters of polycrystalline silicon metal run through winding (MWT) back contacts photovoltaic cell, purchased from JA Solar Holdings Co., Ltd.;
glass plate: 3.2 millimeters of ultra-clear glasses, purchased from Henan Si Keda new forms of energy Co., Ltd;
eVA film-1: with " Rui Fu " (Revax tM) trade (brand) name is purchased from ethylene-vinyl acetate copolymer (EVA) film of 450 micron thickness of Wenzhou Ruiyang Photovoltaic Material Co., Ltd.;
eVA film-2: the EVA film of 250 micron thickness at the temperature of 100 DEG C, EVA film-1 hot pressing obtained for 5 minutes;
pET film: with Melinex tM(thickness is 188 microns to PETG (polyethylene terephthalate) film of warp (both sides) corona treatment of S trade (brand) name available from DuPont Supreme Being people film (DuPont Teijin Films) (U.S.A.) company, and density is 1.40 g/cm 3);
eCP-1(ethylene acrylate copolymer resin): with ethylene acrylate copolymer (ethylene/acrylate copolymer) resin of the modification of trade name Bynel 22E757 available from DuPont company;
eCP-2(ethylene methacrylic acid copolymer resin): with the ethylene methacrylic acid copolymer of trade name Nucrel 0910 available from DuPont company (Ethylene methacrylic acid copolymer) resin;
pVF film: with the polyvinyl fluoride of trade name Tedlar available from DuPont company (polyvinyl fluoride) oriented film, thickness is 38 microns;
polyurethane binder: with two-part polyurethane (polyurethane) adhesive of trade name PP-5430 purchased from Mitsui (Mitsui) company;
copper Foil-1: purchased from the Copper Foil of 35 micron thickness of Chinese Suzhou Co., Ltd of FUKUDA METAL;
copper Foil-2: purchased from the Copper Foil of 105 micron thickness of Chinese Suzhou Co., Ltd of FUKUDA METAL;
nickel plating Copper Foil: there is the Copper Foil of 50 micron thickness of the Ni layer of 500 nanometer thickness purchased from plating on the surface of Changchun group;
aluminium foil-1: purchased from the aluminium foil of 50 micron thickness of Chinese product (Kunshan) Electronics Co., Ltd.;
aluminium foil-2: purchased from Foshan to the aluminium foil of 200 micron thickness of benevolence aluminium sheet strip and foil Co., Ltd;
eCA-1(conducting resinl-1): with the conducting resinl containing silver particles of trade name Thermoset MD-140 purchased from LORD Corporation (U.S.);
eCA-2(conducting resinl-2): the conducting resinl based on mixed elastomer of the film containing silver particles (final silver concentration is 78wt%) of following preparation: first by 16.5 grams of ethylene/methyl acrylate copolymer (E/MA, methyl acrylate containing 62 % by weight) and 16.5 grams of ethylene-vinyl acetate copolymer (EVA, containing the vinyl acetate of 33 % by weight, with trade name Elvax PV1650 purchased from E.I.Du Pont Company) with 0.4 gram of peroxide (with trade name LQ-TBEC purchased from Lanzhou of China auxiliary reagent factory), 0.3 gram of silane coupler (with trade name KBM403 purchased from Japanese Shin-Etsu Chemial Co., Ltd) and 0.12 gram of antioxidant are (with trade name Irganox tMmD1024 is purchased from BASF Aktiengesellschaft) premix, and then ball shape silver powder (du pont company) banburying at 80 DEG C of to be the amorphous silver powder (Kunming Nuo Man Electron Material Co., Ltd) of 3-5 micron and 25 gram particle footpaths by gained pre-composition and 92 gram particle footpaths be 5.4-11 micron is made and is obtained for blended 10 minutes,
the preparation of substrate
First the polyurethane adhesive layer of 10 micron thickness is used to be adhered to above the side of PET film by PVF film.Then, on the extruding layer press manufactured by Davis Standard, by mixture extrusion molding face on a pet film under the extrusion temperature of 285 DEG C of the ECP-1 resin that mixes with the weight ratio of 1:1 and ECP-2 resin, thus form the tie layer that thickness is approximately 100 microns.Obtain for the substrate in following instance thus, the side wherein with tie layer is the front face side adjacent with conducting channel.
back-contact photovoltaic module power output method of testing
The power output of back-contact photovoltaic module obtains by using SPI-SUN Simulators 3500SLP type solar simulator and PV module QA detector to measure.
First, the back-contact photovoltaic module comprising copper conducting channel has been prepared by following steps: by the front face side of Copper Foil vacuum lamination to substrate; Hand cut Copper Foil thus mold the copper conducting channel with preset pattern; Go out with certain pattern cross cutting the through hole that multiple diameter is 3 millimeters at the back of the body insulating layer be made up of EVA film-1; Through hole on back of the body insulating barrier is aimed at and lamination (65 DEG C temperature 2.5 minutes) in copper conducting channel; Conducting resinl ECA-1 is filled in the through hole on back of the body insulating barrier; MWT battery is placed on the front face side of back of the body insulating barrier; Before being made up of another layer of EVA film-1, encapsulated layer is placed in the front face side of MWT battery; The header board be made up of glass plate is placed again on the opposite side of front encapsulated layer; Use Meier ICOLAMTM 10/08 laminating machine (German Meier Vakuumtechnik GmbH) to carry out laminated into typely reaching 15 minutes to the assembly obtained above under 145 DEG C and vacuum condition, thus obtain the final back-contact photovoltaic module comprising copper conducting channel.Adopt power output method of testing as above to test, result is: the power output of this back-contact photovoltaic module is 3.64 watts.
By having prepared with the method described in comparative example 1 the back-contact photovoltaic module comprising copper conducting channel, difference has been, back of the body insulating barrier is made up of EVA film-2, and the conducting resinl be full of in the through hole of back of the body insulating barrier is ECA-2.The power output comprising the back-contact photovoltaic module of copper conducting channel of gained is 3.66 watts thus.
By having prepared with the method described in comparative example 1 the back-contact photovoltaic module comprising aluminum conducting channel, difference is, copper conducting channel is replaced by the aluminum conducting channel be made up of aluminium foil-1, and to be full of in the through hole of back of the body insulating barrier be a combined conductive member.This conductive member comprises a conductive component adjacent with aluminum conducting channel, and it is the copper sheet (cutting from Copper Foil-2) of diameter 3 millimeters, thickness 105 microns.This conductive component also comprises electricity bonding parts, and it is made up of conducting resinl ECA-1, to riddle in through hole not by part that conductive component is filled.The power output comprising the back-contact photovoltaic module of copper conducting channel of gained is 0.93 watt thus.
Prepared the back-contact photovoltaic module comprising aluminum conducting channel of the present invention by the following method: nickel plating Copper Foil to be cut into multiple thickness be 50 micron diameters be 3 millimeters copper sheet and by its with certain pattern by 24 kHz, be ultrasonically bonded to the surface of one deck aluminium foil-2 under amplitude 20 microns of conditions; By the front face side (side that be welded with copper sheet dorsad substrate aluminium foil-2 on) of aluminium foil-2 vacuum lamination to substrate; Hand cut aluminium foil-2 thus mold the aluminum conducting channel with preset pattern; Go out with certain pattern cross cutting the through hole that multiple diameter is 3 millimeters at the back of the body insulating layer be made up of EVA film-1; Through hole on back of the body insulating barrier is aimed at the copper sheet in aluminum conducting channel and insulating barrier lamination (65 DEG C temperature 2.5 minutes) will be carried on the back in aluminum conducting channel; With conducting resinl ECA-2, through hot pressing and cross cutting, to obtain thickness be 400 micron diameters is the conducting resinl pad of 2.5 millimeters and is positioned in through hole (thus, copper sheet and conducting resinl pad together constitute the combined conductive member of the through hole be full of in back of the body insulating barrier, wherein adjacent with aluminum conducting channel copper sheet is conductive component, and conducting resinl pad is electricity bonding parts); MWT battery is placed on the front face side of back of the body insulating barrier; Before being made up of another layer of EVA film-1, encapsulated layer is placed in the front face side of MWT battery; The header board be made up of glass plate is placed again on the opposite side of front encapsulated layer; Use Meier ICOLAMTM 10/08 laminating machine (German Meier Vakuumtechnik GmbH) to carry out laminated into typely reaching 15 minutes to the assembly obtained above under 145 DEG C and vacuum condition, thus obtain the final back-contact photovoltaic module comprising aluminum conducting channel of the present invention.The power output of this back-contact photovoltaic module is 3.58 watts.
By having prepared the back-contact photovoltaic module comprising aluminum conducting channel of the present invention with the method described in example 1, difference is, aluminum conducting channel is obtained by aluminium foil-1, welding (welding condition: frequency 20kHz, amplitude 12 microns) to be 35 micron diameters be that the copper of 3 millimeters is obtained by Copper Foil-1 cutting for thickness in aluminum conducting channel, the part from conductive glue ECA-1 be not full of by copper sheet in through hole in back of the body insulating barrier be full of, the power output comprising the back-contact photovoltaic module of aluminum conducting channel of gained is 3.70 watts thus.
The power output comprising the back-contact photovoltaic module (comparative example 1 and 2) of copper conducting channel is 3.64 or 3.66 watts.When continuing to use back-contact photovoltaic module (namely substituting copper conducting channel by aluminum conducting channel) (comparative example 3) preparing the conventional method preparation comprising the back-contact photovoltaic module of copper conducting channel and comprise aluminum conducting channel, its power output declines to a great extent to 0.93.When the through hole adopting combined conductive member to be full of back of the body insulating barrier, and in combined conductive member by conductive component be welded in aluminum conducting channel by ultrasonic bonding time, the power output comprising the back-contact photovoltaic module (example 1 and 2) of aluminum conducting channel of the present invention obtained has brought up to 3.58 or 3.70 watts.
Although described above and particular instantiation some preferred embodiment of the present invention, be not intended to the present invention to be limited to this type of embodiment.In addition, be to be understood that, although shown many features and advantages of the present invention in the description above, and the details of this structure and function of the present invention, but the disclosure is only exemplary, and can not depart from the basis of the principle of the invention, in the extensive general intended scope according to term used in appended claims, details of the present invention is farthest revised, especially to the amendment of shape, size and arrangement of parts aspect.
2. integrated form backboard according to claim 1, it is characterized in that, one or more metal materials described are selected from the material group comprising copper, tin, nickel, titanium, silver-plated copper, nickel-clad copper, copper facing aluminium, tin-coated copper, gold-plated nickel, stainless steel and their alloy and combination.
3. integrated form backboard according to claim 1, is characterized in that, in described combined electric interconnecting member, described conductive component accounts for the 3-95 % of described combined electric interconnecting member cumulative volume.
4. integrated form backboard according to claim 1, is characterized in that, described electricity bonding parts are by comprising at least 5%(volumn concentration) the electric conducting material of macromolecular material make.
5. integrated form backboard according to claim 4, is characterized in that, described electricity bonding parts are made up of conducting polymer composite.
6. integrated form backboard according to claim 4, is characterized in that, described electricity bonding parts are made up of conducting resinl, and described conducting resinl comprises macromolecular material and dispersion conducting particles wherein.
7. integrated form backboard according to claim 6, is characterized in that, described conducting particles is selected from the group comprising gold, silver, nickel, copper, aluminium, tin, zinc, titanium, bismuth, tungsten, lead and alloy thereof.
8. integrated form backboard according to claim 1, is characterized in that, described back of the body insulating barrier is made up of one or more layers polymer film or plate.
9. integrated form backboard according to claim 8, it is characterized in that, at least one deck in described back of the body insulating barrier is made up of the polymer composition comprising ethylene-vinyl acetate copolymer (EVA), ionomer (ionomer) or poly-(vinyl butyral) (PVB).
10. integrated form backboard according to claim 1, is characterized in that, the thickness of described aluminum conducting channel is at 30-250 micron.
The integrated form backboard comprising aluminum conducting channel according to any one of claim 1-10;
12. back-contact photovoltaic modules according to claim 11, is characterized in that, described back-contact barrier-layer cell is run through through metallization the barrier-layer cell being wound around process (MWT).
CN201310642495.3A 2013-12-04 2013-12-04 Integrated backboard including aluminum conductive circuit, and back contact type photovoltaic module CN104701401B (en)
CN201310642495.3A CN104701401B (en) 2013-12-04 2013-12-04 Integrated backboard including aluminum conductive circuit, and back contact type photovoltaic module
US14/560,369 US20150155399A1 (en) 2013-12-04 2014-12-04 Integrated back sheet with an aluminum conductive circuit and back-contact photovoltaic module
CN104701401A true CN104701401A (en) 2015-06-10
CN104701401B CN104701401B (en) 2017-05-24
ID=53266016
US (1) US20150155399A1 (en)
CN (1) CN104701401B (en)
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2014-12-04 US US14/560,369 patent/US20150155399A1/en not_active Abandoned
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