CN106206767B - Solar battery cell, battery chip arrays, battery component and preparation method thereof - Google Patents

Solar battery cell, battery chip arrays, battery component and preparation method thereof Download PDF

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Publication number
CN106206767B
CN106206767B CN201510219366.2A CN201510219366A CN106206767B CN 106206767 B CN106206767 B CN 106206767B CN 201510219366 A CN201510219366 A CN 201510219366A CN 106206767 B CN106206767 B CN 106206767B
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China
Prior art keywords
wire
cell piece
grid line
cell
solar battery
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CN201510219366.2A
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Chinese (zh)
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CN106206767A (en
Inventor
赵志强
姜占锋
何龙
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BYD Co Ltd
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BYD Co Ltd
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Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to US14/738,409 priority Critical patent/US10529868B2/en
Priority to US14/738,322 priority patent/US20160126372A1/en
Priority to US14/738,637 priority patent/US20160126373A1/en
Priority to US14/738,664 priority patent/US20160126390A1/en
Priority to US14/738,516 priority patent/US20160126389A1/en
Priority to US14/738,578 priority patent/US10069019B2/en
Priority to US14/738,244 priority patent/US20160126361A1/en
Priority to US14/738,390 priority patent/US20160126363A1/en
Priority to US14/738,587 priority patent/US10193003B2/en
Priority to US14/738,368 priority patent/US20160126388A1/en
Priority to US14/738,677 priority patent/US10381493B2/en
Priority to PCT/CN2015/084106 priority patent/WO2016065952A1/en
Priority to US14/928,863 priority patent/US20160126391A1/en
Publication of CN106206767A publication Critical patent/CN106206767A/en
Publication of CN106206767B publication Critical patent/CN106206767B/en
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    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

Abstract

This application discloses the preparation methods of a kind of solar battery cell, solar battery chip arrays, solar cell module and solar cell module, solar battery cell includes: cell piece, and cell piece includes battery sheet matrix and the secondary grid line that is located on the front of battery sheet matrix；Conductor wire, conductor wire intersect with secondary grid line and weld with secondary grid line, and width of the secondary grid line in the welding position with conductive wire bonding is greater than secondary grid line in the width of non-solder position.According to the solar battery cell of the embodiment of the present application, by the way that secondary grid line is widened at the position with conductive wire bonding, other position relative narrowers, so that conductor wire and secondary grid line welding are simpler, the welding between secondary grid line is very secured, and welding position is easy to manufacture relatively, reduce preparation cost, while improving the bonding strength of conductor wire and secondary grid line, shading-area is also reduced, the photoelectric conversion efficiency of solar battery sheet is improved.

Description

Solar battery cell, battery chip arrays, battery component and preparation method thereof
Technical field
This application involves area of solar cell, more particularly to solar battery cell, solar battery chip arrays, too Positive energy battery component and preparation method thereof.
Background technique
Solar cell module is one of important component of device of solar generating, generally by multiple battery units with square The form of battle array is constituted.For sunlight from the front illuminated to cell piece of cell piece, cell piece generates overcurrent by photoelectric effect. Since cell piece includes battery sheet matrix and the main gate line being printed on cell piece front side of matrix and secondary grid line, then pass through covering The welding extracted current being welded in main gate line, welding, main gate line and secondary grid line can cover positive one of battery sheet matrix Point, a part of sunlight thus can be blocked, the solar energy impinged upon on welding, main gate line and secondary grid line can not be transformed into electric energy, Therefore, it is necessary to welding, main gate line and secondary grid line are more thinner better.However, the effect of welding, main gate line and secondary grid line is to conduct electricity Stream, from the point of view of resistivity, welding, main gate line and secondary grid line get over that detailed rules and regulations conduction cross-sectional area is smaller, and ohmic loss is bigger.Cause The design needs of this welding, main gate line and secondary grid line obtain balance between shading and conduction, while to consider cost.
Summary of the invention
The application is to be made based on applicant to the discovery of following facts and problem and understanding:
In the related technology, the front of solar battery sheet is usually provided with main gate line and secondary grid line, for exporting cell piece Pass through electric current caused by photoelectric effect or photochemical effect.In order to improve the efficiency of cell piece, current solar battery Manufacturer all is being dedicated to studying the quantity for how improving main gate line.Main grid is successfully increased to 3 from 2 in the prior art Root, or even improve to 5.
But in the prior art, main gate line is prepared by the slurry that printing main component is expensive silver , therefore, preparation cost is very high, and the radical for increasing silver-colored main gate line necessarily leads to the increase of cost.Meanwhile existing silver master The width of grid line is big (for example, width reaches 2mm or more), and the radical for increasing silver-colored main gate line can also increase to shading-area, leads to electricity The transfer efficiency of pond piece reduces.
Therefore, from cost is reduced, the angle for reducing shading-area is set out, and will be printed on cell piece originally in the related technology Silver-colored main gate line replace with wire, such as copper wire, welded by copper wire and secondary grid line, and then copper wire is electric as conductor wire export Stream.Due to not using silver-colored main gate line, cost can be greatly reduced, simultaneously because the diameter of copper wire is smaller, can reduce screening Therefore light area can further promote the quantity of conductor wire to 10.This cell piece is properly termed as dereliction grid cell Piece, wherein silver main gate line and welding in conventional solar cell piece is substituted in wire.
Present inventor tests discovery by long-term research, if use while pulling out more parallel metals Silk, then cuts more one metal wires, then more one metal wires are fixedly welded to cell piece simultaneously.Such mode is due to equipment And the limitation of preparation precision, technique etc., such as due to the effect of stress, when solar battery sheet is placed in a free state, be Have certain curved, it is therefore desirable to which the rate of tension that wire keeps certain could flatten cell piece (it is demonstrated experimentally that string diameter For the copper wire of 0.2mm, minimum tensile force will at least have 2N).To keep the tensile force, need to set at every one metal wire both ends The device of similar clip is set, which needs to occupy certain space, and the space of cell piece is limited, therefore, existing skill The wire that at most can only pull out and be fixedly welded simultaneously at present 10 or so in art on a cell piece, is further added by wire Radical it is extremely difficult.Because wire radical is more, free end is more, and equipment needs while controlling more wires, This requires wire-drawing equipment very high.Meanwhile the space of solar battery sheet is limited, for example, the size of general single battery piece is 156mm*156mm needs accurately to control more one metal wires simultaneously in such limited space, this is very high to equipment requirement, especially It is very high to required precision.Therefore in current actual production, can not preferably while control and weld more gold Belonging to silk, the radical for capableing of increased conductor wire is still limited, and general at most only 10 or so, and realize difficult.
In order to solve this problem, the prior art (US20100275976 and US20100043863) proposes one kind The technical solution more one metal wires being fixed on transparent film layer.That is, first by more parallel wires by way of bonding It is fixed on transparent film layer, then fits to the hyaline membrane for being bonded with more parallel wires on cell piece, finally by Laminating technology contacts wire with the secondary grid line on cell piece.The program is solved by the fixed more one metal wires of transparent film layer The problem of controlling more one metal wires simultaneously, can further increase the radical of wire, but this scheme has almost abandoned weldering Technique is connect, i.e. wire is not connect by welding procedure with secondary grid line, makes wire and secondary grid by laminating technology Line is in contact, thus derived current.
Although this scheme can further promote the radical of wire, due to the presence of transparent film layer, it will affect light Absorption, certain shading is caused, so as to cause the reduction of transfer efficiency.
Importantly, this scheme using the fixed wire of transparent film layer is can not to connect metal using welding procedure Silk and secondary grid line.This is because, on the one hand, if the fusion temperature of transparent film layer has to be higher than weldering using welding procedure Jointing temp (welding temperature is generally at 140 DEG C or so).Otherwise, it if the fusion temperature of transparent film layer is lower than welding temperature, is welding When connecing, adhesive film can melt, to lose its effect for fixing wire, wire can drift about, and substantially reduce weldering Connect effect.However, on the other hand, well known to those skilled in the art, solar battery sheet is needed when in use in sealing state, To prevent water, air etc. from entering in cell piece, cause to generate burn into short circuit etc.；And existing encapsulating material is generally EVA, Fusing point is generally 70-80 DEG C, well below welding temperature；If using welding procedure, as described above, the fusing of transparent film layer Temperature need be higher than welding temperature, certainty also above encapsulating material fusing point, therefore encapsulation when, in package temperature Under, encapsulating material (EVA) melts, and transparent film layer will not melt, thus, when packaged, the encapsulating material of fusing It is that can not penetrate the adhesive film of solid, so that cell piece is fully sealed, therefore, sealing effect is excessively poor, practical to produce Product are easy to fail.Therefore, for the angle of encapsulation, and need the fusion temperature of transparent film layer lower than welding temperature, this is aobvious It is so an antinomy.
Therefore, this scheme using the fixed wire of adhesive film is that welding procedure can not be used wire and secondary grid line Weld together, secondary grid line contact of the wire only actually only and on cell piece, that is, wire is only taken On secondary grid line.Therefore, the bonding strength of wire and secondary grid line is very low, in lamination process or in use process, gold Belong to and be very easy to be detached between silk and secondary grid line, causes poor contact, be greatly lowered so as to cause the efficiency of cell piece, Even fail.Therefore, it is not really promoted and is commercialized using the product of this scheme.Therefore, currently on the market simultaneously Not mature dereliction grid solar cell.
Meanwhile in existing dereliction grid solar cell, since conductor wire is the very small wire of diameter, with pair Grid line welding is more difficult, when being easy to produce rosin joint, poor contact, and weld, since wire needs to keep certain Rate of tension, i.e. wire needs in linear state, and wire can have certain internal stress, so that wire is welding Phenomena such as Cheng Hou is easy to appear and falls off, desoldering is greatly lowered so as to cause the efficiency of cell piece, even fails.
The application is intended to solve one of above-mentioned technical problem at least to a certain extent.
More main grid solar batteries that the application proposes can be commercialized, and prepare simple easily realization, especially at low cost, if It is standby simple, it can produce in batches.
For this purpose, the application proposes a kind of solar battery cell, which is simple to manufacture, is at low cost, light Photoelectric transformation efficiency is high
The application also proposes a kind of solar battery chip arrays, which is simple to manufacture, is at low cost, light Photoelectric transformation efficiency is high.
The application also proposes a kind of solar cell module with above-mentioned solar battery chip arrays, the solar battery Component is simple to manufacture, is at low cost, and photoelectric conversion efficiency is high.
The application also proposes a kind of preparation method of above-mentioned solar cell module.
Present inventor tests discovery by long-term research, when the secondary grid line on wire and battery sheet matrix welds When connecing, because wire is thinner, there are the welding between biggish stress, with secondary grid line and insecure, after placing a period of time, Less than one month, wire can burst apart and fall off, and such cell piece is caused not to be available, while secondary grid line further relates to shading surface, Therefore the absorption efficiency for influencing light brings obstacle to the development of this technology.
According to the solar battery cell of the application first aspect embodiment, comprising: cell piece, the cell piece include electricity Pond sheet matrix and the secondary grid line being located on the front of the battery sheet matrix；Conductor wire, the conductor wire and the secondary grid line phase It hands over and is welded with the secondary grid line, the pair grid line is equipped with weld part, the weldering in the welding position with the conductive wire bonding The combination that is projected as round, ellipse, polygon or above-mentioned shape of the socket part on the battery sheet matrix, the weld part The area of projection is greater than that the length on the length direction of the secondary grid line is equal with the weld part and pair in non-solder position The area of the projection of grid line section.
According to the solar battery cell of the embodiment of the present application, by the way that secondary grid line is arranged with the position of conductive wire bonding Weld part, and the area of the projection of weld part is greater than on the length direction of secondary grid line and the non-weldering of the equal length of weld part The bonding area of the area of the projection of socket part, weld part and conductor wire is bigger, and conductor wire and secondary grid line welding are simpler, with pair Welding between grid line is very secured, and welding position is easy to manufacture relatively, reduces preparation cost.In addition, improving While the bonding strength of conductor wire and secondary grid line, the solar battery cell of the embodiment of the present application need to only need on secondary grid line The position of welding carries out widening treatment, and therefore, the position for not needing to weld on secondary grid line can further be done thinner, thus It can be further reduced shading-area, improve the photoelectric conversion efficiency of solar battery sheet.
According to the solar battery chip arrays of the application second aspect embodiment, including multiple solar battery cells, institute Solar battery cell is stated for the solar battery cell according to above-described embodiment, between the cell piece of adjacent cell It is connected by the conductor wire.
According to the solar cell module of the application third aspect embodiment, including upper cover plate, the front glue being sequentially stacked Film layer, battery chip arrays, back side adhesive film and backboard, the battery chip arrays are the solar-electricity according to above-described embodiment Pond chip arrays.
According to the preparation method of the solar cell module of the application fourth aspect embodiment, comprising: provide cell piece, institute State the secondary grid line that cell piece includes battery sheet matrix He is located on the front of the battery sheet matrix；It is led what is be made of wire Electric wire and the secondary grid line welding are to obtain solar battery cell, wherein the pair grid line is in the weldering with the conductive wire bonding Position is connect equipped with weld part, the weld part is projected as round, ellipse, polygon or above-mentioned on the battery sheet matrix The combination of shape, the area of the projection of the weld part are greater than length and the weld part on the length direction of the secondary grid line The area of the projection of secondary grid line section equal and in non-solder position；By upper cover plate, front adhesive film, the solar battery list Member, back side adhesive film and backboard successively stack, and make the front of the solar battery sheet in face of front adhesive film, make it is described too The back side of positive energy cell piece faces back side adhesive film, is then laminated to obtain the solar cell module.
Detailed description of the invention
Above-mentioned and/or additional aspect of the invention and advantage will become from the description of the embodiment in conjunction with the following figures Obviously and it is readily appreciated that, in which:
Fig. 1 is the floor map according to the solar battery chip arrays of the application one embodiment.
Fig. 2 is longitudinal schematic cross-section according to the solar battery chip arrays of the application one embodiment.
Fig. 3 is the lateral schematic cross-section according to the solar battery chip arrays of the application one embodiment.
Fig. 4 is the schematic diagram according to the wire for being used to form conductor wire of the embodiment of the present application.
Fig. 5 is the floor map according to the solar battery chip arrays of another embodiment of the application.
Fig. 6 is the floor map according to the solar battery chip arrays of the another embodiment of the application.
Fig. 7 is the schematic diagram according to the reciprocation extension of the wire of the embodiment of the present application.
Fig. 8 is the schematic diagram according to two cell pieces of the solar battery chip arrays of the embodiment of the present application.
Fig. 9 is two cell pieces shown in Fig. 8 to be formed by connecting the schematic diagrames of solar battery chip arrays by wire.
Figure 10 is the schematic diagram according to the solar cell module of the embodiment of the present application.
Figure 11 is the schematic partial cross-sectional view of solar cell module shown in Figure 10.
Figure 12 is the schematic diagram according to the solar battery chip arrays of the application another embodiment.
Figure 13 is the structural schematic diagram according to the secondary grid line of the solar battery sheet of the application one embodiment.
Appended drawing reference:
Cell piece component 100；
Upper cover plate 10；
Front adhesive film 20；
Battery chip arrays 30；Cell piece 31；First cell piece 31A；Second cell piece 31B；Battery sheet matrix 311；Secondary grid Line 312；Positive pair grid line 312A；Back side pair grid line 312B；Weld part 3123；Carry on the back electric field 313；Back electrode 314；
Conductor wire 32；Front side conductive line 32A；Back side conductor wire 32B；Wire 321；Welding layer 322；Short grid line 33；
Back side adhesive film 40；
Lower cover plate 50.
Specific embodiment
The embodiment of the present invention is described below in detail, examples of the embodiments are shown in the accompanying drawings, wherein from beginning to end Same or similar label indicates same or similar element or element with the same or similar functions.Below with reference to attached The embodiment of figure description is exemplary, it is intended to is used to explain the present invention, and is not considered as limiting the invention.
In this application, in order to more understand and be convenient for description, part term is explained below.
Term " battery unit " includes cell piece 31 and conductor wire 32, and conductor wire 32 is referred to as battery unit as a result, Conductor wire 32.
Term " cell piece 31 " includes battery sheet matrix 311, the secondary grid line 312 being located on 311 front of battery sheet matrix, sets Back electric field 313 at the back side of battery sheet matrix 311 and the back electrode 314 that is located on back electric field 313, as a result, secondary grid line 312 It is properly termed as the secondary grid line 312 of cell piece 31, back electric field 313 is referred to as the back electric field 313 of cell piece 31, back electrode 314 It is referred to as the back electrode 314 of cell piece 31.
" battery sheet matrix 311 " is such as can be as silicon wafer through process making herbs into wool, diffusion, etching edge, deposited silicon nitride layer The intermediate products obtained afterwards, it should be understood that battery sheet matrix 311 is not limited to be made of silicon wafer in the application.
In other words, cell piece 31 includes silicon wafer, to some process layers of silicon chip surface, the secondary grid line of light-receiving surface and shady face Back electric field 313 and back electrode 314 or equivalent not front electrode other class solar batteries.
In this application, cell piece, cell piece 31 and battery sheet matrix 311 are intended merely to facilitate description, and cannot manage Solution is the limitation to the application.
" solar battery chip arrays 30 " are arranged by multiple cell pieces, in other words, pass through conductor wire 32 by multiple Connected cell piece 31 arranges.
In solar battery chip arrays 30, wire 321 constitutes the conductor wire 32 of battery unit, and wire 321 extends Should broadly understood between the surface of adjacent cell piece 31, wire 321 can extend in adjacent cell piece 31 surface it Between, wire 321 can be connected with the secondary grid line 312 of cell piece 31 or wire 321 and in adjacent cell piece 31 The secondary grid line 312 of one cell piece 31 be connected with the back electrode 314 of another cell piece 31 or a part of wire 321 with The secondary grid line 312 of cell piece 31 is connected, remaining wire 321 is connected with the back electrode 314 of cell piece 31 simultaneously.
In other words, wire 321 can extend between the front of adjacent cell piece 31, also can extend in adjacent cell Between the front of a cell piece 31 and the back side of another cell piece 31 in piece 31.Adjacent electricity is extended in wire 321 When between the front of a cell piece 31 and the back side of another cell piece 31 in pond piece 31, conductor wire 32 may include extending The front side conductive line 32A being electrically connected on the front of cell piece 31 and with the secondary grid line 312 of cell piece 31, and extend in battery The back side conductor wire 32B being electrically connected on the back side of piece 31 and with the back electrode of cell piece 31 314, wire 321 are located at adjacent electricity Part between pond piece 31 is properly termed as connection conductor wire.
All ranges disclosed in this application all include endpoint and can independently combine.Model disclosed herein The endpoint and any value enclosed is not limited to the accurate range or value, these ranges or value should be understood as including close to these models It encloses or the value of value.
In this application, unless otherwise indicated, directional terminology such as " upper and lower " typically refers to shown in the drawings upper and lower；" just Face " refers to solar cell module in application process towards the one side of light namely light-receiving surface；" back side " refers to solar-electricity Pond component is in application process back to the one side of light.
Solar battery sheet according to the embodiment of the present application is described below.
It as shown in figure 1 to figure 13, include cell piece 31 and conductor wire according to the solar battery cell of the embodiment of the present application 32.Cell piece 31 includes battery sheet matrix 311 and the secondary grid line 312 that is located on the front of battery sheet matrix 311, conductor wire 32 with Secondary grid line 312 intersects and welds with secondary grid line 312, and secondary grid line 312 is equipped with weld part in the welding position welded with conductor wire 32 3123, the combination that is projected as round, ellipse, polygon or above-mentioned shape of the weld part 3123 on battery sheet matrix 311, weldering It is equal with weld part 3123 and in non-solder that the area of the projection of socket part 3123 is greater than the length on the length direction of secondary grid line 312 The area of the projection of the secondary grid line section of position.
In other words, it is mainly made of cell piece 31 and conductor wire 32 according to the solar battery sheet of the application, cell piece 31 Then mainly it is made of battery sheet matrix 311 and secondary grid line 312, it in this application, will be to be located at the positive of battery sheet matrix 311 It is described in detail for secondary grid line 312.
Specifically, secondary grid line 312 is located at the front of battery sheet matrix 311 and extends in one direction, and conductor wire 32 is located at The top of secondary grid line 312 and extend along another direction, conductor wire 32 and secondary grid line 312 are at the position of intersection by welding phase Even, the line width of conductor wire 32 is typically larger than the line width of secondary grid line 312, and secondary grid line 312 is arranged at the position welded with conductor wire 32 Weld part 3123, secondary grid line 312 are weldingly connected by weld part 3123 with conductor wire 32.
Wherein, projection of the weld part 3123 on battery sheet matrix 311 can be round, ellipse, polygon or above-mentioned The combination of shape, and on the length direction of secondary grid line 312, the area ratio of the projection of the weld part 3123 of equal length is identical The area of the projection in the non-solder portion of length is big.
That is, as shown in figure 13, the size on secondary grid line 312 with 32 welding position of conductor wire has carried out at increase Reason, i.e., the area of weld part 3123 has carried out increase processing, it is possible thereby to which secondary grid line 312 and conductor wire 32 is made to have bigger weldering Junction product, so as to improve the peel strength of solder joint.
As a result, according to the solar battery sheet of the embodiment of the present application, by the way that secondary grid line 312 is being welded with conductor wire 32 Weld part 3123 is set, and the area of the projection of weld part 3123 is greater than on the length direction of secondary grid line 312 and weld part The area of the projection in the non-solder portion of 3123 equal length, weld part 3123 and the bonding area of conductor wire 32 are bigger, conductive Line 32 and the secondary welding of grid line 312 are simpler, and weld part 3123 is easy to manufacture relatively, is reduced preparation cost, is being mentioned While the bonding strength of highly conductive line 32 and secondary grid line 312, shading-area is also reduced, the light of solar battery sheet is improved Photoelectric transformation efficiency.
In some specific embodiments of the application, the area of the projection of single weld part 3123 is in 0.005 square of milli - 1 square millimeter of rice.Preferably, the area of the projection of single weld part 3123 can be at 0.01 square millimeter -0.2 square millimeter Between.
As a result, within the above range by the area setting of single weld part 3123, the weldering with conductor wire 32 both can be improved Intensity is connect, to improve the peel strength of solder joint, and can be with reasonable control cost.
Preferably, in some instances, as shown in figure 13, projection of the weld part 3123 on battery sheet matrix 311 can be with Be formed as rectangle, i.e., on the length direction of secondary grid line 312, the width of weld part 3123 is greater than other positions of secondary grid line 312 Width.
That is, the line width carry out widening treatment of secondary grid line 312 in the position intersected with conductor wire 32, secondary grid line The position on 312 is used to be welded with conductor wire 32 as weld part 3123, by the weld part 3123 on secondary grid line 312 into Row widening treatment, can in order to which secondary grid line 312 is welded with conductor wire 32, meanwhile, other positions of secondary grid line 312 can be kept Former line width, or even line width is reduced, while guaranteeing the welding effect of secondary grid line 312 and conductor wire 32, shading can also be reduced Area.
As a result, according to the solar battery sheet of the embodiment of the present application, by the way that secondary grid line 312 is being welded with conductor wire 32 Position is widened, other position relative narrowers, so that conductor wire 32 and the secondary welding of grid line 312 are simpler, and welding position is opposite It is easy to manufacture, reduces preparation cost, while improving the bonding strength of conductor wire 32 and secondary grid line 312, also reduce Shading-area improves the photoelectric conversion efficiency of solar battery sheet.
In some embodiments of the present application, conductor wire 32 is made of wire 321.In some embodiments it may be preferred that Wire 321 is copper wire, but the application is not limited to this, such as wire 321 or aluminium wire.Preferably, wire 321 With circular cross section, more sunlights can be irradiated on battery sheet matrix as a result, further increase photoelectric conversion effect Rate.
Further, wire 321 is at least coated with welding layer, conductor wire 32 on the part welded with secondary grid line 312 It is welded by welding layer and secondary grid line 312.
It is highly preferred that wire passes through the welding of cladding as shown in figure 4, being coated with welding layer 322 outside wire 321 Layer is welded with secondary grid line and/or back electrode.It is electrically connected as a result, convenient for wire 321 with pair grid line 312, avoids connection procedure Middle wire drifts about and influences photoelectric conversion efficiency.Certainly, wire 321 can be in solar-electricity with being electrically connected for cell piece 31 It carries out, can also carry out before being laminated, it is preferable that be attached in the lamination process of pond component before being laminated.
In other embodiments of the application, secondary grid line 312 is equipped with welding layer, and conductor wire 32 passes through welding layer and pair Grid line 312 welds.
That is, the welding of conductor wire 32 and secondary grid line 312 can be by being arranged welding layer on conductor wire 32 come real It is existing, it can also be realized by the way that welding layer is arranged on secondary grid line 312.When welding layer is located on secondary grid line 312, usually only exist Welding layer is set on the pad of secondary grid line 312.As a result, while guaranteeing the welding effect of conductor wire 32 and secondary grid line 312, It can guarantee photoelectric conversion efficiency to avoid the influence to shading-area.
According to one embodiment of the application, width of the secondary grid line 312 at welding position is 0.08 millimeter of -0.24 milli Rice, width of the secondary grid line 312 in non-solder position is 0.015 millimeter -0.03 millimeter, and the width of secondary grid line 312 is secondary grid line 312 Full-size on the direction of length direction for being orthogonal to secondary grid line 312.
Specifically, in the present embodiment, secondary grid line 312 is (as shown in figure 13) vertically extended, conductor wire 32 Then extend in left-right direction, conductor wire 32 intersects vertically with secondary grid line 312.Wherein, the width of secondary grid line 312 refers to secondary grid The width of the size of line 312 in the lateral direction, the weld part 3123 on secondary grid line 312 also refers to weld part 3123 in right and left Upward width.
In the present embodiment, the width of the weld part 3123 on secondary grid line 312 is 0.08 millimeter -0.24 millimeter, and secondary grid The width at remaining position of line 312 is then 0.015 millimeter -0.03 millimeter.The secondary grid line 312 of the structure can increase list as a result, The area of a weld part 3123, to improve the peel strength of weld part 3123, and the opposite entirety for reducing secondary grid line 312 Shading-area, while the dosage of silver is reduced, photoelectric conversion efficiency is not only improved, but also reduce costs.
Optionally, in other specific embodiments of the application, height of the secondary grid line 312 at welding position is than secondary Height of the grid line 312 at non-solder position is high.Preferably, height of the secondary grid line 312 in welding position is 0.01 millimeter -0.03 Millimeter, height of the secondary grid line 312 in non-solder position is 0.005 millimeter -0.01 millimeter.
That is, in this application, secondary grid line 312 not only increases bonding area at weld part 3123, but also Increase thickness.The secondary grid line 312 of the structure can be further improved the connective stability with conductor wire 32 as a result, guarantee weldering Quality is connect, to improve the peel strength of conductor wire 32.
In some examples of the application, the quantity of the weld part 3123 on single pair grid line 312 is 6-60.It is preferred that The quantity on ground, the weld part 3123 on single pair grid line 312 is 15-36.
As shown in figure 13, that is to say, that on a battery sheet matrix 311, single pair grid line 312 is in its longitudinal direction 6-60 weld part 3123 can be set, preferably 15-36, then correspondingly, 6-60 root can be equipped on the cell piece 31 Conductor wire 32, preferably 15-36 root.
Thus, it is possible to guarantee conductor wire 32 when being weldingly connected with each secondary grid line 312, can by with weld part 3123 welding further improve the welding stability of conductor wire 32 and secondary grid line 312 to realize.
In some specific embodiments of the application, the quantity of secondary grid line 312 is 20-200 root.Preferably, secondary grid line 312 quantity is 30-120 root.
Solar battery chip arrays 30 according to the embodiment of the present application are described below.
It include multiple solar battery cells, solar battery according to the solar battery chip arrays 30 of the embodiment of the present application Unit is the solar battery cell according to above-described embodiment, is passed through between the cell piece 31 of adjacent solar battery unit Conductor wire 32 is connected.
Due to being had above-mentioned technique effect according to the solar battery cell of the above embodiments of the present application, according to this Apply for that the solar battery chip arrays 30 of embodiment also have corresponding technical effect, the i.e. secondary grid of conductor wire 32 and cell piece 31 The welding of line 312 is simpler, and welding position is easy to manufacture relatively, reduces preparation cost, is improving conductor wire 32 and pair While the bonding strength of grid line 312, shading-area is also reduced, improves the photoelectric conversion efficiency of solar battery sheet.
Specifically, in some embodiments of the application, conductor wire 32 is made of wire 321, and wire 321 is in adjacent electricity Reciprocation extension between the surface of a cell piece 31 and the surface of another cell piece 31 in pond piece 31.
Here, cell piece 31 is constituted with the conductor wire 32 being made of the wire 321 extended on 31 surface of cell piece In other words cell piece is made of according to the solar battery chip arrays 30 of the embodiment of the present application multiple battery units, multiple batteries The conductor wire 32 of unit is made of wire 321 of the reciprocation extension on the surface of cell piece 31.
It is to be appreciated that in this application, term " reciprocation extension " is referred to as " coiling ", it can refer to wire 321 extend between the surface of cell piece 31 along reciprocal stroke.
In this application, " surface of a cell piece 31 of the wire 321 in adjacent cell piece 31 and another battery Reciprocation extension between the surface of piece 31 " should broadly understood, for example, wire 321 can be with reciprocation extension in adjacent cell piece 31 In the surface of a cell piece 31 and the surface of another cell piece 31 between, wire 321 can also be from first battery The surface of piece 31 extends through 31 surface of intermediate cell piece to the surface of the last one cell piece 31 of predetermined quantity, then from most The surface of the latter cell piece 31 returns to and extends through the surface of the intermediate cell piece 31 of the predetermined quantity to first electricity The surface of pond piece 31 so repeats.
In addition, when cell piece 31 is in parallel by wire 321, wire 321 can with reciprocation extension cell piece just On face, in the case, wire 321 constitutes the front side conductive line 32A of cell piece, and optionally, 321 reciprocation extension of wire exists On the front of cell piece 31 and different 321 reciprocation extensions of wire is on the back side of cell piece 31, in the case, extends in Wire 321 on 31 front of cell piece constitutes front side conductive line 32A, extends in 321 structure of wire at the back side of cell piece 31 At back side conductor wire 32B.
When cell piece 31 is one another in series by wire 321,321 reciprocation extension of wire is in adjacent cell piece 31 Between the front of one cell piece 31 and the back side of another cell piece 31, in the case, wire 321 is in a cell piece The part extended on 31 front constitutes front side conductive line 32A, and wire 321 prolongs on the back side of another adjacent cell piece 31 The part stretched constitutes back side conductor wire 32B.In this application, unless expressly stated otherwise, conductor wire 32 can be understood as front Conductor wire 32A, back side conductor wire 32B or front side conductive line 32A and back side conductor wire 32B.
Here, term " reciprocation extension " can be understood as the extension of wire 321 " one is reciprocal " and form two conductor wires 32, Since the reciprocal coiling of wire 321 forms U-shaped structure or v-shaped structure between two conductor wires 32, but the application is not It is limited to this.
According to the battery chip arrays 30 of the embodiment of the present application, the conductor wires 32 of multiple cell pieces by reciprocation extension wire 321 are constituted, and are connected between adjacent cell piece 31 by conductor wire 32, and therefore, the solar battery cell of the application uses 32 extracted current of conductor wire made of wire is printed as main gate line extracted current without using expensive silver paste, and Manufacturing process is simple, connects cell piece, wire 321 and the secondary grid line 312 of cell piece and the company of back electrode without using welding It connects conveniently, the cost of cell piece substantially reduces.
Further, since conductor wire 32 is made of the wire 321 of reciprocation extension, (i.e. wire exists the width of conductor wire 32 The width of projection on cell piece) it is far smaller than the width for the main gate line that existing printing silver paste is formed, shading-area is reduced, Moreover, the quantity of conductor wire 32 adjusts in which can be convenient, compared with the main gate line that silver paste is formed, the resistance of conductor wire 32 reduces, Improve photoelectric conversion efficiency.Since 321 reciprocation extension of wire forms conductor wire, the sun is being manufactured using battery chip arrays 30 When energy battery component 100, wire 321 is easier accurate control, is not easy to shift, i.e., wire is less likely to occur " to drift about ", no It will affect photoelectric conversion efficiency, further improve photoelectric conversion efficiency.
Therefore, at low cost, photoelectric conversion efficiency is high according to the solar battery chip arrays 30 of the embodiment of the present application.
Below with reference to the accompanying drawings solar battery chip arrays 30 according to the application specific embodiment are described.
With reference to Fig. 1-3 description according to the solar battery chip arrays 30 of one specific embodiment of the application.
In the embodiment shown in Fig. 1-3, two battery units of solar battery chip arrays 30 are shown, in other words, Show two cell pieces 31 being connected with each other by the conductor wire 32 being made of wire 321.
It is understood that cell piece 31 includes battery sheet matrix 311, the pair being located on the front of battery sheet matrix 311 Grid line 312 (i.e. positive pair grid line 312A), the back electric field 313 being located on the back side of battery sheet matrix 311 and is located at and carries on the back electric field 313 On back electrode 314.In this application, it is to be understood that unless expressly stated otherwise, back electrode 314 can be tradition electricity The back electrode of pond piece, such as printed and formed by silver paste, it is also possible to the back side for the secondary grid line being similar on cell piece front side of matrix Secondary grid line 312B, or discrete multiple weld parts, in this application, unless expressly stated otherwise, secondary grid line refers to electricity Secondary grid line 312 on the front of pond sheet matrix 311.
Specifically, in one embodiment of the application, front and another electricity of the wire 321 in a cell piece 31 Reciprocation extension between the back side of pond piece 31.
As shown in Figure 1-3, in this embodiment, solar battery chip arrays include two cell pieces 31A, 31B (in order to retouch State conveniently, referred to herein as the first cell piece 31A, the second cell piece 31B), 321 reciprocation extension of wire is in the first cell piece 31A Front (light-receiving surface, the upper surface in Fig. 2) and the back side of the second cell piece 31B between, wire 321 constitutes as a result, One front side conductive line 32A and back side conductor wire 32B, wire 321 are electrically connected with the secondary grid line of the first cell piece 31A and with The back electrode of two cell piece 31B is electrically connected.
In one embodiment of the application, the back side of battery sheet matrix 311 is equipped with back electrode 314, wire 321 and back Electrode 314 is weldingly connected.
That is, in this embodiment, the front of battery sheet matrix 311 is equipped with the secondary grid line 312A in front, the cell piece The back side of matrix 311 is equipped with back electrode 314, when conductor wire 32 is located at the front of battery sheet matrix 311, conductor wire 32 and front pair Grid line 312A is weldingly connected, when conductor wire 32 is located at the back side of battery sheet matrix 311, then with the back of the battery sheet matrix 311 The back electrode 314 in face is weldingly connected.
In some embodiments, wire 321 is one, and wire 321 is in the first cell piece 31A and the second cell piece Reciprocation extension 10-60 times between 31B, it is preferable that as shown in Figure 1, wire reciprocation extension 12 times to form 24 conductor wires, And wire be it is single, in other words, 24 conductor wires of single metal wire reciprocation extension 12 times formation, between adjacent conductive line between Away from can be 2.5 millimeters -15 millimeters.According to this embodiment, compared with the main gate line of conventional batteries piece, quantity increases, to subtract Small distance of the electric current from secondary grid line to conductor wire, reduces resistance, improves incident photon-to-electron conversion efficiency.Implementation shown in Fig. 1 In example, adjacent conductive line forms U-shaped structure, is thus convenient for the coiling of wire.Optionally, the application is not limited to this, for example, Adjacent conductive line can also form v-shaped structure.
In some embodiments it may be preferred that wire 321 is copper wire, but the application is not limited to this, such as wire 321 may be aluminium wire.Preferably, wire 321 has circular cross section, and more sunlights can be irradiated to electricity as a result, On the sheet matrix of pond, photoelectric conversion efficiency is further increased.
It is highly preferred that wire passes through the welding of cladding as shown in figure 4, being coated with welding layer 322 outside wire 321 Layer is welded with secondary grid line and/or back electrode, and being electrically connected convenient for wire and pair grid line and/or back electrode, avoids connecting as a result, Wire drifts about and influences photoelectric conversion efficiency in the process.Certainly, wire can be in solar-electricity with being electrically connected for cell piece It carries out, can also carry out before being laminated, it is preferable that be attached in the lamination process of pond component before being laminated.
In some embodiments it may be preferred that wire prolongs in a tensioned state before wire is contacted with cell piece It stretches, i.e., wire is straightened, after the secondary grid line and back electrode with cell piece are connect, the tensile force of wire can be discharged, Thus the conductor wire when preparing solar cell module is further avoided to drift about and influence photoelectric conversion efficiency.
Fig. 5 shows the schematic diagram of the battery chip arrays of another embodiment according to the application.As shown in figure 5, wire Reciprocation extension is between the front of the first cell piece 31A and the front of the second cell piece 31B, and wire is in the first battery as a result, The front of piece 31A and the second cell piece 31B forms front side conductive line, in the case, the first cell piece 31A and the second cell piece 31B is connected in parallel to each other, it is, of course, understood that preferably, the back of the back electrode of the first cell piece 31A and the second cell piece 31B The back side conductor wire that electrode can also be formed by another wire reciprocation extension is connected, optionally, the back of the first cell piece 31A The back electrode of electrode and the second cell piece 31B can also be connected by traditional mode.
Below with reference to Fig. 6 description according to the solar battery chip arrays 30 of another embodiment of the application.
It include n × m cell piece 31, in other words, Duo Ge electricity according to the solar battery chip arrays 30 of the embodiment of the present application Pond piece 31 is arranged into the matrix form of n × m, and wherein n is columns, and m is number of rows.More specifically, in this embodiment, 36 batteries Piece 31 is arranged in 6 column and 6 rows, i.e. n=m=6.It is understood that the application is not limited to this, for example, number of rows and columns can With unequal.For convenience, in Fig. 6, the cell piece 31 in direction from left to right, same row's cell piece 31 is successively The cell piece 31 of referred to as first, second, third, fourth, the 5th and the 6th, along direction from the top down, the row of cell piece 31 is successively The row's cell piece 31 of referred to as first, second, third, fourth, the 5th and the 6th.
In same row's cell piece 31, surface and adjacent another battery of the wire reciprocation extension in a cell piece 31 Between the surface of piece 31, in adjacent two rows of cell pieces 31, a cell piece 31 of the wire reciprocation extension in a row Between surface and the surface of a cell piece 31 in a+1 row, and m-1 >=a >=1.
As shown in fig. 6, in same row's cell piece 31, wire reciprocation extension is in a battery in specific example Piece 31 it is positive between the back side of another adjacent cell piece 31, the cell piece 31 in same row is one another in series as a result,.? In adjacent two rows of cell pieces 31, wire reciprocation extension is in the front and position of the cell piece 31 for an end for being located at a row Between the back side of a cell piece 31 of the end of a+1 row, thus adjacent two rows of cell pieces 31 are one another in series.
It is highly preferred that in adjacent two rows of cell pieces 31, electricity of the wire reciprocation extension in an end for being located at a row Between the surface of pond piece 31 and the surface of the cell piece 31 positioned at the end of a+1 row, the end of a row and a+ The end of 1 row is located at the same side of matrix, such as in Fig. 6, positioned at the right side of matrix.
More specifically, in the embodiment shown in fig. 6, in the first row, first battery of one metal wire reciprocation extension Between the back side between the front of piece 31 and the second cell piece 31, the front of second the second cell piece of one metal wire reciprocation extension 31 Between the back side between third cell piece 31, front and the 4th battery of third one metal wire reciprocation extension third cell piece 31 Between the back side between piece 31, between the front and the 5th cell piece 31 of the 4th cell piece 31 of the 4th one metal wire reciprocation extension Between the back side, between the back side between the front and the 6th cell piece 31 of the 5th cell piece 31 of the 5th one metal wire reciprocation extension, The adjacent cell piece 31 in first row is one another in series by corresponding wire as a result,.
The front of the 6th cell piece 31 in six roots of sensation wire reciprocation extension first row and the in adjacent second row Between the back side between six cell pieces 31, first row and second row are one another in series as a result, the 7th one metal wire reciprocation extension second Between the back side in the front of the 6th cell piece 31 in row and second row between the 5th cell piece 31, the 8th one metal wire is reciprocal Extend between the back side in the front and second row of the 5th cell piece 31 in second row between the 4th cell piece 31, with such It pushes away, until front and the first cell piece in second row of the second cell piece 31 in the 11st one metal wire reciprocation extension second row Between the back side between 31, then, the front of the first cell piece 31 in the 12nd one metal wire reciprocation extension second row and the Between the back side in three rows between the first cell piece 31, thus second row is one another in series with third row.Then, successively third is arranged It connects with the 4th row, the 4th row connects with the 5th row, and the 5th row connects with the 6th row, thus completes the system of battery chip arrays 30 It is standby, in this embodiment, it is arranged in the left side of first cell piece 31 in the left side and the 6th row of the first cell piece 31 of first row Busbar, a busbar connect the conductor wire extended from the left side of the first cell piece 31 of first row, and another busbar connects Connect the conductor wire extended from the left side of the first cell piece 31 of the 6th row.
As shown in the figure and above-mentioned, connection between the cell piece of the embodiment of the present application is connected using conductor wire, first row, the It is all made of conductor wire between two rows, third row, the 4th row, the 5th row and the 6th row and realizes series connection, as shown, optionally, Can between second row and third row, it is in parallel for preventing the diode of spottiness, two poles between the 4th row and the 5th row The connection of pipe can be using well known to a person skilled in the art technologies, such as busbar.
However, the application is not limited to this, for example, can connect between first row and second row, third row and the 4th row Series connection, the 5th row and the 6th row series connection, while second row and third row are in parallel, the 4th row and the 5th row are in parallel, in the case, Busbar can be respectively set in the left or right side setting accordingly arranged.
Optionally, the cell piece 31 in same row can be in parallel, for example, an one metal wire is from the first battery in first row The front reciprocation extension of piece 31 passes through the front of the second to the 6th cell piece 31.
Preferably, wire of the reciprocation extension between the adjacent cell piece 31 of same row is one, and reciprocation extension exists Wire between the cell piece 31 of adjacent row is one.It can be realized as a result, by the multiple reciprocation extension of an one metal wire Connection between two neighboring cell piece 31, preparation is simpler, and cost is lower.
In the application one embodiment, welding layer, the thickness of welding layer and the diameter of wire are coated on wire The ratio between be 0.02-0.5:1.
That is, in battery chip arrays 30, the thickness and conductor wire 32 of welding layer (including front side conductive line 32A and Back side conductor wire 32B) diameter ratio can be 0.02-0.5:1.
In this application, conductor wire 32 (including front side conductive line 32A and back side conductor wire 32B) includes wire and cladding Welding layer in the wire surface.Welding layer can coat wire completely, can also partially coat wire.Work as welding When the cladding wire of layer part, welding layer is preferably formed at the position welded with the secondary grid line 312 of cell piece 31.Work as welding layer When coating wire completely, welding layer can be coated on the periphery of wire in the form of cricoid.The thickness of welding layer can be Selection in larger range.Under preferable case, welding layer with a thickness of 1-100 microns, more preferably 1-30 microns.
The low-melting alloy for forming welding layer can be the low-melting alloy of this field routine, and fusing point can be 100- 220℃.Under preferable case, low-melting alloy contains Sn and selected from least one of Bi, In, Ag, Sb, Pb and Zn, more excellent Choosing is containing Sn, Bi and selected from least one of In, Ag, Sb, Pb and Zn.
Specifically, low-melting alloy can be Sn-Bi alloy, In-Sn alloy, Sn-Pb alloy, Sn-Bi-Pb alloy, Sn- At least one of Bi-Ag alloy, In-Sn-Cu alloy, Sn-Bi-Cu alloy and Sn-Bi-Zn alloy.Most preferably, low melting point Alloy is Bi-Sn-Pb alloy, such as it is the conjunction that 55 weight % and Pb contents are 5 weight % that Sn content, which is 40 weight %, Bi contents, Golden (namely Sn40%-Bi55%-Pb5%).The thickness of welding layer can be 0.001-0.06mm.The cross-sectional area of conductor wire 32 It can be 0.01-0.5mm2.Wire can be wire commonly used in the art, such as copper wire.
In some specific embodiments of the application, the binding force between wire and secondary grid line is in 0.1-0.8 newton In the range of.That is, the binding force between conductor wire 32 and cell piece 31 is between 0.1-0.8 newton.Preferably, metal Binding force between silk and cell piece 31 is in the range of 0.2-0.6 newton, firm welding between cell piece and wire, cell piece It is less prone to desoldering in operation and transfer process, is less prone to poor contact, performance decline, while cost is relatively low.
Below with reference to Figure 10 and Figure 11 description according to the solar cell module 100 of the embodiment of the present application.
It as shown in Figure 10 and Figure 11, include upper cover plate 10, front according to the solar cell module of the embodiment of the present application 100 Adhesive film 20, above-mentioned battery chip arrays 30, back side adhesive film 40 and backboard 50.It is upper cover plate 10, front adhesive film 20, above-mentioned Battery chip arrays 30, back side adhesive film 40 and backboard 50 are sequentially stacked along the vertical direction.
Front adhesive film 20 and back side adhesive film 40 can be adhesive film commonly used in the art, it is preferable that front glue Film layer 20 and 40 polyethylene octene elastomer (POE) of back side adhesive film and/or ethylene-vinyl acetate copolymer (EVA).At this In application, polyethylene octene elastomer (POE) and ethylene-vinyl acetate copolymer (EVA) can routinely be made using this field Product is prepared according to method well known to those skilled in the art.
In embodiments herein, upper cover plate 10 and backboard 50 can be carried out according to this field conventional technique selection and It determines, it is preferable that upper cover plate 10 and backboard 50 respectively can be transparent plate, such as glass plate.
It, can be first by the secondary grid line and back of conductor wire and cell piece 31 in the preparation process of solar cell module 100 Then each layer is laid out and is laminated by electrode welding.
It can be known in the art according to other component parts of the solar cell module 100 of the application, herein not It repeats again.
Specifically, solar cell module 100 includes upper cover plate 10, front adhesive film 20, battery chip arrays 30, back side glue Film layer 40 and backboard 50.Battery chip arrays 30 include multiple cell pieces 31, pass through more conductor wires 32 between adjacent cell piece 31 It is connected, conductor wire 32 is formed by wire S of the reciprocation extension between the surface of adjacent cell piece, and conductor wire 32 and secondary grid line weld It connects, front adhesive film 20 is directly contacted with conductor wire 32 and is filled between adjacent conductor wire 32.
It in other words, include being sequentially stacked upper cover along the vertical direction according to the solar cell module of the embodiment of the present application 100 Plate 10, front adhesive film 20, battery chip arrays 30, back side adhesive film 40 and backboard 50, battery chip arrays 30 include multiple batteries Piece 31 and more conductor wires 32 for connecting multiple cell pieces 31, conductor wire 32 are made of wire S, and wire S reciprocation extension exists On the surface of two adjacent cell pieces 31.
Conductor wire 32 is electrically connected with cell piece 31, wherein front adhesive film 20 and conductor wire 32 on cell piece 31 It directly contacts and is filled between adjacent conductor wire 32, front adhesive film 20 can both play the work of fixed conductor wire 32 With, and conductor wire 32 and outside air and steam can be completely cut off, so that conductor wire 32 be avoided to be oxidized, it ensure that photoelectric conversion Efficiency.
As a result, according to the solar cell module of the embodiment of the present application 100, by being made of the wire S of reciprocation extension Conductor wire 32 replace conventional batteries piece main gate line and welding, reduce costs；The wire S of reciprocation extension reduces metal The number of the free end of silk S, required space is small when wire S is arranged, and is not limited by a space, is made of wire S reciprocation extension The radical of conductor wire 32 can greatly improve, preparation is simple, can produce in batches；Front adhesive film 20 and conductor wire 32 are direct It contacts and is filled between adjacent conductor wire 32, effectively conductor wire 32 and outside air, steam etc. can be completely cut off, avoided Incident photon-to-electron conversion efficiency can be effectively ensured in the oxidation of conductor wire 32.
In some specific embodiments of the application, a cell piece 31 of the wire S in adjacent cell piece 31 Reciprocation extension, front adhesive film 20 and leading on the front of a cell piece 31 between front and the back side of another cell piece 31 Electric wire 32 directly contacts and between the adjacent conductive line 32 that is filled on the front of a cell piece 31, back side adhesive film 40 and another The conductor wire 32 at the back side of one cell piece 31 directly contacts and is filled in the adjacent conductive line at the back side of another cell piece 31 Between 32.
That is, in this application, two adjacent cell pieces 31 are connected by wire S, and adjacent two In a cell piece 31, the front of a cell piece 31 is connected with wire S, the back side and the wire S phase of another cell piece 31 Even.
Wherein, the front adhesive film 20 and the positive gold of cell piece 31 on cell piece 31 that front is connected with wire S Belong to silk S directly to contact and be filled between adjacent conductor wire 32, the back side glue for the cell piece 31 that the back side is connected with wire S Film layer 40 is directly contacted with the wire S at 31 back side of cell piece and is filled between adjacent conductor wire 32 (such as Fig. 2 institute Show).
As a result, according to the solar cell module of the embodiment of the present application 100, not only front adhesive film 20 can will be a part of Positive conductor wire 32 and the external world of cell piece 31 separate, and back side adhesive film 40 can also leading the back side of percentage of batteries piece 31 Electric wire 32 is separated with the external world, may further ensure that the photoelectric conversion efficiency of solar cell module 100.
In some specific embodiments of the application, the size for conventional cell piece is 156mm × 156mm；Too It is positive can the series resistance of battery component be milliohm/60 piece 380-440, while the application is not limited to 60, can be 30, 72 etc., the series resistance of solar cell module is 456-528 milliohm, the excellent electrical property of battery when for 72.
In some specific embodiments of the application, the size for conventional cell piece is 156mm × 156mm；Too It is positive can the open-circuit voltage of battery component be 37.5-38.5V/60 piece, same the application is not limited to 60, can be 30, 72 etc..Short circuit current is 8.9-9.4A, and short circuit current is unrelated with the number of cell piece.
In some specific embodiments of the application, the fill factor of solar cell module is 0.79-0.82, no It is influenced by the size and number of cell piece, influences the electrical property of battery.
In some specific embodiments of the application, the size for conventional cell piece is 156mm × 156mm；Too The operating voltage of positive energy battery component is 31.5-32V/60 piece, and same the application is not limited to 60, can be 30,72 Piece etc..Operating current is 8.4-8.6A, and operating current is unrelated with the number of cell piece.
In some specific embodiments of the application, the size for conventional cell piece is 156mm × 156mm；Too The transfer efficiency of positive energy battery component is 16.5-17.4%.Power is 265-280W/60 piece.
Below with reference to Fig. 7-9 description according to the preparation method of the solar cell module 100 of the embodiment of the present application.
Specifically, according to the preparation method of the solar cell module of the embodiment of the present application the following steps are included:
Cell piece 31 is provided, cell piece 31 includes battery sheet matrix 311 and the pair being located on the front of battery sheet matrix 311 Grid line 312.
By the conductor wire 32 being made of wire and the secondary welding of grid line 312 to obtain solar battery sheet, wherein secondary grid line 312 are equipped with weld part 3123, projection of the weld part 3123 on battery sheet matrix 311 in the welding position welded with conductor wire 32 Area for the combination of round, ellipse, polygon or above-mentioned shape, the projection of weld part 3123 is greater than in secondary grid line 312 Length is equal with weld part 3123 on length direction and the area of projection at 312 sections of the secondary grid line of non-solder position.
Upper cover plate 10, front adhesive film 20, battery chip arrays 30, back side adhesive film 40 and backboard 50 are sequentially stacked, and So that the front of cell piece 31 is faced back side adhesive film 40 in face of the back side of front adhesive film 20, cell piece 31, is then laminated Obtain solar cell module 100.
Preparation method according to the solar cell module 100 of the embodiment of the present application includes preparing above-mentioned cell piece first Then array 30 is sequentially stacked upper cover plate 10, front adhesive film 20, battery chip arrays 30, back side adhesive film 40 and backboard 50, most After be laminated to obtain solar cell module 100.It is understood that the preparation of solar cell module 100 further includes it His step, such as the space between upper cover plate 10 and backboard 50 is sealed with sealant, and said elements is fastened using U-frame Together, this it is known to those skilled in the art that, be not detailed herein.
The preparation of solar battery chip arrays 30 include by wire reciprocation extension between the surface of cell piece 31 and with The surface of the cell piece 31 is electrically connected to form more conductor wires, and thus adjacent cell piece 31 passes through the more conductor wires It connects and forms battery chip arrays 30.
Specifically, as shown in fig. 7, in a tensioned state, by 321 reciprocation extension of wire 12 times.Then, as shown in figure 8, Prepare the first cell piece 31A and the second cell piece 31B.Next, as shown in figure 9, by the front of the first cell piece 31A and metal Silk is connected and the back side of the second cell piece 31B is connected with wire, and battery chip arrays 30 are consequently formed, show two in Fig. 9 A cell piece 31, as described above, when battery chip arrays 30 have multiple cell pieces 31, using the wire of reciprocation extension by one The front of a cell piece 31 is connected with the back side of another adjacent cell piece 31, i.e., by the secondary grid line of a cell piece 31 and separately The back electrode of one cell piece 31 is connected with wire.Wire is opened by being located at two clips of this two end of root silk Tightly lower reciprocation extension, the wire only need two clips that coiling can be realized, greatly reduce the dosage of clip, save dress With space.
In the embodiment shown in fig. 9, adjacent cell piece is one another in series, as described above, as needed, adjacent cell piece can To be connected in parallel to each other by wire.
By the battery chip arrays 30 being prepared and upper cover plate 10, front adhesive film 20, back side adhesive film 40 and backboard 50 It is sequentially stacked, and the front of the cell piece 31 is made to face back in face of the back side of the front adhesive film 20, the cell piece 31 Then face adhesive film 40 is laminated to obtain solar cell module 100.It is understood that wire and cell piece 31 Connection can carry out in lamination process, it is of course also possible to first connect, it is rear to be laminated.
Front adhesive film 20 directly contacts placement with conductor wire 32, and in lamination, front adhesive film 20 melts filling conductor wire Gap between 32.Back side adhesive film 40 directly contacts placement with conductor wire 32, and in lamination, back side adhesive film 40 melts filling Gap between conductor wire 32.
Example 1
Example 1 is used to illustrate the example of solar cell module of the application and preparation method thereof.
(1) wire S is prepared
Adhere to one layer of Sn40%-Bi55%-Pb5% alloy-layer on the surface of copper wire (fusing point is 125 DEG C), wherein copper Silk cross-sectional area be 0.04mm2, alloy-layer with a thickness of 16 microns, thus be made wire S.
(2) solar cell module is prepared
POE adhesive film (melt temperature is 65 DEG C) having a size of 1630 × 980 × 0.5mm is provided, and ruler is correspondingly provided It is very little be 1633 × 985 × 3mm glass plate and 60 chip sizes be 156 × 156 × 0.21mm polycrystalline silicon battery plate.Cell piece tool There are 91 secondary grid lines, every secondary grid line substantially runs through cell piece in the longitudinal direction, and the distance between adjacent pair grid line is 1.7mm, the back side of cell piece have 5 back electrodes (material is tin, and width is 1.5 millimeters, with a thickness of 10 microns), every back electricity Cell piece is substantially run through in pole in the longitudinal direction, and the distance between adjacent two back electrodes are 31mm.
Wherein, secondary grid line material is silver, and secondary grid line is equipped with 15 for the weld part with conductive wire bonding, and secondary grid line exists It is projected as circle on battery sheet matrix, weld part extends 150 microns on the length direction of secondary grid line, in battery sheet matrix On projected area be 0.005mm2, with a thickness of 10 microns；Extend equal length on the length direction of secondary grid line, i.e., 150 is micro- Rice, projected area of the non-solder portion on battery sheet matrix be 0.003mm2, with a thickness of 5 microns.
60 cell pieces are arranged with a matrix type, between two cell pieces adjacent in same row, make a gold Belong to silk between the front of cell piece and the back side of another cell piece in the state reciprocation extension of tension, wire passes through Two clips for being located at this two end of root silk are tensioned lower reciprocation extension, to form 15 parallel conductor wires, and will 15 weld parts on the secondary grid line of one cell piece respectively with 15 conductive wire bondings, by the back electrode of another cell piece with Conductive wire bonding, welding temperature is 160 DEG C, and the distance between adjacent conductive line being parallel to each other is 9.9mm, thus by 10 Cell piece series connection is in a row, and such battery strings of 6 rows are connected into cell array by busbar.
Then, by upper glass plates, upper POE adhesive film, in the matrix form arrangement and with multiple cell pieces of welded wire, Lower POE adhesive film and lower glass plate successively stack from top to bottom, wherein make the light-receiving surface of cell piece in face of front adhesive film, just Face adhesive film is directly contacted with conductor wire, is made the back side of cell piece in face of back side adhesive film, is subsequently placed into laminating machine and carries out layer Pressure, front adhesive film are filled between adjacent conductor wire, so that solar cell module A1 be made.
Comparative examples 1
Comparative examples 1 and the difference of example 1 are:
Weld part is not provided on secondary grid line, the width of secondary grid line is consistent in the longitudinal direction, i.e., secondary grid line is in electricity Projected area on the sheet matrix of pond is consistent in the longitudinal direction.Extend 150 microns of secondary grid line in the longitudinal direction in electricity Projected area on the sheet matrix of pond is 0.003mm2.Conductor wire is directly welded with secondary grid line.To which solar cell module be made D1。
Example 2
Example 2 and the difference of example 1 are:
Projected area of the weld part on battery sheet matrix is 0.008mm2, projection of the non-solder portion on battery sheet matrix Area is 0.004mm2.To which solar cell module A2 be made.
Example 3
Example 3 and the difference of example 1 are:
Projected area of the weld part on battery sheet matrix is 1mm2, projected area of the non-solder portion on battery sheet matrix For 0.006mm2.To which solar cell module A3 be made.
Example 4
Example 4 and the difference of example 2 are:
Weld part on secondary grid line with a thickness of 20 microns, non-solder portion with a thickness of 8 microns.To which solar-electricity be made Pond component A4.
Example 5
Example 5 and the difference of example 2 are:
Weld part on secondary grid line with a thickness of 30 microns, non-solder portion with a thickness of 10 microns.To which solar energy be made Battery component A5.
Performance test:
(1) solder bond power is tested:
The welding in solar cell module A1-A5 and D1 between wire and cell piece pair grid line is tested by the following method Binding force:
1, cell piece is horizontally placed on the test position of tension tester, briquetting will be placed on cell piece, briquetting is placed in The two sides of wire, so that cell piece is not pulled up when test；
2, wire is clipped on the pull ring of tensiometer, direction of pull and cell piece angle at 45 °；
3, start tensiometer, make tensiometer upward uniform motion along the vertical direction, by wire from the pull-up of cell piece surface, The pulling force data that tensiometer measures when record wire is detached from, taking its mean value is the wire between cell piece pair grid line Solder bond force data.
(2) photoelectric conversion efficiency is tested:
The method according to disclosed in IEC904-1 is prepared too above-mentioned example and comparative examples using single flash operation simulator Positive energy battery component A1-A5 and D1 are tested, and test condition is standard test condition (STC): light intensity 1000W/m2；Spectrum For AM1.5；Temperature is 25 DEG C, records the photoelectric conversion efficiency of each cell piece.
As a result as shown in table 1 below.
Table 1
Solar cell module A1 D1 A2 A3 A4 A5
Solder bond power/N 0.23 0.1 0.26 0.48 0.29 0.33
Photoelectric conversion efficiency/% 16.5 15.3 16.7 17 16.9 17.1
By comparison A1-A5 and D1 it can be found that being projected by being arranged on secondary grid line it can be seen from the result of table 1 The weld part widened, the solar cell module of the embodiment of the present application solder bond power with higher, welding effect is good, and Higher photoelectric conversion efficiency can be obtained.
In the description of the present invention, it is to be understood that, term " center ", " longitudinal direction ", " transverse direction ", " length ", " width ", " thickness ", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom" "inner", "outside", " up time The orientation or positional relationship of the instructions such as needle ", " counterclockwise " is to be based on the orientation or positional relationship shown in the drawings, and is merely for convenience of The description present invention and simplified description, rather than the device or element of indication or suggestion meaning must have a particular orientation, with spy Fixed orientation construction and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for descriptive purposes only and cannot be understood as indicating or suggesting relative importance Or implicitly indicate the quantity of indicated technical characteristic.Define " first " as a result, the feature of " second " can be expressed or Implicitly include one or more of the features.In the description of the present invention, the meaning of " plurality " is two or more, Unless otherwise specifically defined.
In the present invention unless specifically defined or limited otherwise, term " installation ", " connected ", " connection ", " fixation " etc. Term shall be understood in a broad sense, for example, it may be being fixedly connected, may be a detachable connection, or be integrally connected；It can be machine Tool connection, is also possible to be electrically connected；It can be directly connected, two members can also be can be indirectly connected through an intermediary Connection inside part.For the ordinary skill in the art, above-mentioned term can be understood in this hair as the case may be Concrete meaning in bright.
In the present invention unless specifically defined or limited otherwise, fisrt feature second feature "upper" or "lower" It may include that the first and second features directly contact, also may include that the first and second features are not direct contacts but pass through it Between other characterisation contact.Moreover, fisrt feature includes the first spy above the second feature " above ", " above " and " above " Sign is right above second feature and oblique upper, or is merely representative of first feature horizontal height higher than second feature.Fisrt feature exists Second feature " under ", " lower section " and " following " include fisrt feature right above second feature and oblique upper, or be merely representative of First feature horizontal height is less than second feature.
In the description of this specification, reference term " one embodiment ", " some embodiments ", " example ", " specifically show The description of example " or " some examples " etc. means specific features, structure, material or spy described in conjunction with this embodiment or example Point is included at least one embodiment or example of the invention.In the present specification, schematic expression of the above terms are not Centainly refer to identical embodiment or example.Moreover, particular features, structures, materials, or characteristics described can be any One or more embodiment or examples in can be combined in any suitable manner.
Although the embodiments of the present invention has been shown and described above, it is to be understood that above-described embodiment is example Property, it is not considered as limiting the invention, those skilled in the art are not departing from the principle of the present invention and objective In the case where can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.

Claims (31)

1. a kind of solar battery cell characterized by comprising
Cell piece, the cell piece include battery sheet matrix and the secondary grid line that is located on the front of the battery sheet matrix；
Conductor wire, the conductor wire intersect with the secondary grid line and weld with the secondary grid line, and the pair grid line is led with described The welding position of wire welding is equipped with weld part, the weld part on the battery sheet matrix be projected as round, ellipse, The combination of polygon or above-mentioned shape, the area of the projection of the weld part are greater than the length on the length direction of the secondary grid line The area of the projection of secondary grid line section equal with the weld part and in non-solder position the and secondary grid line is in the welding position The height for setting place is higher than height of the secondary grid line at non-solder position, wherein the conductor wire is made of wire, described Wire reciprocation extension in a tensioned state before being contacted with the cell piece.
2. solar battery cell according to claim 1, which is characterized in that the area of the projection of the single weld part At 0.005 square millimeter -1 square millimeter.
3. solar battery cell according to claim 2, which is characterized in that the wire is copper wire.
4. solar battery cell according to claim 2, which is characterized in that the wire is coated with welding layer, institute Conductor wire is stated to weld by the welding layer and the secondary grid line.
5. solar battery cell according to claim 4, which is characterized in that the pair grid line is in the welding position Height is 0.01 millimeter -0.03 millimeter, and height of the pair grid line in non-solder position is 0.005 millimeter -0.01 millimeter.
6. solar battery cell according to any one of claims 1-5, which is characterized in that on the single secondary grid line The quantity of weld part be 6-60.
7. solar battery cell according to claim 6, which is characterized in that weld part on the single secondary grid line Quantity is 15-36.
8. solar battery cell according to claim 1, which is characterized in that the quantity of the pair grid line is 20-200 Root.
9. solar battery cell according to claim 8, which is characterized in that the quantity of the pair grid line is 30-120 Root.
10. solar battery cell according to claim 1, which is characterized in that the wire and the secondary grid line it Between binding force in the range of 0.1-0.8 newton.
11. solar battery cell according to claim 10, which is characterized in that the wire and the secondary grid line it Between binding force in the range of 0.2-0.6 newton.
12. a kind of solar battery chip arrays, which is characterized in that including multiple battery units, the battery unit is according to power Benefit requires solar battery cell described in any one of 1-11, passes through the conductor wire between the cell piece of adjacent cell It is connected.
13. solar battery chip arrays according to claim 12, which is characterized in that the conductor wire is by wire structure At the wire is between the surface of a cell piece and the surface of another cell piece in the cell piece of adjacent cell piece Reciprocation extension.
14. solar battery chip arrays according to claim 13, which is characterized in that the wire is in one electricity Reciprocation extension between the front of pond piece and the back side of another cell piece.
15. solar battery chip arrays according to claim 14, which is characterized in that on the back side of the battery sheet matrix Equipped with back electrode, the back electrode of the wire and another cell piece is welded.
16. solar battery chip arrays according to claim 13, which is characterized in that the wire is in one electricity Reciprocation extension 10-60 times between the front of pond piece and the back side of another cell piece.
17. solar battery chip arrays according to claim 13, which is characterized in that the spacing between adjacent conductive line is 2.5-15mm。
18. solar battery chip arrays according to claim 13, which is characterized in that adjacent conductive line forms U-shaped or V-arrangement Structure.
19. solar battery chip arrays according to claim 13, which is characterized in that the cell piece is arranged into n × m's Matrix form, wherein n is columns, and m is number of rows,
In same row's cell piece, surface and adjacent another cell piece of the wire reciprocation extension in a cell piece Between surface, in adjacent two rows of cell pieces, the wire reciprocation extension a row in a cell piece surface with The
Between the surface of a cell piece in a+1 row, and m-1 >=a >=1.
20. solar battery chip arrays according to claim 19, which is characterized in that in adjacent two rows of cell pieces, institute Wire reciprocation extension is stated on the surface of the cell piece for an end for being located at a row and is located at the end that a+1 is arranged Between the surface of cell piece, the end of a row is located at the same of the matrix with the end that the a+1 is arranged Side.
21. solar battery chip arrays according to claim 20, which is characterized in that described in same row's cell piece Wire reciprocation extension is positive between the back side of another adjacent cell piece cell piece,
In adjacent two rows of cell pieces, the wire reciprocation extension is being located at the cell piece of the end of a row just Between face and the back side of a cell piece positioned at the end of a+1 row, with adjacent two rows of cell pieces of connecting.
22. solar battery chip arrays according to claim 19, which is characterized in that reciprocation extension is adjacent same row's Wire between cell piece is one, and wire of the reciprocation extension between the cell piece of adjacent row is one.
23. solar battery chip arrays according to claim 13, which is characterized in that the wire is one.
24. solar battery chip arrays according to claim 13, which is characterized in that be coated with welding on the wire The diameter ratio of layer, the thickness of the welding layer and the wire is 0.02-0.5:1.
25. solar battery chip arrays according to claim 24, which is characterized in that the welding layer contains Sn and choosing From at least one of Bi, In, Ag, Sb, Pb and Zn.
26. solar battery chip arrays according to claim 24, which is characterized in that the welding layer contain Sn, Bi with And selected from least one of In, Ag, Sb, Pb and Zn.
27. solar battery chip arrays according to claim 24, which is characterized in that the welding layer with a thickness of 1- 100 microns.
28. a kind of solar cell module, which is characterized in that including the upper cover plate, front adhesive film, cell piece battle array being sequentially stacked Column, back side adhesive film and backboard, the battery chip arrays are solar battery sheet battle array described in any one of claim 12-27 Column.
29. a kind of preparation method of solar cell module characterized by comprising
Cell piece is provided, the cell piece includes battery sheet matrix and the secondary grid line that is located on the front of the battery sheet matrix；
By the conductor wire being made of wire and the secondary grid line welding to obtain solar battery cell, wherein the pair grid line It is equipped with weld part in the welding position with the conductive wire bonding, the weld part is projected as justifying on the battery sheet matrix The combination of shape, ellipse, polygon or above-mentioned shape, the area of the projection of the weld part are greater than the length in the secondary grid line Length is equal with the weld part on direction and the area of the projection of secondary grid line section in non-solder position, wherein the metal Silk reciprocation extension in a tensioned state before being contacted with the cell piece；
Upper cover plate, front adhesive film, the solar battery cell, back side adhesive film and backboard are successively stacked, and made described The front of solar battery sheet faces front adhesive film, makes the back side of the solar battery sheet in face of back side adhesive film, then It is laminated to obtain the solar cell module.
30. the preparation method of solar cell module according to claim 29, which is characterized in that the cell piece is more It is a, it is connected between adjacent cell piece by the conductor wire and forms battery chip arrays described in any one of claim 13-28.
31. the preparation method of solar cell module according to claim 29, which is characterized in that the wire is reciprocal It extends on the surface of the cell piece.
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US14/738,368 US20160126388A1 (en) 2014-10-31 2015-06-12 Solar cell array, solar cell module and manufacturing method thereof
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US14/738,677 US10381493B2 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
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US14/738,578 US10069019B2 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
US14/738,244 US20160126361A1 (en) 2014-10-31 2015-06-12 Solar cell module and manufacturing method thereof
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US14/738,390 US20160126363A1 (en) 2014-10-31 2015-06-12 Solar cell module and manufacturing method thereof
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US14/738,664 US20160126390A1 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
US14/738,587 US10193003B2 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
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