CN106206768B - 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
CN106206768B
CN106206768B CN201510219378.5A CN201510219378A CN106206768B CN 106206768 B CN106206768 B CN 106206768B CN 201510219378 A CN201510219378 A CN 201510219378A CN 106206768 B CN106206768 B CN 106206768B
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China
Prior art keywords
grid line
cell
cell piece
wire
solar
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CN201510219378.5A
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CN106206768A (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 US14/738,516 priority Critical patent/US20160126389A1/en
Priority to US14/738,578 priority patent/US10069019B2/en
Priority to US14/738,390 priority patent/US20160126363A1/en
Priority to US14/738,244 priority patent/US20160126361A1/en
Priority to US14/738,368 priority patent/US20160126388A1/en
Priority to US14/738,637 priority patent/US20160126373A1/en
Priority to US14/738,409 priority patent/US10529868B2/en
Priority to US14/738,677 priority patent/US10381493B2/en
Priority to US14/738,664 priority patent/US20160126390A1/en
Priority to US14/738,587 priority patent/US10193003B2/en
Priority to US14/738,322 priority patent/US20160126372A1/en
Priority to PCT/CN2015/084060 priority patent/WO2016065939A1/en
Priority to US14/928,863 priority patent/US20160126391A1/en
Publication of CN106206768A publication Critical patent/CN106206768A/en
Publication of CN106206768B publication Critical patent/CN106206768B/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

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Abstract

This application discloses the preparation method of a kind of solar battery cell, solar cell chip arrays, solar cell module and solar cell module, solar battery cell includes：Cell piece, cell piece includes battery sheet matrix and multiple secondary grid lines for being located on the front of battery sheet matrix, secondary grid line includes the edge pair grid line at adjacent cells sheet matrix edge and the intermediate secondary grid line on the inside of edge pair grid line, secondary grid line is equipped with weld part, and the area of the projection of at least one weld part of edge pair grid line on battery sheet matrix is more than the area of the projection of the weld part of intermediate secondary grid line；Multiple conductor wires, multiple conductor wires are separated from each other setting, and conductor wire is welded in weld part and secondary grid line.According to the solar battery cell of the embodiment of the present application, the bonding strength bigger of edge pair grid line and conductor wire, and the join domain being connected with conductor wire with bigger, convenient for the connection between conductor wire and edge pair grid line.

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 cell chip arrays, too Positive energy battery component and preparation method thereof.
Background technology
Solar cell module is one of important component of device of solar generating.Front illuminated of the sunlight from cell piece Onto cell piece, cell piece includes battery sheet matrix and the main gate line being located on cell piece front side of matrix and secondary grid line, main gate line The positive part that battery sheet matrix is covered with secondary grid line, thus can block a part of sunlight, impinge upon main gate line and secondary grid Solar energy on line can not be transformed into electric energy, and therefore, it is necessary to main gate line and secondary grid line are more thinner better.However, main gate line and pair The effect of grid line is to conduct electric current, and from the point of view of resistivity, it is smaller that main gate line and secondary grid line get over detailed rules and regulations conduction cross-sectional area, Ohmic loss is bigger.Therefore the design needs of main gate line and secondary grid line obtain balance between shading and conduction, while to consider Cost.
Invention content
The application is made to the discovery of following facts and problem and understanding based on applicant：
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 cell 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 printing the slurry that main component is expensive silver , therefore, manufacturing cost is very high, increases the radical of silver-colored main gate line and 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), increases the radical of silver-colored main gate line and 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-colored main grid and welding in conventional solar cell piece is substituted in wire.
Present inventor has found by long-term research experiment, if use while pulling out more parallel metals Silk, then cuts more one metal wires, then fixation is soldered on cell piece simultaneously by more one metal wires.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 and be centainly bent, 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 Set the device of similar clip, which needs to occupy certain space, and the space of cell piece be it is limited, therefore, existing skill The wire that at most can only pull out and fix at present welding 10 or so in art simultaneously 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 to accurately 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 Belong to silk, the radical for capableing of increased conductor wire is still limited, general at most only 10 or so, and realizes 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, more parallel wires are first passed through cohesive mode 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 makes wire be contacted with the secondary grid line on cell piece.The program fixes more one metal wires by transparent film layer, solves 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, to derived current.
Although this scheme can further promote the radical of wire, due to the presence of transparent film layer, light can be influenced Absorption, certain shading is caused, so as to cause the reduction of transfer efficiency.
Importantly, this scheme for fixing wire using transparent film layer is welding procedure can not to be used to connect metal Silk and secondary grid line.This is because, on the one hand, if using welding procedure, the fusion temperature of transparent film layer has to higher than weldering Jointing temp (welding temperature is generally at 140 DEG C or so).Otherwise, it if the fusion temperature of transparent film layer is less than welding temperature, is welding When connecing, adhesive film can melt, and fix the effect of wire to lose it, 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 needs to be in sealing state when in use, 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 the adhesive film that can not penetrate solid, to which cell piece to be fully sealed, therefore, sealing effect is excessively poor, practical to produce Product are easy to fail.Therefore, for the angle of encapsulation, and the fusion temperature of transparent film layer is needed to be less than welding temperature, this is aobvious It is so an antinomy.
Therefore, this scheme that wire is fixed using 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 during use, 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 ripe dereliction grid solar cell.
In addition, in existing dereliction grid solar cell piece, the part that wire extends cell piece need to be with other batteries Piece is either loaded the wire that connection etc. is extended and can be acted on by external force in using process or handling process, such as Situations such as collision, vibrations, wire are very easy to be detached from secondary grid line due to external force, make positioned at the part at cell piece edge At poor contact, it is greatly lowered so as to cause the efficiency of cell piece, even fails.More particularly wire is thinner, this Body will also result in wire and edge pair grid be easily peelable, the stripping of edge pair grid can also influence there is also larger shrinkage stress The stripping of intermediate grid line, the peeling force that the peeling force that the connecting portion at edge is subject to is subject to relative to internal interconnecting piece is greatly very More, the secondary grid line positioned at edge, which is then susceptible to, connects unstable situation.
The application is intended to solve one of above-mentioned technical problem at least to a certain extent.
More main grid solar cells 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 that a kind of solar battery cell, the solar battery cell are simple to manufacture, are at low cost, light Photoelectric transformation efficiency is high.
The application also proposes a kind of solar cell 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 cell chip arrays, the solar cell 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 has found by long-term research experiment, when the secondary grid line on wire and battery sheet matrix welds When connecing, because wire is thinner, there are the welding between larger 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 cause such cell piece that can not use, 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, including：Cell piece, the cell piece include electricity Pond sheet matrix and the multiple secondary grid lines being located on the front of the battery sheet matrix, the pair grid line include the neighbouring cell piece The edge pair grid line of matrix border and the intermediate secondary grid line on the inside of the edge pair grid line, the pair grid line are equipped with welding Portion, the area of the projection of at least one weld part of the edge pair grid line on the battery sheet matrix are more than described intermediate secondary The area of the projection of the weld part of grid line；Multiple conductor wires, the multiple conductor wire are separated from each other setting, and the conductor wire exists The weld part is welded with the secondary grid line.
According to the solar battery cell of the embodiment of the present application, by being arranged weld part on secondary grid line, and by edge The area of weld part on secondary grid line is set greater than the area of the weld part of intermediate secondary grid line so that edge pair grid line and conduction The bonding strength bigger of line, and the join domain being connected with conductor wire with bigger, convenient for conductor wire and edge pair grid line Between connection.
According to the solar cell chip arrays of the application second aspect embodiment, including multiple solar battery cells, institute It is the solar battery cell according to above-described embodiment to state solar battery cell, is led between the cell piece of adjacent cell piece The conductor wire is crossed to be connected.
According to the solar cell module of the application third aspect embodiment, including the upper cover plate, the front glue that are 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, including：Cell piece, institute are provided It includes battery sheet matrix and multiple secondary grid lines for being located on the front of the battery sheet matrix to state cell piece, and the pair grid line includes The edge pair grid line of the neighbouring cell piece matrix border and the intermediate secondary grid line on the inside of the edge pair grid line, the pair Grid line is equipped with weld part, the area of the projection of at least one weld part of the edge pair grid line on the battery sheet matrix More than the area of the projection of the weld part of the intermediate secondary grid line；By the conductor wire being made of wire in the weld part and institute Secondary grid line is stated to be connected to obtain solar battery cell；By upper cover plate, front adhesive film, the solar battery cell, the back side Adhesive film and backboard stack successively, and the front of the solar battery cell is made to face front adhesive film, make the solar energy The back side of battery unit faces back side adhesive film, is then laminated to obtain the solar cell module.
Description of the drawings
Fig. 1 is the floor map according to the solar cell chip arrays of the application one embodiment.
Fig. 2 is longitudinal schematic cross-section according to the solar cell chip arrays of the application one embodiment.
Fig. 3 is the lateral schematic cross-section according to the solar cell 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 cell chip arrays of another embodiment of the application.
Fig. 6 is the floor map according to the solar cell 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 cell chip arrays of the embodiment of the present application.
Fig. 9 is that two cell pieces shown in Fig. 8 are formed by connecting the schematic diagrames of solar cell 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 cell chip arrays of the application another embodiment.
Figure 13 is the structural schematic diagram according to the secondary grid line of the solar battery cell of the application one embodiment.
Reference numeral：
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；Edge pair grid line 3121；Intermediate pair grid line 3122；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 50.
Specific implementation mode
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 for explaining 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, is located on 311 front of battery sheet matrix secondary grid line 312 is set Back of the body electric field 313 at the back side of battery sheet matrix 311 and the back electrode 314 that is located on back of the body 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 of the body electric field 313 is referred to as the back of the body 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 by silicon chip through process making herbs into wool, diffusion, etching edge, deposited silicon nitride layer The intermediate products obtained afterwards, it should be understood that in the application, battery sheet matrix 311 is not limited to be made of silicon chip.
In other words, cell piece 31 includes silicon chip, to some process layers of silicon chip surface, the secondary grid line of light-receiving surface and shady face Back of the body electric field 313 and back electrode 314 or equivalent not front electrode other class solar cells.
In this application, battery unit, cell piece 31 and battery sheet matrix 311 are intended merely to facilitate description, and cannot It is interpreted as the limitation to the application.
" solar cell 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 cell chip arrays 30, wire S constitutes the conductor wire 32 of cell piece, and wire S extends in adjacent It should broadly understood between the surface of cell piece 31, wire S can extend between the surface of adjacent cell piece 31, wire S can be connected with the secondary grid line 312 of cell piece 31 or wire S can also be with a cell piece 31 in adjacent cell piece 31 Secondary grid line 312 be connected with the back electrode 314 of another cell piece 31 or the secondary grid of a part of wire S and cell piece 31 Line 312 is connected, remaining wire S is connected with the back electrode 314 of cell piece 31 simultaneously.
In other words, wire S can extend between the front of adjacent cell piece 31, can also extend in adjacent cell piece Between the front and the back side of another cell piece 31 of a cell piece 31 in 31.Adjacent cell piece is extended in wire S When between the front and the back side of another cell piece 31 of a cell piece 31 in 31, conductor wire 32 may include extending in electricity The front side conductive line 32A being electrically connected on the front of pond piece 31 and with the secondary grid line 312 of cell piece 31, and extend in cell piece 31 The back side on and the back side conductor wire 32B that is electrically connected with the back electrode of cell piece 31 314, wire S be located at adjacent cell piece 31 Between part be 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 cell according to the embodiment of the present application is described below.
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 multiple secondary grid lines 312 being located on the front of battery sheet matrix 311, secondary grid line 312 include the edge pair grid line 3121 at 311 edge of adjacent cells sheet matrix and the intermediate pair positioned at 3121 inside of edge pair grid line Grid line 3122, secondary grid line 312 are equipped with weld part 3123, and at least one weld part 3123 of edge pair grid line 3121 is in cell piece The area of projection on matrix 311 is more than the area of the projection of the weld part 3123 of intermediate secondary grid line 3122, multiple conductor wires 32 Be separated from each other setting, and conductor wire 32 is welded in weld part 3123 and secondary grid line 312.
In other words, it is mainly made of cell piece 31 and conductor wire 32 according to the solar battery cell of the application, cell piece 31 are mainly made of battery sheet matrix 311 and secondary grid line 312, in this application, will be to be located at the front of battery sheet matrix 311 Secondary grid line 312 for be described in detail.
Wherein, secondary grid line 312 includes edge pair grid line 3121 and intermediate secondary grid line 3122, and edge pair grid line 3121 is located at neighbour On nearly 311 marginal position of battery sheet matrix, on the edge for the left and right sides that can be specifically located at adjacent cells sheet matrix 311, in Between secondary grid line 3122 be then located between the edge pair grid line 3121 of 311 both sides of battery sheet matrix, set respectively on each pair grid line 312 There are weld part 3123, the area of the weld part 3123 at least one edge pair grid line 3121 to be more than on intermediate secondary grid line 3122 The area of weld part 3123.
In addition, in this application, the area of the weld part 3123 at least one edge pair grid line 3121 is more than intermediate pair The area of weld part 3123 on grid line 3122 can be understood as all weld parts 3123 on an edge pair grid line 3121 Area is more than the area of the weld part 3123 of intermediate secondary grid line 3122, can also be the part welding of an edge pair grid line 3121 The area in portion 3123 is more than the area of the weld part 3123 of intermediate secondary grid line 3122, i.e. weld part on edge pair grid line 3121 3123 a part of can increase area, can also all increase area.
It should be noted that the cell piece of existing printing, is located at the width at the edge and intermediate secondary grid line of battery sheet matrix Degree is identical, but be directed to dereliction grid solar cell, conductor wire extend cell piece part need to other cell pieces or Load connection etc., the conductor wire extended can be acted in using process or handling process by external force, such as collide, and shake Situations such as dynamic, conductor wire are very easy to be detached from secondary grid line due to external force, cause to contact positioned at the part at cell piece edge It is bad, it is greatly lowered so as to cause the efficiency of cell piece, even fails.More particularly conductor wire of the invention is using gold Belong to silk, wire is thinner, and there is also larger shrinkage stresses for itself, cause conductor wire and edge pair grid easily peelable, edge pair grid Stripping can also influence the stripping of intermediate grid line, the peeling force that the connecting portion at edge is subject to relative to internal interconnecting piece by Peeling force it is much larger, the secondary grid line positioned at edge, which is then susceptible to, connects unstable situation.
In addition, for the conductor wire using the reciprocal coiling of single metal wire, conductor wire is at the edge of battery sheet matrix Position is not formed as straight line, and is created as arc-shaped, " u "-shaped or other curved shapes, the stress bigger of wire, and The endpoint of every conductor wire and the distance between the secondary grid line at cell piece edge have certain deviation, the secondary grid line of marginal position with The link position of conductor wire has uncertainty, is also susceptible to and connects unstable situation.
And according to the solar battery cell of the embodiment of the present application, secondary grid line 312 is divided into edge pair grid line 3121 in Between secondary 3122 two parts of grid line, and the area of the weld part 3123 on an at least edge pair grid line 3121 is set greater than The area of weld part 3123 on intermediate pair grid line 3122 so that conductor wire 32 not only has higher with edge pair grid line 3121 Bonding strength, and edge pair grid line 3121 and conductor wire 32 there is bigger can connection area so that conductor wire 32 be easy with Edge pair grid line 3121 welds, and reduces and connects unstable situation.
As a result, according to the solar battery cell of the embodiment of the present application, by the way that weld part is arranged on secondary grid line 312 3123, and the area of the weld part 3123 on edge pair grid line 312 is set greater than to the weld part of intermediate secondary grid line 312 3123 area so that the bonding strength bigger of edge pair grid line 312 and conductor wire 32, and with bigger and conductor wire 32 Connected join domain, convenient for the connection between conductor wire 32 and edge pair grid line 312.According to one embodiment of the application, The projected area of weld part on edge pair grid line is 0.1-1.2mm2, the projected area of the weld part on intermediate pair grid line is 0.01-0.2mm2。
According to one embodiment of the application, the weld part 3123 of edge pair grid line 312 is in the side for being orthogonal to secondary grid line 312 Upward width is more than the width of the weld part 3123 of intermediate secondary grid line 312.
That is, as shown in figure 13, line width of the secondary grid line 312 in the position intersected with conductor wire 32 carries out widening place It manages, the position on secondary grid line 312 is used to be welded with conductor wire 32 as weld part 3123.By the weldering on secondary grid line 312 Socket part 3123 carry out widening treatment, can in order to which secondary grid line 312 and conductor wire 32 are welded, meanwhile, other portions of secondary grid line 312 Position can keep former line width, or even reduce line width, while ensureing the welding effect of secondary grid line 312 and conductor wire 32, may be used also To reduce shading-area.
Specifically, the width of the weld part 3123 of edge pair grid line 3121 is more than the weld part 3123 of intermediate secondary grid line 3122 Width.As a result, according to the solar battery cell of the embodiment of the present application, by the way that secondary grid line 312 is welded with conductor wire 32 Position widen, and the position welded with conductor wire 32 on edge pair grid line 3121 is wider so that conductor wire 32 and edge pair Grid line 3121 welds simpler, weld strength higher.
Optionally, according to one embodiment of the application, the width of the weld part 3123 of edge pair grid line 3121 is 0.08- 0.6mm.Preferably, the width of the weld part 3123 of edge pair grid line 3121 is 0.15-0.3mm.The weld part of the size as a result, 3123 have the solderable area of bigger, and weld strength higher with conductor wire 32,
In some specific implementation modes of the application, part of the edge pair grid line 3121 between adjacent solder portion 3123 Width be equal to the width of part of the intermediate secondary grid line 3122 between adjacent solder portion 3123.Optionally, edge pair grid line The width of 3121 part between adjacent solder portion 3123 is 0.015-0.03mm.
That is, in this application, secondary grid line 312 is made of edge pair grid line 3121 and intermediate secondary grid line 3122, In, the width of the part on edge pair grid line 3121 other than weld part 3123 is equal on intermediate secondary grid line 3122 in addition to weldering The width of part except socket part 3123.
The width of the part on edge pair grid line 3121 other than weld part 3123 is arranged to and intermediate secondary grid as a result, The width of part on line 3122 other than weld part 3123 is equal, contributes to reduce shading-area in this way, ensures that photoelectricity turns Efficiency is changed, and reduces the dosage that secondary grid line 312 prepares material, reduces cost.
In actual fabrication process, due to reciprocal coiling, wire has the straight line portion being mutually parallel and junction bending Variant part, the variant part (junction of i.e. adjacent two conductor wires) of wire can be gradually deviated from original straight line due to deformation Direction, therefore, in order to ensure that the variant part of the bending of coiling wire can be welded with edge pair grid line, prevent due to deformation and Deviate weld part 3123, it is preferable that the length of the weld part 3123 of edge pair grid line 3121 is more than edge pair grid line 3121 in phase The length of part between adjacent weld part 3123.Further, the length and edge of the weld part 3123 of edge pair grid line 3121 The length ratio of part of the secondary grid line 3121 between adjacent solder portion 3123 is 1.05-1.3:1.
In other words, the length of the weld part 3123 on edge pair grid line 3121 is more than the length in non-solder region.It welds as a result, Socket part 3123 has the solderable area of bigger, the wire and weld strength higher of coiling with conductor wire 32.In the application Some specific implementation modes in, edge pair grid line 312 be adjacent cells sheet matrix 311 side secondary grid line 312.
Optionally, according to one embodiment of the application, edge pair grid line 3121 of the adjacent cells sheet matrix 311 per side For the 5th pair grid line 312 of 1- since outermost.Preferably, edge pair grid line of the adjacent cells sheet matrix 311 per side 3121 be the 1st to the 4th secondary grid line 312 since outermost.Further, side of the adjacent cells sheet matrix 311 per side Edge pair grid line 3121 is the 1st to the 3rd secondary grid line 312 since outermost.Most preferably, adjacent cells sheet matrix 311 is every The edge pair grid line 3121 of side is the 1st to the 2nd secondary grid line 312 since outermost.
It is understood that edge pair grid line 3121 can be all secondary grid lines of the side of adjacent cells sheet matrix 311 312, can also be part pair grid line 312, i.e., 3121 width of a portion edge pair grid line increases, another part edge pair grid 3121 width of line is equal with intermediate secondary 3122 width of grid line.It is wherein preferably, the one of the edge of closest battery sheet matrix 311 Root edge pair grid line 3121 is widened, and the width of remaining edge pair grid line 3121 is the width with intermediate secondary grid line 3122 Equal.
In addition, the weld part 3123 on edge pair grid line 3121 can be each carry out widening treatment, can also be Weld part 3123 on same root edge pair grid line 3121 is spaced apart widening treatment, can also be adjacent edge pair grid line 3121 On weld part 3123 be spaced apart widening treatment.
As shown in figure 13, in this example, the secondary grid line 312 in the left side of adjacent cells sheet matrix 311 constitutes edge pair Grid line 3121, constitute edge pair grid line 3121 secondary grid line 312 number can according to the position of 32 coiling of conductor wire come It determines.
That is, edge pair grid line 312 is equipped on the position of the neighbouring one side edge of battery sheet matrix 311, tool The installation position of body can rationally be adjusted according to the rigging position of battery sheet matrix 311 and the welding position of conductor wire.It is right For the secondary grid line 312 in left side, start from left to right, first secondary grid line 312 and second secondary grid line 312 constitute left side Edge pair grid line 3121, for the secondary grid line 312 on right side, starts from right to left, first secondary grid line 312 and second pair Grid line 312 constitutes the edge pair grid line 3121 on right side.
Preferably, in some specific implementation modes of the application, the width of edge pair grid line 3121 is more than intermediate secondary grid The width of line 3122.Specifically, the width of edge pair grid line 3121 is 0.025-0.3mm, and the width of intermediate pair grid line 3122 is 0.015-0.15mm。
That is, in this application, the width of edge pair grid line 3121 is wider than the width of intermediate secondary grid line 3122.By This, it is ensured that the bonding strength of edge pair grid line 3121 and conductor wire 32, and being connected with conductor wire 32 with bigger Solderable region.
Solar cell chip arrays 30 according to the embodiment of the present application are described below.
Include multiple solar battery cells, solar cell according to the solar cell 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 cell chip arrays 30 of embodiment also have corresponding technique effect, i.e. edge pair grid line 3121 and conductor wire 32 Bonding strength bigger, and the join domain being connected with conductor wire 32 with bigger, convenient for conductor wire 32 and edge pair grid Connection between line 3121.
Specifically, in the application some embodiments, conductor wire 32 is made of wire S, and wire S is in adjacent cell piece Reciprocation extension between the surface and the surface of another cell piece 31 of a cell piece 31 in 31.
Here, cell piece 31 with by extending in the conductor wire 32 that the wire S on 31 surface of cell piece is constituted constitute electricity In other words pond piece is made of according to the solar cell chip arrays 30 of the embodiment of the present application multiple cell pieces, multiple cell pieces Conductor wire 32 is made of wire S 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 ", can refer to wire S extends between the surface of cell piece 31 along reciprocal stroke.
In this application, " surface of a cell pieces 31 of the wire S in adjacent cell piece 31 and another cell piece Reciprocation extension between 31 surface " should broadly understood, for example, wire S can be with reciprocation extension in adjacent cell piece 31 Between the surface and the surface of another cell piece 31 of one cell piece 31, wire S can also be from first cell piece 31 Surface extends through 31 surface of intermediate cell piece of predetermined quantity to the surface of the last one cell piece 31, then from the last one The surface of cell piece 31 returns to and extends through the surface of the intermediate cell piece 31 of the predetermined quantity to first cell piece 31 Surface, so repeat.
In addition, when cell piece 31 is by wire S parallel connections, wire S can with reciprocation extension on the front of cell piece, In the case, wire S constitutes the front side conductive line 32A of cell piece, and optionally, wire S reciprocation extensions are in cell piece 31 Front on and different wire S reciprocation extensions on the back side of cell piece 31, in the case, extending in cell piece 31 just Wire S on face constitutes front side conductive line 32A, and the wire S for extending in the back side of cell piece 31 constitutes back side conductor wire 32B。
When cell piece 31 is one another in series by wire S, one in adjacent cell piece 31 of wire S reciprocation extensions Between the front of cell piece 31 and the back side of another cell piece 31, in the case, wire S a cell piece 31 just The part extended on face constitutes the part that front side conductive line 32A, wire S extend on the back side of another adjacent cell piece 31 Constitute back side conductor wire 32B.In this application, unless expressly stated otherwise, conductor wire 32 can be understood as front side conductive line 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 wire S and extend " one is reciprocal " forming two conductor wires 32, and two Since 321 reciprocal coiling of wire forms U-shaped structure or v-shaped structure between root conductor wire 32, but the application is not 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 S is constituted, and is connected by conductor wire 32 between adjacent cell piece 31, and therefore, the solar battery sheet list of the application uses wire Manufactured member 32 extracted current of conductor wire, main gate line extracted current, battery unit are printed as without using expensive silver paste Cost substantially reduce, and the manufacturing process of the solar battery sheet of the application is simple, and cell piece is connected without using welding, The secondary grid line 312 and back electrode of wire S and cell piece it is easy to connect.
Further, since conductor wire 32 is made of the wire S of reciprocation extension, (i.e. wire is in electricity for the width of conductor wire 32 The width of the projection of pond on piece) it is far smaller than the width for the main gate line that existing printing silver paste is formed, reduce conductor wire 32 Shading-area, moreover, the quantity of conductor wire 32 can be adjusted easily, compared with the conductor wire that silver paste is formed, conductor wire 32 Resistance reduces, and improves photoelectric conversion efficiency.Since wire S reciprocation extensions form conductor wire, battery chip arrays 30 are being used When manufacturing solar cell module 100, wire S is easier to accurately control, and is not easy to shift, i.e., " drift is less likely to occur wire Move ", photoelectric conversion efficiency is not interfered with, photoelectric conversion efficiency is further improved.Therefore, according to the sun of the embodiment of the present application Can battery chip arrays 30, it is at low cost, photoelectric conversion efficiency is high.
Below with reference to the accompanying drawings solar cell chip arrays 30 according to the application specific embodiment are described.
With reference to figure 1-3 descriptions according to the solar cell chip arrays 30 of one specific embodiment of the application.
In the embodiment shown in Fig. 1-3, show in other words two cell pieces of solar cell chip arrays 30 show Two cell pieces 31 being connected with each other by the conductor wire 32 being made of wire S are gone out.
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 of the body 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, can also be the back side similar to the secondary grid line 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.
When multiple solar battery cells, which are connected, constitutes solar cell chip arrays 30, the secondary grid of two neighboring cell piece In line 312, wire reciprocation extension on two neighboring cell piece, and wire two neighboring cell piece away from each other Side turn back.Since deformational stress of the wire at curved bend folding part is bigger, secondary grid line herein needs Widen.
I.e. when two cell pieces are linked together by the conductor wire of reciprocal coiling, generally requires and cell piece is located at The edge pair grid line widening treatment of outer ledge, that is, as a whole with two cell pieces, the edge pair grid line of outer ledge adds Width, i.e., when two cell pieces are arranged in the lateral direction, the edge pair grid line positioned at the left side of the cell piece on the left side is added Width, the edge pair grid line positioned at the right side of the cell piece on the right are widened.
Specifically, in one embodiment of the application, positive and another battery of wire in a cell piece 31 Reciprocation extension between the back side of piece 31.
As shown in Figs. 1-3, in this embodiment, solar cell 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), wire S reciprocation extensions are the first cell piece 31A's Front (light-receiving surface, the upper surface in Fig. 2) is the back side of the second cell piece 31B between, and it is electric to constitute first by wire S as a result, The back side conductor wire 32B of the front side conductive line 32A of pond piece 31A and the second cell piece 31B, wire S and the first cell piece 31A Secondary grid line electrical connection and be electrically connected with the back electrode of the second cell piece 31B.
Specifically, in two adjacent cell pieces, the first cell piece 31A and the second cell piece 31B include respectively electricity Pond sheet matrix 311 and the positive secondary grid line 312 for being located at battery sheet matrix 311, wire in the front of the first cell piece 31A and The back side reciprocation extension of second cell piece 31B.
Wherein, in the secondary grid line 312 of the battery sheet matrix 311 of the first cell piece 31A, one far from the second cell piece 31B The secondary grid line 312 of side is formed as edge pair grid line 3121, and the width of the edge pair grid line 3121 is more than the width of remaining secondary grid line 312 Degree, conductor wire 32 in the position bending when, be connected with the edge pair grid line 3121 of the position, weld strength can be effectively ensured. And 3121 line width of edge pair grid line of remaining position is consistent with intermediate secondary grid line 3122, then it can be to avoid increase shading surface Product ensures photoelectric conversion efficiency.
In one embodiment of the application, the back side of pond sheet matrix 311 is equipped with back electrode 314, wire and back electrode 314 are 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 body of the battery sheet matrix 311 The back electrode 314 in face is weldingly connected.
In some embodiments, wire S be one, wire S the first cell piece 31A and the second cell piece 31B it Between reciprocation extension 10-60 times, it is preferable that as shown in Figure 1, wire reciprocation extension 12 times is to form 24 conductor wires, and gold It is single to belong to silk, and in other words, 24 conductor wires of formation of single metal wire reciprocation extension 12 times, the spacing between adjacent conductive line can Think 2.5 millimeters -15 millimeters.According to this embodiment, compared with the main gate line of conventional batteries piece, quantity increases, to reduce Distance of the electric current from secondary grid line to conductor wire, reduces resistance, improves electricity conversion.In the embodiment shown in fig. 1, 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 Conductor wire 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 as shown in figure 4,321 outside of wire is coated with welding layer 322, the welding that wire passes through cladding Layer is welded with secondary grid line and/or back electrode, is convenient for being electrically connected for wire and pair grid line and/or back electrode as a result, is avoided connecting 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 before being laminated in the lamination process of pond component.
In some embodiments it may be preferred that before wire is contacted with cell piece, wire prolongs in a tensioned state It stretches, i.e., stretches wire, 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 body 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 body 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 descriptions according to the solar cell chip arrays 30 of another embodiment of the application.
Include n × m cell piece 31, in other words, Duo Ge electricity according to the solar cell 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 row 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 figure 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, wire reciprocation extension is on the surface of a cell piece 31 and another adjacent battery 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 rows Between surface and the surface of a cell piece 31 in a+1 rows, and m-1 >=a >=1.
As shown in fig. 6, in specific example, in same row's cell piece 31, wire reciprocation extension is in a battery 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 positioned at the end that a is arranged Between the back side of a cell piece 31 of the end of a+1 rows, thus adjacent two rows of cell pieces 31 are one another in series.
Wherein, in multiple secondary grid lines 312 of multiple cell pieces, the process of conductor wire 32 and conductor wire 32 turn back Side pair grid line 312 is formed as edge pair grid line 3121, these edge pair grid lines 3121 are located at the position of wire bending, the portion Point edge pair grid line 3121 carry out widening treatment, and positioned at the other side edge pair grid line 3121 width can then keep with The equivalent width of intermediate pair grid line 3122 is playing effectively enhancing conductor wire 32 and the effect of the bonding strength of secondary grid line 312 Meanwhile it can ensure photoelectric conversion efficiency to avoid shading-area is increased.It is highly preferred that in adjacent two rows of cell pieces 31, metal Silk reciprocation extension is on the surface of the cell piece 31 positioned at the end that a is arranged and the battery positioned at the end of a+1 rows Between the surface of piece 31, the end of a rows is located at the same side of matrix with the end arranged a+1, such as in Fig. 6 In, it is located 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 Between the back side in the front of the 5th cell piece 31 in extension second row and second row between the 4th cell piece 31, with such It pushes away, until the front of the second cell piece 31 in the 11st one metal wire reciprocation extension second row and the first cell piece in 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, third is arranged successively 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 the first cell piece 31 of first row and the left side of the first cell piece 31 of the 6th 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, It can be between second row and third row, the diode in parallel for preventing spottiness, two poles between the 4th row and the 5th row The connection of pipe may be used that 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, It can be arranged in the left or right side of respective row and busbar is respectively set.
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 that the front reciprocation extension of piece 31 passes through the second to the 6th cell piece 31.
In some specific implementation modes of the application, the binding force between wire and cell piece 31 is in 0.1-0.8 oxen 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, golden Belong to the binding force between silk and cell piece 31 in the range of 0.2-0.6 newton, firm welding between cell piece and wire, battery Piece is operating and is being less prone to desoldering in transfer process, is less prone to poor contact, performance declines, while cost is relatively low.
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 of welding layer and conductor wire 32 (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 partly coat wire.Work as welding When layer segment coats wire, 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, the thickness of welding layer is 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 alloys, In-Sn alloys, Sn-Pb alloys, Sn-Bi-Pb alloys, Sn- At least one of Bi-Ag alloys, In-Sn-Cu alloys, Sn-Bi-Cu alloys and Sn-Bi-Zn alloys.Most preferably, low melting point Alloy is Bi-Sn-Pb alloys, such as it is the conjunction that 55 weight % and Pb contents are 5 weight % that Sn contents, which are 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 Can be 0.01-0.5mm2.Wire can be wire commonly used in the art, such as copper wire.
Below with reference to Figure 10 and Figure 11 descriptions according to the solar cell module 100 of the embodiment of the present application.
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) may be used this field and routinely make 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 can be respectively transparent plank, such as glass plate.
It, can be first by the secondary grid line and the back of the body 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 is welded with secondary grid line It connects, front adhesive film 20 and conductor wire 32 are in direct contact and are filled between adjacent conductor wire 32.
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 extensions exist On the surface of two adjacent cell pieces 31.
Conductor wire 32 is electrically connected with cell piece 31, wherein the front adhesive film 20 and conductor wire 32 being located on cell piece 31 It is in direct contact 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, to avoid conductor wire 32 from being aoxidized, it ensure that opto-electronic 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 cost；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 extensions The radical of conductor wire 32 can greatly improve, prepare simple, can produce in batches；Front adhesive film 20 is direct with conductor wire 32 It contacts and is filled between adjacent conductor wire 32, can be avoided effectively by the isolations such as conductor wire 32 and outside air, steam Electricity conversion can be effectively ensured in the oxidation of conductor wire 32.
In some specific implementation modes of the application, a cell pieces 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 is in direct contact and between the adjacent conductive line 32 that is filled on the front of a cell piece 31, back side adhesive film 40 with it is another The conductor wire 32 at the back side of one cell piece 31 is in direct contact and is filled in the adjacent conductive line at the back side of another cell piece 31 Between 32.
That is, in this application, adjacent two 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 phases of another cell piece 31 Even.
Wherein, the front adhesive film 20 and the 31 positive gold of cell piece on cell piece 31 that front is connected with wire S Belong to silk S to be in direct 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 The wire S at film layer 40 and 31 back side of cell piece is in direct contact and is filled between adjacent conductor wire 32 (such as Fig. 2 institutes 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 implementation modes 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 milliohms, the excellent electrical property of battery when for 72.
In some specific implementation modes 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 pieces, 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 implementation modes 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 implementation modes of the application, the size for conventional cell piece is 156mm × 156mm；Too It is positive can the operating voltage of battery component be 31.5-32V/60 pieces, 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 implementation modes 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 pieces.
Below with reference to Fig. 7-9 descriptions according to the preparation method of the solar cell module 100 of the embodiment of the present application.
Preparation method according to the solar cell module 100 of the embodiment of the present application includes：
Cell piece 31 is provided, cell piece 31 includes battery sheet matrix 311 and is located at more on the front of battery sheet matrix 311 A pair grid line 312, the edge pair grid line 312 of secondary grid line 312 including 311 edge of adjacent cells sheet matrix and is located at edge pair grid line The intermediate secondary grid line 312 of 312 insides, secondary grid line 312 are equipped with weld part 3123, at least one welding of edge pair grid line 312 The area of projection of the portion 3123 on battery sheet matrix 311 is more than the area of the projection of the weld part 3123 of intermediate secondary grid line 312. Well known to those skilled in the art, secondary grid line can generally be formed by printing silver paste, and the arrangement of secondary grid line and shape can pass through The setting of printing screen plate and obtain, that is, the secondary grid line for how obtaining different in width or shape is known to the skilled person, This is not described in detail.
The conductor wire 32 being made of wire is connected with secondary grid line 312 to obtain solar cell list in weld part 3123 Member.
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.
Specifically, in multiple secondary grid lines 312 of multiple cell pieces, there is the process of conductor wire 32 and conductor wire 32 is turned back The secondary grid line 312 of side be formed as edge pair grid line 3121, these edge pair grid lines 3121 are located at the position of wire bending, The edge pair grid line 3121 of the part carries out widening treatment, and the width of the edge pair grid line 3121 positioned at the other side can then be protected The equivalent width with intermediate secondary grid line 3122 is held, in the effect for playing effectively enhancing conductor wire 32 and the bonding strength of secondary grid line 312 While fruit, it can ensure photoelectric conversion efficiency to avoid shading-area is increased.
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 fluid sealant, and fastened said elements using U-frame Together, this it is known to those skilled in the art that, be not detailed herein.
The preparation of solar cell 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 wire reciprocation extension 12 times.Then, as shown in figure 8, it is accurate Standby first cell piece 31 and the second cell piece.Next, as shown in figure 9, the front of the first cell piece 31 is connected with wire And the back side of the second cell piece 31 is connected with wire, battery chip arrays 30 are consequently formed, two cell pieces are shown in Fig. 9 31, as described above, when battery chip arrays 30 have multiple cell pieces 31, using the wire of reciprocation extension by a cell piece 31 front 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 another battery The back electrode of piece 31 is connected with wire.Wire is reciprocal under two clips tensioning of this two end of root silk by being located at Extend, which only needs two clips that coiling can be realized, greatly reduce the dosage of clip, save assembly 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 the back of the body 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 can with cell piece 31 With welding, the connection of wire and cell piece 31 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 is in direct contact placement with conductor wire 32, and in lamination, front adhesive film 20 melts filling conductor wire Gap between 32.Back side adhesive film 40 is in direct contact 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 100 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 The cross-sectional area of silk is 0.04mm2, the thickness of alloy-layer is 16 microns, to which wire S be made.
(2) solar cell module 100 is prepared
The POE adhesive films (melt temperature is 65 DEG C) that size is 1630 × 980 × 0.5mm are provided, and ruler is correspondingly provided Very little is the glass plate of 1633 × 985 × 3mm mm and the polycrystalline silicon battery plate 31 that 60 chip sizes are 156 × 156 × 0.21mm.Electricity There are pond piece 31 91 secondary grid lines, every secondary grid line substantially to run through cell piece 31 in the longitudinal direction, and between adjacent pair grid line Distance is 1.7mm, and the back side of cell piece 31 has 5 back electrodes (material is tin, and width is 1.5 millimeters, and thickness is 10 microns), Every back electrode substantially runs through cell piece 31 in the longitudinal direction, and the distance between adjacent two back electrodes are 31mm.
Wherein, 312 material of secondary grid line is silver, and weld part 3123, multiple pair grid lines are respectively equipped on each pair grid line 312 In 312, the projected area of the weld part 3123 of the edge pair grid line 3121 of neighbouring one side edge is 0.3mm2, remaining secondary grid line The projected area of 312 weld part 3123 is 0.05mm2, thickness is 9 microns.
60 cell pieces 31 are arranged with a matrix type (6 rows 10 row), two adjacent cell pieces 31 in same row Between, keep an one metal wire reciprocal in the state of tension between the front and the back side of another cell piece of a cell piece 31 Extend, wherein on two adjacent cell pieces 31, the edge pair grid line 3121 that width is widened is located at the position for having wire to pass through Set with welded wire.
Wire is tensioned lower reciprocation extension by being located at two clips of this two end of root silk, to form 15 Parallel conductor wire, and by the secondary grid line of a cell piece 31 and conductive wire bonding, by the back electrode of another cell piece 31 with Conductive wire bonding, welding temperature are 160 DEG C, and the distance between adjacent conductive line being mutually parallel is 9.9mm.To 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 films, in the matrix form arrangement and with multiple cell pieces of welded wire, Lower POE adhesive films and lower glass plate stack successively from top to bottom, wherein the light-receiving surface of cell piece 31 is made to face front adhesive film 20, front adhesive film 20 is in direct contact with conductor wire 32, so that the back side of cell piece 31 is faced back side adhesive film 40, is subsequently placed into layer It is laminated in press, front adhesive film 20 is filled between adjacent conductor wire 32, to which solar cell module A1 be made.
Comparative examples 1
Comparative examples 1 and example 1 difference lies in：
The projected area of weld part 3123 on cell piece 31 on all secondary grid lines 312 is identical, is 0.05mm2.Gold Belong to silk between the front and the back side of another cell piece of a cell piece 31 the state reciprocation extension of tension and with secondary grid Line 312 welds.To which solar cell module D1 be made.
Example 2
Example 2 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 about 125 DEG C), wherein The cross-sectional area of copper wire is 0.03mm2, the thickness of alloy-layer is 10 microns, to which wire S be made.
(2) solar cell module is prepared
The EVA adhesive film layer (melt temperature is 60 DEG C) that size is 1630 × 980 × 0.5mm is provided, it is 1633 to provide size The glass plate of × 985 × 3mm mm and the polycrystalline silicon battery plate 31 that 60 chip sizes are 156 × 156 × 0.21mm.Cell piece 31 Light-receiving surface is equipped with 91 secondary grid lines, and every secondary grid line substantially runs through cell piece 31, and adjacent two secondary grid lines in the longitudinal direction The distance between be 1.7mm, the back side of cell piece 31 is equipped with 5 back electrodes, and (material is tin, and width is 1.5 millimeters, and thickness is 10 microns), and every back electrode substantially runs through cell piece 31 in the longitudinal direction, and the distance between adjacent two back electrodes are 31mm。
Wherein, 312 material of secondary grid line is silver, and weld part 3123, multiple pair grid lines are respectively equipped on each pair grid line 312 In 312, the projected area of the weld part 3123 of the edge pair grid line 3121 of neighbouring one side edge is 0.6mm2, remaining secondary grid line The projected area of 312 weld part 3123 is 0.08mm2, thickness is 9 microns.
Cell piece 31 is arranged with a matrix type, and between two adjacent cell pieces 31, makes wire at one It is parallel to form 20 in the state reciprocation extension of tension between the front of cell piece 31 and the back side of another cell piece Conductor wire, and by the secondary grid line of a cell piece 31 and conductive wire bonding, by the back electrode and conductor wire of another cell piece 31 Welding, and the distance between adjacent conductive line being mutually parallel is 7mm.Then, by upper glass plates, upper POE adhesive films, with matrix Form is arranged and is stacked successively from top to bottom with multiple cell pieces of welded wire, lower POE adhesive films and lower glass plate, In, so that the light-receiving surface of cell piece 31 is faced front adhesive film, so that the back side of cell piece 31 is faced back side adhesive film, be subsequently placed into layer It is laminated in press, to which solar cell module A2 be made.
Example 3
Prepare solar cell module according to the method for example 2, with example 2 difference lies in：312 material of secondary grid line is Silver, is respectively equipped with weld part 3123 on each pair grid line 312, in multiple pair grid lines 312, the edge pair grid line of neighbouring one side edge The projected area of 3121 weld part 3123 is 1mm2, the projected area of the weld part 3123 of remaining secondary grid line 312 is 0.15mm2, Thickness is 9 microns.To which solar cell module A3 be made.
Performance test：
(1) observe whether the secondary grid line at cell piece edge and conductor wire have rosin joint phenomenon by naked-eye observation method.
(2) the solder bond power test between edge pair grid line and wire：
Welding in test solar cell module A1-A5 and D1 between wire and cell piece pair grid line 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 both sides of wire so that cell piece is not pulled up when test；
2, wire is clipped on the draw ring of tensiometer, direction of pull and cell piece angle at 45 °；
3, start tensiometer, make tensiometer vertically upward uniform motion, by wire from the pull-up of cell piece surface, The pulling force data that measures of tensiometer when record wire is detached from, it is the wire between cell piece pair grid line to take its mean value Solder bond force data.
(3) photoelectric conversion efficiency is tested：
Above-mentioned example and comparative examples are prepared too using single flash operation simulator according to method disclosed in IEC904-1 Positive energy battery component is tested, and test condition is standard test condition (STC)：Light intensity is 1000W/m2；Spectrum is 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
With the presence or absence of rosin joint Nothing Nothing Nothing Nothing
Solder bond power/N 0.32 0.1 0.41 0.58
Photoelectric conversion efficiency (%) 16.3 15.4 16.8 17.1
The solar cell module of the embodiment of the present application it can be seen from the result of table 1, it is conductive at the edge of cell piece Solder bond power is good between line and edge pair grid line, and weld strength is high, is not in desoldering or rosin joint, and can obtain phase To higher photoelectric conversion efficiency.
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, do not indicate or imply the indicated device or element must have a particular orientation, with spy Fixed azimuth configuration and operation, therefore be not considered as limiting the invention.
In addition, term " first ", " second " are used for description purposes only, it is not understood to indicate or imply 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 this feature.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 connects, and can also be electrical connection；It can be directly connected, can also can be indirectly connected through an intermediary two members 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 the "upper" of second feature or "lower" It may include that the first and second features are in direct contact, can also not be to be in direct contact but pass through it including the first and second features Between other characterisation contact.Moreover, fisrt feature second feature " on ", " top " and " above " include first special Sign is right over second feature and oblique upper, or is merely representative of fisrt feature level height and is higher than second feature.Fisrt feature exists Second feature " under ", " lower section " and " following " include fisrt feature right over second feature and oblique upper, or be merely representative of Fisrt feature level 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 embodiments or example 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 of can make changes, modifications, alterations, and variations to the above described embodiments within the scope of the invention.

Claims (34)

1. a kind of solar battery cell, which is characterized in that including：
Cell piece, the cell piece include battery sheet matrix and multiple secondary grid lines for being located on the front of the battery sheet matrix, The pair grid line include the edge pair grid line of the neighbouring cell piece matrix border and on the inside of the edge pair grid line in Between secondary grid line, the pair grid line is equipped with weld part, and at least one weld part of the edge pair grid line is in the battery chip base The area of projection on body is more than the area of the projection of the weld part of the intermediate secondary grid line；
Multiple conductor wires, the multiple conductor wire are separated from each other setting, and the conductor wire is in the weld part and the secondary grid Wire bonding；
Width of the weld part of the edge pair grid line on the direction for being orthogonal to the secondary grid line is more than the intermediate secondary grid line Weld part width.
2. solar battery cell according to claim 1, which is characterized in that the width of the weld part of the edge pair grid line Degree is 0.08-0.6mm.
3. solar battery cell according to claim 2, which is characterized in that the width of the weld part of the edge pair grid line Degree is 0.15-0.3mm.
4. solar battery cell according to any one of claim 1-3, which is characterized in that the edge pair grid line exists The width of part between adjacent solder portion is equal to the width of part of the intermediate secondary grid line between adjacent solder portion.
5. solar battery cell according to claim 4, which is characterized in that the edge pair grid line is in adjacent solder portion Between part width be 0.015-0.03mm.
6. solar battery cell according to any one of claim 1-3, which is characterized in that the edge pair grid line The length of weld part is more than the length of part of the edge pair grid line between adjacent solder portion.
7. solar battery cell according to claim 6, which is characterized in that the length of the weld part of the edge pair grid line The length ratio of the part of degree and the edge pair grid line between adjacent solder portion is 1.05-1.3:1.
8. solar battery cell according to any one of claim 1-3, which is characterized in that the edge pair grid line is The secondary grid line of the side of the neighbouring battery sheet matrix.
9. solar battery cell according to any one of claim 1-3, which is characterized in that the neighbouring battery chip base Edge pair grid line of the body per side is the secondary grid lines of 1- the 5th since outermost.
10. solar battery cell according to claim 9, which is characterized in that the neighbouring each side of battery sheet matrix Edge pair grid line be the 1st to the 3rd since outermost secondary grid line.
11. solar battery cell according to claim 10, which is characterized in that the neighbouring each side of battery sheet matrix Edge pair grid line be the 1st to the 2nd since outermost secondary grid line.
12. solar battery cell according to any one of claim 1-3, which is characterized in that the edge pair grid line Width be more than the width of the intermediate secondary grid line.
13. solar battery cell according to any one of claim 1-3, which is characterized in that the edge pair grid line On weld part projected area be 0.1-1.2mm2, the projected area of the weld part on the intermediate secondary grid line is 0.01- 0.2mm2。
14. a kind of solar cell chip arrays, which is characterized in that including multiple battery units, the battery unit is according to power Profit requires the solar battery cell described in any one of 1-13, passes through the conductor wire between the cell piece of adjacent cell It is connected.
15. solar cell chip arrays according to claim 14, which is characterized in that the conductor wire is by wire structure At between the surface and the surface of another cell piece of a cell piece of the wire in the cell piece of adjacent cell piece Reciprocation extension.
16. solar cell chip arrays according to claim 15, 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.
17. solar cell chip arrays according to claim 15, which is characterized in that on the back side of the battery sheet matrix Equipped with back electrode, the wire is connected with the back electrode of another cell piece.
18. the solar cell chip arrays according to any one of claim 15-17, which is characterized in that the wire Reciprocation extension 10-60 times between the front of one cell piece and the back side of another cell piece.
19. the solar cell chip arrays according to any one of claim 15-17, which is characterized in that adjacent conductive line Between spacing be 2.5-15mm.
20. the solar cell chip arrays according to any one of claim 15-17, which is characterized in that adjacent conductive line Form U-shaped or v-shaped structure.
21. solar cell chip arrays according to claim 15, which is characterized in that the cell piece is arranged into n × m's Matrix form, wherein n are columns, and m is number of rows,
In same row's cell piece, the wire reciprocation extension is on the surface of a cell piece and another adjacent cell piece Between surface, in adjacent two rows of cell pieces, the wire reciprocation extension a row in a cell piece surface with Between the surface of a cell piece in a+1 rows, and m-1 >=a >=1.
22. solar cell chip arrays according to claim 21, 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 positioned at the end that a is arranged and an end for being located at a+1 rows Between the surface of cell piece, the end of a rows is located at the same of the matrix with the end that the a+1 is arranged Side.
23. solar cell chip arrays according to claim 21, 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 the cell piece positioned at the end that a is arranged just Between face and the back side of a cell piece positioned at the end of a+1 rows, with adjacent two rows of cell piece of connecting.
24. the solar cell chip arrays according to any one of claim 21-23, which is characterized in that reciprocation extension exists Wire between the adjacent cell piece of same row is one, and wire of the reciprocation extension between the cell piece of adjacent row is One.
25. solar cell chip arrays according to claim 15, which is characterized in that the wire is one.
26. solar cell chip arrays according to claim 15, which is characterized in that be coated with welding on the wire Layer.
27. solar cell chip arrays according to claim 26, which is characterized in that the thickness of the welding layer with it is described The diameter ratio of wire is 0.02-0.5：1.
28. solar cell chip arrays according to claim 26, which is characterized in that the welding layer contains Sn and choosing From at least one of Bi, In, Ag, Sb, Pb and Zn.
29. solar cell chip arrays according to claim 26, which is characterized in that the welding layer contain Sn, Bi with And selected from least one of In, Ag, Sb, Pb and Zn.
30. solar cell chip arrays according to claim 26, which is characterized in that the thickness of the welding layer is 1- 100 microns.
31. 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 Row, back side adhesive film and backboard, the battery chip arrays are the solar battery sheet battle array described in any one of claim 15-30 Row.
32. a kind of preparation method of solar cell module, which is characterized in that including：
There is provided cell piece, the cell piece includes battery sheet matrix and multiple secondary grid for being located on the front of the battery sheet matrix Line, the pair grid line includes adjacent to the edge pair grid line of the cell piece matrix border and on the inside of the edge pair grid line Intermediate pair grid line, the pair grid line are equipped with weld part, and at least one weld part of the edge pair grid line is in the cell piece The area of projection on matrix is more than the area of the projection of the weld part of the intermediate secondary grid line；
The conductor wire being made of wire is connected with the secondary grid line to obtain solar battery cell in the weld part；
Upper cover plate, front adhesive film, the solar battery cell, back side adhesive film and backboard are stacked successively, and made described The front of solar battery cell faces front adhesive film, and the back side of the solar battery cell is made to face back side adhesive film, Then it is laminated to obtain the solar cell module；
Width of the weld part of the edge pair grid line on the direction for being orthogonal to the secondary grid line is more than the intermediate secondary grid line Weld part width.
33. the preparation method of solar cell module according to claim 32, which is characterized in that the cell piece is more It is a, it is connected by the conductor wire between adjacent cell piece by forms any one of claim 14-30 solar cells Chip arrays.
34. the preparation method of solar cell module according to claim 32, which is characterized in that the wire is reciprocal It extends on the surface of the cell piece.
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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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US14/738,322 US20160126372A1 (en) 2014-10-31 2015-06-12 Solar cell array, solar cell module and manufacturing method thereof
US14/738,368 US20160126388A1 (en) 2014-10-31 2015-06-12 Solar cell array, solar cell module and manufacturing method thereof
US14/738,637 US20160126373A1 (en) 2014-10-31 2015-06-12 Method for manufacturing solar cell module
US14/738,409 US10529868B2 (en) 2014-10-31 2015-06-12 Solar cell array, solar cell module and manufacturing method thereof
US14/738,516 US20160126389A1 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
US14/738,677 US10381493B2 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
US14/738,390 US20160126363A1 (en) 2014-10-31 2015-06-12 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
US14/738,664 US20160126390A1 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
PCT/CN2015/084060 WO2016065939A1 (en) 2014-10-31 2015-07-15 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
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