CN106206763A - Solar battery cell, cell piece array, battery component and preparation method thereof - Google Patents

Solar battery cell, cell piece array, battery component and preparation method thereof Download PDF

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Publication number
CN106206763A
CN106206763A CN201510218574.0A CN201510218574A CN106206763A CN 106206763 A CN106206763 A CN 106206763A CN 201510218574 A CN201510218574 A CN 201510218574A CN 106206763 A CN106206763 A CN 106206763A
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CN
China
Prior art keywords
cell piece
back side
tinsel
cell
row
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CN201510218574.0A
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Chinese (zh)
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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Publication date
Application filed by BYD Co Ltd filed Critical BYD Co Ltd
Priority to US14/738,516 priority Critical patent/US20160126389A1/en
Priority to US14/738,664 priority patent/US20160126390A1/en
Priority to US14/738,587 priority patent/US10193003B2/en
Priority to US14/738,677 priority patent/US10381493B2/en
Priority to US14/738,322 priority patent/US20160126372A1/en
Priority to US14/738,578 priority patent/US10069019B2/en
Priority to US14/738,390 priority patent/US20160126363A1/en
Priority to US14/738,637 priority patent/US20160126373A1/en
Priority to US14/738,244 priority patent/US20160126361A1/en
Priority to US14/738,368 priority patent/US20160126388A1/en
Priority to US14/738,409 priority patent/US10529868B2/en
Priority to PCT/CN2015/084061 priority patent/WO2016065940A1/en
Priority to US14/928,863 priority patent/US20160126391A1/en
Publication of CN106206763A publication Critical patent/CN106206763A/en
Pending legal-status Critical Current

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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 a kind of solar battery cell, solaode chip arrays, solar module and the preparation method of solar module, solar battery cell includes: cell piece, cell piece includes cell piece matrix, is spaced the secondary grid line being located on cell piece front side of matrix of turning up the soil, the back of the body electric field being located on the cell piece matrix back side and is spaced the back side weld part being located on back of the body electric field of turning up the soil, and back side weld part is formed by applying silver slurry or ashbury metal on back of the body electric field；Front side conductive line, front side conductive line is made up of tinsel and electrically connects with front pair grid line；Back side conductor wire, back side conductor wire is made up of tinsel and is electrically connected with back of the body electric field by back side weld part.According to the solar battery cell of the embodiment of the present application, back side conductor wire is weldingly connected with the back side weld part starched by silver or ashbury metal is formed, and can be greatly improved the switching performance of back side conductor wire and back of the body electric field.

Description

Solar battery cell, cell piece array, battery component and preparation method thereof
Technical field
The application relates to area of solar cell, more particularly to solar battery cell, solaode chip arrays, the sun Energy battery component and preparation method thereof.
Background technology
Solar module is one of vitals of device of solar generating.Sunlight from the front illuminated of cell piece to electricity On the sheet of pond, cell piece includes that cell piece and the conductor wire being located on cell piece front and secondary grid line, conductor wire and secondary grid line cover The part in the front of cell piece, thus can block a part of sunlight, impinge upon solar energy on conductor wire and secondary grid line without Method is transformed into electric energy, accordingly, it would be desirable to main grid and secondary grid are the thinnest more good.But, the effect of conductor wire and secondary grid line is conduction Electric current, from the point of view of resistivity, conductor wire and secondary grid line more detailed rules and regulations conduction cross-sectional area are the least, and ohmic loss is the biggest.Cause This conductor wire and secondary grid line design need to obtain balance, cost to be considered between shading and conduction.
Summary of the invention
The application is to make following facts and the discovery of problem and understanding based on applicant:
In correlation technique, the front of solar battery sheet is usually provided with main gate line and secondary grid line, is used for deriving cell piece and passes through Electric current produced by photoelectric effect or Photochemical effects.In order to improve the efficiency of cell piece, current solaode manufacturer All it is being devoted to study how to improve the quantity of main gate line.Main grid is successfully brought up to 3 from 2 by prior art, Even improve to 5.
But, in prior art, main gate line is to be mainly composed of the slurry of expensive silver by printing to be prepared from, Therefore, its preparation cost is the highest, and the radical increasing silver main gate line necessarily causes the increase of cost.Meanwhile, existing silver is main The width of grid line is big (such as, width reaches more than 2mm), and the radical increasing silver main gate line also can increase to shading-area, causes The conversion efficiency of cell piece reduces.
Therefore, from reducing cost, the angle reducing shading-area is set out, and will originally be printed on cell piece in correlation technique Silver main gate line replaces with tinsel, such as copper wire, is welded with secondary grid line by copper wire, and then copper wire is as conductor wire derived current. Owing to not in use by silver main gate line, its cost can be greatly reduced, simultaneously because the diameter of copper wire is less, it is possible to reduces shading Area, therefore, it can further the quantity of conductor wire be risen to 10.This cell piece is properly termed as dereliction grid cell sheet. Wherein, the silver-colored main grid during tinsel substituted for conventional solar cell sheet and welding.
Present inventor finds through long-term research experiment, pulls out many parallel tinsels, so if used simultaneously After many one metal wires are cut off, then be soldered to simultaneously fixing for many one metal wires on cell piece.This kind of mode is due to equipment and system The restriction of standby precision, technique etc., such as, due to the effect of stress, when solar battery sheet is placed in a free state, be to have Certain bending, it is therefore desirable to tinsel keeps certain rate of tension cell piece could be flattened (it is demonstrated experimentally that to string diameter 0.2mm Copper wire for, its minimum tensile force 2N to be had).For keeping this tensile force, need to arrange at every one metal wire two ends The device of similar clip, this device needs to take certain space, and the space of cell piece is limited, therefore, existing skill Art at most can only pull out at present on a cell piece and the tinsel of fixing welding about 10 simultaneously, be further added by tinsel Radical extremely difficult.Because tinsel radical is the most, its free end is the most, and equipment needs to control more metal simultaneously Silk, wire-drawing equipment is required the highest by this.Meanwhile, the limited space of solar battery sheet, such as, general single battery sheet A size of 156mm*156mm, needs the most accurately to control many one metal wires in the most limited space, and this is to equipment requirements The highest, especially the highest to required precision.Therefore, in current actual production, can not control the most simultaneously and weld Connect many one metal wires, by increasing capacitance it is possible to increase the radical of conductor wire the most limited, general the most only about 10, and realize tired Difficult.
In order to solve this problem, prior art (US20100275976, and US20100043863) proposes one will Many one metal wires are fixed on the technical scheme on transparent film layer.I.e., first many parallel tinsels are consolidated by the way of bonding It is scheduled on transparent film layer, then fits on cell piece, finally by layer by being bonded with many parallel hyaline membranes wiry Pressure technique makes tinsel contact with the secondary grid line on cell piece.The program fixes many one metal wires by transparent film layer, solves The problem simultaneously controlling many one metal wires, can increase radical wiry further, but this scheme has almost abandoned welding Technique, i.e. tinsel are connected with secondary grid line not by welding procedure, but make tinsel and secondary grid line by laminating technology Contact, thus derived current.
Although this scheme can promote radical wiry further, but, due to the existence of transparent film layer, light can be affected Absorb, cause certain shading, thus cause the reduction of conversion efficiency.
The more important thing is, this employing transparent film layer fix scheme wiry be cannot use welding procedure connect tinsel with Secondary grid line.This is because, on the one hand, if using welding procedure, the fusion temperature of transparent film layer have to be higher than welding Temperature (welding temperature is typically at about 140 DEG C).Otherwise, if the fusion temperature of transparent film layer is less than welding temperature, in weldering When connecing, adhesive film can melt, thus lose it and fix effect wiry, and tinsel can drift about, and is substantially reduced Welding effect.But, on the other hand, as well known to those skilled in the art, solar battery sheet needs to be in sealing in use State, to prevent water, air etc. from entering in cell piece, results in burn into short circuit etc.；And existing encapsulating material is general For EVA, its fusing point is generally 70-80 DEG C, well below welding temperature；If employing welding procedure, as it has been described above, thoroughly The fusion temperature of bright film layer needs higher than welding temperature, its inevitable fusing point also above encapsulating material, therefore encapsulation when, Under package temperature, encapsulating material (EVA) melts, and transparent film layer will not melt, thus, when encapsulation, The encapsulating material of fusing is the adhesive film that cannot pass through solid, thus cell piece is completely sealed off, therefore, it seals effect The most excessively poor, actual product is easy to lose efficacy.Therefore, for the angle of encapsulation, the fusion temperature of transparent film layer is needed again Less than welding temperature, this is clearly an antinomy.
Therefore, this employing adhesive film fixes scheme wiry is to use welding procedure to be welded with secondary grid line by tinsel Together, its tinsel only actually simply contacts with the secondary grid line on cell piece, i.e. tinsel simply rides over On secondary grid line.Therefore, the bonding strength of tinsel and secondary grid line is the lowest, in lamination process or during use, and gold Belong to and be very easy to depart between silk and secondary grid line, cause loose contact, thus cause the efficiency of cell piece to be greatly lowered, Even lost efficacy.Therefore, the most real being promoted and commercialization of product of this scheme is used.Therefore, in the market The most ripe dereliction grid solar cell.
Meanwhile, the back side of cell piece matrix is provided with back of the body electric field, and in existing dereliction grid solar cell, tinsel is general Being to use electrocondution slurry to be bonded on the back of the body electric field at the cell piece back side, its adhesion is the least, easily comes off.Simultaneously because Conductor wire is the tinsel that diameter is the least, and it welds more difficulty with the back of the body electric field on the cell piece matrix back side, easily produces Rosin joint, loose contact, thus cause the efficiency of cell piece to be greatly lowered, even lost efficacy.
The application is intended to solve one of above-mentioned technical problem the most to a certain extent.
Many main grids solaode that the application proposes can commercialization, preparation is simple easily to be realized, particularly low cost, equipment Simply, it is possible to batch production.
To this end, the application proposes a kind of solar battery cell, this solar battery cell is simple to manufacture, low cost, photoelectricity Conversion efficiency is high
The application also proposes a kind of solaode chip arrays, and this solaode chip arrays is simple to manufacture, low cost, photoelectricity Conversion efficiency is high.
The application also proposes a kind of solar module with above-mentioned solaode chip arrays, this solar module Be simple to manufacture, low cost, photoelectric transformation efficiency is high.
The application also proposes the preparation method of a kind of above-mentioned solar module.
According to the solar battery cell of the application first aspect embodiment, including: cell piece, described cell piece includes battery Sheet matrix, be spaced turn up the soil be located on described cell piece front side of matrix secondary grid line, be located on the described cell piece matrix back side Back of the body electric field and be spaced the back side weld part being located on described back of the body electric field of turning up the soil, described back side weld part is by the described back of the body Apply silver slurry on electric field or ashbury metal is formed；Front side conductive line, described front side conductive line be made up of tinsel and with described front Secondary grid line electrical connection；Back side conductor wire, described back side conductor wire is made up of tinsel and by back side weld part and described back of the body electricity Field electrical connection.
According to the solar battery cell of the embodiment of the present application, by arranging back of the body electric field at the back side of cell piece matrix and being located at the back of the body Back side weld part on electric field, back side conductor wire is weldingly connected with the back side weld part starched by silver or ashbury metal is formed, Ke Yi great The big switching performance improving back side conductor wire and back of the body electric field, it addition, the solar battery cell production technology of the application is simple, Only need to design screen painting, and low cost.
According to the solaode chip arrays of the application second aspect embodiment, described cell piece array includes multiple cell piece, Described cell piece is the solar battery cell described in above-described embodiment, is connected by tinsel between adjacent cell sheet, described Between surface and the surface of another cell piece of a tinsel cell piece in adjacent cell sheet, reciprocation extension is to constitute institute State front side conductive line and/or described back side conductor wire.
According to the solar module of the application third aspect embodiment, including the upper cover plate being sequentially stacked, front adhesive film, Cell piece array, back side adhesive film and backboard, described cell piece array is according to the solar battery sheet described in above-described embodiment Array.
The preparation method of the solar module according to the application fourth aspect embodiment, including: cell piece is provided, described Cell piece include cell piece matrix, be spaced turn up the soil be located on described cell piece front side of matrix secondary grid line, be located at described electricity Carrying on the back electric field and being spaced the back side weld part being located on described back of the body electric field of turning up the soil on the sheet matrix back side, pond, the described back side is welded Portion is formed by applying silver slurry or ashbury metal on described back of the body electric field；By the front side conductive line being made up of tinsel and described front Secondary grid line is connected and is connected, the back side conductor wire that tinsel is constituted to obtain by described back side weld part with described back of the body electric field Solar battery cell；By upper cover plate, front adhesive film, described solar battery cell, back side adhesive film and backboard successively Stack, and make the front of described solar battery cell in the face of front adhesive film, make the face, the back side of described solar battery cell To back side adhesive film, then carry out lamination and obtain described solar module.
Accompanying drawing explanation
Fig. 1 is the floor map of the solaode chip arrays according to one embodiment of the application.
Fig. 2 is longitudinal schematic cross-section of the solaode chip arrays according to one embodiment of the application.
Fig. 3 is the horizontal schematic cross-section of the solaode chip arrays according to one embodiment of the application.
Fig. 4 is the schematic diagram wiry for forming conductor wire according to the embodiment of the present application.
Fig. 5 is the floor map of the solaode chip arrays according to another embodiment of the application.
Fig. 6 is the floor map of the solaode chip arrays according to the another embodiment of the application.
Fig. 7 is the schematic diagram of the reciprocation extension wiry according to the embodiment of the present application.
Fig. 8 is the schematic diagram of two cell pieces of the solaode chip arrays according to the embodiment of the present application.
Fig. 9 is that two cell pieces shown in Fig. 8 are formed by connecting by tinsel the schematic diagram of solaode chip arrays.
Figure 10 is the schematic diagram of the solar module according to the embodiment of the present application.
Figure 11 is the schematic partial cross-sectional view of solar module shown in Figure 10.
Figure 12 is the schematic diagram of the solaode chip arrays according to the application another embodiment.
Figure 13 is the structural representation of the back side weld part of the solar battery cell according to one embodiment of the application.
Reference:
Cell piece assembly 100；
Upper cover plate 10；
Front adhesive film 20；
Cell piece array 30；Cell piece 31；First cell piece 31A；Second cell piece 31B；Cell piece matrix 311；Secondary grid Line 312；Front pair grid line 312A；Back side pair grid line 312B；Back of the body electric field 313；Back side weld part 314；
Conductor wire 32；Front side conductive line 32A；Back side conductor wire 32B；Tinsel 321；Connecting material layer 322；Short grid line 33；
Back side adhesive film 40；
Lower cover 50.
Detailed description of the invention
Embodiments of the invention are described below in detail, and the example of described embodiment is shown in the drawings, the most identical Or similar label represents same or similar element or has the element of same or like function.Retouch below with reference to accompanying drawing The embodiment stated is exemplary, it is intended to is used for explaining the present invention, and is not considered as limiting the invention.
In this application, in order to more understand and be easy to describe, below part term is explained.
Term " battery unit " includes cell piece 31 and conductor wire 32, and thus, conductor wire 32 is referred to as battery unit Conductor wire 32.
Term " cell piece 31 " includes cell piece matrix 311, the secondary grid line 312 being located on cell piece matrix 311 front, sets Back of the body electric field 313 at the back side of cell piece matrix 311 and the back side weld part 314 being located on back of the body electric field 313, thus, secondary Grid line 312 is referred to as the secondary grid line 312 of battery body 31, and back of the body electric field 313 is referred to as the back of the body of battery body 31 Electric field 313, back side weld part 314 is referred to as the back side weld part 314 of cell piece 31.
" cell piece matrix 311 " such as can be by silicon chip after the operations such as making herbs into wool, diffusion, etching edge, deposited silicon nitride layer The intermediate products obtained, it should be understood that in the application, cell piece matrix 311 is not limited to be made up of silicon chip.
In other words, cell piece 31 includes silicon chip, some of silicon chip surface processes layers, the secondary grid line of sensitive surface and shady face Back of the body electric field 313 and back side weld part 314, or other class solaodes not having front electrode of equivalent.
In this application, battery unit, cell piece 31 and cell piece matrix 311 are intended merely to facilitate description, and can not manage Solve as the restriction to the application.
" solaode chip arrays 30 " is to be formed, in other words, by multiple by conductor wire 32 by the arrangement of multiple cell pieces Cell piece 31 arrangement being connected forms.
In solaode chip arrays 30, tinsel S constitutes the conductor wire 32 of battery unit, and tinsel S extends in adjacent Should broadly understood between the surface of cell piece 31, tinsel S can extend between the surface of adjacent cell sheet 31, gold Belong to silk S can be connected with the secondary grid line 312 of cell piece 31, or tinsel S can also with adjacent cell sheet 31 in one The secondary grid line 312 of cell piece 31 is connected with the back side weld part 314 of another cell piece 31, or a part of tinsel S Being connected with the secondary grid line 312 of cell piece 31, remaining tinsel S is connected with the back side weld part 314 of cell piece 31 simultaneously.
In other words, tinsel S can extend between the front of adjacent cell sheet 31, it is also possible to extends in adjacent cell sheet 31 In a cell piece 31 front and the back side of another cell piece 31 between.Adjacent cell sheet is extended at tinsel S Time between front and the back side of another cell piece 31 of a cell piece 31 in 31, conductor wire 32 can include extending The front side conductive line 32A electrically connected on the front of cell piece 31 and with the secondary grid line 312 of cell piece 31, and extend in The back side conductor wire 32B, tinsel S electrically connected on the back side of cell piece 31 and with the back side weld part 314 of cell piece 31 Part between adjacent cell sheet 31 is properly termed as connecting conductor wire.
The all scopes disclosed in the application all comprise end points and can independently combine.Scope disclosed herein End points and any value are not limited to this accurate scope or value, these scopes or value should be understood to comprise close to these scopes or The value of value.
In this application, except as otherwise noted, directional terminology such as " upper and lower " typically refers to shown in the drawings upper and lower；" just Face " refer to solar module one side towards light in application process, namely sensitive surface；" back side " refers to solar energy Battery component 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 Figures 1 to 12, cell piece 31, front side conductive line are included according to the solar battery cell of the embodiment of the present application 32A and back side conductor wire 32B.
Specifically, cell piece 31 includes cell piece matrix 311, is spaced to turn up the soil and is located on cell piece matrix 311 front Secondary grid line 312, the back of the body electric field 313 being located on cell piece matrix 311 back side and being spaced turn up the soil and be located at back of the body electric field 313 On back side weld part 314, back side weld part 314 is by applying silver slurry or ashbury metal is formed on back of the body electric field 313.Front Conductor wire 32 is made up of tinsel S and electrically connects with front pair grid line 312A, back side conductor wire 32 be made up of tinsel S and Electrically connected with back of the body electric field 313 by back side weld part 314.
In other words, mainly it is made up of cell piece 31 and conductor wire 32 according to the solar battery cell of the application, cell piece 31 Then mainly it is made up of cell piece matrix 311 and secondary grid line 312, in this application, will be to be located at cell piece matrix 311 front Front pair grid line 312A as a example by be described in detail.
The front of cell piece matrix 311 is provided with multiple front pair grid line 312A, front side conductive line 32A being spaced apart from each other and arranging Being located at the front of cell piece matrix 311 and be positioned on the pair grid line 312A of front, front side conductive line 32A is made up of also tinsel S And electrically connect with front pair grid line 312A.
The back side of cell piece matrix 311 is provided with back of the body electric field 313, and back of the body electric field 313 forms the back side by applying silver slurry or ashbury metal Weld part 314, back side conductor wire 32B is located at the back side of cell piece matrix 311 and is positioned on back side weld part 314, the back side Conductor wire 32B is made up of tinsel S and electrically connects with back side weld part 314.
It should be noted that use three main grid structures in current main flow solar battery cell, its front and back is 3 Bullion slurry printing, the main gate line of sintering, the width of this main gate line is typically between 1.4-2mm.
In dereliction grid solar cell unit, the many one metal wires of general employing replace main gate line, and the secondary grid line in its front is general All remain, be used for connecting tinsel.After the silver-colored main gate line at its back side is replaced by tinsel, no longer retain.But metal Silk and the aluminium paste sinter layer at the back side, i.e. carry on the back the welding performance between electric field bad, in this application, if directly will be by tinsel The back side conductor wire 32B that S is constituted welds with back of the body electric field 313, the situation that welding performance is bad, impact welding the most easily occurs Effect.
Thus, according to the solar battery cell of the embodiment of the present application, by arranging back of the body electricity at the back side of cell piece matrix 311 Field 313 and the back side weld part 314 being located on back of the body electric field 313, back side conductor wire 32 and the back of the body starched by silver or ashbury metal is formed Face weld part 314 is weldingly connected, and can be greatly improved the switching performance of back side conductor wire 32 and back of the body electric field 313, it addition, this The solar battery cell production technology of application is simple, only need to design screen painting, and low cost.
An embodiment according to the application, ashbury metal comprises at least in Cu, Ag, Pb, Bi, Zn, In, Fe, Ni Plant and stannum.It is to say, ashbury metal is by least one combination in stannum and Cu, Ag, Pb, Bi, Zn, In, Fe, Ni Become.Thus, the back side weld layer 314 of this material is more preferable with back side conductor wire 32B welding performance.
Alternatively, it is multiple rows of that back side weld part 314 is arranged to be spaced apart from each other, and each row is along being orthogonal to back side conductor wire 32B Direction extend and each row in back side weld part 314 be spaced apart from each other.Thus, the back side weld part 313 of this structure can To reduce the consumption of raw material further, reduce cost.
Specifically, as it is shown in figure 1, with the front pair grid line 312 on cell piece matrix 311 along the above-below direction at accompanying drawing place As a example by extension, conductor wire 32 (including front side conductive line 32A and back side conductor wire 32B) extends the most in left-right direction.Accordingly Ground, as shown in Fig. 3 and Figure 13, back side weld part 314 is formed as multiple rows of structure of the most spaced apart setting, and Each row back side weld part 314 is all orthogonal with back side conductor wire 32B.
It is to say, in the example of the application, the structure of back side weld part 314 is class with the structure of front pair grid line 312A As it can be understood as the back side pair grid line of cell piece matrix 311.Back side weld part 314 only sets in the position needing welding Put slurry, be paved with without on whole cell piece matrix 311, the consumption of raw material can be greatly reduced, reduce cost.
In some detailed description of the invention of the application, back side weld part 314 is on the direction being parallel to back side conductor wire 32B Width more than the width of front pair grid line 312A.Preferably, the spacing between adjacent row back side weld part 314 is more than adjacent Spacing between the pair grid line 312A of front.
Specifically, back side weld part 314 is due to without the concern for Problem of Shading, thus can be disposed relative to front pair grid The structure that line 312A is wider, occupied area is bigger.And owing to the electric conductivity of back of the body electric field 313 is much better compared with front, the back side Distance between weld part 314 can relatively front pair grid line 312A bigger.
Preferably, back side weld part 314 has 5-30 row.Further, back side weld part 314 is being parallel to back side conduction Width on the direction of line 32B is 0.05-3mm.It is highly preferred that the width of back side weld part 314 is 0.2-1.5mm.
It is to say, back side weld part 314 is provided with 5-30 row in the lateral direction, each back side weld part 314 is in left and right The preferred 0.2-1.5mm of width on direction.Thus, on the basis of controlling cost, back side weld part 314 can be effectively ensured Welding performance with back side conductor wire 32B.
An embodiment according to the application, a part for back side weld part 314 is embedded in back of the body electric field 313.Preferably, Back side weld part 314 is than the back of the body high 0.003-0.03mm of electric field 313.Further, back side weld part 314 is than back of the body electric field 313 High 0.005-0.01mm.
In other words, the back side of cell piece matrix 311 is provided with back of the body electric field 313, the top of back side weld part 314 at least some of It is embedded in back of the body electric field 313, and the height of the aspect ratio back of the body electric field 313 that back side weld part 314 is in the vertical direction High 0.005-0.01mm.Thus, it is possible to improve the welding performance of back side weld part 314 and back side conductor wire 32B further.
Solaode chip arrays 30 according to the embodiment of the present application is described below.
Solaode chip arrays 30 according to the embodiment of the present application includes multiple solar battery cell, solar battery cell For according to the solar battery cell described in above-described embodiment, passing through metal between the cell piece 31 of adjacent solar battery unit Silk S-phase even, the surface of a tinsel S cell piece in adjacent cell sheet 31 and the surface of another cell piece 31 it Between reciprocation extension to constitute front side conductive line 32A and/or back side conductor wire 32B.
It is to say, adjacent two cell pieces 31 are connected by conductor wire 32, conductor wire 32 includes being positioned at cell piece 31 Upper surface on front side conductive line 32A and the back side conductor wire 32B that is positioned on the lower surface of cell piece 31, front side conductive line 32A and back side conductor wire 32B is constituted by tinsel S.
Owing to there is above-mentioned technique effect according to the solar battery cell of the above embodiments of the present application, therefore, according to the application The solaode chip arrays 30 of embodiment also has corresponding technique effect, i.e. can be effectively improved back side conductor wire 32B with The welding performance of back of the body electric field 313.
Specifically, in this application, tinsel S at the back side of the front of a cell piece 31 and another cell piece 31 it Between reciprocation extension, extend in tinsel S on cell piece 31 front and constitute front side conductive line 32A, extend in another Tinsel S on the back side of cell piece 31 constitutes back side conductor wire 32B.
Here, cell piece 31 constitutes battery with the conductor wire 32 being made up of the tinsel S extended on this cell piece 31 surface Sheet, in other words, is made up of multiple cell pieces according to the solaode chip arrays 30 of the embodiment of the present application, multiple cell pieces Conductor wire 32 is made up of reciprocation extension tinsel S on the surface of cell piece 31.
It is to be appreciated that in this application, term " reciprocation extension " is referred to as " coiling ", may refer to tinsel S extends along reciprocal stroke between the surface of cell piece 31.
In this application, " surface of a tinsel S cell piece 31 in adjacent cell sheet 31 and another cell piece 31 Surface between reciprocation extension " should broadly understood, such as, tinsel S can be with reciprocation extension in adjacent cell sheet 31 Between surface and the surface of another cell piece 31 of one cell piece 31, tinsel S can also be from first cell piece 31 Surface extend through the surface to last cell piece 31, intermediate cell sheet 31 surface of predetermined quantity, then from finally The surface of one cell piece 31 returns to and extends through the surface of the intermediate cell sheet 31 of described predetermined quantity to first battery The surface of sheet 31, so repeats.
Additionally, when cell piece 31 is by tinsel S parallel connection, tinsel S can with reciprocation extension on the front of cell piece, In the case, tinsel S constitutes the front side conductive line 32A of cell piece, and alternatively, tinsel S reciprocation extension is at battery On the front of sheet 31 and different tinsel S reciprocation extension is on the back side of cell piece 31, in the case, extend in electricity Tinsel S on pond sheet 31 front constitutes front side conductive line 32A, and the tinsel S at the back side extending in cell piece 31 is constituted Back side conductor wire 32B.
When cell piece 31 is one another in series by tinsel S, in adjacent cell sheet 31 one of tinsel S reciprocation extension Between front and the back side of another cell piece 31 of cell piece 31, in the case, tinsel S is at a cell piece 31 Front on extend part constitute front side conductive line 32A, tinsel S extend on the back side of another cell piece 31 adjacent Part constitute back side conductor wire 32B.In this application, unless expressly stated otherwise, conductor wire 32 can be understood as front Conductor wire 32A, back side conductor wire 32B, or front side conductive line 32A and back side conductor wire 32B.
Here, term " reciprocation extension " can be understood as tinsel S and extends " one is reciprocal " two conductor wires 32 of formation, Form U-shaped structure or v-shaped structure due to the reciprocal coiling of tinsel 321 between two conductor wires 32, but the application is not It is limited to this.
Cell piece array 30 according to the embodiment of the present application, the conductor wire 32 of multiple battery units is by the tinsel S of reciprocation extension Constitute, be connected, therefore, according to the solaode list of the embodiment of the present application by conductor wire 32 between adjacent cell sheet 31 Unit uses conductor wire 32 extracted current that tinsel is made, it is not necessary to uses expensive silver slurry to be printed as main gate line and draws electricity Stream, its cost is substantially reduced, and manufacturing process is simple, it is not necessary to use welding to connect cell piece, tinsel S and cell piece Secondary grid line 312 and back electrode easy to connect.
Additionally, due to conductor wire 32 is made up of the tinsel S of reciprocation extension, (i.e. tinsel is at electricity for the width of conductor wire 32 The width of the projection on the sheet of pond) it is far smaller than the width that existing printing silver starches the main gate line of formation, reduce shading-area, And, the quantity of conductor wire 32 can adjust easily, and compared with the main gate line that silver slurry is formed, the resistance of conductor wire 32 subtracts Little, improve photoelectric transformation efficiency.Owing to tinsel S reciprocation extension forms conductor wire, manufacture using cell piece array 30 During solar module 100, tinsel S is easier to accurately control, and is difficult to displacement, i.e. tinsel and " drift is less likely to occur Move ", do not interfere with photoelectric transformation efficiency, further increase photoelectric transformation efficiency.
Therefore, according to the solaode chip arrays 30 of the embodiment of the present application, low cost, photoelectric transformation efficiency are high.
Below with reference to the accompanying drawings solaode chip arrays 30 according to the application specific embodiment is described.
With reference to Fig. 1-3, the solaode chip arrays 30 according to one specific embodiment of the application is described.
In the embodiment shown in Fig. 1-3, it is shown that two battery units of solaode chip arrays 30, in other words, show Two cell pieces 31 that the conductor wire 32 by being made up of is connected with each other are gone out tinsel S.
It is understood that cell piece 31 includes cell piece matrix 311, secondary grid on the front that is located at cell piece matrix 311 Line 312 (i.e. front pair grid line 312A), the back of the body electric field 313 being located on the back side of cell piece matrix 311 and be located at back of the body electric field Back side weld part 314 on 313.In this application, it is to be understood that unless expressly stated otherwise, back side weld part 314 can be the back electrode of conventional batteries sheet, such as, formed by silver slurry printing, it is also possible to be analogous to cell piece front side of matrix On the back side pair grid line 312B of secondary grid line, it is also possible to for discrete multiple weld parts, in this application, unless otherwise clearly Illustrating, secondary grid line refers to the secondary grid line 312 on the front of cell piece matrix 311.
Specifically, in an embodiment of the application, tinsel is at the front of a cell piece 31 and another cell piece 31 The back side between reciprocation extension.
As Figure 1-3, in this embodiment, solaode chip arrays includes two cell piece 31A, and 31B is (in order to retouch State conveniently, the referred to herein as first cell piece 31A, the second cell piece 31B), tinsel S reciprocation extension is at the first cell piece 31A Front (sensitive surface, the upper surface in Fig. 2) and the back side of the second cell piece 31B between, thus, tinsel S constitute The back side conductor wire 32B, tinsel S of the front side conductive line 32A and the second cell piece 31B of the first cell piece 31A with The secondary grid line of the first cell piece 31A electrically connects (such as weld or bond with conducting resinl) and the back of the body electricity with the second cell piece 31B Pole electrically connects.
In an embodiment of the application, the back side of pond sheet matrix 311 is provided with back side weld part 314, and tinsel welds with the back side Meet portion 314 to be weldingly connected.
It is to say, in this embodiment, the front of cell piece matrix 311 is provided with front pair grid line 312A, this battery chip base The back side of body 311 is provided with back side weld part 314, when conductor wire 32 is positioned at the front of cell piece matrix 311, and conductor wire 32 It is weldingly connected with front pair grid line 312A, when conductor wire 32 is positioned at the back side of cell piece matrix 311, then with this cell piece The back side weld part 314 at matrix 311 back side is weldingly connected.
In certain embodiments, tinsel S is one, tinsel S the first cell piece 31A and the second cell piece 31B it Between reciprocation extension 10-60 time, it is preferable that as it is shown in figure 1, tinsel reciprocation extension 12 times is to form 24 conductor wires, And tinsel is single, in other words, single metal wire reciprocation extension forms 24 conductor wires, between adjacent conductive line 12 times Spacing can be 2.5 millimeters-15 millimeters.According to this embodiment, compared with the conductor wire of conventional batteries sheet, quantity increases, Thus reduce electric current from secondary grid line to the distance of conductor wire, decrease resistance, improve electricity conversion.In Fig. 1 institute In the embodiment shown, adjacent conductive line forms U-shaped structure, is thus easy to coiling wiry.Alternatively, the application is not Being limited to this, such as, adjacent conductive line can also form v-shaped structure.
In some embodiments it may be preferred that tinsel 321 is copper wire, but the application is not limited to this, such as tinsel 321 It can also be aluminium wire.Preferably, tinsel 321 has circular cross section, and thus, more sunlight can be irradiated to electricity On the sheet matrix of pond, improve photoelectric transformation efficiency further.
It is highly preferred that as shown in Figure 4, connecting material layer 322, such as conductive adhesive layer or welding it are coated with outside tinsel 321 Layer, tinsel weld, thus with secondary grid line and/or back electrode by the weld layer of cladding, it is simple to tinsel and pair grid line and/ Or the electrical connection of back electrode, it is to avoid in connection procedure, tinsel drifts about and affects photoelectric transformation efficiency.Certainly, tinsel and electricity The electrical connection of pond lamellar body can be carried out in the lamination process of solar module, it is also possible to carries out before being laminated, preferably Ground, is attached before being laminated.
In some embodiments it may be preferred that before tinsel contacts with cell piece, tinsel extends in a tensioned state, Will stretch by tinsel, after being connected with the secondary grid line and back electrode of cell piece, tensile force wiry can be discharged, by This is avoided the conductor wire drift when preparing solar module to affect photoelectric transformation efficiency further.
Fig. 5 shows the schematic diagram of the cell piece array of another embodiment according to the application.As it is shown in figure 5, tinsel is past Extending between the front of the first cell piece 31A and the front of the second cell piece 31B again, thus, tinsel is at the first battery The front of sheet 31A and the second cell piece 31B forms front side conductive line, in the case, the first cell piece 31A and second electricity Pond sheet 31B is connected in parallel to each other, it is, of course, understood that preferably, and the back electrode of the first cell piece 31A and the second battery The back electrode of sheet 31B can also be connected by the back side conductor wire that another tinsel reciprocation extension is formed, alternatively, and the first electricity The back electrode of pond sheet 31A and the back electrode of the second cell piece 31B can also be connected by the way of traditional.
Below with reference to Fig. 6, the solaode chip arrays 30 according to another embodiment of the application is described.
Solaode chip arrays 30 according to the embodiment of the present application includes n × m cell piece 31, in other words, multiple batteries Sheet 31 is arranged into the matrix form of n × m, and wherein n is columns, and m is row.More specifically, in this embodiment, 36 Individual cell 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, such as, row Number and columns can be unequal.For convenience, in figure 6, along direction from left to right, in same row's cell piece 31 Cell piece 31 be referred to as the first, second, third, fourth, the 5th and the 6th cell piece 31 successively, along side from the top down To, the row of cell piece 31 is referred to as the first, second, third, fourth, the 5th and the 6th row's cell piece 31 successively.
In same row's cell piece 31, tinsel reciprocation extension is at the surface of a cell piece 31 and another adjacent cell piece Between the surface of 31, in two adjacent row's cell pieces 31, a tinsel reciprocation extension cell piece 31 in a arranges Surface and a+1 row in a cell piece 31 surface between, and m-1 >=a >=1.
As shown in Figure 6, in concrete example, in same row's cell piece 31, tinsel reciprocation extension is at a cell piece Between the front of 31 with the back side of another adjacent cell piece 31, thus, the cell piece 31 in same row is one another in series. In two adjacent row's cell pieces 31, tinsel reciprocation extension is in the front of the cell piece 31 of the end being positioned at a row And between the back side of a cell piece 31 of the end of a+1 row, the most adjacent two row's cell pieces 31 are one another in series.
It is highly preferred that in adjacent two row's cell pieces 31, tinsel reciprocation extension is at the battery of the end being positioned at a row The surface of sheet 31 and between the surface of the cell piece 31 of an end of a+1 row, an end of a row and the One end of a+1 row is positioned at the same side of matrix, the most in figure 6, is positioned at the right side of matrix.
More specifically, in the embodiment shown in fig. 6, in the first row, one metal wire reciprocation extension first cell piece Between the back side between front and second cell piece 31 of 31, the front of second one metal wire reciprocation extension the second cell piece 31 And between the back side between the 3rd cell piece 31, the front of the 3rd one metal wire reciprocation extension the 3rd cell piece 31 and the 4th electricity Between the back side between pond sheet 31, the front of the 4th one metal wire reciprocation extension the 4th cell piece 31 and the 5th cell piece 31 it Between the back side between, the back side between front and the 6th cell piece 31 of the 5th one metal wire reciprocation extension the 5th cell piece 31 Between, thus, the adjacent cell sheet 31 in first row is one another in series by corresponding tinsel.
The front of the 6th cell piece 31 in six roots of sensation tinsel reciprocation extension first row and the 6th battery in adjacent second row Between the back side between sheet 31, thus, first row and second row are one another in series, in the 7th one metal wire reciprocation extension second row The front of the 6th cell piece 31 and second row between the back side between the 5th cell piece 31, the 8th one metal wire back and forth prolongs Stretch in the front of the 5th cell piece 31 in second row and second row between the back side between the 4th cell piece 31, by that analogy, Until the front of the second cell piece 31 in the 11st one metal wire reciprocation extension second row and the first cell piece 31 in second row Between the back side between, then, the front and the 3rd of the first cell piece 31 in the 12nd one metal wire reciprocation extension second row In row between the back side between the first cell piece 31, thus second row and the 3rd row are one another in series.Then, successively by the 3rd row Connecting 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 cell piece array 30 Standby, in this embodiment, set in the left side in the left side of the first cell piece 31 of first row and first cell piece 31 of the 6th row Putting busbar, a busbar connects the conductor wire extended from the left side of the first cell piece 31 of first row, another busbar Connect the conductor wire extended from the left side of first cell piece 31 of the 6th row.
As shown in the figure and above-mentioned, between the cell piece of the embodiment of the present application, it is connected by conductor wire series connection, first row, second Row, the 3rd row, the 4th row, conductor wire between the 5th row and the 6th row, is all used to realize series connection, as it can be seen, alternatively, Can also be in parallel for preventing the diode of spottiness between second row and the 3rd row, between the 4th row and the 5th row, two The connection of pole pipe can use the technology of well known to a person skilled in the art, such as busbar.
But, the application is not limited to this, such as, can connect between first row and second row, the 3rd row and the 4th row string Connection, the 5th row and the 6th row series connection, second row and the 3rd row are in parallel simultaneously, and the 4th row and the 5th row are in parallel, in the case, Can arrange in the left side of respective row or right side and be respectively provided with busbar.
Alternatively, the cell piece 31 in same row can be in parallel, such as, and the one metal wire the first cell piece from first row The front reciprocation extension of 31 front by the second to the 6th cell piece 31.
In some detailed description of the invention of the application, the adhesion between tinsel and cell piece 31 is 0.1-0.8 newton's In the range of.It is to say, the adhesion between conductor wire 32 and cell piece 31 is between 0.1-0.8 newton.Preferably, Adhesion between tinsel and cell piece 31 in the range of 0.2-0.6 newton, firm welding between cell piece and tinsel, Cell piece is difficult to sealing-off occur in operation and transfer process, is difficult to loose contact occur, and hydraulic performance decline, cost is the most simultaneously Low.
Preferably, reciprocation extension tinsel between the adjacent cell sheet 31 of same row is one, and reciprocation extension is adjacent Tinsel between the cell piece 31 of row is one.Thus, can realize adjacent by the repeatedly reciprocation extension of an one metal wire Connection between two cell pieces 31, preparation is simpler, and cost is lower.
In one embodiment of the application, tinsel is coated with weld layer, the thickness of weld layer and diameter ratio wiry For 0.02-0.5:1.
It is to say, in cell piece array 30, the thickness of weld layer and conductor wire 32 (include front side conductive line 32A and the back of the body Face 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 tinsel and cladding Weld layer in this wire surface.Weld layer can be coated with tinsel completely, it is also possible to part cladding tinsel.Work as weldering When connecing layer segment cladding tinsel, weld layer is preferably formed in the position that the secondary grid line 312 with cell piece 31 welds.Work as weldering Connecing layer when being coated with tinsel completely, weld layer can be coated on periphery wiry with ring-type form.The thickness of weld layer can To select in the larger context.Under preferable case, the thickness of weld layer is 1-100 micron, more preferably 1-30 micron.
The low-melting alloy forming weld layer can be the low-melting alloy of this area routine, and its fusing point can be 100-220 DEG C. Under preferable case, low-melting alloy contains Sn and is selected from least one in Bi, In, Ag, Sb, Pb and Zn, more excellent Choosing is containing Sn, Bi and is selected from least one in In, Ag, Sb, Pb and Zn.
Specifically, low-melting alloy can be Sn-Bi alloy, In-Sn alloy, Sn-Pb alloy, Sn-Bi-Pb alloy, At least one in Sn-Bi-Ag alloy, In-Sn-Cu alloy, Sn-Bi-Cu alloy and Sn-Bi-Zn alloy.Most preferably, Low-melting alloy is Bi-Sn-Pb alloy, and such as Sn content is that 40 weight %, Bi content are 55 weight % and Pb content is 5 The alloy (namely Sn40%-Bi55%-Pb5%) of weight %.The thickness of weld layer can be 0.001-0.06mm.Conductor wire 32 Cross-sectional area can be 0.01-0.5mm2.Tinsel can be tinsel commonly used in the art, such as copper wire.
Below with reference to Figure 10 and Figure 11, the solar module 100 according to the embodiment of the present application is described.
As shown in Figure 10 and Figure 11, upper cover plate 10, front are included according to the solar module 100 of the embodiment of the present application Adhesive film 20, above-mentioned cell piece array 30, back side adhesive film 40 and backboard 50.Upper cover plate 10, front adhesive film 20, Above-mentioned cell piece array 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 glued membrane Layer 20 and back side adhesive film 40 polyethylene octene elastomer (POE) and/or ethylene-vinyl acetate copolymer (EVA).? In the application, polyethylene octene elastomer (POE) and ethylene-vinyl acetate copolymer (EVA) can use this area normal Advise the product used or prepare according to method well known to those skilled in the art.
In embodiments herein, upper cover plate 10 and backboard 50 can carry out selecting and true according to this area conventional technique Fixed, it is preferable that upper cover plate 10 and backboard 50 can be each transparent sheet material, such as glass plate.
In the preparation process of solar module 100, can be first by secondary grid line and the back electrode of conductor wire and cell piece 31 Welding, is then laid out each layer and is laminated.
Other component parts of solar module 100 according to the application can be known in the art, the most superfluous at this State.
Concrete, solar module 100 includes upper cover plate 10, front adhesive film 20, cell piece array 30, back side glue Film layer 40 and backboard 50.Cell piece array 30 includes multiple cell piece 31, by many conductions between adjacent cell sheet 31 Line 32 is connected, and conductor wire 32 is formed by reciprocation extension tinsel S between the surface of adjacent cell sheet, conductor wire 32 and Secondary grid line welding, front adhesive film 20 directly contacts with conductor wire 32 and is filled between adjacent conductor wire 32.
In other words, according to the solar module 100 of the embodiment of the present application include being sequentially stacked along the vertical direction upper cover plate 10, Front adhesive film 20, cell piece array 30, back side adhesive film 40 and backboard 50, cell piece array 30 includes multiple battery Sheet 31 and many conductor wires 32 of the multiple cell pieces 31 of connection, conductor wire 32 is made up of tinsel S, and tinsel S is reciprocal Extend on the surface of adjacent two cell piece 31.
Conductor wire 32 electrically connects with cell piece 31, wherein, and front adhesive film 20 and the conductor wire 32 being positioned on cell piece 31 Directly contacting and be filled between adjacent conductor wire 32, front adhesive film 20 both can play the work of fixing conductor wire 32 With, by conductor wire 32 and outside air and steam isolation, thus conductor wire 32 can be avoided oxidized again, it is ensured that photoelectricity Conversion efficiency.
Thus, according to the solar module 100 of the embodiment of the present application, by leading of being made up of the tinsel S of reciprocation extension The main gate line of electric wire 32 replacement conventional batteries sheet and welding, reduce cost；The tinsel S of reciprocation extension decreases tinsel The number of the free end of S, when arranging tinsel S, requisite space is little, is not limited by a space, by tinsel S reciprocation extension structure The radical of the conductor wire 32 become can be greatly improved, and preparation is simple, it is possible to batch production；Front adhesive film 20 and conductor wire 32 directly contact and are filled between adjacent conductor wire 32, can be effectively by conductor wire 32 and outside air, steam etc. Isolation, it is to avoid the oxidation of conductor wire 32, can be effectively ensured electricity conversion.
In some detailed description of the invention of the application, a tinsel S cell piece 31 in adjacent cell sheet 31 is just Reciprocation extension between the back side of face and another cell piece 31, front adhesive film 20 and leading on the front of a cell piece 31 Electric wire 32 directly contacts and is filled between the adjacent conductive line 32 on the front of a cell piece 31, back side adhesive film 40 The adjacent of the back side directly contacting and being filled in another cell piece 31 with the conductor wire 32 at the back side of another cell piece 31 is led Between electric wire 32.
It is to say, in this application, adjacent two cell pieces 31 are connected by tinsel S-phase, and at adjacent two In cell piece 31, the front of a cell piece 31 connects with tinsel S-phase, the back side of another cell piece 31 and tinsel S It is connected.
Wherein, the front adhesive film 20 on front and tinsel S-phase cell piece 31 even and the metal in this cell piece 31 front Silk S directly contacts and is filled between adjacent conductor wire 32, the back side of the back side and tinsel S-phase cell piece 31 even Adhesive film 40 directly contacts with the tinsel S at this cell piece 31 back side and is filled between adjacent conductor wire 32 (such as figure Shown in 2).
Thus, according to the solar module 100 of the embodiment of the present application, not only front adhesive film 20 can be by part electricity The conductor wire 32 in the front of pond sheet 31 separates with the external world, and back side adhesive film 40 can also be by the back side of percentage of batteries sheet 31 Conductor wire 32 separates with the external world, may further ensure that the photoelectric transformation efficiency of solar module 100.
In some detailed description of the invention of the application, the size for conventional cell piece is 156mm × 156mm；Solar energy The series resistance of battery component is 380-440 milliohm/60 slice, and the application is not limited to 60 simultaneously, can be 30, 72 etc., when for 72, the series resistance of solar module is 456-528 milliohm, the excellent electrical property of battery.
In some detailed description of the invention of the application, the size for conventional cell piece is 156mm × 156mm；Solar energy The open-circuit voltage of battery component is 37.5-38.5V/60 sheet, and same the application is not limited to 60, can be 30,72 Sheet etc..Short circuit current is 8.9-9.4A, and short circuit current is unrelated with the number of cell piece.
In some detailed description of the invention of the application, the fill factor, curve factor of solar module is 0.79-0.82, and it is not by electricity The size of pond sheet and the impact of number, it affects the electrical property of battery.
In some detailed description of the invention of the application, the size for conventional cell piece is 156mm × 156mm；Solar energy The running voltage of battery component is 31.5-32V/60 sheet, and same the application is not limited to 60, can be 30,72 Sheet etc..Operating current is 8.4-8.6A, and operating current is unrelated with the number of cell piece.
In some detailed description of the invention of the application, the size for conventional cell piece is 156mm × 156mm；Solar energy The conversion efficiency of battery component is 16.5-17.4%.Power is 265-280W/60 sheet.
The preparation method of the solar module 100 according to the embodiment of the present application is described below with reference to Fig. 7-9.
Specifically, comprise the following steps according to the preparation method of the solar module of the embodiment of the present application:
Thering is provided cell piece 31, cell piece 31 includes cell piece matrix 311, is spaced to turn up the soil and is just being located at cell piece matrix 311 Secondary grid line 312, the back of the body electric field 313 being located on cell piece matrix 311 back side on face and be spaced to turn up the soil and be located at back of the body electric field Back side weld part 314 on 313, back side weld part 314 is formed by applying silver slurry or ashbury metal on back of the body electric field 313.
The back side conductor wire front side conductive line 32 being made up of tinsel being connected with front pair grid line 312 and tinsel is constituted 32 are connected, to obtain solar battery cell with back of the body electric field 313 by back side weld part 314.
Upper cover plate 10, front adhesive film 20, cell piece array 30, back side adhesive film 40 and backboard 50 are sequentially stacked, and Make back side adhesive film 40 faced by the back side of front adhesive film 20, cell piece 31 faced by the front of cell piece 31, then carry out layer Pressure obtains solar module 100.
The preparation method of the solar module 100 according to the embodiment of the present application includes first preparing above-mentioned cell piece array 30, then it is sequentially stacked upper cover plate 10, front adhesive film 20, cell piece array 30, back side adhesive film 40 and backboard 50, Finally carry out lamination and obtain solar module 100.It is understood that the preparation of solar module 100 is also wrapped Include other steps, such as with the space between sealant sealing upper cover plate 10 and backboard 50, and utilize U-frame by above-mentioned Element tightens together, and this it is known to those skilled in the art that, is not detailed herein.
The preparation of solaode chip arrays 30 includes tinsel reciprocation extension between the surface of cell piece 31 and with described The surface of cell piece 31 is electrically connected to form many conductor wires, and the most adjacent cell piece 31 is by described many conductor wires even Connect and form cell piece array 30.
Wherein, the back side of cell piece matrix 311 is provided with back of the body electric field 313, by applying silver slurry or ashbury metal (example on back of the body electric field 313 As, silver slurry or ashbury metal can be applied by silk-screen printing technique) form back side weld part 314, back side conductor wire 32B sets At the back side of cell piece matrix 311 and be positioned on back side weld part 314, back side conductor wire 32B be made up of tinsel S and Electrically connect with back side weld part 314.Specifically, as it is shown in fig. 7, in a tensioned state, by tinsel reciprocation extension 12 times. Then, as shown in Figure 8, the first cell piece 31 and the second battery body is prepared.It follows that as it is shown in figure 9, by the first electricity The front of pond sheet 31 is connected with tinsel and is connected with tinsel at the back side of the second cell piece 31, is consequently formed cell piece battle array Row 30, show two cell pieces 31 in Fig. 9, as it has been described above, when cell piece array 30 has multiple cell piece 31, The back side in the front of one cell piece 31 with another adjacent cell piece 31 is connected, i.e. by the tinsel utilizing reciprocation extension The secondary grid line of one cell piece 31 is connected with the back electrode tinsel of another cell piece 31.Tinsel is by position respectively Reciprocation extension under two clip tensionings of these two ends of root silk, this tinsel has only to two clips can realize coiling, Greatly reduce the consumption of clip, save assembly space.
In the embodiment shown in fig. 9, adjacent cell sheet is one another in series, as it has been described above, as required, adjacent cell sheet can To be connected in parallel to each other by tinsel.
By the cell piece array 30 prepared and upper cover plate 10, front adhesive film 20, back side adhesive film 40 and backboard 50 Be sequentially stacked, and make the front of described cell piece 31 in the face of described front adhesive film 20, described cell piece 31 the back side faced by Back side adhesive film 40, then carries out lamination and obtains solar module 100.It is understood that tinsel and cell piece The connection of 31 can be carried out in lamination process, it is of course also possible to first connect, is laminated afterwards.
Front adhesive film 20 directly contacts placement with conductor wire 32, and when lamination, front adhesive film 20 is melted fills conductor wire 32 Between gap.Back side adhesive film 40 directly contacts placement with conductor wire 32, and when lamination, back side adhesive film 40 is melted fills Gap between conductor wire 32.
Example 1
Example 1 is for the example of the solar module 100 that the application is described and preparation method thereof.
(1) tinsel S is prepared
The surface of copper wire is adhered to one layer of Sn40%-Bi55%-Pb5% alloy-layer (fusing point is 125 DEG C), wherein, the horizontal stroke of copper wire Sectional area is 0.04mm2, the thickness of alloy-layer is 16 microns, thus prepares tinsel S.
(2) solar module 100 is prepared
The POE adhesive film (melt temperature is 65 DEG C) of a size of 1630 × 980 × 0.5mm is provided, and size is correspondingly provided It is the glass plate of 1633 × 985 × 3mm and polycrystalline silicon battery plate 31 that 60 chip sizes are 156 × 156 × 0.21mm.Battery Sheet 31 has 91 secondary grid lines (material is silver, and width is 60 microns, and thickness is 9 microns), and every secondary grid line is substantially Running through the distance between cell piece 31, and adjacent pair grid line in the vertical is 1.7mm, and the back side of cell piece 31 has 5 companies Continuous back side weld part, back side weld part is formed by applying silver slurry on back of the body electric field, and every back side weld part is substantially vertical The distance extended upward through between cell piece 31, and adjacent two back side weld parts is 31mm.
60 cell pieces 31 are arranged with a matrix type (6 rows 10 arrange), two cell pieces 31 adjacent in same row Between, make 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 Extending, tinsel is by laying respectively at reciprocation extension under two clip tensionings of these two ends of root silk, thus forms 15 and put down The conductor wire of row, and the secondary grid line of a cell piece 31 is welded with conductor wire, the back side of another cell piece 31 is welded Portion welds with conductor wire, and welding temperature is 160 DEG C, and the distance between the adjacent conductive line being parallel to each other is 9.9mm.Thus By in a row for 10 cell piece series connection, this kind of battery strings of 6 row is connected into array by busbar.
Then, by upper glass plates, upper POE adhesive film, in the matrix form arrangement and with multiple cell pieces of welded wire, Lower POE adhesive film and lower glass plate stack the most successively, wherein, make the sensitive surface of cell piece 31 in the face of front adhesive film 20, front adhesive film 20 directly contacts with conductor wire 32, makes back side adhesive film 40 faced by the back side of cell piece 31, then Putting in laminating machine and be laminated, front adhesive film 20 is filled between adjacent conductor wire 32, thus prepares solar-electricity Pond assembly A1.
Comparative examples 1
Comparative examples 1 is with the difference of example 1:
The back side of cell piece is not provided with weld part, i.e. back side conductor wire directly welds with back of the body electric field, thus prepares solar-electricity Pond assembly D1.
Example 2
Example 2 is for the example of the solar module that the application is described and preparation method thereof.
(1) tinsel S is prepared
The surface of copper wire is adhered to one layer of Sn40%-Bi55%-Pb5% alloy-layer (fusing point is about 125 DEG C), wherein, copper wire Cross-sectional area is 0.03mm2, the thickness of alloy-layer is 10 microns, thus prepares tinsel S.
(2) solar module is prepared
There is provided the EVA adhesive film layer (melt temperature is 60 DEG C) of a size of 1630 × 980 × 0.5mm, it is provided that a size of The glass plate of 1633 × 985 × 3mm and the polycrystalline silicon battery plate 31 that 60 chip sizes are 156 × 156 × 0.21mm.Cell piece The sensitive surface of 31 is provided with 91 secondary grid lines (material is silver, and width is 60 microns, and thickness is 9 microns), every secondary grid The distance that line runs through between cell piece 31, and adjacent two secondary grid lines the most in the vertical is 1.7mm, the back of the body of cell piece 31 Face is provided with 5 discrete back side weld parts, and every back side weld part is made up of 20 weld parts being spaced apart from each other, the back of the body Face weld part is formed by applying ashbury metal on back of the body electric field, and every back side weld part runs through battery the most in the vertical Distance between sheet 31, and adjacent two back side weld parts is 31mm.
60 cell pieces 31 are arranged with a matrix type (6 rows 10 arrange), two cell pieces 31 adjacent in same row Between, make 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, thus form 20 parallel conductor wires, and the secondary grid line of a cell piece 31 is welded with conductor wire, by another The back side weld part of individual cell piece 31 welds with 20 conductor wires respectively, and the distance between the adjacent conductive line being parallel to each other For 7mm.Then, by upper glass plates, upper POE adhesive film, in the matrix form arrangement and the multiple batteries with welded wire Sheet, lower POE adhesive film and lower glass plate stack the most successively, wherein, make the sensitive surface of cell piece 31 in the face of front glue Film layer, makes the back side of cell piece 31 in the face of back side adhesive film, is subsequently placed in laminating machine and is laminated, thus prepare solar energy Battery component A2.
Example 3
Method according to example 3 prepares solar module, and the difference with example 1 is: the back side of cell piece arranges 20 Bar back side weld part.Thus prepare solar module A3.
Performance test:
(1) the solder bond power test between back side weld part and tinsel:
Welding between tinsel with cell piece back side weld part in test solar module A1-A3 and D1 by the following method Adhesion:
1, cell piece being horizontally placed on the test position of tension tester, will place briquetting on cell piece, briquetting is placed in metal The both sides of silk so that during test, cell piece is not pulled up；
2, tinsel is clipped on the draw ring of strain gauge, direction of pull and cell piece angle at 45 °；
3, start strain gauge, make strain gauge the most upwards uniform motion, by tinsel from the pull-up of the cell piece back side, note The pulling force data that records of strain gauge when record tinsel departs from, takes its average and is between this wiry and secondary grid line of cell piece Solder bond force data.
(2) photoelectric transformation efficiency test:
The solar-electricity according to method employing single flash operation simulator disclosed in IEC904-1 prepared by above-mentioned example and comparative examples Pond assembly is tested, test condition be standard test condition (STC): light intensity be 1000W/m2；Spectrum is AM1.5；Temperature Degree is 25 DEG C, records the photoelectric transformation efficiency of each cell piece.
Result is as shown in table 1 below.
Table 1
Solar module A1 D1 A2 A3
Solder bond power/N 0.4 0.1 0.36 0.49
Photoelectric transformation efficiency (%) 16.8 15.3 16.9 17.2
By the result of table 1 it can be seen that the solar module of the embodiment of the present application, tinsel welds with back side weld part Adhesion is high, i.e. tinsel is high with the back side weld strength of cell piece, and can obtain of a relatively high opto-electronic conversion effect Rate.
In describing the invention, it is to be understood that term " " center ", " longitudinally ", " laterally ", " length ", " width ", " thickness ", " on ", D score, "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", Orientation or the position relationship of the instruction such as " outward ", " clockwise ", " counterclockwise " are based on orientation shown in the drawings or position relationship, It is for only for ease of the description present invention and simplifies description rather than instruction or imply that the device of indication or element must have specific Orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.
Additionally, term " first ", " second " are only used for describing purpose, and it is not intended that instruction or hint relative importance Or the implicit quantity indicating indicated technical characteristic.Thus, define " first ", the feature of " second " can be expressed Or implicitly include one or more this feature.In describing the invention, " multiple " are meant that two or two Above, unless otherwise expressly limited specifically.
In the present invention, unless otherwise clearly defined and limited, term " install ", " being connected ", " connection ", " fixing " Should be interpreted broadly Deng term, connect for example, it may be fixing, it is also possible to be to removably connect, or be integrally connected；Can To be mechanical connection, it is also possible to be electrical connection；Can be to be joined directly together, it is also possible to be indirectly connected to by intermediary, permissible It it is the connection of two element internals.For the ordinary skill in the art, above-mentioned art can be understood as the case may be Language concrete meaning in the present invention.
In the present invention, unless otherwise clearly defined and limited, fisrt feature second feature it " on " or D score Can include that the first and second features directly contact, it is also possible to include that the first and second features are not directly contact but logical Cross the other characterisation contact between them.And, fisrt feature second feature " on ", " top " and " on Face " include that fisrt feature directly over second feature and oblique upper, or is merely representative of fisrt feature level height higher than the Two features.Fisrt feature second feature " under ", " lower section " and " below " include that fisrt feature is special second Directly over levying and oblique upper, or it is merely representative of fisrt feature level height less than second feature.
In the description of this specification, reference term " embodiment ", " some embodiments ", " example ", " concrete example ", Or specific features, structure, material or the feature that the description of " some examples " etc. means to combine this embodiment or example describes It is contained at least one embodiment or the example of the present invention.In this manual, the schematic representation of above-mentioned term is differed Surely identical embodiment or example are referred to.And, the specific features of description, structure, material or feature can be any One or more embodiments or example in combine in an appropriate manner.
Although above it has been shown and described that embodiments of the invention, it is to be understood that above-described embodiment is exemplary, Being not considered as limiting the invention, those of ordinary skill in the art is without departing from the principle of the present invention and the situation of objective Under above-described embodiment can be changed within the scope of the invention, revise, replace and modification.

Claims (28)

1. a solar battery cell, it is characterised in that including:
Cell piece, described cell piece includes cell piece matrix, is spaced the pair being located on described cell piece front side of matrix of turning up the soil Grid line, the back of the body electric field and being spaced being located on the described cell piece matrix back side are turned up the soil the back side welding being located on described back of the body electric field Portion, described back side weld part is formed by applying silver slurry or ashbury metal on described back of the body electric field；
Front side conductive line, described front side conductive line is made up of tinsel and electrically connects with described front pair grid line；
Back side conductor wire, described back side conductor wire is made up of tinsel and is electrically connected with described back of the body electric field by back side weld part.
Solar battery cell the most according to claim 1, it is characterised in that described ashbury metal comprise Cu, Ag, Pb, At least one in Bi, Zn, In, Fe, Ni and stannum.
Solar battery cell the most according to claim 1 and 2, it is characterised in that described back side weld part is arranged to Be spaced apart from each other is multiple rows of, each row along be orthogonal to described back side conductor wire direction extend and each row in back side weld part It is spaced apart from each other.
Solar battery cell the most according to claim 3, it is characterised in that described back side weld part is being parallel to State the width more than described front pair grid line of the width on the direction of back side conductor wire.
Solar battery cell the most according to claim 3, it is characterised in that between described adjacent two row's weld parts Spacing is more than the spacing between adjacent pair grid line.
Solar battery cell the most according to claim 3, it is characterised in that described row arranges for 5-30.
7. according to the solar battery cell according to any one of claim 1-11, it is characterised in that the described back side is welded Portion's width on the direction being parallel to described back side conductor wire is 0.05-3mm.
Solar battery cell the most according to claim 7, it is characterised in that the width of described back side weld part is 0.2-1.5mm。
9. according to the solar battery cell according to any one of claim 1-8, it is characterised in that described back side weld part A part be embedded in described back of the body electric field.
10. according to the solar battery cell according to any one of claim 1-9, it is characterised in that the described back side is welded Portion is than the described high 0.003-0.03mm of back of the body electric field.
11. solar battery cells according to claim 10, it is characterised in that described back side weld part is than the described back of the body Electric field height 0.005-0.01mm.
12. 1 kinds of solaode chip arrays, it is characterised in that described cell piece array includes multiple battery unit, described Battery unit is according to the solar battery cell according to any one of claim 1-11, passes through metal between adjacent cell sheet Silk is connected, reciprocal between surface and the surface of another cell piece of a described tinsel cell piece in adjacent cell sheet Extend to constitute described front side conductive line and/or described back side conductor wire.
13. solaode chip arrays according to claim 12, it is characterised in that described tinsel is in one Reciprocation extension between front and the back side of another cell piece described of cell piece, extends on one cell piece front Tinsel constitutes described front side conductive line, and the described back side of tinsel composition extended on the back side of another cell piece described is led Electric wire.
14. solaode chip arrays according to claim 13, it is characterised in that described tinsel is in one Reciprocation extension 10-60 time between front and the back side of another cell piece described of cell piece.
15. solaode chip arrays according to claim 13, it is characterised in that between adjacent front surfaces conductor wire Spacing is 2.5-15mm.
16. solaode chip arrays according to claim 13, it is characterised in that adjacent front surfaces conductor wire forms U Shape or v-shaped structure.
17. solaode chip arrays according to claim 12, it is characterised in that described cell piece is arranged into n × m Matrix form, wherein n is columns, and m is row,
In same row's cell piece, described tinsel reciprocation extension is at the surface of a cell piece and another adjacent cell piece Between surface, in two adjacent row's cell pieces, the surface of a described tinsel reciprocation extension cell piece in a arranges And between the surface of a cell piece in a+1 row, and m-1 >=a >=1.
18. solaode chip arrays according to claim 17, it is characterised in that in adjacent two row's cell pieces, Described tinsel reciprocation extension is in the surface of the cell piece of the end being positioned at a row and the end being positioned at a+1 row Cell piece surface between, an end of an end and the described a+1 row of described a row is positioned at described matrix The same side.
19. solaode chip arrays according to claim 18, it is characterised in that in same row's cell piece, institute State tinsel reciprocation extension between the front of a cell piece with the back side of another adjacent cell piece,
In two adjacent row's cell pieces, described tinsel reciprocation extension is just being positioned at the cell piece of the end that a arranges Face and a+1 row end a cell piece the back side between, with adjacent two row's cell pieces of connecting.
20. according to the solaode chip arrays according to any one of claim 17-19, it is characterised in that reciprocation extension Tinsel between the adjacent cell sheet of same row is one, and the tinsel that reciprocation extension is between the cell piece of adjacent row It it is one.
21. according to the solaode chip arrays according to any one of claim 17-20, it is characterised in that described metal Being coated with weld layer on Si, the thickness of described weld layer and described diameter ratio wiry are 0.02-0.5:1.
22. solaode chip arrays according to claim 21, it is characterised in that described weld layer contain Sn with And at least one in Bi, In, Ag, Sb, Pb and Zn.
23. solaode chip arrays according to claim 21, it is characterised in that described weld layer contains Sn, Bi And at least one in In, Ag, Sb, Pb and Zn.
24. solaode chip arrays according to claim 17, it is characterised in that described tinsel is copper wire.
25. 1 kinds of solar modules, it is characterised in that the upper cover plate that includes being sequentially stacked, front adhesive film, battery Chip arrays, back side adhesive film and backboard, described cell piece array is the solar-electricity according to any one of claim 12-24 Pond chip arrays.
The preparation method of 26. 1 kinds of solar modules, it is characterised in that including:
Thering is provided cell piece, described cell piece includes cell piece matrix, is spaced to turn up the soil and is located on described cell piece front side of matrix Secondary grid line, the back of the body electric field and be spaced the back side being located on described back of the body electric field of turning up the soil that is located on the described cell piece matrix back side Weld part, described back side weld part is formed by applying silver slurry or ashbury metal on described back of the body electric field；
The back side conductor wire being connected with described front pair grid line by the front side conductive line being made up of tinsel and constituted by tinsel leads to Cross described back side weld part to be connected with described back of the body electric field, to obtain solar battery cell；
Upper cover plate, front adhesive film, described solar battery cell, back side adhesive film and backboard are stacked successively, and makes institute State front adhesive film faced by the front of solar battery cell, make back side adhesive film faced by the back side of described solar battery cell, Then carry out lamination and obtain described solar module.
The preparation method of 27. solar modules according to claim 26, it is characterised in that described cell piece is Multiple, it is connected by described conductor wire between adjacent cell sheet and forms cell piece battle array according to any one of claim 12-24 Row.
The preparation method of 28. solar modules according to claim 26, it is characterised in that described tinsel exists Reciprocation extension in any one in the front and back of described 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
US14/738,677 US10381493B2 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
US14/738,322 US20160126372A1 (en) 2014-10-31 2015-06-12 Solar cell array, solar cell module and manufacturing method thereof
US14/738,578 US10069019B2 (en) 2014-10-31 2015-06-12 Solar cell unit, solar cell array, solar cell module and manufacturing method thereof
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US14/738,409 US10529868B2 (en) 2014-10-31 2015-06-12 Solar cell array, solar cell module and manufacturing method thereof
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