CN204088341U - Without main grid high efficiency back contact solar cell backboard and assembly - Google Patents
Without main grid high efficiency back contact solar cell backboard and assembly Download PDFInfo
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- CN204088341U CN204088341U CN201420565021.3U CN201420565021U CN204088341U CN 204088341 U CN204088341 U CN 204088341U CN 201420565021 U CN201420565021 U CN 201420565021U CN 204088341 U CN204088341 U CN 204088341U
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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
Abstract
The utility model relates to area of solar cell, particularly without main grid, high efficiency back contact solar cell backboard and assembly.It is characterized in that: be describedly followed successively by electric connection layer and basic unit from top to bottom without main grid high efficiency back contact solar cell backboard, described electric connection layer is connected by bonding agent with between basic unit; Described electric connection layer comprises through hole, conductor wire, described conductor wire is arranged at the front and back of electric connection layer respectively, back side conductor wire is connected to front by the conducting medium in described through hole, and described electric connection layer is for connecting back contact battery sheet, and described electric connection layer is insulating material; The Thickness Ratio of described electric connection layer and described basic unit is 1: 1 ~ 1: 60.Its beneficial effect is, provides a kind of and effectively can prevent P emitter and the short circuit of N emitter, low cost, resistance toly hiddenly to split, solar module, assembly and preparation method thereof that high efficiency, stability are high.
Description
Technical field
The utility model relates to area of solar cell, particularly without main grid high efficiency back contact solar cell backboard and assembly.
Background technology
The energy is the material base of mankind's activity, along with development and the progress of human society, grows with each passing day to the demand of the energy.Traditional fossil energy belongs to the demand that non-renewable energy resources have been difficult to continue to meet social development, and therefore world community is in recent years to the research of new forms of energy and renewable origin with utilize increasingly burning hot.Wherein solar energy generation technology has and sunlight is converted into electric power, uses the advantage such as simple, environment friendly and pollution-free, energy utilization rate is high especially to receive widespread attention.Solar power generation uses large-area P-N junction diode in sunlit situation, produce photo-generated carrier generating.
In prior art, occupy an leading position and the crystal-silicon solar cell of large-scale commercial, its emitter region and emitter region electrode are all positioned at battery front side (phototropic face), and namely main grid, auxiliary grid line are all positioned at battery front side.Because solar energy level silicon material electronics diffusion length is shorter, emitter region is positioned at the collection efficiency that battery front side is conducive to improving charge carrier.But the grid line due to battery front side blocks part sunlight (being about 8%), thus the effective area of shining light of solar cell is made to reduce and have lost one part of current therefrom.In addition when cell piece is connected, need the back side of receiving another block battery with tin-coated copper strip from the face bonding of one piece of battery, if use thicker tin-coated copper strip can be too hard and cause the cracked of cell piece, if but too much light can be covered again with carefully wide tin-coated copper strip due to it.Therefore, use which kind of zinc-plated welding all can produce energy loss that series resistance brings and optical loss, is unfavorable for the sheet of cell piece simultaneously.In order to solve the problems of the technologies described above, front electrode is transferred to cell backside by those skilled in the art, develops back contact solar cell, and back contacts solar cell refers to that the emitter region electrode of battery and base electrode are all positioned at a kind of solar cell of cell backside.Back contact battery has many good qualities: 1. efficiency is high, owing to completely eliminating the shading loss of front gate line electrode, thus improves battery efficiency.2. can realize the sheet of battery, the metal connector device that series connection uses is all at cell backside, and the connection do not existed from front to the back side can use thinner silicon chip, thus reduce costs.3. more attractive in appearance, the front color of battery is even, meets the esthetic requirement of consumer.
Back contacts solar cell comprises the various structures such as MWT, EWT and IBC.The key that back contacts solar cell large-scale commercial is produced is the series connection of back contacts solar cell being got up and be made into solar components of how high efficiency, low cost.The common preparation method of MWT assembly uses composite conducting backboard, conductive backings applies conducting resinl, position punching corresponding on top of the encapsulation material makes conducting resinl run through encapsulating material, being positioned over exactly by back contacts solar cell on encapsulating material makes the conductiving point in conductive backings be contacted by conducting resinl with the electrode on back contacts solar cell, then on cell piece, lay upper strata EVA and glass, more whole stacked good module upset is entered laminating machine carry out lamination.There is following defect in this technique: the composite conducting backboard 1, used is composite conducting metal forming in backboard, is generally Copper Foil, and need to carry out laser ablation or chemical etching to Copper Foil.Because laser ablation still can operate for simple graph, for complex pattern, then etching speed is slow, production efficiency is low, and chemical etching then exists needs previously prepared complex-shaped and corrosion resistant mask, environmental pollution and corrosive liquid to the etching problem of polymer base material.The conductivity type backplane manufacturing process manufactured in this way is complicated, and cost is high.2, need to carry out punching to make conducting resinl run through encapsulating material to the encapsulating material of layer after solar cell piece, due to encapsulating material normally viscoelastic body, it is very big to carry out accurate punching difficulty.3, need accurate spot gluing equipment by the relevant position of conductive glue at backboard, the battery less to this back contacts of MWT point can also operate, and uses spot gluing equipment cannot realize to back contact battery that back contacts point area is little, quantity is large such as IBC at all.
P-N junction is positioned over cell backside by IBC technology, and the distance simultaneously additionally reducing electron collection is blocked without any in front, therefore can increase substantially cell piece efficiency.IBC battery uses shallow diffusion, light dope and SiO in front
2the technology such as passivation layer reduce recombination losses, and at cell backside, diffusion region is limited in less region, these diffusion regions become lattice arrangement at cell backside, and diffusion region Metal Contact is limited in the fine contact point being rendered as One's name is legion in very little scope.IBC battery decreases the area of the heavy diffusion region of cell backside, and the saturation current of doped region can significantly reduce, and open circuit voltage and conversion efficiency are improved.By the little contact point collected current of One's name is legion, electric current is shortened in the transmission range of back surface simultaneously, significantly reduce the series resistance of assembly.
IBC back contact battery enjoys industry to pay close attention to owing to having the unapproachable high efficiency of conventional solar cell, has become the study hotspot of solar battery technology of new generation.But IBC solar module P-N junction position is adjacent comparatively near and all at the cell piece back side, be difficult to connect to IBC battery module and be prepared into assembly in prior art.For solving the problem, also there is the multiple improvement to IBC back contact solar cell in prior art, Sunpower company once invented and adjacent P or N emitter was guided to battery edge by the connected electric current the most at last of the thin grid line of silver slurry silk screen printing, re-use connecting band at the solder joint that the printing of cell piece edge is larger and carry out welding series connection, when after screen printing technique invention, and field of solar energy uses screen printing technique to form confluxing of electric current at present always, as the patent 201310260260.8 of up-to-date application, 201310606634.7, 201410038687.8, 201410115631.8, do not make any improvement.
But, thin grid line is used to carry out electric current collection, 5 cun of cell pieces still can use, but generally popular in the prior art 6 cun or larger silicon chip will run into series resistance and rise and degradation problem under fill factor, curve factor, cause manufactured component power seriously to reduce.IBC battery in the prior art also can reduce series resistance by silk screen printing is wider between adjacent P or N emitter silver slurry grid line, but the increase due to silver consuming amount can bring the sharply rising of cost, the insulation effect that wide grid line also can produce between P-N is simultaneously deteriorated, the problem of easily electric leakage.
Patent US20110041908A1 discloses back contact solar battery and the production method thereof that a kind of back side has elongated interdigital emitter region and base region, there is Semiconductor substrate, the backside surface of Semiconductor substrate is provided with elongated base region and elongated emitter region, base region is base semiconductor type, and emitter region is provided with the emitter semiconductor type contrary with described base semiconductor type; Elongated emitter region is provided with the elongated emitter electrode for electrical contact emitter region, and elongated base region is provided with the elongated base electrode for electrical contact base region; Wherein elongated emitter region has the structure width less than elongated emitter electrode, and wherein elongated base region has the structure width less than described elongated base electrode.But need and arrange the next effective collected current of a large amount of electric-conductors, therefore cause manufacturing cost to increase, processing step is complicated.
Patent EP2709162A1 discloses a kind of solar cell, applies to back contact solar cell, discloses and is separated from each other and the electrode contact unit be alternately arranged, and by the connector connecting electrode osculating element of longitudinal direction, forms " work " shape electrode structure; But this kind of structure has carried out twice connection on cell piece, that cell piece is connected with electrode contact unit for the first time, then also need by connector connecting electrode osculating element, and " work " shape electrode intersects mutually, twice connection brings technologic complexity, and cause too much electrode contact point, may cause " disconnection " or " even wrong ", be unfavorable for the overall performance of back contact solar cell.
Patent WO2011143341A2 discloses a kind of back contact solar cell, comprise substrate, multiple adjacent P doped layer and N doped layer are positioned at substrate back, P doped layer and N doped layer and metal contact layer stacked, and P doped layer and be provided with passivation layer between N doped layer and metal contact layer, described passivation layer has a large amount of nanometer connecting holes, described nanometer connecting hole connects P doped layer and N doped layer and metal contact layer; But this invention utilizes nano-pore connection metal contact layer that resistance can be made to increase, moreover manufacturing process is complicated, has higher requirement to manufacturing equipment.This invention can not be integrated into a module multi-disc solar cell and electric connection layer, and after cell piece is integrated into solar module, be not only convenient to be assembled into assembly, and the connection in series-parallel be convenient between adjusting module, thus be conducive to the series-parallel system adjusting cell piece in solar module, reduce the contact resistance of assembly.
In addition, to intersect or adjacent comparatively near because the wire be connected with P emitter and N emitter in prior art can be formed, solar cell use a period of time aging and external force touch after easily form short circuit, have a strong impact on the overall performance of battery component.
In sum, a kind ofly effectively can prevent P district current collector and the current collector short circuit of N district, low cost, low series resistance, resistance toly hiddenly to split, back contact solar cell assembly that high efficiency, high stability, easily technology are produced and preparation technology thereof need the technical problem of solution at present badly.
Utility model content
The purpose of this utility model is for the deficiencies in the prior art, provides one effectively can prevent P district current collector and the current collector short circuit of N district, low cost, low series resistance, resistance toly hiddenly to split, the simple back contact solar cell backboard of high efficiency, high stability, preparation technology, assembly.
The utility model provides a kind of without main grid high efficiency back contact solar cell backboard, and its main technical schemes is:
Describedly be followed successively by electric connection layer and basic unit from top to bottom without main grid high efficiency back contact solar cell backboard, described electric connection layer is connected by bonding agent with between basic unit; Described electric connection layer comprises through hole or runs through groove or run through groove, conductor wire, described conductor wire is arranged at the front and back of electric connection layer respectively, back side conductor wire is by described through hole or run through groove or the conducting medium run through in groove is connected to front, described electric connection layer is for connecting back contact battery sheet, and described electric connection layer is insulating material; The Thickness Ratio of described electric connection layer and described basic unit is 1: 1 ~ 1: 60.
The one that the utility model provides can also comprise following technical scheme without main grid high efficiency back contact solar cell backboard:
The electric connection layer of described backboard is provided with keeper.
Conductor wire on described electric connection layer is bending shape.
Described conductor wire is provided with secondary grid or conducting particles, for collecting electronics, described secondary grid or conducting particles and Electrode connection.
Described through hole or run through groove or run through groove for conical, namely through hole or the backside area that runs through groove or run through groove are greater than through hole or run through groove or run through the front face area of groove, and described electric connection layer is plastics.
Described front side conductive line is provided with conductive bumps.
The height of described conductive bumps structure is 250 microns ~ 400 microns.
The shape of described conductive bumps is selected from any one in cylinder, cone, parallelepiped, prism.
Distance between described adjacent conductive line is 0.1mm ~ 20mm.
The material of described conductor wire is any one in gold, silver, copper, aluminium, steel, copper cover aluminum or copper covered steel; The shape of cross section of described conductor wire is circular, square or any one in ellipse; The circumscribed circle diameter of described shape of cross section is 0.05mm ~ 1.5mm.
Described conductor wire surface is coated with low melting material or is coated with conducting resinl; Described low melting material is any one in tin, leypewter, tin pb-ag alloy, sn-bi alloy or tin pb-ag alloy; Coating or conductive adhesive layer thickness are 5 μm ~ 50 μm.
The quantity of described conductor wire is 10 ~ 500.
Described bonding agent is any one in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin.
Described electric connection layer is provided with bus bar electrode, and described P bus bar electrode and described N bus bar electrode are arranged at described electric connection layer both sides.
The surface of described bus bar electrode has concaveconvex shape.
The utility model additionally provides a kind of without main grid high efficiency back contact solar cell assembly, and its main technical schemes is:
Comprise the front layer material, encapsulating material, solar cell layer, the backboard that connect from top to bottom, it is characterized in that, described solar cell layer comprises several cell pieces, the shady face of described cell piece is arranged with the P electrode be connected with P type doped layer and the N electrode be connected with N-type doped layer, described cell piece is electrically connected with the electric connection layer on backboard, the backboard that described backboard limits for technique scheme.
The one that the utility model provides can also comprise following technical scheme without main grid high efficiency back contact solar cell assembly:
Described P electrode is point-like P electrode or line style P electrode, and described N electrode is point-like N electrode or line style N electrode.
The diameter of described point-like P electrode is 0.4mm ~ 1.5mm, and the distance between two that described same conductor wire connects adjacent point-like P electrode is 0.7mm ~ 10mm, and the width of described line style P electrode is 0.4mm ~ 1.5mm; The diameter of described point-like N electrode is 0.4mm ~ 1.5mm, and the distance between two that described same conductor wire connects adjacent point-like N electrode is 0.7mm ~ 10mm, and the width of described line style N electrode is 0.4mm ~ 1.5mm.
Total number of described point-like P electrode and described point-like N electrode is 1000 ~ 40000.
Described Spot electrodes or wire-type of electrode are coated with any one in silver slurry, conducting polymer, conducting resinl, scolding tin.
Insulating barrier place between described P electrode and N electrode is provided with thermoplastic resin or thermosetting resin.
Described resin be in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin any one or appoint several combination.
Described conducting resinl is low resistivity conductive bonded adhesives, and its main component is conducting particles and polymeric adhesive.
Conducting particles in described conducting resinl be in gold, silver, copper, gold-plated nickel, silver-plated nickel or silver-plated copper any one or appoint several combination; The shape of described conducting particles is spherical, sheet, in olive-shaped, needle-like any one or appoint several combinations; The particle diameter of conducting particles is 0.01 μm ~ 5 μm.
Polymeric adhesive in described conducting resinl is any one in epoxy resin, polyurethane resin, acrylic resin, organic siliconresin, and bonding agent can carry out hot curing or photocuring.
The electric connection layer of described backboard divides multiple module installation, forms battery module after loading onto cell piece; The bus bar electrode that described battery module is arranged by electric connection layer both sides connects; The cell piece number of described solar cell layer is 1 ~ 120, and wherein, comprise 1 ~ 120 battery module, described battery module comprises 1 ~ 120 cell piece.
Described solar cell backboard sub-module is arranged, and described backboard comprises more than one module, and wherein, the quantity of the cell piece number that the cell piece number that assembly comprises, rear panel module number, rear panel module comprise can by following equations; Z represents the total cell piece number of battery component, and Y represents the number of described rear panel module, and X represents the cell piece number that described rear panel module comprises, wherein 1≤Y≤X≤Z; X × Y=Z; As X=1, the length of a conductor wire is the length of one piece of cell piece; The integrated connection as Y=1, i.e. all cell pieces of a conductor wire connection battery component.
Enforcement of the present utility model comprises following technique effect:
1, the utility model proposes and a kind ofly use technology without main grid two-sided shape structure electric connection layer to realize the series connection of large scale back contacts solar cell and to make the method for corresponding solar components.This technology does not need, to the thin silver slurry of silk screen printing between adjacent P or the N emitter of IBC battery grid line, significantly to reduce the consumption of silver slurry, thus reduces the manufacturing cost of IBC battery and simplified manufacturing technique flow process.
2, back contact solar cell that the utility model uses is without the need to main grid, greatly reduces the use amount of silver slurry, the manufacturing cost of back contact battery is obviously reduced; One is that transformation efficiency is high, and two is that packaging efficiency is high, eliminates the shading loss of front gate line electrode, thus improves battery efficiency;
3, in the utility model, electrode of solar battery contacts with electric connection layer multiple spot distributing, reduces electron collection distance, significantly reduces the series resistance of assembly.Also can realize the sheet of battery, the metal connector device that series connection uses is all at cell backside, and the connection do not existed from front to the back side can use thinner silicon chip, thus reduce costs;
4, practicality is stronger, and back contacts solar cell of the present utility model is generally applicable to the various structures such as MWT, EWT and IBC;
5, resistance toly hiddenly to split, the photovoltaic system of Components integration that the utility model technology is produced can thoroughly be avoided because one piece of cell piece occurs hiddenly split and lose certain electric current and cause the electric current of whole group of string that the problem significantly reduced will occur, what propose due to this utility model achieves Mulit-point Connection between electric conductor and cell piece without main grid two-sided back of the body winding displacement technology, can improve whole system to manufacturing, transport, hiddenly splitting and the tolerance of fine fisssure of installing and produce in use procedure.
Secondary grid or conducting particles the migration distance that can reduce electronics and hole is set, strengthen the ability that cell piece collects electronics.Bus bar electrode concaveconvex shape the contact area that can increase electrode is set, reduce resistance.
This technology does not need to use conductive adhesive technique, thus saves the cost of conducting resinl and avoid conducting resinl and need the series of technical such as Accurate Points glue.This technology can realize welding between electric conductor with cell piece, can increase substantially the long-term reliability of assembly.In assembly prepared by this technology, Mulit-point Connection between IBC battery and electric conductor, tie point distribution is more intensive, several thousand even several ten thousand can be reached, more optimize with the path of fine fisssure position electric current conduction hidden the splitting of silicon chip, therefore the loss caused based on fine fisssure is greatly reduced, the Quality advance of product.Usually, in photovoltaic system, cell piece occurs hiddenly to split rear cell piece upper part region and can depart from main grid, and the electric current of this region generation cannot be collected.Photovoltaic system is all adopt the mode of series connection to form matrix, there is obvious bucket effect, when one piece of cell piece occur hidden split and lose certain electric current time whole group of string electric current will there is obvious reduction, thus cause the generating efficiency of whole group of string significantly to reduce.The photovoltaic system of the Components integration using this technology to produce can thoroughly avoid problems to occur, what propose due to this utility model achieves Mulit-point Connection between electric conductor and cell piece without main grid two-sided back of the body winding displacement technology, make whole photovoltaic system to manufacturing, transport, hiddenly splitting and hallrcuts has high tolerance of installing and produce in use procedure.Can illustrate with a simple example, the solar components that conventional art is produced similarly is common glass, a point has been crashed monolithic glass and has just been pulverized, similarly be then doubling safety glass with the assembly produced without main grid two-sided back of the body winding displacement technology, point is cracked to have seemed unsightly in appearance, but the function of keeping out wind and rain of whole glass also exists.The traditional battery pack string technique of this technological break-through, makes battery arrange freer, more closely, the assembly of above-mentioned technology is adopted to be expected to less lighter, concerning the project development of downstream, this just means floor space less in installation, lower roof load-bearing requirements and lower human cost.The connectivity problem of low cost, high efficiency back contacts solar cell can be solved without main grid back of the body winding displacement technology, silver-colored main grid is replaced to reduce costs by using copper cash, realize the industrial-scale production that back contacts solar cell is real, reduce costs while raising the efficiency, for photovoltaic system provides that efficiency is higher, cost is lower, stability is higher, resistance toly hiddenly splits outstanding photovoltaic module, greatly promote the competitiveness of photovoltaic system and traditional energy.
The utility model use back contact solar cell overall structure basically identical with conventional back contact solar cell, but thermoplasticity or heat cured resin in the insulating barrier place silk screen printing after back contact solar cell completes silver slurry sintering and the test of power stepping between its emitter region electrode and base electrode.This resin can play the effect being separated insulating emitter region electrode and base electrode on the one hand, plays the effect of bonding back contact solar cell sheet and backboard on the one hand in lamination process.
Another of conductive backings that the utility model uses is specific is have location to indicate, and is printed with anchor point at the ad-hoc location of conductive backings.The design principle of conductive backings anchor point is that the relative position of metal wire on anchor point and backboard is accurately fixed, can be easy to identify the anchor point on backboard by CCD technology, by identifying that the back contact solar cell sheet scribbling conducting resinl can be positioned over the relevant position of conductive backings by anchor point accurately, the conductive wire that on back contact battery sheet, emitter region electrode and base electrode are corresponding in conductive backings is contacted by conducting resinl.
Accompanying drawing explanation
Fig. 1. point back contact rear surface of solar cell schematic diagram
Fig. 2. line style back contact solar cell schematic rear view
Fig. 3. conductor wire sectional view (Fig. 3 a, conductor wire sectional view, Fig. 3 b, two-layer conductor wire sectional view, Fig. 3 c, three layers of conductor wire sectional view)
Fig. 4. the electric connection layer schematic cross-section of bilateral structure
Fig. 5. the schematic cross-section in solar cell backboard after electric connection layer and cell piece Electrode connection
Fig. 6. solar module schematic cross-section
Fig. 7. load onto the solar module schematic diagram of cell piece
1, be the metal materials such as copper, aluminium or steel, 2, be the metal material such as the aluminium different from 1 or steel; 3, be tin, tin lead, tin bismuth or the plumbous silver metal solder of tin; 4, N-type doped layer; 41, line style N electrode; 42, point-like N electrode; 43, N bus bar electrode; 5, P type doping property; 51, line style P electrode; 52, point-like P electrode; 53, P bus bar electrode; 6, the matrix silicon chip of back contact battery; 7, front side conductive line; 8, back side conductor wire.9, conducting medium; 10, backboard; 11, front layer material; 12, electric connection layer; 13, encapsulating material.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the utility model is described in detail, it is pointed out that described embodiment is only intended to be convenient to understanding of the present utility model, and any restriction effect is not play to it.
Embodiment 1
See Fig. 1, Fig. 3, Fig. 4, Fig. 5, the one that the present embodiment provides is without main grid high efficiency back contact solar cell backboard, described back contact solar cells backboard is followed successively by electric connection layer 12 and basic unit from top to bottom, and described electric connection layer 12 is connected by bonding agent with between basic unit; Described electric connection layer 12 comprises through hole, conductor wire, described conductor wire is arranged at the front and back of electric connection layer 12 respectively, back side conductor wire is connected to front by the conducting medium 9 in described through hole, described electric connection layer 12 is for connecting back contact battery sheet, and described electric connection layer is insulating material.The electric connection layer 12 of described backboard is provided with keeper, is convenient to aligning when cell piece is connected with electric connection layer 12; Described electric connection layer 12 can be pressure-sensitive insulating material, makes conductor wire can be pressed in electric connection layer 12; The Thickness Ratio of described electric connection layer and described basic unit is 1: 1 ~ 1: 60.
See Fig. 3, the material of described conductor wire that the present embodiment uses is gold, silver, any one in copper, aluminium, steel, copper cover aluminum or copper covered steel, the excellent silver of the present embodiment; The shape of cross section of described conductor wire is circular, square or any one in ellipse, and the present embodiment is excellent square; Described conductor wire is the coating conductor wire with three-decker, and the conductor wire diameter comprising innermost layer is the layers of copper in 0.8mm, intermediate layer, and thickness is 0.2mm, and outermost layer is tin coating, and thickness is 0.3mm.Described conductor wire surface-coated has conducting resinl; Conducting particles in described conducting resinl is the combination of any one or several in gold, silver, copper, gold-plated nickel, silver-plated nickel or silver-plated copper, the present embodiment preferably copper; Described conducting resinl is low resistivity conductive bonded adhesives, and its main component is conducting particles and polymeric adhesive; The shape of described conducting particles is the combination of any one or several in spherical, sheet, olive-shaped, needle-like, the preferred needle-like of the present embodiment; The particle diameter of conducting particles is 0.01 μm ~ 5 μm, the present embodiment preferably 5 μm.Polymeric adhesive in described conducting resinl is any one in the epoxy resin of one-component or two component, polyurethane resin, acrylic resin, organic siliconresin, the present embodiment preferred epoxy, and can carry out hot curing or photocuring, and preparation technology is simple.
Described conductor wire is provided with secondary grid or conducting particles, for collecting electronics, described secondary grid or conducting particles and Electrode connection; The backside area of described through hole is greater than through hole or runs through the front face area of groove, can be conical; Described electric connection layer 12 is plastics; Described front side conductive line is provided with conductive bumps; The height of described conductive bumps structure is 250 microns ~ 400 microns, the present embodiment preferably 250 microns; The shape of described conductive bumps is selected from any one in cylinder, cone, parallelepiped or prism, the preferred cone of the present embodiment; The setting of described conductive bumps is beneficial to the compact siro spinning technology of conductivity and cell piece electrode; Described electric connection layer 12 is provided with bus bar electrode, and described P bus bar electrode and described N bus bar electrode are arranged at described electric connection layer 12 both sides; The surface of described bus bar electrode has concaveconvex shape, can increase the ohmic contact area of bus bar electrode, reduces resistance; The cross section of described busbar is 5mm × 0.22mm.
The one that the present embodiment provides is without main grid high efficiency back contact solar cell assembly, comprise the front layer material 11 connected from top to bottom, encapsulating material 13, solar cell layer, backboard 10, it is characterized in that, described solar cell layer comprises several cell pieces, the shady face of described cell piece is arranged with the point-like P electrode 52 be connected with P type doped layer 5 and the point-like N electrode 42 be connected with N-type doped layer 4, described cell piece is electrically connected with the electric connection layer 12 on backboard, described backboard can be arranged by sub-module, each cell piece can install polylith cell piece, each module installation electric connection layer 12 is for installing cell piece, be electrically connected by the busbar of electric connection layer 12 between multiple module.Also can an electric connection layer 12 be only set on backboard.
Insulating barrier place between described P electrode and described N electrode is provided with thermoplastic resin or thermosetting resin, described resin is any one in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin, the present embodiment preferred polyolefm resin, can prevent the short circuit between electrode.
See Fig. 1, described cell piece is n type single crystal silicon matrix silicon, described P electrode is point-like P electrode 52, described N electrode is point-like N electrode 42, described point-like P electrode 52 and described point-like N electrode 42 are located at the back side of silicon substrate, point-like P electrode 52 and point-like N electrode 42 are arranged alternately with each other the back side at silicon substrate, point-like P electrode 52 is provided with positive electrode contact point, total number that point-like N electrode 42 is provided with point-like P electrode 52 described in negative electrode contact point and described point-like N electrode 42 is 1000 ~ 40000, the present embodiment preferably 2080; The diameter of point-like P electrode 52 is 0.8mm, and the distance between adjacent point-like P electrode 52 is 1.5mm.The diameter of point-like N electrode 42 is 0.7mm, distance between adjacent point-like N electrode 42 is 1.5mm, centre distance between point-like P electrode 52 line and point-like N electrode 42 line is 15mm, and the setting of above-mentioned Spot electrodes design parameter is convenient in the present embodiment to be connected, can good collected current.Cell conversion efficiency is 20.2%.
A kind of preparation method without main grid high efficiency back contact solar cell assembly:
As shown in Figure 4, punch forming through hole on the electric connection layer 12 of insulating material; Tighten stretching for some conductor wires arranged in parallel, conductor wire bonding agent is bonding with the front of electric connection layer 12, the bonding conductor wire be connected with through hole at the back side of electric connection layer 12; Filled conductive medium 9 in through hole;
The double-side type backboard wide cut 651mm that the present embodiment uses, length 662mm.In 156 × 156mm area that every sheet back contact battery sheet is corresponding, correspondence is arranged 150 conductor wires, wherein 75 corresponding with emitter region contact point, be arranged at the back side of electric connection layer 12, remain 75 fronts of being arranged at electric connection layer 12 corresponding to base contact point.The conductor wire corresponding with emitter region contact point and the conductor wire cross arrangement corresponding with base contact point.Conductor wire is TU1 copper free wire, and cross sectional dimensions is 0.5 × 0.25mm.Adhesive for polyurethane is used electric connection layer to be fixed on the relevant position of backboard.As shown in Figure 5.
Use silk screen printing even coated with conductive glue on all contacting points positions on cell piece, on each contact point, conductive glue amount is 0.2mg.The epoxy resin of the polymeric adhesive serviceability temperature solidification of conducting resinl, conducting particles is wherein the flake silver powder of particle diameter 0.3 μm.The back contact battery scribbling conducting resinl is positioned the upper left corner being positioned over backboard according to the keeper of backboard, then second back contact battery is rotated 180 DEG C at horizontal plane, when two panels battery edge aligns, the emitter region contact point in second back contact battery is just in time in and is just in time on same conductor wire with the base origination point in first back contact battery.The rest may be inferred forms cascaded structure as shown in Figure 5.
Use the general busbar of routine of 5 × 0.22mm cross-sectional area to connect the series-connected battery string as shown in Figure 5 laid, produce 8 strings, often go here and there 4, the cell piece group of totally 32 back contacts.Upper strata EVA and glass is placed successively again on cell piece.Module feeding laminating machine after stacked is carried out lamination, and laminating parameters sets according to the vulcanization characteristics of EVA, is generally 145 DEG C of laminated 16 minutes.The module finally completed by lamination carries out installation metal edge frame, installs terminal box and carry out power test and visual examination, and the sensitive surface of described solar module is provided with the good fluoropolymer membrane material of weather resisteant.As shown in Figure 6 and Figure 7.
The power parameter of above-mentioned 32 back contacts assemblies is as follows:
Open circuit voltage Uoc (V) 22.08
Short circuit current Isc (A) 9.28
Operating voltage Ump (V) 17.24
Operating current Imp (A) 9.10
Maximum power Pmax (W) 156.88
Fill factor, curve factor 76.56%
Embodiment 2
See Fig. 2, Fig. 3, Fig. 4, Fig. 7, the one that the present embodiment provides is without main grid high efficiency back contact solar cell backboard, described back contact solar cells backboard is followed successively by electric connection layer 12 and basic unit from top to bottom, and described electric connection layer 12 is connected by bonding agent with between basic unit; Described electric connection layer 12 comprises and runs through groove, conductor wire, described conductor wire is arranged at the front and back of electric connection layer 12 respectively, the conducting medium 9 run through described in back side conductor wire passes through in groove is connected to front, described electric connection layer 12 is for connecting back contact battery sheet, and described electric connection layer 12 is insulating material.The electric connection layer 12 of described backboard is provided with keeper, is convenient to aligning when cell piece is connected with electric connection layer 12; Described electric connection layer 12 can be pressure-sensitive insulating material, makes conductor wire can be pressed in electric connection layer 12; The Thickness Ratio of described electric connection layer and described basic unit is 1: 1 ~ 1: 60.
See Fig. 3, the material of described conductor wire that the present embodiment uses is gold, silver, any one in copper, aluminium, steel, copper cover aluminum or copper covered steel, the excellent silver of the present embodiment; The shape of cross section of described conductor wire is circular, square or any one in ellipse, the excellent ellipse of the present embodiment; Described conductor wire is the coating conductor wire with double-layer structure, and the conductor wire diameter comprising innermost layer is 0.8mm, and outermost layer is tin coating, and thickness is 0.3mm.Described conductor wire surface-coated has conducting resinl; Conducting particles in described conducting resinl is the combination of any one or several in gold, silver, copper, gold-plated nickel, silver-plated nickel or silver-plated copper, and the present embodiment is preferably silver-colored; Described conducting resinl is low resistivity conductive bonded adhesives, and its main component is conducting particles and polymeric adhesive; The shape of described conducting particles is the combination of any one or several in spherical, sheet, olive-shaped, needle-like, and the present embodiment is preferably olive-shaped; The particle diameter of conducting particles is 0.01 μm ~ 5 μm, the present embodiment preferably 2 μm.Polymeric adhesive in described conducting resinl is any one in the epoxy resin of one-component or two component, polyurethane resin, acrylic resin, organic siliconresin, the present embodiment optimization polyurethane resin, and can carry out hot curing or photocuring, and preparation technology is simple.
Described conductor wire is provided with secondary grid or conducting particles, for collecting electronics, described secondary grid or conducting particles and Electrode connection; The backside area of described through hole is greater than through hole or runs through the front face area of groove, can be conical; Described electric connection layer 12 is plastics; Described electric connection layer 12 is provided with bus bar electrode, and described P bus bar electrode and described N bus bar electrode are arranged at described electric connection layer 12 both sides; The surface of described bus bar electrode has concaveconvex shape, can increase the ohmic contact area of bus bar electrode, reduces resistance; The cross section of described busbar is 5mm × 0.22mm.
The one that the present embodiment provides is without main grid high efficiency back contact solar cell assembly, comprise the front layer material 11 connected from top to bottom, encapsulating material 13, solar cell layer, backboard 10, it is characterized in that, described solar cell layer comprises several cell pieces, the shady face of described cell piece is arranged with the line style P electrode 51 be connected with P type doped layer 5 and the line style N electrode 41 be connected with N-type doped layer 4, described cell piece is electrically connected with the electric connection layer 12 on backboard, described backboard can be arranged by sub-module, each cell piece can install polylith cell piece, each module installation electric connection layer 12 is for installing cell piece, be electrically connected by the busbar of electric connection layer 12 between multiple module.Also can an electric connection layer 12 be only set on backboard.
Insulating barrier place between described P electrode and described N electrode is provided with thermoplastic resin or thermosetting resin, described resin is any one in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin, the present embodiment preferred acrylic resins, can prevent the short circuit between electrode.
See Fig. 2, described cell piece is n type single crystal silicon matrix silicon, described P electrode is line style P electrode 51, described N electrode is line style N electrode 41, described line style P electrode 51 and described line style N electrode 41 are located at the back side of silicon substrate, line style P electrode 51 and line style N electrode 41 are arranged alternately with each other the back side at silicon substrate, and the distance between adjacent line style P electrode 51 is 1.5mm; Distance between adjacent line style N electrode 41 is the setting convenient connection in the present embodiment of the above-mentioned Spot electrodes design parameter of 1.5mm, can good collected current.Cell conversion efficiency is 20.2%.
A kind of preparation method without main grid high efficiency back contact solar cell assembly:
Prepare electric connection layer 12: etch on the electric connection layer 12 with insulating material and shapingly run through groove; Tighten stretching for some conductor wires arranged in parallel, conductor wire bonding agent is bonding with the front of electric connection layer 12, the bonding conductor wire with running through groove and being connected at the back side of electric connection layer 12; Running through filled conductive medium 9 in groove;
The double-side type conductive backings wide cut 986mm that the present embodiment uses, length 1662mm.In 156 × 156mm area that every sheet back contact battery sheet is corresponding, correspondence is arranged 76 conduction conductor wires, be arranged at front and the reverse side of electric connection layer 12, wherein 38 corresponding with line style P electrode district, remain 38 corresponding with line style N electrode, be arranged at the back side of electric connection layer 12.Being that the conductor wire of the tin coating of 1.3mm is stretching successively by the diameter with three-decker that 38 154mm are long tightens the front being bonded in described electric connection layer 12 according to the back side figure of back contacts solar cell; Fill scolding tin running through in groove; Again coating conductor wire of the same type long for 38 298mm is bonded in the back side of described electric connection layer 12 according to back contacts solar cell, and be electrically connected with the described scolding tin run through in groove, the length running through groove string is 298mm, again the coating conductor wire of the same type that 38 298mm are long is positioned over described electric connection layer 12 front according to the back side figure of back contacts solar cell, by that analogy, last bonding with sun backboard, form structure as shown in Figure 5.The conductor wire corresponding with line style emitter region and the conductor wire cross arrangement corresponding with line style base.Conductor wire cross sectional dimensions is 0.7 × 0.2mm.Polyacrylic acid adhesive is used conductor wire to be fixed on the relevant position of backboard.
First use silk screen printing even coated with conductive glue on position, all contact zones on cell piece, on every bar line style contact zone, conductive glue amount is 25mg.The polyurethane resin of the polymeric adhesive serviceability temperature solidification of conducting resinl, conducting particles is wherein the gold-plated nickel ball of particle diameter 0.5 μm.The first back contact battery scribbling conducting resinl is positioned the upper left corner being positioned over backboard according to the anchor point of backboard, then second back contact battery is revolved turnback at horizontal plane, when two panels battery edge aligns, the contact zone, emitter region in second back contact battery is just in time in and is just in time on same conductor wire with the base origination point in first back contact battery.The rest may be inferred forms cascaded structure as shown in Figure 5.
Use the general busbar of routine of 4 × 0.25mm cross-sectional area to connect the series-connected battery string as shown in Figure 5 laid, produce 6 strings, often go here and there 10, the cell piece group of totally 60 back contacts.Upper strata EVA and glass is placed successively again on cell piece.Module feeding laminating machine after stacked is carried out lamination, and laminating parameters sets according to the vulcanization characteristics of EVA, is generally 145 DEG C of laminated 16 minutes.The module finally completed by lamination carries out installation metal edge frame, installs terminal box and carry out power test and visual examination.The sensitive surface of described solar module is provided with the good fluoropolymer membrane material of weather resisteant.As shown in Figure 6 and Figure 7.
The power parameter of above-mentioned 60 back contacts assemblies is as follows:
Open circuit voltage Uoc (V) 41.48
Short circuit current Isc (A) 9.29
Operating voltage μm p (V) 32.81
Operating current Imp (A) 9.12
Maximum power Pmax (W) 299.23
Fill factor, curve factor 77.65%
Embodiment 3
See Fig. 1, Fig. 3, Fig. 4, Fig. 5, the one that the present embodiment provides is without main grid high efficiency back contact solar cell backboard, described back contact solar cells backboard is followed successively by electric connection layer 12 and basic unit from top to bottom, and described electric connection layer 12 is connected by bonding agent with between basic unit; Described electric connection layer 12 comprises through hole, conductor wire, described conductor wire is arranged at the front and back of electric connection layer 12 respectively, back side conductor wire is connected to front by the conducting medium 9 in described through hole, described electric connection layer 12 is for connecting back contact battery sheet, and described electric connection layer 12 is insulating material.The electric connection layer 12 of described backboard is provided with keeper, is convenient to aligning when cell piece is connected with electric connection layer 12; Described electric connection layer 12 can be pressure-sensitive insulating material, makes conductor wire can be pressed in electric connection layer 12; The Thickness Ratio of described electric connection layer and described basic unit is 1: 1 ~ 1: 60.
See Fig. 3, the material of described conductor wire that the present embodiment uses is gold, silver, any one in copper, aluminium, steel, copper cover aluminum or copper covered steel, the excellent aluminium of the present embodiment or copper; The shape of cross section of described conductor wire is circular, square or any one in ellipse, and the present embodiment is excellent square; Described conductor wire is the coating conductor wire with three-decker, and the conductor wire diameter comprising innermost layer copper is the aluminium lamination in 0.8mm, intermediate layer, and thickness is 0.2mm, and outermost layer is tin coating, and thickness is 0.3mm.Described conductor wire surface-coated has conducting resinl; Conducting particles in described conducting resinl is the combination of any one or several in gold, silver, copper, gold-plated nickel, silver-plated nickel or silver-plated copper, the preferred silver-plated nickel of the present embodiment; Described conducting resinl is low resistivity conductive bonded adhesives, and its main component is conducting particles and polymeric adhesive; The shape of described conducting particles is the combination of any one or several in spherical, sheet, olive-shaped, needle-like, the preferred sheet of the present embodiment; The particle diameter of conducting particles is 0.01 μm ~ 5 μm, the present embodiment preferably 0.01 μm.Polymeric adhesive in described conducting resinl is any one in the epoxy resin of one-component or two component, polyurethane resin, acrylic resin, organic siliconresin, the present embodiment preferred epoxy, and can carry out hot curing or photocuring, and preparation technology is simple.
Described conductor wire is provided with secondary grid or conducting particles, for collecting electronics, described secondary grid or conducting particles and Electrode connection; The backside area of described through hole is greater than through hole or runs through the front face area of groove, can be conical; Described electric connection layer 12 is plastics; Described front side conductive line is provided with conductive bumps; The height of described conductive bumps structure is 250 microns ~ 400 microns, the present embodiment preferably 400 microns; The shape of described conductive bumps is selected from any one in cylinder, cone, parallelepiped or prism, the preferred cone of the present embodiment; The setting of described conductive bumps is beneficial to the compact siro spinning technology of conductivity and cell piece electrode; Described electric connection layer 12 is provided with bus bar electrode, and described P bus bar electrode and described N bus bar electrode are arranged at described electric connection layer 12 both sides; The surface of described bus bar electrode has concaveconvex shape, can increase the ohmic contact area of bus bar electrode, reduces resistance; The cross section of described busbar is 5mm × 0.22mm.
The one that the present embodiment provides is without main grid high efficiency back contact solar cell assembly, comprise the front layer material 11 connected from top to bottom, encapsulating material 13, solar cell layer, backboard 10, it is characterized in that, described solar cell layer comprises several cell pieces, the shady face of described cell piece is arranged with the point-like P electrode 52 be connected with P type doped layer 5 and the point-like N electrode 42 be connected with N-type doped layer 4, described cell piece is electrically connected with the electric connection layer 12 on backboard, described backboard can be arranged by sub-module, each cell piece can install polylith cell piece, each module installation electric connection layer 12 is for installing cell piece, be electrically connected by the busbar of electric connection layer 12 between multiple module.Also can an electric connection layer 12 be only set on backboard.
Insulating barrier place between described P electrode and described N electrode is provided with thermoplastic resin or thermosetting resin, described resin is any one in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin, the present embodiment preferred polyolefm resin, can prevent the short circuit between electrode.
See Fig. 1, described cell piece is n type single crystal silicon matrix silicon, described P electrode is point-like P electrode 52, described N electrode is point-like N electrode 42, described point-like P electrode 52 and described point-like N electrode 42 are located at the back side of silicon substrate, point-like P electrode 52 and point-like N electrode 42 are arranged alternately with each other the back side at silicon substrate, point-like P electrode 52 is provided with positive electrode contact point, total number that point-like N electrode 42 is provided with point-like P electrode 52 described in negative electrode contact point and described point-like N electrode 42 is 1000 ~ 40000, the present embodiment preferably 2420; The diameter of point-like P electrode 52 is 0.8mm, and the distance between adjacent point-like P electrode 52 is 1.5mm.The diameter of point-like N electrode 42 is 0.7mm, distance between adjacent point-like N electrode 42 is 1.5mm, centre distance between point-like P electrode 52 line and point-like N electrode 42 line is 15mm, and the setting of above-mentioned Spot electrodes design parameter is convenient in the present embodiment to be connected, can good collected current.Cell conversion efficiency is 20.2%.
A kind of preparation method without main grid high efficiency back contact solar cell assembly:
As shown in Figure 4, punch forming through hole on the electric connection layer 12 of insulating material; Tighten stretching for some conductor wires arranged in parallel, conductor wire bonding agent is bonding with the front of electric connection layer 12, the bonding conductor wire be connected with through hole at the back side of electric connection layer 12; Filled conductive medium 9 in through hole;
The double-side type backboard wide cut 651mm that the present embodiment uses, length 662mm.In 156 × 156mm area that every sheet back contact battery sheet is corresponding, correspondence is arranged 160 conduction conductor wires, wherein 80 corresponding with emitter region contact point, be arranged at the back side of electric connection layer 12, remain 80 fronts of being arranged at electric connection layer 12 corresponding to base contact point.The conductor wire corresponding with emitter region contact point and the conductor wire cross arrangement corresponding with base contact point.Conductor wire is TU1 copper free wire, and cross sectional dimensions is 0.5 × 0.25mm.Adhesive for polyurethane is used conductor wire to be fixed on the relevant position of backboard.As shown in Figure 5.
Use silk screen printing even coated with conductive glue on all contacting points positions on cell piece, on each contact point, conductive glue amount is 0.2mg.The epoxy resin of the polymeric adhesive serviceability temperature solidification of conducting resinl, conducting particles is wherein the flake silver powder of particle diameter 0.3 μm.The back contact battery scribbling conducting resinl is positioned the upper left corner being positioned over backboard according to the keeper of backboard, then second back contact battery is rotated 180 DEG C at horizontal plane, when two panels battery edge aligns, the emitter region contact point in second back contact battery is just in time in and is just in time on same conductor wire with the base origination point in first back contact battery.The rest may be inferred forms cascaded structure as shown in Figure 5.
Use the general busbar of routine of 5 × 0.22mm cross-sectional area to connect the series-connected battery string as shown in Figure 5 laid, produce 8 strings, often go here and there 4, the cell piece group of totally 32 back contacts.Upper strata EVA and glass is placed successively again on cell piece.Module feeding laminating machine after stacked is carried out lamination, and laminating parameters sets according to the vulcanization characteristics of EVA, is generally 145 DEG C of laminated 16 minutes.The module finally completed by lamination carries out installation metal edge frame, installs terminal box and carry out power test and visual examination, and the sensitive surface of described solar module is provided with the good fluoropolymer membrane material of weather resisteant.As shown in Figure 6 and Figure 7.
The power parameter of above-mentioned 32 back contacts assemblies is as follows:
Open circuit voltage Uoc (V) 22.25
Short circuit current Isc (A) 9.25
Operating voltage Ump (V) 17.27
Operating current Imp (A) 9.08
Maximum power Pmax (W) 156.78
Fill factor, curve factor 76.18%
From the experiment parameter of embodiment 1-3, the solar module packaged by back contacts solar cell backboard prepared by the utility model can obtain very high fill factor, curve factor, thus improves the generating efficiency of assembly.Effectively can prevent the short circuit between P electrode and N electrode, resistance toly hiddenly to split, high efficiency, high stability, there is preparation technology simultaneously simple, the advantage that cost reduces greatly.
Finally should be noted that; above embodiment is only in order to illustrate the technical solution of the utility model; but not the restriction to the utility model protection range; although done to explain to the utility model with reference to preferred embodiment; those of ordinary skill in the art is to be understood that; can modify to the technical solution of the utility model or equivalent replacement, and not depart from essence and the scope of technical solutions of the utility model.
Claims (10)
1., without main grid high efficiency back contact solar cell backboard, it is characterized in that: back contact solar cells backboard is followed successively by electric connection layer and basic unit from top to bottom, described electric connection layer is connected by bonding agent with between basic unit; Described electric connection layer comprises through hole or runs through groove, conductor wire, described conductor wire is arranged at the front and back of electric connection layer respectively, back side conductor wire is then connected to front by described through hole or the conducting medium run through in groove, described electric connection layer is for connecting back contact battery sheet, and described electric connection layer is insulating material; The Thickness Ratio of described electric connection layer and described basic unit is 1: 1 ~ 1: 60.
2. according to claim 1 without main grid high efficiency back contact solar cell backboard, it is characterized in that: the electric connection layer of described backboard is provided with keeper; Conductor wire on described electric connection layer is bending shape; Described conductor wire is provided with secondary grid or conducting particles, for collecting electronics, described secondary grid or conducting particles and Electrode connection.
3. according to claim 1 without main grid high efficiency back contact solar cell backboard, it is characterized in that: described through hole or the backside area running through groove are greater than through hole or run through the front face area of groove, and described electric connection layer is plastics.
4. according to claim 1 without main grid high efficiency back contact solar cell backboard, it is characterized in that: described conductor wire surface is coated with low melting material or is coated with conducting resinl; Described low melting material is any one in tin, leypewter, sn-bi alloy or tin pb-ag alloy; Coating or conductive adhesive layer thickness are 5 μm ~ 50 μm; The quantity of described conductor wire is 10 ~ 500; Described bonding agent is any one in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin or organic siliconresin.
5. according to claim 1ly it is characterized in that: described electric connection layer is provided with bus bar electrode without main grid high efficiency back contact solar cell backboard, P bus bar electrode and N bus bar electrode are arranged at described electric connection layer both sides.
6. without main grid high efficiency back contact solar cell assembly, it is characterized in that: comprise the front layer material, encapsulating material, solar cell layer, the backboard that connect from top to bottom, described solar cell layer comprises several cell pieces, the shady face of described cell piece is arranged with the P electrode be connected with P type doped layer and the N electrode be connected with N-type doped layer, described cell piece is electrically connected with the electric connection layer on backboard, and described backboard is the arbitrary described backboard of claim 1-5.
7. according to claim 6 without main grid high efficiency back contact solar cell assembly, it is characterized in that: described P electrode is point-like P electrode or line style P electrode, described N electrode is point-like N electrode or line style N electrode; The diameter of described point-like P electrode is 0.4mm ~ 1.5mm, and the distance between two that same conductor wire connects adjacent point-like P electrode is 0.7mm ~ 10mm, and the width of described line style P electrode is 0.4mm ~ 1.5mm; The diameter of described point-like N electrode is 0.4mm ~ 1.5mm, and the distance between two that described same conductor wire connects adjacent point-like N electrode is 0.7mm ~ 10mm, and the width of described line style N electrode is 0.4mm ~ 1.5mm; Total number of described point-like P electrode and described point-like N electrode is 1000 ~ 40000.
8. according to claim 7 without main grid high efficiency back contact solar cell assembly, it is characterized in that: described Spot electrodes or wire-type of electrode are coated with any one in silver slurry, conducting polymer, conducting resinl, scolding tin; Described conducting resinl is low resistivity conductive bonded adhesives, and its main component is conducting particles and polymeric adhesive; Conducting particles in described conducting resinl be in gold, silver, copper, gold-plated nickel, silver-plated nickel or silver-plated copper any one or appoint several combination; The shape of described conducting particles is spherical, sheet, in olive-shaped, needle-like any one or appoint several combinations; The particle diameter of conducting particles is 0.01 μm ~ 5 μm; Polymeric adhesive in described conducting resinl is any one in epoxy resin, polyurethane resin, acrylic resin, organic siliconresin, and bonding agent can carry out hot curing or photocuring.
9. according to claim 6 without main grid high efficiency back contact solar cell assembly, it is characterized in that: the insulating barrier place between described P electrode and N electrode is provided with thermoplastic resin or thermosetting resin; Described resin be in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin any one or appoint several combination.
10. according to claim 6 without main grid high efficiency back contact solar cell assembly, it is characterized in that: the electric connection layer of described backboard divides multiple module installation, forms battery module after loading onto cell piece; The bus bar electrode that described battery module is arranged by electric connection layer both sides connects; The cell piece number of described solar cell layer is 1 ~ 120, and wherein, comprise 1 ~ 120 battery module, described battery module comprises 1 ~ 120 cell piece.
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