CN204088344U - Without main grid high efficiency back contact solar cell module and assembly - Google Patents

Abstract

The utility model relates to area of solar cell, particularly a kind of without main grid high efficiency back contact solar cell module and assembly.This solar module comprises cell piece and electric connection layer, the shady face of described cell piece has the P electrode be connected with P type doped layer and the N electrode be connected with N-type doped layer, it is characterized in that: described electric connection layer comprises conductor wire, insulated wire, described conductor wire and insulated wire are network structure by braiding, described adjacent conductive line is asked and is woven with insulated wire, and described some conductor wires are electrically connected with P electrode or N electrode respectively.Its beneficial effect is, provide a kind of and effectively can prevent that P electrode and N electrode short circuit, low cost, Gao Naiyin from splitting, high efficiency, high stability without main grid high efficiency back contact solar cell module and assembly.

Description

Without main grid high efficiency back contact solar cell module and assembly

Technical field

The utility model relates to area of solar cell, particularly without main grid high efficiency back contact solar cell module 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, the loss using which kind of zinc-plated welding that series resistance all can be brought to bring and optical loss, be 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, develop without main grid back contact solar cell, 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 backsheet, conduction backsheet 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 conduction backsheet 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 backsheet 1, used is composite conducting metal forming in backsheet, is generally Copper Foil, and need to carry out laser ablation or chemical corrosion to Copper Foil.Because laser ablation still can operate for simple graph, slow for complex pattern etching speed, production efficiency is low, and chemical corrosion is previously prepared complex-shaped and also there is environmental pollution and corrosive liquid except corrosion resistant mask to the corrosion of polymer base material except needing.The conductivity type backsheet 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 in backsheet, 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 decreasing 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 reduced 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, prior art also occurs multiple to the improvement of IBC without main grid back contact solar cell, Sunpower company is that adjacent P or N emitter is guided to battery edge by the connected electric current the most at last of the thin grid line of silver slurry silk screen printing by this invention, re-use connecting band at the solder joint that the printing of cell piece edge is larger and carry out welding series connection, 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.

Patent WO2011143341A2 discloses a kind of without main grid 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, and manufacturing process is complicated, has higher requirement to manufacturing equipment, this invention can not realize multi-disc solar cell and electric connection layer to be integrated into a module.And realize cell piece and be integrated into solar module, not only ease of assembly becomes assembly, and facilitates the connection in series-parallel between adjusting module, thus the series-parallel system of cell piece in convenient adjustment solar module, reduce the contact resistance of assembly.

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.The elongated conductive part that this invention adopts makes solar cell have good current collection performance, but needing to be provided with a large amount of electric-conductors carrys out effective collected current, and therefore cause manufacturing cost to increase, processing step is complicated.

Patent EP2709162A1 discloses a kind of solar cell, applies to without main grid 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, twice connection brings technologic complexity, and cause too much electrode contact point, may cause " disconnection " or " even wrong ", be unfavorable for the overall performance without main grid back contact solar cell.

Because the invention in this field current uses thin grid line 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 to 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 brings 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.

Utility model content

The purpose of this utility model is for the deficiencies in the prior art, provides a kind of structure simple assembled battery sheet convenience, low cost, resistance toly hiddenly to split, high efficiency, stability are high without main grid high efficiency back contact solar cell module and assembly.

A kind of technical scheme without main grid high efficiency back contact solar cell module, assembly and preparation method thereof that the utility model provides is:

A kind of without main grid high efficiency back contact solar cell module, this solar module comprises cell piece and electric connection layer, the shady face of described cell piece has the P electrode be connected with P type doped layer and the N electrode be connected with N-type doped layer, described electric connection layer comprises conductor wire, insulated wire, described conductor wire and insulated wire are network structure by braiding, insulated wire is woven with between described adjacent conductive line, described some conductor wires are electrically connected with P electrode or N electrode respectively, described back contact solar cell module area and described cell piece area ratio are 1.05: 1 ~ 100: 1.

Described conductor wire is electrically connected by point-like P electrode or line style P electrode with described P electrode, and described conductor wire is electrically connected by point-like N electrode or line style N electrode with described N electrode.

The diameter of described point-like P electrode is 0.4mm ~ 1.5mm, and the width of described line style P electrode is 0.4mm ~ 1.5mm, the distance 0.7mm ~ 10mm between two that described same conductor wire connects adjacent point-like P electrode or line style P electrode; The diameter of described point-like N electrode is 0.4mm ~ 1.5mm, and the width of described line style N electrode is 0.4mm ~ 1.5mm, the distance 7mm ~ 10mm between two that described same conductor wire connects adjacent point-like N electrode or line style N electrode.

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 material are any one in silver slurry, conducting resinl, scolding tin.

Distance between the conductor wire be connected with described N electrode that the conductor wire be connected with described P electrode is adjacent is 0.1mm ~ 30mm; Distance between the described and adjacent, parallel arrangement insulated wire of conductor wire vertical woven is 0 ~ 30mm.

The material of described conductor wire is any one or several combinations in copper, aluminium, steel, copper cover aluminum, copper covered steel; The shape of cross section of described conductor wire is any one or several combinations in circular, square, ellipse; The circumscribed circle diameter of described conductor wire shape of cross section is 0.05mm ~ 1.5mm.

The material of described insulated wire is any one in resin, plastics, silicon rubber, PVC; The shape of cross section of described insulated wire is any one in circular, square, ellipse; The circumscribed circle diameter of described insulated wire shape of cross section is 0.05mm ~ 1mm.

Described conductor wire surface is coated with anti-oxidation coating material or is coated with conducting resinl.

Described anti-oxidation coating 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.

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 is any one or several combinations in gold, silver, copper, gold-plated nickel, silver-plated nickel or silver-plated copper; The shape of described conducting particles is any one or several combinations in spherical, sheet, olive-shaped, needle-like; The particle diameter of conducting particles is 0.01 μm ~ 5 μm.

Polymeric adhesive in described conducting resinl is any one or two kinds of combinations in epoxy resin, polyurethane resin, acrylic resin, organic siliconresin.

The quantity of described conductor wire is 10 ~ 500, and the quantity of described insulated wire is 20 ~ 500.

Described electric connection layer is provided with P bus bar electrode and N 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.

Be provided with insulating barrier between described P electrode and N electrode, described insulating layer material is thermoplastic resin or thermosetting resin.

Described resin is any one or several combinations in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin.

A kind of without main grid high efficiency back contact solar cell assembly, comprise the front layer material, encapsulating material, solar cell layer, encapsulating material, the backsheet that connect from top to bottom, described solar cell layer comprises several solar modules, described solar module is solar module described above, and described adjacent solar module is electrically connected by the bus bar electrode of electric connection layer both sides.

The quantity of the cell piece number in the cell piece number comprised without main grid high efficiency back contact solar cell assembly, solar module number, solar module can by following equations; Z represents the total cell piece number of battery component, and Y represents the number of described solar module, and X represents the cell piece number that described solar module comprises, wherein 1≤Y≤X≤Z; X × Y=Z.

The cell piece number of described solar cell layer is 1 ~ 120, and wherein, comprise 4 ~ 120 battery modules, described battery module comprises 1 ~ 15 cell piece.

Solar battery sheet in each solar module is one another in series; Connect successively between solar module, the quantity of the solar battery sheet in each solar module is identical.

Connected by conducting medium between described busbar.

Described conducting medium comprises any one in silver slurry, conducting resinl or scolding tin.

Enforcement of the present utility model comprises following technique effect:

1, the utility model proposes and a kind ofly use technology without main grid braided 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 ICB battery and simplified manufacturing technique flow process.

2, efficiency is high, eliminates the shading loss of front gate line electrode, thus improves battery efficiency;

3, 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 the Components integration that the utility model technology is produced ideally can be avoided splitting because the generation of a slice cell piece is hidden and lose certain electric current and cause the whole electric current renting string the problem of significantly reduction will occur, what propose due to this utility model achieves Mulit-point Connection between electric conductor and cell piece without main grid 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.

6, the utility model 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 due to 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 a slice 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 ideally avoid problems to occur, what propose due to this utility model achieves Mulit-point Connection between electric conductor and cell piece without main grid 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 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 without main grid high efficiency back contact solar cell overall structure with conventional basically identical without main grid high efficiency back contact solar cell, but complete without main grid high efficiency back contact solar cell silver slurry sinter and power stepping test after thermoplasticity or heat cured resin in insulating barrier place silk screen printing 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 bonding effect without main grid high efficiency back contact solar cell sheet and backsheet on the one hand in lamination process.

Accompanying drawing explanation

Fig. 1 point-like is without main grid high efficiency back contact solar cell sheet schematic rear view

Fig. 2 line style is without main grid high efficiency back contact solar cell sheet schematic rear view

Fig. 3 conductor wire sectional view (Fig. 3 a, has materials at two layers conductor wire sectional view, Fig. 3 b, has trilaminate material conductor wire sectional view)

Fig. 4 braiding structure electric connection layer sectional view

Fig. 5 braiding structure electric connection layer schematic diagram

Fig. 6 embodiment 1 and 3 solar module partial schematic diagram

Fig. 7 embodiment 1 and 2 is without main grid high efficiency back contact solar cell module sectional view

Fig. 8 embodiment 1 and 2 is containing the solar module partial section without main grid high efficiency back contact solar cell module

Fig. 9 embodiment 3 is without main grid high efficiency back contact solar cell module sectional view

Figure 10 embodiment 3 is containing the solar module partial section without main grid high efficiency back contact solar cell module

Figure 11 embodiment 2 solar module schematic diagram

Figure 12 embodiment 2 solar cell string partial schematic diagram

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, point-like N electrode; 42, line style N electrode district; 44, line style N electrode; 5, P type doped layer; 51, point-like P electrode; 52, line style P electrode district; 54, line style P electrode; 6, n type single crystal silicon matrix; 7, insulating barrier; 8, front layer material; 81, backsheet; 82, encapsulating material; 9, bus bar electrode; 91, N bus bar electrode; 92, P bus bar electrode; 10, solar cell layer.11, conductor wire; 111, the P conductor wire be connected with P electrode; 112, the N conductor wire be connected with N electrode; 12, insulated wire.

Embodiment;

Embodiment 1

As illustrated in figures 1 and 7, a kind of without main grid high efficiency back contact solar cell module, comprise cell piece and electric connection layer, back contact solar cell module area and cell piece area ratio are 1.05: 1 ~ 100: 1, cell piece comprises n type single crystal silicon matrix 6, n type single crystal silicon matrix 6 back side has the P electrode be connected with P type doped layer 5 and the N electrode be connected with N-type doped layer 4, and insulating barrier 7 place between P electrode and N electrode is provided with thermoplastic resin or thermosetting resin.As shown in Figure 1, be point-like P electrode 51 in P electrode, N electrode is point-like N electrode 41, and point-like P electrode 51 and point-like N electrode 41 are arranged alternately with each other, and total number of point-like P electrode 51 and point-like N electrode 41 is 1000 ~ 40000.The diameter of point-like P electrode 51 is 0.8mm, and the distance between adjacent point-like P electrode 51 is 2-8mm.The diameter of point-like N electrode 41 is 0.7mm, and the distance between adjacent point-like N electrode 41 is 2-8mm, and the centre distance between point-like P electrode 51 line and point-like N electrode 41 line is 1 ~ 9mm.Electrode contact point is soldering tin material.Cell conversion efficiency is 23.56%.Electric connection layer comprises conductor wire 11, insulated wire 12, and conductor wire 11 and insulated wire 12 are by braiding in network structure, and wherein, be woven with insulated wire 12 between adjacent conductive line 11, some conductor wires 11 are electrically connected with P electrode or N electrode respectively.

As shown in Figure 8, a kind ofly comprise the above-mentioned solar module without main grid high efficiency back contact solar cell module, comprise the front layer material 8, solar cell layer 10, the backsheet 81 that connect from top to bottom.The solar cell layer 10 of the present embodiment is a solar module.

Comprise an above-mentioned solar module without main grid high efficiency back contact solar cell module, its preparation method comprises the following steps:

(1) prepare solar cell layer 10: as shown in Figures 4 and 5, be first arranged with 39 insulated wires 12 by between 40 conductor wires 11 arranged in parallel, rear is network structure with arranged in parallel 80 insulated wire 12 interlacings, is prepared into electric connection layer.The diameter of conductor wire 11 and insulated wire 12 is 1.3mm, and length is 596mm.As shown in Figure 6 by first piece without main grid high efficiency back contact solar cell sheet according to back side figure, with electric iron, the point-like N electrode 41 at conductor wire 11 and the cell piece back side or point-like P electrode 51 are welded respectively.

As shown in the 3b figure in Fig. 3, conductor wire 11 is for having the tin metal silk of three-decker, and comprise the steel wire 3 diameter 0.8mm of innermost layer, the layers of copper in intermediate layer, thickness 0.2mm, outermost layer is tin coating, thickness 0.3mm.The cross-sectional area of tin metal silk is circular, and diameter 1.3mm, length is 596mm.

Second piece of cell piece is rotated 180 at horizontal plane align without main grid high efficiency back contact solar cell module edge with above-mentioned, point-like P electrode 51 on second back contact battery sheet is just in time in in the prolongation of the tin metal line that first back contact battery sheet welds with point-like N electrode 41, now these tin metal wire bonds is connected in the point-like P electrode 51 of second back contact battery sheet; Point-like N electrode 41 on second back contact battery sheet 9 is just in time in in the prolongation of the tin metal line that first back contact battery sheet 7 welds with point-like P electrode 51, now these tin metal wire bonds is connected in the point-like P electrode 51 of second back contact battery sheet 9.The like weld the 3rd and the 4th back contact battery sheet successively, formation series-connected cell string structure.According to above-mentioned welding manner, on the downside of first row cascaded structure, weld second to the 4th row's cascaded structure successively, ensure that the level of every block cell piece and vertical edge boundary line align, the 4 string battery strings of having laid.Use the general busbar of routine of 5 × 0.22mm cross-sectional area to be connected by P bus bar electrode 92 by the P conductor wire 111 be connected with point-like P electrode 51 respectively in electric connection layer both sides, the N conductor wire 112 be connected with point-like N electrode 41 is connected by N bus bar electrode 91.Form 4 strings, often go here and there 4, totally 16 solar modules as shown in Figure 6, i.e. solar cell layer 10.The bus bar electrode that the P conductor wire 111 be wherein connected with point-like P electrode 51 is electrically connected is P bus bar electrode 92, and the bus bar electrode that the N conductor wire 112 be connected with point-like N electrode 41 is electrically connected is N bus bar electrode 91.The temperature of welding is 300 ~ 400 DEG C, and heating resistance pad can be used in welding process to cause the fragmentation of cell piece to prevent battery two sides excessive temperature differentials or hiddenly to split in cell piece front, heating pad temperature controls at 40 ~ 80 DEG C.

(2) solar module is prepared, as shown in Figure 8, stacked and visual examination is carried out successively according to the order of front layer material 8, encapsulating material 82, solar cell layer 10, encapsulating material 82 and backsheet 81, described encapsulating material 82 is EVA, module feeding laminating machine after stacked is carried out lamination, laminating parameters sets according to the fluidization characteristic 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 power parameter of above-mentioned 16 back contacts assemblies is as follows:

Open circuit voltage Uoc (V) 22.25

Short circuit current Isc (A) 9.25

Operating voltage μm p (V) 17.27

Operating current Imp (A) 9.08

Maximum power Pmax (W) 156.78

Fill factor, curve factor 76.18%.

Embodiment 2

As illustrated in figures 1 and 7, a kind of without main grid high efficiency back contact solar cell module, comprise cell piece and electric connection layer, back contact solar cell module area and cell piece area ratio are 1.05: 1 ~ 100: 1, cell piece comprises n type single crystal silicon matrix 6, n type single crystal silicon matrix 6 back side has the P electrode be connected with P type doped layer 5 and the N electrode be connected with N-type doped layer 4, and be provided with insulating barrier 7 between P electrode and N electrode, insulating barrier 7 is thermoplastic resin or thermosetting resin.As shown in Figure 1, P electrode is point-like P electrode 51, and N electrode is point-like N electrode 41, and point-like P electrode 51 and point-like N electrode 41 are arranged alternately with each other, and total number of point-like P electrode 51 and point-like N electrode 41 is 1000 ~ 40000.The diameter of point-like P electrode 51 is 0.5mm, and the distance between adjacent point-like P electrode 51 is 1 ~ 2mm.The diameter of point-like N electrode 41 is 0.4mm, and the distance between adjacent point-like N electrode 41 is 1 ~ 2mm, and the centre distance between point-like P electrode 51 line and point-like N electrode 41 line is 0.5 ~ 1mm.Electrode contact point is soldering tin material.Cell conversion efficiency 20.3%.Electric connection layer comprises conductor wire 11, insulated wire 12, and conductor wire 11 and insulated wire 12 are by braiding in network structure, and wherein, be woven with insulated wire 12 between adjacent conductive line 11, some conductor wires 11 are electrically connected with P electrode or N electrode respectively.

As shown in Figure 8, a kind ofly comprise the above-mentioned solar module without main grid high efficiency back contact solar cell module, comprise the front layer material 8, solar cell layer 10, the backsheet 81 that connect from top to bottom.The solar cell layer 10 of the present embodiment comprises multiple solar module.

Comprise an above-mentioned solar module without main grid high efficiency back contact solar cell module, its preparation method comprises the following steps:

(1) solar cell layer 10 is prepared: as shown in Figures 4 and 5, first be arranged with 109 insulated wires 12 by between 110 conductor wires 11 arranged in parallel, be network structure with arranged in parallel 220 insulated wire 12 interlacings afterwards, be prepared into electric connection layer, the diameter of conductor wire 11 and insulated wire 12 is 0.6mm, and length is 154mm.Will without main grid high efficiency back contact solar cell sheet according to back side figure, with electric iron, conductor wire 11 is welded with the point-like N electrode 41 at the cell piece back side or point-like P electrode 51 respectively, use the general busbar of routine of 5 × 0.22mm cross-sectional area to be connected by P bus bar electrode 92 by the P conductor wire 111 be connected with point-like P electrode 51 respectively in electric connection layer both sides, the N conductor wire 112 be connected with point-like N electrode 41 is connected by N bus bar electrode 91, is prepared into solar module as shown in figure 11.As shown in figure 12, the series-connected battery string that the solar module as shown in figure 11 prepared 10 is connected into by bus bar electrode.6 series-connected battery strings are in parallel and prepare solar cell layer 10, form 6 strings, often go here and there 10, the solar module of totally 16, i.e. solar cell layer 10.Finally be in series by the P bus bar electrode 92 of two sections about series-connected battery string, wherein about series-connected battery string, the N bus bar electrode 91 of two sections is in series.

As shown in the 3a figure in Fig. 3, conductor wire 11 is for having the tin metal silk of double-layer structure, and comprising internal layer is layers of copper, diameter 0.25mm, and skin is tin coating, thickness 0.025mm, and tin layers alloying component is tin lead 60/40, namely containing the tin of 60% and the lead of 40%.The cross-sectional area of tin metal silk is circular, diameter 0.28mm.

(2) solar module is prepared, as shown in Figure 8, stacked and visual examination is carried out successively according to the order of front layer material 8, encapsulating material 82, solar cell layer 10, encapsulating material 82 and backsheet 81, described encapsulating material 82 is EVA, module feeding laminating machine after stacked is carried out lamination, laminating parameters sets according to the fluidization characteristic 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 power parameter of above-mentioned 60 back contacts assemblies is as follows:

Open circuit voltage Uoc (V) 40.36

Short circuit current Isc (A) 9.34

Operating voltage μm p (V) 31.78

Operating current Imp (A) 9.25

Maximum power Pmax (W) 293.96

Fill factor, curve factor 77.98%.

Comparative example 1 and 2 can find out that the back contact battery assembly that use is produced without main grid back of the body winding displacement technology can obtain very high fill factor, curve factor, thus improve the generating efficiency of assembly, the size of winding displacement is less simultaneously, namely the more fill factor, curve factors of the quantity of winding displacement are higher, component efficiency is also higher, has good economic benefit.

Embodiment 3

As shown in figs. 2 and 9, a kind of without main grid high efficiency back contact solar cell module, comprise cell piece and electric connection layer, back contact solar cell module area and cell piece area ratio are 1.05: 1 ~ 100: 1, cell piece comprises n type single crystal silicon matrix 6, and its back side has P type doped layer 5 and N-type doped layer 4, and wherein P type doped layer 5 is provided with line style P electrode 54 district, N-type doped layer 4 is provided with line style N electrode 44 district, and line style P electrode 54 district and line style N electrode 44 district are alternately arranged.Line style P electrode 54 sector width is 0.7mm, and the distance between adjacent line style P electrode 54 district 54 is 1 ~ 3mm.Line style N electrode 44 sector width is 0.5mm, and the distance between adjacent line style N electrode 44 district is 1 ~ 3mm, and the centre distance between line style P electrode 54 district and line style N electrode 44 district is 1.5 ~ 3mm.Cell conversion efficiency is 20.5%.Be provided with insulating barrier 7 between line style P electrode 54 district and line style N electrode 44 district, insulating barrier 7 is thermoplastic resin or thermosetting resin.Electric connection layer comprises some conductor wires 11 arranged in parallel, and this some conductor wire 11 is connected electrically in line style P electrode 54 district or line style N electrode 44 district respectively, forms line style P electrode 54 or line style N electrode 44.The conductor wire 11 of the present embodiment is for having the tin metal silk of double-layer structure, and comprising internal layer is layers of copper, diameter 0.5mm, and skin is tin coating, thickness 0.035mm, and the alloying component of tin layers is tin lead 60/40, namely containing the tin of 60% and the lead of 40%.The cross-sectional area of tin metal silk is circular, and diameter is 0.55mm.Electric connection layer comprises conductor wire 11, insulated wire 12, and conductor wire 11 and insulated wire 12 are by braiding in network structure, and wherein, be woven with insulated wire 12 between adjacent conductive line 11, some conductor wires 11 are electrically connected with P electrode or N electrode respectively.

As shown in Figure 10, a kind ofly comprise the above-mentioned solar module without main grid high efficiency back contact solar cell module, comprise the front layer material 8, solar cell layer 10, the backsheet 81 that connect from top to bottom.The solar cell layer 10 of the present embodiment is a solar module.

Comprise an above-mentioned solar module without main grid high efficiency back contact solar cell module, its preparation method comprises the following steps:

(1) solar cell layer 10 is prepared: as shown in Figure 4,5, first be arranged with 34 insulated wires 12 by between 35 conductor wires 11 arranged in parallel, be network structure with arranged in parallel 70 insulated wire 12 interlacings afterwards, be prepared into electric connection layer, the diameter of conductor wire 11 and insulated wire 12 is 0.55mm, and length is 426mm.As shown in Figure 6, by first piece without main grid high efficiency back contact solar cell sheet according to back side figure, second piece of cell piece is rotated 180 ° at horizontal plane align without main grid high efficiency back contact solar cell module edge with above-mentioned, be arranged in order the 3rd piece of cell piece, form series-connected battery string.Use the general busbar of routine of 5 × 0.22mm cross-sectional area to be connected by P bus bar electrode 92 by the P conductor wire 111 be connected with line style P electrode 54 respectively in electric connection layer both sides, the N conductor wire 112 be connected with line style N electrode 44 is connected by N bus bar electrode 91.Form 3 strings as shown in Figure 6, often string 3 pieces of cell pieces, the solar module of totally 9 pieces of cell pieces, i.e. solar cell layer 10.The cross-sectional area of tin metal silk is circular, and diameter is 0.55mm.Arrange 9 pieces of back contact battery sheets and tin metal silk are applied small pressure and heat with hot blast, the tin-lead solder on tin metal silk is made to melt and be connected with the electrode district ohm on back contact battery sheet, line style P electrode 54 district forms line style P electrode 54, line style N electrode 44 district forms line style N electrode 44, final formation cascaded structure as shown in Figure 6, this cascaded structure is a solar module.Hot-blast Heating temperature is 300 ~ 400 degree.

As shown in the 3a figure in Fig. 3, conductor wire 11 is for having the tin metal silk of double-layer structure, and comprising internal layer is layers of copper, diameter 0.5mm, and skin is tin coating, thickness 0.035mm, and the alloying component of tin layers is tin lead 60/40, namely containing the tin of 60% and the lead of 40%.

(2) solar module is prepared, as shown in Figure 10, stacked and visual examination is carried out successively according to the order of front layer material 8, encapsulating material 82, solar cell layer 10, encapsulating material 82 and backsheet 81, described encapsulating material 82 is EVA, module feeding laminating machine after stacked is carried out lamination, laminating parameters sets according to the fluidization characteristic 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 power parameter of above-mentioned 9 back contacts assemblies is as follows:

Open circuit voltage Uoc (V) 6.21

Short circuit current Isc (A) 9.28

Operating voltage μm p (V) 4.89

Operating current Imp (A) 9.06

Maximum power Pmax (W) 44.30

Fill factor, curve factor 76.87%.

From the experiment parameter of embodiment 1-3, the solar module formed without main grid high efficiency back contact solar cell module 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.

Above-mentioned detailed description is the illustrating of possible embodiments for utility model, this embodiment is also not used to limit the scope of the claims of the present utility model, all do not depart from of the present utility model equivalence implement or change, all should be contained in the scope of the claims of the present utility model.

In addition, those skilled in the art also can make various amendments in other form and details, interpolation and replacement in the utility model claim scope of disclosure and spirit.Certainly, the changes such as these various amendments made according to the utility model spirit, interpolation and replacement, all should be included within the utility model scope required for protection.

Claims (10)

1. without main grid high efficiency back contact solar cell module, this solar module comprises cell piece and electric connection layer, the shady face of described cell piece has the P electrode be connected with P type doped layer and the N electrode be connected with N-type doped layer, it is characterized in that: described electric connection layer comprises conductor wire, insulated wire, described conductor wire and insulated wire are network structure by braiding, insulated wire is woven with between adjacent conductive line, some conductor wires are electrically connected with P electrode or N electrode respectively, described back contact solar cell module area and described cell piece area ratio are 1.05: 1 ~ 100: 1.

2. according to claim 1 without main grid high efficiency back contact solar cell module, it is characterized in that: described conductor wire is electrically connected by point-like P electrode or line style P electrode with described P electrode, described conductor wire is electrically connected by point-like N electrode or line style N electrode with described N electrode; The diameter of described point-like P electrode is 0.4mm ~ 1.5mm, and the width of described line style P electrode is 0.4mm ~ 1.5mm, the distance 0.7mm ~ 10mm between two that same conductor wire connects adjacent point-like P electrode or line style P electrode; The diameter of described point-like N electrode is 0.4mm ~ 1.5mm, and the width of described line style N electrode is 0.4mm ~ 1.5mm, and the distance between two that described same conductor wire connects adjacent point-like N electrode or line style N electrode is 0.7mm ~ 10mm.

3. according to claim 2 without main grid high efficiency back contact solar cell module, it is characterized in that: total number of described point-like P electrode and described point-like N electrode is 1000 ~ 40000.

4. according to claim 1 without main grid high efficiency back contact solar cell module, it is characterized in that: the distance between the conductor wire be connected with described N electrode that the conductor wire be connected with described P electrode is adjacent is 0.1mm ~ 30mm; And the distance between the adjacent, parallel arrangement insulated wire of conductor wire vertical woven is 0 ~ 30mm; The quantity of described conductor wire is 10 ~ 500, and the quantity of described insulated wire is 20 ~ 500.

5. according to claim 1 without main grid high efficiency back contact solar cell module, it is characterized in that: the material of described conductor wire is any one or several combinations in copper, aluminium, steel, copper cover aluminum, copper covered steel; The shape of cross section of described conductor wire is any one or several combinations in circular, square, ellipse; The circumscribed circle diameter of described conductor wire shape of cross section is 0.05mm ~ 1.5mm; The material of described insulated wire is any one in resin, plastics, silicon rubber, PVC; The shape of cross section of described insulated wire is any one in circular, square, ellipse; The circumscribed circle diameter of described insulated wire shape of cross section is 0.05mm ~ 1mm.

6. according to claim 1 without main grid high efficiency back contact solar cell module, it is characterized in that: described conductor wire surface is coated with anti-oxidation coating material or is coated with conducting resinl; Described anti-oxidation coating 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; 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 is any one or several combinations in gold, silver, copper, gold-plated nickel, silver-plated nickel or silver-plated copper; The shape of described conducting particles is any one or several combinations in spherical, sheet, olive-shaped, needle-like; The particle diameter of conducting particles is 0.01 μm ~ 5 μm; Polymeric adhesive in described conducting resinl is any one or two kinds of combinations in epoxy resin, polyurethane resin, acrylic resin, organic siliconresin.

7. according to claim 1 without main grid high efficiency back contact solar cell module, it is characterized in that: described electric connection layer is provided with P bus bar electrode and N bus bar electrode, 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; Connected by conducting medium between described busbar.

8. according to claim 1ly it is characterized in that: be provided with insulating barrier 7 between described P electrode and N electrode without main grid high efficiency back contact solar cell module, described insulating layer material is thermoplastic resin or thermosetting resin; Described resin is any one or several combinations in ethylene-vinyl acetate copolymer, vistanex, epoxy resin, polyurethane resin, acrylic resin, organic siliconresin.

9. without main grid high efficiency back contact solar cell assembly, comprise the front layer material, encapsulating material, solar cell layer, encapsulating material, the backsheet that connect from top to bottom, it is characterized in that: described solar cell layer comprises several solar modules, described solar module for described in any one of claim 1-8 without main grid high efficiency back contact solar cell module, described adjacent solar module is electrically connected by the bus bar electrode of electric connection layer both sides.

10. according to claim 9 without main grid high efficiency back contact solar cell assembly, it is characterized in that, the cell piece number of described solar cell layer is 1 ~ 120, wherein, comprise 1 ~ 120 battery module, described battery module comprises 1 ~ 15 cell piece; Solar battery sheet in each described solar module is one another in series; Connect successively between described solar module, the quantity of the solar battery sheet in each described solar module is identical.