CN206516646U - Strengthen the dereliction grid cell piece solar components of welding effect - Google Patents

Abstract

The purpose of this utility model is to provide a kind of based on prior art device, on the premise of modification equipment on a small quantity and technique, the dereliction grid cell piece solar components of reduction production cost and raising generated energy.Including face glass, back glass, EVA layer and welding, also include dereliction grid cell piece, EVA layer is sealed between face glass and back glass, EVA layer inner sealing dereliction grid cell piece, adjacent dereliction grid cell piece is welded to connect by welding, laterally gather thin grid line in the front of dereliction grid cell piece, back side array is provided with backplate, the two ends of the vertical direction of the thin grid line of dereliction grid cell piece are provided with main grid end, without main gate line on thin grid line between main grid end, welding enhancing point is interval with the vertical line of the thin grid line between main grid end.The utility model reduces cost, improves generated energy, the progress in China's solar panel field has been promoted significantly, with good market promotion prospect.

Description

Strengthen the dereliction grid cell piece solar components of welding effect

Technical field

The utility model belongs to field of new energy technologies, more particularly to solar energy, specifically a kind of enhancing welding effect The dereliction grid cell piece solar components of fruit.

Background technology

Global fossil energy crisis has promoted the fast development of photovoltaic industry with environmental pollution.At present, with crystal silicon electricity Component based on the piece of pond occupies more than the 80% of global photovoltaic module market；Crystal-silicon battery slice is developed so far, its cost of manufacture and Generated energy turns into the main restricting factor of its development.In terms of cost of manufacture, silicon materials in occupation of about 60-70% material cost, Material cost of the consumption of silver paste in occupation of about 15-25%；So the cost of high-purity crystal silicon material and its usage amount, Yi Jiyin The usage amount of slurry all has significant effect to the cost of cell piece or component.In terms of generated energy, it is mainly by solar-electricity The influence of the effective illuminating area of pond piece and photoelectric transformation efficiency；The photoelectric transformation efficiency heavy dependence crystal silicon material sheet of cell piece The structure of body, effective illuminating area of cell piece is to depend on cell piece master, the area coverage of thin grid line.

The generating matrix of crystal-silicon battery slice is silicon chip, conventional cell piece be printed on the thin grid line of many bars to collect silicon chip by The electric current produced after to illumination, and 2-5 bars main gate line is also printed on to collect the electric current on thin grid line.In low cost, high generating Under the urgency for measuring this target of cell piece, dereliction grid line cell chip technology arises at the historic moment.Dereliction grid line cell piece, generally referred to as On the basis of conventional batteries piece, remove main gate line and retain thin grid line；This cell piece, on the one hand can be significantly because without main gate line The usage amount of silver paste is reduced, can additionally increase effective illuminating area of cell piece.

On dereliction grid line cell chip technology, there are many methods at present and to enumerate part case as follows.

1. German Schmid removes the main gate line of cell piece without main gate line technology, and width thin grid line and Away from some adjustment have been done, common welding additionally is replaced come Series connection welding polylith cell piece with 15 copper wires.

2. Canadian Day4Electrode patented technologies remove the main gate line of cell piece and retain thin grid line, afterwards It is covered on thin grid, then copper wire and thin grid is welded with the film for being embedded with row plating low-melting-point metal copper wire by laminating technology Come.

3. Lin Jianwei《Without main grid, high efficiency back contact solar module, component and preparation technology》[the patent No.：CN 104282788 A] in mention, the main gate line of cell piece is removed the series connection point of cell piece is positioned over the cell piece back side simultaneously, This method will further improve effective illuminating area of cell piece.

4. it is yellow strong《Photovoltaic battery module and preparation method thereof》[the patent No.：CN104716213A] in mention, battery The main gate line of piece removes and retains thin grid line, while replacing common welding with conductive tape come Series connection welding cell piece.

5. publication No. is authorized in CN201820762U patents, it is proposed that a kind of technical scheme without main gate line completely, Only retain thin grid line.

6. there is provided a kind of skill that main gate line is substituted using some weldings and some conductive tapes in CN103618011A patents Art scheme.

It is right but these prior arts all have ignored an objective fact, that is, existing equipment and known technology Above-mentioned technical proposal can not realize volume production, if using above-mentioned technical proposal, need large area to change production equipment, also, Change or improve crystal silicon battery chip architecture come reduce cell piece cost and improve cell piece generated energy, these methods typically have or Complex process, cost is high, or technique is not yet ripe, it is impossible to obtain for example above-mentioned patent of high volume applications 3..And change photovoltaic module The material of production, will bring substantial amounts of work to adjust, such as matching problem and equipment between the research and development of material, new material Update, 2., 4. this undoubtedly add for example above-mentioned patent of component production cost.For similar to patent 1. without main gate line Battery chip technology, although do not change battery chip architecture and existing component production technology, but pass through our substantial amounts of realities Checking, it is found that the adhesive force between copper wire and thin grid is too small, the electricity at its welding of battery film in the test of TC cycle reliabilities Connection is learned to be deteriorated, and easily there is rosin joint and disconnected grid phenomenon in the welding position at cell piece two ends.Similar to prior art 5. 6., That it changes the whole production technology of existing solar battery sheet, therefore, the possibility of volume production is not had.

Above mentioned problem is attributed to：If 1. not changing the technique of cell piece existing structure and component production, it is necessary to solve The problem that certainly welding comes with thin grid line welded bands, such as welding pulling capacity is too small, problem of faulty soldering easily occurs.If 2. not changing Cell piece existing structure and only change component production technology, then have to find most suitable production technology and related material Material.If 3. not only changed cell piece existing structure and but also change component production technology, then must find most suitable production While technique and associated materials, ensure the stability and generated energy of cell piece again.

For above-mentioned three mentioned problems, different companies has different counter-measures.Such as Germany Schmid Neither change battery chip architecture without main gate line technology nor change component production technology, welded using copper wire with thin grid line； This will bring Railway Project：Automatic string welding machine improvement cost is increased；Copper wire welds unreliable with thin grid（Sent out in our experiment It is existing：Easily occur rosin joint, two ends easily tilt, small part break grid）.Canadian Day4 Electrode patented technologies do not change electricity Pond piece existing structure and only change component production technology；This will bring Railway Project：The film manufacture difficulty for clamping copper wire is increased, copper The welding effect of silk and thin grid is difficult to ensure card very much.The back contact solar component of Lin Jianwei not only changed cell piece existing structure and but also Change component production technology；This will bring Railway Project：The stability and generated energy of cell piece is difficult to ensure that, cell piece series connection material Material quality and cell piece cascading effect are difficult to ensure that.

How on the basis of original component production technology is kept, the front electrode of cell piece is changed on a small quantity, significantly Cell piece and component production cost are reduced, and improves the generated energy of monolithic battery piece.Be current solar battery sheet field urgently The problem of must solving.

The content of the invention

The purpose of this utility model is to provide a kind of based on prior art device, before modification equipment on a small quantity and technique Put, the dereliction grid cell piece solar components of the enhancing welding effect of reduction production cost and raising generated energy.

In order to achieve the above object, the technical solution adopted in the utility model is：It is a kind of strengthen welding effect without main grid Cell piece solar components, including face glass, back glass, EVA layer and welding, in addition to dereliction grid cell piece, front glass It is sealed with EVA layer between glass and back glass, EVA layer inner sealing dereliction grid cell piece, welding is by adjacent dereliction grid cell piece It is welded to connect, the horizontal thin grid line that gathers in the front of dereliction grid cell piece, back side array is provided with backplate, dereliction grid cell piece The two ends of the vertical direction of thin grid line are provided with the thin grid line between main grid end, main grid end without main gate line, main grid Welding enhancing point is interval with the vertical line of thin grid line between end.

Connection between dereliction grid cell piece is welding welding, the covering join domain of welding for a pair of main grid ends with And the thin grid line between this pair of main grid end and welding enhancing point.

Welding connects adjacent dereliction grid cell piece, and its one end connects the front electrode of dereliction grid cell piece, other end connection The backplate of another dereliction grid cell piece.

Main grid end length is 2-20mm, and width is 0.2-1.2mm, and the quantity of main grid end 2 is 2-6 pairs.

Main gate line tip shapes include rectangle, ellipse, triangle, circle, trapezoidal and irregular strip.

Main grid end is high-purity silver paste or silver-colored aluminum slurry.

Welding includes rectangular cross-section shape welding, circular welding and oval welding.

The size of rectangle welding is：Width 0.3-1.5mm, thickness 0.1-0.25mm；The size of toroidal welding is：Diameter D=0.2-0.5mm；Ellipticity welding size is：Major axis a=0.15-0.75mm, short axle b=0.05-0.125mm.

Most preferably 5-15 millimeters of the width of welding enhancing point, most preferably 5-30 millimeters of height.

The quantity of main grid end is 2-6 pairs.Generally, conventional cell piece includes the main gate line of different bar numbers, for example There are two main grid cell pieces, three main gate line cell pieces, four main gate line cell pieces, five main gate line cell pieces even a plurality of masters Grid line cell piece.Different bar number main gate lines can produce influence to some aspects of cell piece, and such as two main gate line cell pieces may Cell piece cost can be reduced but its electric current collection ability is reduced, five main gate lines increase its electric current collection ability but increasing Big silver paste usage amount and reduce effective illuminating area.

Although this utility model does not have main gate line, the cell piece need to coordinate welding to use, the termination that main gate line retains Number influences still to exist on it.Have verified that the cell piece can coordinate thinner thinner welding to be used by testing us, So shading-area problem we can be with control in place.For retaining two or three pairs of main grid ends, it can further be reduced Silver paste usage amount, further increases the effective shading-area of silicon chip.For retaining five pairs or six pairs of main grid ends, it can ensure While existing generated energy, further lifting welding collects the ability of electric current in silicon chip.And for the utility model, it is believed that Most preferably 4 pairs of the termination number that main gate line retains.

Main gate line tip shapes include rectangle, ellipse, triangle, circle, trapezoidal and irregular strip etc..

The shape of main grid end is on the premise of connection effect is ensured, shape is not fully fixed, people in the art The shape that member is readily conceivable that all should be in the range of the utility model.

Crystal silicon solar batteries piece it is main by：Light is converted into the conductive material of electric high-purity crystal silicon material, collected current Including positive main gate line, the silver electrode of thin grid line and the back side, aluminium backboard, the key point of this patent removes the big portion of cell piece Point main gate line and the fraction for retaining its two ends, set up welding enhancing point.Calculated according to current cell piece material cost, silicon material Material accounts for 60-70%, and silver-colored consumption accounts for 15-25%；And silver usage amount in terms of on, the silver amount of front electrode is relatively good, the back of the body Face electrode quality is not as front, and generally positive is high-purity silver paste, the silver-aluminum slurry at the back side, we this Kind of design can be reduced silver-colored 70-75% used in crystal-silicon battery slice front electrode.

Generated energy is primarily to see cell piece or solar panel i.e. the power output P of the concatermer of polylith cell piece.It is logical Often, when the material of each structure of cell piece is determined, its generated energy power output P depends primarily on effective light Show up long-pending S, and the silicon materials in generating state are more, and its generated energy is necessarily bigger；And this patent use is proper without main gate line technology It is reduced well and covers the area of silicon materials, then coordinates thinner welding, can increase the power output of solar panel about Increase 1-2% or so.Illustrated with more intuitive data, calculated by 10 megawatts of photovoltaic plant of generated energy, material can be saved Nearly 230-380 ten thousand yuans of cost.In addition, in terms of generated energy, the removal of main gate line and the use for coordinating special welding, It can increase 1%-the 2% of generating efficiency；Illustrated with more intuitive data, calculated by 10 megawatts of photovoltaic plant of generated energy, year Generated energy can at least increase by 30-60 megawatts.

According to the related experiment carried out as foundation, the other performance of this cell piece reaches the equal water of prior art It is flat.

Solar energy crystal-silicon battery slice described in the utility model for component when manufacturing, by the way of Series connection welding Polylith cell piece is connected to one piece, such a mode does not change existing component production technology, substantially reduces component production cost.

The thin grid line of solar energy crystal-silicon battery slice described in the utility model, is to be used to collect crystal silicon material by production after illumination Raw electric current.And the welding being welded on thin grid line then plays a part of collecting electric current on thin grid line.Also, main gate line two ends Member-retaining portion is used to strengthen welding effect, enhancing welding pulling force.

The connected mode of polylith cell piece, which remains unchanged, uses Series connection welding, without changing welding material and need not change component Production technology and equipment.

The utility model reduces cost, improves generated energy, has for whole solar cell board industry and instructs to anticipate Justice, has promoted the progress in China's solar panel field significantly, with good market promotion prospect.

Brief description of the drawings

Fig. 1 the utility model overall structure schematic cross-sections；

Fig. 2 the utility model dereliction grid cell piece front schematic views；

Fig. 3 the utility model dereliction grid cell piece schematic rear views；

Fig. 4 the utility model dereliction grid cell pieces are without welding side schematic view；

Fig. 5 the utility model main grid end mplifying structure schematic diagrams；

Fig. 6 the utility model main grid end mplifying structure schematic diagrams；

Fig. 7 the utility model main grid end mplifying structure schematic diagrams；

Fig. 8 the utility model main grid end mplifying structure schematic diagrams；

Fig. 9 the utility model main grid end mplifying structure schematic diagrams；

Rectangle welding structural representation used in Figure 10 the utility model；

Circular welding structural representation used in Figure 11 the utility model；

Oval welding structural representation used in Figure 12 the utility model；

Figure 13 the utility model welding enhancing point mplifying structure schematic diagram；

Figure 14 the utility model welding enhancing point mplifying structure schematic diagram；

Figure 15 the utility model welding enhancing point mplifying structure schematic diagram；

Figure 16 the utility model welding enhancing point mplifying structure schematic diagram；

In figure：1 cell piece；2 main grid ends；3 thin grid lines；4 backplates；5 face glass；6 back glass；7 weldings； 8EVA layers；9 welding enhancing points；701 rectangle weldings；702 circular weldings；703 oval weldings.

Embodiment

The utility model is further described below in conjunction with the accompanying drawings.

It is a kind of to strengthen the dereliction grid cell piece solar components of welding effect, including face glass 5, back glass 6, EVA Layer 8 and welding 7, in addition to dereliction grid cell piece 1, are sealed between face glass 5 and back glass 6 in EVA layer 8, EVA layer 8 Portion's sealing dereliction grid cell piece 1, adjacent dereliction grid cell piece 1 is welded to connect by welding 7, and the front of dereliction grid cell piece 1 is laterally Gather thin grid line 3, and back side array is provided with backplate 4, the two ends of the vertical direction of the thin grid line 3 of dereliction grid cell piece 1 and set Have on the thin grid line 3 between main grid end 2, main grid end 2 without main gate line, the thin grid line between main grid end 2 hangs down Welding enhancing point 9 is interval with line.

Connection between dereliction grid cell piece 1 is welded for welding, and the covering join domain of welding 7 is a pair of main grid ends And the thin grid line between this pair of main grid end and welding enhancing point 9.

Welding 7 connects adjacent dereliction grid cell piece 1, and the front electrode of its one end connection dereliction grid cell piece 1, the other end connects Connect the backplate of another dereliction grid cell piece 1.

The length of main grid end 2 is 2-20mm, and width is 0.2-1.2mm, and the quantity of main grid end 2 is 2-6 pairs.

The shape of main grid end 2 includes rectangle, ellipse, triangle, circle, trapezoidal and irregular strip.

Main grid end 2 is high-purity silver paste or silver-colored aluminum slurry.

Welding 7 includes rectangle welding, circular welding and oval welding.

The size of rectangle welding 7 is：Width 0.3-1.5mm, thickness 0.1-0.25mm；The size of toroidal welding 7 is：Directly Footpath D=0.2-0.5mm；The size of ellipticity welding 7 is：Major axis a=0.15-0.75mm, short axle b=0.05-0.125mm.

Most preferably 2-10 millimeters of the length of welding enhancing point, most preferably 0.2-1.2 millimeters of width.

The quantity of main grid end 2 is 2-6 pairs.Generally, conventional cell piece includes the main gate line of different bar numbers, for example There are two main grid cell pieces, three main gate line cell pieces, four main gate line cell pieces, five main gate line cell pieces even a plurality of masters Grid line cell piece.Different bar number main gate lines can produce influence to some aspects of cell piece, and such as two main gate line cell pieces may Cell piece cost can be reduced but its electric current collection ability is reduced, five main gate lines increase its electric current collection ability but increasing Big silver paste usage amount and reduce effective illuminating area.

Although the crystal-silicon battery slice described in this utility model does not have main gate line, the cell piece need to coordinate welding to make With the termination number that main gate line retains influences still to exist on it.By testing us, to have verified that the cell piece can coordinate thinner Thinner welding.

Existing cell piece manufacture craft is：Crystalline silicon substrate-surface wool manufacturing-diffuses to form PN junction-surface coated with antireflection and applied Layer-print electrode.

Wherein crystalline silicon substrate is high-purity polysilicon or monocrystalline silicon（Purity reaches more than 6N, i.e., 99.9999%）；

Silicon chip surface making herbs into wool refers to that carrying out corrosion in silicon chip surface forms scraggly shape, to increase silicon chip to the sun The capture rate of light；

Diffuse to form PN junction to refer to carry out silicon chip phosphorus or boron doping so that cell piece both sides form P-type silicon and N-type respectively Silicon；Silicon chip surface coated with antireflection film refers to deposit one layer of silicon nitride film in silicon chip surface, to reduce the reflectivity of sunshine；

The finger that prints electrode includes printing aluminium back surface field, backplate, thin grid line and main gate line respectively to silicon chip both sides.

The cell piece of prior art is the electricity that main gate line is deployed, thin grid line is deployed, backplate is deployed Pond piece, then into component production process process, the welding between two panels cell piece or multi-disc cell piece is welded using welding Connect, then add EVA sealants, finally enter the assembling procedure of solar double-glass assemblies.

The utility model in specific implementation process, cell piece for thin grid line is deployed, main gate line tip placement is finished, Welding enhancing point is deployed, the cell piece that backplate is deployed, and main gate line is dispensed, produced then into component Thin grid line is electrically connected by process, welding welding, welding, reaches current collection function, then adds EVA sealants, most laggard Enter the assembling procedure of solar double-glass assemblies.

Packaging process of the present utility model：The technological process of this solar double-glass assemblies is as follows：Cell piece screening-cell piece series connection Welding-stacking-lamination-cleaning deburring-installation terminal box-colloid solidifies-cleans deburring.

In this component the connected mode of cell piece use Series connection welding as shown in figure 1, the welding of special requirement with without main grid Line cell piece, which coordinates, completes welding.One end of the welding of certain length first is layed in the front of a cell piece, in the work of external force Under, welding keeps being physically contacted with main gate line member-retaining portion, thin grid line, then carries out heating to welding and cell piece so as to complete Welded into cell piece front.Then the back side of another cell piece is covered on foregoing welding, by heating so as to complete Into the welding of the cell piece back side.The Series connection welding for just completing cell piece several times so repeated.

Shown in the overlapped way of this component, two layers of EVA is multi-string battery piece to wrapping up, and two blocks of glass are arranged in respectively Two layers of EVA outermost.And cause EVA to produce crosslinking in laminating technology, cell piece is wrapped up and two are bonding to Block glass.

Certainly, the above is only preferred embodiment of the present utility model, it is impossible to be considered as being used to limit to utility model Scope of embodiments.The utility model is also not limited to the example above, and those skilled in the art are in this practicality The equivalent change made in new essential scope and improvement etc., all should belong to the utility model patent covering scope.

Claims (10)

1. a kind of strengthen the dereliction grid cell piece solar components of welding effect, including face glass（5）, back glass（6）、 EVA layer（8）And welding（7）, it is characterised in that：Also include dereliction grid cell piece（1）, face glass（5）And back glass（6）It Between be sealed with EVA layer（8）, EVA layer（8）Inner sealing dereliction grid cell piece（1）, welding（7）By adjacent dereliction grid cell piece（1） It is welded to connect, dereliction grid cell piece（1）Front laterally gather thin grid line（3）, back side array is provided with backplate（4）, dereliction Grid cell piece（1）Thin grid line（3）Vertical direction two ends be provided with main grid end（2）, main grid end（2）Between Thin grid line（3）On without main gate line, main grid end（2）Between thin grid line vertical line on be interval with welding enhancing point（9）.

2. the dereliction grid cell piece solar components of enhancing welding effect according to claim 1, it is characterised in that：Dereliction Grid cell piece（1）Between connection be welding welding, welding（7）Covering join domain be a pair of main grid ends and this pair Thin grid line and welding enhancing point between main grid end（9）.

3. the dereliction grid cell piece solar components of enhancing welding effect according to claim 2, it is characterised in that：Welding （7）Connect adjacent dereliction grid cell piece（1）, its one end connection dereliction grid cell piece（1）Front electrode, the other end connection it is another Piece dereliction grid cell piece（1）Backplate.

4. the dereliction grid cell piece solar components of enhancing welding effect according to claim 1, it is characterised in that：Main grid End（2）Length is 2-20mm, and width is 0.2-1.2mm, main grid end（2）Quantity be 2-6 pairs.

5. the dereliction grid cell piece solar components of enhancing welding effect according to claim 1, it is characterised in that：Main grid End（2）Shape includes rectangle, ellipse, triangle, circle, trapezoidal and irregular strip.

6. the dereliction grid cell piece solar components of enhancing welding effect according to claim 1, it is characterised in that：Main grid End（2）For high-purity silver paste or silver-colored aluminum slurry.

7. the dereliction grid cell piece solar components of enhancing welding effect according to claim 1, it is characterised in that：Welding （7）Including rectangle welding, circular welding and oval welding.

8. the dereliction grid cell piece solar components of enhancing welding effect according to claim 7, it is characterised in that：Rectangle Welding（7）Size be：Width 0.3-1.5mm, thickness 0.1-0.25mm；The size of toroidal welding 7 is：Diameter D=0.2- 0.5mm；The size of ellipticity welding 7 is：Major axis a=0.15-0.75mm, short axle b=0.05-0.125mm.

9. the dereliction grid cell piece solar components of enhancing welding effect according to claim 1, it is characterised in that：Dereliction Welding enhancing point in grid cell piece（9）Width be 2-10 millimeters, be highly 0.2-1.2 millimeters.

10. the dereliction grid cell piece solar components of enhancing welding effect according to claim 1, it is characterised in that：Nothing Welding enhancing point in main grid cell piece between each pair main grid end（9）Number most preferably 1-5.