CN102299203B - Solar energy cell and solar energy cell right side electrode design method - Google Patents
Solar energy cell and solar energy cell right side electrode design method Download PDFInfo
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- CN102299203B CN102299203B CN2011102478368A CN201110247836A CN102299203B CN 102299203 B CN102299203 B CN 102299203B CN 2011102478368 A CN2011102478368 A CN 2011102478368A CN 201110247836 A CN201110247836 A CN 201110247836A CN 102299203 B CN102299203 B CN 102299203B
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- 238000013461 design Methods 0.000 title claims abstract description 23
- 238000000034 method Methods 0.000 title claims abstract description 20
- BQCADISMDOOEFD-UHFFFAOYSA-N Silver Chemical compound [Ag] BQCADISMDOOEFD-UHFFFAOYSA-N 0.000 abstract description 11
- 238000003466 welding Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 11
- 238000005245 sintering Methods 0.000 description 9
- 229910052751 metal Inorganic materials 0.000 description 7
- 239000002184 metal Substances 0.000 description 7
- 229910052709 silver Inorganic materials 0.000 description 7
- 239000004332 silver Substances 0.000 description 7
- 239000002002 slurry Substances 0.000 description 7
- 238000007639 printing Methods 0.000 description 5
- 238000007650 screen-printing Methods 0.000 description 5
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 4
- 229910052710 silicon Inorganic materials 0.000 description 4
- 239000010703 silicon Substances 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 239000006185 dispersion Substances 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 238000013467 fragmentation Methods 0.000 description 3
- 238000006062 fragmentation reaction Methods 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 229910000676 Si alloy Inorganic materials 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 239000007772 electrode material Substances 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
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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
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Abstract
The invention discloses a solar energy cell which is characterized in that the cell comprises a back electrode and a right side electrode, wherein the right side electrode is printed with a grid structure with a nested full auxiliary grid design. The grid structure concretely comprises the following parts: fine grid structures which are formed by a quadrilateral annular, wherein the quadrilateral annular is formed by a fine grid line; densely auxiliary grid structures which are formed by a plurality of nested fine grid structures layer by layer; full auxiliary grid structures which are composed of at least two sets of adjacent densely auxiliary grid structures. The invention also discloses a solar energy cell right side electrode design method. According to the full auxiliary grid design of the grid structure on the right side electrode of the solar energy cell, a poor welding problem caused by height difference between a traditional main grid and an auxiliary grid is solved, simultaneously application amount of conductive silver paste is saved and cost is saved.
Description
Technical field
The present invention relates to the grid structure design of the front electrode printing in the solar cell, more specifically, the present invention relates to the full grid positive electrode design method of a kind of solar cell and solar cell nested type.
Background technology
In the day by day serious situation of current energy crisis, the solar cell industry is subject to paying close attention to greatly and pursuing, and constantly has large-scale solar breeder setting up all over the world.When pursuing high transformation efficiency, one of key point that has also become each producer's raising self competitiveness reduces the cost.
Because metal has good conductive characteristic, therefore extensively be used as electrode material, the especially argent of solar cell.The concrete preparation method of electrode utilizes screen printing technique that metal paste is printed onto silicon chip surface by certain printed patterns, then carries out high temperature sintering, so that form good silver-colored silicon alloy and good ohmic contact between metal and the silicon chip.
Traditional front electrode of solar battery is comprised of main grid and secondary grid at present, and wherein the metal paste of main grid (being generally silver paste) consumption accounts for 50% of front electrode metal slurry consumption.And the use amount that how to reduce metal paste in the solar cell printing process becomes one of Main Means that reduces cost, so letter a kind of brand-new front electrode design to be supplied.The invention provides the full grid front electrode design of a kind of solar cell and solar cell nested type, can effectively reduce the solar cell conductive paste use amount.
Summary of the invention
In order effectively to reduce the use amount of electrocondution slurry (normally silver paste) in the printing of solar energy front electrode, the present invention proposes a kind ofly to utilize successively in the design of described grid structure that nested secondary grid replace original main grid, thereby forms a kind of solar cell and front electrode of solar battery method for designing.
According to an aspect of the present invention, a kind of solar cell is provided, it comprises back electrode and front electrode, wherein be printed with the grid structure that possesses the full grid design of nested type at front electrode, described grid structure specifically comprises: thin grid structure, described thin grid structure is made of four side ring shapes, and described four side ring shapes are made of thin grid line; Intensive secondary grid structure, described intensive secondary grid structure by several successively nested described thin grid structure consist of; Full grid structure, described full grid structure is made of the adjacent described intensive secondary grid structure of at least two groups.
According to a preferred embodiment of the present invention, in the wherein said solar cell, the spacing of the vertically thin grid line of the innermost layer of described intensive secondary grid structure and the vertically thin grid line of outermost layer is between 10um-12um.
According to a preferred embodiment of the present invention, in the wherein said solar cell, spacing is 2.30-2.80mm between the laterally thin grid line line in the described intensive secondary grid structure, and is evenly distributed in battery surface.
According to another preferred embodiment of the present invention, in the wherein said solar cell, the thin grid line that described intensive secondary grid structure comprises is the 20-80 bar.
According to a further preferred embodiment of the invention, in the wherein said solar cell, described thin grid line can be linear structure or curvilinear structures.
According to another aspect of the present invention, a kind of front electrode of solar battery method for designing is provided, described solar cell comprises back electrode and front electrode, be printed with the full grid structure of nested type on the described front electrode, the method may further comprise the steps: the step that forms thin grid structure, described thin grid structure is made of four side ring shapes, and described four side ring shapes are made of thin grid line; Form the step of described intensive secondary grid structure, described intensive secondary grid structure by several successively nested thin grid structure consist of; Form the step of described full grid structure, described full grid structure is made of the adjacent intensive secondary grid structure of at least two groups.
Advantage of the present invention is:
1, the grid structure that prints on the described front electrode is comprised of full grid, and traditional main grid part is replaced by the intensive secondary grid that four successively nested side ring shapes form.Can effectively solve the failure welding problem that causes owing to difference in height between traditional main grid and the secondary grid;
2, described intensive secondary grid are comprised of four side ring shapes, the stress that rationally the organic substance volatilization produces in the Uniform Dispersion sintering process, thus improve the fragmentation rate of cell piece bending and terminal assembly welding;
3, in the situation that does not affect electrical property, test accuracy and welding performance, can effectively reduce the conductive silver slurry use amount, and then reduce cost.
Description of drawings
By reading the detailed description that non-limiting example is done of doing with reference to the following drawings, it is more obvious that other features, objects and advantages of the present invention will become:
Fig. 1 is traditional solar battery structure schematic diagram and the schematic diagram of the grid structure on described front electrode of solar battery.Wherein, Fig. 1 a shows traditional solar battery structure schematic diagram, and Fig. 1 b shows the schematic diagram of the grid structure on the front electrode of described solar cell.
Fig. 2 is a kind of according to an embodiment of the invention vertical view of front electrode of solar battery design.
Fig. 3 is the adjacent cells intersection intensive secondary grid figure that forms of nested thin grid structure successively in the design of a kind of according to an embodiment of the invention front electrode of solar battery.
Fig. 4 is the detailed schematic that full grid replace traditional main grid in the according to an embodiment of the invention front electrode of solar battery design.
Same or analogous Reference numeral represents same or analogous parts in the accompanying drawing.
Embodiment
1-4 is described in further detail the present invention below with reference to accompanying drawings.
Fig. 1 is traditional solar battery structure schematic diagram and the schematic diagram of the grid structure on described front electrode of solar battery.As shown in Figure 1, Fig. 1 a shows traditional solar battery structure schematic diagram, and Fig. 1 b shows the schematic diagram of the grid structure on the front electrode of described solar cell.Wherein, in Fig. 1 a, we can find out, include successively from the bottom up metal level 112, backplate layer 110, N-type layer 108 in traditional solar cell, intrinsic layer 106, P type layer 104 and front electrode layer 102, and be printed with grid structure at front electrode layer 102, described grid structure is shown in Fig. 1 b; Be the schematic diagram of the grid structure that prints of traditional front electrode of solar battery in Fig. 1 b, described grid structure comprises main grid line 1 and the thin grid line 2 vertical with main grid line 1, and thin grid line is evenly distributed on battery surface, forms secondary grid structure.This printing form adapts to existing silk screen printing and sintering process fully.As seen, main grid structure and secondary grid structure are to distinguish independent design in traditional grid structure.
Fig. 2 is a kind of according to an embodiment of the invention vertical view of front electrode of solar battery design.As shown in Figure 2,201 is full grid structure among the figure, 202 is thin grid structure, described thin grid structure 202 is made of several four side rings shapes, described four side ring shapes are made of thin grid line, and by several successively nested thin grid structure consist of traditional secondary grid structure, and described full grid structure 201 is made of two groups of intensive secondary grid structures, the spacing of the vertically thin grid line of the innermost layer of wherein said intensive secondary grid structure and the vertically thin grid line of outermost layer is between 10um-12um, to guarantee not affect the accuracy of cell slice test, the described direction that vertically is often referred to the traditional main grid structure in traditional front electrode.And spacing is 2.30-2.80mm between the laterally thin grid line line in the described intensive secondary grid structure, and is evenly distributed in described front electrode surface, the described direction that laterally typically refers to perpendicular to the traditional main grid structure in traditional front electrode.Described thin grid line can be linear structure or curvilinear structures, and thin grid line number is the 20-80 bar, is preferably 50.
In the main grid and secondary grid structure of traditional electrode, the main grid line mainly is to compile next electric current for collecting from thin grid line, normally two, but according to cell area, collection efficiency with become to produce cost, also can make three grid lines, the present invention is illustrated namely to be three grid line structures, and just the present invention utilizes full grid structure to replace traditional main grid structure, and wherein said intensive secondary grid structure is made of the successively nested thin grid structure that is comprised of several four side rings shapes.
In front electrode of solar battery shown in Figure 2, contain electrocondution slurry in traditional main grid structure, and electrocondution slurry accounts for 50% of front side silver paste printing total amount, in specific embodiment, electrocondution slurry is silver paste normally, and the electric conductivity of silver paste is better.And full grid front electrode of the present invention is owing to utilize full grid to replace traditional main grid structure, the use amount of therefore greatly having saved electrocondution slurry, in addition, in specific embodiment, described secondary grid structure normally makes by operations such as silk screen printing, oven dry, Fast Sintering heat treatments, and the organic substance in oven dry and Fast Sintering process electrocondution slurry is removed.Simultaneously, secondary grid structure is comprised of four side ring shapes, and rationally organic substance can be sent out the stress of generation in the Uniform Dispersion sintering process, thereby improves the fragmentation rate of cell piece bending and terminal assembly welding.
Fig. 3 is the adjacent cells intersection intensive secondary grid figure that forms of nested thin grid structure successively in the design of a kind of according to an embodiment of the invention front electrode of solar battery.As shown in Figure 3, full grid structure successively is nested to form on a limit of four nested side ring shapes one by one by several that form thin grid structure, like this so that full grid structure is the thickest in the middle of presenting, toward above-below direction (illustrated above-below direction, also be the direction of traditional main grid) structure of attenuation gradually, realized the structure identical with traditional main grid, owing to removed in fact the structure of traditional main grid, therefore effectively solved the failure welding problem that causes owing to difference in height between traditional main grid and the secondary grid simultaneously.
The successively secondary grid structure of nested thin grid line composition has been shown in the diagram, and thin grid line is generally used for compiling electric current, therefore usually also utilize silver paste to make by operations such as silk screen printing, oven dry, Fast Sintering heat treatments, can guarantee preferably electric conductivity like this, and simultaneously, the full grid structure that two groups of intensive secondary grid that utilization successively is nested to form consist of has also been compiled the electric current from thin grid line, has therefore realized the technique effect identical with traditional main grid structure.In addition, because traditional main grid line and the normally vertical setting of secondary grid line, therefore the structure of described four side ring shapes has also satisfied this vertically disposed needs, certainly, according to the needs of different electrode design, the thin grid structure described in also can figure is set to other geometries.
Fig. 4 is the detailed schematic that full grid replace traditional main grid in a kind of according to an embodiment of the invention front electrode of solar battery design.As shown in Figure 4, what show among the figure is the schematic diagram of wide part of full grid structure, as seen, the main grid structure that is comprised of a plurality of limits that form four side ring shapes of thin grid structure is in fact the combination on above-mentioned limit, the main grid structure of having forgone traditional, but all utilize secondary grid structure to replace, simultaneously because traditional main grid is identical with the manufacture craft of secondary grid structure, as usually all adopting silver paste by silk screen printing, oven dry, the operations such as Fast Sintering heat treatment make, therefore, this full grid structure can realize the technique effect that traditional main grid reaches fully, simultaneously, because secondary grid are comprised of thin grid structure, simultaneously thin grid structure is four side ring shape structures, this is so that there is certain distance at full grid the widest part and cell piece edge, and this distance is release stress distance, and this design has reached the effect of effective release stress, and has obtained good result in experiment with in producing, solve the thinner frangible problem of present solar battery sheet, adapted to the development need of industry.
In structure chart shown in Figure 4, the thin grid line that forms the thin grid line of secondary grid and form in the intensive secondary grid of full grid structure is linear structure, certainly, also can adopt curvilinear structures, also preferred selection is symmetrical usually when adopting curvilinear structures, being more easily to compiling electric current like this, is to have increased the length of grid line on silicon chip and adopt the advantage of curvilinear structures, and the electric charge that produces on the silicon chip is collected the utilance height.
As seen, the present invention not only replaces traditional main grid by the intensive secondary grid structure that four side ring shapes form, thereby realize the stress problem that the organic substance volatilization produces in the reasonable Uniform Dispersion sintering process, thereby improve the fragmentation rate problem of cell piece bending and terminal assembly welding; Design without the full grid front electrode of main grid in fact by design simultaneously, effectively reduce the use amount of conductive silver slurry, and then effectively reduced production cost; In addition, owing to be whole secondary grid designs, there is not the failure welding problem between traditional main grid and the secondary grid yet.
To those skilled in the art, obviously the invention is not restricted to the details of above-mentioned example embodiment, and in the situation that does not deviate from spirit of the present invention or essential characteristic, can realize the present invention with other concrete form.Therefore, no matter from which point, all should regard embodiment as exemplary, and be nonrestrictive, scope of the present invention is limited by claims rather than above-mentioned explanation, therefore is intended to be included in the present invention dropping on the implication that is equal to important document of claim and all changes in the scope.Any Reference numeral in the claim should be considered as limit related claim.In addition, obviously miscellaneous part, unit or step do not got rid of in " comprising " word, and odd number is not got rid of plural number.A plurality of parts of stating in system's claim, unit or device also can be realized by software or hardware by parts, unit or device.
Claims (6)
1. front electrode of solar battery method for designing, described solar cell comprises back electrode and front electrode, is printed with the full grid structure of nested type on the described front electrode, the method may further comprise the steps:
Form the step of thin grid structure, described thin grid structure is made of four side ring shapes, and described four side ring shapes are made of thin grid line;
Form the step of intensive secondary grid structure, described intensive secondary grid structure by several successively nested thin grid structure consist of;
Form the step of described full grid structure, described full grid structure is made of the adjacent intensive secondary grid structure of at least two groups;
The spacing of the vertically thin grid line of the innermost layer of described intensive secondary grid structure and the vertically thin grid line of outermost layer is between 10um ~ 12um;
Spacing is 2.30 ~ 2.80mm between the laterally thin grid line line in the described intensive secondary grid structure, and is evenly distributed in described front electrode surface.
2. front electrode of solar battery method for designing as claimed in claim 1, the thin grid line that wherein said intensive secondary grid structure comprises is the 20-80 bar.
3. front electrode of solar battery method for designing as claimed in claim 1, wherein said thin grid line is linear structure or curvilinear structures.
4. solar cell, it comprises back electrode and front electrode, wherein is printed with the grid structure that possesses the full grid design of nested type at front electrode, described grid structure specifically comprises:
Thin grid structure, described thin grid structure is made of four side ring shapes, and described four side ring shapes are made of thin grid line;
Intensive secondary grid structure, described intensive secondary grid structure by several successively nested described thin grid structure consist of;
Full grid structure, described full grid structure is made of the adjacent described intensive secondary grid structure of at least two groups;
The spacing of the vertically thin grid line of the innermost layer of described intensive secondary grid structure and the vertically thin grid line of outermost layer is between 10um ~ 12um;
Spacing is 2.30 ~ 2.80mm between the laterally thin grid line line in the described intensive secondary grid structure, and is evenly distributed in battery surface.
5. solar cell as claimed in claim 4, the thin grid line that wherein said intensive secondary grid structure comprises is the 20-80 bar.
6. solar cell as claimed in claim 4, wherein said thin grid line is linear structure or curvilinear structures.
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| CN102582220B (en) * | 2012-02-29 | 2013-09-04 | 苏州欧方电子科技有限公司 | Method for manufacturing anode screen plate for improving solar cell silicon sheet conversion rate |
| CN102709339B (en) * | 2012-05-25 | 2015-05-20 | 嘉兴优太太阳能有限公司 | Solar cell structure of improved electrode pattern |
| CN110634967B (en) * | 2018-06-21 | 2021-08-10 | 德运创鑫(北京)科技有限公司 | Front electrode of heterojunction battery and manufacturing method thereof |
| CN114695574A (en) * | 2022-04-27 | 2022-07-01 | 浙江爱康光电科技有限公司 | Heterojunction battery piece without main grid |
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| JP2001068699A (en) * | 1999-08-30 | 2001-03-16 | Kyocera Corp | Solar cell |
| US20090255565A1 (en) * | 2008-01-31 | 2009-10-15 | Global Solar Energy, Inc. | Thin film solar cell string |
| US20110023952A1 (en) * | 2009-07-30 | 2011-02-03 | Evergreen Solar, Inc. | Photovoltaic cell with semiconductor fingers |
| CN101826569A (en) * | 2010-05-13 | 2010-09-08 | 无锡尚德太阳能电力有限公司 | Solar cell, screen printing plate and solar cell module thereof |
| CN202076274U (en) * | 2011-06-01 | 2011-12-14 | 上海超日太阳能科技股份有限公司 | Four-'hui' type positive electrode structure for solar battery |
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Address after: 314417 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province Patentee after: Zhengtai Xinneng Technology Co.,Ltd. Address before: 314417 No. 1 Jisheng Road, Jiaxing City, Zhejiang Province Patentee before: Zhengtai Xinneng Technology Co.,Ltd. |